ld/emultempl/spuelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2006, 2007 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 cat >>e${EMULATION_NAME}.c <<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 cat >>e${EMULATION_NAME}.c <<EOF
  54 };
  55
  56 static const struct _ovl_stream ovl_mgr_stream = {
  57   ovl_mgr,
  58   ovl_mgr + sizeof (ovl_mgr)
  59 };
  60
  61 static asection *toe = NULL;
  62
  63
  64 static int
  65 is_spu_target (void)
  66 {
  67   extern const bfd_target bfd_elf32_spu_vec;
  68
  69   return link_info.hash->creator == &bfd_elf32_spu_vec;
  70 }
  71
  72 /* Create our note section.  */
  73
  74 static void
  75 spu_after_open (void)
  76 {
  77   if (is_spu_target ()
  78       && !link_info.relocatable
  79       && link_info.input_bfds != NULL
  80       && !spu_elf_create_sections (output_bfd, &link_info,
  81                                    stack_analysis, emit_stack_syms))
  82     einfo ("%X%P: can not create note section: %E\n");
  83
  84   gld${EMULATION_NAME}_after_open ();
  85 }
  86
  87 /* Add section S at the end of output section OUTPUT_NAME.
  88
  89    Really, we should be duplicating ldlang.c map_input_to_output_sections
  90    logic here, ie. using the linker script to find where the section
  91    goes.  That's rather a lot of code, and we don't want to run
  92    map_input_to_output_sections again because most sections are already
  93    mapped.  So cheat, and put the section in a fixed place, ignoring any
  94    attempt via a linker script to put .stub, .ovtab, and built-in
  95    overlay manager code somewhere else.  */
  96
  97 static void
  98 spu_place_special_section (asection *s, const char *output_name)
  99 {
 100   lang_output_section_statement_type *os;
 101
 102   os = lang_output_section_find (output_name);
 103   if (os == NULL)
 104     {
 105       const char *save = s->name;
 106       s->name = output_name;
 107       gld${EMULATION_NAME}_place_orphan (s);
 108       s->name = save;
 109     }
 110   else
 111     lang_add_section (&os->children, s, os);
 112
 113   s->output_section->size += s->size;
 114 }
 115
 116 /* Load built-in overlay manager, and tweak overlay section alignment.  */
 117
 118 static void
 119 spu_elf_load_ovl_mgr (void)
 120 {
 121   lang_output_section_statement_type *os;
 122   struct elf_link_hash_entry *h;
 123
 124   h = elf_link_hash_lookup (elf_hash_table (&link_info),
 125                             "__ovly_load", FALSE, FALSE, FALSE);
 126
 127   if (h != NULL
 128       && (h->root.type == bfd_link_hash_defined
 129           || h->root.type == bfd_link_hash_defweak)
 130       && h->def_regular)
 131     {
 132       /* User supplied __ovly_load.  */
 133     }
 134   else if (ovl_mgr_stream.start == ovl_mgr_stream.end)
 135     einfo ("%F%P: no built-in overlay manager\n");
 136   else
 137     {
 138       lang_input_statement_type *ovl_is;
 139
 140       ovl_is = lang_add_input_file ("builtin ovl_mgr",
 141                                     lang_input_file_is_file_enum,
 142                                     NULL);
 143
 144       if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream))
 145         einfo ("%X%P: can not open built-in overlay manager: %E\n");
 146       else
 147         {
 148           asection *in;
 149
 150           if (!load_symbols (ovl_is, NULL))
 151             einfo ("%X%P: can not load built-in overlay manager: %E\n");
 152
 153           /* Map overlay manager sections to output sections.  */
 154           for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next)
 155             if ((in->flags & (SEC_ALLOC | SEC_LOAD))
 156                 == (SEC_ALLOC | SEC_LOAD))
 157               spu_place_special_section (in, ".text");
 158         }
 159     }
 160
 161   /* Ensure alignment of overlay sections is sufficient.  */
 162   for (os = &lang_output_section_statement.head->output_section_statement;
 163        os != NULL;
 164        os = os->next)
 165     if (os->bfd_section != NULL
 166         && spu_elf_section_data (os->bfd_section) != NULL
 167         && spu_elf_section_data (os->bfd_section)->ovl_index != 0)
 168       {
 169         if (os->bfd_section->alignment_power < 4)
 170           os->bfd_section->alignment_power = 4;
 171
 172         /* Also ensure size rounds up.  */
 173         os->block_value = 16;
 174       }
 175 }
 176
 177 /* Go find if we need to do anything special for overlays.  */
 178
 179 static void
 180 spu_before_allocation (void)
 181 {
 182   if (is_spu_target ()
 183       && !link_info.relocatable
 184       && !no_overlays)
 185     {
 186       /* Size the sections.  This is premature, but we need to know the
 187          rough layout so that overlays can be found.  */
 188       expld.phase = lang_mark_phase_enum;
 189       expld.dataseg.phase = exp_dataseg_none;
 190       one_lang_size_sections_pass (NULL, TRUE);
 191
 192       /* Find overlays by inspecting section vmas.  */
 193       if (spu_elf_find_overlays (output_bfd, &link_info))
 194         {
 195           asection *stub, *ovtab;
 196
 197           if (!spu_elf_size_stubs (output_bfd, &link_info, non_overlay_stubs,
 198                                    stack_analysis, &stub, &ovtab, &toe))
 199             einfo ("%X%P: can not size overlay stubs: %E\n");
 200
 201           if (stub != NULL)
 202             {
 203               spu_place_special_section (stub, ".text");
 204               spu_place_special_section (ovtab, ".data");
 205               spu_place_special_section (toe, ".toe");
 206
 207               spu_elf_load_ovl_mgr ();
 208             }
 209         }
 210
 211       /* We must not cache anything from the preliminary sizing.  */
 212       lang_reset_memory_regions ();
 213     }
 214
 215   gld${EMULATION_NAME}_before_allocation ();
 216 }
 217
 218 /* Final emulation specific call.  */
 219
 220 static void
 221 gld${EMULATION_NAME}_finish (void)
 222 {
 223   int need_laying_out;
 224
 225   need_laying_out = bfd_elf_discard_info (output_bfd, &link_info);
 226
 227   gld${EMULATION_NAME}_map_segments (need_laying_out);
 228
 229   if (is_spu_target () && local_store_lo < local_store_hi)
 230     {
 231       asection *s;
 232
 233       s = spu_elf_check_vma (output_bfd, local_store_lo, local_store_hi);
 234       if (s != NULL)
 235         einfo ("%X%P: %A exceeds local store range\n", s);
 236     }
 237
 238   if (toe != NULL
 239       && !spu_elf_build_stubs (&link_info,
 240                                emit_stub_syms || link_info.emitrelocations,
 241                                toe))
 242     einfo ("%X%P: can not build overlay stubs: %E\n");
 243
 244   finish_default ();
 245 }
 246
 247 EOF
 248
 249 if grep -q 'ld_elf.*ppc.*_emulation' ldemul-list.h; then
 250   cat >>e${EMULATION_NAME}.c <<EOF
 251 #include "filenames.h"
 252 #include <fcntl.h>
 253 #include <sys/wait.h>
 254
 255 struct tflist {
 256   struct tflist *next;
 257   char name[9];
 258 };
 259
 260 static struct tflist *tmp_file_list;
 261
 262 static void clean_tmp (void)
 263 {
 264   for (; tmp_file_list != NULL; tmp_file_list = tmp_file_list->next)
 265     unlink (tmp_file_list->name);
 266 }
 267
 268 static const char *
 269 base_name (const char *path)
 270 {
 271   const char *file = strrchr (path, '/');
 272 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 273   {
 274     char *bslash = strrchr (path, '\\\\');
 275
 276     if (file == NULL || (bslash != NULL && bslash > file))
 277       file = bslash;
 278     if (file == NULL
 279         && path[0] != '\0'
 280         && path[1] == ':')
 281       file = path + 1;
 282   }
 283 #endif
 284   if (file == NULL)
 285     file = path;
 286   else
 287     ++file;
 288   return file;
 289 }
 290
 291 /* This function is called when building a ppc32 or ppc64 executable
 292    to handle embedded spu images.  */
 293 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 294
 295 bfd_boolean
 296 embedded_spu_file (lang_input_statement_type *entry, const char *flags)
 297 {
 298   const char *cmd[6];
 299   const char *sym;
 300   char *handle, *p;
 301   struct tflist *tf;
 302   char *oname;
 303   int fd;
 304   pid_t pid;
 305   int status;
 306   union lang_statement_union **old_stat_tail;
 307   union lang_statement_union **old_file_tail;
 308   union lang_statement_union *new_ent;
 309   lang_input_statement_type *search;
 310
 311   if (entry->the_bfd->format != bfd_object
 312       || strcmp (entry->the_bfd->xvec->name, "elf32-spu") != 0
 313       || (entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_EXEC
 314           && entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_DYN))
 315     return FALSE;
 316
 317   /* Use the filename as the symbol marking the program handle struct.  */
 318   sym = base_name (entry->the_bfd->filename);
 319
 320   handle = xstrdup (sym);
 321   for (p = handle; *p; ++p)
 322     if (!(ISALNUM (*p) || *p == '$' || *p == '.'))
 323       *p = '_';
 324
 325   if (tmp_file_list == NULL)
 326     atexit (clean_tmp);
 327   tf = xmalloc (sizeof (*tf));
 328   tf->next = tmp_file_list;
 329   tmp_file_list = tf;
 330   oname = tf->name;
 331   memcpy (tf->name, "ldXXXXXX", sizeof (tf->name));
 332
 333 #ifdef HAVE_MKSTEMP
 334   fd = mkstemp (oname);
 335 #else
 336   oname = mktemp (oname);
 337   if (oname == NULL)
 338     return FALSE;
 339   fd = open (oname, O_RDWR | O_CREAT | O_EXCL, 0600);
 340 #endif
 341   if (fd == -1)
 342     return FALSE;
 343   close (fd);
 344
 345   for (search = (lang_input_statement_type *) input_file_chain.head;
 346        search != NULL;
 347        search = (lang_input_statement_type *) search->next_real_file)
 348     {
 349       const char *infile = base_name (search->filename);
 350
 351       if (infile != NULL
 352           && strncmp (infile, "crtbegin", 8) == 0)
 353         {
 354           if (infile[8] == 'S')
 355             flags = concat (flags, " -fPIC", NULL);
 356           else if (infile[8] == 'T')
 357             flags = concat (flags, " -fpie", NULL);
 358           break;
 359         }
 360     }
 361
 362   /* Use fork() and exec() rather than system() so that we don't
 363      need to worry about quoting args.  */
 364   cmd[0] = EMBEDSPU;
 365   cmd[1] = flags;
 366   cmd[2] = handle;
 367   cmd[3] = entry->the_bfd->filename;
 368   cmd[4] = oname;
 369   cmd[5] = NULL;
 370   if (trace_file_tries)
 371     {
 372       info_msg (_("running: %s \"%s\" \"%s\" \"%s\" \"%s\"\n"),
 373                 cmd[0], cmd[1], cmd[2], cmd[3], cmd[4]);
 374       fflush (stdout);
 375     }
 376
 377   pid = fork ();
 378   if (pid == -1)
 379     return FALSE;
 380   if (pid == 0)
 381     {
 382       execvp (cmd[0], (char *const *) cmd);
 383       if (strcmp ("embedspu", EMBEDSPU) != 0)
 384         {
 385           cmd[0] = "embedspu";
 386           execvp (cmd[0], (char *const *) cmd);
 387         }
 388       perror (cmd[0]);
 389       _exit (127);
 390     }
 391 #ifdef HAVE_WAITPID
 392 #define WAITFOR(PID, STAT) waitpid (PID, STAT, 0)
 393 #else
 394 #define WAITFOR(PID, STAT) wait (STAT)
 395 #endif
 396   if (WAITFOR (pid, &status) != pid
 397       || !WIFEXITED (status)
 398       || WEXITSTATUS (status) != 0)
 399     return FALSE;
 400 #undef WAITFOR
 401
 402   old_stat_tail = stat_ptr->tail;
 403   old_file_tail = input_file_chain.tail;
 404   if (lang_add_input_file (oname, lang_input_file_is_file_enum, NULL) == NULL)
 405     return FALSE;
 406
 407   /* lang_add_input_file put the new list entry at the end of the statement
 408      and input file lists.  Move it to just after the current entry.  */
 409   new_ent = *old_stat_tail;
 410   *old_stat_tail = NULL;
 411   stat_ptr->tail = old_stat_tail;
 412   *old_file_tail = NULL;
 413   input_file_chain.tail = old_file_tail;
 414   new_ent->header.next = entry->header.next;
 415   entry->header.next = new_ent;
 416   new_ent->input_statement.next_real_file = entry->next_real_file;
 417   entry->next_real_file = new_ent;
 418
 419   /* Ensure bfd sections are excluded from the output.  */
 420   bfd_section_list_clear (entry->the_bfd);
 421   entry->loaded = TRUE;
 422   return TRUE;
 423 }
 424
 425 EOF
 426 fi
 427
 428 # Define some shell vars to insert bits of code into the standard elf
 429 # parse_args and list_options functions.
 430 #
 431 PARSE_AND_LIST_PROLOGUE='
 432 #define OPTION_SPU_PLUGIN               301
 433 #define OPTION_SPU_NO_OVERLAYS          (OPTION_SPU_PLUGIN + 1)
 434 #define OPTION_SPU_STUB_SYMS            (OPTION_SPU_NO_OVERLAYS + 1)
 435 #define OPTION_SPU_NON_OVERLAY_STUBS    (OPTION_SPU_STUB_SYMS + 1)
 436 #define OPTION_SPU_LOCAL_STORE          (OPTION_SPU_NON_OVERLAY_STUBS + 1)
 437 #define OPTION_SPU_STACK_ANALYSIS       (OPTION_SPU_LOCAL_STORE + 1)
 438 #define OPTION_SPU_STACK_SYMS           (OPTION_SPU_STACK_ANALYSIS + 1)
 439 '
 440
 441 PARSE_AND_LIST_LONGOPTS='
 442   { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN },
 443   { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS },
 444   { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS },
 445   { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS },
 446   { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE },
 447   { "stack-analysis", no_argument, NULL, OPTION_SPU_STACK_ANALYSIS },
 448   { "emit-stack-syms", no_argument, NULL, OPTION_SPU_STACK_SYMS },
 449 '
 450
 451 PARSE_AND_LIST_OPTIONS='
 452   fprintf (file, _("\
 453   --plugin              Make SPU plugin.\n\
 454   --no-overlays         No overlay handling.\n\
 455   --emit-stub-syms      Add symbols on overlay call stubs.\n\
 456   --extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\
 457   --local-store=lo:hi   Valid address range.\n\
 458   --stack-analysis      Estimate maximum stack requirement.\n\
 459   --emit-stack-syms     Add __stack_func giving stack needed for each func.\n"
 460                    ));
 461 '
 462
 463 PARSE_AND_LIST_ARGS_CASES='
 464     case OPTION_SPU_PLUGIN:
 465       spu_elf_plugin (1);
 466       break;
 467
 468     case OPTION_SPU_NO_OVERLAYS:
 469       no_overlays = 1;
 470       break;
 471
 472     case OPTION_SPU_STUB_SYMS:
 473       emit_stub_syms = 1;
 474       break;
 475
 476     case OPTION_SPU_NON_OVERLAY_STUBS:
 477       non_overlay_stubs = 1;
 478       break;
 479
 480     case OPTION_SPU_LOCAL_STORE:
 481       {
 482         char *end;
 483         local_store_lo = strtoul (optarg, &end, 0);
 484         if (*end == '\'':'\'')
 485           {
 486             local_store_hi = strtoul (end + 1, &end, 0);
 487             if (*end == 0)
 488               break;
 489           }
 490         einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg);
 491       }
 492       break;
 493
 494     case OPTION_SPU_STACK_ANALYSIS:
 495       stack_analysis = 1;
 496       break;
 497
 498     case OPTION_SPU_STACK_SYMS:
 499       emit_stack_syms = 1;
 500       break;
 501 '
 502
 503 LDEMUL_AFTER_OPEN=spu_after_open
 504 LDEMUL_BEFORE_ALLOCATION=spu_before_allocation
 505 LDEMUL_FINISH=gld${EMULATION_NAME}_finish