aboutsummaryrefslogtreecommitdiff
path: root/ld/emultempl/mipself.em
blob: 5d428d266f24cc490838eac29d5cdb62e23537dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2004-2018 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.

fragment <<EOF

#include "ldctor.h"
#include "elf/mips.h"
#include "elfxx-mips.h"

#define is_mips_elf(bfd)				\
  (bfd_get_flavour (bfd) == bfd_target_elf_flavour	\
   && elf_tdata (bfd) != NULL				\
   && elf_object_id (bfd) == MIPS_ELF_DATA)

/* Fake input file for stubs.  */
static lang_input_statement_type *stub_file;
static bfd *stub_bfd;

static bfd_boolean insn32;
static bfd_boolean ignore_branch_isa;

static void
mips_after_parse (void)
{
  /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
     ways.  .gnu.hash needs symbols to be grouped by hash code whereas the
     MIPS ABI requires a mapping between the GOT and the symbol table.  */
  if (link_info.emit_gnu_hash)
    {
      einfo (_("%X%P: .gnu.hash is incompatible with the MIPS ABI\n"));
      link_info.emit_hash = TRUE;
      link_info.emit_gnu_hash = FALSE;
    }
  gld${EMULATION_NAME}_after_parse ();
}

struct hook_stub_info
{
  lang_statement_list_type add;
  asection *input_section;
};

/* Traverse the linker tree to find the spot where the stub goes.  */

static bfd_boolean
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
{
  lang_statement_union_type *l;
  bfd_boolean ret;

  for (; (l = *lp) != NULL; lp = &l->header.next)
    {
      switch (l->header.type)
	{
	case lang_constructors_statement_enum:
	  ret = hook_in_stub (info, &constructor_list.head);
	  if (ret)
	    return ret;
	  break;

	case lang_output_section_statement_enum:
	  ret = hook_in_stub (info,
			      &l->output_section_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_wild_statement_enum:
	  ret = hook_in_stub (info, &l->wild_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_group_statement_enum:
	  ret = hook_in_stub (info, &l->group_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_input_section_enum:
	  if (info->input_section == NULL
	      || l->input_section.section == info->input_section)
	    {
	      /* We've found our section.  Insert the stub immediately
		 before its associated input section.  */
	      *lp = info->add.head;
	      *(info->add.tail) = l;
	      return TRUE;
	    }
	  break;

	case lang_data_statement_enum:
	case lang_reloc_statement_enum:
	case lang_object_symbols_statement_enum:
	case lang_output_statement_enum:
	case lang_target_statement_enum:
	case lang_input_statement_enum:
	case lang_assignment_statement_enum:
	case lang_padding_statement_enum:
	case lang_address_statement_enum:
	case lang_fill_statement_enum:
	  break;

	default:
	  FAIL ();
	  break;
	}
    }
  return FALSE;
}

/* Create a new stub section called STUB_SEC_NAME and arrange for it to
   be linked in OUTPUT_SECTION.  The section should go at the beginning of
   OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
   before INPUT_SECTION.  */

static asection *
mips_add_stub_section (const char *stub_sec_name, asection *input_section,
		       asection *output_section)
{
  asection *stub_sec;
  flagword flags;
  lang_output_section_statement_type *os;
  struct hook_stub_info info;

  /* PR 12845: If the input section has been garbage collected it will
     not have its output section set to *ABS*.  */
  if (bfd_is_abs_section (output_section))
    return NULL;

  /* Create the stub file, if we haven't already.  */
  if (stub_file == NULL)
    {
      stub_file = lang_add_input_file ("linker stubs",
				       lang_input_file_is_fake_enum,
				       NULL);
      stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
      if (stub_bfd == NULL
	  || !bfd_set_arch_mach (stub_bfd,
				 bfd_get_arch (link_info.output_bfd),
				 bfd_get_mach (link_info.output_bfd)))
	{
	  einfo (_("%F%P: can not create BFD %E\n"));
	  return NULL;
	}
      stub_bfd->flags |= BFD_LINKER_CREATED;
      stub_file->the_bfd = stub_bfd;
      ldlang_add_file (stub_file);
    }

  /* Create the section.  */
  stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
  if (stub_sec == NULL)
    goto err_ret;

  /* Set the flags.  */
  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
	   | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
  if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
    goto err_ret;

  os = lang_output_section_get (output_section);

  /* Initialize a statement list that contains only the new statement.  */
  lang_list_init (&info.add);
  lang_add_section (&info.add, stub_sec, NULL, os);
  if (info.add.head == NULL)
    goto err_ret;

  /* Insert the new statement in the appropriate place.  */
  info.input_section = input_section;
  if (hook_in_stub (&info, &os->children.head))
    return stub_sec;

 err_ret:
  einfo (_("%X%P: can not make stub section: %E\n"));
  return NULL;
}

/* This is called before the input files are opened.  */

static void
mips_create_output_section_statements (void)
{
  struct elf_link_hash_table *htab;

  htab = elf_hash_table (&link_info);
  if (is_elf_hash_table (htab) && is_mips_elf (link_info.output_bfd))
    _bfd_mips_elf_linker_flags (&link_info, insn32, ignore_branch_isa);

  if (is_mips_elf (link_info.output_bfd))
    _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
}

/* This is called after we have merged the private data of the input bfds.  */

static void
mips_before_allocation (void)
{
  if (is_mips_elf (link_info.output_bfd))
    {
      flagword flags;

      flags = elf_elfheader (link_info.output_bfd)->e_flags;
      if (!bfd_link_pic (&link_info)
	  && !link_info.nocopyreloc
	  && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
	_bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
    }

  gld${EMULATION_NAME}_before_allocation ();
}

/* Avoid processing the fake stub_file in vercheck, stat_needed and
   check_needed routines.  */

static void (*real_func) (lang_input_statement_type *);

static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
{
  if (l != stub_file)
    (*real_func) (l);
}

static void
mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
{
  real_func = func;
  lang_for_each_input_file (&mips_for_each_input_file_wrapper);
}

#define lang_for_each_input_file mips_lang_for_each_input_file

EOF

# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE='
enum
  {
    OPTION_INSN32 = 301,
    OPTION_NO_INSN32,
    OPTION_IGNORE_BRANCH_ISA,
    OPTION_NO_IGNORE_BRANCH_ISA
  };
'

PARSE_AND_LIST_LONGOPTS='
  { "insn32", no_argument, NULL, OPTION_INSN32 },
  { "no-insn32", no_argument, NULL, OPTION_NO_INSN32 },
  { "ignore-branch-isa", no_argument, NULL, OPTION_IGNORE_BRANCH_ISA },
  { "no-ignore-branch-isa", no_argument, NULL, OPTION_NO_IGNORE_BRANCH_ISA },
'

PARSE_AND_LIST_OPTIONS='
  fprintf (file, _("\
  --insn32                    Only generate 32-bit microMIPS instructions\n"
		   ));
  fprintf (file, _("\
  --no-insn32                 Generate all microMIPS instructions\n"
		   ));
  fprintf (file, _("\
  --ignore-branch-isa         Accept invalid branch relocations requiring\n\
                              an ISA mode switch\n"
		   ));
  fprintf (file, _("\
  --no-ignore-branch-isa      Reject invalid branch relocations requiring\n\
                              an ISA mode switch\n"
		   ));
'

PARSE_AND_LIST_ARGS_CASES='
    case OPTION_INSN32:
      insn32 = TRUE;
      break;

    case OPTION_NO_INSN32:
      insn32 = FALSE;
      break;

    case OPTION_IGNORE_BRANCH_ISA:
      ignore_branch_isa = TRUE;
      break;

    case OPTION_NO_IGNORE_BRANCH_ISA:
      ignore_branch_isa = FALSE;
      break;
'

LDEMUL_AFTER_PARSE=mips_after_parse
LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements