bfd/aix5ppc-core.c

   1 /* IBM RS/6000 "XCOFF" back-end for BFD.
   2    Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007
   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 3 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 "sysdep.h"
  25 #include "bfd.h"
  26
  27 const bfd_target *xcoff64_core_p (bfd *);
  28 bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *);
  29 char *xcoff64_core_file_failing_command (bfd *);
  30 int xcoff64_core_file_failing_signal (bfd *);
  31
  32 #ifdef AIX_5_CORE
  33
  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 *
  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   flagword flags;
  60
  61   /* Get the header.  */
  62   if (bfd_seek (abfd, 0, SEEK_SET) != 0)
  63     goto xcoff64_core_p_error;
  64
  65   if (sizeof (struct core_dumpxx)
  66       != bfd_bread (&core, sizeof (struct core_dumpxx), abfd))
  67     goto xcoff64_core_p_error;
  68
  69   if (bfd_stat (abfd, &statbuf) < 0)
  70     goto xcoff64_core_p_error;
  71
  72   /* Sanity checks
  73      c_flag has CORE_VERSION_1, Aix 4+
  74      c_entries = 0 for Aix 4.3+
  75      IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process.
  76
  77      We will still be confused if a Aix 4.3 64 bit core file is
  78      copied over to a Aix 5 machine.
  79
  80      Check file header offsets
  81
  82      See rs6000-core.c for comment on size of core
  83      If there isn't enough of a real core file, bail.  */
  84
  85   if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1))
  86       || (0 != core.c_entries)
  87       || (! (IS_PROC64 (&core.c_u.U_proc)))
  88       || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox)))
  89       || ((CHECK_FILE_OFFSET (statbuf, core.c_loader)))
  90       || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize)))
  91       || ((CHECK_FILE_OFFSET (statbuf, core.c_thr)))
  92       || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion)))
  93       || ((CHECK_FILE_OFFSET (statbuf, core.c_stack)))
  94       || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size)))
  95       || ((CHECK_FILE_OFFSET (statbuf, core.c_data)))
  96       || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize)))
  97       || (! (core.c_flag & UBLOCK_VALID))
  98       || (! (core.c_flag & LE_VALID)))
  99     goto xcoff64_core_p_error;
 100
 101   /* Check for truncated stack or general truncating.  */
 102   if ((! (core.c_flag & USTACK_VALID))
 103       || (core.c_flag & CORE_TRUNC))
 104     {
 105       bfd_set_error (bfd_error_file_truncated);
 106
 107       return return_value;
 108     }
 109
 110   new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx));
 111   if (NULL == new_core_hdr)
 112     return return_value;
 113
 114   memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx));
 115   /* The core_hdr() macro is no longer used here because it would
 116      expand to code relying on gcc's cast-as-lvalue extension,
 117      which was removed in gcc 4.0.  */
 118   abfd->tdata.any = new_core_hdr;
 119
 120   /* .stack section.  */
 121   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 122   sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags);
 123   if (NULL == sec)
 124     return return_value;
 125
 126   sec->size = core.c_size;
 127   sec->vma = core.c_stackorg;
 128   sec->filepos = core.c_stack;
 129
 130   /* .reg section for all registers.  */
 131   flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
 132   sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
 133   if (NULL == sec)
 134     return return_value;
 135
 136   sec->size = sizeof (struct __context64);
 137   sec->vma = 0;
 138   sec->filepos = 0;
 139   sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
 140
 141   /* .ldinfo section.
