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       if (bfd_get_error () != bfd_error_system_call)
  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       if (bfd_get_error () != bfd_error_system_call)
  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 =
 116     ((struct cisco_core_struct *)
 117      bfd_zmalloc (sizeof (struct cisco_core_struct)));
 118   if (abfd->tdata.cisco_core_data == NULL)
 119     {
 120       bfd_set_error (bfd_error_no_memory);
 121       return NULL;
 122     }
 123
 124   switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
 125     {
 126     case CRASH_REASON_NOTCRASHED:
 127       /* Crash file probably came from write core.  */
 128       abfd->tdata.cisco_core_data->sig = 0;
 129       break;
 130     case CRASH_REASON_CORRUPT:
 131       /* The crash context area was corrupt -- proceed with caution.
 132          We have no way of passing this information back to the caller.  */
 133       abfd->tdata.cisco_core_data->sig = 0;
 134       break;
 135     case CRASH_REASON_EXCEPTION:
 136       /* Crash occured due to CPU exception.  */
 137
 138       /* This is 68k-specific; for MIPS we'll need to interpret
 139          cpu_vector differently based on the target configuration
 140          (since CISCO core files don't seem to have the processor
 141          encoded in them).  */
 142
 143       switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
 144         {
 145            /* bus error           */
 146         case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 147            /* address error       */
 148         case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
 149            /* illegal instruction */
 150         case 4 : abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 151            /* zero divide         */
 152         case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 153            /* chk instruction     */
 154         case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 155            /* trapv instruction   */
 156         case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
 157            /* privilege violation */
 158         case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
 159            /* trace trap          */
 160         case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 161            /* line 1010 emulator  */
 162         case 10: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 163            /* line 1111 emulator  */
 164         case 11: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
 165
 166           /* Coprocessor protocol violation.  Using a standard MMU or FPU
 167              this cannot be triggered by software.  Call it a SIGBUS.  */
 168         case 13: abfd->tdata.cisco_core_data->sig = SIGBUS;  break;
 169
 170           /* interrupt           */
 171         case 31: abfd->tdata.cisco_core_data->sig = SIGINT;  break;
 172           /* breakpoint          */
 173         case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
 174
 175           /* floating point err  */
 176         case 48: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 177           /* floating point err  */
 178         case 49: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 179           /* zero divide         */
 180         case 50: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 181           /* underflow           */
 182         case 51: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 183           /* operand error       */
 184         case 52: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 185            /* overflow            */
 186         case 53: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 187           /* NAN                 */
 188         case 54: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
 189         default:
 190           /* "software generated"*/
 191           abfd->tdata.cisco_core_data->sig = SIGEMT;
 192         }
 193       break;
 194     default:
 195       /* Unknown crash reason.  */
 196       abfd->tdata.cisco_core_data->sig = 0;
 197       break;
 198     }
 199
 200   abfd->sections = NULL;
 201   abfd->section_count = 0;
 202
 203   asect = (asection *) bfd_zmalloc (sizeof (asection));
 204   if (asect == NULL)
 205     {
 206       bfd_set_error (bfd_error_no_memory);
 207       goto error_return;
 208     }
 209   asect->name = ".reg";
 210   asect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
 211   /* This can be bigger than the real size.  Set it to the size of the whole
 212      core file.  */
 213   asect->_raw_size = statbuf.st_size;
 214   asect->vma = 0;
 215   asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
 216   asect->next = abfd->sections;
 217   abfd->sections = asect;
 218   ++abfd->section_count;
 219
 220   /* There is only one section containing data from the target system's RAM.
 221      We call it .data.  */
 222   asect = (asection *) bfd_zmalloc (sizeof (asection));
 223   if (asect == NULL)
 224     {
 225       bfd_set_error (bfd_error_no_memory);
 226       goto error_return;
 227     }
 228   asect->name = ".data";
 229   asect->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
 230   /* The size of memory is the size of the core file itself.  */
 231   asect->_raw_size = statbuf.st_size;
 232   asect->vma = rambase;
 233   asect->filepos = 0;
 234   asect->next = abfd->sections;
 235   abfd->sections = asect;
 236   ++abfd->section_count;
 237
 238   return abfd->xvec;
 239
 240  error_return:
 241   {
 242     sec_ptr nextsect;
 243     for (asect = abfd->sections; asect != NULL;)
 244       {
 245         nextsect = asect->next;
 246         free (asect);
 247         asect = nextsect;
 248       }
 249     free (abfd->tdata.cisco_core_data);
 250     return NULL;
 251   }
 252 }
 253
 254 char *
 255 cisco_core_file_failing_command (abfd)
 256      bfd *abfd;
 257 {
 258   return NULL;
 259 }
 260
 261 int
 262 cisco_core_file_failing_signal (abfd)
 263      bfd *abfd;
 264 {
 265   return abfd->tdata.cisco_core_data->sig;
 266 }
 267
 268 boolean
 269 cisco_core_file_matches_executable_p (core_bfd, exec_bfd)
 270      bfd *core_bfd;
 271      bfd *exec_bfd;
 272 {
 273   return true;
 274 }
 275 \f
 276 bfd_target cisco_core_vec =
 277   {
 278     "trad-core",
 279     bfd_target_unknown_flavour,
 280     true,                       /* target byte order */
 281     true,                       /* target headers byte order */
 282     (HAS_RELOC | EXEC_P |       /* object flags */
 283      HAS_LINENO | HAS_DEBUG |
 284      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 285     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 286     0,                                                     /* symbol prefix */
 287     ' ',                                                   /* ar_pad_char */
 288     16,                                                    /* ar_max_namelen */
 289     3,                                                     /* minimum alignment power */
 290     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 291     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 292     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
 293     bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 294     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 295     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
 296
 297     {                           /* bfd_check_format */
 298      _bfd_dummy_target,         /* unknown format */
 299      _bfd_dummy_target,         /* object file */
 300      _bfd_dummy_target,         /* archive */
 301      cisco_core_file_p  /* a core file */
 302     },
 303     {                           /* bfd_set_format */
 304      bfd_false, bfd_false,
 305      bfd_false, bfd_false
 306     },
 307     {                           /* bfd_write_contents */
 308      bfd_false, bfd_false,
 309      bfd_false, bfd_false
 310     },
 311
 312        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 313        BFD_JUMP_TABLE_COPY (_bfd_generic),
 314        BFD_JUMP_TABLE_CORE (cisco),
 315        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 316        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 317        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 318        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 319        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 320
 321     (PTR) 0                     /* backend_data */
 322 };