1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2004-2019 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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.
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.
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,
34 #include "elfxx-mips.h"
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)
41 /* Fake input file for stubs. */
42 static lang_input_statement_type *stub_file;
45 static bfd_boolean insn32;
46 static bfd_boolean ignore_branch_isa;
47 static bfd_boolean compact_branches;
50 mips_after_parse (void)
52 /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
53 ways. .gnu.hash needs symbols to be grouped by hash code whereas the
54 MIPS ABI requires a mapping between the GOT and the symbol table. */
55 if (link_info.emit_gnu_hash)
57 einfo (_("%X%P: .gnu.hash is incompatible with the MIPS ABI\n"));
58 link_info.emit_hash = TRUE;
59 link_info.emit_gnu_hash = FALSE;
61 gld${EMULATION_NAME}_after_parse ();
66 lang_statement_list_type add;
67 asection *input_section;
70 /* Traverse the linker tree to find the spot where the stub goes. */
73 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
75 lang_statement_union_type *l;
78 for (; (l = *lp) != NULL; lp = &l->header.next)
80 switch (l->header.type)
82 case lang_constructors_statement_enum:
83 ret = hook_in_stub (info, &constructor_list.head);
88 case lang_output_section_statement_enum:
89 ret = hook_in_stub (info,
90 &l->output_section_statement.children.head);
95 case lang_wild_statement_enum:
96 ret = hook_in_stub (info, &l->wild_statement.children.head);
101 case lang_group_statement_enum:
102 ret = hook_in_stub (info, &l->group_statement.children.head);
107 case lang_input_section_enum:
108 if (info->input_section == NULL
109 || l->input_section.section == info->input_section)
111 /* We've found our section. Insert the stub immediately
112 before its associated input section. */
113 *lp = info->add.head;
114 *(info->add.tail) = l;
119 case lang_data_statement_enum:
120 case lang_reloc_statement_enum:
121 case lang_object_symbols_statement_enum:
122 case lang_output_statement_enum:
123 case lang_target_statement_enum:
124 case lang_input_statement_enum:
125 case lang_assignment_statement_enum:
126 case lang_padding_statement_enum:
127 case lang_address_statement_enum:
128 case lang_fill_statement_enum:
139 /* Create a new stub section called STUB_SEC_NAME and arrange for it to
140 be linked in OUTPUT_SECTION. The section should go at the beginning of
141 OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
142 before INPUT_SECTION. */
145 mips_add_stub_section (const char *stub_sec_name, asection *input_section,
146 asection *output_section)
150 lang_output_section_statement_type *os;
151 struct hook_stub_info info;
153 /* PR 12845: If the input section has been garbage collected it will
154 not have its output section set to *ABS*. */
155 if (bfd_is_abs_section (output_section))
158 /* Create the stub file, if we haven't already. */
159 if (stub_file == NULL)
161 stub_file = lang_add_input_file ("linker stubs",
162 lang_input_file_is_fake_enum,
164 stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
166 || !bfd_set_arch_mach (stub_bfd,
167 bfd_get_arch (link_info.output_bfd),
168 bfd_get_mach (link_info.output_bfd)))
170 einfo (_("%F%P: can not create BFD: %E\n"));
173 stub_bfd->flags |= BFD_LINKER_CREATED;
174 stub_file->the_bfd = stub_bfd;
175 ldlang_add_file (stub_file);
178 /* Create the section. */
179 stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
180 if (stub_sec == NULL)
184 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
185 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
186 if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
189 os = lang_output_section_get (output_section);
191 /* Initialize a statement list that contains only the new statement. */
192 lang_list_init (&info.add);
193 lang_add_section (&info.add, stub_sec, NULL, os);
194 if (info.add.head == NULL)
197 /* Insert the new statement in the appropriate place. */
198 info.input_section = input_section;
199 if (hook_in_stub (&info, &os->children.head))
203 einfo (_("%X%P: can not make stub section: %E\n"));
207 /* This is called before the input files are opened. */
210 mips_create_output_section_statements (void)
212 struct elf_link_hash_table *htab;
214 htab = elf_hash_table (&link_info);
215 if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd))
216 _bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa,
219 if (is_mips_elf (link_info.output_bfd))
221 _bfd_mips_elf_compact_branches (&link_info, compact_branches);
222 _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
226 /* This is called after we have merged the private data of the input bfds. */
229 mips_before_allocation (void)
231 if (is_mips_elf (link_info.output_bfd))
235 flags = elf_elfheader (link_info.output_bfd)->e_flags;
236 if (!bfd_link_pic (&link_info)
237 && !link_info.nocopyreloc
238 && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
239 _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
242 gld${EMULATION_NAME}_before_allocation ();
245 /* Avoid processing the fake stub_file in vercheck, stat_needed and
246 check_needed routines. */
248 static void (*real_func) (lang_input_statement_type *);
250 static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
257 mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
260 lang_for_each_input_file (&mips_for_each_input_file_wrapper);
263 #define lang_for_each_input_file mips_lang_for_each_input_file
267 # Define some shell vars to insert bits of code into the standard elf
268 # parse_args and list_options functions.
270 PARSE_AND_LIST_PROLOGUE='
275 OPTION_IGNORE_BRANCH_ISA,
276 OPTION_NO_IGNORE_BRANCH_ISA,
277 OPTION_COMPACT_BRANCHES,
278 OPTION_NO_COMPACT_BRANCHES
282 PARSE_AND_LIST_LONGOPTS='
283 { "insn32", no_argument, NULL, OPTION_INSN32 },
284 { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 },
285 { "ignore-branch-isa", no_argument, NULL, OPTION_IGNORE_BRANCH_ISA },
286 { "no-ignore-branch-isa", no_argument, NULL, OPTION_NO_IGNORE_BRANCH_ISA },
287 { "compact-branches", no_argument, NULL, OPTION_COMPACT_BRANCHES },
288 { "no-compact-branches", no_argument, NULL, OPTION_NO_COMPACT_BRANCHES },
291 PARSE_AND_LIST_OPTIONS='
293 --insn32 Only generate 32-bit microMIPS instructions\n"
296 --no-insn32 Generate all microMIPS instructions\n"
299 --ignore-branch-isa Accept invalid branch relocations requiring\n\
300 an ISA mode switch\n"
303 --no-ignore-branch-isa Reject invalid branch relocations requiring\n\
304 an ISA mode switch\n"
307 --compact-branches Generate compact branches/jumps for MIPS R6\n"
310 --no-compact-branches Generate delay slot branches/jumps for MIPS R6\n"
314 PARSE_AND_LIST_ARGS_CASES='
319 case OPTION_NO_INSN32:
323 case OPTION_IGNORE_BRANCH_ISA:
324 ignore_branch_isa = TRUE;
327 case OPTION_NO_IGNORE_BRANCH_ISA:
328 ignore_branch_isa = FALSE;
331 case OPTION_COMPACT_BRANCHES:
332 compact_branches = TRUE;
335 case OPTION_NO_COMPACT_BRANCHES:
336 compact_branches = FALSE;
340 LDEMUL_AFTER_PARSE=mips_after_parse
341 LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
342 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements