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
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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     if (stream == NULL)
 115       return 0;
 116     if (fstat (fileno (stream), &statbuf) < 0)
 117       {
 118         bfd_set_error (bfd_error_system_call);
 119         return 0;
 120       }
 121     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize
 122 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 123                                  - u.u_tsize
 124 #endif
 125                                  + u.u_ssize))
 126         > (unsigned long) statbuf.st_size)
 127       {
 128         bfd_set_error (bfd_error_wrong_format);
 129         return 0;
 130       }
 131 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
 132     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
 133 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
 134         /* Some systems write the file too big.  */
 135                          + TRAD_CORE_EXTRA_SIZE_ALLOWED
 136 #endif
 137                          )
 138         < (unsigned long) statbuf.st_size)
 139       {
 140         /* The file is too big.  Maybe it's not a core file
 141            or we otherwise have bad values for u_dsize and u_ssize).  */
 142         bfd_set_error (bfd_error_wrong_format);
 143         return 0;
 144       }
 145 #endif
 146   }
 147
 148   /* OK, we believe you.  You're a core file (sure, sure).  */
 149
 150   /* Allocate both the upage and the struct core_data at once, so
 151      a single free() will free them both.  */
 152   amt = sizeof (struct trad_core_struct);
 153   rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
 154   if (rawptr == NULL)
 155     return 0;
 156
 157   abfd->tdata.trad_core_data = rawptr;
 158
 159   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 160
 161   /* Create the sections.  */
 162
 163   core_stacksec(abfd) = bfd_make_section_anyway (abfd, ".stack");
 164   if (core_stacksec (abfd) == NULL)
 165     goto fail;
 166   core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
 167   if (core_datasec (abfd) == NULL)
 168     goto fail;
 169   core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
 170   if (core_regsec (abfd) == NULL)
 171     goto fail;
 172
 173   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 174   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 175   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 176
 177   core_datasec (abfd)->_raw_size =  NBPG * u.u_dsize
 178 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 179     - NBPG * u.u_tsize
 180 #endif
 181       ;
 182   core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize;
 183   core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */
 184
 185   /* What a hack... we'd like to steal it from the exec file,
 186      since the upage does not seem to provide it.  FIXME.  */
 187 #ifdef HOST_DATA_START_ADDR
 188   core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
 189 #else
 190   core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
 191 #endif
 192
 193 #ifdef HOST_STACK_START_ADDR
 194   core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
 195 #else
 196   core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
 197 #endif
 198
 199   /* This is tricky.  As the "register section", we give them the entire
 200      upage and stack.  u.u_ar0 points to where "register 0" is stored.
 201      There are two tricks with this, though.  One is that the rest of the
 202      registers might be at positive or negative (or both) displacements
 203      from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
 204      in kernel memory, and on other systems it is an offset from the beginning
 205      of the `struct user'.
 206
 207      As a practical matter, we don't know where the registers actually are,
 208      so we have to pass the whole area to GDB.  We encode the value of u_ar0
 209      by setting the .regs section up so that its virtual memory address
 210      0 is at the place pointed to by u_ar0 (by setting the vma of the start
 211      of the section to -u_ar0).  GDB uses this info to locate the regs,
 212      using minor trickery to get around the offset-or-absolute-addr problem.  */
 213   core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
 214
 215   core_datasec (abfd)->filepos = NBPG * UPAGES;
 216   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
 217 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 218     - NBPG * u.u_tsize
 219 #endif
 220       ;
 221   core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
 222
 223   /* Align to word at least */
 224   core_stacksec (abfd)->alignment_power = 2;
 225   core_datasec (abfd)->alignment_power = 2;
 226   core_regsec (abfd)->alignment_power = 2;
 227
 228   return abfd->xvec;
 229
 230  fail:
 231   bfd_release (abfd, abfd->tdata.any);
 232   abfd->tdata.any = NULL;
 233   bfd_section_list_clear (abfd);
 234   return NULL;
 235 }
 236
 237 char *
 238 trad_unix_core_file_failing_command (abfd)
 239      bfd *abfd;
 240 {
 241 #ifndef NO_CORE_COMMAND
 242   char *com = abfd->tdata.trad_core_data->u.u_comm;
 243   if (*com)
 244     return com;
 245   else
 246 #endif
 247     return 0;
 248 }
 249
 250 int
 251 trad_unix_core_file_failing_signal (ignore_abfd)
 252      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 253 {
 254 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
 255   return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
 256 #else
 257   return -1;            /* FIXME, where is it? */
 258 #endif
 259 }
 260
 261 bfd_boolean
 262 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 263      bfd *core_bfd ATTRIBUTE_UNUSED;
 264      bfd *exec_bfd ATTRIBUTE_UNUSED;
 265 {
 266   return TRUE;          /* FIXME, We have no way of telling at this point */
 267 }
 268 \f
 269 /* If somebody calls any byte-swapping routines, shoot them.  */
 270 static void
 271 swap_abort ()
 272 {
 273   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 274 }
 275 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 276 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 277 #define NO_SIGNED_GET \
 278   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 279
 280 const bfd_target trad_core_vec =
 281   {
 282     "trad-core",
 283     bfd_target_unknown_flavour,
 284     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 285     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 286     (HAS_RELOC | EXEC_P |       /* object flags */
 287      HAS_LINENO | HAS_DEBUG |
 288      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 289     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 290     0,                                                     /* symbol prefix */
 291     ' ',                                                   /* ar_pad_char */
 292     16,                                                    /* ar_max_namelen */
 293     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 294     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 295     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 296     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 297     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 298     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 299
 300     {                           /* bfd_check_format */
 301      _bfd_dummy_target,         /* unknown format */
 302      _bfd_dummy_target,         /* object file */
 303      _bfd_dummy_target,         /* archive */
 304      trad_unix_core_file_p      /* a core file */
 305     },
 306     {                           /* bfd_set_format */
 307      bfd_false, bfd_false,
 308      bfd_false, bfd_false
 309     },
 310     {                           /* bfd_write_contents */
 311      bfd_false, bfd_false,
 312      bfd_false, bfd_false
 313     },
 314
 315        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 316        BFD_JUMP_TABLE_COPY (_bfd_generic),
 317        BFD_JUMP_TABLE_CORE (trad_unix),
 318        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 319        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 320        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 321        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 322        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 323        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 324
 325     NULL,
 326
 327     (PTR) 0                     /* backend_data */
 328 };