bfd/rs6000-core.c

   1 /* IBM RS/6000 "XCOFF" back-end for BFD.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
   3    2001, 2002, 2004, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5    Written by Metin G. Ozisik, Mimi Phuong-Thao Vo, and John Gilmore.
   6    Archive support from Damon A. Permezel.
   7    Contributed by IBM Corporation and Cygnus Support.
   8
   9    This file is part of BFD, the Binary File Descriptor library.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  24    MA 02110-1301, USA.  */
  25
  26
  27 /* This port currently only handles reading object files, except when
  28    compiled on an RS/6000 host.  -- no archive support, no core files.
  29    In all cases, it does not support writing.
  30
  31    This is in a separate file from coff-rs6000.c, because it includes
  32    system include files that conflict with coff/rs6000.h.  */
  33
  34 /* Internalcoff.h and coffcode.h modify themselves based on this flag.  */
  35 #define RS6000COFF_C 1
  36
  37 /* The AIX 4.1 kernel is obviously compiled with -D_LONG_LONG, so
  38    we have to define _LONG_LONG for older versions of gcc to get the
  39    proper alignments in the user structure.  */
  40 #if defined(_AIX41) && !defined(_LONG_LONG)
  41 #define _LONG_LONG
  42 #endif
  43
  44 #include "sysdep.h"
  45 #include "bfd.h"
  46 #include "libbfd.h"
  47
  48 #ifdef AIX_CORE
  49
  50 /* AOUTHDR is defined by the above.  We need another defn of it, from the
  51    system include files.  Punt the old one and get us a new name for the
  52    typedef in the system include files.  */
  53 #ifdef AOUTHDR
  54 #undef AOUTHDR
  55 #endif
  56 #define AOUTHDR second_AOUTHDR
  57
  58 #undef  SCNHDR
  59
  60 /* ------------------------------------------------------------------------ */
  61 /*      Support for core file stuff..                                       */
  62 /* ------------------------------------------------------------------------ */
  63
  64 #include <sys/user.h>
  65 #define __LDINFO_PTRACE32__     /* for __ld_info32 */
  66 #define __LDINFO_PTRACE64__     /* for __ld_info64 */
  67 #include <sys/ldr.h>
  68 #include <sys/core.h>
  69 #include <sys/systemcfg.h>
  70
  71 /* Borrowed from <sys/inttypes.h> on recent AIX versions.  */
  72 typedef unsigned long ptr_to_uint;
  73
  74 #define core_hdr(bfd)           ((CoreHdr *) bfd->tdata.any)
  75
  76 /* AIX 4.1 changed the names and locations of a few items in the core file.
  77    AIX 4.3 defined an entirely new structure, core_dumpx, but kept support for
  78    the previous 4.1 structure, core_dump.
  79
  80    AIX_CORE_DUMPX_CORE is defined (by configure) on AIX 4.3+, and
  81    CORE_VERSION_1 is defined (by AIX core.h) as 2 on AIX 4.3+ and as 1 on AIX
  82    4.1 and 4.2.  AIX pre-4.1 (aka 3.x) either doesn't define CORE_VERSION_1
  83    or else defines it as 0.  */
  84
  85 #if defined(CORE_VERSION_1) && !CORE_VERSION_1
  86 # undef CORE_VERSION_1
  87 #endif
  88
  89 /* The following union and macros allow this module to compile on all AIX
  90    versions and to handle both core_dumpx and core_dump on 4.3+.  CNEW_*()
  91    and COLD_*() macros respectively retrieve core_dumpx and core_dump
  92    values.  */
  93
  94 /* Union of 32-bit and 64-bit versions of ld_info.  */
  95
  96 typedef union {
  97 #ifdef __ld_info32
  98   struct __ld_info32 l32;
  99   struct __ld_info64 l64;
 100 #else
 101   struct ld_info l32;
 102   struct ld_info l64;
 103 #endif
 104 } LdInfo;
 105
 106 /* Union of old and new core dump structures.  */
 107
 108 typedef union {
 109 #ifdef AIX_CORE_DUMPX_CORE
 110   struct core_dumpx new;        /* new AIX 4.3+ core dump */
 111 #else
 112   struct core_dump new;         /* for simpler coding */
 113 #endif
 114   struct core_dump old;         /* old AIX 4.2- core dump, still used on
 115                                    4.3+ with appropriate SMIT config */
 116 } CoreHdr;
 117
 118 /* Union of old and new vm_info structures.  */
 119
 120 #ifdef CORE_VERSION_1
 121 typedef union {
 122 #ifdef AIX_CORE_DUMPX_CORE
 123   struct vm_infox new;
 124 #else
 125   struct vm_info new;
 126 #endif
 127   struct vm_info old;
 128 } VmInfo;
 129 #endif
 130
 131 /* Return whether CoreHdr C is in new or old format.  */
 132
 133 #ifdef AIX_CORE_DUMPX_CORE
 134 # define CORE_NEW(c)    (!(c).old.c_entries)
 135 #else
 136 # define CORE_NEW(c)    0
 137 #endif
 138
 139 /* Return whether CoreHdr C usese core_dumpxx structure.
 140
 141    FIXME: the core file format version number used here definitely indicates
 142    that struct core_dumpxx should be used to represent the core file header,
 143    but that may not be the only such format version number.  */
 144
 145 #ifdef AIX_5_CORE
 146 # define CORE_DUMPXX_VERSION    267312562
 147 # define CNEW_IS_CORE_DUMPXX(c) ((c).new.c_version == CORE_DUMPXX_VERSION)
 148 #else
 149 # define CNEW_IS_CORE_DUMPXX(c) 0
 150 #endif
 151
 152 /* Return the c_stackorg field from struct core_dumpx C.  */
 153
 154 #ifdef AIX_CORE_DUMPX_CORE
 155 # define CNEW_STACKORG(c)       (c).c_stackorg
 156 #else
 157 # define CNEW_STACKORG(c)       0
 158 #endif
 159
 160 /* Return the offset to the loader region from struct core_dump C.  */
 161
 162 #ifdef AIX_CORE_DUMPX_CORE
 163 # define CNEW_LOADER(c) (c).c_loader
 164 #else
 165 # define CNEW_LOADER(c) 0
 166 #endif
 167
 168 /* Return the offset to the loader region from struct core_dump C.  */
 169
 170 #define COLD_LOADER(c)  (c).c_tab
 171
 172 /* Return the c_lsize field from struct core_dumpx C.  */
 173
 174 #ifdef AIX_CORE_DUMPX_CORE
 175 # define CNEW_LSIZE(c)  (c).c_lsize
 176 #else
 177 # define CNEW_LSIZE(c)  0
 178 #endif
 179
 180 /* Return the c_dataorg field from struct core_dumpx C.  */
 181
 182 #ifdef AIX_CORE_DUMPX_CORE
 183 # define CNEW_DATAORG(c)        (c).c_dataorg
 184 #else
