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