bfd/rs6000-core.c

   1 /* IBM RS/6000 "XCOFF" back-end for BFD.
   2    Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 2000
   3    Free Software Foundation, Inc.
   4    FIXME: Can someone provide a transliteration of this name into ASCII?
   5    Using the following chars caused a compiler warning on HIUX (so I replaced
   6    them with octal escapes), and isn't useful without an understanding of what
   7    character set it is.
   8    Written by Metin G. Ozisik, Mimi Ph\373\364ng-Th\345o V\365,
   9      and John Gilmore.
  10    Archive support from Damon A. Permezel.
  11    Contributed by IBM Corporation and Cygnus Support.
  12
  13 This file is part of BFD, the Binary File Descriptor library.
  14
  15 This program is free software; you can redistribute it and/or modify
  16 it under the terms of the GNU General Public License as published by
  17 the Free Software Foundation; either version 2 of the License, or
  18 (at your option) any later version.
  19
  20 This program is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public License
  26 along with this program; if not, write to the Free Software
  27 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  28
  29 /* This port currently only handles reading object files, except when
  30    compiled on an RS/6000 host.  -- no archive support, no core files.
  31    In all cases, it does not support writing.
  32
  33    This is in a separate file from coff-rs6000.c, because it includes
  34    system include files that conflict with coff/rs6000.h.
  35   */
  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 #ifdef AIX_CORE_DUMPX_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 boolean
 257 read_hdr (bfd *abfd, CoreHdr *core)
 258 {
 259   bfd_size_type size;
 260
 261   if (bfd_seek (abfd, 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   if (bfd_read (core, CORE_COMMONSZ, 1, abfd) != CORE_COMMONSZ)
 267     return false;
 268
 269   /* Read the trailing portion of the structure.  */
 270   size = CORE_NEW (*core) ? sizeof (core->new) : sizeof (core->old)
 271     - CORE_COMMONSZ;
 272   return bfd_read ((char *)core + CORE_COMMONSZ, size, 1, abfd) == size;
 273 }
 274
 275 static asection *
 276 make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
 277      bfd *abfd;
 278      CONST char *name;
 279      flagword flags;
 280      bfd_size_type _raw_size;
 281      bfd_vma vma;
 282      file_ptr filepos;
 283 {
 284   asection *asect;
 285
 286   asect = bfd_make_section_anyway (abfd, name);
 287   if (!asect)
 288     return NULL;
 289
 290   asect->flags = flags;
 291   asect->_raw_size = _raw_size;
 292   asect->vma = vma;
 293   asect->filepos = filepos;
 294   asect->alignment_power = 8;
 295
 296   return asect;
 297 }
 298
 299 /* Decide if a given bfd represents a `core' file or not. There really is no
 300    magic number or anything like, in rs6000coff.  */
 301
 302 const bfd_target *
 303 rs6000coff_core_p (abfd)
 304      bfd *abfd;
 305 {
 306   CoreHdr core;
 307   struct stat statbuf;
 308   bfd_size_type size;
 309   char *tmpptr;
 310
 311   /* Values from new and old core structures.  */
 312   int c_flag;
 313   file_ptr c_stack, c_regoff, c_loader;
 314   bfd_size_type c_size, c_regsize, c_lsize;
 315   bfd_vma c_stackend;
 316   void *c_regptr;
 317   int proc64;
 318
 319   if (!read_hdr (abfd, &core))
 320     {
 321       if (bfd_get_error () != bfd_error_system_call)
 322         bfd_set_error (bfd_error_wrong_format);
 323       return NULL;
 324     }
 325
 326   /* Copy fields from new or old core structure.  */
 327   if (CORE_NEW (core))
 328     {
 329       c_flag = core.new.c_flag;
 330       c_stack = (file_ptr) core.new.c_stack;
 331       c_size = core.new.c_size;
 332       c_stackend = CNEW_STACKORG (core.new) + c_size;
 333       c_lsize = CNEW_LSIZE (core.new);
 334       c_loader = CNEW_LOADER (core.new);
 335       proc64 = CNEW_PROC64 (core.new);
 336     }
 337   else
 338     {
 339       c_flag = core.old.c_flag;
 340       c_stack = (file_ptr) core.old.c_stack;
 341       c_size = core.old.c_size;
 342       c_stackend = COLD_STACKEND;
 343       c_lsize = 0x7ffffff;
 344       c_loader = (file_ptr) COLD_LOADER (core.old);
 345       proc64 = 0;
 346     }
 347
 348   if (proc64)
 349     {
 350       c_regsize = sizeof (CNEW_CONTEXT64 (core.new));
 351       c_regptr = &CNEW_CONTEXT64 (core.new);
 352     }
 353   else if (CORE_NEW (core))
 354     {
 355       c_regsize = sizeof (CNEW_MSTSAVE (core.new));
 356       c_regptr = &CNEW_MSTSAVE (core.new);
 357     }
 358   else
 359     {
 360       c_regsize = sizeof (COLD_MSTSAVE (core.old));
 361       c_regptr = &COLD_MSTSAVE (core.old);
 362     }
 363   c_regoff = (char *)c_regptr - (char *)&core;
 364
 365   if (bfd_stat (abfd, &statbuf) < 0)
 366     {
 367       bfd_set_error (bfd_error_system_call);
 368       return NULL;
 369     }
 370
 371   /* If the core file ulimit is too small, the system will first
 372      omit the data segment, then omit the stack, then decline to
 373      dump core altogether (as far as I know UBLOCK_VALID and LE_VALID
 374      are always set) (this is based on experimentation on AIX 3.2).
 375      Now, the thing is that GDB users will be surprised
 376      if segments just silently don't appear (well, maybe they would
 377      think to check "info files", I don't know).
 378
 379      For the data segment, we have no choice but to keep going if it's
 380      not there, since the default behavior is not to dump it (regardless
 381      of the ulimit, it's based on SA_FULLDUMP).  But for the stack segment,
 382      if it's not there, we refuse to have anything to do with this core
 383      file.  The usefulness of a core dump without a stack segment is pretty
 384      limited anyway.  */
 385
 386   if (!(c_flag & UBLOCK_VALID)
 387       || !(c_flag & LE_VALID))
 388     {
 389       bfd_set_error (bfd_error_wrong_format);
 390       return NULL;
 391     }
 392
 393   if (!(c_flag & USTACK_VALID))
 394     {
 395       bfd_set_error (bfd_error_file_truncated);
 396       return NULL;
 397     }
 398
 399   /* Don't check the core file size for a full core, AIX 4.1 includes
 400      additional shared library sections in a full core.  */
 401   if (!(c_flag & (FULL_CORE | CORE_TRUNC)))
 402     {
 403       /* If the size is wrong, it means we're misinterpreting something.  */
 404       if (c_stack + (file_ptr) c_size != statbuf.st_size)
 405         {
 406           bfd_set_error (bfd_error_wrong_format);
 407           return NULL;
 408         }
 409     }
 410
 411   /* Sanity check on the c_tab field.  */
 412   if (!CORE_NEW (core) && (c_loader < (file_ptr) sizeof core.old ||
 413                            c_loader >= statbuf.st_size ||
 414                            c_loader >= c_stack))
 415     {
 416       bfd_set_error (bfd_error_wrong_format);
 417       return NULL;
 418     }
 419
 420   /* Issue warning if the core file was truncated during writing.  */
 421   if (c_flag & CORE_TRUNC)
 422     (*_bfd_error_handler) (_("%s: warning core file truncated"),
 423                            bfd_get_filename (abfd));
 424
 425   /* Allocate core file header.  */
 426   size = CORE_NEW (core) ? sizeof (core.new) : sizeof (core.old);
 427   tmpptr = (char*) bfd_zalloc (abfd, size);
 428   if (!tmpptr)
 429     return NULL;
 430
 431   /* Copy core file header.  */
 432   memcpy (tmpptr, &core, size);
 433   set_tdata (abfd, tmpptr);
 434
 435   /* Set architecture.  */
 436   if (CORE_NEW (core))
 437     {
 438       enum bfd_architecture arch;
 439       unsigned long mach;
 440
 441       switch (CNEW_IMPL (core.new))
 442         {
 443         case POWER_RS1:
 444         case POWER_RSC:
 445         case POWER_RS2:
 446           arch = bfd_arch_rs6000;
 447           mach = bfd_mach_rs6k;
 448           break;
 449         default:
 450           arch = bfd_arch_powerpc;
 451           mach = bfd_mach_ppc;
 452           break;
 453       }
 454       bfd_default_set_arch_mach (abfd, arch, mach);
 455     }
 456
 457   /* .stack section.  */
 458   if (!make_bfd_asection (abfd, ".stack",
 459                           SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 460                           c_size, c_stackend - c_size, c_stack))
 461     return NULL;
 462
 463   /* .reg section for all registers.  */
 464   if (!make_bfd_asection (abfd, ".reg",
 465                           SEC_HAS_CONTENTS,
 466                           c_regsize, (bfd_vma) 0, c_regoff))
 467     return NULL;
 468
 469   /* .ldinfo section.
 470      To actually find out how long this section is in this particular
 471      core dump would require going down the whole list of struct ld_info's.
 472      See if we can just fake it.  */
 473   if (!make_bfd_asection (abfd, ".ldinfo",
 474                           SEC_HAS_CONTENTS,
 475                           c_lsize, (bfd_vma) 0, c_loader))
 476     return NULL;
 477
 478 #ifndef CORE_VERSION_1
 479   /* .data section if present.
 480      AIX 3 dumps the complete data section and sets FULL_CORE if the
 481      ulimit is large enough, otherwise the data section is omitted.
 482      AIX 4 sets FULL_CORE even if the core file is truncated, we have
 483      to examine core.c_datasize below to find out the actual size of
 484      the .data section.  */
 485   if (c_flag & FULL_CORE)
 486     {
 487       if (!make_bfd_asection (abfd, ".data",
 488                               SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 489                               (bfd_size_type) core.old.c_u.u_dsize,
 490                               (bfd_vma)
 491                                 CDATA_ADDR (core.old.c_u.u_dsize),
 492                               c_stack + c_size))
 493         return NULL;
 494     }
 495 #endif
 496
 497 #ifdef CORE_VERSION_1
 498   /* AIX 4 adds data sections from loaded objects to the core file,
 499      which can be found by examining ldinfo, and anonymously mmapped
 500      regions.  */
 501   {
 502     LdInfo ldinfo;
 503     bfd_size_type ldi_datasize;
 504     file_ptr ldi_core;
 505     uint ldi_next;
 506     bfd_vma ldi_dataorg;
 507
 508     /* Fields from new and old core structures.  */
 509     bfd_size_type c_datasize, c_vmregions;
 510     file_ptr c_data, c_vmm;
 511
 512     if (CORE_NEW (core))
 513       {
 514         c_datasize = CNEW_DATASIZE (core.new);
 515         c_data = (file_ptr) core.new.c_data;
 516         c_vmregions = core.new.c_vmregions;
 517         c_vmm = (file_ptr) core.new.c_vmm;
 518       }
 519     else
 520       {
 521         c_datasize = core.old.c_datasize;
 522         c_data = (file_ptr) core.old.c_data;
 523         c_vmregions = core.old.c_vmregions;
 524         c_vmm = (file_ptr) core.old.c_vmm;
 525       }
 526
 527     /* .data section from executable.  */
 528     if (c_datasize)
 529       {
 530         if (!make_bfd_asection (abfd, ".data",
 531                                 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 532                                 c_datasize,
 533                                 (bfd_vma) CDATA_ADDR (c_datasize),
 534                                 c_data))
 535           return NULL;
 536       }
 537
 538     /* .data sections from loaded objects.  */
 539     if (proc64)
 540       size = (int) ((LdInfo *)0)->l64.ldinfo_filename;
 541     else
 542       size = (int) ((LdInfo *)0)->l32.ldinfo_filename;
 543
 544     while (1)
 545       {
 546         if (bfd_seek (abfd, c_loader, SEEK_SET) != 0)
 547           return NULL;
 548         if (bfd_read (&ldinfo, size, 1, abfd) != size)
 549           return NULL;
 550
 551         if (proc64)
 552           {
 553             ldi_core = ldinfo.l64.ldinfo_core;
 554             ldi_datasize = ldinfo.l64.ldinfo_datasize;
 555             ldi_dataorg = (bfd_vma) ldinfo.l64.ldinfo_dataorg;
 556             ldi_next = ldinfo.l64.ldinfo_next;
 557           }
 558         else
 559           {
 560             ldi_core = ldinfo.l32.ldinfo_core;
 561             ldi_datasize = ldinfo.l32.ldinfo_datasize;
 562             ldi_dataorg = (bfd_vma) (long) ldinfo.l32.ldinfo_dataorg;
 563             ldi_next = ldinfo.l32.ldinfo_next;
 564           }
 565
 566         if (ldi_core)
 567           if (!make_bfd_asection (abfd, ".data",
 568                                   SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 569                                   ldi_datasize, ldi_dataorg, ldi_core))
 570               return NULL;
 571
 572         if (ldi_next == 0)
 573           break;
 574         c_loader += ldi_next;
 575       }
 576
 577     /* .vmdata sections from anonymously mmapped regions.  */
 578     if (c_vmregions)
 579       {
 580         bfd_size_type i;
 581
 582         if (bfd_seek (abfd, c_vmm, SEEK_SET) != 0)
 583           return NULL;
 584
 585         for (i = 0; i < c_vmregions; i++)
 586           {
 587             VmInfo vminfo;
 588             bfd_size_type vminfo_size;
 589             file_ptr vminfo_offset;
 590             bfd_vma vminfo_addr;
 591
 592             size = CORE_NEW (core) ? sizeof (vminfo.new) : sizeof (vminfo.old);
 593             if (bfd_read (&vminfo, size, 1, abfd) != size)
 594               return NULL;
 595
 596             if (CORE_NEW (core))
 597               {
 598                 vminfo_addr = (bfd_vma) vminfo.new.vminfo_addr;
 599                 vminfo_size = vminfo.new.vminfo_size;
 600                 vminfo_offset = vminfo.new.vminfo_offset;
 601               }
 602             else
 603               {
 604                 vminfo_addr = (bfd_vma) (long) vminfo.old.vminfo_addr;
 605                 vminfo_size = vminfo.old.vminfo_size;
 606                 vminfo_offset = vminfo.old.vminfo_offset;
 607               }
 608
 609             if (vminfo_offset)
 610               if (!make_bfd_asection (abfd, ".vmdata",
 611                                       SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 612                                       vminfo_size, vminfo_addr,
 613                                       vminfo_offset))
 614                 return NULL;
 615           }
 616       }
 617   }
 618 #endif
 619
 620   return abfd->xvec;                            /* this is garbage for now.  */
 621 }
 622
 623 /* return `true' if given core is from the given executable..  */
 624 boolean
 625 rs6000coff_core_file_matches_executable_p (core_bfd, exec_bfd)
 626      bfd *core_bfd;
 627      bfd *exec_bfd;
 628 {
 629   CoreHdr core;
 630   bfd_size_type size;
 631   char *path, *s;
 632   size_t alloc;
 633   const char *str1, *str2;
 634   boolean ret;
 635   file_ptr c_loader;
 636
 637   if (!read_hdr (core_bfd, &core))
 638     return false;
 639
 640   if (CORE_NEW (core))
 641     c_loader = CNEW_LOADER (core.new);
 642   else
 643     c_loader = (file_ptr) COLD_LOADER (core.old);
 644
 645   if (CORE_NEW (core) && CNEW_PROC64 (core.new))
 646     size = (int) ((LdInfo *)0)->l64.ldinfo_filename;
 647   else
 648     size = (int) ((LdInfo *)0)->l32.ldinfo_filename;
 649
 650   if (bfd_seek (core_bfd, c_loader + size, SEEK_SET) != 0)
 651     return false;
 652
 653   alloc = 100;
 654   path = bfd_malloc (alloc);
 655   if (path == NULL)
 656     return false;
 657   s = path;
 658
 659   while (1)
 660     {
 661       if (bfd_read (s, 1, 1, core_bfd) != 1)
 662         {
 663           free (path);
 664           return false;
 665         }
 666       if (*s == '\0')
 667         break;
 668       ++s;
 669       if (s == path + alloc)
 670         {
 671           char *n;
 672
 673           alloc *= 2;
 674           n = bfd_realloc (path, alloc);
 675           if (n == NULL)
 676             {
 677               free (path);
 678               return false;
 679             }
 680           s = n + (path - s);
 681           path = n;
 682         }
 683     }
 684
 685   str1 = strrchr (path, '/');
 686   str2 = strrchr (exec_bfd->filename, '/');
 687
 688   /* step over character '/' */
 689   str1 = str1 != NULL ? str1 + 1 : path;
 690   str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
 691
 692   if (strcmp (str1, str2) == 0)
 693     ret = true;
 694   else
 695     ret = false;
 696
 697   free (path);
 698
 699   return ret;
 700 }
 701
 702 char *
 703 rs6000coff_core_file_failing_command (abfd)
 704      bfd *abfd;
 705 {
 706   CoreHdr *core = core_hdr (abfd);
 707   char *com = CORE_NEW (*core) ?
 708     CNEW_COMM (core->new) : COLD_COMM (core->old);
 709
 710   if (*com)
 711     return com;
 712   else
 713     return 0;
 714 }
 715
 716 int
 717 rs6000coff_core_file_failing_signal (abfd)
 718      bfd *abfd;
 719 {
 720   CoreHdr *core = core_hdr (abfd);
 721   return CORE_NEW (*core) ? core->new.c_signo : core->old.c_signo;
 722 }
 723
 724 #endif /* AIX_CORE */