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 # Define some shell vars to insert bits of code into the standard elf
 242 # parse_args and list_options functions.
 243 #
 244 PARSE_AND_LIST_PROLOGUE='
 245 #define OPTION_SPU_PLUGIN               301
 246 #define OPTION_SPU_NO_OVERLAYS          (OPTION_SPU_PLUGIN + 1)
 247 #define OPTION_SPU_STUB_SYMS            (OPTION_SPU_NO_OVERLAYS + 1)
 248 #define OPTION_SPU_NON_OVERLAY_STUBS    (OPTION_SPU_STUB_SYMS + 1)
 249 #define OPTION_SPU_LOCAL_STORE          (OPTION_SPU_NON_OVERLAY_STUBS + 1)
 250 '
 251
 252 PARSE_AND_LIST_LONGOPTS='
 253   { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN },
 254   { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS },
 255   { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS },
 256   { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS },
 257   { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE },
 258 '
 259
 260 PARSE_AND_LIST_OPTIONS='
 261   fprintf (file, _("\
 262   --plugin              Make SPU plugin.\n\
 263   --no-overlays         No overlay handling.\n\
 264   --emit-stub-syms      Add symbols on overlay call stubs.\n\
 265   --extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\
 266   --local-store=lo:hi   Valid address range.\n"
 267                    ));
 268 '
 269
 270 PARSE_AND_LIST_ARGS_CASES='
 271     case OPTION_SPU_PLUGIN:
 272       spu_elf_plugin (1);
 273       break;
 274
 275     case OPTION_SPU_NO_OVERLAYS:
 276       no_overlays = 1;
 277       break;
 278
 279     case OPTION_SPU_STUB_SYMS:
 280       emit_stub_syms = 1;
 281       break;
 282
 283     case OPTION_SPU_NON_OVERLAY_STUBS:
 284       non_overlay_stubs = 1;
 285       break;
 286
 287     case OPTION_SPU_LOCAL_STORE:
 288       {
 289         char *end;
 290         local_store_lo = strtoul (optarg, &end, 0);
 291         if (*end == '\'':'\'')
 292           {
 293             local_store_hi = strtoul (end + 1, &end, 0);
 294             if (*end == 0)
 295               break;
 296           }
 297         einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg);
 298       }
 299       break;
 300 '
 301
 302 LDEMUL_AFTER_OPEN=spu_after_open
 303 LDEMUL_BEFORE_ALLOCATION=spu_before_allocation
 304 LDEMUL_FINISH=gld${EMULATION_NAME}_finish