314 lines
9.6 KiB
C
314 lines
9.6 KiB
C
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/* simple.c -- BFD simple client routines
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Copyright (C) 2002-2022 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "bfdlink.h"
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static void
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simple_dummy_add_to_set (struct bfd_link_info * info ATTRIBUTE_UNUSED,
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struct bfd_link_hash_entry *entry ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type reloc ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *sec ATTRIBUTE_UNUSED,
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bfd_vma value ATTRIBUTE_UNUSED)
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{
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}
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static void
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simple_dummy_constructor (struct bfd_link_info * info ATTRIBUTE_UNUSED,
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bool constructor ATTRIBUTE_UNUSED,
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const char *name ATTRIBUTE_UNUSED,
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bfd *abfd ATTRIBUTE_UNUSED,
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asection *sec ATTRIBUTE_UNUSED,
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bfd_vma value ATTRIBUTE_UNUSED)
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{
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}
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static void
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simple_dummy_multiple_common (struct bfd_link_info * info ATTRIBUTE_UNUSED,
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struct bfd_link_hash_entry * entry ATTRIBUTE_UNUSED,
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bfd * abfd ATTRIBUTE_UNUSED,
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enum bfd_link_hash_type type ATTRIBUTE_UNUSED,
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bfd_vma size ATTRIBUTE_UNUSED)
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{
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}
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static void
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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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}
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static void
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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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bool fatal ATTRIBUTE_UNUSED)
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{
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}
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static void
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simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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struct bfd_link_hash_entry *entry 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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}
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static void
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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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}
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static void
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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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}
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static void
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simple_dummy_multiple_definition (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
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struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED,
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bfd *nbfd ATTRIBUTE_UNUSED,
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asection *nsec ATTRIBUTE_UNUSED,
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bfd_vma nval ATTRIBUTE_UNUSED)
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{
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}
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static void
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simple_dummy_einfo (const char *fmt ATTRIBUTE_UNUSED, ...)
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{
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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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struct saved_offsets
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{
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unsigned int section_count;
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struct saved_output_info *sections;
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};
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/* The sections in ABFD may already have output sections and offsets
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set if we are here during linking.
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DWARF-2 specifies offsets into debug sections in many cases and
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bfd_simple_get_relocated_section_contents is called to relocate
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debug info for a single relocatable object file. So we want
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offsets relative to that object file's sections, not offsets in the
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output file. For that reason, reset a debug section->output_offset
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to zero.
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If not called during linking then set section->output_section to
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point back to the input section, because output_section must not be
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NULL when calling the relocation routines.
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Save the original output offset and section to restore later. */
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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_offsets *saved_offsets = (struct saved_offsets *) ptr;
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struct saved_output_info *output_info;
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output_info = &saved_offsets->sections[section->index];
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output_info->offset = section->output_offset;
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output_info->section = section->output_section;
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if ((section->flags & SEC_DEBUGGING) != 0
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|| section->output_section == NULL)
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{
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section->output_offset = 0;
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section->output_section = section;
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}
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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_offsets *saved_offsets = (struct saved_offsets *) ptr;
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struct saved_output_info *output_info;
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if (section->index >= saved_offsets->section_count)
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return;
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output_info = &saved_offsets->sections[section->index];
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section->output_offset = output_info->offset;
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section->output_section = output_info->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 debug 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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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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struct saved_offsets saved_offsets;
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bfd *link_next;
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/* Don't apply relocation on executable and shared library. See
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PR 4756. */
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if ((abfd->flags & (HAS_RELOC | EXEC_P | DYNAMIC)) != HAS_RELOC
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|| ! (sec->flags & SEC_RELOC))
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{
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contents = outbuf;
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if (!bfd_get_full_section_contents (abfd, sec, &contents))
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return NULL;
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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.output_bfd = abfd;
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link_info.input_bfds = abfd;
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link_info.input_bfds_tail = &abfd->link.next;
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link_next = abfd->link.next;
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abfd->link.next = NULL;
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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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/* Make sure that any fields not initialised below do not
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result in a potential indirection via a random address. */
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memset (&callbacks, 0, sizeof 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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callbacks.multiple_definition = simple_dummy_multiple_definition;
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callbacks.einfo = simple_dummy_einfo;
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callbacks.multiple_common = simple_dummy_multiple_common;
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callbacks.constructor = simple_dummy_constructor;
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callbacks.add_to_set = simple_dummy_add_to_set;
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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 = sec->size;
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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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bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size;
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data = (bfd_byte *) bfd_malloc (amt);
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if (data == NULL)
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{
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_bfd_generic_link_hash_table_free (abfd);
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abfd->link.next = link_next;
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return NULL;
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}
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outbuf = data;
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}
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saved_offsets.section_count = abfd->section_count;
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saved_offsets.sections = malloc (sizeof (*saved_offsets.sections)
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* saved_offsets.section_count);
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if (saved_offsets.sections == NULL)
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{
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free (data);
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_bfd_generic_link_hash_table_free (abfd);
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abfd->link.next = link_next;
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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 = (asymbol **) 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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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)
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free (data);
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bfd_map_over_sections (abfd, simple_restore_output_info, &saved_offsets);
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free (saved_offsets.sections);
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_bfd_generic_link_hash_table_free (abfd);
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abfd->link.next = link_next;
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return contents;
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}
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