gdb/fbsd-nat.c

   1 /* Native-dependent code for FreeBSD.
   2
   3    Copyright (C) 2002, 2003, 2004, 2007 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, 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/types.h>
  31 #include <sys/procfs.h>
  32 #include <sys/sysctl.h>
  33
  34 #include "elf-bfd.h"
  35 #include "fbsd-nat.h"
  36
  37 /* Return a the name of file that can be opened to get the symbols for
  38    the child process identified by PID.  */
  39
  40 char *
  41 fbsd_pid_to_exec_file (int pid)
  42 {
  43   size_t len = MAXPATHLEN;
  44   char *buf = xcalloc (len, sizeof (char));
  45   char *path;
  46
  47 #ifdef KERN_PROC_PATHNAME
  48   int mib[4];
  49
  50   mib[0] = CTL_KERN;
  51   mib[1] = KERN_PROC;
  52   mib[2] = KERN_PROC_PATHNAME;
  53   mib[3] = pid;
  54   if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
  55     return buf;
  56 #endif
  57
  58   path = xstrprintf ("/proc/%d/file", pid);
  59   if (readlink (path, buf, MAXPATHLEN) == -1)
  60     {
  61       xfree (buf);
  62       buf = NULL;
  63     }
  64
  65   xfree (path);
  66   return buf;
  67 }
  68
  69 static int
  70 fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
  71                    char *protection)
  72 {
  73   /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */
  74   char buf[256];
  75   int resident, privateresident;
  76   unsigned long obj;
  77   int ret = EOF;
  78
  79   /* As of FreeBSD 5.0-RELEASE, the layout is described in
  80      /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a
  81      new column was added to the procfs map.  Therefore we can't use
  82      fscanf since we need to support older releases too.  */
  83   if (fgets (buf, sizeof buf, mapfile) != NULL)
  84     ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
  85                   &resident, &privateresident, &obj, protection);
  86
  87   return (ret != 0 && ret != EOF);
  88 }
  89
  90 /* Iterate over all the memory regions in the current inferior,
  91    calling FUNC for each memory region.  OBFD is passed as the last
  92    argument to FUNC.  */
  93
  94 int
  95 fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
  96                                        int, int, int, void *),
  97                           void *obfd)
  98 {
  99   pid_t pid = ptid_get_pid (inferior_ptid);
 100   char *mapfilename;
 101   FILE *mapfile;
 102   unsigned long start, end, size;
 103   char protection[4];
 104   int read, write, exec;
 105
 106   mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
 107   mapfile = fopen (mapfilename, "r");
 108   if (mapfile == NULL)
 109     error (_("Couldn't open %s."), mapfilename);
 110
 111   if (info_verbose)
 112     fprintf_filtered (gdb_stdout,
 113                       "Reading memory regions from %s\n", mapfilename);
 114
 115   /* Now iterate until end-of-file.  */
 116   while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
 117     {
 118       size = end - start;
 119
 120       read = (strchr (protection, 'r') != 0);
 121       write = (strchr (protection, 'w') != 0);
 122       exec = (strchr (protection, 'x') != 0);
 123
 124       if (info_verbose)
 125         {
 126           fprintf_filtered (gdb_stdout,
 127                             "Save segment, %ld bytes at 0x%s (%c%c%c)\n",
 128                             size, paddr_nz (start),
 129                             read ? 'r' : '-',
 130                             write ? 'w' : '-',
 131                             exec ? 'x' : '-');
 132         }
 133
 134       /* Invoke the callback function to create the corefile segment. */
 135       func (start, size, read, write, exec, obfd);
 136     }
 137
 138   fclose (mapfile);
 139   return 0;
 140 }
 141
 142 /* Create appropriate note sections for a corefile, returning them in
 143    allocated memory.  */
 144
 145 char *
 146 fbsd_make_corefile_notes (bfd *obfd, int *note_size)
 147 {
 148   struct gdbarch *gdbarch = current_gdbarch;
 149   const struct regcache *regcache = get_current_regcache ();
 150   gregset_t gregs;
 151   fpregset_t fpregs;
 152   char *note_data = NULL;
 153   Elf_Internal_Ehdr *i_ehdrp;
 154   const struct regset *regset;
 155   size_t size;
 156
 157   /* Put a "FreeBSD" label in the ELF header.  */
 158   i_ehdrp = elf_elfheader (obfd);
 159   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 160
 161   gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
 162
 163   size = sizeof gregs;
 164   regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
 165   gdb_assert (regset && regset->collect_regset);
 166   regset->collect_regset (regset, regcache, -1, &gregs, size);
 167
 168   note_data = elfcore_write_prstatus (obfd, note_data, note_size,
 169                                       ptid_get_pid (inferior_ptid),
 170                                       stop_signal, &gregs);
 171
 172   size = sizeof fpregs;
 173   regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
 174   gdb_assert (regset && regset->collect_regset);
 175   regset->collect_regset (regset, regcache, -1, &fpregs, size);
 176
 177   note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
 178                                      &fpregs, sizeof (fpregs));
 179
 180   if (get_exec_file (0))
 181     {
 182       char *fname = strrchr (get_exec_file (0), '/') + 1;
 183       char *psargs = xstrdup (fname);
 184
 185       if (get_inferior_args ())
 186         psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
 187
 188       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 189                                           fname, psargs);
 190     }
 191
 192   make_cleanup (xfree, note_data);
 193   return note_data;
 194 }