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
   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 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 /* Define prototypes for certain functions, to avoid a compiler warning
 254    saying that they are missing.  */
 255
 256 const bfd_target * rs6000coff_core_p (bfd *abfd);
 257 bfd_boolean rs6000coff_core_file_matches_executable_p (bfd *core_bfd,
 258                                                        bfd *exec_bfd);
 259 char * rs6000coff_core_file_failing_command (bfd *abfd);
 260 int rs6000coff_core_file_failing_signal (bfd *abfd);
 261
 262 /* Try to read into CORE the header from the core file associated with ABFD.
 263    Return success.  */
 264
 265 static bfd_boolean
 266 read_hdr (bfd *abfd, CoreHdr *core)
 267 {
 268   bfd_size_type size;
 269
 270   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 271     return FALSE;
 272
 273   /* Read the leading portion that old and new core dump structures have in
 274      common.  */
 275   size = CORE_COMMONSZ;
 276   if (bfd_bread (core, size, abfd) != size)
 277     return FALSE;
 278
 279   /* Read the trailing portion of the structure.  */
 280   if (CORE_NEW (*core))
 281     size = sizeof (core->new);
 282   else
 283     size = sizeof (core->old);
 284   size -= CORE_COMMONSZ;
 285   return bfd_bread ((char *) core + CORE_COMMONSZ, size, abfd) == size;
 286 }
 287
 288 static asection *
 289 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
 290                    bfd_size_type size, bfd_vma vma, file_ptr filepos)
 291 {
 292   asection *asect;
 293
 294   asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
 295   if (!asect)
 296     return NULL;
 297
 298   asect->size = size;
 299   asect->vma = vma;
 300   asect->filepos = filepos;
 301   asect->alignment_power = 8;
 302
 303   return asect;
 304 }
 305
 306 /* Decide if a given bfd represents a `core' file or not. There really is no
 307    magic number or anything like, in rs6000coff.  */
 308
 309 const bfd_target *
 310 rs6000coff_core_p (bfd *abfd)
 311 {
 312   CoreHdr core;
 313   struct stat statbuf;
 314   bfd_size_type size;
 315   char *tmpptr;
 316
 317   /* Values from new and old core structures.  */
 318   int c_flag;
 319   file_ptr c_stack, c_regoff, c_loader;
 320   bfd_size_type c_size, c_regsize, c_lsize;
 321   bfd_vma c_stackend;
 322   void *c_regptr;
 323   int proc64;
 324
 325   if (!read_hdr (abfd, &core))
 326     {
 327       if (bfd_get_error () != bfd_error_system_call)
 328         bfd_set_error (bfd_error_wrong_format);
 329       return NULL;
 330     }
 331
 332   /* Copy fields from new or old core structure.  */
 333   if (CORE_NEW (core))
 334     {
 335       c_flag = core.new.c_flag;
 336       c_stack = (file_ptr) core.new.c_stack;
 337       c_size = core.new.c_size;
 338       c_stackend = CNEW_STACKORG (core.new) + c_size;
 339       c_lsize = CNEW_LSIZE (core.new);
 340       c_loader = CNEW_LOADER (core.new);
 341       proc64 = CNEW_PROC64 (core.new);
 342     }
 343   else
 344     {
 345       c_flag = core.old.c_flag;
 346       c_stack = (file_ptr) (ptr_to_uint) core.old.c_stack;
 347       c_size = core.old.c_size;
 348       c_stackend = COLD_STACKEND;
 349       c_lsize = 0x7ffffff;
 350       c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
 351       proc64 = 0;
 352     }
 353
 354   if (proc64)
 355     {
 356       c_regsize = sizeof (CNEW_CONTEXT64 (core.new));
 357       c_regptr = &CNEW_CONTEXT64 (core.new);
 358     }
 359   else if (CORE_NEW (core))
 360     {
 361       c_regsize = sizeof (CNEW_MSTSAVE (core.new));
 362       c_regptr = &CNEW_MSTSAVE (core.new);
 363     }
 364   else
 365     {
 366       c_regsize = sizeof (COLD_MSTSAVE (core.old));
 367       c_regptr = &COLD_MSTSAVE (core.old);
 368     }
 369   c_regoff = (char *) c_regptr - (char *) &core;
 370
 371   if (bfd_stat (abfd, &statbuf) < 0)
 372     {
 373       bfd_set_error (bfd_error_system_call);
 374       return NULL;
 375     }
 376
 377   /* If the core file ulimit is too small, the system will first
 378      omit the data segment, then omit the stack, then decline to
 379      dump core altogether (as far as I know UBLOCK_VALID and LE_VALID
 380      are always set) (this is based on experimentation on AIX 3.2).
 381      Now, the thing is that GDB users will be surprised
 382      if segments just silently don't appear (well, maybe they would
 383      think to check "info files", I don't know).
