346 lines
11 KiB
C
346 lines
11 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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Written by Cygnus Support. Probably John Gilmore's fault.
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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., 675 Mass Ave, Cambridge, MA 02139, 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 <a.out.h>
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#include "libaout.h" /* BFD a.out internal data structures */
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#include "trad-core.h" /* Traditional Unix core files */
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/*======== This next section is stolen from ../include/a.out.gnu.h
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======== for all the losing Unix systems that don't provide these
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======== macros.
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When porting to a new system, you must supply:
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HOST_PAGE_SIZE
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HOST_SEGMENT_SIZE
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HOST_MACHINE_ARCH (optional)
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HOST_MACHINE_MACHINE (optional)
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HOST_TEXT_START_ADDR
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HOST_STACK_END_ADDR
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in the ../include/h-systemname.h file. */
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#define PAGE_SIZE HOST_PAGE_SIZE
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#define SEGMENT_SIZE HOST_SEGMENT_SIZE
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#define TEXT_START_ADDR HOST_TEXT_START_ADDR
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#define STACK_END_ADDR HOST_STACK_END_ADDR
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/*======== Stolen section begins below. =================================*/
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#define a_info a_magic /* Old traditional Unix */
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#define N_MAGIC(exec) ((exec).a_info & 0xffff)
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#define N_SET_MAGIC(exec, magic) \
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((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
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/* Virtual Address of text segment from the a.out file. For OMAGIC,
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(almost always "unlinked .o's" these days), should be zero.
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For linked files, should reflect reality if we know it. */
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#ifndef N_TXTADDR
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#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
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#endif
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#ifndef N_BADMAG
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#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
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&& N_MAGIC(x) != NMAGIC \
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&& N_MAGIC(x) != ZMAGIC)
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#endif
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/* This complexity is for encapsulated COFF support */
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#ifndef _N_HDROFF
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#define _N_HDROFF(x) (SEGMENT_SIZE - sizeof (struct exec))
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#endif
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#ifndef N_TXTOFF
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#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
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_N_HDROFF((x)) + sizeof (struct exec) : \
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sizeof (struct exec))
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#endif
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#ifndef N_DATOFF
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#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
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#endif
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#ifndef N_TRELOFF
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#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
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#endif
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#ifndef N_DRELOFF
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#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
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#endif
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#ifndef N_SYMOFF
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#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
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#endif
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#ifndef N_STROFF
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#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
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#endif
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/* Address of text segment in memory after it is loaded. */
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#ifndef N_TXTADDR
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#define N_TXTADDR(x) 0
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#endif
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#ifndef N_DATADDR
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#define N_DATADDR(x) \
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(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
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: (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))))
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#endif
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/* Address of bss segment in memory after it is loaded. */
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#ifndef N_BSSADDR
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#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
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#endif
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static bfd_target *NAME(host_aout,callback) ();
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/*SUPPRESS558*/
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/*SUPPRESS529*/
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bfd_target *
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DEFUN(NAME(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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struct external_exec exec_bytes;
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struct internal_exec exec;
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if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
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!= EXEC_BYTES_SIZE) {
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bfd_error = wrong_format;
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return 0;
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}
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exec.a_magic = bfd_h_get_32 (abfd, exec_bytes.a_magic);
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if (N_BADMAG (exec)) return 0;
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NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
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return NAME(aout,some_aout_object_p) (abfd, &exec, NAME(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 NAME(some_aout_object_p) just before it returns.
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*/
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static bfd_target *
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DEFUN(NAME(host_aout,callback), (abfd),
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bfd *abfd)
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{
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/* exec_hdr (abfd), a "struct internal_exec *", is just an abstraction,
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as far as the BFD a.out layer cares. We use it as a "struct exec *".
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This routine moves any data from the exec header,
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which is needed by the BFD code, out to places known to BFD. This
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allows the rest of the BFD code to not know or care about the structure
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of exec_hdr (abfd). */
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struct exec *execp = (struct exec *)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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bfd_default_set_arch_mach(abfd,
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HOST_MACHINE_ARCH,
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#ifdef HOST_MACHINE_MACHINE
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HOST_MACHINE_MACHINE
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#else /* not HOST_MACHINE_MACHINE */
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0
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#endif /* not HOST_MACHINE_MACHINE */
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);
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#endif /* HOST_MACHINE_ARCH */
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obj_reloc_entry_size (abfd) = sizeof (struct relocation_info);
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return abfd->xvec;
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}
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boolean
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DEFUN(NAME(host_aout,mkobject), (abfd),
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bfd *abfd)
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{
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/* This struct is just for allocating two things with one zalloc, so
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they will be freed together, without violating alignment constraints. */
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struct aout_exec {
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struct aoutdata aoutdata;
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struct exec exec;
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} *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 = (struct aout_exec *)bfd_zalloc (abfd, sizeof (struct aout_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, &rawptr->aoutdata);
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/* exec_hdr (abfd), a "struct internal_exec *", is just an abstraction,
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as far as the BFD a.out layer cares. We use it as a "struct exec *". */
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exec_hdr (abfd) = (struct internal_exec *) &rawptr->exec;
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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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DEFUN(NAME(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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#define EXTERNAL_NLIST_SIZE (sizeof (struct nlist))
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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 = (struct exec *)exec_hdr (abfd);
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execp->a_text = obj_textsec (abfd)->size;
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WRITE_HEADERS (abfd, execp);
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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_32_openr_next_archived_file bfd_generic_openr_next_archived_file
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#define aout_32_generic_stat_arch_elt bfd_generic_stat_arch_elt
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#define aout_32_slurp_armap bfd_false
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#define aout_32_slurp_extended_name_table bfd_true
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#define aout_32_write_armap (PROTO (boolean, (*), \
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(bfd *arch, unsigned int elength, struct orl *map, int orl_count, \
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int stridx))) bfd_false
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#define aout_32_truncate_arname bfd_dont_truncate_arname
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/* No core file defined here -- configure in trad-core.c separately. */
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#define aout_32_core_file_failing_command bfd_false
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#define aout_32_core_file_failing_signal bfd_false
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#define aout_32_core_file_matches_executable_p bfd_true
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#define some_kinda_core_file_p bfd_false
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#define aout_32_bfd_debug_info_start bfd_void
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#define aout_32_bfd_debug_info_end bfd_void
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#define aout_32_bfd_debug_info_accumulate (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
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#define aout_64_openr_next_archived_file aout_32_openr_next_archived_file
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#define aout_64_generic_stat_arch_elt aout_32_generic_stat_arch_elt
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#define aout_64_slurp_armap aout_32_slurp_armap
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#define aout_64_slurp_extended_name_table aout_32_slurp_extended_name_table
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#define aout_64_write_armap aout_32_write_armap
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#define aout_64_truncate_arname aout_32_truncate_arname
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#define aout_64_core_file_failing_command aout_32_core_file_failing_command
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#define aout_64_core_file_failing_signal aout_32_core_file_failing_signal
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#define aout_64_core_file_matches_executable_p aout_32_core_file_matches_executable_p
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#define aout_64_bfd_debug_info_start aout_32_bfd_debug_info_start
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#define aout_64_bfd_debug_info_end aout_32_bfd_debug_info_end
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#define aout_64_bfd_debug_info_accumulate aout_32_bfd_debug_info_accumulate
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/* We implement these routines ourselves, rather than using the generic
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a.out versions. */
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#define aout_write_object_contents host_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",
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bfd_target_aout_flavour,
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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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3, /* minimum alignment power */
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_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* data */
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_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
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{_bfd_dummy_target, NAME(host_aout,object_p),
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bfd_generic_archive_p, some_kinda_core_file_p},
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{bfd_false, NAME(host_aout,mkobject),
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, NAME(host_aout,write_object_contents), /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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JUMP_TABLE(JNAME(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",
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bfd_target_aout_flavour,
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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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3, /* minimum alignment power */
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_do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putb16, /* data */
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_do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* hdrs */
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{_bfd_dummy_target, NAME(host_aout,object_p),
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bfd_generic_archive_p, some_kinda_core_file_p},
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{bfd_false, NAME(host_aout,mkobject),
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, NAME(host_aout,write_object_contents), /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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JUMP_TABLE(JNAME(aout))
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};
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