URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [remote-sim.c] - Rev 299
Go to most recent revision | Compare with Previous | Blame | View Log
/* Generic remote debugging interface for simulators. Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. Contributed by Cygnus Support. Steve Chamberlain (sac@cygnus.com). 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/>. */ #include "defs.h" #include "inferior.h" #include "value.h" #include "gdb_string.h" #include <ctype.h> #include <fcntl.h> #include <signal.h> #include <setjmp.h> #include <errno.h> #include "terminal.h" #include "target.h" #include "gdbcore.h" #include "gdb/callback.h" #include "gdb/remote-sim.h" #include "command.h" #include "regcache.h" #include "gdb_assert.h" #include "sim-regno.h" #include "arch-utils.h" #include "readline/readline.h" /* Prototypes */ extern void _initialize_remote_sim (void); static void dump_mem (char *buf, int len); static void init_callbacks (void); static void end_callbacks (void); static int gdb_os_write_stdout (host_callback *, const char *, int); static void gdb_os_flush_stdout (host_callback *); static int gdb_os_write_stderr (host_callback *, const char *, int); static void gdb_os_flush_stderr (host_callback *); static int gdb_os_poll_quit (host_callback *); /* printf_filtered is depreciated */ static void gdb_os_printf_filtered (host_callback *, const char *, ...); static void gdb_os_vprintf_filtered (host_callback *, const char *, va_list); static void gdb_os_evprintf_filtered (host_callback *, const char *, va_list); /* JPB fix for compatibility with latest binutils */ static void gdb_os_error (host_callback *, const char *, ...) #ifdef __GNUC__ __attribute__ ((__noreturn__)) #endif ; static void gdbsim_fetch_register (struct regcache *regcache, int regno); static void gdbsim_store_register (struct regcache *regcache, int regno); static void gdbsim_kill (void); static void gdbsim_load (char *prog, int fromtty); static void gdbsim_open (char *args, int from_tty); static void gdbsim_close (int quitting); static void gdbsim_detach (char *args, int from_tty); static void gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal); static ptid_t gdbsim_wait (ptid_t ptid, struct target_waitstatus *status); static void gdbsim_prepare_to_store (struct regcache *regcache); static void gdbsim_files_info (struct target_ops *target); static void gdbsim_mourn_inferior (void); static void gdbsim_stop (void); void simulator_command (char *args, int from_tty); /* Naming convention: sim_* are the interface to the simulator (see remote-sim.h). gdbsim_* are stuff which is internal to gdb. */ /* Forward data declarations */ extern struct target_ops gdbsim_ops; static int program_loaded = 0; /* We must keep track of whether the simulator has been opened or not because GDB can call a target's close routine twice, but sim_close doesn't allow this. We also need to record the result of sim_open so we can pass it back to the other sim_foo routines. */ static SIM_DESC gdbsim_desc = 0; static void dump_mem (char *buf, int len) { if (len <= 8) { if (len == 8 || len == 4) { long l[2]; memcpy (l, buf, len); printf_filtered ("\t0x%lx", l[0]); if (len == 8) printf_filtered (" 0x%lx", l[1]); printf_filtered ("\n"); } else { int i; printf_filtered ("\t"); for (i = 0; i < len; i++) printf_filtered ("0x%x ", buf[i]); printf_filtered ("\n"); } } } static host_callback gdb_callback; static int callbacks_initialized = 0; /* Initialize gdb_callback. */ static void init_callbacks (void) { if (!callbacks_initialized) { gdb_callback = default_callback; gdb_callback.init (&gdb_callback); gdb_callback.write_stdout = gdb_os_write_stdout; gdb_callback.flush_stdout = gdb_os_flush_stdout; gdb_callback.write_stderr = gdb_os_write_stderr; gdb_callback.flush_stderr = gdb_os_flush_stderr; gdb_callback.printf_filtered = gdb_os_printf_filtered; gdb_callback.vprintf_filtered = gdb_os_vprintf_filtered; gdb_callback.evprintf_filtered = gdb_os_evprintf_filtered; gdb_callback.error = gdb_os_error; gdb_callback.poll_quit = gdb_os_poll_quit; gdb_callback.magic = HOST_CALLBACK_MAGIC; callbacks_initialized = 1; } } /* Release callbacks (free resources used by them). */ static void end_callbacks (void) { if (callbacks_initialized) { gdb_callback.shutdown (&gdb_callback); callbacks_initialized = 0; } } /* GDB version of os_write_stdout callback. */ static int gdb_os_write_stdout (host_callback *p, const char *buf, int len) { int i; char b[2]; ui_file_write (gdb_stdtarg, buf, len); return len; } /* GDB version of os_flush_stdout callback. */ static void gdb_os_flush_stdout (host_callback *p) { gdb_flush (gdb_stdtarg); } /* GDB version of os_write_stderr callback. */ static int gdb_os_write_stderr (host_callback *p, const char *buf, int len) { int i; char b[2]; for (i = 0; i < len; i++) { b[0] = buf[i]; b[1] = 0; fputs_unfiltered (b, gdb_stdtargerr); } return len; } /* GDB version of os_flush_stderr callback. */ static void gdb_os_flush_stderr (host_callback *p) { gdb_flush (gdb_stdtargerr); } /* GDB version of printf_filtered callback. */ static void gdb_os_printf_filtered (host_callback * p, const char *format,...) { va_list args; va_start (args, format); vfprintf_filtered (gdb_stdout, format, args); va_end (args); } /* GDB version of error vprintf_filtered. */ static void gdb_os_vprintf_filtered (host_callback * p, const char *format, va_list ap) { vfprintf_filtered (gdb_stdout, format, ap); } /* GDB version of error evprintf_filtered. */ static void gdb_os_evprintf_filtered (host_callback * p, const char *format, va_list ap) { vfprintf_filtered (gdb_stderr, format, ap); } /* GDB version of error callback. JPB fixed for compatibility with latest BFD not to return. */ static void gdb_os_error (host_callback * p, const char *format,...) { if (deprecated_error_hook) (*deprecated_error_hook) (); else { va_list args; va_start (args, format); verror (format, args); va_end (args); } while (1) ; } int one2one_register_sim_regno (struct gdbarch *gdbarch, int regnum) { /* Only makes sense to supply raw registers. */ gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)); return regnum; } static void gdbsim_fetch_register (struct regcache *regcache, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); if (regno == -1) { for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++) gdbsim_fetch_register (regcache, regno); return; } switch (gdbarch_register_sim_regno (gdbarch, regno)) { case LEGACY_SIM_REGNO_IGNORE: break; case SIM_REGNO_DOES_NOT_EXIST: { /* For moment treat a `does not exist' register the same way as an ``unavailable'' register. */ char buf[MAX_REGISTER_SIZE]; int nr_bytes; memset (buf, 0, MAX_REGISTER_SIZE); regcache_raw_supply (regcache, regno, buf); break; } default: { static int warn_user = 1; char buf[MAX_REGISTER_SIZE]; int nr_bytes; gdb_assert (regno >= 0 && regno < gdbarch_num_regs (gdbarch)); memset (buf, 0, MAX_REGISTER_SIZE); nr_bytes = sim_fetch_register (gdbsim_desc, gdbarch_register_sim_regno (gdbarch, regno), buf, register_size (gdbarch, regno)); if (nr_bytes > 0 && nr_bytes != register_size (gdbarch, regno) && warn_user) { fprintf_unfiltered (gdb_stderr, "Size of register %s (%d/%d) incorrect (%d instead of %d))", gdbarch_register_name (gdbarch, regno), regno, gdbarch_register_sim_regno (gdbarch, regno), nr_bytes, register_size (gdbarch, regno)); warn_user = 0; } /* FIXME: cagney/2002-05-27: Should check `nr_bytes == 0' indicating that GDB and the SIM have different ideas about which registers are fetchable. */ /* Else if (nr_bytes < 0): an old simulator, that doesn't think to return the register size. Just assume all is ok. */ regcache_raw_supply (regcache, regno, buf); if (remote_debug) { printf_filtered ("gdbsim_fetch_register: %d", regno); /* FIXME: We could print something more intelligible. */ dump_mem (buf, register_size (gdbarch, regno)); } break; } } } static void gdbsim_store_register (struct regcache *regcache, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); if (regno == -1) { for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++) gdbsim_store_register (regcache, regno); return; } else if (gdbarch_register_sim_regno (gdbarch, regno) >= 0) { char tmp[MAX_REGISTER_SIZE]; int nr_bytes; regcache_cooked_read (regcache, regno, tmp); nr_bytes = sim_store_register (gdbsim_desc, gdbarch_register_sim_regno (gdbarch, regno), tmp, register_size (gdbarch, regno)); if (nr_bytes > 0 && nr_bytes != register_size (gdbarch, regno)) internal_error (__FILE__, __LINE__, _("Register size different to expected")); /* FIXME: cagney/2002-05-27: Should check `nr_bytes == 0' indicating that GDB and the SIM have different ideas about which registers are fetchable. */ if (remote_debug) { printf_filtered ("gdbsim_store_register: %d", regno); /* FIXME: We could print something more intelligible. */ dump_mem (tmp, register_size (gdbarch, regno)); } } } /* Kill the running program. This may involve closing any open files and releasing other resources acquired by the simulated program. */ static void gdbsim_kill (void) { if (remote_debug) printf_filtered ("gdbsim_kill\n"); /* There is no need to `kill' running simulator - the simulator is not running. Mourning it is enough. */ target_mourn_inferior (); } /* Load an executable file into the target process. This is expected to not only bring new code into the target process, but also to update GDB's symbol tables to match. */ static void gdbsim_load (char *args, int fromtty) { char **argv = buildargv (args); char *prog; if (argv == NULL) nomem (0); make_cleanup_freeargv (argv); prog = tilde_expand (argv[0]); if (argv[1] != NULL) error (_("GDB sim does not yet support a load offset.")); if (remote_debug) printf_filtered ("gdbsim_load: prog \"%s\"\n", prog); /* FIXME: We will print two messages on error. Need error to either not print anything if passed NULL or need another routine that doesn't take any arguments. */ if (sim_load (gdbsim_desc, prog, NULL, fromtty) == SIM_RC_FAIL) error (_("unable to load program")); /* FIXME: If a load command should reset the targets registers then a call to sim_create_inferior() should go here. */ program_loaded = 1; } /* Start an inferior process and set inferior_ptid to its pid. EXEC_FILE is the file to run. ARGS is a string containing the arguments to the program. ENV is the environment vector to pass. Errors reported with error(). On VxWorks and various standalone systems, we ignore exec_file. */ /* This is called not only when we first attach, but also when the user types "run" after having attached. */ static void gdbsim_create_inferior (char *exec_file, char *args, char **env, int from_tty) { int len; char *arg_buf, **argv; if (exec_file == 0 || exec_bfd == 0) warning (_("No executable file specified.")); if (!program_loaded) warning (_("No program loaded.")); if (remote_debug) printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n", (exec_file ? exec_file : "(NULL)"), args); gdbsim_kill (); remove_breakpoints (); init_wait_for_inferior (); if (exec_file != NULL) { len = strlen (exec_file) + 1 + strlen (args) + 1 + /*slop */ 10; arg_buf = (char *) alloca (len); arg_buf[0] = '\0'; strcat (arg_buf, exec_file); strcat (arg_buf, " "); strcat (arg_buf, args); argv = buildargv (arg_buf); make_cleanup_freeargv (argv); } else argv = NULL; sim_create_inferior (gdbsim_desc, exec_bfd, argv, env); inferior_ptid = pid_to_ptid (42); target_mark_running (&gdbsim_ops); insert_breakpoints (); /* Needed to get correct instruction in cache */ clear_proceed_status (); } /* The open routine takes the rest of the parameters from the command, and (if successful) pushes a new target onto the stack. Targets should supply this routine, if only to provide an error message. */ /* Called when selecting the simulator. EG: (gdb) target sim name. */ static void gdbsim_open (char *args, int from_tty) { int len; char *arg_buf; char **argv; if (remote_debug) printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)"); /* Remove current simulator if one exists. Only do this if the simulator has been opened because sim_close requires it. This is important because the call to push_target below will cause sim_close to be called if the simulator is already open, but push_target is called after sim_open! We can't move the call to push_target before the call to sim_open because sim_open may invoke `error'. */ if (gdbsim_desc != NULL) unpush_target (&gdbsim_ops); len = (7 + 1 /* gdbsim */ + strlen (" -E little") + strlen (" --architecture=xxxxxxxxxx") + (args ? strlen (args) : 0) + 50) /* slack */ ; arg_buf = (char *) alloca (len); strcpy (arg_buf, "gdbsim"); /* 7 */ /* Specify the byte order for the target when it is explicitly specified by the user (not auto detected). */ switch (selected_byte_order ()) { case BFD_ENDIAN_BIG: strcat (arg_buf, " -E big"); break; case BFD_ENDIAN_LITTLE: strcat (arg_buf, " -E little"); break; case BFD_ENDIAN_UNKNOWN: break; } /* Specify the architecture of the target when it has been explicitly specified */ if (selected_architecture_name () != NULL) { strcat (arg_buf, " --architecture="); strcat (arg_buf, selected_architecture_name ()); } /* finally, any explicit args */ if (args) { strcat (arg_buf, " "); /* 1 */ strcat (arg_buf, args); } argv = buildargv (arg_buf); if (argv == NULL) error (_("Insufficient memory available to allocate simulator arg list.")); make_cleanup_freeargv (argv); init_callbacks (); gdbsim_desc = sim_open (SIM_OPEN_DEBUG, &gdb_callback, exec_bfd, argv); if (gdbsim_desc == 0) error (_("unable to create simulator instance")); push_target (&gdbsim_ops); printf_filtered ("Connected to the simulator.\n"); /* There's nothing running after "target sim" or "load"; not until "run". */ inferior_ptid = null_ptid; target_mark_exited (&gdbsim_ops); } /* Does whatever cleanup is required for a target that we are no longer going to be calling. Argument says whether we are quitting gdb and should not get hung in case of errors, or whether we want a clean termination even if it takes a while. This routine is automatically always called just before a routine is popped off the target stack. Closing file descriptors and freeing memory are typical things it should do. */ /* Close out all files and local state before this target loses control. */ static void gdbsim_close (int quitting) { if (remote_debug) printf_filtered ("gdbsim_close: quitting %d\n", quitting); program_loaded = 0; if (gdbsim_desc != NULL) { sim_close (gdbsim_desc, quitting); gdbsim_desc = NULL; } end_callbacks (); generic_mourn_inferior (); } /* Takes a program previously attached to and detaches it. The program may resume execution (some targets do, some don't) and will no longer stop on signals, etc. We better not have left any breakpoints in the program or it'll die when it hits one. ARGS is arguments typed by the user (e.g. a signal to send the process). FROM_TTY says whether to be verbose or not. */ /* Terminate the open connection to the remote debugger. Use this when you want to detach and do something else with