561 lines
17 KiB
Text
561 lines
17 KiB
Text
# This shell script emits a C file. -*- C -*-
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# Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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#
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# This file is part of GLD, the Gnu Linker.
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#
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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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#
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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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#
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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, MA 02110-1301, USA.
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#
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# This file is sourced from elf32.em, and defines extra sh64
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# specific routines.
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#
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LDEMUL_AFTER_ALLOCATION=sh64_elf_${EMULATION_NAME}_after_allocation
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LDEMUL_BEFORE_ALLOCATION=sh64_elf_${EMULATION_NAME}_before_allocation
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "libiberty.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/sh.h"
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#include "elf32-sh64.h"
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/* Check if we need a .cranges section and create it if it's not in any
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input file. It might seem better to always create it and if unneeded,
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discard it, but I don't find a simple way to discard it totally from
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the output.
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Putting it here instead of as a elf_backend_always_size_sections hook
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in elf32-sh64.c, means that we have access to linker command line
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options here, and we can access input sections in the order in which
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they will be linked. */
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static void
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sh64_elf_${EMULATION_NAME}_before_allocation (void)
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{
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asection *cranges;
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asection *osec;
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/* Call main function; we're just extending it. */
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gld${EMULATION_NAME}_before_allocation ();
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cranges = bfd_get_section_by_name (output_bfd, SH64_CRANGES_SECTION_NAME);
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if (cranges != NULL)
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{
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if (command_line.relax)
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{
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/* FIXME: Look through incoming sections with .cranges
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descriptors, build up some kind of descriptors that the
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relaxing function will pick up and adjust, or perhaps make it
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find and adjust an associated .cranges descriptor. We could
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also look through incoming relocs and kill the ones marking
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relaxation areas, but that wouldn't be TRT. */
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einfo
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(_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
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einfo (_(" A .cranges section is present in:\n"));
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *input_cranges
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= bfd_get_section_by_name (f->the_bfd,
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SH64_CRANGES_SECTION_NAME);
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if (input_cranges != NULL)
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einfo (" %I\n", f);
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}
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}
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command_line.relax = FALSE;
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}
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/* We wouldn't need to do anything when there's already a .cranges
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section (and have a return here), except that we need to set the
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section flags right for output sections that *don't* need a
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.cranges section. */
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}
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if (command_line.relax)
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
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{
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einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
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einfo (" %I\n", f);
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command_line.relax = FALSE;
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goto done_scanning_shmedia_sections;
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}
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}
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}
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}
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}
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done_scanning_shmedia_sections:
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/* For each non-empty input section in each output section, check if it
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has the same SH64-specific flags. If some input section differs, we
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need a .cranges section. */
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for (osec = output_bfd->sections;
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osec != NULL;
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osec = osec->next)
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{
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struct sh64_section_data *sh64_sec_data;
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bfd_vma oflags_isa = 0;
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bfd_vma iflags_isa = 0;
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if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
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einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
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sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
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/* Omit excluded or garbage-collected sections. */
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if (bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE)
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continue;
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/* Make sure we have the target section data initialized. */
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if (sh64_sec_data == NULL)
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{
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sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
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sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
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}
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/* First find an input section so we have flags to compare with; the
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flags in the output section are not valid. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0)
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{
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oflags_isa
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= (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
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goto break_1;
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}
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}
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}
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}
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break_1:
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/* Check that all input sections have the same contents-type flags
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as the first input section. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0)
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{
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iflags_isa
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= (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
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/* If flags don't agree, we need a .cranges section.
