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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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
  28 /* for MSVC builds */
  29 #ifndef SIGTRAP
  30 # define SIGTRAP 5
  31 #endif
  32 #ifndef SIGEMT
  33 # define SIGEMT 6
  34 #endif
  35 #ifndef SIGBUS
  36 # define SIGBUS 10
  37 #endif
  38 \f
  39 #define CRASH_INFO (0xffc)
  40 #define CRASH_MAGIC 0xdead1234
  41
  42 typedef enum {
  43     CRASH_REASON_NOTCRASHED = 0,
  44     CRASH_REASON_EXCEPTION = 1,
  45     CRASH_REASON_CORRUPT = 2,
  46   } crashreason;
  47
  48 struct crashinfo_external
  49 {
  50   char magic[4];                        /* Magic number */
  51   char version[4];              /* Version number */
  52   char reason[4];               /* Crash reason */
  53   char cpu_vector[4];           /* CPU vector for exceptions */
  54   char registers[4];            /* Pointer to saved registers */
  55   char rambase[4];              /* Base of RAM (not in V1 crash info) */
  56 };
  57 \f
  58 struct cisco_core_struct
  59 {
  60   int sig;
  61 };
  62 \f
  63 static const bfd_target *
  64 cisco_core_file_p (abfd)
  65      bfd *abfd;
  66 {
  67   char buf[4];
  68   unsigned int crashinfo_offset;
  69   struct crashinfo_external crashinfo;
  70   int nread;
  71   unsigned int rambase;
  72   sec_ptr asect;
  73   struct stat statbuf;
  74
  75   if (bfd_seek (abfd, CRASH_INFO, SEEK_SET) != 0)
  76     return NULL;
  77
  78   nread = bfd_read (buf, 1, 4, abfd);
  79   if (nread != 4)
  80     {
  81       if (bfd_get_error () != bfd_error_system_call)
  82         bfd_set_error (bfd_error_wrong_format);
  83       return NULL;
  84     }
  85   crashinfo_offset = bfd_get_32 (abfd, buf);
  86
  87   if (bfd_seek (abfd, crashinfo_offset, SEEK_SET) != 0)
  88     return NULL;
  89
  90   nread = bfd_read (&crashinfo, 1, sizeof (crashinfo), abfd);
  91   if (nread != sizeof (crashinfo))
  92     {
  93       if (bfd_get_error () != bfd_error_system_call)
  94         bfd_set_error (bfd_error_wrong_format);
  95       return NULL;
  96     }
  97
  98   if (bfd_stat (abfd, &statbuf) < 0)
  99     {
 100       bfd_set_error (bfd_error_system_call);
 101       return NULL;
 102     }
 103
 104   if (bfd_get_32 (abfd, crashinfo.magic) != CRASH_MAGIC)
 105     {
 106       bfd_set_error (bfd_error_wrong_format);
 107       return NULL;
 108     }
 109
 110   switch (bfd_get_32 (abfd, crashinfo.version))
 111     {
 112     case 0:
 113       bfd_set_error (bfd_error_wrong_format);
 114       return NULL;
 115     case 1:
 116       rambase = 0;
 117       break;
 118     default:
 119     case 2:
 120       rambase = bfd_get_32 (abfd, crashinfo.rambase);
 121       break;
 122     }
 123
 124   /* OK, we believe you.  You're a core file.  */
 125
 126   abfd->tdata.cisco_core_data =
 127     ((struct cisco_core_struct *)
 128      bfd_zmalloc (sizeof (struct cisco_core_struct)));
 129   if (abfd->tdata.cisco_core_data == NULL)
 130     return NULL;
 131
 132   switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
 133     {
 134     case CRASH_REASON_NOTCRASHED:
 135       /* Crash file probably came from write core.  */
 136       abfd->tdata.cisco_core_data->sig = 0;
 137       break;
 138     case CRASH_REASON_CORRUPT:
 139       /* The crash context area was corrupt -- proceed with caution.
 140          We have no way of passing this information back to the caller.  */
 141       abfd->tdata.cisco_core_data->sig = 0;
 142       break;
 143     case CRASH_REASON_EXCEPTION:
 144       /* Crash occured due to CPU exception.  */
 145
 146       /* This is 68k-specific; for MIPS we'll need to interpret
 147          cpu_vector differently based on the target configuration
 148          (since CISCO core files don't seem to have the processor
 149          encoded in them).  */
 150
 151       switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
 152         {
 153            /* bus error           */
 154         case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 155            /* address error       */
 156         case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 157            /* illegal instruction */
 158         case 4 : abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 159            /* zero divide         */
 160         case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 161            /* chk instruction     */
 162         case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 163            /* trapv instruction   */
 164         case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 165            /* privilege violation */
 166         case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
 167            /* trace trap          */
 168         case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 169            /* line 1010 emulator  */
 170         case 10: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 171            /* line 1111 emulator  */
 172         case 11: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 173
 174           /* Coprocessor protocol violation.  Using a standard MMU or FPU
 175              this cannot be triggered by software.  Call it a SIGBUS.  */
 176         case 13: abfd->tdata.cisco_core_data->sig = SIGBUS;  break;
 177
 178           /* interrupt           */
 179         case 31: abfd->tdata.cisco_core_data->sig = SIGINT;  break;
 180           /* breakpoint          */
 181         case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 182
 183           /* floating point err  */
 184         case 48: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 185           /* floating point err  */
 186         case 49: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 187           /* zero divide         */
 188         case 50: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 189           /* underflow           */
 190         case 51: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 191           /* operand error       */
 192         case 52: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 193            /* overflow            */
 194         case 53: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 195           /* NAN                 */
 196         case 54: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 197         default:
 198 #ifndef SIGEMT
 199 #define SIGEMT SIGTRAP
 200 #endif
 201           /* "software generated"*/
 202           abfd->tdata.cisco_core_data->sig = SIGEMT;
 203         }
 204       break;
 205     default:
 206       /* Unknown crash reason.  */
 207       abfd->tdata.cisco_core_data->sig = 0;
 208       break;
 209     }
 210
 211   abfd->sections = NULL;
 212   abfd->section_count = 0;
 213
 214   asect = (asection *) bfd_zmalloc (sizeof (asection));
 215   if (asect == NULL)
 216     goto error_return;
 217   asect->name = ".reg";
 218   asect->flags = SEC_HAS_CONTENTS;
 219   /* This can be bigger than the real size.  Set it to the size of the whole
 220      core file.  */
 221   asect->_raw_size = statbuf.st_size;
 222   asect->vma = 0;
 223   asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
 224   asect->next = abfd->sections;
 225   abfd->sections = asect;
 226   ++abfd->section_count;
 227
 228   /* There is only one section containing data from the target system's RAM.
 229      We call it .data.  */
 230   asect = (asection *) bfd_zmalloc (sizeof (asection));
 231   if (asect == NULL)
 232     goto error_return;
 233   asect->name = ".data";
 234   asect->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 235   /* The size of memory is the size of the core file itself.  */
 236   asect->_raw_size = statbuf.st_size;
 237   asect->vma = rambase;
 238   asect->filepos = 0;
 239   asect->next = abfd->sections;
 240   abfd->sections = asect;
 241   ++abfd->section_count;
 242
 243   return abfd->xvec;
 244
 245  error_return:
 246   {
 247     sec_ptr nextsect;
 248     for (asect = abfd->sections; asect != NULL;)
 249       {
 250         nextsect = asect->next;
 251         free (asect);
 252         asect = nextsect;
 253       }
 254     free (abfd->tdata.cisco_core_data);
 255     return NULL;
 256   }
 257 }
 258
 259 char *
 260 cisco_core_file_failing_command (abfd)
 261      bfd *abfd;
 262 {
 263   return NULL;
 264 }
 265
 266 int
 267 cisco_core_file_failing_signal (abfd)
 268      bfd *abfd;
 269 {
 270   return abfd->tdata.cisco_core_data->sig;
 271 }
 272
 273 boolean
 274 cisco_core_file_matches_executable_p (core_bfd, exec_bfd)
 275      bfd *core_bfd;
 276      bfd *exec_bfd;
 277 {
 278   return true;
 279 }
 280 \f
 281 const bfd_target cisco_core_vec =
 282   {
 283     "trad-core",
 284     bfd_target_unknown_flavour,
 285     BFD_ENDIAN_BIG,             /* target byte order */
 286     BFD_ENDIAN_BIG,             /* target headers byte order */
 287     (HAS_RELOC | EXEC_P |       /* object flags */
 288      HAS_LINENO | HAS_DEBUG |
 289      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 290     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 291     0,                                                     /* symbol prefix */
 292     ' ',                                                   /* ar_pad_char */
 293     16,                                                    /* ar_max_namelen */
 294     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 295     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 296     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
 297     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 298     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 299     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
 300
 301     {                           /* bfd_check_format */
 302      _bfd_dummy_target,         /* unknown format */
 303      _bfd_dummy_target,         /* object file */
 304      _bfd_dummy_target,         /* archive */
 305      cisco_core_file_p  /* a core file */
 306     },
 307     {                           /* bfd_set_format */
 308      bfd_false, bfd_false,
 309      bfd_false, bfd_false
 310     },
 311     {                           /* bfd_write_contents */
 312      bfd_false, bfd_false,
 313      bfd_false, bfd_false
 314     },
 315
 316        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 317        BFD_JUMP_TABLE_COPY (_bfd_generic),
 318        BFD_JUMP_TABLE_CORE (cisco),
 319        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 320        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 321        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 322        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 323        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 324        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 325
 326     (PTR) 0                     /* backend_data */
 327 };