bfd/cisco-core.c

   1 /* BFD back-end for CISCO crash dumps.
   2
   3 Copyright 1994 Free Software Foundation, Inc.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 /* core_file_failing_signal returns a host signal (this probably should
  25    be fixed).  */
  26 #include <signal.h>
  27 \f
  28 #define CRASH_INFO (0xffc)
  29 #define CRASH_MAGIC 0xdead1234
  30
  31 typedef enum {
  32     CRASH_REASON_NOTCRASHED = 0,
  33     CRASH_REASON_EXCEPTION = 1,
  34     CRASH_REASON_CORRUPT = 2,
  35   } crashreason;
  36
  37 struct crashinfo_external
  38 {
  39   char magic[4];                        /* Magic number */
  40   char version[4];              /* Version number */
  41   char reason[4];               /* Crash reason */
  42   char cpu_vector[4];           /* CPU vector for exceptions */
  43   char registers[4];            /* Pointer to saved registers */
  44   char rambase[4];              /* Base of RAM (not in V1 crash info) */
  45 };
  46 \f
  47 struct cisco_core_struct
  48 {
  49   int sig;
  50 };
  51 \f
  52 static bfd_target *
  53 cisco_core_file_p (abfd)
  54      bfd *abfd;
  55 {
  56   char buf[4];
  57   unsigned int crashinfo_offset;
  58   struct crashinfo_external crashinfo;
  59   int nread;
  60   unsigned int rambase;
  61   sec_ptr asect;
  62   struct stat statbuf;
  63
  64   if (bfd_seek (abfd, CRASH_INFO, SEEK_SET) != 0)
  65     return NULL;
  66
  67   nread = bfd_read (buf, 1, 4, abfd);
  68   if (nread != 4)
  69     {
  70       /* Maybe the file is too small (FIXME: what about other errors).  */
  71       bfd_set_error (bfd_error_wrong_format);
  72       return NULL;
  73     }
  74   crashinfo_offset = bfd_get_32 (abfd, buf);
  75
  76   if (bfd_seek (abfd, crashinfo_offset, SEEK_SET) != 0)
  77     return NULL;
  78
  79   nread = bfd_read (&crashinfo, 1, sizeof (crashinfo), abfd);
  80   if (nread != sizeof (crashinfo))
  81     {
  82       /* Maybe the file is too small (FIXME: what about other errors).  */
  83       bfd_set_error (bfd_error_wrong_format);
  84       return NULL;
  85     }
  86
  87   if (bfd_stat (abfd, &statbuf) < 0)
  88     {
  89       bfd_set_error (bfd_error_system_call);
  90       return NULL;
  91     }
  92
  93   if (bfd_get_32 (abfd, crashinfo.magic) != CRASH_MAGIC)
  94     {
  95       bfd_set_error (bfd_error_wrong_format);
  96       return NULL;
  97     }
  98
  99   switch (bfd_get_32 (abfd, crashinfo.version))
 100     {
 101     case 0:
 102       bfd_set_error (bfd_error_wrong_format);
 103       return NULL;
 104     case 1:
 105       rambase = 0;
 106       break;
 107     default:
 108     case 2:
 109       rambase = bfd_get_32 (abfd, crashinfo.rambase);
 110       break;
 111     }
 112
 113   /* OK, we believe you.  You're a core file.  */
 114
 115   abfd->tdata.cisco_core_data = (struct cisco_core_struct *)
 116     bfd_zmalloc (abfd, sizeof (struct cisco_core_struct));
 117   if (abfd->tdata.cisco_core_data == NULL)
 118     {
 119       bfd_set_error (bfd_error_no_memory);
 120       return NULL;
 121     }
 122
 123   switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
 124     {
 125     case CRASH_REASON_NOTCRASHED:
 126       /* Crash file probably came from write core.  */
 127       abfd->tdata.cisco_core_data->sig = 0;
 128       break;
 129     case CRASH_REASON_CORRUPT:
 130       /* The crash context area was corrupt -- proceed with caution.
 131          We have no way of passing this information back to the caller.  */
 132       abfd->tdata.cisco_core_data->sig = 0;
 133       break;
 134     case CRASH_REASON_EXCEPTION:
 135       /* Crash occured due to CPU exception.  */
 136
 137       /* This is 68k-specific; for MIPS we'll need to interpret
 138          cpu_vector differently based on the target configuration
 139          (since CISCO core files don't seem to have the processor
 140          encoded in them).  */
 141
 142       switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
 143         {
 144            /* bus error           */
 145         case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 146            /* address error       */
 147         case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 148            /* illegal instruction */
 149         case 4 : abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 150            /* zero divide         */
 151         case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 152            /* chk instruction     */
 153         case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 154            /* trapv instruction   */
 155         case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 156            /* privilege violation */
 157         case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
 158            /* trace trap          */
 159         case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 160            /* line 1010 emulator  */
 161         case 10: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 162            /* line 1111 emulator  */
 163         case 11: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 164
 165           /* Coprocessor protocol violation.  Using a standard MMU or FPU
 166              this cannot be triggered by software.  Call it a SIGBUS.  */
 167         case 13: abfd->tdata.cisco_core_data->sig = SIGBUS;  break;
 168
 169           /* interrupt           */
 170         case 31: abfd->tdata.cisco_core_data->sig = SIGINT;  break;
 171           /* breakpoint          */
 172         case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 173
 174           /* floating point err  */
 175         case 48: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 176           /* floating point err  */
 177         case 49: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 178           /* zero divide         */
 179         case 50: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 180           /* underflow           */
 181         case 51: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 182           /* operand error       */
 183         case 52: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 184            /* overflow            */
 185         case 53: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 186           /* NAN                 */
 187         case 54: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 188         default:
 189           /* "software generated"*/
 190           abfd->tdata.cisco_core_data->sig = SIGEMT;
 191         }
 192       break;
 193     default:
 194       /* Unknown crash reason.  */
 195       abfd->tdata.cisco_core_data->sig = 0;
 196       break;
 197     }
 198
 199   abfd->sections = NULL;
 200   abfd->section_count = 0;
 201
 202   asect = (asection *) bfd_zmalloc (sizeof (asection));
 203   if (asect == NULL)
 204     {
 205       bfd_set_error (bfd_error_no_memory);
 206       goto error_return;
 207     }
 208   asect->name = ".reg";
 209   asect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
 210   /* This can be bigger than the real size.  Set it to the size of the whole
 211      core file.  */
 212   asect->_raw_size = statbuf.st_size;
 213   asect->vma = 0;
 214   asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
 215   asect->next = abfd->sections;
 216   abfd->sections = asect;
 217   ++abfd->section_count;
 218
 219   /* There is only one section containing data from the target system's RAM.
 220      We call it .data.  */
 221   asect = (asection *) bfd_zmalloc (sizeof (asection));
 222   if (asect == NULL)
 223     {
 224       bfd_set_error (bfd_error_no_memory);
 225       goto error_return;
 226     }
 227   asect->name = ".data";
 228   asect->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 229   /* The size of memory is the size of the core file itself.  */
 230   asect->_raw_size = statbuf.st_size;
 231   asect->vma = rambase;
 232   asect->filepos = 0;
 233   asect->next = abfd->sections;
 234   abfd->sections = asect;
 235   ++abfd->section_count;
 236
 237   return abfd->xvec;
 238
 239  error_return:
 240   {
 241     sec_ptr nextsect;
 242     for (asect = abfd->sections; asect != NULL;)
 243       {
 244         nextsect = asect->next;
 245         free (asect);
 246         asect = nextsect;
 247       }
 248     free (abfd->tdata);
 249     return NULL;
 250   }
 251 }
 252
 253 char *
 254 cisco_core_file_failing_command (abfd)
 255      bfd *abfd;
 256 {
 257   return NULL;
 258 }
 259
 260 int
 261 cisco_core_file_failing_signal (abfd)
 262      bfd *abfd;
 263 {
 264   return abfd->tdata.cisco_core_data->sig;
 265 }
 266
 267 boolean
 268 cisco_core_file_matches_executable_p (core_bfd, exec_bfd)
 269      bfd *core_bfd;
 270      bfd *exec_bfd;
 271 {
 272   return true;
 273 }
 274 \f
 275 /* No archive file support via this BFD */
 276 #define cisco_openr_next_archived_file  bfd_generic_openr_next_archived_file
 277 #define cisco_generic_stat_arch_elt             bfd_generic_stat_arch_elt
 278 #define cisco_slurp_armap                       bfd_false
 279 #define cisco_slurp_extended_name_table bfd_true
 280 #define cisco_write_armap                       (boolean (*) PARAMS     \
 281     ((bfd *arch, unsigned int elength, struct orl *map, \
 282       unsigned int orl_count, int stridx))) bfd_false
 283 #define cisco_truncate_arname           bfd_dont_truncate_arname
 284 #define aout_32_openr_next_archived_file        bfd_generic_openr_next_archived_file
 285
 286 #define cisco_close_and_cleanup         bfd_generic_close_and_cleanup
 287 #define cisco_set_section_contents              (boolean (*) PARAMS     \
 288         ((bfd *abfd, asection *section, PTR data, file_ptr offset,      \
 289         bfd_size_type count))) bfd_generic_set_section_contents
 290 #define cisco_get_section_contents              bfd_generic_get_section_contents
 291 #define cisco_new_section_hook          (boolean (*) PARAMS     \
 292         ((bfd *, sec_ptr))) bfd_true
 293 #define cisco_get_symtab_upper_bound    bfd_0u
 294 #define cisco_get_symtab                        (unsigned int (*) PARAMS \
 295         ((bfd *, struct symbol_cache_entry **))) bfd_0u
 296 #define cisco_get_reloc_upper_bound             (unsigned int (*) PARAMS \
 297         ((bfd *, sec_ptr))) bfd_0u
 298 #define cisco_canonicalize_reloc                (unsigned int (*) PARAMS \
 299         ((bfd *, sec_ptr, arelent **, struct symbol_cache_entry**))) bfd_0u
 300 #define cisco_make_empty_symbol         (struct symbol_cache_entry * \
 301         (*) PARAMS ((bfd *))) bfd_false
 302 #define cisco_print_symbol                      (void (*) PARAMS        \
 303         ((bfd *, PTR, struct symbol_cache_entry  *,                     \
 304         bfd_print_symbol_type))) bfd_false
 305 #define cisco_get_symbol_info           (void (*) PARAMS        \
 306         ((bfd *, struct symbol_cache_entry  *,                  \
 307         symbol_info *))) bfd_false
 308 #define cisco_get_lineno                        (alent * (*) PARAMS     \
 309         ((bfd *, struct symbol_cache_entry *))) bfd_nullvoidptr
 310 #define cisco_set_arch_mach                     (boolean (*) PARAMS     \
 311         ((bfd *, enum bfd_architecture, unsigned long))) bfd_false
 312 #define cisco_find_nearest_line         (boolean (*) PARAMS     \
 313         ((bfd *abfd, struct sec  *section,                              \
 314          struct symbol_cache_entry  **symbols,bfd_vma offset,           \
 315          CONST char **file, CONST char **func, unsigned int *line))) bfd_false
 316 #define cisco_sizeof_headers            (int (*) PARAMS \
 317         ((bfd *, boolean))) bfd_0
 318
 319 #define cisco_bfd_debug_info_start              bfd_void
 320 #define cisco_bfd_debug_info_end                bfd_void
 321 #define cisco_bfd_debug_info_accumulate (void (*) PARAMS        \
 322         ((bfd *, struct sec *))) bfd_void
 323 #define cisco_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
 324 #define cisco_bfd_relax_section         bfd_generic_relax_section
 325 #define cisco_bfd_reloc_type_lookup \
 326   ((CONST struct reloc_howto_struct *(*) PARAMS ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)
 327 #define cisco_bfd_make_debug_symbol \
 328   ((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
 329 #define cisco_bfd_link_hash_table_create \
 330   ((struct bfd_link_hash_table *(*) PARAMS ((bfd *))) bfd_nullvoidptr)
 331 #define cisco_bfd_link_add_symbols \
 332   ((boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) bfd_false)
 333 #define cisco_bfd_final_link \
 334   ((boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) bfd_false)
 335 #define cisco_bfd_copy_private_section_data \
 336   ((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_false)
 337 #define cisco_bfd_copy_private_bfd_data \
 338   ((boolean (*) PARAMS ((bfd *, bfd *))) bfd_false)
 339 #define cisco_bfd_is_local_label \
 340   ((boolean (*) PARAMS ((bfd *, asection *))) bfd_false)
 341
 342 bfd_target cisco_core_vec =
 343   {
 344     "trad-core",
 345     bfd_target_unknown_flavour,
 346     true,                       /* target byte order */
 347     true,                       /* target headers byte order */
 348     (HAS_RELOC | EXEC_P |       /* object flags */
 349      HAS_LINENO | HAS_DEBUG |
 350      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 351     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 352     0,                                                     /* symbol prefix */
 353     ' ',                                                   /* ar_pad_char */
 354     16,                                                    /* ar_max_namelen */
 355     3,                                                     /* minimum alignment power */
 356     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 357     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 358     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
 359     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 360     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 361     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
 362
 363     {                           /* bfd_check_format */
 364      _bfd_dummy_target,         /* unknown format */
 365      _bfd_dummy_target,         /* object file */
 366      _bfd_dummy_target,         /* archive */
 367      cisco_core_file_p  /* a core file */
 368     },
 369     {                           /* bfd_set_format */
 370      bfd_false, bfd_false,
 371      bfd_false, bfd_false
 372     },
 373     {                           /* bfd_write_contents */
 374      bfd_false, bfd_false,
 375      bfd_false, bfd_false
 376     },
 377
 378     JUMP_TABLE(cisco),
 379     (PTR) 0                     /* backend_data */
 380 };