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 Free Software Foundation, Inc.
   3    Written by John Gilmore of Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "libaout.h"           /* BFD a.out internal data structures */
  25
  26 #include <stdio.h>
  27 #include <sys/types.h>
  28 #include <sys/param.h>
  29 #include <sys/dir.h>
  30 #include <signal.h>
  31
  32 #include <sys/user.h>           /* After a.out.h  */
  33
  34 #ifdef TRAD_HEADER
  35 #include TRAD_HEADER
  36 #endif
  37
  38   struct trad_core_struct
  39     {
  40       asection *data_section;
  41       asection *stack_section;
  42       asection *reg_section;
  43       struct user u;
  44     } *rawptr;
  45
  46 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  47 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  48 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  49 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  50
  51 /* forward declarations */
  52
  53 const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd));
  54 char *          trad_unix_core_file_failing_command PARAMS ((bfd *abfd));
  55 int             trad_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  56 boolean         trad_unix_core_file_matches_executable_p
  57                          PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  58
  59 /* Handle 4.2-style (and perhaps also sysV-style) core dump file.  */
  60
  61 /* ARGSUSED */
  62 const bfd_target *
  63 trad_unix_core_file_p (abfd)
  64      bfd *abfd;
  65
  66 {
  67   int val;
  68   struct user u;
  69
  70 #ifdef TRAD_CORE_USER_OFFSET
  71   /* If defined, this macro is the file position of the user struct.  */
  72   if (bfd_seek (abfd, TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
  73     return 0;
  74 #endif
  75
  76   val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  77   if (val != sizeof u)
  78     {
  79       /* Too small to be a core file */
  80       bfd_set_error (bfd_error_wrong_format);
  81       return 0;
  82     }
  83
  84   /* Sanity check perhaps??? */
  85   if (u.u_dsize > 0x1000000)    /* Remember, it's in pages... */
  86     {
  87       bfd_set_error (bfd_error_wrong_format);
  88       return 0;
  89     }
  90   if (u.u_ssize > 0x1000000)
  91     {
  92       bfd_set_error (bfd_error_wrong_format);
  93       return 0;
  94     }
  95
  96   /* Check that the size claimed is no greater than the file size.  */
  97   {
  98     FILE *stream = bfd_cache_lookup (abfd);
  99     struct stat statbuf;
 100     if (stream == NULL)
 101       return 0;
 102     if (fstat (fileno (stream), &statbuf) < 0)
 103       {
 104         bfd_set_error (bfd_error_system_call);
 105         return 0;
 106       }
 107     if (NBPG * (UPAGES + u.u_dsize
 108 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
 109                 - u.u_tsize
 110 #endif
 111                 + u.u_ssize) > statbuf.st_size)
 112       {
 113         bfd_set_error (bfd_error_file_truncated);
 114         return 0;
 115       }
 116 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
 117     if (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
 118 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
 119         /* Some systems write the file too big.  */
 120         + TRAD_CORE_EXTRA_SIZE_ALLOWED
 121 #endif
 122         < statbuf.st_size)
 123       {
 124         /* The file is too big.  Maybe it's not a core file
 125            or we otherwise have bad values for u_dsize and u_ssize).  */
 126         bfd_set_error (bfd_error_wrong_format);
 127         return 0;
 128       }
 129 #endif
 130   }
 131
 132   /* OK, we believe you.  You're a core file (sure, sure).  */
 133
 134   /* Allocate both the upage and the struct core_data at once, so
 135      a single free() will free them both.  */
 136   rawptr = (struct trad_core_struct *)
 137                 bfd_zmalloc (sizeof (struct trad_core_struct));
 138   if (rawptr == NULL) {
 139     bfd_set_error (bfd_error_no_memory);
 140     return 0;
 141   }
 142
 143   abfd->tdata.trad_core_data = rawptr;
 144
 145   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 146
 147   /* Create the sections.  This is raunchy, but bfd_close wants to free
 148      them separately.  */
 149
 150   core_stacksec(abfd) = (asection *) bfd_zmalloc (sizeof (asection));
 151   if (core_stacksec (abfd) == NULL) {
 152   loser:
 153     bfd_set_error (bfd_error_no_memory);
 154     free ((void *)rawptr);
 155     return 0;
 156   }
 157   core_datasec (abfd) = (asection *) bfd_zmalloc (sizeof (asection));
 158   if (core_datasec (abfd) == NULL) {
 159   loser1:
 160     free ((void *)core_stacksec (abfd));
 161     goto loser;
 162   }
 163   core_regsec (abfd) = (asection *) bfd_zmalloc (sizeof (asection));
 164   if (core_regsec (abfd) == NULL) {
 165     free ((void *)core_datasec (abfd));
 166     goto loser1;
 167   }
 168
 169   core_stacksec (abfd)->name = ".stack";
 170   core_datasec (abfd)->name = ".data";
 171   core_regsec (abfd)->name = ".reg";
 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 = 0 - (int) 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   abfd->sections = core_stacksec (abfd);
 229   core_stacksec (abfd)->next = core_datasec (abfd);
 230   core_datasec (abfd)->next = core_regsec (abfd);
 231   abfd->section_count = 3;
 232
 233   return abfd->xvec;
 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 /* ARGSUSED */
 250 int
 251 trad_unix_core_file_failing_signal (ignore_abfd)
 252      bfd *ignore_abfd;
 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 /* ARGSUSED */
 262 boolean
 263 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 264      bfd *core_bfd, *exec_bfd;
 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 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     true,                       /* target byte order */
 285     true,                       /* 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     3,                                                     /* minimum alignment power */
 294     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 295     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 296     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 297     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 298     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 299     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 300
 301     {                           /* bfd_check_format */
 302      _bfd_dummy_target,         /* unknown format */
 303      _bfd_dummy_target,         /* object file */
 304      _bfd_dummy_target,         /* archive */
 305      trad_unix_core_file_p      /* a core file */
 306     },
 307     {                           /* bfd_set_format */
 308      bfd_false, bfd_false,
 309      bfd_false, bfd_false
 310     },
 311     {                           /* bfd_write_contents */
 312      bfd_false, bfd_false,
 313      bfd_false, bfd_false
 314     },
 315
 316        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 317        BFD_JUMP_TABLE_COPY (_bfd_generic),
 318        BFD_JUMP_TABLE_CORE (trad_unix),
 319        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 320        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 321        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 322        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 323        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 324        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 325
 326     (PTR) 0                     /* backend_data */
 327 };