contrib/gdb-6.2.1/gdb/fbsd-proc.c

   1 /* FreeBSD-specific methods for using the /proc file system.
   2
   3    Copyright 2002, 2003 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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 2 of the License, or
  10    (at your option) any later version.
  11
  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.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "inferior.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27
  28 #include "gdb_assert.h"
  29 #include "gdb_string.h"
  30 #include <sys/procfs.h>
  31 #include <sys/types.h>
  32
  33 #include "elf-bfd.h"
  34
  35 char *
  36 child_pid_to_exec_file (int pid)
  37 {
  38   char *path;
  39   char *buf;
  40
  41   path = xstrprintf ("/proc/%d/file", pid);
  42   buf = xcalloc (MAXPATHLEN, sizeof (char));
  43   make_cleanup (xfree, path);
  44   make_cleanup (xfree, buf);
  45
  46   if (readlink (path, buf, MAXPATHLEN) > 0)
  47     return buf;
  48
  49   return NULL;
  50 }
  51
  52 static int
  53 read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
  54               char *protection)
  55 {
  56   /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */
  57   char buf[256];
  58   int resident, privateresident;
  59   unsigned long obj;
  60   int ret = EOF;
  61
  62   /* As of FreeBSD 5.0-RELEASE, the layout is described in
  63      /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a
  64      new column was added to the procfs map.  Therefore we can't use
  65      fscanf since we need to support older releases too.  */
  66   if (fgets (buf, sizeof buf, mapfile) != NULL)
  67     ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
  68                   &resident, &privateresident, &obj, protection);
  69
  70   return (ret != 0 && ret != EOF);
  71 }
  72
  73 static int
  74 fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
  75                                        int, int, int, void *),
  76                           void *obfd)
  77 {
  78   pid_t pid = ptid_get_pid (inferior_ptid);
  79   char *mapfilename;
  80   FILE *mapfile;
  81   unsigned long start, end, size;
  82   char protection[4];
  83   int read, write, exec;
  84
  85   mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
  86   mapfile = fopen (mapfilename, "r");
  87   if (mapfile == NULL)
  88     error ("Couldn't open %s\n", mapfilename);
  89
  90   if (info_verbose)
  91     fprintf_filtered (gdb_stdout,
  92                       "Reading memory regions from %s\n", mapfilename);
  93
  94   /* Now iterate until end-of-file.  */
  95   while (read_mapping (mapfile, &start, &end, &protection[0]))
  96     {
  97       size = end - start;
  98
  99       read = (strchr (protection, 'r') != 0);
 100       write = (strchr (protection, 'w') != 0);
 101       exec = (strchr (protection, 'x') != 0);
 102
 103       if (info_verbose)
 104         {
 105           fprintf_filtered (gdb_stdout,
 106                             "Save segment, %ld bytes at 0x%s (%c%c%c)\n",
 107                             size, paddr_nz (start),
 108                             read ? 'r' : '-',
 109                             write ? 'w' : '-',
 110                             exec ? 'x' : '-');
 111         }
 112
 113       /* Invoke the callback function to create the corefile segment. */
 114       func (start, size, read, write, exec, obfd);
 115     }
 116
 117   fclose (mapfile);
 118   return 0;
 119 }
 120
 121 static char *
 122 fbsd_make_corefile_notes (bfd *obfd, int *note_size)
 123 {
 124   struct gdbarch *gdbarch = current_gdbarch;
 125   const struct regcache *regcache = current_regcache;
 126   gregset_t gregs;
 127   fpregset_t fpregs;
 128   char *note_data = NULL;
 129   Elf_Internal_Ehdr *i_ehdrp;
 130   const struct regset *regset;
 131   size_t size;
 132
 133   /* Put a "FreeBSD" label in the ELF header.  */
 134   i_ehdrp = elf_elfheader (obfd);
 135   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 136
 137   gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
 138
 139   size = sizeof gregs;
 140   regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
 141   gdb_assert (regset && regset->collect_regset);
 142   regset->collect_regset (regset, regcache, -1, &gregs, size);
 143
 144   note_data = elfcore_write_prstatus (obfd, note_data, note_size,
 145                                       ptid_get_pid (inferior_ptid),
 146                                       stop_signal, &gregs);
 147
 148   size = sizeof fpregs;
 149   regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
 150   gdb_assert (regset && regset->collect_regset);
 151   regset->collect_regset (regset, regcache, -1, &fpregs, size);
 152
 153   note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
 154                                      &fpregs, sizeof (fpregs));
 155
 156   if (get_exec_file (0))
 157     {
 158       char *fname = strrchr (get_exec_file (0), '/') + 1;
 159       char *psargs = xstrdup (fname);
 160
 161       if (get_inferior_args ())
 162         psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
 163
 164       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 165                                           fname, psargs);
 166     }
 167
 168   make_cleanup (xfree, note_data);
 169   return note_data;
 170 }
 171 \f
 172
 173 void
 174 _initialize_fbsd_proc (void)
 175 {
 176   extern void inftarg_set_find_memory_regions ();
 177   extern void inftarg_set_make_corefile_notes ();
 178
 179   inftarg_set_find_memory_regions (fbsd_find_memory_regions);
 180   inftarg_set_make_corefile_notes (fbsd_make_corefile_notes);
 181 }