1 /* Native-dependent code for FreeBSD.
2
3 Copyright 2002, 2003, 2004 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 "regcache.h"
26 #include "regset.h"
27
28 #include "gdb_assert.h"
29 #include "gdb_string.h"
30 #include <sys/procfs.h>
31 #include <sys/types.h>
32
33 #include "elf-bfd.h"
34 #include "fbsd-nat.h"
35
36 /* Return a the name of file that can be opened to get the symbols for
37 the child process identified by PID. */
38
39 char *
fbsd_pid_to_exec_file(int pid)40 fbsd_pid_to_exec_file (int pid)
41 {
42 char *path;
43 char *buf;
44
45 path = xstrprintf ("/proc/%d/file", pid);
46 buf = xcalloc (MAXPATHLEN, sizeof (char));
47 make_cleanup (xfree, path);
48 make_cleanup (xfree, buf);
49
50 if (readlink (path, buf, MAXPATHLEN) > 0)
51 return buf;
52
53 return NULL;
54 }
55
56 static int
fbsd_read_mapping(FILE * mapfile,unsigned long * start,unsigned long * end,char * protection)57 fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
58 char *protection)
59 {
60 /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */
61 char buf[256];
62 int resident, privateresident;
63 unsigned long obj;
64 int ret = EOF;
65
66 /* As of FreeBSD 5.0-RELEASE, the layout is described in
67 /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a
68 new column was added to the procfs map. Therefore we can't use
69 fscanf since we need to support older releases too. */
70 if (fgets (buf, sizeof buf, mapfile) != NULL)
71 ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
72 &resident, &privateresident, &obj, protection);
73
74 return (ret != 0 && ret != EOF);
75 }
76
77 /* Iterate over all the memory regions in the current inferior,
78 calling FUNC for each memory region. OBFD is passed as the last
79 argument to FUNC. */
80
81 int
fbsd_find_memory_regions(int (* func)(CORE_ADDR,unsigned long,int,int,int,void *),void * obfd)82 fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
83 int, int, int, void *),
84 void *obfd)
85 {
86 pid_t pid = ptid_get_pid (inferior_ptid);
87 char *mapfilename;
88 FILE *mapfile;
89 unsigned long start, end, size;
90 char protection[4];
91 int read, write, exec;
92
93 mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
94 mapfile = fopen (mapfilename, "r");
95 if (mapfile == NULL)
96 error ("Couldn't open %s\n", mapfilename);
97
98 if (info_verbose)
99 fprintf_filtered (gdb_stdout,
100 "Reading memory regions from %s\n", mapfilename);
101
102 /* Now iterate until end-of-file. */
103 while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
104 {
105 size = end - start;
106
107 read = (strchr (protection, 'r') != 0);
108 write = (strchr (protection, 'w') != 0);
109 exec = (strchr (protection, 'x') != 0);
110
111 if (info_verbose)
112 {
113 fprintf_filtered (gdb_stdout,
114 "Save segment, %ld bytes at 0x%s (%c%c%c)\n",
115 size, paddr_nz (start),
116 read ? 'r' : '-',
117 write ? 'w' : '-',
118 exec ? 'x' : '-');
119 }
120
121 /* Invoke the callback function to create the corefile segment. */
122 func (start, size, read, write, exec, obfd);
123 }
124
125 fclose (mapfile);
126 return 0;
127 }
128
129 /* Create appropriate note sections for a corefile, returning them in
130 allocated memory. */
131
132 char *
fbsd_make_corefile_notes(bfd * obfd,int * note_size)133 fbsd_make_corefile_notes (bfd *obfd, int *note_size)
134 {
135 struct gdbarch *gdbarch = current_gdbarch;
136 const struct regcache *regcache = current_regcache;
137 gregset_t gregs;
138 fpregset_t fpregs;
139 char *note_data = NULL;
140 Elf_Internal_Ehdr *i_ehdrp;
141 const struct regset *regset;
142 size_t size;
143
144 /* Put a "FreeBSD" label in the ELF header. */
145 i_ehdrp = elf_elfheader (obfd);
146 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
147
148 gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
149
150 size = sizeof gregs;
151 regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
152 gdb_assert (regset && regset->collect_regset);
153 regset->collect_regset (regset, regcache, -1, &gregs, size);
154
155 note_data = elfcore_write_prstatus (obfd, note_data, note_size,
156 ptid_get_pid (inferior_ptid),
157 stop_signal, &gregs);
158
159 size = sizeof fpregs;
160 regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
161 gdb_assert (regset && regset->collect_regset);
162 regset->collect_regset (regset, regcache, -1, &fpregs, size);
163
164 note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
165 &fpregs, sizeof (fpregs));
166
167 if (get_exec_file (0))
168 {
169 char *fname = strrchr (get_exec_file (0), '/') + 1;
170 char *psargs = xstrdup (fname);
171
172 if (get_inferior_args ())
173 psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
174
175 note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
176 fname, psargs);
177 }
178
179 make_cleanup (xfree, note_data);
180 return note_data;
181 }
182