gdb/fbsd-nat.c

   1 /* Native-dependent code for FreeBSD.
   2
   3    Copyright 2002, 2003, 2004 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 #include "fbsd-nat.h"
  35
  36 /* Return a the name of file that can be opened to get the symbols for
  37    the child process identified by PID.  */
  38
  39 char *
  40 fbsd_pid_to_exec_file (int pid)
  41 {
  42   char *path;
  43   char *buf;
  44
  45   path = xstrprintf ("/proc/%d/file", pid);
  46   buf = xcalloc (MAXPATHLEN, sizeof (char));
  47   make_cleanup (xfree, path);
  48   make_cleanup (xfree, buf);
  49
  50   if (readlink (path, buf, MAXPATHLEN) > 0)
  51     return buf;
  52
  53   return NULL;
  54 }
  55
  56 static int
  57 fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
  58                    char *protection)
  59 {
  60   /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */
  61   char buf[256];
  62   int resident, privateresident;
  63   unsigned long obj;
  64   int ret = EOF;
  65
  66   /* As of FreeBSD 5.0-RELEASE, the layout is described in
  67      /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a
  68      new column was added to the procfs map.  Therefore we can't use
  69      fscanf since we need to support older releases too.  */
  70   if (fgets (buf, sizeof buf, mapfile) != NULL)
  71     ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
  72                   &resident, &privateresident, &obj, protection);
  73
  74   return (ret != 0 && ret != EOF);
  75 }
  76
  77 /* Iterate over all the memory regions in the current inferior,
  78    calling FUNC for each memory region.  OBFD is passed as the last
  79    argument to FUNC.  */
  80
  81 int
  82 fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
  83                                        int, int, int, void *),
  84                           void *obfd)
  85 {
  86   pid_t pid = ptid_get_pid (inferior_ptid);
  87   char *mapfilename;
  88   FILE *mapfile;
  89   unsigned long start, end, size;
  90   char protection[4];
  91   int read, write, exec;
  92
  93   mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
  94   mapfile = fopen (mapfilename, "r");
  95   if (mapfile == NULL)
  96     error (_("Couldn't open %s."), mapfilename);
  97
  98   if (info_verbose)
  99     fprintf_filtered (gdb_stdout,
 100                       "Reading memory regions from %s\n", mapfilename);
 101
 102   /* Now iterate until end-of-file.  */
 103   while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
 104     {
 105       size = end - start;
 106
 107       read = (strchr (protection, 'r') != 0);
 108       write = (strchr (protection, 'w') != 0);
 109       exec = (strchr (protection, 'x') != 0);
 110
 111       if (info_verbose)
 112         {
 113           fprintf_filtered (gdb_stdout,
 114                             "Save segment, %ld bytes at 0x%s (%c%c%c)\n",
 115                             size, paddr_nz (start),
 116                             read ? 'r' : '-',
 117                             write ? 'w' : '-',
 118                             exec ? 'x' : '-');
 119         }
 120
 121       /* Invoke the callback function to create the corefile segment. */
 122       func (start, size, read, write, exec, obfd);
 123     }
 124
 125   fclose (mapfile);
 126   return 0;
 127 }
 128
 129 /* Create appropriate note sections for a corefile, returning them in
 130    allocated memory.  */
 131
 132 char *
 133 fbsd_make_corefile_notes (bfd *obfd, int *note_size)
 134 {
 135   struct gdbarch *gdbarch = current_gdbarch;
 136   const struct regcache *regcache = current_regcache;
 137   gregset_t gregs;
 138   fpregset_t fpregs;
 139   char *note_data = NULL;
 140   Elf_Internal_Ehdr *i_ehdrp;
 141   const struct regset *regset;
 142   size_t size;
 143
 144   /* Put a "FreeBSD" label in the ELF header.  */
 145   i_ehdrp = elf_elfheader (obfd);
 146   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 147
 148   gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
 149
 150   size = sizeof gregs;
 151   regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
 152   gdb_assert (regset && regset->collect_regset);
 153   regset->collect_regset (regset, regcache, -1, &gregs, size);
 154
 155   note_data = elfcore_write_prstatus (obfd, note_data, note_size,
 156                                       ptid_get_pid (inferior_ptid),
 157                                       stop_signal, &gregs);
 158
 159   size = sizeof fpregs;
 160   regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
 161   gdb_assert (regset && regset->collect_regset);
 162   regset->collect_regset (regset, regcache, -1, &fpregs, size);
 163
 164   note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
 165                                      &fpregs, sizeof (fpregs));
 166
 167   if (get_exec_file (0))
 168     {
 169       char *fname = strrchr (get_exec_file (0), '/') + 1;
 170       char *psargs = xstrdup (fname);
 171
 172       if (get_inferior_args ())
 173         psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
 174
 175       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 176                                           fname, psargs);
 177     }
 178
 179   make_cleanup (xfree, note_data);
 180   return note_data;
 181 }