258 lines
8.0 KiB
C
258 lines
8.0 KiB
C
/* simple.c -- BFD simple client routines
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Copyright 2002, 2003, 2004
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Free Software Foundation, Inc.
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Contributed by MontaVista Software, Inc.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "bfdlink.h"
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static bfd_boolean
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simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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const char *warning ATTRIBUTE_UNUSED,
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const char *symbol ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *section ATTRIBUTE_UNUSED,
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bfd_vma address ATTRIBUTE_UNUSED)
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{
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return TRUE;
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}
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static bfd_boolean
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simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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const char *name ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *section ATTRIBUTE_UNUSED,
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bfd_vma address ATTRIBUTE_UNUSED,
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bfd_boolean fatal ATTRIBUTE_UNUSED)
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{
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return TRUE;
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}
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static bfd_boolean
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simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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const char *name ATTRIBUTE_UNUSED,
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const char *reloc_name ATTRIBUTE_UNUSED,
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bfd_vma addend ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *section ATTRIBUTE_UNUSED,
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bfd_vma address ATTRIBUTE_UNUSED)
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{
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return TRUE;
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}
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static bfd_boolean
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simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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const char *message ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *section ATTRIBUTE_UNUSED,
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bfd_vma address ATTRIBUTE_UNUSED)
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{
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return TRUE;
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}
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static bfd_boolean
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simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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const char *name ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *section ATTRIBUTE_UNUSED,
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bfd_vma address ATTRIBUTE_UNUSED)
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{
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return TRUE;
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}
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struct saved_output_info
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{
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bfd_vma offset;
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asection *section;
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};
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static void
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simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED,
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asection *section,
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void *ptr)
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{
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struct saved_output_info *output_info = ptr;
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output_info[section->index].offset = section->output_offset;
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output_info[section->index].section = section->output_section;
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section->output_offset = 0;
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section->output_section = section;
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}
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static void
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simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED,
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asection *section,
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void *ptr)
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{
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struct saved_output_info *output_info = ptr;
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section->output_offset = output_info[section->index].offset;
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section->output_section = output_info[section->index].section;
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}
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/*
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FUNCTION
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bfd_simple_relocate_secton
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SYNOPSIS
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bfd_byte *bfd_simple_get_relocated_section_contents
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(bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table);
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DESCRIPTION
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Returns the relocated contents of section @var{sec}. The symbols in
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@var{symbol_table} will be used, or the symbols from @var{abfd} if
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@var{symbol_table} is NULL. The output offsets for all sections will
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be temporarily reset to 0. The result will be stored at @var{outbuf}
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or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.
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Generally all sections in @var{abfd} should have their
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@code{output_section} pointing back to the original section.
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Returns @code{NULL} on a fatal error; ignores errors applying
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particular relocations.
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*/
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bfd_byte *
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bfd_simple_get_relocated_section_contents (bfd *abfd,
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asection *sec,
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bfd_byte *outbuf,
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asymbol **symbol_table)
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{
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struct bfd_link_info link_info;
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struct bfd_link_order link_order;
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struct bfd_link_callbacks callbacks;
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bfd_byte *contents, *data;
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int storage_needed;
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void *saved_offsets;
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bfd_size_type old_cooked_size;
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if (! (sec->flags & SEC_RELOC))
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{
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bfd_size_type size = bfd_section_size (abfd, sec);
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if (outbuf == NULL)
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contents = bfd_malloc (size);
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else
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contents = outbuf;
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if (contents)
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bfd_get_section_contents (abfd, sec, contents, 0, size);
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return contents;
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}
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/* In order to use bfd_get_relocated_section_contents, we need
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to forge some data structures that it expects. */
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/* Fill in the bare minimum number of fields for our purposes. */
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memset (&link_info, 0, sizeof (link_info));
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link_info.input_bfds = abfd;
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link_info.hash = _bfd_generic_link_hash_table_create (abfd);
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link_info.callbacks = &callbacks;
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callbacks.warning = simple_dummy_warning;
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callbacks.undefined_symbol = simple_dummy_undefined_symbol;
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callbacks.reloc_overflow = simple_dummy_reloc_overflow;
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callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
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callbacks.unattached_reloc = simple_dummy_unattached_reloc;
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memset (&link_order, 0, sizeof (link_order));
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link_order.next = NULL;
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link_order.type = bfd_indirect_link_order;
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link_order.offset = 0;
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link_order.size = bfd_section_size (abfd, sec);
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link_order.u.indirect.section = sec;
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data = NULL;
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if (outbuf == NULL)
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{
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data = bfd_malloc (bfd_section_size (abfd, sec));
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if (data == NULL)
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return NULL;
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outbuf = data;
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}
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/* The sections in ABFD may already have output sections and offsets set.
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Because this function is primarily for debug sections, and GCC uses the
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knowledge that debug sections will generally have VMA 0 when emitting
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relocations between DWARF-2 sections (which are supposed to be
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section-relative offsets anyway), we need to reset the output offsets
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to zero. We also need to arrange for section->output_section->vma plus
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section->output_offset to equal section->vma, which we do by setting
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section->output_section to point back to section. Save the original
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output offset and output section to restore later. */
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saved_offsets = malloc (sizeof (struct saved_output_info)
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* abfd->section_count);
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if (saved_offsets == NULL)
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{
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if (data)
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free (data);
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return NULL;
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}
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bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets);
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if (symbol_table == NULL)
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{
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_bfd_generic_link_add_symbols (abfd, &link_info);
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storage_needed = bfd_get_symtab_upper_bound (abfd);
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symbol_table = bfd_malloc (storage_needed);
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bfd_canonicalize_symtab (abfd, symbol_table);
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}
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else
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storage_needed = 0;
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/* This function might be called before _cooked_size has been set, and
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bfd_perform_relocation needs _cooked_size to be valid. */
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old_cooked_size = sec->_cooked_size;
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if (old_cooked_size == 0)
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sec->_cooked_size = sec->_raw_size;
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contents = bfd_get_relocated_section_contents (abfd,
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&link_info,
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&link_order,
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outbuf,
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0,
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symbol_table);
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if (contents == NULL && data != NULL)
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free (data);
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#if 0
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/* NOTE: cagney/2003-04-05: This free, which was introduced on
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2003-03-31 to stop a memory leak, caused a memory corruption
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between GDB and BFD. The problem, which is stabs specific, can
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be identified by a bunch of failures in relocate.exp vis:
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gdb.base/relocate.exp: get address of static_bar
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Details of the problem can be found on the binutils@ mailing
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list, see the discussion thread: "gdb.mi/mi-cli.exp failures". */
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if (storage_needed != 0)
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free (symbol_table);
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#endif
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sec->_cooked_size = old_cooked_size;
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bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets);
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free (saved_offsets);
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_bfd_generic_link_hash_table_free (link_info.hash);
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return contents;
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}
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