1/* Native-dependent code for FreeBSD.
2
3   Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
4   Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
21#include "defs.h"
22#include "gdbcore.h"
23#include "inferior.h"
24#include "regcache.h"
25#include "regset.h"
26#include "gdbthread.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 the name of a file that can be opened to get the symbols for
38   the child process identified by PID.  */
39
40char *
41fbsd_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
69static int
70fbsd_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
94int
95fbsd_find_memory_regions (find_memory_region_ftype func, void *obfd)
96{
97  pid_t pid = ptid_get_pid (inferior_ptid);
98  char *mapfilename;
99  FILE *mapfile;
100  unsigned long start, end, size;
101  char protection[4];
102  int read, write, exec;
103  struct cleanup *cleanup;
104
105  mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
106  cleanup = make_cleanup (xfree, mapfilename);
107  mapfile = fopen (mapfilename, "r");
108  if (mapfile == NULL)
109    error (_("Couldn't open %s."), mapfilename);
110  make_cleanup_fclose (mapfile);
111
112  if (info_verbose)
113    fprintf_filtered (gdb_stdout,
114		      "Reading memory regions from %s\n", mapfilename);
115
116  /* Now iterate until end-of-file.  */
117  while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
118    {
119      size = end - start;
120
121      read = (strchr (protection, 'r') != 0);
122      write = (strchr (protection, 'w') != 0);
123      exec = (strchr (protection, 'x') != 0);
124
125      if (info_verbose)
126	{
127	  fprintf_filtered (gdb_stdout,
128			    "Save segment, %ld bytes at %s (%c%c%c)\n",
129			    size, paddress (target_gdbarch, start),
130			    read ? 'r' : '-',
131			    write ? 'w' : '-',
132			    exec ? 'x' : '-');
133	}
134
135      /* Invoke the callback function to create the corefile segment.  */
136      func (start, size, read, write, exec, obfd);
137    }
138
139  do_cleanups (cleanup);
140  return 0;
141}
142
143static int
144find_signalled_thread (struct thread_info *info, void *data)
145{
146  if (info->suspend.stop_signal != TARGET_SIGNAL_0
147      && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
148    return 1;
149
150  return 0;
151}
152
153static enum target_signal
154find_stop_signal (void)
155{
156  struct thread_info *info =
157    iterate_over_threads (find_signalled_thread, NULL);
158
159  if (info)
160    return info->suspend.stop_signal;
161  else
162    return TARGET_SIGNAL_0;
163}
164
165/* Create appropriate note sections for a corefile, returning them in
166   allocated memory.  */
167
168char *
169fbsd_make_corefile_notes (bfd *obfd, int *note_size)
170{
171  const struct regcache *regcache = get_current_regcache ();
172  struct gdbarch *gdbarch = get_regcache_arch (regcache);
173  gregset_t gregs;
174  fpregset_t fpregs;
175  char *note_data = NULL;
176  Elf_Internal_Ehdr *i_ehdrp;
177  const struct regset *regset;
178  size_t size;
179
180  /* Put a "FreeBSD" label in the ELF header.  */
181  i_ehdrp = elf_elfheader (obfd);
182  i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
183
184  gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
185
186  size = sizeof gregs;
187  regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
188  gdb_assert (regset && regset->collect_regset);
189  regset->collect_regset (regset, regcache, -1, &gregs, size);
190
191  note_data = elfcore_write_prstatus (obfd, note_data, note_size,
192				      ptid_get_pid (inferior_ptid),
193				      find_stop_signal (), &gregs);
194
195  size = sizeof fpregs;
196  regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
197  gdb_assert (regset && regset->collect_regset);
198  regset->collect_regset (regset, regcache, -1, &fpregs, size);
199
200  note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
201				     &fpregs, sizeof (fpregs));
202
203  if (get_exec_file (0))
204    {
205      const char *fname = lbasename (get_exec_file (0));
206      char *psargs = xstrdup (fname);
207
208      if (get_inferior_args ())
209	psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
210			   (char *) NULL);
211
212      note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
213					  fname, psargs);
214    }
215
216  make_cleanup (xfree, note_data);
217  return note_data;
218}
219