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