1 /* IBM RS/6000 "XCOFF" back-end for BFD.
2 Copyright (C) 2001-2023 Free Software Foundation, Inc.
3 Written by Tom Rix
4 Contributed by Red Hat Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25
26 bfd_cleanup xcoff64_core_p (bfd *);
27 bool 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 "libbfd.h"
34
35 /* Aix 5.1 system include file. */
36
37 /* Need to define this macro so struct ld_info64 get included. */
38 #define __LDINFO_PTRACE64__
39 #include <sys/ldr.h>
40 #include <core.h>
41
42 /* The default architecture and machine for matching core files. */
43 #define DEFAULT_ARCHITECTURE bfd_arch_powerpc
44 #define DEFAULT_MACHINE bfd_mach_ppc_620
45
46 #define core_hdr(abfd) ((struct core_dumpxx *) abfd->tdata.any)
47
48 #define CHECK_FILE_OFFSET(s, v) \
49 ((bfd_signed_vma)(v) < 0 || (bfd_signed_vma)(v) > (bfd_signed_vma)(s).st_size)
50
51 bfd_cleanup
52 xcoff64_core_p (bfd *abfd)
53 {
54 enum bfd_architecture arch;
55 unsigned long mach;
56 struct core_dumpxx core, *new_core_hdr;
57 struct stat statbuf;
58 asection *sec;
59 struct __ld_info64 ldinfo;
60 bfd_vma ld_offset;
61 bfd_size_type i;
62 struct vm_infox vminfo;
63 flagword flags;
64
65 /* Get the header. */
66 if (bfd_seek (abfd, 0, SEEK_SET) != 0)
67 goto xcoff64_core_p_error;
68
69 if (sizeof (struct core_dumpxx)
70 != bfd_bread (&core, sizeof (struct core_dumpxx), abfd))
71 goto xcoff64_core_p_error;
72
73 if (bfd_stat (abfd, &statbuf) < 0)
74 goto xcoff64_core_p_error;
75
76 /* Sanity checks
77 c_flag has CORE_VERSION_1, Aix 4+
78 c_entries = 0 for Aix 4.3+
79 IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process.
80
81 We will still be confused if a Aix 4.3 64 bit core file is
82 copied over to a Aix 5 machine.
83
84 Check file header offsets
85
86 See rs6000-core.c for comment on size of core
87 If there isn't enough of a real core file, bail. */
88
89 if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1))
90 || (0 != core.c_entries)
91 || (! (IS_PROC64 (&core.c_u.U_proc)))
92 || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox)))
93 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader)))
94 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize)))
95 || ((CHECK_FILE_OFFSET (statbuf, core.c_thr)))
96 || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion)))
97 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack)))
98 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size)))
99 || ((CHECK_FILE_OFFSET (statbuf, core.c_data)))
100 || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize)))
101 || (! (core.c_flag & UBLOCK_VALID))
102 || (! (core.c_flag & LE_VALID)))
103 goto xcoff64_core_p_error;
104
105 /* Check for truncated stack or general truncating. */
106 if ((! (core.c_flag & USTACK_VALID))
107 || (core.c_flag & CORE_TRUNC))
108 {
109 bfd_set_error (bfd_error_file_truncated);
110
111 return NULL;
112 }
113
114 new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx));
115 if (NULL == new_core_hdr)
116 return NULL;
117
118 memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx));
119 /* The core_hdr() macro is no longer used here because it would
120 expand to code relying on gcc's cast-as-lvalue extension,
121 which was removed in gcc 4.0. */
122 abfd->tdata.any = new_core_hdr;
123
124 /* .stack section. */
125 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
126 sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags);
127 if (NULL == sec)
128 return NULL;
129
130 sec->size = core.c_size;
131 sec->vma = core.c_stackorg;
132 sec->filepos = core.c_stack;
133
134 /* .reg section for all registers. */
135 flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
136 sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
137 if (NULL == sec)
138 return NULL;
139
140 sec->size = sizeof (struct __context64);
141 sec->vma = 0;
142 sec->filepos = 0;
143 sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
144
145 if (core.c_extctx)
146 {
147 /* vmx section. */
148 flags = SEC_HAS_CONTENTS;
149 sec = bfd_make_section_anyway_with_flags (abfd, ".aix-vmx", flags);
150 if (sec == NULL)
151 return NULL;
152 sec->size = 560;
153 sec->vma = 0;
154 sec->filepos = core.c_extctx;
155
156 /* vmx section. */
157 flags = SEC_HAS_CONTENTS;
158 sec = bfd_make_section_anyway_with_flags (abfd, ".aix-vsx", flags);
159 if (sec == NULL)
160 return NULL;
161 sec->size = 256;
162 sec->vma = 0;
163 sec->filepos = core.c_extctx + 584;
164 }
165
166 /* .ldinfo section.
167 To actually find out how long this section is in this particular
168 core dump would require going down the whole list of struct
169 ld_info's. See if we can just fake it. */
170 flags = SEC_HAS_CONTENTS;
171 sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags);
172 if (NULL == sec)
173 return NULL;
174
175 sec->size = core.c_lsize;
176 sec->vma = 0;
177 sec->filepos = core.c_loader;
178
179 /* AIX 4 adds data sections from loaded objects to the core file,
180 which can be found by examining ldinfo, and anonymously mmapped
181 regions. */
182
183 /* .data section from executable. */
184 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
185 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
186 if (NULL == sec)
187 return NULL;
188
189 sec->size = core.c_datasize;
190 sec->vma = core.c_dataorg;
191 sec->filepos = core.c_data;
192
193 /* .data sections from loaded objects. */
194 ld_offset = core.c_loader;
195
196 while (1)
197 {
198 if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
199 return NULL;
200
201 if (sizeof (struct __ld_info64) !=
202 bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
203 return NULL;
204
205 if (ldinfo.ldinfo_core)
206 {
207 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
208 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
209 if (NULL == sec)
210 return NULL;
211
212 sec->size = ldinfo.ldinfo_datasize;
213 sec->vma = ldinfo.ldinfo_dataorg;
214 sec->filepos = ldinfo.ldinfo_core;
215 }
216
217 if (0 == ldinfo.ldinfo_next)
218 break;
219 ld_offset += ldinfo.ldinfo_next;
220 }
221
222 /* .vmdata sections from anonymously mmapped regions. */
223 if (core.c_vmregions)
224 {
225 if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
226 return NULL;
227
228 for (i = 0; i < core.c_vmregions; i++)
229 if (sizeof (struct vm_infox) !=
230 bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
231 return NULL;
232
233 if (vminfo.vminfo_offset)
234 {
235 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
236 sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags);
237 if (NULL == sec)
238 return NULL;
239
240 sec->size = vminfo.vminfo_size;
241 sec->vma = vminfo.vminfo_addr;
242 sec->filepos = vminfo.vminfo_offset;
243 }
244 }
245
246 /* Set the architecture and machine. */
247 arch = DEFAULT_ARCHITECTURE;
248 mach = DEFAULT_MACHINE;
249 bfd_default_set_arch_mach (abfd, arch, mach);
250
251 return _bfd_no_cleanup;
252
253 xcoff64_core_p_error:
254 if (bfd_get_error () != bfd_error_system_call)
255 bfd_set_error (bfd_error_wrong_format);
256
257 return NULL;
258 }
259
260 /* Return `TRUE' if given core is from the given executable. */
261
262 bool
263 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
264 {
265 struct core_dumpxx core;
266 char *path, *s;
267 size_t alloc;
268 const char *str1, *str2;
269 bool return_value = false;
270
271 /* Get the header. */
272 if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
273 return return_value;
274
275 if (sizeof (struct core_dumpxx) !=
276 bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
277 return return_value;
278
279 if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
280 return return_value;
281
282 alloc = 100;
283 path = bfd_malloc (alloc);
284 if (path == NULL)
285 return return_value;
286
287 s = path;
288
289 while (1)
290 {
291 if (bfd_bread (s, 1, core_bfd) != 1)
292 goto xcoff64_core_file_matches_executable_p_end_1;
293
294 if (*s == '\0')
295 break;
296 ++s;
297 if (s == path + alloc)
298 {
299 char *n;
300
301 alloc *= 2;
302 n = bfd_realloc (path, alloc);
303 if (n == NULL)
304 goto xcoff64_core_file_matches_executable_p_end_1;
305
306 s = n + (path - s);
307 path = n;
308 }
309 }
310
311 str1 = strrchr (path, '/');
312 str2 = strrchr (bfd_get_filename (exec_bfd), '/');
313
314 /* Step over character '/'. */
315 str1 = str1 != NULL ? str1 + 1 : path;
316 str2 = str2 != NULL ? str2 + 1 : bfd_get_filename (exec_bfd);
317
318 if (strcmp (str1, str2) == 0)
319 return_value = true;
320
321 xcoff64_core_file_matches_executable_p_end_1:
322 free (path);
323 return return_value;
324 }
325
326 char *
327 xcoff64_core_file_failing_command (bfd *abfd)
328 {
329 struct core_dumpxx *c = core_hdr (abfd);
330 char *return_value = 0;
331
332 if (NULL != c)
333 return_value = c->c_u.U_proc.pi_comm;
334
335 return return_value;
336 }
337
338 int
339 xcoff64_core_file_failing_signal (bfd *abfd)
340 {
341 struct core_dumpxx *c = core_hdr (abfd);
342 int return_value = 0;
343
344 if (NULL != c)
345 return_value = c->c_signo;
346
347 return return_value;
348 }
349
350 #else /* AIX_5_CORE */
351
352 bfd_cleanup
353 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
354 {
355 bfd_set_error (bfd_error_wrong_format);
356 return 0;
357 }
358
359 bool
360 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
361 {
362 return generic_core_file_matches_executable_p (core_bfd, exec_bfd);
363 }
364
365 char *
366 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
367 {
368 return 0;
369 }
370
371 int
372 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
373 {
374 return 0;
375 }
376
377 #endif /* AIX_5_CORE */