| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003 |
| 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 | # |
| 25 | cat >>e${EMULATION_NAME}.c <<EOF |
| 26 | |
| 27 | #include "ldctor.h" |
| 28 | #include "elf32-hppa.h" |
| 29 | |
| 30 | |
| 31 | /* Fake input file for stubs. */ |
| 32 | static lang_input_statement_type *stub_file; |
| 33 | |
| 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 |
| 36 | stubs. */ |
| 37 | static int multi_subspace = 0; |
| 38 | |
| 39 | /* Whether we need to call hppa_layout_sections_again. */ |
| 40 | static int need_laying_out = 0; |
| 41 | |
| 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; |
| 46 | |
| 47 | /* Stops the linker merging .text sections on a relocatable link, |
| 48 | and adds millicode library to the list of input files. */ |
| 49 | |
| 50 | static void |
| 51 | hppaelf_after_parse (void) |
| 52 | { |
| 53 | if (link_info.relocatable) |
| 54 | lang_add_unique (".text"); |
| 55 | |
| 56 | /* Enable this once we split millicode stuff from libgcc: |
| 57 | lang_add_input_file ("milli", |
| 58 | lang_input_file_is_l_enum, |
| 59 | NULL); |
| 60 | */ |
| 61 | } |
| 62 | |
| 63 | /* This is called before the input files are opened. We create a new |
| 64 | fake input file to hold the stub sections. */ |
| 65 | |
| 66 | static void |
| 67 | hppaelf_create_output_section_statements (void) |
| 68 | { |
| 69 | extern const bfd_target bfd_elf32_hppa_linux_vec; |
| 70 | extern const bfd_target bfd_elf32_hppa_nbsd_vec; |
| 71 | extern const bfd_target bfd_elf32_hppa_vec; |
| 72 | |
| 73 | if (link_info.hash->creator != &bfd_elf32_hppa_linux_vec |
| 74 | && link_info.hash->creator != &bfd_elf32_hppa_nbsd_vec |
| 75 | && link_info.hash->creator != &bfd_elf32_hppa_vec) |
| 76 | return; |
| 77 | |
| 78 | stub_file = lang_add_input_file ("linker stubs", |
| 79 | lang_input_file_is_fake_enum, |
| 80 | NULL); |
| 81 | stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); |
| 82 | if (stub_file->the_bfd == NULL |
| 83 | || ! bfd_set_arch_mach (stub_file->the_bfd, |
| 84 | bfd_get_arch (output_bfd), |
| 85 | bfd_get_mach (output_bfd))) |
| 86 | { |
| 87 | einfo ("%X%P: can not create BFD %E\n"); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | ldlang_add_file (stub_file); |
| 92 | } |
| 93 | |
| 94 | |
| 95 | struct hook_stub_info |
| 96 | { |
| 97 | lang_statement_list_type add; |
| 98 | asection *input_section; |
| 99 | }; |
| 100 | |
| 101 | /* Traverse the linker tree to find the spot where the stub goes. */ |
| 102 | |
| 103 | static bfd_boolean |
| 104 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) |
| 105 | { |
| 106 | lang_statement_union_type *l; |
| 107 | bfd_boolean ret; |
| 108 | |
| 109 | for (; (l = *lp) != NULL; lp = &l->header.next) |
| 110 | { |
| 111 | switch (l->header.type) |
| 112 | { |
| 113 | case lang_constructors_statement_enum: |
| 114 | ret = hook_in_stub (info, &constructor_list.head); |
| 115 | if (ret) |
| 116 | return ret; |
| 117 | break; |
| 118 | |
| 119 | case lang_output_section_statement_enum: |
| 120 | ret = hook_in_stub (info, |
| 121 | &l->output_section_statement.children.head); |
| 122 | if (ret) |
| 123 | return ret; |
| 124 | break; |
| 125 | |
| 126 | case lang_wild_statement_enum: |
| 127 | ret = hook_in_stub (info, &l->wild_statement.children.head); |
| 128 | if (ret) |
| 129 | return ret; |
| 130 | break; |
| 131 | |
| 132 | case lang_group_statement_enum: |
| 133 | ret = hook_in_stub (info, &l->group_statement.children.head); |
| 134 | if (ret) |
| 135 | return ret; |
| 136 | break; |
| 137 | |
| 138 | case lang_input_section_enum: |
| 139 | if (l->input_section.section == info->input_section) |
| 140 | { |
| 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; |
| 145 | return TRUE; |
| 146 | } |
| 147 | break; |
| 148 | |
| 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: |
| 159 | break; |
| 160 | |
| 161 | default: |
| 162 | FAIL (); |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | return FALSE; |
| 167 | } |
| 168 | |
| 169 | |
| 170 | /* Call-back for elf32_hppa_size_stubs. */ |
| 171 | |
| 172 | /* Create a new stub section, and arrange for it to be linked |
| 173 | immediately before INPUT_SECTION. */ |
| 174 | |
| 175 | static asection * |
| 176 | hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section) |
| 177 | { |
| 178 | asection *stub_sec; |
| 179 | flagword flags; |
| 180 | asection *output_section; |
| 181 | const char *secname; |
| 182 | lang_output_section_statement_type *os; |
| 183 | struct hook_stub_info info; |
| 184 | |
| 185 | stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name); |
| 186 | if (stub_sec == NULL) |
| 187 | goto err_ret; |
| 188 | |
| 189 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| 190 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); |
| 191 | if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags)) |
| 192 | goto err_ret; |
| 193 | |
| 194 | output_section = input_section->output_section; |
| 195 | secname = bfd_get_section_name (output_section->owner, output_section); |
| 196 | os = lang_output_section_find (secname); |
| 197 | |
| 198 | info.input_section = input_section; |
| 199 | lang_list_init (&info.add); |
| 200 | lang_add_section (&info.add, stub_sec, os, stub_file); |
| 201 | |
| 202 | if (info.add.head == NULL) |
| 203 | goto err_ret; |
| 204 | |
| 205 | if (hook_in_stub (&info, &os->children.head)) |
| 206 | return stub_sec; |
| 207 | |
| 208 | err_ret: |
| 209 | einfo ("%X%P: can not make stub section: %E\n"); |
| 210 | return NULL; |
| 211 | } |
| 212 | |
| 213 | |
| 214 | /* Another call-back for elf32_hppa_size_stubs. */ |
| 215 | |
| 216 | static void |
| 217 | hppaelf_layout_sections_again (void) |
| 218 | { |
| 219 | /* If we have changed sizes of the stub sections, then we need |
| 220 | to recalculate all the section offsets. This may mean we need to |
| 221 | add even more stubs. */ |
| 222 | need_laying_out = 0; |
| 223 | |
| 224 | lang_reset_memory_regions (); |
| 225 | |
| 226 | /* Resize the sections. */ |
| 227 | lang_size_sections (stat_ptr->head, abs_output_section, |
| 228 | &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE); |
| 229 | |
| 230 | /* Redo special stuff. */ |
| 231 | ldemul_after_allocation (); |
| 232 | |
| 233 | /* Do the assignments again. */ |
| 234 | lang_do_assignments (stat_ptr->head, abs_output_section, |
| 235 | (fill_type *) 0, (bfd_vma) 0); |
| 236 | } |
| 237 | |
| 238 | |
| 239 | static void |
| 240 | build_section_lists (lang_statement_union_type *statement) |
| 241 | { |
| 242 | if (statement->header.type == lang_input_section_enum |
| 243 | && !statement->input_section.ifile->just_syms_flag |
| 244 | && (statement->input_section.section->flags & SEC_EXCLUDE) == 0 |
| 245 | && statement->input_section.section->output_section != NULL |
| 246 | && statement->input_section.section->output_section->owner == output_bfd) |
| 247 | { |
| 248 | elf32_hppa_next_input_section (&link_info, |
| 249 | statement->input_section.section); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | |
| 254 | /* Final emulation specific call. For the PA we use this opportunity |
| 255 | to build linker stubs. */ |
| 256 | |
| 257 | static void |
| 258 | gld${EMULATION_NAME}_finish (void) |
| 259 | { |
| 260 | /* bfd_elf_discard_info just plays with debugging sections, |
| 261 | ie. doesn't affect any code, so we can delay resizing the |
| 262 | sections. It's likely we'll resize everything in the process of |
| 263 | adding stubs. */ |
| 264 | if (bfd_elf_discard_info (output_bfd, &link_info)) |
| 265 | need_laying_out = 1; |
| 266 | |
| 267 | /* If generating a relocatable output file, then we don't |
| 268 | have to examine the relocs. */ |
| 269 | if (stub_file != NULL && !link_info.relocatable) |
| 270 | { |
| 271 | int ret = elf32_hppa_setup_section_lists (output_bfd, &link_info); |
| 272 | |
| 273 | if (ret != 0) |
| 274 | { |
| 275 | if (ret < 0) |
| 276 | { |
| 277 | einfo ("%X%P: can not size stub section: %E\n"); |
| 278 | return; |
| 279 | } |
| 280 | |
| 281 | lang_for_each_statement (build_section_lists); |
| 282 | |
| 283 | /* Call into the BFD backend to do the real work. */ |
| 284 | if (! elf32_hppa_size_stubs (output_bfd, |
| 285 | stub_file->the_bfd, |
| 286 | &link_info, |
| 287 | multi_subspace, |
| 288 | group_size, |
| 289 | &hppaelf_add_stub_section, |
| 290 | &hppaelf_layout_sections_again)) |
| 291 | { |
| 292 | einfo ("%X%P: can not size stub section: %E\n"); |
| 293 | return; |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | if (need_laying_out) |
| 299 | hppaelf_layout_sections_again (); |
| 300 | |
| 301 | if (! link_info.relocatable) |
| 302 | { |
| 303 | /* Set the global data pointer. */ |
| 304 | if (! elf32_hppa_set_gp (output_bfd, &link_info)) |
| 305 | { |
| 306 | einfo ("%X%P: can not set gp\n"); |
| 307 | return; |
| 308 | } |
| 309 | |
| 310 | /* Now build the linker stubs. */ |
| 311 | if (stub_file != NULL && stub_file->the_bfd->sections != NULL) |
| 312 | { |
| 313 | if (! elf32_hppa_build_stubs (&link_info)) |
| 314 | einfo ("%X%P: can not build stubs: %E\n"); |
| 315 | } |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | |
| 320 | /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| 321 | check_needed routines. */ |
| 322 | |
| 323 | static void (*real_func) (lang_input_statement_type *); |
| 324 | |
| 325 | static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l) |
| 326 | { |
| 327 | if (l != stub_file) |
| 328 | (*real_func) (l); |
| 329 | } |
| 330 | |
| 331 | static void |
| 332 | hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) |
| 333 | { |
| 334 | real_func = func; |
| 335 | lang_for_each_input_file (&hppa_for_each_input_file_wrapper); |
| 336 | } |
| 337 | |
| 338 | #define lang_for_each_input_file hppa_lang_for_each_input_file |
| 339 | |
| 340 | EOF |
| 341 | |
| 342 | # Define some shell vars to insert bits of code into the standard elf |
| 343 | # parse_args and list_options functions. |
| 344 | # |
| 345 | PARSE_AND_LIST_PROLOGUE=' |
| 346 | #define OPTION_MULTI_SUBSPACE 301 |
| 347 | #define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1) |
| 348 | ' |
| 349 | |
| 350 | PARSE_AND_LIST_LONGOPTS=' |
| 351 | { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE }, |
| 352 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, |
| 353 | ' |
| 354 | |
| 355 | PARSE_AND_LIST_OPTIONS=' |
| 356 | fprintf (file, _("\ |
| 357 | --multi-subspace Generate import and export stubs to support\n\ |
| 358 | multiple sub-space shared libraries\n" |
| 359 | )); |
| 360 | fprintf (file, _("\ |
| 361 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ |
| 362 | handled by one stub section. A negative value\n\ |
| 363 | locates all stubs before their branches (with a\n\ |
| 364 | group size of -N), while a positive value allows\n\ |
| 365 | two groups of input sections, one before, and one\n\ |
| 366 | after each stub section. Values of +/-1 indicate\n\ |
| 367 | the linker should choose suitable defaults.\n" |
| 368 | )); |
| 369 | ' |
| 370 | |
| 371 | PARSE_AND_LIST_ARGS_CASES=' |
| 372 | case OPTION_MULTI_SUBSPACE: |
| 373 | multi_subspace = 1; |
| 374 | break; |
| 375 | |
| 376 | case OPTION_STUBGROUP_SIZE: |
| 377 | { |
| 378 | const char *end; |
| 379 | group_size = bfd_scan_vma (optarg, &end, 0); |
| 380 | if (*end) |
| 381 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); |
| 382 | } |
| 383 | break; |
| 384 | ' |
| 385 | |
| 386 | # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation |
| 387 | # |
| 388 | LDEMUL_AFTER_PARSE=hppaelf_after_parse |
| 389 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |
| 390 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements |