1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
3 # 2005, 2007 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,
64 /* This is called before the input files are opened. We create a new
65 fake input file to hold the stub sections. */
68 hppaelf_create_output_section_statements (void)
70 extern const bfd_target bfd_elf32_hppa_linux_vec;
71 extern const bfd_target bfd_elf32_hppa_nbsd_vec;
72 extern const bfd_target bfd_elf32_hppa_vec;
74 if (link_info.hash->creator != &bfd_elf32_hppa_linux_vec
75 && link_info.hash->creator != &bfd_elf32_hppa_nbsd_vec
76 && link_info.hash->creator != &bfd_elf32_hppa_vec)
79 stub_file = lang_add_input_file ("linker stubs",
80 lang_input_file_is_fake_enum,
82 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
83 if (stub_file->the_bfd == NULL
84 || ! bfd_set_arch_mach (stub_file->the_bfd,
85 bfd_get_arch (output_bfd),
86 bfd_get_mach (output_bfd)))
88 einfo ("%X%P: can not create BFD %E\n");
92 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
93 ldlang_add_file (stub_file);
99 lang_statement_list_type add;
100 asection *input_section;
103 /* Traverse the linker tree to find the spot where the stub goes. */
106 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
108 lang_statement_union_type *l;
111 for (; (l = *lp) != NULL; lp = &l->header.next)
113 switch (l->header.type)
115 case lang_constructors_statement_enum:
116 ret = hook_in_stub (info, &constructor_list.head);
121 case lang_output_section_statement_enum:
122 ret = hook_in_stub (info,
123 &l->output_section_statement.children.head);
128 case lang_wild_statement_enum:
129 ret = hook_in_stub (info, &l->wild_statement.children.head);
134 case lang_group_statement_enum:
135 ret = hook_in_stub (info, &l->group_statement.children.head);
140 case lang_input_section_enum:
141 if (l->input_section.section == info->input_section)
143 /* We've found our section. Insert the stub immediately
144 before its associated input section. */
145 *lp = info->add.head;
146 *(info->add.tail) = l;
151 case lang_data_statement_enum:
152 case lang_reloc_statement_enum:
153 case lang_object_symbols_statement_enum:
154 case lang_output_statement_enum:
155 case lang_target_statement_enum:
156 case lang_input_statement_enum:
157 case lang_assignment_statement_enum:
158 case lang_padding_statement_enum:
159 case lang_address_statement_enum:
160 case lang_fill_statement_enum:
172 /* Call-back for elf32_hppa_size_stubs. */
174 /* Create a new stub section, and arrange for it to be linked
175 immediately before INPUT_SECTION. */
178 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
182 asection *output_section;
184 lang_output_section_statement_type *os;
185 struct hook_stub_info info;
187 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
188 if (stub_sec == NULL)
191 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
192 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
193 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
196 output_section = input_section->output_section;
197 secname = bfd_get_section_name (output_section->owner, output_section);
198 os = lang_output_section_find (secname);
200 info.input_section = input_section;
201 lang_list_init (&info.add);
202 lang_add_section (&info.add, stub_sec, os);
204 if (info.add.head == NULL)
207 if (hook_in_stub (&info, &os->children.head))
211 einfo ("%X%P: can not make stub section: %E\n");
216 /* Another call-back for elf32_hppa_size_stubs. */
219 hppaelf_layout_sections_again (void)
221 /* If we have changed sizes of the stub sections, then we need
222 to recalculate all the section offsets. This may mean we need to
223 add even more stubs. */
224 gld${EMULATION_NAME}_map_segments (TRUE);
225 need_laying_out = -1;
230 build_section_lists (lang_statement_union_type *statement)
232 if (statement->header.type == lang_input_section_enum)
234 asection *i = statement->input_section.section;
236 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
237 && (i->flags & SEC_EXCLUDE) == 0
238 && i->output_section != NULL
239 && i->output_section->owner == output_bfd)
241 elf32_hppa_next_input_section (&link_info, i);
247 /* Final emulation specific call. For the PA we use this opportunity
248 to build linker stubs. */
251 gld${EMULATION_NAME}_finish (void)
253 /* bfd_elf_discard_info just plays with debugging sections,
254 ie. doesn't affect any code, so we can delay resizing the
255 sections. It's likely we'll resize everything in the process of
257 if (bfd_elf_discard_info (output_bfd, &link_info))
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 int ret = elf32_hppa_setup_section_lists (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 (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 (! link_info.relocatable)
296 /* Set the global data pointer. */
297 if (! elf32_hppa_set_gp (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");
315 /* Avoid processing the fake stub_file in vercheck, stat_needed and
316 check_needed routines. */
318 static void (*real_func) (lang_input_statement_type *);
320 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
327 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
330 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
333 #define lang_for_each_input_file hppa_lang_for_each_input_file
337 # Define some shell vars to insert bits of code into the standard elf
338 # parse_args and list_options functions.
340 PARSE_AND_LIST_PROLOGUE='
341 #define OPTION_MULTI_SUBSPACE 301
342 #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
345 PARSE_AND_LIST_LONGOPTS='
346 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
347 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
350 PARSE_AND_LIST_OPTIONS='
352 --multi-subspace Generate import and export stubs to support\n\
353 multiple sub-space shared libraries\n"
356 --stub-group-size=N Maximum size of a group of input sections that can be\n\
357 handled by one stub section. A negative value\n\
358 locates all stubs before their branches (with a\n\
359 group size of -N), while a positive value allows\n\
360 two groups of input sections, one before, and one\n\
361 after each stub section. Values of +/-1 indicate\n\
362 the linker should choose suitable defaults.\n"
366 PARSE_AND_LIST_ARGS_CASES='
367 case OPTION_MULTI_SUBSPACE:
371 case OPTION_STUBGROUP_SIZE:
374 group_size = bfd_scan_vma (optarg, &end, 0);
376 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
381 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
383 LDEMUL_AFTER_PARSE=hppaelf_after_parse
384 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
385 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements