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. */
21 #include "elfxx-x86.h"
23 #include "elf-vxworks.h"
25 #include "opcode/i386.h"
27 /* 386 uses REL relocations instead of RELA. */
32 static reloc_howto_type elf_howto_table
[]=
34 HOWTO(R_386_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
35 bfd_elf_generic_reloc
, "R_386_NONE",
36 TRUE
, 0x00000000, 0x00000000, FALSE
),
37 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
38 bfd_elf_generic_reloc
, "R_386_32",
39 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
40 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
41 bfd_elf_generic_reloc
, "R_386_PC32",
42 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
43 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
44 bfd_elf_generic_reloc
, "R_386_GOT32",
45 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
46 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
47 bfd_elf_generic_reloc
, "R_386_PLT32",
48 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
49 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
50 bfd_elf_generic_reloc
, "R_386_COPY",
51 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
52 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
53 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
54 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
55 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
56 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
57 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
58 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
59 bfd_elf_generic_reloc
, "R_386_RELATIVE",
60 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
61 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_386_GOTOFF",
63 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
64 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
65 bfd_elf_generic_reloc
, "R_386_GOTPC",
66 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
78 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
79 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_386_TLS_IE",
81 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
82 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
84 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
85 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
86 bfd_elf_generic_reloc
, "R_386_TLS_LE",
87 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
88 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_386_TLS_GD",
90 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
91 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
92 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
93 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
94 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_386_16",
96 TRUE
, 0xffff, 0xffff, FALSE
),
97 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_386_PC16",
99 TRUE
, 0xffff, 0xffff, TRUE
),
100 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_386_8",
102 TRUE
, 0xff, 0xff, FALSE
),
103 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
104 bfd_elf_generic_reloc
, "R_386_PC8",
105 TRUE
, 0xff, 0xff, TRUE
),
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
111 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
112 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
113 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
115 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
116 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
117 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
118 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
119 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
120 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
121 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
122 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
123 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
124 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
125 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
127 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
128 HOWTO(R_386_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
129 bfd_elf_generic_reloc
, "R_386_SIZE32",
130 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
131 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
132 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
133 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
134 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
135 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
137 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
138 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
139 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
140 HOWTO(R_386_IRELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
141 bfd_elf_generic_reloc
, "R_386_IRELATIVE",
142 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
143 HOWTO(R_386_GOT32X
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
144 bfd_elf_generic_reloc
, "R_386_GOT32X",
145 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT
, /* type */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
156 FALSE
, /* pc_relative */
158 complain_overflow_dont
, /* complain_on_overflow */
159 NULL
, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE
, /* partial_inplace */
164 FALSE
), /* pcrel_offset */
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY
, /* type */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
171 FALSE
, /* pc_relative */
173 complain_overflow_dont
, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE
, /* partial_inplace */
179 FALSE
) /* pcrel_offset */
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185 #ifdef DEBUG_GEN_RELOC
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 static reloc_howto_type
*
193 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
194 bfd_reloc_code_real_type code
)
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table
[R_386_NONE
];
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table
[R_386_32
];
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table
[R_386_32
];
210 case BFD_RELOC_32_PCREL
:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table
[R_386_PC32
];
214 case BFD_RELOC_386_GOT32
:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table
[R_386_GOT32
];
218 case BFD_RELOC_386_PLT32
:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table
[R_386_PLT32
];
222 case BFD_RELOC_386_COPY
:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table
[R_386_COPY
];
226 case BFD_RELOC_386_GLOB_DAT
:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table
[R_386_GLOB_DAT
];
230 case BFD_RELOC_386_JUMP_SLOT
:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table
[R_386_JUMP_SLOT
];
234 case BFD_RELOC_386_RELATIVE
:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table
[R_386_RELATIVE
];
238 case BFD_RELOC_386_GOTOFF
:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table
[R_386_GOTOFF
];
242 case BFD_RELOC_386_GOTPC
:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table
[R_386_GOTPC
];
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF
:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
251 case BFD_RELOC_386_TLS_IE
:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
255 case BFD_RELOC_386_TLS_GOTIE
:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
259 case BFD_RELOC_386_TLS_LE
:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
263 case BFD_RELOC_386_TLS_GD
:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
267 case BFD_RELOC_386_TLS_LDM
:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
275 case BFD_RELOC_16_PCREL
:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
283 case BFD_RELOC_8_PCREL
:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32
:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
292 case BFD_RELOC_386_TLS_IE_32
:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
296 case BFD_RELOC_386_TLS_LE_32
:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
300 case BFD_RELOC_386_TLS_DTPMOD32
:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
304 case BFD_RELOC_386_TLS_DTPOFF32
:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
308 case BFD_RELOC_386_TLS_TPOFF32
:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
312 case BFD_RELOC_SIZE32
:
313 TRACE ("BFD_RELOC_SIZE32");
314 return &elf_howto_table
[R_386_SIZE32
- R_386_tls_offset
];
316 case BFD_RELOC_386_TLS_GOTDESC
:
317 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
318 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
320 case BFD_RELOC_386_TLS_DESC_CALL
:
321 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
322 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
324 case BFD_RELOC_386_TLS_DESC
:
325 TRACE ("BFD_RELOC_386_TLS_DESC");
326 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
328 case BFD_RELOC_386_IRELATIVE
:
329 TRACE ("BFD_RELOC_386_IRELATIVE");
330 return &elf_howto_table
[R_386_IRELATIVE
- R_386_tls_offset
];
332 case BFD_RELOC_386_GOT32X
:
333 TRACE ("BFD_RELOC_386_GOT32X");
334 return &elf_howto_table
[R_386_GOT32X
- R_386_tls_offset
];
336 case BFD_RELOC_VTABLE_INHERIT
:
337 TRACE ("BFD_RELOC_VTABLE_INHERIT");
338 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
340 case BFD_RELOC_VTABLE_ENTRY
:
341 TRACE ("BFD_RELOC_VTABLE_ENTRY");
342 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
352 static reloc_howto_type
*
353 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
358 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
359 if (elf_howto_table
[i
].name
!= NULL
360 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
361 return &elf_howto_table
[i
];
366 static reloc_howto_type
*
367 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
371 if ((indx
= r_type
) >= R_386_standard
372 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
373 >= R_386_ext
- R_386_standard
)
374 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
375 >= R_386_ext2
- R_386_ext
)
376 && ((indx
= r_type
- R_386_vt_offset
) - R_386_ext2
377 >= R_386_vt
- R_386_ext2
))
379 /* xgettext:c-format */
380 _bfd_error_handler (_("%B: invalid relocation type %d"),
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table
[indx
].type
!= r_type
)
387 return &elf_howto_table
[indx
];
391 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
393 Elf_Internal_Rela
*dst
)
395 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
396 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
399 /* Return whether a symbol name implies a local label. The UnixWare
400 2.1 cc generates temporary symbols that start with .X, so we
401 recognize them here. FIXME: do other SVR4 compilers also use .X?.
402 If so, we should move the .X recognition into
403 _bfd_elf_is_local_label_name. */
406 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
408 if (name
[0] == '.' && name
[1] == 'X')
411 return _bfd_elf_is_local_label_name (abfd
, name
);
414 /* Support for core dump NOTE sections. */
417 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
422 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
424 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
430 elf_tdata (abfd
)->core
->signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
433 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
437 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
441 switch (note
->descsz
)
446 case 144: /* Linux/i386 */
448 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
451 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
461 /* Make a ".reg/999" section. */
462 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
463 size
, note
->descpos
+ offset
);
467 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
469 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
471 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
476 elf_tdata (abfd
)->core
->program
477 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
478 elf_tdata (abfd
)->core
->command
479 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
483 switch (note
->descsz
)
488 case 124: /* Linux/i386 elf_prpsinfo. */
489 elf_tdata (abfd
)->core
->pid
490 = bfd_get_32 (abfd
, note
->descdata
+ 12);
491 elf_tdata (abfd
)->core
->program
492 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
493 elf_tdata (abfd
)->core
->command
494 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
498 /* Note that for some reason, a spurious space is tacked
499 onto the end of the args in some (at least one anyway)
500 implementations, so strip it off if it exists. */
502 char *command
= elf_tdata (abfd
)->core
->command
;
503 int n
= strlen (command
);
505 if (0 < n
&& command
[n
- 1] == ' ')
506 command
[n
- 1] = '\0';
512 /* Functions for the i386 ELF linker.
514 In order to gain some understanding of code in this file without
515 knowing all the intricate details of the linker, note the
518 Functions named elf_i386_* are called by external routines, other
519 functions are only called locally. elf_i386_* functions appear
520 in this file more or less in the order in which they are called
521 from external routines. eg. elf_i386_check_relocs is called
522 early in the link process, elf_i386_finish_dynamic_sections is
523 one of the last functions. */
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
527 #define LAZY_PLT_ENTRY_SIZE 16
529 /* The size in bytes of an entry in the non-lazy procedure linkage
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
534 /* The first entry in an absolute lazy procedure linkage table looks
535 like this. See the SVR4 ABI i386 supplement to see how this works.
536 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
538 static const bfd_byte elf_i386_lazy_plt0_entry
[12] =
540 0xff, 0x35, /* pushl contents of address */
541 0, 0, 0, 0, /* replaced with address of .got + 4. */
542 0xff, 0x25, /* jmp indirect */
543 0, 0, 0, 0 /* replaced with address of .got + 8. */
546 /* Subsequent entries in an absolute lazy procedure linkage table look
549 static const bfd_byte elf_i386_lazy_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
551 0xff, 0x25, /* jmp indirect */
552 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
553 0x68, /* pushl immediate */
554 0, 0, 0, 0, /* replaced with offset into relocation table. */
555 0xe9, /* jmp relative */
556 0, 0, 0, 0 /* replaced with offset to start of .plt. */
559 /* The first entry in a PIC lazy procedure linkage table look like
560 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
561 lazy_plt->plt0_pad_byte. */
563 static const bfd_byte elf_i386_pic_lazy_plt0_entry
[12] =
565 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
566 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
569 /* Subsequent entries in a PIC lazy procedure linkage table look like
572 static const bfd_byte elf_i386_pic_lazy_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
574 0xff, 0xa3, /* jmp *offset(%ebx) */
575 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
576 0x68, /* pushl immediate */
577 0, 0, 0, 0, /* replaced with offset into relocation table. */
578 0xe9, /* jmp relative */
579 0, 0, 0, 0 /* replaced with offset to start of .plt. */
582 /* Entries in the non-lazy procedure linkage table look like this. */
584 static const bfd_byte elf_i386_non_lazy_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
586 0xff, 0x25, /* jmp indirect */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x66, 0x90 /* xchg %ax,%ax */
591 /* Entries in the PIC non-lazy procedure linkage table look like
594 static const bfd_byte elf_i386_pic_non_lazy_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
596 0xff, 0xa3, /* jmp *offset(%ebx) */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
601 /* The first entry in an absolute IBT-enabled lazy procedure linkage
602 table looks like this. */
604 static const bfd_byte elf_i386_lazy_ibt_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
606 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
607 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
608 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
611 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
612 table look like this. Subsequent entries for a PIC IBT-enabled lazy
613 procedure linkage table are the same. */
615 static const bfd_byte elf_i386_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
617 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
618 0x68, 0, 0, 0, 0, /* pushl immediate */
619 0xe9, 0, 0, 0, 0, /* jmp relative */
620 0x66, 0x90 /* xchg %ax,%ax */
623 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
626 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
628 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
629 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
630 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
633 /* Entries for branches with IBT-enabled in the absolute non-lazey
634 procedure linkage table look like this. They have the same size
635 as the lazy PLT entry. */
637 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
639 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
640 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
641 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
644 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
648 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
655 /* .eh_frame covering the lazy .plt section. */
657 static const bfd_byte elf_i386_eh_frame_lazy_plt
[] =
659 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
660 0, 0, 0, 0, /* CIE ID */
662 'z', 'R', 0, /* Augmentation string */
663 1, /* Code alignment factor */
664 0x7c, /* Data alignment factor */
665 8, /* Return address column */
666 1, /* Augmentation size */
667 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
668 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
669 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
670 DW_CFA_nop
, DW_CFA_nop
,
672 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
673 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
674 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
675 0, 0, 0, 0, /* .plt size goes here */
676 0, /* Augmentation size */
677 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
678 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
679 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
680 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
681 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
682 11, /* Block length */
683 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
684 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
685 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
686 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
687 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
690 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
692 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt
[] =
694 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
695 0, 0, 0, 0, /* CIE ID */
697 'z', 'R', 0, /* Augmentation string */
698 1, /* Code alignment factor */
699 0x7c, /* Data alignment factor */
700 8, /* Return address column */
701 1, /* Augmentation size */
702 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
703 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
704 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
705 DW_CFA_nop
, DW_CFA_nop
,
707 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
708 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
709 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
710 0, 0, 0, 0, /* .plt size goes here */
711 0, /* Augmentation size */
712 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
713 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
714 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
715 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
716 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
717 11, /* Block length */
718 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
719 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
720 DW_OP_lit15
, DW_OP_and
, DW_OP_lit9
, DW_OP_ge
,
721 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
722 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
725 /* .eh_frame covering the non-lazy .plt section. */
727 static const bfd_byte elf_i386_eh_frame_non_lazy_plt
[] =
729 #define PLT_GOT_FDE_LENGTH 16
730 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
731 0, 0, 0, 0, /* CIE ID */
733 'z', 'R', 0, /* Augmentation string */
734 1, /* Code alignment factor */
735 0x7c, /* Data alignment factor */
736 8, /* Return address column */
737 1, /* Augmentation size */
738 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
739 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
740 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
741 DW_CFA_nop
, DW_CFA_nop
,
743 PLT_GOT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
744 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
745 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
746 0, 0, 0, 0, /* non-lazy .plt size goes here */
747 0, /* Augmentation size */
748 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
751 /* These are the standard parameters. */
752 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt
=
754 elf_i386_lazy_plt0_entry
, /* plt0_entry */
755 sizeof (elf_i386_lazy_plt0_entry
), /* plt0_entry_size */
756 elf_i386_lazy_plt_entry
, /* plt_entry */
757 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
758 2, /* plt0_got1_offset */
759 8, /* plt0_got2_offset */
760 0, /* plt0_got2_insn_end */
761 2, /* plt_got_offset */
762 7, /* plt_reloc_offset */
763 12, /* plt_plt_offset */
764 0, /* plt_got_insn_size */
765 0, /* plt_plt_insn_end */
766 6, /* plt_lazy_offset */
767 elf_i386_pic_lazy_plt0_entry
, /* pic_plt0_entry */
768 elf_i386_pic_lazy_plt_entry
, /* pic_plt_entry */
769 elf_i386_eh_frame_lazy_plt
, /* eh_frame_plt */
770 sizeof (elf_i386_eh_frame_lazy_plt
) /* eh_frame_plt_size */
773 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt
=
775 elf_i386_non_lazy_plt_entry
, /* plt_entry */
776 elf_i386_pic_non_lazy_plt_entry
, /* pic_plt_entry */
777 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
778 2, /* plt_got_offset */
779 0, /* plt_got_insn_size */
780 elf_i386_eh_frame_non_lazy_plt
, /* eh_frame_plt */
781 sizeof (elf_i386_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
784 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt
=
786 elf_i386_lazy_ibt_plt0_entry
, /* plt0_entry */
787 sizeof (elf_i386_lazy_ibt_plt0_entry
), /* plt0_entry_size */
788 elf_i386_lazy_ibt_plt_entry
, /* plt_entry */
789 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
790 2, /* plt0_got1_offset */
791 8, /* plt0_got2_offset */
792 0, /* plt0_got2_insn_end */
793 4+2, /* plt_got_offset */
794 4+1, /* plt_reloc_offset */
795 4+6, /* plt_plt_offset */
796 0, /* plt_got_insn_size */
797 0, /* plt_plt_insn_end */
798 0, /* plt_lazy_offset */
799 elf_i386_pic_lazy_ibt_plt0_entry
, /* pic_plt0_entry */
800 elf_i386_lazy_ibt_plt_entry
, /* pic_plt_entry */
801 elf_i386_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
802 sizeof (elf_i386_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
805 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt
=
807 elf_i386_non_lazy_ibt_plt_entry
, /* plt_entry */
808 elf_i386_pic_non_lazy_ibt_plt_entry
,/* pic_plt_entry */
809 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
810 4+2, /* plt_got_offset */
811 0, /* plt_got_insn_size */
812 elf_i386_eh_frame_non_lazy_plt
, /* eh_frame_plt */
813 sizeof (elf_i386_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
817 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
818 for the PLTResolve stub and then for each PLT entry. */
819 #define PLTRESOLVE_RELOCS_SHLIB 0
820 #define PLTRESOLVE_RELOCS 2
821 #define PLT_NON_JUMP_SLOT_RELOCS 2
823 /* Architecture-specific backend data for i386. */
825 struct elf_i386_backend_data
827 /* Value used to fill the unused bytes of the first PLT entry. */
828 bfd_byte plt0_pad_byte
;
839 #define get_elf_i386_backend_data(abfd) \
840 ((const struct elf_i386_backend_data *) \
841 get_elf_backend_data (abfd)->arch_data)
843 /* These are the standard parameters. */
844 static const struct elf_i386_backend_data elf_i386_arch_bed
=
846 0, /* plt0_pad_byte */
850 #define elf_backend_arch_data &elf_i386_arch_bed
852 /* Return TRUE if the TLS access code sequence support transition
856 elf_i386_check_tls_transition (asection
*sec
,
858 Elf_Internal_Shdr
*symtab_hdr
,
859 struct elf_link_hash_entry
**sym_hashes
,
861 const Elf_Internal_Rela
*rel
,
862 const Elf_Internal_Rela
*relend
)
864 unsigned int val
, type
, reg
;
865 unsigned long r_symndx
;
866 struct elf_link_hash_entry
*h
;
869 bfd_boolean indirect_call
;
871 offset
= rel
->r_offset
;
876 if (offset
< 2 || (rel
+ 1) >= relend
)
879 indirect_call
= FALSE
;
880 call
= contents
+ offset
+ 4;
883 if (r_type
== R_386_TLS_GD
)
885 /* Check transition from GD access model. Only
886 leal foo@tlsgd(,%ebx,1), %eax
887 call ___tls_get_addr@PLT
889 leal foo@tlsgd(%ebx) %eax
890 call ___tls_get_addr@PLT
893 leal foo@tlsgd(%reg), %eax
894 call *___tls_get_addr@GOT(%reg)
895 which may be converted to
896 addr32 call ___tls_get_addr
897 can transit to different access model. */
898 if ((offset
+ 10) > sec
->size
899 || (type
!= 0x8d && type
!= 0x04))
904 /* leal foo@tlsgd(,%ebx,1), %eax
905 call ___tls_get_addr@PLT */
909 if (*(call
- 7) != 0x8d
917 leal foo@tlsgd(%ebx), %eax
918 call ___tls_get_addr@PLT
921 leal foo@tlsgd(%reg), %eax
922 call *___tls_get_addr@GOT(%reg)
923 which may be converted to
924 addr32 call ___tls_get_addr
926 %eax can't be used as the GOT base register since it
927 is used to pass parameter to ___tls_get_addr. */
929 if ((val
& 0xf8) != 0x80 || reg
== 4 || reg
== 0)
932 indirect_call
= call
[0] == 0xff;
933 if (!(reg
== 3 && call
[0] == 0xe8 && call
[5] == 0x90)
934 && !(call
[0] == 0x67 && call
[1] == 0xe8)
936 && (call
[1] & 0xf8) == 0x90
937 && (call
[1] & 0x7) == reg
))
943 /* Check transition from LD access model. Only
944 leal foo@tlsldm(%ebx), %eax
945 call ___tls_get_addr@PLT
947 leal foo@tlsldm(%reg), %eax
948 call *___tls_get_addr@GOT(%reg)
949 which may be converted to
950 addr32 call ___tls_get_addr
951 can transit to different access model. */
952 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
955 /* %eax can't be used as the GOT base register since it is
956 used to pass parameter to ___tls_get_addr. */
958 if ((val
& 0xf8) != 0x80 || reg
== 4 || reg
== 0)
961 indirect_call
= call
[0] == 0xff;
962 if (!(reg
== 3 && call
[0] == 0xe8)
963 && !(call
[0] == 0x67 && call
[1] == 0xe8)
965 && (call
[1] & 0xf8) == 0x90
966 && (call
[1] & 0x7) == reg
))
970 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
971 if (r_symndx
< symtab_hdr
->sh_info
)
974 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
976 || !((struct elf_x86_link_hash_entry
*) h
)->tls_get_addr
)
978 else if (indirect_call
)
979 return (ELF32_R_TYPE (rel
[1].r_info
) == R_386_GOT32X
);
981 return (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
982 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
985 /* Check transition from IE access model:
986 movl foo@indntpoff(%rip), %eax
987 movl foo@indntpoff(%rip), %reg
988 addl foo@indntpoff(%rip), %reg
991 if (offset
< 1 || (offset
+ 4) > sec
->size
)
994 /* Check "movl foo@tpoff(%rip), %eax" first. */
995 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1002 /* Check movl|addl foo@tpoff(%rip), %reg. */
1003 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1004 return ((type
== 0x8b || type
== 0x03)
1005 && (val
& 0xc7) == 0x05);
1007 case R_386_TLS_GOTIE
:
1008 case R_386_TLS_IE_32
:
1009 /* Check transition from {IE_32,GOTIE} access model:
1010 subl foo@{tpoff,gontoff}(%reg1), %reg2
1011 movl foo@{tpoff,gontoff}(%reg1), %reg2
1012 addl foo@{tpoff,gontoff}(%reg1), %reg2
1015 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1018 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1019 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1022 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1023 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1025 case R_386_TLS_GOTDESC
:
1026 /* Check transition from GDesc access model:
1027 leal x@tlsdesc(%ebx), %eax
1029 Make sure it's a leal adding ebx to a 32-bit offset
1030 into any register, although it's probably almost always
1033 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1036 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1039 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1040 return (val
& 0xc7) == 0x83;
1042 case R_386_TLS_DESC_CALL
:
1043 /* Check transition from GDesc access model:
1044 call *x@tlsdesc(%eax)
1046 if (offset
+ 2 <= sec
->size
)
1048 /* Make sure that it's a call *x@tlsdesc(%eax). */
1049 call
= contents
+ offset
;
1050 return call
[0] == 0xff && call
[1] == 0x10;
1060 /* Return TRUE if the TLS access transition is OK or no transition
1061 will be performed. Update R_TYPE if there is a transition. */
1064 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1065 asection
*sec
, bfd_byte
*contents
,
1066 Elf_Internal_Shdr
*symtab_hdr
,
1067 struct elf_link_hash_entry
**sym_hashes
,
1068 unsigned int *r_type
, int tls_type
,
1069 const Elf_Internal_Rela
*rel
,
1070 const Elf_Internal_Rela
*relend
,
1071 struct elf_link_hash_entry
*h
,
1072 unsigned long r_symndx
,
1073 bfd_boolean from_relocate_section
)
1075 unsigned int from_type
= *r_type
;
1076 unsigned int to_type
= from_type
;
1077 bfd_boolean check
= TRUE
;
1079 /* Skip TLS transition for functions. */
1081 && (h
->type
== STT_FUNC
1082 || h
->type
== STT_GNU_IFUNC
))
1088 case R_386_TLS_GOTDESC
:
1089 case R_386_TLS_DESC_CALL
:
1090 case R_386_TLS_IE_32
:
1092 case R_386_TLS_GOTIE
:
1093 if (bfd_link_executable (info
))
1096 to_type
= R_386_TLS_LE_32
;
1097 else if (from_type
!= R_386_TLS_IE
1098 && from_type
!= R_386_TLS_GOTIE
)
1099 to_type
= R_386_TLS_IE_32
;
1102 /* When we are called from elf_i386_relocate_section, there may
1103 be additional transitions based on TLS_TYPE. */
1104 if (from_relocate_section
)
1106 unsigned int new_to_type
= to_type
;
1108 if (bfd_link_executable (info
)
1111 && (tls_type
& GOT_TLS_IE
))
1112 new_to_type
= R_386_TLS_LE_32
;
1114 if (to_type
== R_386_TLS_GD
1115 || to_type
== R_386_TLS_GOTDESC
1116 || to_type
== R_386_TLS_DESC_CALL
)
1118 if (tls_type
== GOT_TLS_IE_POS
)
1119 new_to_type
= R_386_TLS_GOTIE
;
1120 else if (tls_type
& GOT_TLS_IE
)
1121 new_to_type
= R_386_TLS_IE_32
;
1124 /* We checked the transition before when we were called from
1125 elf_i386_check_relocs. We only want to check the new
1126 transition which hasn't been checked before. */
1127 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1128 to_type
= new_to_type
;
1134 if (bfd_link_executable (info
))
1135 to_type
= R_386_TLS_LE_32
;
1142 /* Return TRUE if there is no transition. */
1143 if (from_type
== to_type
)
1146 /* Check if the transition can be performed. */
1148 && ! elf_i386_check_tls_transition (sec
, contents
,
1149 symtab_hdr
, sym_hashes
,
1150 from_type
, rel
, relend
))
1152 reloc_howto_type
*from
, *to
;
1155 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1156 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1159 name
= h
->root
.root
.string
;
1162 struct elf_x86_link_hash_table
*htab
;
1164 htab
= elf_x86_hash_table (info
, I386_ELF_DATA
);
1169 Elf_Internal_Sym
*isym
;
1171 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1173 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1178 /* xgettext:c-format */
1179 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1180 "in section `%A' failed"),
1181 abfd
, from
->name
, to
->name
, name
,
1182 rel
->r_offset
, sec
);
1183 bfd_set_error (bfd_error_bad_value
);
1191 /* With the local symbol, foo, we convert
1192 mov foo@GOT[(%reg1)], %reg2
1194 lea foo[@GOTOFF(%reg1)], %reg2
1196 call/jmp *foo@GOT[(%reg)]
1198 nop call foo/jmp foo nop
1199 When PIC is false, convert
1200 test %reg1, foo@GOT[(%reg2)]
1204 binop foo@GOT[(%reg1)], %reg2
1207 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1212 elf_i386_convert_load_reloc (bfd
*abfd
, Elf_Internal_Shdr
*symtab_hdr
,
1214 unsigned int *r_type_p
,
1215 Elf_Internal_Rela
*irel
,
1216 struct elf_link_hash_entry
*h
,
1217 struct bfd_link_info
*link_info
)
1219 struct elf_x86_link_hash_table
*htab
;
1220 unsigned int opcode
;
1222 bfd_boolean baseless
;
1223 Elf_Internal_Sym
*isym
;
1224 unsigned int addend
;
1228 bfd_boolean to_reloc_32
;
1229 unsigned int r_type
;
1230 unsigned int r_symndx
;
1231 bfd_vma roff
= irel
->r_offset
;
1236 /* Addend for R_386_GOT32X relocations must be 0. */
1237 addend
= bfd_get_32 (abfd
, contents
+ roff
);
1241 htab
= elf_x86_hash_table (link_info
, I386_ELF_DATA
);
1242 is_pic
= bfd_link_pic (link_info
);
1245 r_symndx
= ELF32_R_SYM (irel
->r_info
);
1247 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1248 baseless
= (modrm
& 0xc7) == 0x5;
1250 if (baseless
&& is_pic
)
1252 /* For PIC, disallow R_386_GOT32X without a base register
1253 since we don't know what the GOT base is. */
1258 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
, abfd
,
1260 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1263 name
= h
->root
.root
.string
;
1266 /* xgettext:c-format */
1267 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1268 " register can not be used when making a shared object"),
1273 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1275 /* Convert to R_386_32 if PIC is false or there is no base
1277 to_reloc_32
= !is_pic
|| baseless
;
1279 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1283 if (opcode
== 0x0ff)
1284 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1285 goto convert_branch
;
1287 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1288 "test %reg1, foo@GOT(%reg2)" and
1289 "binop foo@GOT[(%reg1)], %reg2". */
1293 /* Undefined weak symbol is only bound locally in executable
1294 and its reference is resolved as 0. */
1295 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info
, I386_ELF_DATA
, TRUE
,
1296 elf_x86_hash_entry (h
)))
1300 /* No direct branch to 0 for PIC. */
1304 goto convert_branch
;
1308 /* We can convert load of address 0 to R_386_32. */
1316 /* We have "call/jmp *foo@GOT[(%reg)]". */
1317 if ((h
->root
.type
== bfd_link_hash_defined
1318 || h
->root
.type
== bfd_link_hash_defweak
)
1319 && SYMBOL_REFERENCES_LOCAL_P (link_info
, h
))
1321 /* The function is locally defined. */
1323 /* Convert R_386_GOT32X to R_386_PC32. */
1324 if (modrm
== 0x15 || (modrm
& 0xf8) == 0x90)
1326 struct elf_x86_link_hash_entry
*eh
1327 = (struct elf_x86_link_hash_entry
*) h
;
1329 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1332 /* To support TLS optimization, always use addr32 prefix
1333 for "call *___tls_get_addr@GOT(%reg)". */
1334 if (eh
&& eh
->tls_get_addr
)
1337 nop_offset
= irel
->r_offset
- 2;
1341 nop
= link_info
->call_nop_byte
;
1342 if (link_info
->call_nop_as_suffix
)
1344 nop_offset
= roff
+ 3;
1345 irel
->r_offset
-= 1;
1348 nop_offset
= roff
- 2;
1353 /* Convert to "jmp foo nop". */
1356 nop_offset
= roff
+ 3;
1357 irel
->r_offset
-= 1;
1360 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
1361 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
1362 /* When converting to PC-relative relocation, we
1363 need to adjust addend by -4. */
1364 bfd_put_32 (abfd
, -4, contents
+ irel
->r_offset
);
1365 irel
->r_info
= ELF32_R_INFO (r_symndx
, R_386_PC32
);
1366 *r_type_p
= R_386_PC32
;
1371 /* We have "mov foo@GOT[(%re1g)], %reg2",
1372 "test %reg1, foo@GOT(%reg2)" and
1373 "binop foo@GOT[(%reg1)], %reg2".
1375 Avoid optimizing _DYNAMIC since ld.so may use its
1376 link-time address. */
1377 if (h
== htab
->elf
.hdynamic
)
1380 /* def_regular is set by an assignment in a linker script in
1381 bfd_elf_record_link_assignment. start_stop is set on
1382 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1385 || h
->root
.type
== bfd_link_hash_defined
1386 || h
->root
.type
== bfd_link_hash_defweak
)
1387 && SYMBOL_REFERENCES_LOCAL_P (link_info
, h
)))
1394 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1395 "mov $foo, %reg2" with R_386_32. */
1397 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1398 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1403 /* Convert "mov foo@GOT(%reg1), %reg2" to
1404 "lea foo@GOTOFF(%reg1), %reg2". */
1405 r_type
= R_386_GOTOFF
;
1411 /* Only R_386_32 is supported. */
1417 /* Convert "test %reg1, foo@GOT(%reg2)" to
1418 "test $foo, %reg1". */
1419 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1424 /* Convert "binop foo@GOT(%reg1), %reg2" to
1425 "binop $foo, %reg2". */
1427 | (modrm
& 0x38) >> 3
1431 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1435 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
1436 irel
->r_info
= ELF32_R_INFO (r_symndx
, r_type
);
1444 /* Rename some of the generic section flags to better document how they
1446 #define check_relocs_failed sec_flg0
1448 /* Look through the relocs for a section during the first phase, and
1449 calculate needed space in the global offset table, procedure linkage
1450 table, and dynamic reloc sections. */
1453 elf_i386_check_relocs (bfd
*abfd
,
1454 struct bfd_link_info
*info
,
1456 const Elf_Internal_Rela
*relocs
)
1458 struct elf_x86_link_hash_table
*htab
;
1459 Elf_Internal_Shdr
*symtab_hdr
;
1460 struct elf_link_hash_entry
**sym_hashes
;
1461 const Elf_Internal_Rela
*rel
;
1462 const Elf_Internal_Rela
*rel_end
;
1466 if (bfd_link_relocatable (info
))
1469 /* Don't do anything special with non-loaded, non-alloced sections.
1470 In particular, any relocs in such sections should not affect GOT
1471 and PLT reference counting (ie. we don't allow them to create GOT
1472 or PLT entries), there's no possibility or desire to optimize TLS
1473 relocs, and there's not much point in propagating relocs to shared
1474 libs that the dynamic linker won't relocate. */
1475 if ((sec
->flags
& SEC_ALLOC
) == 0)
1478 htab
= elf_x86_hash_table (info
, I386_ELF_DATA
);
1481 sec
->check_relocs_failed
= 1;
1485 BFD_ASSERT (is_x86_elf (abfd
, htab
));
1487 /* Get the section contents. */
1488 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1489 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1490 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1492 sec
->check_relocs_failed
= 1;
1496 symtab_hdr
= &elf_symtab_hdr (abfd
);
1497 sym_hashes
= elf_sym_hashes (abfd
);
1501 rel_end
= relocs
+ sec
->reloc_count
;
1502 for (rel
= relocs
; rel
< rel_end
; rel
++)
1504 unsigned int r_type
;
1505 unsigned int r_symndx
;
1506 struct elf_link_hash_entry
*h
;
1507 struct elf_x86_link_hash_entry
*eh
;
1508 Elf_Internal_Sym
*isym
;
1510 bfd_boolean size_reloc
;
1512 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1513 r_type
= ELF32_R_TYPE (rel
->r_info
);
1515 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1517 /* xgettext:c-format */
1518 _bfd_error_handler (_("%B: bad symbol index: %d"),
1523 if (r_symndx
< symtab_hdr
->sh_info
)
1525 /* A local symbol. */
1526 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1531 /* Check relocation against local STT_GNU_IFUNC symbol. */
1532 if (ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1534 h
= _bfd_elf_x86_get_local_sym_hash (htab
, abfd
, rel
, TRUE
);
1538 /* Fake a STT_GNU_IFUNC symbol. */
1539 h
->root
.root
.string
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1541 h
->type
= STT_GNU_IFUNC
;
1544 h
->forced_local
= 1;
1545 h
->root
.type
= bfd_link_hash_defined
;
1553 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1554 while (h
->root
.type
== bfd_link_hash_indirect
1555 || h
->root
.type
== bfd_link_hash_warning
)
1556 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1559 eh
= (struct elf_x86_link_hash_entry
*) h
;
1562 if (r_type
== R_386_GOTOFF
)
1565 /* It is referenced by a non-shared object. */
1567 h
->root
.non_ir_ref_regular
= 1;
1569 if (h
->type
== STT_GNU_IFUNC
)
1570 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1571 |= elf_gnu_symbol_ifunc
;
1574 if (r_type
== R_386_GOT32X
1575 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1577 Elf_Internal_Rela
*irel
= (Elf_Internal_Rela
*) rel
;
1578 if (!elf_i386_convert_load_reloc (abfd
, symtab_hdr
, contents
,
1579 &r_type
, irel
, h
, info
))
1583 if (! elf_i386_tls_transition (info
, abfd
, sec
, contents
,
1584 symtab_hdr
, sym_hashes
,
1585 &r_type
, GOT_UNKNOWN
,
1586 rel
, rel_end
, h
, r_symndx
, FALSE
))
1592 htab
->tls_ld_or_ldm_got
.refcount
+= 1;
1596 /* This symbol requires a procedure linkage table entry. We
1597 actually build the entry in adjust_dynamic_symbol,
1598 because this might be a case of linking PIC code which is
1599 never referenced by a dynamic object, in which case we
1600 don't need to generate a procedure linkage table entry
1603 /* If this is a local symbol, we resolve it directly without
1604 creating a procedure linkage table entry. */
1608 eh
->has_got_reloc
= 1;
1610 h
->plt
.refcount
+= 1;
1617 case R_386_TLS_IE_32
:
1619 case R_386_TLS_GOTIE
:
1620 if (!bfd_link_executable (info
))
1621 info
->flags
|= DF_STATIC_TLS
;
1627 case R_386_TLS_GOTDESC
:
1628 case R_386_TLS_DESC_CALL
:
1629 /* This symbol requires a global offset table entry. */
1631 int tls_type
, old_tls_type
;
1638 tls_type
= GOT_NORMAL
;
1640 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
1641 case R_386_TLS_GOTDESC
:
1642 case R_386_TLS_DESC_CALL
:
1643 tls_type
= GOT_TLS_GDESC
; break;
1644 case R_386_TLS_IE_32
:
1645 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
1646 tls_type
= GOT_TLS_IE_NEG
;
1648 /* If this is a GD->IE transition, we may use either of
1649 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1650 tls_type
= GOT_TLS_IE
;
1653 case R_386_TLS_GOTIE
:
1654 tls_type
= GOT_TLS_IE_POS
; break;
1659 h
->got
.refcount
+= 1;
1660 old_tls_type
= elf_x86_hash_entry (h
)->tls_type
;
1664 bfd_signed_vma
*local_got_refcounts
;
1666 /* This is a global offset table entry for a local symbol. */
1667 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1668 if (local_got_refcounts
== NULL
)
1672 size
= symtab_hdr
->sh_info
;
1673 size
*= (sizeof (bfd_signed_vma
)
1674 + sizeof (bfd_vma
) + sizeof(char));
1675 local_got_refcounts
= (bfd_signed_vma
*)
1676 bfd_zalloc (abfd
, size
);
1677 if (local_got_refcounts
== NULL
)
1679 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1680 elf_x86_local_tlsdesc_gotent (abfd
)
1681 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1682 elf_x86_local_got_tls_type (abfd
)
1683 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1685 local_got_refcounts
[r_symndx
] += 1;
1686 old_tls_type
= elf_x86_local_got_tls_type (abfd
) [r_symndx
];
1689 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1690 tls_type
|= old_tls_type
;
1691 /* If a TLS symbol is accessed using IE at least once,
1692 there is no point to use dynamic model for it. */
1693 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1694 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1695 || (tls_type
& GOT_TLS_IE
) == 0))
1697 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
1698 tls_type
= old_tls_type
;
1699 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1700 && GOT_TLS_GD_ANY_P (tls_type
))
1701 tls_type
|= old_tls_type
;
1705 name
= h
->root
.root
.string
;
1707 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1710 /* xgettext:c-format */
1711 (_("%B: `%s' accessed both as normal and "
1712 "thread local symbol"),
1714 bfd_set_error (bfd_error_bad_value
);
1719 if (old_tls_type
!= tls_type
)
1722 elf_x86_hash_entry (h
)->tls_type
= tls_type
;
1724 elf_x86_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1732 if (r_type
!= R_386_TLS_IE
)
1735 eh
->has_got_reloc
= 1;
1740 case R_386_TLS_LE_32
:
1743 eh
->has_got_reloc
= 1;
1744 if (bfd_link_executable (info
))
1746 info
->flags
|= DF_STATIC_TLS
;
1751 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
1752 eh
->has_non_got_reloc
= 1;
1754 /* We are called after all symbols have been resolved. Only
1755 relocation against STT_GNU_IFUNC symbol must go through
1758 && (bfd_link_executable (info
)
1759 || h
->type
== STT_GNU_IFUNC
))
1761 /* If this reloc is in a read-only section, we might
1762 need a copy reloc. We can't check reliably at this
1763 stage whether the section is read-only, as input
1764 sections have not yet been mapped to output sections.
1765 Tentatively set the flag for now, and correct in
1766 adjust_dynamic_symbol. */
1769 /* We may need a .plt entry if the symbol is a function
1770 defined in a shared lib or is a STT_GNU_IFUNC function
1771 referenced from the code or read-only section. */
1773 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
1774 h
->plt
.refcount
+= 1;
1776 if (r_type
== R_386_PC32
)
1778 /* Since something like ".long foo - ." may be used
1779 as pointer, make sure that PLT is used if foo is
1780 a function defined in a shared library. */
1781 if ((sec
->flags
& SEC_CODE
) == 0)
1782 h
->pointer_equality_needed
= 1;
1783 else if (h
->type
== STT_GNU_IFUNC
1784 && bfd_link_pic (info
))
1787 /* xgettext:c-format */
1788 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1789 abfd
, h
->root
.root
.string
);
1790 bfd_set_error (bfd_error_bad_value
);
1796 h
->pointer_equality_needed
= 1;
1797 /* R_386_32 can be resolved at run-time. */
1798 if (r_type
== R_386_32
1799 && (sec
->flags
& SEC_READONLY
) == 0)
1800 eh
->func_pointer_refcount
+= 1;
1806 /* If we are creating a shared library, and this is a reloc
1807 against a global symbol, or a non PC relative reloc
1808 against a local symbol, then we need to copy the reloc
1809 into the shared library. However, if we are linking with
1810 -Bsymbolic, we do not need to copy a reloc against a
1811 global symbol which is defined in an object we are
1812 including in the link (i.e., DEF_REGULAR is set). At
1813 this point we have not seen all the input files, so it is
1814 possible that DEF_REGULAR is not set now but will be set
1815 later (it is never cleared). In case of a weak definition,
1816 DEF_REGULAR may be cleared later by a strong definition in
1817 a shared library. We account for that possibility below by
1818 storing information in the relocs_copied field of the hash
1819 table entry. A similar situation occurs when creating
1820 shared libraries and symbol visibility changes render the
1823 If on the other hand, we are creating an executable, we
1824 may need to keep relocations for symbols satisfied by a
1825 dynamic library if we manage to avoid copy relocs for the
1828 Generate dynamic pointer relocation against STT_GNU_IFUNC
1829 symbol in the non-code section. */
1830 if ((bfd_link_pic (info
)
1831 && (r_type
!= R_386_PC32
1833 && (! (bfd_link_pie (info
)
1834 || SYMBOLIC_BIND (info
, h
))
1835 || h
->root
.type
== bfd_link_hash_defweak
1836 || !h
->def_regular
))))
1838 && h
->type
== STT_GNU_IFUNC
1839 && r_type
== R_386_32
1840 && (sec
->flags
& SEC_CODE
) == 0)
1841 || (ELIMINATE_COPY_RELOCS
1842 && !bfd_link_pic (info
)
1844 && (h
->root
.type
== bfd_link_hash_defweak
1845 || !h
->def_regular
)))
1847 struct elf_dyn_relocs
*p
;
1848 struct elf_dyn_relocs
**head
;
1850 /* We must copy these reloc types into the output file.
1851 Create a reloc section in dynobj and make room for
1855 sreloc
= _bfd_elf_make_dynamic_reloc_section
1856 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
1862 /* If this is a global symbol, we count the number of
1863 relocations we need for this symbol. */
1866 head
= &eh
->dyn_relocs
;
1870 /* Track dynamic relocs needed for local syms too.
1871 We really need local syms available to do this
1876 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1881 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1885 vpp
= &elf_section_data (s
)->local_dynrel
;
1886 head
= (struct elf_dyn_relocs
**)vpp
;
1890 if (p
== NULL
|| p
->sec
!= sec
)
1892 bfd_size_type amt
= sizeof *p
;
1893 p
= (struct elf_dyn_relocs
*) bfd_alloc (htab
->elf
.dynobj
,
1905 /* Count size relocation as PC-relative relocation. */
1906 if (r_type
== R_386_PC32
|| size_reloc
)
1911 /* This relocation describes the C++ object vtable hierarchy.
1912 Reconstruct it for later use during GC. */
1913 case R_386_GNU_VTINHERIT
:
1914 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1918 /* This relocation describes which C++ vtable entries are actually
1919 used. Record for later use during GC. */
1920 case R_386_GNU_VTENTRY
:
1921 BFD_ASSERT (h
!= NULL
);
1923 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1932 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
1934 if (!info
->keep_memory
)
1938 /* Cache the section contents for elf_link_input_bfd. */
1939 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1946 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
1948 sec
->check_relocs_failed
= 1;
1952 /* Set the correct type for an x86 ELF section. We do this by the
1953 section name, which is a hack, but ought to work. */
1956 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
1957 Elf_Internal_Shdr
*hdr
,
1962 name
= bfd_get_section_name (abfd
, sec
);
1964 /* This is an ugly, but unfortunately necessary hack that is
1965 needed when producing EFI binaries on x86. It tells
1966 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1967 containing ELF relocation info. We need this hack in order to
1968 be able to generate ELF binaries that can be translated into
1969 EFI applications (which are essentially COFF objects). Those
1970 files contain a COFF ".reloc" section inside an ELFNN object,
1971 which would normally cause BFD to segfault because it would
1972 attempt to interpret this section as containing relocation
1973 entries for section "oc". With this hack enabled, ".reloc"
1974 will be treated as a normal data section, which will avoid the
1975 segfault. However, you won't be able to create an ELFNN binary
1976 with a section named "oc" that needs relocations, but that's
1977 the kind of ugly side-effects you get when detecting section
1978 types based on their names... In practice, this limitation is
1979 unlikely to bite. */
1980 if (strcmp (name
, ".reloc") == 0)
1981 hdr
->sh_type
= SHT_PROGBITS
;
1986 /* Return the relocation value for @tpoff relocation
1987 if STT_TLS virtual address is ADDRESS. */
1990 elf_i386_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
1992 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
1993 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
1994 bfd_vma static_tls_size
;
1996 /* If tls_sec is NULL, we should have signalled an error already. */
1997 if (htab
->tls_sec
== NULL
)
2000 /* Consider special static TLS alignment requirements. */
2001 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2002 return static_tls_size
+ htab
->tls_sec
->vma
- address
;
2005 /* Relocate an i386 ELF section. */
2008 elf_i386_relocate_section (bfd
*output_bfd
,
2009 struct bfd_link_info
*info
,
2011 asection
*input_section
,
2013 Elf_Internal_Rela
*relocs
,
2014 Elf_Internal_Sym
*local_syms
,
2015 asection
**local_sections
)
2017 struct elf_x86_link_hash_table
*htab
;
2018 Elf_Internal_Shdr
*symtab_hdr
;
2019 struct elf_link_hash_entry
**sym_hashes
;
2020 bfd_vma
*local_got_offsets
;
2021 bfd_vma
*local_tlsdesc_gotents
;
2022 Elf_Internal_Rela
*rel
;
2023 Elf_Internal_Rela
*wrel
;
2024 Elf_Internal_Rela
*relend
;
2025 bfd_boolean is_vxworks_tls
;
2026 unsigned plt_entry_size
;
2028 /* Skip if check_relocs failed. */
2029 if (input_section
->check_relocs_failed
)
2032 htab
= elf_x86_hash_table (info
, I386_ELF_DATA
);
2036 BFD_ASSERT (is_x86_elf (input_bfd
, htab
));
2038 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2039 sym_hashes
= elf_sym_hashes (input_bfd
);
2040 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2041 local_tlsdesc_gotents
= elf_x86_local_tlsdesc_gotent (input_bfd
);
2042 /* We have to handle relocations in vxworks .tls_vars sections
2043 specially, because the dynamic loader is 'weird'. */
2044 is_vxworks_tls
= (htab
->is_vxworks
2045 && bfd_link_pic (info
)
2046 && !strcmp (input_section
->output_section
->name
,
2049 _bfd_x86_elf_set_tls_module_base (info
);
2051 plt_entry_size
= htab
->plt
.plt_entry_size
;
2053 rel
= wrel
= relocs
;
2054 relend
= relocs
+ input_section
->reloc_count
;
2055 for (; rel
< relend
; wrel
++, rel
++)
2057 unsigned int r_type
, r_type_tls
;
2058 reloc_howto_type
*howto
;
2059 unsigned long r_symndx
;
2060 struct elf_link_hash_entry
*h
;
2061 struct elf_x86_link_hash_entry
*eh
;
2062 Elf_Internal_Sym
*sym
;
2064 bfd_vma off
, offplt
, plt_offset
;
2066 bfd_boolean unresolved_reloc
;
2067 bfd_reloc_status_type r
;
2071 asection
*resolved_plt
;
2072 bfd_boolean resolved_to_zero
;
2073 bfd_boolean relative_reloc
;
2075 r_type
= ELF32_R_TYPE (rel
->r_info
);
2076 if (r_type
== R_386_GNU_VTINHERIT
2077 || r_type
== R_386_GNU_VTENTRY
)
2084 if ((indx
= r_type
) >= R_386_standard
2085 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
2086 >= R_386_ext
- R_386_standard
)
2087 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
2088 >= R_386_ext2
- R_386_ext
))
2089 return _bfd_unrecognized_reloc (input_bfd
, input_section
, r_type
);
2091 howto
= elf_howto_table
+ indx
;
2093 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2097 unresolved_reloc
= FALSE
;
2098 if (r_symndx
< symtab_hdr
->sh_info
)
2100 sym
= local_syms
+ r_symndx
;
2101 sec
= local_sections
[r_symndx
];
2102 relocation
= (sec
->output_section
->vma
2103 + sec
->output_offset
2105 st_size
= sym
->st_size
;
2107 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
2108 && ((sec
->flags
& SEC_MERGE
) != 0
2109 || (bfd_link_relocatable (info
)
2110 && sec
->output_offset
!= 0)))
2113 bfd_byte
*where
= contents
+ rel
->r_offset
;
2115 switch (howto
->size
)
2118 addend
= bfd_get_8 (input_bfd
, where
);
2119 if (howto
->pc_relative
)
2121 addend
= (addend
^ 0x80) - 0x80;
2126 addend
= bfd_get_16 (input_bfd
, where
);
2127 if (howto
->pc_relative
)
2129 addend
= (addend
^ 0x8000) - 0x8000;
2134 addend
= bfd_get_32 (input_bfd
, where
);
2135 if (howto
->pc_relative
)
2137 addend
= (addend
^ 0x80000000) - 0x80000000;
2145 if (bfd_link_relocatable (info
))
2146 addend
+= sec
->output_offset
;
2149 asection
*msec
= sec
;
2150 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
2152 addend
-= relocation
;
2153 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2156 switch (howto
->size
)
2159 /* FIXME: overflow checks. */
2160 if (howto
->pc_relative
)
2162 bfd_put_8 (input_bfd
, addend
, where
);
2165 if (howto
->pc_relative
)
2167 bfd_put_16 (input_bfd
, addend
, where
);
2170 if (howto
->pc_relative
)
2172 bfd_put_32 (input_bfd
, addend
, where
);
2176 else if (!bfd_link_relocatable (info
)
2177 && ELF32_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2179 /* Relocate against local STT_GNU_IFUNC symbol. */
2180 h
= _bfd_elf_x86_get_local_sym_hash (htab
, input_bfd
, rel
,
2185 /* Set STT_GNU_IFUNC symbol value. */
2186 h
->root
.u
.def
.value
= sym
->st_value
;
2187 h
->root
.u
.def
.section
= sec
;
2192 bfd_boolean warned ATTRIBUTE_UNUSED
;
2193 bfd_boolean ignored ATTRIBUTE_UNUSED
;
2195 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2196 r_symndx
, symtab_hdr
, sym_hashes
,
2198 unresolved_reloc
, warned
, ignored
);
2202 if (sec
!= NULL
&& discarded_section (sec
))
2204 _bfd_clear_contents (howto
, input_bfd
, input_section
,
2205 contents
+ rel
->r_offset
);
2206 wrel
->r_offset
= rel
->r_offset
;
2210 /* For ld -r, remove relocations in debug sections against
2211 sections defined in discarded sections. Not done for
2212 eh_frame editing code expects to be present. */
2213 if (bfd_link_relocatable (info
)
2214 && (input_section
->flags
& SEC_DEBUGGING
))
2220 if (bfd_link_relocatable (info
))
2227 eh
= (struct elf_x86_link_hash_entry
*) h
;
2229 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2230 it here if it is defined in a non-shared object. */
2232 && h
->type
== STT_GNU_IFUNC
2235 asection
*gotplt
, *base_got
;
2239 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2241 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2242 sections because such sections are not SEC_ALLOC and
2243 thus ld.so will not process them. */
2244 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
2249 /* STT_GNU_IFUNC symbol must go through PLT. */
2250 if (htab
->elf
.splt
!= NULL
)
2252 if (htab
->plt_second
!= NULL
)
2254 resolved_plt
= htab
->plt_second
;
2255 plt_offset
= eh
->plt_second
.offset
;
2259 resolved_plt
= htab
->elf
.splt
;
2260 plt_offset
= h
->plt
.offset
;
2262 gotplt
= htab
->elf
.sgotplt
;
2266 resolved_plt
= htab
->elf
.iplt
;
2267 plt_offset
= h
->plt
.offset
;
2268 gotplt
= htab
->elf
.igotplt
;
2278 base_got
= htab
->elf
.sgot
;
2279 off
= h
->got
.offset
;
2281 if (base_got
== NULL
)
2284 if (off
== (bfd_vma
) -1)
2286 /* We can't use h->got.offset here to save state, or
2287 even just remember the offset, as finish_dynamic_symbol
2288 would use that as offset into .got. */
2290 if (h
->plt
.offset
== (bfd_vma
) -1)
2293 if (htab
->elf
.splt
!= NULL
)
2295 plt_index
= (h
->plt
.offset
/ plt_entry_size
2296 - htab
->plt
.has_plt0
);
2297 off
= (plt_index
+ 3) * 4;
2298 base_got
= htab
->elf
.sgotplt
;
2302 plt_index
= h
->plt
.offset
/ plt_entry_size
;
2303 off
= plt_index
* 4;
2304 base_got
= htab
->elf
.igotplt
;
2307 if (h
->dynindx
== -1
2311 /* This references the local defitionion. We must
2312 initialize this entry in the global offset table.
2313 Since the offset must always be a multiple of 8,
2314 we use the least significant bit to record
2315 whether we have initialized it already.
2317 When doing a dynamic link, we create a .rela.got
2318 relocation entry to initialize the value. This
2319 is done in the finish_dynamic_symbol routine. */
2324 bfd_put_32 (output_bfd
, relocation
,
2325 base_got
->contents
+ off
);
2333 relocation
= (base_got
->output_section
->vma
2334 + base_got
->output_offset
+ off
2335 - gotplt
->output_section
->vma
2336 - gotplt
->output_offset
);
2338 if (rel
->r_offset
> 1
2339 && (*(contents
+ rel
->r_offset
- 1) & 0xc7) == 0x5
2340 && *(contents
+ rel
->r_offset
- 2) != 0x8d)
2342 if (bfd_link_pic (info
))
2343 goto disallow_got32
;
2345 /* Add the GOT base if there is no base register. */
2346 relocation
+= (gotplt
->output_section
->vma
2347 + gotplt
->output_offset
);
2349 else if (htab
->elf
.splt
== NULL
)
2351 /* Adjust for static executables. */
2352 relocation
+= gotplt
->output_offset
;
2358 if (h
->plt
.offset
== (bfd_vma
) -1)
2360 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2361 if (r_type
== R_386_32
2362 && (input_section
->flags
& SEC_CODE
) == 0)
2363 goto do_ifunc_pointer
;
2364 goto bad_ifunc_reloc
;
2367 relocation
= (resolved_plt
->output_section
->vma
2368 + resolved_plt
->output_offset
+ plt_offset
);
2374 if (h
->root
.root
.string
)
2375 name
= h
->root
.root
.string
;
2377 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2380 /* xgettext:c-format */
2381 (_("%B: relocation %s against STT_GNU_IFUNC "
2382 "symbol `%s' isn't supported"), input_bfd
,
2384 bfd_set_error (bfd_error_bad_value
);
2388 /* Generate dynamic relcoation only when there is a
2389 non-GOT reference in a shared object. */
2390 if ((bfd_link_pic (info
) && h
->non_got_ref
)
2391 || h
->plt
.offset
== (bfd_vma
) -1)
2393 Elf_Internal_Rela outrel
;
2398 /* Need a dynamic relocation to get the real function
2400 offset
= _bfd_elf_section_offset (output_bfd
,
2404 if (offset
== (bfd_vma
) -1
2405 || offset
== (bfd_vma
) -2)
2408 outrel
.r_offset
= (input_section
->output_section
->vma
2409 + input_section
->output_offset
2412 if (h
->dynindx
== -1
2414 || bfd_link_executable (info
))
2416 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
2417 h
->root
.root
.string
,
2418 h
->root
.u
.def
.section
->owner
);
2420 /* This symbol is resolved locally. */
2421 outrel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
2422 bfd_put_32 (output_bfd
,
2423 (h
->root
.u
.def
.value
2424 + h
->root
.u
.def
.section
->output_section
->vma
2425 + h
->root
.u
.def
.section
->output_offset
),
2429 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2431 /* Dynamic relocations are stored in
2432 1. .rel.ifunc section in PIC object.
2433 2. .rel.got section in dynamic executable.
2434 3. .rel.iplt section in static executable. */
2435 if (bfd_link_pic (info
))
2436 sreloc
= htab
->elf
.irelifunc
;
2437 else if (htab
->elf
.splt
!= NULL
)
2438 sreloc
= htab
->elf
.srelgot
;
2440 sreloc
= htab
->elf
.irelplt
;
2441 elf_append_rel (output_bfd
, sreloc
, &outrel
);
2443 /* If this reloc is against an external symbol, we
2444 do not want to fiddle with the addend. Otherwise,
2445 we need to include the symbol value so that it
2446 becomes an addend for the dynamic reloc. For an
2447 internal symbol, we have updated addend. */
2456 relocation
-= (gotplt
->output_section
->vma
2457 + gotplt
->output_offset
);
2462 resolved_to_zero
= (eh
!= NULL
2463 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
2471 /* Avoid optimizing _DYNAMIC since ld.so may use its
2472 link-time address. */
2473 if (h
== htab
->elf
.hdynamic
)
2476 if (bfd_link_pic (info
))
2478 /* It is OK to convert mov to lea and convert indirect
2479 branch to direct branch. It is OK to convert adc,
2480 add, and, cmp, or, sbb, sub, test, xor only when PIC
2482 unsigned int opcode
, addend
;
2483 addend
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2486 opcode
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2487 if (opcode
!= 0x8b && opcode
!= 0xff)
2491 /* Resolve "mov GOT[(%reg)], %reg",
2492 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2493 and "binop foo@GOT[(%reg)], %reg". */
2495 || (h
->plt
.offset
== (bfd_vma
) -1
2496 && h
->got
.offset
== (bfd_vma
) -1)
2497 || htab
->elf
.sgotplt
== NULL
)
2500 offplt
= (htab
->elf
.sgotplt
->output_section
->vma
2501 + htab
->elf
.sgotplt
->output_offset
);
2503 /* It is relative to .got.plt section. */
2504 if (h
->got
.offset
!= (bfd_vma
) -1)
2505 /* Use GOT entry. Mask off the least significant bit in
2506 GOT offset which may be set by R_386_GOT32 processing
2508 relocation
= (htab
->elf
.sgot
->output_section
->vma
2509 + htab
->elf
.sgot
->output_offset
2510 + (h
->got
.offset
& ~1) - offplt
);
2512 /* Use GOTPLT entry. */
2513 relocation
= (h
->plt
.offset
/ plt_entry_size
2514 - htab
->plt
.has_plt0
+ 3) * 4;
2516 if (!bfd_link_pic (info
))
2518 /* If not PIC, add the .got.plt section address for
2519 baseless addressing. */
2521 modrm
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2522 if ((modrm
& 0xc7) == 0x5)
2523 relocation
+= offplt
;
2526 unresolved_reloc
= FALSE
;
2531 /* Relocation is to the entry for this symbol in the global
2533 if (htab
->elf
.sgot
== NULL
)
2536 relative_reloc
= FALSE
;
2541 off
= h
->got
.offset
;
2542 dyn
= htab
->elf
.dynamic_sections_created
;
2543 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
,
2544 bfd_link_pic (info
),
2546 || (bfd_link_pic (info
)
2547 && SYMBOL_REFERENCES_LOCAL_P (info
, h
))
2548 || (ELF_ST_VISIBILITY (h
->other
)
2549 && h
->root
.type
== bfd_link_hash_undefweak
))
2551 /* This is actually a static link, or it is a
2552 -Bsymbolic link and the symbol is defined
2553 locally, or the symbol was forced to be local
2554 because of a version file. We must initialize
2555 this entry in the global offset table. Since the
2556 offset must always be a multiple of 4, we use the
2557 least significant bit to record whether we have
2558 initialized it already.
2560 When doing a dynamic link, we create a .rel.got
2561 relocation entry to initialize the value. This
2562 is done in the finish_dynamic_symbol routine. */
2567 bfd_put_32 (output_bfd
, relocation
,
2568 htab
->elf
.sgot
->contents
+ off
);
2571 if (h
->dynindx
== -1
2573 && h
->root
.type
!= bfd_link_hash_undefweak
2574 && bfd_link_pic (info
))
2576 /* PR ld/21402: If this symbol isn't dynamic
2577 in PIC, generate R_386_RELATIVE here. */
2578 eh
->no_finish_dynamic_symbol
= 1;
2579 relative_reloc
= TRUE
;
2584 unresolved_reloc
= FALSE
;
2588 if (local_got_offsets
== NULL
)
2591 off
= local_got_offsets
[r_symndx
];
2593 /* The offset must always be a multiple of 4. We use
2594 the least significant bit to record whether we have
2595 already generated the necessary reloc. */
2600 bfd_put_32 (output_bfd
, relocation
,
2601 htab
->elf
.sgot
->contents
+ off
);
2602 local_got_offsets
[r_symndx
] |= 1;
2604 if (bfd_link_pic (info
))
2605 relative_reloc
= TRUE
;
2612 Elf_Internal_Rela outrel
;
2614 s
= htab
->elf
.srelgot
;
2618 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
2619 + htab
->elf
.sgot
->output_offset
2621 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2622 elf_append_rel (output_bfd
, s
, &outrel
);
2625 if (off
>= (bfd_vma
) -2)
2628 relocation
= (htab
->elf
.sgot
->output_section
->vma
2629 + htab
->elf
.sgot
->output_offset
+ off
);
2630 if (rel
->r_offset
> 1
2631 && (*(contents
+ rel
->r_offset
- 1) & 0xc7) == 0x5
2632 && *(contents
+ rel
->r_offset
- 2) != 0x8d)
2634 if (bfd_link_pic (info
))
2636 /* For PIC, disallow R_386_GOT32 without a base
2637 register, except for "lea foo@GOT, %reg", since
2638 we don't know what the GOT base is. */
2642 if (h
== NULL
|| h
->root
.root
.string
== NULL
)
2643 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2646 name
= h
->root
.root
.string
;
2649 /* xgettext:c-format */
2650 (_("%B: direct GOT relocation %s against `%s'"
2651 " without base register can not be used"
2652 " when making a shared object"),
2653 input_bfd
, howto
->name
, name
);
2654 bfd_set_error (bfd_error_bad_value
);
2660 /* Subtract the .got.plt section address only with a base
2662 relocation
-= (htab
->elf
.sgotplt
->output_section
->vma
2663 + htab
->elf
.sgotplt
->output_offset
);
2669 /* Relocation is relative to the start of the global offset
2672 /* Check to make sure it isn't a protected function or data
2673 symbol for shared library since it may not be local when
2674 used as function address or with copy relocation. We also
2675 need to make sure that a symbol is referenced locally. */
2676 if (!bfd_link_executable (info
) && h
)
2678 if (!h
->def_regular
)
2682 switch (ELF_ST_VISIBILITY (h
->other
))
2685 v
= _("hidden symbol");
2688 v
= _("internal symbol");
2691 v
= _("protected symbol");
2699 /* xgettext:c-format */
2700 (_("%B: relocation R_386_GOTOFF against undefined %s"
2701 " `%s' can not be used when making a shared object"),
2702 input_bfd
, v
, h
->root
.root
.string
);
2703 bfd_set_error (bfd_error_bad_value
);
2706 else if (!SYMBOL_REFERENCES_LOCAL_P (info
, h
)
2707 && (h
->type
== STT_FUNC
2708 || h
->type
== STT_OBJECT
)
2709 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2712 /* xgettext:c-format */
2713 (_("%B: relocation R_386_GOTOFF against protected %s"
2714 " `%s' can not be used when making a shared object"),
2716 h
->type
== STT_FUNC
? "function" : "data",
2717 h
->root
.root
.string
);
2718 bfd_set_error (bfd_error_bad_value
);
2723 /* Note that sgot is not involved in this
2724 calculation. We always want the start of .got.plt. If we
2725 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2726 permitted by the ABI, we might have to change this
2728 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2729 + htab
->elf
.sgotplt
->output_offset
;
2733 /* Use global offset table as symbol value. */
2734 relocation
= htab
->elf
.sgotplt
->output_section
->vma
2735 + htab
->elf
.sgotplt
->output_offset
;
2736 unresolved_reloc
= FALSE
;
2740 /* Relocation is to the entry for this symbol in the
2741 procedure linkage table. */
2743 /* Resolve a PLT32 reloc against a local symbol directly,
2744 without using the procedure linkage table. */
2748 if ((h
->plt
.offset
== (bfd_vma
) -1
2749 && eh
->plt_got
.offset
== (bfd_vma
) -1)
2750 || htab
->elf
.splt
== NULL
)
2752 /* We didn't make a PLT entry for this symbol. This
2753 happens when statically linking PIC code, or when
2754 using -Bsymbolic. */
2758 if (h
->plt
.offset
!= (bfd_vma
) -1)
2760 if (htab
->plt_second
!= NULL
)
2762 resolved_plt
= htab
->plt_second
;
2763 plt_offset
= eh
->plt_second
.offset
;
2767 resolved_plt
= htab
->elf
.splt
;
2768 plt_offset
= h
->plt
.offset
;
2773 resolved_plt
= htab
->plt_got
;
2774 plt_offset
= eh
->plt_got
.offset
;
2777 relocation
= (resolved_plt
->output_section
->vma
2778 + resolved_plt
->output_offset
2780 unresolved_reloc
= FALSE
;
2784 /* Set to symbol size. */
2785 relocation
= st_size
;
2790 if ((input_section
->flags
& SEC_ALLOC
) == 0
2794 /* Copy dynamic function pointer relocations. Don't generate
2795 dynamic relocations against resolved undefined weak symbols
2796 in PIE, except for R_386_PC32. */
2797 if ((bfd_link_pic (info
)
2799 || ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2800 && (!resolved_to_zero
2801 || r_type
== R_386_PC32
))
2802 || h
->root
.type
!= bfd_link_hash_undefweak
))
2803 && ((r_type
!= R_386_PC32
&& r_type
!= R_386_SIZE32
)
2804 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2805 || (ELIMINATE_COPY_RELOCS
2806 && !bfd_link_pic (info
)
2810 || eh
->func_pointer_refcount
> 0
2811 || (h
->root
.type
== bfd_link_hash_undefweak
2812 && !resolved_to_zero
))
2813 && ((h
->def_dynamic
&& !h
->def_regular
)
2814 /* Undefined weak symbol is bound locally when
2816 || h
->root
.type
== bfd_link_hash_undefweak
)))
2818 Elf_Internal_Rela outrel
;
2819 bfd_boolean skip
, relocate
;
2822 /* When generating a shared object, these relocations
2823 are copied into the output file to be resolved at run
2830 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2832 if (outrel
.r_offset
== (bfd_vma
) -1)
2834 else if (outrel
.r_offset
== (bfd_vma
) -2)
2835 skip
= TRUE
, relocate
= TRUE
;
2836 outrel
.r_offset
+= (input_section
->output_section
->vma
2837 + input_section
->output_offset
);
2840 memset (&outrel
, 0, sizeof outrel
);
2843 && (r_type
== R_386_PC32
2844 || !(bfd_link_executable (info
)
2845 || SYMBOLIC_BIND (info
, h
))
2846 || !h
->def_regular
))
2847 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2850 /* This symbol is local, or marked to become local. */
2852 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2855 sreloc
= elf_section_data (input_section
)->sreloc
;
2857 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
2859 r
= bfd_reloc_notsupported
;
2860 goto check_relocation_error
;
2863 elf_append_rel (output_bfd
, sreloc
, &outrel
);
2865 /* If this reloc is against an external symbol, we do
2866 not want to fiddle with the addend. Otherwise, we
2867 need to include the symbol value so that it becomes
2868 an addend for the dynamic reloc. */
2875 if (!bfd_link_executable (info
))
2877 Elf_Internal_Rela outrel
;
2880 outrel
.r_offset
= rel
->r_offset
2881 + input_section
->output_section
->vma
2882 + input_section
->output_offset
;
2883 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2884 sreloc
= elf_section_data (input_section
)->sreloc
;
2887 elf_append_rel (output_bfd
, sreloc
, &outrel
);
2892 case R_386_TLS_GOTDESC
:
2893 case R_386_TLS_DESC_CALL
:
2894 case R_386_TLS_IE_32
:
2895 case R_386_TLS_GOTIE
:
2896 tls_type
= GOT_UNKNOWN
;
2897 if (h
== NULL
&& local_got_offsets
)
2898 tls_type
= elf_x86_local_got_tls_type (input_bfd
) [r_symndx
];
2900 tls_type
= elf_x86_hash_entry(h
)->tls_type
;
2901 if (tls_type
== GOT_TLS_IE
)
2902 tls_type
= GOT_TLS_IE_NEG
;
2904 r_type_tls
= r_type
;
2905 if (! elf_i386_tls_transition (info
, input_bfd
,
2906 input_section
, contents
,
2907 symtab_hdr
, sym_hashes
,
2908 &r_type_tls
, tls_type
, rel
,
2909 relend
, h
, r_symndx
, TRUE
))
2912 if (r_type_tls
== R_386_TLS_LE_32
)
2914 BFD_ASSERT (! unresolved_reloc
);
2915 if (r_type
== R_386_TLS_GD
)
2920 /* GD->LE transition. */
2921 type
= *(contents
+ rel
->r_offset
- 2);
2925 leal foo@tlsgd(,%ebx,1), %eax
2926 call ___tls_get_addr@PLT
2929 subl $foo@tpoff, %eax
2930 (6 byte form of subl). */
2931 roff
= rel
->r_offset
+ 5;
2936 leal foo@tlsgd(%ebx), %eax
2937 call ___tls_get_addr@PLT
2940 leal foo@tlsgd(%reg), %eax
2941 call *___tls_get_addr@GOT(%reg)
2942 which may be converted to
2943 addr32 call ___tls_get_addr
2945 movl %gs:0, %eax; subl $foo@tpoff, %eax
2946 (6 byte form of subl). */
2947 roff
= rel
->r_offset
+ 6;
2949 memcpy (contents
+ roff
- 8,
2950 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2951 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
2953 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2958 else if (r_type
== R_386_TLS_GOTDESC
)
2960 /* GDesc -> LE transition.
2961 It's originally something like:
2962 leal x@tlsdesc(%ebx), %eax
2966 Registers other than %eax may be set up here. */
2971 roff
= rel
->r_offset
;
2972 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2974 /* Now modify the instruction as appropriate. */
2975 /* aoliva FIXME: remove the above and xor the byte
2977 bfd_put_8 (output_bfd
, val
^ 0x86,
2978 contents
+ roff
- 1);
2979 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
2983 else if (r_type
== R_386_TLS_DESC_CALL
)
2985 /* GDesc -> LE transition.
2993 roff
= rel
->r_offset
;
2994 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
2995 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
2998 else if (r_type
== R_386_TLS_IE
)
3002 /* IE->LE transition:
3003 Originally it can be one of:
3011 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3014 /* movl foo, %eax. */
3015 bfd_put_8 (output_bfd
, 0xb8,
3016 contents
+ rel
->r_offset
- 1);
3022 type
= bfd_get_8 (input_bfd
,
3023 contents
+ rel
->r_offset
- 2);
3028 bfd_put_8 (output_bfd
, 0xc7,
3029 contents
+ rel
->r_offset
- 2);
3030 bfd_put_8 (output_bfd
,
3031 0xc0 | ((val
>> 3) & 7),
3032 contents
+ rel
->r_offset
- 1);
3036 bfd_put_8 (output_bfd
, 0x81,
3037 contents
+ rel
->r_offset
- 2);
3038 bfd_put_8 (output_bfd
,
3039 0xc0 | ((val
>> 3) & 7),
3040 contents
+ rel
->r_offset
- 1);
3047 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3048 contents
+ rel
->r_offset
);
3053 unsigned int val
, type
;
3055 /* {IE_32,GOTIE}->LE transition:
3056 Originally it can be one of:
3057 subl foo(%reg1), %reg2
3058 movl foo(%reg1), %reg2
3059 addl foo(%reg1), %reg2
3062 movl $foo, %reg2 (6 byte form)
3063 addl $foo, %reg2. */
3064 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3065 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3069 bfd_put_8 (output_bfd
, 0xc7,
3070 contents
+ rel
->r_offset
- 2);
3071 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3072 contents
+ rel
->r_offset
- 1);
3074 else if (type
== 0x2b)
3077 bfd_put_8 (output_bfd
, 0x81,
3078 contents
+ rel
->r_offset
- 2);
3079 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
3080 contents
+ rel
->r_offset
- 1);
3082 else if (type
== 0x03)
3085 bfd_put_8 (output_bfd
, 0x81,
3086 contents
+ rel
->r_offset
- 2);
3087 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3088 contents
+ rel
->r_offset
- 1);
3092 if (r_type
== R_386_TLS_GOTIE
)
3093 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3094 contents
+ rel
->r_offset
);
3096 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
3097 contents
+ rel
->r_offset
);
3102 if (htab
->elf
.sgot
== NULL
)
3107 off
= h
->got
.offset
;
3108 offplt
= elf_x86_hash_entry (h
)->tlsdesc_got
;
3112 if (local_got_offsets
== NULL
)
3115 off
= local_got_offsets
[r_symndx
];
3116 offplt
= local_tlsdesc_gotents
[r_symndx
];
3123 Elf_Internal_Rela outrel
;
3127 if (htab
->elf
.srelgot
== NULL
)
3130 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3132 if (GOT_TLS_GDESC_P (tls_type
))
3135 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
3136 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
3137 <= htab
->elf
.sgotplt
->size
);
3138 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3139 + htab
->elf
.sgotplt
->output_offset
3141 + htab
->sgotplt_jump_table_size
);
3142 sreloc
= htab
->elf
.srelplt
;
3143 loc
= sreloc
->contents
;
3144 loc
+= (htab
->next_tls_desc_index
++
3145 * sizeof (Elf32_External_Rel
));
3146 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3147 <= sreloc
->contents
+ sreloc
->size
);
3148 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3151 BFD_ASSERT (! unresolved_reloc
);
3152 bfd_put_32 (output_bfd
,
3153 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3154 htab
->elf
.sgotplt
->contents
+ offplt
3155 + htab
->sgotplt_jump_table_size
+ 4);
3159 bfd_put_32 (output_bfd
, 0,
3160 htab
->elf
.sgotplt
->contents
+ offplt
3161 + htab
->sgotplt_jump_table_size
+ 4);
3165 sreloc
= htab
->elf
.srelgot
;
3167 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3168 + htab
->elf
.sgot
->output_offset
+ off
);
3170 if (GOT_TLS_GD_P (tls_type
))
3171 dr_type
= R_386_TLS_DTPMOD32
;
3172 else if (GOT_TLS_GDESC_P (tls_type
))
3174 else if (tls_type
== GOT_TLS_IE_POS
)
3175 dr_type
= R_386_TLS_TPOFF
;
3177 dr_type
= R_386_TLS_TPOFF32
;
3179 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
3180 bfd_put_32 (output_bfd
,
3181 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3182 htab
->elf
.sgot
->contents
+ off
);
3183 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
3184 bfd_put_32 (output_bfd
,
3185 _bfd_x86_elf_dtpoff_base (info
) - relocation
,
3186 htab
->elf
.sgot
->contents
+ off
);
3187 else if (dr_type
!= R_386_TLS_DESC
)
3188 bfd_put_32 (output_bfd
, 0,
3189 htab
->elf
.sgot
->contents
+ off
);
3190 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
3192 elf_append_rel (output_bfd
, sreloc
, &outrel
);
3194 if (GOT_TLS_GD_P (tls_type
))
3198 BFD_ASSERT (! unresolved_reloc
);
3199 bfd_put_32 (output_bfd
,
3200 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3201 htab
->elf
.sgot
->contents
+ off
+ 4);
3205 bfd_put_32 (output_bfd
, 0,
3206 htab
->elf
.sgot
->contents
+ off
+ 4);
3207 outrel
.r_info
= ELF32_R_INFO (indx
,
3208 R_386_TLS_DTPOFF32
);
3209 outrel
.r_offset
+= 4;
3210 elf_append_rel (output_bfd
, sreloc
, &outrel
);
3213 else if (tls_type
== GOT_TLS_IE_BOTH
)
3215 bfd_put_32 (output_bfd
,
3217 ? relocation
- _bfd_x86_elf_dtpoff_base (info
)
3219 htab
->elf
.sgot
->contents
+ off
+ 4);
3220 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3221 outrel
.r_offset
+= 4;
3222 elf_append_rel (output_bfd
, sreloc
, &outrel
);
3229 local_got_offsets
[r_symndx
] |= 1;
3232 if (off
>= (bfd_vma
) -2
3233 && ! GOT_TLS_GDESC_P (tls_type
))
3235 if (r_type_tls
== R_386_TLS_GOTDESC
3236 || r_type_tls
== R_386_TLS_DESC_CALL
)
3238 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
3239 unresolved_reloc
= FALSE
;
3241 else if (r_type_tls
== r_type
)
3243 bfd_vma g_o_t
= htab
->elf
.sgotplt
->output_section
->vma
3244 + htab
->elf
.sgotplt
->output_offset
;
3245 relocation
= htab
->elf
.sgot
->output_section
->vma
3246 + htab
->elf
.sgot
->output_offset
+ off
- g_o_t
;
3247 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
3248 && tls_type
== GOT_TLS_IE_BOTH
)
3250 if (r_type
== R_386_TLS_IE
)
3251 relocation
+= g_o_t
;
3252 unresolved_reloc
= FALSE
;
3254 else if (r_type
== R_386_TLS_GD
)
3256 unsigned int val
, type
;
3259 /* GD->IE transition. */
3260 type
= *(contents
+ rel
->r_offset
- 2);
3261 val
= *(contents
+ rel
->r_offset
- 1);
3265 leal foo@tlsgd(,%ebx,1), %eax
3266 call ___tls_get_addr@PLT
3269 subl $foo@gottpoff(%ebx), %eax. */
3271 roff
= rel
->r_offset
- 3;
3276 leal foo@tlsgd(%ebx), %eax
3277 call ___tls_get_addr@PLT
3280 leal foo@tlsgd(%reg), %eax
3281 call *___tls_get_addr@GOT(%reg)
3282 which may be converted to
3283 addr32 call ___tls_get_addr
3286 subl $foo@gottpoff(%reg), %eax. */
3287 roff
= rel
->r_offset
- 2;
3289 memcpy (contents
+ roff
,
3290 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3291 contents
[roff
+ 7] = 0x80 | (val
& 7);
3292 /* If foo is used only with foo@gotntpoff(%reg) and
3293 foo@indntpoff, but not with foo@gottpoff(%reg), change
3294 subl $foo@gottpoff(%reg), %eax
3296 addl $foo@gotntpoff(%reg), %eax. */
3297 if (tls_type
== GOT_TLS_IE_POS
)
3298 contents
[roff
+ 6] = 0x03;
3299 bfd_put_32 (output_bfd
,
3300 htab
->elf
.sgot
->output_section
->vma
3301 + htab
->elf
.sgot
->output_offset
+ off
3302 - htab
->elf
.sgotplt
->output_section
->vma
3303 - htab
->elf
.sgotplt
->output_offset
,
3304 contents
+ roff
+ 8);
3305 /* Skip R_386_PLT32 and R_386_GOT32X. */
3310 else if (r_type
== R_386_TLS_GOTDESC
)
3312 /* GDesc -> IE transition.
3313 It's originally something like:
3314 leal x@tlsdesc(%ebx), %eax
3317 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3319 movl x@gottpoff(%ebx), %eax # before negl %eax
3321 Registers other than %eax may be set up here. */
3325 /* First, make sure it's a leal adding ebx to a 32-bit
3326 offset into any register, although it's probably
3327 almost always going to be eax. */
3328 roff
= rel
->r_offset
;
3330 /* Now modify the instruction as appropriate. */
3331 /* To turn a leal into a movl in the form we use it, it
3332 suffices to change the first byte from 0x8d to 0x8b.
3333 aoliva FIXME: should we decide to keep the leal, all
3334 we have to do is remove the statement below, and
3335 adjust the relaxation of R_386_TLS_DESC_CALL. */
3336 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3338 if (tls_type
== GOT_TLS_IE_BOTH
)
3341 bfd_put_32 (output_bfd
,
3342 htab
->elf
.sgot
->output_section
->vma
3343 + htab
->elf
.sgot
->output_offset
+ off
3344 - htab
->elf
.sgotplt
->output_section
->vma
3345 - htab
->elf
.sgotplt
->output_offset
,
3349 else if (r_type
== R_386_TLS_DESC_CALL
)
3351 /* GDesc -> IE transition.
3359 depending on how we transformed the TLS_GOTDESC above.
3364 roff
= rel
->r_offset
;
3366 /* Now modify the instruction as appropriate. */
3367 if (tls_type
!= GOT_TLS_IE_NEG
)
3370 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3371 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3376 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
3377 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
3387 if (! elf_i386_tls_transition (info
, input_bfd
,
3388 input_section
, contents
,
3389 symtab_hdr
, sym_hashes
,
3390 &r_type
, GOT_UNKNOWN
, rel
,
3391 relend
, h
, r_symndx
, TRUE
))
3394 if (r_type
!= R_386_TLS_LDM
)
3396 /* LD->LE transition. Change
3397 leal foo@tlsldm(%ebx) %eax
3398 call ___tls_get_addr@PLT
3402 leal 0(%esi,1), %esi
3404 leal foo@tlsldm(%reg) %eax
3405 call *___tls_get_addr@GOT(%reg)
3406 which may be converted to
3407 addr32 call ___tls_get_addr
3410 leal 0(%esi), %esi */
3411 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
3412 if (*(contents
+ rel
->r_offset
+ 4) == 0xff
3413 || *(contents
+ rel
->r_offset
+ 4) == 0x67)
3414 memcpy (contents
+ rel
->r_offset
- 2,
3415 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3417 memcpy (contents
+ rel
->r_offset
- 2,
3418 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3419 /* Skip R_386_PC32/R_386_PLT32. */
3425 if (htab
->elf
.sgot
== NULL
)
3428 off
= htab
->tls_ld_or_ldm_got
.offset
;
3433 Elf_Internal_Rela outrel
;
3435 if (htab
->elf
.srelgot
== NULL
)
3438 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3439 + htab
->elf
.sgot
->output_offset
+ off
);
3441 bfd_put_32 (output_bfd
, 0,
3442 htab
->elf
.sgot
->contents
+ off
);
3443 bfd_put_32 (output_bfd
, 0,
3444 htab
->elf
.sgot
->contents
+ off
+ 4);
3445 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
3446 elf_append_rel (output_bfd
, htab
->elf
.srelgot
, &outrel
);
3447 htab
->tls_ld_or_ldm_got
.offset
|= 1;
3449 relocation
= htab
->elf
.sgot
->output_section
->vma
3450 + htab
->elf
.sgot
->output_offset
+ off
3451 - htab
->elf
.sgotplt
->output_section
->vma
3452 - htab
->elf
.sgotplt
->output_offset
;
3453 unresolved_reloc
= FALSE
;
3456 case R_386_TLS_LDO_32
:
3457 if (!bfd_link_executable (info
)
3458 || (input_section
->flags
& SEC_CODE
) == 0)
3459 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
3461 /* When converting LDO to LE, we must negate. */
3462 relocation
= -elf_i386_tpoff (info
, relocation
);
3465 case R_386_TLS_LE_32
:
3467 if (!bfd_link_executable (info
))
3469 Elf_Internal_Rela outrel
;
3472 outrel
.r_offset
= rel
->r_offset
3473 + input_section
->output_section
->vma
3474 + input_section
->output_offset
;
3475 if (h
!= NULL
&& h
->dynindx
!= -1)
3479 if (r_type
== R_386_TLS_LE_32
)
3480 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
3482 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3483 sreloc
= elf_section_data (input_section
)->sreloc
;
3486 elf_append_rel (output_bfd
, sreloc
, &outrel
);
3489 else if (r_type
== R_386_TLS_LE_32
)
3490 relocation
= _bfd_x86_elf_dtpoff_base (info
) - relocation
;
3492 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
3494 else if (r_type
== R_386_TLS_LE_32
)
3495 relocation
= elf_i386_tpoff (info
, relocation
);
3497 relocation
= -elf_i386_tpoff (info
, relocation
);
3504 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3505 because such sections are not SEC_ALLOC and thus ld.so will
3506 not process them. */
3507 if (unresolved_reloc
3508 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3510 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3511 rel
->r_offset
) != (bfd_vma
) -1)
3514 /* xgettext:c-format */
3515 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3520 h
->root
.root
.string
);
3525 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3526 contents
, rel
->r_offset
,
3529 check_relocation_error
:
3530 if (r
!= bfd_reloc_ok
)
3535 name
= h
->root
.root
.string
;
3538 name
= bfd_elf_string_from_elf_section (input_bfd
,
3539 symtab_hdr
->sh_link
,
3544 name
= bfd_section_name (input_bfd
, sec
);
3547 if (r
== bfd_reloc_overflow
)
3548 (*info
->callbacks
->reloc_overflow
)
3549 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3550 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
3554 /* xgettext:c-format */
3555 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3556 input_bfd
, input_section
,
3557 rel
->r_offset
, name
, (int) r
);
3568 Elf_Internal_Shdr
*rel_hdr
;
3569 size_t deleted
= rel
- wrel
;
3571 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
3572 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
3573 if (rel_hdr
->sh_size
== 0)
3575 /* It is too late to remove an empty reloc section. Leave
3577 ??? What is wrong with an empty section??? */
3578 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
3581 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
3582 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
3583 input_section
->reloc_count
-= deleted
;
3589 /* Finish up dynamic symbol handling. We set the contents of various
3590 dynamic sections here. */
3593 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
3594 struct bfd_link_info
*info
,
3595 struct elf_link_hash_entry
*h
,
3596 Elf_Internal_Sym
*sym
)
3598 struct elf_x86_link_hash_table
*htab
;
3599 unsigned plt_entry_size
;
3600 struct elf_x86_link_hash_entry
*eh
;
3601 bfd_boolean local_undefweak
;
3602 bfd_boolean use_plt_second
;
3604 htab
= elf_x86_hash_table (info
, I386_ELF_DATA
);
3608 plt_entry_size
= htab
->plt
.plt_entry_size
;
3610 /* Use the second PLT section only if there is .plt section. */
3611 use_plt_second
= htab
->elf
.splt
!= NULL
&& htab
->plt_second
!= NULL
;
3613 eh
= (struct elf_x86_link_hash_entry
*) h
;
3614 if (eh
->no_finish_dynamic_symbol
)
3617 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3618 resolved undefined weak symbols in executable so that their
3619 references have value 0 at run-time. */
3620 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, I386_ELF_DATA
,
3624 if (h
->plt
.offset
!= (bfd_vma
) -1)
3626 bfd_vma plt_index
, plt_offset
;
3628 Elf_Internal_Rela rel
;
3630 asection
*plt
, *resolved_plt
, *gotplt
, *relplt
;
3632 /* When building a static executable, use .iplt, .igot.plt and
3633 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3634 if (htab
->elf
.splt
!= NULL
)
3636 plt
= htab
->elf
.splt
;
3637 gotplt
= htab
->elf
.sgotplt
;
3638 relplt
= htab
->elf
.srelplt
;
3642 plt
= htab
->elf
.iplt
;
3643 gotplt
= htab
->elf
.igotplt
;
3644 relplt
= htab
->elf
.irelplt
;
3647 /* This symbol has an entry in the procedure linkage table. Set
3650 if ((h
->dynindx
== -1
3652 && !((h
->forced_local
|| bfd_link_executable (info
))
3654 && h
->type
== STT_GNU_IFUNC
))
3660 /* Get the index in the procedure linkage table which
3661 corresponds to this symbol. This is the index of this symbol
3662 in all the symbols for which we are making plt entries. The
3663 first entry in the procedure linkage table is reserved.
3665 Get the offset into the .got table of the entry that
3666 corresponds to this function. Each .got entry is 4 bytes.
3667 The first three are reserved.
3669 For static executables, we don't reserve anything. */
3671 if (plt
== htab
->elf
.splt
)
3673 got_offset
= (h
->plt
.offset
/ plt_entry_size
3674 - htab
->plt
.has_plt0
);
3675 got_offset
= (got_offset
+ 3) * 4;
3679 got_offset
= h
->plt
.offset
/ plt_entry_size
;
3680 got_offset
= got_offset
* 4;
3683 /* Fill in the entry in the procedure linkage table and update
3685 memcpy (plt
->contents
+ h
->plt
.offset
, htab
->plt
.plt_entry
,
3690 const bfd_byte
*plt_entry
;
3691 if (bfd_link_pic (info
))
3692 plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
3694 plt_entry
= htab
->non_lazy_plt
->plt_entry
;
3695 memcpy (htab
->plt_second
->contents
+ eh
->plt_second
.offset
,
3696 plt_entry
, htab
->non_lazy_plt
->plt_entry_size
);
3698 resolved_plt
= htab
->plt_second
;
3699 plt_offset
= eh
->plt_second
.offset
;
3704 plt_offset
= h
->plt
.offset
;
3707 if (! bfd_link_pic (info
))
3709 bfd_put_32 (output_bfd
,
3710 (gotplt
->output_section
->vma
3711 + gotplt
->output_offset
3713 resolved_plt
->contents
+ plt_offset
3714 + htab
->plt
.plt_got_offset
);
3716 if (htab
->is_vxworks
)
3718 int s
, k
, reloc_index
;
3720 /* Create the R_386_32 relocation referencing the GOT
3721 for this PLT entry. */
3723 /* S: Current slot number (zero-based). */
3724 s
= ((h
->plt
.offset
- htab
->plt
.plt_entry_size
)
3725 / htab
->plt
.plt_entry_size
);
3726 /* K: Number of relocations for PLTResolve. */
3727 if (bfd_link_pic (info
))
3728 k
= PLTRESOLVE_RELOCS_SHLIB
;
3730 k
= PLTRESOLVE_RELOCS
;
3731 /* Skip the PLTresolve relocations, and the relocations for
3732 the other PLT slots. */
3733 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
3734 loc
= (htab
->srelplt2
->contents
+ reloc_index
3735 * sizeof (Elf32_External_Rel
));
3737 rel
.r_offset
= (plt
->output_section
->vma
3738 + plt
->output_offset
3739 + h
->plt
.offset
+ 2),
3740 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
3741 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3743 /* Create the R_386_32 relocation referencing the beginning of
3744 the PLT for this GOT entry. */
3745 rel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3746 + htab
->elf
.sgotplt
->output_offset
3748 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
3749 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3750 loc
+ sizeof (Elf32_External_Rel
));
3755 bfd_put_32 (output_bfd
, got_offset
,
3756 resolved_plt
->contents
+ plt_offset
3757 + htab
->plt
.plt_got_offset
);
3760 /* Fill in the entry in the global offset table. Leave the entry
3761 as zero for undefined weak symbol in PIE. No PLT relocation
3762 against undefined weak symbol in PIE. */
3763 if (!local_undefweak
)
3765 if (htab
->plt
.has_plt0
)
3766 bfd_put_32 (output_bfd
,
3767 (plt
->output_section
->vma
3768 + plt
->output_offset
3770 + htab
->lazy_plt
->plt_lazy_offset
),
3771 gotplt
->contents
+ got_offset
);
3773 /* Fill in the entry in the .rel.plt section. */
3774 rel
.r_offset
= (gotplt
->output_section
->vma
3775 + gotplt
->output_offset
3777 if (h
->dynindx
== -1
3778 || ((bfd_link_executable (info
)
3779 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3781 && h
->type
== STT_GNU_IFUNC
))
3783 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
3784 h
->root
.root
.string
,
3785 h
->root
.u
.def
.section
->owner
);
3787 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3788 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3789 in the .got.plt section. */
3790 bfd_put_32 (output_bfd
,
3791 (h
->root
.u
.def
.value
3792 + h
->root
.u
.def
.section
->output_section
->vma
3793 + h
->root
.u
.def
.section
->output_offset
),
3794 gotplt
->contents
+ got_offset
);
3795 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
3796 /* R_386_IRELATIVE comes last. */
3797 plt_index
= htab
->next_irelative_index
--;
3801 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
3802 plt_index
= htab
->next_jump_slot_index
++;
3805 loc
= relplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3806 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3808 /* Don't fill the second and third slots in PLT entry for
3809 static executables nor without PLT0. */
3810 if (plt
== htab
->elf
.splt
&& htab
->plt
.has_plt0
)
3812 bfd_put_32 (output_bfd
,
3813 plt_index
* sizeof (Elf32_External_Rel
),
3814 plt
->contents
+ h
->plt
.offset
3815 + htab
->lazy_plt
->plt_reloc_offset
);
3816 bfd_put_32 (output_bfd
,
3818 + htab
->lazy_plt
->plt_plt_offset
+ 4),
3819 (plt
->contents
+ h
->plt
.offset
3820 + htab
->lazy_plt
->plt_plt_offset
));
3824 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
3826 bfd_vma got_offset
, plt_offset
;
3827 asection
*plt
, *got
, *gotplt
;
3828 const bfd_byte
*got_plt_entry
;
3830 /* Set the entry in the GOT procedure linkage table. */
3831 plt
= htab
->plt_got
;
3832 got
= htab
->elf
.sgot
;
3833 gotplt
= htab
->elf
.sgotplt
;
3834 got_offset
= h
->got
.offset
;
3836 if (got_offset
== (bfd_vma
) -1
3842 /* Fill in the entry in the GOT procedure linkage table. */
3843 if (! bfd_link_pic (info
))
3845 got_plt_entry
= htab
->non_lazy_plt
->plt_entry
;
3846 got_offset
+= got
->output_section
->vma
+ got
->output_offset
;
3850 got_plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
3851 got_offset
+= (got
->output_section
->vma
3852 + got
->output_offset
3853 - gotplt
->output_section
->vma
3854 - gotplt
->output_offset
);
3857 plt_offset
= eh
->plt_got
.offset
;
3858 memcpy (plt
->contents
+ plt_offset
, got_plt_entry
,
3859 htab
->non_lazy_plt
->plt_entry_size
);
3860 bfd_put_32 (output_bfd
, got_offset
,
3861 (plt
->contents
+ plt_offset
3862 + htab
->non_lazy_plt
->plt_got_offset
));
3865 if (!local_undefweak
3867 && (h
->plt
.offset
!= (bfd_vma
) -1
3868 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
3870 /* Mark the symbol as undefined, rather than as defined in
3871 the .plt section. Leave the value if there were any
3872 relocations where pointer equality matters (this is a clue
3873 for the dynamic linker, to make function pointer
3874 comparisons work between an application and shared
3875 library), otherwise set it to zero. If a function is only
3876 called from a binary, there is no need to slow down
3877 shared libraries because of that. */
3878 sym
->st_shndx
= SHN_UNDEF
;
3879 if (!h
->pointer_equality_needed
)
3883 /* Don't generate dynamic GOT relocation against undefined weak
3884 symbol in executable. */
3885 if (h
->got
.offset
!= (bfd_vma
) -1
3886 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h
)->tls_type
)
3887 && (elf_x86_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0
3888 && !local_undefweak
)
3890 Elf_Internal_Rela rel
;
3891 asection
*relgot
= htab
->elf
.srelgot
;
3893 /* This symbol has an entry in the global offset table. Set it
3896 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
3899 rel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3900 + htab
->elf
.sgot
->output_offset
3901 + (h
->got
.offset
& ~(bfd_vma
) 1));
3903 /* If this is a static link, or it is a -Bsymbolic link and the
3904 symbol is defined locally or was forced to be local because
3905 of a version file, we just want to emit a RELATIVE reloc.
3906 The entry in the global offset table will already have been
3907 initialized in the relocate_section function. */
3909 && h
->type
== STT_GNU_IFUNC
)
3911 if (h
->plt
.offset
== (bfd_vma
) -1)
3913 /* STT_GNU_IFUNC is referenced without PLT. */
3914 if (htab
->elf
.splt
== NULL
)
3916 /* use .rel[a].iplt section to store .got relocations
3917 in static executable. */
3918 relgot
= htab
->elf
.irelplt
;
3920 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
3922 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %B\n"),
3923 h
->root
.root
.string
,
3924 h
->root
.u
.def
.section
->owner
);
3926 bfd_put_32 (output_bfd
,
3927 (h
->root
.u
.def
.value
3928 + h
->root
.u
.def
.section
->output_section
->vma
3929 + h
->root
.u
.def
.section
->output_offset
),
3930 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3931 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
3936 else if (bfd_link_pic (info
))
3938 /* Generate R_386_GLOB_DAT. */
3946 if (!h
->pointer_equality_needed
)
3949 /* For non-shared object, we can't use .got.plt, which
3950 contains the real function addres if we need pointer
3951 equality. We load the GOT entry with the PLT entry. */
3952 if (htab
->plt_second
!= NULL
)
3954 plt
= htab
->plt_second
;
3955 plt_offset
= eh
->plt_second
.offset
;
3959 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3960 plt_offset
= h
->plt
.offset
;
3962 bfd_put_32 (output_bfd
,
3963 (plt
->output_section
->vma
3964 + plt
->output_offset
+ plt_offset
),
3965 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3969 else if (bfd_link_pic (info
)
3970 && SYMBOL_REFERENCES_LOCAL_P (info
, h
))
3972 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3973 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3977 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3979 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
3980 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3981 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
3984 elf_append_rel (output_bfd
, relgot
, &rel
);
3989 Elf_Internal_Rela rel
;
3992 /* This symbol needs a copy reloc. Set it up. */
3994 if (h
->dynindx
== -1
3995 || (h
->root
.type
!= bfd_link_hash_defined
3996 && h
->root
.type
!= bfd_link_hash_defweak
)
3997 || htab
->elf
.srelbss
== NULL
3998 || htab
->elf
.sreldynrelro
== NULL
)
4001 rel
.r_offset
= (h
->root
.u
.def
.value
4002 + h
->root
.u
.def
.section
->output_section
->vma
4003 + h
->root
.u
.def
.section
->output_offset
);
4004 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
4005 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
4006 s
= htab
->elf
.sreldynrelro
;
4008 s
= htab
->elf
.srelbss
;
4009 elf_append_rel (output_bfd
, s
, &rel
);
4015 /* Finish up local dynamic symbol handling. We set the contents of
4016 various dynamic sections here. */
4019 elf_i386_finish_local_dynamic_symbol (void **slot
, void *inf
)
4021 struct elf_link_hash_entry
*h
4022 = (struct elf_link_hash_entry
*) *slot
;
4023 struct bfd_link_info
*info
4024 = (struct bfd_link_info
*) inf
;
4026 return elf_i386_finish_dynamic_symbol (info
->output_bfd
, info
,
4030 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4031 here since undefined weak symbol may not be dynamic and may not be
4032 called for elf_i386_finish_dynamic_symbol. */
4035 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
4038 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
4039 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
4041 if (h
->root
.type
!= bfd_link_hash_undefweak
4042 || h
->dynindx
!= -1)
4045 return elf_i386_finish_dynamic_symbol (info
->output_bfd
,
4049 /* Used to decide how to sort relocs in an optimal manner for the
4050 dynamic linker, before writing them out. */
4052 static enum elf_reloc_type_class
4053 elf_i386_reloc_type_class (const struct bfd_link_info
*info
,
4054 const asection
*rel_sec ATTRIBUTE_UNUSED
,
4055 const Elf_Internal_Rela
*rela
)
4057 bfd
*abfd
= info
->output_bfd
;
4058 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4059 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
4061 if (htab
->dynsym
!= NULL
4062 && htab
->dynsym
->contents
!= NULL
)
4064 /* Check relocation against STT_GNU_IFUNC symbol if there are
4066 unsigned long r_symndx
= ELF32_R_SYM (rela
->r_info
);
4067 if (r_symndx
!= STN_UNDEF
)
4069 Elf_Internal_Sym sym
;
4070 if (!bed
->s
->swap_symbol_in (abfd
,
4071 (htab
->dynsym
->contents
4072 + r_symndx
* sizeof (Elf32_External_Sym
)),
4076 if (ELF32_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
4077 return reloc_class_ifunc
;
4081 switch (ELF32_R_TYPE (rela
->r_info
))
4083 case R_386_IRELATIVE
:
4084 return reloc_class_ifunc
;
4085 case R_386_RELATIVE
:
4086 return reloc_class_relative
;
4087 case R_386_JUMP_SLOT
:
4088 return reloc_class_plt
;
4090 return reloc_class_copy
;
4092 return reloc_class_normal
;
4096 /* Finish up the dynamic sections. */
4099 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
4100 struct bfd_link_info
*info
)
4102 struct elf_x86_link_hash_table
*htab
;
4105 const struct elf_i386_backend_data
*abed
;
4107 htab
= elf_x86_hash_table (info
, I386_ELF_DATA
);
4111 dynobj
= htab
->elf
.dynobj
;
4112 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
4113 abed
= get_elf_i386_backend_data (output_bfd
);
4115 if (htab
->elf
.dynamic_sections_created
)
4117 Elf32_External_Dyn
*dyncon
, *dynconend
;
4119 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4122 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
4123 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4124 for (; dyncon
< dynconend
; dyncon
++)
4126 Elf_Internal_Dyn dyn
;
4129 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4134 if (htab
->is_vxworks
4135 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
4140 s
= htab
->elf
.sgotplt
;
4141 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4145 s
= htab
->elf
.srelplt
;
4146 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4150 s
= htab
->elf
.srelplt
;
4151 dyn
.d_un
.d_val
= s
->size
;
4155 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4158 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4160 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4161 really seem like the right value. */
4162 elf_section_data (htab
->elf
.splt
->output_section
)
4163 ->this_hdr
.sh_entsize
= 4;
4165 if (htab
->plt
.has_plt0
)
4167 /* Fill in the special first entry in the procedure linkage
4169 memcpy (htab
->elf
.splt
->contents
, htab
->plt
.plt0_entry
,
4170 htab
->lazy_plt
->plt0_entry_size
);
4171 memset (htab
->elf
.splt
->contents
+ htab
->lazy_plt
->plt0_entry_size
,
4172 abed
->plt0_pad_byte
,
4173 htab
->plt
.plt_entry_size
- htab
->lazy_plt
->plt0_entry_size
);
4174 if (!bfd_link_pic (info
))
4176 bfd_put_32 (output_bfd
,
4177 (htab
->elf
.sgotplt
->output_section
->vma
4178 + htab
->elf
.sgotplt
->output_offset
4180 htab
->elf
.splt
->contents
4181 + htab
->lazy_plt
->plt0_got1_offset
);
4182 bfd_put_32 (output_bfd
,
4183 (htab
->elf
.sgotplt
->output_section
->vma
4184 + htab
->elf
.sgotplt
->output_offset
4186 htab
->elf
.splt
->contents
4187 + htab
->lazy_plt
->plt0_got2_offset
);
4189 if (htab
->is_vxworks
)
4191 Elf_Internal_Rela rel
;
4192 int num_plts
= (htab
->elf
.splt
->size
4193 / htab
->plt
.plt_entry_size
) - 1;
4195 asection
*srelplt2
= htab
->srelplt2
;
4197 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4198 + 4. On IA32 we use REL relocations so the
4199 addend goes in the PLT directly. */
4200 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
4201 + htab
->elf
.splt
->output_offset
4202 + htab
->lazy_plt
->plt0_got1_offset
);
4203 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
4205 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4206 srelplt2
->contents
);
4207 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4209 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
4210 + htab
->elf
.splt
->output_offset
4211 + htab
->lazy_plt
->plt0_got2_offset
);
4212 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
4214 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4215 srelplt2
->contents
+
4216 sizeof (Elf32_External_Rel
));
4217 /* Correct the .rel.plt.unloaded relocations. */
4218 p
= srelplt2
->contents
;
4219 if (bfd_link_pic (info
))
4220 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
4222 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
4224 for (; num_plts
; num_plts
--)
4226 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4227 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
,
4229 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4230 p
+= sizeof (Elf32_External_Rel
);
4232 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4233 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
,
4235 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4236 p
+= sizeof (Elf32_External_Rel
);
4243 if (htab
->plt_got
!= NULL
&& htab
->plt_got
->size
> 0)
4244 elf_section_data (htab
->plt_got
->output_section
)
4245 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
4247 if (htab
->plt_second
!= NULL
&& htab
->plt_second
->size
> 0)
4248 elf_section_data (htab
->plt_second
->output_section
)
4249 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
4252 /* Fill in the first three entries in the global offset table. */
4253 if (htab
->elf
.sgotplt
&& htab
->elf
.sgotplt
->size
> 0)
4255 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4258 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4262 bfd_put_32 (output_bfd
,
4264 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
4265 htab
->elf
.sgotplt
->contents
);
4266 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 4);
4267 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 8);
4269 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
4272 /* Adjust .eh_frame for .plt section. */
4273 if (htab
->plt_eh_frame
!= NULL
4274 && htab
->plt_eh_frame
->contents
!= NULL
)
4276 if (htab
->elf
.splt
!= NULL
4277 && htab
->elf
.splt
->size
!= 0
4278 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
4279 && htab
->elf
.splt
->output_section
!= NULL
4280 && htab
->plt_eh_frame
->output_section
!= NULL
)
4282 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
4283 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
4284 + htab
->plt_eh_frame
->output_offset
4285 + PLT_FDE_START_OFFSET
;
4286 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4287 htab
->plt_eh_frame
->contents
4288 + PLT_FDE_START_OFFSET
);
4290 if (htab
->plt_eh_frame
->sec_info_type
4291 == SEC_INFO_TYPE_EH_FRAME
)
4293 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4295 htab
->plt_eh_frame
->contents
))
4300 /* Adjust .eh_frame for .plt.got section. */
4301 if (htab
->plt_got_eh_frame
!= NULL
4302 && htab
->plt_got_eh_frame
->contents
!= NULL
)
4304 if (htab
->plt_got
!= NULL
4305 && htab
->plt_got
->size
!= 0
4306 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
4307 && htab
->plt_got
->output_section
!= NULL
4308 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
4310 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
4311 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
4312 + htab
->plt_got_eh_frame
->output_offset
4313 + PLT_FDE_START_OFFSET
;
4314 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4315 htab
->plt_got_eh_frame
->contents
4316 + PLT_FDE_START_OFFSET
);
4318 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
4320 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4321 htab
->plt_got_eh_frame
,
4322 htab
->plt_got_eh_frame
->contents
))
4327 /* Adjust .eh_frame for the second PLT section. */
4328 if (htab
->plt_second_eh_frame
!= NULL
4329 && htab
->plt_second_eh_frame
->contents
!= NULL
)
4331 if (htab
->plt_second
!= NULL
4332 && htab
->plt_second
->size
!= 0
4333 && (htab
->plt_second
->flags
& SEC_EXCLUDE
) == 0
4334 && htab
->plt_second
->output_section
!= NULL
4335 && htab
->plt_second_eh_frame
->output_section
!= NULL
)
4337 bfd_vma plt_start
= htab
->plt_second
->output_section
->vma
;
4338 bfd_vma eh_frame_start
4339 = (htab
->plt_second_eh_frame
->output_section
->vma
4340 + htab
->plt_second_eh_frame
->output_offset
4341 + PLT_FDE_START_OFFSET
);
4342 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4343 htab
->plt_second_eh_frame
->contents
4344 + PLT_FDE_START_OFFSET
);
4346 if (htab
->plt_second_eh_frame
->sec_info_type
4347 == SEC_INFO_TYPE_EH_FRAME
)
4349 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4350 htab
->plt_second_eh_frame
,
4351 htab
->plt_second_eh_frame
->contents
))
4356 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4357 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4359 /* Fill PLT entries for undefined weak symbols in PIE. */
4360 if (bfd_link_pie (info
))
4361 bfd_hash_traverse (&info
->hash
->table
,
4362 elf_i386_pie_finish_undefweak_symbol
,
4368 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4369 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4370 It has to be done before elf_link_sort_relocs is called so that
4371 dynamic relocations are properly sorted. */
4374 elf_i386_output_arch_local_syms
4375 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
4376 struct bfd_link_info
*info
,
4377 void *flaginfo ATTRIBUTE_UNUSED
,
4378 int (*func
) (void *, const char *,
4381 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
4383 struct elf_x86_link_hash_table
*htab
4384 = elf_x86_hash_table (info
, I386_ELF_DATA
);
4388 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4389 htab_traverse (htab
->loc_hash_table
,
4390 elf_i386_finish_local_dynamic_symbol
,
4396 /* Forward declaration. */
4397 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt
;
4399 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4400 dynamic relocations. */
4403 elf_i386_get_synthetic_symtab (bfd
*abfd
,
4404 long symcount ATTRIBUTE_UNUSED
,
4405 asymbol
**syms ATTRIBUTE_UNUSED
,
4412 bfd_byte
*plt_contents
;
4414 const struct elf_x86_lazy_plt_layout
*lazy_plt
;
4415 const struct elf_x86_non_lazy_plt_layout
*non_lazy_plt
;
4416 const struct elf_x86_lazy_plt_layout
*lazy_ibt_plt
;
4417 const struct elf_x86_non_lazy_plt_layout
*non_lazy_ibt_plt
;
4420 enum elf_x86_plt_type plt_type
;
4421 struct elf_x86_plt plts
[] =
4423 { ".plt", NULL
, NULL
, plt_unknown
, 0, 0, 0, 0 },
4424 { ".plt.got", NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 },
4425 { ".plt.sec", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4426 { NULL
, NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 }
4431 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
4434 if (dynsymcount
<= 0)
4437 relsize
= bfd_get_dynamic_reloc_upper_bound (abfd
);
4441 non_lazy_plt
= NULL
;
4442 /* Silence GCC 6. */
4444 non_lazy_ibt_plt
= NULL
;
4445 lazy_ibt_plt
= NULL
;
4446 switch (get_elf_i386_backend_data (abfd
)->os
)
4449 non_lazy_plt
= &elf_i386_non_lazy_plt
;
4450 lazy_ibt_plt
= &elf_i386_lazy_ibt_plt
;
4451 non_lazy_ibt_plt
= &elf_i386_non_lazy_ibt_plt
;
4454 lazy_plt
= &elf_i386_lazy_plt
;
4457 lazy_plt
= &elf_i386_nacl_plt
;
4464 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
4466 plt
= bfd_get_section_by_name (abfd
, plts
[j
].name
);
4467 if (plt
== NULL
|| plt
->size
== 0)
4470 /* Get the PLT section contents. */
4471 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
4472 if (plt_contents
== NULL
)
4474 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
4475 plt_contents
, 0, plt
->size
))
4477 free (plt_contents
);
4481 /* Check what kind of PLT it is. */
4482 plt_type
= plt_unknown
;
4483 if (plts
[j
].type
== plt_unknown
4484 && (plt
->size
>= (lazy_plt
->plt0_entry_size
4485 + lazy_plt
->plt_entry_size
)))
4487 /* Match lazy PLT first. */
4488 if (memcmp (plt_contents
, lazy_plt
->plt0_entry
,
4489 lazy_plt
->plt0_got1_offset
) == 0)
4491 /* The fist entry in the lazy IBT PLT is the same as the
4493 if (lazy_ibt_plt
!= NULL
4494 && (memcmp (plt_contents
+ lazy_ibt_plt
->plt0_entry_size
,
4495 lazy_ibt_plt
->plt_entry
,
4496 lazy_ibt_plt
->plt_got_offset
) == 0))
4497 plt_type
= plt_lazy
| plt_second
;
4499 plt_type
= plt_lazy
;
4501 else if (memcmp (plt_contents
, lazy_plt
->pic_plt0_entry
,
4502 lazy_plt
->plt0_got1_offset
) == 0)
4504 /* The fist entry in the PIC lazy IBT PLT is the same as
4505 the normal PIC lazy PLT. */
4506 if (lazy_ibt_plt
!= NULL
4507 && (memcmp (plt_contents
+ lazy_ibt_plt
->plt0_entry_size
,
4508 lazy_ibt_plt
->pic_plt_entry
,
4509 lazy_ibt_plt
->plt_got_offset
) == 0))
4510 plt_type
= plt_lazy
| plt_pic
| plt_second
;
4512 plt_type
= plt_lazy
| plt_pic
;
4516 if (non_lazy_plt
!= NULL
4517 && (plt_type
== plt_unknown
|| plt_type
== plt_non_lazy
)
4518 && plt
->size
>= non_lazy_plt
->plt_entry_size
)
4520 /* Match non-lazy PLT. */
4521 if (memcmp (plt_contents
, non_lazy_plt
->plt_entry
,
4522 non_lazy_plt
->plt_got_offset
) == 0)
4523 plt_type
= plt_non_lazy
;
4524 else if (memcmp (plt_contents
, non_lazy_plt
->pic_plt_entry
,
4525 non_lazy_plt
->plt_got_offset
) == 0)
4529 if ((non_lazy_ibt_plt
!= NULL
)
4530 && (plt_type
== plt_unknown
|| plt_type
== plt_second
)
4531 && plt
->size
>= non_lazy_ibt_plt
->plt_entry_size
)
4533 if (memcmp (plt_contents
,
4534 non_lazy_ibt_plt
->plt_entry
,
4535 non_lazy_ibt_plt
->plt_got_offset
) == 0)
4537 /* Match IBT PLT. */
4538 plt_type
= plt_second
;
4539 non_lazy_plt
= non_lazy_ibt_plt
;
4541 else if (memcmp (plt_contents
,
4542 non_lazy_ibt_plt
->pic_plt_entry
,
4543 non_lazy_ibt_plt
->plt_got_offset
) == 0)
4545 /* Match PIC IBT PLT. */
4546 plt_type
= plt_second
| plt_pic
;
4547 non_lazy_plt
= non_lazy_ibt_plt
;
4551 if (plt_type
== plt_unknown
)
4553 free (plt_contents
);
4558 plts
[j
].type
= plt_type
;
4560 if ((plt_type
& plt_lazy
))
4562 plts
[j
].plt_got_offset
= lazy_plt
->plt_got_offset
;
4563 plts
[j
].plt_entry_size
= lazy_plt
->plt_entry_size
;
4564 /* Skip PLT0 in lazy PLT. */
4569 plts
[j
].plt_got_offset
= non_lazy_plt
->plt_got_offset
;
4570 plts
[j
].plt_entry_size
= non_lazy_plt
->plt_entry_size
;
4574 /* Skip lazy PLT when the second PLT is used. */
4575 if ((plt_type
& (plt_lazy
| plt_second
))
4576 == (plt_lazy
| plt_second
))
4580 n
= plt
->size
/ plts
[j
].plt_entry_size
;
4585 plts
[j
].contents
= plt_contents
;
4587 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4588 if ((plt_type
& plt_pic
))
4589 got_addr
= (bfd_vma
) -1;
4592 return _bfd_x86_elf_get_synthetic_symtab (abfd
, count
, relsize
,
4593 got_addr
, plts
, dynsyms
,
4597 /* Set up i386 GNU properties. Return the first relocatable ELF input
4598 with GNU properties if found. Otherwise, return NULL. */
4601 elf_i386_link_setup_gnu_properties (struct bfd_link_info
*info
)
4603 struct elf_x86_plt_layout_table plt_layout
;
4605 plt_layout
.normal_target
= FALSE
;
4606 plt_layout
.is_vxworks
= FALSE
;
4607 switch (get_elf_i386_backend_data (info
->output_bfd
)->os
)
4610 plt_layout
.lazy_plt
= &elf_i386_lazy_plt
;
4611 plt_layout
.non_lazy_plt
= &elf_i386_non_lazy_plt
;
4612 plt_layout
.lazy_ibt_plt
= &elf_i386_lazy_ibt_plt
;
4613 plt_layout
.non_lazy_ibt_plt
= &elf_i386_non_lazy_ibt_plt
;
4614 plt_layout
.normal_target
= TRUE
;
4617 plt_layout
.lazy_plt
= &elf_i386_lazy_plt
;
4618 plt_layout
.non_lazy_plt
= NULL
;
4619 plt_layout
.lazy_ibt_plt
= NULL
;
4620 plt_layout
.non_lazy_ibt_plt
= NULL
;
4621 plt_layout
.is_vxworks
= TRUE
;
4624 plt_layout
.lazy_plt
= &elf_i386_nacl_plt
;
4625 plt_layout
.non_lazy_plt
= NULL
;
4626 plt_layout
.lazy_ibt_plt
= NULL
;
4627 plt_layout
.non_lazy_ibt_plt
= NULL
;
4631 return _bfd_x86_elf_link_setup_gnu_properties (info
, &plt_layout
);
4634 #define TARGET_LITTLE_SYM i386_elf32_vec
4635 #define TARGET_LITTLE_NAME "elf32-i386"
4636 #define ELF_ARCH bfd_arch_i386
4637 #define ELF_TARGET_ID I386_ELF_DATA
4638 #define ELF_MACHINE_CODE EM_386
4639 #define ELF_MAXPAGESIZE 0x1000
4641 #define elf_backend_can_gc_sections 1
4642 #define elf_backend_can_refcount 1
4643 #define elf_backend_want_got_plt 1
4644 #define elf_backend_plt_readonly 1
4645 #define elf_backend_want_plt_sym 0
4646 #define elf_backend_got_header_size 12
4647 #define elf_backend_plt_alignment 4
4648 #define elf_backend_dtrel_excludes_plt 1
4649 #define elf_backend_extern_protected_data 1
4650 #define elf_backend_caches_rawsize 1
4651 #define elf_backend_want_dynrelro 1
4653 /* Support RELA for objdump of prelink objects. */
4654 #define elf_info_to_howto elf_i386_info_to_howto_rel
4655 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4657 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4658 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4659 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4660 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4662 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4663 #define elf_backend_check_relocs elf_i386_check_relocs
4664 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4665 #define elf_backend_fake_sections elf_i386_fake_sections
4666 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4667 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4668 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4669 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4670 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4671 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4672 #define elf_backend_relocate_section elf_i386_relocate_section
4673 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4675 #include "elf32-target.h"
4677 /* FreeBSD support. */
4679 #undef TARGET_LITTLE_SYM
4680 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4681 #undef TARGET_LITTLE_NAME
4682 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4684 #define ELF_OSABI ELFOSABI_FREEBSD
4686 /* The kernel recognizes executables as valid only if they carry a
4687 "FreeBSD" label in the ELF header. So we put this label on all
4688 executables and (for simplicity) also all other object files. */
4691 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
4693 _bfd_elf_post_process_headers (abfd
, info
);
4695 #ifdef OLD_FREEBSD_ABI_LABEL
4697 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4698 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
4699 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
4704 #undef elf_backend_post_process_headers
4705 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4707 #define elf32_bed elf32_i386_fbsd_bed
4709 #undef elf_backend_add_symbol_hook
4711 #include "elf32-target.h"
4715 #undef TARGET_LITTLE_SYM
4716 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4717 #undef TARGET_LITTLE_NAME
4718 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4720 #undef elf_backend_post_process_headers
4722 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4723 objects won't be recognized. */
4727 #define elf32_bed elf32_i386_sol2_bed
4729 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4731 #undef elf_backend_static_tls_alignment
4732 #define elf_backend_static_tls_alignment 8
4734 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4736 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4738 #undef elf_backend_want_plt_sym
4739 #define elf_backend_want_plt_sym 1
4741 #undef elf_backend_strtab_flags
4742 #define elf_backend_strtab_flags SHF_STRINGS
4744 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4745 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4746 FALSE otherwise. ISECTION is the best guess matching section from the
4747 input bfd IBFD, but it might be NULL. */
4750 elf32_i386_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
4751 bfd
*obfd ATTRIBUTE_UNUSED
,
4752 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
4753 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
4755 /* PR 19938: FIXME: Need to add code for setting the sh_info
4756 and sh_link fields of Solaris specific section types. */
4759 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4760 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4762 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4764 The following values should be set:
4767 -----------------------------------------------------------------------------
4768 SHT_SUNW_ancillary The section header index of 0
4769 [0x6fffffee] the associated string table.
4771 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4772 [0x6ffffff0] the associated symbol table. section header index of
4774 SHT_SUNW_capchain table,
4777 SHT_SUNW_symsort The section header index of 0
4778 [0x6ffffff1] the associated symbol table.
4780 SHT_SUNW_tlssort The section header index of 0
4781 [0x6ffffff2] the associated symbol table.
4783 SHT_SUNW_LDYNSYM The section header index of One greater than the
4784 [0x6ffffff3] the associated string table. symbol table index of the
4785 This index is the same string last local symbol,
4786 table used by the SHT_DYNSYM STB_LOCAL. Since
4787 section. SHT_SUNW_LDYNSYM only
4788 contains local symbols,
4789 sh_info is equivalent to
4790 the number of symbols in
4793 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4794 [0x6ffffff5] the section header index of to named strings, the
4795 the associated section header index of
4796 SHT_SUNW_capinfo table, the associated string
4797 otherwise 0. table, otherwise 0.
4799 SHT_SUNW_move The section header index of 0
4800 [0x6ffffffa] the associated symbol table.
4805 SHT_SUNW_syminfo The section header index of The section header index
4806 [0x6ffffffc] the associated symbol table. of the associated
4809 SHT_SUNW_verdef The section header index of The number of version
4810 [0x6ffffffd] the associated string table. definitions within the
4813 SHT_SUNW_verneed The section header index of The number of version
4814 [0x6ffffffe] the associated string table. dependencies within the
4817 SHT_SUNW_versym The section header index of 0
4818 [0x6fffffff] the associated symbol table. */
4821 #undef elf_backend_copy_special_section_fields
4822 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4824 #include "elf32-target.h"
4826 /* Intel MCU support. */
4829 elf32_iamcu_elf_object_p (bfd
*abfd
)
4831 /* Set the right machine number for an IAMCU elf32 file. */
4832 bfd_default_set_arch_mach (abfd
, bfd_arch_iamcu
, bfd_mach_i386_iamcu
);
4836 #undef TARGET_LITTLE_SYM
4837 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4838 #undef TARGET_LITTLE_NAME
4839 #define TARGET_LITTLE_NAME "elf32-iamcu"
4841 #define ELF_ARCH bfd_arch_iamcu
4843 #undef ELF_MACHINE_CODE
4844 #define ELF_MACHINE_CODE EM_IAMCU
4849 #define elf32_bed elf32_iamcu_bed
4851 #undef elf_backend_object_p
4852 #define elf_backend_object_p elf32_iamcu_elf_object_p
4854 #undef elf_backend_static_tls_alignment
4856 #undef elf_backend_want_plt_sym
4857 #define elf_backend_want_plt_sym 0
4859 #undef elf_backend_strtab_flags
4860 #undef elf_backend_copy_special_section_fields
4862 #include "elf32-target.h"
4864 /* Restore defaults. */
4866 #define ELF_ARCH bfd_arch_i386
4867 #undef ELF_MACHINE_CODE
4868 #define ELF_MACHINE_CODE EM_386
4870 /* Native Client support. */
4872 #undef TARGET_LITTLE_SYM
4873 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4874 #undef TARGET_LITTLE_NAME
4875 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4877 #define elf32_bed elf32_i386_nacl_bed
4879 #undef ELF_MAXPAGESIZE
4880 #define ELF_MAXPAGESIZE 0x10000
4882 /* Restore defaults. */
4884 #undef elf_backend_want_plt_sym
4885 #define elf_backend_want_plt_sym 0
4886 #undef elf_backend_post_process_headers
4887 #undef elf_backend_static_tls_alignment
4889 /* NaCl uses substantially different PLT entries for the same effects. */
4891 #undef elf_backend_plt_alignment
4892 #define elf_backend_plt_alignment 5
4893 #define NACL_PLT_ENTRY_SIZE 64
4894 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4896 static const bfd_byte elf_i386_nacl_plt0_entry
[] =
4898 0xff, 0x35, /* pushl contents of address */
4899 0, 0, 0, 0, /* replaced with address of .got + 4. */
4900 0x8b, 0x0d, /* movl contents of address, %ecx */
4901 0, 0, 0, 0, /* replaced with address of .got + 8. */
4902 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
4903 0xff, 0xe1 /* jmp *%ecx */
4906 static const bfd_byte elf_i386_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
4908 0x8b, 0x0d, /* movl contents of address, %ecx */
4909 0, 0, 0, 0, /* replaced with GOT slot address. */
4910 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
4911 0xff, 0xe1, /* jmp *%ecx */
4913 /* Pad to the next 32-byte boundary with nop instructions. */
4915 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4916 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4918 /* Lazy GOT entries point here (32-byte aligned). */
4919 0x68, /* pushl immediate */
4920 0, 0, 0, 0, /* replaced with reloc offset. */
4921 0xe9, /* jmp relative */
4922 0, 0, 0, 0, /* replaced with offset to .plt. */
4924 /* Pad to the next 32-byte boundary with nop instructions. */
4925 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4926 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4930 static const bfd_byte
4931 elf_i386_nacl_pic_plt0_entry
[sizeof (elf_i386_nacl_plt0_entry
)] =
4933 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4934 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4935 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4936 0xff, 0xe1, /* jmp *%ecx */
4938 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4939 so pad to that size with nop instructions. */
4940 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4943 static const bfd_byte elf_i386_nacl_pic_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
4945 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4946 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4947 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4948 0xff, 0xe1, /* jmp *%ecx */
4950 /* Pad to the next 32-byte boundary with nop instructions. */
4952 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4953 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4955 /* Lazy GOT entries point here (32-byte aligned). */
4956 0x68, /* pushl immediate */
4957 0, 0, 0, 0, /* replaced with offset into relocation table. */
4958 0xe9, /* jmp relative */
4959 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4961 /* Pad to the next 32-byte boundary with nop instructions. */
4962 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4963 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4967 static const bfd_byte elf_i386_nacl_eh_frame_plt
[] =
4969 #if (PLT_CIE_LENGTH != 20 \
4970 || PLT_FDE_LENGTH != 36 \
4971 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4972 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4973 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
4975 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
4976 0, 0, 0, 0, /* CIE ID */
4977 1, /* CIE version */
4978 'z', 'R', 0, /* Augmentation string */
4979 1, /* Code alignment factor */
4980 0x7c, /* Data alignment factor: -4 */
4981 8, /* Return address column */
4982 1, /* Augmentation size */
4983 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
4984 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4985 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4986 DW_CFA_nop
, DW_CFA_nop
,
4988 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
4989 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
4990 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4991 0, 0, 0, 0, /* .plt size goes here */
4992 0, /* Augmentation size */
4993 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
4994 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4995 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
4996 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4997 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
4998 13, /* Block length */
4999 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
5000 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
5001 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5002 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
5003 DW_CFA_nop
, DW_CFA_nop
5006 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt
=
5008 elf_i386_nacl_plt0_entry
, /* plt0_entry */
5009 sizeof (elf_i386_nacl_plt0_entry
), /* plt0_entry_size */
5010 elf_i386_nacl_plt_entry
, /* plt_entry */
5011 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5012 2, /* plt0_got1_offset */
5013 8, /* plt0_got2_offset */
5014 0, /* plt0_got2_insn_end */
5015 2, /* plt_got_offset */
5016 33, /* plt_reloc_offset */
5017 38, /* plt_plt_offset */
5018 0, /* plt_got_insn_size */
5019 0, /* plt_plt_insn_end */
5020 32, /* plt_lazy_offset */
5021 elf_i386_nacl_pic_plt0_entry
, /* pic_plt0_entry */
5022 elf_i386_nacl_pic_plt_entry
, /* pic_plt_entry */
5023 elf_i386_nacl_eh_frame_plt
, /* eh_frame_plt */
5024 sizeof (elf_i386_nacl_eh_frame_plt
) /* eh_frame_plt_size */
5027 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed
=
5029 0x90, /* plt0_pad_byte: nop insn */
5034 elf32_i386_nacl_elf_object_p (bfd
*abfd
)
5036 /* Set the right machine number for a NaCl i386 ELF32 file. */
5037 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_i386_i386_nacl
);
5041 #undef elf_backend_arch_data
5042 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5044 #undef elf_backend_object_p
5045 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5046 #undef elf_backend_modify_segment_map
5047 #define elf_backend_modify_segment_map nacl_modify_segment_map
5048 #undef elf_backend_modify_program_headers
5049 #define elf_backend_modify_program_headers nacl_modify_program_headers
5050 #undef elf_backend_final_write_processing
5051 #define elf_backend_final_write_processing nacl_final_write_processing
5053 #include "elf32-target.h"
5055 /* Restore defaults. */
5056 #undef elf_backend_object_p
5057 #undef elf_backend_modify_segment_map
5058 #undef elf_backend_modify_program_headers
5059 #undef elf_backend_final_write_processing
5061 /* VxWorks support. */
5063 #undef TARGET_LITTLE_SYM
5064 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5065 #undef TARGET_LITTLE_NAME
5066 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5068 #undef ELF_MAXPAGESIZE
5069 #define ELF_MAXPAGESIZE 0x1000
5070 #undef elf_backend_plt_alignment
5071 #define elf_backend_plt_alignment 4
5073 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed
=
5075 0x90, /* plt0_pad_byte */
5079 #undef elf_backend_arch_data
5080 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5082 #undef elf_backend_relocs_compatible
5083 #undef elf_backend_add_symbol_hook
5084 #define elf_backend_add_symbol_hook \
5085 elf_vxworks_add_symbol_hook
5086 #undef elf_backend_link_output_symbol_hook
5087 #define elf_backend_link_output_symbol_hook \
5088 elf_vxworks_link_output_symbol_hook
5089 #undef elf_backend_emit_relocs
5090 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5091 #undef elf_backend_final_write_processing
5092 #define elf_backend_final_write_processing \
5093 elf_vxworks_final_write_processing
5094 #undef elf_backend_static_tls_alignment
5096 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5098 #undef elf_backend_want_plt_sym
5099 #define elf_backend_want_plt_sym 1
5102 #define elf32_bed elf32_i386_vxworks_bed
5104 #include "elf32-target.h"