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Create it here if it did not exist through input
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sections. */
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if (iflags_isa != oflags_isa)
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{
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if (cranges == NULL)
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{
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/* This section will be *appended* to
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sections, so the outer iteration will reach
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it in due time and set
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sh64_elf_section_data; no need to set it
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specifically here. */
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cranges
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= bfd_make_section (output_bfd,
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SH64_CRANGES_SECTION_NAME);
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if (cranges == NULL
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|| !bfd_set_section_flags (output_bfd,
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cranges,
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SEC_LINKER_CREATED
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| SEC_KEEP
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| SEC_HAS_CONTENTS
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| SEC_DEBUGGING))
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einfo
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(_("%P%E%F: Can't make .cranges section\n"));
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}
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/* We don't need to look at more input sections,
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and we know this section will have mixed
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contents. */
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goto break_2;
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}
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}
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}
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}
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}
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/* If we got here, then all input sections in this output section
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have the same contents flag. Put that where we expect to see
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contents flags. We don't need to do this for sections that will
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need additional, linker-generated .cranges entries. */
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sh64_sec_data->contents_flags = iflags_isa;
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break_2:
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;
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}
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}
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/* Size up and extend the .cranges section, merging generated entries. */
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static void
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sh64_elf_${EMULATION_NAME}_after_allocation (void)
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{
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bfd_vma new_cranges = 0;
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bfd_vma cranges_growth = 0;
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asection *osec;
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bfd_byte *crangesp;
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asection *cranges
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= bfd_get_section_by_name (output_bfd, SH64_CRANGES_SECTION_NAME);
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/* If this ever starts doing something, we will pick it up. */
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after_allocation_default ();
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/* If there is no .cranges section, it is because it was seen earlier on
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that none was needed. Otherwise it must have been created then, or
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be present in input. */
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if (cranges == NULL)
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return;
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/* First, we set the ISA flags for each output section according to the
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first non-discarded section. For each input section in osec, we
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check if it has the same flags. If it does not, we set flags to mark
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a mixed section (and exit the loop early). */
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for (osec = output_bfd->sections;
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osec != NULL;
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osec = osec->next)
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{
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bfd_vma oflags_isa = 0;
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bfd_boolean need_check_cranges = FALSE;
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/* Omit excluded or garbage-collected sections. */
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if (bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE)
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continue;
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/* First find an input section so we have flags to compare with; the
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flags in the output section are not valid. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0)
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{
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oflags_isa
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= (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
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goto break_1;
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}
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}
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}
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}
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break_1:
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/* Check that all input sections have the same contents-type flags
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as the first input section. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0)
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{
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bfd_vma iflags_isa
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= (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
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/* If flags don't agree, set the target-specific data
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of the section to mark that this section needs to
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be have .cranges section entries added. Don't
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bother setting ELF section flags in output section;
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they will be cleared later and will have to be
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re-initialized before the linked file is written. */
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if (iflags_isa != oflags_isa)
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{
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oflags_isa = SHF_SH5_ISA32_MIXED;
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BFD_ASSERT (sh64_elf_section_data (osec)->sh64_info);
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sh64_elf_section_data (osec)->sh64_info->contents_flags
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= SHF_SH5_ISA32_MIXED;
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need_check_cranges = TRUE;
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goto break_2;
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}
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}
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}
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}
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}
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break_2:
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/* If there were no new ranges for this output section, we don't
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need to iterate over the input sections to check how many are
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needed. */
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if (! need_check_cranges)
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continue;
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/* If we found a section with differing contents type, we need more
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ranges to mark the sections that are not mixed (and already have
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.cranges descriptors). Calculate the maximum number of new
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entries here. We may merge some of them, so that number is not
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final; it can shrink. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0
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&& ((elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
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!= SHF_SH5_ISA32_MIXED))
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new_cranges++;
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}
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}
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}
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}
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/* ldemul_after_allocation may be called twice. First directly from
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lang_process, and the second time when lang_process calls ldemul_finish,
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which calls gld${EMULATION_NAME}_finish, e.g. gldshelf32_finish, which
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is defined in emultempl/elf32.em and calls ldemul_after_allocation,
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if bfd_elf_discard_info returned true. */
