409 lines
9.2 KiB
C
409 lines
9.2 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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GLD 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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GLD 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 GLD; 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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* $Id$
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*/
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/*
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This module writes out the final image by reading sections from the
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input files, relocating them and writing them out
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There are two main paths through this module, one for normal
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operation and one for partial linking.
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During normal operation, raw section data is read along with the
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associated relocation information, the relocation info applied and
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the section data written out on a section by section basis.
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When partially linking, all the relocation records are read to work
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out how big the output relocation vector will be. Then raw data is
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read, relocated and written section by section.
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Written by Steve Chamberlain steve@cygnus.com
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*/
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#include "sysdep.h"
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#include "bfd.h"
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#include "ldlang.h"
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#include "ld.h"
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#include "ldwrite.h"
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#include "ldmisc.h"
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#include "ldsym.h"
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#include "ldgram.tab.h"
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char *ldmalloc();
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/* Static vars for do_warnings and subroutines of it */
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int list_unresolved_refs; /* List unresolved refs */
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int list_warning_symbols; /* List warning syms */
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int list_multiple_defs; /* List multiple definitions */
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extern int errno;
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extern char *sys_errlist[];
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extern unsigned int undefined_global_sym_count;
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extern bfd *output_bfd;
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extern struct lang_output_section_statement_struct * create_object_symbols;
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extern char lprefix;
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#ifdef __STDC__
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void lang_for_each_statement(void (*func)());
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#else /* __STDC__ */
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void lang_for_each_statement();
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#endif /* __STDC__ */
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extern size_t largest_section;
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ld_config_type config;
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extern unsigned int global_symbol_count;
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boolean trace_files;
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static void perform_relocation(input_bfd,
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input_section,
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data,
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symbols)
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bfd *input_bfd;
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asection *input_section;
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PTR data;
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asymbol **symbols;
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{
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static asymbol *error_symbol = (asymbol *)NULL;
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static unsigned int error_count = 0;
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#define MAX_ERRORS_IN_A_ROW 5
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size_t reloc_size = get_reloc_upper_bound(input_bfd, input_section);
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arelent **reloc_vector = (arelent **)ldmalloc(reloc_size);
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arelent **parent;
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bfd *ob = output_bfd;
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asection *os = input_section->output_section;
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if (config.relocateable_output == false) ob = (bfd *)NULL;
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if (bfd_canonicalize_reloc(input_bfd,
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input_section,
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reloc_vector,
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symbols) )
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{
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for (parent = reloc_vector; *parent; parent++)
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{
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bfd_reloc_status_enum_type r=
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bfd_perform_relocation(input_bfd,
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*parent,
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data,
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input_section,
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ob);
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if (r == bfd_reloc_ok) {
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if (ob != (bfd *)NULL) {
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/* A parital link, so keep the relocs */
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os->orelocation[os->reloc_count] = *parent;
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os->reloc_count++;
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}
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}
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else
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{
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asymbol *s;
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arelent *p = *parent;
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if (ob != (bfd *)NULL) {
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/* A parital link, so keep the relocs */
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os->orelocation[os->reloc_count] = *parent;
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os->reloc_count++;
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}
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if (p->sym_ptr_ptr != (asymbol **)NULL) {
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s = *(p->sym_ptr_ptr);
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}
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else {
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s = (asymbol *)NULL;
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}
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switch (r)
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{
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case bfd_reloc_undefined:
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/* We remember the symbol, and never print more than
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a reasonable number of them in a row */
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if (s == error_symbol) {
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error_count++;
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}
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else {
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error_count = 0;
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error_symbol = s;
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}
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if (error_count < MAX_ERRORS_IN_A_ROW) {
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info("%C: undefined reference to `%T'\n",
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input_bfd,
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input_section,
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symbols,
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(*parent)->address,
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s);
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config.make_executable = false;
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}
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else if (error_count == MAX_ERRORS_IN_A_ROW) {
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info("%C: more undefined references to `%T' follow\n",
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input_bfd,
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input_section,
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symbols,
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(*parent)->address,
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s);
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}
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else {
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/* Don't print any more */
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}
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break;
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case bfd_reloc_dangerous:
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info("%B: relocation may be wrong `%T'\n",
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input_bfd,
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s);
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break;
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case bfd_reloc_outofrange:
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info("%B:%s relocation address out of range %T (%V)\n",
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input_bfd,
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input_section->name,
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s,
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p->address);
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break;
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case bfd_reloc_overflow:
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info("%B:%s relocation overflow in %T reloc type %d\n",
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input_bfd,
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input_section->name,
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s,
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p->howto->type);
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break;
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default:
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info("%F%B: relocation error, symbol `%T'\n",
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input_bfd,
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s);
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break;
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}
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}
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}
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}
