ld/emultempl/mipself.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2004-2019 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 case ${target} in
  22   *-*-*gnu*)
  23     gnu_target=TRUE
  24     ;;
  25   *)
  26     gnu_target=FALSE
  27     ;;
  28 esac
  29
  30 fragment <<EOF
  31
  32 #include "ldctor.h"
  33 #include "elf/mips.h"
  34 #include "elfxx-mips.h"
  35
  36 #define is_mips_elf(bfd)                                \
  37   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
  38    && elf_tdata (bfd) != NULL                           \
  39    && elf_object_id (bfd) == MIPS_ELF_DATA)
  40
  41 /* Fake input file for stubs.  */
  42 static lang_input_statement_type *stub_file;
  43 static bfd *stub_bfd;
  44
  45 static bfd_boolean insn32;
  46 static bfd_boolean ignore_branch_isa;
  47
  48 static void
  49 mips_after_parse (void)
  50 {
  51   /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
  52      ways.  .gnu.hash needs symbols to be grouped by hash code whereas the
  53      MIPS ABI requires a mapping between the GOT and the symbol table.  */
  54   if (link_info.emit_gnu_hash)
  55     {
  56       einfo (_("%X%P: .gnu.hash is incompatible with the MIPS ABI\n"));
  57       link_info.emit_hash = TRUE;
  58       link_info.emit_gnu_hash = FALSE;
  59     }
  60   gld${EMULATION_NAME}_after_parse ();
  61 }
  62
  63 struct hook_stub_info
  64 {
  65   lang_statement_list_type add;
  66   asection *input_section;
  67 };
  68
  69 /* Traverse the linker tree to find the spot where the stub goes.  */
  70
  71 static bfd_boolean
  72 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
  73 {
  74   lang_statement_union_type *l;
  75   bfd_boolean ret;
  76
  77   for (; (l = *lp) != NULL; lp = &l->header.next)
  78     {
  79       switch (l->header.type)
  80         {
  81         case lang_constructors_statement_enum:
  82           ret = hook_in_stub (info, &constructor_list.head);
  83           if (ret)
  84             return ret;
  85           break;
  86
  87         case lang_output_section_statement_enum:
  88           ret = hook_in_stub (info,
  89                               &l->output_section_statement.children.head);
  90           if (ret)
  91             return ret;
  92           break;
  93
  94         case lang_wild_statement_enum:
  95           ret = hook_in_stub (info, &l->wild_statement.children.head);
  96           if (ret)
  97             return ret;
  98           break;
  99
 100         case lang_group_statement_enum:
 101           ret = hook_in_stub (info, &l->group_statement.children.head);
 102           if (ret)
 103             return ret;
 104           break;
 105
 106         case lang_input_section_enum:
 107           if (info->input_section == NULL
 108               || l->input_section.section == info->input_section)
 109             {
 110               /* We've found our section.  Insert the stub immediately
 111                  before its associated input section.  */
 112               *lp = info->add.head;
 113               *(info->add.tail) = l;
 114               return TRUE;
 115             }
 116           break;
 117
 118         case lang_data_statement_enum:
 119         case lang_reloc_statement_enum:
 120         case lang_object_symbols_statement_enum:
 121         case lang_output_statement_enum:
 122         case lang_target_statement_enum:
 123         case lang_input_statement_enum:
 124         case lang_assignment_statement_enum:
 125         case lang_padding_statement_enum:
 126         case lang_address_statement_enum:
 127         case lang_fill_statement_enum:
 128           break;
 129
 130         default:
 131           FAIL ();
 132           break;
 133         }
 134     }
 135   return FALSE;
 136 }
 137
 138 /* Create a new stub section called STUB_SEC_NAME and arrange for it to
 139    be linked in OUTPUT_SECTION.  The section should go at the beginning of
 140    OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
 141    before INPUT_SECTION.  */
 142
 143 static asection *
 144 mips_add_stub_section (const char *stub_sec_name, asection *input_section,
 145                        asection *output_section)
 146 {
 147   asection *stub_sec;
 148   flagword flags;
 149   lang_output_section_statement_type *os;
 150   struct hook_stub_info info;
 151
 152   /* PR 12845: If the input section has been garbage collected it will
 153      not have its output section set to *ABS*.  */
 154   if (bfd_is_abs_section (output_section))
 155     return NULL;
 156
 157   /* Create the stub file, if we haven't already.  */
 158   if (stub_file == NULL)
 159     {
 160       stub_file = lang_add_input_file ("linker stubs",
 161                                        lang_input_file_is_fake_enum,
 162                                        NULL);
 163       stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
 164       if (stub_bfd == NULL
 165           || !bfd_set_arch_mach (stub_bfd,
 166                                  bfd_get_arch (link_info.output_bfd),
 167                                  bfd_get_mach (link_info.output_bfd)))
 168         {
 169           einfo (_("%F%P: can not create BFD: %E\n"));
 170           return NULL;
 171         }
 172       stub_bfd->flags |= BFD_LINKER_CREATED;
 173       stub_file->the_bfd = stub_bfd;
 174       ldlang_add_file (stub_file);
 175     }
 176
 177   /* Create the section.  */
 178   stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
 179   if (stub_sec == NULL)
 180     goto err_ret;
 181
 182   /* Set the flags.  */
 183   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 184            | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
 185   if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
 186     goto err_ret;
 187
 188   os = lang_output_section_get (output_section);
 189
 190   /* Initialize a statement list that contains only the new statement.  */
 191   lang_list_init (&info.add);
 192   lang_add_section (&info.add, stub_sec, NULL, os);
 193   if (info.add.head == NULL)
 194     goto err_ret;
 195
 196   /* Insert the new statement in the appropriate place.  */
 197   info.input_section = input_section;
 198   if (hook_in_stub (&info, &os->children.head))
 199     return stub_sec;
 200
 201  err_ret:
 202   einfo (_("%X%P: can not make stub section: %E\n"));
 203   return NULL;
 204 }
 205
 206 /* This is called before the input files are opened.  */
 207
 208 static void
 209 mips_create_output_section_statements (void)
 210 {
 211   struct elf_link_hash_table *htab;
 212
 213   htab = elf_hash_table (&link_info);
 214   if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd))
 215     _bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa,
 216                                 ${gnu_target});
 217
 218   if (is_mips_elf (link_info.output_bfd))
 219     _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
 220 }
 221
 222 /* This is called after we have merged the private data of the input bfds.  */
 223
 224 static void
 225 mips_before_allocation (void)
 226 {
 227   if (is_mips_elf (link_info.output_bfd))
 228     {
 229       flagword flags;
 230
 231       flags = elf_elfheader (link_info.output_bfd)->e_flags;
 232       if (!bfd_link_pic (&link_info)
 233           && !link_info.nocopyreloc
 234           && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
 235         _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
 236     }
 237
 238   gld${EMULATION_NAME}_before_allocation ();
 239 }
 240
 241 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 242    check_needed routines.  */
 243
 244 static void (*real_func) (lang_input_statement_type *);
 245
 246 static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
 247 {
 248   if (l != stub_file)
 249     (*real_func) (l);
 250 }
 251
 252 static void
 253 mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 254 {
 255   real_func = func;
 256   lang_for_each_input_file (&mips_for_each_input_file_wrapper);
 257 }
 258
 259 #define lang_for_each_input_file mips_lang_for_each_input_file
 260
 261 EOF
 262
 263 # Define some shell vars to insert bits of code into the standard elf
 264 # parse_args and list_options functions.
 265 #
 266 PARSE_AND_LIST_PROLOGUE='
 267 enum
 268   {
 269     OPTION_INSN32 = 301,
 270     OPTION_NO_INSN32,
 271     OPTION_IGNORE_BRANCH_ISA,
 272     OPTION_NO_IGNORE_BRANCH_ISA
 273   };
 274 '
 275
 276 PARSE_AND_LIST_LONGOPTS='
 277   { "insn32", no_argument, NULL, OPTION_INSN32 },
 278   { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 },
 279   { "ignore-branch-isa", no_argument, NULL, OPTION_IGNORE_BRANCH_ISA },
 280   { "no-ignore-branch-isa", no_argument, NULL, OPTION_NO_IGNORE_BRANCH_ISA },
 281 '
 282
 283 PARSE_AND_LIST_OPTIONS='
 284   fprintf (file, _("\
 285   --insn32                    Only generate 32-bit microMIPS instructions\n"
 286                    ));
 287   fprintf (file, _("\
 288   --no-insn32                 Generate all microMIPS instructions\n"
 289                    ));
 290   fprintf (file, _("\
 291   --ignore-branch-isa         Accept invalid branch relocations requiring\n\
 292                               an ISA mode switch\n"
 293                    ));
 294   fprintf (file, _("\
 295   --no-ignore-branch-isa      Reject invalid branch relocations requiring\n\
 296                               an ISA mode switch\n"
 297                    ));
 298 '
 299
 300 PARSE_AND_LIST_ARGS_CASES='
 301     case OPTION_INSN32:
 302       insn32 = TRUE;
 303       break;
 304
 305     case OPTION_NO_INSN32:
 306       insn32 = FALSE;
 307       break;
 308
 309     case OPTION_IGNORE_BRANCH_ISA:
 310       ignore_branch_isa = TRUE;
 311       break;
 312
 313     case OPTION_NO_IGNORE_BRANCH_ISA:
 314       ignore_branch_isa = FALSE;
 315       break;
 316 '
 317
 318 LDEMUL_AFTER_PARSE=mips_after_parse
 319 LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
 320 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements