gdb/gdbserver/target.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Target operations for the remote server for GDB.
  2.    Copyright (C) 2002-2015 Free Software Foundation, Inc.

  4.    Contributed by MontaVista Software.

  6.    This file is part of GDB.

  8.    This program is free software; you can redistribute it and/or modify
  9.    it under the terms of the GNU General Public License as published by
  10.    the Free Software Foundation; either version 3 of the License, or
  11.    (at your option) any later version.

  13.    This program is distributed in the hope that it will be useful,
  14.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16.    GNU General Public License for more details.

  18.    You should have received a copy of the GNU General Public License
  19.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  21. #include "server.h"
  22. #include "tracepoint.h"

  24. ‌struct target_ops *the_target;

  26. void
  27. ‌set_desired_thread (int use_general)
  28. {
  29.   struct thread_info *found;

  31.   if (use_general == 1)
  32.     found = find_thread_ptid (general_thread);
  33.   else
  34.     found = find_thread_ptid (cont_thread);

  36.   if (found == NULL)
  37.     current_thread = get_first_thread ();
  38.   else
  39.     current_thread = found;
  40. }

  42. int
  43. ‌read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  44. {
  45.   int res;
  46.   res = (*the_target->read_memory) (memaddr, myaddr, len);
  47.   check_mem_read (memaddr, myaddr, len);
  48.   return res;
  49. }

  51. /* See target/target.h.  */

  53. int
  54. ‌target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
  55. {
  56.   return read_inferior_memory (memaddr, myaddr, len);
  57. }

  59. /* See target/target.h.  */

  61. int
  62. ‌target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
  63. {
  64.   return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
  65. }

  67. int
  68. ‌write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  69.                        int len)
  70. {
  71.   /* Lacking cleanups, there is some potential for a memory leak if the
  72.      write fails and we go through error().  Make sure that no more than
  73.      one buffer is ever pending by making BUFFER static.  */
  74.   static unsigned char *buffer = 0;
  75.   int res;

  77.   if (buffer != NULL)
  78.     free (buffer);

  80.   buffer = xmalloc (len);
  81.   memcpy (buffer, myaddr, len);
  82.   check_mem_write (memaddr, buffer, myaddr, len);
  83.   res = (*the_target->write_memory) (memaddr, buffer, len);
  84.   free (buffer);
  85.   buffer = NULL;

  87.   return res;
  88. }

  90. /* See target/target.h.  */

  92. int
  93. ‌target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
  94. {
  95.   return write_inferior_memory (memaddr, myaddr, len);
  96. }

  98. ptid_t
  99. ‌mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
  100.         int connected_wait)
  101. {
  102.   ptid_t ret;

  104.   if (connected_wait)
  105.     server_waiting = 1;

  107.   ret = (*the_target->wait) (ptid, ourstatus, options);

  109.   /* We don't expose _LOADED events to gdbserver core.  See the
  110.      `dlls_changed' global.  */
  111.   if (ourstatus->kind == TARGET_WAITKIND_LOADED)
  112.     ourstatus->kind = TARGET_WAITKIND_STOPPED;

  114.   /* If GDB is connected through TCP/serial, then GDBserver will most
  115.      probably be running on its own terminal/console, so it's nice to
  116.      print there why is GDBserver exiting.  If however, GDB is
  117.      connected through stdio, then there's no need to spam the GDB
  118.      console with this -- the user will already see the exit through
  119.      regular GDB output, in that same terminal.  */
  120.   if (!remote_connection_is_stdio ())
  121.     {
  122.       if (ourstatus->kind == TARGET_WAITKIND_EXITED)
  123.         fprintf (stderr,
  124.                  "\nChild exited with status %d\n", ourstatus->value.integer);
  125.       else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
  126.         fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
  127.                  gdb_signal_to_host (ourstatus->value.sig),
  128.                  gdb_signal_to_name (ourstatus->value.sig));
  129.     }

  131.   if (connected_wait)
  132.     server_waiting = 0;

  134.   return ret;
  135. }

  137. /* See target/target.h.  */

  139. void
  140. ‌target_stop_and_wait (ptid_t ptid)
  141. {
  142.   struct target_waitstatus status;
  143.   int was_non_stop = non_stop;
  144.   struct thread_resume resume_info;

  146.   resume_info.thread = ptid;
  147.   resume_info.kind = resume_stop;
  148.   resume_info.sig = GDB_SIGNAL_0;
  149.   (*the_target->resume) (&resume_info, 1);

  151.   non_stop = 1;
  152.   mywait (ptid, &status, 0, 0);
  153.   non_stop = was_non_stop;
  154. }

  156. /* See target/target.h.  */

  158. void
  159. ‌target_continue_no_signal (ptid_t ptid)
  160. {
  161.   struct thread_resume resume_info;

  163.   resume_info.thread = ptid;
  164.   resume_info.kind = resume_continue;
  165.   resume_info.sig = GDB_SIGNAL_0;
  166.   (*the_target->resume) (&resume_info, 1);
  167. }

  169. int
  170. ‌start_non_stop (int nonstop)
  171. {
  172.   if (the_target->start_non_stop == NULL)
  173.     {
  174.       if (nonstop)
  175.         return -1;
  176.       else
  177.         return 0;
  178.     }

  180.   return (*the_target->start_non_stop) (nonstop);
  181. }

  183. void
  184. ‌set_target_ops (struct target_ops *target)
  185. {
  186.   the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
  187.   memcpy (the_target, target, sizeof (*the_target));
  188. }

  190. /* Convert pid to printable format.  */

  192. const char *
  193. ‌target_pid_to_str (ptid_t ptid)
  194. {
  195.   static char buf[80];

  197.   if (ptid_equal (ptid, minus_one_ptid))
  198.     xsnprintf (buf, sizeof (buf), "<all threads>");
  199.   else if (ptid_equal (ptid, null_ptid))
  200.     xsnprintf (buf, sizeof (buf), "<null thread>");
  201.   else if (ptid_get_tid (ptid) != 0)
  202.     xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
  203.                ptid_get_pid (ptid), ptid_get_tid (ptid));
  204.   else if (ptid_get_lwp (ptid) != 0)
  205.     xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
  206.                ptid_get_pid (ptid), ptid_get_lwp (ptid));
  207.   else
  208.     xsnprintf (buf, sizeof (buf), "Process %d",
  209.                ptid_get_pid (ptid));

  211.   return buf;
  212. }

  214. int
  215. ‌kill_inferior (int pid)
  216. {
  217.   gdb_agent_about_to_close (pid);

  219.   return (*the_target->kill) (pid);
  220. }