1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/* Native-dependent code for FreeBSD.
Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "regset.h"
#include "gdbthread.h"
#include <sys/types.h>
#include <sys/procfs.h>
#include <sys/sysctl.h>
#ifdef HAVE_KINFO_GETVMMAP
#include <sys/user.h>
#include <libutil.h>
#endif
#include "elf-bfd.h"
#include "fbsd-nat.h"
/* Return the name of a file that can be opened to get the symbols for
the child process identified by PID. */
char *
fbsd_pid_to_exec_file (struct target_ops *self, int pid)
{
ssize_t len = PATH_MAX;
static char buf[PATH_MAX];
char name[PATH_MAX];
#ifdef KERN_PROC_PATHNAME
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PATHNAME;
mib[3] = pid;
if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
return buf;
#endif
xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
len = readlink (name, buf, PATH_MAX - 1);
if (len != -1)
{
buf[len] = '\0';
return buf;
}
return NULL;
}
#ifdef HAVE_KINFO_GETVMMAP
/* Iterate over all the memory regions in the current inferior,
calling FUNC for each memory region. OBFD is passed as the last
argument to FUNC. */
int
fbsd_find_memory_regions (struct target_ops *self,
find_memory_region_ftype func, void *obfd)
{
pid_t pid = ptid_get_pid (inferior_ptid);
struct kinfo_vmentry *vmentl, *kve;
uint64_t size;
struct cleanup *cleanup;
int i, nitems;
vmentl = kinfo_getvmmap (pid, &nitems);
if (vmentl == NULL)
perror_with_name (_("Couldn't fetch VM map entries."));
cleanup = make_cleanup (free, vmentl);
for (i = 0; i < nitems; i++)
{
kve = &vmentl[i];
/* Skip unreadable segments and those where MAP_NOCORE has been set. */
if (!(kve->kve_protection & KVME_PROT_READ)
|| kve->kve_flags & KVME_FLAG_NOCOREDUMP)
continue;
/* Skip segments with an invalid type. */
if (kve->kve_type != KVME_TYPE_DEFAULT
&& kve->kve_type != KVME_TYPE_VNODE
&& kve->kve_type != KVME_TYPE_SWAP
&& kve->kve_type != KVME_TYPE_PHYS)
continue;
size = kve->kve_end - kve->kve_start;
if (info_verbose)
{
fprintf_filtered (gdb_stdout,
"Save segment, %ld bytes at %s (%c%c%c)\n",
(long) size,
paddress (target_gdbarch (), kve->kve_start),
kve->kve_protection & KVME_PROT_READ ? 'r' : '-',
kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-',
kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-');
}
/* Invoke the callback function to create the corefile segment.
Pass MODIFIED as true, we do not know the real modification state. */
func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ,
kve->kve_protection & KVME_PROT_WRITE,
kve->kve_protection & KVME_PROT_EXEC, 1, obfd);
}
do_cleanups (cleanup);
return 0;
}
#else
static int
fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
char *protection)
{
/* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */
char buf[256];
int resident, privateresident;
unsigned long obj;
int ret = EOF;
/* As of FreeBSD 5.0-RELEASE, the layout is described in
/usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a
new column was added to the procfs map. Therefore we can't use
fscanf since we need to support older releases too. */
if (fgets (buf, sizeof buf, mapfile) != NULL)
ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
&resident, &privateresident, &obj, protection);
return (ret != 0 && ret != EOF);
}
/* Iterate over all the memory regions in the current inferior,
calling FUNC for each memory region. OBFD is passed as the last
argument to FUNC. */
int
fbsd_find_memory_regions (struct target_ops *self,
find_memory_region_ftype func, void *obfd)
{
pid_t pid = ptid_get_pid (inferior_ptid);
char *mapfilename;
FILE *mapfile;
unsigned long start, end, size;
char protection[4];
int read, write, exec;
struct cleanup *cleanup;
mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
cleanup = make_cleanup (xfree, mapfilename);
mapfile = fopen (mapfilename, "r");
if (mapfile == NULL)
error (_("Couldn't open %s."), mapfilename);
make_cleanup_fclose (mapfile);
if (info_verbose)
fprintf_filtered (gdb_stdout,
"Reading memory regions from %s\n", mapfilename);
/* Now iterate until end-of-file. */
while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
{
size = end - start;
read = (strchr (protection, 'r') != 0);
write = (strchr (protection, 'w') != 0);
exec = (strchr (protection, 'x') != 0);
if (info_verbose)
{
fprintf_filtered (gdb_stdout,
"Save segment, %ld bytes at %s (%c%c%c)\n",
size, paddress (target_gdbarch (), start),
read ? 'r' : '-',
write ? 'w' : '-',
exec ? 'x' : '-');
}
/* Invoke the callback function to create the corefile segment.
Pass MODIFIED as true, we do not know the real modification state. */
func (start, size, read, write, exec, 1, obfd);
}
do_cleanups (cleanup);
return 0;
}
#endif
|
