bfd/aix5ppc-core.c

   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 #ifdef AIX_5_CORE
  27
  28 #include "sysdep.h"
  29 #include "libbfd.h"
  30
  31 const bfd_target *xcoff64_core_p (bfd *);
  32 bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *);
  33 char *xcoff64_core_file_failing_command (bfd *);
  34 int xcoff64_core_file_failing_signal (bfd *);
  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
  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
 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 *
 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
 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 *);
 322 bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *);
 323 char *xcoff64_core_file_failing_command (bfd *);
 324 int xcoff64_core_file_failing_signal (bfd *);
 325
 326 const bfd_target *
 327 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
 328 {
 329   bfd_set_error (bfd_error_wrong_format);
 330   return 0;
 331 }
 332
 333 bfd_boolean
 334 xcoff64_core_file_matches_executable_p (bfd *core_bfd ATTRIBUTE_UNUSED,
 335                                         bfd *exec_bfd ATTRIBUTE_UNUSED)
 336 {
 337   return FALSE;
 338 }
 339
 340 char *
 341 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 342 {
 343   return 0;
 344 }
 345
 346 int
 347 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 348 {
 349   return 0;
 350 }
 351
 352 #endif /* AIX_5_CORE */