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if (cranges->contents != NULL)
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free (cranges->contents);
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BFD_ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
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/* Make sure we have .cranges in memory even if there were only
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assembler-generated .cranges. */
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cranges_growth = new_cranges * SH64_CRANGE_SIZE;
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cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
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bfd_set_section_flags (cranges->owner, cranges,
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bfd_get_section_flags (cranges->owner, cranges)
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| SEC_IN_MEMORY);
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/* If we don't need to grow the .cranges section beyond what was in the
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input sections, we have nothing more to do here. We then only got
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here because there was a .cranges section coming from input. Zero
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out the number of generated .cranges. */
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if (new_cranges == 0)
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{
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sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
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return;
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}
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crangesp = cranges->contents + cranges->size;
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/* Now pass over the sections again, and make reloc orders for the new
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.cranges entries. Constants are set as we go. */
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for (osec = output_bfd->sections;
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osec != NULL;
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osec = osec->next)
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{
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struct bfd_link_order *cr_addr_order = NULL;
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enum sh64_elf_cr_type last_cr_type = CRT_NONE;
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bfd_vma last_cr_size = 0;
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bfd_vma continuation_vma = 0;
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/* Omit excluded or garbage-collected sections, and output sections
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which were not marked as needing further processing. */
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if ((bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE) != 0
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|| (sh64_elf_section_data (osec)->sh64_info->contents_flags
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!= SHF_SH5_ISA32_MIXED))
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continue;
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{
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LANG_FOR_EACH_INPUT_STATEMENT (f)
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{
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asection *isec;
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for (isec = f->the_bfd->sections;
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isec != NULL;
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isec = isec->next)
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{
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/* Allow only sections that have (at least initially) a
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non-zero size, and are not excluded, and are not marked
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as containing mixed data, thus already having .cranges
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entries. */
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if (isec->output_section == osec
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&& isec->size != 0
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&& (bfd_get_section_flags (isec->owner, isec)
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& SEC_EXCLUDE) == 0
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&& ((elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
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!= SHF_SH5_ISA32_MIXED))
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{
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enum sh64_elf_cr_type cr_type;
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bfd_vma cr_size;
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bfd_vma isa_flags
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= (elf_section_data (isec)->this_hdr.sh_flags
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& (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
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if (isa_flags == SHF_SH5_ISA32)
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cr_type = CRT_SH5_ISA32;
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else if ((bfd_get_section_flags (isec->owner, isec)
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& SEC_CODE) == 0)
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cr_type = CRT_DATA;
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else
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cr_type = CRT_SH5_ISA16;
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cr_size = isec->size;
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/* Sections can be empty, like .text in a file that
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only contains other sections. Ranges shouldn't be
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emitted for them. This can presumably happen after
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relaxing and is not be caught at the "raw size"
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test above. */
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if (cr_size == 0)
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continue;
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/* See if this is a continuation of the previous range
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for the same output section. If so, just change
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the size of the last range and continue. */
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if (cr_type == last_cr_type
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&& (continuation_vma
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== osec->vma + isec->output_offset))
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{
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last_cr_size += cr_size;
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bfd_put_32 (output_bfd, last_cr_size,
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crangesp - SH64_CRANGE_SIZE
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+ SH64_CRANGE_CR_SIZE_OFFSET);
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continuation_vma += cr_size;
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continue;
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}
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/* If we emit relocatable contents, we need a
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relocation for the start address. */
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if (link_info.relocatable || link_info.emitrelocations)
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{
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/* FIXME: We could perhaps use lang_add_reloc and
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friends here, but I'm not really sure that
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would leave us free to do some optimizations
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later. */
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cr_addr_order
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= bfd_new_link_order (output_bfd, cranges);
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if (cr_addr_order == NULL)
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{
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einfo (_("%P%F: bfd_new_link_order failed\n"));
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return;
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}
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|
|
cr_addr_order->type = bfd_section_reloc_link_order;
|
|
cr_addr_order->offset
|
|
= (cranges->output_offset
|
|
+ crangesp + SH64_CRANGE_CR_ADDR_OFFSET
|
|
- cranges->contents);
|
|
cr_addr_order->size = 4;
|
|
cr_addr_order->u.reloc.p
|
|
= xmalloc (sizeof (struct bfd_link_order_reloc));
|
|
|
|
cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
|
|
cr_addr_order->u.reloc.p->u.section = osec;
|
|
|
|
/* Since SH, unlike normal RELA-targets, uses a
|
|
"partial inplace" REL-like relocation for this,
|
|
we put the addend in the contents and specify 0
|
|
for the reloc. */
|
|
bfd_put_32 (output_bfd, isec->output_offset,
|
|
crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
|
|
cr_addr_order->u.reloc.p->addend = 0;
|
|
}
|
|
else
|
|
bfd_put_32 (output_bfd,
|
|
osec->vma + isec->output_offset,
|
|
crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
|
|
|
|
/* If we could make a reloc for cr_size we would do
|
|
it, but we would have to have a symbol for the size
|
|
of the _input_ section and there's no way to
|
|
generate that. */
|
|
bfd_put_32 (output_bfd, cr_size,
|
|
crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
|
|
|
|
bfd_put_16 (output_bfd, cr_type,
|
|
crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
|
|
|
|
last_cr_type = cr_type;
|
|
last_cr_size = cr_size;
|
|
continuation_vma
|
|
= osec->vma + isec->output_offset + cr_size;
|
|
crangesp += SH64_CRANGE_SIZE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The .cranges section will have this size, no larger or smaller.
|
|
Since relocs (if relocatable linking) will be emitted into the
|
|
"extended" size, we must set the raw size to the total. We have to
|
|
keep track of the number of new .cranges entries.
|
|
|
|
Sorting before writing is done by sh64_elf_final_write_processing. */
|
|
|
|
sh64_elf_section_data (cranges)->sh64_info->cranges_growth
|
|
= crangesp - cranges->contents - cranges->size;
|
|
cranges->size = crangesp - cranges->contents;
|
|
cranges->rawsize = cranges->size;
|
|
}
|