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