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 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 along
  17 # with this program; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  19 #
  20
  21 # This file is sourced from elf32.em, and defines extra spu specific
  22 # features.
  23 #
  24 cat >>e${EMULATION_NAME}.c <<EOF
  25 #include "ldctor.h"
  26 #include "elf32-spu.h"
  27
  28 /* Non-zero if no overlay processing should be done.  */
  29 static int no_overlays = 0;
  30
  31 /* Non-zero if we want stubs on all calls out of overlay regions.  */
  32 static int non_overlay_stubs = 0;
  33
  34 /* Whether to emit symbols for stubs.  */
  35 static int emit_stub_syms = 0;
  36
  37 /* Non-zero to perform stack space analysis.  */
  38 static int stack_analysis = 0;
  39
  40 /* Whether to emit symbols with stack requirements for each function.  */
  41 static int emit_stack_syms = 0;
  42
  43 /* Range of valid addresses for loadable sections.  */
  44 static bfd_vma local_store_lo = 0;
  45 static bfd_vma local_store_hi = 0x3ffff;
  46
  47 static const char ovl_mgr[] = {
  48 EOF
  49
  50 ../binutils/bin2c < ${srcdir}/emultempl/spu_ovl.o >> e${EMULATION_NAME}.c
  51
  52 cat >>e${EMULATION_NAME}.c <<EOF
  53 };
  54
  55 static const struct _ovl_stream ovl_mgr_stream = {
  56   ovl_mgr,
  57   ovl_mgr + sizeof (ovl_mgr)
  58 };
  59
  60 static asection *toe = NULL;
  61
  62
  63 static int
  64 is_spu_target (void)
  65 {
  66   extern const bfd_target bfd_elf32_spu_vec;
  67
  68   return link_info.hash->creator == &bfd_elf32_spu_vec;
  69 }
  70
  71 /* Create our note section.  */
  72
  73 static void
  74 spu_after_open (void)
  75 {
  76   if (is_spu_target ()
  77       && !link_info.relocatable
  78       && link_info.input_bfds != NULL
  79       && !spu_elf_create_sections (output_bfd, &link_info,
  80                                    stack_analysis, emit_stack_syms))
  81     einfo ("%X%P: can not create note section: %E\n");
  82
  83   gld${EMULATION_NAME}_after_open ();
  84 }
  85
  86 /* Add section S at the end of output section OUTPUT_NAME.
  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, const char *output_name)
  98 {
  99   lang_output_section_statement_type *os;
 100
 101   os = lang_output_section_find (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
 110     lang_add_section (&os->children, s, os);
 111
 112   s->output_section->size += s->size;
 113 }
 114
 115 /* Load built-in overlay manager, and tweak overlay section alignment.  */
 116
 117 static void
 118 spu_elf_load_ovl_mgr (void)
 119 {
 120   lang_output_section_statement_type *os;
 121   struct elf_link_hash_entry *h;
 122
 123   h = elf_link_hash_lookup (elf_hash_table (&link_info),
 124                             "__ovly_load", FALSE, FALSE, FALSE);
 125
 126   if (h != NULL
 127       && (h->root.type == bfd_link_hash_defined
 128           || h->root.type == bfd_link_hash_defweak)
 129       && h->def_regular)
 130     {
 131       /* User supplied __ovly_load.  */
 132     }
 133   else if (ovl_mgr_stream.start == ovl_mgr_stream.end)
 134     einfo ("%F%P: no built-in overlay manager\n");
 135   else
 136     {
 137       lang_input_statement_type *ovl_is;
 138
 139       ovl_is = lang_add_input_file ("builtin ovl_mgr",
 140                                     lang_input_file_is_file_enum,
 141                                     NULL);
 142
 143       if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream))
 144         einfo ("%X%P: can not open built-in overlay manager: %E\n");
 145       else
 146         {
 147           asection *in;
 148
 149           if (!load_symbols (ovl_is, NULL))
 150             einfo ("%X%P: can not load built-in overlay manager: %E\n");
 151
 152           /* Map overlay manager sections to output sections.  */
 153           for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next)
 154             if ((in->flags & (SEC_ALLOC | SEC_LOAD))
 155                 == (SEC_ALLOC | SEC_LOAD))
 156               spu_place_special_section (in, ".text");
 157         }
 158     }
 159
 160   /* Ensure alignment of overlay sections is sufficient.  */
 161   for (os = &lang_output_section_statement.head->output_section_statement;
 162        os != NULL;
 163        os = os->next)
 164     if (os->bfd_section != NULL
 165         && spu_elf_section_data (os->bfd_section) != NULL
 166         && spu_elf_section_data (os->bfd_section)->ovl_index != 0)
 167       {
 168         if (os->bfd_section->alignment_power < 4)
 169           os->bfd_section->alignment_power = 4;
 170
 171         /* Also ensure size rounds up.  */
 172         os->block_value = 16;
 173       }
 174 }
 175
 176 /* Go find if we need to do anything special for overlays.  */
 177
 178 static void
 179 spu_before_allocation (void)
 180 {
 181   if (is_spu_target ()
 182       && !link_info.relocatable
 183       && !no_overlays)
 184     {
 185       /* Size the sections.  This is premature, but we need to know the
 186          rough layout so that overlays can be found.  */
 187       expld.phase = lang_mark_phase_enum;
 188       expld.dataseg.phase = exp_dataseg_none;
 189       one_lang_size_sections_pass (NULL, TRUE);
 190
 191       /* Find overlays by inspecting section vmas.  */
 192       if (spu_elf_find_overlays (output_bfd, &link_info))
 193         {
 194           asection *stub, *ovtab;
 195
 196           if (!spu_elf_size_stubs (output_bfd, &link_info, non_overlay_stubs,
 197                                    stack_analysis, &stub, &ovtab, &toe))
 198             einfo ("%X%P: can not size overlay stubs: %E\n");
 199
 200           if (stub != NULL)
 201             {
 202               spu_place_special_section (stub, ".text");
 203               spu_place_special_section (ovtab, ".data");
 204               spu_place_special_section (toe, ".toe");
 205
 206               spu_elf_load_ovl_mgr ();
 207             }
 208         }
 209
 210       /* We must not cache anything from the preliminary sizing.  */
 211       lang_reset_memory_regions ();
 212     }
 213
 214   gld${EMULATION_NAME}_before_allocation ();
 215 }
 216
 217 /* Final emulation specific call.  */
 218
 219 static void
 220 gld${EMULATION_NAME}_finish (void)
 221 {
 222   int need_laying_out;
 223
 224   need_laying_out = bfd_elf_discard_info (output_bfd, &link_info);
 225
 226   gld${EMULATION_NAME}_map_segments (need_laying_out);
 227
 228   if (is_spu_target () && local_store_lo < local_store_hi)
 229     {
 230       asection *s;
 231
 232       s = spu_elf_check_vma (output_bfd, local_store_lo, local_store_hi);
 233       if (s != NULL)
 234         einfo ("%X%P: %A exceeds local store range\n", s);
 235     }
 236
 237   if (toe != NULL
 238       && !spu_elf_build_stubs (&link_info,
 239                                emit_stub_syms || link_info.emitrelocations,
 240                                toe))
 241     einfo ("%X%P: can not build overlay stubs: %E\n");
 242
 243   finish_default ();
 244 }
 245
 246 EOF
 247
 248 if grep -q 'ld_elf.*ppc.*_emulation' ldemul-list.h; then
 249   cat >>e${EMULATION_NAME}.c <<EOF
 250 #include "filenames.h"
 251 #include <fcntl.h>
 252 #include <sys/wait.h>
 253
 254 struct tflist {
 255   struct tflist *next;
 256   char name[9];
 257 };
 258
 259 static struct tflist *tmp_file_list;
 260
 261 static void clean_tmp (void)
 262 {
 263   for (; tmp_file_list != NULL; tmp_file_list = tmp_file_list->next)
 264     unlink (tmp_file_list->name);
 265 }
 266
 267 static const char *
 268 base_name (const char *path)
 269 {
 270   const char *file = strrchr (path, '/');
 271 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 272   {
 273     char *bslash = strrchr (path, '\\');
 274
 275     if (file == NULL || (bslash != NULL && bslash > file))
 276       file = bslash;
 277     if (file == NULL
 278         && path[0] != '\0'
 279         && path[1] == ':')
 280       file = path + 1;
 281   }
 282 #endif
 283   if (file == NULL)
 284     file = path;
 285   else
 286     ++file;
 287   return file;
 288 }
 289
 290 /* This function is called when building a ppc32 or ppc64 executable
 291    to handle embedded spu images.  */
 292 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 293
 294 bfd_boolean
 295 embedded_spu_file (lang_input_statement_type *entry, const char *flags)
 296 {
 297   const char *cmd[6];
 298   const char *sym;
 299   char *handle, *p;
 300   struct tflist *tf;
 301   char *oname;
 302   int fd;
 303   pid_t pid;
 304   int status;
 305   union lang_statement_union **old_stat_tail;
 306   union lang_statement_union **old_file_tail;
 307   union lang_statement_union *new_ent;
 308   lang_input_statement_type *search;
 309
 310   if (entry->the_bfd->format != bfd_object
 311       || strcmp (entry->the_bfd->xvec->name, "elf32-spu") != 0
 312       || (entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_EXEC
 313           && entry->the_bfd->tdata.elf_obj_data->elf_header->e_type != ET_DYN))
 314     return FALSE;
 315
 316   /* Use the filename as the symbol marking the program handle struct.  */
 317   sym = base_name (entry->the_bfd->filename);
 318
 319   handle = xstrdup (sym);
 320   for (p = handle; *p; ++p)
 321     if (!(ISALNUM (*p) || *p == '$' || *p == '.'))
 322       *p = '_';
 323
 324   if (tmp_file_list == NULL)
 325     atexit (clean_tmp);
 326   tf = xmalloc (sizeof (*tf));
 327   tf->next = tmp_file_list;
 328   tmp_file_list = tf;
 329   oname = tf->name;
 330   memcpy (tf->name, "ldXXXXXX", sizeof (tf->name));
 331
 332 #ifdef HAVE_MKSTEMP
 333   fd = mkstemp (oname);
 334 #else
 335   oname = mktemp (oname);
 336   if (oname == NULL)
 337     return FALSE;
 338   fd = open (oname, O_RDWR | O_CREAT | O_EXCL, 0600);
 339 #endif
 340   if (fd == -1)
 341     return FALSE;
 342   close (fd);
 343
 344   for (search = (lang_input_statement_type *) input_file_chain.head;
 345        search != NULL;
 346        search = (lang_input_statement_type *) search->next_real_file)
 347     {
 348       const char *infile = base_name (search->filename);
 349
 350       if (infile != NULL
 351           && strncmp (infile, "crtbegin", 8) == 0)
 352         {
 353           if (infile[8] == 'S')
 354             flags = concat (flags, " -fPIC", NULL);
 355           else if (infile[8] == 'T')
 356             flags = concat (flags, " -fpie", NULL);
 357           break;
 358         }
 359     }
 360
 361   /* Use fork() and exec() rather than system() so that we don't
 362      need to worry about quoting args.  */
 363   cmd[0] = EMBEDSPU;
 364   cmd[1] = flags;
 365   cmd[2] = handle;
 366   cmd[3] = entry->the_bfd->filename;
 367   cmd[4] = oname;
 368   cmd[5] = NULL;
 369   if (trace_file_tries)
 370     {
 371       info_msg (_("running: %s \"%s\" \"%s\" \"%s\" \"%s\"\n"),
 372                 cmd[0], cmd[1], cmd[2], cmd[3], cmd[4]);
 373       fflush (stdout);
 374     }
 375
 376   pid = fork ();
 377   if (pid == -1)
 378     return FALSE;
 379   if (pid == 0)
 380     {
 381       execvp (cmd[0], (char *const *) cmd);
 382       if (strcmp ("embedspu", EMBEDSPU) != 0)
 383         {
 384           cmd[0] = "embedspu";
 385           execvp (cmd[0], (char *const *) cmd);
 386         }
 387       perror (cmd[0]);
 388       _exit (127);
 389     }
 390 #ifdef HAVE_WAITPID
 391 #define WAITFOR(PID, STAT) waitpid (PID, STAT, 0)
 392 #else
 393 #define WAITFOR(PID, STAT) wait (STAT)
 394 #endif
 395   if (WAITFOR (pid, &status) != pid
 396       || !WIFEXITED (status)
 397       || WEXITSTATUS (status) != 0)
 398     return FALSE;
 399 #undef WAITFOR
 400
 401   old_stat_tail = stat_ptr->tail;
 402   old_file_tail = input_file_chain.tail;
 403   if (lang_add_input_file (oname, lang_input_file_is_file_enum, NULL) == NULL)
 404     return FALSE;
 405
 406   /* lang_add_input_file put the new list entry at the end of the statement
 407      and input file lists.  Move it to just after the current entry.  */
 408   new_ent = *old_stat_tail;
 409   *old_stat_tail = NULL;
 410   stat_ptr->tail = old_stat_tail;
 411   *old_file_tail = NULL;
 412   input_file_chain.tail = old_file_tail;
 413   new_ent->header.next = entry->header.next;
 414   entry->header.next = new_ent;
 415   new_ent->input_statement.next_real_file = entry->next_real_file;
 416   entry->next_real_file = new_ent;
 417
 418   /* Ensure bfd sections are excluded from the output.  */
 419   bfd_section_list_clear (entry->the_bfd);
 420   entry->loaded = TRUE;
 421   return TRUE;
 422 }
 423
 424 EOF
 425 fi
 426
 427 # Define some shell vars to insert bits of code into the standard elf
 428 # parse_args and list_options functions.
 429 #
 430 PARSE_AND_LIST_PROLOGUE='
 431 #define OPTION_SPU_PLUGIN               301
 432 #define OPTION_SPU_NO_OVERLAYS          (OPTION_SPU_PLUGIN + 1)
 433 #define OPTION_SPU_STUB_SYMS            (OPTION_SPU_NO_OVERLAYS + 1)
 434 #define OPTION_SPU_NON_OVERLAY_STUBS    (OPTION_SPU_STUB_SYMS + 1)
 435 #define OPTION_SPU_LOCAL_STORE          (OPTION_SPU_NON_OVERLAY_STUBS + 1)
 436 #define OPTION_SPU_STACK_ANALYSIS       (OPTION_SPU_LOCAL_STORE + 1)
 437 #define OPTION_SPU_STACK_SYMS           (OPTION_SPU_STACK_ANALYSIS + 1)
 438 '
 439
 440 PARSE_AND_LIST_LONGOPTS='
 441   { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN },
 442   { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS },
 443   { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS },
 444   { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS },
 445   { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE },
 446   { "stack-analysis", no_argument, NULL, OPTION_SPU_STACK_ANALYSIS },
 447   { "emit-stack-syms", no_argument, NULL, OPTION_SPU_STACK_SYMS },
 448 '
 449
 450 PARSE_AND_LIST_OPTIONS='
 451   fprintf (file, _("\
 452   --plugin              Make SPU plugin.\n\
 453   --no-overlays         No overlay handling.\n\
 454   --emit-stub-syms      Add symbols on overlay call stubs.\n\
 455   --extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\
 456   --local-store=lo:hi   Valid address range.\n\
 457   --stack-analysis      Estimate maximum stack requirement.\n\
 458   --emit-stack-syms     Add __stack_func giving stack needed for each func.\n"
 459                    ));
 460 '
 461
 462 PARSE_AND_LIST_ARGS_CASES='
 463     case OPTION_SPU_PLUGIN:
 464       spu_elf_plugin (1);
 465       break;
 466
 467     case OPTION_SPU_NO_OVERLAYS:
 468       no_overlays = 1;
 469       break;
 470
 471     case OPTION_SPU_STUB_SYMS:
 472       emit_stub_syms = 1;
 473       break;
 474
 475     case OPTION_SPU_NON_OVERLAY_STUBS:
 476       non_overlay_stubs = 1;
 477       break;
 478
 479     case OPTION_SPU_LOCAL_STORE:
 480       {
 481         char *end;
 482         local_store_lo = strtoul (optarg, &end, 0);
 483         if (*end == '\'':'\'')
 484           {
 485             local_store_hi = strtoul (end + 1, &end, 0);
 486             if (*end == 0)
 487               break;
 488           }
 489         einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg);
 490       }
 491       break;
 492
 493     case OPTION_SPU_STACK_ANALYSIS:
 494       stack_analysis = 1;
 495       break;
 496
 497     case OPTION_SPU_STACK_SYMS:
 498       emit_stack_syms = 1;
 499       break;
 500 '
 501
 502 LDEMUL_AFTER_OPEN=spu_after_open
 503 LDEMUL_BEFORE_ALLOCATION=spu_before_allocation
 504 LDEMUL_FINISH=gld${EMULATION_NAME}_finish