1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 1991-2014 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 3 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 # This file is sourced from elf32.em, and defines extra hppa-elf
28 #include "elf32-hppa.h"
31 /* Fake input file for stubs. */
32 static lang_input_statement_type *stub_file;
34 /* Type of import/export stubs to build. For a single sub-space model,
35 we can build smaller import stubs and there is no need for export
37 static int multi_subspace = 0;
39 /* Whether we need to call hppa_layout_sections_again. */
40 static int need_laying_out = 0;
42 /* Maximum size of a group of input sections that can be handled by
43 one stub section. A value of +/-1 indicates the bfd back-end
44 should use a suitable default size. */
45 static bfd_signed_vma group_size = 1;
47 /* Stops the linker merging .text sections on a relocatable link,
48 and adds millicode library to the list of input files. */
51 hppaelf_after_parse (void)
53 if (link_info.relocatable)
54 lang_add_unique (".text");
56 /* Enable this once we split millicode stuff from libgcc:
57 lang_add_input_file ("milli",
58 lang_input_file_is_l_enum,
62 after_parse_default ();
65 /* This is called before the input files are opened. We create a new
66 fake input file to hold the stub sections. */
69 hppaelf_create_output_section_statements (void)
71 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
72 && (elf_object_id (link_info.output_bfd) == HPPA32_ELF_DATA
73 || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA)))
76 stub_file = lang_add_input_file ("linker stubs",
77 lang_input_file_is_fake_enum,
79 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
80 if (stub_file->the_bfd == NULL
81 || ! bfd_set_arch_mach (stub_file->the_bfd,
82 bfd_get_arch (link_info.output_bfd),
83 bfd_get_mach (link_info.output_bfd)))
85 einfo ("%X%P: can not create BFD %E\n");
89 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
90 ldlang_add_file (stub_file);
96 lang_statement_list_type add;
97 asection *input_section;
100 /* Traverse the linker tree to find the spot where the stub goes. */
103 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
105 lang_statement_union_type *l;
108 for (; (l = *lp) != NULL; lp = &l->header.next)
110 switch (l->header.type)
112 case lang_constructors_statement_enum:
113 ret = hook_in_stub (info, &constructor_list.head);
118 case lang_output_section_statement_enum:
119 ret = hook_in_stub (info,
120 &l->output_section_statement.children.head);
125 case lang_wild_statement_enum:
126 ret = hook_in_stub (info, &l->wild_statement.children.head);
131 case lang_group_statement_enum:
132 ret = hook_in_stub (info, &l->group_statement.children.head);
137 case lang_input_section_enum:
138 if (l->input_section.section == info->input_section)
140 /* We've found our section. Insert the stub immediately
141 before its associated input section. */
142 *lp = info->add.head;
143 *(info->add.tail) = l;
148 case lang_data_statement_enum:
149 case lang_reloc_statement_enum:
150 case lang_object_symbols_statement_enum:
151 case lang_output_statement_enum:
152 case lang_target_statement_enum:
153 case lang_input_statement_enum:
154 case lang_assignment_statement_enum:
155 case lang_padding_statement_enum:
156 case lang_address_statement_enum:
157 case lang_fill_statement_enum:
169 /* Call-back for elf32_hppa_size_stubs. */
171 /* Create a new stub section, and arrange for it to be linked
172 immediately before INPUT_SECTION. */
175 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
179 asection *output_section;
180 lang_output_section_statement_type *os;
181 struct hook_stub_info info;
183 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
184 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
185 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
186 stub_sec_name, flags);
187 if (stub_sec == NULL)
190 output_section = input_section->output_section;
191 os = lang_output_section_get (output_section);
193 info.input_section = input_section;
194 lang_list_init (&info.add);
195 lang_add_section (&info.add, stub_sec, NULL, os);
197 if (info.add.head == NULL)
200 if (hook_in_stub (&info, &os->children.head))
204 einfo ("%X%P: can not make stub section: %E\n");
209 /* Another call-back for elf32_hppa_size_stubs. */
212 hppaelf_layout_sections_again (void)
214 /* If we have changed sizes of the stub sections, then we need
215 to recalculate all the section offsets. This may mean we need to
216 add even more stubs. */
217 gld${EMULATION_NAME}_map_segments (TRUE);
218 need_laying_out = -1;
223 build_section_lists (lang_statement_union_type *statement)
225 if (statement->header.type == lang_input_section_enum)
227 asection *i = statement->input_section.section;
229 if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
230 && (i->flags & SEC_EXCLUDE) == 0
231 && i->output_section != NULL
232 && i->output_section->owner == link_info.output_bfd)
234 elf32_hppa_next_input_section (&link_info, i);
240 /* For the PA we use this opportunity to size and build linker stubs. */
243 gld${EMULATION_NAME}_after_allocation (void)
247 /* bfd_elf_discard_info just plays with data and debugging sections,
248 ie. doesn't affect code size, so we can delay resizing the
249 sections. It's likely we'll resize everything in the process of
251 ret = bfd_elf_discard_info (link_info.output_bfd, &link_info);
254 einfo ("%X%P: .eh_frame/.stab edit: %E\n");
260 /* If generating a relocatable output file, then we don't
261 have to examine the relocs. */
262 if (stub_file != NULL && !link_info.relocatable)
264 ret = elf32_hppa_setup_section_lists (link_info.output_bfd, &link_info);
269 einfo ("%X%P: can not size stub section: %E\n");
273 lang_for_each_statement (build_section_lists);
275 /* Call into the BFD backend to do the real work. */
276 if (! elf32_hppa_size_stubs (link_info.output_bfd,
281 &hppaelf_add_stub_section,
282 &hppaelf_layout_sections_again))
284 einfo ("%X%P: can not size stub section: %E\n");
290 if (need_laying_out != -1)
291 gld${EMULATION_NAME}_map_segments (need_laying_out);
293 if (! link_info.relocatable)
295 /* Set the global data pointer. */
296 if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
298 einfo ("%X%P: can not set gp\n");
302 /* Now build the linker stubs. */
303 if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
305 if (! elf32_hppa_build_stubs (&link_info))
306 einfo ("%X%P: can not build stubs: %E\n");
312 /* Avoid processing the fake stub_file in vercheck, stat_needed and
313 check_needed routines. */
315 static void (*real_func) (lang_input_statement_type *);
317 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
324 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
327 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
330 #define lang_for_each_input_file hppa_lang_for_each_input_file
334 # Define some shell vars to insert bits of code into the standard elf
335 # parse_args and list_options functions.
337 PARSE_AND_LIST_PROLOGUE='
338 #define OPTION_MULTI_SUBSPACE 301
339 #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
342 PARSE_AND_LIST_LONGOPTS='
343 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
344 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
347 PARSE_AND_LIST_OPTIONS='
349 --multi-subspace Generate import and export stubs to support\n\
350 multiple sub-space shared libraries\n"
353 --stub-group-size=N Maximum size of a group of input sections that\n\
354 can be handled by one stub section. A negative\n\
355 value locates all stubs before their branches\n\
356 (with a group size of -N), while a positive\n\
357 value allows two groups of input sections, one\n\
358 before, and one after each stub section.\n\
359 Values of +/-1 indicate the linker should\n\
360 choose suitable defaults.\n"
364 PARSE_AND_LIST_ARGS_CASES='
365 case OPTION_MULTI_SUBSPACE:
369 case OPTION_STUBGROUP_SIZE:
372 group_size = bfd_scan_vma (optarg, &end, 0);
374 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
379 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
381 LDEMUL_AFTER_PARSE=hppaelf_after_parse
382 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
383 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements