540 lines
12 KiB
C
540 lines
12 KiB
C
/* obj-format for ieee-695 records.
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Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS 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, or (at your option)
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any later version.
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GAS 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 GAS; 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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/*
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created by
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steve chamberlain steve@cygnus.com
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*/
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/*
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this will hopefully become the port through which bfd and gas talk,
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for the moment, only ieee is known to work well.
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*/
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#include "bfd.h"
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#include "as.h"
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#include "subsegs.h"
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#include "output-file.h"
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#include "frags.h"
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bfd *abfd;
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/* How many addresses does the .align take? */
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static relax_addressT relax_align(address, alignment)
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register relax_addressT address; /* Address now. */
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register long alignment; /* Alignment (binary). */
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{
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relax_addressT mask;
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relax_addressT new_address;
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mask = ~ ( (~0) << alignment );
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new_address = (address + mask) & (~ mask);
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return (new_address - address);
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} /* relax_align() */
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/* calculate the size of the frag chain and create a bfd section
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to contain all of it */
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static void DEFUN(size_section,(abfd, idx),
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bfd *abfd AND
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unsigned int idx)
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{
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asection *sec;
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unsigned int size = 0;
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fragS *frag = segment_info[idx].frag_root;
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while (frag) {
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if (frag->fr_address != size) {
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printf("Out of step\n");
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size = frag->fr_address;
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}
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size += frag->fr_fix;
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switch (frag->fr_type) {
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case rs_fill:
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case rs_org:
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size += frag->fr_offset * frag->fr_var;
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break;
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case rs_align:
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size += relax_align(size, frag->fr_offset);
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}
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frag = frag->fr_next;
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}
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if (size) {
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char *name = segment_info[idx].name;
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if (name == (char *)NULL) {
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name = ".data";
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}
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segment_info[idx].user_stuff = (char *)(sec = bfd_make_section(abfd, name));
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/* Make it output through itself */
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sec->output_section = sec;
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sec->flags |= SEC_HAS_CONTENTS;
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bfd_set_section_size(abfd, sec, size);
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}
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}
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/* run through a frag chain and write out the data to go with it */
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static void DEFUN(fill_section,(abfd, idx),
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bfd *abfd AND
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unsigned int idx)
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{
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asection *sec = segment_info[idx].user_stuff;
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if (sec) {
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fragS *frag = segment_info[idx].frag_root;
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unsigned int offset = 0;
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while (frag) {
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unsigned int fill_size;
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unsigned int count;
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switch (frag->fr_type) {
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case rs_fill:
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case rs_align:
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case rs_org:
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if (frag->fr_fix)
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{
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bfd_set_section_contents(abfd,
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sec,
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frag->fr_literal,
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frag->fr_address,
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frag->fr_fix);
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}
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offset += frag->fr_fix;
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fill_size = frag->fr_var;
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if (fill_size)
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{
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unsigned int off = frag->fr_fix;
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for (count = frag->fr_offset; count; count--)
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{
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bfd_set_section_contents(abfd, sec,
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frag->fr_literal +
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frag->fr_fix,
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frag->fr_address + off,
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fill_size);
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off += fill_size;
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}
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}
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break;
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default:
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abort();
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}
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frag = frag->fr_next;
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}
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}
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}
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/* Count the relocations in a chain */
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static unsigned int DEFUN(count_entries_in_chain,(idx),
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unsigned int idx)
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{
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unsigned int nrelocs;
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fixS *fixup_ptr;
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/* Count the relocations */
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fixup_ptr = segment_info[idx].fix_root;
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nrelocs = 0;
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while (fixup_ptr != (fixS *)NULL)
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{
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fixup_ptr = fixup_ptr->fx_next;
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nrelocs ++ ;
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}
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return nrelocs;
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}
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/* output all the relocations for a section */
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void DEFUN(do_relocs_for,(idx),
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unsigned int idx)
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{
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unsigned int nrelocs;
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arelent **reloc_ptr_vector;
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arelent *reloc_vector;
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asymbol **ptrs;
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asection *section = (asection *)(segment_info[idx].user_stuff);
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unsigned int i;
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fixS *from;
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if (section) {
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nrelocs = count_entries_in_chain(idx);
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reloc_ptr_vector = (arelent**)malloc((nrelocs+1) * sizeof(arelent *));
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reloc_vector = (arelent*)malloc(nrelocs * sizeof(arelent));
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ptrs = (asymbol **)malloc(nrelocs * sizeof(asymbol *));
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from = segment_info[idx].fix_root;
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for (i = 0; i < nrelocs; i++)
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{
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arelent *to = reloc_vector + i;
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asymbol *s ;
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reloc_ptr_vector[i] = to;
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to->howto = (reloc_howto_type *)(from->fx_r_type);
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/* We can't represent complicated things in a reloc yet */
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/* if (from->fx_addsy == 0 ||
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from->fx_subsy != 0) abort();
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*/
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s = &( from->fx_addsy->sy_symbol.sy);
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to->address = ((char *)( from->fx_frag->fr_address +
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from->fx_where))
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- ((char *)(&(from->fx_frag->fr_literal)));
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to->addend = from->fx_offset ;
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/* If we know the symbol which we want to relocate to, turn this
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reloaction into a section relative.
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If this relocation is pcrelative, and we know the
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destination, we still want to keep the relocation - since
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the linker might relax some of the bytes, but it stops
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being pc relative and turns into an absolute relocation.
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*/
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if (s) {
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if ((s->flags & BSF_UNDEFINED) == 0) {
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to->section = s->section;
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to->addend += s->value ;
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to->sym_ptr_ptr = 0;
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if (to->howto->pcrel_offset) {
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/* This is a pcrel relocation, the addend should be adjusted */
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to->addend -= to->address +1;
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}
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}
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else {
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to->section = 0;
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*ptrs = &(from->fx_addsy->sy_symbol.sy);
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to->sym_ptr_ptr = ptrs;
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if (to->howto->pcrel_offset) {
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/* This is a pcrel relocation, the addend should be adjusted */
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to->addend -= to->address -1;
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}
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}
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}
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else {
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to->section = 0;
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}
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ptrs++;
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from = from->fx_next;
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}
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/* attatch to the section */
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section->orelocation = reloc_ptr_vector;
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section->reloc_count = nrelocs;
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section->flags |= SEC_LOAD;
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}
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}
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/* do the symbols.. */
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static void DEFUN(do_symbols, (abfd),
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bfd *abfd)
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{
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extern symbolS *symbol_rootP;
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symbolS *ptr;
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asymbol **symbol_ptr_vec;
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asymbol *symbol_vec;
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unsigned int count = 0;
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unsigned int index;
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for (ptr = symbol_rootP;
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ptr != (symbolS *)NULL;
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ptr = ptr->sy_next)
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{
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if (SEG_NORMAL(ptr->sy_symbol.seg))
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{
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ptr->sy_symbol.sy.section =
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(asection *)(segment_info[ptr->sy_symbol.seg].user_stuff);
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ptr->sy_symbol.sy.value += ptr->sy_frag->fr_address;
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if (ptr->sy_symbol.sy.flags == 0) {
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ptr->sy_symbol.sy.flags = BSF_LOCAL ;
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}
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}
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else {
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switch (ptr->sy_symbol.seg) {
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case SEG_ABSOLUTE:
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ptr->sy_symbol.sy.flags |= BSF_ABSOLUTE;
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ptr->sy_symbol.sy.section = 0;
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break;
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case SEG_UNKNOWN:
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ptr->sy_symbol.sy.flags = BSF_UNDEFINED ;
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ptr->sy_symbol.sy.section = 0;
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break;
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default:
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abort();
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}
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}
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count++;
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}
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symbol_ptr_vec = (asymbol **)malloc((count+1) * sizeof(asymbol *));
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index = 0;
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for (ptr = symbol_rootP;
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ptr != (symbolS *)NULL;
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ptr = ptr->sy_next)
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{
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symbol_ptr_vec[index] = &(ptr->sy_symbol.sy);
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index++;
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}
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symbol_ptr_vec[index] =0;
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abfd->outsymbols = symbol_ptr_vec;
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abfd->symcount = count;
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}
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/* The generic as->bfd converter. Other backends may have special case
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code */
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void DEFUN_VOID(bfd_as_write_hook)
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{
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int i;
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for (i = SEG_E0; i < SEG_UNKNOWN; i++) {
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size_section(abfd, i);
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}
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for (i = SEG_E0; i < SEG_UNKNOWN; i++)
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fill_section(abfd,i);
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do_symbols(abfd);
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for (i = SEG_E0; i < SEG_UNKNOWN; i++)
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do_relocs_for(i);
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}
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S_GET_VALUE(x)
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symbolS *x;
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{
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return x->sy_symbol.sy.value;
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}
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S_SET_SEGMENT(x,y)
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symbolS *x ;
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int y;
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{
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x->sy_symbol.seg = y;
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}
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S_IS_DEFINED(x)
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symbolS *x;
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{
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if (SEG_NORMAL(x->sy_symbol.seg))
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{
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return 1;
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}
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switch (x->sy_symbol.seg)
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{
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case SEG_UNKNOWN:
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return 0;
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default:
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abort();
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}
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}
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S_IS_EXTERNAL(x) { abort(); }
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S_GET_DESC(x) { abort() ; }
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S_GET_SEGMENT(x)
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symbolS *x;
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{ return x->sy_symbol.seg; }
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S_SET_EXTERNAL(x)
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symbolS *x;
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{
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x->sy_symbol.sy.flags |= BSF_GLOBAL | BSF_EXPORT;
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}
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S_SET_NAME(x,y)
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symbolS*x;
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char *y; {
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x->sy_symbol.sy.name = y; }
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S_SET_VALUE(s,v)
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symbolS *s;
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long v;
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{
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s->sy_symbol.sy.value = v;
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}
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S_GET_OTHER(x) { abort() ;}
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S_IS_DEBUG(x) { abort(); }
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char *segment_name() { abort(); }
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void obj_read_begin_hook() { }
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static void obj_ieee_section(ignore)
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int ignore;
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{
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extern char *input_line_pointer;
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extern char is_end_of_line[];
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char *p= input_line_pointer;
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char *s = p;
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int i;
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/* Look up the name, if it doesn't exist, make it */
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while (*p &&* p != ' ' && *p != ',' && !is_end_of_line[*p]) {
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p++;
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}
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for (i = SEG_E0; i < SEG_UNKNOWN; i++) {
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if (segment_info[i].hadone){
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if (strncmp(segment_info[i].name, s, p-s) == 0) {
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goto ok;
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}
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}
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else break;
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}
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if (i == SEG_UNKNOWN) {
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as_bad("too many sections");
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return;
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}
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segment_info[i].hadone = 1;
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segment_info[i].name = malloc(p-s + 1);
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memcpy(segment_info[i].name, s, p-s);
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segment_info[i].name[p-s] = 0;
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ok:
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subseg_new(i,0);
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while (!is_end_of_line[*p])
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p++;
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input_line_pointer = p;
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}
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void cons();
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void s_ignore();
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/*
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* stringer()
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*
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* We read 0 or more ',' seperated, double-quoted strings.
