bfd/trad-core.c

   1 /* BFD back end for traditional Unix core files (U-area and raw sections)
   2    Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004
   4    Free Software Foundation, Inc.
   5    Written by John Gilmore of Cygnus Support.
   6
   7 This file is part of BFD, the Binary File Descriptor library.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "libaout.h"           /* BFD a.out internal data structures */
  27
  28 #include <sys/param.h>
  29 #ifdef HAVE_DIRENT_H
  30 # include <dirent.h>
  31 #else
  32 # ifdef HAVE_SYS_NDIR_H
  33 #  include <sys/ndir.h>
  34 # endif
  35 # ifdef HAVE_SYS_DIR_H
  36 #  include <sys/dir.h>
  37 # endif
  38 # ifdef HAVE_NDIR_H
  39 #  include <ndir.h>
  40 # endif
  41 #endif
  42 #include <signal.h>
  43
  44 #include <sys/user.h>           /* After a.out.h  */
  45
  46 #ifdef TRAD_HEADER
  47 #include TRAD_HEADER
  48 #endif
  49
  50 struct trad_core_struct
  51 {
  52   asection *data_section;
  53   asection *stack_section;
  54   asection *reg_section;
  55   struct user u;
  56 };
  57
  58 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  59 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  60 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  61 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  62
  63 /* forward declarations */
  64
  65 const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd));
  66 char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd));
  67 int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  68 bfd_boolean trad_unix_core_file_matches_executable_p
  69   PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  70 static void swap_abort PARAMS ((void));
  71
  72 /* Handle 4.2-style (and perhaps also sysV-style) core dump file.  */
  73
  74 const bfd_target *
  75 trad_unix_core_file_p (abfd)
  76      bfd *abfd;
  77
  78 {
  79   int val;
  80   struct user u;
  81   struct trad_core_struct *rawptr;
  82   bfd_size_type amt;
  83
  84 #ifdef TRAD_CORE_USER_OFFSET
  85   /* If defined, this macro is the file position of the user struct.  */
  86   if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
  87     return 0;
  88 #endif
  89
  90   val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
  91   if (val != sizeof u)
  92     {
  93       /* Too small to be a core file */
  94       bfd_set_error (bfd_error_wrong_format);
  95       return 0;
  96     }
  97
  98   /* Sanity check perhaps??? */
  99   if (u.u_dsize > 0x1000000)    /* Remember, it's in pages...  */
 100     {
 101       bfd_set_error (bfd_error_wrong_format);
 102       return 0;
 103     }
 104   if (u.u_ssize > 0x1000000)
 105     {
 106       bfd_set_error (bfd_error_wrong_format);
 107       return 0;
 108     }
 109
 110   /* Check that the size claimed is no greater than the file size.  */
 111   {
 112     FILE *stream = bfd_cache_lookup (abfd);
 113     struct stat statbuf;
 114
 115     if (fstat (fileno (stream), &statbuf) < 0)
 116       {
 117         bfd_set_error (bfd_error_system_call);
 118         return 0;
 119       }
 120     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize
 121 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 122                                  - u.u_tsize
 123 #endif
 124                                  + u.u_ssize))
 125         > (unsigned long) statbuf.st_size)
 126       {
 127         bfd_set_error (bfd_error_wrong_format);
 128         return 0;
 129       }
 130 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
 131     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
 132 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
 133         /* Some systems write the file too big.  */
 134                          + TRAD_CORE_EXTRA_SIZE_ALLOWED
 135 #endif
 136                          )
 137         < (unsigned long) statbuf.st_size)
 138       {
 139         /* The file is too big.  Maybe it's not a core file
 140            or we otherwise have bad values for u_dsize and u_ssize).  */
 141         bfd_set_error (bfd_error_wrong_format);
 142         return 0;
 143       }
 144 #endif
 145   }
 146
 147   /* OK, we believe you.  You're a core file (sure, sure).  */
 148
 149   /* Allocate both the upage and the struct core_data at once, so
 150      a single free() will free them both.  */
 151   amt = sizeof (struct trad_core_struct);
 152   rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
 153   if (rawptr == NULL)
 154     return 0;
 155
 156   abfd->tdata.trad_core_data = rawptr;
 157
 158   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 159
 160   /* Create the sections.  */
 161
 162   core_stacksec(abfd) = bfd_make_section_anyway (abfd, ".stack");
 163   if (core_stacksec (abfd) == NULL)
 164     goto fail;
 165   core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
 166   if (core_datasec (abfd) == NULL)
 167     goto fail;
 168   core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
 169   if (core_regsec (abfd) == NULL)
 170     goto fail;
 171
 172   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 173   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 174   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 175
 176   core_datasec (abfd)->size =  NBPG * u.u_dsize
 177 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 178     - NBPG * u.u_tsize
 179 #endif
 180       ;
 181   core_stacksec (abfd)->size = NBPG * u.u_ssize;
 182   core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
 183
 184   /* What a hack... we'd like to steal it from the exec file,
 185      since the upage does not seem to provide it.  FIXME.  */
 186 #ifdef HOST_DATA_START_ADDR
 187   core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
 188 #else
 189   core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
 190 #endif
 191
 192 #ifdef HOST_STACK_START_ADDR
 193   core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
 194 #else
 195   core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
 196 #endif
 197
 198   /* This is tricky.  As the "register section", we give them the entire
 199      upage and stack.  u.u_ar0 points to where "register 0" is stored.
 200      There are two tricks with this, though.  One is that the rest of the
 201      registers might be at positive or negative (or both) displacements
 202      from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
 203      in kernel memory, and on other systems it is an offset from the beginning
 204      of the `struct user'.
 205
 206      As a practical matter, we don't know where the registers actually are,
 207      so we have to pass the whole area to GDB.  We encode the value of u_ar0
 208      by setting the .regs section up so that its virtual memory address
 209      0 is at the place pointed to by u_ar0 (by setting the vma of the start
 210      of the section to -u_ar0).  GDB uses this info to locate the regs,
 211      using minor trickery to get around the offset-or-absolute-addr problem.  */
 212   core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
 213
 214   core_datasec (abfd)->filepos = NBPG * UPAGES;
 215   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
 216 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 217     - NBPG * u.u_tsize
 218 #endif
 219       ;
 220   core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
 221
 222   /* Align to word at least */
 223   core_stacksec (abfd)->alignment_power = 2;
 224   core_datasec (abfd)->alignment_power = 2;
 225   core_regsec (abfd)->alignment_power = 2;
 226
 227   return abfd->xvec;
 228
 229  fail:
 230   bfd_release (abfd, abfd->tdata.any);
 231   abfd->tdata.any = NULL;
 232   bfd_section_list_clear (abfd);
 233   return NULL;
 234 }
 235
 236 char *
 237 trad_unix_core_file_failing_command (abfd)
 238      bfd *abfd;
 239 {
 240 #ifndef NO_CORE_COMMAND
 241   char *com = abfd->tdata.trad_core_data->u.u_comm;
 242   if (*com)
 243     return com;
 244   else
 245 #endif
 246     return 0;
 247 }
 248
 249 int
 250 trad_unix_core_file_failing_signal (ignore_abfd)
 251      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 252 {
 253 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
 254   return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
 255 #else
 256   return -1;            /* FIXME, where is it? */
 257 #endif
 258 }
 259
 260 bfd_boolean
 261 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 262      bfd *core_bfd ATTRIBUTE_UNUSED;
 263      bfd *exec_bfd ATTRIBUTE_UNUSED;
 264 {
 265   return TRUE;          /* FIXME, We have no way of telling at this point */
 266 }
 267 \f
 268 /* If somebody calls any byte-swapping routines, shoot them.  */
 269 static void
 270 swap_abort ()
 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 trad_core_vec =
 283   {
 284     "trad-core",
 285     bfd_target_unknown_flavour,
 286     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 287     BFD_ENDIAN_UNKNOWN,         /* 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     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 296     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 297     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 298     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 299     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 300     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 301
 302     {                           /* bfd_check_format */
 303       _bfd_dummy_target,                /* unknown format */
 304       _bfd_dummy_target,                /* object file */
 305       _bfd_dummy_target,                /* archive */
 306       trad_unix_core_file_p             /* a core file */
 307     },
 308     {                           /* bfd_set_format */
 309       bfd_false, bfd_false,
 310       bfd_false, bfd_false
 311     },
 312     {                           /* bfd_write_contents */
 313       bfd_false, bfd_false,
 314       bfd_false, bfd_false
 315     },
 316
 317     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 318     BFD_JUMP_TABLE_COPY (_bfd_generic),
 319     BFD_JUMP_TABLE_CORE (trad_unix),
 320     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 321     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 322     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 323     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 324     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 325     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 326
 327     NULL,
 328
 329     (PTR) 0                     /* backend_data */
 330   };