1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 1991-2016 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 (bfd_link_relocatable (&link_info))
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 gld${EMULATION_NAME}_after_parse ();
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);
91 elf32_hppa_init_stub_bfd (stub_file->the_bfd, &link_info);
97 lang_statement_list_type add;
98 asection *input_section;
101 /* Traverse the linker tree to find the spot where the stub goes. */
104 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
106 lang_statement_union_type *l;
109 for (; (l = *lp) != NULL; lp = &l->header.next)
111 switch (l->header.type)
113 case lang_constructors_statement_enum:
114 ret = hook_in_stub (info, &constructor_list.head);
119 case lang_output_section_statement_enum:
120 ret = hook_in_stub (info,
121 &l->output_section_statement.children.head);
126 case lang_wild_statement_enum:
127 ret = hook_in_stub (info, &l->wild_statement.children.head);
132 case lang_group_statement_enum:
133 ret = hook_in_stub (info, &l->group_statement.children.head);
138 case lang_input_section_enum:
139 if (l->input_section.section == info->input_section)
141 /* We've found our section. Insert the stub immediately
142 before its associated input section. */
143 *lp = info->add.head;
144 *(info->add.tail) = l;
149 case lang_data_statement_enum:
150 case lang_reloc_statement_enum:
151 case lang_object_symbols_statement_enum:
152 case lang_output_statement_enum:
153 case lang_target_statement_enum:
154 case lang_input_statement_enum:
155 case lang_assignment_statement_enum:
156 case lang_padding_statement_enum:
157 case lang_address_statement_enum:
158 case lang_fill_statement_enum:
170 /* Call-back for elf32_hppa_size_stubs. */
172 /* Create a new stub section, and arrange for it to be linked
173 immediately before INPUT_SECTION. */
176 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
180 asection *output_section;
181 lang_output_section_statement_type *os;
182 struct hook_stub_info info;
184 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
185 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
186 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
187 stub_sec_name, flags);
188 if (stub_sec == NULL)
191 output_section = input_section->output_section;
192 os = lang_output_section_get (output_section);
194 info.input_section = input_section;
195 lang_list_init (&info.add);
196 lang_add_section (&info.add, stub_sec, NULL, os);
198 if (info.add.head == NULL)
201 if (hook_in_stub (&info, &os->children.head))
205 einfo ("%X%P: can not make stub section: %E\n");
210 /* Another call-back for elf32_hppa_size_stubs. */
213 hppaelf_layout_sections_again (void)
215 /* If we have changed sizes of the stub sections, then we need
216 to recalculate all the section offsets. This may mean we need to
217 add even more stubs. */
218 gld${EMULATION_NAME}_map_segments (TRUE);
219 need_laying_out = -1;
224 build_section_lists (lang_statement_union_type *statement)
226 if (statement->header.type == lang_input_section_enum)
228 asection *i = statement->input_section.section;
230 if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
231 && (i->flags & SEC_EXCLUDE) == 0
232 && i->output_section != NULL
233 && i->output_section->owner == link_info.output_bfd)
235 elf32_hppa_next_input_section (&link_info, i);
241 /* For the PA we use this opportunity to size and build linker stubs. */
244 gld${EMULATION_NAME}_after_allocation (void)
248 /* bfd_elf_discard_info just plays with data and debugging sections,
249 ie. doesn't affect code size, so we can delay resizing the
250 sections. It's likely we'll resize everything in the process of
252 ret = bfd_elf_discard_info (link_info.output_bfd, &link_info);
255 einfo ("%X%P: .eh_frame/.stab edit: %E\n");
261 /* If generating a relocatable output file, then we don't
262 have to examine the relocs. */
263 if (stub_file != NULL && !bfd_link_relocatable (&link_info))
265 ret = elf32_hppa_setup_section_lists (link_info.output_bfd, &link_info);
270 einfo ("%X%P: can not size stub section: %E\n");
274 lang_for_each_statement (build_section_lists);
276 /* Call into the BFD backend to do the real work. */
277 if (! elf32_hppa_size_stubs (link_info.output_bfd,
282 &hppaelf_add_stub_section,
283 &hppaelf_layout_sections_again))
285 einfo ("%X%P: can not size stub section: %E\n");
291 if (need_laying_out != -1)
292 gld${EMULATION_NAME}_map_segments (need_laying_out);
294 if (!bfd_link_relocatable (&link_info))
296 /* Set the global data pointer. */
297 if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
299 einfo ("%X%P: can not set gp\n");
303 /* Now build the linker stubs. */
304 if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
306 if (! elf32_hppa_build_stubs (&link_info))
307 einfo ("%X%P: can not build stubs: %E\n");
313 /* Avoid processing the fake stub_file in vercheck, stat_needed and
314 check_needed routines. */
316 static void (*real_func) (lang_input_statement_type *);
318 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
325 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
328 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
331 #define lang_for_each_input_file hppa_lang_for_each_input_file
335 # Define some shell vars to insert bits of code into the standard elf
336 # parse_args and list_options functions.
338 PARSE_AND_LIST_PROLOGUE='
339 #define OPTION_MULTI_SUBSPACE 301
340 #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
343 PARSE_AND_LIST_LONGOPTS='
344 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
345 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
348 PARSE_AND_LIST_OPTIONS='
350 --multi-subspace Generate import and export stubs to support\n\
351 multiple sub-space shared libraries\n"
354 --stub-group-size=N Maximum size of a group of input sections that\n\
355 can be handled by one stub section. A negative\n\
356 value locates all stubs before their branches\n\
357 (with a group size of -N), while a positive\n\
358 value allows two groups of input sections, one\n\
359 before, and one after each stub section.\n\
360 Values of +/-1 indicate the linker should\n\
361 choose suitable defaults.\n"
365 PARSE_AND_LIST_ARGS_CASES='
366 case OPTION_MULTI_SUBSPACE:
370 case OPTION_STUBGROUP_SIZE:
373 group_size = bfd_scan_vma (optarg, &end, 0);
375 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
380 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
382 LDEMUL_AFTER_PARSE=hppaelf_after_parse
383 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
384 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements