bfd/irix-core.c

   1 /* BFD back-end for Irix core files.
   2    Copyright (C) 1993-2017 Free Software Foundation, Inc.
   3    Written by Stu Grossman, Cygnus Support.
   4    Converted to back-end form by Ian Lance Taylor, Cygnus Support
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23
  24 /* This file can only be compiled on systems which use Irix style core
  25    files (namely, Irix 4 and Irix 5, so far).  */
  26
  27 #include "sysdep.h"
  28 #include "bfd.h"
  29 #include "libbfd.h"
  30
  31 #ifdef IRIX_CORE
  32
  33 #include <core.out.h>
  34
  35 struct sgi_core_struct
  36 {
  37   int sig;
  38   char cmd[CORE_NAMESIZE];
  39 };
  40
  41 #define core_hdr(bfd) ((bfd)->tdata.sgi_core_data)
  42 #define core_signal(bfd) (core_hdr(bfd)->sig)
  43 #define core_command(bfd) (core_hdr(bfd)->cmd)
  44
  45 #define irix_core_core_file_matches_executable_p generic_core_file_matches_executable_p
  46 #define irix_core_core_file_pid _bfd_nocore_core_file_pid
  47
  48 static asection *make_bfd_asection
  49   (bfd *, const char *, flagword, bfd_size_type, bfd_vma, file_ptr);
  50
  51 /* Helper function for irix_core_core_file_p:
  52    32-bit and 64-bit versions.  */
  53
  54 #ifdef CORE_MAGIC64
  55 static int
  56 do_sections64 (bfd *abfd, struct coreout *coreout)
  57 {
  58   struct vmap64 vmap;
  59   char *secname;
  60   int i, val;
  61
  62   for (i = 0; i < coreout->c_nvmap; i++)
  63     {
  64       val = bfd_bread (&vmap, (bfd_size_type) sizeof vmap, abfd);
  65       if (val != sizeof vmap)
  66         break;
  67
  68       switch (vmap.v_type)
  69         {
  70         case VDATA:
  71           secname = ".data";
  72           break;
  73         case VSTACK:
  74           secname = ".stack";
  75           break;
  76 #ifdef VMAPFILE
  77         case VMAPFILE:
  78           secname = ".mapfile";
  79           break;
  80 #endif
  81         default:
  82           continue;
  83         }
  84
  85       /* A file offset of zero means that the
  86          section is not contained in the corefile.  */
  87       if (vmap.v_offset == 0)
  88         continue;
  89
  90       if (!make_bfd_asection (abfd, secname,
  91                               SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
  92                               vmap.v_len, vmap.v_vaddr, vmap.v_offset))
  93         /* Fail.  */
  94         return 0;
  95     }
  96
  97   return 1;
  98 }
  99 #endif
 100
 101 /* 32-bit version.  */
 102
 103 static int
 104 do_sections (bfd *abfd, struct coreout *coreout)
 105 {
 106   struct vmap vmap;
 107   char *secname;
 108   int i, val;
 109
 110   for (i = 0; i < coreout->c_nvmap; i++)
 111     {
 112       val = bfd_bread (&vmap, (bfd_size_type) sizeof vmap, abfd);
 113       if (val != sizeof vmap)
 114         break;
 115
 116       switch (vmap.v_type)
 117         {
 118         case VDATA:
 119           secname = ".data";
 120           break;
 121         case VSTACK:
 122           secname = ".stack";
 123           break;
 124 #ifdef VMAPFILE
 125         case VMAPFILE:
 126           secname = ".mapfile";
 127           break;
 128 #endif
 129         default:
 130           continue;
 131         }
 132
 133       /* A file offset of zero means that the
 134          section is not contained in the corefile.  */
 135       if (vmap.v_offset == 0)
 136         continue;
 137
 138       if (!make_bfd_asection (abfd, secname,
 139                               SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
 140                               vmap.v_len, vmap.v_vaddr, vmap.v_offset))
 141         /* Fail.  */
 142         return 0;
 143     }
 144   return 1;
 145 }
 146
 147 static asection *
 148 make_bfd_asection (bfd *abfd,
 149                    const char *name,
 150                    flagword flags,
 151                    bfd_size_type size,
 152                    bfd_vma vma,
 153                    file_ptr filepos)
 154 {
 155   asection *asect;
 156
 157   asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
 158   if (!asect)
 159     return NULL;
 160
 161   asect->size = size;
 162   asect->vma = vma;
 163   asect->filepos = filepos;
 164   asect->alignment_power = 4;
 165
 166   return asect;
 167 }
 168
 169 static const bfd_target *
 170 irix_core_core_file_p (bfd *abfd)
 171 {
 172   int val;
 173   struct coreout coreout;
 174   struct idesc *idg, *idf, *ids;
 175   bfd_size_type amt;
 176
 177   val = bfd_bread (&coreout, (bfd_size_type) sizeof coreout, abfd);
 178   if (val != sizeof coreout)
 179     {
 180       if (bfd_get_error () != bfd_error_system_call)
 181         bfd_set_error (bfd_error_wrong_format);
 182       return 0;
 183     }
 184
 185   if (coreout.c_version != CORE_VERSION1)
 186     return 0;
 187
 188   /* Have we got a corefile?  */
 189   switch (coreout.c_magic)
 190     {
 191     case CORE_MAGIC:    break;
 192 #ifdef CORE_MAGIC64
 193     case CORE_MAGIC64:  break;
 194 #endif
 195 #ifdef CORE_MAGICN32
 196     case CORE_MAGICN32: break;
 197 #endif
