1 /* IBM RS/6000 "XCOFF" back-end for BFD.
2 Copyright (C) 2001-2016 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 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 "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 const bfd_target *
xcoff64_core_p(bfd * abfd)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 const bfd_target *return_value = NULL;
64 flagword flags;
65
66 /* Get the header. */
67 if (bfd_seek (abfd, 0, SEEK_SET) != 0)
68 goto xcoff64_core_p_error;
69
70 if (sizeof (struct core_dumpxx)
71 != bfd_bread (&core, sizeof (struct core_dumpxx), abfd))
72 goto xcoff64_core_p_error;
73
74 if (bfd_stat (abfd, &statbuf) < 0)
75 goto xcoff64_core_p_error;
76
77 /* Sanity checks
78 c_flag has CORE_VERSION_1, Aix 4+
79 c_entries = 0 for Aix 4.3+
80 IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process.
81
82 We will still be confused if a Aix 4.3 64 bit core file is
83 copied over to a Aix 5 machine.
84
85 Check file header offsets
86
87 See rs6000-core.c for comment on size of core
88 If there isn't enough of a real core file, bail. */
89
90 if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1))
91 || (0 != core.c_entries)
92 || (! (IS_PROC64 (&core.c_u.U_proc)))
93 || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox)))
94 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader)))
95 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize)))
96 || ((CHECK_FILE_OFFSET (statbuf, core.c_thr)))
97 || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion)))
98 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack)))
99 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size)))
100 || ((CHECK_FILE_OFFSET (statbuf, core.c_data)))
101 || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize)))
102 || (! (core.c_flag & UBLOCK_VALID))
103 || (! (core.c_flag & LE_VALID)))
104 goto xcoff64_core_p_error;
105
106 /* Check for truncated stack or general truncating. */
107 if ((! (core.c_flag & USTACK_VALID))
108 || (core.c_flag & CORE_TRUNC))
109 {
110 bfd_set_error (bfd_error_file_truncated);
111
112 return return_value;
113 }
114
115 new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx));
116 if (NULL == new_core_hdr)
117 return return_value;
118
119 memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx));
120 /* The core_hdr() macro is no longer used here because it would
121 expand to code relying on gcc's cast-as-lvalue extension,
122 which was removed in gcc 4.0. */
123 abfd->tdata.any = new_core_hdr;
124
125 /* .stack section. */
126 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
127 sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags);
128 if (NULL == sec)
129 return return_value;
130
131 sec->size = core.c_size;
132 sec->vma = core.c_stackorg;
133 sec->filepos = core.c_stack;
134
135 /* .reg section for all registers. */
136 flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
137 sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
138 if (NULL == sec)
139 return return_value;
140
141 sec->size = sizeof (struct __context64);
142 sec->vma = 0;
143 sec->filepos = 0;
144 sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
145
146 /* .ldinfo section.
147 To actually find out how long this section is in this particular
148 core dump would require going down the whole list of struct
149 ld_info's. See if we can just fake it. */
150 flags = SEC_HAS_CONTENTS;
151 sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags);
152 if (NULL == sec)
153 return return_value;
154
155 sec->size = core.c_lsize;
156 sec->vma = 0;
157 sec->filepos = core.c_loader;
158
159 /* AIX 4 adds data sections from loaded objects to the core file,
160 which can be found by examining ldinfo, and anonymously mmapped
161 regions. */
162
163 /* .data section from executable. */
164 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
165 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
166 if (NULL == sec)
167 return return_value;
168
169 sec->size = core.c_datasize;
170 sec->vma = core.c_dataorg;
171 sec->filepos = core.c_data;
172
173 /* .data sections from loaded objects. */
174 ld_offset = core.c_loader;
175
176 while (1)
177 {
178 if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
179 return return_value;
180
181 if (sizeof (struct __ld_info64) !=
182 bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
183 return return_value;
184
185 if (ldinfo.ldinfo_core)
186 {
