| /* simple.c -- BFD simple client routines |
| Copyright 2002, 2003 |
| 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.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, |
| 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; |
| } |
| |
| 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 = ptr; |
| output_info[section->index].offset = section->output_offset; |
| output_info[section->index].section = section->output_section; |
| 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 = 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 all 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}. |
| |
| Generally all sections in @var{abfd} should have their |
| @code{output_section} pointing back to the original section. |
| |
| 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; |
| bfd_boolean saved_reloc_done = sec->reloc_done; |
| |
| #undef RETURN |
| #define RETURN(x) \ |
| do \ |
| { \ |
| sec->reloc_done = saved_reloc_done; \ |
| return (x); \ |
| } \ |
| while (0) |
| |
| /* Foul hack to prevent bfd_section_size aborts. The reloc_done flag |
| only controls that macro (and the related size macros), selecting |
| between _raw_size and _cooked_size. We may be called with relocation |
| done or not, so we need to save the done-flag and mark the section as |
| not relocated. |
| |
| Debug sections won't change size while we're only relocating. There |
| may be trouble here someday if it tries to run relaxation |
| unexpectedly, so make sure. */ |
| BFD_ASSERT (sec->_raw_size == sec->_cooked_size); |
| sec->reloc_done = 0; |
| |
| if (! (sec->flags & SEC_RELOC)) |
| { |
| bfd_size_type size = bfd_section_size (abfd, sec); |
| |
| if (outbuf == NULL) |
| contents = bfd_malloc (size); |
| else |
| contents = outbuf; |
| |
| if (contents) |
| bfd_get_section_contents (abfd, sec, contents, 0, size); |
| |
| 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.input_bfds = abfd; |
| |
| link_info.hash = bfd_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; |
| |
| 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 = bfd_section_size (abfd, sec); |
| link_order.u.indirect.section = sec; |
| |
| data = NULL; |
| if (outbuf == NULL) |
| { |
| data = bfd_malloc (bfd_section_size (abfd, sec)); |
| 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 emiting |
| 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 = 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); |
| |
| #if 0 |
| /* NOTE: cagney/2003-04-05: This free, which was introduced on |
| 2003-03-31 to stop a memory leak, caused a memory corruption |
| between GDB and BFD. The problem, which is stabs specific, can |
| be identified by a bunch of failures in relocate.exp vis: |
| |
| gdb.base/relocate.exp: get address of static_bar |
| |
| Details of the problem can be found on the binutils@ mailing |
| list, see the discussion thread: "gdb.mi/mi-cli.exp failures". */ |
| if (storage_needed != 0) |
| free (symbol_table); |
| #endif |
| |
| bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); |
| free (saved_offsets); |
| |
| bfd_link_hash_table_free (abfd, link_info.hash); |
| |
| RETURN (contents); |
| } |