old-cross-binutils/bfd/host-aout.c

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/* BFD backend for local host's a.out binaries
Copyright (C) 1990-1991 Free Software Foundation, Inc.
Written by Cygnus Support. Probably John Gilmore's fault.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include <a.out.h>
#include "libaout.h" /* BFD a.out internal data structures */
#include "trad-core.h" /* Traditional Unix core files */
/*======== This next section is stolen from ../include/a.out.gnu.h
======== for all the losing Unix systems that don't provide these
======== macros.
When porting to a new system, you must supply:
HOST_PAGE_SIZE
HOST_SEGMENT_SIZE
HOST_MACHINE_ARCH (optional)
HOST_MACHINE_MACHINE (optional)
HOST_TEXT_START_ADDR
HOST_STACK_END_ADDR
in the ../include/h-systemname.h file. */
#define PAGE_SIZE HOST_PAGE_SIZE
#define SEGMENT_SIZE HOST_SEGMENT_SIZE
#define TEXT_START_ADDR HOST_TEXT_START_ADDR
#define STACK_END_ADDR HOST_STACK_END_ADDR
/*======== Stolen section begins below. =================================*/
#define a_info a_magic /* Old traditional Unix */
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define N_SET_MAGIC(exec, magic) \
((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
/* Virtual Address of text segment from the a.out file. For OMAGIC,
(almost always "unlinked .o's" these days), should be zero.
For linked files, should reflect reality if we know it. */
#ifndef N_TXTADDR
#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
#endif
#ifndef N_BADMAG
#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
&& N_MAGIC(x) != NMAGIC \
&& N_MAGIC(x) != ZMAGIC)
#endif
/* This complexity is for encapsulated COFF support */
#ifndef _N_HDROFF
#define _N_HDROFF(x) (SEGMENT_SIZE - sizeof (struct exec))
#endif
#ifndef N_TXTOFF
#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
_N_HDROFF((x)) + sizeof (struct exec) : \
sizeof (struct exec))
#endif
#ifndef N_DATOFF
#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
#endif
#ifndef N_TRELOFF
#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
#endif
#ifndef N_DRELOFF
#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
#endif
#ifndef N_SYMOFF
#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
#endif
#ifndef N_STROFF
#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
#endif
/* Address of text segment in memory after it is loaded. */
#ifndef N_TXTADDR
#define N_TXTADDR(x) 0
#endif
#ifndef N_DATADDR
#define N_DATADDR(x) \
(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
: (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))))
#endif
/* Address of bss segment in memory after it is loaded. */
#ifndef N_BSSADDR
#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
#endif
static bfd_target *NAME(host_aout,callback) ();
/*SUPPRESS558*/
/*SUPPRESS529*/
bfd_target *
DEFUN(NAME(host_aout,object_p), (abfd),
bfd *abfd)
{
unsigned char magicbuf[4]; /* Raw bytes of magic number from file */
struct external_exec exec_bytes;
struct internal_exec exec;
if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
!= EXEC_BYTES_SIZE) {
bfd_error = wrong_format;
return 0;
}
exec.a_magic = bfd_h_get_32 (abfd, exec_bytes.a_magic);
if (N_BADMAG (exec)) return 0;
NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
return NAME(aout,some_aout_object_p) (abfd, &exec, NAME(host_aout,callback));
}
/* Set parameters about this a.out file that are machine-dependent.
This routine is called from NAME(some_aout_object_p) just before it returns.
*/
static bfd_target *
DEFUN(NAME(host_aout,callback), (abfd),
bfd *abfd)
{
/* exec_hdr (abfd), a "struct internal_exec *", is just an abstraction,
as far as the BFD a.out layer cares. We use it as a "struct exec *".
This routine moves any data from the exec header,
which is needed by the BFD code, out to places known to BFD. This
allows the rest of the BFD code to not know or care about the structure
of exec_hdr (abfd). */
struct exec *execp = (struct exec *)exec_hdr (abfd);
/* The virtual memory addresses of the sections */
obj_datasec (abfd)->vma = N_DATADDR(*execp);
obj_bsssec (abfd)->vma = N_BSSADDR(*execp);
obj_textsec (abfd)->vma = N_TXTADDR(*execp);
/* The file offsets of the sections */
obj_textsec (abfd)->filepos = N_TXTOFF(*execp);
obj_datasec (abfd)->filepos = N_DATOFF(*execp);
/* The file offsets of the relocation info */
obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp);
obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp);
/* The file offsets of the string table and symbol table. */
obj_str_filepos (abfd) = N_STROFF (*execp);
obj_sym_filepos (abfd) = N_SYMOFF (*execp);
#ifdef HOST_MACHINE_ARCH
bfd_default_set_arch_mach(abfd,
HOST_MACHINE_ARCH,
#ifdef HOST_MACHINE_MACHINE
HOST_MACHINE_MACHINE
#else /* not HOST_MACHINE_MACHINE */
0
#endif /* not HOST_MACHINE_MACHINE */
);
#endif /* HOST_MACHINE_ARCH */
obj_reloc_entry_size (abfd) = sizeof (struct relocation_info);
return abfd->xvec;
}
boolean
DEFUN(NAME(host_aout,mkobject), (abfd),
bfd *abfd)
{
/* This struct is just for allocating two things with one zalloc, so
they will be freed together, without violating alignment constraints. */
struct aout_exec {
struct aoutdata aoutdata;
struct exec exec;
} *rawptr;
bfd_error = system_call_error;
/* Use an intermediate variable for clarity */
rawptr = (struct aout_exec *)bfd_zalloc (abfd, sizeof (struct aout_exec));
if (rawptr == NULL) {
bfd_error = no_memory;
return false;
}
set_tdata (abfd, &rawptr->aoutdata);
/* exec_hdr (abfd), a "struct internal_exec *", is just an abstraction,
as far as the BFD a.out layer cares. We use it as a "struct exec *". */
exec_hdr (abfd) = (struct internal_exec *) &rawptr->exec;
/* For simplicity's sake we just make all the sections right here. */
obj_textsec (abfd) = (asection *)NULL;
obj_datasec (abfd) = (asection *)NULL;
obj_bsssec (abfd) = (asection *)NULL;
bfd_make_section (abfd, ".text");
bfd_make_section (abfd, ".data");
bfd_make_section (abfd, ".bss");
return true;
}
/* Write an object file in host a.out format.
Section contents have already been written. We write the
file header, symbols, and relocation. */
boolean
DEFUN(NAME(host_aout,write_object_contents), (abfd),
bfd *abfd)
{
/* This works because we are on the host system */
#define EXEC_BYTES_SIZE (sizeof (struct exec))
#define EXTERNAL_NLIST_SIZE (sizeof (struct nlist))
size_t data_pad = 0;
unsigned char exec_bytes[EXEC_BYTES_SIZE];
struct exec *execp = (struct exec *)exec_hdr (abfd);
execp->a_text = obj_textsec (abfd)->size;
WRITE_HEADERS (abfd, execp);
return true;
}
/* We use BFD generic archive files. */
#define aout_32_openr_next_archived_file bfd_generic_openr_next_archived_file
#define aout_32_generic_stat_arch_elt bfd_generic_stat_arch_elt
#define aout_32_slurp_armap bfd_false
#define aout_32_slurp_extended_name_table bfd_true
#define aout_32_write_armap (PROTO (boolean, (*), \
(bfd *arch, unsigned int elength, struct orl *map, int orl_count, \
int stridx))) bfd_false
#define aout_32_truncate_arname bfd_dont_truncate_arname
/* No core file defined here -- configure in trad-core.c separately. */
#define aout_32_core_file_failing_command bfd_false
#define aout_32_core_file_failing_signal bfd_false
#define aout_32_core_file_matches_executable_p bfd_true
#define some_kinda_core_file_p bfd_false
#define aout_32_bfd_debug_info_start bfd_void
#define aout_32_bfd_debug_info_end bfd_void
#define aout_32_bfd_debug_info_accumulate (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
#define aout_64_openr_next_archived_file aout_32_openr_next_archived_file
#define aout_64_generic_stat_arch_elt aout_32_generic_stat_arch_elt
#define aout_64_slurp_armap aout_32_slurp_armap
#define aout_64_slurp_extended_name_table aout_32_slurp_extended_name_table
#define aout_64_write_armap aout_32_write_armap
#define aout_64_truncate_arname aout_32_truncate_arname
#define aout_64_core_file_failing_command aout_32_core_file_failing_command
#define aout_64_core_file_failing_signal aout_32_core_file_failing_signal
#define aout_64_core_file_matches_executable_p aout_32_core_file_matches_executable_p
#define aout_64_bfd_debug_info_start aout_32_bfd_debug_info_start
#define aout_64_bfd_debug_info_end aout_32_bfd_debug_info_end
#define aout_64_bfd_debug_info_accumulate aout_32_bfd_debug_info_accumulate
/* We implement these routines ourselves, rather than using the generic
a.out versions. */
#define aout_write_object_contents host_write_object_contents
bfd_target host_aout_big_vec =
{
"a.out-host-big",
bfd_target_aout_flavour,
true, /* target byte order */
true, /* target headers byte order */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
' ', /* ar_pad_char */
16, /* ar_max_namelen */
3, /* minimum alignment power */
_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* data */
_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
{_bfd_dummy_target, NAME(host_aout,object_p),
bfd_generic_archive_p, some_kinda_core_file_p},
{bfd_false, NAME(host_aout,mkobject),
_bfd_generic_mkarchive, bfd_false},
{bfd_false, NAME(host_aout,write_object_contents), /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
JUMP_TABLE(JNAME(aout))
};
bfd_target host_aout_little_vec =
{
"a.out-host-little",
bfd_target_aout_flavour,
false, /* target byte order */
false, /* target headers byte order */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
' ', /* ar_pad_char */
16, /* ar_max_namelen */
3, /* minimum alignment power */
_do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putb16, /* data */
_do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* hdrs */
{_bfd_dummy_target, NAME(host_aout,object_p),
bfd_generic_archive_p, some_kinda_core_file_p},
{bfd_false, NAME(host_aout,mkobject),
_bfd_generic_mkarchive, bfd_false},
{bfd_false, NAME(host_aout,write_object_contents), /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
JUMP_TABLE(JNAME(aout))
};