bfd/sco5-core.c

   1 /* BFD back end for SCO5 core files (U-area and raw sections)
   2    Copyright 1998 Free Software Foundation, Inc.
   3    Written by Jouke Numan <jnuman@hiscom.nl>
   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 #include <sys/paccess.h>
  34 #include <sys/region.h>
  35
  36 struct sco5_core_struct
  37 {
  38   struct user u;
  39 };
  40
  41 /* forward declarations */
  42
  43 static asection *
  44 make_bfd_asection PARAMS ((bfd *, const char *, flagword, bfd_size_type,
  45                            bfd_vma, file_ptr));
  46 static asymbol *sco5_core_make_empty_symbol PARAMS ((bfd *));
  47 static struct user *read_uarea PARAMS ((bfd *, int));
  48 const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd));
  49 char *sco5_core_file_failing_command PARAMS ((bfd *abfd));
  50 int sco5_core_file_failing_signal PARAMS ((bfd *abfd));
  51 boolean sco5_core_file_matches_executable_p PARAMS ((bfd *core_bfd,
  52                                                      bfd *exec_bfd));
  53 static void swap_abort PARAMS ((void));
  54
  55 static asection *
  56 make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
  57      bfd *abfd;
  58      const char *name;
  59      flagword flags;
  60      bfd_size_type _raw_size;
  61      bfd_vma vma;
  62      file_ptr filepos;
  63 {
  64   asection *asect;
  65
  66   asect = bfd_make_section_anyway (abfd, name);
  67   if (!asect)
  68     return NULL;
  69   asect->flags = flags;
  70   asect->_raw_size = _raw_size;
  71   asect->vma = vma;
  72   asect->filepos = filepos;
  73   asect->alignment_power = 2;
  74
  75   return asect;
  76 }
  77
  78 static asymbol *
  79 sco5_core_make_empty_symbol (abfd)
  80      bfd *abfd;
  81 {
  82   asymbol *new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
  83   if (new)
  84     new->the_bfd = abfd;
  85   return new;
  86 }
  87
  88 static struct user *
  89 read_uarea(abfd, filepos)
  90      bfd *abfd;
  91      int filepos;
  92
  93 {
  94   struct sco5_core_struct *rawptr;
  95
  96   rawptr = ((struct sco5_core_struct *)
  97             bfd_zmalloc (sizeof (struct sco5_core_struct)));
  98   if (rawptr == NULL)
  99     return NULL;
 100
 101   abfd->tdata.sco5_core_data = rawptr;
 102
 103   if ((bfd_seek (abfd, filepos, SEEK_SET) != 0)
 104       || (bfd_read ((void *)&rawptr->u, 1, sizeof rawptr->u, abfd)
 105           != sizeof rawptr->u))
 106     {
 107       bfd_set_error (bfd_error_wrong_format);
 108       return NULL;
 109     }
 110
 111   /* Sanity check perhaps??? */
 112   if (rawptr->u.u_dsize > 0x1000000)    /* Remember, it's in pages... */
 113     {
 114       bfd_set_error (bfd_error_wrong_format);
 115       return NULL;
 116     }
 117   if (rawptr->u.u_ssize > 0x1000000)
 118     {
 119       bfd_set_error (bfd_error_wrong_format);
 120       return NULL;
 121     }
 122   return &rawptr->u;
 123 }
 124
 125 /* ARGSUSED */
 126 const bfd_target *
 127 sco5_core_file_p (abfd)
 128      bfd *abfd;
 129 {
 130   int coffset_siz, val, nsecs, cheadoffs;
 131   int coresize;
 132   struct user *u;
 133   struct coreoffsets coffsets;
 134   struct coresecthead chead;
 135   char *secname;
 136   flagword flags;
 137
 138   /* Read coreoffsets region at end of core (see core(FP)) */
 139
 140   {
 141     FILE *stream = bfd_cache_lookup (abfd);
 142     struct stat statbuf;
 143     if (stream == NULL)
 144       return NULL;
 145     if (fstat (fileno (stream), &statbuf) < 0)
 146       {
 147         bfd_set_error (bfd_error_system_call);
 148         return NULL;
 149       }
 150     coresize = statbuf.st_size;
 151   }
 152   /* Last long in core is sizeof struct coreoffsets, read it */
 153   if ((bfd_seek (abfd, coresize-sizeof coffset_siz, SEEK_SET) != 0)
 154       || (bfd_read ((void *)&coffset_siz, 1, sizeof coffset_siz, abfd)
 155           != sizeof coffset_siz) )
 156     {
 157       bfd_set_error (bfd_error_wrong_format);
 158       return NULL;
 159     }
 160
 161   /* Use it to seek start of coreoffsets region, read it and determine
 162      validity */
 163   if ((bfd_seek (abfd, coresize-coffset_siz, SEEK_SET) != 0)
 164       || (bfd_read ((void *)&coffsets, 1, sizeof coffsets, abfd)
 165           != sizeof coffsets)
 166       || ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION)))
 167     {
 168       bfd_set_error (bfd_error_wrong_format);
 169       return NULL;
 170     }
 171
 172
 173   if (coffsets.u_info == 1)
 174     {
 175       /* Old version, no section heads, read info from user struct */
 176
 177       u = read_uarea(abfd, coffsets.u_user);
 178       if (! u)
 179           return NULL;
 180
 181       if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS,
 182                               (bfd_size_type) coffsets.u_usize,
 183                               0 - (bfd_vma) u->u_ar0,
 184                               (file_ptr) coffsets.u_user))
 185         return NULL;
 186
 187       if (!make_bfd_asection (abfd, ".data",
 188                               SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 189                               ((bfd_size_type) u->u_exdata.ux_dsize
 190                                + u->u_exdata.ux_bsize),
 191                               (bfd_vma) u->u_exdata.ux_datorg,
 192                               (file_ptr) coffsets.u_data))
 193         return NULL;
 194
 195       if (!make_bfd_asection (abfd, ".stack",
 196                               SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 197                               (bfd_size_type) u->u_ssize * NBPC,
 198                               (bfd_vma) u->u_sub,
 199                               (file_ptr) coffsets.u_stack))
 200         return NULL;
 201
 202       return abfd->xvec;                /* Done for version 1 */
 203     }
 204
 205   /* Immediately before coreoffsets region is a long with offset in core
 206      to first coresecthead (CORES_OFFSETS), the long before this is the
 207      number of section heads in the list. Read both longs and read the
 208      coresecthead and check its validity */
 209
 210   if ((bfd_seek (abfd,
 211                  coresize - coffset_siz - 2 * sizeof coffset_siz,
 212                  SEEK_SET) != 0)
 213       || (bfd_read ((void *)&nsecs, 1, sizeof nsecs, abfd) != sizeof nsecs)
 214       || (bfd_read ((void *)&cheadoffs, 1, sizeof cheadoffs, abfd)
 215           != sizeof cheadoffs)
 216       || (bfd_seek (abfd, cheadoffs, SEEK_SET) != 0)
 217       || (bfd_read ((void *)&chead, 1, sizeof chead, abfd) != sizeof chead)
 218       || (chead.cs_stype != CORES_OFFSETS)
 219       || (chead.cs_x.csx_magic != COREMAGIC_NUMBER))
 220     {
 221       bfd_set_error (bfd_error_wrong_format);
 222       return NULL;
 223     }
 224
 225   /* OK, we believe you.  You're a core file (sure, sure).  */
 226
 227   /* Now loop over all regions and map them */
 228   nsecs--;                              /* We've seen CORES_OFFSETS already */
 229   for (; nsecs; nsecs--)
 230     {
 231       if ((bfd_seek (abfd, chead.cs_hseek, SEEK_SET) != 0)
 232           || bfd_read ((void *)&chead, 1, sizeof chead, abfd) != sizeof chead)
 233         {
 234           bfd_set_error (bfd_error_wrong_format);
 235           return NULL;
 236         }
 237
 238       switch (chead.cs_stype)
 239         {
 240         case CORES_MAGIC:                       /* Core header, check magic */
 241           if (chead.cs_x.csx_magic != COREMAGIC_NUMBER)
 242             {
 243               bfd_set_error (bfd_error_wrong_format);
 244               return NULL;
 245             }
 246           secname = NULL;
 247           nsecs++;                              /* MAGIC not in section cnt!*/
 248           break;
 249         case CORES_UAREA:                       /* U-area, read in tdata */
 250           u = read_uarea(abfd, chead.cs_sseek);
 251           if (! u)
 252             return NULL;
 253
 254           /* This is tricky.  As the "register section", we give them
 255              the entire upage and stack.  u.u_ar0 points to where
 256              "register 0" is stored.  There are two tricks with this,
 257              though.  One is that the rest of the registers might be
 258              at positive or negative (or both) displacements from
 259              *u_ar0.  The other is that u_ar0 is sometimes an absolute
 260              address in kernel memory, and on other systems it is an
 261              offset from the beginning of the `struct user'.
 262
 263              As a practical matter, we don't know where the registers
 264              actually are, so we have to pass the whole area to GDB.
 265              We encode the value of u_ar0 by setting the .regs section
 266              up so that its virtual memory address 0 is at the place
 267              pointed to by u_ar0 (by setting the vma of the start of
 268              the section to -u_ar0).  GDB uses this info to locate the
 269              regs, using minor trickery to get around the
 270              offset-or-absolute-addr problem. */
 271
 272           chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0;
 273
 274
 275           secname = ".reg";
 276           flags = SEC_HAS_CONTENTS;
 277
 278           break;
 279         case CORES_PREGION:                     /* A program region, map it */
 280           switch (chead.cs_x.csx_preg.csxp_rtyp)
 281             {
 282             case PT_DATA:
 283               secname = ".data";        /* Data region.          */
 284               break;
 285             case PT_STACK:
 286               secname = ".stack";       /* Stack region.         */
 287               break;
 288             case PT_SHMEM:
 289               secname = ".shmem";       /* Shared memory         */
 290               break;
 291             case PT_LIBDAT:
 292               secname = ".libdat";      /* Shared library data   */
 293               break;
 294             case PT_V86:
 295               secname = ".virt86";      /* Virtual 8086 mode     */
 296               break;
 297             case PT_SHFIL:
 298               secname = ".mmfile";      /* Memory mapped file    */
 299               break;
 300             case PT_XDATA0:
 301               secname = ".Xdat0";       /* XENIX data region, virtual 0 */
 302               break;
 303             default:
 304               secname = "";
 305             }
 306           flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 307           break;
 308         case CORES_PROC:                        /* struct proc */
 309         case CORES_ITIMER:                      /* interval timers */
 310         case CORES_SCOUTSNAME:                  /* struct scoutsname */
 311           secname = NULL;       /* Ignore these */
 312           break;
 313         default:
 314           (*_bfd_error_handler) ("Unhandled SCO core file section type %d\n",
 315                                  chead.cs_stype);
 316           continue;
 317         }
 318
 319       if (secname
 320           && !make_bfd_asection (abfd, secname, flags,
 321                                  (bfd_size_type) chead.cs_vsize,
 322                                  (bfd_vma) chead.cs_vaddr,
 323                                  (file_ptr) chead.cs_sseek))
 324         return NULL;
 325
 326     }
 327
 328   return abfd->xvec;
 329
 330 }
 331
 332 char *
 333 sco5_core_file_failing_command (abfd)
 334      bfd *abfd;
 335 {
 336   char *com = abfd->tdata.sco5_core_data->u.u_comm;
 337   if (*com)
 338     return com;
 339   else
 340     return NULL;
 341 }
 342
 343 /* ARGSUSED */
 344 int
 345 sco5_core_file_failing_signal (ignore_abfd)
 346      bfd *ignore_abfd;
 347 {
 348   return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0)
 349           ? ignore_abfd->tdata.sco5_core_data->u.u_sysabort
 350           : -1);
 351 }
 352
 353 /* ARGSUSED */
 354 boolean
 355 sco5_core_file_matches_executable_p  (core_bfd, exec_bfd)
 356      bfd *core_bfd, *exec_bfd;
 357 {
 358   return true;          /* FIXME, We have no way of telling at this point */
 359 }
 360
 361 #define sco5_core_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
 362 #define sco5_core_get_symtab _bfd_nosymbols_get_symtab
 363 #define sco5_core_print_symbol _bfd_nosymbols_print_symbol
 364 #define sco5_core_get_symbol_info _bfd_nosymbols_get_symbol_info
 365 #define sco5_core_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
 366 #define sco5_core_get_lineno _bfd_nosymbols_get_lineno
 367 #define sco5_core_find_nearest_line _bfd_nosymbols_find_nearest_line
 368 #define sco5_core_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 369 #define sco5_core_read_minisymbols _bfd_nosymbols_read_minisymbols
 370 #define sco5_core_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
 371
 372 /* If somebody calls any byte-swapping routines, shoot them.  */
 373 static void
 374 swap_abort()
 375 {
 376   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 377 }
 378 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 379 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 380 #define NO_SIGNED_GET \
 381   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 382
 383 const bfd_target sco5_core_vec =
 384   {
 385     "sco5-core",
 386     bfd_target_unknown_flavour,
 387     BFD_ENDIAN_LITTLE,         /* target byte order */
 388     BFD_ENDIAN_LITTLE,         /* target headers byte order */
 389     (HAS_RELOC | EXEC_P |       /* object flags */
 390      HAS_LINENO | HAS_DEBUG |
 391      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 392     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 393     0,                                                     /* symbol prefix */
 394     ' ',                                                   /* ar_pad_char */
 395     16,                                                    /* ar_max_namelen */
 396     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 397     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 398     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 399     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 400     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 401     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 402
 403     {                           /* bfd_check_format */
 404      _bfd_dummy_target,         /* unknown format */
 405      _bfd_dummy_target,         /* object file */
 406      _bfd_dummy_target,         /* archive */
 407      sco5_core_file_p           /* a core file */
 408     },
 409     {                           /* bfd_set_format */
 410      bfd_false, bfd_false,
 411      bfd_false, bfd_false
 412     },
 413     {                           /* bfd_write_contents */
 414      bfd_false, bfd_false,
 415      bfd_false, bfd_false
 416     },
 417
 418        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 419        BFD_JUMP_TABLE_COPY (_bfd_generic),
 420        BFD_JUMP_TABLE_CORE (sco5),
 421        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 422        BFD_JUMP_TABLE_SYMBOLS (sco5_core),
 423        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 424        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 425        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 426        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 427
 428     (PTR) 0                     /* backend_data */
 429 };