| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2004-2016 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 | fragment <<EOF |
| 22 | |
| 23 | #include "ldctor.h" |
| 24 | #include "elf/mips.h" |
| 25 | #include "elfxx-mips.h" |
| 26 | |
| 27 | #define is_mips_elf(bfd) \ |
| 28 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 29 | && elf_tdata (bfd) != NULL \ |
| 30 | && elf_object_id (bfd) == MIPS_ELF_DATA) |
| 31 | |
| 32 | /* Fake input file for stubs. */ |
| 33 | static lang_input_statement_type *stub_file; |
| 34 | static bfd *stub_bfd; |
| 35 | |
| 36 | static bfd_boolean insn32; |
| 37 | |
| 38 | static void |
| 39 | mips_after_parse (void) |
| 40 | { |
| 41 | /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different |
| 42 | ways. .gnu.hash needs symbols to be grouped by hash code whereas the |
| 43 | MIPS ABI requires a mapping between the GOT and the symbol table. */ |
| 44 | if (link_info.emit_gnu_hash) |
| 45 | { |
| 46 | einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n"); |
| 47 | link_info.emit_hash = TRUE; |
| 48 | link_info.emit_gnu_hash = FALSE; |
| 49 | } |
| 50 | gld${EMULATION_NAME}_after_parse (); |
| 51 | } |
| 52 | |
| 53 | struct hook_stub_info |
| 54 | { |
| 55 | lang_statement_list_type add; |
| 56 | asection *input_section; |
| 57 | }; |
| 58 | |
| 59 | /* Traverse the linker tree to find the spot where the stub goes. */ |
| 60 | |
| 61 | static bfd_boolean |
| 62 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) |
| 63 | { |
| 64 | lang_statement_union_type *l; |
| 65 | bfd_boolean ret; |
| 66 | |
| 67 | for (; (l = *lp) != NULL; lp = &l->header.next) |
| 68 | { |
| 69 | switch (l->header.type) |
| 70 | { |
| 71 | case lang_constructors_statement_enum: |
| 72 | ret = hook_in_stub (info, &constructor_list.head); |
| 73 | if (ret) |
| 74 | return ret; |
| 75 | break; |
| 76 | |
| 77 | case lang_output_section_statement_enum: |
| 78 | ret = hook_in_stub (info, |
| 79 | &l->output_section_statement.children.head); |
| 80 | if (ret) |
| 81 | return ret; |
| 82 | break; |
| 83 | |
| 84 | case lang_wild_statement_enum: |
| 85 | ret = hook_in_stub (info, &l->wild_statement.children.head); |
| 86 | if (ret) |
| 87 | return ret; |
| 88 | break; |
| 89 | |
| 90 | case lang_group_statement_enum: |
| 91 | ret = hook_in_stub (info, &l->group_statement.children.head); |
| 92 | if (ret) |
| 93 | return ret; |
| 94 | break; |
| 95 | |
| 96 | case lang_input_section_enum: |
| 97 | if (info->input_section == NULL |
| 98 | || l->input_section.section == info->input_section) |
| 99 | { |
| 100 | /* We've found our section. Insert the stub immediately |
| 101 | before its associated input section. */ |
| 102 | *lp = info->add.head; |
| 103 | *(info->add.tail) = l; |
| 104 | return TRUE; |
| 105 | } |
| 106 | break; |
| 107 | |
| 108 | case lang_data_statement_enum: |
| 109 | case lang_reloc_statement_enum: |
| 110 | case lang_object_symbols_statement_enum: |
| 111 | case lang_output_statement_enum: |
| 112 | case lang_target_statement_enum: |
| 113 | case lang_input_statement_enum: |
| 114 | case lang_assignment_statement_enum: |
| 115 | case lang_padding_statement_enum: |
| 116 | case lang_address_statement_enum: |
| 117 | case lang_fill_statement_enum: |
| 118 | break; |
| 119 | |
| 120 | default: |
| 121 | FAIL (); |
| 122 | break; |
| 123 | } |
| 124 | } |
| 125 | return FALSE; |
| 126 | } |
| 127 | |
| 128 | /* Create a new stub section called STUB_SEC_NAME and arrange for it to |
| 129 | be linked in OUTPUT_SECTION. The section should go at the beginning of |
| 130 | OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately |
| 131 | before INPUT_SECTION. */ |
| 132 | |
| 133 | static asection * |
| 134 | mips_add_stub_section (const char *stub_sec_name, asection *input_section, |
| 135 | asection *output_section) |
| 136 | { |
| 137 | asection *stub_sec; |
| 138 | flagword flags; |
| 139 | lang_output_section_statement_type *os; |
| 140 | struct hook_stub_info info; |
| 141 | |
| 142 | /* PR 12845: If the input section has been garbage collected it will |
| 143 | not have its output section set to *ABS*. */ |
| 144 | if (bfd_is_abs_section (output_section)) |
| 145 | return NULL; |
| 146 | |
| 147 | /* Create the stub file, if we haven't already. */ |
| 148 | if (stub_file == NULL) |
| 149 | { |
| 150 | stub_file = lang_add_input_file ("linker stubs", |
| 151 | lang_input_file_is_fake_enum, |
| 152 | NULL); |
| 153 | stub_bfd = bfd_create ("linker stubs", link_info.output_bfd); |
| 154 | if (stub_bfd == NULL |
| 155 | || !bfd_set_arch_mach (stub_bfd, |
| 156 | bfd_get_arch (link_info.output_bfd), |
| 157 | bfd_get_mach (link_info.output_bfd))) |
| 158 | { |
| 159 | einfo ("%F%P: can not create BFD %E\n"); |
| 160 | return NULL; |
| 161 | } |
| 162 | stub_bfd->flags |= BFD_LINKER_CREATED; |
| 163 | stub_file->the_bfd = stub_bfd; |
| 164 | ldlang_add_file (stub_file); |
| 165 | } |
| 166 | |
| 167 | /* Create the section. */ |
| 168 | stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name); |
| 169 | if (stub_sec == NULL) |
| 170 | goto err_ret; |
| 171 | |
| 172 | /* Set the flags. */ |
| 173 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| 174 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP); |
| 175 | if (!bfd_set_section_flags (stub_bfd, stub_sec, flags)) |
| 176 | goto err_ret; |
| 177 | |
| 178 | os = lang_output_section_get (output_section); |
| 179 | |
| 180 | /* Initialize a statement list that contains only the new statement. */ |
| 181 | lang_list_init (&info.add); |
| 182 | lang_add_section (&info.add, stub_sec, NULL, os); |
| 183 | if (info.add.head == NULL) |
| 184 | goto err_ret; |
| 185 | |
| 186 | /* Insert the new statement in the appropriate place. */ |
| 187 | info.input_section = input_section; |
| 188 | if (hook_in_stub (&info, &os->children.head)) |
| 189 | return stub_sec; |
| 190 | |
| 191 | err_ret: |
| 192 | einfo ("%X%P: can not make stub section: %E\n"); |
| 193 | return NULL; |
| 194 | } |
| 195 | |
| 196 | /* This is called before the input files are opened. */ |
| 197 | |
| 198 | static void |
| 199 | mips_create_output_section_statements (void) |
| 200 | { |
| 201 | struct elf_link_hash_table *htab; |
| 202 | |
| 203 | htab = elf_hash_table (&link_info); |
| 204 | if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd)) |
| 205 | _bfd_mips_elf_insn32 (&link_info, insn32); |
| 206 | |
| 207 | if (is_mips_elf (link_info.output_bfd)) |
| 208 | _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section); |
| 209 | } |
| 210 | |
| 211 | /* This is called after we have merged the private data of the input bfds. */ |
| 212 | |
| 213 | static void |
| 214 | mips_before_allocation (void) |
| 215 | { |
| 216 | flagword flags; |
| 217 | |
| 218 | flags = elf_elfheader (link_info.output_bfd)->e_flags; |
| 219 | if (!bfd_link_pic (&link_info) |
| 220 | && !link_info.nocopyreloc |
| 221 | && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC) |
| 222 | _bfd_mips_elf_use_plts_and_copy_relocs (&link_info); |
| 223 | |
| 224 | gld${EMULATION_NAME}_before_allocation (); |
| 225 | } |
| 226 | |
| 227 | /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| 228 | check_needed routines. */ |
| 229 | |
| 230 | static void (*real_func) (lang_input_statement_type *); |
| 231 | |
| 232 | static void mips_for_each_input_file_wrapper (lang_input_statement_type *l) |
| 233 | { |
| 234 | if (l != stub_file) |
| 235 | (*real_func) (l); |
| 236 | } |
| 237 | |
| 238 | static void |
| 239 | mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) |
| 240 | { |
| 241 | real_func = func; |
| 242 | lang_for_each_input_file (&mips_for_each_input_file_wrapper); |
| 243 | } |
| 244 | |
| 245 | #define lang_for_each_input_file mips_lang_for_each_input_file |
| 246 | |
| 247 | EOF |
| 248 | |
| 249 | # Define some shell vars to insert bits of code into the standard elf |
| 250 | # parse_args and list_options functions. |
| 251 | # |
| 252 | PARSE_AND_LIST_PROLOGUE=' |
| 253 | enum |
| 254 | { |
| 255 | OPTION_INSN32 = 301, |
| 256 | OPTION_NO_INSN32 |
| 257 | }; |
| 258 | ' |
| 259 | |
| 260 | PARSE_AND_LIST_LONGOPTS=' |
| 261 | { "insn32", no_argument, NULL, OPTION_INSN32 }, |
| 262 | { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 }, |
| 263 | ' |
| 264 | |
| 265 | PARSE_AND_LIST_OPTIONS=' |
| 266 | fprintf (file, _("\ |
| 267 | --insn32 Only generate 32-bit microMIPS instructions\n" |
| 268 | )); |
| 269 | fprintf (file, _("\ |
| 270 | --no-insn32 Generate all microMIPS instructions\n" |
| 271 | )); |
| 272 | ' |
| 273 | |
| 274 | PARSE_AND_LIST_ARGS_CASES=' |
| 275 | case OPTION_INSN32: |
| 276 | insn32 = TRUE; |
| 277 | break; |
| 278 | |
| 279 | case OPTION_NO_INSN32: |
| 280 | insn32 = FALSE; |
| 281 | break; |
| 282 | ' |
| 283 | |
| 284 | LDEMUL_AFTER_PARSE=mips_after_parse |
| 285 | LDEMUL_BEFORE_ALLOCATION=mips_before_allocation |
| 286 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements |