1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
3 # 2005, 2006, 2007, 2008, 2009, 2012 Free Software Foundation, Inc.
5 # This file is part of the GNU Binutils.
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 # This file is sourced from elf32.em, and defines extra hppa-elf
29 #include "elf32-hppa.h"
32 /* Fake input file for stubs. */
33 static lang_input_statement_type *stub_file;
35 /* Type of import/export stubs to build. For a single sub-space model,
36 we can build smaller import stubs and there is no need for export
38 static int multi_subspace = 0;
40 /* Whether we need to call hppa_layout_sections_again. */
41 static int need_laying_out = 0;
43 /* Maximum size of a group of input sections that can be handled by
44 one stub section. A value of +/-1 indicates the bfd back-end
45 should use a suitable default size. */
46 static bfd_signed_vma group_size = 1;
48 /* Stops the linker merging .text sections on a relocatable link,
49 and adds millicode library to the list of input files. */
52 hppaelf_after_parse (void)
54 if (link_info.relocatable)
55 lang_add_unique (".text");
57 /* Enable this once we split millicode stuff from libgcc:
58 lang_add_input_file ("milli",
59 lang_input_file_is_l_enum,
63 after_parse_default ();
66 /* This is called before the input files are opened. We create a new
67 fake input file to hold the stub sections. */
70 hppaelf_create_output_section_statements (void)
72 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
73 && (elf_object_id (link_info.output_bfd) == HPPA32_ELF_DATA
74 || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA)))
77 stub_file = lang_add_input_file ("linker stubs",
78 lang_input_file_is_fake_enum,
80 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
81 if (stub_file->the_bfd == NULL
82 || ! bfd_set_arch_mach (stub_file->the_bfd,
83 bfd_get_arch (link_info.output_bfd),
84 bfd_get_mach (link_info.output_bfd)))
86 einfo ("%X%P: can not create BFD %E\n");
90 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
91 ldlang_add_file (stub_file);
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;
182 lang_output_section_statement_type *os;
183 struct hook_stub_info info;
185 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
186 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
187 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
188 stub_sec_name, flags);
189 if (stub_sec == NULL)
192 output_section = input_section->output_section;
193 secname = bfd_get_section_name (output_section->owner, output_section);
194 os = lang_output_section_find (secname);
196 info.input_section = input_section;
197 lang_list_init (&info.add);
198 lang_add_section (&info.add, stub_sec, NULL, os);
200 if (info.add.head == NULL)
203 if (hook_in_stub (&info, &os->children.head))
207 einfo ("%X%P: can not make stub section: %E\n");
212 /* Another call-back for elf32_hppa_size_stubs. */
215 hppaelf_layout_sections_again (void)
217 /* If we have changed sizes of the stub sections, then we need
218 to recalculate all the section offsets. This may mean we need to
219 add even more stubs. */
220 gld${EMULATION_NAME}_map_segments (TRUE);
221 need_laying_out = -1;
226 build_section_lists (lang_statement_union_type *statement)
228 if (statement->header.type == lang_input_section_enum)
230 asection *i = statement->input_section.section;
232 if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
233 && (i->flags & SEC_EXCLUDE) == 0
234 && i->output_section != NULL
235 && i->output_section->owner == link_info.output_bfd)
237 elf32_hppa_next_input_section (&link_info, i);
243 /* For the PA we use this opportunity to size and build linker stubs. */
246 gld${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 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
255 /* If generating a relocatable output file, then we don't
256 have to examine the relocs. */
257 if (stub_file != NULL && !link_info.relocatable)
259 int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
266 einfo ("%X%P: can not size stub section: %E\n");
270 lang_for_each_statement (build_section_lists);
272 /* Call into the BFD backend to do the real work. */
273 if (! elf32_hppa_size_stubs (link_info.output_bfd,
278 &hppaelf_add_stub_section,
279 &hppaelf_layout_sections_again))
281 einfo ("%X%P: can not size stub section: %E\n");
287 if (need_laying_out != -1)
288 gld${EMULATION_NAME}_map_segments (need_laying_out);
290 if (! link_info.relocatable)
292 /* Set the global data pointer. */
293 if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
295 einfo ("%X%P: can not set gp\n");
299 /* Now build the linker stubs. */
300 if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
302 if (! elf32_hppa_build_stubs (&link_info))
303 einfo ("%X%P: can not build stubs: %E\n");
309 /* Avoid processing the fake stub_file in vercheck, stat_needed and
310 check_needed routines. */
312 static void (*real_func) (lang_input_statement_type *);
314 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
321 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
324 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
327 #define lang_for_each_input_file hppa_lang_for_each_input_file
331 # Define some shell vars to insert bits of code into the standard elf
332 # parse_args and list_options functions.
334 PARSE_AND_LIST_PROLOGUE='
335 #define OPTION_MULTI_SUBSPACE 301
336 #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
339 PARSE_AND_LIST_LONGOPTS='
340 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
341 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
344 PARSE_AND_LIST_OPTIONS='
346 --multi-subspace Generate import and export stubs to support\n\
347 multiple sub-space shared libraries\n"
350 --stub-group-size=N Maximum size of a group of input sections that\n\
351 can be handled by one stub section. A negative\n\
352 value locates all stubs before their branches\n\
353 (with a group size of -N), while a positive\n\
354 value allows two groups of input sections, one\n\
355 before, and one after each stub section.\n\
356 Values of +/-1 indicate the linker should\n\
357 choose suitable defaults.\n"
361 PARSE_AND_LIST_ARGS_CASES='
362 case OPTION_MULTI_SUBSPACE:
366 case OPTION_STUBGROUP_SIZE:
369 group_size = bfd_scan_vma (optarg, &end, 0);
371 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
376 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
378 LDEMUL_AFTER_PARSE=hppaelf_after_parse
379 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
380 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements