| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright 2002 Free Software Foundation, Inc. |
| 3 | # |
| 4 | # This file is part of GLD, the Gnu Linker. |
| 5 | # |
| 6 | # This program is free software; you can redistribute it and/or modify |
| 7 | # it under the terms of the GNU General Public License as published by |
| 8 | # the Free Software Foundation; either version 2 of the License, or |
| 9 | # (at your option) any later version. |
| 10 | # |
| 11 | # This program is distributed in the hope that it will be useful, |
| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | # GNU General Public License for more details. |
| 15 | # |
| 16 | # You should have received a copy of the GNU General Public License |
| 17 | # along with this program; if not, write to the Free Software |
| 18 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | # |
| 20 | |
| 21 | # This file is sourced from elf32.em, and defines extra powerpc64-elf |
| 22 | # specific routines. |
| 23 | # |
| 24 | cat >>e${EMULATION_NAME}.c <<EOF |
| 25 | |
| 26 | #include "ldctor.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "elf64-ppc.h" |
| 29 | |
| 30 | /* Fake input file for stubs. */ |
| 31 | static lang_input_statement_type *stub_file; |
| 32 | |
| 33 | /* Whether we need to call ppc_layout_sections_again. */ |
| 34 | static int need_laying_out = 0; |
| 35 | |
| 36 | /* Maximum size of a group of input sections that can be handled by |
| 37 | one stub section. A value of +/-1 indicates the bfd back-end |
| 38 | should use a suitable default size. */ |
| 39 | static bfd_signed_vma group_size = 1; |
| 40 | |
| 41 | /* Whether to add ".foo" entries for each "foo" in a version script. */ |
| 42 | static int dotsyms = 1; |
| 43 | |
| 44 | static void ppc_create_output_section_statements PARAMS ((void)); |
| 45 | static asection *ppc_add_stub_section PARAMS ((const char *, asection *)); |
| 46 | static void ppc_layout_sections_again PARAMS ((void)); |
| 47 | static void gld${EMULATION_NAME}_after_allocation PARAMS ((void)); |
| 48 | static void build_section_lists PARAMS ((lang_statement_union_type *)); |
| 49 | static struct bfd_elf_version_expr *gld${EMULATION_NAME}_new_vers_pattern |
| 50 | PARAMS ((struct bfd_elf_version_expr *)); |
| 51 | |
| 52 | /* This is called before the input files are opened. We create a new |
| 53 | fake input file to hold the stub sections. */ |
| 54 | |
| 55 | static void |
| 56 | ppc_create_output_section_statements () |
| 57 | { |
| 58 | stub_file = lang_add_input_file ("linker stubs", |
| 59 | lang_input_file_is_fake_enum, |
| 60 | NULL); |
| 61 | stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); |
| 62 | if (stub_file->the_bfd == NULL |
| 63 | || !bfd_set_arch_mach (stub_file->the_bfd, |
| 64 | bfd_get_arch (output_bfd), |
| 65 | bfd_get_mach (output_bfd))) |
| 66 | { |
| 67 | einfo ("%X%P: can not create BFD %E\n"); |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | ldlang_add_file (stub_file); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | struct hook_stub_info |
| 76 | { |
| 77 | lang_statement_list_type add; |
| 78 | asection *input_section; |
| 79 | }; |
| 80 | |
| 81 | /* Traverse the linker tree to find the spot where the stub goes. */ |
| 82 | |
| 83 | static boolean hook_in_stub |
| 84 | PARAMS ((struct hook_stub_info *, lang_statement_union_type **)); |
| 85 | |
| 86 | static boolean |
| 87 | hook_in_stub (info, lp) |
| 88 | struct hook_stub_info *info; |
| 89 | lang_statement_union_type **lp; |
| 90 | { |
| 91 | lang_statement_union_type *l; |
| 92 | boolean ret; |
| 93 | |
| 94 | for (; (l = *lp) != NULL; lp = &l->header.next) |
| 95 | { |
| 96 | switch (l->header.type) |
| 97 | { |
| 98 | case lang_constructors_statement_enum: |
| 99 | ret = hook_in_stub (info, &constructor_list.head); |
| 100 | if (ret) |
| 101 | return ret; |
| 102 | break; |
| 103 | |
| 104 | case lang_output_section_statement_enum: |
| 105 | ret = hook_in_stub (info, |
| 106 | &l->output_section_statement.children.head); |
| 107 | if (ret) |
| 108 | return ret; |
| 109 | break; |
| 110 | |
| 111 | case lang_wild_statement_enum: |
| 112 | ret = hook_in_stub (info, &l->wild_statement.children.head); |
| 113 | if (ret) |
| 114 | return ret; |
| 115 | break; |
| 116 | |
| 117 | case lang_group_statement_enum: |
| 118 | ret = hook_in_stub (info, &l->group_statement.children.head); |
| 119 | if (ret) |
| 120 | return ret; |
| 121 | break; |
| 122 | |
| 123 | case lang_input_section_enum: |
| 124 | if (l->input_section.section == info->input_section) |
| 125 | { |
| 126 | /* We've found our section. Insert the stub immediately |
| 127 | before its associated input section. */ |
| 128 | *lp = info->add.head; |
| 129 | *(info->add.tail) = l; |
| 130 | return true; |
| 131 | } |
| 132 | break; |
| 133 | |
| 134 | case lang_data_statement_enum: |
| 135 | case lang_reloc_statement_enum: |
| 136 | case lang_object_symbols_statement_enum: |
| 137 | case lang_output_statement_enum: |
| 138 | case lang_target_statement_enum: |
| 139 | case lang_input_statement_enum: |
| 140 | case lang_assignment_statement_enum: |
| 141 | case lang_padding_statement_enum: |
| 142 | case lang_address_statement_enum: |
| 143 | case lang_fill_statement_enum: |
| 144 | break; |
| 145 | |
| 146 | default: |
| 147 | FAIL (); |
| 148 | break; |
| 149 | } |
| 150 | } |
| 151 | return false; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | /* Call-back for ppc64_elf_size_stubs. */ |
| 156 | |
| 157 | /* Create a new stub section, and arrange for it to be linked |
| 158 | immediately before INPUT_SECTION. */ |
| 159 | |
| 160 | static asection * |
| 161 | ppc_add_stub_section (stub_sec_name, input_section) |
| 162 | const char *stub_sec_name; |
| 163 | asection *input_section; |
| 164 | { |
| 165 | asection *stub_sec; |
| 166 | flagword flags; |
| 167 | asection *output_section; |
| 168 | const char *secname; |
| 169 | lang_output_section_statement_type *os; |
| 170 | struct hook_stub_info info; |
| 171 | |
| 172 | stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name); |
| 173 | if (stub_sec == NULL) |
| 174 | goto err_ret; |
| 175 | |
| 176 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| 177 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); |
| 178 | if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags)) |
| 179 | goto err_ret; |
| 180 | |
| 181 | output_section = input_section->output_section; |
| 182 | secname = bfd_get_section_name (output_section->owner, output_section); |
| 183 | os = lang_output_section_find (secname); |
| 184 | |
| 185 | info.input_section = input_section; |
| 186 | lang_list_init (&info.add); |
| 187 | lang_add_section (&info.add, stub_sec, os, stub_file); |
| 188 | |
| 189 | if (info.add.head == NULL) |
| 190 | goto err_ret; |
| 191 | |
| 192 | if (hook_in_stub (&info, &os->children.head)) |
| 193 | return stub_sec; |
| 194 | |
| 195 | err_ret: |
| 196 | einfo ("%X%P: can not make stub section: %E\n"); |
| 197 | return NULL; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | /* Another call-back for ppc64_elf_size_stubs. */ |
| 202 | |
| 203 | static void |
| 204 | ppc_layout_sections_again () |
| 205 | { |
| 206 | /* If we have changed sizes of the stub sections, then we need |
| 207 | to recalculate all the section offsets. This may mean we need to |
| 208 | add even more stubs. */ |
| 209 | need_laying_out = 0; |
| 210 | |
| 211 | lang_reset_memory_regions (); |
| 212 | |
| 213 | /* Resize the sections. */ |
| 214 | lang_size_sections (stat_ptr->head, abs_output_section, |
| 215 | &stat_ptr->head, 0, (bfd_vma) 0, NULL); |
| 216 | |
| 217 | /* Recalculate TOC base. */ |
| 218 | ldemul_after_allocation (); |
| 219 | |
| 220 | /* Do the assignments again. */ |
| 221 | lang_do_assignments (stat_ptr->head, abs_output_section, |
| 222 | (fill_type *) 0, (bfd_vma) 0); |
| 223 | } |
| 224 | |
| 225 | |
| 226 | /* Call the back-end function to set TOC base after we have placed all |
| 227 | the sections. */ |
| 228 | static void |
| 229 | gld${EMULATION_NAME}_after_allocation () |
| 230 | { |
| 231 | if (!link_info.relocateable) |
| 232 | _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd)); |
| 233 | } |
| 234 | |
| 235 | |
| 236 | static void |
| 237 | build_section_lists (statement) |
| 238 | lang_statement_union_type *statement; |
| 239 | { |
| 240 | if (statement->header.type == lang_input_section_enum |
| 241 | && !statement->input_section.ifile->just_syms_flag |
| 242 | && statement->input_section.section->output_section != NULL |
| 243 | && statement->input_section.section->output_section->owner == output_bfd) |
| 244 | { |
| 245 | ppc64_elf_next_input_section (&link_info, |
| 246 | statement->input_section.section); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | |
| 251 | /* Final emulation specific call. */ |
| 252 | |
| 253 | static void |
| 254 | gld${EMULATION_NAME}_finish () |
| 255 | { |
| 256 | int ret; |
| 257 | |
| 258 | /* e_entry on PowerPC64 points to the function descriptor for |
| 259 | _start. If _start is missing, default to the first function |
| 260 | descriptor in the .opd section. */ |
| 261 | entry_section = ".opd"; |
| 262 | |
| 263 | /* If generating a relocatable output file, then we don't have any |
| 264 | stubs. */ |
| 265 | if (link_info.relocateable) |
| 266 | return; |
| 267 | |
| 268 | /* bfd_elf64_discard_info just plays with debugging sections, |
| 269 | ie. doesn't affect any code, so we can delay resizing the |
| 270 | sections. It's likely we'll resize everything in the process of |
| 271 | adding stubs. */ |
| 272 | if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info)) |
| 273 | need_laying_out = 1; |
| 274 | |
| 275 | ret = ppc64_elf_setup_section_lists (output_bfd, &link_info); |
| 276 | if (ret != 0) |
| 277 | { |
| 278 | if (ret < 0) |
| 279 | { |
| 280 | einfo ("%X%P: can not size stub section: %E\n"); |
| 281 | return; |
| 282 | } |
| 283 | |
| 284 | lang_for_each_statement (build_section_lists); |
| 285 | |
| 286 | /* Call into the BFD backend to do the real work. */ |
| 287 | if (!ppc64_elf_size_stubs (output_bfd, |
| 288 | stub_file->the_bfd, |
| 289 | &link_info, |
| 290 | group_size, |
| 291 | &ppc_add_stub_section, |
| 292 | &ppc_layout_sections_again)) |
| 293 | { |
| 294 | einfo ("%X%P: can not size stub section: %E\n"); |
| 295 | return; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | if (need_laying_out) |
| 300 | ppc_layout_sections_again (); |
| 301 | |
| 302 | if (stub_file->the_bfd->sections != NULL) |
| 303 | { |
| 304 | if (!ppc64_elf_build_stubs (&link_info)) |
| 305 | einfo ("%X%P: can not build stubs: %E\n"); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | |
| 310 | /* Add a pattern matching ".foo" for every "foo" in a version script. |
| 311 | |
| 312 | The reason for doing this is that many shared library version |
| 313 | scripts export a selected set of functions or data symbols, forcing |
| 314 | others local. eg. |
| 315 | |
| 316 | . VERS_1 { |
| 317 | . global: |
| 318 | . this; that; some; thing; |
| 319 | . local: |
| 320 | . *; |
| 321 | . }; |
| 322 | |
| 323 | To make the above work for PowerPC64, we need to export ".this", |
| 324 | ".that" and so on, otherwise only the function descriptor syms are |
| 325 | exported. Lack of an exported function code sym may cause a |
| 326 | definition to be pulled in from a static library. */ |
| 327 | |
| 328 | struct bfd_elf_version_expr * |
| 329 | gld${EMULATION_NAME}_new_vers_pattern (entry) |
| 330 | struct bfd_elf_version_expr *entry; |
| 331 | { |
| 332 | struct bfd_elf_version_expr *dot_entry; |
| 333 | struct bfd_elf_version_expr *next; |
| 334 | unsigned int len; |
| 335 | char *dot_pat; |
| 336 | |
| 337 | if (!dotsyms || entry->pattern[0] == '*') |
| 338 | return entry; |
| 339 | |
| 340 | /* Is the script adding ".foo" explicitly? */ |
| 341 | if (entry->pattern[0] == '.') |
| 342 | { |
| 343 | /* We may have added this pattern automatically. Don't add it |
| 344 | again. Quadratic behaviour here is acceptable as the list |
| 345 | may be traversed for each input bfd symbol. */ |
| 346 | for (next = entry->next; next != NULL; next = next->next) |
| 347 | { |
| 348 | if (strcmp (next->pattern, entry->pattern) == 0 |
| 349 | && next->match == entry->match) |
| 350 | { |
| 351 | next = entry->next; |
| 352 | free (entry->pattern); |
| 353 | free (entry); |
| 354 | return next; |
| 355 | } |
| 356 | } |
| 357 | return entry; |
| 358 | } |
| 359 | |
| 360 | /* Don't add ".foo" if the script has already done so. */ |
| 361 | for (next = entry->next; next != NULL; next = next->next) |
| 362 | { |
| 363 | if (next->pattern[0] == '.' |
| 364 | && strcmp (next->pattern + 1, entry->pattern) == 0 |
| 365 | && next->match == entry->match) |
| 366 | return entry; |
| 367 | } |
| 368 | |
| 369 | dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry); |
| 370 | dot_entry->next = entry; |
| 371 | len = strlen (entry->pattern) + 2; |
| 372 | dot_pat = xmalloc (len); |
| 373 | dot_pat[0] = '.'; |
| 374 | memcpy (dot_pat + 1, entry->pattern, len - 1); |
| 375 | dot_entry->pattern = dot_pat; |
| 376 | dot_entry->match = entry->match; |
| 377 | return dot_entry; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| 382 | check_needed routines. */ |
| 383 | |
| 384 | static void ppc_for_each_input_file_wrapper |
| 385 | PARAMS ((lang_input_statement_type *)); |
| 386 | static void ppc_lang_for_each_input_file |
| 387 | PARAMS ((void (*) (lang_input_statement_type *))); |
| 388 | |
| 389 | static void (*real_func) PARAMS ((lang_input_statement_type *)); |
| 390 | |
| 391 | static void ppc_for_each_input_file_wrapper (l) |
| 392 | lang_input_statement_type *l; |
| 393 | { |
| 394 | if (l != stub_file) |
| 395 | (*real_func) (l); |
| 396 | } |
| 397 | |
| 398 | static void |
| 399 | ppc_lang_for_each_input_file (func) |
| 400 | void (*func) PARAMS ((lang_input_statement_type *)); |
| 401 | { |
| 402 | real_func = func; |
| 403 | lang_for_each_input_file (&ppc_for_each_input_file_wrapper); |
| 404 | } |
| 405 | |
| 406 | #define lang_for_each_input_file ppc_lang_for_each_input_file |
| 407 | |
| 408 | EOF |
| 409 | |
| 410 | # Define some shell vars to insert bits of code into the standard elf |
| 411 | # parse_args and list_options functions. |
| 412 | # |
| 413 | PARSE_AND_LIST_PROLOGUE=' |
| 414 | #define OPTION_STUBGROUP_SIZE 301 |
| 415 | #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1) |
| 416 | #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1) |
| 417 | ' |
| 418 | |
| 419 | # The options are repeated below so that no abbreviations are allowed. |
| 420 | # Otherwise -s matches stub-group-size |
| 421 | PARSE_AND_LIST_LONGOPTS=' |
| 422 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, |
| 423 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, |
| 424 | { "dotsyms", no_argument, NULL, OPTION_DOTSYMS }, |
| 425 | { "dotsyms", no_argument, NULL, OPTION_DOTSYMS }, |
| 426 | { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS }, |
| 427 | { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS }, |
| 428 | ' |
| 429 | |
| 430 | PARSE_AND_LIST_OPTIONS=' |
| 431 | fprintf (file, _("\ |
| 432 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ |
| 433 | handled by one stub section. A negative value\n\ |
| 434 | locates all stubs before their branches (with a\n\ |
| 435 | group size of -N), while a positive value allows\n\ |
| 436 | two groups of input sections, one before, and one\n\ |
| 437 | after each stub section. Values of +/-1 indicate\n\ |
| 438 | the linker should choose suitable defaults.\n" |
| 439 | )); |
| 440 | fprintf (file, _("\ |
| 441 | --dotsyms For every version pattern \"foo\" in a version script,\n\ |
| 442 | add \".foo\" so that function code symbols are\n\ |
| 443 | treated the same as function descriptor symbols.\n\ |
| 444 | Defaults to on.\n" |
| 445 | )); |
| 446 | fprintf (file, _("\ |
| 447 | --no-dotsyms Don'\''t do anything special in version scripts.\n" |
| 448 | )); |
| 449 | ' |
| 450 | |
| 451 | PARSE_AND_LIST_ARGS_CASES=' |
| 452 | case OPTION_STUBGROUP_SIZE: |
| 453 | { |
| 454 | const char *end; |
| 455 | group_size = bfd_scan_vma (optarg, &end, 0); |
| 456 | if (*end) |
| 457 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); |
| 458 | } |
| 459 | break; |
| 460 | |
| 461 | case OPTION_DOTSYMS: |
| 462 | { |
| 463 | dotsyms = 1; |
| 464 | } |
| 465 | break; |
| 466 | |
| 467 | case OPTION_NO_DOTSYMS: |
| 468 | { |
| 469 | dotsyms = 0; |
| 470 | } |
| 471 | break; |
| 472 | ' |
| 473 | |
| 474 | # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation |
| 475 | # |
| 476 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation |
| 477 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |
| 478 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements |
| 479 | LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern |