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
   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 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 /* ARGSUSED */
  75 const bfd_target *
  76 trad_unix_core_file_p (abfd)
  77      bfd *abfd;
  78
  79 {
  80   int val;
  81   struct user u;
  82   struct trad_core_struct *rawptr;
  83   bfd_size_type amt;
  84
  85 #ifdef TRAD_CORE_USER_OFFSET
  86   /* If defined, this macro is the file position of the user struct.  */
  87   if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
  88     return 0;
  89 #endif
  90
  91   val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
  92   if (val != sizeof u)
  93     {
  94       /* Too small to be a core file */
  95       bfd_set_error (bfd_error_wrong_format);
  96       return 0;
  97     }
  98
  99   /* Sanity check perhaps??? */
 100   if (u.u_dsize > 0x1000000)    /* Remember, it's in pages...  */
 101     {
 102       bfd_set_error (bfd_error_wrong_format);
 103       return 0;
 104     }
 105   if (u.u_ssize > 0x1000000)
 106     {
 107       bfd_set_error (bfd_error_wrong_format);
 108       return 0;
 109     }
 110
 111   /* Check that the size claimed is no greater than the file size.  */
 112   {
 113     FILE *stream = bfd_cache_lookup (abfd);
 114     struct stat statbuf;
 115     if (stream == NULL)
 116       return 0;
 117     if (fstat (fileno (stream), &statbuf) < 0)
 118       {
 119         bfd_set_error (bfd_error_system_call);
 120         return 0;
 121       }
 122     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize
 123 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 124                                  - u.u_tsize
 125 #endif
 126                                  + u.u_ssize))
 127         > (unsigned long) statbuf.st_size)
 128       {
 129         bfd_set_error (bfd_error_wrong_format);
 130         return 0;
 131       }
 132 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
 133     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
 134 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
 135         /* Some systems write the file too big.  */
 136                          + TRAD_CORE_EXTRA_SIZE_ALLOWED
 137 #endif
 138                          )
 139         < (unsigned long) statbuf.st_size)
 140       {
 141         /* The file is too big.  Maybe it's not a core file
 142            or we otherwise have bad values for u_dsize and u_ssize).  */
 143         bfd_set_error (bfd_error_wrong_format);
 144         return 0;
 145       }
 146 #endif
 147   }
 148
 149   /* OK, we believe you.  You're a core file (sure, sure).  */
 150
 151   /* Allocate both the upage and the struct core_data at once, so
 152      a single free() will free them both.  */
 153   amt = sizeof (struct trad_core_struct);
 154   rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
 155   if (rawptr == NULL)
 156     return 0;
 157
 158   abfd->tdata.trad_core_data = rawptr;
 159
 160   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 161
 162   /* Create the sections.  This is raunchy, but bfd_close wants to free
 163      them separately.  */
 164
 165   amt = sizeof (asection);
 166   core_stacksec(abfd) = (asection *) bfd_zalloc (abfd, amt);
 167   if (core_stacksec (abfd) == NULL)
 168     return NULL;
 169   amt = sizeof (asection);
 170   core_datasec (abfd) = (asection *) bfd_zalloc (abfd, amt);
 171   if (core_datasec (abfd) == NULL)
 172     return NULL;
 173   amt = sizeof (asection);
 174   core_regsec (abfd) = (asection *) bfd_zalloc (abfd, amt);
 175   if (core_regsec (abfd) == NULL)
 176     return NULL;
 177
 178   core_stacksec (abfd)->name = ".stack";
 179   core_datasec (abfd)->name = ".data";
 180   core_regsec (abfd)->name = ".reg";
 181
 182   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 183   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 184   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 185
 186   core_datasec (abfd)->_raw_size =  NBPG * u.u_dsize
 187 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 188     - NBPG * u.u_tsize
 189 #endif
 190       ;
 191   core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize;
 192   core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */
 193
 194   /* What a hack... we'd like to steal it from the exec file,
 195      since the upage does not seem to provide it.  FIXME.  */
 196 #ifdef HOST_DATA_START_ADDR
 197   core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
 198 #else
 199   core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
 200 #endif
 201
 202 #ifdef HOST_STACK_START_ADDR
 203   core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
 204 #else
 205   core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
 206 #endif
 207
 208   /* This is tricky.  As the "register section", we give them the entire
 209      upage and stack.  u.u_ar0 points to where "register 0" is stored.
 210      There are two tricks with this, though.  One is that the rest of the
 211      registers might be at positive or negative (or both) displacements
 212      from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
 213      in kernel memory, and on other systems it is an offset from the beginning
 214      of the `struct user'.
 215
 216      As a practical matter, we don't know where the registers actually are,
 217      so we have to pass the whole area to GDB.  We encode the value of u_ar0
 218      by setting the .regs section up so that its virtual memory address
 219      0 is at the place pointed to by u_ar0 (by setting the vma of the start
 220      of the section to -u_ar0).  GDB uses this info to locate the regs,
 221      using minor trickery to get around the offset-or-absolute-addr problem.  */
 222   core_regsec (abfd)->vma = - (bfd_vma) u.u_ar0;
 223
 224   core_datasec (abfd)->filepos = NBPG * UPAGES;
 225   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
 226 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 227     - NBPG * u.u_tsize
 228 #endif
 229       ;
 230   core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
 231
 232   /* Align to word at least */
 233   core_stacksec (abfd)->alignment_power = 2;
 234   core_datasec (abfd)->alignment_power = 2;
 235   core_regsec (abfd)->alignment_power = 2;
 236
 237   abfd->sections = core_stacksec (abfd);
 238   core_stacksec (abfd)->next = core_datasec (abfd);
 239   core_datasec (abfd)->next = core_regsec (abfd);
 240   abfd->section_count = 3;
 241
 242   return abfd->xvec;
 243 }
 244
 245 char *
 246 trad_unix_core_file_failing_command (abfd)
 247      bfd *abfd;
 248 {
 249 #ifndef NO_CORE_COMMAND
 250   char *com = abfd->tdata.trad_core_data->u.u_comm;
 251   if (*com)
 252     return com;
 253   else
 254 #endif
 255     return 0;
 256 }
 257
 258 /* ARGSUSED */
 259 int
 260 trad_unix_core_file_failing_signal (ignore_abfd)
 261      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 262 {
 263 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
 264   return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
 265 #else
 266   return -1;            /* FIXME, where is it? */
 267 #endif
 268 }
 269
 270 /* ARGSUSED */
 271 boolean
 272 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 273      bfd *core_bfd ATTRIBUTE_UNUSED;
 274      bfd *exec_bfd ATTRIBUTE_UNUSED;
 275 {
 276   return true;          /* FIXME, We have no way of telling at this point */
 277 }
 278 \f
 279 /* If somebody calls any byte-swapping routines, shoot them.  */
 280 static void
 281 swap_abort ()
 282 {
 283   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 284 }
 285 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 286 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 287 #define NO_SIGNED_GET \
 288   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 289
 290 const bfd_target trad_core_vec =
 291   {
 292     "trad-core",
 293     bfd_target_unknown_flavour,
 294     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 295     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 296     (HAS_RELOC | EXEC_P |       /* object flags */
 297      HAS_LINENO | HAS_DEBUG |
 298      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 299     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 300     0,                                                     /* symbol prefix */
 301     ' ',                                                   /* ar_pad_char */
 302     16,                                                    /* ar_max_namelen */
 303     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 304     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 305     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 306     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 307     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 308     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 309
 310     {                           /* bfd_check_format */
 311      _bfd_dummy_target,         /* unknown format */
 312      _bfd_dummy_target,         /* object file */
 313      _bfd_dummy_target,         /* archive */
 314      trad_unix_core_file_p      /* a core file */
 315     },
 316     {                           /* bfd_set_format */
 317      bfd_false, bfd_false,
 318      bfd_false, bfd_false
 319     },
 320     {                           /* bfd_write_contents */
 321      bfd_false, bfd_false,
 322      bfd_false, bfd_false
 323     },
 324
 325        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 326        BFD_JUMP_TABLE_COPY (_bfd_generic),
 327        BFD_JUMP_TABLE_CORE (trad_unix),
 328        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 329        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 330        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 331        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 332        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 333        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 334
 335     NULL,
 336
 337     (PTR) 0                     /* backend_data */
 338 };