bfd/aix5ppc-core.c

   1 /* IBM RS/6000 "XCOFF" back-end for BFD.
   2    Copyright 2001, 2002
   3    Free Software Foundation, Inc.
   4    Written by Tom Rix
   5    Contributed by Redhat.
   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., 59 Temple Place - Suite 330, Boston,
  22    MA 02111-1307, 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
  32   PARAMS ((bfd *));
  33 bfd_boolean xcoff64_core_file_matches_executable_p
  34   PARAMS ((bfd *, bfd *));
  35 char *xcoff64_core_file_failing_command
  36   PARAMS ((bfd *));
  37 int xcoff64_core_file_failing_signal
  38   PARAMS ((bfd *));
  39
  40 /* Aix 5.1 system include file.  */
  41
  42 /* Need to define this macro so struct ld_info64 get included.  */
  43 #define __LDINFO_PTRACE64__
  44 #include <sys/ldr.h>
  45 #include <core.h>
  46
  47 #define core_hdr(abfd)          ((struct core_dumpxx *) abfd->tdata.any)
  48
  49 #define CHECK_FILE_OFFSET(s, v) \
  50   ((bfd_signed_vma)(v) < 0 || (bfd_signed_vma)(v) > (bfd_signed_vma)(s).st_size)
  51
  52 const bfd_target *
  53 xcoff64_core_p (abfd)
  54      bfd *abfd;
  55 {
  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   bfd_target *return_value = NULL;
  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 return_value;
 112     }
 113
 114   new_core_hdr = (struct core_dumpxx *)
 115     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   core_hdr(abfd) = (char *)new_core_hdr;
 121
 122   /* .stack section.  */
 123   sec = bfd_make_section_anyway (abfd, ".stack");
 124   if (NULL == sec)
 125     return return_value;
 126
 127   sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 128   sec->_raw_size = core.c_size;
 129   sec->vma = core.c_stackorg;
 130   sec->filepos = core.c_stack;
 131
 132   /* .reg section for all registers.  */
 133   sec = bfd_make_section_anyway (abfd, ".reg");
 134   if (NULL == sec)
 135     return return_value;
 136
 137   sec->flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
 138   sec->_raw_size = sizeof (struct __context64);
 139   sec->vma = 0;
 140   sec->filepos = 0;
 141   sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
 142
 143   /* .ldinfo section.
 144      To actually find out how long this section is in this particular
 145      core dump would require going down the whole list of struct
 146      ld_info's.   See if we can just fake it.  */
 147   sec = bfd_make_section_anyway (abfd, ".ldinfo");
 148   if (NULL == sec)
 149     return return_value;
 150
 151   sec->flags = SEC_HAS_CONTENTS;
 152   sec->_raw_size = core.c_lsize;
 153   sec->vma = 0;
 154   sec->filepos = core.c_loader;
 155
 156   /* AIX 4 adds data sections from loaded objects to the core file,
 157      which can be found by examining ldinfo, and anonymously mmapped
 158      regions.  */
 159
 160   /* .data section from executable.  */
 161   sec = bfd_make_section_anyway (abfd, ".data");
 162   if (NULL == sec)
 163     return return_value;
 164
 165   sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 166   sec->_raw_size = core.c_datasize;
 167   sec->vma = core.c_dataorg;
 168   sec->filepos = core.c_data;
 169
 170   /* .data sections from loaded objects.  */
 171   ld_offset = core.c_loader;
 172
 173   while (1)
 174     {
 175       if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
 176         return return_value;
 177
 178       if (sizeof (struct __ld_info64) !=
 179           bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
 180         return return_value;
 181
 182       if (ldinfo.ldinfo_core)
 183         {
 184           sec = bfd_make_section_anyway (abfd, ".data");
 185           if (NULL == sec)
 186             return return_value;
 187
 188           sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 189           sec->_raw_size = ldinfo.ldinfo_datasize;
 190           sec->vma = ldinfo.ldinfo_dataorg;
 191           sec->filepos = ldinfo.ldinfo_core;
 192         }
 193
 194       if (0 == ldinfo.ldinfo_next)
 195         break;
 196       ld_offset += ldinfo.ldinfo_next;
 197     }
 198
 199   /* .vmdata sections from anonymously mmapped regions.  */
 200   if (core.c_vmregions)
 201     {
 202       if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
 203         return return_value;
 204
 205       for (i = 0; i < core.c_vmregions; i++)
 206         if (sizeof (struct vm_infox) !=
 207             bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
 208           return return_value;
 209
 210       if (vminfo.vminfo_offset)
 211         {
 212           sec = bfd_make_section_anyway (abfd, ".vmdata");
 213           if (NULL == sec)
 214             return return_value;
 215
 216           sec->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 217           sec->_raw_size = vminfo.vminfo_size;
 218           sec->vma = vminfo.vminfo_addr;
 219           sec->filepos = vminfo.vminfo_offset;
 220         }
 221     }
 222
 223   return_value = abfd->xvec;    /* This is garbage for now.  */
 224
 225  xcoff64_core_p_error:
 226   if (bfd_get_error () != bfd_error_system_call)
 227     bfd_set_error (bfd_error_wrong_format);
 228
 229   return return_value;
 230 }
 231
 232 /* Return `TRUE' if given core is from the given executable.  */
 233
 234 bfd_boolean
 235 xcoff64_core_file_matches_executable_p (core_bfd, exec_bfd)
 236      bfd *core_bfd;
 237      bfd *exec_bfd;
 238 {
 239   struct core_dumpxx core;
 240   char *path, *s;
 241   size_t alloc;
 242   const char *str1, *str2;
 243   bfd_boolean return_value = FALSE;
 244
 245   /* Get the header.  */
 246   if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
 247     return return_value;
 248
 249   if (sizeof (struct core_dumpxx) !=
 250       bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
 251     return return_value;
 252
 253   if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
 254     return return_value;
 255
 256   alloc = 100;
 257   path = bfd_malloc (alloc);
 258   if (path == NULL)
 259     return return_value;
 260
 261   s = path;
 262
 263   while (1)
 264     {
 265       if (bfd_bread (s, 1, core_bfd) != 1)
 266         goto xcoff64_core_file_matches_executable_p_end_1;
 267
 268       if (*s == '\0')
 269         break;
 270       ++s;
 271       if (s == path + alloc)
 272         {
 273           char *n;
 274
 275           alloc *= 2;
 276           n = bfd_realloc (path, alloc);
 277           if (n == NULL)
 278             goto xcoff64_core_file_matches_executable_p_end_1;
 279
 280           s = n + (path - s);
 281           path = n;
 282         }
 283     }
 284
 285   str1 = strrchr (path, '/');
 286   str2 = strrchr (exec_bfd->filename, '/');
 287
 288   /* Step over character '/'.  */
 289   str1 = str1 != NULL ? str1 + 1 : path;
 290   str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
 291
 292   if (strcmp (str1, str2) == 0)
 293     return_value = TRUE;
 294
 295  xcoff64_core_file_matches_executable_p_end_1:
 296   free (path);
 297   return return_value;
 298 }
 299
 300 char *
 301 xcoff64_core_file_failing_command (abfd)
 302      bfd *abfd;
 303 {
 304   struct core_dumpxx *c = core_hdr (abfd);
 305   char *return_value = 0;
 306
 307   if (NULL != c)
 308     return_value = c->c_u.U_proc.pi_comm;
 309
 310   return return_value;
 311 }
 312
 313 int
 314 xcoff64_core_file_failing_signal (abfd)
 315      bfd *abfd;
 316 {
 317   struct core_dumpxx *c = core_hdr (abfd);
 318   int return_value = 0;
 319
 320   if (NULL != c)
 321     return_value = c->c_signo;
 322
 323   return return_value;
 324 }
 325
 326 #else /* AIX_5_CORE */
 327
 328 const bfd_target *xcoff64_core_p
 329   PARAMS ((bfd *));
 330 bfd_boolean xcoff64_core_file_matches_executable_p
 331   PARAMS ((bfd *, bfd *));
 332 char *xcoff64_core_file_failing_command
 333   PARAMS ((bfd *));
 334 int xcoff64_core_file_failing_signal
 335   PARAMS ((bfd *));
 336
 337 const bfd_target *
 338 xcoff64_core_p (abfd)
 339      bfd *abfd ATTRIBUTE_UNUSED;
 340 {
 341   bfd_set_error (bfd_error_wrong_format);
 342   return 0;
 343 }
 344
 345 bfd_boolean
 346 xcoff64_core_file_matches_executable_p (core_bfd, exec_bfd)
 347      bfd *core_bfd ATTRIBUTE_UNUSED;
 348      bfd *exec_bfd ATTRIBUTE_UNUSED;
 349 {
 350   return FALSE;
 351 }
 352
 353 char *
 354 xcoff64_core_file_failing_command (abfd)
 355      bfd *abfd ATTRIBUTE_UNUSED;
 356 {
 357   return 0;
 358 }
 359
 360 int
 361 xcoff64_core_file_failing_signal (abfd)
 362      bfd *abfd ATTRIBUTE_UNUSED;
 363 {
 364   return 0;
 365 }
 366
 367 #endif /* AIX_5_CORE */