bfd/aix5ppc-core.c

   1 /* IBM RS/6000 "XCOFF" back-end for BFD.
   2    Copyright (C) 2001-2022 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 bfd_cleanup xcoff64_core_p (bfd *);
  27 bool 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 bfd_cleanup
  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   flagword flags;
  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 NULL;
 112     }
 113
 114   new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx));
 115   if (NULL == new_core_hdr)
 116     return NULL;
 117
 118   memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx));
 119   /* The core_hdr() macro is no longer used here because it would
 120      expand to code relying on gcc's cast-as-lvalue extension,
 121      which was removed in gcc 4.0.  */
 122   abfd->tdata.any = new_core_hdr;
 123
 124   /* .stack section.  */
 125   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 126   sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags);
 127   if (NULL == sec)
 128     return NULL;
 129
 130   sec->size = core.c_size;
 131   sec->vma = core.c_stackorg;
 132   sec->filepos = core.c_stack;
 133
 134   /* .reg section for all registers.  */
 135   flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
 136   sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
 137   if (NULL == sec)
 138     return NULL;
 139
 140   sec->size = sizeof (struct __context64);
 141   sec->vma = 0;
 142   sec->filepos = 0;
 143   sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64;
 144
 145   /* .ldinfo section.
 146      To actually find out how long this section is in this particular
 147      core dump would require going down the whole list of struct
 148      ld_info's.   See if we can just fake it.  */
 149   flags = SEC_HAS_CONTENTS;
 150   sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags);
 151   if (NULL == sec)
 152     return NULL;
 153
 154   sec->size = core.c_lsize;
 155   sec->vma = 0;
 156   sec->filepos = core.c_loader;
 157
 158   /* AIX 4 adds data sections from loaded objects to the core file,
 159      which can be found by examining ldinfo, and anonymously mmapped
 160      regions.  */
 161
 162   /* .data section from executable.  */
 163   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 164   sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
 165   if (NULL == sec)
 166     return NULL;
 167
 168   sec->size = core.c_datasize;
 169   sec->vma = core.c_dataorg;
 170   sec->filepos = core.c_data;
 171
 172   /* .data sections from loaded objects.  */
 173   ld_offset = core.c_loader;
 174
 175   while (1)
 176     {
 177       if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0)
 178         return NULL;
 179
 180       if (sizeof (struct __ld_info64) !=
 181           bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd))
 182         return NULL;
 183
 184       if (ldinfo.ldinfo_core)
 185         {
 186           flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 187           sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
 188           if (NULL == sec)
 189             return NULL;
 190
 191           sec->size = ldinfo.ldinfo_datasize;
 192           sec->vma = ldinfo.ldinfo_dataorg;
 193           sec->filepos = ldinfo.ldinfo_core;
 194         }
 195
 196       if (0 == ldinfo.ldinfo_next)
 197         break;
 198       ld_offset += ldinfo.ldinfo_next;
 199     }
 200
 201   /* .vmdata sections from anonymously mmapped regions.  */
 202   if (core.c_vmregions)
 203     {
 204       if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0)
 205         return NULL;
 206
 207       for (i = 0; i < core.c_vmregions; i++)
 208         if (sizeof (struct vm_infox) !=
 209             bfd_bread (&vminfo, sizeof (struct vm_infox), abfd))
 210           return NULL;
 211
 212       if (vminfo.vminfo_offset)
 213         {
 214           flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 215           sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags);
 216           if (NULL == sec)
 217             return NULL;
 218
 219           sec->size = vminfo.vminfo_size;
 220           sec->vma = vminfo.vminfo_addr;
 221           sec->filepos = vminfo.vminfo_offset;
 222         }
 223     }
 224
 225   /* Set the architecture and machine.  */
 226   arch = DEFAULT_ARCHITECTURE;
 227   mach = DEFAULT_MACHINE;
 228   bfd_default_set_arch_mach (abfd, arch, mach);
 229
 230   return _bfd_no_cleanup;
 231
 232  xcoff64_core_p_error:
 233   if (bfd_get_error () != bfd_error_system_call)
 234     bfd_set_error (bfd_error_wrong_format);
 235
 236   return NULL;
 237 }
 238
 239 /* Return `TRUE' if given core is from the given executable.  */
 240
 241 bool
 242 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
 243 {
 244   struct core_dumpxx core;
 245   char *path, *s;
 246   size_t alloc;
 247   const char *str1, *str2;
 248   bool return_value = false;
 249
 250   /* Get the header.  */
 251   if (bfd_seek (core_bfd, 0, SEEK_SET) != 0)
 252     return return_value;
 253
 254   if (sizeof (struct core_dumpxx) !=
 255       bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd))
 256     return return_value;
 257
 258   if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0)
 259     return return_value;
 260
 261   alloc = 100;
 262   path = bfd_malloc (alloc);
 263   if (path == NULL)
 264     return return_value;
 265
 266   s = path;
 267
 268   while (1)
 269     {
 270       if (bfd_bread (s, 1, core_bfd) != 1)
 271         goto xcoff64_core_file_matches_executable_p_end_1;
 272
 273       if (*s == '\0')
 274         break;
 275       ++s;
 276       if (s == path + alloc)
 277         {
 278           char *n;
 279
 280           alloc *= 2;
 281           n = bfd_realloc (path, alloc);
 282           if (n == NULL)
 283             goto xcoff64_core_file_matches_executable_p_end_1;
 284
 285           s = n + (path - s);
 286           path = n;
 287         }
 288     }
 289
 290   str1 = strrchr (path, '/');
 291   str2 = strrchr (bfd_get_filename (exec_bfd), '/');
 292
 293   /* Step over character '/'.  */
 294   str1 = str1 != NULL ? str1 + 1 : path;
 295   str2 = str2 != NULL ? str2 + 1 : bfd_get_filename (exec_bfd);
 296
 297   if (strcmp (str1, str2) == 0)
 298     return_value = true;
 299
 300  xcoff64_core_file_matches_executable_p_end_1:
 301   free (path);
 302   return return_value;
 303 }
 304
 305 char *
 306 xcoff64_core_file_failing_command (bfd *abfd)
 307 {
 308   struct core_dumpxx *c = core_hdr (abfd);
 309   char *return_value = 0;
 310
 311   if (NULL != c)
 312     return_value = c->c_u.U_proc.pi_comm;
 313
 314   return return_value;
 315 }
 316
 317 int
 318 xcoff64_core_file_failing_signal (bfd *abfd)
 319 {
 320   struct core_dumpxx *c = core_hdr (abfd);
 321   int return_value = 0;
 322
 323   if (NULL != c)
 324     return_value = c->c_signo;
 325
 326   return return_value;
 327 }
 328
 329 #else /* AIX_5_CORE */
 330
 331 bfd_cleanup
 332 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED)
 333 {
 334   bfd_set_error (bfd_error_wrong_format);
 335   return 0;
 336 }
 337
 338 bool
 339 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
 340 {
 341   return generic_core_file_matches_executable_p (core_bfd, exec_bfd);
 342 }
 343
 344 char *
 345 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 346 {
 347   return 0;
 348 }
 349
 350 int
 351 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 352 {
 353   return 0;
 354 }
 355
 356 #endif /* AIX_5_CORE */