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free((char *)reloc_vector);
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}
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PTR data_area;
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static void
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copy_and_relocate(statement)
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lang_statement_union_type *statement;
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{
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switch (statement->header.type) {
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case lang_fill_statement_enum:
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{
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#if 0
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bfd_byte play_area[SHORT_SIZE];
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unsigned int i;
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bfd_putshort(output_bfd, statement->fill_statement.fill, play_area);
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/* Write out all entire shorts */
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for (i = 0;
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i < statement->fill_statement.size - SHORT_SIZE + 1;
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i+= SHORT_SIZE)
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{
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bfd_set_section_contents(output_bfd,
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statement->fill_statement.output_section,
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play_area,
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statement->data_statement.output_offset +i,
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SHORT_SIZE);
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}
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/* Now write any remaining byte */
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if (i < statement->fill_statement.size)
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{
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bfd_set_section_contents(output_bfd,
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statement->fill_statement.output_section,
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play_area,
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statement->data_statement.output_offset +i,
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1);
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}
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#endif
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}
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break;
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case lang_data_statement_enum:
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{
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bfd_vma value = statement->data_statement.value;
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bfd_byte play_area[LONG_SIZE];
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unsigned int size;
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switch (statement->data_statement.type) {
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case LONG:
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bfd_putlong(output_bfd, value, play_area);
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size = LONG_SIZE;
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break;
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case SHORT:
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bfd_putshort(output_bfd, value, play_area);
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size = SHORT_SIZE;
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break;
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case BYTE:
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bfd_putchar(output_bfd, value, play_area);
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size = BYTE_SIZE;
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break;
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}
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bfd_set_section_contents(output_bfd,
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statement->data_statement.output_section,
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play_area,
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statement->data_statement.output_vma,
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size);
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}
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break;
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case lang_input_section_enum:
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{
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asection *i = statement->input_section.section;
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asection *output_section = i->output_section;
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lang_input_statement_type *ifile =
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statement->input_section.ifile;
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if (ifile->just_syms_flag == false) {
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bfd *inbfd = ifile->the_bfd;
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if (output_section->flags & SEC_LOAD && i->size != 0)
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{
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if(bfd_get_section_contents(inbfd,
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i,
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data_area,
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0L,
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i->size) == false)
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{
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info("%F%B error reading section contents %E\n",
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inbfd);
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}
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perform_relocation (inbfd, i, data_area, ifile->asymbols);
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if(bfd_set_section_contents(output_bfd,
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output_section,
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data_area,
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(file_ptr)i->output_offset,
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i->size) == false)
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{
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info("%F%B error writing section contents of %E\n",
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output_bfd);
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}
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}
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}
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}
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break;
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default:
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/* All the other ones fall through */
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;
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}
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}
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void
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write_norel()
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{
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/* Output the text and data segments, relocating as we go. */
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lang_for_each_statement(copy_and_relocate);
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}
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static void read_relocs(abfd, section, symbols)
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bfd *abfd;
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asection *section;
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asymbol **symbols;
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{
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/* Work out the output section ascociated with this input section */
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asection *output_section = section->output_section;
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size_t reloc_size = get_reloc_upper_bound(abfd, section);
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arelent **reloc_vector = (arelent **)ldmalloc(reloc_size);
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if (bfd_canonicalize_reloc(abfd,
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section,
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reloc_vector,
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symbols)) {
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output_section->reloc_count += section->reloc_count;
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}
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}
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static void
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write_rel()
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{
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/*
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Run through each section of each file and work work out the total
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number of relocation records which will finally be in each output
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section
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*/
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LANG_FOR_EACH_INPUT_SECTION
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(statement, abfd, section,
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(read_relocs(abfd, section, statement->asymbols)));
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/*
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Now run though all the output sections and allocate the space for
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all the relocations
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*/
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LANG_FOR_EACH_OUTPUT_SECTION
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(section,
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(section->orelocation =
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(arelent **)ldmalloc((size_t)(sizeof(arelent **)*
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section->reloc_count)),
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section->reloc_count = 0,
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section->flags |= SEC_HAS_CONTENTS));
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/*
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Copy the data, relocating as we go
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*/
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lang_for_each_statement(copy_and_relocate);
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}
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void
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ldwrite ()
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{
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data_area = (PTR) ldmalloc(largest_section);
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if (config.relocateable_output == true)
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{
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write_rel();
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}
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else
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{
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write_norel();
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}
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free(data_area);
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/* Output the symbol table (both globals and locals). */
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ldsym_write ();
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}
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