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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [remote.c] - Rev 855
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/* Remote target communications for serial-line targets in custom GDB protocol Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* See the GDB User Guide for details of the GDB remote protocol. */ #include "defs.h" #include "gdb_string.h" #include <ctype.h> #include <fcntl.h> #include "inferior.h" #include "bfd.h" #include "symfile.h" #include "exceptions.h" #include "target.h" /*#include "terminal.h" */ #include "gdbcmd.h" #include "objfiles.h" #include "gdb-stabs.h" #include "gdbthread.h" #include "remote.h" #include "regcache.h" #include "value.h" #include "gdb_assert.h" #include "observer.h" #include "solib.h" #include "cli/cli-decode.h" #include "cli/cli-setshow.h" #include "target-descriptions.h" #include <ctype.h> #include <sys/time.h> #include "event-loop.h" #include "event-top.h" #include "inf-loop.h" #include <signal.h> #include "serial.h" #include "gdbcore.h" /* for exec_bfd */ #include "remote-fileio.h" #include "gdb/fileio.h" #include "gdb_stat.h" #include "xml-support.h" #include "memory-map.h" #include "tracepoint.h" #include "ax.h" #include "ax-gdb.h" /* temp hacks for tracepoint encoding migration */ static char *target_buf; static long target_buf_size; /*static*/ void encode_actions (struct breakpoint *t, char ***tdp_actions, char ***stepping_actions); /* The size to align memory write packets, when practical. The protocol does not guarantee any alignment, and gdb will generate short writes and unaligned writes, but even as a best-effort attempt this can improve bulk transfers. For instance, if a write is misaligned relative to the target's data bus, the stub may need to make an extra round trip fetching data from the target. This doesn't make a huge difference, but it's easy to do, so we try to be helpful. The alignment chosen is arbitrary; usually data bus width is important here, not the possibly larger cache line size. */ enum { REMOTE_ALIGN_WRITES = 16 }; /* Prototypes for local functions. */ static void cleanup_sigint_signal_handler (void *dummy); static void initialize_sigint_signal_handler (void); static int getpkt_sane (char **buf, long *sizeof_buf, int forever); static int getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever); static void handle_remote_sigint (int); static void handle_remote_sigint_twice (int); static void async_remote_interrupt (gdb_client_data); void async_remote_interrupt_twice (gdb_client_data); static void remote_files_info (struct target_ops *ignore); static void remote_prepare_to_store (struct regcache *regcache); static void remote_open (char *name, int from_tty); static void extended_remote_open (char *name, int from_tty); static void remote_open_1 (char *, int, struct target_ops *, int extended_p); static void remote_close (int quitting); static void remote_mourn (struct target_ops *ops); static void extended_remote_restart (void); static void extended_remote_mourn (struct target_ops *); static void remote_mourn_1 (struct target_ops *); static void remote_send (char **buf, long *sizeof_buf_p); static int readchar (int timeout); static void remote_kill (struct target_ops *ops); static int tohex (int nib); static int remote_can_async_p (void); static int remote_is_async_p (void); static void remote_async (void (*callback) (enum inferior_event_type event_type, void *context), void *context); static int remote_async_mask (int new_mask); static void remote_detach (struct target_ops *ops, char *args, int from_tty); static void remote_interrupt (int signo); static void remote_interrupt_twice (int signo); static void interrupt_query (void); static void set_general_thread (struct ptid ptid); static void set_continue_thread (struct ptid ptid); static void get_offsets (void); static void skip_frame (void); static long read_frame (char **buf_p, long *sizeof_buf); static int hexnumlen (ULONGEST num); static void init_remote_ops (void); static void init_extended_remote_ops (void); static void remote_stop (ptid_t); static int ishex (int ch, int *val); static int stubhex (int ch); static int hexnumstr (char *, ULONGEST); static int hexnumnstr (char *, ULONGEST, int); static CORE_ADDR remote_address_masked (CORE_ADDR); static void print_packet (char *); static unsigned long crc32 (unsigned char *, int, unsigned int); static void compare_sections_command (char *, int); static void packet_command (char *, int); static int stub_unpack_int (char *buff, int fieldlength); static ptid_t remote_current_thread (ptid_t oldptid); static void remote_find_new_threads (void); static void record_currthread (ptid_t currthread); static int fromhex (int a); extern int hex2bin (const char *hex, gdb_byte *bin, int count); extern int bin2hex (const gdb_byte *bin, char *hex, int count); static int putpkt_binary (char *buf, int cnt); static void check_binary_download (CORE_ADDR addr); struct packet_config; static void show_packet_config_cmd (struct packet_config *config); static void update_packet_config (struct packet_config *config); static void set_remote_protocol_packet_cmd (char *args, int from_tty, struct cmd_list_element *c); static void show_remote_protocol_packet_cmd (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value); static char *write_ptid (char *buf, const char *endbuf, ptid_t ptid); static ptid_t read_ptid (char *buf, char **obuf); struct remote_state; static int remote_get_trace_status (struct trace_status *ts); static int remote_upload_tracepoints (struct uploaded_tp **utpp); static int remote_upload_trace_state_variables (struct uploaded_tsv **utsvp); static void remote_query_supported (void); static void remote_check_symbols (struct objfile *objfile); void _initialize_remote (void); struct stop_reply; static struct stop_reply *stop_reply_xmalloc (void); static void stop_reply_xfree (struct stop_reply *); static void do_stop_reply_xfree (void *arg); static void remote_parse_stop_reply (char *buf, struct stop_reply *); static void push_stop_reply (struct stop_reply *); static void remote_get_pending_stop_replies (void); static void discard_pending_stop_replies (int pid); static int peek_stop_reply (ptid_t ptid); static void remote_async_inferior_event_handler (gdb_client_data); static void remote_async_get_pending_events_handler (gdb_client_data); static void remote_terminal_ours (void); static int remote_read_description_p (struct target_ops *target); /* The non-stop remote protocol provisions for one pending stop reply. This is where we keep it until it is acknowledged. */ static struct stop_reply *pending_stop_reply = NULL; /* For "remote". */ static struct cmd_list_element *remote_cmdlist; /* For "set remote" and "show remote". */ static struct cmd_list_element *remote_set_cmdlist; static struct cmd_list_element *remote_show_cmdlist; /* Description of the remote protocol state for the currently connected target. This is per-target state, and independent of the selected architecture. */ struct remote_state { /* A buffer to use for incoming packets, and its current size. The buffer is grown dynamically for larger incoming packets. Outgoing packets may also be constructed in this buffer. BUF_SIZE is always at least REMOTE_PACKET_SIZE; REMOTE_PACKET_SIZE should be used to limit the length of outgoing packets. */ char *buf; long buf_size; /* If we negotiated packet size explicitly (and thus can bypass heuristics for the largest packet size that will not overflow a buffer in the stub), this will be set to that packet size. Otherwise zero, meaning to use the guessed size. */ long explicit_packet_size; /* remote_wait is normally called when the target is running and waits for a stop reply packet. But sometimes we need to call it when the target is already stopped. We can send a "?" packet and have remote_wait read the response. Or, if we already have the response, we can stash it in BUF and tell remote_wait to skip calling getpkt. This flag is set when BUF contains a stop reply packet and the target is not waiting. */ int cached_wait_status; /* True, if in no ack mode. That is, neither GDB nor the stub will expect acks from each other. The connection is assumed to be reliable. */ int noack_mode; /* True if we're connected in extended remote mode. */ int extended; /* True if the stub reported support for multi-process extensions. */ int multi_process_aware; /* True if we resumed the target and we're waiting for the target to stop. In the mean time, we can't start another command/query. The remote server wouldn't be ready to process it, so we'd timeout waiting for a reply that would never come and eventually we'd close the connection. This can happen in asynchronous mode because we allow GDB commands while the target is running. */ int waiting_for_stop_reply; /* True if the stub reports support for non-stop mode. */ int non_stop_aware; /* True if the stub reports support for vCont;t. */ int support_vCont_t; /* True if the stub reports support for conditional tracepoints. */ int cond_tracepoints; /* True if the stub reports support for fast tracepoints. */ int fast_tracepoints; /* True if the stub can continue running a trace while GDB is disconnected. */ int disconnected_tracing; /* Nonzero if the user has pressed Ctrl-C, but the target hasn't responded to that. */ int ctrlc_pending_p; }; /* Private data that we'll store in (struct thread_info)->private. */ struct private_thread_info { char *extra; int core; }; static void free_private_thread_info (struct private_thread_info *info) { xfree (info->extra); xfree (info); } /* Returns true if the multi-process extensions are in effect. */ static int remote_multi_process_p (struct remote_state *rs) { return rs->extended && rs->multi_process_aware; } /* This data could be associated with a target, but we do not always have access to the current target when we need it, so for now it is static. This will be fine for as long as only one target is in use at a time. */ static struct remote_state remote_state; static struct remote_state * get_remote_state_raw (void) { return &remote_state; } /* Description of the remote protocol for a given architecture. */ struct packet_reg { long offset; /* Offset into G packet. */ long regnum; /* GDB's internal register number. */ LONGEST pnum; /* Remote protocol register number. */ int in_g_packet; /* Always part of G packet. */ /* long size in bytes; == register_size (target_gdbarch, regnum); at present. */ /* char *name; == gdbarch_register_name (target_gdbarch, regnum); at present. */ }; struct remote_arch_state { /* Description of the remote protocol registers. */ long sizeof_g_packet; /* Description of the remote protocol registers indexed by REGNUM (making an array gdbarch_num_regs in size). */ struct packet_reg *regs; /* This is the size (in chars) of the first response to the ``g'' packet. It is used as a heuristic when determining the maximum size of memory-read and memory-write packets. A target will typically only reserve a buffer large enough to hold the ``g'' packet. The size does not include packet overhead (headers and trailers). */ long actual_register_packet_size; /* This is the maximum size (in chars) of a non read/write packet. It is also used as a cap on the size of read/write packets. */ long remote_packet_size; }; long sizeof_pkt = 2000; /* Utility: generate error from an incoming stub packet. */ static void trace_error (char *buf) { if (*buf++ != 'E') return; /* not an error msg */ switch (*buf) { case '1': /* malformed packet error */ if (*++buf == '0') /* general case: */ error (_("remote.c: error in outgoing packet.")); else error (_("remote.c: error in outgoing packet at field #%ld."), strtol (buf, NULL, 16)); case '2': error (_("trace API error 0x%s."), ++buf); default: error (_("Target returns error code '%s'."), buf); } } /* Utility: wait for reply from stub, while accepting "O" packets. */ static char * remote_get_noisy_reply (char **buf_p, long *sizeof_buf) { do /* Loop on reply from remote stub. */ { char *buf; QUIT; /* allow user to bail out with ^C */ getpkt (buf_p, sizeof_buf, 0); buf = *buf_p; if (buf[0] == 0) error (_("Target does not support this command.")); else if (buf[0] == 'E') trace_error (buf); else if (buf[0] == 'O' && buf[1] != 'K') remote_console_output (buf + 1); /* 'O' message from stub */ else return buf; /* here's the actual reply */ } while (1); } /* Handle for retreving the remote protocol data from gdbarch. */ static struct gdbarch_data *remote_gdbarch_data_handle; static struct remote_arch_state * get_remote_arch_state (void) { return gdbarch_data (target_gdbarch, remote_gdbarch_data_handle); } /* Fetch the global remote target state. */ static struct remote_state * get_remote_state (void) { /* Make sure that the remote architecture state has been initialized, because doing so might reallocate rs->buf. Any function which calls getpkt also needs to be mindful of changes to rs->buf, but this call limits the number of places which run into trouble. */ get_remote_arch_state (); return get_remote_state_raw (); } static int compare_pnums (const void *lhs_, const void *rhs_) { const struct packet_reg * const *lhs = lhs_; const struct packet_reg * const *rhs = rhs_; if ((*lhs)->pnum < (*rhs)->pnum) return -1; else if ((*lhs)->pnum == (*rhs)->pnum) return 0; else return 1; } static void * init_remote_state (struct gdbarch *gdbarch) { int regnum, num_remote_regs, offset; struct remote_state *rs = get_remote_state_raw (); struct remote_arch_state *rsa; struct packet_reg **remote_regs; rsa = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct remote_arch_state); /* Use the architecture to build a regnum<->pnum table, which will be 1:1 unless a feature set specifies otherwise. */ rsa->regs = GDBARCH_OBSTACK_CALLOC (gdbarch, gdbarch_num_regs (gdbarch), struct packet_reg); for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++) { struct packet_reg *r = &rsa->regs[regnum]; if (register_size (gdbarch, regnum) == 0) /* Do not try to fetch zero-sized (placeholder) registers. */ r->pnum = -1; else r->pnum = gdbarch_remote_register_number (gdbarch, regnum); r->regnum = regnum; } /* Define the g/G packet format as the contents of each register with a remote protocol number, in order of ascending protocol number. */ remote_regs = alloca (gdbarch_num_regs (gdbarch) * sizeof (struct packet_reg *)); for (num_remote_regs = 0, regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++) if (rsa->regs[regnum].pnum != -1) remote_regs[num_remote_regs++] = &rsa->regs[regnum]; qsort (remote_regs, num_remote_regs, sizeof (struct packet_reg *), compare_pnums); for (regnum = 0, offset = 0; regnum < num_remote_regs; regnum++) { remote_regs[regnum]->in_g_packet = 1; remote_regs[regnum]->offset = offset; offset += register_size (gdbarch, remote_regs[regnum]->regnum); } /* Record the maximum possible size of the g packet - it may turn out to be smaller. */ rsa->sizeof_g_packet = offset; /* Default maximum number of characters in a packet body. Many remote stubs have a hardwired buffer size of 400 bytes (c.f. BUFMAX in m68k-stub.c and i386-stub.c). BUFMAX-1 is used as the maximum packet-size to ensure that the packet and an extra NUL character can always fit in the buffer. This stops GDB trashing stubs that try to squeeze an extra NUL into what is already a full buffer (As of 1999-12-04 that was most stubs). */ rsa->remote_packet_size = 400 - 1; /* This one is filled in when a ``g'' packet is received. */ rsa->actual_register_packet_size = 0; /* Should rsa->sizeof_g_packet needs more space than the default, adjust the size accordingly. Remember that each byte is encoded as two characters. 32 is the overhead for the packet header / footer. NOTE: cagney/1999-10-26: I suspect that 8 (``$NN:G...#NN'') is a better guess, the below has been padded a little. */ if (rsa->sizeof_g_packet > ((rsa->remote_packet_size - 32) / 2)) rsa->remote_packet_size = (rsa->sizeof_g_packet * 2 + 32); /* Make sure that the packet buffer is plenty big enough for this architecture. */ if (rs->buf_size < rsa->remote_packet_size) { rs->buf_size = 2 * rsa->remote_packet_size; rs->buf = xrealloc (rs->buf, rs->buf_size); } return rsa; } /* Return the current allowed size of a remote packet. This is inferred from the current architecture, and should be used to limit the length of outgoing packets. */ static long get_remote_packet_size (void) { struct remote_state *rs = get_remote_state (); struct remote_arch_state *rsa = get_remote_arch_state (); if (rs->explicit_packet_size) return rs->explicit_packet_size; return rsa->remote_packet_size; } static struct packet_reg * packet_reg_from_regnum (struct remote_arch_state *rsa, long regnum) { if (regnum < 0 && regnum >= gdbarch_num_regs (target_gdbarch)) return NULL; else { struct packet_reg *r = &rsa->regs[regnum]; gdb_assert (r->regnum == regnum); return r; } } static struct packet_reg * packet_reg_from_pnum (struct remote_arch_state *rsa, LONGEST pnum) { int i; for (i = 0; i < gdbarch_num_regs (target_gdbarch); i++) { struct packet_reg *r = &rsa->regs[i]; if (r->pnum == pnum) return r; } return NULL; } /* FIXME: graces/2002-08-08: These variables should eventually be bound to an instance of the target object (as in gdbarch-tdep()), when such a thing exists. */ /* This is set to the data address of the access causing the target to stop for a watchpoint. */ static CORE_ADDR remote_watch_data_address; /* This is non-zero if target stopped for a watchpoint. */ static int remote_stopped_by_watchpoint_p; static struct target_ops remote_ops; static struct target_ops extended_remote_ops; static int remote_async_mask_value = 1; /* FIXME: cagney/1999-09-23: Even though getpkt was called with ``forever'' still use the normal timeout mechanism. This is currently used by the ASYNC code to guarentee that target reads during the initial connect always time-out. Once getpkt has been modified to return a timeout indication and, in turn remote_wait()/wait_for_inferior() have gained a timeout parameter this can go away. */ static int wait_forever_enabled_p = 1; /* Allow the user to specify what sequence to send to the remote when he requests a program interruption: Although ^C is usually what remote systems expect (this is the default, here), it is sometimes preferable to send a break. On other systems such as the Linux kernel, a break followed by g, which is Magic SysRq g is required in order to interrupt the execution. */ const char interrupt_sequence_control_c[] = "Ctrl-C"; const char interrupt_sequence_break[] = "BREAK"; const char interrupt_sequence_break_g[] = "BREAK-g"; static const char *interrupt_sequence_modes[] = { interrupt_sequence_control_c, interrupt_sequence_break, interrupt_sequence_break_g, NULL }; static const char *interrupt_sequence_mode = interrupt_sequence_control_c; static void show_interrupt_sequence (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { if (interrupt_sequence_mode == interrupt_sequence_control_c) fprintf_filtered (file, _("Send the ASCII ETX character (Ctrl-c) " "to the remote target to interrupt the " "execution of the program.\n")); else if (interrupt_sequence_mode == interrupt_sequence_break) fprintf_filtered (file, _("send a break signal to the remote target " "to interrupt the execution of the program.\n")); else if (interrupt_sequence_mode == interrupt_sequence_break_g) fprintf_filtered (file, _("Send a break signal and 'g' a.k.a. Magic SysRq g to " "the remote target to interrupt the execution " "of Linux kernel.\n")); else internal_error (__FILE__, __LINE__, _("Invalid value for interrupt_sequence_mode: %s."), interrupt_sequence_mode); } /* This boolean variable specifies whether interrupt_sequence is sent to the remote target when gdb connects to it. This is mostly needed when you debug the Linux kernel: The Linux kernel expects BREAK g which is Magic SysRq g for connecting gdb. */ static int interrupt_on_connect = 0; /* This variable is used to implement the "set/show remotebreak" commands. Since these commands are now deprecated in favor of "set/show remote interrupt-sequence", it no longer has any effect on the code. */ static int remote_break; static void set_remotebreak (char *args, int from_tty, struct cmd_list_element *c) { if (remote_break) interrupt_sequence_mode = interrupt_sequence_break; else interrupt_sequence_mode = interrupt_sequence_control_c; } static void show_remotebreak (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { } /* Descriptor for I/O to remote machine. Initialize it to NULL so that remote_open knows that we don't have a file open when the program starts. */ static struct serial *remote_desc = NULL; /* This variable sets the number of bits in an address that are to be sent in a memory ("M" or "m") packet. Normally, after stripping leading zeros, the entire address would be sent. This variable restricts the address to REMOTE_ADDRESS_SIZE bits. HISTORY: The initial implementation of remote.c restricted the address sent in memory packets to ``host::sizeof long'' bytes - (typically 32 bits). Consequently, for 64 bit targets, the upper 32 bits of an address was never sent. Since fixing this bug may cause a break in some remote targets this variable is principly provided to facilitate backward compatibility. */ static int remote_address_size; /* Temporary to track who currently owns the terminal. See remote_terminal_* for more details. */ static int remote_async_terminal_ours_p; /* The executable file to use for "run" on the remote side. */ static char *remote_exec_file = ""; /* User configurable variables for the number of characters in a memory read/write packet. MIN (rsa->remote_packet_size, rsa->sizeof_g_packet) is the default. Some targets need smaller values (fifo overruns, et.al.) and some users need larger values (speed up transfers). The variables ``preferred_*'' (the user request), ``current_*'' (what was actually set) and ``forced_*'' (Positive - a soft limit, negative - a hard limit). */ struct memory_packet_config { char *name; long size; int fixed_p; }; /* Compute the current size of a read/write packet. Since this makes use of ``actual_register_packet_size'' the computation is dynamic. */ static long get_memory_packet_size (struct memory_packet_config *config) { struct remote_state *rs = get_remote_state (); struct remote_arch_state *rsa = get_remote_arch_state (); /* NOTE: The somewhat arbitrary 16k comes from the knowledge (folk law?) that some hosts don't cope very well with large alloca() calls. Eventually the alloca() code will be replaced by calls to xmalloc() and make_cleanups() allowing this restriction to either be lifted or removed. */ #ifndef MAX_REMOTE_PACKET_SIZE #define MAX_REMOTE_PACKET_SIZE 16384 #endif /* NOTE: 20 ensures we can write at least one byte. */ #ifndef MIN_REMOTE_PACKET_SIZE #define MIN_REMOTE_PACKET_SIZE 20 #endif long what_they_get; if (config->fixed_p) { if (config->size <= 0) what_they_get = MAX_REMOTE_PACKET_SIZE; else what_they_get = config->size; } else { what_they_get = get_remote_packet_size (); /* Limit the packet to the size specified by the user. */ if (config->size > 0 && what_they_get > config->size) what_they_get = config->size; /* Limit it to the size of the targets ``g'' response unless we have permission from the stub to use a larger packet size. */ if (rs->explicit_packet_size == 0 && rsa->actual_register_packet_size > 0 && what_they_get > rsa->actual_register_packet_size) what_they_get = rsa->actual_register_packet_size; } if (what_they_get > MAX_REMOTE_PACKET_SIZE) what_they_get = MAX_REMOTE_PACKET_SIZE; if (what_they_get < MIN_REMOTE_PACKET_SIZE) what_they_get = MIN_REMOTE_PACKET_SIZE; /* Make sure there is room in the global buffer for this packet (including its trailing NUL byte). */ if (rs->buf_size < what_they_get + 1) { rs->buf_size = 2 * what_they_get; rs->buf = xrealloc (rs->buf, 2 * what_they_get); } return what_they_get; } /* Update the size of a read/write packet. If they user wants something really big then do a sanity check. */ static void set_memory_packet_size (char *args, struct memory_packet_config *config) { int fixed_p = config->fixed_p; long size = config->size; if (args == NULL) error (_("Argument required (integer, `fixed' or `limited').")); else if (strcmp (args, "hard") == 0 || strcmp (args, "fixed") == 0) fixed_p = 1; else if (strcmp (args, "soft") == 0 || strcmp (args, "limit") == 0) fixed_p = 0; else { char *end; size = strtoul (args, &end, 0); if (args == end) error (_("Invalid %s (bad syntax)."), config->name); #if 0 /* Instead of explicitly capping the size of a packet to MAX_REMOTE_PACKET_SIZE or dissallowing it, the user is instead allowed to set the size to something arbitrarily large. */ if (size > MAX_REMOTE_PACKET_SIZE) error (_("Invalid %s (too large)."), config->name); #endif } /* Extra checks? */ if (fixed_p && !config->fixed_p) { if (! query (_("The target may not be able to correctly handle a %s\n" "of %ld bytes. Change the packet size? "), config->name, size)) error (_("Packet size not changed.")); } /* Update the config. */ config->fixed_p = fixed_p; config->size = size; } static void show_memory_packet_size (struct memory_packet_config *config) { printf_filtered (_("The %s is %ld. "), config->name, config->size); if (config->fixed_p) printf_filtered (_("Packets are fixed at %ld bytes.\n"), get_memory_packet_size (config)); else printf_filtered (_("Packets are limited to %ld bytes.\n"), get_memory_packet_size (config)); } static struct memory_packet_config memory_write_packet_config = { "memory-write-packet-size", }; static void set_memory_write_packet_size (char *args, int from_tty) { set_memory_packet_size (args, &memory_write_packet_config); } static void show_memory_write_packet_size (char *args, int from_tty) { show_memory_packet_size (&memory_write_packet_config); } static long get_memory_write_packet_size (void) { return get_memory_packet_size (&memory_write_packet_config); } static struct memory_packet_config memory_read_packet_config = { "memory-read-packet-size", }; static void set_memory_read_packet_size (char *args, int from_tty) { set_memory_packet_size (args, &memory_read_packet_config); } static void show_memory_read_packet_size (char *args, int from_tty) { show_memory_packet_size (&memory_read_packet_config); } static long get_memory_read_packet_size (void) { long size = get_memory_packet_size (&memory_read_packet_config); /* FIXME: cagney/1999-11-07: Functions like getpkt() need to get an extra buffer size argument before the memory read size can be increased beyond this. */ if (size > get_remote_packet_size ()) size = get_remote_packet_size (); return size; } /* Generic configuration support for packets the stub optionally supports. Allows the user to specify the use of the packet as well as allowing GDB to auto-detect support in the remote stub. */ enum packet_support { PACKET_SUPPORT_UNKNOWN = 0, PACKET_ENABLE, PACKET_DISABLE }; struct packet_config { const char *name; const char *title; enum auto_boolean detect; enum packet_support support; }; /* Analyze a packet's return value and update the packet config accordingly. */ enum packet_result { PACKET_ERROR, PACKET_OK, PACKET_UNKNOWN }; static void update_packet_config (struct packet_config *config) { switch (config->detect) { case AUTO_BOOLEAN_TRUE: config->support = PACKET_ENABLE; break; case AUTO_BOOLEAN_FALSE: config->support = PACKET_DISABLE; break; case AUTO_BOOLEAN_AUTO: config->support = PACKET_SUPPORT_UNKNOWN; break; } } static void show_packet_config_cmd (struct packet_config *config) { char *support = "internal-error"; switch (config->support) { case PACKET_ENABLE: support = "enabled"; break; case PACKET_DISABLE: support = "disabled"; break; case PACKET_SUPPORT_UNKNOWN: support = "unknown"; break; } switch (config->detect) { case AUTO_BOOLEAN_AUTO: printf_filtered (_("Support for the `%s' packet is auto-detected, currently %s.\n"), config->name, support); break; case AUTO_BOOLEAN_TRUE: case AUTO_BOOLEAN_FALSE: printf_filtered (_("Support for the `%s' packet is currently %s.\n"), config->name, support); break; } } static void add_packet_config_cmd (struct packet_config *config, const char *name, const char *title, int legacy) { char *set_doc; char *show_doc; char *cmd_name; config->name = name; config->title = title; config->detect = AUTO_BOOLEAN_AUTO; config->support = PACKET_SUPPORT_UNKNOWN; set_doc = xstrprintf ("Set use of remote protocol `%s' (%s) packet", name, title); show_doc = xstrprintf ("Show current use of remote protocol `%s' (%s) packet", name, title); /* set/show TITLE-packet {auto,on,off} */ cmd_name = xstrprintf ("%s-packet", title); add_setshow_auto_boolean_cmd (cmd_name, class_obscure, &config->detect, set_doc, show_doc, NULL, /* help_doc */ set_remote_protocol_packet_cmd, show_remote_protocol_packet_cmd, &remote_set_cmdlist, &remote_show_cmdlist); /* The command code copies the documentation strings. */ xfree (set_doc); xfree (show_doc); /* set/show remote NAME-packet {auto,on,off} -- legacy. */ if (legacy) { char *legacy_name; legacy_name = xstrprintf ("%s-packet", name); add_alias_cmd (legacy_name, cmd_name, class_obscure, 0, &remote_set_cmdlist); add_alias_cmd (legacy_name, cmd_name, class_obscure, 0, &remote_show_cmdlist); } } static enum packet_result packet_check_result (const char *buf) { if (buf[0] != '\0') { /* The stub recognized the packet request. Check that the operation succeeded. */ if (buf[0] == 'E' && isxdigit (buf[1]) && isxdigit (buf[2]) && buf[3] == '\0') /* "Enn" - definitly an error. */ return PACKET_ERROR; /* Always treat "E." as an error. This will be used for more verbose error messages, such as E.memtypes. */ if (buf[0] == 'E' && buf[1] == '.') return PACKET_ERROR; /* The packet may or may not be OK. Just assume it is. */ return PACKET_OK; } else /* The stub does not support the packet. */ return PACKET_UNKNOWN; } static enum packet_result packet_ok (const char *buf, struct packet_config *config) { enum packet_result result; result = packet_check_result (buf); switch (result) { case PACKET_OK: case PACKET_ERROR: /* The stub recognized the packet request. */ switch (config->support) { case PACKET_SUPPORT_UNKNOWN: if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Packet %s (%s) is supported\n", config->name, config->title); config->support = PACKET_ENABLE; break; case PACKET_DISABLE: internal_error (__FILE__, __LINE__, _("packet_ok: attempt to use a disabled packet")); break; case PACKET_ENABLE: break; } break; case PACKET_UNKNOWN: /* The stub does not support the packet. */ switch (config->support) { case PACKET_ENABLE: if (config->detect == AUTO_BOOLEAN_AUTO) /* If the stub previously indicated that the packet was supported then there is a protocol error.. */ error (_("Protocol error: %s (%s) conflicting enabled responses."), config->name, config->title); else /* The user set it wrong. */ error (_("Enabled packet %s (%s) not recognized by stub"), config->name, config->title); break; case PACKET_SUPPORT_UNKNOWN: if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Packet %s (%s) is NOT supported\n", config->name, config->title); config->support = PACKET_DISABLE; break; case PACKET_DISABLE: break; } break; } return result; } enum { PACKET_vCont = 0, PACKET_X, PACKET_qSymbol, PACKET_P, PACKET_p, PACKET_Z0, PACKET_Z1, PACKET_Z2, PACKET_Z3, PACKET_Z4, PACKET_vFile_open, PACKET_vFile_pread, PACKET_vFile_pwrite, PACKET_vFile_close, PACKET_vFile_unlink, PACKET_qXfer_auxv, PACKET_qXfer_features, PACKET_qXfer_libraries, PACKET_qXfer_memory_map, PACKET_qXfer_spu_read, PACKET_qXfer_spu_write, PACKET_qXfer_osdata, PACKET_qXfer_threads, PACKET_qGetTLSAddr, PACKET_qSupported, PACKET_QPassSignals, PACKET_qSearch_memory, PACKET_vAttach, PACKET_vRun, PACKET_QStartNoAckMode, PACKET_vKill, PACKET_qXfer_siginfo_read, PACKET_qXfer_siginfo_write, PACKET_qAttached, PACKET_ConditionalTracepoints, PACKET_FastTracepoints, PACKET_bc, PACKET_bs, PACKET_MAX }; static struct packet_config remote_protocol_packets[PACKET_MAX]; static void set_remote_protocol_packet_cmd (char *args, int from_tty, struct cmd_list_element *c) { struct packet_config *packet; for (packet = remote_protocol_packets; packet < &remote_protocol_packets[PACKET_MAX]; packet++) { if (&packet->detect == c->var) { update_packet_config (packet); return; } } internal_error (__FILE__, __LINE__, "Could not find config for %s", c->name); } static void show_remote_protocol_packet_cmd (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { struct packet_config *packet; for (packet = remote_protocol_packets; packet < &remote_protocol_packets[PACKET_MAX]; packet++) { if (&packet->detect == c->var) { show_packet_config_cmd (packet); return; } } internal_error (__FILE__, __LINE__, "Could not find config for %s", c->name); } /* Should we try one of the 'Z' requests? */ enum Z_packet_type { Z_PACKET_SOFTWARE_BP, Z_PACKET_HARDWARE_BP, Z_PACKET_WRITE_WP, Z_PACKET_READ_WP, Z_PACKET_ACCESS_WP, NR_Z_PACKET_TYPES }; /* For compatibility with older distributions. Provide a ``set remote Z-packet ...'' command that updates all the Z packet types. */ static enum auto_boolean remote_Z_packet_detect; static void set_remote_protocol_Z_packet_cmd (char *args, int from_tty, struct cmd_list_element *c) { int i; for (i = 0; i < NR_Z_PACKET_TYPES; i++) { remote_protocol_packets[PACKET_Z0 + i].detect = remote_Z_packet_detect; update_packet_config (&remote_protocol_packets[PACKET_Z0 + i]); } } static void show_remote_protocol_Z_packet_cmd (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { int i; for (i = 0; i < NR_Z_PACKET_TYPES; i++) { show_packet_config_cmd (&remote_protocol_packets[PACKET_Z0 + i]); } } /* Should we try the 'ThreadInfo' query packet? This variable (NOT available to the user: auto-detect only!) determines whether GDB will use the new, simpler "ThreadInfo" query or the older, more complex syntax for thread queries. This is an auto-detect variable (set to true at each connect, and set to false when the target fails to recognize it). */ static int use_threadinfo_query; static int use_threadextra_query; /* Tokens for use by the asynchronous signal handlers for SIGINT. */ static struct async_signal_handler *sigint_remote_twice_token; static struct async_signal_handler *sigint_remote_token; /* Asynchronous signal handle registered as event loop source for when we have pending events ready to be passed to the core. */ static struct async_event_handler *remote_async_inferior_event_token; /* Asynchronous signal handle registered as event loop source for when the remote sent us a %Stop notification. The registered callback will do a vStopped sequence to pull the rest of the events out of the remote side into our event queue. */ static struct async_event_handler *remote_async_get_pending_events_token; static ptid_t magic_null_ptid; static ptid_t not_sent_ptid; static ptid_t any_thread_ptid; /* These are the threads which we last sent to the remote system. The TID member will be -1 for all or -2 for not sent yet. */ static ptid_t general_thread; static ptid_t continue_thread; /* Find out if the stub attached to PID (and hence GDB should offer to detach instead of killing it when bailing out). */ static int remote_query_attached (int pid) { struct remote_state *rs = get_remote_state (); if (remote_protocol_packets[PACKET_qAttached].support == PACKET_DISABLE) return 0; if (remote_multi_process_p (rs)) sprintf (rs->buf, "qAttached:%x", pid); else sprintf (rs->buf, "qAttached"); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_qAttached])) { case PACKET_OK: if (strcmp (rs->buf, "1") == 0) return 1; break; case PACKET_ERROR: warning (_("Remote failure reply: %s"), rs->buf); break; case PACKET_UNKNOWN: break; } return 0; } /* Add PID to GDB's inferior table. Since we can be connected to a remote system before before knowing about any inferior, mark the target with execution when we find the first inferior. If ATTACHED is 1, then we had just attached to this inferior. If it is 0, then we just created this inferior. If it is -1, then try querying the remote stub to find out if it had attached to the inferior or not. */ static struct inferior * remote_add_inferior (int pid, int attached) { struct inferior *inf; /* Check whether this process we're learning about is to be considered attached, or if is to be considered to have been spawned by the stub. */ if (attached == -1) attached = remote_query_attached (pid); if (gdbarch_has_global_solist (target_gdbarch)) { /* If the target shares code across all inferiors, then every attach adds a new inferior. */ inf = add_inferior (pid); /* ... and every inferior is bound to the same program space. However, each inferior may still have its own address space. */ inf->aspace = maybe_new_address_space (); inf->pspace = current_program_space; } else { /* In the traditional debugging scenario, there's a 1-1 match between program/address spaces. We simply bind the inferior to the program space's address space. */ inf = current_inferior (); inferior_appeared (inf, pid); } inf->attach_flag = attached; return inf; } /* Add thread PTID to GDB's thread list. Tag it as executing/running according to RUNNING. */ static void remote_add_thread (ptid_t ptid, int running) { add_thread (ptid); set_executing (ptid, running); set_running (ptid, running); } /* Come here when we learn about a thread id from the remote target. It may be the first time we hear about such thread, so take the opportunity to add it to GDB's thread list. In case this is the first time we're noticing its corresponding inferior, add it to GDB's inferior list as well. */ static void remote_notice_new_inferior (ptid_t currthread, int running) { /* If this is a new thread, add it to GDB's thread list. If we leave it up to WFI to do this, bad things will happen. */ if (in_thread_list (currthread) && is_exited (currthread)) { /* We're seeing an event on a thread id we knew had exited. This has to be a new thread reusing the old id. Add it. */ remote_add_thread (currthread, running); return; } if (!in_thread_list (currthread)) { struct inferior *inf = NULL; int pid = ptid_get_pid (currthread); if (ptid_is_pid (inferior_ptid) && pid == ptid_get_pid (inferior_ptid)) { /* inferior_ptid has no thread member yet. This can happen with the vAttach -> remote_wait,"TAAthread:" path if the stub doesn't support qC. This is the first stop reported after an attach, so this is the main thread. Update the ptid in the thread list. */ if (in_thread_list (pid_to_ptid (pid))) thread_change_ptid (inferior_ptid, currthread); else { remote_add_thread (currthread, running); inferior_ptid = currthread; } return; } if (ptid_equal (magic_null_ptid, inferior_ptid)) { /* inferior_ptid is not set yet. This can happen with the vRun -> remote_wait,"TAAthread:" path if the stub doesn't support qC. This is the first stop reported after an attach, so this is the main thread. Update the ptid in the thread list. */ thread_change_ptid (inferior_ptid, currthread); return; } /* When connecting to a target remote, or to a target extended-remote which already was debugging an inferior, we may not know about it yet. Add it before adding its child thread, so notifications are emitted in a sensible order. */ if (!in_inferior_list (ptid_get_pid (currthread))) inf = remote_add_inferior (ptid_get_pid (currthread), -1); /* This is really a new thread. Add it. */ remote_add_thread (currthread, running); /* If we found a new inferior, let the common code do whatever it needs to with it (e.g., read shared libraries, insert breakpoints). */ if (inf != NULL) notice_new_inferior (currthread, running, 0); } } /* Return the private thread data, creating it if necessary. */ struct private_thread_info * demand_private_info (ptid_t ptid) { struct thread_info *info = find_thread_ptid (ptid); gdb_assert (info); if (!info->private) { info->private = xmalloc (sizeof (*(info->private))); info->private_dtor = free_private_thread_info; info->private->core = -1; info->private->extra = 0; } return info->private; } /* Call this function as a result of 1) A halt indication (T packet) containing a thread id 2) A direct query of currthread 3) Successful execution of set thread */ static void record_currthread (ptid_t currthread) { general_thread = currthread; } static char *last_pass_packet; /* If 'QPassSignals' is supported, tell the remote stub what signals it can simply pass through to the inferior without reporting. */ static void remote_pass_signals (void) { if (remote_protocol_packets[PACKET_QPassSignals].support != PACKET_DISABLE) { char *pass_packet, *p; int numsigs = (int) TARGET_SIGNAL_LAST; int count = 0, i; gdb_assert (numsigs < 256); for (i = 0; i < numsigs; i++) { if (signal_stop_state (i) == 0 && signal_print_state (i) == 0 && signal_pass_state (i) == 1) count++; } pass_packet = xmalloc (count * 3 + strlen ("QPassSignals:") + 1); strcpy (pass_packet, "QPassSignals:"); p = pass_packet + strlen (pass_packet); for (i = 0; i < numsigs; i++) { if (signal_stop_state (i) == 0 && signal_print_state (i) == 0 && signal_pass_state (i) == 1) { if (i >= 16) *p++ = tohex (i >> 4); *p++ = tohex (i & 15); if (count) *p++ = ';'; else break; count--; } } *p = 0; if (!last_pass_packet || strcmp (last_pass_packet, pass_packet)) { struct remote_state *rs = get_remote_state (); char *buf = rs->buf; putpkt (pass_packet); getpkt (&rs->buf, &rs->buf_size, 0); packet_ok (buf, &remote_protocol_packets[PACKET_QPassSignals]); if (last_pass_packet) xfree (last_pass_packet); last_pass_packet = pass_packet; } else xfree (pass_packet); } } /* If PTID is MAGIC_NULL_PTID, don't set any thread. If PTID is MINUS_ONE_PTID, set the thread to -1, so the stub returns the thread. If GEN is set, set the general thread, if not, then set the step/continue thread. */ static void set_thread (struct ptid ptid, int gen) { struct remote_state *rs = get_remote_state (); ptid_t state = gen ? general_thread : continue_thread; char *buf = rs->buf; char *endbuf = rs->buf + get_remote_packet_size (); if (ptid_equal (state, ptid)) return; *buf++ = 'H'; *buf++ = gen ? 'g' : 'c'; if (ptid_equal (ptid, magic_null_ptid)) xsnprintf (buf, endbuf - buf, "0"); else if (ptid_equal (ptid, any_thread_ptid)) xsnprintf (buf, endbuf - buf, "0"); else if (ptid_equal (ptid, minus_one_ptid)) xsnprintf (buf, endbuf - buf, "-1"); else write_ptid (buf, endbuf, ptid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (gen) general_thread = ptid; else continue_thread = ptid; } static void set_general_thread (struct ptid ptid) { set_thread (ptid, 1); } static void set_continue_thread (struct ptid ptid) { set_thread (ptid, 0); } /* Change the remote current process. Which thread within the process ends up selected isn't important, as long as it is the same process as what INFERIOR_PTID points to. This comes from that fact that there is no explicit notion of "selected process" in the protocol. The selected process for general operations is the process the selected general thread belongs to. */ static void set_general_process (void) { struct remote_state *rs = get_remote_state (); /* If the remote can't handle multiple processes, don't bother. */ if (!remote_multi_process_p (rs)) return; /* We only need to change the remote current thread if it's pointing at some other process. */ if (ptid_get_pid (general_thread) != ptid_get_pid (inferior_ptid)) set_general_thread (inferior_ptid); } /* Return nonzero if the thread PTID is still alive on the remote system. */ static int remote_thread_alive (struct target_ops *ops, ptid_t ptid) { struct remote_state *rs = get_remote_state (); char *p, *endp; if (ptid_equal (ptid, magic_null_ptid)) /* The main thread is always alive. */ return 1; if (ptid_get_pid (ptid) != 0 && ptid_get_tid (ptid) == 0) /* The main thread is always alive. This can happen after a vAttach, if the remote side doesn't support multi-threading. */ return 1; p = rs->buf; endp = rs->buf + get_remote_packet_size (); *p++ = 'T'; write_ptid (p, endp, ptid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); return (rs->buf[0] == 'O' && rs->buf[1] == 'K'); } /* About these extended threadlist and threadinfo packets. They are variable length packets but, the fields within them are often fixed length. They are redundent enough to send over UDP as is the remote protocol in general. There is a matching unit test module in libstub. */ #define OPAQUETHREADBYTES 8 /* a 64 bit opaque identifier */ typedef unsigned char threadref[OPAQUETHREADBYTES]; /* WARNING: This threadref data structure comes from the remote O.S., libstub protocol encoding, and remote.c. it is not particularly changable. */ /* Right now, the internal structure is int. We want it to be bigger. Plan to fix this. */ typedef int gdb_threadref; /* Internal GDB thread reference. */ /* gdb_ext_thread_info is an internal GDB data structure which is equivalent to the reply of the remote threadinfo packet. */ struct gdb_ext_thread_info { threadref threadid; /* External form of thread reference. */ int active; /* Has state interesting to GDB? regs, stack. */ char display[256]; /* Brief state display, name, blocked/suspended. */ char shortname[32]; /* To be used to name threads. */ char more_display[256]; /* Long info, statistics, queue depth, whatever. */ }; /* The volume of remote transfers can be limited by submitting a mask containing bits specifying the desired information. Use a union of these values as the 'selection' parameter to get_thread_info. FIXME: Make these TAG names more thread specific. */ #define TAG_THREADID 1 #define TAG_EXISTS 2 #define TAG_DISPLAY 4 #define TAG_THREADNAME 8 #define TAG_MOREDISPLAY 16 #define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES * 2) char *unpack_varlen_hex (char *buff, ULONGEST *result); static char *unpack_nibble (char *buf, int *val); static char *pack_nibble (char *buf, int nibble); static char *pack_hex_byte (char *pkt, int /* unsigned char */ byte); static char *unpack_byte (char *buf, int *value); static char *pack_int (char *buf, int value); static char *unpack_int (char *buf, int *value); static char *unpack_string (char *src, char *dest, int length); static char *pack_threadid (char *pkt, threadref *id); static char *unpack_threadid (char *inbuf, threadref *id); void int_to_threadref (threadref *id, int value); static int threadref_to_int (threadref *ref); static void copy_threadref (threadref *dest, threadref *src); static int threadmatch (threadref *dest, threadref *src); static char *pack_threadinfo_request (char *pkt, int mode, threadref *id); static int remote_unpack_thread_info_response (char *pkt, threadref *expectedref, struct gdb_ext_thread_info *info); static int remote_get_threadinfo (threadref *threadid, int fieldset, /*TAG mask */ struct gdb_ext_thread_info *info); static char *pack_threadlist_request (char *pkt, int startflag, int threadcount, threadref *nextthread); static int parse_threadlist_response (char *pkt, int result_limit, threadref *original_echo, threadref *resultlist, int *doneflag); static int remote_get_threadlist (int startflag, threadref *nextthread, int result_limit, int *done, int *result_count, threadref *threadlist); typedef int (*rmt_thread_action) (threadref *ref, void *context); static int remote_threadlist_iterator (rmt_thread_action stepfunction, void *context, int looplimit); static int remote_newthread_step (threadref *ref, void *context); /* Write a PTID to BUF. ENDBUF points to one-passed-the-end of the buffer we're allowed to write to. Returns BUF+CHARACTERS_WRITTEN. */ static char * write_ptid (char *buf, const char *endbuf, ptid_t ptid) { int pid, tid; struct remote_state *rs = get_remote_state (); if (remote_multi_process_p (rs)) { pid = ptid_get_pid (ptid); if (pid < 0) buf += xsnprintf (buf, endbuf - buf, "p-%x.", -pid); else buf += xsnprintf (buf, endbuf - buf, "p%x.", pid); } tid = ptid_get_tid (ptid); if (tid < 0) buf += xsnprintf (buf, endbuf - buf, "-%x", -tid); else buf += xsnprintf (buf, endbuf - buf, "%x", tid); return buf; } /* Extract a PTID from BUF. If non-null, OBUF is set to the to one passed the last parsed char. Returns null_ptid on error. */ static ptid_t read_ptid (char *buf, char **obuf) { char *p = buf; char *pp; ULONGEST pid = 0, tid = 0; if (*p == 'p') { /* Multi-process ptid. */ pp = unpack_varlen_hex (p + 1, &pid); if (*pp != '.') error (_("invalid remote ptid: %s\n"), p); p = pp; pp = unpack_varlen_hex (p + 1, &tid); if (obuf) *obuf = pp; return ptid_build (pid, 0, tid); } /* No multi-process. Just a tid. */ pp = unpack_varlen_hex (p, &tid); /* Since the stub is not sending a process id, then default to what's in inferior_ptid, unless it's null at this point. If so, then since there's no way to know the pid of the reported threads, use the magic number. */ if (ptid_equal (inferior_ptid, null_ptid)) pid = ptid_get_pid (magic_null_ptid); else pid = ptid_get_pid (inferior_ptid); if (obuf) *obuf = pp; return ptid_build (pid, 0, tid); } /* Encode 64 bits in 16 chars of hex. */ static const char hexchars[] = "0123456789abcdef"; static int ishex (int ch, int *val) { if ((ch >= 'a') && (ch <= 'f')) { *val = ch - 'a' + 10; return 1; } if ((ch >= 'A') && (ch <= 'F')) { *val = ch - 'A' + 10; return 1; } if ((ch >= '0') && (ch <= '9')) { *val = ch - '0'; return 1; } return 0; } static int stubhex (int ch) { if (ch >= 'a' && ch <= 'f') return ch - 'a' + 10; if (ch >= '0' && ch <= '9') return ch - '0'; if (ch >= 'A' && ch <= 'F') return ch - 'A' + 10; return -1; } static int stub_unpack_int (char *buff, int fieldlength) { int nibble; int retval = 0; while (fieldlength) { nibble = stubhex (*buff++); retval |= nibble; fieldlength--; if (fieldlength) retval = retval << 4; } return retval; } char * unpack_varlen_hex (char *buff, /* packet to parse */ ULONGEST *result) { int nibble; ULONGEST retval = 0; while (ishex (*buff, &nibble)) { buff++; retval = retval << 4; retval |= nibble & 0x0f; } *result = retval; return buff; } static char * unpack_nibble (char *buf, int *val) { *val = fromhex (*buf++); return buf; } static char * pack_nibble (char *buf, int nibble) { *buf++ = hexchars[(nibble & 0x0f)]; return buf; } static char * pack_hex_byte (char *pkt, int byte) { *pkt++ = hexchars[(byte >> 4) & 0xf]; *pkt++ = hexchars[(byte & 0xf)]; return pkt; } static char * unpack_byte (char *buf, int *value) { *value = stub_unpack_int (buf, 2); return buf + 2; } static char * pack_int (char *buf, int value) { buf = pack_hex_byte (buf, (value >> 24) & 0xff); buf = pack_hex_byte (buf, (value >> 16) & 0xff); buf = pack_hex_byte (buf, (value >> 8) & 0x0ff); buf = pack_hex_byte (buf, (value & 0xff)); return buf; } static char * unpack_int (char *buf, int *value) { *value = stub_unpack_int (buf, 8); return buf + 8; } #if 0 /* Currently unused, uncomment when needed. */ static char *pack_string (char *pkt, char *string); static char * pack_string (char *pkt, char *string) { char ch; int len; len = strlen (string); if (len > 200) len = 200; /* Bigger than most GDB packets, junk??? */ pkt = pack_hex_byte (pkt, len); while (len-- > 0) { ch = *string++; if ((ch == '\0') || (ch == '#')) ch = '*'; /* Protect encapsulation. */ *pkt++ = ch; } return pkt; } #endif /* 0 (unused) */ static char * unpack_string (char *src, char *dest, int length) { while (length--) *dest++ = *src++; *dest = '\0'; return src; } static char * pack_threadid (char *pkt, threadref *id) { char *limit; unsigned char *altid; altid = (unsigned char *) id; limit = pkt + BUF_THREAD_ID_SIZE; while (pkt < limit) pkt = pack_hex_byte (pkt, *altid++); return pkt; } static char * unpack_threadid (char *inbuf, threadref *id) { char *altref; char *limit = inbuf + BUF_THREAD_ID_SIZE; int x, y; altref = (char *) id; while (inbuf < limit) { x = stubhex (*inbuf++); y = stubhex (*inbuf++); *altref++ = (x << 4) | y; } return inbuf; } /* Externally, threadrefs are 64 bits but internally, they are still ints. This is due to a mismatch of specifications. We would like to use 64bit thread references internally. This is an adapter function. */ void int_to_threadref (threadref *id, int value) { unsigned char *scan; scan = (unsigned char *) id; { int i = 4; while (i--) *scan++ = 0; } *scan++ = (value >> 24) & 0xff; *scan++ = (value >> 16) & 0xff; *scan++ = (value >> 8) & 0xff; *scan++ = (value & 0xff); } static int threadref_to_int (threadref *ref) { int i, value = 0; unsigned char *scan; scan = *ref; scan += 4; i = 4; while (i-- > 0) value = (value << 8) | ((*scan++) & 0xff); return value; } static void copy_threadref (threadref *dest, threadref *src) { int i; unsigned char *csrc, *cdest; csrc = (unsigned char *) src; cdest = (unsigned char *) dest; i = 8; while (i--) *cdest++ = *csrc++; } static int threadmatch (threadref *dest, threadref *src) { /* Things are broken right now, so just assume we got a match. */ #if 0 unsigned char *srcp, *destp; int i, result; srcp = (char *) src; destp = (char *) dest; result = 1; while (i-- > 0) result &= (*srcp++ == *destp++) ? 1 : 0; return result; #endif return 1; } /* threadid:1, # always request threadid context_exists:2, display:4, unique_name:8, more_display:16 */ /* Encoding: 'Q':8,'P':8,mask:32,threadid:64 */ static char * pack_threadinfo_request (char *pkt, int mode, threadref *id) { *pkt++ = 'q'; /* Info Query */ *pkt++ = 'P'; /* process or thread info */ pkt = pack_int (pkt, mode); /* mode */ pkt = pack_threadid (pkt, id); /* threadid */ *pkt = '\0'; /* terminate */ return pkt; } /* These values tag the fields in a thread info response packet. */ /* Tagging the fields allows us to request specific fields and to add more fields as time goes by. */ #define TAG_THREADID 1 /* Echo the thread identifier. */ #define TAG_EXISTS 2 /* Is this process defined enough to fetch registers and its stack? */ #define TAG_DISPLAY 4 /* A short thing maybe to put on a window */ #define TAG_THREADNAME 8 /* string, maps 1-to-1 with a thread is. */ #define TAG_MOREDISPLAY 16 /* Whatever the kernel wants to say about the process. */ static int remote_unpack_thread_info_response (char *pkt, threadref *expectedref, struct gdb_ext_thread_info *info) { struct remote_state *rs = get_remote_state (); int mask, length; int tag; threadref ref; char *limit = pkt + rs->buf_size; /* Plausible parsing limit. */ int retval = 1; /* info->threadid = 0; FIXME: implement zero_threadref. */ info->active = 0; info->display[0] = '\0'; info->shortname[0] = '\0'; info->more_display[0] = '\0'; /* Assume the characters indicating the packet type have been stripped. */ pkt = unpack_int (pkt, &mask); /* arg mask */ pkt = unpack_threadid (pkt, &ref); if (mask == 0) warning (_("Incomplete response to threadinfo request.")); if (!threadmatch (&ref, expectedref)) { /* This is an answer to a different request. */ warning (_("ERROR RMT Thread info mismatch.")); return 0; } copy_threadref (&info->threadid, &ref); /* Loop on tagged fields , try to bail if somthing goes wrong. */ /* Packets are terminated with nulls. */ while ((pkt < limit) && mask && *pkt) { pkt = unpack_int (pkt, &tag); /* tag */ pkt = unpack_byte (pkt, &length); /* length */ if (!(tag & mask)) /* Tags out of synch with mask. */ { warning (_("ERROR RMT: threadinfo tag mismatch.")); retval = 0; break; } if (tag == TAG_THREADID) { if (length != 16) { warning (_("ERROR RMT: length of threadid is not 16.")); retval = 0; break; } pkt = unpack_threadid (pkt, &ref); mask = mask & ~TAG_THREADID; continue; } if (tag == TAG_EXISTS) { info->active = stub_unpack_int (pkt, length); pkt += length; mask = mask & ~(TAG_EXISTS); if (length > 8) { warning (_("ERROR RMT: 'exists' length too long.")); retval = 0; break; } continue; } if (tag == TAG_THREADNAME) { pkt = unpack_string (pkt, &info->shortname[0], length); mask = mask & ~TAG_THREADNAME; continue; } if (tag == TAG_DISPLAY) { pkt = unpack_string (pkt, &info->display[0], length); mask = mask & ~TAG_DISPLAY; continue; } if (tag == TAG_MOREDISPLAY) { pkt = unpack_string (pkt, &info->more_display[0], length); mask = mask & ~TAG_MOREDISPLAY; continue; } warning (_("ERROR RMT: unknown thread info tag.")); break; /* Not a tag we know about. */ } return retval; } static int remote_get_threadinfo (threadref *threadid, int fieldset, /* TAG mask */ struct gdb_ext_thread_info *info) { struct remote_state *rs = get_remote_state (); int result; pack_threadinfo_request (rs->buf, fieldset, threadid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == '\0') return 0; result = remote_unpack_thread_info_response (rs->buf + 2, threadid, info); return result; } /* Format: i'Q':8,i"L":8,initflag:8,batchsize:16,lastthreadid:32 */ static char * pack_threadlist_request (char *pkt, int startflag, int threadcount, threadref *nextthread) { *pkt++ = 'q'; /* info query packet */ *pkt++ = 'L'; /* Process LIST or threadLIST request */ pkt = pack_nibble (pkt, startflag); /* initflag 1 bytes */ pkt = pack_hex_byte (pkt, threadcount); /* threadcount 2 bytes */ pkt = pack_threadid (pkt, nextthread); /* 64 bit thread identifier */ *pkt = '\0'; return pkt; } /* Encoding: 'q':8,'M':8,count:16,done:8,argthreadid:64,(threadid:64)* */ static int parse_threadlist_response (char *pkt, int result_limit, threadref *original_echo, threadref *resultlist, int *doneflag) { struct remote_state *rs = get_remote_state (); char *limit; int count, resultcount, done; resultcount = 0; /* Assume the 'q' and 'M chars have been stripped. */ limit = pkt + (rs->buf_size - BUF_THREAD_ID_SIZE); /* done parse past here */ pkt = unpack_byte (pkt, &count); /* count field */ pkt = unpack_nibble (pkt, &done); /* The first threadid is the argument threadid. */ pkt = unpack_threadid (pkt, original_echo); /* should match query packet */ while ((count-- > 0) && (pkt < limit)) { pkt = unpack_threadid (pkt, resultlist++); if (resultcount++ >= result_limit) break; } if (doneflag) *doneflag = done; return resultcount; } static int remote_get_threadlist (int startflag, threadref *nextthread, int result_limit, int *done, int *result_count, threadref *threadlist) { struct remote_state *rs = get_remote_state (); static threadref echo_nextthread; int result = 1; /* Trancate result limit to be smaller than the packet size. */ if ((((result_limit + 1) * BUF_THREAD_ID_SIZE) + 10) >= get_remote_packet_size ()) result_limit = (get_remote_packet_size () / BUF_THREAD_ID_SIZE) - 2; pack_threadlist_request (rs->buf, startflag, result_limit, nextthread); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (*rs->buf == '\0') *result_count = 0; else *result_count = parse_threadlist_response (rs->buf + 2, result_limit, &echo_nextthread, threadlist, done); if (!threadmatch (&echo_nextthread, nextthread)) { /* FIXME: This is a good reason to drop the packet. */ /* Possably, there is a duplicate response. */ /* Possabilities : retransmit immediatly - race conditions retransmit after timeout - yes exit wait for packet, then exit */ warning (_("HMM: threadlist did not echo arg thread, dropping it.")); return 0; /* I choose simply exiting. */ } if (*result_count <= 0) { if (*done != 1) { warning (_("RMT ERROR : failed to get remote thread list.")); result = 0; } return result; /* break; */ } if (*result_count > result_limit) { *result_count = 0; warning (_("RMT ERROR: threadlist response longer than requested.")); return 0; } return result; } /* This is the interface between remote and threads, remotes upper interface. */ /* remote_find_new_threads retrieves the thread list and for each thread in the list, looks up the thread in GDB's internal list, adding the thread if it does not already exist. This involves getting partial thread lists from the remote target so, polling the quit_flag is required. */ /* About this many threadisds fit in a packet. */ #define MAXTHREADLISTRESULTS 32 static int remote_threadlist_iterator (rmt_thread_action stepfunction, void *context, int looplimit) { int done, i, result_count; int startflag = 1; int result = 1; int loopcount = 0; static threadref nextthread; static threadref resultthreadlist[MAXTHREADLISTRESULTS]; done = 0; while (!done) { if (loopcount++ > looplimit) { result = 0; warning (_("Remote fetch threadlist -infinite loop-.")); break; } if (!remote_get_threadlist (startflag, &nextthread, MAXTHREADLISTRESULTS, &done, &result_count, resultthreadlist)) { result = 0; break; } /* Clear for later iterations. */ startflag = 0; /* Setup to resume next batch of thread references, set nextthread. */ if (result_count >= 1) copy_threadref (&nextthread, &resultthreadlist[result_count - 1]); i = 0; while (result_count--) if (!(result = (*stepfunction) (&resultthreadlist[i++], context))) break; } return result; } static int remote_newthread_step (threadref *ref, void *context) { int pid = ptid_get_pid (inferior_ptid); ptid_t ptid = ptid_build (pid, 0, threadref_to_int (ref)); if (!in_thread_list (ptid)) add_thread (ptid); return 1; /* continue iterator */ } #define CRAZY_MAX_THREADS 1000 static ptid_t remote_current_thread (ptid_t oldpid) { struct remote_state *rs = get_remote_state (); putpkt ("qC"); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'Q' && rs->buf[1] == 'C') return read_ptid (&rs->buf[2], NULL); else return oldpid; } /* Find new threads for info threads command. * Original version, using John Metzler's thread protocol. */ static void remote_find_new_threads (void) { remote_threadlist_iterator (remote_newthread_step, 0, CRAZY_MAX_THREADS); } #if defined(HAVE_LIBEXPAT) typedef struct thread_item { ptid_t ptid; char *extra; int core; } thread_item_t; DEF_VEC_O(thread_item_t); struct threads_parsing_context { VEC (thread_item_t) *items; }; static void start_thread (struct gdb_xml_parser *parser, const struct gdb_xml_element *element, void *user_data, VEC(gdb_xml_value_s) *attributes) { struct threads_parsing_context *data = user_data; struct thread_item item; char *id; id = VEC_index (gdb_xml_value_s, attributes, 0)->value; item.ptid = read_ptid (id, NULL); if (VEC_length (gdb_xml_value_s, attributes) > 1) item.core = *(ULONGEST *) VEC_index (gdb_xml_value_s, attributes, 1)->value; else item.core = -1; item.extra = 0; VEC_safe_push (thread_item_t, data->items, &item); } static void end_thread (struct gdb_xml_parser *parser, const struct gdb_xml_element *element, void *user_data, const char *body_text) { struct threads_parsing_context *data = user_data; if (body_text && *body_text) VEC_last (thread_item_t, data->items)->extra = strdup (body_text); } const struct gdb_xml_attribute thread_attributes[] = { { "id", GDB_XML_AF_NONE, NULL, NULL }, { "core", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, { NULL, GDB_XML_AF_NONE, NULL, NULL } }; const struct gdb_xml_element thread_children[] = { { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } }; const struct gdb_xml_element threads_children[] = { { "thread", thread_attributes, thread_children, GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, start_thread, end_thread }, { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } }; const struct gdb_xml_element threads_elements[] = { { "threads", NULL, threads_children, GDB_XML_EF_NONE, NULL, NULL }, { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } }; #endif /* * Find all threads for info threads command. * Uses new thread protocol contributed by Cisco. * Falls back and attempts to use the older method (above) * if the target doesn't respond to the new method. */ static void remote_threads_info (struct target_ops *ops) { struct remote_state *rs = get_remote_state (); char *bufp; ptid_t new_thread; if (remote_desc == 0) /* paranoia */ error (_("Command can only be used when connected to the remote target.")); #if defined(HAVE_LIBEXPAT) if (remote_protocol_packets[PACKET_qXfer_threads].support == PACKET_ENABLE) { char *xml = target_read_stralloc (¤t_target, TARGET_OBJECT_THREADS, NULL); struct cleanup *back_to = make_cleanup (xfree, xml); if (xml && *xml) { struct gdb_xml_parser *parser; struct threads_parsing_context context; struct cleanup *back_to = make_cleanup (null_cleanup, NULL); context.items = 0; parser = gdb_xml_create_parser_and_cleanup (_("threads"), threads_elements, &context); gdb_xml_use_dtd (parser, "threads.dtd"); if (gdb_xml_parse (parser, xml) == 0) { int i; struct thread_item *item; for (i = 0; VEC_iterate (thread_item_t, context.items, i, item); ++i) { if (!ptid_equal (item->ptid, null_ptid)) { struct private_thread_info *info; /* In non-stop mode, we assume new found threads are running until proven otherwise with a stop reply. In all-stop, we can only get here if all threads are stopped. */ int running = non_stop ? 1 : 0; remote_notice_new_inferior (item->ptid, running); info = demand_private_info (item->ptid); info->core = item->core; info->extra = item->extra; item->extra = 0; } xfree (item->extra); } } VEC_free (thread_item_t, context.items); } do_cleanups (back_to); return; } #endif if (use_threadinfo_query) { putpkt ("qfThreadInfo"); getpkt (&rs->buf, &rs->buf_size, 0); bufp = rs->buf; if (bufp[0] != '\0') /* q packet recognized */ { while (*bufp++ == 'm') /* reply contains one or more TID */ { do { new_thread = read_ptid (bufp, &bufp); if (!ptid_equal (new_thread, null_ptid)) { /* In non-stop mode, we assume new found threads are running until proven otherwise with a stop reply. In all-stop, we can only get here if all threads are stopped. */ int running = non_stop ? 1 : 0; remote_notice_new_inferior (new_thread, running); } } while (*bufp++ == ','); /* comma-separated list */ putpkt ("qsThreadInfo"); getpkt (&rs->buf, &rs->buf_size, 0); bufp = rs->buf; } return; /* done */ } } /* Only qfThreadInfo is supported in non-stop mode. */ if (non_stop) return; /* Else fall back to old method based on jmetzler protocol. */ use_threadinfo_query = 0; remote_find_new_threads (); return; } /* * Collect a descriptive string about the given thread. * The target may say anything it wants to about the thread * (typically info about its blocked / runnable state, name, etc.). * This string will appear in the info threads display. * * Optional: targets are not required to implement this function. */ static char * remote_threads_extra_info (struct thread_info *tp) { struct remote_state *rs = get_remote_state (); int result; int set; threadref id; struct gdb_ext_thread_info threadinfo; static char display_buf[100]; /* arbitrary... */ int n = 0; /* position in display_buf */ if (remote_desc == 0) /* paranoia */ internal_error (__FILE__, __LINE__, _("remote_threads_extra_info")); if (ptid_equal (tp->ptid, magic_null_ptid) || (ptid_get_pid (tp->ptid) != 0 && ptid_get_tid (tp->ptid) == 0)) /* This is the main thread which was added by GDB. The remote server doesn't know about it. */ return NULL; if (remote_protocol_packets[PACKET_qXfer_threads].support == PACKET_ENABLE) { struct thread_info *info = find_thread_ptid (tp->ptid); if (info && info->private) return info->private->extra; else return NULL; } if (use_threadextra_query) { char *b = rs->buf; char *endb = rs->buf + get_remote_packet_size (); xsnprintf (b, endb - b, "qThreadExtraInfo,"); b += strlen (b); write_ptid (b, endb, tp->ptid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] != 0) { n = min (strlen (rs->buf) / 2, sizeof (display_buf)); result = hex2bin (rs->buf, (gdb_byte *) display_buf, n); display_buf [result] = '\0'; return display_buf; } } /* If the above query fails, fall back to the old method. */ use_threadextra_query = 0; set = TAG_THREADID | TAG_EXISTS | TAG_THREADNAME | TAG_MOREDISPLAY | TAG_DISPLAY; int_to_threadref (&id, ptid_get_tid (tp->ptid)); if (remote_get_threadinfo (&id, set, &threadinfo)) if (threadinfo.active) { if (*threadinfo.shortname) n += xsnprintf (&display_buf[0], sizeof (display_buf) - n, " Name: %s,", threadinfo.shortname); if (*threadinfo.display) n += xsnprintf (&display_buf[n], sizeof (display_buf) - n, " State: %s,", threadinfo.display); if (*threadinfo.more_display) n += xsnprintf (&display_buf[n], sizeof (display_buf) - n, " Priority: %s", threadinfo.more_display); if (n > 0) { /* For purely cosmetic reasons, clear up trailing commas. */ if (',' == display_buf[n-1]) display_buf[n-1] = ' '; return display_buf; } } return NULL; } /* Implement the to_get_ada_task_ptid function for the remote targets. */ static ptid_t remote_get_ada_task_ptid (long lwp, long thread) { return ptid_build (ptid_get_pid (inferior_ptid), 0, lwp); } /* Restart the remote side; this is an extended protocol operation. */ static void extended_remote_restart (void) { struct remote_state *rs = get_remote_state (); /* Send the restart command; for reasons I don't understand the remote side really expects a number after the "R". */ xsnprintf (rs->buf, get_remote_packet_size (), "R%x", 0); putpkt (rs->buf); remote_fileio_reset (); } /* Clean up connection to a remote debugger. */ static void remote_close (int quitting) { if (remote_desc == NULL) return; /* already closed */ /* Make sure we leave stdin registered in the event loop, and we don't leave the async SIGINT signal handler installed. */ remote_terminal_ours (); serial_close (remote_desc); remote_desc = NULL; /* We don't have a connection to the remote stub anymore. Get rid of all the inferiors and their threads we were controlling. */ discard_all_inferiors (); /* We're no longer interested in any of these events. */ discard_pending_stop_replies (-1); if (remote_async_inferior_event_token) delete_async_event_handler (&remote_async_inferior_event_token); if (remote_async_get_pending_events_token) delete_async_event_handler (&remote_async_get_pending_events_token); } /* Query the remote side for the text, data and bss offsets. */ static void get_offsets (void) { struct remote_state *rs = get_remote_state (); char *buf; char *ptr; int lose, num_segments = 0, do_sections, do_segments; CORE_ADDR text_addr, data_addr, bss_addr, segments[2]; struct section_offsets *offs; struct symfile_segment_data *data; if (symfile_objfile == NULL) return; putpkt ("qOffsets"); getpkt (&rs->buf, &rs->buf_size, 0); buf = rs->buf; if (buf[0] == '\000') return; /* Return silently. Stub doesn't support this command. */ if (buf[0] == 'E') { warning (_("Remote failure reply: %s"), buf); return; } /* Pick up each field in turn. This used to be done with scanf, but scanf will make trouble if CORE_ADDR size doesn't match conversion directives correctly. The following code will work with any size of CORE_ADDR. */ text_addr = data_addr = bss_addr = 0; ptr = buf; lose = 0; if (strncmp (ptr, "Text=", 5) == 0) { ptr += 5; /* Don't use strtol, could lose on big values. */ while (*ptr && *ptr != ';') text_addr = (text_addr << 4) + fromhex (*ptr++); if (strncmp (ptr, ";Data=", 6) == 0) { ptr += 6; while (*ptr && *ptr != ';') data_addr = (data_addr << 4) + fromhex (*ptr++); } else lose = 1; if (!lose && strncmp (ptr, ";Bss=", 5) == 0) { ptr += 5; while (*ptr && *ptr != ';') bss_addr = (bss_addr << 4) + fromhex (*ptr++); if (bss_addr != data_addr) warning (_("Target reported unsupported offsets: %s"), buf); } else lose = 1; } else if (strncmp (ptr, "TextSeg=", 8) == 0) { ptr += 8; /* Don't use strtol, could lose on big values. */ while (*ptr && *ptr != ';') text_addr = (text_addr << 4) + fromhex (*ptr++); num_segments = 1; if (strncmp (ptr, ";DataSeg=", 9) == 0) { ptr += 9; while (*ptr && *ptr != ';') data_addr = (data_addr << 4) + fromhex (*ptr++); num_segments++; } } else lose = 1; if (lose) error (_("Malformed response to offset query, %s"), buf); else if (*ptr != '\0') warning (_("Target reported unsupported offsets: %s"), buf); offs = ((struct section_offsets *) alloca (SIZEOF_N_SECTION_OFFSETS (symfile_objfile->num_sections))); memcpy (offs, symfile_objfile->section_offsets, SIZEOF_N_SECTION_OFFSETS (symfile_objfile->num_sections)); data = get_symfile_segment_data (symfile_objfile->obfd); do_segments = (data != NULL); do_sections = num_segments == 0; if (num_segments > 0) { segments[0] = text_addr; segments[1] = data_addr; } /* If we have two segments, we can still try to relocate everything by assuming that the .text and .data offsets apply to the whole text and data segments. Convert the offsets given in the packet to base addresses for symfile_map_offsets_to_segments. */ else if (data && data->num_segments == 2) { segments[0] = data->segment_bases[0] + text_addr; segments[1] = data->segment_bases[1] + data_addr; num_segments = 2; } /* If the object file has only one segment, assume that it is text rather than data; main programs with no writable data are rare, but programs with no code are useless. Of course the code might have ended up in the data segment... to detect that we would need the permissions here. */ else if (data && data->num_segments == 1) { segments[0] = data->segment_bases[0] + text_addr; num_segments = 1; } /* There's no way to relocate by segment. */ else do_segments = 0; if (do_segments) { int ret = symfile_map_offsets_to_segments (symfile_objfile->obfd, data, offs, num_segments, segments); if (ret == 0 && !do_sections) error (_("Can not handle qOffsets TextSeg response with this symbol file")); if (ret > 0) do_sections = 0; } if (data) free_symfile_segment_data (data); if (do_sections) { offs->offsets[SECT_OFF_TEXT (symfile_objfile)] = text_addr; /* This is a temporary kludge to force data and bss to use the same offsets because that's what nlmconv does now. The real solution requires changes to the stub and remote.c that I don't have time to do right now. */ offs->offsets[SECT_OFF_DATA (symfile_objfile)] = data_addr; offs->offsets[SECT_OFF_BSS (symfile_objfile)] = data_addr; } objfile_relocate (symfile_objfile, offs); } /* Callback for iterate_over_threads. Set the STOP_REQUESTED flags in threads we know are stopped already. This is used during the initial remote connection in non-stop mode --- threads that are reported as already being stopped are left stopped. */ static int set_stop_requested_callback (struct thread_info *thread, void *data) { /* If we have a stop reply for this thread, it must be stopped. */ if (peek_stop_reply (thread->ptid)) set_stop_requested (thread->ptid, 1); return 0; } /* Stub for catch_exception. */ struct start_remote_args { int from_tty; /* The current target. */ struct target_ops *target; /* Non-zero if this is an extended-remote target. */ int extended_p; }; /* Send interrupt_sequence to remote target. */ static void send_interrupt_sequence () { if (interrupt_sequence_mode == interrupt_sequence_control_c) serial_write (remote_desc, "\x03", 1); else if (interrupt_sequence_mode == interrupt_sequence_break) serial_send_break (remote_desc); else if (interrupt_sequence_mode == interrupt_sequence_break_g) { serial_send_break (remote_desc); serial_write (remote_desc, "g", 1); } else internal_error (__FILE__, __LINE__, _("Invalid value for interrupt_sequence_mode: %s."), interrupt_sequence_mode); } static void remote_start_remote (struct ui_out *uiout, void *opaque) { struct start_remote_args *args = opaque; struct remote_state *rs = get_remote_state (); struct packet_config *noack_config; char *wait_status = NULL; immediate_quit++; /* Allow user to interrupt it. */ /* Ack any packet which the remote side has already sent. */ serial_write (remote_desc, "+", 1); if (interrupt_on_connect) send_interrupt_sequence (); /* The first packet we send to the target is the optional "supported packets" request. If the target can answer this, it will tell us which later probes to skip. */ remote_query_supported (); /* Next, we possibly activate noack mode. If the QStartNoAckMode packet configuration is set to AUTO, enable noack mode if the stub reported a wish for it with qSupported. If set to TRUE, then enable noack mode even if the stub didn't report it in qSupported. If the stub doesn't reply OK, the session ends with an error. If FALSE, then don't activate noack mode, regardless of what the stub claimed should be the default with qSupported. */ noack_config = &remote_protocol_packets[PACKET_QStartNoAckMode]; if (noack_config->detect == AUTO_BOOLEAN_TRUE || (noack_config->detect == AUTO_BOOLEAN_AUTO && noack_config->support == PACKET_ENABLE)) { putpkt ("QStartNoAckMode"); getpkt (&rs->buf, &rs->buf_size, 0); if (packet_ok (rs->buf, noack_config) == PACKET_OK) rs->noack_mode = 1; } if (args->extended_p) { /* Tell the remote that we are using the extended protocol. */ putpkt ("!"); getpkt (&rs->buf, &rs->buf_size, 0); } /* Next, if the target can specify a description, read it. We do this before anything involving memory or registers. */ target_find_description (); /* Next, now that we know something about the target, update the address spaces in the program spaces. */ update_address_spaces (); /* On OSs where the list of libraries is global to all processes, we fetch them early. */ if (gdbarch_has_global_solist (target_gdbarch)) solib_add (NULL, args->from_tty, args->target, auto_solib_add); if (non_stop) { if (!rs->non_stop_aware) error (_("Non-stop mode requested, but remote does not support non-stop")); putpkt ("QNonStop:1"); getpkt (&rs->buf, &rs->buf_size, 0); if (strcmp (rs->buf, "OK") != 0) error ("Remote refused setting non-stop mode with: %s", rs->buf); /* Find about threads and processes the stub is already controlling. We default to adding them in the running state. The '?' query below will then tell us about which threads are stopped. */ remote_threads_info (args->target); } else if (rs->non_stop_aware) { /* Don't assume that the stub can operate in all-stop mode. Request it explicitely. */ putpkt ("QNonStop:0"); getpkt (&rs->buf, &rs->buf_size, 0); if (strcmp (rs->buf, "OK") != 0) error ("Remote refused setting all-stop mode with: %s", rs->buf); } /* Check whether the target is running now. */ putpkt ("?"); getpkt (&rs->buf, &rs->buf_size, 0); if (!non_stop) { if (rs->buf[0] == 'W' || rs->buf[0] == 'X') { if (!args->extended_p) error (_("The target is not running (try extended-remote?)")); /* We're connected, but not running. Drop out before we call start_remote. */ return; } else { /* Save the reply for later. */ wait_status = alloca (strlen (rs->buf) + 1); strcpy (wait_status, rs->buf); } /* Let the stub know that we want it to return the thread. */ set_continue_thread (minus_one_ptid); /* Without this, some commands which require an active target (such as kill) won't work. This variable serves (at least) double duty as both the pid of the target process (if it has such), and as a flag indicating that a target is active. These functions should be split out into seperate variables, especially since GDB will someday have a notion of debugging several processes. */ inferior_ptid = magic_null_ptid; /* Now, if we have thread information, update inferior_ptid. */ inferior_ptid = remote_current_thread (inferior_ptid); remote_add_inferior (ptid_get_pid (inferior_ptid), -1); /* Always add the main thread. */ add_thread_silent (inferior_ptid); get_offsets (); /* Get text, data & bss offsets. */ /* If we could not find a description using qXfer, and we know how to do it some other way, try again. This is not supported for non-stop; it could be, but it is tricky if there are no stopped threads when we connect. */ if (remote_read_description_p (args->target) && gdbarch_target_desc (target_gdbarch) == NULL) { target_clear_description (); target_find_description (); } /* Use the previously fetched status. */ gdb_assert (wait_status != NULL); strcpy (rs->buf, wait_status); rs->cached_wait_status = 1; immediate_quit--; start_remote (args->from_tty); /* Initialize gdb process mechanisms. */ } else { /* Clear WFI global state. Do this before finding about new threads and inferiors, and setting the current inferior. Otherwise we would clear the proceed status of the current inferior when we want its stop_soon state to be preserved (see notice_new_inferior). */ init_wait_for_inferior (); /* In non-stop, we will either get an "OK", meaning that there are no stopped threads at this time; or, a regular stop reply. In the latter case, there may be more than one thread stopped --- we pull them all out using the vStopped mechanism. */ if (strcmp (rs->buf, "OK") != 0) { struct stop_reply *stop_reply; struct cleanup *old_chain; stop_reply = stop_reply_xmalloc (); old_chain = make_cleanup (do_stop_reply_xfree, stop_reply); remote_parse_stop_reply (rs->buf, stop_reply); discard_cleanups (old_chain); /* get_pending_stop_replies acks this one, and gets the rest out. */ pending_stop_reply = stop_reply; remote_get_pending_stop_replies (); /* Make sure that threads that were stopped remain stopped. */ iterate_over_threads (set_stop_requested_callback, NULL); } if (target_can_async_p ()) target_async (inferior_event_handler, 0); if (thread_count () == 0) { if (!args->extended_p) error (_("The target is not running (try extended-remote?)")); /* We're connected, but not running. Drop out before we call start_remote. */ return; } /* Let the stub know that we want it to return the thread. */ /* Force the stub to choose a thread. */ set_general_thread (null_ptid); /* Query it. */ inferior_ptid = remote_current_thread (minus_one_ptid); if (ptid_equal (inferior_ptid, minus_one_ptid)) error (_("remote didn't report the current thread in non-stop mode")); get_offsets (); /* Get text, data & bss offsets. */ /* In non-stop mode, any cached wait status will be stored in the stop reply queue. */ gdb_assert (wait_status == NULL); } /* If we connected to a live target, do some additional setup. */ if (target_has_execution) { if (exec_bfd) /* No use without an exec file. */ remote_check_symbols (symfile_objfile); } /* Possibly the target has been engaged in a trace run started previously; find out where things are at. */ if (rs->disconnected_tracing) { struct uploaded_tp *uploaded_tps = NULL; struct uploaded_tsv *uploaded_tsvs = NULL; remote_get_trace_status (current_trace_status ()); if (current_trace_status ()->running) printf_filtered (_("Trace is already running on the target.\n")); /* Get trace state variables first, they may be checked when parsing uploaded commands. */ remote_upload_trace_state_variables (&uploaded_tsvs); merge_uploaded_trace_state_variables (&uploaded_tsvs); remote_upload_tracepoints (&uploaded_tps); merge_uploaded_tracepoints (&uploaded_tps); } /* If breakpoints are global, insert them now. */ if (gdbarch_has_global_breakpoints (target_gdbarch) && breakpoints_always_inserted_mode ()) insert_breakpoints (); } /* Open a connection to a remote debugger. NAME is the filename used for communication. */ static void remote_open (char *name, int from_tty) { remote_open_1 (name, from_tty, &remote_ops, 0); } /* Open a connection to a remote debugger using the extended remote gdb protocol. NAME is the filename used for communication. */ static void extended_remote_open (char *name, int from_tty) { remote_open_1 (name, from_tty, &extended_remote_ops, 1 /*extended_p */); } /* Generic code for opening a connection to a remote target. */ static void init_all_packet_configs (void) { int i; for (i = 0; i < PACKET_MAX; i++) update_packet_config (&remote_protocol_packets[i]); } /* Symbol look-up. */ static void remote_check_symbols (struct objfile *objfile) { struct remote_state *rs = get_remote_state (); char *msg, *reply, *tmp; struct minimal_symbol *sym; int end; if (remote_protocol_packets[PACKET_qSymbol].support == PACKET_DISABLE) return; /* Make sure the remote is pointing at the right process. */ set_general_process (); /* Allocate a message buffer. We can't reuse the input buffer in RS, because we need both at the same time. */ msg = alloca (get_remote_packet_size ()); /* Invite target to request symbol lookups. */ putpkt ("qSymbol::"); getpkt (&rs->buf, &rs->buf_size, 0); packet_ok (rs->buf, &remote_protocol_packets[PACKET_qSymbol]); reply = rs->buf; while (strncmp (reply, "qSymbol:", 8) == 0) { tmp = &reply[8]; end = hex2bin (tmp, (gdb_byte *) msg, strlen (tmp) / 2); msg[end] = '\0'; sym = lookup_minimal_symbol (msg, NULL, NULL); if (sym == NULL) xsnprintf (msg, get_remote_packet_size (), "qSymbol::%s", &reply[8]); else { int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; CORE_ADDR sym_addr = SYMBOL_VALUE_ADDRESS (sym); /* If this is a function address, return the start of code instead of any data function descriptor. */ sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, sym_addr, ¤t_target); xsnprintf (msg, get_remote_packet_size (), "qSymbol:%s:%s", phex_nz (sym_addr, addr_size), &reply[8]); } putpkt (msg); getpkt (&rs->buf, &rs->buf_size, 0); reply = rs->buf; } } static struct serial * remote_serial_open (char *name) { static int udp_warning = 0; /* FIXME: Parsing NAME here is a hack. But we want to warn here instead of in ser-tcp.c, because it is the remote protocol assuming that the serial connection is reliable and not the serial connection promising to be. */ if (!udp_warning && strncmp (name, "udp:", 4) == 0) { warning (_("\ The remote protocol may be unreliable over UDP.\n\ Some events may be lost, rendering further debugging impossible.")); udp_warning = 1; } return serial_open (name); } /* This type describes each known response to the qSupported packet. */ struct protocol_feature { /* The name of this protocol feature. */ const char *name; /* The default for this protocol feature. */ enum packet_support default_support; /* The function to call when this feature is reported, or after qSupported processing if the feature is not supported. The first argument points to this structure. The second argument indicates whether the packet requested support be enabled, disabled, or probed (or the default, if this function is being called at the end of processing and this feature was not reported). The third argument may be NULL; if not NULL, it is a NUL-terminated string taken from the packet following this feature's name and an equals sign. */ void (*func) (const struct protocol_feature *, enum packet_support, const char *); /* The corresponding packet for this feature. Only used if FUNC is remote_supported_packet. */ int packet; }; static void remote_supported_packet (const struct protocol_feature *feature, enum packet_support support, const char *argument) { if (argument) { warning (_("Remote qSupported response supplied an unexpected value for" " \"%s\"."), feature->name); return; } if (remote_protocol_packets[feature->packet].support == PACKET_SUPPORT_UNKNOWN) remote_protocol_packets[feature->packet].support = support; } static void remote_packet_size (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); int packet_size; char *value_end; if (support != PACKET_ENABLE) return; if (value == NULL || *value == '\0') { warning (_("Remote target reported \"%s\" without a size."), feature->name); return; } errno = 0; packet_size = strtol (value, &value_end, 16); if (errno != 0 || *value_end != '\0' || packet_size < 0) { warning (_("Remote target reported \"%s\" with a bad size: \"%s\"."), feature->name, value); return; } if (packet_size > MAX_REMOTE_PACKET_SIZE) { warning (_("limiting remote suggested packet size (%d bytes) to %d"), packet_size, MAX_REMOTE_PACKET_SIZE); packet_size = MAX_REMOTE_PACKET_SIZE; } /* Record the new maximum packet size. */ rs->explicit_packet_size = packet_size; } static void remote_multi_process_feature (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); rs->multi_process_aware = (support == PACKET_ENABLE); } static void remote_non_stop_feature (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); rs->non_stop_aware = (support == PACKET_ENABLE); } static void remote_cond_tracepoint_feature (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); rs->cond_tracepoints = (support == PACKET_ENABLE); } static void remote_fast_tracepoint_feature (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); rs->fast_tracepoints = (support == PACKET_ENABLE); } static void remote_disconnected_tracing_feature (const struct protocol_feature *feature, enum packet_support support, const char *value) { struct remote_state *rs = get_remote_state (); rs->disconnected_tracing = (support == PACKET_ENABLE); } static struct protocol_feature remote_protocol_features[] = { { "PacketSize", PACKET_DISABLE, remote_packet_size, -1 }, { "qXfer:auxv:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_auxv }, { "qXfer:features:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_features }, { "qXfer:libraries:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_libraries }, { "qXfer:memory-map:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_memory_map }, { "qXfer:spu:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_spu_read }, { "qXfer:spu:write", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_spu_write }, { "qXfer:osdata:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_osdata }, { "qXfer:threads:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_threads }, { "QPassSignals", PACKET_DISABLE, remote_supported_packet, PACKET_QPassSignals }, { "QStartNoAckMode", PACKET_DISABLE, remote_supported_packet, PACKET_QStartNoAckMode }, { "multiprocess", PACKET_DISABLE, remote_multi_process_feature, -1 }, { "QNonStop", PACKET_DISABLE, remote_non_stop_feature, -1 }, { "qXfer:siginfo:read", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_siginfo_read }, { "qXfer:siginfo:write", PACKET_DISABLE, remote_supported_packet, PACKET_qXfer_siginfo_write }, { "ConditionalTracepoints", PACKET_DISABLE, remote_cond_tracepoint_feature, PACKET_ConditionalTracepoints }, { "FastTracepoints", PACKET_DISABLE, remote_fast_tracepoint_feature, PACKET_FastTracepoints }, { "DisconnectedTracing", PACKET_DISABLE, remote_disconnected_tracing_feature, -1 }, { "ReverseContinue", PACKET_DISABLE, remote_supported_packet, PACKET_bc }, { "ReverseStep", PACKET_DISABLE, remote_supported_packet, PACKET_bs }, }; static void remote_query_supported (void) { struct remote_state *rs = get_remote_state (); char *next; int i; unsigned char seen [ARRAY_SIZE (remote_protocol_features)]; /* The packet support flags are handled differently for this packet than for most others. We treat an error, a disabled packet, and an empty response identically: any features which must be reported to be used will be automatically disabled. An empty buffer accomplishes this, since that is also the representation for a list containing no features. */ rs->buf[0] = 0; if (remote_protocol_packets[PACKET_qSupported].support != PACKET_DISABLE) { const char *qsupported = gdbarch_qsupported (target_gdbarch); if (qsupported) { char *q; if (rs->extended) q = concat ("qSupported:multiprocess+;", qsupported, NULL); else q = concat ("qSupported:", qsupported, NULL); putpkt (q); xfree (q); } else { if (rs->extended) putpkt ("qSupported:multiprocess+"); else putpkt ("qSupported"); } getpkt (&rs->buf, &rs->buf_size, 0); /* If an error occured, warn, but do not return - just reset the buffer to empty and go on to disable features. */ if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_qSupported]) == PACKET_ERROR) { warning (_("Remote failure reply: %s"), rs->buf); rs->buf[0] = 0; } } memset (seen, 0, sizeof (seen)); next = rs->buf; while (*next) { enum packet_support is_supported; char *p, *end, *name_end, *value; /* First separate out this item from the rest of the packet. If there's another item after this, we overwrite the separator (terminated strings are much easier to work with). */ p = next; end = strchr (p, ';'); if (end == NULL) { end = p + strlen (p); next = end; } else { *end = '\0'; next = end + 1; if (end == p) { warning (_("empty item in \"qSupported\" response")); continue; } } name_end = strchr (p, '='); if (name_end) { /* This is a name=value entry. */ is_supported = PACKET_ENABLE; value = name_end + 1; *name_end = '\0'; } else { value = NULL; switch (end[-1]) { case '+': is_supported = PACKET_ENABLE; break; case '-': is_supported = PACKET_DISABLE; break; case '?': is_supported = PACKET_SUPPORT_UNKNOWN; break; default: warning (_("unrecognized item \"%s\" in \"qSupported\" response"), p); continue; } end[-1] = '\0'; } for (i = 0; i < ARRAY_SIZE (remote_protocol_features); i++) if (strcmp (remote_protocol_features[i].name, p) == 0) { const struct protocol_feature *feature; seen[i] = 1; feature = &remote_protocol_features[i]; feature->func (feature, is_supported, value); break; } } /* If we increased the packet size, make sure to increase the global buffer size also. We delay this until after parsing the entire qSupported packet, because this is the same buffer we were parsing. */ if (rs->buf_size < rs->explicit_packet_size) { rs->buf_size = rs->explicit_packet_size; rs->buf = xrealloc (rs->buf, rs->buf_size); } /* Handle the defaults for unmentioned features. */ for (i = 0; i < ARRAY_SIZE (remote_protocol_features); i++) if (!seen[i]) { const struct protocol_feature *feature; feature = &remote_protocol_features[i]; feature->func (feature, feature->default_support, NULL); } } static void remote_open_1 (char *name, int from_tty, struct target_ops *target, int extended_p) { struct remote_state *rs = get_remote_state (); if (name == 0) error (_("To open a remote debug connection, you need to specify what\n" "serial device is attached to the remote system\n" "(e.g. /dev/ttyS0, /dev/ttya, COM1, etc.).")); /* See FIXME above. */ if (!target_async_permitted) wait_forever_enabled_p = 1; /* If we're connected to a running target, target_preopen will kill it. But if we're connected to a target system with no running process, then we will still be connected when it returns. Ask this question first, before target_preopen has a chance to kill anything. */ if (remote_desc != NULL && !have_inferiors ()) { if (!from_tty || query (_("Already connected to a remote target. Disconnect? "))) pop_target (); else error (_("Still connected.")); } target_preopen (from_tty); unpush_target (target); /* This time without a query. If we were connected to an extended-remote target and target_preopen killed the running process, we may still be connected. If we are starting "target remote" now, the extended-remote target will not have been removed by unpush_target. */ if (remote_desc != NULL && !have_inferiors ()) pop_target (); /* Make sure we send the passed signals list the next time we resume. */ xfree (last_pass_packet); last_pass_packet = NULL; remote_fileio_reset (); reopen_exec_file (); reread_symbols (); remote_desc = remote_serial_open (name); if (!remote_desc) perror_with_name (name); if (baud_rate != -1) { if (serial_setbaudrate (remote_desc, baud_rate)) { /* The requested speed could not be set. Error out to top level after closing remote_desc. Take care to set remote_desc to NULL to avoid closing remote_desc more than once. */ serial_close (remote_desc); remote_desc = NULL; perror_with_name (name); } } serial_raw (remote_desc); /* If there is something sitting in the buffer we might take it as a response to a command, which would be bad. */ serial_flush_input (remote_desc); if (from_tty) { puts_filtered ("Remote debugging using "); puts_filtered (name); puts_filtered ("\n"); } push_target (target); /* Switch to using remote target now. */ /* Register extra event sources in the event loop. */ remote_async_inferior_event_token = create_async_event_handler (remote_async_inferior_event_handler, NULL); remote_async_get_pending_events_token = create_async_event_handler (remote_async_get_pending_events_handler, NULL); /* Reset the target state; these things will be queried either by remote_query_supported or as they are needed. */ init_all_packet_configs (); rs->cached_wait_status = 0; rs->explicit_packet_size = 0; rs->noack_mode = 0; rs->multi_process_aware = 0; rs->extended = extended_p; rs->non_stop_aware = 0; rs->waiting_for_stop_reply = 0; rs->ctrlc_pending_p = 0; general_thread = not_sent_ptid; continue_thread = not_sent_ptid; /* Probe for ability to use "ThreadInfo" query, as required. */ use_threadinfo_query = 1; use_threadextra_query = 1; if (target_async_permitted) { /* With this target we start out by owning the terminal. */ remote_async_terminal_ours_p = 1; /* FIXME: cagney/1999-09-23: During the initial connection it is assumed that the target is already ready and able to respond to requests. Unfortunately remote_start_remote() eventually calls wait_for_inferior() with no timeout. wait_forever_enabled_p gets around this. Eventually a mechanism that allows wait_for_inferior() to expect/get timeouts will be implemented. */ wait_forever_enabled_p = 0; } /* First delete any symbols previously loaded from shared libraries. */ no_shared_libraries (NULL, 0); /* Start afresh. */ init_thread_list (); /* Start the remote connection. If error() or QUIT, discard this target (we'd otherwise be in an inconsistent state) and then propogate the error on up the exception chain. This ensures that the caller doesn't stumble along blindly assuming that the function succeeded. The CLI doesn't have this problem but other UI's, such as MI do. FIXME: cagney/2002-05-19: Instead of re-throwing the exception, this function should return an error indication letting the caller restore the previous state. Unfortunately the command ``target remote'' is directly wired to this function making that impossible. On a positive note, the CLI side of this problem has been fixed - the function set_cmd_context() makes it possible for all the ``target ....'' commands to share a common callback function. See cli-dump.c. */ { struct gdb_exception ex; struct start_remote_args args; args.from_tty = from_tty; args.target = target; args.extended_p = extended_p; ex = catch_exception (uiout, remote_start_remote, &args, RETURN_MASK_ALL); if (ex.reason < 0) { /* Pop the partially set up target - unless something else did already before throwing the exception. */ if (remote_desc != NULL) pop_target (); if (target_async_permitted) wait_forever_enabled_p = 1; throw_exception (ex); } } if (target_async_permitted) wait_forever_enabled_p = 1; } /* This takes a program previously attached to and detaches it. After this is done, GDB can be used to debug some other program. We better not have left any breakpoints in the target program or it'll die when it hits one. */ static void remote_detach_1 (char *args, int from_tty, int extended) { int pid = ptid_get_pid (inferior_ptid); struct remote_state *rs = get_remote_state (); if (args) error (_("Argument given to \"detach\" when remotely debugging.")); if (!target_has_execution) error (_("No process to detach from.")); /* Tell the remote target to detach. */ if (remote_multi_process_p (rs)) sprintf (rs->buf, "D;%x", pid); else strcpy (rs->buf, "D"); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'O' && rs->buf[1] == 'K') ; else if (rs->buf[0] == '\0') error (_("Remote doesn't know how to detach")); else error (_("Can't detach process.")); if (from_tty) { if (remote_multi_process_p (rs)) printf_filtered (_("Detached from remote %s.\n"), target_pid_to_str (pid_to_ptid (pid))); else { if (extended) puts_filtered (_("Detached from remote process.\n")); else puts_filtered (_("Ending remote debugging.\n")); } } discard_pending_stop_replies (pid); target_mourn_inferior (); } static void remote_detach (struct target_ops *ops, char *args, int from_tty) { remote_detach_1 (args, from_tty, 0); } static void extended_remote_detach (struct target_ops *ops, char *args, int from_tty) { remote_detach_1 (args, from_tty, 1); } /* Same as remote_detach, but don't send the "D" packet; just disconnect. */ static void remote_disconnect (struct target_ops *target, char *args, int from_tty) { if (args) error (_("Argument given to \"disconnect\" when remotely debugging.")); /* Make sure we unpush even the extended remote targets; mourn won't do it. So call remote_mourn_1 directly instead of target_mourn_inferior. */ remote_mourn_1 (target); if (from_tty) puts_filtered ("Ending remote debugging.\n"); } /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ static void extended_remote_attach_1 (struct target_ops *target, char *args, int from_tty) { struct remote_state *rs = get_remote_state (); int pid; char *wait_status = NULL; pid = parse_pid_to_attach (args); /* Remote PID can be freely equal to getpid, do not check it here the same way as in other targets. */ if (remote_protocol_packets[PACKET_vAttach].support == PACKET_DISABLE) error (_("This target does not support attaching to a process")); sprintf (rs->buf, "vAttach;%x", pid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_vAttach]) == PACKET_OK) { if (from_tty) printf_unfiltered (_("Attached to %s\n"), target_pid_to_str (pid_to_ptid (pid))); if (!non_stop) { /* Save the reply for later. */ wait_status = alloca (strlen (rs->buf) + 1); strcpy (wait_status, rs->buf); } else if (strcmp (rs->buf, "OK") != 0) error (_("Attaching to %s failed with: %s"), target_pid_to_str (pid_to_ptid (pid)), rs->buf); } else if (remote_protocol_packets[PACKET_vAttach].support == PACKET_DISABLE) error (_("This target does not support attaching to a process")); else error (_("Attaching to %s failed"), target_pid_to_str (pid_to_ptid (pid))); set_current_inferior (remote_add_inferior (pid, 1)); inferior_ptid = pid_to_ptid (pid); if (non_stop) { struct thread_info *thread; /* Get list of threads. */ remote_threads_info (target); thread = first_thread_of_process (pid); if (thread) inferior_ptid = thread->ptid; else inferior_ptid = pid_to_ptid (pid); /* Invalidate our notion of the remote current thread. */ record_currthread (minus_one_ptid); } else { /* Now, if we have thread information, update inferior_ptid. */ inferior_ptid = remote_current_thread (inferior_ptid); /* Add the main thread to the thread list. */ add_thread_silent (inferior_ptid); } /* Next, if the target can specify a description, read it. We do this before anything involving memory or registers. */ target_find_description (); if (!non_stop) { /* Use the previously fetched status. */ gdb_assert (wait_status != NULL); if (target_can_async_p ()) { struct stop_reply *stop_reply; struct cleanup *old_chain; stop_reply = stop_reply_xmalloc (); old_chain = make_cleanup (do_stop_reply_xfree, stop_reply); remote_parse_stop_reply (wait_status, stop_reply); discard_cleanups (old_chain); push_stop_reply (stop_reply); target_async (inferior_event_handler, 0); } else { gdb_assert (wait_status != NULL); strcpy (rs->buf, wait_status); rs->cached_wait_status = 1; } } else gdb_assert (wait_status == NULL); } static void extended_remote_attach (struct target_ops *ops, char *args, int from_tty) { extended_remote_attach_1 (ops, args, from_tty); } /* Convert hex digit A to a number. */ static int fromhex (int a) { if (a >= '0' && a <= '9') return a - '0'; else if (a >= 'a' && a <= 'f') return a - 'a' + 10; else if (a >= 'A' && a <= 'F') return a - 'A' + 10; else error (_("Reply contains invalid hex digit %d"), a); } int hex2bin (const char *hex, gdb_byte *bin, int count) { int i; for (i = 0; i < count; i++) { if (hex[0] == 0 || hex[1] == 0) { /* Hex string is short, or of uneven length. Return the count that has been converted so far. */ return i; } *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); hex += 2; } return i; } /* Convert number NIB to a hex digit. */ static int tohex (int nib) { if (nib < 10) return '0' + nib; else return 'a' + nib - 10; } int bin2hex (const gdb_byte *bin, char *hex, int count) { int i; /* May use a length, or a nul-terminated string as input. */ if (count == 0) count = strlen ((char *) bin); for (i = 0; i < count; i++) { *hex++ = tohex ((*bin >> 4) & 0xf); *hex++ = tohex (*bin++ & 0xf); } *hex = 0; return i; } /* Check for the availability of vCont. This function should also check the response. */ static void remote_vcont_probe (struct remote_state *rs) { char *buf; strcpy (rs->buf, "vCont?"); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); buf = rs->buf; /* Make sure that the features we assume are supported. */ if (strncmp (buf, "vCont", 5) == 0) { char *p = &buf[5]; int support_s, support_S, support_c, support_C; support_s = 0; support_S = 0; support_c = 0; support_C = 0; rs->support_vCont_t = 0; while (p && *p == ';') { p++; if (*p == 's' && (*(p + 1) == ';' || *(p + 1) == 0)) support_s = 1; else if (*p == 'S' && (*(p + 1) == ';' || *(p + 1) == 0)) support_S = 1; else if (*p == 'c' && (*(p + 1) == ';' || *(p + 1) == 0)) support_c = 1; else if (*p == 'C' && (*(p + 1) == ';' || *(p + 1) == 0)) support_C = 1; else if (*p == 't' && (*(p + 1) == ';' || *(p + 1) == 0)) rs->support_vCont_t = 1; p = strchr (p, ';'); } /* If s, S, c, and C are not all supported, we can't use vCont. Clearing BUF will make packet_ok disable the packet. */ if (!support_s || !support_S || !support_c || !support_C) buf[0] = 0; } packet_ok (buf, &remote_protocol_packets[PACKET_vCont]); } /* Helper function for building "vCont" resumptions. Write a resumption to P. ENDP points to one-passed-the-end of the buffer we're allowed to write to. Returns BUF+CHARACTERS_WRITTEN. The thread to be resumed is PTID; STEP and SIGGNAL indicate whether the resumed thread should be single-stepped and/or signalled. If PTID equals minus_one_ptid, then all threads are resumed; if PTID represents a process, then all threads of the process are resumed; the thread to be stepped and/or signalled is given in the global INFERIOR_PTID. */ static char * append_resumption (char *p, char *endp, ptid_t ptid, int step, enum target_signal siggnal) { struct remote_state *rs = get_remote_state (); if (step && siggnal != TARGET_SIGNAL_0) p += xsnprintf (p, endp - p, ";S%02x", siggnal); else if (step) p += xsnprintf (p, endp - p, ";s"); else if (siggnal != TARGET_SIGNAL_0) p += xsnprintf (p, endp - p, ";C%02x", siggnal); else p += xsnprintf (p, endp - p, ";c"); if (remote_multi_process_p (rs) && ptid_is_pid (ptid)) { ptid_t nptid; /* All (-1) threads of process. */ nptid = ptid_build (ptid_get_pid (ptid), 0, -1); p += xsnprintf (p, endp - p, ":"); p = write_ptid (p, endp, nptid); } else if (!ptid_equal (ptid, minus_one_ptid)) { p += xsnprintf (p, endp - p, ":"); p = write_ptid (p, endp, ptid); } return p; } /* Resume the remote inferior by using a "vCont" packet. The thread to be resumed is PTID; STEP and SIGGNAL indicate whether the resumed thread should be single-stepped and/or signalled. If PTID equals minus_one_ptid, then all threads are resumed; the thread to be stepped and/or signalled is given in the global INFERIOR_PTID. This function returns non-zero iff it resumes the inferior. This function issues a strict subset of all possible vCont commands at the moment. */ static int remote_vcont_resume (ptid_t ptid, int step, enum target_signal siggnal) { struct remote_state *rs = get_remote_state (); char *p; char *endp; if (remote_protocol_packets[PACKET_vCont].support == PACKET_SUPPORT_UNKNOWN) remote_vcont_probe (rs); if (remote_protocol_packets[PACKET_vCont].support == PACKET_DISABLE) return 0; p = rs->buf; endp = rs->buf + get_remote_packet_size (); /* If we could generate a wider range of packets, we'd have to worry about overflowing BUF. Should there be a generic "multi-part-packet" packet? */ p += xsnprintf (p, endp - p, "vCont"); if (ptid_equal (ptid, magic_null_ptid)) { /* MAGIC_NULL_PTID means that we don't have any active threads, so we don't have any TID numbers the inferior will understand. Make sure to only send forms that do not specify a TID. */ p = append_resumption (p, endp, minus_one_ptid, step, siggnal); } else if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) { /* Resume all threads (of all processes, or of a single process), with preference for INFERIOR_PTID. This assumes inferior_ptid belongs to the set of all threads we are about to resume. */ if (step || siggnal != TARGET_SIGNAL_0) { /* Step inferior_ptid, with or without signal. */ p = append_resumption (p, endp, inferior_ptid, step, siggnal); } /* And continue others without a signal. */ p = append_resumption (p, endp, ptid, /*step=*/ 0, TARGET_SIGNAL_0); } else { /* Scheduler locking; resume only PTID. */ p = append_resumption (p, endp, ptid, step, siggnal); } gdb_assert (strlen (rs->buf) < get_remote_packet_size ()); putpkt (rs->buf); if (non_stop) { /* In non-stop, the stub replies to vCont with "OK". The stop reply will be reported asynchronously by means of a `%Stop' notification. */ getpkt (&rs->buf, &rs->buf_size, 0); if (strcmp (rs->buf, "OK") != 0) error (_("Unexpected vCont reply in non-stop mode: %s"), rs->buf); } return 1; } /* Tell the remote machine to resume. */ static enum target_signal last_sent_signal = TARGET_SIGNAL_0; static int last_sent_step; static void remote_resume (struct target_ops *ops, ptid_t ptid, int step, enum target_signal siggnal) { struct remote_state *rs = get_remote_state (); char *buf; last_sent_signal = siggnal; last_sent_step = step; /* Update the inferior on signals to silently pass, if they've changed. */ remote_pass_signals (); /* The vCont packet doesn't need to specify threads via Hc. */ /* No reverse support (yet) for vCont. */ if (execution_direction != EXEC_REVERSE) if (remote_vcont_resume (ptid, step, siggnal)) goto done; /* All other supported resume packets do use Hc, so set the continue thread. */ if (ptid_equal (ptid, minus_one_ptid)) set_continue_thread (any_thread_ptid); else set_continue_thread (ptid); buf = rs->buf; if (execution_direction == EXEC_REVERSE) { /* We don't pass signals to the target in reverse exec mode. */ if (info_verbose && siggnal != TARGET_SIGNAL_0) warning (" - Can't pass signal %d to target in reverse: ignored.\n", siggnal); if (step && remote_protocol_packets[PACKET_bs].support == PACKET_DISABLE) error (_("Remote reverse-step not supported.")); if (!step && remote_protocol_packets[PACKET_bc].support == PACKET_DISABLE) error (_("Remote reverse-continue not supported.")); strcpy (buf, step ? "bs" : "bc"); } else if (siggnal != TARGET_SIGNAL_0) { buf[0] = step ? 'S' : 'C'; buf[1] = tohex (((int) siggnal >> 4) & 0xf); buf[2] = tohex (((int) siggnal) & 0xf); buf[3] = '\0'; } else strcpy (buf, step ? "s" : "c"); putpkt (buf); done: /* We are about to start executing the inferior, let's register it with the event loop. NOTE: this is the one place where all the execution commands end up. We could alternatively do this in each of the execution commands in infcmd.c. */ /* FIXME: ezannoni 1999-09-28: We may need to move this out of here into infcmd.c in order to allow inferior function calls to work NOT asynchronously. */ if (target_can_async_p ()) target_async (inferior_event_handler, 0); /* We've just told the target to resume. The remote server will wait for the inferior to stop, and then send a stop reply. In the mean time, we can't start another command/query ourselves because the stub wouldn't be ready to process it. This applies only to the base all-stop protocol, however. In non-stop (which only supports vCont), the stub replies with an "OK", and is immediate able to process further serial input. */ if (!non_stop) rs->waiting_for_stop_reply = 1; } /* Set up the signal handler for SIGINT, while the target is executing, ovewriting the 'regular' SIGINT signal handler. */ static void initialize_sigint_signal_handler (void) { signal (SIGINT, handle_remote_sigint); } /* Signal handler for SIGINT, while the target is executing. */ static void handle_remote_sigint (int sig) { signal (sig, handle_remote_sigint_twice); mark_async_signal_handler_wrapper (sigint_remote_token); } /* Signal handler for SIGINT, installed after SIGINT has already been sent once. It will take effect the second time that the user sends a ^C. */ static void handle_remote_sigint_twice (int sig) { signal (sig, handle_remote_sigint); mark_async_signal_handler_wrapper (sigint_remote_twice_token); } /* Perform the real interruption of the target execution, in response to a ^C. */ static void async_remote_interrupt (gdb_client_data arg) { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "remote_interrupt called\n"); target_stop (inferior_ptid); } /* Perform interrupt, if the first attempt did not succeed. Just give up on the target alltogether. */ void async_remote_interrupt_twice (gdb_client_data arg) { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "remote_interrupt_twice called\n"); interrupt_query (); } /* Reinstall the usual SIGINT handlers, after the target has stopped. */ static void cleanup_sigint_signal_handler (void *dummy) { signal (SIGINT, handle_sigint); } /* Send ^C to target to halt it. Target will respond, and send us a packet. */ static void (*ofunc) (int); /* The command line interface's stop routine. This function is installed as a signal handler for SIGINT. The first time a user requests a stop, we call remote_stop to send a break or ^C. If there is no response from the target (it didn't stop when the user requested it), we ask the user if he'd like to detach from the target. */ static void remote_interrupt (int signo) { /* If this doesn't work, try more severe steps. */ signal (signo, remote_interrupt_twice); gdb_call_async_signal_handler (sigint_remote_token, 1); } /* The user typed ^C twice. */ static void remote_interrupt_twice (int signo) { signal (signo, ofunc); gdb_call_async_signal_handler (sigint_remote_twice_token, 1); signal (signo, remote_interrupt); } /* Non-stop version of target_stop. Uses `vCont;t' to stop a remote thread, all threads of a remote process, or all threads of all processes. */ static void remote_stop_ns (ptid_t ptid) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; char *endp = rs->buf + get_remote_packet_size (); if (remote_protocol_packets[PACKET_vCont].support == PACKET_SUPPORT_UNKNOWN) remote_vcont_probe (rs); if (!rs->support_vCont_t) error (_("Remote server does not support stopping threads")); if (ptid_equal (ptid, minus_one_ptid) || (!remote_multi_process_p (rs) && ptid_is_pid (ptid))) p += xsnprintf (p, endp - p, "vCont;t"); else { ptid_t nptid; p += xsnprintf (p, endp - p, "vCont;t:"); if (ptid_is_pid (ptid)) /* All (-1) threads of process. */ nptid = ptid_build (ptid_get_pid (ptid), 0, -1); else { /* Small optimization: if we already have a stop reply for this thread, no use in telling the stub we want this stopped. */ if (peek_stop_reply (ptid)) return; nptid = ptid; } p = write_ptid (p, endp, nptid); } /* In non-stop, we get an immediate OK reply. The stop reply will come in asynchronously by notification. */ putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (strcmp (rs->buf, "OK") != 0) error (_("Stopping %s failed: %s"), target_pid_to_str (ptid), rs->buf); } /* All-stop version of target_stop. Sends a break or a ^C to stop the remote target. It is undefined which thread of which process reports the stop. */ static void remote_stop_as (ptid_t ptid) { struct remote_state *rs = get_remote_state (); rs->ctrlc_pending_p = 1; /* If the inferior is stopped already, but the core didn't know about it yet, just ignore the request. The cached wait status will be collected in remote_wait. */ if (rs->cached_wait_status) return; /* Send interrupt_sequence to remote target. */ send_interrupt_sequence (); } /* This is the generic stop called via the target vector. When a target interrupt is requested, either by the command line or the GUI, we will eventually end up here. */ static void remote_stop (ptid_t ptid) { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "remote_stop called\n"); if (non_stop) remote_stop_ns (ptid); else remote_stop_as (ptid); } /* Ask the user what to do when an interrupt is received. */ static void interrupt_query (void) { target_terminal_ours (); if (target_can_async_p ()) { signal (SIGINT, handle_sigint); deprecated_throw_reason (RETURN_QUIT); } else { if (query (_("Interrupted while waiting for the program.\n\ Give up (and stop debugging it)? "))) { pop_target (); deprecated_throw_reason (RETURN_QUIT); } } target_terminal_inferior (); } /* Enable/disable target terminal ownership. Most targets can use terminal groups to control terminal ownership. Remote targets are different in that explicit transfer of ownership to/from GDB/target is required. */ static void remote_terminal_inferior (void) { if (!target_async_permitted) /* Nothing to do. */ return; /* FIXME: cagney/1999-09-27: Make calls to target_terminal_*() idempotent. The event-loop GDB talking to an asynchronous target with a synchronous command calls this function from both event-top.c and infrun.c/infcmd.c. Once GDB stops trying to transfer the terminal to the target when it shouldn't this guard can go away. */ if (!remote_async_terminal_ours_p) return; delete_file_handler (input_fd); remote_async_terminal_ours_p = 0; initialize_sigint_signal_handler (); /* NOTE: At this point we could also register our selves as the recipient of all input. Any characters typed could then be passed on down to the target. */ } static void remote_terminal_ours (void) { if (!target_async_permitted) /* Nothing to do. */ return; /* See FIXME in remote_terminal_inferior. */ if (remote_async_terminal_ours_p) return; cleanup_sigint_signal_handler (NULL); add_file_handler (input_fd, stdin_event_handler, 0); remote_async_terminal_ours_p = 1; } void remote_console_output (char *msg) { char *p; for (p = msg; p[0] && p[1]; p += 2) { char tb[2]; char c = fromhex (p[0]) * 16 + fromhex (p[1]); tb[0] = c; tb[1] = 0; fputs_unfiltered (tb, gdb_stdtarg); } gdb_flush (gdb_stdtarg); } typedef struct cached_reg { int num; gdb_byte data[MAX_REGISTER_SIZE]; } cached_reg_t; DEF_VEC_O(cached_reg_t); struct stop_reply { struct stop_reply *next; ptid_t ptid; struct target_waitstatus ws; VEC(cached_reg_t) *regcache; int stopped_by_watchpoint_p; CORE_ADDR watch_data_address; int solibs_changed; int replay_event; int core; }; /* The list of already fetched and acknowledged stop events. */ static struct stop_reply *stop_reply_queue; static struct stop_reply * stop_reply_xmalloc (void) { struct stop_reply *r = XMALLOC (struct stop_reply); r->next = NULL; return r; } static void stop_reply_xfree (struct stop_reply *r) { if (r != NULL) { VEC_free (cached_reg_t, r->regcache); xfree (r); } } /* Discard all pending stop replies of inferior PID. If PID is -1, discard everything. */ static void discard_pending_stop_replies (int pid) { struct stop_reply *prev = NULL, *reply, *next; /* Discard the in-flight notification. */ if (pending_stop_reply != NULL && (pid == -1 || ptid_get_pid (pending_stop_reply->ptid) == pid)) { stop_reply_xfree (pending_stop_reply); pending_stop_reply = NULL; } /* Discard the stop replies we have already pulled with vStopped. */ for (reply = stop_reply_queue; reply; reply = next) { next = reply->next; if (pid == -1 || ptid_get_pid (reply->ptid) == pid) { if (reply == stop_reply_queue) stop_reply_queue = reply->next; else prev->next = reply->next; stop_reply_xfree (reply); } else prev = reply; } } /* Cleanup wrapper. */ static void do_stop_reply_xfree (void *arg) { struct stop_reply *r = arg; stop_reply_xfree (r); } /* Look for a queued stop reply belonging to PTID. If one is found, remove it from the queue, and return it. Returns NULL if none is found. If there are still queued events left to process, tell the event loop to get back to target_wait soon. */ static struct stop_reply * queued_stop_reply (ptid_t ptid) { struct stop_reply *it, *prev; struct stop_reply head; head.next = stop_reply_queue; prev = &head; it = head.next; if (!ptid_equal (ptid, minus_one_ptid)) for (; it; prev = it, it = it->next) if (ptid_equal (ptid, it->ptid)) break; if (it) { prev->next = it->next; it->next = NULL; } stop_reply_queue = head.next; if (stop_reply_queue) /* There's still at least an event left. */ mark_async_event_handler (remote_async_inferior_event_token); return it; } /* Push a fully parsed stop reply in the stop reply queue. Since we know that we now have at least one queued event left to pass to the core side, tell the event loop to get back to target_wait soon. */ static void push_stop_reply (struct stop_reply *new_event) { struct stop_reply *event; if (stop_reply_queue) { for (event = stop_reply_queue; event && event->next; event = event->next) ; event->next = new_event; } else stop_reply_queue = new_event; mark_async_event_handler (remote_async_inferior_event_token); } /* Returns true if we have a stop reply for PTID. */ static int peek_stop_reply (ptid_t ptid) { struct stop_reply *it; for (it = stop_reply_queue; it; it = it->next) if (ptid_equal (ptid, it->ptid)) { if (it->ws.kind == TARGET_WAITKIND_STOPPED) return 1; } return 0; } /* Parse the stop reply in BUF. Either the function succeeds, and the result is stored in EVENT, or throws an error. */ static void remote_parse_stop_reply (char *buf, struct stop_reply *event) { struct remote_arch_state *rsa = get_remote_arch_state (); ULONGEST addr; char *p; event->ptid = null_ptid; event->ws.kind = TARGET_WAITKIND_IGNORE; event->ws.value.integer = 0; event->solibs_changed = 0; event->replay_event = 0; event->stopped_by_watchpoint_p = 0; event->regcache = NULL; event->core = -1; switch (buf[0]) { case 'T': /* Status with PC, SP, FP, ... */ /* Expedited reply, containing Signal, {regno, reg} repeat. */ /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where ss = signal number n... = register number r... = register contents */ p = &buf[3]; /* after Txx */ while (*p) { char *p1; char *p_temp; int fieldsize; LONGEST pnum = 0; /* If the packet contains a register number, save it in pnum and set p1 to point to the character following it. Otherwise p1 points to p. */ /* If this packet is an awatch packet, don't parse the 'a' as a register number. */ if (strncmp (p, "awatch", strlen("awatch")) != 0 && strncmp (p, "core", strlen ("core") != 0)) { /* Read the ``P'' register number. */ pnum = strtol (p, &p_temp, 16); p1 = p_temp; } else p1 = p; if (p1 == p) /* No register number present here. */ { p1 = strchr (p, ':'); if (p1 == NULL) error (_("Malformed packet(a) (missing colon): %s\n\ Packet: '%s'\n"), p, buf); if (strncmp (p, "thread", p1 - p) == 0) event->ptid = read_ptid (++p1, &p); else if ((strncmp (p, "watch", p1 - p) == 0) || (strncmp (p, "rwatch", p1 - p) == 0) || (strncmp (p, "awatch", p1 - p) == 0)) { event->stopped_by_watchpoint_p = 1; p = unpack_varlen_hex (++p1, &addr); event->watch_data_address = (CORE_ADDR) addr; } else if (strncmp (p, "library", p1 - p) == 0) { p1++; p_temp = p1; while (*p_temp && *p_temp != ';') p_temp++; event->solibs_changed = 1; p = p_temp; } else if (strncmp (p, "replaylog", p1 - p) == 0) { /* NO_HISTORY event. p1 will indicate "begin" or "end", but it makes no difference for now, so ignore it. */ event->replay_event = 1; p_temp = strchr (p1 + 1, ';'); if (p_temp) p = p_temp; } else if (strncmp (p, "core", p1 - p) == 0) { ULONGEST c; p = unpack_varlen_hex (++p1, &c); event->core = c; } else { /* Silently skip unknown optional info. */ p_temp = strchr (p1 + 1, ';'); if (p_temp) p = p_temp; } } else { struct packet_reg *reg = packet_reg_from_pnum (rsa, pnum); cached_reg_t cached_reg; p = p1; if (*p != ':') error (_("Malformed packet(b) (missing colon): %s\n\ Packet: '%s'\n"), p, buf); ++p; if (reg == NULL) error (_("Remote sent bad register number %s: %s\n\ Packet: '%s'\n"), phex_nz (pnum, 0), p, buf); cached_reg.num = reg->regnum; fieldsize = hex2bin (p, cached_reg.data, register_size (target_gdbarch, reg->regnum)); p += 2 * fieldsize; if (fieldsize < register_size (target_gdbarch, reg->regnum)) warning (_("Remote reply is too short: %s"), buf); VEC_safe_push (cached_reg_t, event->regcache, &cached_reg); } if (*p != ';') error (_("Remote register badly formatted: %s\nhere: %s"), buf, p); ++p; } /* fall through */ case 'S': /* Old style status, just signal only. */ if (event->solibs_changed) event->ws.kind = TARGET_WAITKIND_LOADED; else if (event->replay_event) event->ws.kind = TARGET_WAITKIND_NO_HISTORY; else { event->ws.kind = TARGET_WAITKIND_STOPPED; event->ws.value.sig = (enum target_signal) (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); } break; case 'W': /* Target exited. */ case 'X': { char *p; int pid; ULONGEST value; /* GDB used to accept only 2 hex chars here. Stubs should only send more if they detect GDB supports multi-process support. */ p = unpack_varlen_hex (&buf[1], &value); if (buf[0] == 'W') { /* The remote process exited. */ event->ws.kind = TARGET_WAITKIND_EXITED; event->ws.value.integer = value; } else { /* The remote process exited with a signal. */ event->ws.kind = TARGET_WAITKIND_SIGNALLED; event->ws.value.sig = (enum target_signal) value; } /* If no process is specified, assume inferior_ptid. */ pid = ptid_get_pid (inferior_ptid); if (*p == '\0') ; else if (*p == ';') { p++; if (p == '\0') ; else if (strncmp (p, "process:", sizeof ("process:") - 1) == 0) { ULONGEST upid; p += sizeof ("process:") - 1; unpack_varlen_hex (p, &upid); pid = upid; } else error (_("unknown stop reply packet: %s"), buf); } else error (_("unknown stop reply packet: %s"), buf); event->ptid = pid_to_ptid (pid); } break; } if (non_stop && ptid_equal (event->ptid, null_ptid)) error (_("No process or thread specified in stop reply: %s"), buf); } /* When the stub wants to tell GDB about a new stop reply, it sends a stop notification (%Stop). Those can come it at any time, hence, we have to make sure that any pending putpkt/getpkt sequence we're making is finished, before querying the stub for more events with vStopped. E.g., if we started a vStopped sequence immediatelly upon receiving the %Stop notification, something like this could happen: 1.1) --> Hg 1 1.2) <-- OK 1.3) --> g 1.4) <-- %Stop 1.5) --> vStopped 1.6) <-- (registers reply to step #1.3) Obviously, the reply in step #1.6 would be unexpected to a vStopped query. To solve this, whenever we parse a %Stop notification sucessfully, we mark the REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN, and carry on doing whatever we were doing: 2.1) --> Hg 1 2.2) <-- OK 2.3) --> g 2.4) <-- %Stop <GDB marks the REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN> 2.5) <-- (registers reply to step #2.3) Eventualy after step #2.5, we return to the event loop, which notices there's an event on the REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN event and calls the associated callback --- the function below. At this point, we're always safe to start a vStopped sequence. : 2.6) --> vStopped 2.7) <-- T05 thread:2 2.8) --> vStopped 2.9) --> OK */ static void remote_get_pending_stop_replies (void) { struct remote_state *rs = get_remote_state (); if (pending_stop_reply) { /* acknowledge */ putpkt ("vStopped"); /* Now we can rely on it. */ push_stop_reply (pending_stop_reply); pending_stop_reply = NULL; while (1) { getpkt (&rs->buf, &rs->buf_size, 0); if (strcmp (rs->buf, "OK") == 0) break; else { struct cleanup *old_chain; struct stop_reply *stop_reply = stop_reply_xmalloc (); old_chain = make_cleanup (do_stop_reply_xfree, stop_reply); remote_parse_stop_reply (rs->buf, stop_reply); /* acknowledge */ putpkt ("vStopped"); if (stop_reply->ws.kind != TARGET_WAITKIND_IGNORE) { /* Now we can rely on it. */ discard_cleanups (old_chain); push_stop_reply (stop_reply); } else /* We got an unknown stop reply. */ do_cleanups (old_chain); } } } } /* Called when it is decided that STOP_REPLY holds the info of the event that is to be returned to the core. This function always destroys STOP_REPLY. */ static ptid_t process_stop_reply (struct stop_reply *stop_reply, struct target_waitstatus *status) { ptid_t ptid; struct thread_info *info; *status = stop_reply->ws; ptid = stop_reply->ptid; /* If no thread/process was reported by the stub, assume the current inferior. */ if (ptid_equal (ptid, null_ptid)) ptid = inferior_ptid; if (status->kind != TARGET_WAITKIND_EXITED && status->kind != TARGET_WAITKIND_SIGNALLED) { /* Expedited registers. */ if (stop_reply->regcache) { struct regcache *regcache = get_thread_arch_regcache (ptid, target_gdbarch); cached_reg_t *reg; int ix; for (ix = 0; VEC_iterate(cached_reg_t, stop_reply->regcache, ix, reg); ix++) regcache_raw_supply (regcache, reg->num, reg->data); VEC_free (cached_reg_t, stop_reply->regcache); } remote_stopped_by_watchpoint_p = stop_reply->stopped_by_watchpoint_p; remote_watch_data_address = stop_reply->watch_data_address; remote_notice_new_inferior (ptid, 0); demand_private_info (ptid)->core = stop_reply->core; } stop_reply_xfree (stop_reply); return ptid; } /* The non-stop mode version of target_wait. */ static ptid_t remote_wait_ns (ptid_t ptid, struct target_waitstatus *status, int options) { struct remote_state *rs = get_remote_state (); struct stop_reply *stop_reply; int ret; /* If in non-stop mode, get out of getpkt even if a notification is received. */ ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size, 0 /* forever */); while (1) { if (ret != -1) switch (rs->buf[0]) { case 'E': /* Error of some sort. */ /* We're out of sync with the target now. Did it continue or not? We can't tell which thread it was in non-stop, so just ignore this. */ warning (_("Remote failure reply: %s"), rs->buf); break; case 'O': /* Console output. */ remote_console_output (rs->buf + 1); break; default: warning (_("Invalid remote reply: %s"), rs->buf); break; } /* Acknowledge a pending stop reply that may have arrived in the mean time. */ if (pending_stop_reply != NULL) remote_get_pending_stop_replies (); /* If indeed we noticed a stop reply, we're done. */ stop_reply = queued_stop_reply (ptid); if (stop_reply != NULL) return process_stop_reply (stop_reply, status); /* Still no event. If we're just polling for an event, then return to the event loop. */ if (options & TARGET_WNOHANG) { status->kind = TARGET_WAITKIND_IGNORE; return minus_one_ptid; } /* Otherwise do a blocking wait. */ ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size, 1 /* forever */); } } /* Wait until the remote machine stops, then return, storing status in STATUS just as `wait' would. */ static ptid_t remote_wait_as (ptid_t ptid, struct target_waitstatus *status, int options) { struct remote_state *rs = get_remote_state (); ptid_t event_ptid = null_ptid; char *buf; struct stop_reply *stop_reply; again: status->kind = TARGET_WAITKIND_IGNORE; status->value.integer = 0; stop_reply = queued_stop_reply (ptid); if (stop_reply != NULL) return process_stop_reply (stop_reply, status); if (rs->cached_wait_status) /* Use the cached wait status, but only once. */ rs->cached_wait_status = 0; else { int ret; if (!target_is_async_p ()) { ofunc = signal (SIGINT, remote_interrupt); /* If the user hit C-c before this packet, or between packets, pretend that it was hit right here. */ if (quit_flag) { quit_flag = 0; remote_interrupt (SIGINT); } } /* FIXME: cagney/1999-09-27: If we're in async mode we should _never_ wait for ever -> test on target_is_async_p(). However, before we do that we need to ensure that the caller knows how to take the target into/out of async mode. */ ret = getpkt_sane (&rs->buf, &rs->buf_size, wait_forever_enabled_p); if (!target_is_async_p ()) signal (SIGINT, ofunc); } buf = rs->buf; remote_stopped_by_watchpoint_p = 0; /* We got something. */ rs->waiting_for_stop_reply = 0; /* Assume that the target has acknowledged Ctrl-C unless we receive an 'F' or 'O' packet. */ if (buf[0] != 'F' && buf[0] != 'O') rs->ctrlc_pending_p = 0; switch (buf[0]) { case 'E': /* Error of some sort. */ /* We're out of sync with the target now. Did it continue or not? Not is more likely, so report a stop. */ warning (_("Remote failure reply: %s"), buf); status->kind = TARGET_WAITKIND_STOPPED; status->value.sig = TARGET_SIGNAL_0; break; case 'F': /* File-I/O request. */ remote_fileio_request (buf, rs->ctrlc_pending_p); rs->ctrlc_pending_p = 0; break; case 'T': case 'S': case 'X': case 'W': { struct stop_reply *stop_reply; struct cleanup *old_chain; stop_reply = stop_reply_xmalloc (); old_chain = make_cleanup (do_stop_reply_xfree, stop_reply); remote_parse_stop_reply (buf, stop_reply); discard_cleanups (old_chain); event_ptid = process_stop_reply (stop_reply, status); break; } case 'O': /* Console output. */ remote_console_output (buf + 1); /* The target didn't really stop; keep waiting. */ rs->waiting_for_stop_reply = 1; break; case '\0': if (last_sent_signal != TARGET_SIGNAL_0) { /* Zero length reply means that we tried 'S' or 'C' and the remote system doesn't support it. */ target_terminal_ours_for_output (); printf_filtered ("Can't send signals to this remote system. %s not sent.\n", target_signal_to_name (last_sent_signal)); last_sent_signal = TARGET_SIGNAL_0; target_terminal_inferior (); strcpy ((char *) buf, last_sent_step ? "s" : "c"); putpkt ((char *) buf); /* We just told the target to resume, so a stop reply is in order. */ rs->waiting_for_stop_reply = 1; break; } /* else fallthrough */ default: warning (_("Invalid remote reply: %s"), buf); /* Keep waiting. */ rs->waiting_for_stop_reply = 1; break; } if (status->kind == TARGET_WAITKIND_IGNORE) { /* Nothing interesting happened. If we're doing a non-blocking poll, we're done. Otherwise, go back to waiting. */ if (options & TARGET_WNOHANG) return minus_one_ptid; else goto again; } else if (status->kind != TARGET_WAITKIND_EXITED && status->kind != TARGET_WAITKIND_SIGNALLED) { if (!ptid_equal (event_ptid, null_ptid)) record_currthread (event_ptid); else event_ptid = inferior_ptid; } else /* A process exit. Invalidate our notion of current thread. */ record_currthread (minus_one_ptid); return event_ptid; } /* Wait until the remote machine stops, then return, storing status in STATUS just as `wait' would. */ static ptid_t remote_wait (struct target_ops *ops, ptid_t ptid, struct target_waitstatus *status, int options) { ptid_t event_ptid; if (non_stop) event_ptid = remote_wait_ns (ptid, status, options); else event_ptid = remote_wait_as (ptid, status, options); if (target_can_async_p ()) { /* If there are are events left in the queue tell the event loop to return here. */ if (stop_reply_queue) mark_async_event_handler (remote_async_inferior_event_token); } return event_ptid; } /* Fetch a single register using a 'p' packet. */ static int fetch_register_using_p (struct regcache *regcache, struct packet_reg *reg) { struct remote_state *rs = get_remote_state (); char *buf, *p; char regp[MAX_REGISTER_SIZE]; int i; if (remote_protocol_packets[PACKET_p].support == PACKET_DISABLE) return 0; if (reg->pnum == -1) return 0; p = rs->buf; *p++ = 'p'; p += hexnumstr (p, reg->pnum); *p++ = '\0'; putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); buf = rs->buf; switch (packet_ok (buf, &remote_protocol_packets[PACKET_p])) { case PACKET_OK: break; case PACKET_UNKNOWN: return 0; case PACKET_ERROR: error (_("Could not fetch register \"%s\"; remote failure reply '%s'"), gdbarch_register_name (get_regcache_arch (regcache), reg->regnum), buf); } /* If this register is unfetchable, tell the regcache. */ if (buf[0] == 'x') { regcache_raw_supply (regcache, reg->regnum, NULL); return 1; } /* Otherwise, parse and supply the value. */ p = buf; i = 0; while (p[0] != 0) { if (p[1] == 0) error (_("fetch_register_using_p: early buf termination")); regp[i++] = fromhex (p[0]) * 16 + fromhex (p[1]); p += 2; } regcache_raw_supply (regcache, reg->regnum, regp); return 1; } /* Fetch the registers included in the target's 'g' packet. */ static int send_g_packet (void) { struct remote_state *rs = get_remote_state (); int buf_len; sprintf (rs->buf, "g"); remote_send (&rs->buf, &rs->buf_size); /* We can get out of synch in various cases. If the first character in the buffer is not a hex character, assume that has happened and try to fetch another packet to read. */ while ((rs->buf[0] < '0' || rs->buf[0] > '9') && (rs->buf[0] < 'A' || rs->buf[0] > 'F') && (rs->buf[0] < 'a' || rs->buf[0] > 'f') && rs->buf[0] != 'x') /* New: unavailable register value. */ { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Bad register packet; fetching a new packet\n"); getpkt (&rs->buf, &rs->buf_size, 0); } buf_len = strlen (rs->buf); /* Sanity check the received packet. */ if (buf_len % 2 != 0) error (_("Remote 'g' packet reply is of odd length: %s"), rs->buf); return buf_len / 2; } static void process_g_packet (struct regcache *regcache) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct remote_state *rs = get_remote_state (); struct remote_arch_state *rsa = get_remote_arch_state (); int i, buf_len; char *p; char *regs; buf_len = strlen (rs->buf); /* Further sanity checks, with knowledge of the architecture. */ if (buf_len > 2 * rsa->sizeof_g_packet) error (_("Remote 'g' packet reply is too long: %s"), rs->buf); /* Save the size of the packet sent to us by the target. It is used as a heuristic when determining the max size of packets that the target can safely receive. */ if (rsa->actual_register_packet_size == 0) rsa->actual_register_packet_size = buf_len; /* If this is smaller than we guessed the 'g' packet would be, update our records. A 'g' reply that doesn't include a register's value implies either that the register is not available, or that the 'p' packet must be used. */ if (buf_len < 2 * rsa->sizeof_g_packet) { rsa->sizeof_g_packet = buf_len / 2; for (i = 0; i < gdbarch_num_regs (gdbarch); i++) { if (rsa->regs[i].pnum == -1) continue; if (rsa->regs[i].offset >= rsa->sizeof_g_packet) rsa->regs[i].in_g_packet = 0; else rsa->regs[i].in_g_packet = 1; } } regs = alloca (rsa->sizeof_g_packet); /* Unimplemented registers read as all bits zero. */ memset (regs, 0, rsa->sizeof_g_packet); /* Reply describes registers byte by byte, each byte encoded as two hex characters. Suck them all up, then supply them to the register cacheing/storage mechanism. */ p = rs->buf; for (i = 0; i < rsa->sizeof_g_packet; i++) { if (p[0] == 0 || p[1] == 0) /* This shouldn't happen - we adjusted sizeof_g_packet above. */ internal_error (__FILE__, __LINE__, "unexpected end of 'g' packet reply"); if (p[0] == 'x' && p[1] == 'x') regs[i] = 0; /* 'x' */ else regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); p += 2; } { int i; for (i = 0; i < gdbarch_num_regs (gdbarch); i++) { struct packet_reg *r = &rsa->regs[i]; if (r->in_g_packet) { if (r->offset * 2 >= strlen (rs->buf)) /* This shouldn't happen - we adjusted in_g_packet above. */ internal_error (__FILE__, __LINE__, "unexpected end of 'g' packet reply"); else if (rs->buf[r->offset * 2] == 'x') { gdb_assert (r->offset * 2 < strlen (rs->buf)); /* The register isn't available, mark it as such (at the same time setting the value to zero). */ regcache_raw_supply (regcache, r->regnum, NULL); } else regcache_raw_supply (regcache, r->regnum, regs + r->offset); } } } } static void fetch_registers_using_g (struct regcache *regcache) { send_g_packet (); process_g_packet (regcache); } static void remote_fetch_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { struct remote_arch_state *rsa = get_remote_arch_state (); int i; set_general_thread (inferior_ptid); if (regnum >= 0) { struct packet_reg *reg = packet_reg_from_regnum (rsa, regnum); gdb_assert (reg != NULL); /* If this register might be in the 'g' packet, try that first - we are likely to read more than one register. If this is the first 'g' packet, we might be overly optimistic about its contents, so fall back to 'p'. */ if (reg->in_g_packet) { fetch_registers_using_g (regcache); if (reg->in_g_packet) return; } if (fetch_register_using_p (regcache, reg)) return; /* This register is not available. */ regcache_raw_supply (regcache, reg->regnum, NULL); return; } fetch_registers_using_g (regcache); for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) if (!rsa->regs[i].in_g_packet) if (!fetch_register_using_p (regcache, &rsa->regs[i])) { /* This register is not available. */ regcache_raw_supply (regcache, i, NULL); } } /* Prepare to store registers. Since we may send them all (using a 'G' request), we have to read out the ones we don't want to change first. */ static void remote_prepare_to_store (struct regcache *regcache) { struct remote_arch_state *rsa = get_remote_arch_state (); int i; gdb_byte buf[MAX_REGISTER_SIZE]; /* Make sure the entire registers array is valid. */ switch (remote_protocol_packets[PACKET_P].support) { case PACKET_DISABLE: case PACKET_SUPPORT_UNKNOWN: /* Make sure all the necessary registers are cached. */ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) if (rsa->regs[i].in_g_packet) regcache_raw_read (regcache, rsa->regs[i].regnum, buf); break; case PACKET_ENABLE: break; } } /* Helper: Attempt to store REGNUM using the P packet. Return fail IFF packet was not recognized. */ static int store_register_using_P (const struct regcache *regcache, struct packet_reg *reg) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct remote_state *rs = get_remote_state (); /* Try storing a single register. */ char *buf = rs->buf; gdb_byte regp[MAX_REGISTER_SIZE]; char *p; if (remote_protocol_packets[PACKET_P].support == PACKET_DISABLE) return 0; if (reg->pnum == -1) return 0; xsnprintf (buf, get_remote_packet_size (), "P%s=", phex_nz (reg->pnum, 0)); p = buf + strlen (buf); regcache_raw_collect (regcache, reg->regnum, regp); bin2hex (regp, p, register_size (gdbarch, reg->regnum)); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_P])) { case PACKET_OK: return 1; case PACKET_ERROR: error (_("Could not write register \"%s\"; remote failure reply '%s'"), gdbarch_register_name (gdbarch, reg->regnum), rs->buf); case PACKET_UNKNOWN: return 0; default: internal_error (__FILE__, __LINE__, _("Bad result from packet_ok")); } } /* Store register REGNUM, or all registers if REGNUM == -1, from the contents of the register cache buffer. FIXME: ignores errors. */ static void store_registers_using_G (const struct regcache *regcache) { struct remote_state *rs = get_remote_state (); struct remote_arch_state *rsa = get_remote_arch_state (); gdb_byte *regs; char *p; /* Extract all the registers in the regcache copying them into a local buffer. */ { int i; regs = alloca (rsa->sizeof_g_packet); memset (regs, 0, rsa->sizeof_g_packet); for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) { struct packet_reg *r = &rsa->regs[i]; if (r->in_g_packet) regcache_raw_collect (regcache, r->regnum, regs + r->offset); } } /* Command describes registers byte by byte, each byte encoded as two hex characters. */ p = rs->buf; *p++ = 'G'; /* remote_prepare_to_store insures that rsa->sizeof_g_packet gets updated. */ bin2hex (regs, p, rsa->sizeof_g_packet); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (packet_check_result (rs->buf) == PACKET_ERROR) error (_("Could not write registers; remote failure reply '%s'"), rs->buf); } /* Store register REGNUM, or all registers if REGNUM == -1, from the contents of the register cache buffer. FIXME: ignores errors. */ static void remote_store_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { struct remote_arch_state *rsa = get_remote_arch_state (); int i; set_general_thread (inferior_ptid); if (regnum >= 0) { struct packet_reg *reg = packet_reg_from_regnum (rsa, regnum); gdb_assert (reg != NULL); /* Always prefer to store registers using the 'P' packet if possible; we often change only a small number of registers. Sometimes we change a larger number; we'd need help from a higher layer to know to use 'G'. */ if (store_register_using_P (regcache, reg)) return; /* For now, don't complain if we have no way to write the register. GDB loses track of unavailable registers too easily. Some day, this may be an error. We don't have any way to read the register, either... */ if (!reg->in_g_packet) return; store_registers_using_G (regcache); return; } store_registers_using_G (regcache); for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) if (!rsa->regs[i].in_g_packet) if (!store_register_using_P (regcache, &rsa->regs[i])) /* See above for why we do not issue an error here. */ continue; } /* Return the number of hex digits in num. */ static int hexnumlen (ULONGEST num) { int i; for (i = 0; num != 0; i++) num >>= 4; return max (i, 1); } /* Set BUF to the minimum number of hex digits representing NUM. */ static int hexnumstr (char *buf, ULONGEST num) { int len = hexnumlen (num); return hexnumnstr (buf, num, len); } /* Set BUF to the hex digits representing NUM, padded to WIDTH characters. */ static int hexnumnstr (char *buf, ULONGEST num, int width) { int i; buf[width] = '\0'; for (i = width - 1; i >= 0; i--) { buf[i] = "0123456789abcdef"[(num & 0xf)]; num >>= 4; } return width; } /* Mask all but the least significant REMOTE_ADDRESS_SIZE bits. */ static CORE_ADDR remote_address_masked (CORE_ADDR addr) { int address_size = remote_address_size; /* If "remoteaddresssize" was not set, default to target address size. */ if (!address_size) address_size = gdbarch_addr_bit (target_gdbarch); if (address_size > 0 && address_size < (sizeof (ULONGEST) * 8)) { /* Only create a mask when that mask can safely be constructed in a ULONGEST variable. */ ULONGEST mask = 1; mask = (mask << address_size) - 1; addr &= mask; } return addr; } /* Convert BUFFER, binary data at least LEN bytes long, into escaped binary data in OUT_BUF. Set *OUT_LEN to the length of the data encoded in OUT_BUF, and return the number of bytes in OUT_BUF (which may be more than *OUT_LEN due to escape characters). The total number of bytes in the output buffer will be at most OUT_MAXLEN. */ static int remote_escape_output (const gdb_byte *buffer, int len, gdb_byte *out_buf, int *out_len, int out_maxlen) { int input_index, output_index; output_index = 0; for (input_index = 0; input_index < len; input_index++) { gdb_byte b = buffer[input_index]; if (b == '$' || b == '#' || b == '}') { /* These must be escaped. */ if (output_index + 2 > out_maxlen) break; out_buf[output_index++] = '}'; out_buf[output_index++] = b ^ 0x20; } else { if (output_index + 1 > out_maxlen) break; out_buf[output_index++] = b; } } *out_len = input_index; return output_index; } /* Convert BUFFER, escaped data LEN bytes long, into binary data in OUT_BUF. Return the number of bytes written to OUT_BUF. Raise an error if the total number of bytes exceeds OUT_MAXLEN. This function reverses remote_escape_output. It allows more escaped characters than that function does, in particular because '*' must be escaped to avoid the run-length encoding processing in reading packets. */ static int remote_unescape_input (const gdb_byte *buffer, int len, gdb_byte *out_buf, int out_maxlen) { int input_index, output_index; int escaped; output_index = 0; escaped = 0; for (input_index = 0; input_index < len; input_index++) { gdb_byte b = buffer[input_index]; if (output_index + 1 > out_maxlen) { warning (_("Received too much data from remote target;" " ignoring overflow.")); return output_index; } if (escaped) { out_buf[output_index++] = b ^ 0x20; escaped = 0; } else if (b == '}') escaped = 1; else out_buf[output_index++] = b; } if (escaped) error (_("Unmatched escape character in target response.")); return output_index; } /* Determine whether the remote target supports binary downloading. This is accomplished by sending a no-op memory write of zero length to the target at the specified address. It does not suffice to send the whole packet, since many stubs strip the eighth bit and subsequently compute a wrong checksum, which causes real havoc with remote_write_bytes. NOTE: This can still lose if the serial line is not eight-bit clean. In cases like this, the user should clear "remote X-packet". */ static void check_binary_download (CORE_ADDR addr) { struct remote_state *rs = get_remote_state (); switch (remote_protocol_packets[PACKET_X].support) { case PACKET_DISABLE: break; case PACKET_ENABLE: break; case PACKET_SUPPORT_UNKNOWN: { char *p; p = rs->buf; *p++ = 'X'; p += hexnumstr (p, (ULONGEST) addr); *p++ = ','; p += hexnumstr (p, (ULONGEST) 0); *p++ = ':'; *p = '\0'; putpkt_binary (rs->buf, (int) (p - rs->buf)); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == '\0') { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "binary downloading NOT suppported by target\n"); remote_protocol_packets[PACKET_X].support = PACKET_DISABLE; } else { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "binary downloading suppported by target\n"); remote_protocol_packets[PACKET_X].support = PACKET_ENABLE; } break; } } } /* Write memory data directly to the remote machine. This does not inform the data cache; the data cache uses this. HEADER is the starting part of the packet. MEMADDR is the address in the remote memory space. MYADDR is the address of the buffer in our space. LEN is the number of bytes. PACKET_FORMAT should be either 'X' or 'M', and indicates if we should send data as binary ('X'), or hex-encoded ('M'). The function creates packet of the form <HEADER><ADDRESS>,<LENGTH>:<DATA> where encoding of <DATA> is termined by PACKET_FORMAT. If USE_LENGTH is 0, then the <LENGTH> field and the preceding comma are omitted. Returns the number of bytes transferred, or 0 (setting errno) for error. Only transfer a single packet. */ static int remote_write_bytes_aux (const char *header, CORE_ADDR memaddr, const gdb_byte *myaddr, int len, char packet_format, int use_length) { struct remote_state *rs = get_remote_state (); char *p; char *plen = NULL; int plenlen = 0; int todo; int nr_bytes; int payload_size; int payload_length; int header_length; if (packet_format != 'X' && packet_format != 'M') internal_error (__FILE__, __LINE__, "remote_write_bytes_aux: bad packet format"); if (len <= 0) return 0; payload_size = get_memory_write_packet_size (); /* The packet buffer will be large enough for the payload; get_memory_packet_size ensures this. */ rs->buf[0] = '\0'; /* Compute the size of the actual payload by subtracting out the packet header and footer overhead: "$M<memaddr>,<len>:...#nn". */ payload_size -= strlen ("$,:#NN"); if (!use_length) /* The comma won't be used. */ payload_size += 1; header_length = strlen (header); payload_size -= header_length; payload_size -= hexnumlen (memaddr); /* Construct the packet excluding the data: "<header><memaddr>,<len>:". */ strcat (rs->buf, header); p = rs->buf + strlen (header); /* Compute a best guess of the number of bytes actually transfered. */ if (packet_format == 'X') { /* Best guess at number of bytes that will fit. */ todo = min (len, payload_size); if (use_length) payload_size -= hexnumlen (todo); todo = min (todo, payload_size); } else { /* Num bytes that will fit. */ todo = min (len, payload_size / 2); if (use_length) payload_size -= hexnumlen (todo); todo = min (todo, payload_size / 2); } if (todo <= 0) internal_error (__FILE__, __LINE__, _("minumum packet size too small to write data")); /* If we already need another packet, then try to align the end of this packet to a useful boundary. */ if (todo > 2 * REMOTE_ALIGN_WRITES && todo < len) todo = ((memaddr + todo) & ~(REMOTE_ALIGN_WRITES - 1)) - memaddr; /* Append "<memaddr>". */ memaddr = remote_address_masked (memaddr); p += hexnumstr (p, (ULONGEST) memaddr); if (use_length) { /* Append ",". */ *p++ = ','; /* Append <len>. Retain the location/size of <len>. It may need to be adjusted once the packet body has been created. */ plen = p; plenlen = hexnumstr (p, (ULONGEST) todo); p += plenlen; } /* Append ":". */ *p++ = ':'; *p = '\0'; /* Append the packet body. */ if (packet_format == 'X') { /* Binary mode. Send target system values byte by byte, in increasing byte addresses. Only escape certain critical characters. */ payload_length = remote_escape_output (myaddr, todo, p, &nr_bytes, payload_size); /* If not all TODO bytes fit, then we'll need another packet. Make a second try to keep the end of the packet aligned. Don't do this if the packet is tiny. */ if (nr_bytes < todo && nr_bytes > 2 * REMOTE_ALIGN_WRITES) { int new_nr_bytes; new_nr_bytes = (((memaddr + nr_bytes) & ~(REMOTE_ALIGN_WRITES - 1)) - memaddr); if (new_nr_bytes != nr_bytes) payload_length = remote_escape_output (myaddr, new_nr_bytes, p, &nr_bytes, payload_size); } p += payload_length; if (use_length && nr_bytes < todo) { /* Escape chars have filled up the buffer prematurely, and we have actually sent fewer bytes than planned. Fix-up the length field of the packet. Use the same number of characters as before. */ plen += hexnumnstr (plen, (ULONGEST) nr_bytes, plenlen); *plen = ':'; /* overwrite \0 from hexnumnstr() */ } } else { /* Normal mode: Send target system values byte by byte, in increasing byte addresses. Each byte is encoded as a two hex value. */ nr_bytes = bin2hex (myaddr, p, todo); p += 2 * nr_bytes; } putpkt_binary (rs->buf, (int) (p - rs->buf)); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'E') { /* There is no correspondance between what the remote protocol uses for errors and errno codes. We would like a cleaner way of representing errors (big enough to include errno codes, bfd_error codes, and others). But for now just return EIO. */ errno = EIO; return 0; } /* Return NR_BYTES, not TODO, in case escape chars caused us to send fewer bytes than we'd planned. */ return nr_bytes; } /* Write memory data directly to the remote machine. This does not inform the data cache; the data cache uses this. MEMADDR is the address in the remote memory space. MYADDR is the address of the buffer in our space. LEN is the number of bytes. Returns number of bytes transferred, or 0 (setting errno) for error. Only transfer a single packet. */ int remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, int len) { char *packet_format = 0; /* Check whether the target supports binary download. */ check_binary_download (memaddr); switch (remote_protocol_packets[PACKET_X].support) { case PACKET_ENABLE: packet_format = "X"; break; case PACKET_DISABLE: packet_format = "M"; break; case PACKET_SUPPORT_UNKNOWN: internal_error (__FILE__, __LINE__, _("remote_write_bytes: bad internal state")); default: internal_error (__FILE__, __LINE__, _("bad switch")); } return remote_write_bytes_aux (packet_format, memaddr, myaddr, len, packet_format[0], 1); } /* Read memory data directly from the remote machine. This does not use the data cache; the data cache uses this. MEMADDR is the address in the remote memory space. MYADDR is the address of the buffer in our space. LEN is the number of bytes. Returns number of bytes transferred, or 0 for error. */ /* NOTE: cagney/1999-10-18: This function (and its siblings in other remote targets) shouldn't attempt to read the entire buffer. Instead it should read a single packet worth of data and then return the byte size of that packet to the caller. The caller (its caller and its callers caller ;-) already contains code for handling partial reads. */ int remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len) { struct remote_state *rs = get_remote_state (); int max_buf_size; /* Max size of packet output buffer. */ int origlen; if (len <= 0) return 0; max_buf_size = get_memory_read_packet_size (); /* The packet buffer will be large enough for the payload; get_memory_packet_size ensures this. */ origlen = len; while (len > 0) { char *p; int todo; int i; todo = min (len, max_buf_size / 2); /* num bytes that will fit */ /* construct "m"<memaddr>","<len>" */ /* sprintf (rs->buf, "m%lx,%x", (unsigned long) memaddr, todo); */ memaddr = remote_address_masked (memaddr); p = rs->buf; *p++ = 'm'; p += hexnumstr (p, (ULONGEST) memaddr); *p++ = ','; p += hexnumstr (p, (ULONGEST) todo); *p = '\0'; putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'E' && isxdigit (rs->buf[1]) && isxdigit (rs->buf[2]) && rs->buf[3] == '\0') { /* There is no correspondance between what the remote protocol uses for errors and errno codes. We would like a cleaner way of representing errors (big enough to include errno codes, bfd_error codes, and others). But for now just return EIO. */ errno = EIO; return 0; } /* Reply describes memory byte by byte, each byte encoded as two hex characters. */ p = rs->buf; if ((i = hex2bin (p, myaddr, todo)) < todo) { /* Reply is short. This means that we were able to read only part of what we wanted to. */ return i + (origlen - len); } myaddr += todo; memaddr += todo; len -= todo; } return origlen; } /* Remote notification handler. */ static void handle_notification (char *buf, size_t length) { if (strncmp (buf, "Stop:", 5) == 0) { if (pending_stop_reply) /* We've already parsed the in-flight stop-reply, but the stub for some reason thought we didn't, possibly due to timeout on its side. Just ignore it. */ ; else { struct cleanup *old_chain; struct stop_reply *reply = stop_reply_xmalloc (); old_chain = make_cleanup (do_stop_reply_xfree, reply); remote_parse_stop_reply (buf + 5, reply); discard_cleanups (old_chain); /* Be careful to only set it after parsing, since an error may be thrown then. */ pending_stop_reply = reply; /* Notify the event loop there's a stop reply to acknowledge and that there may be more events to fetch. */ mark_async_event_handler (remote_async_get_pending_events_token); } } else /* We ignore notifications we don't recognize, for compatibility with newer stubs. */ ; } /* Read or write LEN bytes from inferior memory at MEMADDR, transferring to or from debugger address BUFFER. Write to inferior if SHOULD_WRITE is nonzero. Returns length of data written or read; 0 for error. TARGET is unused. */ static int remote_xfer_memory (CORE_ADDR mem_addr, gdb_byte *buffer, int mem_len, int should_write, struct mem_attrib *attrib, struct target_ops *target) { int res; set_general_thread (inferior_ptid); if (should_write) res = remote_write_bytes (mem_addr, buffer, mem_len); else res = remote_read_bytes (mem_addr, buffer, mem_len); return res; } /* Sends a packet with content determined by the printf format string FORMAT and the remaining arguments, then gets the reply. Returns whether the packet was a success, a failure, or unknown. */ static enum packet_result remote_send_printf (const char *format, ...) { struct remote_state *rs = get_remote_state (); int max_size = get_remote_packet_size (); va_list ap; va_start (ap, format); rs->buf[0] = '\0'; if (vsnprintf (rs->buf, max_size, format, ap) >= max_size) internal_error (__FILE__, __LINE__, "Too long remote packet."); if (putpkt (rs->buf) < 0) error (_("Communication problem with target.")); rs->buf[0] = '\0'; getpkt (&rs->buf, &rs->buf_size, 0); return packet_check_result (rs->buf); } static void restore_remote_timeout (void *p) { int value = *(int *)p; remote_timeout = value; } /* Flash writing can take quite some time. We'll set effectively infinite timeout for flash operations. In future, we'll need to decide on a better approach. */ static const int remote_flash_timeout = 1000; static void remote_flash_erase (struct target_ops *ops, ULONGEST address, LONGEST length) { int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; int saved_remote_timeout = remote_timeout; enum packet_result ret; struct cleanup *back_to = make_cleanup (restore_remote_timeout, &saved_remote_timeout); remote_timeout = remote_flash_timeout; ret = remote_send_printf ("vFlashErase:%s,%s", phex (address, addr_size), phex (length, 4)); switch (ret) { case PACKET_UNKNOWN: error (_("Remote target does not support flash erase")); case PACKET_ERROR: error (_("Error erasing flash with vFlashErase packet")); default: break; } do_cleanups (back_to); } static LONGEST remote_flash_write (struct target_ops *ops, ULONGEST address, LONGEST length, const gdb_byte *data) { int saved_remote_timeout = remote_timeout; int ret; struct cleanup *back_to = make_cleanup (restore_remote_timeout, &saved_remote_timeout); remote_timeout = remote_flash_timeout; ret = remote_write_bytes_aux ("vFlashWrite:", address, data, length, 'X', 0); do_cleanups (back_to); return ret; } static void remote_flash_done (struct target_ops *ops) { int saved_remote_timeout = remote_timeout; int ret; struct cleanup *back_to = make_cleanup (restore_remote_timeout, &saved_remote_timeout); remote_timeout = remote_flash_timeout; ret = remote_send_printf ("vFlashDone"); do_cleanups (back_to); switch (ret) { case PACKET_UNKNOWN: error (_("Remote target does not support vFlashDone")); case PACKET_ERROR: error (_("Error finishing flash operation")); default: break; } } static void remote_files_info (struct target_ops *ignore) { puts_filtered ("Debugging a target over a serial line.\n"); } /* Stuff for dealing with the packets which are part of this protocol. See comment at top of file for details. */ /* Read a single character from the remote end. */ static int readchar (int timeout) { int ch; ch = serial_readchar (remote_desc, timeout); if (ch >= 0) return ch; switch ((enum serial_rc) ch) { case SERIAL_EOF: pop_target (); error (_("Remote connection closed")); /* no return */ case SERIAL_ERROR: perror_with_name (_("Remote communication error")); /* no return */ case SERIAL_TIMEOUT: break; } return ch; } /* Send the command in *BUF to the remote machine, and read the reply into *BUF. Report an error if we get an error reply. Resize *BUF using xrealloc if necessary to hold the result, and update *SIZEOF_BUF. */ static void remote_send (char **buf, long *sizeof_buf) { putpkt (*buf); getpkt (buf, sizeof_buf, 0); if ((*buf)[0] == 'E') error (_("Remote failure reply: %s"), *buf); } /* Return a pointer to an xmalloc'ed string representing an escaped version of BUF, of len N. E.g. \n is converted to \\n, \t to \\t, etc. The caller is responsible for releasing the returned memory. */ static char * escape_buffer (const char *buf, int n) { struct cleanup *old_chain; struct ui_file *stb; char *str; stb = mem_fileopen (); old_chain = make_cleanup_ui_file_delete (stb); fputstrn_unfiltered (buf, n, 0, stb); str = ui_file_xstrdup (stb, NULL); do_cleanups (old_chain); return str; } /* Display a null-terminated packet on stdout, for debugging, using C string notation. */ static void print_packet (char *buf) { puts_filtered ("\""); fputstr_filtered (buf, '"', gdb_stdout); puts_filtered ("\""); } int putpkt (char *buf) { return putpkt_binary (buf, strlen (buf)); } /* Send a packet to the remote machine, with error checking. The data of the packet is in BUF. The string in BUF can be at most get_remote_packet_size () - 5 to account for the $, # and checksum, and for a possible /0 if we are debugging (remote_debug) and want to print the sent packet as a string. */ static int putpkt_binary (char *buf, int cnt) { struct remote_state *rs = get_remote_state (); int i; unsigned char csum = 0; char *buf2 = alloca (cnt + 6); int ch; int tcount = 0; char *p; /* Catch cases like trying to read memory or listing threads while we're waiting for a stop reply. The remote server wouldn't be ready to handle this request, so we'd hang and timeout. We don't have to worry about this in synchronous mode, because in that case it's not possible to issue a command while the target is running. This is not a problem in non-stop mode, because in that case, the stub is always ready to process serial input. */ if (!non_stop && target_can_async_p () && rs->waiting_for_stop_reply) error (_("Cannot execute this command while the target is running.")); /* We're sending out a new packet. Make sure we don't look at a stale cached response. */ rs->cached_wait_status = 0; /* Copy the packet into buffer BUF2, encapsulating it and giving it a checksum. */ p = buf2; *p++ = '$'; for (i = 0; i < cnt; i++) { csum += buf[i]; *p++ = buf[i]; } *p++ = '#'; *p++ = tohex ((csum >> 4) & 0xf); *p++ = tohex (csum & 0xf); /* Send it over and over until we get a positive ack. */ while (1) { int started_error_output = 0; if (remote_debug) { struct cleanup *old_chain; char *str; *p = '\0'; str = escape_buffer (buf2, p - buf2); old_chain = make_cleanup (xfree, str); fprintf_unfiltered (gdb_stdlog, "Sending packet: %s...", str); gdb_flush (gdb_stdlog); do_cleanups (old_chain); } if (serial_write (remote_desc, buf2, p - buf2)) perror_with_name (_("putpkt: write failed")); /* If this is a no acks version of the remote protocol, send the packet and move on. */ if (rs->noack_mode) break; /* Read until either a timeout occurs (-2) or '+' is read. Handle any notification that arrives in the mean time. */ while (1) { ch = readchar (remote_timeout); if (remote_debug) { switch (ch) { case '+': case '-': case SERIAL_TIMEOUT: case '$': case '%': if (started_error_output) { putchar_unfiltered ('\n'); started_error_output = 0; } } } switch (ch) { case '+': if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Ack\n"); return 1; case '-': if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Nak\n"); case SERIAL_TIMEOUT: tcount++; if (tcount > 3) return 0; break; /* Retransmit buffer. */ case '$': { if (remote_debug) fprintf_unfiltered (gdb_stdlog, "Packet instead of Ack, ignoring it\n"); /* It's probably an old response sent because an ACK was lost. Gobble up the packet and ack it so it doesn't get retransmitted when we resend this packet. */ skip_frame (); serial_write (remote_desc, "+", 1); continue; /* Now, go look for +. */ } case '%': { int val; /* If we got a notification, handle it, and go back to looking for an ack. */ /* We've found the start of a notification. Now collect the data. */ val = read_frame (&rs->buf, &rs->buf_size); if (val >= 0) { if (remote_debug) { struct cleanup *old_chain; char *str; str = escape_buffer (rs->buf, val); old_chain = make_cleanup (xfree, str); fprintf_unfiltered (gdb_stdlog, " Notification received: %s\n", str); do_cleanups (old_chain); } handle_notification (rs->buf, val); /* We're in sync now, rewait for the ack. */ tcount = 0; } else { if (remote_debug) { if (!started_error_output) { started_error_output = 1; fprintf_unfiltered (gdb_stdlog, "putpkt: Junk: "); } fputc_unfiltered (ch & 0177, gdb_stdlog); fprintf_unfiltered (gdb_stdlog, "%s", rs->buf); } } continue; } /* fall-through */ default: if (remote_debug) { if (!started_error_output) { started_error_output = 1; fprintf_unfiltered (gdb_stdlog, "putpkt: Junk: "); } fputc_unfiltered (ch & 0177, gdb_stdlog); } continue; } break; /* Here to retransmit. */ } #if 0 /* This is wrong. If doing a long backtrace, the user should be able to get out next time we call QUIT, without anything as violent as interrupt_query. If we want to provide a way out of here without getting to the next QUIT, it should be based on hitting ^C twice as in remote_wait. */ if (quit_flag) { quit_flag = 0; interrupt_query (); } #endif } return 0; } /* Come here after finding the start of a frame when we expected an ack. Do our best to discard the rest of this packet. */ static void skip_frame (void) { int c; while (1) { c = readchar (remote_timeout); switch (c) { case SERIAL_TIMEOUT: /* Nothing we can do. */ return; case '#': /* Discard the two bytes of checksum and stop. */ c = readchar (remote_timeout); if (c >= 0) c = readchar (remote_timeout); return; case '*': /* Run length encoding. */ /* Discard the repeat count. */ c = readchar (remote_timeout); if (c < 0) return; break; default: /* A regular character. */ break; } } } /* Come here after finding the start of the frame. Collect the rest into *BUF, verifying the checksum, length, and handling run-length compression. NUL terminate the buffer. If there is not enough room, expand *BUF using xrealloc. Returns -1 on error, number of characters in buffer (ignoring the trailing NULL) on success. (could be extended to return one of the SERIAL status indications). */ static long read_frame (char **buf_p, long *sizeof_buf) { unsigned char csum; long bc; int c; char *buf = *buf_p; struct remote_state *rs = get_remote_state (); csum = 0; bc = 0; while (1) { c = readchar (remote_timeout); switch (c) { case SERIAL_TIMEOUT: if (remote_debug) fputs_filtered ("Timeout in mid-packet, retrying\n", gdb_stdlog); return -1; case '$': if (remote_debug) fputs_filtered ("Saw new packet start in middle of old one\n", gdb_stdlog); return -1; /* Start a new packet, count retries. */ case '#': { unsigned char pktcsum; int check_0 = 0; int check_1 = 0; buf[bc] = '\0'; check_0 = readchar (remote_timeout); if (check_0 >= 0) check_1 = readchar (remote_timeout); if (check_0 == SERIAL_TIMEOUT || check_1 == SERIAL_TIMEOUT) { if (remote_debug) fputs_filtered ("Timeout in checksum, retrying\n", gdb_stdlog); return -1; } else if (check_0 < 0 || check_1 < 0) { if (remote_debug) fputs_filtered ("Communication error in checksum\n", gdb_stdlog); return -1; } /* Don't recompute the checksum; with no ack packets we don't have any way to indicate a packet retransmission is necessary. */ if (rs->noack_mode) return bc; pktcsum = (fromhex (check_0) << 4) | fromhex (check_1); if (csum == pktcsum) return bc; if (remote_debug) { struct cleanup *old_chain; char *str; str = escape_buffer (buf, bc); old_chain = make_cleanup (xfree, str); fprintf_unfiltered (gdb_stdlog, "\ Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", pktcsum, csum, str); do_cleanups (old_chain); } /* Number of characters in buffer ignoring trailing NULL. */ return -1; } case '*': /* Run length encoding. */ { int repeat; csum += c; c = readchar (remote_timeout); csum += c; repeat = c - ' ' + 3; /* Compute repeat count. */ /* The character before ``*'' is repeated. */ if (repeat > 0 && repeat <= 255 && bc > 0) { if (bc + repeat - 1 >= *sizeof_buf - 1) { /* Make some more room in the buffer. */ *sizeof_buf += repeat; *buf_p = xrealloc (*buf_p, *sizeof_buf); buf = *buf_p; } memset (&buf[bc], buf[bc - 1], repeat); bc += repeat; continue; } buf[bc] = '\0'; printf_filtered (_("Invalid run length encoding: %s\n"), buf); return -1; } default: if (bc >= *sizeof_buf - 1) { /* Make some more room in the buffer. */ *sizeof_buf *= 2; *buf_p = xrealloc (*buf_p, *sizeof_buf); buf = *buf_p; } buf[bc++] = c; csum += c; continue; } } } /* Read a packet from the remote machine, with error checking, and store it in *BUF. Resize *BUF using xrealloc if necessary to hold the result, and update *SIZEOF_BUF. If FOREVER, wait forever rather than timing out; this is used (in synchronous mode) to wait for a target that is is executing user code to stop. */ /* FIXME: ezannoni 2000-02-01 this wrapper is necessary so that we don't have to change all the calls to getpkt to deal with the return value, because at the moment I don't know what the right thing to do it for those. */ void getpkt (char **buf, long *sizeof_buf, int forever) { int timed_out; timed_out = getpkt_sane (buf, sizeof_buf, forever); } /* Read a packet from the remote machine, with error checking, and store it in *BUF. Resize *BUF using xrealloc if necessary to hold the result, and update *SIZEOF_BUF. If FOREVER, wait forever rather than timing out; this is used (in synchronous mode) to wait for a target that is is executing user code to stop. If FOREVER == 0, this function is allowed to time out gracefully and return an indication of this to the caller. Otherwise return the number of bytes read. If EXPECTING_NOTIF, consider receiving a notification enough reason to return to the caller. */ static int getpkt_or_notif_sane_1 (char **buf, long *sizeof_buf, int forever, int expecting_notif) { struct remote_state *rs = get_remote_state (); int c; int tries; int timeout; int val = -1; /* We're reading a new response. Make sure we don't look at a previously cached response. */ rs->cached_wait_status = 0; strcpy (*buf, "timeout"); if (forever) timeout = watchdog > 0 ? watchdog : -1; else if (expecting_notif) timeout = 0; /* There should already be a char in the buffer. If not, bail out. */ else timeout = remote_timeout; #define MAX_TRIES 3 /* Process any number of notifications, and then return when we get a packet. */ for (;;) { /* If we get a timeout or bad checksm, retry up to MAX_TRIES times. */ for (tries = 1; tries <= MAX_TRIES; tries++) { /* This can loop forever if the remote side sends us characters continuously, but if it pauses, we'll get SERIAL_TIMEOUT from readchar because of timeout. Then we'll count that as a retry. Note that even when forever is set, we will only wait forever prior to the start of a packet. After that, we expect characters to arrive at a brisk pace. They should show up within remote_timeout intervals. */ do c = readchar (timeout); while (c != SERIAL_TIMEOUT && c != '$' && c != '%'); if (c == SERIAL_TIMEOUT) { if (expecting_notif) return -1; /* Don't complain, it's normal to not get anything in this case. */ if (forever) /* Watchdog went off? Kill the target. */ { QUIT; pop_target (); error (_("Watchdog timeout has expired. Target detached.")); } if (remote_debug) fputs_filtered ("Timed out.\n", gdb_stdlog); } else { /* We've found the start of a packet or notification. Now collect the data. */ val = read_frame (buf, sizeof_buf); if (val >= 0) break; } serial_write (remote_desc, "-", 1); } if (tries > MAX_TRIES) { /* We have tried hard enough, and just can't receive the packet/notification. Give up. */ printf_unfiltered (_("Ignoring packet error, continuing...\n")); /* Skip the ack char if we're in no-ack mode. */ if (!rs->noack_mode) serial_write (remote_desc, "+", 1); return -1; } /* If we got an ordinary packet, return that to our caller. */ if (c == '$') { if (remote_debug) { struct cleanup *old_chain; char *str; str = escape_buffer (*buf, val); old_chain = make_cleanup (xfree, str); fprintf_unfiltered (gdb_stdlog, "Packet received: %s\n", str); do_cleanups (old_chain); } /* Skip the ack char if we're in no-ack mode. */ if (!rs->noack_mode) serial_write (remote_desc, "+", 1); return val; } /* If we got a notification, handle it, and go back to looking for a packet. */ else { gdb_assert (c == '%'); if (remote_debug) { struct cleanup *old_chain; char *str; str = escape_buffer (*buf, val); old_chain = make_cleanup (xfree, str); fprintf_unfiltered (gdb_stdlog, " Notification received: %s\n", str); do_cleanups (old_chain); } handle_notification (*buf, val); /* Notifications require no acknowledgement. */ if (expecting_notif) return -1; } } } static int getpkt_sane (char **buf, long *sizeof_buf, int forever) { return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 0); } static int getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever) { return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 1); } static void remote_kill (struct target_ops *ops) { /* Use catch_errors so the user can quit from gdb even when we aren't on speaking terms with the remote system. */ catch_errors ((catch_errors_ftype *) putpkt, "k", "", RETURN_MASK_ERROR); /* Don't wait for it to die. I'm not really sure it matters whether we do or not. For the existing stubs, kill is a noop. */ target_mourn_inferior (); } static int remote_vkill (int pid, struct remote_state *rs) { if (remote_protocol_packets[PACKET_vKill].support == PACKET_DISABLE) return -1; /* Tell the remote target to detach. */ sprintf (rs->buf, "vKill;%x", pid); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_vKill]) == PACKET_OK) return 0; else if (remote_protocol_packets[PACKET_vKill].support == PACKET_DISABLE) return -1; else return 1; } static void extended_remote_kill (struct target_ops *ops) { int res; int pid = ptid_get_pid (inferior_ptid); struct remote_state *rs = get_remote_state (); res = remote_vkill (pid, rs); if (res == -1 && !remote_multi_process_p (rs)) { /* Don't try 'k' on a multi-process aware stub -- it has no way to specify the pid. */ putpkt ("k"); #if 0 getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] != 'O' || rs->buf[0] != 'K') res = 1; #else /* Don't wait for it to die. I'm not really sure it matters whether we do or not. For the existing stubs, kill is a noop. */ res = 0; #endif } if (res != 0) error (_("Can't kill process")); target_mourn_inferior (); } static void remote_mourn (struct target_ops *ops) { remote_mourn_1 (ops); } /* Worker function for remote_mourn. */ static void remote_mourn_1 (struct target_ops *target) { unpush_target (target); /* remote_close takes care of doing most of the clean up. */ generic_mourn_inferior (); } static void extended_remote_mourn_1 (struct target_ops *target) { struct remote_state *rs = get_remote_state (); /* In case we got here due to an error, but we're going to stay connected. */ rs->waiting_for_stop_reply = 0; /* We're no longer interested in these events. */ discard_pending_stop_replies (ptid_get_pid (inferior_ptid)); /* If the current general thread belonged to the process we just detached from or has exited, the remote side current general thread becomes undefined. Considering a case like this: - We just got here due to a detach. - The process that we're detaching from happens to immediately report a global breakpoint being hit in non-stop mode, in the same thread we had selected before. - GDB attaches to this process again. - This event happens to be the next event we handle. GDB would consider that the current general thread didn't need to be set on the stub side (with Hg), since for all it knew, GENERAL_THREAD hadn't changed. Notice that although in all-stop mode, the remote server always sets the current thread to the thread reporting the stop event, that doesn't happen in non-stop mode; in non-stop, the stub *must not* change the current thread when reporting a breakpoint hit, due to the decoupling of event reporting and event handling. To keep things simple, we always invalidate our notion of the current thread. */ record_currthread (minus_one_ptid); /* Unlike "target remote", we do not want to unpush the target; then the next time the user says "run", we won't be connected. */ /* Call common code to mark the inferior as not running. */ generic_mourn_inferior (); if (!have_inferiors ()) { if (!remote_multi_process_p (rs)) { /* Check whether the target is running now - some remote stubs automatically restart after kill. */ putpkt ("?"); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'S' || rs->buf[0] == 'T') { /* Assume that the target has been restarted. Set inferior_ptid so that bits of core GDB realizes there's something here, e.g., so that the user can say "kill" again. */ inferior_ptid = magic_null_ptid; } } } } static void extended_remote_mourn (struct target_ops *ops) { extended_remote_mourn_1 (ops); } static int extended_remote_run (char *args) { struct remote_state *rs = get_remote_state (); int len; /* If the user has disabled vRun support, or we have detected that support is not available, do not try it. */ if (remote_protocol_packets[PACKET_vRun].support == PACKET_DISABLE) return -1; strcpy (rs->buf, "vRun;"); len = strlen (rs->buf); if (strlen (remote_exec_file) * 2 + len >= get_remote_packet_size ()) error (_("Remote file name too long for run packet")); len += 2 * bin2hex ((gdb_byte *) remote_exec_file, rs->buf + len, 0); gdb_assert (args != NULL); if (*args) { struct cleanup *back_to; int i; char **argv; argv = gdb_buildargv (args); back_to = make_cleanup ((void (*) (void *)) freeargv, argv); for (i = 0; argv[i] != NULL; i++) { if (strlen (argv[i]) * 2 + 1 + len >= get_remote_packet_size ()) error (_("Argument list too long for run packet")); rs->buf[len++] = ';'; len += 2 * bin2hex ((gdb_byte *) argv[i], rs->buf + len, 0); } do_cleanups (back_to); } rs->buf[len++] = '\0'; putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_vRun]) == PACKET_OK) { /* We have a wait response; we don't need it, though. All is well. */ return 0; } else if (remote_protocol_packets[PACKET_vRun].support == PACKET_DISABLE) /* It wasn't disabled before, but it is now. */ return -1; else { if (remote_exec_file[0] == '\0') error (_("Running the default executable on the remote target failed; " "try \"set remote exec-file\"?")); else error (_("Running \"%s\" on the remote target failed"), remote_exec_file); } } /* In the extended protocol we want to be able to do things like "run" and have them basically work as expected. So we need a special create_inferior function. We support changing the executable file and the command line arguments, but not the environment. */ static void extended_remote_create_inferior_1 (char *exec_file, char *args, char **env, int from_tty) { /* If running asynchronously, register the target file descriptor with the event loop. */ if (target_can_async_p ()) target_async (inferior_event_handler, 0); /* Now restart the remote server. */ if (extended_remote_run (args) == -1) { /* vRun was not supported. Fail if we need it to do what the user requested. */ if (remote_exec_file[0]) error (_("Remote target does not support \"set remote exec-file\"")); if (args[0]) error (_("Remote target does not support \"set args\" or run <ARGS>")); /* Fall back to "R". */ extended_remote_restart (); } if (!have_inferiors ()) { /* Clean up from the last time we ran, before we mark the target running again. This will mark breakpoints uninserted, and get_offsets may insert breakpoints. */ init_thread_list (); init_wait_for_inferior (); } /* Now mark the inferior as running before we do anything else. */ inferior_ptid = magic_null_ptid; /* Now, if we have thread information, update inferior_ptid. */ inferior_ptid = remote_current_thread (inferior_ptid); remote_add_inferior (ptid_get_pid (inferior_ptid), 0); add_thread_silent (inferior_ptid); /* Get updated offsets, if the stub uses qOffsets. */ get_offsets (); } static void extended_remote_create_inferior (struct target_ops *ops, char *exec_file, char *args, char **env, int from_tty) { extended_remote_create_inferior_1 (exec_file, args, env, from_tty); } /* Insert a breakpoint. On targets that have software breakpoint support, we ask the remote target to do the work; on targets which don't, we insert a traditional memory breakpoint. */ static int remote_insert_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { /* Try the "Z" s/w breakpoint packet if it is not already disabled. If it succeeds, then set the support to PACKET_ENABLE. If it fails, and the user has explicitly requested the Z support then report an error, otherwise, mark it disabled and go on. */ if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE) { CORE_ADDR addr = bp_tgt->placed_address; struct remote_state *rs; char *p; int bpsize; gdbarch_remote_breakpoint_from_pc (gdbarch, &addr, &bpsize); rs = get_remote_state (); p = rs->buf; *(p++) = 'Z'; *(p++) = '0'; *(p++) = ','; addr = (ULONGEST) remote_address_masked (addr); p += hexnumstr (p, addr); sprintf (p, ",%d", bpsize); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0])) { case PACKET_ERROR: return -1; case PACKET_OK: bp_tgt->placed_address = addr; bp_tgt->placed_size = bpsize; return 0; case PACKET_UNKNOWN: break; } } return memory_insert_breakpoint (gdbarch, bp_tgt); } static int remote_remove_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { CORE_ADDR addr = bp_tgt->placed_address; struct remote_state *rs = get_remote_state (); if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE) { char *p = rs->buf; *(p++) = 'z'; *(p++) = '0'; *(p++) = ','; addr = (ULONGEST) remote_address_masked (bp_tgt->placed_address); p += hexnumstr (p, addr); sprintf (p, ",%d", bp_tgt->placed_size); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); return (rs->buf[0] == 'E'); } return memory_remove_breakpoint (gdbarch, bp_tgt); } static int watchpoint_to_Z_packet (int type) { switch (type) { case hw_write: return Z_PACKET_WRITE_WP; break; case hw_read: return Z_PACKET_READ_WP; break; case hw_access: return Z_PACKET_ACCESS_WP; break; default: internal_error (__FILE__, __LINE__, _("hw_bp_to_z: bad watchpoint type %d"), type); } } static int remote_insert_watchpoint (CORE_ADDR addr, int len, int type) { struct remote_state *rs = get_remote_state (); char *p; enum Z_packet_type packet = watchpoint_to_Z_packet (type); if (remote_protocol_packets[PACKET_Z0 + packet].support == PACKET_DISABLE) return -1; sprintf (rs->buf, "Z%x,", packet); p = strchr (rs->buf, '\0'); addr = remote_address_masked (addr); p += hexnumstr (p, (ULONGEST) addr); sprintf (p, ",%x", len); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0 + packet])) { case PACKET_ERROR: case PACKET_UNKNOWN: return -1; case PACKET_OK: return 0; } internal_error (__FILE__, __LINE__, _("remote_insert_watchpoint: reached end of function")); } static int remote_remove_watchpoint (CORE_ADDR addr, int len, int type) { struct remote_state *rs = get_remote_state (); char *p; enum Z_packet_type packet = watchpoint_to_Z_packet (type); if (remote_protocol_packets[PACKET_Z0 + packet].support == PACKET_DISABLE) return -1; sprintf (rs->buf, "z%x,", packet); p = strchr (rs->buf, '\0'); addr = remote_address_masked (addr); p += hexnumstr (p, (ULONGEST) addr); sprintf (p, ",%x", len); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0 + packet])) { case PACKET_ERROR: case PACKET_UNKNOWN: return -1; case PACKET_OK: return 0; } internal_error (__FILE__, __LINE__, _("remote_remove_watchpoint: reached end of function")); } int remote_hw_watchpoint_limit = -1; int remote_hw_breakpoint_limit = -1; static int remote_check_watch_resources (int type, int cnt, int ot) { if (type == bp_hardware_breakpoint) { if (remote_hw_breakpoint_limit == 0) return 0; else if (remote_hw_breakpoint_limit < 0) return 1; else if (cnt <= remote_hw_breakpoint_limit) return 1; } else { if (remote_hw_watchpoint_limit == 0) return 0; else if (remote_hw_watchpoint_limit < 0) return 1; else if (ot) return -1; else if (cnt <= remote_hw_watchpoint_limit) return 1; } return -1; } static int remote_stopped_by_watchpoint (void) { return remote_stopped_by_watchpoint_p; } static int remote_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p) { int rc = 0; if (remote_stopped_by_watchpoint ()) { *addr_p = remote_watch_data_address; rc = 1; } return rc; } static int remote_insert_hw_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { CORE_ADDR addr; struct remote_state *rs; char *p; /* The length field should be set to the size of a breakpoint instruction, even though we aren't inserting one ourselves. */ gdbarch_remote_breakpoint_from_pc (gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size); if (remote_protocol_packets[PACKET_Z1].support == PACKET_DISABLE) return -1; rs = get_remote_state (); p = rs->buf; *(p++) = 'Z'; *(p++) = '1'; *(p++) = ','; addr = remote_address_masked (bp_tgt->placed_address); p += hexnumstr (p, (ULONGEST) addr); sprintf (p, ",%x", bp_tgt->placed_size); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z1])) { case PACKET_ERROR: case PACKET_UNKNOWN: return -1; case PACKET_OK: return 0; } internal_error (__FILE__, __LINE__, _("remote_insert_hw_breakpoint: reached end of function")); } static int remote_remove_hw_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { CORE_ADDR addr; struct remote_state *rs = get_remote_state (); char *p = rs->buf; if (remote_protocol_packets[PACKET_Z1].support == PACKET_DISABLE) return -1; *(p++) = 'z'; *(p++) = '1'; *(p++) = ','; addr = remote_address_masked (bp_tgt->placed_address); p += hexnumstr (p, (ULONGEST) addr); sprintf (p, ",%x", bp_tgt->placed_size); putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z1])) { case PACKET_ERROR: case PACKET_UNKNOWN: return -1; case PACKET_OK: return 0; } internal_error (__FILE__, __LINE__, _("remote_remove_hw_breakpoint: reached end of function")); } /* Table used by the crc32 function to calcuate the checksum. */ static unsigned long crc32_table[256] = {0, 0}; static unsigned long crc32 (unsigned char *buf, int len, unsigned int crc) { if (!crc32_table[1]) { /* Initialize the CRC table and the decoding table. */ int i, j; unsigned int c; for (i = 0; i < 256; i++) { for (c = i << 24, j = 8; j > 0; --j) c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1); crc32_table[i] = c; } } while (len--) { crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255]; buf++; } return crc; } /* compare-sections command With no arguments, compares each loadable section in the exec bfd with the same memory range on the target, and reports mismatches. Useful for verifying the image on the target against the exec file. Depends on the target understanding the new "qCRC:" request. */ /* FIXME: cagney/1999-10-26: This command should be broken down into a target method (target verify memory) and generic version of the actual command. This will allow other high-level code (especially generic_load()) to make use of this target functionality. */ static void compare_sections_command (char *args, int from_tty) { struct remote_state *rs = get_remote_state (); asection *s; unsigned long host_crc, target_crc; struct cleanup *old_chain; char *tmp; char *sectdata; const char *sectname; bfd_size_type size; bfd_vma lma; int matched = 0; int mismatched = 0; if (!exec_bfd) error (_("command cannot be used without an exec file")); if (!current_target.to_shortname || strcmp (current_target.to_shortname, "remote") != 0) error (_("command can only be used with remote target")); for (s = exec_bfd->sections; s; s = s->next) { if (!(s->flags & SEC_LOAD)) continue; /* skip non-loadable section */ size = bfd_get_section_size (s); if (size == 0) continue; /* skip zero-length section */ sectname = bfd_get_section_name (exec_bfd, s); if (args && strcmp (args, sectname) != 0) continue; /* not the section selected by user */ matched = 1; /* do this section */ lma = s->lma; /* FIXME: assumes lma can fit into long. */ xsnprintf (rs->buf, get_remote_packet_size (), "qCRC:%lx,%lx", (long) lma, (long) size); putpkt (rs->buf); /* Be clever; compute the host_crc before waiting for target reply. */ sectdata = xmalloc (size); old_chain = make_cleanup (xfree, sectdata); bfd_get_section_contents (exec_bfd, s, sectdata, 0, size); host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff); getpkt (&rs->buf, &rs->buf_size, 0); if (rs->buf[0] == 'E') error (_("target memory fault, section %s, range %s -- %s"), sectname, paddress (target_gdbarch, lma), paddress (target_gdbarch, lma + size)); if (rs->buf[0] != 'C') error (_("remote target does not support this operation")); for (target_crc = 0, tmp = &rs->buf[1]; *tmp; tmp++) target_crc = target_crc * 16 + fromhex (*tmp); printf_filtered ("Section %s, range %s -- %s: ", sectname, paddress (target_gdbarch, lma), paddress (target_gdbarch, lma + size)); if (host_crc == target_crc) printf_filtered ("matched.\n"); else { printf_filtered ("MIS-MATCHED!\n"); mismatched++; } do_cleanups (old_chain); } if (mismatched > 0) warning (_("One or more sections of the remote executable does not match\n\ the loaded file\n")); if (args && !matched) printf_filtered (_("No loaded section named '%s'.\n"), args); } /* Write LEN bytes from WRITEBUF into OBJECT_NAME/ANNEX at OFFSET into remote target. The number of bytes written to the remote target is returned, or -1 for error. */ static LONGEST remote_write_qxfer (struct target_ops *ops, const char *object_name, const char *annex, const gdb_byte *writebuf, ULONGEST offset, LONGEST len, struct packet_config *packet) { int i, buf_len; ULONGEST n; struct remote_state *rs = get_remote_state (); int max_size = get_memory_write_packet_size (); if (packet->support == PACKET_DISABLE) return -1; /* Insert header. */ i = snprintf (rs->buf, max_size, "qXfer:%s:write:%s:%s:", object_name, annex ? annex : "", phex_nz (offset, sizeof offset)); max_size -= (i + 1); /* Escape as much data as fits into rs->buf. */ buf_len = remote_escape_output (writebuf, len, (rs->buf + i), &max_size, max_size); if (putpkt_binary (rs->buf, i + buf_len) < 0 || getpkt_sane (&rs->buf, &rs->buf_size, 0) < 0 || packet_ok (rs->buf, packet) != PACKET_OK) return -1; unpack_varlen_hex (rs->buf, &n); return n; } /* Read OBJECT_NAME/ANNEX from the remote target using a qXfer packet. Data at OFFSET, of up to LEN bytes, is read into READBUF; the number of bytes read is returned, or 0 for EOF, or -1 for error. The number of bytes read may be less than LEN without indicating an EOF. PACKET is checked and updated to indicate whether the remote target supports this object. */ static LONGEST remote_read_qxfer (struct target_ops *ops, const char *object_name, const char *annex, gdb_byte *readbuf, ULONGEST offset, LONGEST len, struct packet_config *packet) { static char *finished_object; static char *finished_annex; static ULONGEST finished_offset; struct remote_state *rs = get_remote_state (); LONGEST i, n, packet_len; if (packet->support == PACKET_DISABLE) return -1; /* Check whether we've cached an end-of-object packet that matches this request. */ if (finished_object) { if (strcmp (object_name, finished_object) == 0 && strcmp (annex ? annex : "", finished_annex) == 0 && offset == finished_offset) return 0; /* Otherwise, we're now reading something different. Discard the cache. */ xfree (finished_object); xfree (finished_annex); finished_object = NULL; finished_annex = NULL; } /* Request only enough to fit in a single packet. The actual data may not, since we don't know how much of it will need to be escaped; the target is free to respond with slightly less data. We subtract five to account for the response type and the protocol frame. */ n = min (get_remote_packet_size () - 5, len); snprintf (rs->buf, get_remote_packet_size () - 4, "qXfer:%s:read:%s:%s,%s", object_name, annex ? annex : "", phex_nz (offset, sizeof offset), phex_nz (n, sizeof n)); i = putpkt (rs->buf); if (i < 0) return -1; rs->buf[0] = '\0'; packet_len = getpkt_sane (&rs->buf, &rs->buf_size, 0); if (packet_len < 0 || packet_ok (rs->buf, packet) != PACKET_OK) return -1; if (rs->buf[0] != 'l' && rs->buf[0] != 'm') error (_("Unknown remote qXfer reply: %s"), rs->buf); /* 'm' means there is (or at least might be) more data after this batch. That does not make sense unless there's at least one byte of data in this reply. */ if (rs->buf[0] == 'm' && packet_len == 1) error (_("Remote qXfer reply contained no data.")); /* Got some data. */ i = remote_unescape_input (rs->buf + 1, packet_len - 1, readbuf, n); /* 'l' is an EOF marker, possibly including a final block of data, or possibly empty. If we have the final block of a non-empty object, record this fact to bypass a subsequent partial read. */ if (rs->buf[0] == 'l' && offset + i > 0) { finished_object = xstrdup (object_name); finished_annex = xstrdup (annex ? annex : ""); finished_offset = offset + i; } return i; } static LONGEST remote_xfer_partial (struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, LONGEST len) { struct remote_state *rs; int i; char *p2; char query_type; set_general_thread (inferior_ptid); rs = get_remote_state (); /* Handle memory using the standard memory routines. */ if (object == TARGET_OBJECT_MEMORY) { int xfered; errno = 0; /* If the remote target is connected but not running, we should pass this request down to a lower stratum (e.g. the executable file). */ if (!target_has_execution) return 0; if (writebuf != NULL) xfered = remote_write_bytes (offset, writebuf, len); else xfered = remote_read_bytes (offset, readbuf, len); if (xfered > 0) return xfered; else if (xfered == 0 && errno == 0) return 0; else return -1; } /* Handle SPU memory using qxfer packets. */ if (object == TARGET_OBJECT_SPU) { if (readbuf) return remote_read_qxfer (ops, "spu", annex, readbuf, offset, len, &remote_protocol_packets [PACKET_qXfer_spu_read]); else return remote_write_qxfer (ops, "spu", annex, writebuf, offset, len, &remote_protocol_packets [PACKET_qXfer_spu_write]); } /* Handle extra signal info using qxfer packets. */ if (object == TARGET_OBJECT_SIGNAL_INFO) { if (readbuf) return remote_read_qxfer (ops, "siginfo", annex, readbuf, offset, len, &remote_protocol_packets [PACKET_qXfer_siginfo_read]); else return remote_write_qxfer (ops, "siginfo", annex, writebuf, offset, len, &remote_protocol_packets [PACKET_qXfer_siginfo_write]); } /* Only handle flash writes. */ if (writebuf != NULL) { LONGEST xfered; switch (object) { case TARGET_OBJECT_FLASH: xfered = remote_flash_write (ops, offset, len, writebuf); if (xfered > 0) return xfered; else if (xfered == 0 && errno == 0) return 0; else return -1; default: return -1; } } /* Map pre-existing objects onto letters. DO NOT do this for new objects!!! Instead specify new query packets. */ switch (object) { case TARGET_OBJECT_AVR: query_type = 'R'; break; case TARGET_OBJECT_AUXV: gdb_assert (annex == NULL); return remote_read_qxfer (ops, "auxv", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_auxv]); case TARGET_OBJECT_AVAILABLE_FEATURES: return remote_read_qxfer (ops, "features", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_features]); case TARGET_OBJECT_LIBRARIES: return remote_read_qxfer (ops, "libraries", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_libraries]); case TARGET_OBJECT_MEMORY_MAP: gdb_assert (annex == NULL); return remote_read_qxfer (ops, "memory-map", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_memory_map]); case TARGET_OBJECT_OSDATA: /* Should only get here if we're connected. */ gdb_assert (remote_desc); return remote_read_qxfer (ops, "osdata", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_osdata]); case TARGET_OBJECT_THREADS: gdb_assert (annex == NULL); return remote_read_qxfer (ops, "threads", annex, readbuf, offset, len, &remote_protocol_packets[PACKET_qXfer_threads]); default: return -1; } /* Note: a zero OFFSET and LEN can be used to query the minimum buffer size. */ if (offset == 0 && len == 0) return (get_remote_packet_size ()); /* Minimum outbuf size is get_remote_packet_size (). If LEN is not large enough let the caller deal with it. */ if (len < get_remote_packet_size ()) return -1; len = get_remote_packet_size (); /* Except for querying the minimum buffer size, target must be open. */ if (!remote_desc) error (_("remote query is only available after target open")); gdb_assert (annex != NULL); gdb_assert (readbuf != NULL); p2 = rs->buf; *p2++ = 'q'; *p2++ = query_type; /* We used one buffer char for the remote protocol q command and another for the query type. As the remote protocol encapsulation uses 4 chars plus one extra in case we are debugging (remote_debug), we have PBUFZIZ - 7 left to pack the query string. */ i = 0; while (annex[i] && (i < (get_remote_packet_size () - 8))) { /* Bad caller may have sent forbidden characters. */ gdb_assert (isprint (annex[i]) && annex[i] != '$' && annex[i] != '#'); *p2++ = annex[i]; i++; } *p2 = '\0'; gdb_assert (annex[i] == '\0'); i = putpkt (rs->buf); if (i < 0) return i; getpkt (&rs->buf, &rs->buf_size, 0); strcpy ((char *) readbuf, rs->buf); return strlen ((char *) readbuf); } static int remote_search_memory (struct target_ops* ops, CORE_ADDR start_addr, ULONGEST search_space_len, const gdb_byte *pattern, ULONGEST pattern_len, CORE_ADDR *found_addrp) { int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; struct remote_state *rs = get_remote_state (); int max_size = get_memory_write_packet_size (); struct packet_config *packet = &remote_protocol_packets[PACKET_qSearch_memory]; /* number of packet bytes used to encode the pattern, this could be more than PATTERN_LEN due to escape characters */ int escaped_pattern_len; /* amount of pattern that was encodable in the packet */ int used_pattern_len; int i; int found; ULONGEST found_addr; /* Don't go to the target if we don't have to. This is done before checking packet->support to avoid the possibility that a success for this edge case means the facility works in general. */ if (pattern_len > search_space_len) return 0; if (pattern_len == 0) { *found_addrp = start_addr; return 1; } /* If we already know the packet isn't supported, fall back to the simple way of searching memory. */ if (packet->support == PACKET_DISABLE) { /* Target doesn't provided special support, fall back and use the standard support (copy memory and do the search here). */ return simple_search_memory (ops, start_addr, search_space_len, pattern, pattern_len, found_addrp); } /* Insert header. */ i = snprintf (rs->buf, max_size, "qSearch:memory:%s;%s;", phex_nz (start_addr, addr_size), phex_nz (search_space_len, sizeof (search_space_len))); max_size -= (i + 1); /* Escape as much data as fits into rs->buf. */ escaped_pattern_len = remote_escape_output (pattern, pattern_len, (rs->buf + i), &used_pattern_len, max_size); /* Bail if the pattern is too large. */ if (used_pattern_len != pattern_len) error ("Pattern is too large to transmit to remote target."); if (putpkt_binary (rs->buf, i + escaped_pattern_len) < 0 || getpkt_sane (&rs->buf, &rs->buf_size, 0) < 0 || packet_ok (rs->buf, packet) != PACKET_OK) { /* The request may not have worked because the command is not supported. If so, fall back to the simple way. */ if (packet->support == PACKET_DISABLE) { return simple_search_memory (ops, start_addr, search_space_len, pattern, pattern_len, found_addrp); } return -1; } if (rs->buf[0] == '0') found = 0; else if (rs->buf[0] == '1') { found = 1; if (rs->buf[1] != ',') error (_("Unknown qSearch:memory reply: %s"), rs->buf); unpack_varlen_hex (rs->buf + 2, &found_addr); *found_addrp = found_addr; } else error (_("Unknown qSearch:memory reply: %s"), rs->buf); return found; } static void remote_rcmd (char *command, struct ui_file *outbuf) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; if (!remote_desc) error (_("remote rcmd is only available after target open")); /* Send a NULL command across as an empty command. */ if (command == NULL) command = ""; /* The query prefix. */ strcpy (rs->buf, "qRcmd,"); p = strchr (rs->buf, '\0'); if ((strlen (rs->buf) + strlen (command) * 2 + 8/*misc*/) > get_remote_packet_size ()) error (_("\"monitor\" command ``%s'' is too long."), command); /* Encode the actual command. */ bin2hex ((gdb_byte *) command, p, 0); if (putpkt (rs->buf) < 0) error (_("Communication problem with target.")); /* get/display the response */ while (1) { char *buf; /* XXX - see also remote_get_noisy_reply(). */ rs->buf[0] = '\0'; getpkt (&rs->buf, &rs->buf_size, 0); buf = rs->buf; if (buf[0] == '\0') error (_("Target does not support this command.")); if (buf[0] == 'O' && buf[1] != 'K') { remote_console_output (buf + 1); /* 'O' message from stub. */ continue; } if (strcmp (buf, "OK") == 0) break; if (strlen (buf) == 3 && buf[0] == 'E' && isdigit (buf[1]) && isdigit (buf[2])) { error (_("Protocol error with Rcmd")); } for (p = buf; p[0] != '\0' && p[1] != '\0'; p += 2) { char c = (fromhex (p[0]) << 4) + fromhex (p[1]); fputc_unfiltered (c, outbuf); } break; } } static VEC(mem_region_s) * remote_memory_map (struct target_ops *ops) { VEC(mem_region_s) *result = NULL; char *text = target_read_stralloc (¤t_target, TARGET_OBJECT_MEMORY_MAP, NULL); if (text) { struct cleanup *back_to = make_cleanup (xfree, text); result = parse_memory_map (text); do_cleanups (back_to); } return result; } static void packet_command (char *args, int from_tty) { struct remote_state *rs = get_remote_state (); if (!remote_desc) error (_("command can only be used with remote target")); if (!args) error (_("remote-packet command requires packet text as argument")); puts_filtered ("sending: "); print_packet (args); puts_filtered ("\n"); putpkt (args); getpkt (&rs->buf, &rs->buf_size, 0); puts_filtered ("received: "); print_packet (rs->buf); puts_filtered ("\n"); } #if 0 /* --------- UNIT_TEST for THREAD oriented PACKETS ------------------- */ static void display_thread_info (struct gdb_ext_thread_info *info); static void threadset_test_cmd (char *cmd, int tty); static void threadalive_test (char *cmd, int tty); static void threadlist_test_cmd (char *cmd, int tty); int get_and_display_threadinfo (threadref *ref); static void threadinfo_test_cmd (char *cmd, int tty); static int thread_display_step (threadref *ref, void *context); static void threadlist_update_test_cmd (char *cmd, int tty); static void init_remote_threadtests (void); #define SAMPLE_THREAD 0x05060708 /* Truncated 64 bit threadid. */ static void threadset_test_cmd (char *cmd, int tty) { int sample_thread = SAMPLE_THREAD; printf_filtered (_("Remote threadset test\n")); set_general_thread (sample_thread); } static void threadalive_test (char *cmd, int tty) { int sample_thread = SAMPLE_THREAD; int pid = ptid_get_pid (inferior_ptid); ptid_t ptid = ptid_build (pid, 0, sample_thread); if (remote_thread_alive (ptid)) printf_filtered ("PASS: Thread alive test\n"); else printf_filtered ("FAIL: Thread alive test\n"); } void output_threadid (char *title, threadref *ref); void output_threadid (char *title, threadref *ref) { char hexid[20]; pack_threadid (&hexid[0], ref); /* Convert threead id into hex. */ hexid[16] = 0; printf_filtered ("%s %s\n", title, (&hexid[0])); } static void threadlist_test_cmd (char *cmd, int tty) { int startflag = 1; threadref nextthread; int done, result_count; threadref threadlist[3]; printf_filtered ("Remote Threadlist test\n"); if (!remote_get_threadlist (startflag, &nextthread, 3, &done, &result_count, &threadlist[0])) printf_filtered ("FAIL: threadlist test\n"); else { threadref *scan = threadlist; threadref *limit = scan + result_count; while (scan < limit) output_threadid (" thread ", scan++); } } void display_thread_info (struct gdb_ext_thread_info *info) { output_threadid ("Threadid: ", &info->threadid); printf_filtered ("Name: %s\n ", info->shortname); printf_filtered ("State: %s\n", info->display); printf_filtered ("other: %s\n\n", info->more_display); } int get_and_display_threadinfo (threadref *ref) { int result; int set; struct gdb_ext_thread_info threadinfo; set = TAG_THREADID | TAG_EXISTS | TAG_THREADNAME | TAG_MOREDISPLAY | TAG_DISPLAY; if (0 != (result = remote_get_threadinfo (ref, set, &threadinfo))) display_thread_info (&threadinfo); return result; } static void threadinfo_test_cmd (char *cmd, int tty) { int athread = SAMPLE_THREAD; threadref thread; int set; int_to_threadref (&thread, athread); printf_filtered ("Remote Threadinfo test\n"); if (!get_and_display_threadinfo (&thread)) printf_filtered ("FAIL cannot get thread info\n"); } static int thread_display_step (threadref *ref, void *context) { /* output_threadid(" threadstep ",ref); *//* simple test */ return get_and_display_threadinfo (ref); } static void threadlist_update_test_cmd (char *cmd, int tty) { printf_filtered ("Remote Threadlist update test\n"); remote_threadlist_iterator (thread_display_step, 0, CRAZY_MAX_THREADS); } static void init_remote_threadtests (void) { add_com ("tlist", class_obscure, threadlist_test_cmd, _("\ Fetch and print the remote list of thread identifiers, one pkt only")); add_com ("tinfo", class_obscure, threadinfo_test_cmd, _("Fetch and display info about one thread")); add_com ("tset", class_obscure, threadset_test_cmd, _("Test setting to a different thread")); add_com ("tupd", class_obscure, threadlist_update_test_cmd, _("Iterate through updating all remote thread info")); add_com ("talive", class_obscure, threadalive_test, _(" Remote thread alive test ")); } #endif /* 0 */ /* Convert a thread ID to a string. Returns the string in a static buffer. */ static char * remote_pid_to_str (struct target_ops *ops, ptid_t ptid) { static char buf[64]; struct remote_state *rs = get_remote_state (); if (ptid_is_pid (ptid)) { /* Printing an inferior target id. */ /* When multi-process extensions are off, there's no way in the remote protocol to know the remote process id, if there's any at all. There's one exception --- when we're connected with target extended-remote, and we manually attached to a process with "attach PID". We don't record anywhere a flag that allows us to distinguish that case from the case of connecting with extended-remote and the stub already being attached to a process, and reporting yes to qAttached, hence no smart special casing here. */ if (!remote_multi_process_p (rs)) { xsnprintf (buf, sizeof buf, "Remote target"); return buf; } return normal_pid_to_str (ptid); } else { if (ptid_equal (magic_null_ptid, ptid)) xsnprintf (buf, sizeof buf, "Thread <main>"); else if (remote_multi_process_p (rs)) xsnprintf (buf, sizeof buf, "Thread %d.%ld", ptid_get_pid (ptid), ptid_get_tid (ptid)); else xsnprintf (buf, sizeof buf, "Thread %ld", ptid_get_tid (ptid)); return buf; } } /* Get the address of the thread local variable in OBJFILE which is stored at OFFSET within the thread local storage for thread PTID. */ static CORE_ADDR remote_get_thread_local_address (struct target_ops *ops, ptid_t ptid, CORE_ADDR lm, CORE_ADDR offset) { if (remote_protocol_packets[PACKET_qGetTLSAddr].support != PACKET_DISABLE) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; char *endp = rs->buf + get_remote_packet_size (); enum packet_result result; strcpy (p, "qGetTLSAddr:"); p += strlen (p); p = write_ptid (p, endp, ptid); *p++ = ','; p += hexnumstr (p, offset); *p++ = ','; p += hexnumstr (p, lm); *p++ = '\0'; putpkt (rs->buf); getpkt (&rs->buf, &rs->buf_size, 0); result = packet_ok (rs->buf, &remote_protocol_packets[PACKET_qGetTLSAddr]); if (result == PACKET_OK) { ULONGEST result; unpack_varlen_hex (rs->buf, &result); return result; } else if (result == PACKET_UNKNOWN) throw_error (TLS_GENERIC_ERROR, _("Remote target doesn't support qGetTLSAddr packet")); else throw_error (TLS_GENERIC_ERROR, _("Remote target failed to process qGetTLSAddr request")); } else throw_error (TLS_GENERIC_ERROR, _("TLS not supported or disabled on this target")); /* Not reached. */ return 0; } /* Support for inferring a target description based on the current architecture and the size of a 'g' packet. While the 'g' packet can have any size (since optional registers can be left off the end), some sizes are easily recognizable given knowledge of the approximate architecture. */ struct remote_g_packet_guess { int bytes; const struct target_desc *tdesc; }; typedef struct remote_g_packet_guess remote_g_packet_guess_s; DEF_VEC_O(remote_g_packet_guess_s); struct remote_g_packet_data { VEC(remote_g_packet_guess_s) *guesses; }; static struct gdbarch_data *remote_g_packet_data_handle; static void * remote_g_packet_data_init (struct obstack *obstack) { return OBSTACK_ZALLOC (obstack, struct remote_g_packet_data); } void register_remote_g_packet_guess (struct gdbarch *gdbarch, int bytes, const struct target_desc *tdesc) { struct remote_g_packet_data *data = gdbarch_data (gdbarch, remote_g_packet_data_handle); struct remote_g_packet_guess new_guess, *guess; int ix; gdb_assert (tdesc != NULL); for (ix = 0; VEC_iterate (remote_g_packet_guess_s, data->guesses, ix, guess); ix++) if (guess->bytes == bytes) internal_error (__FILE__, __LINE__, "Duplicate g packet description added for size %d", bytes); new_guess.bytes = bytes; new_guess.tdesc = tdesc; VEC_safe_push (remote_g_packet_guess_s, data->guesses, &new_guess); } /* Return 1 if remote_read_description would do anything on this target and architecture, 0 otherwise. */ static int remote_read_description_p (struct target_ops *target) { struct remote_g_packet_data *data = gdbarch_data (target_gdbarch, remote_g_packet_data_handle); if (!VEC_empty (remote_g_packet_guess_s, data->guesses)) return 1; return 0; } static const struct target_desc * remote_read_description (struct target_ops *target) { struct remote_g_packet_data *data = gdbarch_data (target_gdbarch, remote_g_packet_data_handle); /* Do not try this during initial connection, when we do not know whether there is a running but stopped thread. */ if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) return NULL; if (!VEC_empty (remote_g_packet_guess_s, data->guesses)) { struct remote_g_packet_guess *guess; int ix; int bytes = send_g_packet (); for (ix = 0; VEC_iterate (remote_g_packet_guess_s, data->guesses, ix, guess); ix++) if (guess->bytes == bytes) return guess->tdesc; /* We discard the g packet. A minor optimization would be to hold on to it, and fill the register cache once we have selected an architecture, but it's too tricky to do safely. */ } return NULL; } /* Remote file transfer support. This is host-initiated I/O, not target-initiated; for target-initiated, see remote-fileio.c. */ /* If *LEFT is at least the length of STRING, copy STRING to *BUFFER, update *BUFFER to point to the new end of the buffer, and decrease *LEFT. Otherwise raise an error. */ static void remote_buffer_add_string (char **buffer, int *left, char *string) { int len = strlen (string); if (len > *left) error (_("Packet too long for target.")); memcpy (*buffer, string, len); *buffer += len; *left -= len; /* NUL-terminate the buffer as a convenience, if there is room. */ if (*left) **buffer = '\0'; } /* If *LEFT is large enough, hex encode LEN bytes from BYTES into *BUFFER, update *BUFFER to point to the new end of the buffer, and decrease *LEFT. Otherwise raise an error. */ static void remote_buffer_add_bytes (char **buffer, int *left, const gdb_byte *bytes, int len) { if (2 * len > *left) error (_("Packet too long for target.")); bin2hex (bytes, *buffer, len); *buffer += 2 * len; *left -= 2 * len; /* NUL-terminate the buffer as a convenience, if there is room. */ if (*left) **buffer = '\0'; } /* If *LEFT is large enough, convert VALUE to hex and add it to *BUFFER, update *BUFFER to point to the new end of the buffer, and decrease *LEFT. Otherwise raise an error. */ static void remote_buffer_add_int (char **buffer, int *left, ULONGEST value) { int len = hexnumlen (value); if (len > *left) error (_("Packet too long for target.")); hexnumstr (*buffer, value); *buffer += len; *left -= len; /* NUL-terminate the buffer as a convenience, if there is room. */ if (*left) **buffer = '\0'; } /* Parse an I/O result packet from BUFFER. Set RETCODE to the return value, *REMOTE_ERRNO to the remote error number or zero if none was included, and *ATTACHMENT to point to the start of the annex if any. The length of the packet isn't needed here; there may be NUL bytes in BUFFER, but they will be after *ATTACHMENT. Return 0 if the packet could be parsed, -1 if it could not. If -1 is returned, the other variables may not be initialized. */ static int remote_hostio_parse_result (char *buffer, int *retcode, int *remote_errno, char **attachment) { char *p, *p2; *remote_errno = 0; *attachment = NULL; if (buffer[0] != 'F') return -1; errno = 0; *retcode = strtol (&buffer[1], &p, 16); if (errno != 0 || p == &buffer[1]) return -1; /* Check for ",errno". */ if (*p == ',') { errno = 0; *remote_errno = strtol (p + 1, &p2, 16); if (errno != 0 || p + 1 == p2) return -1; p = p2; } /* Check for ";attachment". If there is no attachment, the packet should end here. */ if (*p == ';') { *attachment = p + 1; return 0; } else if (*p == '\0') return 0; else return -1; } /* Send a prepared I/O packet to the target and read its response. The prepared packet is in the global RS->BUF before this function is called, and the answer is there when we return. COMMAND_BYTES is the length of the request to send, which may include binary data. WHICH_PACKET is the packet configuration to check before attempting a packet. If an error occurs, *REMOTE_ERRNO is set to the error number and -1 is returned. Otherwise the value returned by the function is returned. ATTACHMENT and ATTACHMENT_LEN should be non-NULL if and only if an attachment is expected; an error will be reported if there's a mismatch. If one is found, *ATTACHMENT will be set to point into the packet buffer and *ATTACHMENT_LEN will be set to the attachment's length. */ static int remote_hostio_send_command (int command_bytes, int which_packet, int *remote_errno, char **attachment, int *attachment_len) { struct remote_state *rs = get_remote_state (); int ret, bytes_read; char *attachment_tmp; if (!remote_desc || remote_protocol_packets[which_packet].support == PACKET_DISABLE) { *remote_errno = FILEIO_ENOSYS; return -1; } putpkt_binary (rs->buf, command_bytes); bytes_read = getpkt_sane (&rs->buf, &rs->buf_size, 0); /* If it timed out, something is wrong. Don't try to parse the buffer. */ if (bytes_read < 0) { *remote_errno = FILEIO_EINVAL; return -1; } switch (packet_ok (rs->buf, &remote_protocol_packets[which_packet])) { case PACKET_ERROR: *remote_errno = FILEIO_EINVAL; return -1; case PACKET_UNKNOWN: *remote_errno = FILEIO_ENOSYS; return -1; case PACKET_OK: break; } if (remote_hostio_parse_result (rs->buf, &ret, remote_errno, &attachment_tmp)) { *remote_errno = FILEIO_EINVAL; return -1; } /* Make sure we saw an attachment if and only if we expected one. */ if ((attachment_tmp == NULL && attachment != NULL) || (attachment_tmp != NULL && attachment == NULL)) { *remote_errno = FILEIO_EINVAL; return -1; } /* If an attachment was found, it must point into the packet buffer; work out how many bytes there were. */ if (attachment_tmp != NULL) { *attachment = attachment_tmp; *attachment_len = bytes_read - (*attachment - rs->buf); } return ret; } /* Open FILENAME on the remote target, using FLAGS and MODE. Return a remote file descriptor, or -1 if an error occurs (and set *REMOTE_ERRNO). */ static int remote_hostio_open (const char *filename, int flags, int mode, int *remote_errno) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; int left = get_remote_packet_size () - 1; remote_buffer_add_string (&p, &left, "vFile:open:"); remote_buffer_add_bytes (&p, &left, (const gdb_byte *) filename, strlen (filename)); remote_buffer_add_string (&p, &left, ","); remote_buffer_add_int (&p, &left, flags); remote_buffer_add_string (&p, &left, ","); remote_buffer_add_int (&p, &left, mode); return remote_hostio_send_command (p - rs->buf, PACKET_vFile_open, remote_errno, NULL, NULL); } /* Write up to LEN bytes from WRITE_BUF to FD on the remote target. Return the number of bytes written, or -1 if an error occurs (and set *REMOTE_ERRNO). */ static int remote_hostio_pwrite (int fd, const gdb_byte *write_buf, int len, ULONGEST offset, int *remote_errno) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; int left = get_remote_packet_size (); int out_len; remote_buffer_add_string (&p, &left, "vFile:pwrite:"); remote_buffer_add_int (&p, &left, fd); remote_buffer_add_string (&p, &left, ","); remote_buffer_add_int (&p, &left, offset); remote_buffer_add_string (&p, &left, ","); p += remote_escape_output (write_buf, len, p, &out_len, get_remote_packet_size () - (p - rs->buf)); return remote_hostio_send_command (p - rs->buf, PACKET_vFile_pwrite, remote_errno, NULL, NULL); } /* Read up to LEN bytes FD on the remote target into READ_BUF Return the number of bytes read, or -1 if an error occurs (and set *REMOTE_ERRNO). */ static int remote_hostio_pread (int fd, gdb_byte *read_buf, int len, ULONGEST offset, int *remote_errno) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; char *attachment; int left = get_remote_packet_size (); int ret, attachment_len; int read_len; remote_buffer_add_string (&p, &left, "vFile:pread:"); remote_buffer_add_int (&p, &left, fd); remote_buffer_add_string (&p, &left, ","); remote_buffer_add_int (&p, &left, len); remote_buffer_add_string (&p, &left, ","); remote_buffer_add_int (&p, &left, offset); ret = remote_hostio_send_command (p - rs->buf, PACKET_vFile_pread, remote_errno, &attachment, &attachment_len); if (ret < 0) return ret; read_len = remote_unescape_input (attachment, attachment_len, read_buf, len); if (read_len != ret) error (_("Read returned %d, but %d bytes."), ret, (int) read_len); return ret; } /* Close FD on the remote target. Return 0, or -1 if an error occurs (and set *REMOTE_ERRNO). */ static int remote_hostio_close (int fd, int *remote_errno) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; int left = get_remote_packet_size () - 1; remote_buffer_add_string (&p, &left, "vFile:close:"); remote_buffer_add_int (&p, &left, fd); return remote_hostio_send_command (p - rs->buf, PACKET_vFile_close, remote_errno, NULL, NULL); } /* Unlink FILENAME on the remote target. Return 0, or -1 if an error occurs (and set *REMOTE_ERRNO). */ static int remote_hostio_unlink (const char *filename, int *remote_errno) { struct remote_state *rs = get_remote_state (); char *p = rs->buf; int left = get_remote_packet_size () - 1; remote_buffer_add_string (&p, &left, "vFile:unlink:"); remote_buffer_add_bytes (&p, &left, (const gdb_byte *) filename, strlen (filename)); return remote_hostio_send_command (p - rs->buf, PACKET_vFile_unlink, remote_errno, NULL, NULL); } static int remote_fileio_errno_to_host (int errnum) { switch (errnum) { case FILEIO_EPERM: return EPERM; case FILEIO_ENOENT: return ENOENT; case FILEIO_EINTR: return EINTR; case FILEIO_EIO: return EIO; case FILEIO_EBADF: return EBADF; case FILEIO_EACCES: return EACCES; case FILEIO_EFAULT: return EFAULT; case FILEIO_EBUSY: return EBUSY; case FILEIO_EEXIST: return EEXIST; case FILEIO_ENODEV: return ENODEV; case FILEIO_ENOTDIR: return ENOTDIR; case FILEIO_EISDIR: return EISDIR; case FILEIO_EINVAL: return EINVAL; case FILEIO_ENFILE: return ENFILE; case FILEIO_EMFILE: return EMFILE; case FILEIO_EFBIG: return EFBIG; case FILEIO_ENOSPC: return ENOSPC; case FILEIO_ESPIPE: return ESPIPE; case FILEIO_EROFS: return EROFS; case FILEIO_ENOSYS: return ENOSYS; case FILEIO_ENAMETOOLONG: return ENAMETOOLONG; } return -1; } static char * remote_hostio_error (int errnum) { int host_error = remote_fileio_errno_to_host (errnum); if (host_error == -1) error (_("Unknown remote I/O error %d"), errnum); else error (_("Remote I/O error: %s"), safe_strerror (host_error)); } static void remote_hostio_close_cleanup (void *opaque) { int fd = *(int *) opaque; int remote_errno; remote_hostio_close (fd, &remote_errno); } static void * remote_bfd_iovec_open (struct bfd *abfd, void *open_closure) { const char *filename = bfd_get_filename (abfd); int fd, remote_errno; int *stream; gdb_assert (remote_filename_p (filename)); fd = remote_hostio_open (filename + 7, FILEIO_O_RDONLY, 0, &remote_errno); if (fd == -1) { errno = remote_fileio_errno_to_host (remote_errno); bfd_set_error (bfd_error_system_call); return NULL; } stream = xmalloc (sizeof (int)); *stream = fd; return stream; } static int remote_bfd_iovec_close (struct bfd *abfd, void *stream) { int fd = *(int *)stream; int remote_errno; xfree (stream); /* Ignore errors on close; these may happen if the remote connection was already torn down. */ remote_hostio_close (fd, &remote_errno); return 1; } static file_ptr remote_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, file_ptr nbytes, file_ptr offset) { int fd = *(int *)stream; int remote_errno; file_ptr pos, bytes; pos = 0; while (nbytes > pos) { bytes = remote_hostio_pread (fd, (char *)buf + pos, nbytes - pos, offset + pos, &remote_errno); if (bytes == 0) /* Success, but no bytes, means end-of-file. */ break; if (bytes == -1) { errno = remote_fileio_errno_to_host (remote_errno); bfd_set_error (bfd_error_system_call); return -1; } pos += bytes; } return pos; } static int remote_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb) { /* FIXME: We should probably implement remote_hostio_stat. */ sb->st_size = INT_MAX; return 0; } int remote_filename_p (const char *filename) { return strncmp (filename, "remote:", 7) == 0; } bfd * remote_bfd_open (const char *remote_file, const char *target) { return bfd_openr_iovec (remote_file, target, remote_bfd_iovec_open, NULL, remote_bfd_iovec_pread, remote_bfd_iovec_close, remote_bfd_iovec_stat); } void remote_file_put (const char *local_file, const char *remote_file, int from_tty) { struct cleanup *back_to, *close_cleanup; int retcode, fd, remote_errno, bytes, io_size; FILE *file; gdb_byte *buffer; int bytes_in_buffer; int saw_eof; ULONGEST offset; if (!remote_desc) error (_("command can only be used with remote target")); file = fopen (local_file, "rb"); if (file == NULL) perror_with_name (local_file); back_to = make_cleanup_fclose (file); fd = remote_hostio_open (remote_file, (FILEIO_O_WRONLY | FILEIO_O_CREAT | FILEIO_O_TRUNC), 0700, &remote_errno); if (fd == -1) remote_hostio_error (remote_errno); /* Send up to this many bytes at once. They won't all fit in the remote packet limit, so we'll transfer slightly fewer. */ io_size = get_remote_packet_size (); buffer = xmalloc (io_size); make_cleanup (xfree, buffer); close_cleanup = make_cleanup (remote_hostio_close_cleanup, &fd); bytes_in_buffer = 0; saw_eof = 0; offset = 0; while (bytes_in_buffer || !saw_eof) { if (!saw_eof) { bytes = fread (buffer + bytes_in_buffer, 1, io_size - bytes_in_buffer, file); if (bytes == 0) { if (ferror (file)) error (_("Error reading %s."), local_file); else { /* EOF. Unless there is something still in the buffer from the last iteration, we are done. */ saw_eof = 1; if (bytes_in_buffer == 0) break; } } } else bytes = 0; bytes += bytes_in_buffer; bytes_in_buffer = 0; retcode = remote_hostio_pwrite (fd, buffer, bytes, offset, &remote_errno); if (retcode < 0) remote_hostio_error (remote_errno); else if (retcode == 0) error (_("Remote write of %d bytes returned 0!"), bytes); else if (retcode < bytes) { /* Short write. Save the rest of the read data for the next write. */ bytes_in_buffer = bytes - retcode; memmove (buffer, buffer + retcode, bytes_in_buffer); } offset += retcode; } discard_cleanups (close_cleanup); if (remote_hostio_close (fd, &remote_errno)) remote_hostio_error (remote_errno); if (from_tty) printf_filtered (_("Successfully sent file \"%s\".\n"), local_file); do_cleanups (back_to); } void remote_file_get (const char *remote_file, const char *local_file, int from_tty) { struct cleanup *back_to, *close_cleanup; int fd, remote_errno, bytes, io_size; FILE *file; gdb_byte *buffer; ULONGEST offset; if (!remote_desc) error (_("command can only be used with remote target")); fd = remote_hostio_open (remote_file, FILEIO_O_RDONLY, 0, &remote_errno); if (fd == -1) remote_hostio_error (remote_errno); file = fopen (local_file, "wb"); if (file == NULL) perror_with_name (local_file); back_to = make_cleanup_fclose (file); /* Send up to this many bytes at once. They won't all fit in the remote packet limit, so we'll transfer slightly fewer. */ io_size = get_remote_packet_size (); buffer = xmalloc (io_size); make_cleanup (xfree, buffer); close_cleanup = make_cleanup (remote_hostio_close_cleanup, &fd); offset = 0; while (1) { bytes = remote_hostio_pread (fd, buffer, io_size, offset, &remote_errno); if (bytes == 0) /* Success, but no bytes, means end-of-file. */ break; if (bytes == -1) remote_hostio_error (remote_errno); offset += bytes; bytes = fwrite (buffer, 1, bytes, file); if (bytes == 0) perror_with_name (local_file); } discard_cleanups (close_cleanup); if (remote_hostio_close (fd, &remote_errno)) remote_hostio_error (remote_errno); if (from_tty) printf_filtered (_("Successfully fetched file \"%s\".\n"), remote_file); do_cleanups (back_to); } void remote_file_delete (const char *remote_file, int from_tty) { int retcode, remote_errno; if (!remote_desc) error (_("command can only be used with remote target")); retcode = remote_hostio_unlink (remote_file, &remote_errno); if (retcode == -1) remote_hostio_error (remote_errno); if (from_tty) printf_filtered (_("Successfully deleted file \"%s\".\n"), remote_file); } static void remote_put_command (char *args, int from_tty) { struct cleanup *back_to; char **argv; if (args == NULL) error_no_arg (_("file to put")); argv = gdb_buildargv (args); back_to = make_cleanup_freeargv (argv); if (argv[0] == NULL || argv[1] == NULL || argv[2] != NULL) error (_("Invalid parameters to remote put")); remote_file_put (argv[0], argv[1], from_tty); do_cleanups (back_to); } static void remote_get_command (char *args, int from_tty) { struct cleanup *back_to; char **argv; if (args == NULL) error_no_arg (_("file to get")); argv = gdb_buildargv (args); back_to = make_cleanup_freeargv (argv); if (argv[0] == NULL || argv[1] == NULL || argv[2] != NULL) error (_("Invalid parameters to remote get")); remote_file_get (argv[0], argv[1], from_tty); do_cleanups (back_to); } static void remote_delete_command (char *args, int from_tty) { struct cleanup *back_to; char **argv; if (args == NULL) error_no_arg (_("file to delete")); argv = gdb_buildargv (args); back_to = make_cleanup_freeargv (argv); if (argv[0] == NULL || argv[1] != NULL) error (_("Invalid parameters to remote delete")); remote_file_delete (argv[0], from_tty); do_cleanups (back_to); } static void remote_command (char *args, int from_tty) { help_list (remote_cmdlist, "remote ", -1, gdb_stdout); } static int remote_can_execute_reverse (void) { if (remote_protocol_packets[PACKET_bs].support == PACKET_ENABLE || remote_protocol_packets[PACKET_bc].support == PACKET_ENABLE) return 1; else return 0; } static int remote_supports_non_stop (void) { return 1; } static int remote_supports_multi_process (void) { struct remote_state *rs = get_remote_state (); return remote_multi_process_p (rs); } int remote_supports_cond_tracepoints (void) { struct remote_state *rs = get_remote_state (); return rs->cond_tracepoints; } int remote_supports_fast_tracepoints (void) { struct remote_state *rs = get_remote_state (); return rs->fast_tracepoints; } static void remote_trace_init () { putpkt ("QTinit"); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Target does not support this command.")); } static void free_actions_list (char **actions_list); static void free_actions_list_cleanup_wrapper (void *); static void free_actions_list_cleanup_wrapper (void *al) { free_actions_list (al); } static void free_actions_list (char **actions_list) { int ndx; if (actions_list == 0) return; for (ndx = 0; actions_list[ndx]; ndx++) xfree (actions_list[ndx]); xfree (actions_list); } static void remote_download_tracepoint (struct breakpoint *t) { CORE_ADDR tpaddr; char tmp[40]; char buf[2048]; char **tdp_actions; char **stepping_actions; int ndx; struct cleanup *old_chain = NULL; struct agent_expr *aexpr; struct cleanup *aexpr_chain = NULL; char *pkt; encode_actions (t, &tdp_actions, &stepping_actions); old_chain = make_cleanup (free_actions_list_cleanup_wrapper, tdp_actions); (void) make_cleanup (free_actions_list_cleanup_wrapper, stepping_actions); tpaddr = t->loc->address; sprintf_vma (tmp, (t->loc ? tpaddr : 0)); sprintf (buf, "QTDP:%x:%s:%c:%lx:%x", t->number, tmp, /* address */ (t->enable_state == bp_enabled ? 'E' : 'D'), t->step_count, t->pass_count); /* Fast tracepoints are mostly handled by the target, but we can tell the target how big of an instruction block should be moved around. */ if (t->type == bp_fast_tracepoint) { /* Only test for support at download time; we may not know target capabilities at definition time. */ if (remote_supports_fast_tracepoints ()) { int isize; if (gdbarch_fast_tracepoint_valid_at (target_gdbarch, tpaddr, &isize, NULL)) sprintf (buf + strlen (buf), ":F%x", isize); else /* If it passed validation at definition but fails now, something is very wrong. */ internal_error (__FILE__, __LINE__, "Fast tracepoint not valid during download"); } else /* Fast tracepoints are functionally identical to regular tracepoints, so don't take lack of support as a reason to give up on the trace run. */ warning (_("Target does not support fast tracepoints, downloading %d as regular tracepoint"), t->number); } /* If the tracepoint has a conditional, make it into an agent expression and append to the definition. */ if (t->loc->cond) { /* Only test support at download time, we may not know target capabilities at definition time. */ if (remote_supports_cond_tracepoints ()) { aexpr = gen_eval_for_expr (t->loc->address, t->loc->cond); aexpr_chain = make_cleanup_free_agent_expr (aexpr); sprintf (buf + strlen (buf), ":X%x,", aexpr->len); pkt = buf + strlen (buf); for (ndx = 0; ndx < aexpr->len; ++ndx) pkt = pack_hex_byte (pkt, aexpr->buf[ndx]); *pkt = '\0'; do_cleanups (aexpr_chain); } else warning (_("Target does not support conditional tracepoints, ignoring tp %d cond"), t->number); } if (t->actions || *default_collect) strcat (buf, "-"); putpkt (buf); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Target does not support tracepoints.")); if (!t->actions && !*default_collect) return; /* do_single_steps (t); */ if (tdp_actions) { for (ndx = 0; tdp_actions[ndx]; ndx++) { QUIT; /* allow user to bail out with ^C */ sprintf (buf, "QTDP:-%x:%s:%s%c", t->number, tmp, /* address */ tdp_actions[ndx], ((tdp_actions[ndx + 1] || stepping_actions) ? '-' : 0)); putpkt (buf); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Error on target while setting tracepoints.")); } } if (stepping_actions) { for (ndx = 0; stepping_actions[ndx]; ndx++) { QUIT; /* allow user to bail out with ^C */ sprintf (buf, "QTDP:-%x:%s:%s%s%s", t->number, tmp, /* address */ ((ndx == 0) ? "S" : ""), stepping_actions[ndx], (stepping_actions[ndx + 1] ? "-" : "")); putpkt (buf); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Error on target while setting tracepoints.")); } } do_cleanups (old_chain); return; } static void remote_download_trace_state_variable (struct trace_state_variable *tsv) { struct remote_state *rs = get_remote_state (); char *p; sprintf (rs->buf, "QTDV:%x:%s:%x:", tsv->number, phex ((ULONGEST) tsv->initial_value, 8), tsv->builtin); p = rs->buf + strlen (rs->buf); if ((p - rs->buf) + strlen (tsv->name) * 2 >= get_remote_packet_size ()) error (_("Trace state variable name too long for tsv definition packet")); p += 2 * bin2hex ((gdb_byte *) (tsv->name), p, 0); *p++ = '\0'; putpkt (rs->buf); remote_get_noisy_reply (&target_buf, &target_buf_size); } static void remote_trace_set_readonly_regions () { asection *s; bfd_size_type size; bfd_vma lma; int anysecs = 0; if (!exec_bfd) return; /* No information to give. */ strcpy (target_buf, "QTro"); for (s = exec_bfd->sections; s; s = s->next) { char tmp1[40], tmp2[40]; if ((s->flags & SEC_LOAD) == 0 || /* (s->flags & SEC_CODE) == 0 || */ (s->flags & SEC_READONLY) == 0) continue; anysecs = 1; lma = s->lma; size = bfd_get_section_size (s); sprintf_vma (tmp1, lma); sprintf_vma (tmp2, lma + size); sprintf (target_buf + strlen (target_buf), ":%s,%s", tmp1, tmp2); } if (anysecs) { putpkt (target_buf); getpkt (&target_buf, &target_buf_size, 0); } } static void remote_trace_start () { putpkt ("QTStart"); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Bogus reply from target: %s"), target_buf); } static int remote_get_trace_status (struct trace_status *ts) { char *p, *p1, *p_temp; ULONGEST val; /* FIXME we need to get register block size some other way */ extern int trace_regblock_size; trace_regblock_size = get_remote_arch_state ()->sizeof_g_packet; putpkt ("qTStatus"); getpkt (&target_buf, &target_buf_size, 0); /* FIXME should handle more variety of replies */ p = target_buf; /* If the remote target doesn't do tracing, flag it. */ if (*p == '\0') return -1; /* We're working with a live target. */ ts->from_file = 0; /* Set some defaults. */ ts->running_known = 0; ts->stop_reason = trace_stop_reason_unknown; ts->traceframe_count = -1; ts->buffer_free = 0; if (*p++ != 'T') error (_("Bogus trace status reply from target: %s"), target_buf); parse_trace_status (p, ts); return ts->running; } static void remote_trace_stop () { putpkt ("QTStop"); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Bogus reply from target: %s"), target_buf); } static int remote_trace_find (enum trace_find_type type, int num, ULONGEST addr1, ULONGEST addr2, int *tpp) { struct remote_state *rs = get_remote_state (); char *p, *reply; int target_frameno = -1, target_tracept = -1; p = rs->buf; strcpy (p, "QTFrame:"); p = strchr (p, '\0'); switch (type) { case tfind_number: sprintf (p, "%x", num); break; case tfind_pc: sprintf (p, "pc:%s", phex_nz (addr1, 0)); break; case tfind_tp: sprintf (p, "tdp:%x", num); break; case tfind_range: sprintf (p, "range:%s:%s", phex_nz (addr1, 0), phex_nz (addr2, 0)); break; case tfind_outside: sprintf (p, "outside:%s:%s", phex_nz (addr1, 0), phex_nz (addr2, 0)); break; default: error ("Unknown trace find type %d", type); } putpkt (rs->buf); reply = remote_get_noisy_reply (&(rs->buf), &sizeof_pkt); while (reply && *reply) switch (*reply) { case 'F': if ((target_frameno = (int) strtol (++reply, &reply, 16)) == -1) error (_("Target failed to find requested trace frame.")); break; case 'T': if ((target_tracept = (int) strtol (++reply, &reply, 16)) == -1) error (_("Target failed to find requested trace frame.")); break; case 'O': /* "OK"? */ if (reply[1] == 'K' && reply[2] == '\0') reply += 2; else error (_("Bogus reply from target: %s"), reply); break; default: error (_("Bogus reply from target: %s"), reply); } if (tpp) *tpp = target_tracept; return target_frameno; } static int remote_get_trace_state_variable_value (int tsvnum, LONGEST *val) { struct remote_state *rs = get_remote_state (); char *reply; ULONGEST uval; sprintf (rs->buf, "qTV:%x", tsvnum); putpkt (rs->buf); reply = remote_get_noisy_reply (&target_buf, &target_buf_size); if (reply && *reply) { if (*reply == 'V') { unpack_varlen_hex (reply + 1, &uval); *val = (LONGEST) uval; return 1; } } return 0; } static int remote_save_trace_data (char *filename) { struct remote_state *rs = get_remote_state (); char *p, *reply; p = rs->buf; strcpy (p, "QTSave:"); p += strlen (p); if ((p - rs->buf) + strlen (filename) * 2 >= get_remote_packet_size ()) error (_("Remote file name too long for trace save packet")); p += 2 * bin2hex ((gdb_byte *) filename, p, 0); *p++ = '\0'; putpkt (rs->buf); remote_get_noisy_reply (&target_buf, &target_buf_size); return 0; } /* This is basically a memory transfer, but needs to be its own packet because we don't know how the target actually organizes its trace memory, plus we want to be able to ask for as much as possible, but not be unhappy if we don't get as much as we ask for. */ static LONGEST remote_get_raw_trace_data (gdb_byte *buf, ULONGEST offset, LONGEST len) { struct remote_state *rs = get_remote_state (); char *reply; char *p; int rslt; p = rs->buf; strcpy (p, "qTBuffer:"); p += strlen (p); p += hexnumstr (p, offset); *p++ = ','; p += hexnumstr (p, len); *p++ = '\0'; putpkt (rs->buf); reply = remote_get_noisy_reply (&target_buf, &target_buf_size); if (reply && *reply) { /* 'l' by itself means we're at the end of the buffer and there is nothing more to get. */ if (*reply == 'l') return 0; /* Convert the reply into binary. Limit the number of bytes to convert according to our passed-in buffer size, rather than what was returned in the packet; if the target is unexpectedly generous and gives us a bigger reply than we asked for, we don't want to crash. */ rslt = hex2bin (target_buf, buf, len); return rslt; } /* Something went wrong, flag as an error. */ return -1; } static void remote_set_disconnected_tracing (int val) { struct remote_state *rs = get_remote_state (); sprintf (rs->buf, "QTDisconnected:%x", val); putpkt (rs->buf); remote_get_noisy_reply (&target_buf, &target_buf_size); if (strcmp (target_buf, "OK")) error (_("Target does not support this command.")); } static int remote_core_of_thread (struct target_ops *ops, ptid_t ptid) { struct thread_info *info = find_thread_ptid (ptid); if (info && info->private) return info->private->core; return -1; } static void init_remote_ops (void) { remote_ops.to_shortname = "remote"; remote_ops.to_longname = "Remote serial target in gdb-specific protocol"; remote_ops.to_doc = "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ Specify the serial device it is connected to\n\ (e.g. /dev/ttyS0, /dev/ttya, COM1, etc.)."; remote_ops.to_open = remote_open; remote_ops.to_close = remote_close; remote_ops.to_detach = remote_detach; remote_ops.to_disconnect = remote_disconnect; remote_ops.to_resume = remote_resume; remote_ops.to_wait = remote_wait; remote_ops.to_fetch_registers = remote_fetch_registers; remote_ops.to_store_registers = remote_store_registers; remote_ops.to_prepare_to_store = remote_prepare_to_store; remote_ops.deprecated_xfer_memory = remote_xfer_memory; remote_ops.to_files_info = remote_files_info; remote_ops.to_insert_breakpoint = remote_insert_breakpoint; remote_ops.to_remove_breakpoint = remote_remove_breakpoint; remote_ops.to_stopped_by_watchpoint = remote_stopped_by_watchpoint; remote_ops.to_stopped_data_address = remote_stopped_data_address; remote_ops.to_can_use_hw_breakpoint = remote_check_watch_resources; remote_ops.to_insert_hw_breakpoint = remote_insert_hw_breakpoint; remote_ops.to_remove_hw_breakpoint = remote_remove_hw_breakpoint; remote_ops.to_insert_watchpoint = remote_insert_watchpoint; remote_ops.to_remove_watchpoint = remote_remove_watchpoint; remote_ops.to_kill = remote_kill; remote_ops.to_load = generic_load; remote_ops.to_mourn_inferior = remote_mourn; remote_ops.to_thread_alive = remote_thread_alive; remote_ops.to_find_new_threads = remote_threads_info; remote_ops.to_pid_to_str = remote_pid_to_str; remote_ops.to_extra_thread_info = remote_threads_extra_info; remote_ops.to_get_ada_task_ptid = remote_get_ada_task_ptid; remote_ops.to_stop = remote_stop; remote_ops.to_xfer_partial = remote_xfer_partial; remote_ops.to_rcmd = remote_rcmd; remote_ops.to_log_command = serial_log_command; remote_ops.to_get_thread_local_address = remote_get_thread_local_address; remote_ops.to_stratum = process_stratum; remote_ops.to_has_all_memory = default_child_has_all_memory; remote_ops.to_has_memory = default_child_has_memory; remote_ops.to_has_stack = default_child_has_stack; remote_ops.to_has_registers = default_child_has_registers; remote_ops.to_has_execution = default_child_has_execution; remote_ops.to_has_thread_control = tc_schedlock; /* can lock scheduler */ remote_ops.to_can_execute_reverse = remote_can_execute_reverse; remote_ops.to_magic = OPS_MAGIC; remote_ops.to_memory_map = remote_memory_map; remote_ops.to_flash_erase = remote_flash_erase; remote_ops.to_flash_done = remote_flash_done; remote_ops.to_read_description = remote_read_description; remote_ops.to_search_memory = remote_search_memory; remote_ops.to_can_async_p = remote_can_async_p; remote_ops.to_is_async_p = remote_is_async_p; remote_ops.to_async = remote_async; remote_ops.to_async_mask = remote_async_mask; remote_ops.to_terminal_inferior = remote_terminal_inferior; remote_ops.to_terminal_ours = remote_terminal_ours; remote_ops.to_supports_non_stop = remote_supports_non_stop; remote_ops.to_supports_multi_process = remote_supports_multi_process; remote_ops.to_trace_init = remote_trace_init; remote_ops.to_download_tracepoint = remote_download_tracepoint; remote_ops.to_download_trace_state_variable = remote_download_trace_state_variable; remote_ops.to_trace_set_readonly_regions = remote_trace_set_readonly_regions; remote_ops.to_trace_start = remote_trace_start; remote_ops.to_get_trace_status = remote_get_trace_status; remote_ops.to_trace_stop = remote_trace_stop; remote_ops.to_trace_find = remote_trace_find; remote_ops.to_get_trace_state_variable_value = remote_get_trace_state_variable_value; remote_ops.to_save_trace_data = remote_save_trace_data; remote_ops.to_upload_tracepoints = remote_upload_tracepoints; remote_ops.to_upload_trace_state_variables = remote_upload_trace_state_variables; remote_ops.to_get_raw_trace_data = remote_get_raw_trace_data; remote_ops.to_set_disconnected_tracing = remote_set_disconnected_tracing; remote_ops.to_core_of_thread = remote_core_of_thread; } /* Set up the extended remote vector by making a copy of the standard remote vector and adding to it. */ static void init_extended_remote_ops (void) { extended_remote_ops = remote_ops; extended_remote_ops.to_shortname = "extended-remote"; extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol"; extended_remote_ops.to_doc = "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ Specify the serial device it is connected to (e.g. /dev/ttya)."; extended_remote_ops.to_open = extended_remote_open; extended_remote_ops.to_create_inferior = extended_remote_create_inferior; extended_remote_ops.to_mourn_inferior = extended_remote_mourn; extended_remote_ops.to_detach = extended_remote_detach; extended_remote_ops.to_attach = extended_remote_attach; extended_remote_ops.to_kill = extended_remote_kill; } static int remote_can_async_p (void) { if (!target_async_permitted) /* We only enable async when the user specifically asks for it. */ return 0; /* We're async whenever the serial device is. */ return remote_async_mask_value && serial_can_async_p (remote_desc); } static int remote_is_async_p (void) { if (!target_async_permitted) /* We only enable async when the user specifically asks for it. */ return 0; /* We're async whenever the serial device is. */ return remote_async_mask_value && serial_is_async_p (remote_desc); } /* Pass the SERIAL event on and up to the client. One day this code will be able to delay notifying the client of an event until the point where an entire packet has been received. */ static void (*async_client_callback) (enum inferior_event_type event_type, void *context); static void *async_client_context; static serial_event_ftype remote_async_serial_handler; static void remote_async_serial_handler (struct serial *scb, void *context) { /* Don't propogate error information up to the client. Instead let the client find out about the error by querying the target. */ async_client_callback (INF_REG_EVENT, async_client_context); } static void remote_async_inferior_event_handler (gdb_client_data data) { inferior_event_handler (INF_REG_EVENT, NULL); } static void remote_async_get_pending_events_handler (gdb_client_data data) { remote_get_pending_stop_replies (); } static void remote_async (void (*callback) (enum inferior_event_type event_type, void *context), void *context) { if (remote_async_mask_value == 0) internal_error (__FILE__, __LINE__, _("Calling remote_async when async is masked")); if (callback != NULL) { serial_async (remote_desc, remote_async_serial_handler, NULL); async_client_callback = callback; async_client_context = context; } else serial_async (remote_desc, NULL, NULL); } static int remote_async_mask (int new_mask) { int curr_mask = remote_async_mask_value; remote_async_mask_value = new_mask; return curr_mask; } static void set_remote_cmd (char *args, int from_tty) { help_list (remote_set_cmdlist, "set remote ", -1, gdb_stdout); } static void show_remote_cmd (char *args, int from_tty) { /* We can't just use cmd_show_list here, because we want to skip the redundant "show remote Z-packet" and the legacy aliases. */ struct cleanup *showlist_chain; struct cmd_list_element *list = remote_show_cmdlist; showlist_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "showlist"); for (; list != NULL; list = list->next) if (strcmp (list->name, "Z-packet") == 0) continue; else if (list->type == not_set_cmd) /* Alias commands are exactly like the original, except they don't have the normal type. */ continue; else { struct cleanup *option_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "option"); ui_out_field_string (uiout, "name", list->name); ui_out_text (uiout, ": "); if (list->type == show_cmd) do_setshow_command ((char *) NULL, from_tty, list); else cmd_func (list, NULL, from_tty); /* Close the tuple. */ do_cleanups (option_chain); } /* Close the tuple. */ do_cleanups (showlist_chain); } /* Function to be called whenever a new objfile (shlib) is detected. */ static void remote_new_objfile (struct objfile *objfile) { if (remote_desc != 0) /* Have a remote connection. */ remote_check_symbols (objfile); } /* Pull all the tracepoints defined on the target and create local data structures representing them. We don't want to create real tracepoints yet, we don't want to mess up the user's existing collection. */ static int remote_upload_tracepoints (struct uploaded_tp **utpp) { struct remote_state *rs = get_remote_state (); char *p; /* Ask for a first packet of tracepoint definition. */ putpkt ("qTfP"); getpkt (&rs->buf, &rs->buf_size, 0); p = rs->buf; while (*p && *p != 'l') { parse_tracepoint_definition (p, utpp); /* Ask for another packet of tracepoint definition. */ putpkt ("qTsP"); getpkt (&rs->buf, &rs->buf_size, 0); p = rs->buf; } return 0; } static int remote_upload_trace_state_variables (struct uploaded_tsv **utsvp) { struct remote_state *rs = get_remote_state (); char *p; /* Ask for a first packet of variable definition. */ putpkt ("qTfV"); getpkt (&rs->buf, &rs->buf_size, 0); p = rs->buf; while (*p && *p != 'l') { parse_tsv_definition (p, utsvp); /* Ask for another packet of variable definition. */ putpkt ("qTsV"); getpkt (&rs->buf, &rs->buf_size, 0); p = rs->buf; } return 0; } void _initialize_remote (void) { struct remote_state *rs; struct cmd_list_element *cmd; char *cmd_name; /* architecture specific data */ remote_gdbarch_data_handle = gdbarch_data_register_post_init (init_remote_state); remote_g_packet_data_handle = gdbarch_data_register_pre_init (remote_g_packet_data_init); /* Initialize the per-target state. At the moment there is only one of these, not one per target. Only one target is active at a time. The default buffer size is unimportant; it will be expanded whenever a larger buffer is needed. */ rs = get_remote_state_raw (); rs->buf_size = 400; rs->buf = xmalloc (rs->buf_size); init_remote_ops (); add_target (&remote_ops); init_extended_remote_ops (); add_target (&extended_remote_ops); /* Hook into new objfile notification. */ observer_attach_new_objfile (remote_new_objfile); /* Set up signal handlers. */ sigint_remote_token = create_async_signal_handler (async_remote_interrupt, NULL); sigint_remote_twice_token = create_async_signal_handler (inferior_event_handler_wrapper, NULL); #if 0 init_remote_threadtests (); #endif /* set/show remote ... */ add_prefix_cmd ("remote", class_maintenance, set_remote_cmd, _("\ Remote protocol specific variables\n\ Configure various remote-protocol specific variables such as\n\ the packets being used"), &remote_set_cmdlist, "set remote ", 0 /* allow-unknown */, &setlist); add_prefix_cmd ("remote", class_maintenance, show_remote_cmd, _("\ Remote protocol specific variables\n\ Configure various remote-protocol specific variables such as\n\ the packets being used"), &remote_show_cmdlist, "show remote ", 0 /* allow-unknown */, &showlist); add_cmd ("compare-sections", class_obscure, compare_sections_command, _("\ Compare section data on target to the exec file.\n\ Argument is a single section name (default: all loaded sections)."), &cmdlist); add_cmd ("packet", class_maintenance, packet_command, _("\ Send an arbitrary packet to a remote target.\n\ maintenance packet TEXT\n\ If GDB is talking to an inferior via the GDB serial protocol, then\n\ this command sends the string TEXT to the inferior, and displays the\n\ response packet. GDB supplies the initial `$' character, and the\n\ terminating `#' character and checksum."), &maintenancelist); add_setshow_boolean_cmd ("remotebreak", no_class, &remote_break, _("\ Set whether to send break if interrupted."), _("\ Show whether to send break if interrupted."), _("\ If set, a break, instead of a cntrl-c, is sent to the remote target."), set_remotebreak, show_remotebreak, &setlist, &showlist); cmd_name = "remotebreak"; cmd = lookup_cmd (&cmd_name, setlist, "", -1, 1); deprecate_cmd (cmd, "set remote interrupt-sequence"); cmd_name = "remotebreak"; /* needed because lookup_cmd updates the pointer */ cmd = lookup_cmd (&cmd_name, showlist, "", -1, 1); deprecate_cmd (cmd, "show remote interrupt-sequence"); add_setshow_enum_cmd ("interrupt-sequence", class_support, interrupt_sequence_modes, &interrupt_sequence_mode, _("\ Set interrupt sequence to remote target."), _("\ Show interrupt sequence to remote target."), _("\ Valid value is \"Ctrl-C\", \"BREAK\" or \"BREAK-g\". The default is \"Ctrl-C\"."), NULL, show_interrupt_sequence, &remote_set_cmdlist, &remote_show_cmdlist); add_setshow_boolean_cmd ("interrupt-on-connect", class_support, &interrupt_on_connect, _("\ Set whether interrupt-sequence is sent to remote target when gdb connects to."), _(" \ Show whether interrupt-sequence is sent to remote target when gdb connects to."), _(" \ If set, interrupt sequence is sent to remote target."), NULL, NULL, &remote_set_cmdlist, &remote_show_cmdlist); /* Install commands for configuring memory read/write packets. */ add_cmd ("remotewritesize", no_class, set_memory_write_packet_size, _("\ Set the maximum number of bytes per memory write packet (deprecated)."), &setlist); add_cmd ("remotewritesize", no_class, show_memory_write_packet_size, _("\ Show the maximum number of bytes per memory write packet (deprecated)."), &showlist); add_cmd ("memory-write-packet-size", no_class, set_memory_write_packet_size, _("\ Set the maximum number of bytes per memory-write packet.\n\ Specify the number of bytes in a packet or 0 (zero) for the\n\ default packet size. The actual limit is further reduced\n\ dependent on the target. Specify ``fixed'' to disable the\n\ further restriction and ``limit'' to enable that restriction."), &remote_set_cmdlist); add_cmd ("memory-read-packet-size", no_class, set_memory_read_packet_size, _("\ Set the maximum number of bytes per memory-read packet.\n\ Specify the number of bytes in a packet or 0 (zero) for the\n\ default packet size. The actual limit is further reduced\n\ dependent on the target. Specify ``fixed'' to disable the\n\ further restriction and ``limit'' to enable that restriction."), &remote_set_cmdlist); add_cmd ("memory-write-packet-size", no_class, show_memory_write_packet_size, _("Show the maximum number of bytes per memory-write packet."), &remote_show_cmdlist); add_cmd ("memory-read-packet-size", no_class, show_memory_read_packet_size, _("Show the maximum number of bytes per memory-read packet."), &remote_show_cmdlist); add_setshow_zinteger_cmd ("hardware-watchpoint-limit", no_class, &remote_hw_watchpoint_limit, _("\ Set the maximum number of target hardware watchpoints."), _("\ Show the maximum number of target hardware watchpoints."), _("\ Specify a negative limit for unlimited."), NULL, NULL, /* FIXME: i18n: The maximum number of target hardware watchpoints is %s. */ &remote_set_cmdlist, &remote_show_cmdlist); add_setshow_zinteger_cmd ("hardware-breakpoint-limit", no_class, &remote_hw_breakpoint_limit, _("\ Set the maximum number of target hardware breakpoints."), _("\ Show the maximum number of target hardware breakpoints."), _("\ Specify a negative limit for unlimited."), NULL, NULL, /* FIXME: i18n: The maximum number of target hardware breakpoints is %s. */ &remote_set_cmdlist, &remote_show_cmdlist); add_setshow_integer_cmd ("remoteaddresssize", class_obscure, &remote_address_size, _("\ Set the maximum size of the address (in bits) in a memory packet."), _("\ Show the maximum size of the address (in bits) in a memory packet."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_packet_config_cmd (&remote_protocol_packets[PACKET_X], "X", "binary-download", 1); add_packet_config_cmd (&remote_protocol_packets[PACKET_vCont], "vCont", "verbose-resume", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_QPassSignals], "QPassSignals", "pass-signals", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qSymbol], "qSymbol", "symbol-lookup", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_P], "P", "set-register", 1); add_packet_config_cmd (&remote_protocol_packets[PACKET_p], "p", "fetch-register", 1); add_packet_config_cmd (&remote_protocol_packets[PACKET_Z0], "Z0", "software-breakpoint", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_Z1], "Z1", "hardware-breakpoint", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_Z2], "Z2", "write-watchpoint", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_Z3], "Z3", "read-watchpoint", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_Z4], "Z4", "access-watchpoint", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_auxv], "qXfer:auxv:read", "read-aux-vector", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_features], "qXfer:features:read", "target-features", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_libraries], "qXfer:libraries:read", "library-info", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_memory_map], "qXfer:memory-map:read", "memory-map", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_spu_read], "qXfer:spu:read", "read-spu-object", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_spu_write], "qXfer:spu:write", "write-spu-object", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_osdata], "qXfer:osdata:read", "osdata", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_threads], "qXfer:threads:read", "threads", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_siginfo_read], "qXfer:siginfo:read", "read-siginfo-object", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_siginfo_write], "qXfer:siginfo:write", "write-siginfo-object", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qGetTLSAddr], "qGetTLSAddr", "get-thread-local-storage-address", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_bc], "bc", "reverse-continue", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_bs], "bs", "reverse-step", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qSupported], "qSupported", "supported-packets", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qSearch_memory], "qSearch:memory", "search-memory", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_open], "vFile:open", "hostio-open", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_pread], "vFile:pread", "hostio-pread", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_pwrite], "vFile:pwrite", "hostio-pwrite", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_close], "vFile:close", "hostio-close", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_unlink], "vFile:unlink", "hostio-unlink", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vAttach], "vAttach", "attach", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vRun], "vRun", "run", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_QStartNoAckMode], "QStartNoAckMode", "noack", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_vKill], "vKill", "kill", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_qAttached], "qAttached", "query-attached", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_ConditionalTracepoints], "ConditionalTracepoints", "conditional-tracepoints", 0); add_packet_config_cmd (&remote_protocol_packets[PACKET_FastTracepoints], "FastTracepoints", "fast-tracepoints", 0); /* Keep the old ``set remote Z-packet ...'' working. Each individual Z sub-packet has its own set and show commands, but users may have sets to this variable in their .gdbinit files (or in their documentation). */ add_setshow_auto_boolean_cmd ("Z-packet", class_obscure, &remote_Z_packet_detect, _("\ Set use of remote protocol `Z' packets"), _("\ Show use of remote protocol `Z' packets "), _("\ When set, GDB will attempt to use the remote breakpoint and watchpoint\n\ packets."), set_remote_protocol_Z_packet_cmd, show_remote_protocol_Z_packet_cmd, /* FIXME: i18n: Use of remote protocol `Z' packets is %s. */ &remote_set_cmdlist, &remote_show_cmdlist); add_prefix_cmd ("remote", class_files, remote_command, _("\ Manipulate files on the remote system\n\ Transfer files to and from the remote target system."), &remote_cmdlist, "remote ", 0 /* allow-unknown */, &cmdlist); add_cmd ("put", class_files, remote_put_command, _("Copy a local file to the remote system."), &remote_cmdlist); add_cmd ("get", class_files, remote_get_command, _("Copy a remote file to the local system."), &remote_cmdlist); add_cmd ("delete", class_files, remote_delete_command, _("Delete a remote file."), &remote_cmdlist); remote_exec_file = xstrdup (""); add_setshow_string_noescape_cmd ("exec-file", class_files, &remote_exec_file, _("\ Set the remote pathname for \"run\""), _("\ Show the remote pathname for \"run\""), NULL, NULL, NULL, &remote_set_cmdlist, &remote_show_cmdlist); /* Eventually initialize fileio. See fileio.c */ initialize_remote_fileio (remote_set_cmdlist, remote_show_cmdlist); /* Take advantage of the fact that the LWP field is not used, to tag special ptids with it set to != 0. */ magic_null_ptid = ptid_build (42000, 1, -1); not_sent_ptid = ptid_build (42000, 1, -2); any_thread_ptid = ptid_build (42000, 1, 0); target_buf_size = 2048; target_buf = xmalloc (target_buf_size); }
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