your gdb. */ static void gdbsim_detach (char *args, int from_tty) { if (remote_debug) printf_filtered ("gdbsim_detach: args \"%s\"\n", args); pop_target (); /* calls gdbsim_close to do the real work */ if (from_tty) printf_filtered ("Ending simulator %s debugging\n", target_shortname); } /* Resume execution of the target process. STEP says whether to single-step or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given to the target, or zero for no signal. */ static enum target_signal resume_siggnal; static int resume_step; static void gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal) { if (PIDGET (inferior_ptid) != 42) error (_("The program is not being run.")); if (remote_debug) printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal); resume_siggnal = siggnal; resume_step = step; } /* Notify the simulator of an asynchronous request to stop. The simulator shall ensure that the stop request is eventually delivered to the simulator. If the call is made while the simulator is not running then the stop request is processed when the simulator is next resumed. For simulators that do not support this operation, just abort */ static void gdbsim_stop (void) { if (!sim_stop (gdbsim_desc)) { quit (); } } /* GDB version of os_poll_quit callback. Taken from gdb/util.c - should be in a library. */ static int gdb_os_poll_quit (host_callback *p) { if (deprecated_ui_loop_hook != NULL) deprecated_ui_loop_hook (0); if (quit_flag) /* gdb's idea of quit */ { quit_flag = 0; /* we've stolen it */ return 1; } else if (immediate_quit) { return 1; } return 0; } /* Wait for inferior process to do something. Return pid of child, or -1 in case of error; store status through argument pointer STATUS, just as `wait' would. */ static void gdbsim_cntrl_c (int signo) { gdbsim_stop (); } static ptid_t gdbsim_wait (ptid_t ptid, struct target_waitstatus *status) { static RETSIGTYPE (*prev_sigint) (); int sigrc = 0; enum sim_stop reason = sim_running; if (remote_debug) printf_filtered ("gdbsim_wait\n"); #if defined (HAVE_SIGACTION) && defined (SA_RESTART) { struct sigaction sa, osa; sa.sa_handler = gdbsim_cntrl_c; sigemptyset (&sa.sa_mask); sa.sa_flags = 0; sigaction (SIGINT, &sa, &osa); prev_sigint = osa.sa_handler; } #else prev_sigint = signal (SIGINT, gdbsim_cntrl_c); #endif sim_resume (gdbsim_desc, resume_step, resume_siggnal); signal (SIGINT, prev_sigint); resume_step = 0; sim_stop_reason (gdbsim_desc, &reason, &sigrc); switch (reason) { case sim_exited: status->kind = TARGET_WAITKIND_EXITED; status->value.integer = sigrc; break; case sim_stopped: switch (sigrc) { case TARGET_SIGNAL_ABRT: quit (); break; case TARGET_SIGNAL_INT: case TARGET_SIGNAL_TRAP: default: status->kind = TARGET_WAITKIND_STOPPED; status->value.sig = sigrc; break; } break; case sim_signalled: status->kind = TARGET_WAITKIND_SIGNALLED; status->value.sig = sigrc; break; case sim_running: case sim_polling: /* FIXME: Is this correct? */ break; } return inferior_ptid; } /* Get ready to modify the registers array. On machines which store individual registers, this doesn't need to do anything. On machines which store all the registers in one fell swoop, this makes sure that registers contains all the registers from the program being debugged. */ static void gdbsim_prepare_to_store (struct regcache *regcache) { /* Do nothing, since we can store individual regs */ } /* Transfer LEN bytes between GDB address MYADDR and target address MEMADDR. If WRITE is non-zero, transfer them to the target, otherwise transfer them from the target. TARGET is unused. Returns the number of bytes transferred. */ static int gdbsim_xfer_inferior_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, struct mem_attrib *attrib, struct target_ops *target) { /* If no program is running yet, then ignore the simulator for memory. Pass the request down to the next target, hopefully an exec file. */ if (!target_has_execution) return 0; if (!program_loaded) error (_("No program loaded.")); if (remote_debug) { /* FIXME: Send to something other than STDOUT? */ printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x"); gdb_print_host_address (myaddr, gdb_stdout); printf_filtered (", memaddr 0x%s, len %d, write %d\n", paddr_nz (memaddr), len, write); if (remote_debug && write) dump_mem (myaddr, len); } if (write) { len = sim_write (gdbsim_desc, memaddr, myaddr, len); } else { len = sim_read (gdbsim_desc, memaddr, myaddr, len); if (remote_debug && len > 0) dump_mem (myaddr, len); } return len; } static void gdbsim_files_info (struct target_ops *target) { char *file = "nothing"; if (exec_bfd) file = bfd_get_filename (exec_bfd); if (remote_debug) printf_filtered ("gdbsim_files_info: file \"%s\"\n", file); if (exec_bfd) { printf_filtered ("\tAttached to %s running program %s\n", target_shortname, file); sim_info (gdbsim_desc, 0); } } /* Clear the simulator's notion of what the break points are. */ static void gdbsim_mourn_inferior (void) { if (remote_debug) printf_filtered ("gdbsim_mourn_inferior:\n"); remove_breakpoints (); target_mark_exited (&gdbsim_ops); generic_mourn_inferior (); } /* Pass the command argument through to the simulator verbatim. The simulator must do any command interpretation work. */ void simulator_command (char *args, int from_tty) { if (gdbsim_desc == NULL) { /* PREVIOUSLY: The user may give a command before the simulator is opened. [...] (??? assuming of course one wishes to continue to allow commands to be sent to unopened simulators, which isn't entirely unreasonable). */ /* The simulator is a builtin abstraction of a remote target. Consistent with that model, access to the simulator, via sim commands, is restricted to the period when the channel to the simulator is open. */ error (_("Not connected to the simulator target")); } sim_do_command (gdbsim_desc, args); /* Invalidate the register cache, in case the simulator command does something funny. */ registers_changed (); } /* Define the target subroutine names */ struct target_ops gdbsim_ops; static void init_gdbsim_ops (void) { gdbsim_ops.to_shortname = "sim"; gdbsim_ops.to_longname = "simulator"; gdbsim_ops.to_doc = "Use the compiled-in simulator."; gdbsim_ops.to_open = gdbsim_open; gdbsim_ops.to_close = gdbsim_close; gdbsim_ops.to_detach = gdbsim_detach; gdbsim_ops.to_resume = gdbsim_resume; gdbsim_ops.to_wait = gdbsim_wait; gdbsim_ops.to_fetch_registers = gdbsim_fetch_register; gdbsim_ops.to_store_registers = gdbsim_store_register; gdbsim_ops.to_prepare_to_store = gdbsim_prepare_to_store; gdbsim_ops.deprecated_xfer_memory = gdbsim_xfer_inferior_memory; gdbsim_ops.to_files_info = gdbsim_files_info; gdbsim_ops.to_insert_breakpoint = memory_insert_breakpoint; gdbsim_ops.to_remove_breakpoint = memory_remove_breakpoint; gdbsim_ops.to_kill = gdbsim_kill; gdbsim_ops.to_load = gdbsim_load; gdbsim_ops.to_create_inferior = gdbsim_create_inferior; gdbsim_ops.to_mourn_inferior = gdbsim_mourn_inferior; gdbsim_ops.to_stop = gdbsim_stop; gdbsim_ops.to_stratum = process_stratum; gdbsim_ops.to_has_all_memory = 1; gdbsim_ops.to_has_memory = 1; gdbsim_ops.to_has_stack = 1; gdbsim_ops.to_has_registers = 1; gdbsim_ops.to_has_execution = 1; gdbsim_ops.to_magic = OPS_MAGIC; #ifdef TARGET_REDEFINE_DEFAULT_OPS TARGET_REDEFINE_DEFAULT_OPS (&gdbsim_ops); #endif } void _initialize_remote_sim (void) { init_gdbsim_ops (); add_target (&gdbsim_ops); add_com ("sim", class_obscure, simulator_command, _("Send a command to the simulator.")); }
Go to most recent revision | Compare with Previous | Blame | View Log