gdb/fbsd-nat.c - gdb

Functions defined

Source code

  1. /* Native-dependent code for FreeBSD.

  3.    Copyright (C) 2002-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

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

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

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

  20. #include "defs.h"
  21. #include "gdbcore.h"
  22. #include "inferior.h"
  23. #include "regcache.h"
  24. #include "regset.h"
  25. #include "gdbthread.h"
  26. #include <sys/types.h>
  27. #include <sys/procfs.h>
  28. #include <sys/sysctl.h>

  30. #include "elf-bfd.h"
  31. #include "fbsd-nat.h"

  33. /* Return the name of a file that can be opened to get the symbols for
  34.    the child process identified by PID.  */

  36. char *
  37. ‌fbsd_pid_to_exec_file (struct target_ops *self, int pid)
  38. {
  39.   ssize_t len = PATH_MAX;
  40.   static char buf[PATH_MAX];
  41.   char name[PATH_MAX];

  43. #ifdef KERN_PROC_PATHNAME
  44.   int mib[4];

  46.   mib[0] = CTL_KERN;
  47.   mib[1] = KERN_PROC;
  48.   mib[2] = KERN_PROC_PATHNAME;
  49.   mib[3] = pid;
  50.   if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
  51.     return buf;
  52. #endif

  54.   xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
  55.   len = readlink (name, buf, PATH_MAX - 1);
  56.   if (len != -1)
  57.     {
  58.       buf[len] = '\0';
  59.       return buf;
  60.     }

  62.   return NULL;
  63. }

  65. static int
  66. ‌fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
  67.                    char *protection)
  68. {
  69.   /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */
  70.   char buf[256];
  71.   int resident, privateresident;
  72.   unsigned long obj;
  73.   int ret = EOF;

  75.   /* As of FreeBSD 5.0-RELEASE, the layout is described in
  76.      /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a
  77.      new column was added to the procfs map.  Therefore we can't use
  78.      fscanf since we need to support older releases too.  */
  79.   if (fgets (buf, sizeof buf, mapfile) != NULL)
  80.     ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
  81.                   &resident, &privateresident, &obj, protection);

  83.   return (ret != 0 && ret != EOF);
  84. }

  86. /* Iterate over all the memory regions in the current inferior,
  87.    calling FUNC for each memory region.  OBFD is passed as the last
  88.    argument to FUNC.  */

  90. int
  91. ‌fbsd_find_memory_regions (struct target_ops *self,
  92.                           find_memory_region_ftype func, void *obfd)
  93. {
  94.   pid_t pid = ptid_get_pid (inferior_ptid);
  95.   char *mapfilename;
  96.   FILE *mapfile;
  97.   unsigned long start, end, size;
  98.   char protection[4];
  99.   int read, write, exec;
  100.   struct cleanup *cleanup;

  102.   mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
  103.   cleanup = make_cleanup (xfree, mapfilename);
  104.   mapfile = fopen (mapfilename, "r");
  105.   if (mapfile == NULL)
  106.     error (_("Couldn't open %s."), mapfilename);
  107.   make_cleanup_fclose (mapfile);

  109.   if (info_verbose)
  110.     fprintf_filtered (gdb_stdout,
  111.                       "Reading memory regions from %s\n", mapfilename);

  113.   /* Now iterate until end-of-file.  */
  114.   while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
  115.     {
  116.       size = end - start;

  118.       read = (strchr (protection, 'r') != 0);
  119.       write = (strchr (protection, 'w') != 0);
  120.       exec = (strchr (protection, 'x') != 0);

  122.       if (info_verbose)
  123.         {
  124.           fprintf_filtered (gdb_stdout,
  125.                             "Save segment, %ld bytes at %s (%c%c%c)\n",
  126.                             size, paddress (target_gdbarch (), start),
  127.                             read ? 'r' : '-',
  128.                             write ? 'w' : '-',
  129.                             exec ? 'x' : '-');
  130.         }

  132.       /* Invoke the callback function to create the corefile segment.
  133.          Pass MODIFIED as true, we do not know the real modification state.  */
  134.       func (start, size, read, write, exec, 1, obfd);
  135.     }

  137.   do_cleanups (cleanup);
  138.   return 0;
  139. }