 384
 385      For the data segment, we have no choice but to keep going if it's
 386      not there, since the default behavior is not to dump it (regardless
 387      of the ulimit, it's based on SA_FULLDUMP).  But for the stack segment,
 388      if it's not there, we refuse to have anything to do with this core
 389      file.  The usefulness of a core dump without a stack segment is pretty
 390      limited anyway.  */
 391
 392   if (!(c_flag & UBLOCK_VALID)
 393       || !(c_flag & LE_VALID))
 394     {
 395       bfd_set_error (bfd_error_wrong_format);
 396       return NULL;
 397     }
 398
 399   if (!(c_flag & USTACK_VALID))
 400     {
 401       bfd_set_error (bfd_error_file_truncated);
 402       return NULL;
 403     }
 404
 405   /* Don't check the core file size for a full core, AIX 4.1 includes
 406      additional shared library sections in a full core.  */
 407   if (!(c_flag & (FULL_CORE | CORE_TRUNC)))
 408     {
 409       /* If the size is wrong, it means we're misinterpreting something.  */
 410       if (c_stack + (file_ptr) c_size != statbuf.st_size)
 411         {
 412           bfd_set_error (bfd_error_wrong_format);
 413           return NULL;
 414         }
 415     }
 416
 417   /* Sanity check on the c_tab field.  */
 418   if (!CORE_NEW (core) && (c_loader < (file_ptr) sizeof core.old ||
 419                            c_loader >= statbuf.st_size ||
 420                            c_loader >= c_stack))
 421     {
 422       bfd_set_error (bfd_error_wrong_format);
 423       return NULL;
 424     }
 425
 426   /* Issue warning if the core file was truncated during writing.  */
 427   if (c_flag & CORE_TRUNC)
 428     (*_bfd_error_handler) (_("%s: warning core file truncated"),
 429                            bfd_get_filename (abfd));
 430
 431   /* Allocate core file header.  */
 432   size = CORE_NEW (core) ? sizeof (core.new) : sizeof (core.old);
 433   tmpptr = (char *) bfd_zalloc (abfd, (bfd_size_type) size);
 434   if (!tmpptr)
 435     return NULL;
 436
 437   /* Copy core file header.  */
 438   memcpy (tmpptr, &core, size);
 439   set_tdata (abfd, tmpptr);
 440
 441   /* Set architecture.  */
 442   if (CORE_NEW (core))
 443     {
 444       enum bfd_architecture arch;
 445       unsigned long mach;
 446
 447       switch (CNEW_IMPL (core.new))
 448         {
 449         case POWER_RS1:
 450         case POWER_RSC:
 451         case POWER_RS2:
 452           arch = bfd_arch_rs6000;
 453           mach = bfd_mach_rs6k;
 454           break;
 455         default:
 456           arch = bfd_arch_powerpc;
 457           mach = bfd_mach_ppc;
 458           break;
 459         }
 460       bfd_default_set_arch_mach (abfd, arch, mach);
 461     }
 462
 463   /* .stack section.  */
 464   if (!make_bfd_asection (abfd, ".stack",
 465                           SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 466                           c_size, c_stackend - c_size, c_stack))
 467     goto fail;
 468
 469   /* .reg section for all registers.  */
 470   if (!make_bfd_asection (abfd, ".reg",
 471                           SEC_HAS_CONTENTS,
 472                           c_regsize, (bfd_vma) 0, c_regoff))
 473     goto fail;
 474
 475   /* .ldinfo section.
 476      To actually find out how long this section is in this particular
 477      core dump would require going down the whole list of struct ld_info's.
 478      See if we can just fake it.  */
 479   if (!make_bfd_asection (abfd, ".ldinfo",
 480                           SEC_HAS_CONTENTS,
 481                           c_lsize, (bfd_vma) 0, c_loader))
 482     goto fail;
 483
 484 #ifndef CORE_VERSION_1
 485   /* .data section if present.
 486      AIX 3 dumps the complete data section and sets FULL_CORE if the
 487      ulimit is large enough, otherwise the data section is omitted.
