1 /* IBM RS/6000 "XCOFF" back-end for BFD.
2 Copyright 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Written by Tom Rix
5 Contributed by Red Hat Inc.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
23
24 #include "bfd.h"
25
26 const bfd_target *xcoff64_core_p (bfd *);
27 bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *);
28 char *xcoff64_core_file_failing_command (bfd *);
29 int xcoff64_core_file_failing_signal (bfd *);
30
31 #ifdef AIX_5_CORE
32
33 #include "sysdep.h"
34 #include "libbfd.h"
35
36 /* Aix 5.1 system include file. */
37
38 /* Need to define this macro so struct ld_info64 get included. */
39 #define __LDINFO_PTRACE64__
40 #include <sys/ldr.h>
41 #include <core.h>
42
43 #define core_hdr(abfd) ((struct core_dumpxx *) abfd->tdata.any)
44
45 #define CHECK_FILE_OFFSET(s, v) \
46 ((bfd_signed_vma)(v) < 0 || (bfd_signed_vma)(v) > (bfd_signed_vma)(s).st_size)
47
48 const bfd_target *
xcoff64_core_p(bfd * abfd)49 xcoff64_core_p (bfd *abfd)
50 {
51 struct core_dumpxx core, *new_core_hdr;
52 struct stat statbuf;
53 asection *sec;
54 struct __ld_info64 ldinfo;
55 bfd_vma ld_offset;
56 bfd_size_type i;
57 struct vm_infox vminfo;
58 const bfd_target *return_value = NULL;
59
60 /* Get the header. */
61 if (bfd_seek (abfd, 0, SEEK_SET) != 0)
62 goto xcoff64_core_p_error;
63
64 if (sizeof (struct core_dumpxx)
65 != bfd_bread (&core, sizeof (struct core_dumpxx), abfd))
66 goto xcoff64_core_p_error;
67
68 if (bfd_stat (abfd, &statbuf) < 0)
69 goto xcoff64_core_p_error;
70
71 /* Sanity checks
72 c_flag has CORE_VERSION_1, Aix 4+
73 c_entries = 0 for Aix 4.3+
74 IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process.
75
76 We will still be confused if a Aix 4.3 64 bit core file is
77 copied over to a Aix 5 machine.
78
79 Check file header offsets
80
81 See rs6000-core.c for comment on size of core
82 If there isn't enough of a real core file, bail. */
83
84 if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1))
85 || (0 != core.c_entries)
86 || (! (IS_PROC64 (&core.c_u.U_proc)))
87 || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox)))
88 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader)))
89 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize)))
90 || ((CHECK_FILE_OFFSET (statbuf, core.c_thr)))
91 || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion)))
92 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack)))
93 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size)))
94 || ((CHECK_FILE_OFFSET (statbuf, core.c_data)))
95 || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize)))
96 || (! (core.c_flag & UBLOCK_VALID))
97 || (! (core.c_flag & LE_VALID)))
98 goto xcoff64_core_p_error;
99
100 /* Check for truncated stack or general truncating. */
101 if ((! (core.c_flag & USTACK_VALID))
102 || (core.c_flag & CORE_TRUNC))
103 {
104 bfd_set_error (bfd_error_file_truncated);
105
106 return return_value;
107 }
108
109 new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx));
110 if (NULL == new_core_hdr)
111 return return_value;
112
113 memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx));
114 /* The core_hdr() macro is no longer used here because it would
115 expand to code relying on gcc's cast-as-lvalue extension,
116 which was removed in gcc 4.0. */
117 abfd->tdata.any = new_core_hdr;
118
119 /* .stack section. */
120 sec = bfd_make_section_anyway (abfd, ".stack");
121 if (NULL == sec)
122 return return_value;
123
124 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
125 sec->size = core.c_size;
126 sec->vma = core.c_stackorg;
127 sec->filepos = core.c_stack;
128
129 /* .reg section for all registers. */
130 sec = bfd_make_section_anyway (abfd, ".reg");
131 if (NULL == sec)
132 return return_value;
133
134 sec->flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
135 sec->size = sizeof (struct __context64);
136 sec->vma = 0;
137 sec->filepos = 0;
138 sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
139
140 /* .ldinfo section.
141 To actually find out how long this section is in this particular
142 core dump would require going down the whole list of struct
143 ld_info's. See if we can just fake it. */
144 sec = bfd_make_section_anyway (abfd, ".ldinfo");
145 if (NULL == sec)
146 return return_value;
147
148 sec->flags = SEC_HAS_CONTENTS;
149 sec->size = core.c_lsize;
150 sec->vma = 0;
151 sec->filepos = core.c_loader;
152
153 /* AIX 4 adds data sections from loaded objects to the core file,
154 which can be found by examining ldinfo, and anonymously mmapped
155 regions. */
156
157 /* .data section from executable. */
158 sec = bfd_make_section_anyway (abfd, ".data");
159 if (NULL == sec)
160 return return_value;
161
162 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
163 sec->size = core.c_datasize;
164 sec->vma = core.c_dataorg;
165 sec->filepos = core.c_data;
166
167 /* .data sections from loaded objects. */
168 ld_offset = core.c_loader;
169
170 while (1)
171 {
172 if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
173 return return_value;
174
175 if (sizeof (struct __ld_info64) !=
176 bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
177 return return_value;
178
179 if (ldinfo.ldinfo_core)
180 {
181 sec = bfd_make_section_anyway (abfd, ".data");
182 if (NULL == sec)
183 return return_value;
184
185 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
186 sec->size = ldinfo.ldinfo_datasize;
187 sec->vma = ldinfo.ldinfo_dataorg;
188 sec->filepos = ldinfo.ldinfo_core;
189 }
190
191 if (0 == ldinfo.ldinfo_next)
192 break;
193 ld_offset += ldinfo.ldinfo_next;
194 }
195
196 /* .vmdata sections from anonymously mmapped regions. */
197 if (core.c_vmregions)
198 {
199 if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
200 return return_value;
201
202 for (i = 0; i < core.c_vmregions; i++)
203 if (sizeof (struct vm_infox) !=
204 bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
205 return return_value;
206
207 if (vminfo.vminfo_offset)
208 {
209 sec = bfd_make_section_anyway (abfd, ".vmdata");
210 if (NULL == sec)
211 return return_value;
212
213 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
214 sec->size = vminfo.vminfo_size;
215 sec->vma = vminfo.vminfo_addr;
216 sec->filepos = vminfo.vminfo_offset;
217 }
218 }
219
220 return_value = (bfd_target *) abfd->xvec; /* This is garbage for now. */
221
222 xcoff64_core_p_error:
223 if (bfd_get_error () != bfd_error_system_call)
224 bfd_set_error (bfd_error_wrong_format);
225
226 return return_value;
227 }
228
229 /* Return `TRUE' if given core is from the given executable. */
230
231 bfd_boolean
xcoff64_core_file_matches_executable_p(bfd * core_bfd,bfd * exec_bfd)232 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
233 {
234 struct core_dumpxx core;
235 char *path, *s;
236 size_t alloc;
237 const char *str1, *str2;
238 bfd_boolean return_value = FALSE;
239
240 /* Get the header. */
241 if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
242 return return_value;
243
244 if (sizeof (struct core_dumpxx) !=
245 bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
246 return return_value;
247
248 if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
249 return return_value;
250
251 alloc = 100;
252 path = bfd_malloc (alloc);
253 if (path == NULL)
254 return return_value;
255
256 s = path;
257
258 while (1)
259 {
260 if (bfd_bread (s, 1, core_bfd) != 1)
261 goto xcoff64_core_file_matches_executable_p_end_1;
262
263 if (*s == '\0')
264 break;
265 ++s;
266 if (s == path + alloc)
267 {
268 char *n;
269
270 alloc *= 2;
271 n = bfd_realloc (path, alloc);
272 if (n == NULL)
273 goto xcoff64_core_file_matches_executable_p_end_1;
274
275 s = n + (path - s);
276 path = n;
277 }
278 }
279
280 str1 = strrchr (path, '/');
281 str2 = strrchr (exec_bfd->filename, '/');
282
283 /* Step over character '/'. */
284 str1 = str1 != NULL ? str1 + 1 : path;
285 str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
286
287 if (strcmp (str1, str2) == 0)
288 return_value = TRUE;
289
290 xcoff64_core_file_matches_executable_p_end_1:
291 free (path);
292 return return_value;
293 }
294
295 char *
xcoff64_core_file_failing_command(bfd * abfd)296 xcoff64_core_file_failing_command (bfd *abfd)
297 {
298 struct core_dumpxx *c = core_hdr (abfd);
299 char *return_value = 0;
300
301 if (NULL != c)
302 return_value = c->c_u.U_proc.pi_comm;
303
304 return return_value;
305 }
306
307 int
xcoff64_core_file_failing_signal(bfd * abfd)308 xcoff64_core_file_failing_signal (bfd *abfd)
309 {
310 struct core_dumpxx *c = core_hdr (abfd);
311 int return_value = 0;
312
313 if (NULL != c)
314 return_value = c->c_signo;
315
316 return return_value;
317 }
318
319 #else /* AIX_5_CORE */
320
321 const bfd_target *
xcoff64_core_p(bfd * abfd ATTRIBUTE_UNUSED)322 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
323 {
324 bfd_set_error (bfd_error_wrong_format);
325 return 0;
326 }
327
328 bfd_boolean
xcoff64_core_file_matches_executable_p(bfd * core_bfd,bfd * exec_bfd)329 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
330 {
331 return generic_core_file_matches_executable_p (core_bfd, exec_bfd);
332 }
333
334 char *
xcoff64_core_file_failing_command(bfd * abfd ATTRIBUTE_UNUSED)335 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
336 {
337 return 0;
338 }
339
340 int
xcoff64_core_file_failing_signal(bfd * abfd ATTRIBUTE_UNUSED)341 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
342 {
343 return 0;
344 }
345
346 #endif /* AIX_5_CORE */
347