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 "gdb_string.h"
  26
  27 #include <sys/procfs.h>
  28 #include <sys/types.h>
  29
  30 #include "elf-bfd.h"
  31
  32 #include "gregset.h"
  33
  34 char *
  35 child_pid_to_exec_file (int pid)
  36 {
  37   char *path;
  38   char *buf;
  39
  40   xasprintf (&path, "/proc/%d/file", pid);
  41   buf = xcalloc (MAXPATHLEN, sizeof (char));
  42   make_cleanup (xfree, path);
  43   make_cleanup (xfree, buf);
  44
  45   if (readlink (path, buf, MAXPATHLEN) > 0)
  46     return buf;
  47
  48   return NULL;
  49 }
  50
  51 static int
  52 read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
  53               char *protection)
  54 {
  55   /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */
  56   char buf[256];
  57   int resident, privateresident;
  58   unsigned long obj;
  59   int ret = EOF;
  60
  61   /* As of FreeBSD 5.0-RELEASE, the layout is described in
  62      /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a
  63      new column was added to the procfs map.  Therefore we can't use
  64      fscanf since we need to support older releases too.  */
  65   if (fgets (buf, sizeof buf, mapfile) != NULL)
  66     ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
  67                   &resident, &privateresident, &obj, protection);
  68
  69   return (ret != 0 && ret != EOF);
  70 }
  71
  72 static int
  73 fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
  74                                        int, int, int, void *),
  75                           void *obfd)
  76 {
  77   pid_t pid = ptid_get_pid (inferior_ptid);
  78   char *mapfilename;
  79   FILE *mapfile;
  80   unsigned long start, end, size;
  81   char protection[4];
  82   int read, write, exec;
  83
  84   xasprintf (&mapfilename, "/proc/%ld/map", (long) pid);
  85   mapfile = fopen (mapfilename, "r");
  86   if (mapfile == NULL)
  87     error ("Couldn't open %s\n", mapfilename);
  88
  89   if (info_verbose)
  90     fprintf_filtered (gdb_stdout,
  91                       "Reading memory regions from %s\n", mapfilename);
  92
  93   /* Now iterate until end-of-file.  */
  94   while (read_mapping (mapfile, &start, &end, &protection[0]))
  95     {
  96       size = end - start;
  97
  98       read = (strchr (protection, 'r') != 0);
  99       write = (strchr (protection, 'w') != 0);
 100       exec = (strchr (protection, 'x') != 0);
 101
 102       if (info_verbose)
 103         {
 104           fprintf_filtered (gdb_stdout,
 105                             "Save segment, %ld bytes at 0x%s (%c%c%c)\n",
 106                             size, paddr_nz (start),
 107                             read ? 'r' : '-',
 108                             write ? 'w' : '-',
 109                             exec ? 'x' : '-');
 110         }
 111
 112       /* Invoke the callback function to create the corefile segment. */
 113       func (start, size, read, write, exec, obfd);
 114     }
 115
 116   fclose (mapfile);
 117   return 0;
 118 }
 119
 120 static char *
 121 fbsd_make_corefile_notes (bfd *obfd, int *note_size)
 122 {
 123   gregset_t gregs;
 124   fpregset_t fpregs;
 125   char *note_data = NULL;
 126   Elf_Internal_Ehdr *i_ehdrp;
 127
 128   /* Put a "FreeBSD" label in the ELF header.  */
 129   i_ehdrp = elf_elfheader (obfd);
 130   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 131
 132   fill_gregset (&gregs, -1);
 133   note_data = elfcore_write_prstatus (obfd, note_data, note_size,
 134                                       ptid_get_pid (inferior_ptid),
 135                                       stop_signal, &gregs);
 136
 137   fill_fpregset (&fpregs, -1);
 138   note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
 139                                      &fpregs, sizeof (fpregs));
 140
 141   if (get_exec_file (0))
 142     {
 143       char *fname = strrchr (get_exec_file (0), '/') + 1;
 144       char *psargs = xstrdup (fname);
 145
 146       if (get_inferior_args ())
 147         psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
 148
 149       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 150                                           fname, psargs);
 151     }
 152
 153   make_cleanup (xfree, note_data);
 154   return note_data;
 155 }
 156 \f
 157
 158 void
 159 _initialize_fbsd_proc (void)
 160 {
 161   extern void inftarg_set_find_memory_regions ();
 162   extern void inftarg_set_make_corefile_notes ();
 163
 164   inftarg_set_find_memory_regions (fbsd_find_memory_regions);
 165   inftarg_set_make_corefile_notes (fbsd_make_corefile_notes);
 166 }