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*
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* Caller should have checked need_pass_2 is FALSE because we don't check it.
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*/
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void stringer();
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void s_globl();
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const pseudo_typeS obj_pseudo_table[] =
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{
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{"section", obj_ieee_section, 0},
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{"data.b", cons, 1},
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{"data.w", cons, 2},
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{"data.l", cons, 4},
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{"export", s_globl, 0},
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{"option", s_ignore, 0},
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{"end", s_ignore, 0},
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{"import", s_ignore, 0},
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{"sdata", stringer, 0},
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0,
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};
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void obj_symbol_new_hook(symbolP)
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symbolS *symbolP;
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{
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symbolP->sy_symbol.sy.the_bfd = abfd;
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}
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#if 1
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extern void DEFUN_VOID(write_object_file)
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{
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int i;
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struct frchain *frchain_ptr;
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struct frag *frag_ptr;
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abfd = bfd_openw(out_file_name, "ieee");
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if (abfd == 0) {
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as_perror ("FATAL: Can't create %s", out_file_name);
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exit(42);
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}
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bfd_set_format(abfd, bfd_object);
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bfd_set_arch_mach(abfd, bfd_arch_h8300, 0);
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subseg_new(1,0);
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subseg_new(2,0);
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subseg_new(3,0);
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for (frchain_ptr = frchain_root;
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frchain_ptr != (struct frchain *)NULL;
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frchain_ptr = frchain_ptr->frch_next) {
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/* Run through all the sub-segments and align them up. Also close any
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open frags. We tack a .fill onto the end of the frag chain so
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that any .align's size can be worked by looking at the next
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frag */
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subseg_new(frchain_ptr->frch_seg, frchain_ptr->frch_subseg);
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#define SUB_SEGMENT_ALIGN 2
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frag_align(SUB_SEGMENT_ALIGN,0);
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frag_wane(frag_now);
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frag_now->fr_fix = 0;
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know( frag_now->fr_next == NULL );
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}
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/* Now build one big frag chain for each segment, linked through
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fr_next. */
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for (i = SEG_E0; i < SEG_UNKNOWN; i++)
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{
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fragS ** prev_frag_ptr_ptr ;
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struct frchain *next_frchain_ptr;
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/* struct frag **head_ptr = segment_info[i].frag_root;*/
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segment_info[i].frag_root = segment_info[i].frchainP->frch_root;
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#if 0
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/* Im not sure what this is for */
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for (frchain_ptr = segment_info[i].frchainP->frch_root;
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frchain_ptr != (struct frchain *)NULL;
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frchain_ptr = frchain_ptr->frch_next)
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{
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*head_ptr = frchain_ptr;
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head_ptr = &frchain_ptr->next;
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}
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#endif
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}
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for (i = SEG_E0; i < SEG_UNKNOWN; i++) {
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relax_segment(segment_info[i].frag_root, i);
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}
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/* Now the addresses of the frags are correct within the segment */
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bfd_as_write_hook();
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bfd_close(abfd);
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}
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#endif
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H_SET_TEXT_SIZE(a,b) { abort(); }
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H_GET_TEXT_SIZE() { abort(); }
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H_SET_BSS_SIZE() { abort(); }
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H_SET_STRING_SIZE() { abort(); }
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H_SET_RELOCATION_SIZE() { abort(); }
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H_SET_MAGIC_NUMBER() { abort(); }
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H_GET_FILE_SIZE() { abort(); }
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H_GET_TEXT_RELOCATION_SIZE() { abort(); }
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/* end of obj-ieee.c */
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