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
34 char *
child_pid_to_exec_file(int pid)35 child_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
51 static int
read_mapping(FILE * mapfile,unsigned long * start,unsigned long * end,char * protection)52 read_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
72 static int
fbsd_find_memory_regions(int (* func)(CORE_ADDR,unsigned long,int,int,int,void *),void * obfd)73 fbsd_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
120 static char *
fbsd_make_corefile_notes(bfd * obfd,int * note_size)121 fbsd_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
163 void
_initialize_fbsd_proc(void)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