1d022697d9
ld/ * emultempl/armelf.em: Include elf/arm.h. (arm_elf_finish): Set low address bit if enty point is a Thumb function. ld/testsuite/ * ld-arm/arm-elf.exp: Add thumb-entry test. * ld-arm/thumb-entry.d: New test. * ld-arm/thumb-entry.s: New test.
301 lines
9.2 KiB
Text
301 lines
9.2 KiB
Text
# This shell script emits a C file. -*- C -*-
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# Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
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# 2004, 2005
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# 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 arm-elf
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# specific routines.
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#
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test -z "$TARGET2_TYPE" && TARGET2_TYPE="rel"
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "elf/arm.h"
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static char *thumb_entry_symbol = NULL;
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static bfd *bfd_for_interwork;
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static int byteswap_code = 0;
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static int target1_is_rel = 0${TARGET1_IS_REL};
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static char *target2_type = "${TARGET2_TYPE}";
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static int fix_v4bx = 0;
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static int use_blx = 0;
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static void
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gld${EMULATION_NAME}_before_parse (void)
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{
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#ifndef TARGET_ /* I.e., if not generic. */
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ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
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#endif /* not TARGET_ */
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config.dynamic_link = ${DYNAMIC_LINK-TRUE};
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config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
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}
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static void
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arm_elf_after_open (void)
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{
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if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
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{
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/* The arm backend needs special fields in the output hash structure.
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These will only be created if the output format is an arm format,
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hence we do not support linking and changing output formats at the
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same time. Use a link followed by objcopy to change output formats. */
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einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
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return;
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}
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
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}
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}
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_after_open ();
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}
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static void
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arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
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{
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if (statement->header.type == lang_input_section_enum)
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{
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asection *i = statement->input_section.section;
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if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
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&& (i->flags & SEC_EXCLUDE) == 0)
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{
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asection *output_section = i->output_section;
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ASSERT (output_section->owner == output_bfd);
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/* Don't attach the interworking stubs to a dynamic object, to
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an empty section, etc. */
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if ((output_section->flags & SEC_HAS_CONTENTS) != 0
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&& (i->flags & SEC_NEVER_LOAD) == 0
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&& ! (i->owner->flags & DYNAMIC)
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&& ! i->owner->output_has_begun)
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{
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bfd_for_interwork = i->owner;
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bfd_for_interwork->output_has_begun = TRUE;
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}
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}
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}
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}
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static void
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arm_elf_before_allocation (void)
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{
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bfd *tem;
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_before_allocation ();
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if (link_info.input_bfds != NULL)
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{
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/* The interworking bfd must be the last one in the link. */
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bfd_for_interwork = NULL;
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for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
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tem->output_has_begun = FALSE;
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lang_for_each_statement (arm_elf_set_bfd_for_interworking);
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for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
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tem->output_has_begun = FALSE;
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/* If bfd_for_interwork is NULL, then there are no loadable sections
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with real contents to be linked, so we are not going to have to
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create any interworking stubs, so it is OK not to call
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bfd_elf32_arm_get_bfd_for_interworking. */
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if (bfd_for_interwork != NULL)
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bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
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}
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/* We should be able to set the size of the interworking stub section. */
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/* Here we rummage through the found bfds to collect glue information. */
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/* FIXME: should this be based on a command line option? krk@cygnus.com */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
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byteswap_code))
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{
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/* xgettext:c-format */
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einfo (_("Errors encountered processing file %s"), is->filename);
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}
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}
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}
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/* We have seen it all. Allocate it, and carry on. */
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bfd_elf32_arm_allocate_interworking_sections (& link_info);
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}
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static void
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arm_elf_finish (void)
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{
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struct bfd_link_hash_entry * h;
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/* Call the elf32.em routine. */
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gld${EMULATION_NAME}_finish ();
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if (thumb_entry_symbol)
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{
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h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
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FALSE, FALSE, TRUE);
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}
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else
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{
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struct elf_link_hash_entry * eh;
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if (!entry_symbol.name)
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return;
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h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
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FALSE, FALSE, TRUE);
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eh = (struct elf_link_hash_entry *)h;
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if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
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return;
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}
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if (h != (struct bfd_link_hash_entry *) NULL
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&& (h->type == bfd_link_hash_defined
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|| h->type == bfd_link_hash_defweak)
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&& h->u.def.section->output_section != NULL)
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{
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static char buffer[32];
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bfd_vma val;
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/* Special procesing is required for a Thumb entry symbol. The
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bottom bit of its address must be set. */
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val = (h->u.def.value
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+ bfd_get_section_vma (output_bfd,
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h->u.def.section->output_section)
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+ h->u.def.section->output_offset);
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val |= 1;
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/* Now convert this value into a string and store it in entry_symbol
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where the lang_finish() function will pick it up. */
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buffer[0] = '0';
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buffer[1] = 'x';
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sprintf_vma (buffer + 2, val);
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if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
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&& entry_from_cmdline)
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einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
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thumb_entry_symbol, entry_symbol.name);
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entry_symbol.name = buffer;
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}
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else
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einfo (_("%P: warning: connot find thumb start symbol %s\n"),
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thumb_entry_symbol);
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}
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/* This is a convenitent point to tell BFD about target specific flags.
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After the output has been created, but before inputs are read. */
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static void
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arm_elf_create_output_section_statements (void)
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{
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bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type,
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fix_v4bx, use_blx);
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}
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EOF
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# Define some shell vars to insert bits of code into the standard elf
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# parse_args and list_options functions.
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#
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PARSE_AND_LIST_PROLOGUE='
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#define OPTION_THUMB_ENTRY 301
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#define OPTION_BE8 302
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#define OPTION_TARGET1_REL 303
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#define OPTION_TARGET1_ABS 304
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#define OPTION_TARGET2 305
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#define OPTION_FIX_V4BX 306
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#define OPTION_USE_BLX 307
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'
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PARSE_AND_LIST_SHORTOPTS=p
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PARSE_AND_LIST_LONGOPTS='
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{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
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{ "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
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{ "be8", no_argument, NULL, OPTION_BE8},
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{ "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
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{ "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
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{ "target2", required_argument, NULL, OPTION_TARGET2},
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{ "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
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{ "use-blx", no_argument, NULL, OPTION_USE_BLX},
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'
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PARSE_AND_LIST_OPTIONS='
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fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
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fprintf (file, _(" --be8 Oputput BE8 format image\n"));
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fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
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fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
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fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
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fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
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fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
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'
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PARSE_AND_LIST_ARGS_CASES='
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case '\'p\'':
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/* Only here for backwards compatibility. */
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break;
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case OPTION_THUMB_ENTRY:
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thumb_entry_symbol = optarg;
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break;
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case OPTION_BE8:
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byteswap_code = 1;
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break;
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case OPTION_TARGET1_REL:
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target1_is_rel = 1;
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break;
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case OPTION_TARGET1_ABS:
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target1_is_rel = 0;
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break;
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case OPTION_TARGET2:
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target2_type = optarg;
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break;
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case OPTION_FIX_V4BX:
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fix_v4bx = 1;
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break;
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case OPTION_USE_BLX:
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use_blx = 1;
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break;
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'
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# We have our own after_open and before_allocation functions, but they call
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# the standard routines, so give them a different name.
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LDEMUL_AFTER_OPEN=arm_elf_after_open
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LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
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LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
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# Replace the elf before_parse function with our own.
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LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
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# Call the extra arm-elf function
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LDEMUL_FINISH=arm_elf_finish
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