1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
32 #include "opcode/i386.h"
34 /* 386 uses REL relocations instead of RELA. */
39 static reloc_howto_type elf_howto_table
[]=
41 HOWTO(R_386_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
42 bfd_elf_generic_reloc
, "R_386_NONE",
43 TRUE
, 0x00000000, 0x00000000, FALSE
),
44 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
45 bfd_elf_generic_reloc
, "R_386_32",
46 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
47 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
48 bfd_elf_generic_reloc
, "R_386_PC32",
49 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
50 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
51 bfd_elf_generic_reloc
, "R_386_GOT32",
52 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
53 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
54 bfd_elf_generic_reloc
, "R_386_PLT32",
55 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
56 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
57 bfd_elf_generic_reloc
, "R_386_COPY",
58 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
59 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
60 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
61 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
62 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
63 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
64 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
65 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
66 bfd_elf_generic_reloc
, "R_386_RELATIVE",
67 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
68 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
69 bfd_elf_generic_reloc
, "R_386_GOTOFF",
70 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
71 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
72 bfd_elf_generic_reloc
, "R_386_GOTPC",
73 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
84 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
85 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
86 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_386_TLS_IE",
88 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
89 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
90 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
91 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
92 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
93 bfd_elf_generic_reloc
, "R_386_TLS_LE",
94 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
95 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_386_TLS_GD",
97 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
98 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
100 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
101 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_386_16",
103 TRUE
, 0xffff, 0xffff, FALSE
),
104 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
105 bfd_elf_generic_reloc
, "R_386_PC16",
106 TRUE
, 0xffff, 0xffff, TRUE
),
107 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
108 bfd_elf_generic_reloc
, "R_386_8",
109 TRUE
, 0xff, 0xff, FALSE
),
110 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
111 bfd_elf_generic_reloc
, "R_386_PC8",
112 TRUE
, 0xff, 0xff, TRUE
),
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
118 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
119 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
120 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
121 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
122 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
123 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
124 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
125 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
126 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
127 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
128 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
129 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
130 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
131 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
132 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
133 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
134 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
135 HOWTO(R_386_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
136 bfd_elf_generic_reloc
, "R_386_SIZE32",
137 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
138 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
139 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
140 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
141 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
142 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
144 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
145 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
146 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
147 HOWTO(R_386_IRELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
148 bfd_elf_generic_reloc
, "R_386_IRELATIVE",
149 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
150 HOWTO(R_386_GOT32X
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
151 bfd_elf_generic_reloc
, "R_386_GOT32X",
152 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT
, /* type */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
163 FALSE
, /* pc_relative */
165 complain_overflow_dont
, /* complain_on_overflow */
166 NULL
, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE
, /* partial_inplace */
171 FALSE
), /* pcrel_offset */
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY
, /* type */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
178 FALSE
, /* pc_relative */
180 complain_overflow_dont
, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE
, /* partial_inplace */
186 FALSE
) /* pcrel_offset */
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
192 #ifdef DEBUG_GEN_RELOC
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
199 static reloc_howto_type
*
200 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
201 bfd_reloc_code_real_type code
)
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table
[R_386_NONE
];
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table
[R_386_32
];
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table
[R_386_32
];
217 case BFD_RELOC_32_PCREL
:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table
[R_386_PC32
];
221 case BFD_RELOC_386_GOT32
:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table
[R_386_GOT32
];
225 case BFD_RELOC_386_PLT32
:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table
[R_386_PLT32
];
229 case BFD_RELOC_386_COPY
:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table
[R_386_COPY
];
233 case BFD_RELOC_386_GLOB_DAT
:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table
[R_386_GLOB_DAT
];
237 case BFD_RELOC_386_JUMP_SLOT
:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table
[R_386_JUMP_SLOT
];
241 case BFD_RELOC_386_RELATIVE
:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table
[R_386_RELATIVE
];
245 case BFD_RELOC_386_GOTOFF
:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table
[R_386_GOTOFF
];
249 case BFD_RELOC_386_GOTPC
:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table
[R_386_GOTPC
];
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF
:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
258 case BFD_RELOC_386_TLS_IE
:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
262 case BFD_RELOC_386_TLS_GOTIE
:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
266 case BFD_RELOC_386_TLS_LE
:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
270 case BFD_RELOC_386_TLS_GD
:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
274 case BFD_RELOC_386_TLS_LDM
:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
282 case BFD_RELOC_16_PCREL
:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
290 case BFD_RELOC_8_PCREL
:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32
:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
299 case BFD_RELOC_386_TLS_IE_32
:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
303 case BFD_RELOC_386_TLS_LE_32
:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
307 case BFD_RELOC_386_TLS_DTPMOD32
:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
311 case BFD_RELOC_386_TLS_DTPOFF32
:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
315 case BFD_RELOC_386_TLS_TPOFF32
:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
319 case BFD_RELOC_SIZE32
:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table
[R_386_SIZE32
- R_386_tls_offset
];
323 case BFD_RELOC_386_TLS_GOTDESC
:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
327 case BFD_RELOC_386_TLS_DESC_CALL
:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
331 case BFD_RELOC_386_TLS_DESC
:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
335 case BFD_RELOC_386_IRELATIVE
:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table
[R_386_IRELATIVE
- R_386_tls_offset
];
339 case BFD_RELOC_386_GOT32X
:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table
[R_386_GOT32X
- R_386_tls_offset
];
343 case BFD_RELOC_VTABLE_INHERIT
:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
347 case BFD_RELOC_VTABLE_ENTRY
:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
359 static reloc_howto_type
*
360 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
365 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
366 if (elf_howto_table
[i
].name
!= NULL
367 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
368 return &elf_howto_table
[i
];
373 static reloc_howto_type
*
374 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
378 if ((indx
= r_type
) >= R_386_standard
379 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
380 >= R_386_ext
- R_386_standard
)
381 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
382 >= R_386_ext2
- R_386_ext
)
383 && ((indx
= r_type
- R_386_vt_offset
) - R_386_ext2
384 >= R_386_vt
- R_386_ext2
))
386 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table
[indx
].type
!= r_type
)
393 return &elf_howto_table
[indx
];
397 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
399 Elf_Internal_Rela
*dst
)
401 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
402 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
412 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
414 if (name
[0] == '.' && name
[1] == 'X')
417 return _bfd_elf_is_local_label_name (abfd
, name
);
420 /* Support for core dump NOTE sections. */
423 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
428 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
430 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
436 elf_tdata (abfd
)->core
->signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
439 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
443 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
447 switch (note
->descsz
)
452 case 144: /* Linux/i386 */
454 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
457 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
469 size
, note
->descpos
+ offset
);
473 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
475 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
477 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
482 elf_tdata (abfd
)->core
->program
483 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
484 elf_tdata (abfd
)->core
->command
485 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
489 switch (note
->descsz
)
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd
)->core
->pid
496 = bfd_get_32 (abfd
, note
->descdata
+ 12);
497 elf_tdata (abfd
)->core
->program
498 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
499 elf_tdata (abfd
)->core
->command
500 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
508 char *command
= elf_tdata (abfd
)->core
->command
;
509 int n
= strlen (command
);
511 if (0 < n
&& command
[n
- 1] == ' ')
512 command
[n
- 1] = '\0';
518 /* Functions for the i386 ELF linker.
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
532 /* The name of the dynamic interpreter. This is put in the .interp
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
541 #define ELIMINATE_COPY_RELOCS 1
543 /* The size in bytes of an entry in the procedure linkage table. */
545 #define PLT_ENTRY_SIZE 16
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
551 static const bfd_byte elf_i386_plt0_entry
[12] =
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
559 /* Subsequent entries in an absolute procedure linkage table look like
562 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
575 static const bfd_byte elf_i386_pic_plt0_entry
[12] =
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
583 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
593 /* Entries in the GOT procedure linkage table look like this. */
595 static const bfd_byte elf_i386_got_plt_entry
[8] =
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
602 /* Entries in the PIC GOT procedure linkage table look like this. */
604 static const bfd_byte elf_i386_pic_got_plt_entry
[8] =
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
611 /* .eh_frame covering the .plt section. */
613 static const bfd_byte elf_i386_eh_frame_plt
[] =
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
628 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop
, DW_CFA_nop
,
632 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
646 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
647 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
650 struct elf_i386_plt_layout
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte
*plt0_entry
;
654 unsigned int plt0_entry_size
;
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset
;
658 unsigned int plt0_got2_offset
;
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte
*plt_entry
;
662 unsigned int plt_entry_size
;
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset
;
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte
*pic_plt0_entry
;
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte
*pic_plt_entry
;
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte
*eh_frame_plt
;
680 unsigned int eh_frame_plt_size
;
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt
=
689 elf_i386_plt0_entry
, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry
), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry
, /* plt_entry */
694 PLT_ENTRY_SIZE
, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry
, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry
, /* pic_plt_entry */
701 elf_i386_eh_frame_plt
, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt
), /* eh_frame_plt_size */
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
712 /* Architecture-specific backend data for i386. */
714 struct elf_i386_backend_data
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout
*plt
;
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte
;
722 /* True if the target system is VxWorks. */
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed
=
733 &elf_i386_plt
, /* plt */
734 0, /* plt0_pad_byte */
738 #define elf_backend_arch_data &elf_i386_arch_bed
740 /* i386 ELF linker hash entry. */
742 struct elf_i386_link_hash_entry
744 struct elf_link_hash_entry elf
;
746 /* Track dynamic relocs copied for this symbol. */
747 struct elf_dyn_relocs
*dyn_relocs
;
749 #define GOT_UNKNOWN 0
753 #define GOT_TLS_IE_POS 5
754 #define GOT_TLS_IE_NEG 6
755 #define GOT_TLS_IE_BOTH 7
756 #define GOT_TLS_GDESC 8
757 #define GOT_TLS_GD_BOTH_P(type) \
758 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
759 #define GOT_TLS_GD_P(type) \
760 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
761 #define GOT_TLS_GDESC_P(type) \
762 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GD_ANY_P(type) \
764 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
765 unsigned char tls_type
;
767 /* Symbol is referenced by R_386_GOTOFF relocation. */
768 unsigned int gotoff_ref
: 1;
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount
;
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got
;
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
783 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
785 struct elf_i386_obj_tdata
787 struct elf_obj_tdata root
;
789 /* tls_type for each local got entry. */
790 char *local_got_tls_type
;
792 /* GOTPLT entries for TLS descriptors. */
793 bfd_vma
*local_tlsdesc_gotent
;
796 #define elf_i386_tdata(abfd) \
797 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
799 #define elf_i386_local_got_tls_type(abfd) \
800 (elf_i386_tdata (abfd)->local_got_tls_type)
802 #define elf_i386_local_tlsdesc_gotent(abfd) \
803 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
805 #define is_i386_elf(bfd) \
806 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
807 && elf_tdata (bfd) != NULL \
808 && elf_object_id (bfd) == I386_ELF_DATA)
811 elf_i386_mkobject (bfd
*abfd
)
813 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_i386_obj_tdata
),
817 /* i386 ELF linker hash table. */
819 struct elf_i386_link_hash_table
821 struct elf_link_hash_table elf
;
823 /* Short-cuts to get to dynamic linker sections. */
826 asection
*plt_eh_frame
;
831 bfd_signed_vma refcount
;
835 /* The amount of space used by the reserved portion of the sgotplt
836 section, plus whatever space is used by the jump slots. */
837 bfd_vma sgotplt_jump_table_size
;
839 /* Small local sym cache. */
840 struct sym_cache sym_cache
;
842 /* _TLS_MODULE_BASE_ symbol. */
843 struct bfd_link_hash_entry
*tls_module_base
;
845 /* Used by local STT_GNU_IFUNC symbols. */
846 htab_t loc_hash_table
;
847 void * loc_hash_memory
;
849 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
852 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
853 bfd_vma next_tls_desc_index
;
855 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
856 bfd_vma next_jump_slot_index
;
858 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
859 bfd_vma next_irelative_index
;
862 /* Get the i386 ELF linker hash table from a link_info structure. */
864 #define elf_i386_hash_table(p) \
865 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
866 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
868 #define elf_i386_compute_jump_table_size(htab) \
869 ((htab)->elf.srelplt->reloc_count * 4)
871 /* Create an entry in an i386 ELF linker hash table. */
873 static struct bfd_hash_entry
*
874 elf_i386_link_hash_newfunc (struct bfd_hash_entry
*entry
,
875 struct bfd_hash_table
*table
,
878 /* Allocate the structure if it has not already been allocated by a
882 entry
= (struct bfd_hash_entry
*)
883 bfd_hash_allocate (table
, sizeof (struct elf_i386_link_hash_entry
));
888 /* Call the allocation method of the superclass. */
889 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
892 struct elf_i386_link_hash_entry
*eh
;
894 eh
= (struct elf_i386_link_hash_entry
*) entry
;
895 eh
->dyn_relocs
= NULL
;
896 eh
->tls_type
= GOT_UNKNOWN
;
898 eh
->func_pointer_refcount
= 0;
899 eh
->plt_got
.offset
= (bfd_vma
) -1;
900 eh
->tlsdesc_got
= (bfd_vma
) -1;
906 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
907 for local symbol so that we can handle local STT_GNU_IFUNC symbols
908 as global symbol. We reuse indx and dynstr_index for local symbol
909 hash since they aren't used by global symbols in this backend. */
912 elf_i386_local_htab_hash (const void *ptr
)
914 struct elf_link_hash_entry
*h
915 = (struct elf_link_hash_entry
*) ptr
;
916 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
919 /* Compare local hash entries. */
922 elf_i386_local_htab_eq (const void *ptr1
, const void *ptr2
)
924 struct elf_link_hash_entry
*h1
925 = (struct elf_link_hash_entry
*) ptr1
;
926 struct elf_link_hash_entry
*h2
927 = (struct elf_link_hash_entry
*) ptr2
;
929 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
932 /* Find and/or create a hash entry for local symbol. */
934 static struct elf_link_hash_entry
*
935 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table
*htab
,
936 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
939 struct elf_i386_link_hash_entry e
, *ret
;
940 asection
*sec
= abfd
->sections
;
941 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
942 ELF32_R_SYM (rel
->r_info
));
945 e
.elf
.indx
= sec
->id
;
946 e
.elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
947 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
948 create
? INSERT
: NO_INSERT
);
955 ret
= (struct elf_i386_link_hash_entry
*) *slot
;
959 ret
= (struct elf_i386_link_hash_entry
*)
960 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
961 sizeof (struct elf_i386_link_hash_entry
));
964 memset (ret
, 0, sizeof (*ret
));
965 ret
->elf
.indx
= sec
->id
;
966 ret
->elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
967 ret
->elf
.dynindx
= -1;
968 ret
->func_pointer_refcount
= 0;
969 ret
->plt_got
.offset
= (bfd_vma
) -1;
975 /* Destroy an i386 ELF linker hash table. */
978 elf_i386_link_hash_table_free (bfd
*obfd
)
980 struct elf_i386_link_hash_table
*htab
981 = (struct elf_i386_link_hash_table
*) obfd
->link
.hash
;
983 if (htab
->loc_hash_table
)
984 htab_delete (htab
->loc_hash_table
);
985 if (htab
->loc_hash_memory
)
986 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
987 _bfd_elf_link_hash_table_free (obfd
);
990 /* Create an i386 ELF linker hash table. */
992 static struct bfd_link_hash_table
*
993 elf_i386_link_hash_table_create (bfd
*abfd
)
995 struct elf_i386_link_hash_table
*ret
;
996 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
998 ret
= (struct elf_i386_link_hash_table
*) bfd_zmalloc (amt
);
1002 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1003 elf_i386_link_hash_newfunc
,
1004 sizeof (struct elf_i386_link_hash_entry
),
1011 ret
->loc_hash_table
= htab_try_create (1024,
1012 elf_i386_local_htab_hash
,
1013 elf_i386_local_htab_eq
,
1015 ret
->loc_hash_memory
= objalloc_create ();
1016 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1018 elf_i386_link_hash_table_free (abfd
);
1021 ret
->elf
.root
.hash_table_free
= elf_i386_link_hash_table_free
;
1023 return &ret
->elf
.root
;
1026 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1027 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1031 elf_i386_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1033 struct elf_i386_link_hash_table
*htab
;
1035 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1038 htab
= elf_i386_hash_table (info
);
1042 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1046 if (bfd_link_executable (info
))
1048 /* Always allow copy relocs for building executables. */
1049 asection
*s
= bfd_get_linker_section (dynobj
, ".rel.bss");
1052 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1053 s
= bfd_make_section_anyway_with_flags (dynobj
,
1055 (bed
->dynamic_sec_flags
1058 || ! bfd_set_section_alignment (dynobj
, s
,
1059 bed
->s
->log_file_align
))
1065 if (get_elf_i386_backend_data (dynobj
)->is_vxworks
1066 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
1070 if (!info
->no_ld_generated_unwind_info
1071 && htab
->plt_eh_frame
== NULL
1072 && htab
->elf
.splt
!= NULL
)
1074 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1075 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1076 | SEC_LINKER_CREATED
);
1078 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1079 if (htab
->plt_eh_frame
== NULL
1080 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 2))
1087 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1090 elf_i386_copy_indirect_symbol (struct bfd_link_info
*info
,
1091 struct elf_link_hash_entry
*dir
,
1092 struct elf_link_hash_entry
*ind
)
1094 struct elf_i386_link_hash_entry
*edir
, *eind
;
1096 edir
= (struct elf_i386_link_hash_entry
*) dir
;
1097 eind
= (struct elf_i386_link_hash_entry
*) ind
;
1099 if (eind
->dyn_relocs
!= NULL
)
1101 if (edir
->dyn_relocs
!= NULL
)
1103 struct elf_dyn_relocs
**pp
;
1104 struct elf_dyn_relocs
*p
;
1106 /* Add reloc counts against the indirect sym to the direct sym
1107 list. Merge any entries against the same section. */
1108 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1110 struct elf_dyn_relocs
*q
;
1112 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1113 if (q
->sec
== p
->sec
)
1115 q
->pc_count
+= p
->pc_count
;
1116 q
->count
+= p
->count
;
1123 *pp
= edir
->dyn_relocs
;
1126 edir
->dyn_relocs
= eind
->dyn_relocs
;
1127 eind
->dyn_relocs
= NULL
;
1130 if (ind
->root
.type
== bfd_link_hash_indirect
1131 && dir
->got
.refcount
<= 0)
1133 edir
->tls_type
= eind
->tls_type
;
1134 eind
->tls_type
= GOT_UNKNOWN
;
1137 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1138 generate a R_386_COPY reloc. */
1139 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1141 if (ELIMINATE_COPY_RELOCS
1142 && ind
->root
.type
!= bfd_link_hash_indirect
1143 && dir
->dynamic_adjusted
)
1145 /* If called to transfer flags for a weakdef during processing
1146 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1147 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1148 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1149 dir
->ref_regular
|= ind
->ref_regular
;
1150 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1151 dir
->needs_plt
|= ind
->needs_plt
;
1152 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1156 if (eind
->func_pointer_refcount
> 0)
1158 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1159 eind
->func_pointer_refcount
= 0;
1162 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1166 /* Return TRUE if the TLS access code sequence support transition
1170 elf_i386_check_tls_transition (bfd
*abfd
, asection
*sec
,
1172 Elf_Internal_Shdr
*symtab_hdr
,
1173 struct elf_link_hash_entry
**sym_hashes
,
1174 unsigned int r_type
,
1175 const Elf_Internal_Rela
*rel
,
1176 const Elf_Internal_Rela
*relend
)
1178 unsigned int val
, type
;
1179 unsigned long r_symndx
;
1180 struct elf_link_hash_entry
*h
;
1183 /* Get the section contents. */
1184 if (contents
== NULL
)
1186 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1187 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1190 /* FIXME: How to better handle error condition? */
1191 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1194 /* Cache the section contents for elf_link_input_bfd. */
1195 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1199 offset
= rel
->r_offset
;
1204 if (offset
< 2 || (rel
+ 1) >= relend
)
1207 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1208 if (r_type
== R_386_TLS_GD
)
1210 /* Check transition from GD access model. Only
1211 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1212 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1213 can transit to different access model. */
1214 if ((offset
+ 10) > sec
->size
||
1215 (type
!= 0x8d && type
!= 0x04))
1218 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1221 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1225 if (bfd_get_8 (abfd
, contents
+ offset
- 3) != 0x8d)
1228 if ((val
& 0xc7) != 0x05 || val
== (4 << 3))
1233 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1234 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1237 if (bfd_get_8 (abfd
, contents
+ offset
+ 9) != 0x90)
1243 /* Check transition from LD access model. Only
1244 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1245 can transit to different access model. */
1246 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
1249 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1250 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1254 if (bfd_get_8 (abfd
, contents
+ offset
+ 4) != 0xe8)
1257 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
1258 if (r_symndx
< symtab_hdr
->sh_info
)
1261 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1262 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1263 may be versioned. */
1265 && h
->root
.root
.string
!= NULL
1266 && (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
1267 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
)
1268 && (strncmp (h
->root
.root
.string
, "___tls_get_addr",
1272 /* Check transition from IE access model:
1273 movl foo@indntpoff(%rip), %eax
1274 movl foo@indntpoff(%rip), %reg
1275 addl foo@indntpoff(%rip), %reg
1278 if (offset
< 1 || (offset
+ 4) > sec
->size
)
1281 /* Check "movl foo@tpoff(%rip), %eax" first. */
1282 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1289 /* Check movl|addl foo@tpoff(%rip), %reg. */
1290 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1291 return ((type
== 0x8b || type
== 0x03)
1292 && (val
& 0xc7) == 0x05);
1294 case R_386_TLS_GOTIE
:
1295 case R_386_TLS_IE_32
:
1296 /* Check transition from {IE_32,GOTIE} access model:
1297 subl foo@{tpoff,gontoff}(%reg1), %reg2
1298 movl foo@{tpoff,gontoff}(%reg1), %reg2
1299 addl foo@{tpoff,gontoff}(%reg1), %reg2
1302 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1305 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1306 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1309 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1310 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1312 case R_386_TLS_GOTDESC
:
1313 /* Check transition from GDesc access model:
1314 leal x@tlsdesc(%ebx), %eax
1316 Make sure it's a leal adding ebx to a 32-bit offset
1317 into any register, although it's probably almost always
1320 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1323 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1326 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1327 return (val
& 0xc7) == 0x83;
1329 case R_386_TLS_DESC_CALL
:
1330 /* Check transition from GDesc access model:
1331 call *x@tlsdesc(%rax)
1333 if (offset
+ 2 <= sec
->size
)
1335 /* Make sure that it's a call *x@tlsdesc(%rax). */
1336 static const unsigned char call
[] = { 0xff, 0x10 };
1337 return memcmp (contents
+ offset
, call
, 2) == 0;
1347 /* Return TRUE if the TLS access transition is OK or no transition
1348 will be performed. Update R_TYPE if there is a transition. */
1351 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1352 asection
*sec
, bfd_byte
*contents
,
1353 Elf_Internal_Shdr
*symtab_hdr
,
1354 struct elf_link_hash_entry
**sym_hashes
,
1355 unsigned int *r_type
, int tls_type
,
1356 const Elf_Internal_Rela
*rel
,
1357 const Elf_Internal_Rela
*relend
,
1358 struct elf_link_hash_entry
*h
,
1359 unsigned long r_symndx
)
1361 unsigned int from_type
= *r_type
;
1362 unsigned int to_type
= from_type
;
1363 bfd_boolean check
= TRUE
;
1365 /* Skip TLS transition for functions. */
1367 && (h
->type
== STT_FUNC
1368 || h
->type
== STT_GNU_IFUNC
))
1374 case R_386_TLS_GOTDESC
:
1375 case R_386_TLS_DESC_CALL
:
1376 case R_386_TLS_IE_32
:
1378 case R_386_TLS_GOTIE
:
1379 if (bfd_link_executable (info
))
1382 to_type
= R_386_TLS_LE_32
;
1383 else if (from_type
!= R_386_TLS_IE
1384 && from_type
!= R_386_TLS_GOTIE
)
1385 to_type
= R_386_TLS_IE_32
;
1388 /* When we are called from elf_i386_relocate_section, CONTENTS
1389 isn't NULL and there may be additional transitions based on
1391 if (contents
!= NULL
)
1393 unsigned int new_to_type
= to_type
;
1395 if (bfd_link_executable (info
)
1398 && (tls_type
& GOT_TLS_IE
))
1399 new_to_type
= R_386_TLS_LE_32
;
1401 if (to_type
== R_386_TLS_GD
1402 || to_type
== R_386_TLS_GOTDESC
1403 || to_type
== R_386_TLS_DESC_CALL
)
1405 if (tls_type
== GOT_TLS_IE_POS
)
1406 new_to_type
= R_386_TLS_GOTIE
;
1407 else if (tls_type
& GOT_TLS_IE
)
1408 new_to_type
= R_386_TLS_IE_32
;
1411 /* We checked the transition before when we were called from
1412 elf_i386_check_relocs. We only want to check the new
1413 transition which hasn't been checked before. */
1414 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1415 to_type
= new_to_type
;
1421 if (bfd_link_executable (info
))
1422 to_type
= R_386_TLS_LE_32
;
1429 /* Return TRUE if there is no transition. */
1430 if (from_type
== to_type
)
1433 /* Check if the transition can be performed. */
1435 && ! elf_i386_check_tls_transition (abfd
, sec
, contents
,
1436 symtab_hdr
, sym_hashes
,
1437 from_type
, rel
, relend
))
1439 reloc_howto_type
*from
, *to
;
1442 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1443 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1446 name
= h
->root
.root
.string
;
1449 struct elf_i386_link_hash_table
*htab
;
1451 htab
= elf_i386_hash_table (info
);
1456 Elf_Internal_Sym
*isym
;
1458 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1460 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1464 (*_bfd_error_handler
)
1465 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1466 "in section `%A' failed"),
1467 abfd
, sec
, from
->name
, to
->name
, name
,
1468 (unsigned long) rel
->r_offset
);
1469 bfd_set_error (bfd_error_bad_value
);
1477 /* Rename some of the generic section flags to better document how they
1479 #define need_convert_load sec_flg0
1481 /* Look through the relocs for a section during the first phase, and
1482 calculate needed space in the global offset table, procedure linkage
1483 table, and dynamic reloc sections. */
1486 elf_i386_check_relocs (bfd
*abfd
,
1487 struct bfd_link_info
*info
,
1489 const Elf_Internal_Rela
*relocs
)
1491 struct elf_i386_link_hash_table
*htab
;
1492 Elf_Internal_Shdr
*symtab_hdr
;
1493 struct elf_link_hash_entry
**sym_hashes
;
1494 const Elf_Internal_Rela
*rel
;
1495 const Elf_Internal_Rela
*rel_end
;
1497 bfd_boolean use_plt_got
;
1499 if (bfd_link_relocatable (info
))
1502 BFD_ASSERT (is_i386_elf (abfd
));
1504 htab
= elf_i386_hash_table (info
);
1508 use_plt_got
= (!get_elf_i386_backend_data (abfd
)->is_vxworks
1509 && (get_elf_i386_backend_data (abfd
)
1510 == &elf_i386_arch_bed
));
1512 symtab_hdr
= &elf_symtab_hdr (abfd
);
1513 sym_hashes
= elf_sym_hashes (abfd
);
1517 rel_end
= relocs
+ sec
->reloc_count
;
1518 for (rel
= relocs
; rel
< rel_end
; rel
++)
1520 unsigned int r_type
;
1521 unsigned long r_symndx
;
1522 struct elf_link_hash_entry
*h
;
1523 struct elf_i386_link_hash_entry
*eh
;
1524 Elf_Internal_Sym
*isym
;
1526 bfd_boolean size_reloc
;
1528 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1529 r_type
= ELF32_R_TYPE (rel
->r_info
);
1531 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1533 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1539 if (r_symndx
< symtab_hdr
->sh_info
)
1541 /* A local symbol. */
1542 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1547 /* Check relocation against local STT_GNU_IFUNC symbol. */
1548 if (ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1550 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
, TRUE
);
1554 /* Fake a STT_GNU_IFUNC symbol. */
1555 h
->type
= STT_GNU_IFUNC
;
1558 h
->forced_local
= 1;
1559 h
->root
.type
= bfd_link_hash_defined
;
1567 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1568 while (h
->root
.type
== bfd_link_hash_indirect
1569 || h
->root
.type
== bfd_link_hash_warning
)
1570 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1573 eh
= (struct elf_i386_link_hash_entry
*) h
;
1576 /* Create the ifunc sections for static executables. If we
1577 never see an indirect function symbol nor we are building
1578 a static executable, those sections will be empty and
1579 won't appear in output. */
1592 if (htab
->elf
.dynobj
== NULL
)
1593 htab
->elf
.dynobj
= abfd
;
1594 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1599 /* It is referenced by a non-shared object. */
1601 h
->root
.non_ir_ref
= 1;
1603 if (h
->type
== STT_GNU_IFUNC
)
1604 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1605 |= elf_gnu_symbol_ifunc
;
1608 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1609 symtab_hdr
, sym_hashes
,
1610 &r_type
, GOT_UNKNOWN
,
1611 rel
, rel_end
, h
, r_symndx
))
1617 htab
->tls_ldm_got
.refcount
+= 1;
1621 /* This symbol requires a procedure linkage table entry. We
1622 actually build the entry in adjust_dynamic_symbol,
1623 because this might be a case of linking PIC code which is
1624 never referenced by a dynamic object, in which case we
1625 don't need to generate a procedure linkage table entry
1628 /* If this is a local symbol, we resolve it directly without
1629 creating a procedure linkage table entry. */
1634 h
->plt
.refcount
+= 1;
1641 case R_386_TLS_IE_32
:
1643 case R_386_TLS_GOTIE
:
1644 if (!bfd_link_executable (info
))
1645 info
->flags
|= DF_STATIC_TLS
;
1651 case R_386_TLS_GOTDESC
:
1652 case R_386_TLS_DESC_CALL
:
1653 /* This symbol requires a global offset table entry. */
1655 int tls_type
, old_tls_type
;
1662 tls_type
= GOT_NORMAL
;
1664 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
1665 case R_386_TLS_GOTDESC
:
1666 case R_386_TLS_DESC_CALL
:
1667 tls_type
= GOT_TLS_GDESC
; break;
1668 case R_386_TLS_IE_32
:
1669 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
1670 tls_type
= GOT_TLS_IE_NEG
;
1672 /* If this is a GD->IE transition, we may use either of
1673 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1674 tls_type
= GOT_TLS_IE
;
1677 case R_386_TLS_GOTIE
:
1678 tls_type
= GOT_TLS_IE_POS
; break;
1683 h
->got
.refcount
+= 1;
1684 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1688 bfd_signed_vma
*local_got_refcounts
;
1690 /* This is a global offset table entry for a local symbol. */
1691 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1692 if (local_got_refcounts
== NULL
)
1696 size
= symtab_hdr
->sh_info
;
1697 size
*= (sizeof (bfd_signed_vma
)
1698 + sizeof (bfd_vma
) + sizeof(char));
1699 local_got_refcounts
= (bfd_signed_vma
*)
1700 bfd_zalloc (abfd
, size
);
1701 if (local_got_refcounts
== NULL
)
1703 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1704 elf_i386_local_tlsdesc_gotent (abfd
)
1705 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1706 elf_i386_local_got_tls_type (abfd
)
1707 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1709 local_got_refcounts
[r_symndx
] += 1;
1710 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
1713 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1714 tls_type
|= old_tls_type
;
1715 /* If a TLS symbol is accessed using IE at least once,
1716 there is no point to use dynamic model for it. */
1717 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1718 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1719 || (tls_type
& GOT_TLS_IE
) == 0))
1721 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
1722 tls_type
= old_tls_type
;
1723 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1724 && GOT_TLS_GD_ANY_P (tls_type
))
1725 tls_type
|= old_tls_type
;
1729 name
= h
->root
.root
.string
;
1731 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1733 (*_bfd_error_handler
)
1734 (_("%B: `%s' accessed both as normal and "
1735 "thread local symbol"),
1737 bfd_set_error (bfd_error_bad_value
);
1742 if (old_tls_type
!= tls_type
)
1745 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
1747 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1755 if (htab
->elf
.sgot
== NULL
)
1757 if (htab
->elf
.dynobj
== NULL
)
1758 htab
->elf
.dynobj
= abfd
;
1759 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
, info
))
1762 if (r_type
!= R_386_TLS_IE
)
1766 case R_386_TLS_LE_32
:
1768 if (bfd_link_executable (info
))
1770 info
->flags
|= DF_STATIC_TLS
;
1775 if (h
!= NULL
&& bfd_link_executable (info
))
1777 /* If this reloc is in a read-only section, we might
1778 need a copy reloc. We can't check reliably at this
1779 stage whether the section is read-only, as input
1780 sections have not yet been mapped to output sections.
1781 Tentatively set the flag for now, and correct in
1782 adjust_dynamic_symbol. */
1785 /* We may need a .plt entry if the function this reloc
1786 refers to is in a shared lib. */
1787 h
->plt
.refcount
+= 1;
1788 if (r_type
== R_386_PC32
)
1790 /* Since something like ".long foo - ." may be used
1791 as pointer, make sure that PLT is used if foo is
1792 a function defined in a shared library. */
1793 if ((sec
->flags
& SEC_CODE
) == 0)
1794 h
->pointer_equality_needed
= 1;
1798 h
->pointer_equality_needed
= 1;
1799 /* R_386_32 can be resolved at run-time. */
1800 if (r_type
== R_386_32
1801 && (sec
->flags
& SEC_READONLY
) == 0)
1802 eh
->func_pointer_refcount
+= 1;
1808 /* If we are creating a shared library, and this is a reloc
1809 against a global symbol, or a non PC relative reloc
1810 against a local symbol, then we need to copy the reloc
1811 into the shared library. However, if we are linking with
1812 -Bsymbolic, we do not need to copy a reloc against a
1813 global symbol which is defined in an object we are
1814 including in the link (i.e., DEF_REGULAR is set). At
1815 this point we have not seen all the input files, so it is
1816 possible that DEF_REGULAR is not set now but will be set
1817 later (it is never cleared). In case of a weak definition,
1818 DEF_REGULAR may be cleared later by a strong definition in
1819 a shared library. We account for that possibility below by
1820 storing information in the relocs_copied field of the hash
1821 table entry. A similar situation occurs when creating
1822 shared libraries and symbol visibility changes render the
1825 If on the other hand, we are creating an executable, we
1826 may need to keep relocations for symbols satisfied by a
1827 dynamic library if we manage to avoid copy relocs for the
1829 if ((bfd_link_pic (info
)
1830 && (sec
->flags
& SEC_ALLOC
) != 0
1831 && (r_type
!= R_386_PC32
1833 && (! SYMBOLIC_BIND (info
, h
)
1834 || h
->root
.type
== bfd_link_hash_defweak
1835 || !h
->def_regular
))))
1836 || (ELIMINATE_COPY_RELOCS
1837 && !bfd_link_pic (info
)
1838 && (sec
->flags
& SEC_ALLOC
) != 0
1840 && (h
->root
.type
== bfd_link_hash_defweak
1841 || !h
->def_regular
)))
1843 struct elf_dyn_relocs
*p
;
1844 struct elf_dyn_relocs
**head
;
1846 /* We must copy these reloc types into the output file.
1847 Create a reloc section in dynobj and make room for
1851 if (htab
->elf
.dynobj
== NULL
)
1852 htab
->elf
.dynobj
= abfd
;
1854 sreloc
= _bfd_elf_make_dynamic_reloc_section
1855 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
1861 /* If this is a global symbol, we count the number of
1862 relocations we need for this symbol. */
1865 head
= &eh
->dyn_relocs
;
1869 /* Track dynamic relocs needed for local syms too.
