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[/] [openrisc/] [tags/] [gnu-src/] [gdb-6.8/] [pre-binutils-2.20.1-sync/] [gdb/] [gdbserver/] [server.c] - Rev 24
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/* Main code for remote server for GDB. Copyright (C) 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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/>. */ #include "server.h" #if HAVE_UNISTD_H #include <unistd.h> #endif #if HAVE_SIGNAL_H #include <signal.h> #endif #if HAVE_SYS_WAIT_H #include <sys/wait.h> #endif unsigned long cont_thread; unsigned long general_thread; unsigned long step_thread; unsigned long thread_from_wait; unsigned long old_thread_from_wait; int server_waiting; static int extended_protocol; static int attached; static int response_needed; static int exit_requested; static char **program_argv; /* Enable miscellaneous debugging output. The name is historical - it was originally used to debug LinuxThreads support. */ int debug_threads; int pass_signals[TARGET_SIGNAL_LAST]; jmp_buf toplevel; /* The PID of the originally created or attached inferior. Used to send signals to the process when GDB sends us an asynchronous interrupt (user hitting Control-C in the client), and to wait for the child to exit when no longer debugging it. */ unsigned long signal_pid; #ifdef SIGTTOU /* A file descriptor for the controlling terminal. */ int terminal_fd; /* TERMINAL_FD's original foreground group. */ pid_t old_foreground_pgrp; /* Hand back terminal ownership to the original foreground group. */ static void restore_old_foreground_pgrp (void) { tcsetpgrp (terminal_fd, old_foreground_pgrp); } #endif static int target_running (void) { return all_threads.head != NULL; } static int start_inferior (char *argv[], char *statusptr) { attached = 0; #ifdef SIGTTOU signal (SIGTTOU, SIG_DFL); signal (SIGTTIN, SIG_DFL); #endif signal_pid = create_inferior (argv[0], argv); /* FIXME: we don't actually know at this point that the create actually succeeded. We won't know that until we wait. */ fprintf (stderr, "Process %s created; pid = %ld\n", argv[0], signal_pid); fflush (stderr); #ifdef SIGTTOU signal (SIGTTOU, SIG_IGN); signal (SIGTTIN, SIG_IGN); terminal_fd = fileno (stderr); old_foreground_pgrp = tcgetpgrp (terminal_fd); tcsetpgrp (terminal_fd, signal_pid); atexit (restore_old_foreground_pgrp); #endif /* Wait till we are at 1st instruction in program, return signal number (assuming success). */ return mywait (statusptr, 0); } static int attach_inferior (int pid, char *statusptr, int *sigptr) { /* myattach should return -1 if attaching is unsupported, 0 if it succeeded, and call error() otherwise. */ if (myattach (pid) != 0) return -1; attached = 1; fprintf (stderr, "Attached; pid = %d\n", pid); fflush (stderr); /* FIXME - It may be that we should get the SIGNAL_PID from the attach function, so that it can be the main thread instead of whichever we were told to attach to. */ signal_pid = pid; *sigptr = mywait (statusptr, 0); /* GDB knows to ignore the first SIGSTOP after attaching to a running process using the "attach" command, but this is different; it's just using "target remote". Pretend it's just starting up. */ if (*statusptr == 'T' && *sigptr == TARGET_SIGNAL_STOP) *sigptr = TARGET_SIGNAL_TRAP; return 0; } extern int remote_debug; /* Decode a qXfer read request. Return 0 if everything looks OK, or -1 otherwise. */ static int decode_xfer_read (char *buf, char **annex, CORE_ADDR *ofs, unsigned int *len) { /* Extract and NUL-terminate the annex. */ *annex = buf; while (*buf && *buf != ':') buf++; if (*buf == '\0') return -1; *buf++ = 0; /* After the read marker and annex, qXfer looks like a traditional 'm' packet. */ decode_m_packet (buf, ofs, len); return 0; } /* Write the response to a successful qXfer read. Returns the length of the (binary) data stored in BUF, corresponding to as much of DATA/LEN as we could fit. IS_MORE controls the first character of the response. */ static int write_qxfer_response (char *buf, const void *data, int len, int is_more) { int out_len; if (is_more) buf[0] = 'm'; else buf[0] = 'l'; return remote_escape_output (data, len, (unsigned char *) buf + 1, &out_len, PBUFSIZ - 2) + 1; } /* Handle all of the extended 'Q' packets. */ void handle_general_set (char *own_buf) { if (strncmp ("QPassSignals:", own_buf, strlen ("QPassSignals:")) == 0) { int numsigs = (int) TARGET_SIGNAL_LAST, i; const char *p = own_buf + strlen ("QPassSignals:"); CORE_ADDR cursig; p = decode_address_to_semicolon (&cursig, p); for (i = 0; i < numsigs; i++) { if (i == cursig) { pass_signals[i] = 1; if (*p == '\0') /* Keep looping, to clear the remaining signals. */ cursig = -1; else p = decode_address_to_semicolon (&cursig, p); } else pass_signals[i] = 0; } strcpy (own_buf, "OK"); return; } /* Otherwise we didn't know what packet it was. Say we didn't understand it. */ own_buf[0] = 0; } static const char * get_features_xml (const char *annex) { static int features_supported = -1; static char *document; #ifdef USE_XML extern const char *const xml_builtin[][2]; int i; /* Look for the annex. */ for (i = 0; xml_builtin[i][0] != NULL; i++) if (strcmp (annex, xml_builtin[i][0]) == 0) break; if (xml_builtin[i][0] != NULL) return xml_builtin[i][1]; #endif if (strcmp (annex, "target.xml") != 0) return NULL; if (features_supported == -1) { const char *arch = NULL; if (the_target->arch_string != NULL) arch = (*the_target->arch_string) (); if (arch == NULL) features_supported = 0; else { features_supported = 1; document = malloc (64 + strlen (arch)); snprintf (document, 64 + strlen (arch), "<target><architecture>%s</architecture></target>", arch); } } return document; } void monitor_show_help (void) { monitor_output ("The following monitor commands are supported:\n"); monitor_output (" set debug <0|1>\n"); monitor_output (" Enable general debugging messages\n"); monitor_output (" set remote-debug <0|1>\n"); monitor_output (" Enable remote protocol debugging messages\n"); monitor_output (" exit\n"); monitor_output (" Quit GDBserver\n"); } #define require_running(BUF) \ if (!target_running ()) \ { \ write_enn (BUF); \ return; \ } /* Handle all of the extended 'q' packets. */ void handle_query (char *own_buf, int packet_len, int *new_packet_len_p) { static struct inferior_list_entry *thread_ptr; /* Reply the current thread id. */ if (strcmp ("qC", own_buf) == 0) { require_running (own_buf); thread_ptr = all_threads.head; sprintf (own_buf, "QC%x", thread_to_gdb_id ((struct thread_info *)thread_ptr)); return; } if (strcmp ("qSymbol::", own_buf) == 0) { if (target_running () && the_target->look_up_symbols != NULL) (*the_target->look_up_symbols) (); strcpy (own_buf, "OK"); return; } if (strcmp ("qfThreadInfo", own_buf) == 0) { require_running (own_buf); thread_ptr = all_threads.head; sprintf (own_buf, "m%x", thread_to_gdb_id ((struct thread_info *)thread_ptr)); thread_ptr = thread_ptr->next; return; } if (strcmp ("qsThreadInfo", own_buf) == 0) { require_running (own_buf); if (thread_ptr != NULL) { sprintf (own_buf, "m%x", thread_to_gdb_id ((struct thread_info *)thread_ptr)); thread_ptr = thread_ptr->next; return; } else { sprintf (own_buf, "l"); return; } } if (the_target->read_offsets != NULL && strcmp ("qOffsets", own_buf) == 0) { CORE_ADDR text, data; require_running (own_buf); if (the_target->read_offsets (&text, &data)) sprintf (own_buf, "Text=%lX;Data=%lX;Bss=%lX", (long)text, (long)data, (long)data); else write_enn (own_buf); return; } if (the_target->qxfer_spu != NULL && strncmp ("qXfer:spu:read:", own_buf, 15) == 0) { char *annex; int n; unsigned int len; CORE_ADDR ofs; unsigned char *spu_buf; require_running (own_buf); strcpy (own_buf, "E00"); if (decode_xfer_read (own_buf + 15, &annex, &ofs, &len) < 0) return; if (len > PBUFSIZ - 2) len = PBUFSIZ - 2; spu_buf = malloc (len + 1); if (!spu_buf) return; n = (*the_target->qxfer_spu) (annex, spu_buf, NULL, ofs, len + 1); if (n < 0) write_enn (own_buf); else if (n > len) *new_packet_len_p = write_qxfer_response (own_buf, spu_buf, len, 1); else *new_packet_len_p = write_qxfer_response (own_buf, spu_buf, n, 0); free (spu_buf); return; } if (the_target->qxfer_spu != NULL && strncmp ("qXfer:spu:write:", own_buf, 16) == 0) { char *annex; int n; unsigned int len; CORE_ADDR ofs; unsigned char *spu_buf; require_running (own_buf); strcpy (own_buf, "E00"); spu_buf = malloc (packet_len - 15); if (!spu_buf) return; if (decode_xfer_write (own_buf + 16, packet_len - 16, &annex, &ofs, &len, spu_buf) < 0) { free (spu_buf); return; } n = (*the_target->qxfer_spu) (annex, NULL, (unsigned const char *)spu_buf, ofs, len); if (n < 0) write_enn (own_buf); else sprintf (own_buf, "%x", n); free (spu_buf); return; } if (the_target->read_auxv != NULL && strncmp ("qXfer:auxv:read:", own_buf, 16) == 0) { unsigned char *data; int n; CORE_ADDR ofs; unsigned int len; char *annex; require_running (own_buf); /* Reject any annex; grab the offset and length. */ if (decode_xfer_read (own_buf + 16, &annex, &ofs, &len) < 0 || annex[0] != '\0') { strcpy (own_buf, "E00"); return; } /* Read one extra byte, as an indicator of whether there is more. */ if (len > PBUFSIZ - 2) len = PBUFSIZ - 2; data = malloc (len + 1); n = (*the_target->read_auxv) (ofs, data, len + 1); if (n < 0) write_enn (own_buf); else if (n > len) *new_packet_len_p = write_qxfer_response (own_buf, data, len, 1); else *new_packet_len_p = write_qxfer_response (own_buf, data, n, 0); free (data); return; } if (strncmp ("qXfer:features:read:", own_buf, 20) == 0) { CORE_ADDR ofs; unsigned int len, total_len; const char *document; char *annex; require_running (own_buf); /* Check for support. */ document = get_features_xml ("target.xml"); if (document == NULL) { own_buf[0] = '\0'; return; } /* Grab the annex, offset, and length. */ if (decode_xfer_read (own_buf + 20, &annex, &ofs, &len) < 0) { strcpy (own_buf, "E00"); return; } /* Now grab the correct annex. */ document = get_features_xml (annex); if (document == NULL) { strcpy (own_buf, "E00"); return; } total_len = strlen (document); if (len > PBUFSIZ - 2) len = PBUFSIZ - 2; if (ofs > total_len) write_enn (own_buf); else if (len < total_len - ofs) *new_packet_len_p = write_qxfer_response (own_buf, document + ofs, len, 1); else *new_packet_len_p = write_qxfer_response (own_buf, document + ofs, total_len - ofs, 0); return; } if (strncmp ("qXfer:libraries:read:", own_buf, 21) == 0) { CORE_ADDR ofs; unsigned int len, total_len; char *document, *p; struct inferior_list_entry *dll_ptr; char *annex; require_running (own_buf); /* Reject any annex; grab the offset and length. */ if (decode_xfer_read (own_buf + 21, &annex, &ofs, &len) < 0 || annex[0] != '\0') { strcpy (own_buf, "E00"); return; } /* Over-estimate the necessary memory. Assume that every character in the library name must be escaped. */ total_len = 64; for (dll_ptr = all_dlls.head; dll_ptr != NULL; dll_ptr = dll_ptr->next) total_len += 128 + 6 * strlen (((struct dll_info *) dll_ptr)->name); document = malloc (total_len); strcpy (document, "<library-list>\n"); p = document + strlen (document); for (dll_ptr = all_dlls.head; dll_ptr != NULL; dll_ptr = dll_ptr->next) { struct dll_info *dll = (struct dll_info *) dll_ptr; char *name; strcpy (p, " <library name=\""); p = p + strlen (p); name = xml_escape_text (dll->name); strcpy (p, name); free (name); p = p + strlen (p); strcpy (p, "\"><segment address=\""); p = p + strlen (p); sprintf (p, "0x%lx", (long) dll->base_addr); p = p + strlen (p); strcpy (p, "\"/></library>\n"); p = p + strlen (p); } strcpy (p, "</library-list>\n"); total_len = strlen (document); if (len > PBUFSIZ - 2) len = PBUFSIZ - 2; if (ofs > total_len) write_enn (own_buf); else if (len < total_len - ofs) *new_packet_len_p = write_qxfer_response (own_buf, document + ofs, len, 1); else *new_packet_len_p = write_qxfer_response (own_buf, document + ofs, total_len - ofs, 0); free (document); return; } /* Protocol features query. */ if (strncmp ("qSupported", own_buf, 10) == 0 && (own_buf[10] == ':' || own_buf[10] == '\0')) { sprintf (own_buf, "PacketSize=%x;QPassSignals+", PBUFSIZ - 1); /* We do not have any hook to indicate whether the target backend supports qXfer:libraries:read, so always report it. */ strcat (own_buf, ";qXfer:libraries:read+"); if (the_target->read_auxv != NULL) strcat (own_buf, ";qXfer:auxv:read+"); if (the_target->qxfer_spu != NULL) strcat (own_buf, ";qXfer:spu:read+;qXfer:spu:write+"); if (get_features_xml ("target.xml") != NULL) strcat (own_buf, ";qXfer:features:read+"); return; } /* Thread-local storage support. */ if (the_target->get_tls_address != NULL && strncmp ("qGetTLSAddr:", own_buf, 12) == 0) { char *p = own_buf + 12; CORE_ADDR parts[3], address = 0; int i, err; require_running (own_buf); for (i = 0; i < 3; i++) { char *p2; int len; if (p == NULL) break; p2 = strchr (p, ','); if (p2) { len = p2 - p; p2++; } else { len = strlen (p); p2 = NULL; } decode_address (&parts[i], p, len); p = p2; } if (p != NULL || i < 3) err = 1; else { struct thread_info *thread = gdb_id_to_thread (parts[0]); if (thread == NULL) err = 2; else err = the_target->get_tls_address (thread, parts[1], parts[2], &address); } if (err == 0) { sprintf (own_buf, "%llx", address); return; } else if (err > 0) { write_enn (own_buf); return; } /* Otherwise, pretend we do not understand this packet. */ } /* Handle "monitor" commands. */ if (strncmp ("qRcmd,", own_buf, 6) == 0) { char *mon = malloc (PBUFSIZ); int len = strlen (own_buf + 6); if ((len % 2) != 0 || unhexify (mon, own_buf + 6, len / 2) != len / 2) { write_enn (own_buf); free (mon); return; } mon[len / 2] = '\0'; write_ok (own_buf); if (strcmp (mon, "set debug 1") == 0) { debug_threads = 1; monitor_output ("Debug output enabled.\n"); } else if (strcmp (mon, "set debug 0") == 0) { debug_threads = 0; monitor_output ("Debug output disabled.\n"); } else if (strcmp (mon, "set remote-debug 1") == 0) { remote_debug = 1; monitor_output ("Protocol debug output enabled.\n"); } else if (strcmp (mon, "set remote-debug 0") == 0) { remote_debug = 0; monitor_output ("Protocol debug output disabled.\n"); } else if (strcmp (mon, "help") == 0) monitor_show_help (); else if (strcmp (mon, "exit") == 0) exit_requested = 1; else { monitor_output ("Unknown monitor command.\n\n"); monitor_show_help (); write_enn (own_buf); } free (mon); return; } /* Otherwise we didn't know what packet it was. Say we didn't understand it. */ own_buf[0] = 0; } /* Parse vCont packets. */ void handle_v_cont (char *own_buf, char *status, int *signal) { char *p, *q; int n = 0, i = 0; struct thread_resume *resume_info, default_action; /* Count the number of semicolons in the packet. There should be one for every action. */ p = &own_buf[5]; while (p) { n++; p++; p = strchr (p, ';'); } /* Allocate room for one extra action, for the default remain-stopped behavior; if no default action is in the list, we'll need the extra slot. */ resume_info = malloc ((n + 1) * sizeof (resume_info[0])); default_action.thread = -1; default_action.leave_stopped = 1; default_action.step = 0; default_action.sig = 0; p = &own_buf[5]; i = 0; while (*p) { p++; resume_info[i].leave_stopped = 0; if (p[0] == 's' || p[0] == 'S') resume_info[i].step = 1; else if (p[0] == 'c' || p[0] == 'C') resume_info[i].step = 0; else goto err; if (p[0] == 'S' || p[0] == 'C') { int sig; sig = strtol (p + 1, &q, 16); if (p == q) goto err; p = q; if (!target_signal_to_host_p (sig)) goto err; resume_info[i].sig = target_signal_to_host (sig); } else { resume_info[i].sig = 0; p = p + 1; } if (p[0] == 0) { resume_info[i].thread = -1; default_action = resume_info[i]; /* Note: we don't increment i here, we'll overwrite this entry the next time through. */ } else if (p[0] == ':') { unsigned int gdb_id = strtoul (p + 1, &q, 16); unsigned long thread_id; if (p == q) goto err; p = q; if (p[0] != ';' && p[0] != 0) goto err; thread_id = gdb_id_to_thread_id (gdb_id); if (thread_id) resume_info[i].thread = thread_id; else goto err; i++; } } resume_info[i] = default_action; /* Still used in occasional places in the backend. */ if (n == 1 && resume_info[0].thread != -1) cont_thread = resume_info[0].thread; else cont_thread = -1; set_desired_inferior (0); enable_async_io (); (*the_target->resume) (resume_info); free (resume_info); *signal = mywait (status, 1); prepare_resume_reply (own_buf, *status, *signal); disable_async_io (); return; err: write_enn (own_buf); free (resume_info); return; } /* Attach to a new program. Return 1 if successful, 0 if failure. */ int handle_v_attach (char *own_buf, char *status, int *signal) { int pid; pid = strtol (own_buf + 8, NULL, 16); if (pid != 0 && attach_inferior (pid, status, signal) == 0) { prepare_resume_reply (own_buf, *status, *signal); return 1; } else { write_enn (own_buf); return 0; } } /* Run a new program. Return 1 if successful, 0 if failure. */ static int handle_v_run (char *own_buf, char *status, int *signal) { char *p, **pp, *next_p, **new_argv; int i, new_argc; new_argc = 0; for (p = own_buf + strlen ("vRun;"); p && *p; p = strchr (p, ';')) { p++; new_argc++; } new_argv = malloc ((new_argc + 2) * sizeof (char *)); i = 0; for (p = own_buf + strlen ("vRun;"); *p; p = next_p) { next_p = strchr (p, ';'); if (next_p == NULL) next_p = p + strlen (p); if (i == 0 && p == next_p) new_argv[i] = NULL; else { new_argv[i] = malloc (1 + (next_p - p) / 2); unhexify (new_argv[i], p, (next_p - p) / 2); new_argv[i][(next_p - p) / 2] = '\0'; } if (*next_p) next_p++; i++; } new_argv[i] = NULL; if (new_argv[0] == NULL) { if (program_argv == NULL) { write_enn (own_buf); return 0; } new_argv[0] = strdup (program_argv[0]); } /* Free the old argv. */ if (program_argv) { for (pp = program_argv; *pp != NULL; pp++) free (*pp); free (program_argv); } program_argv = new_argv; *signal = start_inferior (program_argv, status); if (*status == 'T') { prepare_resume_reply (own_buf, *status, *signal); return 1; } else { write_enn (own_buf); return 0; } } /* Handle all of the extended 'v' packets. */ void handle_v_requests (char *own_buf, char *status, int *signal, int packet_len, int *new_packet_len) { if (strncmp (own_buf, "vCont;", 6) == 0) { require_running (own_buf); handle_v_cont (own_buf, status, signal); return; } if (strncmp (own_buf, "vCont?", 6) == 0) { strcpy (own_buf, "vCont;c;C;s;S"); return; } if (strncmp (own_buf, "vFile:", 6) == 0 && handle_vFile (own_buf, packet_len, new_packet_len)) return; if (strncmp (own_buf, "vAttach;", 8) == 0) { if (target_running ()) { fprintf (stderr, "Already debugging a process\n"); write_enn (own_buf); return; } handle_v_attach (own_buf, status, signal); return; } if (strncmp (own_buf, "vRun;", 5) == 0) { if (target_running ()) { fprintf (stderr, "Already debugging a process\n"); write_enn (own_buf); return; } handle_v_run (own_buf, status, signal); return; } /* Otherwise