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271 lines
8.1 KiB
C
271 lines
8.1 KiB
C
/* BFD backend for local host's a.out binaries */
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/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Diddler.
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BFD 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 1, or (at your option)
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any later version.
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BFD 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 BFD; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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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 <a.out.h>
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#include "liba.out.h" /* BFD a.out internal data structures */
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#include "trad-core.h" /* Traditional Unix core files */
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void (*bfd_error_trap)();
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static bfd_target *host_aout_callback ();
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/*SUPPRESS558*/
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/*SUPPRESS529*/
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bfd_target *
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host_aout_object_p (abfd)
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bfd *abfd;
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{
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unsigned char magicbuf[4]; /* Raw bytes of magic number from file */
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unsigned long magic; /* Swapped magic number */
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bfd_error = system_call_error;
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if (bfd_read ((PTR)magicbuf, 1, sizeof (magicbuf), abfd) !=
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sizeof (magicbuf))
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return 0;
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magic = bfd_h_getlong (abfd, magicbuf);
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if (N_BADMAG (*((struct exec *) &magic))) return 0;
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return some_aout_object_p (abfd, host_aout_callback);
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}
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/* Set parameters about this a.out file that are machine-dependent.
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This routine is called from some_aout_object_p just before it returns. */
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static bfd_target *
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host_aout_callback (abfd)
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bfd *abfd;
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{
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struct exec *execp = exec_hdr (abfd);
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/* The virtual memory addresses of the sections */
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obj_datasec (abfd)->vma = N_DATADDR(*execp);
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obj_bsssec (abfd)->vma = N_BSSADDR(*execp);
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obj_textsec (abfd)->vma = N_TXTADDR(*execp);
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/* The file offsets of the sections */
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obj_textsec (abfd)->filepos = N_TXTOFF(*execp);
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obj_datasec (abfd)->filepos = N_DATOFF(*execp);
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/* The file offsets of the relocation info */
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obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp);
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obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp);
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/* The file offsets of the string table and symbol table. */
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obj_str_filepos (abfd) = N_STROFF (*execp);
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obj_sym_filepos (abfd) = N_SYMOFF (*execp);
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#ifdef HOST_MACHINE_ARCH
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abfd->obj_arch = HOST_MACHINE_ARCH;
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#endif
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#ifdef HOST_MACHINE_MACHINE
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abfd->obj_machine = HOST_MACHINE_MACHINE;
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#endif
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return abfd->xvec;
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}
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boolean
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host_aout_mkobject (abfd)
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bfd *abfd;
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{
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char *rawptr;
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bfd_error = system_call_error;
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/* Use an intermediate variable for clarity */
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rawptr = bfd_zalloc (abfd, sizeof (struct aoutdata) + sizeof (struct exec));
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if (rawptr == NULL) {
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bfd_error = no_memory;
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return false;
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}
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set_tdata (abfd, (struct aoutdata *) rawptr);
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exec_hdr (abfd) = (struct exec *) (rawptr + sizeof (struct aoutdata));
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/* For simplicity's sake we just make all the sections right here. */
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obj_textsec (abfd) = (asection *)NULL;
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obj_datasec (abfd) = (asection *)NULL;
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obj_bsssec (abfd) = (asection *)NULL;
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bfd_make_section (abfd, ".text");
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bfd_make_section (abfd, ".data");
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bfd_make_section (abfd, ".bss");
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return true;
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}
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/* Write an object file in host a.out format.
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Section contents have already been written. We write the
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file header, symbols, and relocation. */
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boolean
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host_aout_write_object_contents (abfd)
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bfd *abfd;
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{
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/* This works because we are on the host system */
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#define EXEC_BYTES_SIZE sizeof (struct exec)
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size_t data_pad = 0;
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unsigned char exec_bytes[EXEC_BYTES_SIZE];
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struct exec *execp = exec_hdr (abfd);
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execp->a_text = obj_textsec (abfd)->size;
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N_SET_MAGIC (*execp, OMAGIC);
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if (abfd->flags & D_PAGED) {
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/* This is not strictly true, but will probably do for the default
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case. FIXME.
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*/
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execp->a_text = obj_textsec (abfd)->size + EXEC_BYTES_SIZE;
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N_SET_MAGIC (*execp, ZMAGIC);
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} else if (abfd->flags & WP_TEXT) {
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N_SET_MAGIC (*execp, NMAGIC);
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}
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N_SET_FLAGS (*execp, 0x1); /* copied from ld.c; who the hell knows? */
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if (abfd->flags & D_PAGED)
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{
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data_pad = ((obj_datasec(abfd)->size + PAGE_SIZE -1)
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& (- PAGE_SIZE)) - obj_datasec(abfd)->size;
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if (data_pad > obj_bsssec(abfd)->size)
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execp->a_bss = 0;
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else
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execp->a_bss = obj_bsssec(abfd)->size - data_pad;
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execp->a_data = obj_datasec(abfd)->size + data_pad;
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}
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else {
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execp->a_data = obj_datasec (abfd)->size;
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execp->a_bss = obj_bsssec (abfd)->size;
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}
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execp->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
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execp->a_entry = bfd_get_start_address (abfd);
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execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *
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obj_reloc_entry_size (abfd));
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execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *
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obj_reloc_entry_size (abfd));
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bfd_aout_swap_exec_header_out (abfd, execp, exec_bytes);
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bfd_seek (abfd, 0L, false);
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bfd_write ((PTR) exec_bytes, 1, EXEC_BYTES_SIZE, abfd);
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/* Now write out reloc info, followed by syms and strings */
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if (bfd_get_symcount (abfd) != 0)
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{
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bfd_seek (abfd,
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(long)(N_SYMOFF(*execp)), false);
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aout_write_syms (abfd);
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bfd_seek (abfd, (long)(N_TRELOFF(*execp)), false);
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if (!aout_squirt_out_relocs (abfd, obj_textsec (abfd))) return false;
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bfd_seek (abfd, (long)(N_DRELOFF(*execp)), false);
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if (!aout_squirt_out_relocs (abfd, obj_datasec (abfd))) return false;
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}
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return true;
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}
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/* We use BFD generic archive files. */
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#define aout_openr_next_archived_file bfd_generic_openr_next_archived_file
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#define aout_generic_stat_arch_elt bfd_generic_stat_arch_elt
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#define aout_slurp_armap bfd_slurp_bsd_armap
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#define aout_slurp_extended_name_table bfd_true
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#define aout_write_armap bsd_write_armap
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#define aout_truncate_arname bfd_bsd_truncate_arname
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/* We use traditional Unix core file format. */
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#define aout_core_file_failing_command trad_unix_core_file_failing_command
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#define aout_core_file_failing_signal trad_unix_core_file_failing_signal
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#define aout_core_file_matches_executable_p \
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trad_unix_core_file_matches_executable_p
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/* We replace this function */
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#define aout_write_object_contents host_aout_write_object_contents
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bfd_target host_aout_big_vec =
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{
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"a.out-host-big", /* name */
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bfd_target_aout_flavour_enum,
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true, /* target byte order */
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true, /* 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 | DYNAMIC | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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_do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* data */
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_do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* hdrs */
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{_bfd_dummy_target, host_aout_object_p,
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bfd_generic_archive_p, trad_unix_core_file_p},
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{bfd_false, host_aout_mkobject,
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, aout_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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JUMP_TABLE(aout)
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};
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bfd_target host_aout_little_vec =
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{
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"a.out-host-little", /* name */
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bfd_target_aout_flavour_enum,
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false, /* target byte order */
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false, /* 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 | DYNAMIC | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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_do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* data */
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_do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* hdrs */
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{_bfd_dummy_target, host_aout_object_p,
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bfd_generic_archive_p, trad_unix_core_file_p},
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{bfd_false, host_aout_mkobject,
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, aout_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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JUMP_TABLE(aout)
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};
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