187 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
188 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
189 if (NULL == sec)
190 return return_value;
191
192 sec->size = ldinfo.ldinfo_datasize;
193 sec->vma = ldinfo.ldinfo_dataorg;
194 sec->filepos = ldinfo.ldinfo_core;
195 }
196
197 if (0 == ldinfo.ldinfo_next)
198 break;
199 ld_offset += ldinfo.ldinfo_next;
200 }
201
202 /* .vmdata sections from anonymously mmapped regions. */
203 if (core.c_vmregions)
204 {
205 if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
206 return return_value;
207
208 for (i = 0; i < core.c_vmregions; i++)
209 if (sizeof (struct vm_infox) !=
210 bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
211 return return_value;
212
213 if (vminfo.vminfo_offset)
214 {
215 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
216 sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags);
217 if (NULL == sec)
218 return return_value;
219
220 sec->size = vminfo.vminfo_size;
221 sec->vma = vminfo.vminfo_addr;
222 sec->filepos = vminfo.vminfo_offset;
223 }
224 }
225
226 /* Set the architecture and machine. */
227 arch = DEFAULT_ARCHITECTURE;
228 mach = DEFAULT_MACHINE;
229 bfd_default_set_arch_mach (abfd, arch, mach);
230
231 return_value = (bfd_target *) abfd->xvec; /* This is garbage for now. */
232
233 xcoff64_core_p_error:
234 if (bfd_get_error () != bfd_error_system_call)
235 bfd_set_error (bfd_error_wrong_format);
236
237 return return_value;
238 }
239
240 /* Return `TRUE' if given core is from the given executable. */
241
242 bfd_boolean
xcoff64_core_file_matches_executable_p(bfd * core_bfd,bfd * exec_bfd)243 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
244 {
245 struct core_dumpxx core;
246 char *path, *s;
247 size_t alloc;
248 const char *str1, *str2;
249 bfd_boolean return_value = FALSE;
250
251 /* Get the header. */
252 if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
253 return return_value;
254
255 if (sizeof (struct core_dumpxx) !=
256 bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
257 return return_value;
258
259 if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
260 return return_value;
261
262 alloc = 100;
263 path = bfd_malloc (alloc);
264 if (path == NULL)
265 return return_value;
266
267 s = path;
268
269 while (1)
270 {
271 if (bfd_bread (s, 1, core_bfd) != 1)
272 goto xcoff64_core_file_matches_executable_p_end_1;
273
274 if (*s == '\0')
275 break;
276 ++s;
277 if (s == path + alloc)
278 {
279 char *n;
280
281 alloc *= 2;
282 n = bfd_realloc (path, alloc);
283 if (n == NULL)
284 goto xcoff64_core_file_matches_executable_p_end_1;
285
286 s = n + (path - s);
287 path = n;
288 }
289 }
290
291 str1 = strrchr (path, '/');
292 str2 = strrchr (exec_bfd->filename, '/');
293
294 /* Step over character '/'. */
295 str1 = str1 != NULL ? str1 + 1 : path;
296 str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
297
298 if (strcmp (str1, str2) == 0)
299 return_value = TRUE;
300
301 xcoff64_core_file_matches_executable_p_end_1:
302 free (path);
303 return return_value;
304 }
305
306 char *
xcoff64_core_file_failing_command(bfd * abfd)307 xcoff64_core_file_failing_command (bfd *abfd)
308 {
309 struct core_dumpxx *c = core_hdr (abfd);
310 char *return_value = 0;
311
312 if (NULL != c)
313 return_value = c->c_u.U_proc.pi_comm;
314
315 return return_value;
316 }
317
318 int
xcoff64_core_file_failing_signal(bfd * abfd)319 xcoff64_core_file_failing_signal (bfd *abfd)
320 {
321 struct core_dumpxx *c = core_hdr (abfd);
322 int return_value = 0;
323
324 if (NULL != c)
325 return_value = c->c_signo;
326
327 return return_value;
328 }
329
330 #else /* AIX_5_CORE */
331
332 const bfd_target *
xcoff64_core_p(bfd * abfd ATTRIBUTE_UNUSED)333 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
334 {
335 bfd_set_error (bfd_error_wrong_format);
336 return 0;
337 }
338
339 bfd_boolean
xcoff64_core_file_matches_executable_p(bfd * core_bfd,bfd * exec_bfd)340 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
341 {
342 return generic_core_file_matches_executable_p (core_bfd, exec_bfd);
343 }
344
345 char *
xcoff64_core_file_failing_command(bfd * abfd ATTRIBUTE_UNUSED)346 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
347 {
348 return 0;
349 }
350
351 int
xcoff64_core_file_failing_signal(bfd * abfd ATTRIBUTE_UNUSED)352 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
353 {
354 return 0;
355 }
356
357 #endif /* AIX_5_CORE */
358