diff options
Diffstat (limited to 'binutils-2.21/ld/emultempl/hppaelf.em')
-rw-r--r-- | binutils-2.21/ld/emultempl/hppaelf.em | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/binutils-2.21/ld/emultempl/hppaelf.em b/binutils-2.21/ld/emultempl/hppaelf.em new file mode 100644 index 0000000..1137ba2 --- /dev/null +++ b/binutils-2.21/ld/emultempl/hppaelf.em @@ -0,0 +1,380 @@ +# This shell script emits a C file. -*- C -*- +# Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004, +# 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. +# +# This file is part of the GNU Binutils. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +# MA 02110-1301, USA. +# + +# This file is sourced from elf32.em, and defines extra hppa-elf +# specific routines. +# +fragment <<EOF + +#include "ldctor.h" +#include "elf32-hppa.h" + + +/* Fake input file for stubs. */ +static lang_input_statement_type *stub_file; + +/* Type of import/export stubs to build. For a single sub-space model, + we can build smaller import stubs and there is no need for export + stubs. */ +static int multi_subspace = 0; + +/* Whether we need to call hppa_layout_sections_again. */ +static int need_laying_out = 0; + +/* Maximum size of a group of input sections that can be handled by + one stub section. A value of +/-1 indicates the bfd back-end + should use a suitable default size. */ +static bfd_signed_vma group_size = 1; + +/* Stops the linker merging .text sections on a relocatable link, + and adds millicode library to the list of input files. */ + +static void +hppaelf_after_parse (void) +{ + if (link_info.relocatable) + lang_add_unique (".text"); + + /* Enable this once we split millicode stuff from libgcc: + lang_add_input_file ("milli", + lang_input_file_is_l_enum, + NULL); + */ + + after_parse_default (); +} + +/* This is called before the input files are opened. We create a new + fake input file to hold the stub sections. */ + +static void +hppaelf_create_output_section_statements (void) +{ + if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour + && (elf_object_id (link_info.output_bfd) == HPPA32_ELF_DATA + || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA))) + return; + + stub_file = lang_add_input_file ("linker stubs", + lang_input_file_is_fake_enum, + NULL); + stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); + if (stub_file->the_bfd == NULL + || ! bfd_set_arch_mach (stub_file->the_bfd, + bfd_get_arch (link_info.output_bfd), + bfd_get_mach (link_info.output_bfd))) + { + einfo ("%X%P: can not create BFD %E\n"); + return; + } + + stub_file->the_bfd->flags |= BFD_LINKER_CREATED; + ldlang_add_file (stub_file); +} + + +struct hook_stub_info +{ + lang_statement_list_type add; + asection *input_section; +}; + +/* Traverse the linker tree to find the spot where the stub goes. */ + +static bfd_boolean +hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) +{ + lang_statement_union_type *l; + bfd_boolean ret; + + for (; (l = *lp) != NULL; lp = &l->header.next) + { + switch (l->header.type) + { + case lang_constructors_statement_enum: + ret = hook_in_stub (info, &constructor_list.head); + if (ret) + return ret; + break; + + case lang_output_section_statement_enum: + ret = hook_in_stub (info, + &l->output_section_statement.children.head); + if (ret) + return ret; + break; + + case lang_wild_statement_enum: + ret = hook_in_stub (info, &l->wild_statement.children.head); + if (ret) + return ret; + break; + + case lang_group_statement_enum: + ret = hook_in_stub (info, &l->group_statement.children.head); + if (ret) + return ret; + break; + + case lang_input_section_enum: + if (l->input_section.section == info->input_section) + { + /* We've found our section. Insert the stub immediately + before its associated input section. */ + *lp = info->add.head; + *(info->add.tail) = l; + return TRUE; + } + break; + + case lang_data_statement_enum: + case lang_reloc_statement_enum: + case lang_object_symbols_statement_enum: + case lang_output_statement_enum: + case lang_target_statement_enum: + case lang_input_statement_enum: + case lang_assignment_statement_enum: + case lang_padding_statement_enum: + case lang_address_statement_enum: + case lang_fill_statement_enum: + break; + + default: + FAIL (); + break; + } + } + return FALSE; +} + + +/* Call-back for elf32_hppa_size_stubs. */ + +/* Create a new stub section, and arrange for it to be linked + immediately before INPUT_SECTION. */ + +static asection * +hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section) +{ + asection *stub_sec; + flagword flags; + asection *output_section; + const char *secname; + lang_output_section_statement_type *os; + struct hook_stub_info info; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE + | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); + stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, + stub_sec_name, flags); + if (stub_sec == NULL) + goto err_ret; + + output_section = input_section->output_section; + secname = bfd_get_section_name (output_section->owner, output_section); + os = lang_output_section_find (secname); + + info.input_section = input_section; + lang_list_init (&info.add); + lang_add_section (&info.add, stub_sec, os); + + if (info.add.head == NULL) + goto err_ret; + + if (hook_in_stub (&info, &os->children.head)) + return stub_sec; + + err_ret: + einfo ("%X%P: can not make stub section: %E\n"); + return NULL; +} + + +/* Another call-back for elf32_hppa_size_stubs. */ + +static void +hppaelf_layout_sections_again (void) +{ + /* If we have changed sizes of the stub sections, then we need + to recalculate all the section offsets. This may mean we need to + add even more stubs. */ + gld${EMULATION_NAME}_map_segments (TRUE); + need_laying_out = -1; +} + + +static void +build_section_lists (lang_statement_union_type *statement) +{ + if (statement->header.type == lang_input_section_enum) + { + asection *i = statement->input_section.section; + + if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag + && (i->flags & SEC_EXCLUDE) == 0 + && i->output_section != NULL + && i->output_section->owner == link_info.output_bfd) + { + elf32_hppa_next_input_section (&link_info, i); + } + } +} + + +/* For the PA we use this opportunity to size and build linker stubs. */ + +static void +gld${EMULATION_NAME}_after_allocation (void) +{ + /* bfd_elf_discard_info just plays with data and debugging sections, + ie. doesn't affect code size, so we can delay resizing the + sections. It's likely we'll resize everything in the process of + adding stubs. */ + if (bfd_elf_discard_info (link_info.output_bfd, &link_info)) + need_laying_out = 1; + + /* If generating a relocatable output file, then we don't + have to examine the relocs. */ + if (stub_file != NULL && !link_info.relocatable) + { + int ret = elf32_hppa_setup_section_lists (link_info.output_bfd, + &link_info); + + if (ret != 0) + { + if (ret < 0) + { + einfo ("%X%P: can not size stub section: %E\n"); + return; + } + + lang_for_each_statement (build_section_lists); + + /* Call into the BFD backend to do the real work. */ + if (! elf32_hppa_size_stubs (link_info.output_bfd, + stub_file->the_bfd, + &link_info, + multi_subspace, + group_size, + &hppaelf_add_stub_section, + &hppaelf_layout_sections_again)) + { + einfo ("%X%P: can not size stub section: %E\n"); + return; + } + } + } + + if (need_laying_out != -1) + gld${EMULATION_NAME}_map_segments (need_laying_out); + + if (! link_info.relocatable) + { + /* Set the global data pointer. */ + if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info)) + { + einfo ("%X%P: can not set gp\n"); + return; + } + + /* Now build the linker stubs. */ + if (stub_file != NULL && stub_file->the_bfd->sections != NULL) + { + if (! elf32_hppa_build_stubs (&link_info)) + einfo ("%X%P: can not build stubs: %E\n"); + } + } +} + + +/* Avoid processing the fake stub_file in vercheck, stat_needed and + check_needed routines. */ + +static void (*real_func) (lang_input_statement_type *); + +static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l) +{ + if (l != stub_file) + (*real_func) (l); +} + +static void +hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) +{ + real_func = func; + lang_for_each_input_file (&hppa_for_each_input_file_wrapper); +} + +#define lang_for_each_input_file hppa_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_MULTI_SUBSPACE 301 +#define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1) +' + +PARSE_AND_LIST_LONGOPTS=' + { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE }, + { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, +' + +PARSE_AND_LIST_OPTIONS=' + fprintf (file, _("\ + --multi-subspace Generate import and export stubs to support\n\ + multiple sub-space shared libraries\n" + )); + fprintf (file, _("\ + --stub-group-size=N Maximum size of a group of input sections that\n\ + can be handled by one stub section. A negative\n\ + value locates all stubs before their branches\n\ + (with a group size of -N), while a positive\n\ + value allows two groups of input sections, one\n\ + before, and one after each stub section.\n\ + Values of +/-1 indicate the linker should\n\ + choose suitable defaults.\n" + )); +' + +PARSE_AND_LIST_ARGS_CASES=' + case OPTION_MULTI_SUBSPACE: + multi_subspace = 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; +' + +# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation +# +LDEMUL_AFTER_PARSE=hppaelf_after_parse +LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation +LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements |