1# This shell script emits a C file. -*- C -*- 2# Copyright 2006, 2007, 2008 Free Software Foundation, Inc. 3# 4# This file is part of the GNU Binutils. 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 3 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., 51 Franklin Street - Fifth Floor, Boston, 19# MA 02110-1301, USA. 20# 21 22# This file is sourced from elf32.em, and defines extra spu specific 23# features. 24# 25fragment <<EOF 26#include "ldctor.h" 27#include "elf32-spu.h" 28 29/* Non-zero if no overlay processing should be done. */ 30static int no_overlays = 0; 31 32/* Non-zero if we want stubs on all calls out of overlay regions. */ 33static int non_overlay_stubs = 0; 34 35/* Whether to emit symbols for stubs. */ 36static int emit_stub_syms = 0; 37 38/* Non-zero to perform stack space analysis. */ 39static int stack_analysis = 0; 40 41/* Whether to emit symbols with stack requirements for each function. */ 42static int emit_stack_syms = 0; 43 44/* Range of valid addresses for loadable sections. */ 45static bfd_vma local_store_lo = 0; 46static bfd_vma local_store_hi = 0x3ffff; 47 48/* Control --auto-overlay feature. */ 49static int auto_overlay = 0; 50static char *auto_overlay_file = 0; 51static unsigned int auto_overlay_fixed = 0; 52static unsigned int auto_overlay_reserved = 0; 53static int extra_stack_space = 2000; 54int my_argc; 55char **my_argv; 56 57static const char ovl_mgr[] = { 58EOF 59 60if ! cat ${srcdir}/emultempl/spu_ovl.o_c >> e${EMULATION_NAME}.c 61then 62 echo >&2 "Missing ${srcdir}/emultempl/spu_ovl.o_c" 63 echo >&2 "You must build gas/as-new with --target=spu to build spu_ovl.o" 64 exit 1 65fi 66 67fragment <<EOF 68}; 69 70static const struct _ovl_stream ovl_mgr_stream = { 71 ovl_mgr, 72 ovl_mgr + sizeof (ovl_mgr) 73}; 74 75 76static int 77is_spu_target (void) 78{ 79 extern const bfd_target bfd_elf32_spu_vec; 80 81 return link_info.output_bfd->xvec == &bfd_elf32_spu_vec; 82} 83 84/* Create our note section. */ 85 86static void 87spu_after_open (void) 88{ 89 if (is_spu_target () 90 && !link_info.relocatable 91 && link_info.input_bfds != NULL 92 && !spu_elf_create_sections (&link_info, 93 stack_analysis, emit_stack_syms)) 94 einfo ("%X%P: can not create note section: %E\n"); 95 96 gld${EMULATION_NAME}_after_open (); 97} 98 99/* If O is NULL, add section S at the end of output section OUTPUT_NAME. 100 If O is not NULL, add section S at the beginning of output section O. 101 102 Really, we should be duplicating ldlang.c map_input_to_output_sections 103 logic here, ie. using the linker script to find where the section 104 goes. That's rather a lot of code, and we don't want to run 105 map_input_to_output_sections again because most sections are already 106 mapped. So cheat, and put the section in a fixed place, ignoring any 107 attempt via a linker script to put .stub, .ovtab, and built-in 108 overlay manager code somewhere else. */ 109 110static void 111spu_place_special_section (asection *s, asection *o, const char *output_name) 112{ 113 lang_output_section_statement_type *os; 114 115 os = lang_output_section_find (o != NULL ? o->name : output_name); 116 if (os == NULL) 117 gld${EMULATION_NAME}_place_orphan (s, output_name, 0); 118 else if (o != NULL && os->children.head != NULL) 119 { 120 lang_statement_list_type add; 121 122 lang_list_init (&add); 123 lang_add_section (&add, s, os); 124 *add.tail = os->children.head; 125 os->children.head = add.head; 126 } 127 else 128 lang_add_section (&os->children, s, os); 129 130 s->output_section->size += s->size; 131} 132 133/* Load built-in overlay manager, and tweak overlay section alignment. */ 134 135static void 136spu_elf_load_ovl_mgr (void) 137{ 138 lang_output_section_statement_type *os; 139 struct elf_link_hash_entry *h; 140 141 h = elf_link_hash_lookup (elf_hash_table (&link_info), 142 "__ovly_load", FALSE, FALSE, FALSE); 143 144 if (h != NULL 145 && (h->root.type == bfd_link_hash_defined 146 || h->root.type == bfd_link_hash_defweak) 147 && h->def_regular) 148 { 149 /* User supplied __ovly_load. */ 150 } 151 else if (ovl_mgr_stream.start == ovl_mgr_stream.end) 152 einfo ("%F%P: no built-in overlay manager\n"); 153 else 154 { 155 lang_input_statement_type *ovl_is; 156 157 ovl_is = lang_add_input_file ("builtin ovl_mgr", 158 lang_input_file_is_file_enum, 159 NULL); 160 161 if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream)) 162 einfo ("%X%P: can not open built-in overlay manager: %E\n"); 163 else 164 { 165 asection *in; 166 167 if (!load_symbols (ovl_is, NULL)) 168 einfo ("%X%P: can not load built-in overlay manager: %E\n"); 169 170 /* Map overlay manager sections to output sections. */ 171 for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next) 172 if ((in->flags & (SEC_ALLOC | SEC_LOAD)) 173 == (SEC_ALLOC | SEC_LOAD)) 174 spu_place_special_section (in, NULL, ".text"); 175 } 176 } 177 178 /* Ensure alignment of overlay sections is sufficient. */ 179 for (os = &lang_output_section_statement.head->output_section_statement; 180 os != NULL; 181 os = os->next) 182 if (os->bfd_section != NULL 183 && spu_elf_section_data (os->bfd_section) != NULL 184 && spu_elf_section_data (os->bfd_section)->u.o.ovl_index != 0) 185 { 186 if (os->bfd_section->alignment_power < 4) 187 os->bfd_section->alignment_power = 4; 188 189 /* Also ensure size rounds up. */ 190 os->block_value = 16; 191 } 192} 193 194/* Go find if we need to do anything special for overlays. */ 195 196static void 197spu_before_allocation (void) 198{ 199 if (is_spu_target () 200 && !link_info.relocatable 201 && !no_overlays) 202 { 203 /* Size the sections. This is premature, but we need to know the 204 rough layout so that overlays can be found. */ 205 expld.phase = lang_mark_phase_enum; 206 expld.dataseg.phase = exp_dataseg_none; 207 one_lang_size_sections_pass (NULL, TRUE); 208 209 /* Find overlays by inspecting section vmas. */ 210 if (spu_elf_find_overlays (&link_info)) 211 { 212 int ret; 213 214 if (auto_overlay != 0) 215 { 216 einfo ("%P: --auto-overlay ignored with user overlay script\n"); 217 auto_overlay = 0; 218 } 219 220 ret = spu_elf_size_stubs (&link_info, 221 spu_place_special_section, 222 non_overlay_stubs); 223 if (ret == 0) 224 einfo ("%X%P: can not size overlay stubs: %E\n"); 225 else if (ret == 2) 226 spu_elf_load_ovl_mgr (); 227 } 228 229 /* We must not cache anything from the preliminary sizing. */ 230 lang_reset_memory_regions (); 231 } 232 233 gld${EMULATION_NAME}_before_allocation (); 234} 235 236struct tflist { 237 struct tflist *next; 238 char name[9]; 239}; 240 241static struct tflist *tmp_file_list; 242 243static void clean_tmp (void) 244{ 245 for (; tmp_file_list != NULL; tmp_file_list = tmp_file_list->next) 246 unlink (tmp_file_list->name); 247} 248 249static int 250new_tmp_file (char **fname) 251{ 252 struct tflist *tf; 253 int fd; 254 255 if (tmp_file_list == NULL) 256 atexit (clean_tmp); 257 tf = xmalloc (sizeof (*tf)); 258 tf->next = tmp_file_list; 259 tmp_file_list = tf; 260 memcpy (tf->name, "ldXXXXXX", sizeof (tf->name)); 261 *fname = tf->name; 262#ifdef HAVE_MKSTEMP 263 fd = mkstemp (*fname); 264#else 265 *fname = mktemp (*fname); 266 if (*fname == NULL) 267 return -1; 268 fd = open (fname, O_RDWR | O_CREAT | O_EXCL, 0600); 269#endif 270 return fd; 271} 272 273static FILE * 274spu_elf_open_overlay_script (void) 275{ 276 FILE *script = NULL; 277 278 if (auto_overlay_file == NULL) 279 { 280 int fd = new_tmp_file (&auto_overlay_file); 281 if (fd == -1) 282 goto file_err; 283 script = fdopen (fd, "w"); 284 } 285 else 286 script = fopen (auto_overlay_file, "w"); 287 288 if (script == NULL) 289 { 290 file_err: 291 einfo ("%F%P: can not open script: %E\n"); 292 } 293 return script; 294} 295 296static void 297spu_elf_relink (void) 298{ 299 char **argv = xmalloc ((my_argc + 4) * sizeof (*argv)); 300 301 memcpy (argv, my_argv, my_argc * sizeof (*argv)); 302 argv[my_argc++] = "--no-auto-overlay"; 303 if (tmp_file_list->name == auto_overlay_file) 304 argv[my_argc - 1] = concat (argv[my_argc - 1], "=", 305 auto_overlay_file, (const char *) NULL); 306 argv[my_argc++] = "-T"; 307 argv[my_argc++] = auto_overlay_file; 308 argv[my_argc] = 0; 309 execvp (argv[0], (char *const *) argv); 310 perror (argv[0]); 311 _exit (127); 312} 313 314/* Final emulation specific call. */ 315 316static void 317gld${EMULATION_NAME}_finish (void) 318{ 319 int need_laying_out; 320 321 need_laying_out = bfd_elf_discard_info (link_info.output_bfd, &link_info); 322 323 gld${EMULATION_NAME}_map_segments (need_laying_out); 324 325 if (is_spu_target ()) 326 { 327 if (local_store_lo < local_store_hi) 328 { 329 asection *s; 330 331 s = spu_elf_check_vma (&link_info, auto_overlay, 332 local_store_lo, local_store_hi, 333 auto_overlay_fixed, auto_overlay_reserved, 334 extra_stack_space, 335 spu_elf_load_ovl_mgr, 336 spu_elf_open_overlay_script, 337 spu_elf_relink); 338 if (s != NULL && !auto_overlay) 339 einfo ("%X%P: %A exceeds local store range\n", s); 340 } 341 else if (auto_overlay) 342 einfo ("%P: --auto-overlay ignored with zero local store range\n"); 343 344 if (!spu_elf_build_stubs (&link_info, 345 emit_stub_syms || link_info.emitrelocations)) 346 einfo ("%F%P: can not build overlay stubs: %E\n"); 347 } 348 349 finish_default (); 350} 351 352static char * 353gld${EMULATION_NAME}_choose_target (int argc, char *argv[]) 354{ 355 my_argc = argc; 356 my_argv = argv; 357 return ldemul_default_target (argc, argv); 358} 359 360EOF 361 362if grep -q 'ld_elf.*ppc.*_emulation' ldemul-list.h; then 363 fragment <<EOF 364#include "filenames.h" 365#include <fcntl.h> 366#include <sys/wait.h> 367 368static const char * 369base_name (const char *path) 370{ 371 const char *file = strrchr (path, '/'); 372#ifdef HAVE_DOS_BASED_FILE_SYSTEM 373 { 374 char *bslash = strrchr (path, '\\\\'); 375 376 if (file == NULL || (bslash != NULL && bslash > file)) 377 file = bslash; 378 if (file == NULL 379 && path[0] != '\0' 380 && path[1] == ':') 381 file = path + 1; 382 } 383#endif 384 if (file == NULL) 385 file = path; 386 else 387 ++file; 388 return file; 389} 390 391/* This function is called when building a ppc32 or ppc64 executable 392 to handle embedded spu images. */ 393extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *); 394 395bfd_boolean 396embedded_spu_file (lang_input_statement_type *entry, const char *flags) 397{ 398 const char *cmd[6]; 399 const char *sym; 400 char *handle, *p; 401 char *oname; 402 int fd; 403 pid_t pid; 404 int status; 405 union lang_statement_union **old_stat_tail; 406 union lang_statement_union **old_file_tail; 407 union lang_statement_union *new_ent; 408 lang_input_statement_type *search; 409 410 if (entry->the_bfd->format != bfd_object 411 || strcmp (entry->the_bfd->xvec->name, "elf32-spu") != 0 412 || (entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_EXEC 413 && entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_DYN)) 414 return FALSE; 415 416 /* Use the filename as the symbol marking the program handle struct. */ 417 sym = base_name (entry->the_bfd->filename); 418 419 handle = xstrdup (sym); 420 for (p = handle; *p; ++p) 421 if (!(ISALNUM (*p) || *p == '$' || *p == '.')) 422 *p = '_'; 423 424 fd = new_tmp_file (&oname); 425 if (fd == -1) 426 return FALSE; 427 close (fd); 428 429 for (search = (lang_input_statement_type *) input_file_chain.head; 430 search != NULL; 431 search = (lang_input_statement_type *) search->next_real_file) 432 if (search->filename != NULL) 433 { 434 const char *infile = base_name (search->filename); 435 436 if (strncmp (infile, "crtbegin", 8) == 0) 437 { 438 if (infile[8] == 'S') 439 flags = concat (flags, " -fPIC", (const char *) NULL); 440 else if (infile[8] == 'T') 441 flags = concat (flags, " -fpie", (const char *) NULL); 442 break; 443 } 444 } 445 446 /* Use fork() and exec() rather than system() so that we don't 447 need to worry about quoting args. */ 448 cmd[0] = EMBEDSPU; 449 cmd[1] = flags; 450 cmd[2] = handle; 451 cmd[3] = entry->the_bfd->filename; 452 cmd[4] = oname; 453 cmd[5] = NULL; 454 if (trace_file_tries) 455 { 456 info_msg (_("running: %s \"%s\" \"%s\" \"%s\" \"%s\"\n"), 457 cmd[0], cmd[1], cmd[2], cmd[3], cmd[4]); 458 fflush (stdout); 459 } 460 461 pid = fork (); 462 if (pid == -1) 463 return FALSE; 464 if (pid == 0) 465 { 466 execvp (cmd[0], (char *const *) cmd); 467 if (strcmp ("embedspu", EMBEDSPU) != 0) 468 { 469 cmd[0] = "embedspu"; 470 execvp (cmd[0], (char *const *) cmd); 471 } 472 perror (cmd[0]); 473 _exit (127); 474 } 475#ifdef HAVE_WAITPID 476#define WAITFOR(PID, STAT) waitpid (PID, STAT, 0) 477#else 478#define WAITFOR(PID, STAT) wait (STAT) 479#endif 480 if (WAITFOR (pid, &status) != pid 481 || !WIFEXITED (status) 482 || WEXITSTATUS (status) != 0) 483 return FALSE; 484#undef WAITFOR 485 486 old_stat_tail = stat_ptr->tail; 487 old_file_tail = input_file_chain.tail; 488 if (lang_add_input_file (oname, lang_input_file_is_file_enum, NULL) == NULL) 489 return FALSE; 490 491 /* lang_add_input_file put the new list entry at the end of the statement 492 and input file lists. Move it to just after the current entry. */ 493 new_ent = *old_stat_tail; 494 *old_stat_tail = NULL; 495 stat_ptr->tail = old_stat_tail; 496 *old_file_tail = NULL; 497 input_file_chain.tail = old_file_tail; 498 new_ent->header.next = entry->header.next; 499 entry->header.next = new_ent; 500 new_ent->input_statement.next_real_file = entry->next_real_file; 501 entry->next_real_file = new_ent; 502 503 /* Ensure bfd sections are excluded from the output. */ 504 bfd_section_list_clear (entry->the_bfd); 505 entry->loaded = TRUE; 506 return TRUE; 507} 508 509EOF 510fi 511 512# Define some shell vars to insert bits of code into the standard elf 513# parse_args and list_options functions. 514# 515PARSE_AND_LIST_PROLOGUE=' 516#define OPTION_SPU_PLUGIN 301 517#define OPTION_SPU_NO_OVERLAYS (OPTION_SPU_PLUGIN + 1) 518#define OPTION_SPU_STUB_SYMS (OPTION_SPU_NO_OVERLAYS + 1) 519#define OPTION_SPU_NON_OVERLAY_STUBS (OPTION_SPU_STUB_SYMS + 1) 520#define OPTION_SPU_LOCAL_STORE (OPTION_SPU_NON_OVERLAY_STUBS + 1) 521#define OPTION_SPU_STACK_ANALYSIS (OPTION_SPU_LOCAL_STORE + 1) 522#define OPTION_SPU_STACK_SYMS (OPTION_SPU_STACK_ANALYSIS + 1) 523#define OPTION_SPU_AUTO_OVERLAY (OPTION_SPU_STACK_SYMS + 1) 524#define OPTION_SPU_AUTO_RELINK (OPTION_SPU_AUTO_OVERLAY + 1) 525#define OPTION_SPU_OVERLAY_RODATA (OPTION_SPU_AUTO_RELINK + 1) 526#define OPTION_SPU_FIXED_SPACE (OPTION_SPU_OVERLAY_RODATA + 1) 527#define OPTION_SPU_RESERVED_SPACE (OPTION_SPU_FIXED_SPACE + 1) 528#define OPTION_SPU_EXTRA_STACK (OPTION_SPU_RESERVED_SPACE + 1) 529#define OPTION_SPU_NO_AUTO_OVERLAY (OPTION_SPU_EXTRA_STACK + 1) 530' 531 532PARSE_AND_LIST_LONGOPTS=' 533 { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN }, 534 { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS }, 535 { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS }, 536 { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS }, 537 { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE }, 538 { "stack-analysis", no_argument, NULL, OPTION_SPU_STACK_ANALYSIS }, 539 { "emit-stack-syms", no_argument, NULL, OPTION_SPU_STACK_SYMS }, 540 { "auto-overlay", optional_argument, NULL, OPTION_SPU_AUTO_OVERLAY }, 541 { "auto-relink", no_argument, NULL, OPTION_SPU_AUTO_RELINK }, 542 { "overlay-rodata", no_argument, NULL, OPTION_SPU_OVERLAY_RODATA }, 543 { "fixed-space", required_argument, NULL, OPTION_SPU_FIXED_SPACE }, 544 { "reserved-space", required_argument, NULL, OPTION_SPU_RESERVED_SPACE }, 545 { "extra-stack-space", required_argument, NULL, OPTION_SPU_EXTRA_STACK }, 546 { "no-auto-overlay", optional_argument, NULL, OPTION_SPU_NO_AUTO_OVERLAY }, 547' 548 549PARSE_AND_LIST_OPTIONS=' 550 fprintf (file, _("\ 551 --plugin Make SPU plugin.\n\ 552 --no-overlays No overlay handling.\n\ 553 --emit-stub-syms Add symbols on overlay call stubs.\n\ 554 --extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\ 555 --local-store=lo:hi Valid address range.\n\ 556 --stack-analysis Estimate maximum stack requirement.\n\ 557 --emit-stack-syms Add sym giving stack needed for each func.\n\ 558 --auto-overlay [=filename] Create an overlay script in filename if\n\ 559 executable does not fit in local store.\n\ 560 --auto-relink Rerun linker using auto-overlay script.\n\ 561 --overlay-rodata Place read-only data with associated function\n\ 562 code in overlays.\n\ 563 --fixed-space=bytes Local store for non-overlay code and data.\n\ 564 --reserved-space=bytes Local store for stack and heap. If not specified\n\ 565 ld will estimate stack size and assume no heap.\n\ 566 --extra-stack-space=bytes Space for negative sp access (default 2000) if\n\ 567 --reserved-space not given.\n" 568 )); 569' 570 571PARSE_AND_LIST_ARGS_CASES=' 572 case OPTION_SPU_PLUGIN: 573 spu_elf_plugin (1); 574 break; 575 576 case OPTION_SPU_NO_OVERLAYS: 577 no_overlays = 1; 578 break; 579 580 case OPTION_SPU_STUB_SYMS: 581 emit_stub_syms = 1; 582 break; 583 584 case OPTION_SPU_NON_OVERLAY_STUBS: 585 non_overlay_stubs = 1; 586 break; 587 588 case OPTION_SPU_LOCAL_STORE: 589 { 590 char *end; 591 local_store_lo = strtoul (optarg, &end, 0); 592 if (*end == '\'':'\'') 593 { 594 local_store_hi = strtoul (end + 1, &end, 0); 595 if (*end == 0) 596 break; 597 } 598 einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg); 599 } 600 break; 601 602 case OPTION_SPU_STACK_ANALYSIS: 603 stack_analysis = 1; 604 break; 605 606 case OPTION_SPU_STACK_SYMS: 607 emit_stack_syms = 1; 608 break; 609 610 case OPTION_SPU_AUTO_OVERLAY: 611 auto_overlay |= 1; 612 if (optarg != NULL) 613 { 614 auto_overlay_file = optarg; 615 break; 616 } 617 /* Fall thru */ 618 619 case OPTION_SPU_AUTO_RELINK: 620 auto_overlay |= 2; 621 break; 622 623 case OPTION_SPU_OVERLAY_RODATA: 624 auto_overlay |= 4; 625 break; 626 627 case OPTION_SPU_FIXED_SPACE: 628 { 629 char *end; 630 auto_overlay_fixed = strtoul (optarg, &end, 0); 631 if (*end != 0) 632 einfo (_("%P%F: invalid --fixed-space value `%s'\''\n"), optarg); 633 } 634 break; 635 636 case OPTION_SPU_RESERVED_SPACE: 637 { 638 char *end; 639 auto_overlay_reserved = strtoul (optarg, &end, 0); 640 if (*end != 0) 641 einfo (_("%P%F: invalid --reserved-space value `%s'\''\n"), optarg); 642 } 643 break; 644 645 case OPTION_SPU_EXTRA_STACK: 646 { 647 char *end; 648 extra_stack_space = strtol (optarg, &end, 0); 649 if (*end != 0) 650 einfo (_("%P%F: invalid --extra-stack-space value `%s'\''\n"), optarg); 651 } 652 break; 653 654 case OPTION_SPU_NO_AUTO_OVERLAY: 655 auto_overlay = 0; 656 if (optarg != NULL) 657 { 658 struct tflist *tf; 659 size_t len; 660 661 if (tmp_file_list == NULL) 662 atexit (clean_tmp); 663 664 len = strlen (optarg) + 1; 665 tf = xmalloc (sizeof (*tf) - sizeof (tf->name) + len); 666 memcpy (tf->name, optarg, len); 667 tf->next = tmp_file_list; 668 tmp_file_list = tf; 669 break; 670 } 671 break; 672' 673 674LDEMUL_AFTER_OPEN=spu_after_open 675LDEMUL_BEFORE_ALLOCATION=spu_before_allocation 676LDEMUL_FINISH=gld${EMULATION_NAME}_finish 677LDEMUL_CHOOSE_TARGET=gld${EMULATION_NAME}_choose_target 678