ld/emultempl/spuelf.em

   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 #
  25 fragment <<EOF
  26 #include "ldctor.h"
  27 #include "elf32-spu.h"
  28
  29 /* Non-zero if no overlay processing should be done.  */
  30 static int no_overlays = 0;
  31
  32 /* Non-zero if we want stubs on all calls out of overlay regions.  */
  33 static int non_overlay_stubs = 0;
  34
  35 /* Whether to emit symbols for stubs.  */
  36 static int emit_stub_syms = 0;
  37
  38 /* Non-zero to perform stack space analysis.  */
  39 static int stack_analysis = 0;
  40
  41 /* Whether to emit symbols with stack requirements for each function.  */
  42 static int emit_stack_syms = 0;
  43
  44 /* Range of valid addresses for loadable sections.  */
  45 static bfd_vma local_store_lo = 0;
  46 static bfd_vma local_store_hi = 0x3ffff;
  47
  48 static const char ovl_mgr[] = {
  49 EOF
  50
  51 ../binutils/bin2c < ${srcdir}/emultempl/spu_ovl.o >> e${EMULATION_NAME}.c
  52
  53 fragment <<EOF
  54 };
  55
  56 static const struct _ovl_stream ovl_mgr_stream = {
  57   ovl_mgr,
  58   ovl_mgr + sizeof (ovl_mgr)
  59 };
  60
  61
  62 static int
  63 is_spu_target (void)
  64 {
  65   extern const bfd_target bfd_elf32_spu_vec;
  66
  67   return link_info.output_bfd->xvec == &bfd_elf32_spu_vec;
  68 }
  69
  70 /* Create our note section.  */
  71
  72 static void
  73 spu_after_open (void)
  74 {
  75   if (is_spu_target ()
  76       && !link_info.relocatable
  77       && link_info.input_bfds != NULL
  78       && !spu_elf_create_sections (link_info.output_bfd, &link_info,
  79                                    stack_analysis, emit_stack_syms))
  80     einfo ("%X%P: can not create note section: %E\n");
  81
  82   gld${EMULATION_NAME}_after_open ();
  83 }
  84
  85 /* If O is NULL, add section S at the end of output section OUTPUT_NAME.
  86    If O is not NULL, add section S at the beginning of output section O.
  87
  88    Really, we should be duplicating ldlang.c map_input_to_output_sections
  89    logic here, ie. using the linker script to find where the section
  90    goes.  That's rather a lot of code, and we don't want to run
  91    map_input_to_output_sections again because most sections are already
  92    mapped.  So cheat, and put the section in a fixed place, ignoring any
  93    attempt via a linker script to put .stub, .ovtab, and built-in
  94    overlay manager code somewhere else.  */
  95
  96 static void
  97 spu_place_special_section (asection *s, asection *o, const char *output_name)
  98 {
  99   lang_output_section_statement_type *os;
 100
 101   os = lang_output_section_find (o != NULL ? o->name : output_name);
 102   if (os == NULL)
 103     {
 104       const char *save = s->name;
 105       s->name = output_name;
 106       gld${EMULATION_NAME}_place_orphan (s);
 107       s->name = save;
 108     }
 109   else if (o != NULL && os->children.head != NULL)
 110     {
 111       lang_statement_list_type add;
 112
 113       lang_list_init (&add);
 114       lang_add_section (&add, s, os);
 115       *add.tail = os->children.head;
 116       os->children.head = add.head;
 117     }
 118   else
 119     lang_add_section (&os->children, s, os);
 120
 121   s->output_section->size += s->size;
 122 }
 123
 124 /* Load built-in overlay manager, and tweak overlay section alignment.  */
 125
 126 static void
 127 spu_elf_load_ovl_mgr (void)
 128 {
 129   lang_output_section_statement_type *os;
 130   struct elf_link_hash_entry *h;
 131
 132   h = elf_link_hash_lookup (elf_hash_table (&link_info),
 133                             "__ovly_load", FALSE, FALSE, FALSE);
 134
 135   if (h != NULL
 136       && (h->root.type == bfd_link_hash_defined
 137           || h->root.type == bfd_link_hash_defweak)
 138       && h->def_regular)
 139     {
 140       /* User supplied __ovly_load.  */
 141     }
 142   else if (ovl_mgr_stream.start == ovl_mgr_stream.end)
 143     einfo ("%F%P: no built-in overlay manager\n");
 144   else
 145     {
 146       lang_input_statement_type *ovl_is;
 147
 148       ovl_is = lang_add_input_file ("builtin ovl_mgr",
 149                                     lang_input_file_is_file_enum,
 150                                     NULL);
 151
 152       if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream))
 153         einfo ("%X%P: can not open built-in overlay manager: %E\n");
 154       else
 155         {
 156           asection *in;
 157
 158           if (!load_symbols (ovl_is, NULL))
 159             einfo ("%X%P: can not load built-in overlay manager: %E\n");
 160
 161           /* Map overlay manager sections to output sections.  */
 162           for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next)
 163             if ((in->flags & (SEC_ALLOC | SEC_LOAD))
 164                 == (SEC_ALLOC | SEC_LOAD))
 165               spu_place_special_section (in, NULL, ".text");
 166         }
 167     }
 168
 169   /* Ensure alignment of overlay sections is sufficient.  */
 170   for (os = &lang_output_section_statement.head->output_section_statement;
 171        os != NULL;
 172        os = os->next)
 173     if (os->bfd_section != NULL
 174         && spu_elf_section_data (os->bfd_section) != NULL
 175         && spu_elf_section_data (os->bfd_section)->u.o.ovl_index != 0)
 176       {
 177         if (os->bfd_section->alignment_power < 4)
 178           os->bfd_section->alignment_power = 4;
 179
 180         /* Also ensure size rounds up.  */
 181         os->block_value = 16;
 182       }
 183 }
 184
 185 /* Go find if we need to do anything special for overlays.  */
 186
 187 static void
 188 spu_before_allocation (void)
 189 {
 190   if (is_spu_target ()
 191       && !link_info.relocatable
 192       && !no_overlays)
 193     {
 194       /* Size the sections.  This is premature, but we need to know the
 195          rough layout so that overlays can be found.  */
 196       expld.phase = lang_mark_phase_enum;
 197       expld.dataseg.phase = exp_dataseg_none;
 198       one_lang_size_sections_pass (NULL, TRUE);
 199
 200       /* Find overlays by inspecting section vmas.  */
 201       if (spu_elf_find_overlays (link_info.output_bfd, &link_info))
 202         {
 203           int ret;
 204
 205           ret = spu_elf_size_stubs (link_info.output_bfd, &link_info,
 206                                     spu_place_special_section,
 207                                     non_overlay_stubs);
 208           if (ret == 0)
 209             einfo ("%X%P: can not size overlay stubs: %E\n");
 210           else if (ret == 2)
 211             spu_elf_load_ovl_mgr ();
 212         }
 213
 214       /* We must not cache anything from the preliminary sizing.  */
 215       lang_reset_memory_regions ();
 216     }
 217
 218   gld${EMULATION_NAME}_before_allocation ();
 219 }
 220
 221 /* Final emulation specific call.  */
 222
 223 static void
 224 gld${EMULATION_NAME}_finish (void)
 225 {
 226   int need_laying_out;
 227
 228   need_laying_out = bfd_elf_discard_info (link_info.output_bfd, &link_info);
 229
 230   gld${EMULATION_NAME}_map_segments (need_laying_out);
 231
 232   if (is_spu_target () && local_store_lo < local_store_hi)
 233     {
 234       asection *s;
 235
 236       s = spu_elf_check_vma (link_info.output_bfd,
 237                              local_store_lo, local_store_hi);
 238       if (s != NULL)
 239         einfo ("%X%P: %A exceeds local store range\n", s);
 240     }
 241
 242   if (!spu_elf_build_stubs (&link_info,
 243                             emit_stub_syms || link_info.emitrelocations))
 244     einfo ("%X%P: can not build overlay stubs: %E\n");
 245
 246   finish_default ();
 247 }
 248
 249 EOF
 250
 251 if grep -q 'ld_elf.*ppc.*_emulation' ldemul-list.h; then
 252   fragment <<EOF
 253 #include "filenames.h"
 254 #include <fcntl.h>
 255 #include <sys/wait.h>
 256
 257 struct tflist {
 258   struct tflist *next;
 259   char name[9];
 260 };
 261
 262 static struct tflist *tmp_file_list;
 263
 264 static void clean_tmp (void)
 265 {
 266   for (; tmp_file_list != NULL; tmp_file_list = tmp_file_list->next)
 267     unlink (tmp_file_list->name);
 268 }
 269
 270 static const char *
 271 base_name (const char *path)
 272 {
 273   const char *file = strrchr (path, '/');
 274 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 275   {
 276     char *bslash = strrchr (path, '\\\\');
 277
 278     if (file == NULL || (bslash != NULL && bslash > file))
 279       file = bslash;
 280     if (file == NULL
 281         && path[0] != '\0'
 282         && path[1] == ':')
 283       file = path + 1;
 284   }
 285 #endif
 286   if (file == NULL)
 287     file = path;
 288   else
 289     ++file;
 290   return file;
 291 }
 292
 293 /* This function is called when building a ppc32 or ppc64 executable
 294    to handle embedded spu images.  */
 295 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 296
 297 bfd_boolean
 298 embedded_spu_file (lang_input_statement_type *entry, const char *flags)
 299 {
 300   const char *cmd[6];
 301   const char *sym;
 302   char *handle, *p;
 303   struct tflist *tf;
 304   char *oname;
 305   int fd;
 306   pid_t pid;
 307   int status;
 308   union lang_statement_union **old_stat_tail;
 309   union lang_statement_union **old_file_tail;
 310   union lang_statement_union *new_ent;
 311   lang_input_statement_type *search;
 312
 313   if (entry->the_bfd->format != bfd_object
 314       || strcmp (entry->the_bfd->xvec->name, "elf32-spu") != 0
 315       || (entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_EXEC
 316           && entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_DYN))
 317     return FALSE;
 318
 319   /* Use the filename as the symbol marking the program handle struct.  */
 320   sym = base_name (entry->the_bfd->filename);
 321
 322   handle = xstrdup (sym);
 323   for (p = handle; *p; ++p)
 324     if (!(ISALNUM (*p) || *p == '$' || *p == '.'))
 325       *p = '_';
 326
 327   if (tmp_file_list == NULL)
 328     atexit (clean_tmp);
 329   tf = xmalloc (sizeof (*tf));
 330   tf->next = tmp_file_list;
 331   tmp_file_list = tf;
 332   oname = tf->name;
 333   memcpy (tf->name, "ldXXXXXX", sizeof (tf->name));
 334
 335 #ifdef HAVE_MKSTEMP
 336   fd = mkstemp (oname);
 337 #else
 338   oname = mktemp (oname);
 339   if (oname == NULL)
 340     return FALSE;
 341   fd = open (oname, O_RDWR | O_CREAT | O_EXCL, 0600);
 342 #endif
 343   if (fd == -1)
 344     return FALSE;
 345   close (fd);
 346
 347   for (search = (lang_input_statement_type *) input_file_chain.head;
 348        search != NULL;
 349        search = (lang_input_statement_type *) search->next_real_file)
 350     if (search->filename != NULL)
 351       {
 352         const char *infile = base_name (search->filename);
 353
 354         if (strncmp (infile, "crtbegin", 8) == 0)
 355           {
 356             if (infile[8] == 'S')
 357               flags = concat (flags, " -fPIC", (const char *) NULL);
 358             else if (infile[8] == 'T')
 359               flags = concat (flags, " -fpie", (const char *) NULL);
 360             break;
 361           }
 362       }
 363
 364   /* Use fork() and exec() rather than system() so that we don't
 365      need to worry about quoting args.  */
 366   cmd[0] = EMBEDSPU;
 367   cmd[1] = flags;
 368   cmd[2] = handle;
 369   cmd[3] = entry->the_bfd->filename;
 370   cmd[4] = oname;
 371   cmd[5] = NULL;
 372   if (trace_file_tries)
 373     {
 374       info_msg (_("running: %s \"%s\" \"%s\" \"%s\" \"%s\"\n"),
 375                 cmd[0], cmd[1], cmd[2], cmd[3], cmd[4]);
 376       fflush (stdout);
 377     }
 378
 379   pid = fork ();
 380   if (pid == -1)
 381     return FALSE;
 382   if (pid == 0)
 383     {
 384       execvp (cmd[0], (char *const *) cmd);
 385       if (strcmp ("embedspu", EMBEDSPU) != 0)
 386         {
 387           cmd[0] = "embedspu";
 388           execvp (cmd[0], (char *const *) cmd);
 389         }
 390       perror (cmd[0]);
 391       _exit (127);
 392     }
 393 #ifdef HAVE_WAITPID
 394 #define WAITFOR(PID, STAT) waitpid (PID, STAT, 0)
 395 #else
 396 #define WAITFOR(PID, STAT) wait (STAT)
 397 #endif
 398   if (WAITFOR (pid, &status) != pid
 399       || !WIFEXITED (status)
 400       || WEXITSTATUS (status) != 0)
 401     return FALSE;
 402 #undef WAITFOR
 403
 404   old_stat_tail = stat_ptr->tail;
 405   old_file_tail = input_file_chain.tail;
 406   if (lang_add_input_file (oname, lang_input_file_is_file_enum, NULL) == NULL)
 407     return FALSE;
 408
 409   /* lang_add_input_file put the new list entry at the end of the statement
 410      and input file lists.  Move it to just after the current entry.  */
 411   new_ent = *old_stat_tail;
 412   *old_stat_tail = NULL;
 413   stat_ptr->tail = old_stat_tail;
 414   *old_file_tail = NULL;
 415   input_file_chain.tail = old_file_tail;
 416   new_ent->header.next = entry->header.next;
 417   entry->header.next = new_ent;
 418   new_ent->input_statement.next_real_file = entry->next_real_file;
 419   entry->next_real_file = new_ent;
 420
 421   /* Ensure bfd sections are excluded from the output.  */
 422   bfd_section_list_clear (entry->the_bfd);
 423   entry->loaded = TRUE;
 424   return TRUE;
 425 }
 426
 427 EOF
 428 fi
 429
 430 # Define some shell vars to insert bits of code into the standard elf
 431 # parse_args and list_options functions.
 432 #
 433 PARSE_AND_LIST_PROLOGUE='
 434 #define OPTION_SPU_PLUGIN               301
 435 #define OPTION_SPU_NO_OVERLAYS          (OPTION_SPU_PLUGIN + 1)
 436 #define OPTION_SPU_STUB_SYMS            (OPTION_SPU_NO_OVERLAYS + 1)
 437 #define OPTION_SPU_NON_OVERLAY_STUBS    (OPTION_SPU_STUB_SYMS + 1)
 438 #define OPTION_SPU_LOCAL_STORE          (OPTION_SPU_NON_OVERLAY_STUBS + 1)
 439 #define OPTION_SPU_STACK_ANALYSIS       (OPTION_SPU_LOCAL_STORE + 1)
 440 #define OPTION_SPU_STACK_SYMS           (OPTION_SPU_STACK_ANALYSIS + 1)
 441 '
 442
 443 PARSE_AND_LIST_LONGOPTS='
 444   { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN },
 445   { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS },
 446   { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS },
 447   { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS },
 448   { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE },
 449   { "stack-analysis", no_argument, NULL, OPTION_SPU_STACK_ANALYSIS },
 450   { "emit-stack-syms", no_argument, NULL, OPTION_SPU_STACK_SYMS },
 451 '
 452
 453 PARSE_AND_LIST_OPTIONS='
 454   fprintf (file, _("\
 455   --plugin                    Make SPU plugin.\n\
 456   --no-overlays               No overlay handling.\n\
 457   --emit-stub-syms            Add symbols on overlay call stubs.\n\
 458   --extra-overlay-stubs       Add stubs on all calls out of overlay regions.\n\
 459   --local-store=lo:hi         Valid address range.\n\
 460   --stack-analysis            Estimate maximum stack requirement.\n\
 461   --emit-stack-syms           Add sym giving stack needed for each func.\n"
 462                    ));
 463 '
 464
 465 PARSE_AND_LIST_ARGS_CASES='
 466     case OPTION_SPU_PLUGIN:
 467       spu_elf_plugin (1);
 468       break;
 469
 470     case OPTION_SPU_NO_OVERLAYS:
 471       no_overlays = 1;
 472       break;
 473
 474     case OPTION_SPU_STUB_SYMS:
 475       emit_stub_syms = 1;
 476       break;
 477
 478     case OPTION_SPU_NON_OVERLAY_STUBS:
 479       non_overlay_stubs = 1;
 480       break;
 481
 482     case OPTION_SPU_LOCAL_STORE:
 483       {
 484         char *end;
 485         local_store_lo = strtoul (optarg, &end, 0);
 486         if (*end == '\'':'\'')
 487           {
 488             local_store_hi = strtoul (end + 1, &end, 0);
 489             if (*end == 0)
 490               break;
 491           }
 492         einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg);
 493       }
 494       break;
 495
 496     case OPTION_SPU_STACK_ANALYSIS:
 497       stack_analysis = 1;
 498       break;
 499
 500     case OPTION_SPU_STACK_SYMS:
 501       emit_stack_syms = 1;
 502       break;
 503 '
 504
 505 LDEMUL_AFTER_OPEN=spu_after_open
 506 LDEMUL_BEFORE_ALLOCATION=spu_before_allocation
 507 LDEMUL_FINISH=gld${EMULATION_NAME}_finish