| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2009-2015 Free Software Foundation, Inc. |
| 3 | # Contributed by ARM Ltd. |
| 4 | # |
| 5 | # This file is part of the GNU Binutils. |
| 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 3 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; see the file COPYING3. If not, |
| 19 | # see <http://www.gnu.org/licenses/>. |
| 20 | # |
| 21 | |
| 22 | # This file is sourced from elf32.em, and defines extra aarch64-elf |
| 23 | # specific routines. |
| 24 | # |
| 25 | fragment <<EOF |
| 26 | |
| 27 | #include "ldctor.h" |
| 28 | #include "elf/aarch64.h" |
| 29 | |
| 30 | static int no_enum_size_warning = 0; |
| 31 | static int no_wchar_size_warning = 0; |
| 32 | static int pic_veneer = 0; |
| 33 | static int fix_erratum_835769 = 0; |
| 34 | static int fix_erratum_843419 = 0; |
| 35 | |
| 36 | static void |
| 37 | gld${EMULATION_NAME}_before_parse (void) |
| 38 | { |
| 39 | #ifndef TARGET_ /* I.e., if not generic. */ |
| 40 | ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown); |
| 41 | #endif /* not TARGET_ */ |
| 42 | input_flags.dynamic = ${DYNAMIC_LINK-TRUE}; |
| 43 | config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`; |
| 44 | config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
| 45 | } |
| 46 | |
| 47 | static void |
| 48 | aarch64_elf_before_allocation (void) |
| 49 | { |
| 50 | /* We should be able to set the size of the interworking stub section. We |
| 51 | can't do it until later if we have dynamic sections, though. */ |
| 52 | if (! elf_hash_table (&link_info)->dynamic_sections_created) |
| 53 | { |
| 54 | /* Here we rummage through the found bfds to collect information. */ |
| 55 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 56 | { |
| 57 | /* Initialise mapping tables for code/data. */ |
| 58 | bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | /* Call the standard elf routine. */ |
| 63 | gld${EMULATION_NAME}_before_allocation (); |
| 64 | } |
| 65 | |
| 66 | /* Fake input file for stubs. */ |
| 67 | static lang_input_statement_type *stub_file; |
| 68 | |
| 69 | /* Whether we need to call gldarm_layout_sections_again. */ |
| 70 | static int need_laying_out = 0; |
| 71 | |
| 72 | /* Maximum size of a group of input sections that can be handled by |
| 73 | one stub section. A value of +/-1 indicates the bfd back-end |
| 74 | should use a suitable default size. */ |
| 75 | static bfd_signed_vma group_size = 1; |
| 76 | |
| 77 | struct hook_stub_info |
| 78 | { |
| 79 | lang_statement_list_type add; |
| 80 | asection *input_section; |
| 81 | }; |
| 82 | |
| 83 | /* Traverse the linker tree to find the spot where the stub goes. */ |
| 84 | |
| 85 | static bfd_boolean |
| 86 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) |
| 87 | { |
| 88 | lang_statement_union_type *l; |
| 89 | bfd_boolean ret; |
| 90 | |
| 91 | for (; (l = *lp) != NULL; lp = &l->header.next) |
| 92 | { |
| 93 | switch (l->header.type) |
| 94 | { |
| 95 | case lang_constructors_statement_enum: |
| 96 | ret = hook_in_stub (info, &constructor_list.head); |
| 97 | if (ret) |
| 98 | return ret; |
| 99 | break; |
| 100 | |
| 101 | case lang_output_section_statement_enum: |
| 102 | ret = hook_in_stub (info, |
| 103 | &l->output_section_statement.children.head); |
| 104 | if (ret) |
| 105 | return ret; |
| 106 | break; |
| 107 | |
| 108 | case lang_wild_statement_enum: |
| 109 | ret = hook_in_stub (info, &l->wild_statement.children.head); |
| 110 | if (ret) |
| 111 | return ret; |
| 112 | break; |
| 113 | |
| 114 | case lang_group_statement_enum: |
| 115 | ret = hook_in_stub (info, &l->group_statement.children.head); |
| 116 | if (ret) |
| 117 | return ret; |
| 118 | break; |
| 119 | |
| 120 | case lang_input_section_enum: |
| 121 | if (l->input_section.section == info->input_section) |
| 122 | { |
| 123 | /* We've found our section. Insert the stub immediately |
| 124 | after its associated input section. */ |
| 125 | *(info->add.tail) = l->header.next; |
| 126 | l->header.next = info->add.head; |
| 127 | return TRUE; |
| 128 | } |
| 129 | break; |
| 130 | |
| 131 | case lang_data_statement_enum: |
| 132 | case lang_reloc_statement_enum: |
| 133 | case lang_object_symbols_statement_enum: |
| 134 | case lang_output_statement_enum: |
| 135 | case lang_target_statement_enum: |
| 136 | case lang_input_statement_enum: |
| 137 | case lang_assignment_statement_enum: |
| 138 | case lang_padding_statement_enum: |
| 139 | case lang_address_statement_enum: |
| 140 | case lang_fill_statement_enum: |
| 141 | break; |
| 142 | |
| 143 | default: |
| 144 | FAIL (); |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | return FALSE; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
| 153 | |
| 154 | /* Create a new stub section, and arrange for it to be linked |
| 155 | immediately after INPUT_SECTION. */ |
| 156 | |
| 157 | static asection * |
| 158 | elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
| 159 | asection *input_section) |
| 160 | { |
| 161 | asection *stub_sec; |
| 162 | flagword flags; |
| 163 | asection *output_section; |
| 164 | lang_output_section_statement_type *os; |
| 165 | struct hook_stub_info info; |
| 166 | |
| 167 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| 168 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); |
| 169 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, |
| 170 | stub_sec_name, flags); |
| 171 | if (stub_sec == NULL) |
| 172 | goto err_ret; |
| 173 | |
| 174 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2); |
| 175 | |
| 176 | output_section = input_section->output_section; |
| 177 | os = lang_output_section_get (output_section); |
| 178 | |
| 179 | info.input_section = input_section; |
| 180 | lang_list_init (&info.add); |
| 181 | lang_add_section (&info.add, stub_sec, NULL, os); |
| 182 | |
| 183 | if (info.add.head == NULL) |
| 184 | goto err_ret; |
| 185 | |
| 186 | if (hook_in_stub (&info, &os->children.head)) |
| 187 | return stub_sec; |
| 188 | |
| 189 | err_ret: |
| 190 | einfo ("%X%P: can not make stub section: %E\n"); |
| 191 | return NULL; |
| 192 | } |
| 193 | |
| 194 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
| 195 | |
| 196 | static void |
| 197 | gldaarch64_layout_sections_again (void) |
| 198 | { |
| 199 | /* If we have changed sizes of the stub sections, then we need |
| 200 | to recalculate all the section offsets. This may mean we need to |
| 201 | add even more stubs. */ |
| 202 | gld${EMULATION_NAME}_map_segments (TRUE); |
| 203 | need_laying_out = -1; |
| 204 | } |
| 205 | |
| 206 | static void |
| 207 | build_section_lists (lang_statement_union_type *statement) |
| 208 | { |
| 209 | if (statement->header.type == lang_input_section_enum) |
| 210 | { |
| 211 | asection *i = statement->input_section.section; |
| 212 | |
| 213 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms |
| 214 | && (i->flags & SEC_EXCLUDE) == 0 |
| 215 | && i->output_section != NULL |
| 216 | && i->output_section->owner == link_info.output_bfd) |
| 217 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | static void |
| 222 | gld${EMULATION_NAME}_after_allocation (void) |
| 223 | { |
| 224 | int ret; |
| 225 | |
| 226 | /* bfd_elf32_discard_info just plays with debugging sections, |
| 227 | ie. doesn't affect any code, so we can delay resizing the |
| 228 | sections. It's likely we'll resize everything in the process of |
| 229 | adding stubs. */ |
| 230 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
| 231 | if (ret < 0) |
| 232 | { |
| 233 | einfo ("%X%P: .eh_frame/.stab edit: %E\n"); |
| 234 | return; |
| 235 | } |
| 236 | else if (ret > 0) |
| 237 | need_laying_out = 1; |
| 238 | |
| 239 | /* If generating a relocatable output file, then we don't |
| 240 | have to examine the relocs. */ |
| 241 | if (stub_file != NULL && !link_info.relocatable) |
| 242 | { |
| 243 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
| 244 | &link_info); |
| 245 | if (ret != 0) |
| 246 | { |
| 247 | if (ret < 0) |
| 248 | { |
| 249 | einfo ("%X%P: could not compute sections lists for stub generation: %E\n"); |
| 250 | return; |
| 251 | } |
| 252 | |
| 253 | lang_for_each_statement (build_section_lists); |
| 254 | |
| 255 | /* Call into the BFD backend to do the real work. */ |
| 256 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
| 257 | stub_file->the_bfd, |
| 258 | & link_info, |
| 259 | group_size, |
| 260 | & elf${ELFSIZE}_aarch64_add_stub_section, |
| 261 | & gldaarch64_layout_sections_again)) |
| 262 | { |
| 263 | einfo ("%X%P: cannot size stub section: %E\n"); |
| 264 | return; |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | if (need_laying_out != -1) |
| 270 | gld${EMULATION_NAME}_map_segments (need_laying_out); |
| 271 | } |
| 272 | |
| 273 | static void |
| 274 | gld${EMULATION_NAME}_finish (void) |
| 275 | { |
| 276 | if (! link_info.relocatable) |
| 277 | { |
| 278 | /* Now build the linker stubs. */ |
| 279 | if (stub_file->the_bfd->sections != NULL) |
| 280 | { |
| 281 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
| 282 | einfo ("%X%P: can not build stubs: %E\n"); |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | finish_default (); |
| 287 | } |
| 288 | |
| 289 | /* This is a convenient point to tell BFD about target specific flags. |
| 290 | After the output has been created, but before inputs are read. */ |
| 291 | static void |
| 292 | aarch64_elf_create_output_section_statements (void) |
| 293 | { |
| 294 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) |
| 295 | { |
| 296 | /* The arm backend needs special fields in the output hash structure. |
| 297 | These will only be created if the output format is an arm format, |
| 298 | hence we do not support linking and changing output formats at the |
| 299 | same time. Use a link followed by objcopy to change output formats. */ |
| 300 | einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n"); |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
| 305 | no_enum_size_warning, |
| 306 | no_wchar_size_warning, |
| 307 | pic_veneer, |
| 308 | fix_erratum_835769, fix_erratum_843419); |
| 309 | |
| 310 | stub_file = lang_add_input_file ("linker stubs", |
| 311 | lang_input_file_is_fake_enum, |
| 312 | NULL); |
| 313 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); |
| 314 | if (stub_file->the_bfd == NULL |
| 315 | || ! bfd_set_arch_mach (stub_file->the_bfd, |
| 316 | bfd_get_arch (link_info.output_bfd), |
| 317 | bfd_get_mach (link_info.output_bfd))) |
| 318 | { |
| 319 | einfo ("%X%P: can not create BFD %E\n"); |
| 320 | return; |
| 321 | } |
| 322 | |
| 323 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; |
| 324 | ldlang_add_file (stub_file); |
| 325 | } |
| 326 | |
| 327 | /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| 328 | check_needed routines. */ |
| 329 | |
| 330 | static void (*real_func) (lang_input_statement_type *); |
| 331 | |
| 332 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) |
| 333 | { |
| 334 | if (l != stub_file) |
| 335 | (*real_func) (l); |
| 336 | } |
| 337 | |
| 338 | static void |
| 339 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) |
| 340 | { |
| 341 | real_func = func; |
| 342 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); |
| 343 | } |
| 344 | |
| 345 | #define lang_for_each_input_file aarch64_lang_for_each_input_file |
| 346 | |
| 347 | EOF |
| 348 | |
| 349 | # Define some shell vars to insert bits of code into the standard elf |
| 350 | # parse_args and list_options functions. |
| 351 | # |
| 352 | PARSE_AND_LIST_PROLOGUE=' |
| 353 | #define OPTION_NO_ENUM_SIZE_WARNING 309 |
| 354 | #define OPTION_PIC_VENEER 310 |
| 355 | #define OPTION_STUBGROUP_SIZE 311 |
| 356 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 |
| 357 | #define OPTION_FIX_ERRATUM_835769 313 |
| 358 | #define OPTION_FIX_ERRATUM_843419 314 |
| 359 | ' |
| 360 | |
| 361 | PARSE_AND_LIST_SHORTOPTS=p |
| 362 | |
| 363 | PARSE_AND_LIST_LONGOPTS=' |
| 364 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, |
| 365 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, |
| 366 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, |
| 367 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, |
| 368 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, |
| 369 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
| 370 | { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
| 371 | ' |
| 372 | |
| 373 | PARSE_AND_LIST_OPTIONS=' |
| 374 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" |
| 375 | " enum sizes\n")); |
| 376 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" |
| 377 | " wchar_t sizes\n")); |
| 378 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); |
| 379 | fprintf (file, _("\ |
| 380 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ |
| 381 | handled by one stub section. A negative value\n\ |
| 382 | locates all stubs after their branches (with a\n\ |
| 383 | group size of -N), while a positive value allows\n\ |
| 384 | two groups of input sections, one before, and one\n\ |
| 385 | after each stub section. Values of +/-1 indicate\n\ |
| 386 | the linker should choose suitable defaults.\n" |
| 387 | )); |
| 388 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
| 389 | fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n")); |
| 390 | ' |
| 391 | |
| 392 | PARSE_AND_LIST_ARGS_CASES=' |
| 393 | case '\'p\'': |
| 394 | /* Only here for backwards compatibility. */ |
| 395 | break; |
| 396 | |
| 397 | case OPTION_NO_ENUM_SIZE_WARNING: |
| 398 | no_enum_size_warning = 1; |
| 399 | break; |
| 400 | |
| 401 | case OPTION_NO_WCHAR_SIZE_WARNING: |
| 402 | no_wchar_size_warning = 1; |
| 403 | break; |
| 404 | |
| 405 | case OPTION_PIC_VENEER: |
| 406 | pic_veneer = 1; |
| 407 | break; |
| 408 | |
| 409 | case OPTION_FIX_ERRATUM_835769: |
| 410 | fix_erratum_835769 = 1; |
| 411 | break; |
| 412 | |
| 413 | case OPTION_FIX_ERRATUM_843419: |
| 414 | fix_erratum_843419 = 1; |
| 415 | break; |
| 416 | |
| 417 | case OPTION_STUBGROUP_SIZE: |
| 418 | { |
| 419 | const char *end; |
| 420 | |
| 421 | group_size = bfd_scan_vma (optarg, &end, 0); |
| 422 | if (*end) |
| 423 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); |
| 424 | } |
| 425 | break; |
| 426 | ' |
| 427 | |
| 428 | # We have our own before_allocation etc. functions, but they call |
| 429 | # the standard routines, so give them a different name. |
| 430 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation |
| 431 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation |
| 432 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements |
| 433 | |
| 434 | # Replace the elf before_parse function with our own. |
| 435 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse |
| 436 | |
| 437 | # Call the extra arm-elf function |
| 438 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |