bfd/sco5-core.c

   1 /* BFD back end for SCO5 core files (U-area and raw sections)
   2    Copyright 1998, 1999, 2000, 2001, 2002 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 struct user *read_uarea PARAMS ((bfd *, int));
  47 const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd));
  48 char *sco5_core_file_failing_command PARAMS ((bfd *abfd));
  49 int sco5_core_file_failing_signal PARAMS ((bfd *abfd));
  50 boolean sco5_core_file_matches_executable_p PARAMS ((bfd *core_bfd,
  51                                                      bfd *exec_bfd));
  52 static void swap_abort PARAMS ((void));
  53
  54 static asection *
  55 make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
  56      bfd *abfd;
  57      const char *name;
  58      flagword flags;
  59      bfd_size_type _raw_size;
  60      bfd_vma vma;
  61      file_ptr filepos;
  62 {
  63   asection *asect;
  64
  65   asect = bfd_make_section_anyway (abfd, name);
  66   if (!asect)
  67     return NULL;
  68   asect->flags = flags;
  69   asect->_raw_size = _raw_size;
  70   asect->vma = vma;
  71   asect->filepos = filepos;
  72   asect->alignment_power = 2;
  73
  74   return asect;
  75 }
  76
  77 static struct user *
  78 read_uarea(abfd, filepos)
  79      bfd *abfd;
  80      int filepos;
  81
  82 {
  83   struct sco5_core_struct *rawptr;
  84   bfd_size_type amt = sizeof (struct sco5_core_struct);
  85
  86   rawptr = (struct sco5_core_struct *) bfd_zmalloc (amt);
  87   if (rawptr == NULL)
  88     return NULL;
  89
  90   abfd->tdata.sco5_core_data = rawptr;
  91
  92   if (bfd_seek (abfd, (file_ptr) filepos, SEEK_SET) != 0
  93       || bfd_bread ((void *) &rawptr->u, (bfd_size_type) sizeof rawptr->u,
  94                    abfd) != sizeof rawptr->u)
  95     {
  96       bfd_set_error (bfd_error_wrong_format);
  97       return NULL;
  98     }
  99
 100   /* Sanity check perhaps??? */
 101   if (rawptr->u.u_dsize > 0x1000000)    /* Remember, it's in pages...  */
 102     {
 103       bfd_set_error (bfd_error_wrong_format);
 104       return NULL;
 105     }
 106   if (rawptr->u.u_ssize > 0x1000000)
 107     {
 108       bfd_set_error (bfd_error_wrong_format);
 109       return NULL;
 110     }
 111   return &rawptr->u;
 112 }
 113
 114 /* ARGSUSED */
 115 const bfd_target *
 116 sco5_core_file_p (abfd)
 117      bfd *abfd;
 118 {
 119   int coffset_siz, val, nsecs, cheadoffs;
 120   int coresize;
 121   struct user *u;
 122   struct coreoffsets coffsets;
 123   struct coresecthead chead;
 124   char *secname;
 125   flagword flags;
 126
 127   /* Read coreoffsets region at end of core (see core(FP)) */
 128
 129   {
 130     FILE *stream = bfd_cache_lookup (abfd);
 131     struct stat statbuf;
 132     if (stream == NULL)
 133       return NULL;
 134     if (fstat (fileno (stream), &statbuf) < 0)
 135       {
 136         bfd_set_error (bfd_error_system_call);
 137         return NULL;
 138       }
 139     coresize = statbuf.st_size;
 140   }
 141   /* Last long in core is sizeof struct coreoffsets, read it */
 142   if ((bfd_seek (abfd, (file_ptr) (coresize - sizeof coffset_siz),
 143                  SEEK_SET) != 0)
 144       || bfd_bread ((void *) &coffset_siz, (bfd_size_type) sizeof coffset_siz,
 145                    abfd) != sizeof coffset_siz)
 146     {
 147       bfd_set_error (bfd_error_wrong_format);
 148       return NULL;
 149     }
 150
 151   /* Use it to seek start of coreoffsets region, read it and determine
 152      validity */
 153   if ((bfd_seek (abfd, (file_ptr) (coresize - coffset_siz), SEEK_SET) != 0)
 154       || (bfd_bread ((void *) &coffsets, (bfd_size_type) sizeof coffsets, abfd)
 155           != sizeof coffsets)
 156       || ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION)))
 157     {
 158       bfd_set_error (bfd_error_wrong_format);
 159       return NULL;
 160     }
 161
 162   if (coffsets.u_info == 1)
 163     {
 164       /* Old version, no section heads, read info from user struct */
 165
 166       u = read_uarea (abfd, coffsets.u_user);
 167       if (! u)
 168         goto fail;
 169
 170       if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS,
 171                               (bfd_size_type) coffsets.u_usize,
 172                               0 - (bfd_vma) u->u_ar0,
 173                               (file_ptr) coffsets.u_user))
 174         goto fail;
 175
 176       if (!make_bfd_asection (abfd, ".data",
 177                               SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 178                               ((bfd_size_type) u->u_exdata.ux_dsize
 179                                + u->u_exdata.ux_bsize),
 180                               (bfd_vma) u->u_exdata.ux_datorg,
 181                               (file_ptr) coffsets.u_data))
 182         goto fail;
 183
 184       if (!make_bfd_asection (abfd, ".stack",
 185                               SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 186                               (bfd_size_type) u->u_ssize * NBPC,
 187                               (bfd_vma) u->u_sub,
 188                               (file_ptr) coffsets.u_stack))
 189         goto fail;
 190
 191       return abfd->xvec;                /* Done for version 1 */
 192     }
 193
 194   /* Immediately before coreoffsets region is a long with offset in core
 195      to first coresecthead (CORES_OFFSETS), the long before this is the
 196      number of section heads in the list. Read both longs and read the
 197      coresecthead and check its validity */
 198
 199   if ((bfd_seek (abfd,
 200                  (file_ptr) (coresize - coffset_siz - 2 * sizeof coffset_siz),
 201                  SEEK_SET) != 0)
 202       || (bfd_bread ((void *) &nsecs, (bfd_size_type) sizeof nsecs, abfd)
 203           != sizeof nsecs)
 204       || (bfd_bread ((void *) &cheadoffs, (bfd_size_type) sizeof cheadoffs,
 205                     abfd) != sizeof cheadoffs)
 206       || (bfd_seek (abfd, (file_ptr) cheadoffs, SEEK_SET) != 0)
 207       || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)
 208           != sizeof chead)
 209       || (chead.cs_stype != CORES_OFFSETS)
 210       || (chead.cs_x.csx_magic != COREMAGIC_NUMBER))
 211     {
 212       bfd_set_error (bfd_error_wrong_format);
 213       goto fail;
 214     }
 215
 216   /* OK, we believe you.  You're a core file (sure, sure).  */
 217
 218   /* Now loop over all regions and map them */
 219   nsecs--;                              /* We've seen CORES_OFFSETS already */
 220   for (; nsecs; nsecs--)
 221     {
 222       if ((bfd_seek (abfd, (file_ptr) chead.cs_hseek, SEEK_SET) != 0)
 223           || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)
 224               != sizeof chead))
 225         {
 226           bfd_set_error (bfd_error_wrong_format);
 227           goto fail;
 228         }
 229
 230       switch (chead.cs_stype)
 231         {
 232         case CORES_MAGIC:                       /* Core header, check magic */
 233           if (chead.cs_x.csx_magic != COREMAGIC_NUMBER)
 234             {
 235               bfd_set_error (bfd_error_wrong_format);
 236               goto fail;
 237             }
 238           secname = NULL;
 239           nsecs++;                              /* MAGIC not in section cnt!*/
 240           break;
 241         case CORES_UAREA:                       /* U-area, read in tdata */
 242           u = read_uarea (abfd, chead.cs_sseek);
 243           if (! u)
 244             goto fail;
 245
 246           /* This is tricky.  As the "register section", we give them
 247              the entire upage and stack.  u.u_ar0 points to where
 248              "register 0" is stored.  There are two tricks with this,
 249              though.  One is that the rest of the registers might be
 250              at positive or negative (or both) displacements from
 251              *u_ar0.  The other is that u_ar0 is sometimes an absolute
 252              address in kernel memory, and on other systems it is an
 253              offset from the beginning of the `struct user'.
 254
 255              As a practical matter, we don't know where the registers
 256              actually are, so we have to pass the whole area to GDB.
 257              We encode the value of u_ar0 by setting the .regs section
 258              up so that its virtual memory address 0 is at the place
 259              pointed to by u_ar0 (by setting the vma of the start of
 260              the section to -u_ar0).  GDB uses this info to locate the
 261              regs, using minor trickery to get around the
 262              offset-or-absolute-addr problem.  */
 263
 264           chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0;
 265
 266           secname = ".reg";
 267           flags = SEC_HAS_CONTENTS;
 268
 269           break;
 270         case CORES_PREGION:                     /* A program region, map it */
 271           switch (chead.cs_x.csx_preg.csxp_rtyp)
 272             {
 273             case PT_DATA:
 274               secname = ".data";        /* Data region.          */
 275               break;
 276             case PT_STACK:
 277               secname = ".stack";       /* Stack region.         */
 278               break;
 279             case PT_SHMEM:
 280               secname = ".shmem";       /* Shared memory         */
 281               break;
 282             case PT_LIBDAT:
 283               secname = ".libdat";      /* Shared library data   */
 284               break;
 285             case PT_V86:
 286               secname = ".virt86";      /* Virtual 8086 mode     */
 287               break;
 288             case PT_SHFIL:
 289               secname = ".mmfile";      /* Memory mapped file    */
 290               break;
 291             case PT_XDATA0:
 292               secname = ".Xdat0";       /* XENIX data region, virtual 0 */
 293               break;
 294             default:
 295               secname = "";
 296             }
 297           flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 298           break;
 299         case CORES_PROC:                        /* struct proc */
 300         case CORES_ITIMER:                      /* interval timers */
 301         case CORES_SCOUTSNAME:                  /* struct scoutsname */
 302           secname = NULL;       /* Ignore these */
 303           break;
 304         default:
 305           (*_bfd_error_handler) ("Unhandled SCO core file section type %d\n",
 306                                  chead.cs_stype);
 307           continue;
 308         }
 309
 310       if (secname
 311           && !make_bfd_asection (abfd, secname, flags,
 312                                  (bfd_size_type) chead.cs_vsize,
 313                                  (bfd_vma) chead.cs_vaddr,
 314                                  (file_ptr) chead.cs_sseek))
 315         goto fail;
 316
 317     }
 318
 319   return abfd->xvec;
 320
 321  fail:
 322   if (abfd->tdata.any)
 323     {
 324       bfd_release (abfd, abfd->tdata.any);
 325       abfd->tdata.any = NULL;
 326     }
 327   bfd_section_list_clear (abfd);
 328   return NULL;
 329 }
 330
 331 char *
 332 sco5_core_file_failing_command (abfd)
 333      bfd *abfd;
 334 {
 335   char *com = abfd->tdata.sco5_core_data->u.u_comm;
 336   if (*com)
 337     return com;
 338   else
 339     return NULL;
 340 }
 341
 342 /* ARGSUSED */
 343 int
 344 sco5_core_file_failing_signal (ignore_abfd)
 345      bfd *ignore_abfd;
 346 {
 347   return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0)
 348           ? ignore_abfd->tdata.sco5_core_data->u.u_sysabort
 349           : -1);
 350 }
 351
 352 /* ARGSUSED */
 353 boolean
 354 sco5_core_file_matches_executable_p  (core_bfd, exec_bfd)
 355      bfd *core_bfd ATTRIBUTE_UNUSED;
 356      bfd *exec_bfd ATTRIBUTE_UNUSED;
 357 {
 358   return true;          /* FIXME, We have no way of telling at this point */
 359 }
 360
 361 /* If somebody calls any byte-swapping routines, shoot them.  */
 362 static void
 363 swap_abort ()
 364 {
 365   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 366 }
 367 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 368 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 369 #define NO_SIGNED_GET \
 370   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 371
 372 const bfd_target sco5_core_vec =
 373   {
 374     "sco5-core",
 375     bfd_target_unknown_flavour,
 376     BFD_ENDIAN_LITTLE,         /* target byte order */
 377     BFD_ENDIAN_LITTLE,         /* target headers byte order */
 378     (HAS_RELOC | EXEC_P |       /* object flags */
 379      HAS_LINENO | HAS_DEBUG |
 380      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 381     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 382     0,                                                     /* symbol prefix */
 383     ' ',                                                   /* ar_pad_char */
 384     16,                                                    /* ar_max_namelen */
 385     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 386     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 387     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 388     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 389     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 390     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 391
 392     {                           /* bfd_check_format */
 393      _bfd_dummy_target,         /* unknown format */
 394      _bfd_dummy_target,         /* object file */
 395      _bfd_dummy_target,         /* archive */
 396      sco5_core_file_p           /* a core file */
 397     },
 398     {                           /* bfd_set_format */
 399      bfd_false, bfd_false,
 400      bfd_false, bfd_false
 401     },
 402     {                           /* bfd_write_contents */
 403      bfd_false, bfd_false,
 404      bfd_false, bfd_false
 405     },
 406
 407     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 408     BFD_JUMP_TABLE_COPY (_bfd_generic),
 409     BFD_JUMP_TABLE_CORE (sco5),
 410     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 411     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 412     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 413     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 414     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 415     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 416
 417     NULL,
 418
 419     (PTR) 0                     /* backend_data */
 420 };