 185 # define CNEW_DATAORG(c)        0
 186 #endif
 187
 188 /* Return the c_datasize field from struct core_dumpx C.  */
 189
 190 #ifdef AIX_CORE_DUMPX_CORE
 191 # define CNEW_DATASIZE(c)       (c).c_datasize
 192 #else
 193 # define CNEW_DATASIZE(c)       0
 194 #endif
 195
 196 /* Return the c_impl field from struct core_dumpx C.  */
 197
 198 #if defined (HAVE_ST_C_IMPL) || defined (AIX_5_CORE)
 199 # define CNEW_IMPL(c)   (c).c_impl
 200 #else
 201 # define CNEW_IMPL(c)   0
 202 #endif
 203
 204 /* Return the command string from struct core_dumpx C.  */
 205
 206 #ifdef AIX_CORE_DUMPX_CORE
 207 # define CNEW_COMM(c)   (c).c_u.U_proc.pi_comm
 208 #else
 209 # define CNEW_COMM(c)   0
 210 #endif
 211
 212 /* Return the command string from struct core_dump C.  */
 213
 214 #ifdef CORE_VERSION_1
 215 # define COLD_COMM(c)   (c).c_u.U_comm
 216 #else
 217 # define COLD_COMM(c)   (c).c_u.u_comm
 218 #endif
 219
 220 /* Return the struct __context64 pointer from struct core_dumpx C.  */
 221
 222 #ifdef AIX_CORE_DUMPX_CORE
 223 # define CNEW_CONTEXT64(c)      (c).c_flt.hctx.r64
 224 #else
 225 # define CNEW_CONTEXT64(c)      c
 226 #endif
 227
 228 /* Return the struct mstsave pointer from struct core_dumpx C.  */
 229
 230 #ifdef AIX_CORE_DUMPX_CORE
 231 # define CNEW_MSTSAVE(c)        (c).c_flt.hctx.r32
 232 #else
 233 # define CNEW_MSTSAVE(c)        c
 234 #endif
 235
 236 /* Return the struct mstsave pointer from struct core_dump C.  */
 237
 238 #ifdef CORE_VERSION_1
 239 # define COLD_MSTSAVE(c)        (c).c_mst
 240 #else
 241 # define COLD_MSTSAVE(c)        (c).c_u.u_save
 242 #endif
 243
 244 /* Return whether struct core_dumpx is from a 64-bit process.  */
 245
 246 #ifdef AIX_CORE_DUMPX_CORE
 247 # define CNEW_PROC64(c)         IS_PROC64(&(c).c_u.U_proc)
 248 #else
 249 # define CNEW_PROC64(c)         0
 250 #endif
 251
 252 /* Magic end-of-stack addresses for old core dumps.  This is _very_ fragile,
 253    but I don't see any easy way to get that info right now.  */
 254
 255 #ifdef CORE_VERSION_1
 256 # define COLD_STACKEND  0x2ff23000
 257 #else
 258 # define COLD_STACKEND  0x2ff80000
 259 #endif
 260
 261 /* Size of the leading portion that old and new core dump structures have in
 262    common.  */
 263 #define CORE_COMMONSZ   ((int) &((struct core_dump *) 0)->c_entries \
 264                          + sizeof (((struct core_dump *) 0)->c_entries))
 265
 266 /* Define prototypes for certain functions, to avoid a compiler warning
 267    saying that they are missing.  */
 268
 269 const bfd_target * rs6000coff_core_p (bfd *abfd);
 270 bfd_boolean rs6000coff_core_file_matches_executable_p (bfd *core_bfd,
 271                                                        bfd *exec_bfd);
 272 char * rs6000coff_core_file_failing_command (bfd *abfd);
 273 int rs6000coff_core_file_failing_signal (bfd *abfd);
 274
 275 /* Try to read into CORE the header from the core file associated with ABFD.
 276    Return success.  */
 277
 278 static bfd_boolean
 279 read_hdr (bfd *abfd, CoreHdr *core)
 280 {
 281   bfd_size_type size;
 282
 283   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 284     return FALSE;
 285
 286   /* Read the leading portion that old and new core dump structures have in
 287      common.  */
 288   size = CORE_COMMONSZ;
 289   if (bfd_bread (core, size, abfd) != size)
 290     return FALSE;
 291
 292   /* Read the trailing portion of the structure.  */
 293   if (CORE_NEW (*core))
 294     size = sizeof (core->new);
 295   else
 296     size = sizeof (core->old);
 297   size -= CORE_COMMONSZ;
 298   return bfd_bread ((char *) core + CORE_COMMONSZ, size, abfd) == size;
 299 }
 300
 301 static asection *
 302 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
 303                    bfd_size_type size, bfd_vma vma, file_ptr filepos)
 304 {
 305   asection *asect;
 306
 307   asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
 308   if (!asect)
 309     return NULL;
 310
 311   asect->size = size;
 312   asect->vma = vma;
 313   asect->filepos = filepos;
 314   asect->alignment_power = 8;
 315
 316   return asect;
 317 }
 318
 319 /* Decide if a given bfd represents a `core' file or not. There really is no
 320    magic number or anything like, in rs6000coff.  */
 321
 322 const bfd_target *
 323 rs6000coff_core_p (bfd *abfd)
 324 {
 325   CoreHdr core;
 326   struct stat statbuf;
 327   bfd_size_type size;
 328   char *tmpptr;
 329
 330   /* Values from new and old core structures.  */
 331   int c_flag;
 332   file_ptr c_stack, c_regoff, c_loader;
 333   bfd_size_type c_size, c_regsize, c_lsize;
 334   bfd_vma c_stackend;
 335   void *c_regptr;
 336   int proc64;
 337
 338   if (!read_hdr (abfd, &core))
 339     {
 340       if (bfd_get_error () != bfd_error_system_call)
 341         bfd_set_error (bfd_error_wrong_format);
 342       return NULL;
 343     }
 344
 345   /* This isn't the right handler for 64-bit core files on AIX 5.x.  */
 346   if (CORE_NEW (core) && CNEW_IS_CORE_DUMPXX (core))
 347     {
 348       bfd_set_error (bfd_error_wrong_format);
 349       return NULL;
 350     }
 351
 352   /* Copy fields from new or old core structure.  */
 353   if (CORE_NEW (core))
 354     {
 355       c_flag = core.new.c_flag;
 356       c_stack = (file_ptr) core.new.c_stack;
 357       c_size = core.new.c_size;
 358       c_stackend = CNEW_STACKORG (core.new) + c_size;
 359       c_lsize = CNEW_LSIZE (core.new);
 360       c_loader = CNEW_LOADER (core.new);
 361       proc64 = CNEW_PROC64 (core.new);
 362     }
 363   else
 364     {
 365       c_flag = core.old.c_flag;
 366       c_stack = (file_ptr) (ptr_to_uint) core.old.c_stack;
 367       c_size = core.old.c_size;
 368       c_stackend = COLD_STACKEND;
 369       c_lsize = 0x7ffffff;
 370       c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
 371       proc64 = 0;
 372     }
 373
 374   if (proc64)
 375     {
 376       c_regsize = sizeof (CNEW_CONTEXT64 (core.new));
 377       c_regptr = &CNEW_CONTEXT64 (core.new);
 378     }
 379   else if (CORE_NEW (core))
 380     {
 381       c_regsize = sizeof (CNEW_MSTSAVE (core.new));
 382       c_regptr = &CNEW_MSTSAVE (core.new);
 383     }
 384   else
 385     {
 386       c_regsize = sizeof (COLD_MSTSAVE (core.old));
 387       c_regptr = &COLD_MSTSAVE (core.old);
 388     }
 389   c_regoff = (char *) c_regptr - (char *) &core;
 390
 391   if (bfd_stat (abfd, &statbuf) < 0)
 392     {
 393       bfd_set_error (bfd_error_system_call);
 394       return NULL;
 395     }
 396
 397   /* If the core file ulimit is too small, the system will first
 398      omit the data segment, then omit the stack, then decline to
 399      dump core altogether (as far as I know UBLOCK_VALID and LE_VALID
 400      are always set) (this is based on experimentation on AIX 3.2).
 401      Now, the thing is that GDB users will be surprised
 402      if segments just silently don't appear (well, maybe they would
 403      think to check "info files", I don't know).
 404
 405      For the data segment, we have no choice but to keep going if it's
 406      not there, since the default behavior is not to dump it (regardless
 407      of the ulimit, it's based on SA_FULLDUMP).  But for the stack segment,
 408      if it's not there, we refuse to have anything to do with this core
 409      file.  The usefulness of a core dump without a stack segment is pretty
 410      limited anyway.  */
 411
 412   if (!(c_flag & UBLOCK_VALID)
 413       || !(c_flag & LE_VALID))
 414     {
 415       bfd_set_error (bfd_error_wrong_format);
 416       return NULL;
 417     }
 418
 419   if (!(c_flag & USTACK_VALID))
 420     {
 421       bfd_set_error (bfd_error_file_truncated);
 422       return NULL;
 423     }
 424
 425   /* Don't check the core file size for a full core, AIX 4.1 includes
 426      additional shared library sections in a full core.  */
 427   if (!(c_flag & (FULL_CORE | CORE_TRUNC)))
 428     {
 429       /* If the size is wrong, it means we're misinterpreting something.  */
 430       if (c_stack + (file_ptr) c_size != statbuf.st_size)
 431         {
 432           bfd_set_error (bfd_error_wrong_format);
 433           return NULL;
 434         }
 435     }
 436
 437   /* Sanity check on the c_tab field.  */
 438   if (!CORE_NEW (core) && (c_loader < (file_ptr) sizeof core.old ||
 439                            c_loader >= statbuf.st_size ||
 440                            c_loader >= c_stack))
 441     {
 442       bfd_set_error (bfd_error_wrong_format);
 443       return NULL;
 444     }
 445
 446   /* Issue warning if the core file was truncated during writing.  */
 447   if (c_flag & CORE_TRUNC)
 448     (*_bfd_error_handler) (_("%s: warning core file truncated"),
 449                            bfd_get_filename (abfd));
 450
 451   /* Allocate core file header.  */
 452   size = CORE_NEW (core) ? sizeof (core.new) : sizeof (core.old);
 453   tmpptr = (char *) bfd_zalloc (abfd, (bfd_size_type) size);
 454   if (!tmpptr)
 455     return NULL;
 456
 457   /* Copy core file header.  */
 458   memcpy (tmpptr, &core, size);
 459   set_tdata (abfd, tmpptr);
 460
 461   /* Set architecture.  */
 462   if (CORE_NEW (core))
 463     {
 464       enum bfd_architecture arch;
 465       unsigned long mach;
 466
 467       switch (CNEW_IMPL (core.new))
 468         {
 469         case POWER_RS1:
 470         case POWER_RSC:
 471         case POWER_RS2:
 472           arch = bfd_arch_rs6000;
 473           mach = bfd_mach_rs6k;
 474           break;
 475         default:
 476           arch = bfd_arch_powerpc;
 477           mach = bfd_mach_ppc;
 478           break;
 479         }
 480       bfd_default_set_arch_mach (abfd, arch, mach);
 481     }
 482
 483   /* .stack section.  */
 484   if (!make_bfd_asection (abfd, ".stack",
 485                           SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 486                           c_size, c_stackend - c_size, c_stack))
 487     goto fail;
 488
 489   /* .reg section for all registers.  */
 490   if (!make_bfd_asection (abfd, ".reg",
 491                           SEC_HAS_CONTENTS,
 492                           c_regsize, (bfd_vma) 0, c_regoff))
 493     goto fail;
 494
 495   /* .ldinfo section.
 496      To actually find out how long this section is in this particular
 497      core dump would require going down the whole list of struct ld_info's.
 498      See if we can just fake it.  */
 499   if (!make_bfd_asection (abfd, ".ldinfo",
 500                           SEC_HAS_CONTENTS,
 501                           c_lsize, (bfd_vma) 0, c_loader))
 502     goto fail;
 503
 504 #ifndef CORE_VERSION_1
 505   /* .data section if present.
 506      AIX 3 dumps the complete data section and sets FULL_CORE if the
 507      ulimit is large enough, otherwise the data section is omitted.
 508      AIX 4 sets FULL_CORE even if the core file is truncated, we have
 509      to examine core.c_datasize below to find out the actual size of
 510      the .data section.  */
 511   if (c_flag & FULL_CORE)
 512     {
 513       if (!make_bfd_asection (abfd, ".data",
 514                               SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 515                               (bfd_size_type) core.old.c_u.u_dsize,
 516                               (bfd_vma)
 517                                 CDATA_ADDR (core.old.c_u.u_dsize),
 518                               c_stack + c_size))
 519         goto fail;
 520     }
 521 #endif
 522
 523 #ifdef CORE_VERSION_1
 524   /* AIX 4 adds data sections from loaded objects to the core file,
 525      which can be found by examining ldinfo, and anonymously mmapped
 526      regions.  */
 527   {
 528     LdInfo ldinfo;
 529     bfd_size_type ldi_datasize;
 530     file_ptr ldi_core;
 531     uint ldi_next;
 532     bfd_vma ldi_dataorg;
 533
 534     /* Fields from new and old core structures.  */
 535     bfd_size_type c_datasize, c_vmregions;
 536     file_ptr c_data, c_vmm;
 537
 538     if (CORE_NEW (core))
 539       {
 540         c_datasize = CNEW_DATASIZE (core.new);
 541         c_data = (file_ptr) core.new.c_data;
 542         c_vmregions = core.new.c_vmregions;
 543         c_vmm = (file_ptr) core.new.c_vmm;
 544       }
 545     else
 546       {
 547         c_datasize = core.old.c_datasize;
 548         c_data = (file_ptr) (ptr_to_uint) core.old.c_data;
 549         c_vmregions = core.old.c_vmregions;
 550         c_vmm = (file_ptr) (ptr_to_uint) core.old.c_vmm;
 551       }
 552
 553     /* .data section from executable.  */
 554     if (c_datasize)
 555       {
 556         if (!make_bfd_asection (abfd, ".data",
 557                                 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 558                                 c_datasize,
 559                                 (bfd_vma) CDATA_ADDR (c_datasize),
 560                                 c_data))
 561           goto fail;
 562       }
 563
 564     /* .data sections from loaded objects.  */
 565     if (proc64)
 566       size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
 567     else
 568       size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
 569
 570     while (1)
 571       {
 572         if (bfd_seek (abfd, c_loader, SEEK_SET) != 0)
 573           goto fail;
 574         if (bfd_bread (&ldinfo, size, abfd) != size)
 575           goto fail;
 576
 577         if (proc64)
 578           {
 579             ldi_core = ldinfo.l64.ldinfo_core;
 580             ldi_datasize = ldinfo.l64.ldinfo_datasize;
 581             ldi_dataorg = (bfd_vma) ldinfo.l64.ldinfo_dataorg;
 582             ldi_next = ldinfo.l64.ldinfo_next;
 583           }
 584         else
 585           {
 586             ldi_core = ldinfo.l32.ldinfo_core;
 587             ldi_datasize = ldinfo.l32.ldinfo_datasize;
 588             ldi_dataorg = (bfd_vma) (long) ldinfo.l32.ldinfo_dataorg;
 589             ldi_next = ldinfo.l32.ldinfo_next;
 590           }
 591
 592         if (ldi_core)
 593           if (!make_bfd_asection (abfd, ".data",
 594                                   SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 595                                   ldi_datasize, ldi_dataorg, ldi_core))
 596             goto fail;
 597
 598         if (ldi_next == 0)
 599           break;
 600         c_loader += ldi_next;
 601       }
 602
 603     /* .vmdata sections from anonymously mmapped regions.  */
 604     if (c_vmregions)
 605       {
 606         bfd_size_type i;
 607
 608         if (bfd_seek (abfd, c_vmm, SEEK_SET) != 0)
 609           goto fail;
 610
 611         for (i = 0; i < c_vmregions; i++)
 612           {
 613             VmInfo vminfo;
 614             bfd_size_type vminfo_size;
 615             file_ptr vminfo_offset;
 616             bfd_vma vminfo_addr;
 617
 618             size = CORE_NEW (core) ? sizeof (vminfo.new) : sizeof (vminfo.old);
 619             if (bfd_bread (&vminfo, size, abfd) != size)
 620               goto fail;
 621
 622             if (CORE_NEW (core))
 623               {
 624                 vminfo_addr = (bfd_vma) vminfo.new.vminfo_addr;
 625                 vminfo_size = vminfo.new.vminfo_size;
 626                 vminfo_offset = vminfo.new.vminfo_offset;
 627               }
 628             else
 629               {
 630                 vminfo_addr = (bfd_vma) (long) vminfo.old.vminfo_addr;
 631                 vminfo_size = vminfo.old.vminfo_size;
 632                 vminfo_offset = vminfo.old.vminfo_offset;
 633               }
 634
 635             if (vminfo_offset)
 636               if (!make_bfd_asection (abfd, ".vmdata",
 637                                       SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 638                                       vminfo_size, vminfo_addr,
 639                                       vminfo_offset))
 640                 goto fail;
 641           }
 642       }
 643   }
 644 #endif
 645
 646   return abfd->xvec;            /* This is garbage for now.  */
 647
 648  fail:
 649   bfd_release (abfd, abfd->tdata.any);
 650   abfd->tdata.any = NULL;
 651   bfd_section_list_clear (abfd);
 652   return NULL;
 653 }
 654
 655 /* Return `TRUE' if given core is from the given executable.  */
 656
 657 bfd_boolean
 658 rs6000coff_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
 659 {
 660   CoreHdr core;
 661   bfd_size_type size;
 662   char *path, *s;
 663   size_t alloc;
 664   const char *str1, *str2;
 665   bfd_boolean ret;
 666   file_ptr c_loader;
 667
 668   if (!read_hdr (core_bfd, &core))
 669     return FALSE;
 670
 671   if (CORE_NEW (core))
 672     c_loader = CNEW_LOADER (core.new);
 673   else
 674     c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
 675
 676   if (CORE_NEW (core) && CNEW_PROC64 (core.new))
 677     size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
 678   else
 679     size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
 680
 681   if (bfd_seek (core_bfd, c_loader + size, SEEK_SET) != 0)
 682     return FALSE;
 683
 684   alloc = 100;
 685   path = bfd_malloc ((bfd_size_type) alloc);
 686   if (path == NULL)
 687     return FALSE;
 688   s = path;
 689
 690   while (1)
 691     {
 692       if (bfd_bread (s, (bfd_size_type) 1, core_bfd) != 1)
 693         {
 694           free (path);
 695           return FALSE;
 696         }
 697       if (*s == '\0')
 698         break;
 699       ++s;
 700       if (s == path + alloc)
 701         {
 702           char *n;
 703
 704           alloc *= 2;
 705           n = bfd_realloc (path, (bfd_size_type) alloc);
 706           if (n == NULL)
 707             {
 708               free (path);
 709               return FALSE;
 710             }
 711           s = n + (path - s);
 712           path = n;
 713         }
 714     }
 715
 716   str1 = strrchr (path, '/');
 717   str2 = strrchr (exec_bfd->filename, '/');
 718
 719   /* step over character '/' */
 720   str1 = str1 != NULL ? str1 + 1 : path;
 721   str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
 722
 723   if (strcmp (str1, str2) == 0)
 724     ret = TRUE;
 725   else
 726     ret = FALSE;
 727
 728   free (path);
 729
 730   return ret;
 731 }
 732
 733 char *
 734 rs6000coff_core_file_failing_command (bfd *abfd)
 735 {
 736   CoreHdr *core = core_hdr (abfd);
 737   char *com = CORE_NEW (*core) ?
 738     CNEW_COMM (core->new) : COLD_COMM (core->old);
 739
 740   if (*com)
 741     return com;
 742   else
 743     return 0;
 744 }
 745
 746 int
 747 rs6000coff_core_file_failing_signal (bfd *abfd)
 748 {
 749   CoreHdr *core = core_hdr (abfd);
 750   return CORE_NEW (*core) ? core->new.c_signo : core->old.c_signo;
 751 }
 752
 753 #endif /* AIX_CORE */