1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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,
19 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
32 #include "opcode/i386.h"
34 /* 386 uses REL relocations instead of RELA. */
39 static reloc_howto_type elf_howto_table
[]=
41 HOWTO(R_386_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
42 bfd_elf_generic_reloc
, "R_386_NONE",
43 TRUE
, 0x00000000, 0x00000000, FALSE
),
44 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
45 bfd_elf_generic_reloc
, "R_386_32",
46 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
47 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
48 bfd_elf_generic_reloc
, "R_386_PC32",
49 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
50 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
51 bfd_elf_generic_reloc
, "R_386_GOT32",
52 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
53 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
54 bfd_elf_generic_reloc
, "R_386_PLT32",
55 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
56 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
57 bfd_elf_generic_reloc
, "R_386_COPY",
58 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
59 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
60 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
61 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
62 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
63 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
64 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
65 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
66 bfd_elf_generic_reloc
, "R_386_RELATIVE",
67 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
68 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
69 bfd_elf_generic_reloc
, "R_386_GOTOFF",
70 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
71 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
72 bfd_elf_generic_reloc
, "R_386_GOTPC",
73 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
84 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
85 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
86 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_386_TLS_IE",
88 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
89 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
90 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
91 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
92 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
93 bfd_elf_generic_reloc
, "R_386_TLS_LE",
94 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
95 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_386_TLS_GD",
97 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
98 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
100 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
101 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_386_16",
103 TRUE
, 0xffff, 0xffff, FALSE
),
104 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
105 bfd_elf_generic_reloc
, "R_386_PC16",
106 TRUE
, 0xffff, 0xffff, TRUE
),
107 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
108 bfd_elf_generic_reloc
, "R_386_8",
109 TRUE
, 0xff, 0xff, FALSE
),
110 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
111 bfd_elf_generic_reloc
, "R_386_PC8",
112 TRUE
, 0xff, 0xff, TRUE
),
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
118 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
119 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
120 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
121 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
122 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
123 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
124 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
125 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
126 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
127 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
128 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
129 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
130 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
131 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
132 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
133 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
134 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
135 HOWTO(R_386_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
136 bfd_elf_generic_reloc
, "R_386_SIZE32",
137 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
138 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
139 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
140 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
141 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
142 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
144 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
145 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
146 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
147 HOWTO(R_386_IRELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
148 bfd_elf_generic_reloc
, "R_386_IRELATIVE",
149 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
150 HOWTO(R_386_GOT32X
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
151 bfd_elf_generic_reloc
, "R_386_GOT32X",
152 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT
, /* type */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
163 FALSE
, /* pc_relative */
165 complain_overflow_dont
, /* complain_on_overflow */
166 NULL
, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE
, /* partial_inplace */
171 FALSE
), /* pcrel_offset */
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY
, /* type */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
178 FALSE
, /* pc_relative */
180 complain_overflow_dont
, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE
, /* partial_inplace */
186 FALSE
) /* pcrel_offset */
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
192 #ifdef DEBUG_GEN_RELOC
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
199 static reloc_howto_type
*
200 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
201 bfd_reloc_code_real_type code
)
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table
[R_386_NONE
];
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table
[R_386_32
];
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table
[R_386_32
];
217 case BFD_RELOC_32_PCREL
:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table
[R_386_PC32
];
221 case BFD_RELOC_386_GOT32
:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table
[R_386_GOT32
];
225 case BFD_RELOC_386_PLT32
:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table
[R_386_PLT32
];
229 case BFD_RELOC_386_COPY
:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table
[R_386_COPY
];
233 case BFD_RELOC_386_GLOB_DAT
:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table
[R_386_GLOB_DAT
];
237 case BFD_RELOC_386_JUMP_SLOT
:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table
[R_386_JUMP_SLOT
];
241 case BFD_RELOC_386_RELATIVE
:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table
[R_386_RELATIVE
];
245 case BFD_RELOC_386_GOTOFF
:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table
[R_386_GOTOFF
];
249 case BFD_RELOC_386_GOTPC
:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table
[R_386_GOTPC
];
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF
:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
258 case BFD_RELOC_386_TLS_IE
:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
262 case BFD_RELOC_386_TLS_GOTIE
:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
266 case BFD_RELOC_386_TLS_LE
:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
270 case BFD_RELOC_386_TLS_GD
:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
274 case BFD_RELOC_386_TLS_LDM
:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
282 case BFD_RELOC_16_PCREL
:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
290 case BFD_RELOC_8_PCREL
:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32
:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
299 case BFD_RELOC_386_TLS_IE_32
:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
303 case BFD_RELOC_386_TLS_LE_32
:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
307 case BFD_RELOC_386_TLS_DTPMOD32
:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
311 case BFD_RELOC_386_TLS_DTPOFF32
:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
315 case BFD_RELOC_386_TLS_TPOFF32
:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
319 case BFD_RELOC_SIZE32
:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table
[R_386_SIZE32
- R_386_tls_offset
];
323 case BFD_RELOC_386_TLS_GOTDESC
:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
327 case BFD_RELOC_386_TLS_DESC_CALL
:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
331 case BFD_RELOC_386_TLS_DESC
:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
335 case BFD_RELOC_386_IRELATIVE
:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table
[R_386_IRELATIVE
- R_386_tls_offset
];
339 case BFD_RELOC_386_GOT32X
:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table
[R_386_GOT32X
- R_386_tls_offset
];
343 case BFD_RELOC_VTABLE_INHERIT
:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
347 case BFD_RELOC_VTABLE_ENTRY
:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
359 static reloc_howto_type
*
360 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
365 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
366 if (elf_howto_table
[i
].name
!= NULL
367 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
368 return &elf_howto_table
[i
];
373 static reloc_howto_type
*
374 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
378 if ((indx
= r_type
) >= R_386_standard
379 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
380 >= R_386_ext
- R_386_standard
)
381 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
382 >= R_386_ext2
- R_386_ext
)
383 && ((indx
= r_type
- R_386_vt_offset
) - R_386_ext2
384 >= R_386_vt
- R_386_ext2
))
386 /* xgettext:c-format */
387 _bfd_error_handler (_("%B: invalid relocation type %d"),
391 /* PR 17512: file: 0f67f69d. */
392 if (elf_howto_table
[indx
].type
!= r_type
)
394 return &elf_howto_table
[indx
];
398 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
400 Elf_Internal_Rela
*dst
)
402 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
403 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
406 /* Return whether a symbol name implies a local label. The UnixWare
407 2.1 cc generates temporary symbols that start with .X, so we
408 recognize them here. FIXME: do other SVR4 compilers also use .X?.
409 If so, we should move the .X recognition into
410 _bfd_elf_is_local_label_name. */
413 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
415 if (name
[0] == '.' && name
[1] == 'X')
418 return _bfd_elf_is_local_label_name (abfd
, name
);
421 /* Support for core dump NOTE sections. */
424 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
429 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
431 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
437 elf_tdata (abfd
)->core
->signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
440 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
444 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
448 switch (note
->descsz
)
453 case 144: /* Linux/i386 */
455 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
458 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
468 /* Make a ".reg/999" section. */
469 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
470 size
, note
->descpos
+ offset
);
474 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
476 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
478 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
483 elf_tdata (abfd
)->core
->program
484 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
485 elf_tdata (abfd
)->core
->command
486 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
490 switch (note
->descsz
)
495 case 124: /* Linux/i386 elf_prpsinfo. */
496 elf_tdata (abfd
)->core
->pid
497 = bfd_get_32 (abfd
, note
->descdata
+ 12);
498 elf_tdata (abfd
)->core
->program
499 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
500 elf_tdata (abfd
)->core
->command
501 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
505 /* Note that for some reason, a spurious space is tacked
506 onto the end of the args in some (at least one anyway)
507 implementations, so strip it off if it exists. */
509 char *command
= elf_tdata (abfd
)->core
->command
;
510 int n
= strlen (command
);
512 if (0 < n
&& command
[n
- 1] == ' ')
513 command
[n
- 1] = '\0';
519 /* Functions for the i386 ELF linker.
521 In order to gain some understanding of code in this file without
522 knowing all the intricate details of the linker, note the
525 Functions named elf_i386_* are called by external routines, other
526 functions are only called locally. elf_i386_* functions appear
527 in this file more or less in the order in which they are called
528 from external routines. eg. elf_i386_check_relocs is called
529 early in the link process, elf_i386_finish_dynamic_sections is
530 one of the last functions. */
533 /* The name of the dynamic interpreter. This is put in the .interp
536 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
538 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
539 copying dynamic variables from a shared lib into an app's dynbss
540 section, and instead use a dynamic relocation to point into the
542 #define ELIMINATE_COPY_RELOCS 1
544 /* The size in bytes of an entry in the lazy procedure linkage table. */
546 #define LAZY_PLT_ENTRY_SIZE 16
548 /* The size in bytes of an entry in the non-lazy procedure linkage
551 #define NON_LAZY_PLT_ENTRY_SIZE 8
553 /* The first entry in an absolute lazy procedure linkage table looks
554 like this. See the SVR4 ABI i386 supplement to see how this works.
555 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
557 static const bfd_byte elf_i386_lazy_plt0_entry
[12] =
559 0xff, 0x35, /* pushl contents of address */
560 0, 0, 0, 0, /* replaced with address of .got + 4. */
561 0xff, 0x25, /* jmp indirect */
562 0, 0, 0, 0 /* replaced with address of .got + 8. */
565 /* Subsequent entries in an absolute lazy procedure linkage table look
568 static const bfd_byte elf_i386_lazy_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
570 0xff, 0x25, /* jmp indirect */
571 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
572 0x68, /* pushl immediate */
573 0, 0, 0, 0, /* replaced with offset into relocation table. */
574 0xe9, /* jmp relative */
575 0, 0, 0, 0 /* replaced with offset to start of .plt. */
578 /* The first entry in a PIC lazy procedure linkage table look like
579 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
580 lazy_plt->plt0_pad_byte. */
582 static const bfd_byte elf_i386_pic_lazy_plt0_entry
[12] =
584 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
585 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
588 /* Subsequent entries in a PIC lazy procedure linkage table look like
591 static const bfd_byte elf_i386_pic_lazy_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
593 0xff, 0xa3, /* jmp *offset(%ebx) */
594 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
595 0x68, /* pushl immediate */
596 0, 0, 0, 0, /* replaced with offset into relocation table. */
597 0xe9, /* jmp relative */
598 0, 0, 0, 0 /* replaced with offset to start of .plt. */
601 /* Entries in the non-lazy procedure linkage table look like this. */
603 static const bfd_byte elf_i386_non_lazy_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
605 0xff, 0x25, /* jmp indirect */
606 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
607 0x66, 0x90 /* xchg %ax,%ax */
610 /* Entries in the PIC non-lazy procedure linkage table look like
613 static const bfd_byte elf_i386_pic_non_lazy_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
615 0xff, 0xa3, /* jmp *offset(%ebx) */
616 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
617 0x66, 0x90 /* xchg %ax,%ax */
620 /* The first entry in an absolute IBT-enabled lazy procedure linkage
621 table looks like this. */
623 static const bfd_byte elf_i386_lazy_ibt_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
625 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
626 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
627 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
630 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
631 table look like this. Subsequent entries for a PIC IBT-enabled lazy
632 procedure linkage table are the same. */
634 static const bfd_byte elf_i386_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
636 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
637 0x68, 0, 0, 0, 0, /* pushl immediate */
638 0xe9, 0, 0, 0, 0, /* jmp relative */
639 0x66, 0x90 /* xchg %ax,%ax */
642 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
645 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
647 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
648 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
649 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
652 /* Entries for branches with IBT-enabled in the absolute non-lazey
653 procedure linkage table look like this. They have the same size
654 as the lazy PLT entry. */
656 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
658 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
659 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
660 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
663 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
664 linkage table look like this. They have the same size as the lazy
667 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
669 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
670 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
671 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
674 /* .eh_frame covering the lazy .plt section. */
676 static const bfd_byte elf_i386_eh_frame_lazy_plt
[] =
678 #define PLT_CIE_LENGTH 20
679 #define PLT_FDE_LENGTH 36
680 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
681 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
682 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
683 0, 0, 0, 0, /* CIE ID */
685 'z', 'R', 0, /* Augmentation string */
686 1, /* Code alignment factor */
687 0x7c, /* Data alignment factor */
688 8, /* Return address column */
689 1, /* Augmentation size */
690 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
691 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
692 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
693 DW_CFA_nop
, DW_CFA_nop
,
695 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
696 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
697 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
698 0, 0, 0, 0, /* .plt size goes here */
699 0, /* Augmentation size */
700 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
701 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
702 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
703 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
704 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
705 11, /* Block length */
706 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
707 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
708 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
709 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
710 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
713 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
715 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt
[] =
717 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
718 0, 0, 0, 0, /* CIE ID */
720 'z', 'R', 0, /* Augmentation string */
721 1, /* Code alignment factor */
722 0x7c, /* Data alignment factor */
723 8, /* Return address column */
724 1, /* Augmentation size */
725 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
726 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
727 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
728 DW_CFA_nop
, DW_CFA_nop
,
730 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
731 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
732 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
733 0, 0, 0, 0, /* .plt size goes here */
734 0, /* Augmentation size */
735 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
736 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
737 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
738 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
739 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
740 11, /* Block length */
741 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
742 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
743 DW_OP_lit15
, DW_OP_and
, DW_OP_lit9
, DW_OP_ge
,
744 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
745 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
748 /* .eh_frame covering the non-lazy .plt section. */
750 static const bfd_byte elf_i386_eh_frame_non_lazy_plt
[] =
752 #define PLT_GOT_FDE_LENGTH 16
753 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
754 0, 0, 0, 0, /* CIE ID */
756 'z', 'R', 0, /* Augmentation string */
757 1, /* Code alignment factor */
758 0x7c, /* Data alignment factor */
759 8, /* Return address column */
760 1, /* Augmentation size */
761 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
762 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
763 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
764 DW_CFA_nop
, DW_CFA_nop
,
766 PLT_GOT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
767 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
768 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
769 0, 0, 0, 0, /* non-lazy .plt size goes here */
770 0, /* Augmentation size */
771 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
774 struct elf_i386_lazy_plt_layout
776 /* The first entry in an absolute lazy procedure linkage table looks
778 const bfd_byte
*plt0_entry
;
779 unsigned int plt0_entry_size
;
781 /* Offsets into plt0_entry that are to be replaced with GOT[1] and
783 unsigned int plt0_got1_offset
;
784 unsigned int plt0_got2_offset
;
786 /* Later entries in an absolute lazy procedure linkage table look
788 const bfd_byte
*plt_entry
;
789 unsigned int plt_entry_size
;
791 /* Offsets into plt_entry that are to be replaced with... */
792 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
793 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
794 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
796 /* Offset into plt_entry where the initial value of the GOT entry
798 unsigned int plt_lazy_offset
;
800 /* The first entry in a PIC lazy procedure linkage table looks like
802 const bfd_byte
*pic_plt0_entry
;
804 /* Subsequent entries in a PIC lazy procedure linkage table look
806 const bfd_byte
*pic_plt_entry
;
808 /* .eh_frame covering the lazy .plt section. */
809 const bfd_byte
*eh_frame_plt
;
810 unsigned int eh_frame_plt_size
;
813 struct elf_i386_non_lazy_plt_layout
815 /* Entries in an absolute non-lazy procedure linkage table look like
817 const bfd_byte
*plt_entry
;
818 /* Entries in a PIC non-lazy procedure linkage table look like this. */
819 const bfd_byte
*pic_plt_entry
;
821 unsigned int plt_entry_size
;
823 /* Offsets into plt_entry that are to be replaced with... */
824 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
826 /* .eh_frame covering the non-lazy .plt section. */
827 const bfd_byte
*eh_frame_plt
;
828 unsigned int eh_frame_plt_size
;
831 struct elf_i386_plt_layout
833 /* The first entry in a lazy procedure linkage table looks like this. */
834 const bfd_byte
*plt0_entry
;
835 /* Entries in a procedure linkage table look like this. */
836 const bfd_byte
*plt_entry
;
837 unsigned int plt_entry_size
;
840 unsigned int has_plt0
;
842 /* Offsets into plt_entry that are to be replaced with... */
843 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
845 /* .eh_frame covering the .plt section. */
846 const bfd_byte
*eh_frame_plt
;
847 unsigned int eh_frame_plt_size
;
850 /* These are the standard parameters. */
851 static const struct elf_i386_lazy_plt_layout elf_i386_lazy_plt
=
853 elf_i386_lazy_plt0_entry
, /* plt0_entry */
854 sizeof (elf_i386_lazy_plt0_entry
), /* plt0_entry_size */
855 2, /* plt0_got1_offset */
856 8, /* plt0_got2_offset */
857 elf_i386_lazy_plt_entry
, /* plt_entry */
858 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
859 2, /* plt_got_offset */
860 7, /* plt_reloc_offset */
861 12, /* plt_plt_offset */
862 6, /* plt_lazy_offset */
863 elf_i386_pic_lazy_plt0_entry
, /* pic_plt0_entry */
864 elf_i386_pic_lazy_plt_entry
, /* pic_plt_entry */
865 elf_i386_eh_frame_lazy_plt
, /* eh_frame_plt */
866 sizeof (elf_i386_eh_frame_lazy_plt
) /* eh_frame_plt_size */
869 static const struct elf_i386_non_lazy_plt_layout elf_i386_non_lazy_plt
=
871 elf_i386_non_lazy_plt_entry
, /* plt_entry */
872 elf_i386_pic_non_lazy_plt_entry
, /* pic_plt_entry */
873 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
874 2, /* plt_got_offset */
875 elf_i386_eh_frame_non_lazy_plt
, /* eh_frame_plt */
876 sizeof (elf_i386_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
879 static const struct elf_i386_lazy_plt_layout elf_i386_lazy_ibt_plt
=
881 elf_i386_lazy_ibt_plt0_entry
, /* plt0_entry */
882 sizeof (elf_i386_lazy_ibt_plt0_entry
), /* plt0_entry_size */
883 2, /* plt0_got1_offset */
884 8, /* plt0_got2_offset */
885 elf_i386_lazy_ibt_plt_entry
, /* plt_entry */
886 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
887 4+2, /* plt_got_offset */
888 4+1, /* plt_reloc_offset */
889 4+6, /* plt_plt_offset */
890 0, /* plt_lazy_offset */
891 elf_i386_pic_lazy_ibt_plt0_entry
, /* pic_plt0_entry */
892 elf_i386_lazy_ibt_plt_entry
, /* pic_plt_entry */
893 elf_i386_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
894 sizeof (elf_i386_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
897 static const struct elf_i386_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt
=
899 elf_i386_non_lazy_ibt_plt_entry
, /* plt_entry */
900 elf_i386_pic_non_lazy_ibt_plt_entry
,/* pic_plt_entry */
901 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
902 4+2, /* plt_got_offset */
903 elf_i386_eh_frame_non_lazy_plt
, /* eh_frame_plt */
904 sizeof (elf_i386_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
908 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
909 for the PLTResolve stub and then for each PLT entry. */
910 #define PLTRESOLVE_RELOCS_SHLIB 0
911 #define PLTRESOLVE_RELOCS 2
912 #define PLT_NON_JUMP_SLOT_RELOCS 2
914 /* Architecture-specific backend data for i386. */
916 struct elf_i386_backend_data
918 /* Value used to fill the unused bytes of the first PLT entry. */
919 bfd_byte plt0_pad_byte
;
930 #define get_elf_i386_backend_data(abfd) \
931 ((const struct elf_i386_backend_data *) \
932 get_elf_backend_data (abfd)->arch_data)
934 /* These are the standard parameters. */
935 static const struct elf_i386_backend_data elf_i386_arch_bed
=
937 0, /* plt0_pad_byte */
941 #define elf_backend_arch_data &elf_i386_arch_bed
943 /* Is a undefined weak symbol which is resolved to 0. Reference to an
944 undefined weak symbol is resolved to 0 when building executable if
946 1. Has non-GOT/non-PLT relocations in text section. Or
947 2. Has no GOT/PLT relocation.
948 Local undefined weak symbol is always resolved to 0.
950 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
951 ((EH)->elf.root.type == bfd_link_hash_undefweak \
952 && ((EH)->elf.forced_local \
953 || (bfd_link_executable (INFO) \
954 && (elf_i386_hash_table (INFO)->interp == NULL \
956 || (EH)->has_non_got_reloc \
957 || !(INFO)->dynamic_undefined_weak))))
959 /* Should copy relocation be generated for a symbol. Don't generate
960 copy relocation against a protected symbol defined in a shared
961 object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */
962 #define SYMBOL_NO_COPYRELOC(INFO, EH) \
963 ((EH)->def_protected \
964 && ((EH)->elf.root.type == bfd_link_hash_defined \
965 || (EH)->elf.root.type == bfd_link_hash_defweak) \
966 && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
967 && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
968 && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
971 /* i386 ELF linker hash entry. */
973 struct elf_i386_link_hash_entry
975 struct elf_link_hash_entry elf
;
977 /* Track dynamic relocs copied for this symbol. */
978 struct elf_dyn_relocs
*dyn_relocs
;
980 #define GOT_UNKNOWN 0
984 #define GOT_TLS_IE_POS 5
985 #define GOT_TLS_IE_NEG 6
986 #define GOT_TLS_IE_BOTH 7
987 #define GOT_TLS_GDESC 8
988 #define GOT_TLS_GD_BOTH_P(type) \
989 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
990 #define GOT_TLS_GD_P(type) \
991 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
992 #define GOT_TLS_GDESC_P(type) \
993 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
994 #define GOT_TLS_GD_ANY_P(type) \
995 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
996 unsigned char tls_type
;
998 /* Symbol is referenced by R_386_GOTOFF relocation. */
999 unsigned int gotoff_ref
: 1;
1001 /* Symbol has GOT or PLT relocations. */
1002 unsigned int has_got_reloc
: 1;
1004 /* Symbol has non-GOT/non-PLT relocations in text sections. */
1005 unsigned int has_non_got_reloc
: 1;
1007 /* Don't call finish_dynamic_symbol on this symbol. */
1008 unsigned int no_finish_dynamic_symbol
: 1;
1010 /* TRUE if symbol is __tls_get_addr. */
1011 unsigned int tls_get_addr
: 1;
1013 /* TRUE if symbol is defined as a protected symbol. */
1014 unsigned int def_protected
: 1;
1016 /* Reference count of C/C++ function pointer relocations in read-write
1017 section which can be resolved at run-time. */
1018 bfd_signed_vma func_pointer_refcount
;
1020 /* Information about the GOT PLT entry. Filled when there are both
1021 GOT and PLT relocations against the same function. */
1022 union gotplt_union plt_got
;
1024 /* Information about the second PLT entry. */
1025 union gotplt_union plt_second
;
1027 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
1028 starting at the end of the jump table. */
1029 bfd_vma tlsdesc_got
;
1032 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
1034 struct elf_i386_obj_tdata
1036 struct elf_obj_tdata root
;
1038 /* tls_type for each local got entry. */
1039 char *local_got_tls_type
;
1041 /* GOTPLT entries for TLS descriptors. */
1042 bfd_vma
*local_tlsdesc_gotent
;
1045 #define elf_i386_tdata(abfd) \
1046 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
1048 #define elf_i386_local_got_tls_type(abfd) \
1049 (elf_i386_tdata (abfd)->local_got_tls_type)
1051 #define elf_i386_local_tlsdesc_gotent(abfd) \
1052 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
1054 #define is_i386_elf(bfd) \
1055 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1056 && elf_tdata (bfd) != NULL \
1057 && elf_object_id (bfd) == I386_ELF_DATA)
1060 elf_i386_mkobject (bfd
*abfd
)
1062 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_i386_obj_tdata
),
1066 /* i386 ELF linker hash table. */
1068 struct elf_i386_link_hash_table
1070 struct elf_link_hash_table elf
;
1072 /* Short-cuts to get to dynamic linker sections. */
1074 asection
*plt_eh_frame
;
1075 asection
*plt_second
;
1076 asection
*plt_second_eh_frame
;
1078 asection
*plt_got_eh_frame
;
1080 /* Parameters describing PLT generation. */
1081 struct elf_i386_plt_layout plt
;
1083 /* Parameters describing lazy PLT generation. */
1084 const struct elf_i386_lazy_plt_layout
*lazy_plt
;
1086 /* Parameters describing non-lazy PLT generation. */
1087 const struct elf_i386_non_lazy_plt_layout
*non_lazy_plt
;
1091 bfd_signed_vma refcount
;
1095 /* The amount of space used by the reserved portion of the sgotplt
1096 section, plus whatever space is used by the jump slots. */
1097 bfd_vma sgotplt_jump_table_size
;
1099 /* Small local sym cache. */
1100 struct sym_cache sym_cache
;
1102 /* _TLS_MODULE_BASE_ symbol. */
1103 struct bfd_link_hash_entry
*tls_module_base
;
1105 /* Used by local STT_GNU_IFUNC symbols. */
1106 htab_t loc_hash_table
;
1107 void * loc_hash_memory
;
1109 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
1112 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
1113 bfd_vma next_tls_desc_index
;
1115 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
1116 bfd_vma next_jump_slot_index
;
1118 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
1119 bfd_vma next_irelative_index
;
1121 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
1122 to read-only sections. */
1123 bfd_boolean readonly_dynrelocs_against_ifunc
;
1126 /* Get the i386 ELF linker hash table from a link_info structure. */
1128 #define elf_i386_hash_table(p) \
1129 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1130 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
1132 #define elf_i386_compute_jump_table_size(htab) \
1133 ((htab)->elf.srelplt->reloc_count * 4)
1135 /* Create an entry in an i386 ELF linker hash table. */
1137 static struct bfd_hash_entry
*
1138 elf_i386_link_hash_newfunc (struct bfd_hash_entry
*entry
,
1139 struct bfd_hash_table
*table
,
1142 /* Allocate the structure if it has not already been allocated by a
1146 entry
= (struct bfd_hash_entry
*)
1147 bfd_hash_allocate (table
, sizeof (struct elf_i386_link_hash_entry
));
1152 /* Call the allocation method of the superclass. */
1153 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
1156 struct elf_i386_link_hash_entry
*eh
;
1158 eh
= (struct elf_i386_link_hash_entry
*) entry
;
1159 eh
->dyn_relocs
= NULL
;
1160 eh
->tls_type
= GOT_UNKNOWN
;
1162 eh
->has_got_reloc
= 0;
1163 eh
->has_non_got_reloc
= 0;
1164 eh
->no_finish_dynamic_symbol
= 0;
1165 eh
->tls_get_addr
= 0;
1166 eh
->def_protected
= 0;
1167 eh
->func_pointer_refcount
= 0;
1168 eh
->plt_got
.offset
= (bfd_vma
) -1;
1169 eh
->tlsdesc_got
= (bfd_vma
) -1;
1175 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1176 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1177 as global symbol. We reuse indx and dynstr_index for local symbol
1178 hash since they aren't used by global symbols in this backend. */
1181 elf_i386_local_htab_hash (const void *ptr
)
1183 struct elf_link_hash_entry
*h
1184 = (struct elf_link_hash_entry
*) ptr
;
1185 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
1188 /* Compare local hash entries. */
1191 elf_i386_local_htab_eq (const void *ptr1
, const void *ptr2
)
1193 struct elf_link_hash_entry
*h1
1194 = (struct elf_link_hash_entry
*) ptr1
;
1195 struct elf_link_hash_entry
*h2
1196 = (struct elf_link_hash_entry
*) ptr2
;
1198 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
1201 /* Find and/or create a hash entry for local symbol. */
1203 static struct elf_link_hash_entry
*
1204 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table
*htab
,
1205 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
1208 struct elf_i386_link_hash_entry e
, *ret
;
1209 asection
*sec
= abfd
->sections
;
1210 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
1211 ELF32_R_SYM (rel
->r_info
));
1214 e
.elf
.indx
= sec
->id
;
1215 e
.elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
1216 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
1217 create
? INSERT
: NO_INSERT
);
1224 ret
= (struct elf_i386_link_hash_entry
*) *slot
;
1228 ret
= (struct elf_i386_link_hash_entry
*)
1229 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
1230 sizeof (struct elf_i386_link_hash_entry
));
1233 memset (ret
, 0, sizeof (*ret
));
1234 ret
->elf
.indx
= sec
->id
;
1235 ret
->elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
1236 ret
->elf
.dynindx
= -1;
1237 ret
->func_pointer_refcount
= 0;
1238 ret
->plt_got
.offset
= (bfd_vma
) -1;
1244 /* Destroy an i386 ELF linker hash table. */
1247 elf_i386_link_hash_table_free (bfd
*obfd
)
1249 struct elf_i386_link_hash_table
*htab
1250 = (struct elf_i386_link_hash_table
*) obfd
->link
.hash
;
1252 if (htab
->loc_hash_table
)
1253 htab_delete (htab
->loc_hash_table
);
1254 if (htab
->loc_hash_memory
)
1255 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1256 _bfd_elf_link_hash_table_free (obfd
);
1259 /* Create an i386 ELF linker hash table. */
1261 static struct bfd_link_hash_table
*
1262 elf_i386_link_hash_table_create (bfd
*abfd
)
1264 struct elf_i386_link_hash_table
*ret
;
1265 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
1267 ret
= (struct elf_i386_link_hash_table
*) bfd_zmalloc (amt
);
1271 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1272 elf_i386_link_hash_newfunc
,
1273 sizeof (struct elf_i386_link_hash_entry
),
1280 ret
->loc_hash_table
= htab_try_create (1024,
1281 elf_i386_local_htab_hash
,
1282 elf_i386_local_htab_eq
,
1284 ret
->loc_hash_memory
= objalloc_create ();
1285 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1287 elf_i386_link_hash_table_free (abfd
);
1290 ret
->elf
.root
.hash_table_free
= elf_i386_link_hash_table_free
;
1292 return &ret
->elf
.root
;
1295 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1298 elf_i386_copy_indirect_symbol (struct bfd_link_info
*info
,
1299 struct elf_link_hash_entry
*dir
,
1300 struct elf_link_hash_entry
*ind
)
1302 struct elf_i386_link_hash_entry
*edir
, *eind
;
1304 edir
= (struct elf_i386_link_hash_entry
*) dir
;
1305 eind
= (struct elf_i386_link_hash_entry
*) ind
;
1307 if (eind
->dyn_relocs
!= NULL
)
1309 if (edir
->dyn_relocs
!= NULL
)
1311 struct elf_dyn_relocs
**pp
;
1312 struct elf_dyn_relocs
*p
;
1314 /* Add reloc counts against the indirect sym to the direct sym
1315 list. Merge any entries against the same section. */
1316 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1318 struct elf_dyn_relocs
*q
;
1320 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1321 if (q
->sec
== p
->sec
)
1323 q
->pc_count
+= p
->pc_count
;
1324 q
->count
+= p
->count
;
1331 *pp
= edir
->dyn_relocs
;
1334 edir
->dyn_relocs
= eind
->dyn_relocs
;
1335 eind
->dyn_relocs
= NULL
;
1338 if (ind
->root
.type
== bfd_link_hash_indirect
1339 && dir
->got
.refcount
<= 0)
1341 edir
->tls_type
= eind
->tls_type
;
1342 eind
->tls_type
= GOT_UNKNOWN
;
1345 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1346 generate a R_386_COPY reloc. */
1347 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1349 edir
->has_got_reloc
|= eind
->has_got_reloc
;
1350 edir
->has_non_got_reloc
|= eind
->has_non_got_reloc
;
1352 if (ELIMINATE_COPY_RELOCS
1353 && ind
->root
.type
!= bfd_link_hash_indirect
1354 && dir
->dynamic_adjusted
)
1356 /* If called to transfer flags for a weakdef during processing
1357 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1358 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1359 if (dir
->versioned
!= versioned_hidden
)
1360 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1361 dir
->ref_regular
|= ind
->ref_regular
;
1362 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1363 dir
->needs_plt
|= ind
->needs_plt
;
1364 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1368 if (eind
->func_pointer_refcount
> 0)
1370 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1371 eind
->func_pointer_refcount
= 0;
1374 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1378 /* Return TRUE if the TLS access code sequence support transition
1382 elf_i386_check_tls_transition (asection
*sec
,
1384 Elf_Internal_Shdr
*symtab_hdr
,
1385 struct elf_link_hash_entry
**sym_hashes
,
1386 unsigned int r_type
,
1387 const Elf_Internal_Rela
*rel
,
1388 const Elf_Internal_Rela
*relend
)
1390 unsigned int val
, type
, reg
;
1391 unsigned long r_symndx
;
1392 struct elf_link_hash_entry
*h
;
1395 bfd_boolean indirect_call
;
1397 offset
= rel
->r_offset
;
1402 if (offset
< 2 || (rel
+ 1) >= relend
)
1405 indirect_call
= FALSE
;
1406 call
= contents
+ offset
+ 4;
1409 if (r_type
== R_386_TLS_GD
)
1411 /* Check transition from GD access model. Only
1412 leal foo@tlsgd(,%ebx,1), %eax
1413 call ___tls_get_addr@PLT
1415 leal foo@tlsgd(%ebx) %eax
1416 call ___tls_get_addr@PLT
1419 leal foo@tlsgd(%reg), %eax
1420 call *___tls_get_addr@GOT(%reg)
1421 which may be converted to
1422 addr32 call ___tls_get_addr
1423 can transit to different access model. */
1424 if ((offset
+ 10) > sec
->size
1425 || (type
!= 0x8d && type
!= 0x04))
1430 /* leal foo@tlsgd(,%ebx,1), %eax
1431 call ___tls_get_addr@PLT */
1435 if (*(call
- 7) != 0x8d
1443 leal foo@tlsgd(%ebx), %eax
1444 call ___tls_get_addr@PLT
1447 leal foo@tlsgd(%reg), %eax
1448 call *___tls_get_addr@GOT(%reg)
1449 which may be converted to
1450 addr32 call ___tls_get_addr
1452 %eax can't be used as the GOT base register since it
1453 is used to pass parameter to ___tls_get_addr. */
1455 if ((val
& 0xf8) != 0x80 || reg
== 4 || reg
== 0)
1458 indirect_call
= call
[0] == 0xff;
1459 if (!(reg
== 3 && call
[0] == 0xe8 && call
[5] == 0x90)
1460 && !(call
[0] == 0x67 && call
[1] == 0xe8)
1462 && (call
[1] & 0xf8) == 0x90
1463 && (call
[1] & 0x7) == reg
))
1469 /* Check transition from LD access model. Only
1470 leal foo@tlsldm(%ebx), %eax
1471 call ___tls_get_addr@PLT
1473 leal foo@tlsldm(%reg), %eax
1474 call *___tls_get_addr@GOT(%reg)
1475 which may be converted to
1476 addr32 call ___tls_get_addr
1477 can transit to different access model. */
1478 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
1481 /* %eax can't be used as the GOT base register since it is
1482 used to pass parameter to ___tls_get_addr. */
1484 if ((val
& 0xf8) != 0x80 || reg
== 4 || reg
== 0)
1487 indirect_call
= call
[0] == 0xff;
1488 if (!(reg
== 3 && call
[0] == 0xe8)
1489 && !(call
[0] == 0x67 && call
[1] == 0xe8)
1491 && (call
[1] & 0xf8) == 0x90
1492 && (call
[1] & 0x7) == reg
))
1496 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
1497 if (r_symndx
< symtab_hdr
->sh_info
)
1500 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1502 || !((struct elf_i386_link_hash_entry
*) h
)->tls_get_addr
)
1504 else if (indirect_call
)
1505 return (ELF32_R_TYPE (rel
[1].r_info
) == R_386_GOT32X
);
1507 return (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
1508 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
1511 /* Check transition from IE access model:
1512 movl foo@indntpoff(%rip), %eax
1513 movl foo@indntpoff(%rip), %reg
1514 addl foo@indntpoff(%rip), %reg
1517 if (offset
< 1 || (offset
+ 4) > sec
->size
)
1520 /* Check "movl foo@tpoff(%rip), %eax" first. */
1521 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1528 /* Check movl|addl foo@tpoff(%rip), %reg. */
1529 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1530 return ((type
== 0x8b || type
== 0x03)
1531 && (val
& 0xc7) == 0x05);
1533 case R_386_TLS_GOTIE
:
1534 case R_386_TLS_IE_32
:
1535 /* Check transition from {IE_32,GOTIE} access model:
1536 subl foo@{tpoff,gontoff}(%reg1), %reg2
1537 movl foo@{tpoff,gontoff}(%reg1), %reg2
1538 addl foo@{tpoff,gontoff}(%reg1), %reg2
1541 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1544 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1545 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1548 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1549 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1551 case R_386_TLS_GOTDESC
:
1552 /* Check transition from GDesc access model:
1553 leal x@tlsdesc(%ebx), %eax
1555 Make sure it's a leal adding ebx to a 32-bit offset
1556 into any register, although it's probably almost always
1559 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1562 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1565 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1566 return (val
& 0xc7) == 0x83;
1568 case R_386_TLS_DESC_CALL
:
1569 /* Check transition from GDesc access model:
1570 call *x@tlsdesc(%eax)
1572 if (offset
+ 2 <= sec
->size
)
1574 /* Make sure that it's a call *x@tlsdesc(%eax). */
1575 call
= contents
+ offset
;
1576 return call
[0] == 0xff && call
[1] == 0x10;
1586 /* Return TRUE if the TLS access transition is OK or no transition
1587 will be performed. Update R_TYPE if there is a transition. */
1590 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1591 asection
*sec
, bfd_byte
*contents
,
1592 Elf_Internal_Shdr
*symtab_hdr
,
1593 struct elf_link_hash_entry
**sym_hashes
,
1594 unsigned int *r_type
, int tls_type
,
1595 const Elf_Internal_Rela
*rel
,
1596 const Elf_Internal_Rela
*relend
,
1597 struct elf_link_hash_entry
*h
,
1598 unsigned long r_symndx
,
1599 bfd_boolean from_relocate_section
)
1601 unsigned int from_type
= *r_type
;
1602 unsigned int to_type
= from_type
;
1603 bfd_boolean check
= TRUE
;
1605 /* Skip TLS transition for functions. */
1607 && (h
->type
== STT_FUNC
1608 || h
->type
== STT_GNU_IFUNC
))
1614 case R_386_TLS_GOTDESC
:
1615 case R_386_TLS_DESC_CALL
:
1616 case R_386_TLS_IE_32
:
1618 case R_386_TLS_GOTIE
:
1619 if (bfd_link_executable (info
))
1622 to_type
= R_386_TLS_LE_32
;
1623 else if (from_type
!= R_386_TLS_IE
1624 && from_type
!= R_386_TLS_GOTIE
)
1625 to_type
= R_386_TLS_IE_32
;
1628 /* When we are called from elf_i386_relocate_section, there may
1629 be additional transitions based on TLS_TYPE. */
1630 if (from_relocate_section
)
1632 unsigned int new_to_type
= to_type
;
1634 if (bfd_link_executable (info
)
1637 && (tls_type
& GOT_TLS_IE
))
1638 new_to_type
= R_386_TLS_LE_32
;
1640 if (to_type
== R_386_TLS_GD
1641 || to_type
== R_386_TLS_GOTDESC
1642 || to_type
== R_386_TLS_DESC_CALL
)
1644 if (tls_type
== GOT_TLS_IE_POS
)
1645 new_to_type
= R_386_TLS_GOTIE
;
1646 else if (tls_type
& GOT_TLS_IE
)
1647 new_to_type
= R_386_TLS_IE_32
;
1650 /* We checked the transition before when we were called from
1651 elf_i386_check_relocs. We only want to check the new
1652 transition which hasn't been checked before. */
1653 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1654 to_type
= new_to_type
;
1660 if (bfd_link_executable (info
))
1661 to_type
= R_386_TLS_LE_32
;
1668 /* Return TRUE if there is no transition. */
1669 if (from_type
== to_type
)
1672 /* Check if the transition can be performed. */
1674 && ! elf_i386_check_tls_transition (sec
, contents
,
1675 symtab_hdr
, sym_hashes
,
1676 from_type
, rel
, relend
))
1678 reloc_howto_type
*from
, *to
;
1681 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1682 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1685 name
= h
->root
.root
.string
;
1688 struct elf_i386_link_hash_table
*htab
;
1690 htab
= elf_i386_hash_table (info
);
1695 Elf_Internal_Sym
*isym
;
1697 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1699 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1704 /* xgettext:c-format */
1705 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1706 "in section `%A' failed"),
1707 abfd
, from
->name
, to
->name
, name
,
1708 rel
->r_offset
, sec
);
1709 bfd_set_error (bfd_error_bad_value
);
1717 /* With the local symbol, foo, we convert
1718 mov foo@GOT[(%reg1)], %reg2
1720 lea foo[@GOTOFF(%reg1)], %reg2
1722 call/jmp *foo@GOT[(%reg)]
1724 nop call foo/jmp foo nop
1725 When PIC is false, convert
1726 test %reg1, foo@GOT[(%reg2)]
1730 binop foo@GOT[(%reg1)], %reg2
1733 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1738 elf_i386_convert_load_reloc (bfd
*abfd
, Elf_Internal_Shdr
*symtab_hdr
,
1740 Elf_Internal_Rela
*irel
,
1741 struct elf_link_hash_entry
*h
,
1742 bfd_boolean
*converted
,
1743 struct bfd_link_info
*link_info
)
1745 struct elf_i386_link_hash_table
*htab
;
1746 unsigned int opcode
;
1748 bfd_boolean baseless
;
1749 Elf_Internal_Sym
*isym
;
1750 unsigned int addend
;
1754 bfd_boolean to_reloc_32
;
1755 unsigned int r_type
;
1756 unsigned int r_symndx
;
1757 bfd_vma roff
= irel
->r_offset
;
1762 /* Addend for R_386_GOT32X relocations must be 0. */
1763 addend
= bfd_get_32 (abfd
, contents
+ roff
);
1767 htab
= elf_i386_hash_table (link_info
);
1768 is_pic
= bfd_link_pic (link_info
);
1770 r_type
= ELF32_R_TYPE (irel
->r_info
);
1771 r_symndx
= ELF32_R_SYM (irel
->r_info
);
1773 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1774 baseless
= (modrm
& 0xc7) == 0x5;
1776 if (baseless
&& is_pic
)
1778 /* For PIC, disallow R_386_GOT32X without a base register
1779 since we don't know what the GOT base is. */
1784 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
, abfd
,
1786 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1789 name
= h
->root
.root
.string
;
1792 /* xgettext:c-format */
1793 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1794 " register can not be used when making a shared object"),
1799 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1801 /* Convert to R_386_32 if PIC is false or there is no base
1803 to_reloc_32
= !is_pic
|| baseless
;
1805 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1809 if (opcode
== 0x0ff)
1810 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1811 goto convert_branch
;
1813 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1814 "test %reg1, foo@GOT(%reg2)" and
1815 "binop foo@GOT[(%reg1)], %reg2". */
1819 /* Undefined weak symbol is only bound locally in executable
1820 and its reference is resolved as 0. */
1821 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info
, TRUE
,
1822 elf_i386_hash_entry (h
)))
1826 /* No direct branch to 0 for PIC. */
1830 goto convert_branch
;
1834 /* We can convert load of address 0 to R_386_32. */
1842 /* We have "call/jmp *foo@GOT[(%reg)]". */
1843 if ((h
->root
.type
== bfd_link_hash_defined
1844 || h
->root
.type
== bfd_link_hash_defweak
)
1845 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
1847 /* The function is locally defined. */
1849 /* Convert R_386_GOT32X to R_386_PC32. */
1850 if (modrm
== 0x15 || (modrm
& 0xf8) == 0x90)
1852 struct elf_i386_link_hash_entry
*eh
1853 = (struct elf_i386_link_hash_entry
*) h
;
1855 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1858 /* To support TLS optimization, always use addr32 prefix
1859 for "call *___tls_get_addr@GOT(%reg)". */
1860 if (eh
&& eh
->tls_get_addr
)
1863 nop_offset
= irel
->r_offset
- 2;
1867 nop
= link_info
->call_nop_byte
;
1868 if (link_info
->call_nop_as_suffix
)
1870 nop_offset
= roff
+ 3;
1871 irel
->r_offset
-= 1;
1874 nop_offset
= roff
- 2;
1879 /* Convert to "jmp foo nop". */
1882 nop_offset
= roff
+ 3;
1883 irel
->r_offset
-= 1;
1886 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
1887 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
1888 /* When converting to PC-relative relocation, we
1889 need to adjust addend by -4. */
1890 bfd_put_32 (abfd
, -4, contents
+ irel
->r_offset
);
1891 irel
->r_info
= ELF32_R_INFO (r_symndx
, R_386_PC32
);
1898 /* We have "mov foo@GOT[(%re1g)], %reg2",
1899 "test %reg1, foo@GOT(%reg2)" and
1900 "binop foo@GOT[(%reg1)], %reg2".
1902 Avoid optimizing _DYNAMIC since ld.so may use its
1903 link-time address. */
1904 if (h
== htab
->elf
.hdynamic
)
1907 /* def_regular is set by an assignment in a linker script in
1908 bfd_elf_record_link_assignment. start_stop is set on
1909 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1912 || h
->root
.type
== bfd_link_hash_defined
1913 || h
->root
.type
== bfd_link_hash_defweak
)
1914 && SYMBOL_REFERENCES_LOCAL (link_info
, h
)))
1921 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1922 "mov $foo, %reg2" with R_386_32. */
1924 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1925 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1930 /* Convert "mov foo@GOT(%reg1), %reg2" to
1931 "lea foo@GOTOFF(%reg1), %reg2". */
1932 r_type
= R_386_GOTOFF
;
1938 /* Only R_386_32 is supported. */
1944 /* Convert "test %reg1, foo@GOT(%reg2)" to
1945 "test $foo, %reg1". */
1946 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1951 /* Convert "binop foo@GOT(%reg1), %reg2" to
1952 "binop $foo, %reg2". */
1954 | (modrm
& 0x38) >> 3
1958 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1962 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
1963 irel
->r_info
= ELF32_R_INFO (r_symndx
, r_type
);
1972 /* Rename some of the generic section flags to better document how they
1974 #define need_convert_load sec_flg0
1975 #define check_relocs_failed sec_flg1
1977 /* Look through the relocs for a section during the first phase, and
1978 calculate needed space in the global offset table, procedure linkage
1979 table, and dynamic reloc sections. */
1982 elf_i386_check_relocs (bfd
*abfd
,
1983 struct bfd_link_info
*info
,
1985 const Elf_Internal_Rela
*relocs
)
1987 struct elf_i386_link_hash_table
*htab
;
1988 Elf_Internal_Shdr
*symtab_hdr
;
1989 struct elf_link_hash_entry
**sym_hashes
;
1990 const Elf_Internal_Rela
*rel
;
1991 const Elf_Internal_Rela
*rel_end
;
1995 if (bfd_link_relocatable (info
))
1998 /* Don't do anything special with non-loaded, non-alloced sections.
1999 In particular, any relocs in such sections should not affect GOT
2000 and PLT reference counting (ie. we don't allow them to create GOT
2001 or PLT entries), there's no possibility or desire to optimize TLS
2002 relocs, and there's not much point in propagating relocs to shared
2003 libs that the dynamic linker won't relocate. */
2004 if ((sec
->flags
& SEC_ALLOC
) == 0)
2007 BFD_ASSERT (is_i386_elf (abfd
));
2009 htab
= elf_i386_hash_table (info
);
2012 sec
->check_relocs_failed
= 1;
2016 /* Get the section contents. */
2017 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2018 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2019 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2021 sec
->check_relocs_failed
= 1;
2025 symtab_hdr
= &elf_symtab_hdr (abfd
);
2026 sym_hashes
= elf_sym_hashes (abfd
);
2030 rel_end
= relocs
+ sec
->reloc_count
;
2031 for (rel
= relocs
; rel
< rel_end
; rel
++)
2033 unsigned int r_type
;
2034 unsigned int r_symndx
;
2035 struct elf_link_hash_entry
*h
;
2036 struct elf_i386_link_hash_entry
*eh
;
2037 Elf_Internal_Sym
*isym
;
2039 bfd_boolean size_reloc
;
2041 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2042 r_type
= ELF32_R_TYPE (rel
->r_info
);
2044 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
2046 /* xgettext:c-format */
2047 _bfd_error_handler (_("%B: bad symbol index: %d"),
2052 if (r_symndx
< symtab_hdr
->sh_info
)
2054 /* A local symbol. */
2055 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2060 /* Check relocation against local STT_GNU_IFUNC symbol. */
2061 if (ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2063 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
, TRUE
);
2067 /* Fake a STT_GNU_IFUNC symbol. */
2068 h
->root
.root
.string
= bfd_elf_sym_name (abfd
, symtab_hdr
,
2070 h
->type
= STT_GNU_IFUNC
;
2073 h
->forced_local
= 1;
2074 h
->root
.type
= bfd_link_hash_defined
;
2082 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2083 while (h
->root
.type
== bfd_link_hash_indirect
2084 || h
->root
.type
== bfd_link_hash_warning
)
2085 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2088 eh
= (struct elf_i386_link_hash_entry
*) h
;
2091 if (r_type
== R_386_GOTOFF
)
2094 /* It is referenced by a non-shared object. */
2096 h
->root
.non_ir_ref_regular
= 1;
2098 if (h
->type
== STT_GNU_IFUNC
)
2099 elf_tdata (info
->output_bfd
)->has_gnu_symbols
2100 |= elf_gnu_symbol_ifunc
;
2103 if (! elf_i386_tls_transition (info
, abfd
, sec
, contents
,
2104 symtab_hdr
, sym_hashes
,
2105 &r_type
, GOT_UNKNOWN
,
2106 rel
, rel_end
, h
, r_symndx
, FALSE
))
2112 htab
->tls_ldm_got
.refcount
+= 1;
2116 /* This symbol requires a procedure linkage table entry. We
2117 actually build the entry in adjust_dynamic_symbol,
2118 because this might be a case of linking PIC code which is
2119 never referenced by a dynamic object, in which case we
2120 don't need to generate a procedure linkage table entry
2123 /* If this is a local symbol, we resolve it directly without
2124 creating a procedure linkage table entry. */
2128 eh
->has_got_reloc
= 1;
2130 h
->plt
.refcount
+= 1;
2137 case R_386_TLS_IE_32
:
2139 case R_386_TLS_GOTIE
:
2140 if (!bfd_link_executable (info
))
2141 info
->flags
|= DF_STATIC_TLS
;
2147 case R_386_TLS_GOTDESC
:
2148 case R_386_TLS_DESC_CALL
:
2149 /* This symbol requires a global offset table entry. */
2151 int tls_type
, old_tls_type
;
2158 tls_type
= GOT_NORMAL
;
2160 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
2161 case R_386_TLS_GOTDESC
:
2162 case R_386_TLS_DESC_CALL
:
2163 tls_type
= GOT_TLS_GDESC
; break;
2164 case R_386_TLS_IE_32
:
2165 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
2166 tls_type
= GOT_TLS_IE_NEG
;
2168 /* If this is a GD->IE transition, we may use either of
2169 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2170 tls_type
= GOT_TLS_IE
;
2173 case R_386_TLS_GOTIE
:
2174 tls_type
= GOT_TLS_IE_POS
; break;
2179 h
->got
.refcount
+= 1;
2180 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2184 bfd_signed_vma
*local_got_refcounts
;
2186 /* This is a global offset table entry for a local symbol. */
2187 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2188 if (local_got_refcounts
== NULL
)
2192 size
= symtab_hdr
->sh_info
;
2193 size
*= (sizeof (bfd_signed_vma
)
2194 + sizeof (bfd_vma
) + sizeof(char));
2195 local_got_refcounts
= (bfd_signed_vma
*)
2196 bfd_zalloc (abfd
, size
);
2197 if (local_got_refcounts
== NULL
)
2199 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
2200 elf_i386_local_tlsdesc_gotent (abfd
)
2201 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
2202 elf_i386_local_got_tls_type (abfd
)
2203 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
2205 local_got_refcounts
[r_symndx
] += 1;
2206 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
2209 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
2210 tls_type
|= old_tls_type
;
2211 /* If a TLS symbol is accessed using IE at least once,
2212 there is no point to use dynamic model for it. */
2213 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
2214 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
2215 || (tls_type
& GOT_TLS_IE
) == 0))
2217 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
2218 tls_type
= old_tls_type
;
2219 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
2220 && GOT_TLS_GD_ANY_P (tls_type
))
2221 tls_type
|= old_tls_type
;
2225 name
= h
->root
.root
.string
;
2227 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
2230 /* xgettext:c-format */
2231 (_("%B: `%s' accessed both as normal and "
2232 "thread local symbol"),
2234 bfd_set_error (bfd_error_bad_value
);
2239 if (old_tls_type
!= tls_type
)
2242 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
2244 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
2252 if (r_type
!= R_386_TLS_IE
)
2255 eh
->has_got_reloc
= 1;
2260 case R_386_TLS_LE_32
:
2263 eh
->has_got_reloc
= 1;
2264 if (bfd_link_executable (info
))
2266 info
->flags
|= DF_STATIC_TLS
;
2271 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
2272 eh
->has_non_got_reloc
= 1;
2274 /* We are called after all symbols have been resolved. Only
2275 relocation against STT_GNU_IFUNC symbol must go through
2278 && (bfd_link_executable (info
)
2279 || h
->type
== STT_GNU_IFUNC
))
2281 /* If this reloc is in a read-only section, we might
2282 need a copy reloc. We can't check reliably at this
2283 stage whether the section is read-only, as input
2284 sections have not yet been mapped to output sections.
2285 Tentatively set the flag for now, and correct in
2286 adjust_dynamic_symbol. */
2289 /* We may need a .plt entry if the symbol is a function
2290 defined in a shared lib or is a STT_GNU_IFUNC function
2291 referenced from the code or read-only section. */
2293 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2294 h
->plt
.refcount
+= 1;
2296 if (r_type
== R_386_PC32
)
2298 /* Since something like ".long foo - ." may be used
2299 as pointer, make sure that PLT is used if foo is
2300 a function defined in a shared library. */
2301 if ((sec
->flags
& SEC_CODE
) == 0)
2302 h
->pointer_equality_needed
= 1;
2303 else if (h
->type
== STT_GNU_IFUNC
2304 && bfd_link_pic (info
))
2307 /* xgettext:c-format */
2308 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2309 abfd
, h
->root
.root
.string
);
2310 bfd_set_error (bfd_error_bad_value
);
2316 h
->pointer_equality_needed
= 1;
2317 /* R_386_32 can be resolved at run-time. */
2318 if (r_type
== R_386_32
2319 && (sec
->flags
& SEC_READONLY
) == 0)
2320 eh
->func_pointer_refcount
+= 1;
2326 /* If we are creating a shared library, and this is a reloc
2327 against a global symbol, or a non PC relative reloc
2328 against a local symbol, then we need to copy the reloc
2329 into the shared library. However, if we are linking with
2330 -Bsymbolic, we do not need to copy a reloc against a
2331 global symbol which is defined in an object we are
2332 including in the link (i.e., DEF_REGULAR is set). At
2333 this point we have not seen all the input files, so it is
2334 possible that DEF_REGULAR is not set now but will be set
2335 later (it is never cleared). In case of a weak definition,
2336 DEF_REGULAR may be cleared later by a strong definition in
2337 a shared library. We account for that possibility below by
2338 storing information in the relocs_copied field of the hash
2339 table entry. A similar situation occurs when creating
2340 shared libraries and symbol visibility changes render the
2343 If on the other hand, we are creating an executable, we
2344 may need to keep relocations for symbols satisfied by a
2345 dynamic library if we manage to avoid copy relocs for the
2348 Generate dynamic pointer relocation against STT_GNU_IFUNC
2349 symbol in the non-code section. */
2350 if ((bfd_link_pic (info
)
2351 && (r_type
!= R_386_PC32
2353 && (! (bfd_link_pie (info
)
2354 || SYMBOLIC_BIND (info
, h
))
2355 || h
->root
.type
== bfd_link_hash_defweak
2356 || !h
->def_regular
))))
2358 && h
->type
== STT_GNU_IFUNC
2359 && r_type
== R_386_32
2360 && (sec
->flags
& SEC_CODE
) == 0)
2361 || (ELIMINATE_COPY_RELOCS
2362 && !bfd_link_pic (info
)
2364 && (h
->root
.type
== bfd_link_hash_defweak
2365 || !h
->def_regular
)))
2367 struct elf_dyn_relocs
*p
;
2368 struct elf_dyn_relocs
**head
;
2370 /* We must copy these reloc types into the output file.
2371 Create a reloc section in dynobj and make room for
2375 sreloc
= _bfd_elf_make_dynamic_reloc_section
2376 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
2382 /* If this is a global symbol, we count the number of
2383 relocations we need for this symbol. */
2386 head
= &eh
->dyn_relocs
;
2390 /* Track dynamic relocs needed for local syms too.
2391 We really need local syms available to do this
2396 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2401 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2405 vpp
= &elf_section_data (s
)->local_dynrel
;
2406 head
= (struct elf_dyn_relocs
**)vpp
;
2410 if (p
== NULL
|| p
->sec
!= sec
)
2412 bfd_size_type amt
= sizeof *p
;
2413 p
= (struct elf_dyn_relocs
*) bfd_alloc (htab
->elf
.dynobj
,
2425 /* Count size relocation as PC-relative relocation. */
2426 if (r_type
== R_386_PC32
|| size_reloc
)
2431 /* This relocation describes the C++ object vtable hierarchy.
2432 Reconstruct it for later use during GC. */
2433 case R_386_GNU_VTINHERIT
:
2434 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2438 /* This relocation describes which C++ vtable entries are actually
2439 used. Record for later use during GC. */
2440 case R_386_GNU_VTENTRY
:
2441 BFD_ASSERT (h
!= NULL
);
2443 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
2451 if (r_type
== R_386_GOT32X
2452 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2453 sec
->need_convert_load
= 1;
2456 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2458 if (!info
->keep_memory
)
2462 /* Cache the section contents for elf_link_input_bfd. */
2463 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2470 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2472 sec
->check_relocs_failed
= 1;
2476 /* Return the section that should be marked against GC for a given
2480 elf_i386_gc_mark_hook (asection
*sec
,
2481 struct bfd_link_info
*info
,
2482 Elf_Internal_Rela
*rel
,
2483 struct elf_link_hash_entry
*h
,
2484 Elf_Internal_Sym
*sym
)
2487 switch (ELF32_R_TYPE (rel
->r_info
))
2489 case R_386_GNU_VTINHERIT
:
2490 case R_386_GNU_VTENTRY
:
2494 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2497 /* Remove undefined weak symbol from the dynamic symbol table if it
2498 is resolved to 0. */
2501 elf_i386_fixup_symbol (struct bfd_link_info
*info
,
2502 struct elf_link_hash_entry
*h
)
2504 if (h
->dynindx
!= -1
2505 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
2506 elf_i386_hash_entry (h
)->has_got_reloc
,
2507 elf_i386_hash_entry (h
)))
2510 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
2516 /* Adjust a symbol defined by a dynamic object and referenced by a
2517 regular object. The current definition is in some section of the
2518 dynamic object, but we're not including those sections. We have to
2519 change the definition to something the rest of the link can
2523 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2524 struct elf_link_hash_entry
*h
)
2526 struct elf_i386_link_hash_table
*htab
;
2528 struct elf_i386_link_hash_entry
*eh
;
2529 struct elf_dyn_relocs
*p
;
2531 /* STT_GNU_IFUNC symbol must go through PLT. */
2532 if (h
->type
== STT_GNU_IFUNC
)
2534 /* All local STT_GNU_IFUNC references must be treate as local
2535 calls via local PLT. */
2537 && SYMBOL_CALLS_LOCAL (info
, h
))
2539 bfd_size_type pc_count
= 0, count
= 0;
2540 struct elf_dyn_relocs
**pp
;
2542 eh
= (struct elf_i386_link_hash_entry
*) h
;
2543 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2545 pc_count
+= p
->pc_count
;
2546 p
->count
-= p
->pc_count
;
2555 if (pc_count
|| count
)
2560 /* Increment PLT reference count only for PC-relative
2563 if (h
->plt
.refcount
<= 0)
2564 h
->plt
.refcount
= 1;
2566 h
->plt
.refcount
+= 1;
2571 if (h
->plt
.refcount
<= 0)
2573 h
->plt
.offset
= (bfd_vma
) -1;
2579 /* If this is a function, put it in the procedure linkage table. We
2580 will fill in the contents of the procedure linkage table later,
2581 when we know the address of the .got section. */
2582 if (h
->type
== STT_FUNC
2585 if (h
->plt
.refcount
<= 0
2586 || SYMBOL_CALLS_LOCAL (info
, h
)
2587 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2588 && h
->root
.type
== bfd_link_hash_undefweak
))
2590 /* This case can occur if we saw a PLT32 reloc in an input
2591 file, but the symbol was never referred to by a dynamic
2592 object, or if all references were garbage collected. In
2593 such a case, we don't actually need to build a procedure
2594 linkage table, and we can just do a PC32 reloc instead. */
2595 h
->plt
.offset
= (bfd_vma
) -1;
2602 /* It's possible that we incorrectly decided a .plt reloc was
2603 needed for an R_386_PC32 reloc to a non-function sym in
2604 check_relocs. We can't decide accurately between function and
2605 non-function syms in check-relocs; Objects loaded later in
2606 the link may change h->type. So fix it now. */
2607 h
->plt
.offset
= (bfd_vma
) -1;
2609 eh
= (struct elf_i386_link_hash_entry
*) h
;
2611 /* If this is a weak symbol, and there is a real definition, the
2612 processor independent code will have arranged for us to see the
2613 real definition first, and we can just use the same value. */
2614 if (h
->u
.weakdef
!= NULL
)
2616 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2617 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2618 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2619 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2620 if (ELIMINATE_COPY_RELOCS
2621 || info
->nocopyreloc
2622 || SYMBOL_NO_COPYRELOC (info
, eh
))
2623 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2627 /* This is a reference to a symbol defined by a dynamic object which
2628 is not a function. */
2630 /* If we are creating a shared library, we must presume that the
2631 only references to the symbol are via the global offset table.
2632 For such cases we need not do anything here; the relocations will
2633 be handled correctly by relocate_section. */
2634 if (!bfd_link_executable (info
))
2637 /* If there are no references to this symbol that do not use the
2638 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2640 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
2643 /* If -z nocopyreloc was given, we won't generate them either. */
2644 if (info
->nocopyreloc
|| SYMBOL_NO_COPYRELOC (info
, eh
))
2650 htab
= elf_i386_hash_table (info
);
2654 /* If there aren't any dynamic relocs in read-only sections nor
2655 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2656 avoid the copy reloc. This doesn't work on VxWorks, where we can
2657 not have dynamic relocations (other than copy and jump slot
2658 relocations) in an executable. */
2659 if (ELIMINATE_COPY_RELOCS
2661 && get_elf_i386_backend_data (info
->output_bfd
)->os
!= is_vxworks
)
2663 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2665 s
= p
->sec
->output_section
;
2666 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2677 /* We must allocate the symbol in our .dynbss section, which will
2678 become part of the .bss section of the executable. There will be
2679 an entry for this symbol in the .dynsym section. The dynamic
2680 object will contain position independent code, so all references
2681 from the dynamic object to this symbol will go through the global
2682 offset table. The dynamic linker will use the .dynsym entry to
2683 determine the address it must put in the global offset table, so
2684 both the dynamic object and the regular object will refer to the
2685 same memory location for the variable. */
2687 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2688 copy the initial value out of the dynamic object and into the
2689 runtime process image. */
2690 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
2692 s
= htab
->elf
.sdynrelro
;
2693 srel
= htab
->elf
.sreldynrelro
;
2697 s
= htab
->elf
.sdynbss
;
2698 srel
= htab
->elf
.srelbss
;
2700 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2702 srel
->size
+= sizeof (Elf32_External_Rel
);
2706 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2709 /* Allocate space in .plt, .got and associated reloc sections for
2713 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2715 struct bfd_link_info
*info
;
2716 struct elf_i386_link_hash_table
*htab
;
2717 struct elf_i386_link_hash_entry
*eh
;
2718 struct elf_dyn_relocs
*p
;
2719 unsigned plt_entry_size
;
2720 bfd_boolean resolved_to_zero
;
2721 const struct elf_i386_backend_data
*bed
;
2723 if (h
->root
.type
== bfd_link_hash_indirect
)
2726 eh
= (struct elf_i386_link_hash_entry
*) h
;
2728 info
= (struct bfd_link_info
*) inf
;
2729 htab
= elf_i386_hash_table (info
);
2733 bed
= get_elf_i386_backend_data (info
->output_bfd
);
2735 plt_entry_size
= htab
->plt
.plt_entry_size
;
2737 resolved_to_zero
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
2741 /* Clear the reference count of function pointer relocations if
2742 symbol isn't a normal function. */
2743 if (h
->type
!= STT_FUNC
)
2744 eh
->func_pointer_refcount
= 0;
2746 /* We can't use the GOT PLT if pointer equality is needed since
2747 finish_dynamic_symbol won't clear symbol value and the dynamic
2748 linker won't update the GOT slot. We will get into an infinite
2749 loop at run-time. */
2750 if (htab
->plt_got
!= NULL
2751 && h
->type
!= STT_GNU_IFUNC
2752 && !h
->pointer_equality_needed
2753 && h
->plt
.refcount
> 0
2754 && h
->got
.refcount
> 0)
2756 /* Don't use the regular PLT if there are both GOT and GOTPLT
2758 h
->plt
.offset
= (bfd_vma
) -1;
2760 /* Use the GOT PLT. */
2761 eh
->plt_got
.refcount
= 1;
2764 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2765 here if it is defined and referenced in a non-shared object. */
2766 if (h
->type
== STT_GNU_IFUNC
2769 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
, &eh
->dyn_relocs
,
2770 &htab
->readonly_dynrelocs_against_ifunc
,
2772 (htab
->plt
.has_plt0
*
2776 asection
*s
= htab
->plt_second
;
2777 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2779 /* Use the second PLT section if it is created. */
2780 eh
->plt_second
.offset
= s
->size
;
2782 /* Make room for this entry in the second PLT section. */
2783 s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
2791 /* Don't create the PLT entry if there are only function pointer
2792 relocations which can be resolved at run-time. */
2793 else if (htab
->elf
.dynamic_sections_created
2794 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2795 || eh
->plt_got
.refcount
> 0))
2797 bfd_boolean use_plt_got
= eh
->plt_got
.refcount
> 0;
2799 /* Clear the reference count of function pointer relocations
2801 eh
->func_pointer_refcount
= 0;
2803 /* Make sure this symbol is output as a dynamic symbol.
2804 Undefined weak syms won't yet be marked as dynamic. */
2805 if (h
->dynindx
== -1
2807 && !resolved_to_zero
2808 && h
->root
.type
== bfd_link_hash_undefweak
)
2810 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2814 if (bfd_link_pic (info
)
2815 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2817 asection
*s
= htab
->elf
.splt
;
2818 asection
*second_s
= htab
->plt_second
;
2819 asection
*got_s
= htab
->plt_got
;
2821 /* If this is the first .plt entry, make room for the special
2822 first entry. The .plt section is used by prelink to undo
2823 prelinking for dynamic relocations. */
2825 s
->size
= htab
->plt
.has_plt0
* plt_entry_size
;
2828 eh
->plt_got
.offset
= got_s
->size
;
2831 h
->plt
.offset
= s
->size
;
2833 eh
->plt_second
.offset
= second_s
->size
;
2836 /* If this symbol is not defined in a regular file, and we are
2837 not generating a shared library, then set the symbol to this
2838 location in the .plt. This is required to make function
2839 pointers compare as equal between the normal executable and
2840 the shared library. */
2841 if (! bfd_link_pic (info
)
2846 /* We need to make a call to the entry of the GOT PLT
2847 instead of regular PLT entry. */
2848 h
->root
.u
.def
.section
= got_s
;
2849 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2855 /* We need to make a call to the entry of the
2856 second PLT instead of regular PLT entry. */
2857 h
->root
.u
.def
.section
= second_s
;
2858 h
->root
.u
.def
.value
= eh
->plt_second
.offset
;
2862 h
->root
.u
.def
.section
= s
;
2863 h
->root
.u
.def
.value
= h
->plt
.offset
;
2868 /* Make room for this entry. */
2870 got_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
2873 s
->size
+= plt_entry_size
;
2875 second_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
2877 /* We also need to make an entry in the .got.plt section,
2878 which will be placed in the .got section by the linker
2880 htab
->elf
.sgotplt
->size
+= 4;
2882 /* There should be no PLT relocation against resolved
2883 undefined weak symbol in executable. */
2884 if (!resolved_to_zero
)
2886 /* We also need to make an entry in the .rel.plt
2888 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2889 htab
->elf
.srelplt
->reloc_count
++;
2893 if (bed
->os
== is_vxworks
&& !bfd_link_pic (info
))
2895 /* VxWorks has a second set of relocations for each PLT entry
2896 in executables. They go in a separate relocation section,
2897 which is processed by the kernel loader. */
2899 /* There are two relocations for the initial PLT entry: an
2900 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2901 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2903 if (h
->plt
.offset
== plt_entry_size
)
2904 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2906 /* There are two extra relocations for each subsequent PLT entry:
2907 an R_386_32 relocation for the GOT entry, and an R_386_32
2908 relocation for the PLT entry. */
2910 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2915 eh
->plt_got
.offset
= (bfd_vma
) -1;
2916 h
->plt
.offset
= (bfd_vma
) -1;
2922 eh
->plt_got
.offset
= (bfd_vma
) -1;
2923 h
->plt
.offset
= (bfd_vma
) -1;
2927 eh
->tlsdesc_got
= (bfd_vma
) -1;
2929 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2930 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2931 if (h
->got
.refcount
> 0
2932 && bfd_link_executable (info
)
2934 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
2935 h
->got
.offset
= (bfd_vma
) -1;
2936 else if (h
->got
.refcount
> 0)
2940 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2942 /* Make sure this symbol is output as a dynamic symbol.
2943 Undefined weak syms won't yet be marked as dynamic. */
2944 if (h
->dynindx
== -1
2946 && !resolved_to_zero
2947 && h
->root
.type
== bfd_link_hash_undefweak
)
2949 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2954 if (GOT_TLS_GDESC_P (tls_type
))
2956 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2957 - elf_i386_compute_jump_table_size (htab
);
2958 htab
->elf
.sgotplt
->size
+= 8;
2959 h
->got
.offset
= (bfd_vma
) -2;
2961 if (! GOT_TLS_GDESC_P (tls_type
)
2962 || GOT_TLS_GD_P (tls_type
))
2964 h
->got
.offset
= s
->size
;
2966 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2967 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
2970 dyn
= htab
->elf
.dynamic_sections_created
;
2971 /* R_386_TLS_IE_32 needs one dynamic relocation,
2972 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2973 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2974 need two), R_386_TLS_GD needs one if local symbol and two if
2975 global. No dynamic relocation against resolved undefined weak
2976 symbol in executable. */
2977 if (tls_type
== GOT_TLS_IE_BOTH
)
2978 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2979 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2980 || (tls_type
& GOT_TLS_IE
))
2981 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2982 else if (GOT_TLS_GD_P (tls_type
))
2983 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2984 else if (! GOT_TLS_GDESC_P (tls_type
)
2985 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2986 && !resolved_to_zero
)
2987 || h
->root
.type
!= bfd_link_hash_undefweak
)
2988 && (bfd_link_pic (info
)
2989 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2990 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2991 if (GOT_TLS_GDESC_P (tls_type
))
2992 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2995 h
->got
.offset
= (bfd_vma
) -1;
2997 if (eh
->dyn_relocs
== NULL
)
3000 /* In the shared -Bsymbolic case, discard space allocated for
3001 dynamic pc-relative relocs against symbols which turn out to be
3002 defined in regular objects. For the normal shared case, discard
3003 space for pc-relative relocs that have become local due to symbol
3004 visibility changes. */
3006 if (bfd_link_pic (info
))
3008 /* The only reloc that uses pc_count is R_386_PC32, which will
3009 appear on a call or on something like ".long foo - .". We
3010 want calls to protected symbols to resolve directly to the
3011 function rather than going via the plt. If people want
3012 function pointer comparisons to work as expected then they
3013 should avoid writing assembly like ".long foo - .". */
3014 if (SYMBOL_CALLS_LOCAL (info
, h
))
3016 struct elf_dyn_relocs
**pp
;
3018 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3020 p
->count
-= p
->pc_count
;
3029 if (bed
->os
== is_vxworks
)
3031 struct elf_dyn_relocs
**pp
;
3032 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3034 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
3041 /* Also discard relocs on undefined weak syms with non-default
3042 visibility or in PIE. */
3043 if (eh
->dyn_relocs
!= NULL
3044 && h
->root
.type
== bfd_link_hash_undefweak
)
3046 /* Undefined weak symbol is never bound locally in shared
3048 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3049 || resolved_to_zero
)
3053 /* Keep dynamic non-GOT/non-PLT relocation so that we
3054 can branch to 0 without PLT. */
3055 struct elf_dyn_relocs
**pp
;
3057 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3058 if (p
->pc_count
== 0)
3062 /* Remove non-R_386_PC32 relocation. */
3063 p
->count
= p
->pc_count
;
3067 if (eh
->dyn_relocs
!= NULL
)
3069 /* Make sure undefined weak symbols are output
3070 as dynamic symbols in PIEs for dynamic non-GOT
3071 non-PLT reloations. */
3072 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3077 eh
->dyn_relocs
= NULL
;
3079 else if (h
->dynindx
== -1
3080 && !h
->forced_local
)
3082 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3087 else if (ELIMINATE_COPY_RELOCS
)
3089 /* For the non-shared case, discard space for relocs against
3090 symbols which turn out to need copy relocs or are not
3091 dynamic. Keep dynamic relocations for run-time function
3092 pointer initialization. */
3094 if ((!h
->non_got_ref
3095 || eh
->func_pointer_refcount
> 0
3096 || (h
->root
.type
== bfd_link_hash_undefweak
3097 && !resolved_to_zero
))
3100 || (htab
->elf
.dynamic_sections_created
3101 && (h
->root
.type
== bfd_link_hash_undefweak
3102 || h
->root
.type
== bfd_link_hash_undefined
))))
3104 /* Make sure this symbol is output as a dynamic symbol.
3105 Undefined weak syms won't yet be marked as dynamic. */
3106 if (h
->dynindx
== -1
3108 && !resolved_to_zero
3109 && h
->root
.type
== bfd_link_hash_undefweak
)
3111 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3115 /* If that succeeded, we know we'll be keeping all the
3117 if (h
->dynindx
!= -1)
3121 eh
->dyn_relocs
= NULL
;
3122 eh
->func_pointer_refcount
= 0;
3127 /* Finally, allocate space. */
3128 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3132 sreloc
= elf_section_data (p
->sec
)->sreloc
;
3134 BFD_ASSERT (sreloc
!= NULL
);
3135 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
3141 /* Allocate space in .plt, .got and associated reloc sections for
3142 local dynamic relocs. */
3145 elf_i386_allocate_local_dynrelocs (void **slot
, void *inf
)
3147 struct elf_link_hash_entry
*h
3148 = (struct elf_link_hash_entry
*) *slot
;
3150 if (h
->type
!= STT_GNU_IFUNC
3154 || h
->root
.type
!= bfd_link_hash_defined
)
3157 return elf_i386_allocate_dynrelocs (h
, inf
);
3160 /* Find any dynamic relocs that apply to read-only sections. */
3163 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
3165 struct elf_i386_link_hash_entry
*eh
;
3166 struct elf_dyn_relocs
*p
;
3168 /* Skip local IFUNC symbols. */
3169 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
3172 eh
= (struct elf_i386_link_hash_entry
*) h
;
3173 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3175 asection
*s
= p
->sec
->output_section
;
3177 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
3179 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
3181 info
->flags
|= DF_TEXTREL
;
3183 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3184 || info
->error_textrel
)
3185 /* xgettext:c-format */
3186 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3187 p
->sec
->owner
, h
->root
.root
.string
,
3190 /* Not an error, just cut short the traversal. */
3197 /* Convert load via the GOT slot to load immediate. */
3200 elf_i386_convert_load (bfd
*abfd
, asection
*sec
,
3201 struct bfd_link_info
*link_info
)
3203 struct elf_i386_link_hash_table
*htab
;
3204 Elf_Internal_Shdr
*symtab_hdr
;
3205 Elf_Internal_Rela
*internal_relocs
;
3206 Elf_Internal_Rela
*irel
, *irelend
;
3208 bfd_boolean changed
;
3209 bfd_signed_vma
*local_got_refcounts
;
3211 /* Don't even try to convert non-ELF outputs. */
3212 if (!is_elf_hash_table (link_info
->hash
))
3215 /* Nothing to do if there is no need or no output. */
3216 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3217 || sec
->need_convert_load
== 0
3218 || bfd_is_abs_section (sec
->output_section
))
3221 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3223 /* Load the relocations for this section. */
3224 internal_relocs
= (_bfd_elf_link_read_relocs
3225 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3226 link_info
->keep_memory
));
3227 if (internal_relocs
== NULL
)
3231 htab
= elf_i386_hash_table (link_info
);
3232 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3234 /* Get the section contents. */
3235 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3236 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3239 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3243 irelend
= internal_relocs
+ sec
->reloc_count
;
3244 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3246 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3247 unsigned int r_symndx
;
3248 struct elf_link_hash_entry
*h
;
3249 bfd_boolean converted
;
3251 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3252 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3253 if (r_type
!= R_386_GOT32X
)
3256 r_symndx
= ELF32_R_SYM (irel
->r_info
);
3257 if (r_symndx
< symtab_hdr
->sh_info
)
3258 h
= elf_i386_get_local_sym_hash (htab
, sec
->owner
,
3259 (const Elf_Internal_Rela
*) irel
,
3263 h
= elf_sym_hashes (abfd
)[r_symndx
- symtab_hdr
->sh_info
];
3264 while (h
->root
.type
== bfd_link_hash_indirect
3265 || h
->root
.type
== bfd_link_hash_warning
)
3266 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3269 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3270 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
3274 if (!elf_i386_convert_load_reloc (abfd
, symtab_hdr
, contents
,
3275 irel
, h
, &converted
, link_info
))
3280 changed
= converted
;
3283 if (h
->got
.refcount
> 0)
3284 h
->got
.refcount
-= 1;
3288 if (local_got_refcounts
!= NULL
3289 && local_got_refcounts
[r_symndx
] > 0)
3290 local_got_refcounts
[r_symndx
] -= 1;
3295 if (contents
!= NULL
3296 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3298 if (!changed
&& !link_info
->keep_memory
)
3302 /* Cache the section contents for elf_link_input_bfd. */
3303 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3307 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3310 free (internal_relocs
);
3312 elf_section_data (sec
)->relocs
= internal_relocs
;
3318 if (contents
!= NULL
3319 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3321 if (internal_relocs
!= NULL
3322 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3323 free (internal_relocs
);
3327 /* Set the sizes of the dynamic sections. */
3330 elf_i386_size_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3332 struct elf_i386_link_hash_table
*htab
;
3338 htab
= elf_i386_hash_table (info
);
3341 dynobj
= htab
->elf
.dynobj
;
3345 /* Set up .got offsets for local syms, and space for local dynamic
3347 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3349 bfd_signed_vma
*local_got
;
3350 bfd_signed_vma
*end_local_got
;
3351 char *local_tls_type
;
3352 bfd_vma
*local_tlsdesc_gotent
;
3353 bfd_size_type locsymcount
;
3354 Elf_Internal_Shdr
*symtab_hdr
;
3357 if (! is_i386_elf (ibfd
))
3360 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3362 struct elf_dyn_relocs
*p
;
3364 if (!elf_i386_convert_load (ibfd
, s
, info
))
3367 for (p
= ((struct elf_dyn_relocs
*)
3368 elf_section_data (s
)->local_dynrel
);
3372 if (!bfd_is_abs_section (p
->sec
)
3373 && bfd_is_abs_section (p
->sec
->output_section
))
3375 /* Input section has been discarded, either because
3376 it is a copy of a linkonce section or due to
3377 linker script /DISCARD/, so we'll be discarding
3380 else if ((get_elf_i386_backend_data (output_bfd
)->os
3382 && strcmp (p
->sec
->output_section
->name
,
3385 /* Relocations in vxworks .tls_vars sections are
3386 handled specially by the loader. */
3388 else if (p
->count
!= 0)
3390 srel
= elf_section_data (p
->sec
)->sreloc
;
3391 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
3392 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3393 && (info
->flags
& DF_TEXTREL
) == 0)
3395 info
->flags
|= DF_TEXTREL
;
3396 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3397 || info
->error_textrel
)
3398 /* xgettext:c-format */
3399 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3400 p
->sec
->owner
, p
->sec
);
3406 local_got
= elf_local_got_refcounts (ibfd
);
3410 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3411 locsymcount
= symtab_hdr
->sh_info
;
3412 end_local_got
= local_got
+ locsymcount
;
3413 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
3414 local_tlsdesc_gotent
= elf_i386_local_tlsdesc_gotent (ibfd
);
3416 srel
= htab
->elf
.srelgot
;
3417 for (; local_got
< end_local_got
;
3418 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3420 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3423 if (GOT_TLS_GDESC_P (*local_tls_type
))
3425 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3426 - elf_i386_compute_jump_table_size (htab
);
3427 htab
->elf
.sgotplt
->size
+= 8;
3428 *local_got
= (bfd_vma
) -2;
3430 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3431 || GOT_TLS_GD_P (*local_tls_type
))
3433 *local_got
= s
->size
;
3435 if (GOT_TLS_GD_P (*local_tls_type
)
3436 || *local_tls_type
== GOT_TLS_IE_BOTH
)
3439 if (bfd_link_pic (info
)
3440 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3441 || (*local_tls_type
& GOT_TLS_IE
))
3443 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
3444 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
3445 else if (GOT_TLS_GD_P (*local_tls_type
)
3446 || ! GOT_TLS_GDESC_P (*local_tls_type
))
3447 srel
->size
+= sizeof (Elf32_External_Rel
);
3448 if (GOT_TLS_GDESC_P (*local_tls_type
))
3449 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
3453 *local_got
= (bfd_vma
) -1;
3457 if (htab
->tls_ldm_got
.refcount
> 0)
3459 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3461 htab
->tls_ldm_got
.offset
= htab
->elf
.sgot
->size
;
3462 htab
->elf
.sgot
->size
+= 8;
3463 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
3466 htab
->tls_ldm_got
.offset
= -1;
3468 /* Allocate global sym .plt and .got entries, and space for global
3469 sym dynamic relocs. */
3470 elf_link_hash_traverse (&htab
->elf
, elf_i386_allocate_dynrelocs
, info
);
3472 /* Allocate .plt and .got entries, and space for local symbols. */
3473 htab_traverse (htab
->loc_hash_table
,
3474 elf_i386_allocate_local_dynrelocs
,
3477 /* For every jump slot reserved in the sgotplt, reloc_count is
3478 incremented. However, when we reserve space for TLS descriptors,
3479 it's not incremented, so in order to compute the space reserved
3480 for them, it suffices to multiply the reloc count by the jump
3483 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3484 so that R_386_IRELATIVE entries come last. */
3485 if (htab
->elf
.srelplt
)
3487 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
3488 htab
->sgotplt_jump_table_size
= htab
->next_tls_desc_index
* 4;
3489 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3491 else if (htab
->elf
.irelplt
)
3492 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3495 if (htab
->elf
.sgotplt
)
3497 /* Don't allocate .got.plt section if there are no GOT nor PLT
3498 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3499 if ((htab
->elf
.hgot
== NULL
3500 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3501 && (htab
->elf
.sgotplt
->size
3502 == get_elf_backend_data (output_bfd
)->got_header_size
)
3503 && (htab
->elf
.splt
== NULL
3504 || htab
->elf
.splt
->size
== 0)
3505 && (htab
->elf
.sgot
== NULL
3506 || htab
->elf
.sgot
->size
== 0)
3507 && (htab
->elf
.iplt
== NULL
3508 || htab
->elf
.iplt
->size
== 0)
3509 && (htab
->elf
.igotplt
== NULL
3510 || htab
->elf
.igotplt
->size
== 0))
3511 htab
->elf
.sgotplt
->size
= 0;
3514 if (_bfd_elf_eh_frame_present (info
))
3516 if (htab
->plt_eh_frame
!= NULL
3517 && htab
->elf
.splt
!= NULL
3518 && htab
->elf
.splt
->size
!= 0
3519 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
3520 htab
->plt_eh_frame
->size
= htab
->plt
.eh_frame_plt_size
;
3522 if (htab
->plt_got_eh_frame
!= NULL
3523 && htab
->plt_got
!= NULL
3524 && htab
->plt_got
->size
!= 0
3525 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
3526 htab
->plt_got_eh_frame
->size
3527 = htab
->non_lazy_plt
->eh_frame_plt_size
;
3529 /* Unwind info for the second PLT and .plt.got sections are
3531 if (htab
->plt_second_eh_frame
!= NULL
3532 && htab
->plt_second
!= NULL
3533 && htab
->plt_second
->size
!= 0
3534 && !bfd_is_abs_section (htab
->plt_second
->output_section
))
3535 htab
->plt_second_eh_frame
->size
3536 = htab
->non_lazy_plt
->eh_frame_plt_size
;
3539 /* We now have determined the sizes of the various dynamic sections.
3540 Allocate memory for them. */
3542 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3544 bfd_boolean strip_section
= TRUE
;
3546 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3549 if (s
== htab
->elf
.splt
3550 || s
== htab
->elf
.sgot
)
3552 /* Strip this section if we don't need it; see the
3554 /* We'd like to strip these sections if they aren't needed, but if
3555 we've exported dynamic symbols from them we must leave them.
3556 It's too late to tell BFD to get rid of the symbols. */
3558 if (htab
->elf
.hplt
!= NULL
)
3559 strip_section
= FALSE
;
3561 else if (s
== htab
->elf
.sgotplt
3562 || s
== htab
->elf
.iplt
3563 || s
== htab
->elf
.igotplt
3564 || s
== htab
->plt_second
3565 || s
== htab
->plt_got
3566 || s
== htab
->plt_eh_frame
3567 || s
== htab
->plt_got_eh_frame
3568 || s
== htab
->plt_second_eh_frame
3569 || s
== htab
->elf
.sdynbss
3570 || s
== htab
->elf
.sdynrelro
)
3572 /* Strip these too. */
3574 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rel"))
3577 && s
!= htab
->elf
.srelplt
3578 && s
!= htab
->srelplt2
)
3581 /* We use the reloc_count field as a counter if we need
3582 to copy relocs into the output file. */
3587 /* It's not one of our sections, so don't allocate space. */
3593 /* If we don't need this section, strip it from the
3594 output file. This is mostly to handle .rel.bss and
3595 .rel.plt. We must create both sections in
3596 create_dynamic_sections, because they must be created
3597 before the linker maps input sections to output
3598 sections. The linker does that before
3599 adjust_dynamic_symbol is called, and it is that
3600 function which decides whether anything needs to go
3601 into these sections. */
3603 s
->flags
|= SEC_EXCLUDE
;
3607 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3610 /* Allocate memory for the section contents. We use bfd_zalloc
3611 here in case unused entries are not reclaimed before the
3612 section's contents are written out. This should not happen,
3613 but this way if it does, we get a R_386_NONE reloc instead
3615 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
3616 if (s
->contents
== NULL
)
3620 if (htab
->plt_eh_frame
!= NULL
3621 && htab
->plt_eh_frame
->contents
!= NULL
)
3623 memcpy (htab
->plt_eh_frame
->contents
,
3624 htab
->plt
.eh_frame_plt
,
3625 htab
->plt_eh_frame
->size
);
3626 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3627 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3630 if (htab
->plt_got_eh_frame
!= NULL
3631 && htab
->plt_got_eh_frame
->contents
!= NULL
)
3633 memcpy (htab
->plt_got_eh_frame
->contents
,
3634 htab
->non_lazy_plt
->eh_frame_plt
,
3635 htab
->plt_got_eh_frame
->size
);
3636 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
3637 (htab
->plt_got_eh_frame
->contents
3638 + PLT_FDE_LEN_OFFSET
));
3641 if (htab
->plt_second_eh_frame
!= NULL
3642 && htab
->plt_second_eh_frame
->contents
!= NULL
)
3644 memcpy (htab
->plt_second_eh_frame
->contents
,
3645 htab
->non_lazy_plt
->eh_frame_plt
,
3646 htab
->plt_second_eh_frame
->size
);
3647 bfd_put_32 (dynobj
, htab
->plt_second
->size
,
3648 (htab
->plt_second_eh_frame
->contents
3649 + PLT_FDE_LEN_OFFSET
));
3652 if (htab
->elf
.dynamic_sections_created
)
3654 /* Add some entries to the .dynamic section. We fill in the
3655 values later, in elf_i386_finish_dynamic_sections, but we
3656 must add the entries now so that we get the correct size for
3657 the .dynamic section. The DT_DEBUG entry is filled in by the
3658 dynamic linker and used by the debugger. */
3659 #define add_dynamic_entry(TAG, VAL) \
3660 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3662 if (bfd_link_executable (info
))
3664 if (!add_dynamic_entry (DT_DEBUG
, 0))
3668 if (htab
->elf
.splt
->size
!= 0)
3670 /* DT_PLTGOT is used by prelink even if there is no PLT
3672 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3676 if (htab
->elf
.srelplt
->size
!= 0)
3678 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3679 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3680 || !add_dynamic_entry (DT_JMPREL
, 0))
3686 if (!add_dynamic_entry (DT_REL
, 0)
3687 || !add_dynamic_entry (DT_RELSZ
, 0)
3688 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3691 /* If any dynamic relocs apply to a read-only section,
3692 then we need a DT_TEXTREL entry. */
3693 if ((info
->flags
& DF_TEXTREL
) == 0)
3694 elf_link_hash_traverse (&htab
->elf
,
3695 elf_i386_readonly_dynrelocs
, info
);
3697 if ((info
->flags
& DF_TEXTREL
) != 0)
3699 if (htab
->readonly_dynrelocs_against_ifunc
)
3701 info
->callbacks
->einfo
3702 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3703 bfd_set_error (bfd_error_bad_value
);
3707 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3711 if (get_elf_i386_backend_data (output_bfd
)->os
== is_vxworks
3712 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
3715 #undef add_dynamic_entry
3721 elf_i386_always_size_sections (bfd
*output_bfd
,
3722 struct bfd_link_info
*info
)
3724 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3728 struct elf_link_hash_entry
*tlsbase
;
3730 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3731 "_TLS_MODULE_BASE_",
3732 FALSE
, FALSE
, FALSE
);
3734 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3736 struct elf_i386_link_hash_table
*htab
;
3737 struct bfd_link_hash_entry
*bh
= NULL
;
3738 const struct elf_backend_data
*bed
3739 = get_elf_backend_data (output_bfd
);
3741 htab
= elf_i386_hash_table (info
);
3745 if (!(_bfd_generic_link_add_one_symbol
3746 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3747 tls_sec
, 0, NULL
, FALSE
,
3748 bed
->collect
, &bh
)))
3751 htab
->tls_module_base
= bh
;
3753 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3754 tlsbase
->def_regular
= 1;
3755 tlsbase
->other
= STV_HIDDEN
;
3756 tlsbase
->root
.linker_def
= 1;
3757 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3764 /* Set the correct type for an x86 ELF section. We do this by the
3765 section name, which is a hack, but ought to work. */
3768 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
3769 Elf_Internal_Shdr
*hdr
,
3774 name
= bfd_get_section_name (abfd
, sec
);
3776 /* This is an ugly, but unfortunately necessary hack that is
3777 needed when producing EFI binaries on x86. It tells
3778 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3779 containing ELF relocation info. We need this hack in order to
3780 be able to generate ELF binaries that can be translated into
3781 EFI applications (which are essentially COFF objects). Those
3782 files contain a COFF ".reloc" section inside an ELFNN object,
3783 which would normally cause BFD to segfault because it would
3784 attempt to interpret this section as containing relocation
3785 entries for section "oc". With this hack enabled, ".reloc"
3786 will be treated as a normal data section, which will avoid the
3787 segfault. However, you won't be able to create an ELFNN binary
3788 with a section named "oc" that needs relocations, but that's
3789 the kind of ugly side-effects you get when detecting section
3790 types based on their names... In practice, this limitation is
3791 unlikely to bite. */
3792 if (strcmp (name
, ".reloc") == 0)
3793 hdr
->sh_type
= SHT_PROGBITS
;
3798 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3799 executables. Rather than setting it to the beginning of the TLS
3800 section, we have to set it to the end. This function may be called
3801 multiple times, it is idempotent. */
3804 elf_i386_set_tls_module_base (struct bfd_link_info
*info
)
3806 struct elf_i386_link_hash_table
*htab
;
3807 struct bfd_link_hash_entry
*base
;
3809 if (!bfd_link_executable (info
))
3812 htab
= elf_i386_hash_table (info
);
3816 base
= htab
->tls_module_base
;
3820 base
->u
.def
.value
= htab
->elf
.tls_size
;
3823 /* Return the base VMA address which should be subtracted from real addresses
3824 when resolving @dtpoff relocation.
3825 This is PT_TLS segment p_vaddr. */
3828 elf_i386_dtpoff_base (struct bfd_link_info
*info
)
3830 /* If tls_sec is NULL, we should have signalled an error already. */
3831 if (elf_hash_table (info
)->tls_sec
== NULL
)
3833 return elf_hash_table (info
)->tls_sec
->vma
;
3836 /* Return the relocation value for @tpoff relocation
3837 if STT_TLS virtual address is ADDRESS. */
3840 elf_i386_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3842 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3843 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3844 bfd_vma static_tls_size
;
3846 /* If tls_sec is NULL, we should have signalled an error already. */
3847 if (htab
->tls_sec
== NULL
)
3850 /* Consider special static TLS alignment requirements. */
3851 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3852 return static_tls_size
+ htab
->tls_sec
->vma
- address
;
3855 /* Relocate an i386 ELF section. */
3858 elf_i386_relocate_section (bfd
*output_bfd
,
3859 struct bfd_link_info
*info
,
3861 asection
*input_section
,
3863 Elf_Internal_Rela
*relocs
,
3864 Elf_Internal_Sym
*local_syms
,
3865 asection
**local_sections
)
3867 struct elf_i386_link_hash_table
*htab
;
3868 Elf_Internal_Shdr
*symtab_hdr
;
3869 struct elf_link_hash_entry
**sym_hashes
;
3870 bfd_vma
*local_got_offsets
;
3871 bfd_vma
*local_tlsdesc_gotents
;
3872 Elf_Internal_Rela
*rel
;
3873 Elf_Internal_Rela
*wrel
;
3874 Elf_Internal_Rela
*relend
;
3875 bfd_boolean is_vxworks_tls
;
3876 unsigned plt_entry_size
;
3878 BFD_ASSERT (is_i386_elf (input_bfd
));
3880 /* Skip if check_relocs failed. */
3881 if (input_section
->check_relocs_failed
)
3884 htab
= elf_i386_hash_table (info
);
3887 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3888 sym_hashes
= elf_sym_hashes (input_bfd
);
3889 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3890 local_tlsdesc_gotents
= elf_i386_local_tlsdesc_gotent (input_bfd
);
3891 /* We have to handle relocations in vxworks .tls_vars sections
3892 specially, because the dynamic loader is 'weird'. */
3893 is_vxworks_tls
= ((get_elf_i386_backend_data (output_bfd
)->os
3895 && bfd_link_pic (info
)
3896 && !strcmp (input_section
->output_section
->name
,
3899 elf_i386_set_tls_module_base (info
);
3901 plt_entry_size
= htab
->plt
.plt_entry_size
;
3903 rel
= wrel
= relocs
;
3904 relend
= relocs
+ input_section
->reloc_count
;
3905 for (; rel
< relend
; wrel
++, rel
++)
3907 unsigned int r_type
;
3908 reloc_howto_type
*howto
;
3909 unsigned long r_symndx
;
3910 struct elf_link_hash_entry
*h
;
3911 struct elf_i386_link_hash_entry
*eh
;
3912 Elf_Internal_Sym
*sym
;
3914 bfd_vma off
, offplt
, plt_offset
;
3916 bfd_boolean unresolved_reloc
;
3917 bfd_reloc_status_type r
;
3921 asection
*resolved_plt
;
3922 bfd_boolean resolved_to_zero
;
3923 bfd_boolean relative_reloc
;
3925 r_type
= ELF32_R_TYPE (rel
->r_info
);
3926 if (r_type
== R_386_GNU_VTINHERIT
3927 || r_type
== R_386_GNU_VTENTRY
)
3934 if ((indx
= r_type
) >= R_386_standard
3935 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
3936 >= R_386_ext
- R_386_standard
)
3937 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
3938 >= R_386_ext2
- R_386_ext
))
3939 return _bfd_unrecognized_reloc (input_bfd
, input_section
, r_type
);
3941 howto
= elf_howto_table
+ indx
;
3943 r_symndx
= ELF32_R_SYM (rel
->r_info
);
3947 unresolved_reloc
= FALSE
;
3948 if (r_symndx
< symtab_hdr
->sh_info
)
3950 sym
= local_syms
+ r_symndx
;
3951 sec
= local_sections
[r_symndx
];
3952 relocation
= (sec
->output_section
->vma
3953 + sec
->output_offset
3955 st_size
= sym
->st_size
;
3957 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
3958 && ((sec
->flags
& SEC_MERGE
) != 0
3959 || (bfd_link_relocatable (info
)
3960 && sec
->output_offset
!= 0)))
3963 bfd_byte
*where
= contents
+ rel
->r_offset
;
3965 switch (howto
->size
)
3968 addend
= bfd_get_8 (input_bfd
, where
);
3969 if (howto
->pc_relative
)
3971 addend
= (addend
^ 0x80) - 0x80;
3976 addend
= bfd_get_16 (input_bfd
, where
);
3977 if (howto
->pc_relative
)
3979 addend
= (addend
^ 0x8000) - 0x8000;
3984 addend
= bfd_get_32 (input_bfd
, where
);
3985 if (howto
->pc_relative
)
3987 addend
= (addend
^ 0x80000000) - 0x80000000;
3995 if (bfd_link_relocatable (info
))
3996 addend
+= sec
->output_offset
;
3999 asection
*msec
= sec
;
4000 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
4002 addend
-= relocation
;
4003 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
4006 switch (howto
->size
)
4009 /* FIXME: overflow checks. */
4010 if (howto
->pc_relative
)
4012 bfd_put_8 (input_bfd
, addend
, where
);
4015 if (howto
->pc_relative
)
4017 bfd_put_16 (input_bfd
, addend
, where
);
4020 if (howto
->pc_relative
)
4022 bfd_put_32 (input_bfd
, addend
, where
);
4026 else if (!bfd_link_relocatable (info
)
4027 && ELF32_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4029 /* Relocate against local STT_GNU_IFUNC symbol. */
4030 h
= elf_i386_get_local_sym_hash (htab
, input_bfd
, rel
,
4035 /* Set STT_GNU_IFUNC symbol value. */
4036 h
->root
.u
.def
.value
= sym
->st_value
;
4037 h
->root
.u
.def
.section
= sec
;
4042 bfd_boolean warned ATTRIBUTE_UNUSED
;
4043 bfd_boolean ignored ATTRIBUTE_UNUSED
;
4045 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
4046 r_symndx
, symtab_hdr
, sym_hashes
,
4048 unresolved_reloc
, warned
, ignored
);
4052 if (sec
!= NULL
&& discarded_section (sec
))
4054 _bfd_clear_contents (howto
, input_bfd
, input_section
,
4055 contents
+ rel
->r_offset
);
4056 wrel
->r_offset
= rel
->r_offset
;
4060 /* For ld -r, remove relocations in debug sections against
4061 sections defined in discarded sections. Not done for
4062 eh_frame editing code expects to be present. */
4063 if (bfd_link_relocatable (info
)
4064 && (input_section
->flags
& SEC_DEBUGGING
))
4070 if (bfd_link_relocatable (info
))
4077 eh
= (struct elf_i386_link_hash_entry
*) h
;
4079 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4080 it here if it is defined in a non-shared object. */
4082 && h
->type
== STT_GNU_IFUNC
4085 asection
*gotplt
, *base_got
;
4089 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4091 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4092 sections because such sections are not SEC_ALLOC and
4093 thus ld.so will not process them. */
4094 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4099 /* STT_GNU_IFUNC symbol must go through PLT. */
4100 if (htab
->elf
.splt
!= NULL
)
4102 if (htab
->plt_second
!= NULL
)
4104 resolved_plt
= htab
->plt_second
;
4105 plt_offset
= eh
->plt_second
.offset
;
4109 resolved_plt
= htab
->elf
.splt
;
4110 plt_offset
= h
->plt
.offset
;
4112 gotplt
= htab
->elf
.sgotplt
;
4116 resolved_plt
= htab
->elf
.iplt
;
4117 plt_offset
= h
->plt
.offset
;
4118 gotplt
= htab
->elf
.igotplt
;
4128 base_got
= htab
->elf
.sgot
;
4129 off
= h
->got
.offset
;
4131 if (base_got
== NULL
)
4134 if (off
== (bfd_vma
) -1)
4136 /* We can't use h->got.offset here to save state, or
4137 even just remember the offset, as finish_dynamic_symbol
4138 would use that as offset into .got. */
4140 if (h
->plt
.offset
== (bfd_vma
) -1)
4143 if (htab
->elf
.splt
!= NULL
)
4145 plt_index
= (h
->plt
.offset
/ plt_entry_size
4146 - htab
->plt
.has_plt0
);
4147 off
= (plt_index
+ 3) * 4;
4148 base_got
= htab
->elf
.sgotplt
;
4152 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4153 off
= plt_index
* 4;
4154 base_got
= htab
->elf
.igotplt
;
4157 if (h
->dynindx
== -1
4161 /* This references the local defitionion. We must
4162 initialize this entry in the global offset table.
4163 Since the offset must always be a multiple of 8,
4164 we use the least significant bit to record
4165 whether we have initialized it already.
4167 When doing a dynamic link, we create a .rela.got
4168 relocation entry to initialize the value. This
4169 is done in the finish_dynamic_symbol routine. */
4174 bfd_put_32 (output_bfd
, relocation
,
4175 base_got
->contents
+ off
);
4183 relocation
= (base_got
->output_section
->vma
4184 + base_got
->output_offset
+ off
4185 - gotplt
->output_section
->vma
4186 - gotplt
->output_offset
);
4188 if (rel
->r_offset
> 1
4189 && (*(contents
+ rel
->r_offset
- 1) & 0xc7) == 0x5
4190 && *(contents
+ rel
->r_offset
- 2) != 0x8d)
4192 if (bfd_link_pic (info
))
4193 goto disallow_got32
;
4195 /* Add the GOT base if there is no base register. */
4196 relocation
+= (gotplt
->output_section
->vma
4197 + gotplt
->output_offset
);
4199 else if (htab
->elf
.splt
== NULL
)
4201 /* Adjust for static executables. */
4202 relocation
+= gotplt
->output_offset
;
4208 if (h
->plt
.offset
== (bfd_vma
) -1)
4210 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4211 if (r_type
== R_386_32
4212 && (input_section
->flags
& SEC_CODE
) == 0)
4213 goto do_ifunc_pointer
;
4214 goto bad_ifunc_reloc
;
4217 relocation
= (resolved_plt
->output_section
->vma
4218 + resolved_plt
->output_offset
+ plt_offset
);
4224 if (h
->root
.root
.string
)
4225 name
= h
->root
.root
.string
;
4227 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4230 /* xgettext:c-format */
4231 (_("%B: relocation %s against STT_GNU_IFUNC "
4232 "symbol `%s' isn't supported"), input_bfd
,
4234 bfd_set_error (bfd_error_bad_value
);
4238 /* Generate dynamic relcoation only when there is a
4239 non-GOT reference in a shared object. */
4240 if ((bfd_link_pic (info
) && h
->non_got_ref
)
4241 || h
->plt
.offset
== (bfd_vma
) -1)
4243 Elf_Internal_Rela outrel
;
4248 /* Need a dynamic relocation to get the real function
4250 offset
= _bfd_elf_section_offset (output_bfd
,
4254 if (offset
== (bfd_vma
) -1
4255 || offset
== (bfd_vma
) -2)
4258 outrel
.r_offset
= (input_section
->output_section
->vma
4259 + input_section
->output_offset
4262 if (h
->dynindx
== -1
4264 || bfd_link_executable (info
))
4266 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
4267 h
->root
.root
.string
,
4268 h
->root
.u
.def
.section
->owner
);
4270 /* This symbol is resolved locally. */
4271 outrel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
4272 bfd_put_32 (output_bfd
,
4273 (h
->root
.u
.def
.value
4274 + h
->root
.u
.def
.section
->output_section
->vma
4275 + h
->root
.u
.def
.section
->output_offset
),
4279 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
4281 /* Dynamic relocations are stored in
4282 1. .rel.ifunc section in PIC object.
4283 2. .rel.got section in dynamic executable.
4284 3. .rel.iplt section in static executable. */
4285 if (bfd_link_pic (info
))
4286 sreloc
= htab
->elf
.irelifunc
;
4287 else if (htab
->elf
.splt
!= NULL
)
4288 sreloc
= htab
->elf
.srelgot
;
4290 sreloc
= htab
->elf
.irelplt
;
4291 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4293 /* If this reloc is against an external symbol, we
4294 do not want to fiddle with the addend. Otherwise,
4295 we need to include the symbol value so that it
4296 becomes an addend for the dynamic reloc. For an
4297 internal symbol, we have updated addend. */
4306 relocation
-= (gotplt
->output_section
->vma
4307 + gotplt
->output_offset
);
4312 resolved_to_zero
= (eh
!= NULL
4313 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
4320 /* Avoid optimizing _DYNAMIC since ld.so may use its
4321 link-time address. */
4322 if (h
== htab
->elf
.hdynamic
)
4325 if (bfd_link_pic (info
))
4327 /* It is OK to convert mov to lea and convert indirect
4328 branch to direct branch. It is OK to convert adc,
4329 add, and, cmp, or, sbb, sub, test, xor only when PIC
4331 unsigned int opcode
, addend
;
4332 addend
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
4335 opcode
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4336 if (opcode
!= 0x8b && opcode
!= 0xff)
4340 /* Resolve "mov GOT[(%reg)], %reg",
4341 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4342 and "binop foo@GOT[(%reg)], %reg". */
4344 || (h
->plt
.offset
== (bfd_vma
) -1
4345 && h
->got
.offset
== (bfd_vma
) -1)
4346 || htab
->elf
.sgotplt
== NULL
)
4349 offplt
= (htab
->elf
.sgotplt
->output_section
->vma
4350 + htab
->elf
.sgotplt
->output_offset
);
4352 /* It is relative to .got.plt section. */
4353 if (h
->got
.offset
!= (bfd_vma
) -1)
4354 /* Use GOT entry. Mask off the least significant bit in
4355 GOT offset which may be set by R_386_GOT32 processing
4357 relocation
= (htab
->elf
.sgot
->output_section
->vma
4358 + htab
->elf
.sgot
->output_offset
4359 + (h
->got
.offset
& ~1) - offplt
);
4361 /* Use GOTPLT entry. */
4362 relocation
= (h
->plt
.offset
/ plt_entry_size
4363 - htab
->plt
.has_plt0
+ 3) * 4;
4365 if (!bfd_link_pic (info
))
4367 /* If not PIC, add the .got.plt section address for
4368 baseless addressing. */
4370 modrm
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4371 if ((modrm
& 0xc7) == 0x5)
4372 relocation
+= offplt
;
4375 unresolved_reloc
= FALSE
;
4380 /* Relocation is to the entry for this symbol in the global
4382 if (htab
->elf
.sgot
== NULL
)
4385 relative_reloc
= FALSE
;
4390 off
= h
->got
.offset
;
4391 dyn
= htab
->elf
.dynamic_sections_created
;
4392 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
,
4393 bfd_link_pic (info
),
4395 || (bfd_link_pic (info
)
4396 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4397 || (ELF_ST_VISIBILITY (h
->other
)
4398 && h
->root
.type
== bfd_link_hash_undefweak
))
4400 /* This is actually a static link, or it is a
4401 -Bsymbolic link and the symbol is defined
4402 locally, or the symbol was forced to be local
4403 because of a version file. We must initialize
4404 this entry in the global offset table. Since the
4405 offset must always be a multiple of 4, we use the
4406 least significant bit to record whether we have
4407 initialized it already.
4409 When doing a dynamic link, we create a .rel.got
4410 relocation entry to initialize the value. This
4411 is done in the finish_dynamic_symbol routine. */
4416 bfd_put_32 (output_bfd
, relocation
,
4417 htab
->elf
.sgot
->contents
+ off
);
4420 if (h
->dynindx
== -1
4422 && h
->root
.type
!= bfd_link_hash_undefweak
4423 && bfd_link_pic (info
))
4425 /* PR ld/21402: If this symbol isn't dynamic
4426 in PIC, generate R_386_RELATIVE here. */
4427 eh
->no_finish_dynamic_symbol
= 1;
4428 relative_reloc
= TRUE
;
4433 unresolved_reloc
= FALSE
;
4437 if (local_got_offsets
== NULL
)
4440 off
= local_got_offsets
[r_symndx
];
4442 /* The offset must always be a multiple of 4. We use
4443 the least significant bit to record whether we have
4444 already generated the necessary reloc. */
4449 bfd_put_32 (output_bfd
, relocation
,
4450 htab
->elf
.sgot
->contents
+ off
);
4451 local_got_offsets
[r_symndx
] |= 1;
4453 if (bfd_link_pic (info
))
4454 relative_reloc
= TRUE
;
4461 Elf_Internal_Rela outrel
;
4463 s
= htab
->elf
.srelgot
;
4467 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4468 + htab
->elf
.sgot
->output_offset
4470 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4471 elf_append_rel (output_bfd
, s
, &outrel
);
4474 if (off
>= (bfd_vma
) -2)
4477 relocation
= (htab
->elf
.sgot
->output_section
->vma
4478 + htab
->elf
.sgot
->output_offset
+ off
);
4479 if (rel
->r_offset
> 1
4480 && (*(contents
+ rel
->r_offset
- 1) & 0xc7) == 0x5
4481 && *(contents
+ rel
->r_offset
- 2) != 0x8d)
4483 if (bfd_link_pic (info
))
4485 /* For PIC, disallow R_386_GOT32 without a base
4486 register, except for "lea foo@GOT, %reg", since
4487 we don't know what the GOT base is. */
4491 if (h
== NULL
|| h
->root
.root
.string
== NULL
)
4492 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4495 name
= h
->root
.root
.string
;
4498 /* xgettext:c-format */
4499 (_("%B: direct GOT relocation %s against `%s'"
4500 " without base register can not be used"
4501 " when making a shared object"),
4502 input_bfd
, howto
->name
, name
);
4503 bfd_set_error (bfd_error_bad_value
);
4509 /* Subtract the .got.plt section address only with a base
4511 relocation
-= (htab
->elf
.sgotplt
->output_section
->vma
4512 + htab
->elf
.sgotplt
->output_offset
);
4518 /* Relocation is relative to the start of the global offset
4521 /* Check to make sure it isn't a protected function or data
4522 symbol for shared library since it may not be local when
4523 used as function address or with copy relocation. We also
4524 need to make sure that a symbol is referenced locally. */
4525 if (!bfd_link_executable (info
) && h
)
4527 if (!h
->def_regular
)
4531 switch (ELF_ST_VISIBILITY (h
->other
))
4534 v
= _("hidden symbol");
4537 v
= _("internal symbol");
4540 v
= _("protected symbol");
4548 /* xgettext:c-format */
4549 (_("%B: relocation R_386_GOTOFF against undefined %s"
4550 " `%s' can not be used when making a shared object"),
4551 input_bfd
, v
, h
->root
.root
.string
);
4552 bfd_set_error (bfd_error_bad_value
);
4555 else if (!SYMBOL_REFERENCES_LOCAL (info
, h
)
4556 && (h
->type
== STT_FUNC
4557 || h
->type
== STT_OBJECT
)
4558 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4561 /* xgettext:c-format */
4562 (_("%B: relocation R_386_GOTOFF against protected %s"
4563 " `%s' can not be used when making a shared object"),
4565 h
->type
== STT_FUNC
? "function" : "data",
4566 h
->root
.root
.string
);
4567 bfd_set_error (bfd_error_bad_value
);
4572 /* Note that sgot is not involved in this
4573 calculation. We always want the start of .got.plt. If we
4574 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4575 permitted by the ABI, we might have to change this
4577 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4578 + htab
->elf
.sgotplt
->output_offset
;
4582 /* Use global offset table as symbol value. */
4583 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4584 + htab
->elf
.sgotplt
->output_offset
;
4585 unresolved_reloc
= FALSE
;
4589 /* Relocation is to the entry for this symbol in the
4590 procedure linkage table. */
4592 /* Resolve a PLT32 reloc against a local symbol directly,
4593 without using the procedure linkage table. */
4597 if ((h
->plt
.offset
== (bfd_vma
) -1
4598 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4599 || htab
->elf
.splt
== NULL
)
4601 /* We didn't make a PLT entry for this symbol. This
4602 happens when statically linking PIC code, or when
4603 using -Bsymbolic. */
4607 if (h
->plt
.offset
!= (bfd_vma
) -1)
4609 if (htab
->plt_second
!= NULL
)
4611 resolved_plt
= htab
->plt_second
;
4612 plt_offset
= eh
->plt_second
.offset
;
4616 resolved_plt
= htab
->elf
.splt
;
4617 plt_offset
= h
->plt
.offset
;
4622 resolved_plt
= htab
->plt_got
;
4623 plt_offset
= eh
->plt_got
.offset
;
4626 relocation
= (resolved_plt
->output_section
->vma
4627 + resolved_plt
->output_offset
4629 unresolved_reloc
= FALSE
;
4633 /* Set to symbol size. */
4634 relocation
= st_size
;
4639 if ((input_section
->flags
& SEC_ALLOC
) == 0
4643 /* Copy dynamic function pointer relocations. Don't generate
4644 dynamic relocations against resolved undefined weak symbols
4645 in PIE, except for R_386_PC32. */
4646 if ((bfd_link_pic (info
)
4648 || ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4649 && (!resolved_to_zero
4650 || r_type
== R_386_PC32
))
4651 || h
->root
.type
!= bfd_link_hash_undefweak
))
4652 && ((r_type
!= R_386_PC32
&& r_type
!= R_386_SIZE32
)
4653 || !SYMBOL_CALLS_LOCAL (info
, h
)))
4654 || (ELIMINATE_COPY_RELOCS
4655 && !bfd_link_pic (info
)
4659 || eh
->func_pointer_refcount
> 0
4660 || (h
->root
.type
== bfd_link_hash_undefweak
4661 && !resolved_to_zero
))
4662 && ((h
->def_dynamic
&& !h
->def_regular
)
4663 /* Undefined weak symbol is bound locally when
4665 || h
->root
.type
== bfd_link_hash_undefweak
)))
4667 Elf_Internal_Rela outrel
;
4668 bfd_boolean skip
, relocate
;
4671 /* When generating a shared object, these relocations
4672 are copied into the output file to be resolved at run
4679 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4681 if (outrel
.r_offset
== (bfd_vma
) -1)
4683 else if (outrel
.r_offset
== (bfd_vma
) -2)
4684 skip
= TRUE
, relocate
= TRUE
;
4685 outrel
.r_offset
+= (input_section
->output_section
->vma
4686 + input_section
->output_offset
);
4689 memset (&outrel
, 0, sizeof outrel
);
4692 && (r_type
== R_386_PC32
4693 || !(bfd_link_executable (info
)
4694 || SYMBOLIC_BIND (info
, h
))
4695 || !h
->def_regular
))
4696 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
4699 /* This symbol is local, or marked to become local. */
4701 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4704 sreloc
= elf_section_data (input_section
)->sreloc
;
4706 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4708 r
= bfd_reloc_notsupported
;
4709 goto check_relocation_error
;
4712 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4714 /* If this reloc is against an external symbol, we do
4715 not want to fiddle with the addend. Otherwise, we
4716 need to include the symbol value so that it becomes
4717 an addend for the dynamic reloc. */
4724 if (!bfd_link_executable (info
))
4726 Elf_Internal_Rela outrel
;
4729 outrel
.r_offset
= rel
->r_offset
4730 + input_section
->output_section
->vma
4731 + input_section
->output_offset
;
4732 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4733 sreloc
= elf_section_data (input_section
)->sreloc
;
4736 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4741 case R_386_TLS_GOTDESC
:
4742 case R_386_TLS_DESC_CALL
:
4743 case R_386_TLS_IE_32
:
4744 case R_386_TLS_GOTIE
:
4745 tls_type
= GOT_UNKNOWN
;
4746 if (h
== NULL
&& local_got_offsets
)
4747 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
4749 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
4750 if (tls_type
== GOT_TLS_IE
)
4751 tls_type
= GOT_TLS_IE_NEG
;
4753 if (! elf_i386_tls_transition (info
, input_bfd
,
4754 input_section
, contents
,
4755 symtab_hdr
, sym_hashes
,
4756 &r_type
, tls_type
, rel
,
4757 relend
, h
, r_symndx
, TRUE
))
4760 if (r_type
== R_386_TLS_LE_32
)
4762 BFD_ASSERT (! unresolved_reloc
);
4763 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
4768 /* GD->LE transition. */
4769 type
= *(contents
+ rel
->r_offset
- 2);
4773 leal foo@tlsgd(,%ebx,1), %eax
4774 call ___tls_get_addr@PLT
4777 subl $foo@tpoff, %eax
4778 (6 byte form of subl). */
4779 roff
= rel
->r_offset
+ 5;
4784 leal foo@tlsgd(%ebx), %eax
4785 call ___tls_get_addr@PLT
4788 leal foo@tlsgd(%reg), %eax
4789 call *___tls_get_addr@GOT(%reg)
4790 which may be converted to
4791 addr32 call ___tls_get_addr
4793 movl %gs:0, %eax; subl $foo@tpoff, %eax
4794 (6 byte form of subl). */
4795 roff
= rel
->r_offset
+ 6;
4797 memcpy (contents
+ roff
- 8,
4798 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4799 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
4801 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4806 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
4808 /* GDesc -> LE transition.
4809 It's originally something like:
4810 leal x@tlsdesc(%ebx), %eax
4814 Registers other than %eax may be set up here. */
4819 roff
= rel
->r_offset
;
4820 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4822 /* Now modify the instruction as appropriate. */
4823 /* aoliva FIXME: remove the above and xor the byte
4825 bfd_put_8 (output_bfd
, val
^ 0x86,
4826 contents
+ roff
- 1);
4827 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4831 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
4833 /* GDesc -> LE transition.
4841 roff
= rel
->r_offset
;
4842 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4843 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4846 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
4850 /* IE->LE transition:
4851 Originally it can be one of:
4859 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4862 /* movl foo, %eax. */
4863 bfd_put_8 (output_bfd
, 0xb8,
4864 contents
+ rel
->r_offset
- 1);
4870 type
= bfd_get_8 (input_bfd
,
4871 contents
+ rel
->r_offset
- 2);
4876 bfd_put_8 (output_bfd
, 0xc7,
4877 contents
+ rel
->r_offset
- 2);
4878 bfd_put_8 (output_bfd
,
4879 0xc0 | ((val
>> 3) & 7),
4880 contents
+ rel
->r_offset
- 1);
4884 bfd_put_8 (output_bfd
, 0x81,
4885 contents
+ rel
->r_offset
- 2);
4886 bfd_put_8 (output_bfd
,
4887 0xc0 | ((val
>> 3) & 7),
4888 contents
+ rel
->r_offset
- 1);
4895 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4896 contents
+ rel
->r_offset
);
4901 unsigned int val
, type
;
4903 /* {IE_32,GOTIE}->LE transition:
4904 Originally it can be one of:
4905 subl foo(%reg1), %reg2
4906 movl foo(%reg1), %reg2
4907 addl foo(%reg1), %reg2
4910 movl $foo, %reg2 (6 byte form)
4911 addl $foo, %reg2. */
4912 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4913 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4917 bfd_put_8 (output_bfd
, 0xc7,
4918 contents
+ rel
->r_offset
- 2);
4919 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4920 contents
+ rel
->r_offset
- 1);
4922 else if (type
== 0x2b)
4925 bfd_put_8 (output_bfd
, 0x81,
4926 contents
+ rel
->r_offset
- 2);
4927 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
4928 contents
+ rel
->r_offset
- 1);
4930 else if (type
== 0x03)
4933 bfd_put_8 (output_bfd
, 0x81,
4934 contents
+ rel
->r_offset
- 2);
4935 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4936 contents
+ rel
->r_offset
- 1);
4940 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
4941 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4942 contents
+ rel
->r_offset
);
4944 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
4945 contents
+ rel
->r_offset
);
4950 if (htab
->elf
.sgot
== NULL
)
4955 off
= h
->got
.offset
;
4956 offplt
= elf_i386_hash_entry (h
)->tlsdesc_got
;
4960 if (local_got_offsets
== NULL
)
4963 off
= local_got_offsets
[r_symndx
];
4964 offplt
= local_tlsdesc_gotents
[r_symndx
];
4971 Elf_Internal_Rela outrel
;
4975 if (htab
->elf
.srelgot
== NULL
)
4978 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4980 if (GOT_TLS_GDESC_P (tls_type
))
4983 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
4984 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
4985 <= htab
->elf
.sgotplt
->size
);
4986 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4987 + htab
->elf
.sgotplt
->output_offset
4989 + htab
->sgotplt_jump_table_size
);
4990 sreloc
= htab
->elf
.srelplt
;
4991 loc
= sreloc
->contents
;
4992 loc
+= (htab
->next_tls_desc_index
++
4993 * sizeof (Elf32_External_Rel
));
4994 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
4995 <= sreloc
->contents
+ sreloc
->size
);
4996 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4999 BFD_ASSERT (! unresolved_reloc
);
5000 bfd_put_32 (output_bfd
,
5001 relocation
- elf_i386_dtpoff_base (info
),
5002 htab
->elf
.sgotplt
->contents
+ offplt
5003 + htab
->sgotplt_jump_table_size
+ 4);
5007 bfd_put_32 (output_bfd
, 0,
5008 htab
->elf
.sgotplt
->contents
+ offplt
5009 + htab
->sgotplt_jump_table_size
+ 4);
5013 sreloc
= htab
->elf
.srelgot
;
5015 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5016 + htab
->elf
.sgot
->output_offset
+ off
);
5018 if (GOT_TLS_GD_P (tls_type
))
5019 dr_type
= R_386_TLS_DTPMOD32
;
5020 else if (GOT_TLS_GDESC_P (tls_type
))
5022 else if (tls_type
== GOT_TLS_IE_POS
)
5023 dr_type
= R_386_TLS_TPOFF
;
5025 dr_type
= R_386_TLS_TPOFF32
;
5027 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
5028 bfd_put_32 (output_bfd
,
5029 relocation
- elf_i386_dtpoff_base (info
),
5030 htab
->elf
.sgot
->contents
+ off
);
5031 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
5032 bfd_put_32 (output_bfd
,
5033 elf_i386_dtpoff_base (info
) - relocation
,
5034 htab
->elf
.sgot
->contents
+ off
);
5035 else if (dr_type
!= R_386_TLS_DESC
)
5036 bfd_put_32 (output_bfd
, 0,
5037 htab
->elf
.sgot
->contents
+ off
);
5038 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
5040 elf_append_rel (output_bfd
, sreloc
, &outrel
);
5042 if (GOT_TLS_GD_P (tls_type
))
5046 BFD_ASSERT (! unresolved_reloc
);
5047 bfd_put_32 (output_bfd
,
5048 relocation
- elf_i386_dtpoff_base (info
),
5049 htab
->elf
.sgot
->contents
+ off
+ 4);
5053 bfd_put_32 (output_bfd
, 0,
5054 htab
->elf
.sgot
->contents
+ off
+ 4);
5055 outrel
.r_info
= ELF32_R_INFO (indx
,
5056 R_386_TLS_DTPOFF32
);
5057 outrel
.r_offset
+= 4;
5058 elf_append_rel (output_bfd
, sreloc
, &outrel
);
5061 else if (tls_type
== GOT_TLS_IE_BOTH
)
5063 bfd_put_32 (output_bfd
,
5065 ? relocation
- elf_i386_dtpoff_base (info
)
5067 htab
->elf
.sgot
->contents
+ off
+ 4);
5068 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
5069 outrel
.r_offset
+= 4;
5070 elf_append_rel (output_bfd
, sreloc
, &outrel
);
5077 local_got_offsets
[r_symndx
] |= 1;
5080 if (off
>= (bfd_vma
) -2
5081 && ! GOT_TLS_GDESC_P (tls_type
))
5083 if (r_type
== R_386_TLS_GOTDESC
5084 || r_type
== R_386_TLS_DESC_CALL
)
5086 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
5087 unresolved_reloc
= FALSE
;
5089 else if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5091 bfd_vma g_o_t
= htab
->elf
.sgotplt
->output_section
->vma
5092 + htab
->elf
.sgotplt
->output_offset
;
5093 relocation
= htab
->elf
.sgot
->output_section
->vma
5094 + htab
->elf
.sgot
->output_offset
+ off
- g_o_t
;
5095 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
5096 && tls_type
== GOT_TLS_IE_BOTH
)
5098 if (r_type
== R_386_TLS_IE
)
5099 relocation
+= g_o_t
;
5100 unresolved_reloc
= FALSE
;
5102 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
5104 unsigned int val
, type
;
5107 /* GD->IE transition. */
5108 type
= *(contents
+ rel
->r_offset
- 2);
5109 val
= *(contents
+ rel
->r_offset
- 1);
5113 leal foo@tlsgd(,%ebx,1), %eax
5114 call ___tls_get_addr@PLT
5117 subl $foo@gottpoff(%ebx), %eax. */
5119 roff
= rel
->r_offset
- 3;
5124 leal foo@tlsgd(%ebx), %eax
5125 call ___tls_get_addr@PLT
5128 leal foo@tlsgd(%reg), %eax
5129 call *___tls_get_addr@GOT(%reg)
5130 which may be converted to
5131 addr32 call ___tls_get_addr
5134 subl $foo@gottpoff(%reg), %eax. */
5135 roff
= rel
->r_offset
- 2;
5137 memcpy (contents
+ roff
,
5138 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
5139 contents
[roff
+ 7] = 0x80 | (val
& 7);
5140 /* If foo is used only with foo@gotntpoff(%reg) and
5141 foo@indntpoff, but not with foo@gottpoff(%reg), change
5142 subl $foo@gottpoff(%reg), %eax
5144 addl $foo@gotntpoff(%reg), %eax. */
5145 if (tls_type
== GOT_TLS_IE_POS
)
5146 contents
[roff
+ 6] = 0x03;
5147 bfd_put_32 (output_bfd
,
5148 htab
->elf
.sgot
->output_section
->vma
5149 + htab
->elf
.sgot
->output_offset
+ off
5150 - htab
->elf
.sgotplt
->output_section
->vma
5151 - htab
->elf
.sgotplt
->output_offset
,
5152 contents
+ roff
+ 8);
5153 /* Skip R_386_PLT32 and R_386_GOT32X. */
5158 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
5160 /* GDesc -> IE transition.
5161 It's originally something like:
5162 leal x@tlsdesc(%ebx), %eax
5165 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
5167 movl x@gottpoff(%ebx), %eax # before negl %eax
5169 Registers other than %eax may be set up here. */
5173 /* First, make sure it's a leal adding ebx to a 32-bit
5174 offset into any register, although it's probably
5175 almost always going to be eax. */
5176 roff
= rel
->r_offset
;
5178 /* Now modify the instruction as appropriate. */
5179 /* To turn a leal into a movl in the form we use it, it
5180 suffices to change the first byte from 0x8d to 0x8b.
5181 aoliva FIXME: should we decide to keep the leal, all
5182 we have to do is remove the statement below, and
5183 adjust the relaxation of R_386_TLS_DESC_CALL. */
5184 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5186 if (tls_type
== GOT_TLS_IE_BOTH
)
5189 bfd_put_32 (output_bfd
,
5190 htab
->elf
.sgot
->output_section
->vma
5191 + htab
->elf
.sgot
->output_offset
+ off
5192 - htab
->elf
.sgotplt
->output_section
->vma
5193 - htab
->elf
.sgotplt
->output_offset
,
5197 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
5199 /* GDesc -> IE transition.
5207 depending on how we transformed the TLS_GOTDESC above.
5212 roff
= rel
->r_offset
;
5214 /* Now modify the instruction as appropriate. */
5215 if (tls_type
!= GOT_TLS_IE_NEG
)
5218 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5219 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5224 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
5225 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
5235 if (! elf_i386_tls_transition (info
, input_bfd
,
5236 input_section
, contents
,
5237 symtab_hdr
, sym_hashes
,
5238 &r_type
, GOT_UNKNOWN
, rel
,
5239 relend
, h
, r_symndx
, TRUE
))
5242 if (r_type
!= R_386_TLS_LDM
)
5244 /* LD->LE transition. Change
5245 leal foo@tlsldm(%ebx) %eax
5246 call ___tls_get_addr@PLT
5250 leal 0(%esi,1), %esi
5252 leal foo@tlsldm(%reg) %eax
5253 call *___tls_get_addr@GOT(%reg)
5254 which may be converted to
5255 addr32 call ___tls_get_addr
5258 leal 0(%esi), %esi */
5259 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
5260 if (*(contents
+ rel
->r_offset
+ 4) == 0xff
5261 || *(contents
+ rel
->r_offset
+ 4) == 0x67)
5262 memcpy (contents
+ rel
->r_offset
- 2,
5263 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5265 memcpy (contents
+ rel
->r_offset
- 2,
5266 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5267 /* Skip R_386_PC32/R_386_PLT32. */
5273 if (htab
->elf
.sgot
== NULL
)
5276 off
= htab
->tls_ldm_got
.offset
;
5281 Elf_Internal_Rela outrel
;
5283 if (htab
->elf
.srelgot
== NULL
)
5286 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5287 + htab
->elf
.sgot
->output_offset
+ off
);
5289 bfd_put_32 (output_bfd
, 0,
5290 htab
->elf
.sgot
->contents
+ off
);
5291 bfd_put_32 (output_bfd
, 0,
5292 htab
->elf
.sgot
->contents
+ off
+ 4);
5293 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
5294 elf_append_rel (output_bfd
, htab
->elf
.srelgot
, &outrel
);
5295 htab
->tls_ldm_got
.offset
|= 1;
5297 relocation
= htab
->elf
.sgot
->output_section
->vma
5298 + htab
->elf
.sgot
->output_offset
+ off
5299 - htab
->elf
.sgotplt
->output_section
->vma
5300 - htab
->elf
.sgotplt
->output_offset
;
5301 unresolved_reloc
= FALSE
;
5304 case R_386_TLS_LDO_32
:
5305 if (!bfd_link_executable (info
)
5306 || (input_section
->flags
& SEC_CODE
) == 0)
5307 relocation
-= elf_i386_dtpoff_base (info
);
5309 /* When converting LDO to LE, we must negate. */
5310 relocation
= -elf_i386_tpoff (info
, relocation
);
5313 case R_386_TLS_LE_32
:
5315 if (!bfd_link_executable (info
))
5317 Elf_Internal_Rela outrel
;
5320 outrel
.r_offset
= rel
->r_offset
5321 + input_section
->output_section
->vma
5322 + input_section
->output_offset
;
5323 if (h
!= NULL
&& h
->dynindx
!= -1)
5327 if (r_type
== R_386_TLS_LE_32
)
5328 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
5330 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
5331 sreloc
= elf_section_data (input_section
)->sreloc
;
5334 elf_append_rel (output_bfd
, sreloc
, &outrel
);
5337 else if (r_type
== R_386_TLS_LE_32
)
5338 relocation
= elf_i386_dtpoff_base (info
) - relocation
;
5340 relocation
-= elf_i386_dtpoff_base (info
);
5342 else if (r_type
== R_386_TLS_LE_32
)
5343 relocation
= elf_i386_tpoff (info
, relocation
);
5345 relocation
= -elf_i386_tpoff (info
, relocation
);
5352 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5353 because such sections are not SEC_ALLOC and thus ld.so will
5354 not process them. */
5355 if (unresolved_reloc
5356 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5358 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5359 rel
->r_offset
) != (bfd_vma
) -1)
5362 /* xgettext:c-format */
5363 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
5368 h
->root
.root
.string
);
5373 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5374 contents
, rel
->r_offset
,
5377 check_relocation_error
:
5378 if (r
!= bfd_reloc_ok
)
5383 name
= h
->root
.root
.string
;
5386 name
= bfd_elf_string_from_elf_section (input_bfd
,
5387 symtab_hdr
->sh_link
,
5392 name
= bfd_section_name (input_bfd
, sec
);
5395 if (r
== bfd_reloc_overflow
)
5396 (*info
->callbacks
->reloc_overflow
)
5397 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5398 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
5402 /* xgettext:c-format */
5403 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
5404 input_bfd
, input_section
,
5405 rel
->r_offset
, name
, (int) r
);
5416 Elf_Internal_Shdr
*rel_hdr
;
5417 size_t deleted
= rel
- wrel
;
5419 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5420 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5421 if (rel_hdr
->sh_size
== 0)
5423 /* It is too late to remove an empty reloc section. Leave
5425 ??? What is wrong with an empty section??? */
5426 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5429 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5430 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5431 input_section
->reloc_count
-= deleted
;
5437 /* Finish up dynamic symbol handling. We set the contents of various
5438 dynamic sections here. */
5441 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
5442 struct bfd_link_info
*info
,
5443 struct elf_link_hash_entry
*h
,
5444 Elf_Internal_Sym
*sym
)
5446 struct elf_i386_link_hash_table
*htab
;
5447 unsigned plt_entry_size
;
5448 const struct elf_i386_backend_data
*abed
;
5449 struct elf_i386_link_hash_entry
*eh
;
5450 bfd_boolean local_undefweak
;
5451 bfd_boolean use_plt_second
;
5453 htab
= elf_i386_hash_table (info
);
5457 abed
= get_elf_i386_backend_data (output_bfd
);
5458 plt_entry_size
= htab
->plt
.plt_entry_size
;
5460 /* Use the second PLT section only if there is .plt section. */
5461 use_plt_second
= htab
->elf
.splt
!= NULL
&& htab
->plt_second
!= NULL
;
5463 eh
= (struct elf_i386_link_hash_entry
*) h
;
5464 if (eh
->no_finish_dynamic_symbol
)
5467 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5468 resolved undefined weak symbols in executable so that their
5469 references have value 0 at run-time. */
5470 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
5474 if (h
->plt
.offset
!= (bfd_vma
) -1)
5476 bfd_vma plt_index
, plt_offset
;
5478 Elf_Internal_Rela rel
;
5480 asection
*plt
, *resolved_plt
, *gotplt
, *relplt
;
5482 /* When building a static executable, use .iplt, .igot.plt and
5483 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5484 if (htab
->elf
.splt
!= NULL
)
5486 plt
= htab
->elf
.splt
;
5487 gotplt
= htab
->elf
.sgotplt
;
5488 relplt
= htab
->elf
.srelplt
;
5492 plt
= htab
->elf
.iplt
;
5493 gotplt
= htab
->elf
.igotplt
;
5494 relplt
= htab
->elf
.irelplt
;
5497 /* This symbol has an entry in the procedure linkage table. Set
5500 if ((h
->dynindx
== -1
5502 && !((h
->forced_local
|| bfd_link_executable (info
))
5504 && h
->type
== STT_GNU_IFUNC
))
5510 /* Get the index in the procedure linkage table which
5511 corresponds to this symbol. This is the index of this symbol
5512 in all the symbols for which we are making plt entries. The
5513 first entry in the procedure linkage table is reserved.
5515 Get the offset into the .got table of the entry that
5516 corresponds to this function. Each .got entry is 4 bytes.
5517 The first three are reserved.
5519 For static executables, we don't reserve anything. */
5521 if (plt
== htab
->elf
.splt
)
5523 got_offset
= (h
->plt
.offset
/ plt_entry_size
5524 - htab
->plt
.has_plt0
);
5525 got_offset
= (got_offset
+ 3) * 4;
5529 got_offset
= h
->plt
.offset
/ plt_entry_size
;
5530 got_offset
= got_offset
* 4;
5533 /* Fill in the entry in the procedure linkage table and update
5535 memcpy (plt
->contents
+ h
->plt
.offset
, htab
->plt
.plt_entry
,
5540 const bfd_byte
*plt_entry
;
5541 if (bfd_link_pic (info
))
5542 plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
5544 plt_entry
= htab
->non_lazy_plt
->plt_entry
;
5545 memcpy (htab
->plt_second
->contents
+ eh
->plt_second
.offset
,
5546 plt_entry
, htab
->non_lazy_plt
->plt_entry_size
);
5548 resolved_plt
= htab
->plt_second
;
5549 plt_offset
= eh
->plt_second
.offset
;
5554 plt_offset
= h
->plt
.offset
;
5557 if (! bfd_link_pic (info
))
5559 bfd_put_32 (output_bfd
,
5560 (gotplt
->output_section
->vma
5561 + gotplt
->output_offset
5563 resolved_plt
->contents
+ plt_offset
5564 + htab
->plt
.plt_got_offset
);
5566 if (abed
->os
== is_vxworks
)
5568 int s
, k
, reloc_index
;
5570 /* Create the R_386_32 relocation referencing the GOT
5571 for this PLT entry. */
5573 /* S: Current slot number (zero-based). */
5574 s
= ((h
->plt
.offset
- htab
->plt
.plt_entry_size
)
5575 / htab
->plt
.plt_entry_size
);
5576 /* K: Number of relocations for PLTResolve. */
5577 if (bfd_link_pic (info
))
5578 k
= PLTRESOLVE_RELOCS_SHLIB
;
5580 k
= PLTRESOLVE_RELOCS
;
5581 /* Skip the PLTresolve relocations, and the relocations for
5582 the other PLT slots. */
5583 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
5584 loc
= (htab
->srelplt2
->contents
+ reloc_index
5585 * sizeof (Elf32_External_Rel
));
5587 rel
.r_offset
= (plt
->output_section
->vma
5588 + plt
->output_offset
5589 + h
->plt
.offset
+ 2),
5590 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
5591 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
5593 /* Create the R_386_32 relocation referencing the beginning of
5594 the PLT for this GOT entry. */
5595 rel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
5596 + htab
->elf
.sgotplt
->output_offset
5598 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
5599 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
5600 loc
+ sizeof (Elf32_External_Rel
));
5605 bfd_put_32 (output_bfd
, got_offset
,
5606 resolved_plt
->contents
+ plt_offset
5607 + htab
->plt
.plt_got_offset
);
5610 /* Fill in the entry in the global offset table. Leave the entry
5611 as zero for undefined weak symbol in PIE. No PLT relocation
5612 against undefined weak symbol in PIE. */
5613 if (!local_undefweak
)
5615 if (htab
->plt
.has_plt0
)
5616 bfd_put_32 (output_bfd
,
5617 (plt
->output_section
->vma
5618 + plt
->output_offset
5620 + htab
->lazy_plt
->plt_lazy_offset
),
5621 gotplt
->contents
+ got_offset
);
5623 /* Fill in the entry in the .rel.plt section. */
5624 rel
.r_offset
= (gotplt
->output_section
->vma
5625 + gotplt
->output_offset
5627 if (h
->dynindx
== -1
5628 || ((bfd_link_executable (info
)
5629 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5631 && h
->type
== STT_GNU_IFUNC
))
5633 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
5634 h
->root
.root
.string
,
5635 h
->root
.u
.def
.section
->owner
);
5637 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5638 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5639 in the .got.plt section. */
5640 bfd_put_32 (output_bfd
,
5641 (h
->root
.u
.def
.value
5642 + h
->root
.u
.def
.section
->output_section
->vma
5643 + h
->root
.u
.def
.section
->output_offset
),
5644 gotplt
->contents
+ got_offset
);
5645 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
5646 /* R_386_IRELATIVE comes last. */
5647 plt_index
= htab
->next_irelative_index
--;
5651 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
5652 plt_index
= htab
->next_jump_slot_index
++;
5655 loc
= relplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
5656 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
5658 /* Don't fill the second and third slots in PLT entry for
5659 static executables nor without PLT0. */
5660 if (plt
== htab
->elf
.splt
&& htab
->plt
.has_plt0
)
5662 bfd_put_32 (output_bfd
,
5663 plt_index
* sizeof (Elf32_External_Rel
),
5664 plt
->contents
+ h
->plt
.offset
5665 + htab
->lazy_plt
->plt_reloc_offset
);
5666 bfd_put_32 (output_bfd
,
5668 + htab
->lazy_plt
->plt_plt_offset
+ 4),
5669 (plt
->contents
+ h
->plt
.offset
5670 + htab
->lazy_plt
->plt_plt_offset
));
5674 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5676 bfd_vma got_offset
, plt_offset
;
5677 asection
*plt
, *got
, *gotplt
;
5678 const bfd_byte
*got_plt_entry
;
5680 /* Set the entry in the GOT procedure linkage table. */
5681 plt
= htab
->plt_got
;
5682 got
= htab
->elf
.sgot
;
5683 gotplt
= htab
->elf
.sgotplt
;
5684 got_offset
= h
->got
.offset
;
5686 if (got_offset
== (bfd_vma
) -1
5692 /* Fill in the entry in the GOT procedure linkage table. */
5693 if (! bfd_link_pic (info
))
5695 got_plt_entry
= htab
->non_lazy_plt
->plt_entry
;
5696 got_offset
+= got
->output_section
->vma
+ got
->output_offset
;
5700 got_plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
5701 got_offset
+= (got
->output_section
->vma
5702 + got
->output_offset
5703 - gotplt
->output_section
->vma
5704 - gotplt
->output_offset
);
5707 plt_offset
= eh
->plt_got
.offset
;
5708 memcpy (plt
->contents
+ plt_offset
, got_plt_entry
,
5709 htab
->non_lazy_plt
->plt_entry_size
);
5710 bfd_put_32 (output_bfd
, got_offset
,
5711 (plt
->contents
+ plt_offset
5712 + htab
->non_lazy_plt
->plt_got_offset
));
5715 if (!local_undefweak
5717 && (h
->plt
.offset
!= (bfd_vma
) -1
5718 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5720 /* Mark the symbol as undefined, rather than as defined in
5721 the .plt section. Leave the value if there were any
5722 relocations where pointer equality matters (this is a clue
5723 for the dynamic linker, to make function pointer
5724 comparisons work between an application and shared
5725 library), otherwise set it to zero. If a function is only
5726 called from a binary, there is no need to slow down
5727 shared libraries because of that. */
5728 sym
->st_shndx
= SHN_UNDEF
;
5729 if (!h
->pointer_equality_needed
)
5733 /* Don't generate dynamic GOT relocation against undefined weak
5734 symbol in executable. */
5735 if (h
->got
.offset
!= (bfd_vma
) -1
5736 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h
)->tls_type
)
5737 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0
5738 && !local_undefweak
)
5740 Elf_Internal_Rela rel
;
5741 asection
*relgot
= htab
->elf
.srelgot
;
5743 /* This symbol has an entry in the global offset table. Set it
5746 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5749 rel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5750 + htab
->elf
.sgot
->output_offset
5751 + (h
->got
.offset
& ~(bfd_vma
) 1));
5753 /* If this is a static link, or it is a -Bsymbolic link and the
5754 symbol is defined locally or was forced to be local because
5755 of a version file, we just want to emit a RELATIVE reloc.
5756 The entry in the global offset table will already have been
5757 initialized in the relocate_section function. */
5759 && h
->type
== STT_GNU_IFUNC
)
5761 if (h
->plt
.offset
== (bfd_vma
) -1)
5763 /* STT_GNU_IFUNC is referenced without PLT. */
5764 if (htab
->elf
.splt
== NULL
)
5766 /* use .rel[a].iplt section to store .got relocations
5767 in static executable. */
5768 relgot
= htab
->elf
.irelplt
;
5770 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
5772 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
5773 h
->root
.root
.string
,
5774 h
->root
.u
.def
.section
->owner
);
5776 bfd_put_32 (output_bfd
,
5777 (h
->root
.u
.def
.value
5778 + h
->root
.u
.def
.section
->output_section
->vma
5779 + h
->root
.u
.def
.section
->output_offset
),
5780 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5781 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
5786 else if (bfd_link_pic (info
))
5788 /* Generate R_386_GLOB_DAT. */
5796 if (!h
->pointer_equality_needed
)
5799 /* For non-shared object, we can't use .got.plt, which
5800 contains the real function addres if we need pointer
5801 equality. We load the GOT entry with the PLT entry. */
5802 if (htab
->plt_second
!= NULL
)
5804 plt
= htab
->plt_second
;
5805 plt_offset
= eh
->plt_second
.offset
;
5809 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5810 plt_offset
= h
->plt
.offset
;
5812 bfd_put_32 (output_bfd
,
5813 (plt
->output_section
->vma
5814 + plt
->output_offset
+ plt_offset
),
5815 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5819 else if (bfd_link_pic (info
)
5820 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5822 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5823 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
5827 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5829 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
5830 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5831 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
5834 elf_append_rel (output_bfd
, relgot
, &rel
);
5839 Elf_Internal_Rela rel
;
5842 /* This symbol needs a copy reloc. Set it up. */
5844 if (h
->dynindx
== -1
5845 || (h
->root
.type
!= bfd_link_hash_defined
5846 && h
->root
.type
!= bfd_link_hash_defweak
)
5847 || htab
->elf
.srelbss
== NULL
5848 || htab
->elf
.sreldynrelro
== NULL
)
5851 rel
.r_offset
= (h
->root
.u
.def
.value
5852 + h
->root
.u
.def
.section
->output_section
->vma
5853 + h
->root
.u
.def
.section
->output_offset
);
5854 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
5855 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
5856 s
= htab
->elf
.sreldynrelro
;
5858 s
= htab
->elf
.srelbss
;
5859 elf_append_rel (output_bfd
, s
, &rel
);
5865 /* Finish up local dynamic symbol handling. We set the contents of
5866 various dynamic sections here. */
5869 elf_i386_finish_local_dynamic_symbol (void **slot
, void *inf
)
5871 struct elf_link_hash_entry
*h
5872 = (struct elf_link_hash_entry
*) *slot
;
5873 struct bfd_link_info
*info
5874 = (struct bfd_link_info
*) inf
;
5876 return elf_i386_finish_dynamic_symbol (info
->output_bfd
, info
,
5880 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5881 here since undefined weak symbol may not be dynamic and may not be
5882 called for elf_i386_finish_dynamic_symbol. */
5885 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
5888 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
5889 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
5891 if (h
->root
.type
!= bfd_link_hash_undefweak
5892 || h
->dynindx
!= -1)
5895 return elf_i386_finish_dynamic_symbol (info
->output_bfd
,
5899 /* Used to decide how to sort relocs in an optimal manner for the
5900 dynamic linker, before writing them out. */
5902 static enum elf_reloc_type_class
5903 elf_i386_reloc_type_class (const struct bfd_link_info
*info
,
5904 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5905 const Elf_Internal_Rela
*rela
)
5907 bfd
*abfd
= info
->output_bfd
;
5908 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5909 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
5911 if (htab
->dynsym
!= NULL
5912 && htab
->dynsym
->contents
!= NULL
)
5914 /* Check relocation against STT_GNU_IFUNC symbol if there are
5916 unsigned long r_symndx
= ELF32_R_SYM (rela
->r_info
);
5917 if (r_symndx
!= STN_UNDEF
)
5919 Elf_Internal_Sym sym
;
5920 if (!bed
->s
->swap_symbol_in (abfd
,
5921 (htab
->dynsym
->contents
5922 + r_symndx
* sizeof (Elf32_External_Sym
)),
5926 if (ELF32_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5927 return reloc_class_ifunc
;
5931 switch (ELF32_R_TYPE (rela
->r_info
))
5933 case R_386_IRELATIVE
:
5934 return reloc_class_ifunc
;
5935 case R_386_RELATIVE
:
5936 return reloc_class_relative
;
5937 case R_386_JUMP_SLOT
:
5938 return reloc_class_plt
;
5940 return reloc_class_copy
;
5942 return reloc_class_normal
;
5946 /* Finish up the dynamic sections. */
5949 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
5950 struct bfd_link_info
*info
)
5952 struct elf_i386_link_hash_table
*htab
;
5955 const struct elf_i386_backend_data
*abed
;
5957 htab
= elf_i386_hash_table (info
);
5961 dynobj
= htab
->elf
.dynobj
;
5962 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5963 abed
= get_elf_i386_backend_data (output_bfd
);
5965 if (htab
->elf
.dynamic_sections_created
)
5967 Elf32_External_Dyn
*dyncon
, *dynconend
;
5969 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5972 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
5973 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
5974 for (; dyncon
< dynconend
; dyncon
++)
5976 Elf_Internal_Dyn dyn
;
5979 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5984 if (abed
->os
== is_vxworks
5985 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
5990 s
= htab
->elf
.sgotplt
;
5991 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5995 s
= htab
->elf
.srelplt
;
5996 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
6000 s
= htab
->elf
.srelplt
;
6001 dyn
.d_un
.d_val
= s
->size
;
6005 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
6008 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
6010 /* UnixWare sets the entsize of .plt to 4, although that doesn't
6011 really seem like the right value. */
6012 elf_section_data (htab
->elf
.splt
->output_section
)
6013 ->this_hdr
.sh_entsize
= 4;
6015 if (htab
->plt
.has_plt0
)
6017 /* Fill in the special first entry in the procedure linkage
6019 memcpy (htab
->elf
.splt
->contents
, htab
->plt
.plt0_entry
,
6020 htab
->lazy_plt
->plt0_entry_size
);
6021 memset (htab
->elf
.splt
->contents
+ htab
->lazy_plt
->plt0_entry_size
,
6022 abed
->plt0_pad_byte
,
6023 htab
->plt
.plt_entry_size
- htab
->lazy_plt
->plt0_entry_size
);
6024 if (!bfd_link_pic (info
))
6026 bfd_put_32 (output_bfd
,
6027 (htab
->elf
.sgotplt
->output_section
->vma
6028 + htab
->elf
.sgotplt
->output_offset
6030 htab
->elf
.splt
->contents
6031 + htab
->lazy_plt
->plt0_got1_offset
);
6032 bfd_put_32 (output_bfd
,
6033 (htab
->elf
.sgotplt
->output_section
->vma
6034 + htab
->elf
.sgotplt
->output_offset
6036 htab
->elf
.splt
->contents
6037 + htab
->lazy_plt
->plt0_got2_offset
);
6039 if (abed
->os
== is_vxworks
)
6041 Elf_Internal_Rela rel
;
6042 int num_plts
= (htab
->elf
.splt
->size
6043 / htab
->plt
.plt_entry_size
) - 1;
6046 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
6047 + 4. On IA32 we use REL relocations so the
6048 addend goes in the PLT directly. */
6049 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
6050 + htab
->elf
.splt
->output_offset
6051 + htab
->lazy_plt
->plt0_got1_offset
);
6052 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
6054 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
6055 htab
->srelplt2
->contents
);
6056 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
6058 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
6059 + htab
->elf
.splt
->output_offset
6060 + htab
->lazy_plt
->plt0_got2_offset
);
6061 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
6063 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
6064 htab
->srelplt2
->contents
+
6065 sizeof (Elf32_External_Rel
));
6066 /* Correct the .rel.plt.unloaded relocations. */
6067 p
= htab
->srelplt2
->contents
;
6068 if (bfd_link_pic (info
))
6069 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
6071 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
6073 for (; num_plts
; num_plts
--)
6075 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
6076 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
6078 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
6079 p
+= sizeof (Elf32_External_Rel
);
6081 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
6082 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
,
6084 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
6085 p
+= sizeof (Elf32_External_Rel
);
6092 if (htab
->plt_got
!= NULL
&& htab
->plt_got
->size
> 0)
6093 elf_section_data (htab
->plt_got
->output_section
)
6094 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
6096 if (htab
->plt_second
!= NULL
&& htab
->plt_second
->size
> 0)
6097 elf_section_data (htab
->plt_second
->output_section
)
6098 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
6101 /* Fill in the first three entries in the global offset table. */
6102 if (htab
->elf
.sgotplt
&& htab
->elf
.sgotplt
->size
> 0)
6104 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
6107 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
6111 bfd_put_32 (output_bfd
,
6113 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
6114 htab
->elf
.sgotplt
->contents
);
6115 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 4);
6116 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 8);
6118 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
6121 /* Adjust .eh_frame for .plt section. */
6122 if (htab
->plt_eh_frame
!= NULL
6123 && htab
->plt_eh_frame
->contents
!= NULL
)
6125 if (htab
->elf
.splt
!= NULL
6126 && htab
->elf
.splt
->size
!= 0
6127 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
6128 && htab
->elf
.splt
->output_section
!= NULL
6129 && htab
->plt_eh_frame
->output_section
!= NULL
)
6131 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
6132 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
6133 + htab
->plt_eh_frame
->output_offset
6134 + PLT_FDE_START_OFFSET
;
6135 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6136 htab
->plt_eh_frame
->contents
6137 + PLT_FDE_START_OFFSET
);
6139 if (htab
->plt_eh_frame
->sec_info_type
6140 == SEC_INFO_TYPE_EH_FRAME
)
6142 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6144 htab
->plt_eh_frame
->contents
))
6149 /* Adjust .eh_frame for .plt.got section. */
6150 if (htab
->plt_got_eh_frame
!= NULL
6151 && htab
->plt_got_eh_frame
->contents
!= NULL
)
6153 if (htab
->plt_got
!= NULL
6154 && htab
->plt_got
->size
!= 0
6155 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
6156 && htab
->plt_got
->output_section
!= NULL
6157 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
6159 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
6160 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
6161 + htab
->plt_got_eh_frame
->output_offset
6162 + PLT_FDE_START_OFFSET
;
6163 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6164 htab
->plt_got_eh_frame
->contents
6165 + PLT_FDE_START_OFFSET
);
6167 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6169 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6170 htab
->plt_got_eh_frame
,
6171 htab
->plt_got_eh_frame
->contents
))
6176 /* Adjust .eh_frame for the second PLT section. */
6177 if (htab
->plt_second_eh_frame
!= NULL
6178 && htab
->plt_second_eh_frame
->contents
!= NULL
)
6180 if (htab
->plt_second
!= NULL
6181 && htab
->plt_second
->size
!= 0
6182 && (htab
->plt_second
->flags
& SEC_EXCLUDE
) == 0
6183 && htab
->plt_second
->output_section
!= NULL
6184 && htab
->plt_second_eh_frame
->output_section
!= NULL
)
6186 bfd_vma plt_start
= htab
->plt_second
->output_section
->vma
;
6187 bfd_vma eh_frame_start
6188 = (htab
->plt_second_eh_frame
->output_section
->vma
6189 + htab
->plt_second_eh_frame
->output_offset
6190 + PLT_FDE_START_OFFSET
);
6191 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6192 htab
->plt_second_eh_frame
->contents
6193 + PLT_FDE_START_OFFSET
);
6195 if (htab
->plt_second_eh_frame
->sec_info_type
6196 == SEC_INFO_TYPE_EH_FRAME
)
6198 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6199 htab
->plt_second_eh_frame
,
6200 htab
->plt_second_eh_frame
->contents
))
6205 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
6206 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
6208 /* Fill PLT entries for undefined weak symbols in PIE. */
6209 if (bfd_link_pie (info
))
6210 bfd_hash_traverse (&info
->hash
->table
,
6211 elf_i386_pie_finish_undefweak_symbol
,
6217 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6218 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6219 It has to be done before elf_link_sort_relocs is called so that
6220 dynamic relocations are properly sorted. */
6223 elf_i386_output_arch_local_syms
6224 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
6225 struct bfd_link_info
*info
,
6226 void *flaginfo ATTRIBUTE_UNUSED
,
6227 int (*func
) (void *, const char *,
6230 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
6232 struct elf_i386_link_hash_table
*htab
= elf_i386_hash_table (info
);
6236 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6237 htab_traverse (htab
->loc_hash_table
,
6238 elf_i386_finish_local_dynamic_symbol
,
6244 /* Sort relocs into address order. */
6247 compare_relocs (const void *ap
, const void *bp
)
6249 const arelent
*a
= * (const arelent
**) ap
;
6250 const arelent
*b
= * (const arelent
**) bp
;
6252 if (a
->address
> b
->address
)
6254 else if (a
->address
< b
->address
)
6260 enum elf_i386_plt_type
6265 plt_second
= 1 << 2,
6274 enum elf_i386_plt_type type
;
6275 unsigned int plt_got_offset
;
6276 unsigned int plt_entry_size
;
6280 /* Forward declaration. */
6281 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt
;
6283 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6284 dynamic relocations. */
6287 elf_i386_get_synthetic_symtab (bfd
*abfd
,
6288 long symcount ATTRIBUTE_UNUSED
,
6289 asymbol
**syms ATTRIBUTE_UNUSED
,
6294 long size
, count
, i
, n
, len
;
6296 unsigned int plt_got_offset
, plt_entry_size
;
6298 bfd_byte
*plt_contents
;
6299 long dynrelcount
, relsize
;
6300 arelent
**dynrelbuf
, *p
;
6301 const struct elf_i386_lazy_plt_layout
*lazy_plt
;
6302 const struct elf_i386_non_lazy_plt_layout
*non_lazy_plt
;
6303 const struct elf_i386_lazy_plt_layout
*lazy_ibt_plt
;
6304 const struct elf_i386_non_lazy_plt_layout
*non_lazy_ibt_plt
;
6308 enum elf_i386_plt_type plt_type
;
6309 struct elf_i386_plt plts
[] =
6311 { ".plt", NULL
, NULL
, plt_unknown
, 0, 0, 0 },
6312 { ".plt.got", NULL
, NULL
, plt_non_lazy
, 0, 0, 0 },
6313 { ".plt.sec", NULL
, NULL
, plt_second
, 0, 0, 0 },
6314 { NULL
, NULL
, NULL
, plt_non_lazy
, 0, 0, 0 }
6319 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
6322 if (dynsymcount
<= 0)
6325 relsize
= bfd_get_dynamic_reloc_upper_bound (abfd
);
6329 dynrelbuf
= (arelent
**) bfd_malloc (relsize
);
6330 if (dynrelbuf
== NULL
)
6333 dynrelcount
= bfd_canonicalize_dynamic_reloc (abfd
, dynrelbuf
,
6336 /* Sort the relocs by address. */
6337 qsort (dynrelbuf
, dynrelcount
, sizeof (arelent
*), compare_relocs
);
6339 non_lazy_plt
= NULL
;
6340 /* Silence GCC 6. */
6342 non_lazy_ibt_plt
= NULL
;
6343 lazy_ibt_plt
= NULL
;
6344 switch (get_elf_i386_backend_data (abfd
)->os
)
6347 non_lazy_plt
= &elf_i386_non_lazy_plt
;
6348 lazy_ibt_plt
= &elf_i386_lazy_ibt_plt
;
6349 non_lazy_ibt_plt
= &elf_i386_non_lazy_ibt_plt
;
6352 lazy_plt
= &elf_i386_lazy_plt
;
6355 lazy_plt
= &elf_i386_nacl_plt
;
6362 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
6364 plt
= bfd_get_section_by_name (abfd
, plts
[j
].name
);
6365 if (plt
== NULL
|| plt
->size
== 0)
6368 /* Get the PLT section contents. */
6369 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6370 if (plt_contents
== NULL
)
6372 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6373 plt_contents
, 0, plt
->size
))
6375 free (plt_contents
);
6379 /* Check what kind of PLT it is. */
6380 plt_type
= plt_unknown
;
6381 if (plts
[j
].type
== plt_unknown
6382 && (plt
->size
>= (lazy_plt
->plt0_entry_size
6383 + lazy_plt
->plt_entry_size
)))
6385 /* Match lazy PLT first. */
6386 if (memcmp (plt_contents
, lazy_plt
->plt0_entry
,
6387 lazy_plt
->plt0_got1_offset
) == 0)
6389 /* The fist entry in the lazy IBT PLT is the same as the
6391 if (lazy_ibt_plt
!= NULL
6392 && (memcmp (plt_contents
+ lazy_ibt_plt
->plt0_entry_size
,
6393 lazy_ibt_plt
->plt_entry
,
6394 lazy_ibt_plt
->plt_got_offset
) == 0))
6395 plt_type
= plt_lazy
| plt_second
;
6397 plt_type
= plt_lazy
;
6399 else if (memcmp (plt_contents
, lazy_plt
->pic_plt0_entry
,
6400 lazy_plt
->plt0_got1_offset
) == 0)
6402 /* The fist entry in the PIC lazy IBT PLT is the same as
6403 the normal PIC lazy PLT. */
6404 if (lazy_ibt_plt
!= NULL
6405 && (memcmp (plt_contents
+ lazy_ibt_plt
->plt0_entry_size
,
6406 lazy_ibt_plt
->pic_plt_entry
,
6407 lazy_ibt_plt
->plt_got_offset
) == 0))
6408 plt_type
= plt_lazy
| plt_pic
| plt_second
;
6410 plt_type
= plt_lazy
| plt_pic
;
6414 if (non_lazy_plt
!= NULL
6415 && (plt_type
== plt_unknown
|| plt_type
== plt_non_lazy
)
6416 && plt
->size
>= non_lazy_plt
->plt_entry_size
)
6418 /* Match non-lazy PLT. */
6419 if (memcmp (plt_contents
, non_lazy_plt
->plt_entry
,
6420 non_lazy_plt
->plt_got_offset
) == 0)
6421 plt_type
= plt_non_lazy
;
6422 else if (memcmp (plt_contents
, non_lazy_plt
->pic_plt_entry
,
6423 non_lazy_plt
->plt_got_offset
) == 0)
6427 if ((non_lazy_ibt_plt
!= NULL
)
6428 && (plt_type
== plt_unknown
|| plt_type
== plt_second
)
6429 && plt
->size
>= non_lazy_ibt_plt
->plt_entry_size
)
6431 if (memcmp (plt_contents
,
6432 non_lazy_ibt_plt
->plt_entry
,
6433 non_lazy_ibt_plt
->plt_got_offset
) == 0)
6435 /* Match IBT PLT. */
6436 plt_type
= plt_second
;
6437 non_lazy_plt
= non_lazy_ibt_plt
;
6439 else if (memcmp (plt_contents
,
6440 non_lazy_ibt_plt
->pic_plt_entry
,
6441 non_lazy_ibt_plt
->plt_got_offset
) == 0)
6443 /* Match PIC IBT PLT. */
6444 plt_type
= plt_second
| plt_pic
;
6445 non_lazy_plt
= non_lazy_ibt_plt
;
6449 if (plt_type
== plt_unknown
)
6453 plts
[j
].type
= plt_type
;
6455 if ((plt_type
& plt_lazy
))
6457 plts
[j
].plt_got_offset
= lazy_plt
->plt_got_offset
;
6458 plts
[j
].plt_entry_size
= lazy_plt
->plt_entry_size
;
6459 /* Skip PLT0 in lazy PLT. */
6464 plts
[j
].plt_got_offset
= non_lazy_plt
->plt_got_offset
;
6465 plts
[j
].plt_entry_size
= non_lazy_plt
->plt_entry_size
;
6469 /* Skip lazy PLT when the second PLT is used. */
6470 if ((plt_type
& (plt_lazy
| plt_second
))
6471 == (plt_lazy
| plt_second
))
6475 n
= plt
->size
/ plts
[j
].plt_entry_size
;
6480 plts
[j
].contents
= plt_contents
;
6482 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
6483 if ((plt_type
& plt_pic
))
6484 got_addr
= (bfd_vma
) -1;
6490 size
= count
* sizeof (asymbol
);
6492 /* Allocate space for @plt suffixes. */
6494 for (i
= 0; i
< dynrelcount
; i
++)
6497 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
6499 size
+= sizeof ("+0x") - 1 + 8;
6502 s
= *ret
= (asymbol
*) bfd_zmalloc (size
);
6506 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
6507 if (plts
[j
].contents
!= NULL
)
6508 free (plts
[j
].contents
);
6515 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
6517 asection
*sec
= bfd_get_section_by_name (abfd
, ".got.plt");
6519 got_addr
= sec
->vma
;
6522 sec
= bfd_get_section_by_name (abfd
, ".got");
6524 got_addr
= sec
->vma
;
6527 if (got_addr
== (bfd_vma
) -1)
6531 /* Check for each PLT section. */
6532 names
= (char *) (s
+ count
);
6535 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
6536 if ((plt_contents
= plts
[j
].contents
) != NULL
)
6541 plt_got_offset
= plts
[j
].plt_got_offset
;
6542 plt_entry_size
= plts
[j
].plt_entry_size
;
6546 if ((plts
[j
].type
& plt_lazy
))
6548 /* Skip PLT0 in lazy PLT. */
6550 offset
= plt_entry_size
;
6558 /* Check each PLT entry against dynamic relocations. */
6559 for (; k
< plts
[j
].count
; k
++)
6565 /* Get the GOT offset, a signed 32-bit integer. */
6566 off
= H_GET_32 (abfd
, (plt_contents
+ offset
6568 got_vma
= got_addr
+ off
;
6570 /* Binary search. */
6574 while ((min
+ 1) < max
)
6578 mid
= (min
+ max
) / 2;
6580 if (got_vma
> r
->address
)
6582 else if (got_vma
< r
->address
)
6591 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6592 if (got_vma
== p
->address
6594 && (p
->howto
->type
== R_386_JUMP_SLOT
6595 || p
->howto
->type
== R_386_GLOB_DAT
6596 || p
->howto
->type
== R_386_IRELATIVE
))
6598 *s
= **p
->sym_ptr_ptr
;
6599 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
6600 set. Since we are defining a symbol, ensure one
6602 if ((s
->flags
& BSF_LOCAL
) == 0)
6603 s
->flags
|= BSF_GLOBAL
;
6604 s
->flags
|= BSF_SYNTHETIC
;
6605 /* This is no longer a section symbol. */
6606 s
->flags
&= ~BSF_SECTION_SYM
;
6608 s
->the_bfd
= plt
->owner
;
6612 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
6613 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
6619 memcpy (names
, "+0x", sizeof ("+0x") - 1);
6620 names
+= sizeof ("+0x") - 1;
6621 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
6622 for (a
= buf
; *a
== '0'; ++a
)
6625 memcpy (names
, a
, size
);
6628 memcpy (names
, "@plt", sizeof ("@plt"));
6629 names
+= sizeof ("@plt");
6633 offset
+= plt_entry_size
;
6637 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
6643 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
6644 if (plts
[j
].contents
!= NULL
)
6645 free (plts
[j
].contents
);
6652 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6655 elf_i386_hash_symbol (struct elf_link_hash_entry
*h
)
6657 if (h
->plt
.offset
!= (bfd_vma
) -1
6659 && !h
->pointer_equality_needed
)
6662 return _bfd_elf_hash_symbol (h
);
6665 /* Parse i386 GNU properties. */
6667 static enum elf_property_kind
6668 elf_i386_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
6669 bfd_byte
*ptr
, unsigned int datasz
)
6675 case GNU_PROPERTY_X86_ISA_1_USED
:
6676 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6677 case GNU_PROPERTY_X86_FEATURE_1_AND
:
6681 ((type
== GNU_PROPERTY_X86_ISA_1_USED
6682 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6683 : (type
== GNU_PROPERTY_X86_ISA_1_NEEDED
6684 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
6685 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
6687 return property_corrupt
;
6689 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
6690 /* Combine properties of the same type. */
6691 prop
->u
.number
|= bfd_h_get_32 (abfd
, ptr
);
6692 prop
->pr_kind
= property_number
;
6696 return property_ignored
;
6699 return property_number
;
6702 /* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6703 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6704 should be merged with ABFD. */
6707 elf_i386_merge_gnu_properties (struct bfd_link_info
*info
,
6708 bfd
*abfd ATTRIBUTE_UNUSED
,
6709 elf_property
*aprop
,
6710 elf_property
*bprop
)
6712 unsigned int number
, features
;
6713 bfd_boolean updated
= FALSE
;
6714 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
6718 case GNU_PROPERTY_X86_ISA_1_USED
:
6719 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6720 if (aprop
!= NULL
&& bprop
!= NULL
)
6722 number
= aprop
->u
.number
;
6723 aprop
->u
.number
= number
| bprop
->u
.number
;
6724 updated
= number
!= (unsigned int) aprop
->u
.number
;
6728 /* Return TRUE if APROP is NULL to indicate that BPROP should
6729 be added to ABFD. */
6730 updated
= aprop
== NULL
;
6734 case GNU_PROPERTY_X86_FEATURE_1_AND
:
6735 /* Only one of APROP and BPROP can be NULL:
6736 1. APROP & BPROP when both APROP and BPROP aren't NULL.
6737 2. If APROP is NULL, remove x86 feature.
6738 3. Otherwise, do nothing.
6740 if (aprop
!= NULL
&& bprop
!= NULL
)
6744 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
6746 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
6747 number
= aprop
->u
.number
;
6748 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
6749 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6750 aprop
->u
.number
= (number
& bprop
->u
.number
) | features
;
6751 updated
= number
!= (unsigned int) aprop
->u
.number
;
6752 /* Remove the property if all feature bits are cleared. */
6753 if (aprop
->u
.number
== 0)
6754 aprop
->pr_kind
= property_remove
;
6760 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
6762 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
6765 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
6766 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6769 number
= aprop
->u
.number
;
6770 aprop
->u
.number
= number
| features
;
6771 updated
= number
!= (unsigned int) aprop
->u
.number
;
6775 bprop
->u
.number
|= features
;
6779 else if (aprop
!= NULL
)
6781 aprop
->pr_kind
= property_remove
;
6788 /* Never should happen. */
6795 /* Set up i386 GNU properties. Return the first relocatable ELF input
6796 with GNU properties if found. Otherwise, return NULL. */
6799 elf_i386_link_setup_gnu_properties (struct bfd_link_info
*info
)
6801 bfd_boolean normal_target
;
6802 bfd_boolean lazy_plt
;
6803 asection
*sec
, *pltsec
;
6805 bfd_boolean use_ibt_plt
;
6806 unsigned int plt_alignment
, features
;
6807 struct elf_i386_link_hash_table
*htab
;
6814 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
6816 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
6818 /* Find a normal input file with GNU property note. */
6819 for (pbfd
= info
->input_bfds
;
6821 pbfd
= pbfd
->link
.next
)
6822 if (bfd_get_flavour (pbfd
) == bfd_target_elf_flavour
6823 && bfd_count_sections (pbfd
) != 0)
6827 if (elf_properties (pbfd
) != NULL
)
6831 if (ebfd
!= NULL
&& features
)
6833 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
6834 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6835 prop
= _bfd_elf_get_property (ebfd
,
6836 GNU_PROPERTY_X86_FEATURE_1_AND
,
6838 prop
->u
.number
|= features
;
6839 prop
->pr_kind
= property_number
;
6841 /* Create the GNU property note section if needed. */
6844 sec
= bfd_make_section_with_flags (ebfd
,
6845 NOTE_GNU_PROPERTY_SECTION_NAME
,
6853 info
->callbacks
->einfo (_("%F: failed to create GNU property section\n"));
6855 if (!bfd_set_section_alignment (ebfd
, sec
, 2))
6858 info
->callbacks
->einfo (_("%F%A: failed to align section\n"),
6862 elf_section_type (sec
) = SHT_NOTE
;
6866 pbfd
= _bfd_elf_link_setup_gnu_properties (info
);
6868 if (bfd_link_relocatable (info
))
6871 htab
= elf_i386_hash_table (info
);
6875 use_ibt_plt
= info
->ibtplt
|| info
->ibt
;
6876 if (!use_ibt_plt
&& pbfd
!= NULL
)
6878 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
6879 elf_property_list
*p
;
6881 /* The property list is sorted in order of type. */
6882 for (p
= elf_properties (pbfd
); p
; p
= p
->next
)
6884 if (GNU_PROPERTY_X86_FEATURE_1_AND
== p
->property
.pr_type
)
6886 use_ibt_plt
= !!(p
->property
.u
.number
6887 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
6890 else if (GNU_PROPERTY_X86_FEATURE_1_AND
< p
->property
.pr_type
)
6895 dynobj
= htab
->elf
.dynobj
;
6897 /* Set htab->elf.dynobj here so that there is no need to check and
6898 set it in check_relocs. */
6903 htab
->elf
.dynobj
= pbfd
;
6910 /* Find a normal input file to hold linker created
6912 for (abfd
= info
->input_bfds
;
6914 abfd
= abfd
->link
.next
)
6915 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6917 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0)
6919 htab
->elf
.dynobj
= abfd
;
6926 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
6927 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
6928 canonical function address. */
6929 htab
->plt
.has_plt0
= 1;
6930 normal_target
= FALSE
;
6932 switch (get_elf_i386_backend_data (info
->output_bfd
)->os
)
6937 htab
->lazy_plt
= &elf_i386_lazy_ibt_plt
;
6938 htab
->non_lazy_plt
= &elf_i386_non_lazy_ibt_plt
;
6942 htab
->lazy_plt
= &elf_i386_lazy_plt
;
6943 htab
->non_lazy_plt
= &elf_i386_non_lazy_plt
;
6945 normal_target
= TRUE
;
6948 htab
->lazy_plt
= &elf_i386_lazy_plt
;
6949 htab
->non_lazy_plt
= NULL
;
6950 if (!elf_vxworks_create_dynamic_sections (dynobj
, info
,
6952 info
->callbacks
->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
6955 htab
->lazy_plt
= &elf_i386_nacl_plt
;
6956 htab
->non_lazy_plt
= NULL
;
6960 pltsec
= htab
->elf
.splt
;
6962 /* If the non-lazy PLT is available, use it for all PLT entries if
6963 there are no PLT0 or no .plt section. */
6964 if (htab
->non_lazy_plt
!= NULL
6965 && (!htab
->plt
.has_plt0
|| pltsec
== NULL
))
6968 if (bfd_link_pic (info
))
6970 = htab
->non_lazy_plt
->pic_plt_entry
;
6973 = htab
->non_lazy_plt
->plt_entry
;
6974 htab
->plt
.plt_entry_size
6975 = htab
->non_lazy_plt
->plt_entry_size
;
6976 htab
->plt
.plt_got_offset
6977 = htab
->non_lazy_plt
->plt_got_offset
;
6978 htab
->plt
.eh_frame_plt_size
6979 = htab
->non_lazy_plt
->eh_frame_plt_size
;
6980 htab
->plt
.eh_frame_plt
6981 = htab
->non_lazy_plt
->eh_frame_plt
;
6986 if (bfd_link_pic (info
))
6988 htab
->plt
.plt0_entry
6989 = htab
->lazy_plt
->pic_plt0_entry
;
6991 = htab
->lazy_plt
->pic_plt_entry
;
6995 htab
->plt
.plt0_entry
6996 = htab
->lazy_plt
->plt0_entry
;
6998 = htab
->lazy_plt
->plt_entry
;
7000 htab
->plt
.plt_entry_size
7001 = htab
->lazy_plt
->plt_entry_size
;
7002 htab
->plt
.plt_got_offset
7003 = htab
->lazy_plt
->plt_got_offset
;
7004 htab
->plt
.eh_frame_plt_size
7005 = htab
->lazy_plt
->eh_frame_plt_size
;
7006 htab
->plt
.eh_frame_plt
7007 = htab
->lazy_plt
->eh_frame_plt
;
7010 /* Return if there are no normal input files. */
7014 /* Since create_dynamic_sections isn't always called, but GOT
7015 relocations need GOT sections, create them here so that we
7016 don't need to do it in check_relocs. */
7017 if (htab
->elf
.sgot
== NULL
7018 && !_bfd_elf_create_got_section (dynobj
, info
))
7019 info
->callbacks
->einfo (_("%F: failed to create GOT sections\n"));
7021 /* Create the ifunc sections here so that check_relocs can be
7023 if (!_bfd_elf_create_ifunc_sections (dynobj
, info
))
7024 info
->callbacks
->einfo (_("%F: failed to create ifunc sections\n"));
7026 plt_alignment
= bfd_log2 (htab
->plt
.plt_entry_size
);
7030 /* Whe creating executable, set the contents of the .interp
7031 section to the interpreter. */
7032 if (bfd_link_executable (info
) && !info
->nointerp
)
7034 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
7037 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
7038 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
7042 /* Don't change PLT section alignment for NaCl since it uses
7043 64-byte PLT entry and sets PLT section alignment to 32
7047 const struct elf_backend_data
*bed
7048 = get_elf_backend_data (dynobj
);
7049 flagword pltflags
= (bed
->dynamic_sec_flags
7054 unsigned int non_lazy_plt_alignment
7055 = bfd_log2 (htab
->non_lazy_plt
->plt_entry_size
);
7058 if (!bfd_set_section_alignment (sec
->owner
, sec
,
7060 goto error_alignment
;
7062 /* Create the GOT procedure linkage table. */
7063 sec
= bfd_make_section_anyway_with_flags (dynobj
,
7067 info
->callbacks
->einfo (_("%F: failed to create GOT PLT section\n"));
7069 if (!bfd_set_section_alignment (dynobj
, sec
,
7070 non_lazy_plt_alignment
))
7071 goto error_alignment
;
7073 htab
->plt_got
= sec
;
7081 /* Create the second PLT for Intel IBT support. IBT
7082 PLT is supported only for non-NaCl target and is
7083 is needed only for lazy binding. */
7084 sec
= bfd_make_section_anyway_with_flags (dynobj
,
7088 info
->callbacks
->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
7090 if (!bfd_set_section_alignment (dynobj
, sec
,
7092 goto error_alignment
;
7095 htab
->plt_second
= sec
;
7099 if (!info
->no_ld_generated_unwind_info
)
7101 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
7102 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
7103 | SEC_LINKER_CREATED
);
7105 sec
= bfd_make_section_anyway_with_flags (dynobj
,
7109 info
->callbacks
->einfo (_("%F: failed to create PLT .eh_frame section\n"));
7111 if (!bfd_set_section_alignment (dynobj
, sec
, 2))
7112 goto error_alignment
;
7114 htab
->plt_eh_frame
= sec
;
7116 if (htab
->plt_got
!= NULL
)
7118 sec
= bfd_make_section_anyway_with_flags (dynobj
,
7122 info
->callbacks
->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
7124 if (!bfd_set_section_alignment (dynobj
, sec
, 2))
7125 goto error_alignment
;
7127 htab
->plt_got_eh_frame
= sec
;
7134 /* The .iplt section is used for IFUNC symbols in static
7136 sec
= htab
->elf
.iplt
;
7138 && !bfd_set_section_alignment (sec
->owner
, sec
,
7140 goto error_alignment
;
7147 elf_i386_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
7149 if (!bfd_link_relocatable (info
))
7151 /* Check for ___tls_get_addr reference. */
7152 struct elf_link_hash_entry
*h
;
7153 h
= elf_link_hash_lookup (elf_hash_table (info
), "___tls_get_addr",
7154 FALSE
, FALSE
, FALSE
);
7156 ((struct elf_i386_link_hash_entry
*) h
)->tls_get_addr
= 1;
7159 /* Invoke the regular ELF backend linker to do all the work. */
7160 return _bfd_elf_link_check_relocs (abfd
, info
);
7164 elf_i386_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
7165 const Elf_Internal_Sym
*isym
,
7166 bfd_boolean definition
,
7167 bfd_boolean dynamic ATTRIBUTE_UNUSED
)
7171 struct elf_i386_link_hash_entry
*eh
7172 = (struct elf_i386_link_hash_entry
*) h
;
7173 eh
->def_protected
= (ELF_ST_VISIBILITY (isym
->st_other
)
7178 #define TARGET_LITTLE_SYM i386_elf32_vec
7179 #define TARGET_LITTLE_NAME "elf32-i386"
7180 #define ELF_ARCH bfd_arch_i386
7181 #define ELF_TARGET_ID I386_ELF_DATA
7182 #define ELF_MACHINE_CODE EM_386
7183 #define ELF_MAXPAGESIZE 0x1000
7185 #define elf_backend_can_gc_sections 1
7186 #define elf_backend_can_refcount 1
7187 #define elf_backend_want_got_plt 1
7188 #define elf_backend_plt_readonly 1
7189 #define elf_backend_want_plt_sym 0
7190 #define elf_backend_got_header_size 12
7191 #define elf_backend_plt_alignment 4
7192 #define elf_backend_dtrel_excludes_plt 1
7193 #define elf_backend_extern_protected_data 1
7194 #define elf_backend_caches_rawsize 1
7195 #define elf_backend_want_dynrelro 1
7197 /* Support RELA for objdump of prelink objects. */
7198 #define elf_info_to_howto elf_i386_info_to_howto_rel
7199 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
7201 #define bfd_elf32_mkobject elf_i386_mkobject
7203 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
7204 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
7205 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
7206 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
7207 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
7208 #define bfd_elf32_bfd_link_check_relocs elf_i386_link_check_relocs
7210 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
7211 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
7212 #define elf_backend_check_relocs elf_i386_check_relocs
7213 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
7214 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
7215 #define elf_backend_fake_sections elf_i386_fake_sections
7216 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
7217 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
7218 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
7219 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
7220 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
7221 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
7222 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
7223 #define elf_backend_relocate_section elf_i386_relocate_section
7224 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
7225 #define elf_backend_always_size_sections elf_i386_always_size_sections
7226 #define elf_backend_omit_section_dynsym \
7227 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7228 #define elf_backend_hash_symbol elf_i386_hash_symbol
7229 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
7230 #define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
7231 #define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
7232 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
7233 #define elf_backend_merge_symbol_attribute elf_i386_merge_symbol_attribute
7235 #include "elf32-target.h"
7237 /* FreeBSD support. */
7239 #undef TARGET_LITTLE_SYM
7240 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
7241 #undef TARGET_LITTLE_NAME
7242 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
7244 #define ELF_OSABI ELFOSABI_FREEBSD
7246 /* The kernel recognizes executables as valid only if they carry a
7247 "FreeBSD" label in the ELF header. So we put this label on all
7248 executables and (for simplicity) also all other object files. */
7251 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
7253 _bfd_elf_post_process_headers (abfd
, info
);
7255 #ifdef OLD_FREEBSD_ABI_LABEL
7257 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
7258 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
7259 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
7264 #undef elf_backend_post_process_headers
7265 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
7267 #define elf32_bed elf32_i386_fbsd_bed
7269 #undef elf_backend_add_symbol_hook
7271 #include "elf32-target.h"
7275 #undef TARGET_LITTLE_SYM
7276 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
7277 #undef TARGET_LITTLE_NAME
7278 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
7280 #undef elf_backend_post_process_headers
7282 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7283 objects won't be recognized. */
7287 #define elf32_bed elf32_i386_sol2_bed
7289 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
7291 #undef elf_backend_static_tls_alignment
7292 #define elf_backend_static_tls_alignment 8
7294 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7296 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7298 #undef elf_backend_want_plt_sym
7299 #define elf_backend_want_plt_sym 1
7301 #undef elf_backend_strtab_flags
7302 #define elf_backend_strtab_flags SHF_STRINGS
7304 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
7305 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
7306 FALSE otherwise. ISECTION is the best guess matching section from the
7307 input bfd IBFD, but it might be NULL. */
7310 elf32_i386_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
7311 bfd
*obfd ATTRIBUTE_UNUSED
,
7312 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
7313 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
7315 /* PR 19938: FIXME: Need to add code for setting the sh_info
7316 and sh_link fields of Solaris specific section types. */
7319 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
7320 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
7322 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
7324 The following values should be set:
7327 -----------------------------------------------------------------------------
7328 SHT_SUNW_ancillary The section header index of 0
7329 [0x6fffffee] the associated string table.
7331 SHT_SUNW_capinfo The section header index of For a dynamic object, the
7332 [0x6ffffff0] the associated symbol table. section header index of
7334 SHT_SUNW_capchain table,
7337 SHT_SUNW_symsort The section header index of 0
7338 [0x6ffffff1] the associated symbol table.
7340 SHT_SUNW_tlssort The section header index of 0
7341 [0x6ffffff2] the associated symbol table.
7343 SHT_SUNW_LDYNSYM The section header index of One greater than the
7344 [0x6ffffff3] the associated string table. symbol table index of the
7345 This index is the same string last local symbol,
7346 table used by the SHT_DYNSYM STB_LOCAL. Since
7347 section. SHT_SUNW_LDYNSYM only
7348 contains local symbols,
7349 sh_info is equivalent to
7350 the number of symbols in
7353 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
7354 [0x6ffffff5] the section header index of to named strings, the
7355 the associated section header index of
7356 SHT_SUNW_capinfo table, the associated string
7357 otherwise 0. table, otherwise 0.
7359 SHT_SUNW_move The section header index of 0
7360 [0x6ffffffa] the associated symbol table.
7365 SHT_SUNW_syminfo The section header index of The section header index
7366 [0x6ffffffc] the associated symbol table. of the associated
7369 SHT_SUNW_verdef The section header index of The number of version
7370 [0x6ffffffd] the associated string table. definitions within the
7373 SHT_SUNW_verneed The section header index of The number of version
7374 [0x6ffffffe] the associated string table. dependencies within the
7377 SHT_SUNW_versym The section header index of 0
7378 [0x6fffffff] the associated symbol table. */
7381 #undef elf_backend_copy_special_section_fields
7382 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
7384 #include "elf32-target.h"
7386 /* Intel MCU support. */
7389 elf32_iamcu_elf_object_p (bfd
*abfd
)
7391 /* Set the right machine number for an IAMCU elf32 file. */
7392 bfd_default_set_arch_mach (abfd
, bfd_arch_iamcu
, bfd_mach_i386_iamcu
);
7396 #undef TARGET_LITTLE_SYM
7397 #define TARGET_LITTLE_SYM iamcu_elf32_vec
7398 #undef TARGET_LITTLE_NAME
7399 #define TARGET_LITTLE_NAME "elf32-iamcu"
7401 #define ELF_ARCH bfd_arch_iamcu
7403 #undef ELF_MACHINE_CODE
7404 #define ELF_MACHINE_CODE EM_IAMCU
7409 #define elf32_bed elf32_iamcu_bed
7411 #undef elf_backend_object_p
7412 #define elf_backend_object_p elf32_iamcu_elf_object_p
7414 #undef elf_backend_static_tls_alignment
7416 #undef elf_backend_want_plt_sym
7417 #define elf_backend_want_plt_sym 0
7419 #undef elf_backend_strtab_flags
7420 #undef elf_backend_copy_special_section_fields
7422 #include "elf32-target.h"
7424 /* Restore defaults. */
7426 #define ELF_ARCH bfd_arch_i386
7427 #undef ELF_MACHINE_CODE
7428 #define ELF_MACHINE_CODE EM_386
7430 /* Native Client support. */
7432 #undef TARGET_LITTLE_SYM
7433 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
7434 #undef TARGET_LITTLE_NAME
7435 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
7437 #define elf32_bed elf32_i386_nacl_bed
7439 #undef ELF_MAXPAGESIZE
7440 #define ELF_MAXPAGESIZE 0x10000
7442 /* Restore defaults. */
7444 #undef elf_backend_want_plt_sym
7445 #define elf_backend_want_plt_sym 0
7446 #undef elf_backend_post_process_headers
7447 #undef elf_backend_static_tls_alignment
7449 /* NaCl uses substantially different PLT entries for the same effects. */
7451 #undef elf_backend_plt_alignment
7452 #define elf_backend_plt_alignment 5
7453 #define NACL_PLT_ENTRY_SIZE 64
7454 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7456 static const bfd_byte elf_i386_nacl_plt0_entry
[] =
7458 0xff, 0x35, /* pushl contents of address */
7459 0, 0, 0, 0, /* replaced with address of .got + 4. */
7460 0x8b, 0x0d, /* movl contents of address, %ecx */
7461 0, 0, 0, 0, /* replaced with address of .got + 8. */
7462 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
7463 0xff, 0xe1 /* jmp *%ecx */
7466 static const bfd_byte elf_i386_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
7468 0x8b, 0x0d, /* movl contents of address, %ecx */
7469 0, 0, 0, 0, /* replaced with GOT slot address. */
7470 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
7471 0xff, 0xe1, /* jmp *%ecx */
7473 /* Pad to the next 32-byte boundary with nop instructions. */
7475 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7476 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7478 /* Lazy GOT entries point here (32-byte aligned). */
7479 0x68, /* pushl immediate */
7480 0, 0, 0, 0, /* replaced with reloc offset. */
7481 0xe9, /* jmp relative */
7482 0, 0, 0, 0, /* replaced with offset to .plt. */
7484 /* Pad to the next 32-byte boundary with nop instructions. */
7485 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7486 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7490 static const bfd_byte
7491 elf_i386_nacl_pic_plt0_entry
[sizeof (elf_i386_nacl_plt0_entry
)] =
7493 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
7494 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
7495 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
7496 0xff, 0xe1, /* jmp *%ecx */
7498 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
7499 so pad to that size with nop instructions. */
7500 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
7503 static const bfd_byte elf_i386_nacl_pic_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
7505 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
7506 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
7507 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
7508 0xff, 0xe1, /* jmp *%ecx */
7510 /* Pad to the next 32-byte boundary with nop instructions. */
7512 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7513 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7515 /* Lazy GOT entries point here (32-byte aligned). */
7516 0x68, /* pushl immediate */
7517 0, 0, 0, 0, /* replaced with offset into relocation table. */
7518 0xe9, /* jmp relative */
7519 0, 0, 0, 0, /* replaced with offset to start of .plt. */
7521 /* Pad to the next 32-byte boundary with nop instructions. */
7522 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7523 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7527 static const bfd_byte elf_i386_nacl_eh_frame_plt
[] =
7529 #if (PLT_CIE_LENGTH != 20 \
7530 || PLT_FDE_LENGTH != 36 \
7531 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7532 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7533 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
7535 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
7536 0, 0, 0, 0, /* CIE ID */
7537 1, /* CIE version */
7538 'z', 'R', 0, /* Augmentation string */
7539 1, /* Code alignment factor */
7540 0x7c, /* Data alignment factor: -4 */
7541 8, /* Return address column */
7542 1, /* Augmentation size */
7543 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
7544 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
7545 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
7546 DW_CFA_nop
, DW_CFA_nop
,
7548 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
7549 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
7550 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
7551 0, 0, 0, 0, /* .plt size goes here */
7552 0, /* Augmentation size */
7553 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
7554 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7555 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
7556 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7557 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
7558 13, /* Block length */
7559 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
7560 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
7561 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
7562 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
7563 DW_CFA_nop
, DW_CFA_nop
7566 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt
=
7568 elf_i386_nacl_plt0_entry
, /* plt0_entry */
7569 sizeof (elf_i386_nacl_plt0_entry
), /* plt0_entry_size */
7570 2, /* plt0_got1_offset */
7571 8, /* plt0_got2_offset */
7572 elf_i386_nacl_plt_entry
, /* plt_entry */
7573 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
7574 2, /* plt_got_offset */
7575 33, /* plt_reloc_offset */
7576 38, /* plt_plt_offset */
7577 32, /* plt_lazy_offset */
7578 elf_i386_nacl_pic_plt0_entry
, /* pic_plt0_entry */
7579 elf_i386_nacl_pic_plt_entry
, /* pic_plt_entry */
7580 elf_i386_nacl_eh_frame_plt
, /* eh_frame_plt */
7581 sizeof (elf_i386_nacl_eh_frame_plt
) /* eh_frame_plt_size */
7584 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed
=
7586 0x90, /* plt0_pad_byte: nop insn */
7591 elf32_i386_nacl_elf_object_p (bfd
*abfd
)
7593 /* Set the right machine number for a NaCl i386 ELF32 file. */
7594 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_i386_i386_nacl
);
7598 #undef elf_backend_arch_data
7599 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
7601 #undef elf_backend_object_p
7602 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
7603 #undef elf_backend_modify_segment_map
7604 #define elf_backend_modify_segment_map nacl_modify_segment_map
7605 #undef elf_backend_modify_program_headers
7606 #define elf_backend_modify_program_headers nacl_modify_program_headers
7607 #undef elf_backend_final_write_processing
7608 #define elf_backend_final_write_processing nacl_final_write_processing
7610 #include "elf32-target.h"
7612 /* Restore defaults. */
7613 #undef elf_backend_object_p
7614 #undef elf_backend_modify_segment_map
7615 #undef elf_backend_modify_program_headers
7616 #undef elf_backend_final_write_processing
7618 /* VxWorks support. */
7620 #undef TARGET_LITTLE_SYM
7621 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
7622 #undef TARGET_LITTLE_NAME
7623 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
7625 #undef ELF_MAXPAGESIZE
7626 #define ELF_MAXPAGESIZE 0x1000
7627 #undef elf_backend_plt_alignment
7628 #define elf_backend_plt_alignment 4
7630 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed
=
7632 0x90, /* plt0_pad_byte */
7636 #undef elf_backend_arch_data
7637 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
7639 #undef elf_backend_relocs_compatible
7640 #undef elf_backend_add_symbol_hook
7641 #define elf_backend_add_symbol_hook \
7642 elf_vxworks_add_symbol_hook
7643 #undef elf_backend_link_output_symbol_hook
7644 #define elf_backend_link_output_symbol_hook \
7645 elf_vxworks_link_output_symbol_hook
7646 #undef elf_backend_emit_relocs
7647 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
7648 #undef elf_backend_final_write_processing
7649 #define elf_backend_final_write_processing \
7650 elf_vxworks_final_write_processing
7651 #undef elf_backend_static_tls_alignment
7653 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7655 #undef elf_backend_want_plt_sym
7656 #define elf_backend_want_plt_sym 1
7659 #define elf32_bed elf32_i386_vxworks_bed
7661 #include "elf32-target.h"