1870 We really need local syms available to do this
1875 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1880 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1884 vpp
= &elf_section_data (s
)->local_dynrel
;
1885 head
= (struct elf_dyn_relocs
**)vpp
;
1889 if (p
== NULL
|| p
->sec
!= sec
)
1891 bfd_size_type amt
= sizeof *p
;
1892 p
= (struct elf_dyn_relocs
*) bfd_alloc (htab
->elf
.dynobj
,
1904 /* Count size relocation as PC-relative relocation. */
1905 if (r_type
== R_386_PC32
|| size_reloc
)
1910 /* This relocation describes the C++ object vtable hierarchy.
1911 Reconstruct it for later use during GC. */
1912 case R_386_GNU_VTINHERIT
:
1913 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1917 /* This relocation describes which C++ vtable entries are actually
1918 used. Record for later use during GC. */
1919 case R_386_GNU_VTENTRY
:
1920 BFD_ASSERT (h
!= NULL
);
1922 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1932 && h
->plt
.refcount
> 0
1933 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
1934 || h
->got
.refcount
> 0)
1935 && htab
->plt_got
== NULL
)
1937 /* Create the GOT procedure linkage table. */
1938 unsigned int plt_got_align
;
1939 const struct elf_backend_data
*bed
;
1941 bed
= get_elf_backend_data (info
->output_bfd
);
1942 BFD_ASSERT (sizeof (elf_i386_got_plt_entry
) == 8
1943 && (sizeof (elf_i386_got_plt_entry
)
1944 == sizeof (elf_i386_pic_got_plt_entry
)));
1947 if (htab
->elf
.dynobj
== NULL
)
1948 htab
->elf
.dynobj
= abfd
;
1950 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1952 (bed
->dynamic_sec_flags
1957 if (htab
->plt_got
== NULL
1958 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1964 if ((r_type
== R_386_GOT32
|| r_type
== R_386_GOT32X
)
1965 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1966 sec
->need_convert_load
= 1;
1972 /* Return the section that should be marked against GC for a given
1976 elf_i386_gc_mark_hook (asection
*sec
,
1977 struct bfd_link_info
*info
,
1978 Elf_Internal_Rela
*rel
,
1979 struct elf_link_hash_entry
*h
,
1980 Elf_Internal_Sym
*sym
)
1983 switch (ELF32_R_TYPE (rel
->r_info
))
1985 case R_386_GNU_VTINHERIT
:
1986 case R_386_GNU_VTENTRY
:
1990 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1993 /* Update the got entry reference counts for the section being removed. */
1996 elf_i386_gc_sweep_hook (bfd
*abfd
,
1997 struct bfd_link_info
*info
,
1999 const Elf_Internal_Rela
*relocs
)
2001 struct elf_i386_link_hash_table
*htab
;
2002 Elf_Internal_Shdr
*symtab_hdr
;
2003 struct elf_link_hash_entry
**sym_hashes
;
2004 bfd_signed_vma
*local_got_refcounts
;
2005 const Elf_Internal_Rela
*rel
, *relend
;
2007 if (bfd_link_relocatable (info
))
2010 htab
= elf_i386_hash_table (info
);
2014 elf_section_data (sec
)->local_dynrel
= NULL
;
2016 symtab_hdr
= &elf_symtab_hdr (abfd
);
2017 sym_hashes
= elf_sym_hashes (abfd
);
2018 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2020 relend
= relocs
+ sec
->reloc_count
;
2021 for (rel
= relocs
; rel
< relend
; rel
++)
2023 unsigned long r_symndx
;
2024 unsigned int r_type
;
2025 struct elf_link_hash_entry
*h
= NULL
;
2027 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2028 if (r_symndx
>= symtab_hdr
->sh_info
)
2030 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2031 while (h
->root
.type
== bfd_link_hash_indirect
2032 || h
->root
.type
== bfd_link_hash_warning
)
2033 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2037 /* A local symbol. */
2038 Elf_Internal_Sym
*isym
;
2040 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2043 /* Check relocation against local STT_GNU_IFUNC symbol. */
2045 && ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2047 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2055 struct elf_i386_link_hash_entry
*eh
;
2056 struct elf_dyn_relocs
**pp
;
2057 struct elf_dyn_relocs
*p
;
2059 eh
= (struct elf_i386_link_hash_entry
*) h
;
2060 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2063 /* Everything must go for SEC. */
2069 r_type
= ELF32_R_TYPE (rel
->r_info
);
2070 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
2071 symtab_hdr
, sym_hashes
,
2072 &r_type
, GOT_UNKNOWN
,
2073 rel
, relend
, h
, r_symndx
))
2079 if (htab
->tls_ldm_got
.refcount
> 0)
2080 htab
->tls_ldm_got
.refcount
-= 1;
2084 case R_386_TLS_GOTDESC
:
2085 case R_386_TLS_DESC_CALL
:
2086 case R_386_TLS_IE_32
:
2088 case R_386_TLS_GOTIE
:
2093 if (h
->got
.refcount
> 0)
2094 h
->got
.refcount
-= 1;
2095 if (h
->type
== STT_GNU_IFUNC
)
2097 if (h
->plt
.refcount
> 0)
2098 h
->plt
.refcount
-= 1;
2101 else if (local_got_refcounts
!= NULL
)
2103 if (local_got_refcounts
[r_symndx
] > 0)
2104 local_got_refcounts
[r_symndx
] -= 1;
2111 if (bfd_link_pic (info
)
2112 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2119 if (h
->plt
.refcount
> 0)
2120 h
->plt
.refcount
-= 1;
2121 if (r_type
== R_386_32
2122 && (sec
->flags
& SEC_READONLY
) == 0)
2124 struct elf_i386_link_hash_entry
*eh
2125 = (struct elf_i386_link_hash_entry
*) h
;
2126 if (eh
->func_pointer_refcount
> 0)
2127 eh
->func_pointer_refcount
-= 1;
2133 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
2135 if (h
->got
.refcount
> 0)
2136 h
->got
.refcount
-= 1;
2137 if (h
->plt
.refcount
> 0)
2138 h
->plt
.refcount
-= 1;
2150 /* Adjust a symbol defined by a dynamic object and referenced by a
2151 regular object. The current definition is in some section of the
2152 dynamic object, but we're not including those sections. We have to
2153 change the definition to something the rest of the link can
2157 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2158 struct elf_link_hash_entry
*h
)
2160 struct elf_i386_link_hash_table
*htab
;
2162 struct elf_i386_link_hash_entry
*eh
;
2163 struct elf_dyn_relocs
*p
;
2165 /* STT_GNU_IFUNC symbol must go through PLT. */
2166 if (h
->type
== STT_GNU_IFUNC
)
2168 /* All local STT_GNU_IFUNC references must be treate as local
2169 calls via local PLT. */
2171 && SYMBOL_CALLS_LOCAL (info
, h
))
2173 bfd_size_type pc_count
= 0, count
= 0;
2174 struct elf_dyn_relocs
**pp
;
2176 eh
= (struct elf_i386_link_hash_entry
*) h
;
2177 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2179 pc_count
+= p
->pc_count
;
2180 p
->count
-= p
->pc_count
;
2189 if (pc_count
|| count
)
2193 if (h
->plt
.refcount
<= 0)
2194 h
->plt
.refcount
= 1;
2196 h
->plt
.refcount
+= 1;
2200 if (h
->plt
.refcount
<= 0)
2202 h
->plt
.offset
= (bfd_vma
) -1;
2208 /* If this is a function, put it in the procedure linkage table. We
2209 will fill in the contents of the procedure linkage table later,
2210 when we know the address of the .got section. */
2211 if (h
->type
== STT_FUNC
2214 if (h
->plt
.refcount
<= 0
2215 || SYMBOL_CALLS_LOCAL (info
, h
)
2216 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2217 && h
->root
.type
== bfd_link_hash_undefweak
))
2219 /* This case can occur if we saw a PLT32 reloc in an input
2220 file, but the symbol was never referred to by a dynamic
2221 object, or if all references were garbage collected. In
2222 such a case, we don't actually need to build a procedure
2223 linkage table, and we can just do a PC32 reloc instead. */
2224 h
->plt
.offset
= (bfd_vma
) -1;
2231 /* It's possible that we incorrectly decided a .plt reloc was
2232 needed for an R_386_PC32 reloc to a non-function sym in
2233 check_relocs. We can't decide accurately between function and
2234 non-function syms in check-relocs; Objects loaded later in
2235 the link may change h->type. So fix it now. */
2236 h
->plt
.offset
= (bfd_vma
) -1;
2238 /* If this is a weak symbol, and there is a real definition, the
2239 processor independent code will have arranged for us to see the
2240 real definition first, and we can just use the same value. */
2241 if (h
->u
.weakdef
!= NULL
)
2243 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2244 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2245 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2246 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2247 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2248 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2252 /* This is a reference to a symbol defined by a dynamic object which
2253 is not a function. */
2255 /* If we are creating a shared library, we must presume that the
2256 only references to the symbol are via the global offset table.
2257 For such cases we need not do anything here; the relocations will
2258 be handled correctly by relocate_section. */
2259 if (!bfd_link_executable (info
))
2262 /* If there are no references to this symbol that do not use the
2263 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2265 eh
= (struct elf_i386_link_hash_entry
*) h
;
2266 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
2269 /* If -z nocopyreloc was given, we won't generate them either. */
2270 if (info
->nocopyreloc
)
2276 htab
= elf_i386_hash_table (info
);
2280 /* If there aren't any dynamic relocs in read-only sections nor
2281 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2282 avoid the copy reloc. This doesn't work on VxWorks, where we can
2283 not have dynamic relocations (other than copy and jump slot
2284 relocations) in an executable. */
2285 if (ELIMINATE_COPY_RELOCS
2287 && !get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
)
2289 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2291 s
= p
->sec
->output_section
;
2292 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2303 /* We must allocate the symbol in our .dynbss section, which will
2304 become part of the .bss section of the executable. There will be
2305 an entry for this symbol in the .dynsym section. The dynamic
2306 object will contain position independent code, so all references
2307 from the dynamic object to this symbol will go through the global
2308 offset table. The dynamic linker will use the .dynsym entry to
2309 determine the address it must put in the global offset table, so
2310 both the dynamic object and the regular object will refer to the
2311 same memory location for the variable. */
2313 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2314 copy the initial value out of the dynamic object and into the
2315 runtime process image. */
2316 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2318 htab
->srelbss
->size
+= sizeof (Elf32_External_Rel
);
2324 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2327 /* Allocate space in .plt, .got and associated reloc sections for
2331 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2333 struct bfd_link_info
*info
;
2334 struct elf_i386_link_hash_table
*htab
;
2335 struct elf_i386_link_hash_entry
*eh
;
2336 struct elf_dyn_relocs
*p
;
2337 unsigned plt_entry_size
;
2339 if (h
->root
.type
== bfd_link_hash_indirect
)
2342 eh
= (struct elf_i386_link_hash_entry
*) h
;
2344 info
= (struct bfd_link_info
*) inf
;
2345 htab
= elf_i386_hash_table (info
);
2349 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2351 /* Clear the reference count of function pointer relocations if
2352 symbol isn't a normal function. */
2353 if (h
->type
!= STT_FUNC
)
2354 eh
->func_pointer_refcount
= 0;
2356 /* We can't use the GOT PLT if pointer equality is needed since
2357 finish_dynamic_symbol won't clear symbol value and the dynamic
2358 linker won't update the GOT slot. We will get into an infinite
2359 loop at run-time. */
2360 if (htab
->plt_got
!= NULL
2361 && h
->type
!= STT_GNU_IFUNC
2362 && !h
->pointer_equality_needed
2363 && h
->plt
.refcount
> 0
2364 && h
->got
.refcount
> 0)
2366 /* Don't use the regular PLT if there are both GOT and GOTPLT
2368 h
->plt
.offset
= (bfd_vma
) -1;
2370 /* Use the GOT PLT. */
2371 eh
->plt_got
.refcount
= 1;
2374 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2375 here if it is defined and referenced in a non-shared object. */
2376 if (h
->type
== STT_GNU_IFUNC
2378 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
, &eh
->dyn_relocs
,
2381 /* Don't create the PLT entry if there are only function pointer
2382 relocations which can be resolved at run-time. */
2383 else if (htab
->elf
.dynamic_sections_created
2384 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2385 || eh
->plt_got
.refcount
> 0))
2387 bfd_boolean use_plt_got
;
2389 /* Clear the reference count of function pointer relocations
2391 eh
->func_pointer_refcount
= 0;
2393 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2395 /* Don't use the regular PLT for DF_BIND_NOW. */
2396 h
->plt
.offset
= (bfd_vma
) -1;
2398 /* Use the GOT PLT. */
2399 h
->got
.refcount
= 1;
2400 eh
->plt_got
.refcount
= 1;
2403 use_plt_got
= eh
->plt_got
.refcount
> 0;
2405 /* Make sure this symbol is output as a dynamic symbol.
2406 Undefined weak syms won't yet be marked as dynamic. */
2407 if (h
->dynindx
== -1
2408 && !h
->forced_local
)
2410 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2414 if (bfd_link_pic (info
)
2415 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2417 asection
*s
= htab
->elf
.splt
;
2418 asection
*got_s
= htab
->plt_got
;
2420 /* If this is the first .plt entry, make room for the special
2421 first entry. The .plt section is used by prelink to undo
2422 prelinking for dynamic relocations. */
2424 s
->size
= plt_entry_size
;
2427 eh
->plt_got
.offset
= got_s
->size
;
2429 h
->plt
.offset
= s
->size
;
2431 /* If this symbol is not defined in a regular file, and we are
2432 not generating a shared library, then set the symbol to this
2433 location in the .plt. This is required to make function
2434 pointers compare as equal between the normal executable and
2435 the shared library. */
2436 if (! bfd_link_pic (info
)
2441 /* We need to make a call to the entry of the GOT PLT
2442 instead of regular PLT entry. */
2443 h
->root
.u
.def
.section
= got_s
;
2444 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2448 h
->root
.u
.def
.section
= s
;
2449 h
->root
.u
.def
.value
= h
->plt
.offset
;
2453 /* Make room for this entry. */
2455 got_s
->size
+= sizeof (elf_i386_got_plt_entry
);
2458 s
->size
+= plt_entry_size
;
2460 /* We also need to make an entry in the .got.plt section,
2461 which will be placed in the .got section by the linker
2463 htab
->elf
.sgotplt
->size
+= 4;
2465 /* We also need to make an entry in the .rel.plt section. */
2466 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2467 htab
->elf
.srelplt
->reloc_count
++;
2470 if (get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
2471 && !bfd_link_pic (info
))
2473 /* VxWorks has a second set of relocations for each PLT entry
2474 in executables. They go in a separate relocation section,
2475 which is processed by the kernel loader. */
2477 /* There are two relocations for the initial PLT entry: an
2478 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2479 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2481 if (h
->plt
.offset
== plt_entry_size
)
2482 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2484 /* There are two extra relocations for each subsequent PLT entry:
2485 an R_386_32 relocation for the GOT entry, and an R_386_32
2486 relocation for the PLT entry. */
2488 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2493 h
->plt
.offset
= (bfd_vma
) -1;
2499 h
->plt
.offset
= (bfd_vma
) -1;
2503 eh
->tlsdesc_got
= (bfd_vma
) -1;
2505 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2506 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2507 if (h
->got
.refcount
> 0
2508 && bfd_link_executable (info
)
2510 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
2511 h
->got
.offset
= (bfd_vma
) -1;
2512 else if (h
->got
.refcount
> 0)
2516 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2518 /* Make sure this symbol is output as a dynamic symbol.
2519 Undefined weak syms won't yet be marked as dynamic. */
2520 if (h
->dynindx
== -1
2521 && !h
->forced_local
)
2523 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2528 if (GOT_TLS_GDESC_P (tls_type
))
2530 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2531 - elf_i386_compute_jump_table_size (htab
);
2532 htab
->elf
.sgotplt
->size
+= 8;
2533 h
->got
.offset
= (bfd_vma
) -2;
2535 if (! GOT_TLS_GDESC_P (tls_type
)
2536 || GOT_TLS_GD_P (tls_type
))
2538 h
->got
.offset
= s
->size
;
2540 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2541 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
2544 dyn
= htab
->elf
.dynamic_sections_created
;
2545 /* R_386_TLS_IE_32 needs one dynamic relocation,
2546 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2547 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2548 need two), R_386_TLS_GD needs one if local symbol and two if
2550 if (tls_type
== GOT_TLS_IE_BOTH
)
2551 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2552 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2553 || (tls_type
& GOT_TLS_IE
))
2554 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2555 else if (GOT_TLS_GD_P (tls_type
))
2556 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2557 else if (! GOT_TLS_GDESC_P (tls_type
)
2558 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2559 || h
->root
.type
!= bfd_link_hash_undefweak
)
2560 && (bfd_link_pic (info
)
2561 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2562 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2563 if (GOT_TLS_GDESC_P (tls_type
))
2564 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2567 h
->got
.offset
= (bfd_vma
) -1;
2569 if (eh
->dyn_relocs
== NULL
)
2572 /* In the shared -Bsymbolic case, discard space allocated for
2573 dynamic pc-relative relocs against symbols which turn out to be
2574 defined in regular objects. For the normal shared case, discard
2575 space for pc-relative relocs that have become local due to symbol
2576 visibility changes. */
2578 if (bfd_link_pic (info
))
2580 /* The only reloc that uses pc_count is R_386_PC32, which will
2581 appear on a call or on something like ".long foo - .". We
2582 want calls to protected symbols to resolve directly to the
2583 function rather than going via the plt. If people want
2584 function pointer comparisons to work as expected then they
2585 should avoid writing assembly like ".long foo - .". */
2586 if (SYMBOL_CALLS_LOCAL (info
, h
))
2588 struct elf_dyn_relocs
**pp
;
2590 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2592 p
->count
-= p
->pc_count
;
2601 if (get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
)
2603 struct elf_dyn_relocs
**pp
;
2604 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2606 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
2613 /* Also discard relocs on undefined weak syms with non-default
2615 if (eh
->dyn_relocs
!= NULL
2616 && h
->root
.type
== bfd_link_hash_undefweak
)
2618 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2619 eh
->dyn_relocs
= NULL
;
2621 /* Make sure undefined weak symbols are output as a dynamic
2623 else if (h
->dynindx
== -1
2624 && !h
->forced_local
)
2626 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2631 else if (ELIMINATE_COPY_RELOCS
)
2633 /* For the non-shared case, discard space for relocs against
2634 symbols which turn out to need copy relocs or are not
2635 dynamic. Keep dynamic relocations for run-time function
2636 pointer initialization. */
2638 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2641 || (htab
->elf
.dynamic_sections_created
2642 && (h
->root
.type
== bfd_link_hash_undefweak
2643 || h
->root
.type
== bfd_link_hash_undefined
))))
2645 /* Make sure this symbol is output as a dynamic symbol.
2646 Undefined weak syms won't yet be marked as dynamic. */
2647 if (h
->dynindx
== -1
2648 && !h
->forced_local
)
2650 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2654 /* If that succeeded, we know we'll be keeping all the
2656 if (h
->dynindx
!= -1)
2660 eh
->dyn_relocs
= NULL
;
2661 eh
->func_pointer_refcount
= 0;
2666 /* Finally, allocate space. */
2667 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2671 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2673 BFD_ASSERT (sreloc
!= NULL
);
2674 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2680 /* Allocate space in .plt, .got and associated reloc sections for
2681 local dynamic relocs. */
2684 elf_i386_allocate_local_dynrelocs (void **slot
, void *inf
)
2686 struct elf_link_hash_entry
*h
2687 = (struct elf_link_hash_entry
*) *slot
;
2689 if (h
->type
!= STT_GNU_IFUNC
2693 || h
->root
.type
!= bfd_link_hash_defined
)
2696 return elf_i386_allocate_dynrelocs (h
, inf
);
2699 /* Find any dynamic relocs that apply to read-only sections. */
2702 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2704 struct elf_i386_link_hash_entry
*eh
;
2705 struct elf_dyn_relocs
*p
;
2707 /* Skip local IFUNC symbols. */
2708 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2711 eh
= (struct elf_i386_link_hash_entry
*) h
;
2712 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2714 asection
*s
= p
->sec
->output_section
;
2716 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2718 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2720 info
->flags
|= DF_TEXTREL
;
2722 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2723 || info
->error_textrel
)
2724 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2725 p
->sec
->owner
, h
->root
.root
.string
,
2728 /* Not an error, just cut short the traversal. */
2735 /* With the local symbol, foo, we convert
2736 mov foo@GOT[(%reg1)], %reg2
2738 lea foo[@GOTOFF(%reg1)], %reg2
2740 call/jmp *foo@GOT[(%reg)]
2742 nop call foo/jmp foo nop
2743 When PIC is false, convert
2744 test %reg1, foo@GOT[(%reg2)]
2748 binop foo@GOT[(%reg1)], %reg2
2751 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2755 elf_i386_convert_load (bfd
*abfd
, asection
*sec
,
2756 struct bfd_link_info
*link_info
)
2758 Elf_Internal_Shdr
*symtab_hdr
;
2759 Elf_Internal_Rela
*internal_relocs
;
2760 Elf_Internal_Rela
*irel
, *irelend
;
2762 struct elf_i386_link_hash_table
*htab
;
2763 bfd_boolean changed_contents
;
2764 bfd_boolean changed_relocs
;
2765 bfd_signed_vma
*local_got_refcounts
;
2767 /* Don't even try to convert non-ELF outputs. */
2768 if (!is_elf_hash_table (link_info
->hash
))
2771 /* Nothing to do if there is no need or no output. */
2772 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
2773 || sec
->need_convert_load
== 0
2774 || bfd_is_abs_section (sec
->output_section
))
2777 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2779 /* Load the relocations for this section. */
2780 internal_relocs
= (_bfd_elf_link_read_relocs
2781 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
2782 link_info
->keep_memory
));
2783 if (internal_relocs
== NULL
)
2786 htab
= elf_i386_hash_table (link_info
);
2787 changed_contents
= FALSE
;
2788 changed_relocs
= FALSE
;
2789 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2791 /* Get the section contents. */
2792 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2793 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2796 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2800 irelend
= internal_relocs
+ sec
->reloc_count
;
2801 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
2803 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
2804 unsigned int r_symndx
= ELF32_R_SYM (irel
->r_info
);
2806 struct elf_link_hash_entry
*h
;
2807 unsigned int opcode
;
2810 bfd_boolean baseless
;
2811 Elf_Internal_Sym
*isym
;
2812 unsigned int addend
;
2816 if (r_type
!= R_386_GOT32
&& r_type
!= R_386_GOT32X
)
2819 roff
= irel
->r_offset
;
2823 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2824 baseless
= (modrm
& 0xc7) == 0x5;
2826 if (r_type
== R_386_GOT32X
2828 && bfd_link_pic (link_info
))
2830 /* For PIC, disallow R_386_GOT32X without a base register
2831 since we don't know what the GOT base is. Allow
2832 R_386_GOT32 for existing object files. */
2835 if (r_symndx
< symtab_hdr
->sh_info
)
2837 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
, abfd
,
2839 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
2843 indx
= r_symndx
- symtab_hdr
->sh_info
;
2844 h
= elf_sym_hashes (abfd
)[indx
];
2845 BFD_ASSERT (h
!= NULL
);
2846 name
= h
->root
.root
.string
;
2849 (*_bfd_error_handler
)
2850 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2855 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
2857 /* It is OK to convert mov to lea. */
2860 /* Only convert R_386_GOT32X relocation for call, jmp or
2861 one of adc, add, and, cmp, or, sbb, sub, test, xor
2863 if (r_type
!= R_386_GOT32X
)
2866 /* It is OK to convert indirect branch to direct branch. It
2867 is OK to convert adc, add, and, cmp, or, sbb, sub, test,
2868 xor only when PIC is false. */
2869 if (opcode
!= 0xff && bfd_link_pic (link_info
))
2873 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2874 referred to by the reloc. */
2875 if (r_symndx
< symtab_hdr
->sh_info
)
2877 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2880 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2881 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2885 if (opcode
== 0x0ff)
2886 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2887 goto convert_branch
;
2889 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2890 "test %reg1, foo@GOT(%reg2)" and
2891 "binop foo@GOT[(%reg1)], %reg2". */
2895 indx
= r_symndx
- symtab_hdr
->sh_info
;
2896 h
= elf_sym_hashes (abfd
)[indx
];
2897 BFD_ASSERT (h
!= NULL
);
2899 while (h
->root
.type
== bfd_link_hash_indirect
2900 || h
->root
.type
== bfd_link_hash_warning
)
2901 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2903 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2904 if (h
->type
== STT_GNU_IFUNC
)
2909 /* We have "call/jmp *foo@GOT[(%reg)]". */
2910 if ((h
->root
.type
== bfd_link_hash_defined
2911 || h
->root
.type
== bfd_link_hash_defweak
)
2912 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
2914 /* The function is locally defined. */
2916 addend
= bfd_get_32 (abfd
, contents
+ roff
);
2917 /* Addend for R_386_GOT32X relocation must be 0. */
2921 /* Convert R_386_GOT32X to R_386_PC32. */
2922 if (modrm
== 0x15 || (modrm
& 0xf8) == 0x90)
2924 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2927 nop
= ADDR_PREFIX_OPCODE
;
2928 nop_offset
= roff
- 2;
2932 /* Convert to "jmp foo nop". */
2935 nop_offset
= roff
+ 3;
2936 irel
->r_offset
-= 1;
2939 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
2940 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
2941 /* When converting to PC-relative relocation, we
2942 need to adjust addend by -4. */
2943 bfd_put_32 (abfd
, -4, contents
+ irel
->r_offset
);
2944 irel
->r_info
= ELF32_R_INFO (r_symndx
, R_386_PC32
);
2948 if (h
->got
.refcount
> 0)
2949 h
->got
.refcount
-= 1;
2953 if (local_got_refcounts
!= NULL
2954 && local_got_refcounts
[r_symndx
] > 0)
2955 local_got_refcounts
[r_symndx
] -= 1;
2958 changed_contents
= TRUE
;
2959 changed_relocs
= TRUE
;
2964 /* We have "mov foo@GOT[(%re1g)], %reg2",
2965 "test %reg1, foo@GOT(%reg2)" and
2966 "binop foo@GOT[(%reg1)], %reg2".
2968 Avoid optimizing _DYNAMIC since ld.so may use its
2969 link-time address. */
2970 if (h
== htab
->elf
.hdynamic
)
2973 if ((h
->root
.type
== bfd_link_hash_defined
2974 || h
->root
.type
== bfd_link_hash_defweak
)
2975 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
2980 /* Convert "mov foo@GOT(%reg1), %reg2" to
2981 "lea foo@GOTOFF(%reg1), %reg2". */
2982 if (r_type
== R_386_GOT32X
2983 && (baseless
|| !bfd_link_pic (link_info
)))
2986 /* For R_386_32, convert
2987 "lea foo@GOTOFF(%reg1), %reg2" to
2988 "lea foo@GOT, %reg2". */
2991 modrm
= 0x5 | (modrm
& 0x38);
2992 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
2996 r_type
= R_386_GOTOFF
;
3001 /* Addend for R_386_GOT32X relocation must be 0. */
3002 addend
= bfd_get_32 (abfd
, contents
+ roff
);
3008 /* Convert "test %reg1, foo@GOT(%reg2)" to
3009 "test $foo, %reg1". */
3010 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3015 /* Convert "binop foo@GOT(%reg1), %reg2" to
3016 "binop $foo, %reg2". */
3018 | (modrm
& 0x38) >> 3
3022 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3026 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3027 irel
->r_info
= ELF32_R_INFO (r_symndx
, r_type
);
3031 if (h
->got
.refcount
> 0)
3032 h
->got
.refcount
-= 1;
3036 if (local_got_refcounts
!= NULL
3037 && local_got_refcounts
[r_symndx
] > 0)
3038 local_got_refcounts
[r_symndx
] -= 1;
3041 changed_contents
= TRUE
;
3042 changed_relocs
= TRUE
;
3047 if (contents
!= NULL
3048 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3050 if (!changed_contents
&& !link_info
->keep_memory
)
3054 /* Cache the section contents for elf_link_input_bfd. */
3055 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3059 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3061 if (!changed_relocs
)
3062 free (internal_relocs
);
3064 elf_section_data (sec
)->relocs
= internal_relocs
;
3070 if (contents
!= NULL
3071 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3073 if (internal_relocs
!= NULL
3074 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3075 free (internal_relocs
);
3079 /* Set the sizes of the dynamic sections. */
3082 elf_i386_size_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3084 struct elf_i386_link_hash_table
*htab
;
3090 htab
= elf_i386_hash_table (info
);
3093 dynobj
= htab
->elf
.dynobj
;
3097 if (htab
->elf
.dynamic_sections_created
)
3099 /* Set the contents of the .interp section to the interpreter. */
3100 if (bfd_link_executable (info
) && !info
->nointerp
)
3102 s
= bfd_get_linker_section (dynobj
, ".interp");
3105 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
3106 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
3110 /* Set up .got offsets for local syms, and space for local dynamic
3112 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3114 bfd_signed_vma
*local_got
;
3115 bfd_signed_vma
*end_local_got
;
3116 char *local_tls_type
;
3117 bfd_vma
*local_tlsdesc_gotent
;
3118 bfd_size_type locsymcount
;
3119 Elf_Internal_Shdr
*symtab_hdr
;
3122 if (! is_i386_elf (ibfd
))
3125 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3127 struct elf_dyn_relocs
*p
;
3129 if (!elf_i386_convert_load (ibfd
, s
, info
))
3132 for (p
= ((struct elf_dyn_relocs
*)
3133 elf_section_data (s
)->local_dynrel
);
3137 if (!bfd_is_abs_section (p
->sec
)
3138 && bfd_is_abs_section (p
->sec
->output_section
))
3140 /* Input section has been discarded, either because
3141 it is a copy of a linkonce section or due to
3142 linker script /DISCARD/, so we'll be discarding
3145 else if (get_elf_i386_backend_data (output_bfd
)->is_vxworks
3146 && strcmp (p
->sec
->output_section
->name
,
3149 /* Relocations in vxworks .tls_vars sections are
3150 handled specially by the loader. */
3152 else if (p
->count
!= 0)
3154 srel
= elf_section_data (p
->sec
)->sreloc
;
3155 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
3156 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3157 && (info
->flags
& DF_TEXTREL
) == 0)
3159 info
->flags
|= DF_TEXTREL
;
3160 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3161 || info
->error_textrel
)
3162 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3163 p
->sec
->owner
, p
->sec
);
3169 local_got
= elf_local_got_refcounts (ibfd
);
3173 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3174 locsymcount
= symtab_hdr
->sh_info
;
3175 end_local_got
= local_got
+ locsymcount
;
3176 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
3177 local_tlsdesc_gotent
= elf_i386_local_tlsdesc_gotent (ibfd
);
3179 srel
= htab
->elf
.srelgot
;
3180 for (; local_got
< end_local_got
;
3181 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3183 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3186 if (GOT_TLS_GDESC_P (*local_tls_type
))
3188 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3189 - elf_i386_compute_jump_table_size (htab
);
3190 htab
->elf
.sgotplt
->size
+= 8;
3191 *local_got
= (bfd_vma
) -2;
3193 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3194 || GOT_TLS_GD_P (*local_tls_type
))
3196 *local_got
= s
->size
;
3198 if (GOT_TLS_GD_P (*local_tls_type
)
3199 || *local_tls_type
== GOT_TLS_IE_BOTH
)
3202 if (bfd_link_pic (info
)
3203 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3204 || (*local_tls_type
& GOT_TLS_IE
))
3206 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
3207 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
3208 else if (GOT_TLS_GD_P (*local_tls_type
)
3209 || ! GOT_TLS_GDESC_P (*local_tls_type
))
3210 srel
->size
+= sizeof (Elf32_External_Rel
);
3211 if (GOT_TLS_GDESC_P (*local_tls_type
))
3212 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
3216 *local_got
= (bfd_vma
) -1;
3220 if (htab
->tls_ldm_got
.refcount
> 0)
3222 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3224 htab
->tls_ldm_got
.offset
= htab
->elf
.sgot
->size
;
3225 htab
->elf
.sgot
->size
+= 8;
3226 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
3229 htab
->tls_ldm_got
.offset
= -1;
3231 /* Allocate global sym .plt and .got entries, and space for global
3232 sym dynamic relocs. */
3233 elf_link_hash_traverse (&htab
->elf
, elf_i386_allocate_dynrelocs
, info
);
3235 /* Allocate .plt and .got entries, and space for local symbols. */
3236 htab_traverse (htab
->loc_hash_table
,
3237 elf_i386_allocate_local_dynrelocs
,
3240 /* For every jump slot reserved in the sgotplt, reloc_count is
3241 incremented. However, when we reserve space for TLS descriptors,
3242 it's not incremented, so in order to compute the space reserved
3243 for them, it suffices to multiply the reloc count by the jump
3246 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3247 so that R_386_IRELATIVE entries come last. */
3248 if (htab
->elf
.srelplt
)
3250 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
3251 htab
->sgotplt_jump_table_size
= htab
->next_tls_desc_index
* 4;
3252 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3254 else if (htab
->elf
.irelplt
)
3255 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3258 if (htab
->elf
.sgotplt
)
3260 /* Don't allocate .got.plt section if there are no GOT nor PLT
3261 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3262 if ((htab
->elf
.hgot
== NULL
3263 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3264 && (htab
->elf
.sgotplt
->size
3265 == get_elf_backend_data (output_bfd
)->got_header_size
)
3266 && (htab
->elf
.splt
== NULL
3267 || htab
->elf
.splt
->size
== 0)
3268 && (htab
->elf
.sgot
== NULL
3269 || htab
->elf
.sgot
->size
== 0)
3270 && (htab
->elf
.iplt
== NULL
3271 || htab
->elf
.iplt
->size
== 0)
3272 && (htab
->elf
.igotplt
== NULL
3273 || htab
->elf
.igotplt
->size
== 0))
3274 htab
->elf
.sgotplt
->size
= 0;
3278 if (htab
->plt_eh_frame
!= NULL
3279 && htab
->elf
.splt
!= NULL
3280 && htab
->elf
.splt
->size
!= 0
3281 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3282 && _bfd_elf_eh_frame_present (info
))
3283 htab
->plt_eh_frame
->size
= sizeof (elf_i386_eh_frame_plt
);
3285 /* We now have determined the sizes of the various dynamic sections.
3286 Allocate memory for them. */
3288 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3290 bfd_boolean strip_section
= TRUE
;
3292 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3295 if (s
== htab
->elf
.splt
3296 || s
== htab
->elf
.sgot
)
3298 /* Strip this section if we don't need it; see the
3300 /* We'd like to strip these sections if they aren't needed, but if
3301 we've exported dynamic symbols from them we must leave them.
3302 It's too late to tell BFD to get rid of the symbols. */
3304 if (htab
->elf
.hplt
!= NULL
)
3305 strip_section
= FALSE
;
3307 else if (s
== htab
->elf
.sgotplt
3308 || s
== htab
->elf
.iplt
3309 || s
== htab
->elf
.igotplt
3310 || s
== htab
->plt_got
3311 || s
== htab
->plt_eh_frame
3312 || s
== htab
->sdynbss
)
3314 /* Strip these too. */
3316 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rel"))
3319 && s
!= htab
->elf
.srelplt
3320 && s
!= htab
->srelplt2
)
3323 /* We use the reloc_count field as a counter if we need
3324 to copy relocs into the output file. */
3329 /* It's not one of our sections, so don't allocate space. */
3335 /* If we don't need this section, strip it from the
3336 output file. This is mostly to handle .rel.bss and
3337 .rel.plt. We must create both sections in
3338 create_dynamic_sections, because they must be created
3339 before the linker maps input sections to output
3340 sections. The linker does that before
3341 adjust_dynamic_symbol is called, and it is that
3342 function which decides whether anything needs to go
3343 into these sections. */
3345 s
->flags
|= SEC_EXCLUDE
;
3349 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3352 /* Allocate memory for the section contents. We use bfd_zalloc
3353 here in case unused entries are not reclaimed before the
3354 section's contents are written out. This should not happen,
3355 but this way if it does, we get a R_386_NONE reloc instead
3357 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
3358 if (s
->contents
== NULL
)
3362 if (htab
->plt_eh_frame
!= NULL
3363 && htab
->plt_eh_frame
->contents
!= NULL
)
3365 memcpy (htab
->plt_eh_frame
->contents
, elf_i386_eh_frame_plt
,
3366 sizeof (elf_i386_eh_frame_plt
));
3367 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3368 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3371 if (htab
->elf
.dynamic_sections_created
)
3373 /* Add some entries to the .dynamic section. We fill in the
3374 values later, in elf_i386_finish_dynamic_sections, but we
3375 must add the entries now so that we get the correct size for
3376 the .dynamic section. The DT_DEBUG entry is filled in by the
3377 dynamic linker and used by the debugger. */
3378 #define add_dynamic_entry(TAG, VAL) \
3379 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3381 if (bfd_link_executable (info
))
3383 if (!add_dynamic_entry (DT_DEBUG
, 0))
3387 if (htab
->elf
.splt
->size
!= 0)
3389 /* DT_PLTGOT is used by prelink even if there is no PLT
3391 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3394 if (htab
->elf
.srelplt
->size
!= 0)
3396 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3397 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3398 || !add_dynamic_entry (DT_JMPREL
, 0))
3405 if (!add_dynamic_entry (DT_REL
, 0)
3406 || !add_dynamic_entry (DT_RELSZ
, 0)
3407 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3410 /* If any dynamic relocs apply to a read-only section,
3411 then we need a DT_TEXTREL entry. */
3412 if ((info
->flags
& DF_TEXTREL
) == 0)
3413 elf_link_hash_traverse (&htab
->elf
,
3414 elf_i386_readonly_dynrelocs
, info
);
3416 if ((info
->flags
& DF_TEXTREL
) != 0)
3418 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3419 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3421 info
->callbacks
->einfo
3422 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3423 bfd_set_error (bfd_error_bad_value
);
3427 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3431 if (get_elf_i386_backend_data (output_bfd
)->is_vxworks
3432 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
3435 #undef add_dynamic_entry
3441 elf_i386_always_size_sections (bfd
*output_bfd
,
3442 struct bfd_link_info
*info
)
3444 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3448 struct elf_link_hash_entry
*tlsbase
;
3450 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3451 "_TLS_MODULE_BASE_",
3452 FALSE
, FALSE
, FALSE
);
3454 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3456 struct elf_i386_link_hash_table
*htab
;
3457 struct bfd_link_hash_entry
*bh
= NULL
;
3458 const struct elf_backend_data
*bed
3459 = get_elf_backend_data (output_bfd
);
3461 htab
= elf_i386_hash_table (info
);
3465 if (!(_bfd_generic_link_add_one_symbol
3466 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3467 tls_sec
, 0, NULL
, FALSE
,
3468 bed
->collect
, &bh
)))
3471 htab
->tls_module_base
= bh
;
3473 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3474 tlsbase
->def_regular
= 1;
3475 tlsbase
->other
= STV_HIDDEN
;
3476 tlsbase
->root
.linker_def
= 1;
3477 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3484 /* Set the correct type for an x86 ELF section. We do this by the
3485 section name, which is a hack, but ought to work. */
3488 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
3489 Elf_Internal_Shdr
*hdr
,
3494 name
= bfd_get_section_name (abfd
, sec
);
3496 /* This is an ugly, but unfortunately necessary hack that is
3497 needed when producing EFI binaries on x86. It tells
3498 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3499 containing ELF relocation info. We need this hack in order to
3500 be able to generate ELF binaries that can be translated into
3501 EFI applications (which are essentially COFF objects). Those
3502 files contain a COFF ".reloc" section inside an ELFNN object,
3503 which would normally cause BFD to segfault because it would
3504 attempt to interpret this section as containing relocation
3505 entries for section "oc". With this hack enabled, ".reloc"
3506 will be treated as a normal data section, which will avoid the
3507 segfault. However, you won't be able to create an ELFNN binary
3508 with a section named "oc" that needs relocations, but that's
3509 the kind of ugly side-effects you get when detecting section
3510 types based on their names... In practice, this limitation is
3511 unlikely to bite. */
3512 if (strcmp (name
, ".reloc") == 0)
3513 hdr
->sh_type
= SHT_PROGBITS
;
3518 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3519 executables. Rather than setting it to the beginning of the TLS
3520 section, we have to set it to the end. This function may be called
3521 multiple times, it is idempotent. */
3524 elf_i386_set_tls_module_base (struct bfd_link_info
*info
)
3526 struct elf_i386_link_hash_table
*htab
;
3527 struct bfd_link_hash_entry
*base
;
3529 if (!bfd_link_executable (info
))
3532 htab
= elf_i386_hash_table (info
);
3536 base
= htab
->tls_module_base
;
3540 base
->u
.def
.value
= htab
->elf
.tls_size
;
3543 /* Return the base VMA address which should be subtracted from real addresses
3544 when resolving @dtpoff relocation.
3545 This is PT_TLS segment p_vaddr. */
3548 elf_i386_dtpoff_base (struct bfd_link_info
*info
)
3550 /* If tls_sec is NULL, we should have signalled an error already. */
3551 if (elf_hash_table (info
)->tls_sec
== NULL
)
3553 return elf_hash_table (info
)->tls_sec
->vma
;
3556 /* Return the relocation value for @tpoff relocation
3557 if STT_TLS virtual address is ADDRESS. */
3560 elf_i386_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3562 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3563 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3564 bfd_vma static_tls_size
;
3566 /* If tls_sec is NULL, we should have signalled an error already. */
3567 if (htab
->tls_sec
== NULL
)
3570 /* Consider special static TLS alignment requirements. */
3571 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3572 return static_tls_size
+ htab
->tls_sec
->vma
- address
;
3575 /* Relocate an i386 ELF section. */
3578 elf_i386_relocate_section (bfd
*output_bfd
,
3579 struct bfd_link_info
*info
,
3581 asection
*input_section
,
3583 Elf_Internal_Rela
*relocs
,
3584 Elf_Internal_Sym
*local_syms
,
3585 asection
**local_sections
)
3587 struct elf_i386_link_hash_table
*htab
;
3588 Elf_Internal_Shdr
*symtab_hdr
;
3589 struct elf_link_hash_entry
**sym_hashes
;
3590 bfd_vma
*local_got_offsets
;
3591 bfd_vma
*local_tlsdesc_gotents
;
3592 Elf_Internal_Rela
*rel
;
3593 Elf_Internal_Rela
*relend
;
3594 bfd_boolean is_vxworks_tls
;
3595 unsigned plt_entry_size
;
3597 BFD_ASSERT (is_i386_elf (input_bfd
));
3599 htab
= elf_i386_hash_table (info
);
3602 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3603 sym_hashes
= elf_sym_hashes (input_bfd
);
3604 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3605 local_tlsdesc_gotents
= elf_i386_local_tlsdesc_gotent (input_bfd
);
3606 /* We have to handle relocations in vxworks .tls_vars sections
3607 specially, because the dynamic loader is 'weird'. */
3608 is_vxworks_tls
= (get_elf_i386_backend_data (output_bfd
)->is_vxworks
3609 && bfd_link_pic (info
)
3610 && !strcmp (input_section
->output_section
->name
,
3613 elf_i386_set_tls_module_base (info
);
3615 plt_entry_size
= GET_PLT_ENTRY_SIZE (output_bfd
);
3618 relend
= relocs
+ input_section
->reloc_count
;
3619 for (; rel
< relend
; rel
++)
3621 unsigned int r_type
;
3622 reloc_howto_type
*howto
;
3623 unsigned long r_symndx
;
3624 struct elf_link_hash_entry
*h
;
3625 struct elf_i386_link_hash_entry
*eh
;
3626 Elf_Internal_Sym
*sym
;
3628 bfd_vma off
, offplt
, plt_offset
;
3630 bfd_boolean unresolved_reloc
;
3631 bfd_reloc_status_type r
;
3635 asection
*resolved_plt
;
3637 r_type
= ELF32_R_TYPE (rel
->r_info
);
3638 if (r_type
== R_386_GNU_VTINHERIT
3639 || r_type
== R_386_GNU_VTENTRY
)
3642 if ((indx
= r_type
) >= R_386_standard
3643 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
3644 >= R_386_ext
- R_386_standard
)
3645 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
3646 >= R_386_ext2
- R_386_ext
))
3648 (*_bfd_error_handler
)
3649 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3650 input_bfd
, input_section
, r_type
);
3651 bfd_set_error (bfd_error_bad_value
);
3654 howto
= elf_howto_table
+ indx
;
3656 r_symndx
= ELF32_R_SYM (rel
->r_info
);
3660 unresolved_reloc
= FALSE
;
3661 if (r_symndx
< symtab_hdr
->sh_info
)
3663 sym
= local_syms
+ r_symndx
;
3664 sec
= local_sections
[r_symndx
];
3665 relocation
= (sec
->output_section
->vma
3666 + sec
->output_offset
3668 st_size
= sym
->st_size
;
3670 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
3671 && ((sec
->flags
& SEC_MERGE
) != 0
3672 || (bfd_link_relocatable (info
)
3673 && sec
->output_offset
!= 0)))
3676 bfd_byte
*where
= contents
+ rel
->r_offset
;
3678 switch (howto
->size
)
3681 addend
= bfd_get_8 (input_bfd
, where
);
3682 if (howto
->pc_relative
)
3684 addend
= (addend
^ 0x80) - 0x80;
3689 addend
= bfd_get_16 (input_bfd
, where
);
3690 if (howto
->pc_relative
)
3692 addend
= (addend
^ 0x8000) - 0x8000;
3697 addend
= bfd_get_32 (input_bfd
, where
);
3698 if (howto
->pc_relative
)
3700 addend
= (addend
^ 0x80000000) - 0x80000000;
3708 if (bfd_link_relocatable (info
))
3709 addend
+= sec
->output_offset
;
3712 asection
*msec
= sec
;
3713 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
3715 addend
-= relocation
;
3716 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
3719 switch (howto
->size
)
3722 /* FIXME: overflow checks. */
3723 if (howto
->pc_relative
)
3725 bfd_put_8 (input_bfd
, addend
, where
);
3728 if (howto
->pc_relative
)
3730 bfd_put_16 (input_bfd
, addend
, where
);
3733 if (howto
->pc_relative
)
3735 bfd_put_32 (input_bfd
, addend
, where
);
3739 else if (!bfd_link_relocatable (info
)
3740 && ELF32_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3742 /* Relocate against local STT_GNU_IFUNC symbol. */
3743 h
= elf_i386_get_local_sym_hash (htab
, input_bfd
, rel
,
3748 /* Set STT_GNU_IFUNC symbol value. */
3749 h
->root
.u
.def
.value
= sym
->st_value
;
3750 h
->root
.u
.def
.section
= sec
;
3755 bfd_boolean warned ATTRIBUTE_UNUSED
;
3756 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3758 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3759 r_symndx
, symtab_hdr
, sym_hashes
,
3761 unresolved_reloc
, warned
, ignored
);
3765 if (sec
!= NULL
&& discarded_section (sec
))
3766 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3767 rel
, 1, relend
, howto
, 0, contents
);
3769 if (bfd_link_relocatable (info
))
3772 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3773 it here if it is defined in a non-shared object. */
3775 && h
->type
== STT_GNU_IFUNC
3778 asection
*plt
, *gotplt
, *base_got
;
3782 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3784 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3785 sections because such sections are not SEC_ALLOC and
3786 thus ld.so will not process them. */
3787 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3791 else if (h
->plt
.offset
== (bfd_vma
) -1)
3794 /* STT_GNU_IFUNC symbol must go through PLT. */
3795 if (htab
->elf
.splt
!= NULL
)
3797 plt
= htab
->elf
.splt
;
3798 gotplt
= htab
->elf
.sgotplt
;
3802 plt
= htab
->elf
.iplt
;
3803 gotplt
= htab
->elf
.igotplt
;
3806 relocation
= (plt
->output_section
->vma
3807 + plt
->output_offset
+ h
->plt
.offset
);
3812 if (h
->root
.root
.string
)
3813 name
= h
->root
.root
.string
;
3815 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3817 (*_bfd_error_handler
)
3818 (_("%B: relocation %s against STT_GNU_IFUNC "
3819 "symbol `%s' isn't handled by %s"), input_bfd
,
3820 elf_howto_table
[r_type
].name
,
3821 name
, __FUNCTION__
);
3822 bfd_set_error (bfd_error_bad_value
);
3826 /* Generate dynamic relcoation only when there is a
3827 non-GOT reference in a shared object. */
3828 if (bfd_link_pic (info
) && h
->non_got_ref
)
3830 Elf_Internal_Rela outrel
;
3834 /* Need a dynamic relocation to get the real function
3836 offset
= _bfd_elf_section_offset (output_bfd
,
3840 if (offset
== (bfd_vma
) -1
3841 || offset
== (bfd_vma
) -2)
3844 outrel
.r_offset
= (input_section
->output_section
->vma
3845 + input_section
->output_offset
3848 if (h
->dynindx
== -1
3850 || bfd_link_executable (info
))
3852 /* This symbol is resolved locally. */
3853 outrel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
3854 bfd_put_32 (output_bfd
,
3855 (h
->root
.u
.def
.value
3856 + h
->root
.u
.def
.section
->output_section
->vma
3857 + h
->root
.u
.def
.section
->output_offset
),
3861 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
3863 sreloc
= htab
->elf
.irelifunc
;
3864 elf_append_rel (output_bfd
, sreloc
, &outrel
);
3866 /* If this reloc is against an external symbol, we
3867 do not want to fiddle with the addend. Otherwise,
3868 we need to include the symbol value so that it
3869 becomes an addend for the dynamic reloc. For an
3870 internal symbol, we have updated addend. */
3880 base_got
= htab
->elf
.sgot
;
3881 off
= h
->got
.offset
;
3883 if (base_got
== NULL
)
3886 if (off
== (bfd_vma
) -1)
3888 /* We can't use h->got.offset here to save state, or
3889 even just remember the offset, as finish_dynamic_symbol
3890 would use that as offset into .got. */
3892 if (htab
->elf
.splt
!= NULL
)
3894 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3895 off
= (plt_index
+ 3) * 4;
3896 base_got
= htab
->elf
.sgotplt
;
3900 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3901 off
= plt_index
* 4;
3902 base_got
= htab
->elf
.igotplt
;
3905 if (h
->dynindx
== -1
3909 /* This references the local defitionion. We must
3910 initialize this entry in the global offset table.
3911 Since the offset must always be a multiple of 8,
3912 we use the least significant bit to record
3913 whether we have initialized it already.
3915 When doing a dynamic link, we create a .rela.got
3916 relocation entry to initialize the value. This
3917 is done in the finish_dynamic_symbol routine. */
3922 bfd_put_32 (output_bfd
, relocation
,
3923 base_got
->contents
+ off
);
3930 /* Adjust for static executables. */
3931 if (htab
->elf
.splt
== NULL
)
3932 relocation
+= gotplt
->output_offset
;
3936 relocation
= (base_got
->output_section
->vma
3937 + base_got
->output_offset
+ off
3938 - gotplt
->output_section
->vma
3939 - gotplt
->output_offset
);
3940 /* Adjust for static executables. */
3941 if (htab
->elf
.splt
== NULL
)
3942 relocation
+= gotplt
->output_offset
;
3948 relocation
-= (gotplt
->output_section
->vma
3949 + gotplt
->output_offset
);
3954 eh
= (struct elf_i386_link_hash_entry
*) h
;
3958 /* Avoid optimizing _DYNAMIC since ld.so may use its
3959 link-time address. */
3960 if (h
== htab
->elf
.hdynamic
)
3963 if (bfd_link_pic (info
))
3965 /* It is OK to convert mov to lea and convert indirect
3966 branch to direct branch. It is OK to convert adc,
3967 add, and, cmp, or, sbb, sub, test, xor only when PIC
3969 unsigned int opcode
;
3970 opcode
= bfd_get_8 (abfd
, contents
+ rel
->r_offset
- 2);
3971 if (opcode
!= 0x8b && opcode
!= 0xff)
3975 /* Resolve "mov GOT[(%reg)], %reg",
3976 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
3977 and "binop foo@GOT[(%reg)], %reg". */
3979 || (h
->plt
.offset
== (bfd_vma
) -1
3980 && h
->got
.offset
== (bfd_vma
) -1)
3981 || htab
->elf
.sgotplt
== NULL
)
3984 offplt
= (htab
->elf
.sgotplt
->output_section
->vma
3985 + htab
->elf
.sgotplt
->output_offset
);
3987 /* It is relative to .got.plt section. */
3988 if (h
->got
.offset
!= (bfd_vma
) -1)
3989 /* Use GOT entry. */
3990 relocation
= (htab
->elf
.sgot
->output_section
->vma
3991 + htab
->elf
.sgot
->output_offset
3992 + h
->got
.offset
- offplt
);
3994 /* Use GOTPLT entry. */
3995 relocation
= (h
->plt
.offset
/ plt_entry_size
- 1 + 3) * 4;
3997 if (!bfd_link_pic (info
))
3999 /* If not PIC, add the .got.plt section address for
4000 baseless adressing. */
4002 modrm
= bfd_get_8 (abfd
, contents
+ rel
->r_offset
- 1);
4003 if ((modrm
& 0xc7) == 0x5)
4004 relocation
+= offplt
;
4007 unresolved_reloc
= FALSE
;
4012 /* Relocation is to the entry for this symbol in the global
4014 if (htab
->elf
.sgot
== NULL
)
4021 off
= h
->got
.offset
;
4022 dyn
= htab
->elf
.dynamic_sections_created
;
4023 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
,
4024 bfd_link_pic (info
),
4026 || (bfd_link_pic (info
)
4027 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4028 || (ELF_ST_VISIBILITY (h
->other
)
4029 && h
->root
.type
== bfd_link_hash_undefweak
))
4031 /* This is actually a static link, or it is a
4032 -Bsymbolic link and the symbol is defined
4033 locally, or the symbol was forced to be local
4034 because of a version file. We must initialize
4035 this entry in the global offset table. Since the
4036 offset must always be a multiple of 4, we use the
4037 least significant bit to record whether we have
4038 initialized it already.
4040 When doing a dynamic link, we create a .rel.got
4041 relocation entry to initialize the value. This
4042 is done in the finish_dynamic_symbol routine. */
4047 bfd_put_32 (output_bfd
, relocation
,
4048 htab
->elf
.sgot
->contents
+ off
);
4053 unresolved_reloc
= FALSE
;
4057 if (local_got_offsets
== NULL
)
4060 off
= local_got_offsets
[r_symndx
];
4062 /* The offset must always be a multiple of 4. We use
4063 the least significant bit to record whether we have
4064 already generated the necessary reloc. */
4069 bfd_put_32 (output_bfd
, relocation
,
4070 htab
->elf
.sgot
->contents
+ off
);
4072 if (bfd_link_pic (info
))
4075 Elf_Internal_Rela outrel
;
4077 s
= htab
->elf
.srelgot
;
4081 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4082 + htab
->elf
.sgot
->output_offset
4084 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4085 elf_append_rel (output_bfd
, s
, &outrel
);
4088 local_got_offsets
[r_symndx
] |= 1;
4092 if (off
>= (bfd_vma
) -2)
4095 relocation
= htab
->elf
.sgot
->output_section
->vma
4096 + htab
->elf
.sgot
->output_offset
+ off
4097 - htab
->elf
.sgotplt
->output_section
->vma
4098 - htab
->elf
.sgotplt
->output_offset
;
4102 /* Relocation is relative to the start of the global offset
4105 /* Check to make sure it isn't a protected function or data
4106 symbol for shared library since it may not be local when
4107 used as function address or with copy relocation. We also
4108 need to make sure that a symbol is referenced locally. */
4109 if (!bfd_link_executable (info
) && h
)
4111 if (!h
->def_regular
)
4115 switch (ELF_ST_VISIBILITY (h
->other
))
4118 v
= _("hidden symbol");
4121 v
= _("internal symbol");
4124 v
= _("protected symbol");
4131 (*_bfd_error_handler
)
4132 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4133 input_bfd
, v
, h
->root
.root
.string
);
4134 bfd_set_error (bfd_error_bad_value
);
4137 else if (!SYMBOL_REFERENCES_LOCAL (info
, h
)
4138 && (h
->type
== STT_FUNC
4139 || h
->type
== STT_OBJECT
)
4140 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4142 (*_bfd_error_handler
)
4143 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4145 h
->type
== STT_FUNC
? "function" : "data",
4146 h
->root
.root
.string
);
4147 bfd_set_error (bfd_error_bad_value
);
4152 /* Note that sgot is not involved in this
4153 calculation. We always want the start of .got.plt. If we
4154 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4155 permitted by the ABI, we might have to change this
4157 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4158 + htab
->elf
.sgotplt
->output_offset
;
4162 /* Use global offset table as symbol value. */
4163 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4164 + htab
->elf
.sgotplt
->output_offset
;
4165 unresolved_reloc
= FALSE
;
4169 /* Relocation is to the entry for this symbol in the
4170 procedure linkage table. */
4172 /* Resolve a PLT32 reloc against a local symbol directly,
4173 without using the procedure linkage table. */
4177 if ((h
->plt
.offset
== (bfd_vma
) -1
4178 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4179 || htab
->elf
.splt
== NULL
)
4181 /* We didn't make a PLT entry for this symbol. This
4182 happens when statically linking PIC code, or when
4183 using -Bsymbolic. */
4187 if (h
->plt
.offset
!= (bfd_vma
) -1)
4189 resolved_plt
= htab
->elf
.splt
;
4190 plt_offset
= h
->plt
.offset
;
4194 resolved_plt
= htab
->plt_got
;
4195 plt_offset
= eh
->plt_got
.offset
;
4198 relocation
= (resolved_plt
->output_section
->vma
4199 + resolved_plt
->output_offset
4201 unresolved_reloc
= FALSE
;
4205 /* Set to symbol size. */
4206 relocation
= st_size
;
4211 if ((input_section
->flags
& SEC_ALLOC
) == 0
4215 /* Copy dynamic function pointer relocations. */
4216 if ((bfd_link_pic (info
)
4218 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4219 || h
->root
.type
!= bfd_link_hash_undefweak
)
4220 && ((r_type
!= R_386_PC32
&& r_type
!= R_386_SIZE32
)
4221 || !SYMBOL_CALLS_LOCAL (info
, h
)))
4222 || (ELIMINATE_COPY_RELOCS
4223 && !bfd_link_pic (info
)
4226 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4229 || h
->root
.type
== bfd_link_hash_undefweak
4230 || h
->root
.type
== bfd_link_hash_undefined
)))
4232 Elf_Internal_Rela outrel
;
4233 bfd_boolean skip
, relocate
;
4236 /* When generating a shared object, these relocations
4237 are copied into the output file to be resolved at run
4244 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4246 if (outrel
.r_offset
== (bfd_vma
) -1)
4248 else if (outrel
.r_offset
== (bfd_vma
) -2)
4249 skip
= TRUE
, relocate
= TRUE
;
4250 outrel
.r_offset
+= (input_section
->output_section
->vma
4251 + input_section
->output_offset
);
4254 memset (&outrel
, 0, sizeof outrel
);
4257 && (r_type
== R_386_PC32
4258 || !bfd_link_pic (info
)
4259 || !SYMBOLIC_BIND (info
, h
)
4260 || !h
->def_regular
))
4261 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
4264 /* This symbol is local, or marked to become local. */
4266 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4269 sreloc
= elf_section_data (input_section
)->sreloc
;
4271 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4273 r
= bfd_reloc_notsupported
;
4274 goto check_relocation_error
;
4277 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4279 /* If this reloc is against an external symbol, we do
4280 not want to fiddle with the addend. Otherwise, we
4281 need to include the symbol value so that it becomes
4282 an addend for the dynamic reloc. */
4289 if (!bfd_link_executable (info
))
4291 Elf_Internal_Rela outrel
;
4294 outrel
.r_offset
= rel
->r_offset
4295 + input_section
->output_section
->vma
4296 + input_section
->output_offset
;
4297 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4298 sreloc
= elf_section_data (input_section
)->sreloc
;
4301 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4306 case R_386_TLS_GOTDESC
:
4307 case R_386_TLS_DESC_CALL
:
4308 case R_386_TLS_IE_32
:
4309 case R_386_TLS_GOTIE
:
4310 tls_type
= GOT_UNKNOWN
;
4311 if (h
== NULL
&& local_got_offsets
)
4312 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
4314 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
4315 if (tls_type
== GOT_TLS_IE
)
4316 tls_type
= GOT_TLS_IE_NEG
;
4318 if (! elf_i386_tls_transition (info
, input_bfd
,
4319 input_section
, contents
,
4320 symtab_hdr
, sym_hashes
,
4321 &r_type
, tls_type
, rel
,
4322 relend
, h
, r_symndx
))
4325 if (r_type
== R_386_TLS_LE_32
)
4327 BFD_ASSERT (! unresolved_reloc
);
4328 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
4333 /* GD->LE transition. */
4334 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4337 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4339 movl %gs:0, %eax; subl $foo@tpoff, %eax
4340 (6 byte form of subl). */
4341 memcpy (contents
+ rel
->r_offset
- 3,
4342 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4343 roff
= rel
->r_offset
+ 5;
4347 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4349 movl %gs:0, %eax; subl $foo@tpoff, %eax
4350 (6 byte form of subl). */
4351 memcpy (contents
+ rel
->r_offset
- 2,
4352 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4353 roff
= rel
->r_offset
+ 6;
4355 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
4357 /* Skip R_386_PC32/R_386_PLT32. */
4361 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
4363 /* GDesc -> LE transition.
4364 It's originally something like:
4365 leal x@tlsdesc(%ebx), %eax
4369 Registers other than %eax may be set up here. */
4374 roff
= rel
->r_offset
;
4375 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4377 /* Now modify the instruction as appropriate. */
4378 /* aoliva FIXME: remove the above and xor the byte
4380 bfd_put_8 (output_bfd
, val
^ 0x86,
4381 contents
+ roff
- 1);
4382 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4386 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
4388 /* GDesc -> LE transition.
4396 roff
= rel
->r_offset
;
4397 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4398 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4401 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
4405 /* IE->LE transition:
4406 Originally it can be one of:
4414 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4417 /* movl foo, %eax. */
4418 bfd_put_8 (output_bfd
, 0xb8,
4419 contents
+ rel
->r_offset
- 1);
4425 type
= bfd_get_8 (input_bfd
,
4426 contents
+ rel
->r_offset
- 2);
4431 bfd_put_8 (output_bfd
, 0xc7,
4432 contents
+ rel
->r_offset
- 2);
4433 bfd_put_8 (output_bfd
,
4434 0xc0 | ((val
>> 3) & 7),
4435 contents
+ rel
->r_offset
- 1);
4439 bfd_put_8 (output_bfd
, 0x81,
4440 contents
+ rel
->r_offset
- 2);
4441 bfd_put_8 (output_bfd
,
4442 0xc0 | ((val
>> 3) & 7),
4443 contents
+ rel
->r_offset
- 1);
4450 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4451 contents
+ rel
->r_offset
);
4456 unsigned int val
, type
;
4458 /* {IE_32,GOTIE}->LE transition:
4459 Originally it can be one of:
4460 subl foo(%reg1), %reg2
4461 movl foo(%reg1), %reg2
4462 addl foo(%reg1), %reg2
4465 movl $foo, %reg2 (6 byte form)
4466 addl $foo, %reg2. */
4467 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4468 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4472 bfd_put_8 (output_bfd
, 0xc7,
4473 contents
+ rel
->r_offset
- 2);
4474 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4475 contents
+ rel
->r_offset
- 1);
4477 else if (type
== 0x2b)
4480 bfd_put_8 (output_bfd
, 0x81,
4481 contents
+ rel
->r_offset
- 2);
4482 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
4483 contents
+ rel
->r_offset
- 1);
4485 else if (type
== 0x03)
4488 bfd_put_8 (output_bfd
, 0x81,
4489 contents
+ rel
->r_offset
- 2);
4490 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4491 contents
+ rel
->r_offset
- 1);
4495 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
4496 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
4497 contents
+ rel
->r_offset
);
4499 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
4500 contents
+ rel
->r_offset
);
4505 if (htab
->elf
.sgot
== NULL
)
4510 off
= h
->got
.offset
;
4511 offplt
= elf_i386_hash_entry (h
)->tlsdesc_got
;
4515 if (local_got_offsets
== NULL
)
4518 off
= local_got_offsets
[r_symndx
];
4519 offplt
= local_tlsdesc_gotents
[r_symndx
];
4526 Elf_Internal_Rela outrel
;
4530 if (htab
->elf
.srelgot
== NULL
)
4533 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4535 if (GOT_TLS_GDESC_P (tls_type
))
4538 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
4539 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
4540 <= htab
->elf
.sgotplt
->size
);
4541 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4542 + htab
->elf
.sgotplt
->output_offset
4544 + htab
->sgotplt_jump_table_size
);
4545 sreloc
= htab
->elf
.srelplt
;
4546 loc
= sreloc
->contents
;
4547 loc
+= (htab
->next_tls_desc_index
++
4548 * sizeof (Elf32_External_Rel
));
4549 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
4550 <= sreloc
->contents
+ sreloc
->size
);
4551 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4554 BFD_ASSERT (! unresolved_reloc
);
4555 bfd_put_32 (output_bfd
,
4556 relocation
- elf_i386_dtpoff_base (info
),
4557 htab
->elf
.sgotplt
->contents
+ offplt
4558 + htab
->sgotplt_jump_table_size
+ 4);
4562 bfd_put_32 (output_bfd
, 0,
4563 htab
->elf
.sgotplt
->contents
+ offplt
4564 + htab
->sgotplt_jump_table_size
+ 4);
4568 sreloc
= htab
->elf
.srelgot
;
4570 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4571 + htab
->elf
.sgot
->output_offset
+ off
);
4573 if (GOT_TLS_GD_P (tls_type
))
4574 dr_type
= R_386_TLS_DTPMOD32
;
4575 else if (GOT_TLS_GDESC_P (tls_type
))
4577 else if (tls_type
== GOT_TLS_IE_POS
)
4578 dr_type
= R_386_TLS_TPOFF
;
4580 dr_type
= R_386_TLS_TPOFF32
;
4582 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
4583 bfd_put_32 (output_bfd
,
4584 relocation
- elf_i386_dtpoff_base (info
),
4585 htab
->elf
.sgot
->contents
+ off
);
4586 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
4587 bfd_put_32 (output_bfd
,
4588 elf_i386_dtpoff_base (info
) - relocation
,
4589 htab
->elf
.sgot
->contents
+ off
);
4590 else if (dr_type
!= R_386_TLS_DESC
)
4591 bfd_put_32 (output_bfd
, 0,
4592 htab
->elf
.sgot
->contents
+ off
);
4593 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
4595 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4597 if (GOT_TLS_GD_P (tls_type
))
4601 BFD_ASSERT (! unresolved_reloc
);
4602 bfd_put_32 (output_bfd
,
4603 relocation
- elf_i386_dtpoff_base (info
),
4604 htab
->elf
.sgot
->contents
+ off
+ 4);
4608 bfd_put_32 (output_bfd
, 0,
4609 htab
->elf
.sgot
->contents
+ off
+ 4);
4610 outrel
.r_info
= ELF32_R_INFO (indx
,
4611 R_386_TLS_DTPOFF32
);
4612 outrel
.r_offset
+= 4;
4613 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4616 else if (tls_type
== GOT_TLS_IE_BOTH
)
4618 bfd_put_32 (output_bfd
,
4620 ? relocation
- elf_i386_dtpoff_base (info
)
4622 htab
->elf
.sgot
->contents
+ off
+ 4);
4623 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
4624 outrel
.r_offset
+= 4;
4625 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4632 local_got_offsets
[r_symndx
] |= 1;
4635 if (off
>= (bfd_vma
) -2
4636 && ! GOT_TLS_GDESC_P (tls_type
))
4638 if (r_type
== R_386_TLS_GOTDESC
4639 || r_type
== R_386_TLS_DESC_CALL
)
4641 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
4642 unresolved_reloc
= FALSE
;
4644 else if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4646 bfd_vma g_o_t
= htab
->elf
.sgotplt
->output_section
->vma
4647 + htab
->elf
.sgotplt
->output_offset
;
4648 relocation
= htab
->elf
.sgot
->output_section
->vma
4649 + htab
->elf
.sgot
->output_offset
+ off
- g_o_t
;
4650 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
4651 && tls_type
== GOT_TLS_IE_BOTH
)
4653 if (r_type
== R_386_TLS_IE
)
4654 relocation
+= g_o_t
;
4655 unresolved_reloc
= FALSE
;
4657 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
4659 unsigned int val
, type
;
4662 /* GD->IE transition. */
4663 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4664 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4667 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4669 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4671 roff
= rel
->r_offset
- 3;
4675 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4677 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4678 roff
= rel
->r_offset
- 2;
4680 memcpy (contents
+ roff
,
4681 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4682 contents
[roff
+ 7] = 0x80 | (val
& 7);
4683 /* If foo is used only with foo@gotntpoff(%reg) and
4684 foo@indntpoff, but not with foo@gottpoff(%reg), change
4685 subl $foo@gottpoff(%reg), %eax
4687 addl $foo@gotntpoff(%reg), %eax. */
4688 if (tls_type
== GOT_TLS_IE_POS
)
4689 contents
[roff
+ 6] = 0x03;
4690 bfd_put_32 (output_bfd
,
4691 htab
->elf
.sgot
->output_section
->vma
4692 + htab
->elf
.sgot
->output_offset
+ off
4693 - htab
->elf
.sgotplt
->output_section
->vma
4694 - htab
->elf
.sgotplt
->output_offset
,
4695 contents
+ roff
+ 8);
4696 /* Skip R_386_PLT32. */
4700 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
4702 /* GDesc -> IE transition.
4703 It's originally something like:
4704 leal x@tlsdesc(%ebx), %eax
4707 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4709 movl x@gottpoff(%ebx), %eax # before negl %eax
4711 Registers other than %eax may be set up here. */
4715 /* First, make sure it's a leal adding ebx to a 32-bit
4716 offset into any register, although it's probably
4717 almost always going to be eax. */
4718 roff
= rel
->r_offset
;
4720 /* Now modify the instruction as appropriate. */
4721 /* To turn a leal into a movl in the form we use it, it
4722 suffices to change the first byte from 0x8d to 0x8b.
4723 aoliva FIXME: should we decide to keep the leal, all
4724 we have to do is remove the statement below, and
4725 adjust the relaxation of R_386_TLS_DESC_CALL. */
4726 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4728 if (tls_type
== GOT_TLS_IE_BOTH
)
4731 bfd_put_32 (output_bfd
,
4732 htab
->elf
.sgot
->output_section
->vma
4733 + htab
->elf
.sgot
->output_offset
+ off
4734 - htab
->elf
.sgotplt
->output_section
->vma
4735 - htab
->elf
.sgotplt
->output_offset
,
4739 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
4741 /* GDesc -> IE transition.
4749 depending on how we transformed the TLS_GOTDESC above.
4754 roff
= rel
->r_offset
;
4756 /* Now modify the instruction as appropriate. */
4757 if (tls_type
!= GOT_TLS_IE_NEG
)
4760 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4761 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4766 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
4767 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
4777 if (! elf_i386_tls_transition (info
, input_bfd
,
4778 input_section
, contents
,
4779 symtab_hdr
, sym_hashes
,
4780 &r_type
, GOT_UNKNOWN
, rel
,
4781 relend
, h
, r_symndx
))
4784 if (r_type
!= R_386_TLS_LDM
)
4786 /* LD->LE transition:
4787 leal foo(%reg), %eax; call ___tls_get_addr.
4789 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4790 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
4791 memcpy (contents
+ rel
->r_offset
- 2,
4792 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4793 /* Skip R_386_PC32/R_386_PLT32. */
4798 if (htab
->elf
.sgot
== NULL
)
4801 off
= htab
->tls_ldm_got
.offset
;
4806 Elf_Internal_Rela outrel
;
4808 if (htab
->elf
.srelgot
== NULL
)
4811 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4812 + htab
->elf
.sgot
->output_offset
+ off
);
4814 bfd_put_32 (output_bfd
, 0,
4815 htab
->elf
.sgot
->contents
+ off
);
4816 bfd_put_32 (output_bfd
, 0,
4817 htab
->elf
.sgot
->contents
+ off
+ 4);
4818 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
4819 elf_append_rel (output_bfd
, htab
->elf
.srelgot
, &outrel
);
4820 htab
->tls_ldm_got
.offset
|= 1;
4822 relocation
= htab
->elf
.sgot
->output_section
->vma
4823 + htab
->elf
.sgot
->output_offset
+ off
4824 - htab
->elf
.sgotplt
->output_section
->vma
4825 - htab
->elf
.sgotplt
->output_offset
;
4826 unresolved_reloc
= FALSE
;
4829 case R_386_TLS_LDO_32
:
4830 if (!bfd_link_executable (info
)
4831 || (input_section
->flags
& SEC_CODE
) == 0)
4832 relocation
-= elf_i386_dtpoff_base (info
);
4834 /* When converting LDO to LE, we must negate. */
4835 relocation
= -elf_i386_tpoff (info
, relocation
);
4838 case R_386_TLS_LE_32
:
4840 if (!bfd_link_executable (info
))
4842 Elf_Internal_Rela outrel
;
4845 outrel
.r_offset
= rel
->r_offset
4846 + input_section
->output_section
->vma
4847 + input_section
->output_offset
;
4848 if (h
!= NULL
&& h
->dynindx
!= -1)
4852 if (r_type
== R_386_TLS_LE_32
)
4853 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
4855 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
4856 sreloc
= elf_section_data (input_section
)->sreloc
;
4859 elf_append_rel (output_bfd
, sreloc
, &outrel
);
4862 else if (r_type
== R_386_TLS_LE_32
)
4863 relocation
= elf_i386_dtpoff_base (info
) - relocation
;
4865 relocation
-= elf_i386_dtpoff_base (info
);
4867 else if (r_type
== R_386_TLS_LE_32
)
4868 relocation
= elf_i386_tpoff (info
, relocation
);
4870 relocation
= -elf_i386_tpoff (info
, relocation
);
4877 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4878 because such sections are not SEC_ALLOC and thus ld.so will
4879 not process them. */
4880 if (unresolved_reloc
4881 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4883 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4884 rel
->r_offset
) != (bfd_vma
) -1)
4886 (*_bfd_error_handler
)
4887 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4890 (long) rel
->r_offset
,
4892 h
->root
.root
.string
);
4897 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4898 contents
, rel
->r_offset
,
4901 check_relocation_error
:
4902 if (r
!= bfd_reloc_ok
)
4907 name
= h
->root
.root
.string
;
4910 name
= bfd_elf_string_from_elf_section (input_bfd
,
4911 symtab_hdr
->sh_link
,
4916 name
= bfd_section_name (input_bfd
, sec
);
4919 if (r
== bfd_reloc_overflow
)
4921 if (! ((*info
->callbacks
->reloc_overflow
)
4922 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4923 (bfd_vma
) 0, input_bfd
, input_section
,
4929 (*_bfd_error_handler
)
4930 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4931 input_bfd
, input_section
,
4932 (long) rel
->r_offset
, name
, (int) r
);
4941 /* Finish up dynamic symbol handling. We set the contents of various
4942 dynamic sections here. */
4945 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
4946 struct bfd_link_info
*info
,
4947 struct elf_link_hash_entry
*h
,
4948 Elf_Internal_Sym
*sym
)
4950 struct elf_i386_link_hash_table
*htab
;
4951 unsigned plt_entry_size
;
4952 const struct elf_i386_backend_data
*abed
;
4953 struct elf_i386_link_hash_entry
*eh
;
4955 htab
= elf_i386_hash_table (info
);
4959 abed
= get_elf_i386_backend_data (output_bfd
);
4960 plt_entry_size
= GET_PLT_ENTRY_SIZE (output_bfd
);
4962 eh
= (struct elf_i386_link_hash_entry
*) h
;
4964 if (h
->plt
.offset
!= (bfd_vma
) -1)
4968 Elf_Internal_Rela rel
;
4970 asection
*plt
, *gotplt
, *relplt
;
4972 /* When building a static executable, use .iplt, .igot.plt and
4973 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4974 if (htab
->elf
.splt
!= NULL
)
4976 plt
= htab
->elf
.splt
;
4977 gotplt
= htab
->elf
.sgotplt
;
4978 relplt
= htab
->elf
.srelplt
;
4982 plt
= htab
->elf
.iplt
;
4983 gotplt
= htab
->elf
.igotplt
;
4984 relplt
= htab
->elf
.irelplt
;
4987 /* This symbol has an entry in the procedure linkage table. Set
4990 if ((h
->dynindx
== -1
4991 && !((h
->forced_local
|| bfd_link_executable (info
))
4993 && h
->type
== STT_GNU_IFUNC
))
4999 /* Get the index in the procedure linkage table which
5000 corresponds to this symbol. This is the index of this symbol
5001 in all the symbols for which we are making plt entries. The
5002 first entry in the procedure linkage table is reserved.
5004 Get the offset into the .got table of the entry that
5005 corresponds to this function. Each .got entry is 4 bytes.
5006 The first three are reserved.
5008 For static executables, we don't reserve anything. */
5010 if (plt
== htab
->elf
.splt
)
5012 got_offset
= h
->plt
.offset
/ plt_entry_size
- 1;
5013 got_offset
= (got_offset
+ 3) * 4;
5017 got_offset
= h
->plt
.offset
/ plt_entry_size
;
5018 got_offset
= got_offset
* 4;
5021 /* Fill in the entry in the procedure linkage table. */
5022 if (! bfd_link_pic (info
))
5024 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt
->plt_entry
,
5025 abed
->plt
->plt_entry_size
);
5026 bfd_put_32 (output_bfd
,
5027 (gotplt
->output_section
->vma
5028 + gotplt
->output_offset
5030 plt
->contents
+ h
->plt
.offset
5031 + abed
->plt
->plt_got_offset
);
5033 if (abed
->is_vxworks
)
5035 int s
, k
, reloc_index
;
5037 /* Create the R_386_32 relocation referencing the GOT
5038 for this PLT entry. */
5040 /* S: Current slot number (zero-based). */
5041 s
= ((h
->plt
.offset
- abed
->plt
->plt_entry_size
)
5042 / abed
->plt
->plt_entry_size
);
5043 /* K: Number of relocations for PLTResolve. */
5044 if (bfd_link_pic (info
))
5045 k
= PLTRESOLVE_RELOCS_SHLIB
;
5047 k
= PLTRESOLVE_RELOCS
;
5048 /* Skip the PLTresolve relocations, and the relocations for
5049 the other PLT slots. */
5050 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
5051 loc
= (htab
->srelplt2
->contents
+ reloc_index
5052 * sizeof (Elf32_External_Rel
));
5054 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
5055 + htab
->elf
.splt
->output_offset
5056 + h
->plt
.offset
+ 2),
5057 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
5058 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
5060 /* Create the R_386_32 relocation referencing the beginning of
5061 the PLT for this GOT entry. */
5062 rel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
5063 + htab
->elf
.sgotplt
->output_offset
5065 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
5066 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
5067 loc
+ sizeof (Elf32_External_Rel
));
5072 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt
->pic_plt_entry
,
5073 abed
->plt
->plt_entry_size
);
5074 bfd_put_32 (output_bfd
, got_offset
,
5075 plt
->contents
+ h
->plt
.offset
5076 + abed
->plt
->plt_got_offset
);
5079 /* Fill in the entry in the global offset table. */
5080 bfd_put_32 (output_bfd
,
5081 (plt
->output_section
->vma
5082 + plt
->output_offset
5084 + abed
->plt
->plt_lazy_offset
),
5085 gotplt
->contents
+ got_offset
);
5087 /* Fill in the entry in the .rel.plt section. */
5088 rel
.r_offset
= (gotplt
->output_section
->vma
5089 + gotplt
->output_offset
5091 if (h
->dynindx
== -1
5092 || ((bfd_link_executable (info
)
5093 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5095 && h
->type
== STT_GNU_IFUNC
))
5097 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5098 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5099 in the .got.plt section. */
5100 bfd_put_32 (output_bfd
,
5101 (h
->root
.u
.def
.value
5102 + h
->root
.u
.def
.section
->output_section
->vma
5103 + h
->root
.u
.def
.section
->output_offset
),
5104 gotplt
->contents
+ got_offset
);
5105 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
5106 /* R_386_IRELATIVE comes last. */
5107 plt_index
= htab
->next_irelative_index
--;
5111 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
5112 plt_index
= htab
->next_jump_slot_index
++;
5114 loc
= relplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
5115 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
5117 /* Don't fill PLT entry for static executables. */
5118 if (plt
== htab
->elf
.splt
)
5120 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
5121 plt
->contents
+ h
->plt
.offset
5122 + abed
->plt
->plt_reloc_offset
);
5123 bfd_put_32 (output_bfd
, - (h
->plt
.offset
5124 + abed
->plt
->plt_plt_offset
+ 4),
5125 plt
->contents
+ h
->plt
.offset
5126 + abed
->plt
->plt_plt_offset
);
5129 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5131 bfd_vma got_offset
, plt_offset
;
5132 asection
*plt
, *got
, *gotplt
;
5133 const bfd_byte
*got_plt_entry
;
5135 /* Offset of displacement of the indirect jump. */
5136 bfd_vma plt_got_offset
= 2;
5138 /* Set the entry in the GOT procedure linkage table. */
5139 plt
= htab
->plt_got
;
5140 got
= htab
->elf
.sgot
;
5141 gotplt
= htab
->elf
.sgotplt
;
5142 got_offset
= h
->got
.offset
;
5144 if (got_offset
== (bfd_vma
) -1
5150 /* Fill in the entry in the GOT procedure linkage table. */
5151 if (! bfd_link_pic (info
))
5153 got_plt_entry
= elf_i386_got_plt_entry
;
5154 got_offset
+= got
->output_section
->vma
+ got
->output_offset
;
5158 got_plt_entry
= elf_i386_pic_got_plt_entry
;
5159 got_offset
+= (got
->output_section
->vma
5160 + got
->output_offset
5161 - gotplt
->output_section
->vma
5162 - gotplt
->output_offset
);
5165 plt_offset
= eh
->plt_got
.offset
;
5166 memcpy (plt
->contents
+ plt_offset
, got_plt_entry
,
5167 sizeof (elf_i386_got_plt_entry
));
5168 bfd_put_32 (output_bfd
, got_offset
,
5169 plt
->contents
+ plt_offset
+ plt_got_offset
);
5173 && (h
->plt
.offset
!= (bfd_vma
) -1
5174 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5176 /* Mark the symbol as undefined, rather than as defined in
5177 the .plt section. Leave the value if there were any
5178 relocations where pointer equality matters (this is a clue
5179 for the dynamic linker, to make function pointer
5180 comparisons work between an application and shared
5181 library), otherwise set it to zero. If a function is only
5182 called from a binary, there is no need to slow down
5183 shared libraries because of that. */
5184 sym
->st_shndx
= SHN_UNDEF
;
5185 if (!h
->pointer_equality_needed
)
5189 if (h
->got
.offset
!= (bfd_vma
) -1
5190 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h
)->tls_type
)
5191 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
5193 Elf_Internal_Rela rel
;
5195 /* This symbol has an entry in the global offset table. Set it
5198 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5201 rel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5202 + htab
->elf
.sgot
->output_offset
5203 + (h
->got
.offset
& ~(bfd_vma
) 1));
5205 /* If this is a static link, or it is a -Bsymbolic link and the
5206 symbol is defined locally or was forced to be local because
5207 of a version file, we just want to emit a RELATIVE reloc.
5208 The entry in the global offset table will already have been
5209 initialized in the relocate_section function. */
5211 && h
->type
== STT_GNU_IFUNC
)
5213 if (bfd_link_pic (info
))
5215 /* Generate R_386_GLOB_DAT. */
5222 if (!h
->pointer_equality_needed
)
5225 /* For non-shared object, we can't use .got.plt, which
5226 contains the real function addres if we need pointer
5227 equality. We load the GOT entry with the PLT entry. */
5228 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5229 bfd_put_32 (output_bfd
,
5230 (plt
->output_section
->vma
5231 + plt
->output_offset
+ h
->plt
.offset
),
5232 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5236 else if (bfd_link_pic (info
)
5237 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5239 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5240 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
5244 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5246 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
5247 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5248 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
5251 elf_append_rel (output_bfd
, htab
->elf
.srelgot
, &rel
);
5256 Elf_Internal_Rela rel
;
5258 /* This symbol needs a copy reloc. Set it up. */
5260 if (h
->dynindx
== -1
5261 || (h
->root
.type
!= bfd_link_hash_defined
5262 && h
->root
.type
!= bfd_link_hash_defweak
)
5263 || htab
->srelbss
== NULL
)
5266 rel
.r_offset
= (h
->root
.u
.def
.value
5267 + h
->root
.u
.def
.section
->output_section
->vma
5268 + h
->root
.u
.def
.section
->output_offset
);
5269 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
5270 elf_append_rel (output_bfd
, htab
->srelbss
, &rel
);
5276 /* Finish up local dynamic symbol handling. We set the contents of
5277 various dynamic sections here. */
5280 elf_i386_finish_local_dynamic_symbol (void **slot
, void *inf
)
5282 struct elf_link_hash_entry
*h
5283 = (struct elf_link_hash_entry
*) *slot
;
5284 struct bfd_link_info
*info
5285 = (struct bfd_link_info
*) inf
;
5287 return elf_i386_finish_dynamic_symbol (info
->output_bfd
, info
,
5291 /* Used to decide how to sort relocs in an optimal manner for the
5292 dynamic linker, before writing them out. */
5294 static enum elf_reloc_type_class
5295 elf_i386_reloc_type_class (const struct bfd_link_info
*info
,
5296 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5297 const Elf_Internal_Rela
*rela
)
5299 bfd
*abfd
= info
->output_bfd
;
5300 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5301 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
5302 unsigned long r_symndx
= ELF32_R_SYM (rela
->r_info
);
5303 Elf_Internal_Sym sym
;
5305 if (htab
->dynsym
== NULL
5306 || !bed
->s
->swap_symbol_in (abfd
,
5307 (htab
->dynsym
->contents
5308 + r_symndx
* sizeof (Elf32_External_Sym
)),
5312 /* Check relocation against STT_GNU_IFUNC symbol. */
5313 if (ELF32_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5314 return reloc_class_ifunc
;
5316 switch (ELF32_R_TYPE (rela
->r_info
))
5318 case R_386_RELATIVE
:
5319 return reloc_class_relative
;
5320 case R_386_JUMP_SLOT
:
5321 return reloc_class_plt
;
5323 return reloc_class_copy
;
5325 return reloc_class_normal
;
5329 /* Finish up the dynamic sections. */
5332 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
5333 struct bfd_link_info
*info
)
5335 struct elf_i386_link_hash_table
*htab
;
5338 const struct elf_i386_backend_data
*abed
;
5340 htab
= elf_i386_hash_table (info
);
5344 dynobj
= htab
->elf
.dynobj
;
5345 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5346 abed
= get_elf_i386_backend_data (output_bfd
);
5348 if (htab
->elf
.dynamic_sections_created
)
5350 Elf32_External_Dyn
*dyncon
, *dynconend
;
5352 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5355 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
5356 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
5357 for (; dyncon
< dynconend
; dyncon
++)
5359 Elf_Internal_Dyn dyn
;
5362 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5367 if (abed
->is_vxworks
5368 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
5373 s
= htab
->elf
.sgotplt
;
5374 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5378 s
= htab
->elf
.srelplt
;
5379 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5383 s
= htab
->elf
.srelplt
;
5384 dyn
.d_un
.d_val
= s
->size
;
5388 /* My reading of the SVR4 ABI indicates that the
5389 procedure linkage table relocs (DT_JMPREL) should be
5390 included in the overall relocs (DT_REL). This is
5391 what Solaris does. However, UnixWare can not handle
5392 that case. Therefore, we override the DT_RELSZ entry
5393 here to make it not include the JMPREL relocs. */
5394 s
= htab
->elf
.srelplt
;
5397 dyn
.d_un
.d_val
-= s
->size
;
5401 /* We may not be using the standard ELF linker script.
5402 If .rel.plt is the first .rel section, we adjust
5403 DT_REL to not include it. */
5404 s
= htab
->elf
.srelplt
;
5407 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
5409 dyn
.d_un
.d_ptr
+= s
->size
;
5413 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
5416 /* Fill in the first entry in the procedure linkage table. */
5417 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5419 if (bfd_link_pic (info
))
5421 memcpy (htab
->elf
.splt
->contents
, abed
->plt
->pic_plt0_entry
,
5422 abed
->plt
->plt0_entry_size
);
5423 memset (htab
->elf
.splt
->contents
+ abed
->plt
->plt0_entry_size
,
5424 abed
->plt0_pad_byte
,
5425 abed
->plt
->plt_entry_size
- abed
->plt
->plt0_entry_size
);
5429 memcpy (htab
->elf
.splt
->contents
, abed
->plt
->plt0_entry
,
5430 abed
->plt
->plt0_entry_size
);
5431 memset (htab
->elf
.splt
->contents
+ abed
->plt
->plt0_entry_size
,
5432 abed
->plt0_pad_byte
,
5433 abed
->plt
->plt_entry_size
- abed
->plt
->plt0_entry_size
);
5434 bfd_put_32 (output_bfd
,
5435 (htab
->elf
.sgotplt
->output_section
->vma
5436 + htab
->elf
.sgotplt
->output_offset
5438 htab
->elf
.splt
->contents
5439 + abed
->plt
->plt0_got1_offset
);
5440 bfd_put_32 (output_bfd
,
5441 (htab
->elf
.sgotplt
->output_section
->vma
5442 + htab
->elf
.sgotplt
->output_offset
5444 htab
->elf
.splt
->contents
5445 + abed
->plt
->plt0_got2_offset
);
5447 if (abed
->is_vxworks
)
5449 Elf_Internal_Rela rel
;
5451 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5452 On IA32 we use REL relocations so the addend goes in
5453 the PLT directly. */
5454 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
5455 + htab
->elf
.splt
->output_offset
5456 + abed
->plt
->plt0_got1_offset
);
5457 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
5458 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
5459 htab
->srelplt2
->contents
);
5460 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5461 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
5462 + htab
->elf
.splt
->output_offset
5463 + abed
->plt
->plt0_got2_offset
);
5464 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
5465 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
5466 htab
->srelplt2
->contents
+
5467 sizeof (Elf32_External_Rel
));
5471 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5472 really seem like the right value. */
5473 elf_section_data (htab
->elf
.splt
->output_section
)
5474 ->this_hdr
.sh_entsize
= 4;
5476 /* Correct the .rel.plt.unloaded relocations. */
5477 if (abed
->is_vxworks
&& !bfd_link_pic (info
))
5479 int num_plts
= (htab
->elf
.splt
->size
5480 / abed
->plt
->plt_entry_size
) - 1;
5483 p
= htab
->srelplt2
->contents
;
5484 if (bfd_link_pic (info
))
5485 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
5487 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
5489 for (; num_plts
; num_plts
--)
5491 Elf_Internal_Rela rel
;
5492 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
5493 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
5494 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
5495 p
+= sizeof (Elf32_External_Rel
);
5497 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
5498 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
5499 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
5500 p
+= sizeof (Elf32_External_Rel
);
5506 if (htab
->elf
.sgotplt
)
5508 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5510 (*_bfd_error_handler
)
5511 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5515 /* Fill in the first three entries in the global offset table. */
5516 if (htab
->elf
.sgotplt
->size
> 0)
5518 bfd_put_32 (output_bfd
,
5520 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
5521 htab
->elf
.sgotplt
->contents
);
5522 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 4);
5523 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 8);
5526 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
5529 /* Adjust .eh_frame for .plt section. */
5530 if (htab
->plt_eh_frame
!= NULL
5531 && htab
->plt_eh_frame
->contents
!= NULL
)
5533 if (htab
->elf
.splt
!= NULL
5534 && htab
->elf
.splt
->size
!= 0
5535 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5536 && htab
->elf
.splt
->output_section
!= NULL
5537 && htab
->plt_eh_frame
->output_section
!= NULL
)
5539 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5540 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5541 + htab
->plt_eh_frame
->output_offset
5542 + PLT_FDE_START_OFFSET
;
5543 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5544 htab
->plt_eh_frame
->contents
5545 + PLT_FDE_START_OFFSET
);
5547 if (htab
->plt_eh_frame
->sec_info_type
5548 == SEC_INFO_TYPE_EH_FRAME
)
5550 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5552 htab
->plt_eh_frame
->contents
))
5557 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5558 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
5560 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5561 htab_traverse (htab
->loc_hash_table
,
5562 elf_i386_finish_local_dynamic_symbol
,
5568 /* Return an array of PLT entry symbol values. */
5571 elf_i386_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5574 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5577 bfd_vma
*plt_sym_val
;
5579 bfd_byte
*plt_contents
;
5580 const struct elf_i386_backend_data
*bed
5581 = get_elf_i386_backend_data (abfd
);
5582 Elf_Internal_Shdr
*hdr
;
5584 /* Get the .plt section contents. */
5585 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5586 if (plt_contents
== NULL
)
5588 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5589 plt_contents
, 0, plt
->size
))
5592 free (plt_contents
);
5596 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5597 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5600 hdr
= &elf_section_data (relplt
)->this_hdr
;
5601 count
= relplt
->size
/ hdr
->sh_entsize
;
5603 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5604 if (plt_sym_val
== NULL
)
5607 for (i
= 0; i
< count
; i
++)
5608 plt_sym_val
[i
] = -1;
5610 plt_offset
= bed
->plt
->plt_entry_size
;
5611 p
= relplt
->relocation
;
5612 for (i
= 0; i
< count
; i
++, p
++)
5616 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5617 if (p
->howto
== NULL
)
5620 if (p
->howto
->type
!= R_386_JUMP_SLOT
5621 && p
->howto
->type
!= R_386_IRELATIVE
)
5624 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5625 + bed
->plt
->plt_reloc_offset
));
5626 reloc_index
/= sizeof (Elf32_External_Rel
);
5627 if (reloc_index
>= count
)
5629 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
5630 plt_offset
+= bed
->plt
->plt_entry_size
;
5632 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5634 if (plt_offset
>= plt
->size
)
5638 free (plt_contents
);
5643 /* Similar to _bfd_elf_get_synthetic_symtab. */
5646 elf_i386_get_synthetic_symtab (bfd
*abfd
,
5653 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt");
5654 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
5655 dynsymcount
, dynsyms
, ret
,
5657 elf_i386_get_plt_sym_val
);
5660 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5663 elf_i386_hash_symbol (struct elf_link_hash_entry
*h
)
5665 if (h
->plt
.offset
!= (bfd_vma
) -1
5667 && !h
->pointer_equality_needed
)
5670 return _bfd_elf_hash_symbol (h
);
5673 /* Hook called by the linker routine which adds symbols from an object
5677 elf_i386_add_symbol_hook (bfd
* abfd
,
5678 struct bfd_link_info
* info
,
5679 Elf_Internal_Sym
* sym
,
5680 const char ** namep ATTRIBUTE_UNUSED
,
5681 flagword
* flagsp ATTRIBUTE_UNUSED
,
5682 asection
** secp ATTRIBUTE_UNUSED
,
5683 bfd_vma
* valp ATTRIBUTE_UNUSED
)
5685 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
5686 && (abfd
->flags
& DYNAMIC
) == 0
5687 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5688 elf_tdata (info
->output_bfd
)->has_gnu_symbols
5689 |= elf_gnu_symbol_unique
;
5694 #define TARGET_LITTLE_SYM i386_elf32_vec
5695 #define TARGET_LITTLE_NAME "elf32-i386"
5696 #define ELF_ARCH bfd_arch_i386
5697 #define ELF_TARGET_ID I386_ELF_DATA
5698 #define ELF_MACHINE_CODE EM_386
5699 #define ELF_MAXPAGESIZE 0x1000
5701 #define elf_backend_can_gc_sections 1
5702 #define elf_backend_can_refcount 1
5703 #define elf_backend_want_got_plt 1
5704 #define elf_backend_plt_readonly 1
5705 #define elf_backend_want_plt_sym 0
5706 #define elf_backend_got_header_size 12
5707 #define elf_backend_plt_alignment 4
5708 #define elf_backend_extern_protected_data 1
5710 /* Support RELA for objdump of prelink objects. */
5711 #define elf_info_to_howto elf_i386_info_to_howto_rel
5712 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5714 #define bfd_elf32_mkobject elf_i386_mkobject
5716 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5717 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5718 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5719 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5720 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5722 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5723 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5724 #define elf_backend_check_relocs elf_i386_check_relocs
5725 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5726 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5727 #define elf_backend_fake_sections elf_i386_fake_sections
5728 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5729 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5730 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5731 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5732 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5733 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5734 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5735 #define elf_backend_relocate_section elf_i386_relocate_section
5736 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5737 #define elf_backend_always_size_sections elf_i386_always_size_sections
5738 #define elf_backend_omit_section_dynsym \
5739 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5740 #define elf_backend_hash_symbol elf_i386_hash_symbol
5741 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5743 #include "elf32-target.h"
5745 /* FreeBSD support. */
5747 #undef TARGET_LITTLE_SYM
5748 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5749 #undef TARGET_LITTLE_NAME
5750 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5752 #define ELF_OSABI ELFOSABI_FREEBSD
5754 /* The kernel recognizes executables as valid only if they carry a
5755 "FreeBSD" label in the ELF header. So we put this label on all
5756 executables and (for simplicity) also all other object files. */
5759 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
5761 _bfd_elf_post_process_headers (abfd
, info
);
5763 #ifdef OLD_FREEBSD_ABI_LABEL
5765 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5766 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
5767 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
5772 #undef elf_backend_post_process_headers
5773 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5775 #define elf32_bed elf32_i386_fbsd_bed
5777 #undef elf_backend_add_symbol_hook
5779 #include "elf32-target.h"
5783 #undef TARGET_LITTLE_SYM
5784 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5785 #undef TARGET_LITTLE_NAME
5786 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5788 #undef elf_backend_post_process_headers
5790 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5791 objects won't be recognized. */
5795 #define elf32_bed elf32_i386_sol2_bed
5797 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5799 #undef elf_backend_static_tls_alignment
5800 #define elf_backend_static_tls_alignment 8
5802 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5804 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5806 #undef elf_backend_want_plt_sym
5807 #define elf_backend_want_plt_sym 1
5809 #include "elf32-target.h"
5811 /* Intel MCU support. */
5814 elf32_iamcu_elf_object_p (bfd
*abfd
)
5816 /* Set the right machine number for an IAMCU elf32 file. */
5817 bfd_default_set_arch_mach (abfd
, bfd_arch_iamcu
, bfd_mach_i386_iamcu
);
5821 #undef TARGET_LITTLE_SYM
5822 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5823 #undef TARGET_LITTLE_NAME
5824 #define TARGET_LITTLE_NAME "elf32-iamcu"
5826 #define ELF_ARCH bfd_arch_iamcu
5828 #undef ELF_MACHINE_CODE
5829 #define ELF_MACHINE_CODE EM_IAMCU
5834 #define elf32_bed elf32_iamcu_bed
5836 #undef elf_backend_object_p
5837 #define elf_backend_object_p elf32_iamcu_elf_object_p
5839 #undef elf_backend_static_tls_alignment
5841 #undef elf_backend_want_plt_sym
5842 #define elf_backend_want_plt_sym 0
5844 #include "elf32-target.h"
5846 /* Restore defaults. */
5848 #define ELF_ARCH bfd_arch_i386
5849 #undef ELF_MACHINE_CODE
5850 #define ELF_MACHINE_CODE EM_386
5852 /* Native Client support. */
5854 #undef TARGET_LITTLE_SYM
5855 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5856 #undef TARGET_LITTLE_NAME
5857 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5859 #define elf32_bed elf32_i386_nacl_bed
5861 #undef ELF_MAXPAGESIZE
5862 #define ELF_MAXPAGESIZE 0x10000
5864 /* Restore defaults. */
5866 #undef elf_backend_want_plt_sym
5867 #define elf_backend_want_plt_sym 0
5868 #undef elf_backend_post_process_headers
5869 #undef elf_backend_static_tls_alignment
5871 /* NaCl uses substantially different PLT entries for the same effects. */
5873 #undef elf_backend_plt_alignment
5874 #define elf_backend_plt_alignment 5
5875 #define NACL_PLT_ENTRY_SIZE 64
5876 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5878 static const bfd_byte elf_i386_nacl_plt0_entry
[] =
5880 0xff, 0x35, /* pushl contents of address */
5881 0, 0, 0, 0, /* replaced with address of .got + 4. */
5882 0x8b, 0x0d, /* movl contents of address, %ecx */
5883 0, 0, 0, 0, /* replaced with address of .got + 8. */
5884 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
5885 0xff, 0xe1 /* jmp *%ecx */
5888 static const bfd_byte elf_i386_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5890 0x8b, 0x0d, /* movl contents of address, %ecx */
5891 0, 0, 0, 0, /* replaced with GOT slot address. */
5892 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
5893 0xff, 0xe1, /* jmp *%ecx */
5895 /* Pad to the next 32-byte boundary with nop instructions. */
5897 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5898 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5900 /* Lazy GOT entries point here (32-byte aligned). */
5901 0x68, /* pushl immediate */
5902 0, 0, 0, 0, /* replaced with reloc offset. */
5903 0xe9, /* jmp relative */
5904 0, 0, 0, 0, /* replaced with offset to .plt. */
5906 /* Pad to the next 32-byte boundary with nop instructions. */
5907 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5908 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5912 static const bfd_byte
5913 elf_i386_nacl_pic_plt0_entry
[sizeof (elf_i386_nacl_plt0_entry
)] =
5915 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5916 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5917 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5918 0xff, 0xe1, /* jmp *%ecx */
5920 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5921 so pad to that size with nop instructions. */
5922 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5925 static const bfd_byte elf_i386_nacl_pic_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5927 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5928 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5929 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5930 0xff, 0xe1, /* jmp *%ecx */
5932 /* Pad to the next 32-byte boundary with nop instructions. */
5934 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5935 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5937 /* Lazy GOT entries point here (32-byte aligned). */
5938 0x68, /* pushl immediate */
5939 0, 0, 0, 0, /* replaced with offset into relocation table. */
5940 0xe9, /* jmp relative */
5941 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5943 /* Pad to the next 32-byte boundary with nop instructions. */
5944 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5945 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5949 static const bfd_byte elf_i386_nacl_eh_frame_plt
[] =
5951 #if (PLT_CIE_LENGTH != 20 \
5952 || PLT_FDE_LENGTH != 36 \
5953 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5954 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5955 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5957 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
5958 0, 0, 0, 0, /* CIE ID */
5959 1, /* CIE version */
5960 'z', 'R', 0, /* Augmentation string */
5961 1, /* Code alignment factor */
5962 0x7c, /* Data alignment factor: -4 */
5963 8, /* Return address column */
5964 1, /* Augmentation size */
5965 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
5966 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5967 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5968 DW_CFA_nop
, DW_CFA_nop
,
5970 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
5971 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
5972 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5973 0, 0, 0, 0, /* .plt size goes here */
5974 0, /* Augmentation size */
5975 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
5976 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5977 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
5978 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5979 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
5980 13, /* Block length */
5981 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
5982 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
5983 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5984 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
5985 DW_CFA_nop
, DW_CFA_nop
5988 static const struct elf_i386_plt_layout elf_i386_nacl_plt
=
5990 elf_i386_nacl_plt0_entry
, /* plt0_entry */
5991 sizeof (elf_i386_nacl_plt0_entry
), /* plt0_entry_size */
5992 2, /* plt0_got1_offset */
5993 8, /* plt0_got2_offset */
5994 elf_i386_nacl_plt_entry
, /* plt_entry */
5995 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5996 2, /* plt_got_offset */
5997 33, /* plt_reloc_offset */
5998 38, /* plt_plt_offset */
5999 32, /* plt_lazy_offset */
6000 elf_i386_nacl_pic_plt0_entry
, /* pic_plt0_entry */
6001 elf_i386_nacl_pic_plt_entry
, /* pic_plt_entry */
6002 elf_i386_nacl_eh_frame_plt
, /* eh_frame_plt */
6003 sizeof (elf_i386_nacl_eh_frame_plt
),/* eh_frame_plt_size */
6006 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed
=
6008 &elf_i386_nacl_plt
, /* plt */
6009 0x90, /* plt0_pad_byte: nop insn */
6014 elf32_i386_nacl_elf_object_p (bfd
*abfd
)
6016 /* Set the right machine number for a NaCl i386 ELF32 file. */
6017 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_i386_i386_nacl
);
6021 #undef elf_backend_arch_data
6022 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6024 #undef elf_backend_object_p
6025 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6026 #undef elf_backend_modify_segment_map
6027 #define elf_backend_modify_segment_map nacl_modify_segment_map
6028 #undef elf_backend_modify_program_headers
6029 #define elf_backend_modify_program_headers nacl_modify_program_headers
6030 #undef elf_backend_final_write_processing
6031 #define elf_backend_final_write_processing nacl_final_write_processing
6033 #include "elf32-target.h"
6035 /* Restore defaults. */
6036 #undef elf_backend_object_p
6037 #undef elf_backend_modify_segment_map
6038 #undef elf_backend_modify_program_headers
6039 #undef elf_backend_final_write_processing
6041 /* VxWorks support. */
6043 #undef TARGET_LITTLE_SYM
6044 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6045 #undef TARGET_LITTLE_NAME
6046 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6048 #undef elf_backend_plt_alignment
6049 #define elf_backend_plt_alignment 4
6051 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed
=
6053 &elf_i386_plt
, /* plt */
6054 0x90, /* plt0_pad_byte */
6058 #undef elf_backend_arch_data
6059 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6061 #undef elf_backend_relocs_compatible
6062 #undef elf_backend_add_symbol_hook
6063 #define elf_backend_add_symbol_hook \
6064 elf_vxworks_add_symbol_hook
6065 #undef elf_backend_link_output_symbol_hook
6066 #define elf_backend_link_output_symbol_hook \
6067 elf_vxworks_link_output_symbol_hook
6068 #undef elf_backend_emit_relocs
6069 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6070 #undef elf_backend_final_write_processing
6071 #define elf_backend_final_write_processing \
6072 elf_vxworks_final_write_processing
6073 #undef elf_backend_static_tls_alignment
6075 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6077 #undef elf_backend_want_plt_sym
6078 #define elf_backend_want_plt_sym 1
6081 #define elf32_bed elf32_i386_vxworks_bed
6083 #include "elf32-target.h"