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252b5132 1# This shell script emits a C file. -*- C -*-
a2b64bed 2# Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001
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3# Free Software Foundation, Inc.
4#
5# This file is part of GLD, the Gnu Linker.
6#
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 2 of the License, or
10# (at your option) any later version.
11#
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.
16#
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20#
21
22# This file is sourced from elf32.em, and defines extra hppa-elf
23# specific routines.
24#
25cat >>e${EMULATION_NAME}.c <<EOF
26
252b5132 27#include "ldctor.h"
4900fc06 28#include "elf32-hppa.h"
252b5132 29
ffd6e9de 30static void hppaelf_after_parse PARAMS((void));
4900fc06 31static void hppaelf_create_output_section_statements PARAMS ((void));
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32static asection *hppaelf_add_stub_section
33 PARAMS ((const char *, asection *));
c56feb2b
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34static void hppaelf_layout_sections_again PARAMS ((void));
35static void gld${EMULATION_NAME}_finish PARAMS ((void));
252b5132
RH
36
37
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38/* Fake input file for stubs. */
39static lang_input_statement_type *stub_file;
252b5132 40
3231d22e
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41/* Type of import/export stubs to build. For a single sub-space model,
42 we can build smaller import stubs and there is no need for export
43 stubs. */
44static int multi_subspace = 0;
252b5132 45
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46/* Whether we need to call hppa_layout_sections_again. */
47static int need_laying_out = 0;
48
47d89dba
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49/* Maximum size of a group of input sections that can be handled by
50 one stub section. A value of +/-1 indicates the bfd back-end
51 should use a suitable default size. */
52static bfd_signed_vma group_size = 1;
252b5132 53
ffd6e9de
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54/* Stops the linker merging .text sections on a relocatable link,
55 and adds millicode library to the list of input files. */
56
57static void
58hppaelf_after_parse ()
59{
60 if (link_info.relocateable)
61 lang_add_unique (".text");
62#if 0 /* enable this once we split millicode stuff from libgcc */
63 else
64 lang_add_input_file ("milli",
65 lang_input_file_is_l_enum,
66 NULL);
67#endif
68}
69
252b5132 70/* This is called before the input files are opened. We create a new
4900fc06 71 fake input file to hold the stub sections. */
252b5132
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72
73static void
74hppaelf_create_output_section_statements ()
75{
76 stub_file = lang_add_input_file ("linker stubs",
77 lang_input_file_is_fake_enum,
78 NULL);
79 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
80 if (stub_file->the_bfd == NULL
81 || ! bfd_set_arch_mach (stub_file->the_bfd,
82 bfd_get_arch (output_bfd),
83 bfd_get_mach (output_bfd)))
84 {
85 einfo ("%X%P: can not create BFD %E\n");
86 return;
87 }
88
252b5132
RH
89 ldlang_add_file (stub_file);
90}
91
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92
93struct hook_stub_info
94{
95 lang_statement_list_type add;
96 asection *input_section;
97};
98
99/* Traverse the linker tree to find the spot where the stub goes. */
100
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101static boolean hook_in_stub
102 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
103
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104static boolean
105hook_in_stub (info, lp)
106 struct hook_stub_info *info;
107 lang_statement_union_type **lp;
108{
109 lang_statement_union_type *l;
110 boolean ret;
111
bba1a0c0 112 for (; (l = *lp) != NULL; lp = &l->header.next)
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113 {
114 switch (l->header.type)
115 {
116 case lang_constructors_statement_enum:
117 ret = hook_in_stub (info, &constructor_list.head);
118 if (ret)
119 return ret;
120 break;
121
122 case lang_output_section_statement_enum:
123 ret = hook_in_stub (info,
124 &l->output_section_statement.children.head);
125 if (ret)
126 return ret;
127 break;
128
129 case lang_wild_statement_enum:
130 ret = hook_in_stub (info, &l->wild_statement.children.head);
131 if (ret)
132 return ret;
133 break;
134
135 case lang_group_statement_enum:
136 ret = hook_in_stub (info, &l->group_statement.children.head);
137 if (ret)
138 return ret;
139 break;
140
141 case lang_input_section_enum:
142 if (l->input_section.section == info->input_section)
143 {
144 /* We've found our section. Insert the stub immediately
145 before its associated input section. */
146 *lp = info->add.head;
147 *(info->add.tail) = l;
148 return true;
149 }
150 break;
151
152 case lang_data_statement_enum:
153 case lang_reloc_statement_enum:
154 case lang_object_symbols_statement_enum:
155 case lang_output_statement_enum:
156 case lang_target_statement_enum:
157 case lang_input_statement_enum:
158 case lang_assignment_statement_enum:
159 case lang_padding_statement_enum:
160 case lang_address_statement_enum:
161 case lang_fill_statement_enum:
162 break;
163
164 default:
165 FAIL ();
166 break;
167 }
168 }
169 return false;
170}
171
41392f03 172
4900fc06
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173/* Call-back for elf32_hppa_size_stubs. */
174
175/* Create a new stub section, and arrange for it to be linked
176 immediately before INPUT_SECTION. */
177
178static asection *
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179hppaelf_add_stub_section (stub_sec_name, input_section)
180 const char *stub_sec_name;
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181 asection *input_section;
182{
183 asection *stub_sec;
184 flagword flags;
185 asection *output_section;
186 const char *secname;
187 lang_output_section_statement_type *os;
188 struct hook_stub_info info;
189
25f72752 190 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
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191 if (stub_sec == NULL)
192 goto err_ret;
193
194 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
3231d22e 195 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
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196 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
197 goto err_ret;
198
199 output_section = input_section->output_section;
200 secname = bfd_get_section_name (output_section->owner, output_section);
201 os = lang_output_section_find (secname);
202
203 info.input_section = input_section;
204 lang_list_init (&info.add);
39dcfe18 205 lang_add_section (&info.add, stub_sec, os, stub_file);
4900fc06
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206
207 if (info.add.head == NULL)
208 goto err_ret;
209
210 if (hook_in_stub (&info, &os->children.head))
211 return stub_sec;
212
213 err_ret:
214 einfo ("%X%P: can not make stub section: %E\n");
215 return NULL;
216}
217
41392f03 218
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219/* Another call-back for elf32_hppa_size_stubs. */
220
221static void
c56feb2b 222hppaelf_layout_sections_again ()
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223{
224 /* If we have changed sizes of the stub sections, then we need
225 to recalculate all the section offsets. This may mean we need to
226 add even more stubs. */
c56feb2b 227 need_laying_out = 0;
4900fc06 228
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229 /* Resize the sections. */
230 lang_size_sections (stat_ptr->head, abs_output_section,
ca0b5847 231 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
4900fc06
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232
233 /* Redo special stuff. */
234 ldemul_after_allocation ();
235
236 /* Do the assignments again. */
237 lang_do_assignments (stat_ptr->head, abs_output_section,
238 (fill_type) 0, (bfd_vma) 0);
239}
240
241
252b5132
RH
242/* Final emulation specific call. For the PA we use this opportunity
243 to build linker stubs. */
244
245static void
c56feb2b 246gld${EMULATION_NAME}_finish ()
252b5132 247{
ffd6e9de 248 /* If generating a relocatable output file, then we don't
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249 have to examine the relocs. */
250 if (link_info.relocateable)
251 return;
252
c56feb2b
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253 /* bfd_elf32_discard_info just plays with debugging sections,
254 ie. doesn't affect any code, so we can delay resizing the
255 sections. It's likely we'll resize everything in the process of
256 adding stubs. */
65765700 257 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
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258 need_laying_out = 1;
259
252b5132 260 /* Call into the BFD backend to do the real work. */
25f72752
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261 if (! elf32_hppa_size_stubs (output_bfd,
262 stub_file->the_bfd,
41392f03 263 &link_info,
25f72752 264 multi_subspace,
47d89dba 265 group_size,
41392f03 266 &hppaelf_add_stub_section,
c56feb2b 267 &hppaelf_layout_sections_again))
252b5132
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268 {
269 einfo ("%X%P: can not size stub section: %E\n");
270 return;
271 }
4900fc06 272
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273 if (need_laying_out)
274 hppaelf_layout_sections_again ();
275
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276 /* Set the global data pointer. */
277 if (! elf32_hppa_set_gp (output_bfd, &link_info))
278 {
279 einfo ("%X%P: can not set gp\n");
280 return;
281 }
282
4900fc06
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283 /* Now build the linker stubs. */
284 if (stub_file->the_bfd->sections != NULL)
252b5132 285 {
3231d22e 286 if (! elf32_hppa_build_stubs (&link_info))
4900fc06
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287 einfo ("%X%P: can not build stubs: %E\n");
288 }
289}
290
3231d22e
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291
292/* Avoid processing the fake stub_file in vercheck, stat_needed and
293 check_needed routines. */
294
295static void hppa_for_each_input_file_wrapper
296 PARAMS ((lang_input_statement_type *));
297static void hppa_lang_for_each_input_file
298 PARAMS ((void (*) (lang_input_statement_type *)));
299
300static void (*real_func) PARAMS ((lang_input_statement_type *));
301
302static void hppa_for_each_input_file_wrapper (l)
303 lang_input_statement_type *l;
304{
305 if (l != stub_file)
306 (*real_func) (l);
307}
308
309static void
310hppa_lang_for_each_input_file (func)
311 void (*func) PARAMS ((lang_input_statement_type *));
312{
313 real_func = func;
314 lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
315}
316
317#define lang_for_each_input_file hppa_lang_for_each_input_file
318
252b5132
RH
319EOF
320
3231d22e
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321# Define some shell vars to insert bits of code into the standard elf
322# parse_args and list_options functions.
323#
324PARSE_AND_LIST_PROLOGUE='
325#define OPTION_MULTI_SUBSPACE 301
47d89dba 326#define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
3231d22e
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327'
328
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329# The options are repeated below so that no abbreviations are allowed.
330# Otherwise -s matches stub-group-size
3231d22e 331PARSE_AND_LIST_LONGOPTS='
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332 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
333 { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
334 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
335 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
3231d22e
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336'
337
338PARSE_AND_LIST_OPTIONS='
339 fprintf (file, _("\
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340 --multi-subspace Generate import and export stubs to support\n\
341 multiple sub-space shared libraries\n"
47d89dba
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342 ));
343 fprintf (file, _("\
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344 --stub-group-size=N Maximum size of a group of input sections that can be\n\
345 handled by one stub section. A negative value\n\
346 locates all stubs before their branches (with a\n\
347 group size of -N), while a positive value allows\n\
348 two groups of input sections, one before, and one\n\
349 after each stub section. Values of +/-1 indicate\n\
350 the linker should choose suitable defaults.\n"
3231d22e
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351 ));
352'
353
354PARSE_AND_LIST_ARGS_CASES='
355 case OPTION_MULTI_SUBSPACE:
356 multi_subspace = 1;
357 break;
47d89dba
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358
359 case OPTION_STUBGROUP_SIZE:
360 {
361 const char *end;
362 group_size = bfd_scan_vma (optarg, &end, 0);
363 if (*end)
364 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
365 }
366 break;
3231d22e
AM
367'
368
369# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
41392f03 370#
ffd6e9de 371LDEMUL_AFTER_PARSE=hppaelf_after_parse
c56feb2b 372LDEMUL_FINISH=gld${EMULATION_NAME}_finish
41392f03 373LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements