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, 2005
   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 #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
  69 static void swap_abort PARAMS ((void));
  70
  71 /* Handle 4.2-style (and perhaps also sysV-style) core dump file.  */
  72
  73 const bfd_target *
  74 trad_unix_core_file_p (abfd)
  75      bfd *abfd;
  76
  77 {
  78   int val;
  79   struct user u;
  80   struct trad_core_struct *rawptr;
  81   bfd_size_type amt;
  82
  83 #ifdef TRAD_CORE_USER_OFFSET
  84   /* If defined, this macro is the file position of the user struct.  */
  85   if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
  86     return 0;
  87 #endif
  88
  89   val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
  90   if (val != sizeof u)
  91     {
  92       /* Too small to be a core file */
  93       bfd_set_error (bfd_error_wrong_format);
  94       return 0;
  95     }
  96
  97   /* Sanity check perhaps??? */
  98   if (u.u_dsize > 0x1000000)    /* Remember, it's in pages...  */
  99     {
 100       bfd_set_error (bfd_error_wrong_format);
 101       return 0;
 102     }
 103   if (u.u_ssize > 0x1000000)
 104     {
 105       bfd_set_error (bfd_error_wrong_format);
 106       return 0;
 107     }
 108
 109   /* Check that the size claimed is no greater than the file size.  */
 110   {
 111     struct stat statbuf;
 112
 113     if (bfd_stat (abfd, &statbuf) < 0)
 114       return 0;
 115
 116     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize
 117 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 118                                  - u.u_tsize
 119 #endif
 120                                  + u.u_ssize))
 121         > (unsigned long) statbuf.st_size)
 122       {
 123         bfd_set_error (bfd_error_wrong_format);
 124         return 0;
 125       }
 126 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
 127     if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
 128 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
 129         /* Some systems write the file too big.  */
 130                          + TRAD_CORE_EXTRA_SIZE_ALLOWED
 131 #endif
 132                          )
 133         < (unsigned long) statbuf.st_size)
 134       {
 135         /* The file is too big.  Maybe it's not a core file
 136            or we otherwise have bad values for u_dsize and u_ssize).  */
 137         bfd_set_error (bfd_error_wrong_format);
 138         return 0;
 139       }
 140 #endif
 141   }
 142
 143   /* OK, we believe you.  You're a core file (sure, sure).  */
 144
 145   /* Allocate both the upage and the struct core_data at once, so
 146      a single free() will free them both.  */
 147   amt = sizeof (struct trad_core_struct);
 148   rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
 149   if (rawptr == NULL)
 150     return 0;
 151
 152   abfd->tdata.trad_core_data = rawptr;
 153
 154   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 155
 156   /* Create the sections.  */
 157
 158   core_stacksec(abfd) = bfd_make_section_anyway (abfd, ".stack");
 159   if (core_stacksec (abfd) == NULL)
 160     goto fail;
 161   core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
 162   if (core_datasec (abfd) == NULL)
 163     goto fail;
 164   core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
 165   if (core_regsec (abfd) == NULL)
 166     goto fail;
 167
 168   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 169   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 170   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 171
 172   core_datasec (abfd)->size =  NBPG * u.u_dsize
 173 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 174     - NBPG * u.u_tsize
 175 #endif
 176       ;
 177   core_stacksec (abfd)->size = NBPG * u.u_ssize;
 178   core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
 179
 180   /* What a hack... we'd like to steal it from the exec file,
 181      since the upage does not seem to provide it.  FIXME.  */
 182 #ifdef HOST_DATA_START_ADDR
 183   core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
 184 #else
 185   core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
 186 #endif
 187
 188 #ifdef HOST_STACK_START_ADDR
 189   core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
 190 #else
 191   core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
 192 #endif
 193
 194   /* This is tricky.  As the "register section", we give them the entire
 195      upage and stack.  u.u_ar0 points to where "register 0" is stored.
 196      There are two tricks with this, though.  One is that the rest of the
 197      registers might be at positive or negative (or both) displacements
 198      from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
 199      in kernel memory, and on other systems it is an offset from the beginning
 200      of the `struct user'.
 201
 202      As a practical matter, we don't know where the registers actually are,
 203      so we have to pass the whole area to GDB.  We encode the value of u_ar0
 204      by setting the .regs section up so that its virtual memory address
 205      0 is at the place pointed to by u_ar0 (by setting the vma of the start
 206      of the section to -u_ar0).  GDB uses this info to locate the regs,
 207      using minor trickery to get around the offset-or-absolute-addr problem.  */
 208   core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
 209
 210   core_datasec (abfd)->filepos = NBPG * UPAGES;
 211   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
 212 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 213     - NBPG * u.u_tsize
 214 #endif
 215       ;
 216   core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
 217
 218   /* Align to word at least */
 219   core_stacksec (abfd)->alignment_power = 2;
 220   core_datasec (abfd)->alignment_power = 2;
 221   core_regsec (abfd)->alignment_power = 2;
 222
 223   return abfd->xvec;
 224
 225  fail:
 226   bfd_release (abfd, abfd->tdata.any);
 227   abfd->tdata.any = NULL;
 228   bfd_section_list_clear (abfd);
 229   return NULL;
 230 }
 231
 232 char *
 233 trad_unix_core_file_failing_command (abfd)
 234      bfd *abfd;
 235 {
 236 #ifndef NO_CORE_COMMAND
 237   char *com = abfd->tdata.trad_core_data->u.u_comm;
 238   if (*com)
 239     return com;
 240   else
 241 #endif
 242     return 0;
 243 }
 244
 245 int
 246 trad_unix_core_file_failing_signal (ignore_abfd)
 247      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 248 {
 249 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
 250   return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
 251 #else
 252   return -1;            /* FIXME, where is it? */
 253 #endif
 254 }
 255 \f
 256 /* If somebody calls any byte-swapping routines, shoot them.  */
 257 static void
 258 swap_abort ()
 259 {
 260   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 261 }
 262
 263 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 264 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 265 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 266 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 267 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 268 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 269
 270 const bfd_target trad_core_vec =
 271   {
 272     "trad-core",
 273     bfd_target_unknown_flavour,
 274     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 275     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 276     (HAS_RELOC | EXEC_P |       /* object flags */
 277      HAS_LINENO | HAS_DEBUG |
 278      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 279     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 280     0,                                                     /* symbol prefix */
 281     ' ',                                                   /* ar_pad_char */
 282     16,                                                    /* ar_max_namelen */
 283     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 284     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 285     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 286     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 287     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 288     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 289
 290     {                           /* bfd_check_format */
 291       _bfd_dummy_target,                /* unknown format */
 292       _bfd_dummy_target,                /* object file */
 293       _bfd_dummy_target,                /* archive */
 294       trad_unix_core_file_p             /* a core file */
 295     },
 296     {                           /* bfd_set_format */
 297       bfd_false, bfd_false,
 298       bfd_false, bfd_false
 299     },
 300     {                           /* bfd_write_contents */
 301       bfd_false, bfd_false,
 302       bfd_false, bfd_false
 303     },
 304
 305     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 306     BFD_JUMP_TABLE_COPY (_bfd_generic),
 307     BFD_JUMP_TABLE_CORE (trad_unix),
 308     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 309     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 310     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 311     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 312     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 313     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 314
 315     NULL,
 316
 317     (PTR) 0                     /* backend_data */
 318   };