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
   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
  84 #ifdef TRAD_CORE_USER_OFFSET
  85   /* If defined, this macro is the file position of the user struct.  */
  86   if (bfd_seek (abfd, TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
  87     return 0;
  88 #endif
  89
  90   val = bfd_read ((void *)&u, 1, 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   rawptr = (struct trad_core_struct *)
 153                 bfd_zmalloc (sizeof (struct trad_core_struct));
 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.  This is raunchy, but bfd_close wants to free
 162      them separately.  */
 163
 164   core_stacksec(abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 165   if (core_stacksec (abfd) == NULL)
 166     return NULL;
 167   core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 168   if (core_datasec (abfd) == NULL)
 169     return NULL;
 170   core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 171   if (core_regsec (abfd) == NULL)
 172     return NULL;
 173
 174   core_stacksec (abfd)->name = ".stack";
 175   core_datasec (abfd)->name = ".data";
 176   core_regsec (abfd)->name = ".reg";
 177
 178   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 179   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 180   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 181
 182   core_datasec (abfd)->_raw_size =  NBPG * u.u_dsize
 183 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 184     - NBPG * u.u_tsize
 185 #endif
 186       ;
 187   core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize;
 188   core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */
 189
 190   /* What a hack... we'd like to steal it from the exec file,
 191      since the upage does not seem to provide it.  FIXME.  */
 192 #ifdef HOST_DATA_START_ADDR
 193   core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
 194 #else
 195   core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
 196 #endif
 197
 198 #ifdef HOST_STACK_START_ADDR
 199   core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
 200 #else
 201   core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
 202 #endif
 203
 204   /* This is tricky.  As the "register section", we give them the entire
 205      upage and stack.  u.u_ar0 points to where "register 0" is stored.
 206      There are two tricks with this, though.  One is that the rest of the
 207      registers might be at positive or negative (or both) displacements
 208      from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
 209      in kernel memory, and on other systems it is an offset from the beginning
 210      of the `struct user'.
 211
 212      As a practical matter, we don't know where the registers actually are,
 213      so we have to pass the whole area to GDB.  We encode the value of u_ar0
 214      by setting the .regs section up so that its virtual memory address
 215      0 is at the place pointed to by u_ar0 (by setting the vma of the start
 216      of the section to -u_ar0).  GDB uses this info to locate the regs,
 217      using minor trickery to get around the offset-or-absolute-addr problem.  */
 218   core_regsec (abfd)->vma = - (bfd_vma) u.u_ar0;
 219
 220   core_datasec (abfd)->filepos = NBPG * UPAGES;
 221   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
 222 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 223     - NBPG * u.u_tsize
 224 #endif
 225       ;
 226   core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
 227
 228   /* Align to word at least */
 229   core_stacksec (abfd)->alignment_power = 2;
 230   core_datasec (abfd)->alignment_power = 2;
 231   core_regsec (abfd)->alignment_power = 2;
 232
 233   abfd->sections = core_stacksec (abfd);
 234   core_stacksec (abfd)->next = core_datasec (abfd);
 235   core_datasec (abfd)->next = core_regsec (abfd);
 236   abfd->section_count = 3;
 237
 238   return abfd->xvec;
 239 }
 240
 241 char *
 242 trad_unix_core_file_failing_command (abfd)
 243      bfd *abfd;
 244 {
 245 #ifndef NO_CORE_COMMAND
 246   char *com = abfd->tdata.trad_core_data->u.u_comm;
 247   if (*com)
 248     return com;
 249   else
 250 #endif
 251     return 0;
 252 }
 253
 254 /* ARGSUSED */
 255 int
 256 trad_unix_core_file_failing_signal (ignore_abfd)
 257      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 258 {
 259 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
 260   return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
 261 #else
 262   return -1;            /* FIXME, where is it? */
 263 #endif
 264 }
 265
 266 /* ARGSUSED */
 267 boolean
 268 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 269      bfd *core_bfd ATTRIBUTE_UNUSED;
 270      bfd *exec_bfd ATTRIBUTE_UNUSED;
 271 {
 272   return true;          /* FIXME, We have no way of telling at this point */
 273 }
 274 \f
 275 /* If somebody calls any byte-swapping routines, shoot them.  */
 276 static void
 277 swap_abort ()
 278 {
 279   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 280 }
 281 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 282 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 283 #define NO_SIGNED_GET \
 284   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 285
 286 const bfd_target trad_core_vec =
 287   {
 288     "trad-core",
 289     bfd_target_unknown_flavour,
 290     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 291     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 292     (HAS_RELOC | EXEC_P |       /* object flags */
 293      HAS_LINENO | HAS_DEBUG |
 294      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 295     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 296     0,                                                     /* symbol prefix */
 297     ' ',                                                   /* ar_pad_char */
 298     16,                                                    /* ar_max_namelen */
 299     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 300     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 301     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 302     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 303     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 304     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 305
 306     {                           /* bfd_check_format */
 307      _bfd_dummy_target,         /* unknown format */
 308      _bfd_dummy_target,         /* object file */
 309      _bfd_dummy_target,         /* archive */
 310      trad_unix_core_file_p      /* a core file */
 311     },
 312     {                           /* bfd_set_format */
 313      bfd_false, bfd_false,
 314      bfd_false, bfd_false
 315     },
 316     {                           /* bfd_write_contents */
 317      bfd_false, bfd_false,
 318      bfd_false, bfd_false
 319     },
 320
 321        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 322        BFD_JUMP_TABLE_COPY (_bfd_generic),
 323        BFD_JUMP_TABLE_CORE (trad_unix),
 324        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 325        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 326        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 327        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 328        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 329        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 330
 331     NULL,
 332
 333     (PTR) 0                     /* backend_data */
 334 };