 488      AIX 4 sets FULL_CORE even if the core file is truncated, we have
 489      to examine core.c_datasize below to find out the actual size of
 490      the .data section.  */
 491   if (c_flag & FULL_CORE)
 492     {
 493       if (!make_bfd_asection (abfd, ".data",
 494                               SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 495                               (bfd_size_type) core.old.c_u.u_dsize,
 496                               (bfd_vma)
 497                                 CDATA_ADDR (core.old.c_u.u_dsize),
 498                               c_stack + c_size))
 499         goto fail;
 500     }
 501 #endif
 502
 503 #ifdef CORE_VERSION_1
 504   /* AIX 4 adds data sections from loaded objects to the core file,
 505      which can be found by examining ldinfo, and anonymously mmapped
 506      regions.  */
 507   {
 508     LdInfo ldinfo;
 509     bfd_size_type ldi_datasize;
 510     file_ptr ldi_core;
 511     uint ldi_next;
 512     bfd_vma ldi_dataorg;
 513
 514     /* Fields from new and old core structures.  */
 515     bfd_size_type c_datasize, c_vmregions;
 516     file_ptr c_data, c_vmm;
 517
 518     if (CORE_NEW (core))
 519       {
 520         c_datasize = CNEW_DATASIZE (core.new);
 521         c_data = (file_ptr) core.new.c_data;
 522         c_vmregions = core.new.c_vmregions;
 523         c_vmm = (file_ptr) core.new.c_vmm;
 524       }
 525     else
 526       {
 527         c_datasize = core.old.c_datasize;
 528         c_data = (file_ptr) (ptr_to_uint) core.old.c_data;
 529         c_vmregions = core.old.c_vmregions;
 530         c_vmm = (file_ptr) (ptr_to_uint) core.old.c_vmm;
 531       }
 532
 533     /* .data section from executable.  */
 534     if (c_datasize)
 535       {
 536         if (!make_bfd_asection (abfd, ".data",
 537                                 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 538                                 c_datasize,
 539                                 (bfd_vma) CDATA_ADDR (c_datasize),
 540                                 c_data))
 541           goto fail;
 542       }
 543
 544     /* .data sections from loaded objects.  */
 545     if (proc64)
 546       size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
 547     else
 548       size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
 549
 550     while (1)
 551       {
 552         if (bfd_seek (abfd, c_loader, SEEK_SET) != 0)
 553           goto fail;
 554         if (bfd_bread (&ldinfo, size, abfd) != size)
 555           goto fail;
 556
 557         if (proc64)
 558           {
 559             ldi_core = ldinfo.l64.ldinfo_core;
 560             ldi_datasize = ldinfo.l64.ldinfo_datasize;
 561             ldi_dataorg = (bfd_vma) ldinfo.l64.ldinfo_dataorg;
 562             ldi_next = ldinfo.l64.ldinfo_next;
 563           }
 564         else
 565           {
 566             ldi_core = ldinfo.l32.ldinfo_core;
 567             ldi_datasize = ldinfo.l32.ldinfo_datasize;
 568             ldi_dataorg = (bfd_vma) (long) ldinfo.l32.ldinfo_dataorg;
 569             ldi_next = ldinfo.l32.ldinfo_next;
 570           }
 571
 572         if (ldi_core)
 573           if (!make_bfd_asection (abfd, ".data",
 574                                   SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 575                                   ldi_datasize, ldi_dataorg, ldi_core))
 576             goto fail;
 577
 578         if (ldi_next == 0)
 579           break;
 580         c_loader += ldi_next;
 581       }
 582
 583     /* .vmdata sections from anonymously mmapped regions.  */
 584     if (c_vmregions)
 585       {
 586         bfd_size_type i;
 587
 588         if (bfd_seek (abfd, c_vmm, SEEK_SET) != 0)
 589           goto fail;
 590
 591         for (i = 0; i < c_vmregions; i++)
 592           {
 593             VmInfo vminfo;
 594             bfd_size_type vminfo_size;
 595             file_ptr vminfo_offset;
 596             bfd_vma vminfo_addr;
 597
 598             size = CORE_NEW (core) ? sizeof (vminfo.new) : sizeof (vminfo.old);
 599             if (bfd_bread (&vminfo, size, abfd) != size)
 600               goto fail;
 601
 602             if (CORE_NEW (core))
 603               {
 604                 vminfo_addr = (bfd_vma) vminfo.new.vminfo_addr;
 605                 vminfo_size = vminfo.new.vminfo_size;
 606                 vminfo_offset = vminfo.new.vminfo_offset;
 607               }
 608             else
 609               {
 610                 vminfo_addr = (bfd_vma) (long) vminfo.old.vminfo_addr;
 611                 vminfo_size = vminfo.old.vminfo_size;
 612                 vminfo_offset = vminfo.old.vminfo_offset;
 613               }
 614
 615             if (vminfo_offset)
 616               if (!make_bfd_asection (abfd, ".vmdata",
 617                                       SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 618                                       vminfo_size, vminfo_addr,
 619                                       vminfo_offset))
 620                 goto fail;
 621           }
 622       }
 623   }
 624 #endif
 625
 626   return abfd->xvec;            /* This is garbage for now.  */
 627
 628  fail:
 629   bfd_release (abfd, abfd->tdata.any);
 630   abfd->tdata.any = NULL;
 631   bfd_section_list_clear (abfd);
 632   return NULL;
 633 }
 634
 635 /* Return `TRUE' if given core is from the given executable.  */
 636
 637 bfd_boolean
 638 rs6000coff_core_file_matches_executable_p (bfd *core_bfd, 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) (ptr_to_uint) 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 (bfd *abfd)
 715 {
 716   CoreHdr *core = core_hdr (abfd);
 717   char *com = CORE_NEW (*core) ?
 718     CNEW_COMM (core->new) : COLD_COMM (core->old);
 719
 720   if (*com)
 721     return com;
 722   else
 723     return 0;
 724 }
 725
 726 int
 727 rs6000coff_core_file_failing_signal (bfd *abfd)
 728 {
 729   CoreHdr *core = core_hdr (abfd);
 730   return CORE_NEW (*core) ? core->new.c_signo : core->old.c_signo;
 731 }
 732
 733 #endif /* AIX_CORE */