bfd/aix5ppc-core.c

   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
  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 *
  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
 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 *
 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
 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 *
 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
 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 *
 346 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 347 {
 348   return 0;
 349 }
 350
 351 int
 352 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 353 {
 354   return 0;
 355 }
 356
 357 #endif /* AIX_5_CORE */