 142      To actually find out how long this section is in this particular
 143      core dump would require going down the whole list of struct
 144      ld_info's.   See if we can just fake it.  */
 145   flags = SEC_HAS_CONTENTS;
 146   sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags);
 147   if (NULL == sec)
 148     return return_value;
 149
 150   sec->size = core.c_lsize;
 151   sec->vma = 0;
 152   sec->filepos = core.c_loader;
 153
 154   /* AIX 4 adds data sections from loaded objects to the core file,
 155      which can be found by examining ldinfo, and anonymously mmapped
 156      regions.  */
 157
 158   /* .data section from executable.  */
 159   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 160   sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
 161   if (NULL == sec)
 162     return return_value;
 163
 164   sec->size = core.c_datasize;
 165   sec->vma = core.c_dataorg;
 166   sec->filepos = core.c_data;
 167
 168   /* .data sections from loaded objects.  */
 169   ld_offset = core.c_loader;
 170
 171   while (1)
 172     {
 173       if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
 174         return return_value;
 175
 176       if (sizeof (struct __ld_info64) !=
 177           bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
 178         return return_value;
 179
 180       if (ldinfo.ldinfo_core)
 181         {
 182           flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 183           sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
 184           if (NULL == sec)
 185             return return_value;
 186
 187           sec->size = ldinfo.ldinfo_datasize;
 188           sec->vma = ldinfo.ldinfo_dataorg;
 189           sec->filepos = ldinfo.ldinfo_core;
 190         }
 191
 192       if (0 == ldinfo.ldinfo_next)
 193         break;
 194       ld_offset += ldinfo.ldinfo_next;
 195     }
 196
 197   /* .vmdata sections from anonymously mmapped regions.  */
 198   if (core.c_vmregions)
 199     {
 200       if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
 201         return return_value;
 202
 203       for (i = 0; i < core.c_vmregions; i++)
 204         if (sizeof (struct vm_infox) !=
 205             bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
 206           return return_value;
 207
 208       if (vminfo.vminfo_offset)
 209         {
 210           flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 211           sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags);
 212           if (NULL == sec)
 213             return return_value;
 214
 215           sec->size = vminfo.vminfo_size;
 216           sec->vma = vminfo.vminfo_addr;
 217           sec->filepos = vminfo.vminfo_offset;
 218         }
 219     }
 220
 221   return_value = (bfd_target *) abfd->xvec;     /* This is garbage for now.  */
 222
 223  xcoff64_core_p_error:
 224   if (bfd_get_error () != bfd_error_system_call)
 225     bfd_set_error (bfd_error_wrong_format);
 226
 227   return return_value;
 228 }
 229
 230 /* Return `TRUE' if given core is from the given executable.  */
 231
 232 bfd_boolean
 233 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
 234 {
 235   struct core_dumpxx core;
 236   char *path, *s;
 237   size_t alloc;
 238   const char *str1, *str2;
 239   bfd_boolean return_value = FALSE;
 240
 241   /* Get the header.  */
 242   if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
 243     return return_value;
 244
 245   if (sizeof (struct core_dumpxx) !=
 246       bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
 247     return return_value;
 248
 249   if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
 250     return return_value;
 251
 252   alloc = 100;
 253   path = bfd_malloc (alloc);
 254   if (path == NULL)
 255     return return_value;
 256
 257   s = path;
 258
 259   while (1)
 260     {
 261       if (bfd_bread (s, 1, core_bfd) != 1)
 262         goto xcoff64_core_file_matches_executable_p_end_1;
 263
 264       if (*s == '\0')
 265         break;
 266       ++s;
 267       if (s == path + alloc)
 268         {
 269           char *n;
 270
 271           alloc *= 2;
 272           n = bfd_realloc (path, alloc);
 273           if (n == NULL)
 274             goto xcoff64_core_file_matches_executable_p_end_1;
 275
 276           s = n + (path - s);
 277           path = n;
 278         }
 279     }
 280
 281   str1 = strrchr (path, '/');
 282   str2 = strrchr (exec_bfd->filename, '/');
 283
 284   /* Step over character '/'.  */
 285   str1 = str1 != NULL ? str1 + 1 : path;
 286   str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
 287
 288   if (strcmp (str1, str2) == 0)
 289     return_value = TRUE;
 290
 291  xcoff64_core_file_matches_executable_p_end_1:
 292   free (path);
 293   return return_value;
 294 }
 295
 296 char *
 297 xcoff64_core_file_failing_command (bfd *abfd)
 298 {
 299   struct core_dumpxx *c = core_hdr (abfd);
 300   char *return_value = 0;
 301
 302   if (NULL != c)
 303     return_value = c->c_u.U_proc.pi_comm;
 304
 305   return return_value;
 306 }
 307
 308 int
 309 xcoff64_core_file_failing_signal (bfd *abfd)
 310 {
 311   struct core_dumpxx *c = core_hdr (abfd);
 312   int return_value = 0;
 313
 314   if (NULL != c)
 315     return_value = c->c_signo;
 316
 317   return return_value;
 318 }
 319
 320 #else /* AIX_5_CORE */
 321
 322 const bfd_target *
 323 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
 324 {
 325   bfd_set_error (bfd_error_wrong_format);
 326   return 0;
 327 }
 328
 329 bfd_boolean
 330 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
 331 {
 332   return generic_core_file_matches_executable_p (core_bfd, exec_bfd);
 333 }
 334
 335 char *
 336 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 337 {
 338   return 0;
 339 }
 340
 341 int
 342 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 343 {
 344   return 0;
 345 }
 346
 347 #endif /* AIX_5_CORE */