mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-10 03:54:48 +00:00
668 lines
20 KiB
Plaintext
668 lines
20 KiB
Plaintext
# 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, 2006, 2007, 2008, 2009
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# Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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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 3 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,
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# 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 "$TARGET2_TYPE" && TARGET2_TYPE="rel"
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fragment <<EOF
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#include "ldctor.h"
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#include "elf/arm.h"
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static char *thumb_entry_symbol = NULL;
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static int byteswap_code = 0;
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static int target1_is_rel = 0${TARGET1_IS_REL};
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static char *target2_type = "${TARGET2_TYPE}";
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static int fix_v4bx = 0;
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static int use_blx = 0;
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static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
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static int fix_cortex_a8 = -1;
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static int no_enum_size_warning = 0;
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static int no_wchar_size_warning = 0;
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static int pic_veneer = 0;
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static void
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gld${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_before_allocation (void)
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{
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bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
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/* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
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due to architecture version. */
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bfd_elf32_arm_set_vfp11_fix (link_info.output_bfd, &link_info);
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/* Auto-select Cortex-A8 erratum fix if it wasn't explicitly specified. */
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bfd_elf32_arm_set_cortex_a8_fix (link_info.output_bfd, &link_info);
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/* We should be able to set the size of the interworking stub section. We
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can't do it until later if we have dynamic sections, though. */
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if (! elf_hash_table (&link_info)->dynamic_sections_created)
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{
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/* Here we rummage through the found bfds to collect glue information. */
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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/* Initialise mapping tables for code/data. */
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bfd_elf32_arm_init_maps (is->the_bfd);
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if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
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&link_info)
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|| !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
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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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/* 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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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_before_allocation ();
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}
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/* Fake input file for stubs. */
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static lang_input_statement_type *stub_file;
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/* Whether we need to call gldarm_layout_sections_again. */
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static int need_laying_out = 0;
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/* Maximum size of a group of input sections that can be handled by
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one stub section. A value of +/-1 indicates the bfd back-end
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should use a suitable default size. */
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static bfd_signed_vma group_size = 1;
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struct hook_stub_info
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{
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lang_statement_list_type add;
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asection *input_section;
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};
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/* Traverse the linker tree to find the spot where the stub goes. */
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static bfd_boolean
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hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
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{
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lang_statement_union_type *l;
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bfd_boolean ret;
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for (; (l = *lp) != NULL; lp = &l->header.next)
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{
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switch (l->header.type)
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{
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case lang_constructors_statement_enum:
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ret = hook_in_stub (info, &constructor_list.head);
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if (ret)
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return ret;
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break;
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case lang_output_section_statement_enum:
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ret = hook_in_stub (info,
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&l->output_section_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_wild_statement_enum:
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ret = hook_in_stub (info, &l->wild_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_group_statement_enum:
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ret = hook_in_stub (info, &l->group_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_input_section_enum:
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if (l->input_section.section == info->input_section)
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{
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/* We've found our section. Insert the stub immediately
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after its associated input section. */
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*(info->add.tail) = l->header.next;
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l->header.next = info->add.head;
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return TRUE;
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}
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break;
