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Diffstat (limited to 'binutils-2.25/bfd/simple.c')
| -rw-r--r-- | binutils-2.25/bfd/simple.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/simple.c b/binutils-2.25/bfd/simple.c new file mode 100644 index 00000000..e5a5b58f --- /dev/null +++ b/binutils-2.25/bfd/simple.c @@ -0,0 +1,253 @@ +/* simple.c -- BFD simple client routines + Copyright 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 + Free Software Foundation, Inc. + Contributed by MontaVista Software, Inc. + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "bfdlink.h" + +static bfd_boolean +simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + const char *warning ATTRIBUTE_UNUSED, + const char *symbol ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *section ATTRIBUTE_UNUSED, + bfd_vma address ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static bfd_boolean +simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + const char *name ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *section ATTRIBUTE_UNUSED, + bfd_vma address ATTRIBUTE_UNUSED, + bfd_boolean fatal ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static bfd_boolean +simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + struct bfd_link_hash_entry *entry ATTRIBUTE_UNUSED, + const char *name ATTRIBUTE_UNUSED, + const char *reloc_name ATTRIBUTE_UNUSED, + bfd_vma addend ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *section ATTRIBUTE_UNUSED, + bfd_vma address ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static bfd_boolean +simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + const char *message ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *section ATTRIBUTE_UNUSED, + bfd_vma address ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static bfd_boolean +simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + const char *name ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *section ATTRIBUTE_UNUSED, + bfd_vma address ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static bfd_boolean +simple_dummy_multiple_definition (struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED, + bfd *nbfd ATTRIBUTE_UNUSED, + asection *nsec ATTRIBUTE_UNUSED, + bfd_vma nval ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +static void +simple_dummy_einfo (const char *fmt ATTRIBUTE_UNUSED, ...) +{ +} + +struct saved_output_info +{ + bfd_vma offset; + asection *section; +}; + +static void +simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED, + asection *section, + void *ptr) +{ + struct saved_output_info *output_info = (struct saved_output_info *) ptr; + output_info[section->index].offset = section->output_offset; + output_info[section->index].section = section->output_section; + if ((section->flags & SEC_DEBUGGING) != 0 + || section->output_section == NULL) + { + section->output_offset = 0; + section->output_section = section; + } +} + +static void +simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED, + asection *section, + void *ptr) +{ + struct saved_output_info *output_info = (struct saved_output_info *) ptr; + section->output_offset = output_info[section->index].offset; + section->output_section = output_info[section->index].section; +} + +/* +FUNCTION + bfd_simple_relocate_secton + +SYNOPSIS + bfd_byte *bfd_simple_get_relocated_section_contents + (bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table); + +DESCRIPTION + Returns the relocated contents of section @var{sec}. The symbols in + @var{symbol_table} will be used, or the symbols from @var{abfd} if + @var{symbol_table} is NULL. The output offsets for debug sections will + be temporarily reset to 0. The result will be stored at @var{outbuf} + or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}. + + Returns @code{NULL} on a fatal error; ignores errors applying + particular relocations. +*/ + +bfd_byte * +bfd_simple_get_relocated_section_contents (bfd *abfd, + asection *sec, + bfd_byte *outbuf, + asymbol **symbol_table) +{ + struct bfd_link_info link_info; + struct bfd_link_order link_order; + struct bfd_link_callbacks callbacks; + bfd_byte *contents, *data; + int storage_needed; + void *saved_offsets; + + /* Don't apply relocation on executable and shared library. See + PR 4756. */ + if ((abfd->flags & (HAS_RELOC | EXEC_P | DYNAMIC)) != HAS_RELOC + || ! (sec->flags & SEC_RELOC)) + { + contents = outbuf; + if (!bfd_get_full_section_contents (abfd, sec, &contents)) + return NULL; + return contents; + } + + /* In order to use bfd_get_relocated_section_contents, we need + to forge some data structures that it expects. */ + + /* Fill in the bare minimum number of fields for our purposes. */ + memset (&link_info, 0, sizeof (link_info)); + link_info.output_bfd = abfd; + link_info.input_bfds = abfd; + link_info.input_bfds_tail = &abfd->link_next; + + link_info.hash = _bfd_generic_link_hash_table_create (abfd); + link_info.callbacks = &callbacks; + callbacks.warning = simple_dummy_warning; + callbacks.undefined_symbol = simple_dummy_undefined_symbol; + callbacks.reloc_overflow = simple_dummy_reloc_overflow; + callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; + callbacks.unattached_reloc = simple_dummy_unattached_reloc; + callbacks.multiple_definition = simple_dummy_multiple_definition; + callbacks.einfo = simple_dummy_einfo; + + memset (&link_order, 0, sizeof (link_order)); + link_order.next = NULL; + link_order.type = bfd_indirect_link_order; + link_order.offset = 0; + link_order.size = sec->size; + link_order.u.indirect.section = sec; + + data = NULL; + if (outbuf == NULL) + { + bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size; + data = (bfd_byte *) bfd_malloc (amt); + if (data == NULL) + return NULL; + outbuf = data; + } + + /* The sections in ABFD may already have output sections and offsets set. + Because this function is primarily for debug sections, and GCC uses the + knowledge that debug sections will generally have VMA 0 when emitting + relocations between DWARF-2 sections (which are supposed to be + section-relative offsets anyway), we need to reset the output offsets + to zero. We also need to arrange for section->output_section->vma plus + section->output_offset to equal section->vma, which we do by setting + section->output_section to point back to section. Save the original + output offset and output section to restore later. */ + saved_offsets = malloc (sizeof (struct saved_output_info) + * abfd->section_count); + if (saved_offsets == NULL) + { + if (data) + free (data); + return NULL; + } + bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets); + + if (symbol_table == NULL) + { + _bfd_generic_link_add_symbols (abfd, &link_info); + + storage_needed = bfd_get_symtab_upper_bound (abfd); + symbol_table = (asymbol **) bfd_malloc (storage_needed); + bfd_canonicalize_symtab (abfd, symbol_table); + } + else + storage_needed = 0; + + contents = bfd_get_relocated_section_contents (abfd, + &link_info, + &link_order, + outbuf, + 0, + symbol_table); + if (contents == NULL && data != NULL) + free (data); + + bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); + free (saved_offsets); + + _bfd_generic_link_hash_table_free (link_info.hash); + return contents; +} |