we didn't know what packet it was. Say we didn't understand it. */ own_buf[0] = 0; return; } void myresume (char *own_buf, int step, int *signalp, char *statusp) { struct thread_resume resume_info[2]; int n = 0; int sig = *signalp; set_desired_inferior (0); if (step || sig || (cont_thread != 0 && cont_thread != -1)) { resume_info[0].thread = ((struct inferior_list_entry *) current_inferior)->id; resume_info[0].step = step; resume_info[0].sig = sig; resume_info[0].leave_stopped = 0; n++; } resume_info[n].thread = -1; resume_info[n].step = 0; resume_info[n].sig = 0; resume_info[n].leave_stopped = (cont_thread != 0 && cont_thread != -1); enable_async_io (); (*the_target->resume) (resume_info); *signalp = mywait (statusp, 1); prepare_resume_reply (own_buf, *statusp, *signalp); disable_async_io (); } static void gdbserver_version (void) { printf ("GNU gdbserver %s\n" "Copyright (C) 2007 Free Software Foundation, Inc.\n" "gdbserver is free software, covered by the GNU General Public License.\n" "This gdbserver was configured as \"%s\"\n", version, host_name); } static void gdbserver_usage (void) { printf ("Usage:\tgdbserver [OPTIONS] COMM PROG [ARGS ...]\n" "\tgdbserver [OPTIONS] --attach COMM PID\n" "\tgdbserver [OPTIONS] --multi COMM\n" "\n" "COMM may either be a tty device (for serial debugging), or \n" "HOST:PORT to listen for a TCP connection.\n" "\n" "Options:\n" " --debug\t\tEnable debugging output.\n"); } #undef require_running #define require_running(BUF) \ if (!target_running ()) \ { \ write_enn (BUF); \ break; \ } int main (int argc, char *argv[]) { char ch, status, *own_buf; unsigned char *mem_buf; int i = 0; int signal; unsigned int len; CORE_ADDR mem_addr; int bad_attach; int pid; char *arg_end, *port; char **next_arg = &argv[1]; int multi_mode = 0; int attach = 0; int was_running; while (*next_arg != NULL && **next_arg == '-') { if (strcmp (*next_arg, "--version") == 0) { gdbserver_version (); exit (0); } else if (strcmp (*next_arg, "--help") == 0) { gdbserver_usage (); exit (0); } else if (strcmp (*next_arg, "--attach") == 0) attach = 1; else if (strcmp (*next_arg, "--multi") == 0) multi_mode = 1; else if (strcmp (*next_arg, "--debug") == 0) debug_threads = 1; else { fprintf (stderr, "Unknown argument: %s\n", *next_arg); exit (1); } next_arg++; continue; } if (setjmp (toplevel)) { fprintf (stderr, "Exiting\n"); exit (1); } port = *next_arg; next_arg++; if (port == NULL || (!attach && !multi_mode && *next_arg == NULL)) { gdbserver_usage (); exit (1); } bad_attach = 0; pid = 0; /* --attach used to come after PORT, so allow it there for compatibility. */ if (*next_arg != NULL && strcmp (*next_arg, "--attach") == 0) { attach = 1; next_arg++; } if (attach && (*next_arg == NULL || (*next_arg)[0] == '\0' || (pid = strtoul (*next_arg, &arg_end, 0)) == 0 || *arg_end != '\0' || next_arg[1] != NULL)) bad_attach = 1; if (bad_attach) { gdbserver_usage (); exit (1); } initialize_async_io (); initialize_low (); own_buf = malloc (PBUFSIZ + 1); mem_buf = malloc (PBUFSIZ); if (pid == 0 && *next_arg != NULL) { int i, n; n = argc - (next_arg - argv); program_argv = malloc (sizeof (char *) * (n + 1)); for (i = 0; i < n; i++) program_argv[i] = strdup (next_arg[i]); program_argv[i] = NULL; /* Wait till we are at first instruction in program. */ signal = start_inferior (program_argv, &status); /* We are now (hopefully) stopped at the first instruction of the target process. This assumes that the target process was successfully created. */ } else if (pid != 0) { if (attach_inferior (pid, &status, &signal) == -1) error ("Attaching not supported on this target"); /* Otherwise succeeded. */ } else { status = 'W'; signal = 0; } /* Don't report shared library events on the initial connection, even if some libraries are preloaded. Avoids the "stopped by shared library event" notice on gdb side. */ dlls_changed = 0; if (setjmp (toplevel)) { fprintf (stderr, "Killing inferior\n"); kill_inferior (); exit (1); } if (status == 'W' || status == 'X') was_running = 0; else was_running = 1; if (!was_running && !multi_mode) { fprintf (stderr, "No program to debug. GDBserver exiting.\n"); exit (1); } while (1) { remote_open (port); restart: if (setjmp (toplevel) != 0) { /* An error occurred. */ if (response_needed) { write_enn (own_buf); putpkt (own_buf); } } disable_async_io (); while (!exit_requested) { unsigned char sig; int packet_len; int new_packet_len = -1; response_needed = 0; packet_len = getpkt (own_buf); if (packet_len <= 0) break; response_needed = 1; i = 0; ch = own_buf[i++]; switch (ch) { case 'q': handle_query (own_buf, packet_len, &new_packet_len); break; case 'Q': handle_general_set (own_buf); break; case 'D': require_running (own_buf); fprintf (stderr, "Detaching from inferior\n"); if (detach_inferior () != 0) write_enn (own_buf); else { write_ok (own_buf); if (extended_protocol) { /* Treat this like a normal program exit. */ signal = 0; status = 'W'; } else { putpkt (own_buf); remote_close (); /* If we are attached, then we can exit. Otherwise, we need to hang around doing nothing, until the child is gone. */ if (!attached) join_inferior (); exit (0); } } break; case '!': extended_protocol = 1; write_ok (own_buf); break; case '?': prepare_resume_reply (own_buf, status, signal); break; case 'H': if (own_buf[1] == 'c' || own_buf[1] == 'g' || own_buf[1] == 's') { unsigned long gdb_id, thread_id; require_running (own_buf); gdb_id = strtoul (&own_buf[2], NULL, 16); if (gdb_id == 0 || gdb_id == -1) thread_id = gdb_id; else { thread_id = gdb_id_to_thread_id (gdb_id); if (thread_id == 0) { write_enn (own_buf); break; } } if (own_buf[1] == 'g') { general_thread = thread_id; set_desired_inferior (1); } else if (own_buf[1] == 'c') cont_thread = thread_id; else if (own_buf[1] == 's') step_thread = thread_id; write_ok (own_buf); } else { /* Silently ignore it so that gdb can extend the protocol without compatibility headaches. */ own_buf[0] = '\0'; } break; case 'g': require_running (own_buf); set_desired_inferior (1); registers_to_string (own_buf); break; case 'G': require_running (own_buf); set_desired_inferior (1); registers_from_string (&own_buf[1]); write_ok (own_buf); break; case 'm': require_running (own_buf); decode_m_packet (&own_buf[1], &mem_addr, &len); if (read_inferior_memory (mem_addr, mem_buf, len) == 0) convert_int_to_ascii (mem_buf, own_buf, len); else write_enn (own_buf); break; case 'M': require_running (own_buf); decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf); if (write_inferior_memory (mem_addr, mem_buf, len) == 0) write_ok (own_buf); else write_enn (own_buf); break; case 'X': require_running (own_buf); if (decode_X_packet (&own_buf[1], packet_len - 1, &mem_addr, &len, mem_buf) < 0 || write_inferior_memory (mem_addr, mem_buf, len) != 0) write_enn (own_buf); else write_ok (own_buf); break; case 'C': require_running (own_buf); convert_ascii_to_int (own_buf + 1, &sig, 1); if (target_signal_to_host_p (sig)) signal = target_signal_to_host (sig); else signal = 0; myresume (own_buf, 0, &signal, &status); break; case 'S': require_running (own_buf); convert_ascii_to_int (own_buf + 1, &sig, 1); if (target_signal_to_host_p (sig)) signal = target_signal_to_host (sig); else signal = 0; myresume (own_buf, 1, &signal, &status); break; case 'c': require_running (own_buf); signal = 0; myresume (own_buf, 0, &signal, &status); break; case 's': require_running (own_buf); signal = 0; myresume (own_buf, 1, &signal, &status); break; case 'Z': { char *lenptr; char *dataptr; CORE_ADDR addr = strtoul (&own_buf[3], &lenptr, 16); int len = strtol (lenptr + 1, &dataptr, 16); char type = own_buf[1]; if (the_target->insert_watchpoint == NULL || (type < '2' || type > '4')) { /* No watchpoint support or not a watchpoint command; unrecognized either way. */ own_buf[0] = '\0'; } else { int res; require_running (own_buf); res = (*the_target->insert_watchpoint) (type, addr, len); if (res == 0) write_ok (own_buf); else if (res == 1) /* Unsupported. */ own_buf[0] = '\0'; else write_enn (own_buf); } break; } case 'z': { char *lenptr; char *dataptr; CORE_ADDR addr = strtoul (&own_buf[3], &lenptr, 16); int len = strtol (lenptr + 1, &dataptr, 16); char type = own_buf[1]; if (the_target->remove_watchpoint == NULL || (type < '2' || type > '4')) { /* No watchpoint support or not a watchpoint command; unrecognized either way. */ own_buf[0] = '\0'; } else { int res; require_running (own_buf); res = (*the_target->remove_watchpoint) (type, addr, len); if (res == 0) write_ok (own_buf); else if (res == 1) /* Unsupported. */ own_buf[0] = '\0'; else write_enn (own_buf); } break; } case 'k': response_needed = 0; if (!target_running ()) /* The packet we received doesn't make sense - but we can't reply to it, either. */ goto restart; fprintf (stderr, "Killing inferior\n"); kill_inferior (); /* When using the extended protocol, we wait with no program running. The traditional protocol will exit instead. */ if (extended_protocol) { status = 'X'; signal = TARGET_SIGNAL_KILL; was_running = 0; goto restart; } else { exit (0); break; } case 'T': { unsigned long gdb_id, thread_id; require_running (own_buf); gdb_id = strtoul (&own_buf[1], NULL, 16); thread_id = gdb_id_to_thread_id (gdb_id); if (thread_id == 0) { write_enn (own_buf); break; } if (mythread_alive (thread_id)) write_ok (own_buf); else write_enn (own_buf); } break; case 'R': response_needed = 0; /* Restarting the inferior is only supported in the extended protocol. */ if (extended_protocol) { if (target_running ()) kill_inferior (); fprintf (stderr, "GDBserver restarting\n"); /* Wait till we are at 1st instruction in prog. */ if (program_argv != NULL) signal = start_inferior (program_argv, &status); else { status = 'X'; signal = TARGET_SIGNAL_KILL; } goto restart; } else { /* It is a request we don't understand. Respond with an empty packet so that gdb knows that we don't support this request. */ own_buf[0] = '\0'; break; } case 'v': /* Extended (long) request. */ handle_v_requests (own_buf, &status, &signal, packet_len, &new_packet_len); break; default: /* It is a request we don't understand. Respond with an empty packet so that gdb knows that we don't support this request. */ own_buf[0] = '\0'; break; } if (new_packet_len != -1) putpkt_binary (own_buf, new_packet_len); else putpkt (own_buf); response_needed = 0; if (was_running && (status == 'W' || status == 'X')) { was_running = 0; if (status == 'W') fprintf (stderr, "\nChild exited with status %d\n", signal); if (status == 'X') fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", target_signal_to_host (signal), target_signal_to_name (signal)); if (extended_protocol) goto restart; else { fprintf (stderr, "GDBserver exiting\n"); exit (0); } } if (status != 'W' && status != 'X') was_running = 1; } /* If an exit was requested (using the "monitor exit" command), terminate now. The only other way to get here is for getpkt to fail; close the connection and reopen it at the top of the loop. */ if (exit_requested) { remote_close (); if (attached && target_running ()) detach_inferior (); else if (target_running ()) kill_inferior (); exit (0); } else { fprintf (stderr, "Remote side has terminated connection. " "GDBserver will reopen the connection.\n"); remote_close (); } } }
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