1/* IBM RS/6000 "XCOFF" back-end for BFD.
2   Copyright (C) 2001-2017 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
26const bfd_target *xcoff64_core_p (bfd *);
27bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *);
28char *xcoff64_core_file_failing_command (bfd *);
29int 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
51const bfd_target *
52xcoff64_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
242bfd_boolean
243xcoff64_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
306char *
307xcoff64_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
318int
319xcoff64_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
332const bfd_target *
333xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
334{
335  bfd_set_error (bfd_error_wrong_format);
336  return 0;
337}
338
339bfd_boolean
340xcoff64_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
345char *
346xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
347{
348  return 0;
349}
350
351int
352xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
353{
354  return 0;
355}
356
357#endif /* AIX_5_CORE */
358