 198     default:            return 0;       /* Un-identifiable or not corefile.  */
 199     }
 200
 201   amt = sizeof (struct sgi_core_struct);
 202   core_hdr (abfd) = (struct sgi_core_struct *) bfd_zalloc (abfd, amt);
 203   if (!core_hdr (abfd))
 204     return NULL;
 205
 206   strncpy (core_command (abfd), coreout.c_name, CORE_NAMESIZE);
 207   core_signal (abfd) = coreout.c_sigcause;
 208
 209   if (bfd_seek (abfd, coreout.c_vmapoffset, SEEK_SET) != 0)
 210     goto fail;
 211
 212   /* Process corefile sections.  */
 213 #ifdef CORE_MAGIC64
 214   if (coreout.c_magic == (int) CORE_MAGIC64)
 215     {
 216       if (! do_sections64 (abfd, & coreout))
 217         goto fail;
 218     }
 219   else
 220 #endif
 221     if (! do_sections (abfd, & coreout))
 222       goto fail;
 223
 224   /* Make sure that the regs are contiguous within the core file.  */
 225
 226   idg = &coreout.c_idesc[I_GPREGS];
 227   idf = &coreout.c_idesc[I_FPREGS];
 228   ids = &coreout.c_idesc[I_SPECREGS];
 229
 230   if (idg->i_offset + idg->i_len != idf->i_offset
 231       || idf->i_offset + idf->i_len != ids->i_offset)
 232     goto fail;                  /* Can't deal with non-contig regs */
 233
 234   if (bfd_seek (abfd, idg->i_offset, SEEK_SET) != 0)
 235     goto fail;
 236
 237   if (!make_bfd_asection (abfd, ".reg",
 238                           SEC_HAS_CONTENTS,
 239                           idg->i_len + idf->i_len + ids->i_len,
 240                           0,
 241                           idg->i_offset))
 242     goto fail;
 243
 244   /* OK, we believe you.  You're a core file (sure, sure).  */
 245   bfd_default_set_arch_mach (abfd, bfd_arch_mips, 0);
 246
 247   return abfd->xvec;
 248
 249  fail:
 250   bfd_release (abfd, core_hdr (abfd));
 251   core_hdr (abfd) = NULL;
 252   bfd_section_list_clear (abfd);
 253   return NULL;
 254 }
 255
 256 static char *
 257 irix_core_core_file_failing_command (bfd *abfd)
 258 {
 259   return core_command (abfd);
 260 }
 261
 262 static int
 263 irix_core_core_file_failing_signal (bfd *abfd)
 264 {
 265   return core_signal (abfd);
 266 }
 267
 268 /* If somebody calls any byte-swapping routines, shoot them.  */
 269 static void
 270 swap_abort(void)
 271 {
 272   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 273 }
 274
 275 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 276 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 277 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 278 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 279 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 280 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 281
 282 const bfd_target core_irix_vec =
 283   {
 284     "irix-core",
 285     bfd_target_unknown_flavour,
 286     BFD_ENDIAN_BIG,             /* target byte order */
 287     BFD_ENDIAN_BIG,             /* target headers byte order */
 288     (HAS_RELOC | EXEC_P |       /* object flags */
 289      HAS_LINENO | HAS_DEBUG |
 290      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 291     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 292     0,                                                     /* symbol prefix */
 293     ' ',                                                   /* ar_pad_char */
 294     16,                                                    /* ar_max_namelen */
 295     0,                                                     /* match_priority */
 296     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 297     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 298     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 299     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 300     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 301     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 302
 303     {                           /* bfd_check_format */
 304       _bfd_dummy_target,                /* unknown format */
 305       _bfd_dummy_target,                /* object file */
 306       _bfd_dummy_target,                /* archive */
 307       irix_core_core_file_p             /* a core file */
 308     },
 309     {                           /* bfd_set_format */
 310       bfd_false, bfd_false,
 311       bfd_false, bfd_false
 312     },
 313     {                           /* bfd_write_contents */
 314       bfd_false, bfd_false,
 315       bfd_false, bfd_false
 316     },
 317
 318     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 319     BFD_JUMP_TABLE_COPY (_bfd_generic),
 320     BFD_JUMP_TABLE_CORE (irix_core),
 321     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 322     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 323     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 324     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 325     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 326     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 327
 328     NULL,
 329
 330     NULL                        /* backend_data */
 331   };
 332
 333 #endif /* IRIX_CORE */