432 lines
13 KiB
C
432 lines
13 KiB
C
/* BFD back end for SCO5 core files (U-area and raw sections)
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Copyright 1998 Free Software Foundation, Inc.
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Written by Jouke Numan <jnuman@hiscom.nl>
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "libaout.h" /* BFD a.out internal data structures */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h> /* After a.out.h */
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#include <sys/paccess.h>
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#include <sys/region.h>
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struct sco5_core_struct
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{
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struct user u;
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};
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/* forward declarations */
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static asection *
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make_bfd_asection PARAMS ((bfd *, const char *, flagword, bfd_size_type,
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bfd_vma, file_ptr));
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static asymbol *sco5_core_make_empty_symbol PARAMS ((bfd *));
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static struct user *read_uarea PARAMS ((bfd *, int));
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const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd));
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char *sco5_core_file_failing_command PARAMS ((bfd *abfd));
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int sco5_core_file_failing_signal PARAMS ((bfd *abfd));
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boolean sco5_core_file_matches_executable_p PARAMS ((bfd *core_bfd,
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bfd *exec_bfd));
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static void swap_abort PARAMS ((void));
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static asection *
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make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
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bfd *abfd;
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const char *name;
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flagword flags;
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bfd_size_type _raw_size;
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bfd_vma vma;
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file_ptr filepos;
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{
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asection *asect;
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asect = bfd_make_section_anyway (abfd, name);
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if (!asect)
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return NULL;
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asect->flags = flags;
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asect->_raw_size = _raw_size;
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asect->vma = vma;
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asect->filepos = filepos;
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asect->alignment_power = 2;
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return asect;
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}
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static asymbol *
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sco5_core_make_empty_symbol (abfd)
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bfd *abfd;
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{
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asymbol *new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
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if (new)
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new->the_bfd = abfd;
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return new;
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}
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static struct user *
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read_uarea(abfd, filepos)
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bfd *abfd;
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int filepos;
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{
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struct sco5_core_struct *rawptr;
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rawptr = ((struct sco5_core_struct *)
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bfd_zmalloc (sizeof (struct sco5_core_struct)));
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if (rawptr == NULL)
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return NULL;
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abfd->tdata.sco5_core_data = rawptr;
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if ((bfd_seek (abfd, filepos, SEEK_SET) != 0)
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|| (bfd_read ((void *)&rawptr->u, 1, sizeof rawptr->u, abfd)
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!= sizeof rawptr->u))
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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/* Sanity check perhaps??? */
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if (rawptr->u.u_dsize > 0x1000000) /* Remember, it's in pages... */
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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if (rawptr->u.u_ssize > 0x1000000)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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return &rawptr->u;
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}
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/* ARGSUSED */
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const bfd_target *
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sco5_core_file_p (abfd)
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bfd *abfd;
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{
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int coffset_siz, val, nsecs, cheadoffs;
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int coresize;
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struct user *u;
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struct coreoffsets coffsets;
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struct coresecthead chead;
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char *secname;
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flagword flags;
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/* Read coreoffsets region at end of core (see core(FP)) */
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{
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FILE *stream = bfd_cache_lookup (abfd);
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struct stat statbuf;
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if (stream == NULL)
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return NULL;
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if (fstat (fileno (stream), &statbuf) < 0)
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{
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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coresize = statbuf.st_size;
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}
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/* Last long in core is sizeof struct coreoffsets, read it */
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if ((bfd_seek (abfd, coresize-sizeof coffset_siz, SEEK_SET) != 0)
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|| (bfd_read ((void *)&coffset_siz, 1, sizeof coffset_siz, abfd)
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!= sizeof coffset_siz) )
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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/* Use it to seek start of coreoffsets region, read it and determine
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validity */
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if ((bfd_seek (abfd, coresize-coffset_siz, SEEK_SET) != 0)
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|| (bfd_read ((void *)&coffsets, 1, sizeof coffsets, abfd)
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!= sizeof coffsets)
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|| ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION)))
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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if (coffsets.u_info == 1)
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{
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/* Old version, no section heads, read info from user struct */
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u = read_uarea(abfd, coffsets.u_user);
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if (! u)
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return NULL;
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if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS,
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(bfd_size_type) coffsets.u_usize,
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0 - (bfd_vma) u->u_ar0,
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(file_ptr) coffsets.u_user))
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return NULL;
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if (!make_bfd_asection (abfd, ".data",
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SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
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((bfd_size_type) u->u_exdata.ux_dsize
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+ u->u_exdata.ux_bsize),
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(bfd_vma) u->u_exdata.ux_datorg,
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(file_ptr) coffsets.u_data))
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return NULL;
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if (!make_bfd_asection (abfd, ".stack",
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SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
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(bfd_size_type) u->u_ssize * NBPC,
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(bfd_vma) u->u_sub,
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(file_ptr) coffsets.u_stack))
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return NULL;
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return abfd->xvec; /* Done for version 1 */
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}
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/* Immediately before coreoffsets region is a long with offset in core
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to first coresecthead (CORES_OFFSETS), the long before this is the
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number of section heads in the list. Read both longs and read the
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coresecthead and check its validity */
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if ((bfd_seek (abfd,
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coresize - coffset_siz - 2 * sizeof coffset_siz,
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SEEK_SET) != 0)
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|| (bfd_read ((void *)&nsecs, 1, sizeof nsecs, abfd) != sizeof nsecs)
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|| (bfd_read ((void *)&cheadoffs, 1, sizeof cheadoffs, abfd)
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!= sizeof cheadoffs)
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|| (bfd_seek (abfd, cheadoffs, SEEK_SET) != 0)
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|| (bfd_read ((void *)&chead, 1, sizeof chead, abfd) != sizeof chead)
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|| (chead.cs_stype != CORES_OFFSETS)
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|| (chead.cs_x.csx_magic != COREMAGIC_NUMBER))
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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/* OK, we believe you. You're a core file (sure, sure). */
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/* Now loop over all regions and map them */
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nsecs--; /* We've seen CORES_OFFSETS already */
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for (; nsecs; nsecs--)
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{
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if ((bfd_seek (abfd, chead.cs_hseek, SEEK_SET) != 0)
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|| bfd_read ((void *)&chead, 1, sizeof chead, abfd) != sizeof chead)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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switch (chead.cs_stype)
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{
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case CORES_MAGIC: /* Core header, check magic */
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if (chead.cs_x.csx_magic != COREMAGIC_NUMBER)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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secname = NULL;
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nsecs++; /* MAGIC not in section cnt!*/
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break;
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case CORES_UAREA: /* U-area, read in tdata */
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u = read_uarea(abfd, chead.cs_sseek);
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if (! u)
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return NULL;
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/* This is tricky. As the "register section", we give them
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the entire upage and stack. u.u_ar0 points to where
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"register 0" is stored. There are two tricks with this,
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though. One is that the rest of the registers might be
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at positive or negative (or both) displacements from
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*u_ar0. The other is that u_ar0 is sometimes an absolute
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address in kernel memory, and on other systems it is an
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offset from the beginning of the `struct user'.
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As a practical matter, we don't know where the registers
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actually are, so we have to pass the whole area to GDB.
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We encode the value of u_ar0 by setting the .regs section
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up so that its virtual memory address 0 is at the place
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pointed to by u_ar0 (by setting the vma of the start of
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the section to -u_ar0). GDB uses this info to locate the
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regs, using minor trickery to get around the
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offset-or-absolute-addr problem. */
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chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0;
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secname = ".reg";
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flags = SEC_HAS_CONTENTS;
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break;
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case CORES_PREGION: /* A program region, map it */
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switch (chead.cs_x.csx_preg.csxp_rtyp)
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{
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case PT_DATA:
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secname = ".data"; /* Data region. */
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break;
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case PT_STACK:
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secname = ".stack"; /* Stack region. */
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break;
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case PT_SHMEM:
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secname = ".shmem"; /* Shared memory */
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break;
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case PT_LIBDAT:
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secname = ".libdat"; /* Shared library data */
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break;
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case PT_V86:
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secname = ".virt86"; /* Virtual 8086 mode */
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break;
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case PT_SHFIL:
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secname = ".mmfile"; /* Memory mapped file */
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break;
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case PT_XDATA0:
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secname = ".Xdat0"; /* XENIX data region, virtual 0 */
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break;
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default:
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secname = "";
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}
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flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
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break;
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case CORES_PROC: /* struct proc */
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case CORES_ITIMER: /* interval timers */
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case CORES_SCOUTSNAME: /* struct scoutsname */
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secname = NULL; /* Ignore these */
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break;
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default:
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(*_bfd_error_handler) ("Unhandled SCO core file section type %d\n",
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chead.cs_stype);
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continue;
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}
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if (secname
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&& !make_bfd_asection (abfd, secname, flags,
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(bfd_size_type) chead.cs_vsize,
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(bfd_vma) chead.cs_vaddr,
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(file_ptr) chead.cs_sseek))
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return NULL;
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}
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return abfd->xvec;
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}
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char *
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sco5_core_file_failing_command (abfd)
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bfd *abfd;
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{
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char *com = abfd->tdata.sco5_core_data->u.u_comm;
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if (*com)
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return com;
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else
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return NULL;
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}
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/* ARGSUSED */
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int
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sco5_core_file_failing_signal (ignore_abfd)
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bfd *ignore_abfd;
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{
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return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0)
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? ignore_abfd->tdata.sco5_core_data->u.u_sysabort
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: -1);
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}
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/* ARGSUSED */
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boolean
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sco5_core_file_matches_executable_p (core_bfd, exec_bfd)
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bfd *core_bfd, *exec_bfd;
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{
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return true; /* FIXME, We have no way of telling at this point */
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}
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#define sco5_core_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
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#define sco5_core_get_symtab _bfd_nosymbols_get_symtab
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#define sco5_core_print_symbol _bfd_nosymbols_print_symbol
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#define sco5_core_get_symbol_info _bfd_nosymbols_get_symbol_info
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#define sco5_core_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
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#define sco5_core_get_lineno _bfd_nosymbols_get_lineno
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#define sco5_core_find_nearest_line _bfd_nosymbols_find_nearest_line
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#define sco5_core_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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#define sco5_core_read_minisymbols _bfd_nosymbols_read_minisymbols
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#define sco5_core_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
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/* If somebody calls any byte-swapping routines, shoot them. */
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static void
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swap_abort()
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{
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abort(); /* This way doesn't require any declaration for ANSI to fuck up */
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}
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#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort )
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#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
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#define NO_SIGNED_GET \
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((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
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const bfd_target sco5_core_vec =
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{
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"sco5-core",
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bfd_target_unknown_flavour,
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BFD_ENDIAN_LITTLE, /* target byte order */
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BFD_ENDIAN_LITTLE, /* target headers byte order */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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0, /* symbol prefix */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */
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NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */
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{ /* bfd_check_format */
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_bfd_dummy_target, /* unknown format */
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_bfd_dummy_target, /* object file */
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_bfd_dummy_target, /* archive */
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sco5_core_file_p /* a core file */
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},
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{ /* bfd_set_format */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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{ /* bfd_write_contents */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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BFD_JUMP_TABLE_GENERIC (_bfd_generic),
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BFD_JUMP_TABLE_COPY (_bfd_generic),
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BFD_JUMP_TABLE_CORE (sco5),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (sco5_core),
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BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
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BFD_JUMP_TABLE_WRITE (_bfd_generic),
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BFD_JUMP_TABLE_LINK (_bfd_nolink),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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NULL,
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(PTR) 0 /* backend_data */
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};
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