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
34char *
35child_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
51static int
52read_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
72static int
73fbsd_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
120static char *
121fbsd_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  char fakename;
128
129  /* Put a "FreeBSD" label in the ELF header.  */
130  i_ehdrp = elf_elfheader (obfd);
131  i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
132
133  fill_gregset (&gregs, -1);
134  note_data = elfcore_write_prstatus (obfd, note_data, note_size,
135				      ptid_get_pid (inferior_ptid),
136				      stop_signal, &gregs);
137
138  fill_fpregset (&fpregs, -1);
139  note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
140				     &fpregs, sizeof (fpregs));
141
142  fakename = '\0';
143  note_data = elfcore_write_thrmisc (obfd, note_data, note_size,
144				     &fakename, sizeof (fakename));
145
146  if (get_exec_file (0))
147    {
148      char *fname = strrchr (get_exec_file (0), '/') + 1;
149      char *psargs = xstrdup (fname);
150
151      if (get_inferior_args ())
152	psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
153
154      note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
155					  fname, psargs);
156    }
157
158  make_cleanup (xfree, note_data);
159  return note_data;
160}
161
162
163void
164_initialize_fbsd_proc (void)
165{
166  extern void inftarg_set_find_memory_regions ();
167  extern void inftarg_set_make_corefile_notes ();
168
169  inftarg_set_find_memory_regions (fbsd_find_memory_regions);
170  inftarg_set_make_corefile_notes (fbsd_make_corefile_notes);
171}
172