Upgrade GDB from 7.4.1 to 7.6.1 on the vendor branch
[dragonfly.git] / contrib / gdb-7 / gdb / fbsd-nat.c
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1/* Native-dependent code for FreeBSD.
2
ef5ccd6c 3 Copyright (C) 2002-2013 Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
19
20#include "defs.h"
21#include "gdbcore.h"
22#include "inferior.h"
23#include "regcache.h"
24#include "regset.h"
25#include "gdbthread.h"
26
27#include "gdb_assert.h"
28#include "gdb_string.h"
29#include <sys/types.h>
30#include <sys/procfs.h>
31#include <sys/sysctl.h>
32
33#include "elf-bfd.h"
34#include "fbsd-nat.h"
35
c50c785c 36/* Return the name of a file that can be opened to get the symbols for
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37 the child process identified by PID. */
38
39char *
40fbsd_pid_to_exec_file (int pid)
41{
42 size_t len = MAXPATHLEN;
43 char *buf = xcalloc (len, sizeof (char));
44 char *path;
45
46#ifdef KERN_PROC_PATHNAME
47 int mib[4];
48
49 mib[0] = CTL_KERN;
50 mib[1] = KERN_PROC;
51 mib[2] = KERN_PROC_PATHNAME;
52 mib[3] = pid;
53 if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
54 return buf;
55#endif
56
57 path = xstrprintf ("/proc/%d/file", pid);
ef5ccd6c 58 if (readlink (path, buf, MAXPATHLEN - 1) == -1)
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59 {
60 xfree (buf);
61 buf = NULL;
62 }
63
64 xfree (path);
65 return buf;
66}
67
68static int
69fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
70 char *protection)
71{
72 /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */
73 char buf[256];
74 int resident, privateresident;
75 unsigned long obj;
76 int ret = EOF;
77
78 /* As of FreeBSD 5.0-RELEASE, the layout is described in
79 /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a
80 new column was added to the procfs map. Therefore we can't use
81 fscanf since we need to support older releases too. */
82 if (fgets (buf, sizeof buf, mapfile) != NULL)
83 ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
84 &resident, &privateresident, &obj, protection);
85
86 return (ret != 0 && ret != EOF);
87}
88
89/* Iterate over all the memory regions in the current inferior,
90 calling FUNC for each memory region. OBFD is passed as the last
91 argument to FUNC. */
92
93int
c50c785c 94fbsd_find_memory_regions (find_memory_region_ftype func, void *obfd)
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95{
96 pid_t pid = ptid_get_pid (inferior_ptid);
97 char *mapfilename;
98 FILE *mapfile;
99 unsigned long start, end, size;
100 char protection[4];
101 int read, write, exec;
102 struct cleanup *cleanup;
103
104 mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
105 cleanup = make_cleanup (xfree, mapfilename);
106 mapfile = fopen (mapfilename, "r");
107 if (mapfile == NULL)
108 error (_("Couldn't open %s."), mapfilename);
109 make_cleanup_fclose (mapfile);
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 %s (%c%c%c)\n",
ef5ccd6c 128 size, paddress (target_gdbarch (), start),
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129 read ? 'r' : '-',
130 write ? 'w' : '-',
131 exec ? 'x' : '-');
132 }
133
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134 /* Invoke the callback function to create the corefile segment.
135 Pass MODIFIED as true, we do not know the real modification state. */
136 func (start, size, read, write, exec, 1, obfd);
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137 }
138
139 do_cleanups (cleanup);
140 return 0;
141}
142
143static int
144find_signalled_thread (struct thread_info *info, void *data)
145{
ef5ccd6c 146 if (info->suspend.stop_signal != GDB_SIGNAL_0
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147 && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
148 return 1;
149
150 return 0;
151}
152
ef5ccd6c 153static enum gdb_signal
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154find_stop_signal (void)
155{
156 struct thread_info *info =
157 iterate_over_threads (find_signalled_thread, NULL);
158
159 if (info)
c50c785c 160 return info->suspend.stop_signal;
5796c8dc 161 else
ef5ccd6c 162 return GDB_SIGNAL_0;
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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 {
c50c785c 205 const char *fname = lbasename (get_exec_file (0));
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206 char *psargs = xstrdup (fname);
207
208 if (get_inferior_args ())
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209 psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
210 (char *) NULL);
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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}