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case lang_data_statement_enum:
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case lang_reloc_statement_enum:
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case lang_object_symbols_statement_enum:
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case lang_output_statement_enum:
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case lang_target_statement_enum:
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case lang_input_statement_enum:
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case lang_assignment_statement_enum:
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case lang_padding_statement_enum:
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case lang_address_statement_enum:
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case lang_fill_statement_enum:
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break;
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default:
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FAIL ();
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break;
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}
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}
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return FALSE;
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}
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/* Call-back for elf32_arm_size_stubs. */
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/* Create a new stub section, and arrange for it to be linked
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immediately after INPUT_SECTION. */
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static asection *
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elf32_arm_add_stub_section (const char *stub_sec_name,
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asection *input_section)
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{
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asection *stub_sec;
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flagword flags;
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asection *output_section;
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const char *secname;
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lang_output_section_statement_type *os;
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struct hook_stub_info info;
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flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
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| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
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stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
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stub_sec_name, flags);
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if (stub_sec == NULL)
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goto err_ret;
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bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
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output_section = input_section->output_section;
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secname = bfd_get_section_name (output_section->owner, output_section);
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os = lang_output_section_find (secname);
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info.input_section = input_section;
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lang_list_init (&info.add);
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lang_add_section (&info.add, stub_sec, os);
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if (info.add.head == NULL)
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goto err_ret;
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if (hook_in_stub (&info, &os->children.head))
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return stub_sec;
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err_ret:
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einfo ("%X%P: can not make stub section: %E\n");
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return NULL;
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}
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/* Another call-back for elf_arm_size_stubs. */
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static void
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gldarm_layout_sections_again (void)
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{
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/* If we have changed sizes of the stub sections, then we need
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to recalculate all the section offsets. This may mean we need to
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add even more stubs. */
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gld${EMULATION_NAME}_map_segments (TRUE);
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need_laying_out = -1;
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}
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static void
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build_section_lists (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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&& i->output_section != NULL
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&& i->output_section->owner == link_info.output_bfd)
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elf32_arm_next_input_section (& link_info, i);
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}
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}
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static int
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compare_output_sec_vma (const void *a, const void *b)
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{
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asection *asec = *(asection **) a, *bsec = *(asection **) b;
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asection *aout = asec->output_section, *bout = bsec->output_section;
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bfd_vma avma, bvma;
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/* If there's no output section for some reason, compare equal. */
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if (!aout || !bout)
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return 0;
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avma = aout->vma + asec->output_offset;
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bvma = bout->vma + bsec->output_offset;
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if (avma > bvma)
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return 1;
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else if (avma < bvma)
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return -1;
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return 0;
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}
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static void
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gld${EMULATION_NAME}_after_allocation (void)
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{
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if (!link_info.relocatable)
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{
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/* Build a sorted list of input text sections, then use that to process
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the unwind table index. */
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unsigned int list_size = 10;
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asection **sec_list = xmalloc (list_size * sizeof (asection *));
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unsigned int sec_count = 0;
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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bfd *abfd = is->the_bfd;
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asection *sec;
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if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
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continue;
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for (sec = abfd->sections; sec != NULL; sec = sec->next)
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{
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asection *out_sec = sec->output_section;
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if (out_sec
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&& elf_section_data (sec)
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&& elf_section_type (sec) == SHT_PROGBITS
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&& (elf_section_flags (sec) & SHF_EXECINSTR) != 0
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&& (sec->flags & SEC_EXCLUDE) == 0
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&& sec->sec_info_type != ELF_INFO_TYPE_JUST_SYMS
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&& out_sec != bfd_abs_section_ptr)
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{
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if (sec_count == list_size)
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{
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list_size *= 2;
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sec_list = xrealloc (sec_list,
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list_size * sizeof (asection *));
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}
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sec_list[sec_count++] = sec;
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}
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}
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}
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qsort (sec_list, sec_count, sizeof (asection *), &compare_output_sec_vma);
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if (elf32_arm_fix_exidx_coverage (sec_list, sec_count, &link_info))
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need_laying_out = 1;
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free (sec_list);
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}
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/* bfd_elf32_discard_info just plays with debugging sections,
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ie. doesn't affect any code, so we can delay resizing the
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sections. It's likely we'll resize everything in the process of
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adding stubs. */
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if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
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need_laying_out = 1;
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/* If generating a relocatable output file, then we don't
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have to examine the relocs. */
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if (stub_file != NULL && !link_info.relocatable)
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{
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int ret = elf32_arm_setup_section_lists (link_info.output_bfd, & link_info);
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if (ret != 0)
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{
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if (ret < 0)
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{
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einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
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return;
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}
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lang_for_each_statement (build_section_lists);
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/* Call into the BFD backend to do the real work. */
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if (! elf32_arm_size_stubs (link_info.output_bfd,
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stub_file->the_bfd,
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& link_info,
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group_size,
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& elf32_arm_add_stub_section,
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& gldarm_layout_sections_again))
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{
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einfo ("%X%P: cannot size stub section: %E\n");
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return;
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}
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}
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}
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if (need_laying_out != -1)
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gld${EMULATION_NAME}_map_segments (need_laying_out);
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}
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static void
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gld${EMULATION_NAME}_finish (void)
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{
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struct bfd_link_hash_entry * h;
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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/* Figure out where VFP11 erratum veneers (and the labels returning
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from same) have been placed. */
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bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
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}
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}
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if (! link_info.relocatable)
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{
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/* Now build the linker stubs. */
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if (stub_file->the_bfd->sections != NULL)
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{
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if (! elf32_arm_build_stubs (& link_info))
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einfo ("%X%P: can not build stubs: %E\n");
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}
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}
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finish_default ();
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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 (link_info.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: cannot find thumb start symbol %s\n"),
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thumb_entry_symbol);
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}
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/* This is a convenient 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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if (strstr (bfd_get_target (link_info.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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bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info,
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target1_is_rel,
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target2_type, fix_v4bx, use_blx,
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vfp11_denorm_fix, no_enum_size_warning,
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no_wchar_size_warning,
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pic_veneer, fix_cortex_a8);
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stub_file = lang_add_input_file ("linker stubs",
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lang_input_file_is_fake_enum,
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NULL);
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stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
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if (stub_file->the_bfd == NULL
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|| ! bfd_set_arch_mach (stub_file->the_bfd,
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bfd_get_arch (link_info.output_bfd),
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bfd_get_mach (link_info.output_bfd)))
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{
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einfo ("%X%P: can not create BFD %E\n");
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return;
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}
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stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
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ldlang_add_file (stub_file);
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/* Also use the stub file for stubs placed in a single output section. */
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bfd_elf32_arm_add_glue_sections_to_bfd (stub_file->the_bfd, &link_info);
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bfd_elf32_arm_get_bfd_for_interworking (stub_file->the_bfd, &link_info);
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}
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/* Avoid processing the fake stub_file in vercheck, stat_needed and
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|
check_needed routines. */
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static void (*real_func) (lang_input_statement_type *);
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static void arm_for_each_input_file_wrapper (lang_input_statement_type *l)
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{
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if (l != stub_file)
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(*real_func) (l);
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}
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static void
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arm_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
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|
{
|
|
real_func = func;
|
|
lang_for_each_input_file (&arm_for_each_input_file_wrapper);
|
|
}
|
|
|
|
#define lang_for_each_input_file arm_lang_for_each_input_file
|
|
|
|
EOF
|
|
|
|
# Define some shell vars to insert bits of code into the standard elf
|
|
# parse_args and list_options functions.
|
|
#
|
|
PARSE_AND_LIST_PROLOGUE='
|
|
#define OPTION_THUMB_ENTRY 301
|
|
#define OPTION_BE8 302
|
|
#define OPTION_TARGET1_REL 303
|
|
#define OPTION_TARGET1_ABS 304
|
|
#define OPTION_TARGET2 305
|
|
#define OPTION_FIX_V4BX 306
|
|
#define OPTION_USE_BLX 307
|
|
#define OPTION_VFP11_DENORM_FIX 308
|
|
#define OPTION_NO_ENUM_SIZE_WARNING 309
|
|
#define OPTION_PIC_VENEER 310
|
|
#define OPTION_FIX_V4BX_INTERWORKING 311
|
|
#define OPTION_STUBGROUP_SIZE 312
|
|
#define OPTION_NO_WCHAR_SIZE_WARNING 313
|
|
#define OPTION_FIX_CORTEX_A8 314
|
|
#define OPTION_NO_FIX_CORTEX_A8 315
|
|
'
|
|
|
|
PARSE_AND_LIST_SHORTOPTS=p
|
|
|
|
PARSE_AND_LIST_LONGOPTS='
|
|
{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
|
|
{ "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
|
|
{ "be8", no_argument, NULL, OPTION_BE8},
|
|
{ "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
|
|
{ "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
|
|
{ "target2", required_argument, NULL, OPTION_TARGET2},
|
|
{ "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
|
|
{ "fix-v4bx-interworking", no_argument, NULL, OPTION_FIX_V4BX_INTERWORKING},
|
|
{ "use-blx", no_argument, NULL, OPTION_USE_BLX},
|
|
{ "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
|
|
{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
|
|
{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
|
|
{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
|
|
{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
|
|
{ "fix-cortex-a8", no_argument, NULL, OPTION_FIX_CORTEX_A8 },
|
|
{ "no-fix-cortex-a8", no_argument, NULL, OPTION_NO_FIX_CORTEX_A8 },
|
|
'
|
|
|
|
PARSE_AND_LIST_OPTIONS='
|
|
fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
|
|
fprintf (file, _(" --be8 Output BE8 format image\n"));
|
|
fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
|
|
fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
|
|
fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
|
|
fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
|
|
fprintf (file, _(" --fix-v4bx-interworking Rewrite BX rn branch to ARMv4 interworking veneer\n"));
|
|
fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
|
|
fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
|
|
fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
|
|
" enum sizes\n"));
|
|
fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
|
|
" wchar_t sizes\n"));
|
|
fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
|
|
fprintf (file, _("\
|
|
--stub-group-size=N Maximum size of a group of input sections that can be\n\
|
|
handled by one stub section. A negative value\n\
|
|
locates all stubs after their branches (with a\n\
|
|
group size of -N), while a positive value allows\n\
|
|
two groups of input sections, one before, and one\n\
|
|
after each stub section. Values of +/-1 indicate\n\
|
|
the linker should choose suitable defaults.\n"
|
|
));
|
|
fprintf (file, _(" --[no-]fix-cortex-a8 Disable/enable Cortex-A8 Thumb-2 branch erratum fix\n"));
|
|
'
|
|
|
|
PARSE_AND_LIST_ARGS_CASES='
|
|
case '\'p\'':
|
|
/* Only here for backwards compatibility. */
|
|
break;
|
|
|
|
case OPTION_THUMB_ENTRY:
|
|
thumb_entry_symbol = optarg;
|
|
break;
|
|
|
|
case OPTION_BE8:
|
|
byteswap_code = 1;
|
|
break;
|
|
|
|
case OPTION_TARGET1_REL:
|
|
target1_is_rel = 1;
|
|
break;
|
|
|
|
case OPTION_TARGET1_ABS:
|
|
target1_is_rel = 0;
|
|
break;
|
|
|
|
case OPTION_TARGET2:
|
|
target2_type = optarg;
|
|
break;
|
|
|
|
case OPTION_FIX_V4BX:
|
|
fix_v4bx = 1;
|
|
break;
|
|
|
|
case OPTION_FIX_V4BX_INTERWORKING:
|
|
fix_v4bx = 2;
|
|
break;
|
|
|
|
case OPTION_USE_BLX:
|
|
use_blx = 1;
|
|
break;
|
|
|
|
case OPTION_VFP11_DENORM_FIX:
|
|
if (strcmp (optarg, "none") == 0)
|
|
vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
|
|
else if (strcmp (optarg, "scalar") == 0)
|
|
vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
|
|
else if (strcmp (optarg, "vector") == 0)
|
|
vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
|
|
else
|
|
einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
|
|
break;
|
|
|
|
case OPTION_NO_ENUM_SIZE_WARNING:
|
|
no_enum_size_warning = 1;
|
|
break;
|
|
|
|
case OPTION_NO_WCHAR_SIZE_WARNING:
|
|
no_wchar_size_warning = 1;
|
|
break;
|
|
|
|
case OPTION_PIC_VENEER:
|
|
pic_veneer = 1;
|
|
break;
|
|
|
|
case OPTION_STUBGROUP_SIZE:
|
|
{
|
|
const char *end;
|
|
|
|
group_size = bfd_scan_vma (optarg, &end, 0);
|
|
if (*end)
|
|
einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
|
|
}
|
|
break;
|
|
|
|
case OPTION_FIX_CORTEX_A8:
|
|
fix_cortex_a8 = 1;
|
|
break;
|
|
|
|
case OPTION_NO_FIX_CORTEX_A8:
|
|
fix_cortex_a8 = 0;
|
|
break;
|
|
'
|
|
|
|
# We have our own before_allocation etc. functions, but they call
|
|
# the standard routines, so give them a different name.
|
|
LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
|
|
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
|
|
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
|
|
|
|
# Replace the elf before_parse function with our own.
|
|
LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
|
|
|
|
# Call the extra arm-elf function
|
|
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
|