ld/emultempl/ppc32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2003-2014 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 powerpc32-elf
  23 # specific routines.
  24 #
  25 fragment <<EOF
  26
  27 #include "libbfd.h"
  28 #include "elf32-ppc.h"
  29 #include "ldlex.h"
  30
  31 #define is_ppc_elf(bfd) \
  32   (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
  33    && elf_object_id (bfd) == PPC32_ELF_DATA)
  34
  35 /* Whether to run tls optimization.  */
  36 static int notlsopt = 0;
  37
  38 /* Choose the correct place for .got.  */
  39 static int old_got = 0;
  40
  41 static bfd_vma pagesize = 0;
  42
  43 static struct ppc_elf_params params = { PLT_UNSET, -1, 0, 0, 0, 0 };
  44
  45 static void
  46 ppc_after_open_output (void)
  47 {
  48   if (params.emit_stub_syms < 0)
  49     params.emit_stub_syms = link_info.emitrelocations || link_info.shared;
  50   if (pagesize == 0)
  51     pagesize = config.commonpagesize;
  52   params.pagesize_p2 = bfd_log2 (pagesize);
  53   ppc_elf_link_params (&link_info, &params);
  54 }
  55
  56 EOF
  57
  58 # No --secure-plt, --bss-plt, or --sdata-got for vxworks.
  59 if test -z "$VXWORKS_BASE_EM_FILE" ; then
  60   fragment <<EOF
  61 static void
  62 ppc_after_open (void)
  63 {
  64   if (is_ppc_elf (link_info.output_bfd))
  65     {
  66       int new_plt;
  67       int keep_new;
  68       unsigned int num_plt;
  69       unsigned int num_got;
  70       lang_output_section_statement_type *os;
  71       lang_output_section_statement_type *plt_os[2];
  72       lang_output_section_statement_type *got_os[2];
  73
  74       new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
  75       if (new_plt < 0)
  76         einfo ("%X%P: select_plt_layout problem %E\n");
  77
  78       num_got = 0;
  79       num_plt = 0;
  80       for (os = &lang_output_section_statement.head->output_section_statement;
  81            os != NULL;
  82            os = os->next)
  83         {
  84           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  85             {
  86               if (num_plt < 2)
  87                 plt_os[num_plt] = os;
  88               ++num_plt;
  89             }
  90           if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
  91             {
  92               if (num_got < 2)
  93                 got_os[num_got] = os;
  94               ++num_got;
  95             }
  96         }
  97
  98       keep_new = new_plt == 1 ? 0 : -1;
  99       if (num_plt == 2)
 100         {
 101           plt_os[0]->constraint = keep_new;
 102           plt_os[1]->constraint = ~keep_new;
 103         }
 104       if (num_got == 2)
 105         {
 106           if (old_got)
 107             keep_new = -1;
 108           got_os[0]->constraint = keep_new;
 109           got_os[1]->constraint = ~keep_new;
 110         }
 111     }
 112
 113   gld${EMULATION_NAME}_after_open ();
 114 }
 115
 116 EOF
 117 fi
 118 fragment <<EOF
 119 static void
 120 ppc_before_allocation (void)
 121 {
 122   if (is_ppc_elf (link_info.output_bfd))
 123     {
 124       if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
 125           && !notlsopt)
 126         {
 127           if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
 128             {
 129               einfo ("%X%P: TLS problem %E\n");
 130               return;
 131             }
 132         }
 133     }
 134
 135   gld${EMULATION_NAME}_before_allocation ();
 136
 137   if (RELAXATION_ENABLED)
 138     params.branch_trampolines = 1;
 139
 140   /* Turn on relaxation if executable sections have addresses that
 141      might make branches overflow.  */
 142   else if (!RELAXATION_DISABLED_BY_USER)
 143     {
 144       bfd_vma low = (bfd_vma) -1;
 145       bfd_vma high = 0;
 146       asection *o;
 147
 148       /* Run lang_size_sections (if not already done).  */
 149       if (expld.phase != lang_mark_phase_enum)
 150         {
 151           expld.phase = lang_mark_phase_enum;
 152           expld.dataseg.phase = exp_dataseg_none;
 153           one_lang_size_sections_pass (NULL, FALSE);
 154           lang_reset_memory_regions ();
 155         }
 156
 157       for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
 158         {
 159           if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
 160             continue;
 161           if (o->rawsize == 0)
 162             continue;
 163           if (low > o->vma)
 164             low = o->vma;
 165           if (high < o->vma + o->rawsize - 1)
 166             high = o->vma + o->rawsize - 1;
 167         }
 168       if (high > low && high - low > (1 << 25) - 1)
 169         params.branch_trampolines = 1;
 170     }
 171
 172   if (params.ppc476_workaround || params.branch_trampolines)
 173     ENABLE_RELAXATION;
 174 }
 175
 176 EOF
 177
 178 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
 179   fragment <<EOF
 180 /* Special handling for embedded SPU executables.  */
 181 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 182 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
 183
 184 static bfd_boolean
 185 ppc_recognized_file (lang_input_statement_type *entry)
 186 {
 187   if (embedded_spu_file (entry, "-m32"))
 188     return TRUE;
 189
 190   return gld${EMULATION_NAME}_load_symbols (entry);
 191 }
 192
 193 EOF
 194 LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
 195 fi
 196
 197 # Define some shell vars to insert bits of code into the standard elf
 198 # parse_args and list_options functions.
 199 #
 200 PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
 201 #define OPTION_NO_TLS_OPT               321
 202 #define OPTION_NO_TLS_GET_ADDR_OPT      (OPTION_NO_TLS_OPT + 1)
 203 #define OPTION_NEW_PLT                  (OPTION_NO_TLS_GET_ADDR_OPT + 1)
 204 #define OPTION_OLD_PLT                  (OPTION_NEW_PLT + 1)
 205 #define OPTION_OLD_GOT                  (OPTION_OLD_PLT + 1)
 206 #define OPTION_STUBSYMS                 (OPTION_OLD_GOT + 1)
 207 #define OPTION_NO_STUBSYMS              (OPTION_STUBSYMS + 1)
 208 #define OPTION_PPC476_WORKAROUND        (OPTION_NO_STUBSYMS + 1)
 209 #define OPTION_NO_PPC476_WORKAROUND     (OPTION_PPC476_WORKAROUND + 1)
 210 '
 211
 212 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
 213   { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
 214   { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
 215   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
 216   { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },'
 217 if test -z "$VXWORKS_BASE_EM_FILE" ; then
 218   PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
 219   { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
 220   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
 221   { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
 222 fi
 223 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
 224   { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
 225   { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
 226 '
 227
 228 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
 229   fprintf (file, _("\
 230   --emit-stub-syms            Label linker stubs with a symbol.\n\
 231   --no-emit-stub-syms         Don'\''t label linker stubs with a symbol.\n\
 232   --no-tls-optimize           Don'\''t try to optimize TLS accesses.\n\
 233   --no-tls-get-addr-optimize  Don'\''t use a special __tls_get_addr call.\n'
 234 if test -z "$VXWORKS_BASE_EM_FILE" ; then
 235   PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
 236   --secure-plt                Use new-style PLT if possible.\n\
 237   --bss-plt                   Force old-style BSS PLT.\n\
 238   --sdata-got                 Force GOT location just before .sdata.\n'
 239 fi
 240 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
 241   --ppc476-workaround [=pagesize]\n\
 242                               Avoid a cache bug on ppc476.\n\
 243   --no-ppc476-workaround      Disable workaround.\n"
 244                    ));
 245 '
 246
 247 PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
 248     case OPTION_STUBSYMS:
 249       params.emit_stub_syms = 1;
 250       break;
 251
 252     case OPTION_NO_STUBSYMS:
 253       params.emit_stub_syms = 0;
 254       break;
 255
 256     case OPTION_NO_TLS_OPT:
 257       notlsopt = 1;
 258       break;
 259
 260     case OPTION_NO_TLS_GET_ADDR_OPT:
 261       params.no_tls_get_addr_opt = 1;
 262       break;
 263
 264     case OPTION_NEW_PLT:
 265       params.plt_style = PLT_NEW;
 266       break;
 267
 268     case OPTION_OLD_PLT:
 269       params.plt_style = PLT_OLD;
 270       break;
 271
 272     case OPTION_OLD_GOT:
 273       old_got = 1;
 274       break;
 275
 276     case OPTION_TRADITIONAL_FORMAT:
 277       notlsopt = 1;
 278       params.no_tls_get_addr_opt = 1;
 279       return FALSE;
 280
 281     case OPTION_PPC476_WORKAROUND:
 282       params.ppc476_workaround = 1;
 283       if (optarg != NULL)
 284         {
 285           char *end;
 286           pagesize = strtoul (optarg, &end, 0);
 287           if (*end
 288               || (pagesize < 4096 && pagesize != 0)
 289               || pagesize != (pagesize & -pagesize))
 290             einfo (_("%P%F: invalid pagesize `%s'\''\n"), optarg);
 291         }
 292       break;
 293
 294     case OPTION_NO_PPC476_WORKAROUND:
 295       params.ppc476_workaround = 0;
 296       break;
 297 '
 298
 299 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 300 #
 301 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
 302 if test -z "$VXWORKS_BASE_EM_FILE" ; then
 303   LDEMUL_AFTER_OPEN=ppc_after_open
 304 fi
 305 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation