311 lines
9.5 KiB
C
311 lines
9.5 KiB
C
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/* BFD back end for traditional Unix core files (U-area and raw sections)
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Copyright (C) 1988-2022 Free Software Foundation, Inc.
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Written by John Gilmore of Cygnus Support.
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.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 <sys/param.h>
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#include <dirent.h>
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#include <signal.h>
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#include <sys/user.h> /* After a.out.h */
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#ifdef TRAD_HEADER
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#include TRAD_HEADER
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#endif
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#ifndef NBPG
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# define NBPG getpagesize()
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#endif
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struct trad_core_struct
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{
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asection *data_section;
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asection *stack_section;
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asection *reg_section;
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struct user u;
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};
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#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
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#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
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#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
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#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
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/* forward declarations */
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#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
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#define trad_unix_core_file_pid _bfd_nocore_core_file_pid
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/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */
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static bfd_cleanup
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trad_unix_core_file_p (bfd *abfd)
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{
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int val;
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struct user u;
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struct trad_core_struct *rawptr;
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size_t amt;
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flagword flags;
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#ifdef TRAD_CORE_USER_OFFSET
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/* If defined, this macro is the file position of the user struct. */
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if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
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return 0;
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#endif
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val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
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if (val != sizeof u)
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{
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/* Too small to be a core file */
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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/* Sanity check perhaps??? */
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if (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 0;
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}
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if (u.u_ssize > 0x1000000)
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{
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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/* Check that the size claimed is no greater than the file size. */
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{
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struct stat statbuf;
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if (bfd_stat (abfd, &statbuf) < 0)
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return 0;
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if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize
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#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
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- u.u_tsize
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#endif
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+ u.u_ssize)
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> (ufile_ptr) statbuf.st_size)
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{
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
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if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize)
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#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
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/* Some systems write the file too big. */
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+ TRAD_CORE_EXTRA_SIZE_ALLOWED
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#endif
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)
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< (ufile_ptr) statbuf.st_size)
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{
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/* The file is too big. Maybe it's not a core file
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or we otherwise have bad values for u_dsize and u_ssize). */
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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#endif
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}
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/* OK, we believe you. You're a core file (sure, sure). */
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/* Allocate both the upage and the struct core_data at once, so
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a single free() will free them both. */
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amt = sizeof (struct trad_core_struct);
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rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
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if (rawptr == NULL)
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return 0;
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abfd->tdata.trad_core_data = rawptr;
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rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
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/* Create the sections. */
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flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
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core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
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flags);
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if (core_stacksec (abfd) == NULL)
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goto fail;
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core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
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flags);
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if (core_datasec (abfd) == NULL)
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goto fail;
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core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
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SEC_HAS_CONTENTS);
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if (core_regsec (abfd) == NULL)
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goto fail;
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core_datasec (abfd)->size = NBPG * u.u_dsize
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#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
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- NBPG * u.u_tsize
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#endif
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;
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core_stacksec (abfd)->size = NBPG * u.u_ssize;
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core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
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/* What a hack... we'd like to steal it from the exec file,
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since the upage does not seem to provide it. FIXME. */
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#ifdef HOST_DATA_START_ADDR
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core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
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#else
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core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
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#endif
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#ifdef HOST_STACK_START_ADDR
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core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
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#else
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core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
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#endif
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/* This is tricky. As the "register section", we give them the entire
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upage and stack. u.u_ar0 points to where "register 0" is stored.
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There are two tricks with this, though. One is that the rest of the
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registers might be at positive or negative (or both) displacements
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from *u_ar0. The other is that u_ar0 is sometimes an absolute address
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in kernel memory, and on other systems it is an offset from the beginning
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of the `struct user'.
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As a practical matter, we don't know where the registers actually are,
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so we have to pass the whole area to GDB. We encode the value of u_ar0
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by setting the .regs section up so that its virtual memory address
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0 is at the place pointed to by u_ar0 (by setting the vma of the start
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of the section to -u_ar0). GDB uses this info to locate the regs,
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using minor trickery to get around the offset-or-absolute-addr problem. */
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core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
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core_datasec (abfd)->filepos = NBPG * UPAGES;
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core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
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#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
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- NBPG * u.u_tsize
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#endif
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;
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core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
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/* Align to word at least */
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core_stacksec (abfd)->alignment_power = 2;
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core_datasec (abfd)->alignment_power = 2;
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core_regsec (abfd)->alignment_power = 2;
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return _bfd_no_cleanup;
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fail:
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bfd_release (abfd, abfd->tdata.any);
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abfd->tdata.any = NULL;
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bfd_section_list_clear (abfd);
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return NULL;
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}
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static char *
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trad_unix_core_file_failing_command (bfd *abfd)
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{
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#ifndef NO_CORE_COMMAND
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char *com = abfd->tdata.trad_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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#endif
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return 0;
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}
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static int
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trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED)
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{
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#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
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return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
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#else
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return -1; /* FIXME, where is it? */
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#endif
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}
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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 (void)
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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 (*) (const void *)) swap_abort)
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#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
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#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
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#define NO_GET64 ((uint64_t (*) (const void *)) swap_abort)
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#define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort)
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#define NO_GETS64 ((int64_t (*) (const void *)) swap_abort)
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const bfd_target core_trad_vec =
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{
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"trad-core",
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bfd_target_unknown_flavour,
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BFD_ENDIAN_UNKNOWN, /* target byte order */
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BFD_ENDIAN_UNKNOWN, /* 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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0, /* match priority. */
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TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
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NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
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NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
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NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
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NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
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NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
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NO_GET, NO_GETS, 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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trad_unix_core_file_p /* a core file */
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},
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{ /* bfd_set_format */
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error
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},
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{ /* bfd_write_contents */
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error
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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 (trad_unix),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
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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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NULL /* backend_data */
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};
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