1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
3 # 2005, 2007, 2008 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 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
71 && elf_object_id (link_info.output_bfd) == HPPA_ELF_TDATA))
74 stub_file = lang_add_input_file ("linker stubs",
75 lang_input_file_is_fake_enum,
77 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
78 if (stub_file->the_bfd == NULL
79 || ! bfd_set_arch_mach (stub_file->the_bfd,
80 bfd_get_arch (link_info.output_bfd),
81 bfd_get_mach (link_info.output_bfd)))
83 einfo ("%X%P: can not create BFD %E\n");
87 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
88 ldlang_add_file (stub_file);
94 lang_statement_list_type add;
95 asection *input_section;
98 /* Traverse the linker tree to find the spot where the stub goes. */
101 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
103 lang_statement_union_type *l;
106 for (; (l = *lp) != NULL; lp = &l->header.next)
108 switch (l->header.type)
110 case lang_constructors_statement_enum:
111 ret = hook_in_stub (info, &constructor_list.head);
116 case lang_output_section_statement_enum:
117 ret = hook_in_stub (info,
118 &l->output_section_statement.children.head);
123 case lang_wild_statement_enum:
124 ret = hook_in_stub (info, &l->wild_statement.children.head);
129 case lang_group_statement_enum:
130 ret = hook_in_stub (info, &l->group_statement.children.head);
135 case lang_input_section_enum:
136 if (l->input_section.section == info->input_section)
138 /* We've found our section. Insert the stub immediately
139 before its associated input section. */
140 *lp = info->add.head;
141 *(info->add.tail) = l;
146 case lang_data_statement_enum:
147 case lang_reloc_statement_enum:
148 case lang_object_symbols_statement_enum:
149 case lang_output_statement_enum:
150 case lang_target_statement_enum:
151 case lang_input_statement_enum:
152 case lang_assignment_statement_enum:
153 case lang_padding_statement_enum:
154 case lang_address_statement_enum:
155 case lang_fill_statement_enum:
167 /* Call-back for elf32_hppa_size_stubs. */
169 /* Create a new stub section, and arrange for it to be linked
170 immediately before INPUT_SECTION. */
173 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
177 asection *output_section;
179 lang_output_section_statement_type *os;
180 struct hook_stub_info info;
182 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
183 if (stub_sec == NULL)
186 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
187 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
188 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
191 output_section = input_section->output_section;
192 secname = bfd_get_section_name (output_section->owner, output_section);
193 os = lang_output_section_find (secname);
195 info.input_section = input_section;
196 lang_list_init (&info.add);
197 lang_add_section (&info.add, stub_sec, os);
199 if (info.add.head == NULL)
202 if (hook_in_stub (&info, &os->children.head))
206 einfo ("%X%P: can not make stub section: %E\n");
211 /* Another call-back for elf32_hppa_size_stubs. */
214 hppaelf_layout_sections_again (void)
216 /* If we have changed sizes of the stub sections, then we need
217 to recalculate all the section offsets. This may mean we need to
218 add even more stubs. */
219 gld${EMULATION_NAME}_map_segments (TRUE);
220 need_laying_out = -1;
225 build_section_lists (lang_statement_union_type *statement)
227 if (statement->header.type == lang_input_section_enum)
229 asection *i = statement->input_section.section;
231 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
232 && (i->flags & SEC_EXCLUDE) == 0
233 && i->output_section != NULL
234 && i->output_section->owner == link_info.output_bfd)
236 elf32_hppa_next_input_section (&link_info, i);
242 /* Final emulation specific call. For the PA we use this opportunity
243 to build linker stubs. */
246 gld${EMULATION_NAME}_finish (void)
248 /* bfd_elf_discard_info just plays with debugging sections,
249 ie. doesn't affect any code, 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");
311 /* Avoid processing the fake stub_file in vercheck, stat_needed and
312 check_needed routines. */
314 static void (*real_func) (lang_input_statement_type *);
316 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
323 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
326 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
329 #define lang_for_each_input_file hppa_lang_for_each_input_file
333 # Define some shell vars to insert bits of code into the standard elf
334 # parse_args and list_options functions.
336 PARSE_AND_LIST_PROLOGUE='
337 #define OPTION_MULTI_SUBSPACE 301
338 #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
341 PARSE_AND_LIST_LONGOPTS='
342 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
343 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
346 PARSE_AND_LIST_OPTIONS='
348 --multi-subspace Generate import and export stubs to support\n\
349 multiple sub-space shared libraries\n"
352 --stub-group-size=N Maximum size of a group of input sections that\n\
353 can be handled by one stub section. A negative\n\
354 value locates all stubs before their branches\n\
355 (with a group size of -N), while a positive\n\
356 value allows two groups of input sections, one\n\
357 before, and one after each stub section.\n\
358 Values of +/-1 indicate the linker should\n\
359 choose suitable defaults.\n"
363 PARSE_AND_LIST_ARGS_CASES='
364 case OPTION_MULTI_SUBSPACE:
368 case OPTION_STUBGROUP_SIZE:
371 group_size = bfd_scan_vma (optarg, &end, 0);
373 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
378 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
380 LDEMUL_AFTER_PARSE=hppaelf_after_parse
381 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
382 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements