1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
35 /* 386 uses REL relocations instead of RELA. */
40 static reloc_howto_type elf_howto_table
[]=
42 HOWTO(R_386_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_bitfield
,
43 bfd_elf_generic_reloc
, "R_386_NONE",
44 TRUE
, 0x00000000, 0x00000000, FALSE
),
45 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
46 bfd_elf_generic_reloc
, "R_386_32",
47 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
48 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
49 bfd_elf_generic_reloc
, "R_386_PC32",
50 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
51 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
52 bfd_elf_generic_reloc
, "R_386_GOT32",
53 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
54 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
55 bfd_elf_generic_reloc
, "R_386_PLT32",
56 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
57 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
58 bfd_elf_generic_reloc
, "R_386_COPY",
59 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
60 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
62 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
63 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
64 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
65 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
66 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
67 bfd_elf_generic_reloc
, "R_386_RELATIVE",
68 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
69 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
70 bfd_elf_generic_reloc
, "R_386_GOTOFF",
71 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
72 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
73 bfd_elf_generic_reloc
, "R_386_GOTPC",
74 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
85 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
86 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
87 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
88 bfd_elf_generic_reloc
, "R_386_TLS_IE",
89 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
90 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
91 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
92 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
93 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
94 bfd_elf_generic_reloc
, "R_386_TLS_LE",
95 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
96 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
97 bfd_elf_generic_reloc
, "R_386_TLS_GD",
98 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
99 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
100 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
101 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
102 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
103 bfd_elf_generic_reloc
, "R_386_16",
104 TRUE
, 0xffff, 0xffff, FALSE
),
105 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
106 bfd_elf_generic_reloc
, "R_386_PC16",
107 TRUE
, 0xffff, 0xffff, TRUE
),
108 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
109 bfd_elf_generic_reloc
, "R_386_8",
110 TRUE
, 0xff, 0xff, FALSE
),
111 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_386_PC8",
113 TRUE
, 0xff, 0xff, TRUE
),
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
119 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
120 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
121 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
122 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
123 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
124 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
125 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
126 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
127 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
128 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
129 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
130 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
131 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
132 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
133 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
134 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
135 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
137 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
138 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
139 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
140 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
141 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
143 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
144 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
145 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
146 HOWTO(R_386_IRELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
147 bfd_elf_generic_reloc
, "R_386_IRELATIVE",
148 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT
, /* type */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
159 FALSE
, /* pc_relative */
161 complain_overflow_dont
, /* complain_on_overflow */
162 NULL
, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE
, /* partial_inplace */
167 FALSE
), /* pcrel_offset */
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY
, /* type */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
174 FALSE
, /* pc_relative */
176 complain_overflow_dont
, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE
, /* partial_inplace */
182 FALSE
) /* pcrel_offset */
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
188 #ifdef DEBUG_GEN_RELOC
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 static reloc_howto_type
*
196 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
197 bfd_reloc_code_real_type code
)
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table
[R_386_NONE
];
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table
[R_386_32
];
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table
[R_386_32
];
213 case BFD_RELOC_32_PCREL
:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table
[R_386_PC32
];
217 case BFD_RELOC_386_GOT32
:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table
[R_386_GOT32
];
221 case BFD_RELOC_386_PLT32
:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table
[R_386_PLT32
];
225 case BFD_RELOC_386_COPY
:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table
[R_386_COPY
];
229 case BFD_RELOC_386_GLOB_DAT
:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table
[R_386_GLOB_DAT
];
233 case BFD_RELOC_386_JUMP_SLOT
:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table
[R_386_JUMP_SLOT
];
237 case BFD_RELOC_386_RELATIVE
:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table
[R_386_RELATIVE
];
241 case BFD_RELOC_386_GOTOFF
:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table
[R_386_GOTOFF
];
245 case BFD_RELOC_386_GOTPC
:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table
[R_386_GOTPC
];
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF
:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
254 case BFD_RELOC_386_TLS_IE
:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
258 case BFD_RELOC_386_TLS_GOTIE
:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
262 case BFD_RELOC_386_TLS_LE
:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
266 case BFD_RELOC_386_TLS_GD
:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
270 case BFD_RELOC_386_TLS_LDM
:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
278 case BFD_RELOC_16_PCREL
:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
286 case BFD_RELOC_8_PCREL
:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32
:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
295 case BFD_RELOC_386_TLS_IE_32
:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
299 case BFD_RELOC_386_TLS_LE_32
:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
303 case BFD_RELOC_386_TLS_DTPMOD32
:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
307 case BFD_RELOC_386_TLS_DTPOFF32
:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
311 case BFD_RELOC_386_TLS_TPOFF32
:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
315 case BFD_RELOC_386_TLS_GOTDESC
:
316 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
317 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
319 case BFD_RELOC_386_TLS_DESC_CALL
:
320 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
321 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
323 case BFD_RELOC_386_TLS_DESC
:
324 TRACE ("BFD_RELOC_386_TLS_DESC");
325 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
327 case BFD_RELOC_386_IRELATIVE
:
328 TRACE ("BFD_RELOC_386_IRELATIVE");
329 return &elf_howto_table
[R_386_IRELATIVE
- R_386_tls_offset
];
331 case BFD_RELOC_VTABLE_INHERIT
:
332 TRACE ("BFD_RELOC_VTABLE_INHERIT");
333 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
335 case BFD_RELOC_VTABLE_ENTRY
:
336 TRACE ("BFD_RELOC_VTABLE_ENTRY");
337 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
347 static reloc_howto_type
*
348 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
353 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
354 if (elf_howto_table
[i
].name
!= NULL
355 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
356 return &elf_howto_table
[i
];
361 static reloc_howto_type
*
362 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
366 if ((indx
= r_type
) >= R_386_standard
367 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
368 >= R_386_ext
- R_386_standard
)
369 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
370 >= R_386_irelative
- R_386_ext
)
371 && ((indx
= r_type
- R_386_vt_offset
) - R_386_irelative
372 >= R_386_vt
- R_386_irelative
))
374 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
378 BFD_ASSERT (elf_howto_table
[indx
].type
== r_type
);
379 return &elf_howto_table
[indx
];
383 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
385 Elf_Internal_Rela
*dst
)
387 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
388 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
391 /* Return whether a symbol name implies a local label. The UnixWare
392 2.1 cc generates temporary symbols that start with .X, so we
393 recognize them here. FIXME: do other SVR4 compilers also use .X?.
394 If so, we should move the .X recognition into
395 _bfd_elf_is_local_label_name. */
398 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
400 if (name
[0] == '.' && name
[1] == 'X')
403 return _bfd_elf_is_local_label_name (abfd
, name
);
406 /* Support for core dump NOTE sections. */
409 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
414 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
416 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
422 elf_tdata (abfd
)->core_signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
425 elf_tdata (abfd
)->core_lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
429 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
433 switch (note
->descsz
)
438 case 144: /* Linux/i386 */
440 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
443 elf_tdata (abfd
)->core_lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
453 /* Make a ".reg/999" section. */
454 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
455 size
, note
->descpos
+ offset
);
459 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
461 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
463 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
468 elf_tdata (abfd
)->core_program
469 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
470 elf_tdata (abfd
)->core_command
471 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
475 switch (note
->descsz
)
480 case 124: /* Linux/i386 elf_prpsinfo. */
481 elf_tdata (abfd
)->core_pid
482 = bfd_get_32 (abfd
, note
->descdata
+ 12);
483 elf_tdata (abfd
)->core_program
484 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
485 elf_tdata (abfd
)->core_command
486 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
490 /* Note that for some reason, a spurious space is tacked
491 onto the end of the args in some (at least one anyway)
492 implementations, so strip it off if it exists. */
494 char *command
= elf_tdata (abfd
)->core_command
;
495 int n
= strlen (command
);
497 if (0 < n
&& command
[n
- 1] == ' ')
498 command
[n
- 1] = '\0';
504 /* Functions for the i386 ELF linker.
506 In order to gain some understanding of code in this file without
507 knowing all the intricate details of the linker, note the
510 Functions named elf_i386_* are called by external routines, other
511 functions are only called locally. elf_i386_* functions appear
512 in this file more or less in the order in which they are called
513 from external routines. eg. elf_i386_check_relocs is called
514 early in the link process, elf_i386_finish_dynamic_sections is
515 one of the last functions. */
518 /* The name of the dynamic interpreter. This is put in the .interp
521 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
523 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
524 copying dynamic variables from a shared lib into an app's dynbss
525 section, and instead use a dynamic relocation to point into the
527 #define ELIMINATE_COPY_RELOCS 1
529 /* The size in bytes of an entry in the procedure linkage table. */
531 #define PLT_ENTRY_SIZE 16
533 /* The first entry in an absolute procedure linkage table looks like
534 this. See the SVR4 ABI i386 supplement to see how this works.
535 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
537 static const bfd_byte elf_i386_plt0_entry
[12] =
539 0xff, 0x35, /* pushl contents of address */
540 0, 0, 0, 0, /* replaced with address of .got + 4. */
541 0xff, 0x25, /* jmp indirect */
542 0, 0, 0, 0 /* replaced with address of .got + 8. */
545 /* Subsequent entries in an absolute procedure linkage table look like
548 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
550 0xff, 0x25, /* jmp indirect */
551 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
552 0x68, /* pushl immediate */
553 0, 0, 0, 0, /* replaced with offset into relocation table. */
554 0xe9, /* jmp relative */
555 0, 0, 0, 0 /* replaced with offset to start of .plt. */
558 /* The first entry in a PIC procedure linkage table look like this.
559 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
561 static const bfd_byte elf_i386_pic_plt0_entry
[12] =
563 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
564 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
567 /* Subsequent entries in a PIC procedure linkage table look like this. */
569 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
571 0xff, 0xa3, /* jmp *offset(%ebx) */
572 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
573 0x68, /* pushl immediate */
574 0, 0, 0, 0, /* replaced with offset into relocation table. */
575 0xe9, /* jmp relative */
576 0, 0, 0, 0 /* replaced with offset to start of .plt. */
579 /* .eh_frame covering the .plt section. */
581 static const bfd_byte elf_i386_eh_frame_plt
[] =
583 #define PLT_CIE_LENGTH 20
584 #define PLT_FDE_LENGTH 36
585 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
586 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
587 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
588 0, 0, 0, 0, /* CIE ID */
590 'z', 'R', 0, /* Augmentation string */
591 1, /* Code alignment factor */
592 0x7c, /* Data alignment factor */
593 8, /* Return address column */
594 1, /* Augmentation size */
595 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
596 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
597 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
598 DW_CFA_nop
, DW_CFA_nop
,
600 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
601 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
602 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
603 0, 0, 0, 0, /* .plt size goes here */
604 0, /* Augmentation size */
605 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
606 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
607 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
608 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
609 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
610 11, /* Block length */
611 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
612 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
613 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
614 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
615 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
618 struct elf_i386_plt_layout
620 /* The first entry in an absolute procedure linkage table looks like this. */
621 const bfd_byte
*plt0_entry
;
622 unsigned int plt0_entry_size
;
624 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
625 unsigned int plt0_got1_offset
;
626 unsigned int plt0_got2_offset
;
628 /* Later entries in an absolute procedure linkage table look like this. */
629 const bfd_byte
*plt_entry
;
630 unsigned int plt_entry_size
;
632 /* Offsets into plt_entry that are to be replaced with... */
633 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
634 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
635 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
637 /* Offset into plt_entry where the initial value of the GOT entry points. */
638 unsigned int plt_lazy_offset
;
640 /* The first entry in a PIC procedure linkage table looks like this. */
641 const bfd_byte
*pic_plt0_entry
;
643 /* Subsequent entries in a PIC procedure linkage table look like this. */
644 const bfd_byte
*pic_plt_entry
;
646 /* .eh_frame covering the .plt section. */
647 const bfd_byte
*eh_frame_plt
;
648 unsigned int eh_frame_plt_size
;
651 #define GET_PLT_ENTRY_SIZE(abfd) \
652 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
654 /* These are the standard parameters. */
655 static const struct elf_i386_plt_layout elf_i386_plt
=
657 elf_i386_plt0_entry
, /* plt0_entry */
658 sizeof (elf_i386_plt0_entry
), /* plt0_entry_size */
659 2, /* plt0_got1_offset */
660 8, /* plt0_got2_offset */
661 elf_i386_plt_entry
, /* plt_entry */
662 PLT_ENTRY_SIZE
, /* plt_entry_size */
663 2, /* plt_got_offset */
664 7, /* plt_reloc_offset */
665 12, /* plt_plt_offset */
666 6, /* plt_lazy_offset */
667 elf_i386_pic_plt0_entry
, /* pic_plt0_entry */
668 elf_i386_pic_plt_entry
, /* pic_plt_entry */
669 elf_i386_eh_frame_plt
, /* eh_frame_plt */
670 sizeof (elf_i386_eh_frame_plt
), /* eh_frame_plt_size */
674 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
675 for the PLTResolve stub and then for each PLT entry. */
676 #define PLTRESOLVE_RELOCS_SHLIB 0
677 #define PLTRESOLVE_RELOCS 2
678 #define PLT_NON_JUMP_SLOT_RELOCS 2
680 /* Architecture-specific backend data for i386. */
682 struct elf_i386_backend_data
684 /* Parameters describing PLT generation. */
685 const struct elf_i386_plt_layout
*plt
;
687 /* Value used to fill the unused bytes of the first PLT entry. */
688 bfd_byte plt0_pad_byte
;
690 /* True if the target system is VxWorks. */
694 #define get_elf_i386_backend_data(abfd) \
695 ((const struct elf_i386_backend_data *) \
696 get_elf_backend_data (abfd)->arch_data)
698 /* These are the standard parameters. */
699 static const struct elf_i386_backend_data elf_i386_arch_bed
=
701 &elf_i386_plt
, /* plt */
702 0, /* plt0_pad_byte */
706 #define elf_backend_arch_data &elf_i386_arch_bed
708 /* i386 ELF linker hash entry. */
710 struct elf_i386_link_hash_entry
712 struct elf_link_hash_entry elf
;
714 /* Track dynamic relocs copied for this symbol. */
715 struct elf_dyn_relocs
*dyn_relocs
;
717 #define GOT_UNKNOWN 0
721 #define GOT_TLS_IE_POS 5
722 #define GOT_TLS_IE_NEG 6
723 #define GOT_TLS_IE_BOTH 7
724 #define GOT_TLS_GDESC 8
725 #define GOT_TLS_GD_BOTH_P(type) \
726 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
727 #define GOT_TLS_GD_P(type) \
728 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
729 #define GOT_TLS_GDESC_P(type) \
730 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
731 #define GOT_TLS_GD_ANY_P(type) \
732 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
733 unsigned char tls_type
;
735 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
736 starting at the end of the jump table. */
740 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
742 struct elf_i386_obj_tdata
744 struct elf_obj_tdata root
;
746 /* tls_type for each local got entry. */
747 char *local_got_tls_type
;
749 /* GOTPLT entries for TLS descriptors. */
750 bfd_vma
*local_tlsdesc_gotent
;
753 #define elf_i386_tdata(abfd) \
754 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
756 #define elf_i386_local_got_tls_type(abfd) \
757 (elf_i386_tdata (abfd)->local_got_tls_type)
759 #define elf_i386_local_tlsdesc_gotent(abfd) \
760 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
762 #define is_i386_elf(bfd) \
763 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
764 && elf_tdata (bfd) != NULL \
765 && elf_object_id (bfd) == I386_ELF_DATA)
768 elf_i386_mkobject (bfd
*abfd
)
770 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_i386_obj_tdata
),
774 /* i386 ELF linker hash table. */
776 struct elf_i386_link_hash_table
778 struct elf_link_hash_table elf
;
780 /* Short-cuts to get to dynamic linker sections. */
783 asection
*plt_eh_frame
;
787 bfd_signed_vma refcount
;
791 /* The amount of space used by the reserved portion of the sgotplt
792 section, plus whatever space is used by the jump slots. */
793 bfd_vma sgotplt_jump_table_size
;
795 /* Small local sym cache. */
796 struct sym_cache sym_cache
;
798 /* _TLS_MODULE_BASE_ symbol. */
799 struct bfd_link_hash_entry
*tls_module_base
;
801 /* Used by local STT_GNU_IFUNC symbols. */
802 htab_t loc_hash_table
;
803 void * loc_hash_memory
;
805 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
808 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
809 bfd_vma next_tls_desc_index
;
811 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
812 bfd_vma next_jump_slot_index
;
814 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
815 bfd_vma next_irelative_index
;
818 /* Get the i386 ELF linker hash table from a link_info structure. */
820 #define elf_i386_hash_table(p) \
821 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
822 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
824 #define elf_i386_compute_jump_table_size(htab) \
825 ((htab)->next_tls_desc_index * 4)
827 /* Create an entry in an i386 ELF linker hash table. */
829 static struct bfd_hash_entry
*
830 elf_i386_link_hash_newfunc (struct bfd_hash_entry
*entry
,
831 struct bfd_hash_table
*table
,
834 /* Allocate the structure if it has not already been allocated by a
838 entry
= (struct bfd_hash_entry
*)
839 bfd_hash_allocate (table
, sizeof (struct elf_i386_link_hash_entry
));
844 /* Call the allocation method of the superclass. */
845 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
848 struct elf_i386_link_hash_entry
*eh
;
850 eh
= (struct elf_i386_link_hash_entry
*) entry
;
851 eh
->dyn_relocs
= NULL
;
852 eh
->tls_type
= GOT_UNKNOWN
;
853 eh
->tlsdesc_got
= (bfd_vma
) -1;
859 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
860 for local symbol so that we can handle local STT_GNU_IFUNC symbols
861 as global symbol. We reuse indx and dynstr_index for local symbol
862 hash since they aren't used by global symbols in this backend. */
865 elf_i386_local_htab_hash (const void *ptr
)
867 struct elf_link_hash_entry
*h
868 = (struct elf_link_hash_entry
*) ptr
;
869 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
872 /* Compare local hash entries. */
875 elf_i386_local_htab_eq (const void *ptr1
, const void *ptr2
)
877 struct elf_link_hash_entry
*h1
878 = (struct elf_link_hash_entry
*) ptr1
;
879 struct elf_link_hash_entry
*h2
880 = (struct elf_link_hash_entry
*) ptr2
;
882 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
885 /* Find and/or create a hash entry for local symbol. */
887 static struct elf_link_hash_entry
*
888 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table
*htab
,
889 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
892 struct elf_i386_link_hash_entry e
, *ret
;
893 asection
*sec
= abfd
->sections
;
894 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
895 ELF32_R_SYM (rel
->r_info
));
898 e
.elf
.indx
= sec
->id
;
899 e
.elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
900 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
901 create
? INSERT
: NO_INSERT
);
908 ret
= (struct elf_i386_link_hash_entry
*) *slot
;
912 ret
= (struct elf_i386_link_hash_entry
*)
913 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
914 sizeof (struct elf_i386_link_hash_entry
));
917 memset (ret
, 0, sizeof (*ret
));
918 ret
->elf
.indx
= sec
->id
;
919 ret
->elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
920 ret
->elf
.dynindx
= -1;
926 /* Create an i386 ELF linker hash table. */
928 static struct bfd_link_hash_table
*
929 elf_i386_link_hash_table_create (bfd
*abfd
)
931 struct elf_i386_link_hash_table
*ret
;
932 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
934 ret
= (struct elf_i386_link_hash_table
*) bfd_malloc (amt
);
938 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
939 elf_i386_link_hash_newfunc
,
940 sizeof (struct elf_i386_link_hash_entry
),
949 ret
->plt_eh_frame
= NULL
;
950 ret
->tls_ldm_got
.refcount
= 0;
951 ret
->next_tls_desc_index
= 0;
952 ret
->sgotplt_jump_table_size
= 0;
953 ret
->sym_cache
.abfd
= NULL
;
954 ret
->srelplt2
= NULL
;
955 ret
->tls_module_base
= NULL
;
956 ret
->next_jump_slot_index
= 0;
957 ret
->next_irelative_index
= 0;
959 ret
->loc_hash_table
= htab_try_create (1024,
960 elf_i386_local_htab_hash
,
961 elf_i386_local_htab_eq
,
963 ret
->loc_hash_memory
= objalloc_create ();
964 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
970 return &ret
->elf
.root
;
973 /* Destroy an i386 ELF linker hash table. */
976 elf_i386_link_hash_table_free (struct bfd_link_hash_table
*hash
)
978 struct elf_i386_link_hash_table
*htab
979 = (struct elf_i386_link_hash_table
*) hash
;
981 if (htab
->loc_hash_table
)
982 htab_delete (htab
->loc_hash_table
);
983 if (htab
->loc_hash_memory
)
984 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
985 _bfd_generic_link_hash_table_free (hash
);
988 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
989 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
993 elf_i386_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
995 struct elf_i386_link_hash_table
*htab
;
997 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1000 htab
= elf_i386_hash_table (info
);
1004 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
1006 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
1009 || (!info
->shared
&& !htab
->srelbss
))
1012 if (get_elf_i386_backend_data (dynobj
)->is_vxworks
1013 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
1017 if (!info
->no_ld_generated_unwind_info
1018 && bfd_get_section_by_name (dynobj
, ".eh_frame") == NULL
1019 && htab
->elf
.splt
!= NULL
)
1021 flagword flags
= get_elf_backend_data (dynobj
)->dynamic_sec_flags
;
1023 = bfd_make_section_with_flags (dynobj
, ".eh_frame",
1024 flags
| SEC_READONLY
);
1025 if (htab
->plt_eh_frame
== NULL
1026 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 2))
1029 htab
->plt_eh_frame
->size
= sizeof (elf_i386_eh_frame_plt
);
1030 htab
->plt_eh_frame
->contents
1031 = bfd_alloc (dynobj
, htab
->plt_eh_frame
->size
);
1032 memcpy (htab
->plt_eh_frame
->contents
, elf_i386_eh_frame_plt
,
1033 sizeof (elf_i386_eh_frame_plt
));
1039 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1042 elf_i386_copy_indirect_symbol (struct bfd_link_info
*info
,
1043 struct elf_link_hash_entry
*dir
,
1044 struct elf_link_hash_entry
*ind
)
1046 struct elf_i386_link_hash_entry
*edir
, *eind
;
1048 edir
= (struct elf_i386_link_hash_entry
*) dir
;
1049 eind
= (struct elf_i386_link_hash_entry
*) ind
;
1051 if (eind
->dyn_relocs
!= NULL
)
1053 if (edir
->dyn_relocs
!= NULL
)
1055 struct elf_dyn_relocs
**pp
;
1056 struct elf_dyn_relocs
*p
;
1058 /* Add reloc counts against the indirect sym to the direct sym
1059 list. Merge any entries against the same section. */
1060 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1062 struct elf_dyn_relocs
*q
;
1064 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1065 if (q
->sec
== p
->sec
)
1067 q
->pc_count
+= p
->pc_count
;
1068 q
->count
+= p
->count
;
1075 *pp
= edir
->dyn_relocs
;
1078 edir
->dyn_relocs
= eind
->dyn_relocs
;
1079 eind
->dyn_relocs
= NULL
;
1082 if (ind
->root
.type
== bfd_link_hash_indirect
1083 && dir
->got
.refcount
<= 0)
1085 edir
->tls_type
= eind
->tls_type
;
1086 eind
->tls_type
= GOT_UNKNOWN
;
1089 if (ELIMINATE_COPY_RELOCS
1090 && ind
->root
.type
!= bfd_link_hash_indirect
1091 && dir
->dynamic_adjusted
)
1093 /* If called to transfer flags for a weakdef during processing
1094 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1095 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1096 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1097 dir
->ref_regular
|= ind
->ref_regular
;
1098 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1099 dir
->needs_plt
|= ind
->needs_plt
;
1100 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1103 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1106 /* Return TRUE if the TLS access code sequence support transition
1110 elf_i386_check_tls_transition (bfd
*abfd
, asection
*sec
,
1112 Elf_Internal_Shdr
*symtab_hdr
,
1113 struct elf_link_hash_entry
**sym_hashes
,
1114 unsigned int r_type
,
1115 const Elf_Internal_Rela
*rel
,
1116 const Elf_Internal_Rela
*relend
)
1118 unsigned int val
, type
;
1119 unsigned long r_symndx
;
1120 struct elf_link_hash_entry
*h
;
1123 /* Get the section contents. */
1124 if (contents
== NULL
)
1126 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1127 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1130 /* FIXME: How to better handle error condition? */
1131 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1134 /* Cache the section contents for elf_link_input_bfd. */
1135 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1139 offset
= rel
->r_offset
;
1144 if (offset
< 2 || (rel
+ 1) >= relend
)
1147 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1148 if (r_type
== R_386_TLS_GD
)
1150 /* Check transition from GD access model. Only
1151 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1152 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1153 can transit to different access model. */
1154 if ((offset
+ 10) > sec
->size
||
1155 (type
!= 0x8d && type
!= 0x04))
1158 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1161 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1165 if (bfd_get_8 (abfd
, contents
+ offset
- 3) != 0x8d)
1168 if ((val
& 0xc7) != 0x05 || val
== (4 << 3))
1173 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1174 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1177 if (bfd_get_8 (abfd
, contents
+ offset
+ 9) != 0x90)
1183 /* Check transition from LD access model. Only
1184 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1185 can transit to different access model. */
1186 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
1189 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1190 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1194 if (bfd_get_8 (abfd
, contents
+ offset
+ 4) != 0xe8)
1197 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
1198 if (r_symndx
< symtab_hdr
->sh_info
)
1201 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1202 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1203 may be versioned. */
1205 && h
->root
.root
.string
!= NULL
1206 && (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
1207 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
)
1208 && (strncmp (h
->root
.root
.string
, "___tls_get_addr",
1212 /* Check transition from IE access model:
1213 movl foo@indntpoff(%rip), %eax
1214 movl foo@indntpoff(%rip), %reg
1215 addl foo@indntpoff(%rip), %reg
1218 if (offset
< 1 || (offset
+ 4) > sec
->size
)
1221 /* Check "movl foo@tpoff(%rip), %eax" first. */
1222 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1229 /* Check movl|addl foo@tpoff(%rip), %reg. */
1230 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1231 return ((type
== 0x8b || type
== 0x03)
1232 && (val
& 0xc7) == 0x05);
1234 case R_386_TLS_GOTIE
:
1235 case R_386_TLS_IE_32
:
1236 /* Check transition from {IE_32,GOTIE} access model:
1237 subl foo@{tpoff,gontoff}(%reg1), %reg2
1238 movl foo@{tpoff,gontoff}(%reg1), %reg2
1239 addl foo@{tpoff,gontoff}(%reg1), %reg2
1242 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1245 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1246 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1249 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1250 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1252 case R_386_TLS_GOTDESC
:
1253 /* Check transition from GDesc access model:
1254 leal x@tlsdesc(%ebx), %eax
1256 Make sure it's a leal adding ebx to a 32-bit offset
1257 into any register, although it's probably almost always
1260 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1263 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1266 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1267 return (val
& 0xc7) == 0x83;
1269 case R_386_TLS_DESC_CALL
:
1270 /* Check transition from GDesc access model:
1271 call *x@tlsdesc(%rax)
1273 if (offset
+ 2 <= sec
->size
)
1275 /* Make sure that it's a call *x@tlsdesc(%rax). */
1276 static const unsigned char call
[] = { 0xff, 0x10 };
1277 return memcmp (contents
+ offset
, call
, 2) == 0;
1287 /* Return TRUE if the TLS access transition is OK or no transition
1288 will be performed. Update R_TYPE if there is a transition. */
1291 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1292 asection
*sec
, bfd_byte
*contents
,
1293 Elf_Internal_Shdr
*symtab_hdr
,
1294 struct elf_link_hash_entry
**sym_hashes
,
1295 unsigned int *r_type
, int tls_type
,
1296 const Elf_Internal_Rela
*rel
,
1297 const Elf_Internal_Rela
*relend
,
1298 struct elf_link_hash_entry
*h
,
1299 unsigned long r_symndx
)
1301 unsigned int from_type
= *r_type
;
1302 unsigned int to_type
= from_type
;
1303 bfd_boolean check
= TRUE
;
1305 /* Skip TLS transition for functions. */
1307 && (h
->type
== STT_FUNC
1308 || h
->type
== STT_GNU_IFUNC
))
1314 case R_386_TLS_GOTDESC
:
1315 case R_386_TLS_DESC_CALL
:
1316 case R_386_TLS_IE_32
:
1318 case R_386_TLS_GOTIE
:
1319 if (info
->executable
)
1322 to_type
= R_386_TLS_LE_32
;
1323 else if (from_type
!= R_386_TLS_IE
1324 && from_type
!= R_386_TLS_GOTIE
)
1325 to_type
= R_386_TLS_IE_32
;
1328 /* When we are called from elf_i386_relocate_section, CONTENTS
1329 isn't NULL and there may be additional transitions based on
1331 if (contents
!= NULL
)
1333 unsigned int new_to_type
= to_type
;
1335 if (info
->executable
1338 && (tls_type
& GOT_TLS_IE
))
1339 new_to_type
= R_386_TLS_LE_32
;
1341 if (to_type
== R_386_TLS_GD
1342 || to_type
== R_386_TLS_GOTDESC
1343 || to_type
== R_386_TLS_DESC_CALL
)
1345 if (tls_type
== GOT_TLS_IE_POS
)
1346 new_to_type
= R_386_TLS_GOTIE
;
1347 else if (tls_type
& GOT_TLS_IE
)
1348 new_to_type
= R_386_TLS_IE_32
;
1351 /* We checked the transition before when we were called from
1352 elf_i386_check_relocs. We only want to check the new
1353 transition which hasn't been checked before. */
1354 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1355 to_type
= new_to_type
;
1361 if (info
->executable
)
1362 to_type
= R_386_TLS_LE_32
;
1369 /* Return TRUE if there is no transition. */
1370 if (from_type
== to_type
)
1373 /* Check if the transition can be performed. */
1375 && ! elf_i386_check_tls_transition (abfd
, sec
, contents
,
1376 symtab_hdr
, sym_hashes
,
1377 from_type
, rel
, relend
))
1379 reloc_howto_type
*from
, *to
;
1382 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1383 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1386 name
= h
->root
.root
.string
;
1389 struct elf_i386_link_hash_table
*htab
;
1391 htab
= elf_i386_hash_table (info
);
1396 Elf_Internal_Sym
*isym
;
1398 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1400 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1404 (*_bfd_error_handler
)
1405 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1406 "in section `%A' failed"),
1407 abfd
, sec
, from
->name
, to
->name
, name
,
1408 (unsigned long) rel
->r_offset
);
1409 bfd_set_error (bfd_error_bad_value
);
1417 /* Look through the relocs for a section during the first phase, and
1418 calculate needed space in the global offset table, procedure linkage
1419 table, and dynamic reloc sections. */
1422 elf_i386_check_relocs (bfd
*abfd
,
1423 struct bfd_link_info
*info
,
1425 const Elf_Internal_Rela
*relocs
)
1427 struct elf_i386_link_hash_table
*htab
;
1428 Elf_Internal_Shdr
*symtab_hdr
;
1429 struct elf_link_hash_entry
**sym_hashes
;
1430 const Elf_Internal_Rela
*rel
;
1431 const Elf_Internal_Rela
*rel_end
;
1434 if (info
->relocatable
)
1437 BFD_ASSERT (is_i386_elf (abfd
));
1439 htab
= elf_i386_hash_table (info
);
1443 symtab_hdr
= &elf_symtab_hdr (abfd
);
1444 sym_hashes
= elf_sym_hashes (abfd
);
1448 rel_end
= relocs
+ sec
->reloc_count
;
1449 for (rel
= relocs
; rel
< rel_end
; rel
++)
1451 unsigned int r_type
;
1452 unsigned long r_symndx
;
1453 struct elf_link_hash_entry
*h
;
1454 Elf_Internal_Sym
*isym
;
1457 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1458 r_type
= ELF32_R_TYPE (rel
->r_info
);
1460 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1462 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1468 if (r_symndx
< symtab_hdr
->sh_info
)
1470 /* A local symbol. */
1471 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1476 /* Check relocation against local STT_GNU_IFUNC symbol. */
1477 if (ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1479 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
, TRUE
);
1483 /* Fake a STT_GNU_IFUNC symbol. */
1484 h
->type
= STT_GNU_IFUNC
;
1487 h
->forced_local
= 1;
1488 h
->root
.type
= bfd_link_hash_defined
;
1496 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1497 while (h
->root
.type
== bfd_link_hash_indirect
1498 || h
->root
.type
== bfd_link_hash_warning
)
1499 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1504 /* Create the ifunc sections for static executables. If we
1505 never see an indirect function symbol nor we are building
1506 a static executable, those sections will be empty and
1507 won't appear in output. */
1518 if (htab
->elf
.dynobj
== NULL
)
1519 htab
->elf
.dynobj
= abfd
;
1520 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1525 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1526 it here if it is defined in a non-shared object. */
1527 if (h
->type
== STT_GNU_IFUNC
1530 /* It is referenced by a non-shared object. */
1534 /* STT_GNU_IFUNC symbol must go through PLT. */
1535 h
->plt
.refcount
+= 1;
1537 /* STT_GNU_IFUNC needs dynamic sections. */
1538 if (htab
->elf
.dynobj
== NULL
)
1539 htab
->elf
.dynobj
= abfd
;
1544 if (h
->root
.root
.string
)
1545 name
= h
->root
.root
.string
;
1547 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1549 (*_bfd_error_handler
)
1550 (_("%B: relocation %s against STT_GNU_IFUNC "
1551 "symbol `%s' isn't handled by %s"), abfd
,
1552 elf_howto_table
[r_type
].name
,
1553 name
, __FUNCTION__
);
1554 bfd_set_error (bfd_error_bad_value
);
1559 h
->pointer_equality_needed
= 1;
1562 /* We must copy these reloc types into the
1563 output file. Create a reloc section in
1564 dynobj and make room for this reloc. */
1565 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1566 (abfd
, info
, sec
, sreloc
,
1567 &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
);
1582 h
->got
.refcount
+= 1;
1583 if (htab
->elf
.sgot
== NULL
1584 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1594 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1595 symtab_hdr
, sym_hashes
,
1596 &r_type
, GOT_UNKNOWN
,
1597 rel
, rel_end
, h
, r_symndx
))
1603 htab
->tls_ldm_got
.refcount
+= 1;
1607 /* This symbol requires a procedure linkage table entry. We
1608 actually build the entry in adjust_dynamic_symbol,
1609 because this might be a case of linking PIC code which is
1610 never referenced by a dynamic object, in which case we
1611 don't need to generate a procedure linkage table entry
1614 /* If this is a local symbol, we resolve it directly without
1615 creating a procedure linkage table entry. */
1620 h
->plt
.refcount
+= 1;
1623 case R_386_TLS_IE_32
:
1625 case R_386_TLS_GOTIE
:
1626 if (!info
->executable
)
1627 info
->flags
|= DF_STATIC_TLS
;
1632 case R_386_TLS_GOTDESC
:
1633 case R_386_TLS_DESC_CALL
:
1634 /* This symbol requires a global offset table entry. */
1636 int tls_type
, old_tls_type
;
1641 case R_386_GOT32
: tls_type
= GOT_NORMAL
; break;
1642 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
1643 case R_386_TLS_GOTDESC
:
1644 case R_386_TLS_DESC_CALL
:
1645 tls_type
= GOT_TLS_GDESC
; break;
1646 case R_386_TLS_IE_32
:
1647 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
1648 tls_type
= GOT_TLS_IE_NEG
;
1650 /* If this is a GD->IE transition, we may use either of
1651 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1652 tls_type
= GOT_TLS_IE
;
1655 case R_386_TLS_GOTIE
:
1656 tls_type
= GOT_TLS_IE_POS
; break;
1661 h
->got
.refcount
+= 1;
1662 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1666 bfd_signed_vma
*local_got_refcounts
;
1668 /* This is a global offset table entry for a local symbol. */
1669 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1670 if (local_got_refcounts
== NULL
)
1674 size
= symtab_hdr
->sh_info
;
1675 size
*= (sizeof (bfd_signed_vma
)
1676 + sizeof (bfd_vma
) + sizeof(char));
1677 local_got_refcounts
= (bfd_signed_vma
*)
1678 bfd_zalloc (abfd
, size
);
1679 if (local_got_refcounts
== NULL
)
1681 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1682 elf_i386_local_tlsdesc_gotent (abfd
)
1683 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1684 elf_i386_local_got_tls_type (abfd
)
1685 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1687 local_got_refcounts
[r_symndx
] += 1;
1688 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
1691 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1692 tls_type
|= old_tls_type
;
1693 /* If a TLS symbol is accessed using IE at least once,
1694 there is no point to use dynamic model for it. */
1695 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1696 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1697 || (tls_type
& GOT_TLS_IE
) == 0))
1699 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
1700 tls_type
= old_tls_type
;
1701 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1702 && GOT_TLS_GD_ANY_P (tls_type
))
1703 tls_type
|= old_tls_type
;
1707 name
= h
->root
.root
.string
;
1709 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1711 (*_bfd_error_handler
)
1712 (_("%B: `%s' accessed both as normal and "
1713 "thread local symbol"),
1719 if (old_tls_type
!= tls_type
)
1722 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
1724 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1732 if (htab
->elf
.sgot
== NULL
)
1734 if (htab
->elf
.dynobj
== NULL
)
1735 htab
->elf
.dynobj
= abfd
;
1736 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
, info
))
1739 if (r_type
!= R_386_TLS_IE
)
1743 case R_386_TLS_LE_32
:
1745 if (info
->executable
)
1747 info
->flags
|= DF_STATIC_TLS
;
1752 if (h
!= NULL
&& info
->executable
)
1754 /* If this reloc is in a read-only section, we might
1755 need a copy reloc. We can't check reliably at this
1756 stage whether the section is read-only, as input
1757 sections have not yet been mapped to output sections.
1758 Tentatively set the flag for now, and correct in
1759 adjust_dynamic_symbol. */
1762 /* We may need a .plt entry if the function this reloc
1763 refers to is in a shared lib. */
1764 h
->plt
.refcount
+= 1;
1765 if (r_type
!= R_386_PC32
)
1766 h
->pointer_equality_needed
= 1;
1769 /* If we are creating a shared library, and this is a reloc
1770 against a global symbol, or a non PC relative reloc
1771 against a local symbol, then we need to copy the reloc
1772 into the shared library. However, if we are linking with
1773 -Bsymbolic, we do not need to copy a reloc against a
1774 global symbol which is defined in an object we are
1775 including in the link (i.e., DEF_REGULAR is set). At
1776 this point we have not seen all the input files, so it is
1777 possible that DEF_REGULAR is not set now but will be set
1778 later (it is never cleared). In case of a weak definition,
1779 DEF_REGULAR may be cleared later by a strong definition in
1780 a shared library. We account for that possibility below by
1781 storing information in the relocs_copied field of the hash
1782 table entry. A similar situation occurs when creating
1783 shared libraries and symbol visibility changes render the
1786 If on the other hand, we are creating an executable, we
1787 may need to keep relocations for symbols satisfied by a
1788 dynamic library if we manage to avoid copy relocs for the
1791 && (sec
->flags
& SEC_ALLOC
) != 0
1792 && (r_type
!= R_386_PC32
1794 && (! SYMBOLIC_BIND (info
, h
)
1795 || h
->root
.type
== bfd_link_hash_defweak
1796 || !h
->def_regular
))))
1797 || (ELIMINATE_COPY_RELOCS
1799 && (sec
->flags
& SEC_ALLOC
) != 0
1801 && (h
->root
.type
== bfd_link_hash_defweak
1802 || !h
->def_regular
)))
1804 struct elf_dyn_relocs
*p
;
1805 struct elf_dyn_relocs
**head
;
1807 /* We must copy these reloc types into the output file.
1808 Create a reloc section in dynobj and make room for
1812 if (htab
->elf
.dynobj
== NULL
)
1813 htab
->elf
.dynobj
= abfd
;
1815 sreloc
= _bfd_elf_make_dynamic_reloc_section
1816 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
1822 /* If this is a global symbol, we count the number of
1823 relocations we need for this symbol. */
1826 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1830 /* Track dynamic relocs needed for local syms too.
1831 We really need local syms available to do this
1836 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1841 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1845 vpp
= &elf_section_data (s
)->local_dynrel
;
1846 head
= (struct elf_dyn_relocs
**)vpp
;
1850 if (p
== NULL
|| p
->sec
!= sec
)
1852 bfd_size_type amt
= sizeof *p
;
1853 p
= (struct elf_dyn_relocs
*) bfd_alloc (htab
->elf
.dynobj
,
1865 if (r_type
== R_386_PC32
)
1870 /* This relocation describes the C++ object vtable hierarchy.
1871 Reconstruct it for later use during GC. */
1872 case R_386_GNU_VTINHERIT
:
1873 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1877 /* This relocation describes which C++ vtable entries are actually
1878 used. Record for later use during GC. */
1879 case R_386_GNU_VTENTRY
:
1880 BFD_ASSERT (h
!= NULL
);
1882 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1894 /* Return the section that should be marked against GC for a given
1898 elf_i386_gc_mark_hook (asection
*sec
,
1899 struct bfd_link_info
*info
,
1900 Elf_Internal_Rela
*rel
,
1901 struct elf_link_hash_entry
*h
,
1902 Elf_Internal_Sym
*sym
)
1905 switch (ELF32_R_TYPE (rel
->r_info
))
1907 case R_386_GNU_VTINHERIT
:
1908 case R_386_GNU_VTENTRY
:
1912 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1915 /* Update the got entry reference counts for the section being removed. */
1918 elf_i386_gc_sweep_hook (bfd
*abfd
,
1919 struct bfd_link_info
*info
,
1921 const Elf_Internal_Rela
*relocs
)
1923 struct elf_i386_link_hash_table
*htab
;
1924 Elf_Internal_Shdr
*symtab_hdr
;
1925 struct elf_link_hash_entry
**sym_hashes
;
1926 bfd_signed_vma
*local_got_refcounts
;
1927 const Elf_Internal_Rela
*rel
, *relend
;
1929 if (info
->relocatable
)
1932 htab
= elf_i386_hash_table (info
);
1936 elf_section_data (sec
)->local_dynrel
= NULL
;
1938 symtab_hdr
= &elf_symtab_hdr (abfd
);
1939 sym_hashes
= elf_sym_hashes (abfd
);
1940 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1942 relend
= relocs
+ sec
->reloc_count
;
1943 for (rel
= relocs
; rel
< relend
; rel
++)
1945 unsigned long r_symndx
;
1946 unsigned int r_type
;
1947 struct elf_link_hash_entry
*h
= NULL
;
1949 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1950 if (r_symndx
>= symtab_hdr
->sh_info
)
1952 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1953 while (h
->root
.type
== bfd_link_hash_indirect
1954 || h
->root
.type
== bfd_link_hash_warning
)
1955 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1959 /* A local symbol. */
1960 Elf_Internal_Sym
*isym
;
1962 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1965 /* Check relocation against local STT_GNU_IFUNC symbol. */
1967 && ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1969 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
1977 struct elf_i386_link_hash_entry
*eh
;
1978 struct elf_dyn_relocs
**pp
;
1979 struct elf_dyn_relocs
*p
;
1981 eh
= (struct elf_i386_link_hash_entry
*) h
;
1982 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1985 /* Everything must go for SEC. */
1991 r_type
= ELF32_R_TYPE (rel
->r_info
);
1992 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1993 symtab_hdr
, sym_hashes
,
1994 &r_type
, GOT_UNKNOWN
,
1995 rel
, relend
, h
, r_symndx
))
2001 if (htab
->tls_ldm_got
.refcount
> 0)
2002 htab
->tls_ldm_got
.refcount
-= 1;
2006 case R_386_TLS_GOTDESC
:
2007 case R_386_TLS_DESC_CALL
:
2008 case R_386_TLS_IE_32
:
2010 case R_386_TLS_GOTIE
:
2014 if (h
->got
.refcount
> 0)
2015 h
->got
.refcount
-= 1;
2016 if (h
->type
== STT_GNU_IFUNC
)
2018 if (h
->plt
.refcount
> 0)
2019 h
->plt
.refcount
-= 1;
2022 else if (local_got_refcounts
!= NULL
)
2024 if (local_got_refcounts
[r_symndx
] > 0)
2025 local_got_refcounts
[r_symndx
] -= 1;
2032 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2039 if (h
->plt
.refcount
> 0)
2040 h
->plt
.refcount
-= 1;
2045 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
2047 if (h
->got
.refcount
> 0)
2048 h
->got
.refcount
-= 1;
2049 if (h
->plt
.refcount
> 0)
2050 h
->plt
.refcount
-= 1;
2062 /* Adjust a symbol defined by a dynamic object and referenced by a
2063 regular object. The current definition is in some section of the
2064 dynamic object, but we're not including those sections. We have to
2065 change the definition to something the rest of the link can
2069 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2070 struct elf_link_hash_entry
*h
)
2072 struct elf_i386_link_hash_table
*htab
;
2075 /* STT_GNU_IFUNC symbol must go through PLT. */
2076 if (h
->type
== STT_GNU_IFUNC
)
2078 if (h
->plt
.refcount
<= 0)
2080 h
->plt
.offset
= (bfd_vma
) -1;
2086 /* If this is a function, put it in the procedure linkage table. We
2087 will fill in the contents of the procedure linkage table later,
2088 when we know the address of the .got section. */
2089 if (h
->type
== STT_FUNC
2092 if (h
->plt
.refcount
<= 0
2093 || SYMBOL_CALLS_LOCAL (info
, h
)
2094 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2095 && h
->root
.type
== bfd_link_hash_undefweak
))
2097 /* This case can occur if we saw a PLT32 reloc in an input
2098 file, but the symbol was never referred to by a dynamic
2099 object, or if all references were garbage collected. In
2100 such a case, we don't actually need to build a procedure
2101 linkage table, and we can just do a PC32 reloc instead. */
2102 h
->plt
.offset
= (bfd_vma
) -1;
2109 /* It's possible that we incorrectly decided a .plt reloc was
2110 needed for an R_386_PC32 reloc to a non-function sym in
2111 check_relocs. We can't decide accurately between function and
2112 non-function syms in check-relocs; Objects loaded later in
2113 the link may change h->type. So fix it now. */
2114 h
->plt
.offset
= (bfd_vma
) -1;
2116 /* If this is a weak symbol, and there is a real definition, the
2117 processor independent code will have arranged for us to see the
2118 real definition first, and we can just use the same value. */
2119 if (h
->u
.weakdef
!= NULL
)
2121 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2122 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2123 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2124 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2125 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2126 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2130 /* This is a reference to a symbol defined by a dynamic object which
2131 is not a function. */
2133 /* If we are creating a shared library, we must presume that the
2134 only references to the symbol are via the global offset table.
2135 For such cases we need not do anything here; the relocations will
2136 be handled correctly by relocate_section. */
2140 /* If there are no references to this symbol that do not use the
2141 GOT, we don't need to generate a copy reloc. */
2142 if (!h
->non_got_ref
)
2145 /* If -z nocopyreloc was given, we won't generate them either. */
2146 if (info
->nocopyreloc
)
2152 htab
= elf_i386_hash_table (info
);
2156 /* If there aren't any dynamic relocs in read-only sections, then
2157 we can keep the dynamic relocs and avoid the copy reloc. This
2158 doesn't work on VxWorks, where we can not have dynamic relocations
2159 (other than copy and jump slot relocations) in an executable. */
2160 if (ELIMINATE_COPY_RELOCS
2161 && !get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
)
2163 struct elf_i386_link_hash_entry
* eh
;
2164 struct elf_dyn_relocs
*p
;
2166 eh
= (struct elf_i386_link_hash_entry
*) h
;
2167 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2169 s
= p
->sec
->output_section
;
2170 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2181 /* We must allocate the symbol in our .dynbss section, which will
2182 become part of the .bss section of the executable. There will be
2183 an entry for this symbol in the .dynsym section. The dynamic
2184 object will contain position independent code, so all references
2185 from the dynamic object to this symbol will go through the global
2186 offset table. The dynamic linker will use the .dynsym entry to
2187 determine the address it must put in the global offset table, so
2188 both the dynamic object and the regular object will refer to the
2189 same memory location for the variable. */
2191 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2192 copy the initial value out of the dynamic object and into the
2193 runtime process image. */
2194 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2196 htab
->srelbss
->size
+= sizeof (Elf32_External_Rel
);
2202 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2205 /* Allocate space in .plt, .got and associated reloc sections for
2209 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2211 struct bfd_link_info
*info
;
2212 struct elf_i386_link_hash_table
*htab
;
2213 struct elf_i386_link_hash_entry
*eh
;
2214 struct elf_dyn_relocs
*p
;
2215 unsigned plt_entry_size
;
2217 if (h
->root
.type
== bfd_link_hash_indirect
)
2220 eh
= (struct elf_i386_link_hash_entry
*) h
;
2222 info
= (struct bfd_link_info
*) inf
;
2223 htab
= elf_i386_hash_table (info
);
2227 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2229 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2230 here if it is defined and referenced in a non-shared object. */
2231 if (h
->type
== STT_GNU_IFUNC
2233 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
, &eh
->dyn_relocs
,
2235 else if (htab
->elf
.dynamic_sections_created
2236 && h
->plt
.refcount
> 0)
2238 /* Make sure this symbol is output as a dynamic symbol.
2239 Undefined weak syms won't yet be marked as dynamic. */
2240 if (h
->dynindx
== -1
2241 && !h
->forced_local
)
2243 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2248 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2250 asection
*s
= htab
->elf
.splt
;
2252 /* If this is the first .plt entry, make room for the special
2255 s
->size
+= plt_entry_size
;
2257 h
->plt
.offset
= s
->size
;
2259 /* If this symbol is not defined in a regular file, and we are
2260 not generating a shared library, then set the symbol to this
2261 location in the .plt. This is required to make function
2262 pointers compare as equal between the normal executable and
2263 the shared library. */
2267 h
->root
.u
.def
.section
= s
;
2268 h
->root
.u
.def
.value
= h
->plt
.offset
;
2271 /* Make room for this entry. */
2272 s
->size
+= plt_entry_size
;
2274 /* We also need to make an entry in the .got.plt section, which
2275 will be placed in the .got section by the linker script. */
2276 htab
->elf
.sgotplt
->size
+= 4;
2278 /* We also need to make an entry in the .rel.plt section. */
2279 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2280 htab
->elf
.srelplt
->reloc_count
++;
2282 if (get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
2285 /* VxWorks has a second set of relocations for each PLT entry
2286 in executables. They go in a separate relocation section,
2287 which is processed by the kernel loader. */
2289 /* There are two relocations for the initial PLT entry: an
2290 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2291 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2293 if (h
->plt
.offset
== plt_entry_size
)
2294 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2296 /* There are two extra relocations for each subsequent PLT entry:
2297 an R_386_32 relocation for the GOT entry, and an R_386_32
2298 relocation for the PLT entry. */
2300 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2305 h
->plt
.offset
= (bfd_vma
) -1;
2311 h
->plt
.offset
= (bfd_vma
) -1;
2315 eh
->tlsdesc_got
= (bfd_vma
) -1;
2317 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2318 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2319 if (h
->got
.refcount
> 0
2322 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
2323 h
->got
.offset
= (bfd_vma
) -1;
2324 else if (h
->got
.refcount
> 0)
2328 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2330 /* Make sure this symbol is output as a dynamic symbol.
2331 Undefined weak syms won't yet be marked as dynamic. */
2332 if (h
->dynindx
== -1
2333 && !h
->forced_local
)
2335 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2340 if (GOT_TLS_GDESC_P (tls_type
))
2342 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2343 - elf_i386_compute_jump_table_size (htab
);
2344 htab
->elf
.sgotplt
->size
+= 8;
2345 h
->got
.offset
= (bfd_vma
) -2;
2347 if (! GOT_TLS_GDESC_P (tls_type
)
2348 || GOT_TLS_GD_P (tls_type
))
2350 h
->got
.offset
= s
->size
;
2352 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2353 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
2356 dyn
= htab
->elf
.dynamic_sections_created
;
2357 /* R_386_TLS_IE_32 needs one dynamic relocation,
2358 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2359 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2360 need two), R_386_TLS_GD needs one if local symbol and two if
2362 if (tls_type
== GOT_TLS_IE_BOTH
)
2363 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2364 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2365 || (tls_type
& GOT_TLS_IE
))
2366 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2367 else if (GOT_TLS_GD_P (tls_type
))
2368 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2369 else if (! GOT_TLS_GDESC_P (tls_type
)
2370 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2371 || h
->root
.type
!= bfd_link_hash_undefweak
)
2373 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2374 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2375 if (GOT_TLS_GDESC_P (tls_type
))
2376 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2379 h
->got
.offset
= (bfd_vma
) -1;
2381 if (eh
->dyn_relocs
== NULL
)
2384 /* In the shared -Bsymbolic case, discard space allocated for
2385 dynamic pc-relative relocs against symbols which turn out to be
2386 defined in regular objects. For the normal shared case, discard
2387 space for pc-relative relocs that have become local due to symbol
2388 visibility changes. */
2392 /* The only reloc that uses pc_count is R_386_PC32, which will
2393 appear on a call or on something like ".long foo - .". We
2394 want calls to protected symbols to resolve directly to the
2395 function rather than going via the plt. If people want
2396 function pointer comparisons to work as expected then they
2397 should avoid writing assembly like ".long foo - .". */
2398 if (SYMBOL_CALLS_LOCAL (info
, h
))
2400 struct elf_dyn_relocs
**pp
;
2402 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2404 p
->count
-= p
->pc_count
;
2413 if (get_elf_i386_backend_data (info
->output_bfd
)->is_vxworks
)
2415 struct elf_dyn_relocs
**pp
;
2416 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2418 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
2425 /* Also discard relocs on undefined weak syms with non-default
2427 if (eh
->dyn_relocs
!= NULL
2428 && h
->root
.type
== bfd_link_hash_undefweak
)
2430 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2431 eh
->dyn_relocs
= NULL
;
2433 /* Make sure undefined weak symbols are output as a dynamic
2435 else if (h
->dynindx
== -1
2436 && !h
->forced_local
)
2438 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2443 else if (ELIMINATE_COPY_RELOCS
)
2445 /* For the non-shared case, discard space for relocs against
2446 symbols which turn out to need copy relocs or are not
2452 || (htab
->elf
.dynamic_sections_created
2453 && (h
->root
.type
== bfd_link_hash_undefweak
2454 || h
->root
.type
== bfd_link_hash_undefined
))))
2456 /* Make sure this symbol is output as a dynamic symbol.
2457 Undefined weak syms won't yet be marked as dynamic. */
2458 if (h
->dynindx
== -1
2459 && !h
->forced_local
)
2461 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2465 /* If that succeeded, we know we'll be keeping all the
2467 if (h
->dynindx
!= -1)
2471 eh
->dyn_relocs
= NULL
;
2476 /* Finally, allocate space. */
2477 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2481 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2483 BFD_ASSERT (sreloc
!= NULL
);
2484 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2490 /* Allocate space in .plt, .got and associated reloc sections for
2491 local dynamic relocs. */
2494 elf_i386_allocate_local_dynrelocs (void **slot
, void *inf
)
2496 struct elf_link_hash_entry
*h
2497 = (struct elf_link_hash_entry
*) *slot
;
2499 if (h
->type
!= STT_GNU_IFUNC
2503 || h
->root
.type
!= bfd_link_hash_defined
)
2506 return elf_i386_allocate_dynrelocs (h
, inf
);
2509 /* Find any dynamic relocs that apply to read-only sections. */
2512 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2514 struct elf_i386_link_hash_entry
*eh
;
2515 struct elf_dyn_relocs
*p
;
2517 /* Skip local IFUNC symbols. */
2518 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2521 eh
= (struct elf_i386_link_hash_entry
*) h
;
2522 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2524 asection
*s
= p
->sec
->output_section
;
2526 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2528 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2530 info
->flags
|= DF_TEXTREL
;
2532 if (info
->warn_shared_textrel
&& info
->shared
)
2533 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2534 p
->sec
->owner
, h
->root
.root
.string
,
2537 /* Not an error, just cut short the traversal. */
2544 /* Set the sizes of the dynamic sections. */
2547 elf_i386_size_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
2549 struct elf_i386_link_hash_table
*htab
;
2555 htab
= elf_i386_hash_table (info
);
2558 dynobj
= htab
->elf
.dynobj
;
2562 if (htab
->elf
.dynamic_sections_created
)
2564 /* Set the contents of the .interp section to the interpreter. */
2565 if (info
->executable
)
2567 s
= bfd_get_section_by_name (dynobj
, ".interp");
2570 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2571 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2575 /* Set up .got offsets for local syms, and space for local dynamic
2577 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2579 bfd_signed_vma
*local_got
;
2580 bfd_signed_vma
*end_local_got
;
2581 char *local_tls_type
;
2582 bfd_vma
*local_tlsdesc_gotent
;
2583 bfd_size_type locsymcount
;
2584 Elf_Internal_Shdr
*symtab_hdr
;
2587 if (! is_i386_elf (ibfd
))
2590 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2592 struct elf_dyn_relocs
*p
;
2594 for (p
= ((struct elf_dyn_relocs
*)
2595 elf_section_data (s
)->local_dynrel
);
2599 if (!bfd_is_abs_section (p
->sec
)
2600 && bfd_is_abs_section (p
->sec
->output_section
))
2602 /* Input section has been discarded, either because
2603 it is a copy of a linkonce section or due to
2604 linker script /DISCARD/, so we'll be discarding
2607 else if (get_elf_i386_backend_data (output_bfd
)->is_vxworks
2608 && strcmp (p
->sec
->output_section
->name
,
2611 /* Relocations in vxworks .tls_vars sections are
2612 handled specially by the loader. */
2614 else if (p
->count
!= 0)
2616 srel
= elf_section_data (p
->sec
)->sreloc
;
2617 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2618 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
2619 && (info
->flags
& DF_TEXTREL
) == 0)
2621 info
->flags
|= DF_TEXTREL
;
2622 if (info
->warn_shared_textrel
&& info
->shared
)
2623 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2624 p
->sec
->owner
, p
->sec
);
2630 local_got
= elf_local_got_refcounts (ibfd
);
2634 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2635 locsymcount
= symtab_hdr
->sh_info
;
2636 end_local_got
= local_got
+ locsymcount
;
2637 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
2638 local_tlsdesc_gotent
= elf_i386_local_tlsdesc_gotent (ibfd
);
2640 srel
= htab
->elf
.srelgot
;
2641 for (; local_got
< end_local_got
;
2642 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2644 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2647 if (GOT_TLS_GDESC_P (*local_tls_type
))
2649 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2650 - elf_i386_compute_jump_table_size (htab
);
2651 htab
->elf
.sgotplt
->size
+= 8;
2652 *local_got
= (bfd_vma
) -2;
2654 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2655 || GOT_TLS_GD_P (*local_tls_type
))
2657 *local_got
= s
->size
;
2659 if (GOT_TLS_GD_P (*local_tls_type
)
2660 || *local_tls_type
== GOT_TLS_IE_BOTH
)
2664 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2665 || (*local_tls_type
& GOT_TLS_IE
))
2667 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
2668 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
2669 else if (GOT_TLS_GD_P (*local_tls_type
)
2670 || ! GOT_TLS_GDESC_P (*local_tls_type
))
2671 srel
->size
+= sizeof (Elf32_External_Rel
);
2672 if (GOT_TLS_GDESC_P (*local_tls_type
))
2673 htab
->elf
.srelplt
->size
+= sizeof (Elf32_External_Rel
);
2677 *local_got
= (bfd_vma
) -1;
2681 if (htab
->tls_ldm_got
.refcount
> 0)
2683 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2685 htab
->tls_ldm_got
.offset
= htab
->elf
.sgot
->size
;
2686 htab
->elf
.sgot
->size
+= 8;
2687 htab
->elf
.srelgot
->size
+= sizeof (Elf32_External_Rel
);
2690 htab
->tls_ldm_got
.offset
= -1;
2692 /* Allocate global sym .plt and .got entries, and space for global
2693 sym dynamic relocs. */
2694 elf_link_hash_traverse (&htab
->elf
, elf_i386_allocate_dynrelocs
, info
);
2696 /* Allocate .plt and .got entries, and space for local symbols. */
2697 htab_traverse (htab
->loc_hash_table
,
2698 elf_i386_allocate_local_dynrelocs
,
2701 /* For every jump slot reserved in the sgotplt, reloc_count is
2702 incremented. However, when we reserve space for TLS descriptors,
2703 it's not incremented, so in order to compute the space reserved
2704 for them, it suffices to multiply the reloc count by the jump
2707 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2708 so that R_386_IRELATIVE entries come last. */
2709 if (htab
->elf
.srelplt
)
2711 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
2712 htab
->sgotplt_jump_table_size
= htab
->next_tls_desc_index
* 4;
2713 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
2715 else if (htab
->elf
.irelplt
)
2716 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
2719 if (htab
->elf
.sgotplt
)
2721 struct elf_link_hash_entry
*got
;
2722 got
= elf_link_hash_lookup (elf_hash_table (info
),
2723 "_GLOBAL_OFFSET_TABLE_",
2724 FALSE
, FALSE
, FALSE
);
2726 /* Don't allocate .got.plt section if there are no GOT nor PLT
2727 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2729 || !got
->ref_regular_nonweak
)
2730 && (htab
->elf
.sgotplt
->size
2731 == get_elf_backend_data (output_bfd
)->got_header_size
)
2732 && (htab
->elf
.splt
== NULL
2733 || htab
->elf
.splt
->size
== 0)
2734 && (htab
->elf
.sgot
== NULL
2735 || htab
->elf
.sgot
->size
== 0)
2736 && (htab
->elf
.iplt
== NULL
2737 || htab
->elf
.iplt
->size
== 0)
2738 && (htab
->elf
.igotplt
== NULL
2739 || htab
->elf
.igotplt
->size
== 0))
2740 htab
->elf
.sgotplt
->size
= 0;
2743 /* We now have determined the sizes of the various dynamic sections.
2744 Allocate memory for them. */
2746 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2748 bfd_boolean strip_section
= TRUE
;
2750 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2753 if (s
== htab
->elf
.splt
2754 || s
== htab
->elf
.sgot
2755 || s
== htab
->elf
.sgotplt
2756 || s
== htab
->elf
.iplt
2757 || s
== htab
->elf
.igotplt
2758 || s
== htab
->sdynbss
)
2760 /* Strip this section if we don't need it; see the
2762 /* We'd like to strip these sections if they aren't needed, but if
2763 we've exported dynamic symbols from them we must leave them.
2764 It's too late to tell BFD to get rid of the symbols. */
2766 if (htab
->elf
.hplt
!= NULL
)
2767 strip_section
= FALSE
;
2769 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rel"))
2772 && s
!= htab
->elf
.srelplt
2773 && s
!= htab
->srelplt2
)
2776 /* We use the reloc_count field as a counter if we need
2777 to copy relocs into the output file. */
2782 /* It's not one of our sections, so don't allocate space. */
2788 /* If we don't need this section, strip it from the
2789 output file. This is mostly to handle .rel.bss and
2790 .rel.plt. We must create both sections in
2791 create_dynamic_sections, because they must be created
2792 before the linker maps input sections to output
2793 sections. The linker does that before
2794 adjust_dynamic_symbol is called, and it is that
2795 function which decides whether anything needs to go
2796 into these sections. */
2798 s
->flags
|= SEC_EXCLUDE
;
2802 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2805 /* Allocate memory for the section contents. We use bfd_zalloc
2806 here in case unused entries are not reclaimed before the
2807 section's contents are written out. This should not happen,
2808 but this way if it does, we get a R_386_NONE reloc instead
2810 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
2811 if (s
->contents
== NULL
)
2815 if (htab
->plt_eh_frame
!= NULL
2816 && htab
->elf
.splt
!= NULL
2817 && htab
->elf
.splt
->size
!= 0
2818 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0)
2819 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
2820 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
2822 if (htab
->elf
.dynamic_sections_created
)
2824 /* Add some entries to the .dynamic section. We fill in the
2825 values later, in elf_i386_finish_dynamic_sections, but we
2826 must add the entries now so that we get the correct size for
2827 the .dynamic section. The DT_DEBUG entry is filled in by the
2828 dynamic linker and used by the debugger. */
2829 #define add_dynamic_entry(TAG, VAL) \
2830 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2832 if (info
->executable
)
2834 if (!add_dynamic_entry (DT_DEBUG
, 0))
2838 if (htab
->elf
.splt
->size
!= 0)
2840 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2841 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2842 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
2843 || !add_dynamic_entry (DT_JMPREL
, 0))
2849 if (!add_dynamic_entry (DT_REL
, 0)
2850 || !add_dynamic_entry (DT_RELSZ
, 0)
2851 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
2854 /* If any dynamic relocs apply to a read-only section,
2855 then we need a DT_TEXTREL entry. */
2856 if ((info
->flags
& DF_TEXTREL
) == 0)
2857 elf_link_hash_traverse (&htab
->elf
,
2858 elf_i386_readonly_dynrelocs
, info
);
2860 if ((info
->flags
& DF_TEXTREL
) != 0)
2862 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2866 if (get_elf_i386_backend_data (output_bfd
)->is_vxworks
2867 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
2870 #undef add_dynamic_entry
2876 elf_i386_always_size_sections (bfd
*output_bfd
,
2877 struct bfd_link_info
*info
)
2879 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2883 struct elf_link_hash_entry
*tlsbase
;
2885 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2886 "_TLS_MODULE_BASE_",
2887 FALSE
, FALSE
, FALSE
);
2889 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2891 struct elf_i386_link_hash_table
*htab
;
2892 struct bfd_link_hash_entry
*bh
= NULL
;
2893 const struct elf_backend_data
*bed
2894 = get_elf_backend_data (output_bfd
);
2896 htab
= elf_i386_hash_table (info
);
2900 if (!(_bfd_generic_link_add_one_symbol
2901 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2902 tls_sec
, 0, NULL
, FALSE
,
2903 bed
->collect
, &bh
)))
2906 htab
->tls_module_base
= bh
;
2908 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2909 tlsbase
->def_regular
= 1;
2910 tlsbase
->other
= STV_HIDDEN
;
2911 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2918 /* Set the correct type for an x86 ELF section. We do this by the
2919 section name, which is a hack, but ought to work. */
2922 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
2923 Elf_Internal_Shdr
*hdr
,
2928 name
= bfd_get_section_name (abfd
, sec
);
2930 /* This is an ugly, but unfortunately necessary hack that is
2931 needed when producing EFI binaries on x86. It tells
2932 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2933 containing ELF relocation info. We need this hack in order to
2934 be able to generate ELF binaries that can be translated into
2935 EFI applications (which are essentially COFF objects). Those
2936 files contain a COFF ".reloc" section inside an ELFNN object,
2937 which would normally cause BFD to segfault because it would
2938 attempt to interpret this section as containing relocation
2939 entries for section "oc". With this hack enabled, ".reloc"
2940 will be treated as a normal data section, which will avoid the
2941 segfault. However, you won't be able to create an ELFNN binary
2942 with a section named "oc" that needs relocations, but that's
2943 the kind of ugly side-effects you get when detecting section
2944 types based on their names... In practice, this limitation is
2945 unlikely to bite. */
2946 if (strcmp (name
, ".reloc") == 0)
2947 hdr
->sh_type
= SHT_PROGBITS
;
2952 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2953 executables. Rather than setting it to the beginning of the TLS
2954 section, we have to set it to the end. This function may be called
2955 multiple times, it is idempotent. */
2958 elf_i386_set_tls_module_base (struct bfd_link_info
*info
)
2960 struct elf_i386_link_hash_table
*htab
;
2961 struct bfd_link_hash_entry
*base
;
2963 if (!info
->executable
)
2966 htab
= elf_i386_hash_table (info
);
2970 base
= htab
->tls_module_base
;
2974 base
->u
.def
.value
= htab
->elf
.tls_size
;
2977 /* Return the base VMA address which should be subtracted from real addresses
2978 when resolving @dtpoff relocation.
2979 This is PT_TLS segment p_vaddr. */
2982 elf_i386_dtpoff_base (struct bfd_link_info
*info
)
2984 /* If tls_sec is NULL, we should have signalled an error already. */
2985 if (elf_hash_table (info
)->tls_sec
== NULL
)
2987 return elf_hash_table (info
)->tls_sec
->vma
;
2990 /* Return the relocation value for @tpoff relocation
2991 if STT_TLS virtual address is ADDRESS. */
2994 elf_i386_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2996 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2997 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2998 bfd_vma static_tls_size
;
3000 /* If tls_sec is NULL, we should have signalled an error already. */
3001 if (htab
->tls_sec
== NULL
)
3004 /* Consider special static TLS alignment requirements. */
3005 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3006 return static_tls_size
+ htab
->tls_sec
->vma
- address
;
3009 /* Relocate an i386 ELF section. */
3012 elf_i386_relocate_section (bfd
*output_bfd
,
3013 struct bfd_link_info
*info
,
3015 asection
*input_section
,
3017 Elf_Internal_Rela
*relocs
,
3018 Elf_Internal_Sym
*local_syms
,
3019 asection
**local_sections
)
3021 struct elf_i386_link_hash_table
*htab
;
3022 Elf_Internal_Shdr
*symtab_hdr
;
3023 struct elf_link_hash_entry
**sym_hashes
;
3024 bfd_vma
*local_got_offsets
;
3025 bfd_vma
*local_tlsdesc_gotents
;
3026 Elf_Internal_Rela
*rel
;
3027 Elf_Internal_Rela
*relend
;
3028 bfd_boolean is_vxworks_tls
;
3029 unsigned plt_entry_size
;
3031 BFD_ASSERT (is_i386_elf (input_bfd
));
3033 htab
= elf_i386_hash_table (info
);
3036 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3037 sym_hashes
= elf_sym_hashes (input_bfd
);
3038 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3039 local_tlsdesc_gotents
= elf_i386_local_tlsdesc_gotent (input_bfd
);
3040 /* We have to handle relocations in vxworks .tls_vars sections
3041 specially, because the dynamic loader is 'weird'. */
3042 is_vxworks_tls
= (get_elf_i386_backend_data (output_bfd
)->is_vxworks
3044 && !strcmp (input_section
->output_section
->name
,
3047 elf_i386_set_tls_module_base (info
);
3049 plt_entry_size
= GET_PLT_ENTRY_SIZE (output_bfd
);
3052 relend
= relocs
+ input_section
->reloc_count
;
3053 for (; rel
< relend
; rel
++)
3055 unsigned int r_type
;
3056 reloc_howto_type
*howto
;
3057 unsigned long r_symndx
;
3058 struct elf_link_hash_entry
*h
;
3059 Elf_Internal_Sym
*sym
;
3061 bfd_vma off
, offplt
;
3063 bfd_boolean unresolved_reloc
;
3064 bfd_reloc_status_type r
;
3068 r_type
= ELF32_R_TYPE (rel
->r_info
);
3069 if (r_type
== R_386_GNU_VTINHERIT
3070 || r_type
== R_386_GNU_VTENTRY
)
3073 if ((indx
= r_type
) >= R_386_standard
3074 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
3075 >= R_386_ext
- R_386_standard
)
3076 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
3077 >= R_386_irelative
- R_386_ext
))
3079 (*_bfd_error_handler
)
3080 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3081 input_bfd
, input_section
, r_type
);
3082 bfd_set_error (bfd_error_bad_value
);
3085 howto
= elf_howto_table
+ indx
;
3087 r_symndx
= ELF32_R_SYM (rel
->r_info
);
3091 unresolved_reloc
= FALSE
;
3092 if (r_symndx
< symtab_hdr
->sh_info
)
3094 sym
= local_syms
+ r_symndx
;
3095 sec
= local_sections
[r_symndx
];
3096 relocation
= (sec
->output_section
->vma
3097 + sec
->output_offset
3100 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
3101 && ((sec
->flags
& SEC_MERGE
) != 0
3102 || (info
->relocatable
3103 && sec
->output_offset
!= 0)))
3106 bfd_byte
*where
= contents
+ rel
->r_offset
;
3108 switch (howto
->size
)
3111 addend
= bfd_get_8 (input_bfd
, where
);
3112 if (howto
->pc_relative
)
3114 addend
= (addend
^ 0x80) - 0x80;
3119 addend
= bfd_get_16 (input_bfd
, where
);
3120 if (howto
->pc_relative
)
3122 addend
= (addend
^ 0x8000) - 0x8000;
3127 addend
= bfd_get_32 (input_bfd
, where
);
3128 if (howto
->pc_relative
)
3130 addend
= (addend
^ 0x80000000) - 0x80000000;
3138 if (info
->relocatable
)
3139 addend
+= sec
->output_offset
;
3142 asection
*msec
= sec
;
3143 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
3145 addend
-= relocation
;
3146 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
3149 switch (howto
->size
)
3152 /* FIXME: overflow checks. */
3153 if (howto
->pc_relative
)
3155 bfd_put_8 (input_bfd
, addend
, where
);
3158 if (howto
->pc_relative
)
3160 bfd_put_16 (input_bfd
, addend
, where
);
3163 if (howto
->pc_relative
)
3165 bfd_put_32 (input_bfd
, addend
, where
);
3169 else if (!info
->relocatable
3170 && ELF32_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3172 /* Relocate against local STT_GNU_IFUNC symbol. */
3173 h
= elf_i386_get_local_sym_hash (htab
, input_bfd
, rel
,
3178 /* Set STT_GNU_IFUNC symbol value. */
3179 h
->root
.u
.def
.value
= sym
->st_value
;
3180 h
->root
.u
.def
.section
= sec
;
3185 bfd_boolean warned ATTRIBUTE_UNUSED
;
3187 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3188 r_symndx
, symtab_hdr
, sym_hashes
,
3190 unresolved_reloc
, warned
);
3193 if (sec
!= NULL
&& discarded_section (sec
))
3194 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3195 rel
, 1, relend
, howto
, 0, contents
);
3197 if (info
->relocatable
)
3200 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3201 it here if it is defined in a non-shared object. */
3203 && h
->type
== STT_GNU_IFUNC
3206 asection
*plt
, *gotplt
, *base_got
;
3210 if ((input_section
->flags
& SEC_ALLOC
) == 0
3211 || h
->plt
.offset
== (bfd_vma
) -1)
3214 /* STT_GNU_IFUNC symbol must go through PLT. */
3215 if (htab
->elf
.splt
!= NULL
)
3217 plt
= htab
->elf
.splt
;
3218 gotplt
= htab
->elf
.sgotplt
;
3222 plt
= htab
->elf
.iplt
;
3223 gotplt
= htab
->elf
.igotplt
;
3226 relocation
= (plt
->output_section
->vma
3227 + plt
->output_offset
+ h
->plt
.offset
);
3232 if (h
->root
.root
.string
)
3233 name
= h
->root
.root
.string
;
3235 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3237 (*_bfd_error_handler
)
3238 (_("%B: relocation %s against STT_GNU_IFUNC "
3239 "symbol `%s' isn't handled by %s"), input_bfd
,
3240 elf_howto_table
[r_type
].name
,
3241 name
, __FUNCTION__
);
3242 bfd_set_error (bfd_error_bad_value
);
3246 /* Generate dynamic relcoation only when there is a
3247 non-GOT reference in a shared object. */
3248 if (info
->shared
&& h
->non_got_ref
)
3250 Elf_Internal_Rela outrel
;
3255 /* Need a dynamic relocation to get the real function
3257 offset
= _bfd_elf_section_offset (output_bfd
,
3261 if (offset
== (bfd_vma
) -1
3262 || offset
== (bfd_vma
) -2)
3265 outrel
.r_offset
= (input_section
->output_section
->vma
3266 + input_section
->output_offset
3269 if (h
->dynindx
== -1
3271 || info
->executable
)
3273 /* This symbol is resolved locally. */
3274 outrel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
3275 bfd_put_32 (output_bfd
,
3276 (h
->root
.u
.def
.value
3277 + h
->root
.u
.def
.section
->output_section
->vma
3278 + h
->root
.u
.def
.section
->output_offset
),
3282 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
3284 sreloc
= htab
->elf
.irelifunc
;
3285 loc
= sreloc
->contents
;
3286 loc
+= (sreloc
->reloc_count
++
3287 * sizeof (Elf32_External_Rel
));
3288 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3290 /* If this reloc is against an external symbol, we
3291 do not want to fiddle with the addend. Otherwise,
3292 we need to include the symbol value so that it
3293 becomes an addend for the dynamic reloc. For an
3294 internal symbol, we have updated addend. */
3303 base_got
= htab
->elf
.sgot
;
3304 off
= h
->got
.offset
;
3306 if (base_got
== NULL
)
3309 if (off
== (bfd_vma
) -1)
3311 /* We can't use h->got.offset here to save state, or
3312 even just remember the offset, as finish_dynamic_symbol
3313 would use that as offset into .got. */
3315 if (htab
->elf
.splt
!= NULL
)
3317 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3318 off
= (plt_index
+ 3) * 4;
3319 base_got
= htab
->elf
.sgotplt
;
3323 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3324 off
= plt_index
* 4;
3325 base_got
= htab
->elf
.igotplt
;
3328 if (h
->dynindx
== -1
3332 /* This references the local defitionion. We must
3333 initialize this entry in the global offset table.
3334 Since the offset must always be a multiple of 8,
3335 we use the least significant bit to record
3336 whether we have initialized it already.
3338 When doing a dynamic link, we create a .rela.got
3339 relocation entry to initialize the value. This
3340 is done in the finish_dynamic_symbol routine. */
3345 bfd_put_32 (output_bfd
, relocation
,
3346 base_got
->contents
+ off
);
3353 /* Adjust for static executables. */
3354 if (htab
->elf
.splt
== NULL
)
3355 relocation
+= gotplt
->output_offset
;
3359 relocation
= (base_got
->output_section
->vma
3360 + base_got
->output_offset
+ off
3361 - gotplt
->output_section
->vma
3362 - gotplt
->output_offset
);
3363 /* Adjust for static executables. */
3364 if (htab
->elf
.splt
== NULL
)
3365 relocation
+= gotplt
->output_offset
;
3371 relocation
-= (gotplt
->output_section
->vma
3372 + gotplt
->output_offset
);
3380 /* Relocation is to the entry for this symbol in the global
3382 if (htab
->elf
.sgot
== NULL
)
3389 off
= h
->got
.offset
;
3390 dyn
= htab
->elf
.dynamic_sections_created
;
3391 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3393 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3394 || (ELF_ST_VISIBILITY (h
->other
)
3395 && h
->root
.type
== bfd_link_hash_undefweak
))
3397 /* This is actually a static link, or it is a
3398 -Bsymbolic link and the symbol is defined
3399 locally, or the symbol was forced to be local
3400 because of a version file. We must initialize
3401 this entry in the global offset table. Since the
3402 offset must always be a multiple of 4, we use the
3403 least significant bit to record whether we have
3404 initialized it already.
3406 When doing a dynamic link, we create a .rel.got
3407 relocation entry to initialize the value. This
3408 is done in the finish_dynamic_symbol routine. */
3413 bfd_put_32 (output_bfd
, relocation
,
3414 htab
->elf
.sgot
->contents
+ off
);
3419 unresolved_reloc
= FALSE
;
3423 if (local_got_offsets
== NULL
)
3426 off
= local_got_offsets
[r_symndx
];
3428 /* The offset must always be a multiple of 4. We use
3429 the least significant bit to record whether we have
3430 already generated the necessary reloc. */
3435 bfd_put_32 (output_bfd
, relocation
,
3436 htab
->elf
.sgot
->contents
+ off
);
3441 Elf_Internal_Rela outrel
;
3444 s
= htab
->elf
.srelgot
;
3448 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3449 + htab
->elf
.sgot
->output_offset
3451 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3453 loc
+= s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3454 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3457 local_got_offsets
[r_symndx
] |= 1;
3461 if (off
>= (bfd_vma
) -2)
3464 relocation
= htab
->elf
.sgot
->output_section
->vma
3465 + htab
->elf
.sgot
->output_offset
+ off
3466 - htab
->elf
.sgotplt
->output_section
->vma
3467 - htab
->elf
.sgotplt
->output_offset
;
3471 /* Relocation is relative to the start of the global offset
3474 /* Check to make sure it isn't a protected function symbol
3475 for shared library since it may not be local when used
3476 as function address. We also need to make sure that a
3477 symbol is defined locally. */
3478 if (info
->shared
&& h
)
3480 if (!h
->def_regular
)
3484 switch (ELF_ST_VISIBILITY (h
->other
))
3487 v
= _("hidden symbol");
3490 v
= _("internal symbol");
3493 v
= _("protected symbol");
3500 (*_bfd_error_handler
)
3501 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3502 input_bfd
, v
, h
->root
.root
.string
);
3503 bfd_set_error (bfd_error_bad_value
);
3506 else if (!info
->executable
3507 && !SYMBOLIC_BIND (info
, h
)
3508 && h
->type
== STT_FUNC
3509 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3511 (*_bfd_error_handler
)
3512 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3513 input_bfd
, h
->root
.root
.string
);
3514 bfd_set_error (bfd_error_bad_value
);
3519 /* Note that sgot is not involved in this
3520 calculation. We always want the start of .got.plt. If we
3521 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3522 permitted by the ABI, we might have to change this
3524 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3525 + htab
->elf
.sgotplt
->output_offset
;
3529 /* Use global offset table as symbol value. */
3530 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3531 + htab
->elf
.sgotplt
->output_offset
;
3532 unresolved_reloc
= FALSE
;
3536 /* Relocation is to the entry for this symbol in the
3537 procedure linkage table. */
3539 /* Resolve a PLT32 reloc against a local symbol directly,
3540 without using the procedure linkage table. */
3544 if (h
->plt
.offset
== (bfd_vma
) -1
3545 || htab
->elf
.splt
== NULL
)
3547 /* We didn't make a PLT entry for this symbol. This
3548 happens when statically linking PIC code, or when
3549 using -Bsymbolic. */
3553 relocation
= (htab
->elf
.splt
->output_section
->vma
3554 + htab
->elf
.splt
->output_offset
3556 unresolved_reloc
= FALSE
;
3561 if ((input_section
->flags
& SEC_ALLOC
) == 0
3567 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3568 || h
->root
.type
!= bfd_link_hash_undefweak
)
3569 && (r_type
!= R_386_PC32
3570 || !SYMBOL_CALLS_LOCAL (info
, h
)))
3571 || (ELIMINATE_COPY_RELOCS
3578 || h
->root
.type
== bfd_link_hash_undefweak
3579 || h
->root
.type
== bfd_link_hash_undefined
)))
3581 Elf_Internal_Rela outrel
;
3583 bfd_boolean skip
, relocate
;
3586 /* When generating a shared object, these relocations
3587 are copied into the output file to be resolved at run
3594 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3596 if (outrel
.r_offset
== (bfd_vma
) -1)
3598 else if (outrel
.r_offset
== (bfd_vma
) -2)
3599 skip
= TRUE
, relocate
= TRUE
;
3600 outrel
.r_offset
+= (input_section
->output_section
->vma
3601 + input_section
->output_offset
);
3604 memset (&outrel
, 0, sizeof outrel
);
3607 && (r_type
== R_386_PC32
3609 || !SYMBOLIC_BIND (info
, h
)
3610 || !h
->def_regular
))
3611 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
3614 /* This symbol is local, or marked to become local. */
3616 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3619 sreloc
= elf_section_data (input_section
)->sreloc
;
3621 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3623 r
= bfd_reloc_notsupported
;
3624 goto check_relocation_error
;
3627 loc
= sreloc
->contents
;
3628 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3630 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3632 /* If this reloc is against an external symbol, we do
3633 not want to fiddle with the addend. Otherwise, we
3634 need to include the symbol value so that it becomes
3635 an addend for the dynamic reloc. */
3642 if (!info
->executable
)
3644 Elf_Internal_Rela outrel
;
3648 outrel
.r_offset
= rel
->r_offset
3649 + input_section
->output_section
->vma
3650 + input_section
->output_offset
;
3651 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3652 sreloc
= elf_section_data (input_section
)->sreloc
;
3655 loc
= sreloc
->contents
;
3656 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3657 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3662 case R_386_TLS_GOTDESC
:
3663 case R_386_TLS_DESC_CALL
:
3664 case R_386_TLS_IE_32
:
3665 case R_386_TLS_GOTIE
:
3666 tls_type
= GOT_UNKNOWN
;
3667 if (h
== NULL
&& local_got_offsets
)
3668 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
3670 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
3671 if (tls_type
== GOT_TLS_IE
)
3672 tls_type
= GOT_TLS_IE_NEG
;
3674 if (! elf_i386_tls_transition (info
, input_bfd
,
3675 input_section
, contents
,
3676 symtab_hdr
, sym_hashes
,
3677 &r_type
, tls_type
, rel
,
3678 relend
, h
, r_symndx
))
3681 if (r_type
== R_386_TLS_LE_32
)
3683 BFD_ASSERT (! unresolved_reloc
);
3684 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
3689 /* GD->LE transition. */
3690 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3693 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3695 movl %gs:0, %eax; subl $foo@tpoff, %eax
3696 (6 byte form of subl). */
3697 memcpy (contents
+ rel
->r_offset
- 3,
3698 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3699 roff
= rel
->r_offset
+ 5;
3703 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3705 movl %gs:0, %eax; subl $foo@tpoff, %eax
3706 (6 byte form of subl). */
3707 memcpy (contents
+ rel
->r_offset
- 2,
3708 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3709 roff
= rel
->r_offset
+ 6;
3711 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
3713 /* Skip R_386_PC32/R_386_PLT32. */
3717 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
3719 /* GDesc -> LE transition.
3720 It's originally something like:
3721 leal x@tlsdesc(%ebx), %eax
3725 Registers other than %eax may be set up here. */
3730 roff
= rel
->r_offset
;
3731 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3733 /* Now modify the instruction as appropriate. */
3734 /* aoliva FIXME: remove the above and xor the byte
3736 bfd_put_8 (output_bfd
, val
^ 0x86,
3737 contents
+ roff
- 1);
3738 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3742 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
3744 /* GDesc -> LE transition.
3752 roff
= rel
->r_offset
;
3753 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3754 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3757 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
3761 /* IE->LE transition:
3762 Originally it can be one of:
3770 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3773 /* movl foo, %eax. */
3774 bfd_put_8 (output_bfd
, 0xb8,
3775 contents
+ rel
->r_offset
- 1);
3781 type
= bfd_get_8 (input_bfd
,
3782 contents
+ rel
->r_offset
- 2);
3787 bfd_put_8 (output_bfd
, 0xc7,
3788 contents
+ rel
->r_offset
- 2);
3789 bfd_put_8 (output_bfd
,
3790 0xc0 | ((val
>> 3) & 7),
3791 contents
+ rel
->r_offset
- 1);
3795 bfd_put_8 (output_bfd
, 0x81,
3796 contents
+ rel
->r_offset
- 2);
3797 bfd_put_8 (output_bfd
,
3798 0xc0 | ((val
>> 3) & 7),
3799 contents
+ rel
->r_offset
- 1);
3806 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3807 contents
+ rel
->r_offset
);
3812 unsigned int val
, type
;
3814 /* {IE_32,GOTIE}->LE transition:
3815 Originally it can be one of:
3816 subl foo(%reg1), %reg2
3817 movl foo(%reg1), %reg2
3818 addl foo(%reg1), %reg2
3821 movl $foo, %reg2 (6 byte form)
3822 addl $foo, %reg2. */
3823 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3824 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3828 bfd_put_8 (output_bfd
, 0xc7,
3829 contents
+ rel
->r_offset
- 2);
3830 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3831 contents
+ rel
->r_offset
- 1);
3833 else if (type
== 0x2b)
3836 bfd_put_8 (output_bfd
, 0x81,
3837 contents
+ rel
->r_offset
- 2);
3838 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
3839 contents
+ rel
->r_offset
- 1);
3841 else if (type
== 0x03)
3844 bfd_put_8 (output_bfd
, 0x81,
3845 contents
+ rel
->r_offset
- 2);
3846 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3847 contents
+ rel
->r_offset
- 1);
3851 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
3852 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3853 contents
+ rel
->r_offset
);
3855 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
3856 contents
+ rel
->r_offset
);
3861 if (htab
->elf
.sgot
== NULL
)
3866 off
= h
->got
.offset
;
3867 offplt
= elf_i386_hash_entry (h
)->tlsdesc_got
;
3871 if (local_got_offsets
== NULL
)
3874 off
= local_got_offsets
[r_symndx
];
3875 offplt
= local_tlsdesc_gotents
[r_symndx
];
3882 Elf_Internal_Rela outrel
;
3887 if (htab
->elf
.srelgot
== NULL
)
3890 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3892 if (GOT_TLS_GDESC_P (tls_type
))
3894 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
3895 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
3896 <= htab
->elf
.sgotplt
->size
);
3897 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3898 + htab
->elf
.sgotplt
->output_offset
3900 + htab
->sgotplt_jump_table_size
);
3901 sreloc
= htab
->elf
.srelplt
;
3902 loc
= sreloc
->contents
;
3903 loc
+= (htab
->next_tls_desc_index
++
3904 * sizeof (Elf32_External_Rel
));
3905 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3906 <= sreloc
->contents
+ sreloc
->size
);
3907 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3910 BFD_ASSERT (! unresolved_reloc
);
3911 bfd_put_32 (output_bfd
,
3912 relocation
- elf_i386_dtpoff_base (info
),
3913 htab
->elf
.sgotplt
->contents
+ offplt
3914 + htab
->sgotplt_jump_table_size
+ 4);
3918 bfd_put_32 (output_bfd
, 0,
3919 htab
->elf
.sgotplt
->contents
+ offplt
3920 + htab
->sgotplt_jump_table_size
+ 4);
3924 sreloc
= htab
->elf
.srelgot
;
3926 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3927 + htab
->elf
.sgot
->output_offset
+ off
);
3929 if (GOT_TLS_GD_P (tls_type
))
3930 dr_type
= R_386_TLS_DTPMOD32
;
3931 else if (GOT_TLS_GDESC_P (tls_type
))
3933 else if (tls_type
== GOT_TLS_IE_POS
)
3934 dr_type
= R_386_TLS_TPOFF
;
3936 dr_type
= R_386_TLS_TPOFF32
;
3938 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
3939 bfd_put_32 (output_bfd
,
3940 relocation
- elf_i386_dtpoff_base (info
),
3941 htab
->elf
.sgot
->contents
+ off
);
3942 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
3943 bfd_put_32 (output_bfd
,
3944 elf_i386_dtpoff_base (info
) - relocation
,
3945 htab
->elf
.sgot
->contents
+ off
);
3946 else if (dr_type
!= R_386_TLS_DESC
)
3947 bfd_put_32 (output_bfd
, 0,
3948 htab
->elf
.sgot
->contents
+ off
);
3949 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
3951 loc
= sreloc
->contents
;
3952 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3953 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3954 <= sreloc
->contents
+ sreloc
->size
);
3955 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3957 if (GOT_TLS_GD_P (tls_type
))
3961 BFD_ASSERT (! unresolved_reloc
);
3962 bfd_put_32 (output_bfd
,
3963 relocation
- elf_i386_dtpoff_base (info
),
3964 htab
->elf
.sgot
->contents
+ off
+ 4);
3968 bfd_put_32 (output_bfd
, 0,
3969 htab
->elf
.sgot
->contents
+ off
+ 4);
3970 outrel
.r_info
= ELF32_R_INFO (indx
,
3971 R_386_TLS_DTPOFF32
);
3972 outrel
.r_offset
+= 4;
3973 sreloc
->reloc_count
++;
3974 loc
+= sizeof (Elf32_External_Rel
);
3975 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3976 <= sreloc
->contents
+ sreloc
->size
);
3977 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3980 else if (tls_type
== GOT_TLS_IE_BOTH
)
3982 bfd_put_32 (output_bfd
,
3984 ? relocation
- elf_i386_dtpoff_base (info
)
3986 htab
->elf
.sgot
->contents
+ off
+ 4);
3987 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3988 outrel
.r_offset
+= 4;
3989 sreloc
->reloc_count
++;
3990 loc
+= sizeof (Elf32_External_Rel
);
3991 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3998 local_got_offsets
[r_symndx
] |= 1;
4001 if (off
>= (bfd_vma
) -2
4002 && ! GOT_TLS_GDESC_P (tls_type
))
4004 if (r_type
== R_386_TLS_GOTDESC
4005 || r_type
== R_386_TLS_DESC_CALL
)
4007 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
4008 unresolved_reloc
= FALSE
;
4010 else if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4012 bfd_vma g_o_t
= htab
->elf
.sgotplt
->output_section
->vma
4013 + htab
->elf
.sgotplt
->output_offset
;
4014 relocation
= htab
->elf
.sgot
->output_section
->vma
4015 + htab
->elf
.sgot
->output_offset
+ off
- g_o_t
;
4016 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
4017 && tls_type
== GOT_TLS_IE_BOTH
)
4019 if (r_type
== R_386_TLS_IE
)
4020 relocation
+= g_o_t
;
4021 unresolved_reloc
= FALSE
;
4023 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
4025 unsigned int val
, type
;
4028 /* GD->IE transition. */
4029 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
4030 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
4033 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4035 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4037 roff
= rel
->r_offset
- 3;
4041 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4043 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4044 roff
= rel
->r_offset
- 2;
4046 memcpy (contents
+ roff
,
4047 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4048 contents
[roff
+ 7] = 0x80 | (val
& 7);
4049 /* If foo is used only with foo@gotntpoff(%reg) and
4050 foo@indntpoff, but not with foo@gottpoff(%reg), change
4051 subl $foo@gottpoff(%reg), %eax
4053 addl $foo@gotntpoff(%reg), %eax. */
4054 if (tls_type
== GOT_TLS_IE_POS
)
4055 contents
[roff
+ 6] = 0x03;
4056 bfd_put_32 (output_bfd
,
4057 htab
->elf
.sgot
->output_section
->vma
4058 + htab
->elf
.sgot
->output_offset
+ off
4059 - htab
->elf
.sgotplt
->output_section
->vma
4060 - htab
->elf
.sgotplt
->output_offset
,
4061 contents
+ roff
+ 8);
4062 /* Skip R_386_PLT32. */
4066 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
4068 /* GDesc -> IE transition.
4069 It's originally something like:
4070 leal x@tlsdesc(%ebx), %eax
4073 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4075 movl x@gottpoff(%ebx), %eax # before negl %eax
4077 Registers other than %eax may be set up here. */
4081 /* First, make sure it's a leal adding ebx to a 32-bit
4082 offset into any register, although it's probably
4083 almost always going to be eax. */
4084 roff
= rel
->r_offset
;
4086 /* Now modify the instruction as appropriate. */
4087 /* To turn a leal into a movl in the form we use it, it
4088 suffices to change the first byte from 0x8d to 0x8b.
4089 aoliva FIXME: should we decide to keep the leal, all
4090 we have to do is remove the statement below, and
4091 adjust the relaxation of R_386_TLS_DESC_CALL. */
4092 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4094 if (tls_type
== GOT_TLS_IE_BOTH
)
4097 bfd_put_32 (output_bfd
,
4098 htab
->elf
.sgot
->output_section
->vma
4099 + htab
->elf
.sgot
->output_offset
+ off
4100 - htab
->elf
.sgotplt
->output_section
->vma
4101 - htab
->elf
.sgotplt
->output_offset
,
4105 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
4107 /* GDesc -> IE transition.
4115 depending on how we transformed the TLS_GOTDESC above.
4120 roff
= rel
->r_offset
;
4122 /* Now modify the instruction as appropriate. */
4123 if (tls_type
!= GOT_TLS_IE_NEG
)
4126 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4127 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4132 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
4133 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
4143 if (! elf_i386_tls_transition (info
, input_bfd
,
4144 input_section
, contents
,
4145 symtab_hdr
, sym_hashes
,
4146 &r_type
, GOT_UNKNOWN
, rel
,
4147 relend
, h
, r_symndx
))
4150 if (r_type
!= R_386_TLS_LDM
)
4152 /* LD->LE transition:
4153 leal foo(%reg), %eax; call ___tls_get_addr.
4155 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4156 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
4157 memcpy (contents
+ rel
->r_offset
- 2,
4158 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4159 /* Skip R_386_PC32/R_386_PLT32. */
4164 if (htab
->elf
.sgot
== NULL
)
4167 off
= htab
->tls_ldm_got
.offset
;
4172 Elf_Internal_Rela outrel
;
4175 if (htab
->elf
.srelgot
== NULL
)
4178 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4179 + htab
->elf
.sgot
->output_offset
+ off
);
4181 bfd_put_32 (output_bfd
, 0,
4182 htab
->elf
.sgot
->contents
+ off
);
4183 bfd_put_32 (output_bfd
, 0,
4184 htab
->elf
.sgot
->contents
+ off
+ 4);
4185 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
4186 loc
= htab
->elf
.srelgot
->contents
;
4187 loc
+= htab
->elf
.srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4188 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4189 htab
->tls_ldm_got
.offset
|= 1;
4191 relocation
= htab
->elf
.sgot
->output_section
->vma
4192 + htab
->elf
.sgot
->output_offset
+ off
4193 - htab
->elf
.sgotplt
->output_section
->vma
4194 - htab
->elf
.sgotplt
->output_offset
;
4195 unresolved_reloc
= FALSE
;
4198 case R_386_TLS_LDO_32
:
4199 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
4200 relocation
-= elf_i386_dtpoff_base (info
);
4202 /* When converting LDO to LE, we must negate. */
4203 relocation
= -elf_i386_tpoff (info
, relocation
);
4206 case R_386_TLS_LE_32
:
4208 if (!info
->executable
)
4210 Elf_Internal_Rela outrel
;
4214 outrel
.r_offset
= rel
->r_offset
4215 + input_section
->output_section
->vma
4216 + input_section
->output_offset
;
4217 if (h
!= NULL
&& h
->dynindx
!= -1)
4221 if (r_type
== R_386_TLS_LE_32
)
4222 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
4224 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
4225 sreloc
= elf_section_data (input_section
)->sreloc
;
4228 loc
= sreloc
->contents
;
4229 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4230 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4233 else if (r_type
== R_386_TLS_LE_32
)
4234 relocation
= elf_i386_dtpoff_base (info
) - relocation
;
4236 relocation
-= elf_i386_dtpoff_base (info
);
4238 else if (r_type
== R_386_TLS_LE_32
)
4239 relocation
= elf_i386_tpoff (info
, relocation
);
4241 relocation
= -elf_i386_tpoff (info
, relocation
);
4248 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4249 because such sections are not SEC_ALLOC and thus ld.so will
4250 not process them. */
4251 if (unresolved_reloc
4252 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4254 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4255 rel
->r_offset
) != (bfd_vma
) -1)
4257 (*_bfd_error_handler
)
4258 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4261 (long) rel
->r_offset
,
4263 h
->root
.root
.string
);
4268 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4269 contents
, rel
->r_offset
,
4272 check_relocation_error
:
4273 if (r
!= bfd_reloc_ok
)
4278 name
= h
->root
.root
.string
;
4281 name
= bfd_elf_string_from_elf_section (input_bfd
,
4282 symtab_hdr
->sh_link
,
4287 name
= bfd_section_name (input_bfd
, sec
);
4290 if (r
== bfd_reloc_overflow
)
4292 if (! ((*info
->callbacks
->reloc_overflow
)
4293 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4294 (bfd_vma
) 0, input_bfd
, input_section
,
4300 (*_bfd_error_handler
)
4301 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4302 input_bfd
, input_section
,
4303 (long) rel
->r_offset
, name
, (int) r
);
4312 /* Finish up dynamic symbol handling. We set the contents of various
4313 dynamic sections here. */
4316 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
4317 struct bfd_link_info
*info
,
4318 struct elf_link_hash_entry
*h
,
4319 Elf_Internal_Sym
*sym
)
4321 struct elf_i386_link_hash_table
*htab
;
4322 unsigned plt_entry_size
;
4323 const struct elf_i386_backend_data
*abed
;
4325 htab
= elf_i386_hash_table (info
);
4329 abed
= get_elf_i386_backend_data (output_bfd
);
4330 plt_entry_size
= GET_PLT_ENTRY_SIZE (output_bfd
);
4332 if (h
->plt
.offset
!= (bfd_vma
) -1)
4336 Elf_Internal_Rela rel
;
4338 asection
*plt
, *gotplt
, *relplt
;
4340 /* When building a static executable, use .iplt, .igot.plt and
4341 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4342 if (htab
->elf
.splt
!= NULL
)
4344 plt
= htab
->elf
.splt
;
4345 gotplt
= htab
->elf
.sgotplt
;
4346 relplt
= htab
->elf
.srelplt
;
4350 plt
= htab
->elf
.iplt
;
4351 gotplt
= htab
->elf
.igotplt
;
4352 relplt
= htab
->elf
.irelplt
;
4355 /* This symbol has an entry in the procedure linkage table. Set
4358 if ((h
->dynindx
== -1
4359 && !((h
->forced_local
|| info
->executable
)
4361 && h
->type
== STT_GNU_IFUNC
))
4367 /* Get the index in the procedure linkage table which
4368 corresponds to this symbol. This is the index of this symbol
4369 in all the symbols for which we are making plt entries. The
4370 first entry in the procedure linkage table is reserved.
4372 Get the offset into the .got table of the entry that
4373 corresponds to this function. Each .got entry is 4 bytes.
4374 The first three are reserved.
4376 For static executables, we don't reserve anything. */
4378 if (plt
== htab
->elf
.splt
)
4380 got_offset
= h
->plt
.offset
/ plt_entry_size
- 1;
4381 got_offset
= (got_offset
+ 3) * 4;
4385 got_offset
= h
->plt
.offset
/ plt_entry_size
;
4386 got_offset
= got_offset
* 4;
4389 /* Fill in the entry in the procedure linkage table. */
4392 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt
->plt_entry
,
4393 abed
->plt
->plt_entry_size
);
4394 bfd_put_32 (output_bfd
,
4395 (gotplt
->output_section
->vma
4396 + gotplt
->output_offset
4398 plt
->contents
+ h
->plt
.offset
4399 + abed
->plt
->plt_got_offset
);
4401 if (abed
->is_vxworks
)
4403 int s
, k
, reloc_index
;
4405 /* Create the R_386_32 relocation referencing the GOT
4406 for this PLT entry. */
4408 /* S: Current slot number (zero-based). */
4409 s
= ((h
->plt
.offset
- abed
->plt
->plt_entry_size
)
4410 / abed
->plt
->plt_entry_size
);
4411 /* K: Number of relocations for PLTResolve. */
4413 k
= PLTRESOLVE_RELOCS_SHLIB
;
4415 k
= PLTRESOLVE_RELOCS
;
4416 /* Skip the PLTresolve relocations, and the relocations for
4417 the other PLT slots. */
4418 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
4419 loc
= (htab
->srelplt2
->contents
+ reloc_index
4420 * sizeof (Elf32_External_Rel
));
4422 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
4423 + htab
->elf
.splt
->output_offset
4424 + h
->plt
.offset
+ 2),
4425 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4426 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4428 /* Create the R_386_32 relocation referencing the beginning of
4429 the PLT for this GOT entry. */
4430 rel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4431 + htab
->elf
.sgotplt
->output_offset
4433 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
4434 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4435 loc
+ sizeof (Elf32_External_Rel
));
4440 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt
->pic_plt_entry
,
4441 abed
->plt
->plt_entry_size
);
4442 bfd_put_32 (output_bfd
, got_offset
,
4443 plt
->contents
+ h
->plt
.offset
4444 + abed
->plt
->plt_got_offset
);
4447 /* Fill in the entry in the global offset table. */
4448 bfd_put_32 (output_bfd
,
4449 (plt
->output_section
->vma
4450 + plt
->output_offset
4452 + abed
->plt
->plt_lazy_offset
),
4453 gotplt
->contents
+ got_offset
);
4455 /* Fill in the entry in the .rel.plt section. */
4456 rel
.r_offset
= (gotplt
->output_section
->vma
4457 + gotplt
->output_offset
4459 if (h
->dynindx
== -1
4460 || ((info
->executable
4461 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4463 && h
->type
== STT_GNU_IFUNC
))
4465 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4466 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4467 in the .got.plt section. */
4468 bfd_put_32 (output_bfd
,
4469 (h
->root
.u
.def
.value
4470 + h
->root
.u
.def
.section
->output_section
->vma
4471 + h
->root
.u
.def
.section
->output_offset
),
4472 gotplt
->contents
+ got_offset
);
4473 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
4474 /* R_386_IRELATIVE comes last. */
4475 plt_index
= htab
->next_irelative_index
--;
4479 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
4480 plt_index
= htab
->next_jump_slot_index
++;
4482 loc
= relplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
4483 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4485 /* Don't fill PLT entry for static executables. */
4486 if (plt
== htab
->elf
.splt
)
4488 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
4489 plt
->contents
+ h
->plt
.offset
4490 + abed
->plt
->plt_reloc_offset
);
4491 bfd_put_32 (output_bfd
, - (h
->plt
.offset
4492 + abed
->plt
->plt_plt_offset
+ 4),
4493 plt
->contents
+ h
->plt
.offset
4494 + abed
->plt
->plt_plt_offset
);
4497 if (!h
->def_regular
)
4499 /* Mark the symbol as undefined, rather than as defined in
4500 the .plt section. Leave the value if there were any
4501 relocations where pointer equality matters (this is a clue
4502 for the dynamic linker, to make function pointer
4503 comparisons work between an application and shared
4504 library), otherwise set it to zero. If a function is only
4505 called from a binary, there is no need to slow down
4506 shared libraries because of that. */
4507 sym
->st_shndx
= SHN_UNDEF
;
4508 if (!h
->pointer_equality_needed
)
4513 if (h
->got
.offset
!= (bfd_vma
) -1
4514 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h
)->tls_type
)
4515 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
4517 Elf_Internal_Rela rel
;
4520 /* This symbol has an entry in the global offset table. Set it
4523 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4526 rel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4527 + htab
->elf
.sgot
->output_offset
4528 + (h
->got
.offset
& ~(bfd_vma
) 1));
4530 /* If this is a static link, or it is a -Bsymbolic link and the
4531 symbol is defined locally or was forced to be local because
4532 of a version file, we just want to emit a RELATIVE reloc.
4533 The entry in the global offset table will already have been
4534 initialized in the relocate_section function. */
4536 && h
->type
== STT_GNU_IFUNC
)
4540 /* Generate R_386_GLOB_DAT. */
4547 if (!h
->pointer_equality_needed
)
4550 /* For non-shared object, we can't use .got.plt, which
4551 contains the real function addres if we need pointer
4552 equality. We load the GOT entry with the PLT entry. */
4553 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4554 bfd_put_32 (output_bfd
,
4555 (plt
->output_section
->vma
4556 + plt
->output_offset
+ h
->plt
.offset
),
4557 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4561 else if (info
->shared
4562 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4564 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4565 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4569 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4571 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
4572 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4573 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
4576 loc
= htab
->elf
.srelgot
->contents
;
4577 loc
+= htab
->elf
.srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4578 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4583 Elf_Internal_Rela rel
;
4586 /* This symbol needs a copy reloc. Set it up. */
4588 if (h
->dynindx
== -1
4589 || (h
->root
.type
!= bfd_link_hash_defined
4590 && h
->root
.type
!= bfd_link_hash_defweak
)
4591 || htab
->srelbss
== NULL
)
4594 rel
.r_offset
= (h
->root
.u
.def
.value
4595 + h
->root
.u
.def
.section
->output_section
->vma
4596 + h
->root
.u
.def
.section
->output_offset
);
4597 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
4598 loc
= htab
->srelbss
->contents
;
4599 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4600 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4603 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4604 be NULL for local symbols.
4606 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4607 is relative to the ".got" section. */
4609 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4610 || (!abed
->is_vxworks
4611 && h
== htab
->elf
.hgot
)))
4612 sym
->st_shndx
= SHN_ABS
;
4617 /* Finish up local dynamic symbol handling. We set the contents of
4618 various dynamic sections here. */
4621 elf_i386_finish_local_dynamic_symbol (void **slot
, void *inf
)
4623 struct elf_link_hash_entry
*h
4624 = (struct elf_link_hash_entry
*) *slot
;
4625 struct bfd_link_info
*info
4626 = (struct bfd_link_info
*) inf
;
4628 return elf_i386_finish_dynamic_symbol (info
->output_bfd
, info
,
4632 /* Used to decide how to sort relocs in an optimal manner for the
4633 dynamic linker, before writing them out. */
4635 static enum elf_reloc_type_class
4636 elf_i386_reloc_type_class (const Elf_Internal_Rela
*rela
)
4638 switch (ELF32_R_TYPE (rela
->r_info
))
4640 case R_386_RELATIVE
:
4641 return reloc_class_relative
;
4642 case R_386_JUMP_SLOT
:
4643 return reloc_class_plt
;
4645 return reloc_class_copy
;
4647 return reloc_class_normal
;
4651 /* Finish up the dynamic sections. */
4654 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
4655 struct bfd_link_info
*info
)
4657 struct elf_i386_link_hash_table
*htab
;
4660 const struct elf_i386_backend_data
*abed
;
4662 htab
= elf_i386_hash_table (info
);
4666 dynobj
= htab
->elf
.dynobj
;
4667 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4668 abed
= get_elf_i386_backend_data (output_bfd
);
4670 if (htab
->elf
.dynamic_sections_created
)
4672 Elf32_External_Dyn
*dyncon
, *dynconend
;
4674 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4677 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
4678 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4679 for (; dyncon
< dynconend
; dyncon
++)
4681 Elf_Internal_Dyn dyn
;
4684 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4689 if (abed
->is_vxworks
4690 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
4695 s
= htab
->elf
.sgotplt
;
4696 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4700 s
= htab
->elf
.srelplt
;
4701 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4705 s
= htab
->elf
.srelplt
;
4706 dyn
.d_un
.d_val
= s
->size
;
4710 /* My reading of the SVR4 ABI indicates that the
4711 procedure linkage table relocs (DT_JMPREL) should be
4712 included in the overall relocs (DT_REL). This is
4713 what Solaris does. However, UnixWare can not handle
4714 that case. Therefore, we override the DT_RELSZ entry
4715 here to make it not include the JMPREL relocs. */
4716 s
= htab
->elf
.srelplt
;
4719 dyn
.d_un
.d_val
-= s
->size
;
4723 /* We may not be using the standard ELF linker script.
4724 If .rel.plt is the first .rel section, we adjust
4725 DT_REL to not include it. */
4726 s
= htab
->elf
.srelplt
;
4729 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
4731 dyn
.d_un
.d_ptr
+= s
->size
;
4735 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4738 /* Fill in the first entry in the procedure linkage table. */
4739 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4743 memcpy (htab
->elf
.splt
->contents
, abed
->plt
->pic_plt0_entry
,
4744 abed
->plt
->plt0_entry_size
);
4745 memset (htab
->elf
.splt
->contents
+ abed
->plt
->plt0_entry_size
,
4746 abed
->plt0_pad_byte
,
4747 abed
->plt
->plt_entry_size
- abed
->plt
->plt0_entry_size
);
4751 memcpy (htab
->elf
.splt
->contents
, abed
->plt
->plt0_entry
,
4752 abed
->plt
->plt0_entry_size
);
4753 memset (htab
->elf
.splt
->contents
+ abed
->plt
->plt0_entry_size
,
4754 abed
->plt0_pad_byte
,
4755 abed
->plt
->plt_entry_size
- abed
->plt
->plt0_entry_size
);
4756 bfd_put_32 (output_bfd
,
4757 (htab
->elf
.sgotplt
->output_section
->vma
4758 + htab
->elf
.sgotplt
->output_offset
4760 htab
->elf
.splt
->contents
4761 + abed
->plt
->plt0_got1_offset
);
4762 bfd_put_32 (output_bfd
,
4763 (htab
->elf
.sgotplt
->output_section
->vma
4764 + htab
->elf
.sgotplt
->output_offset
4766 htab
->elf
.splt
->contents
4767 + abed
->plt
->plt0_got2_offset
);
4769 if (abed
->is_vxworks
)
4771 Elf_Internal_Rela rel
;
4773 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4774 On IA32 we use REL relocations so the addend goes in
4775 the PLT directly. */
4776 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
4777 + htab
->elf
.splt
->output_offset
4778 + abed
->plt
->plt0_got1_offset
);
4779 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4780 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4781 htab
->srelplt2
->contents
);
4782 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4783 rel
.r_offset
= (htab
->elf
.splt
->output_section
->vma
4784 + htab
->elf
.splt
->output_offset
4785 + abed
->plt
->plt0_got2_offset
);
4786 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4787 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4788 htab
->srelplt2
->contents
+
4789 sizeof (Elf32_External_Rel
));
4793 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4794 really seem like the right value. */
4795 elf_section_data (htab
->elf
.splt
->output_section
)
4796 ->this_hdr
.sh_entsize
= 4;
4798 /* Correct the .rel.plt.unloaded relocations. */
4799 if (abed
->is_vxworks
&& !info
->shared
)
4801 int num_plts
= (htab
->elf
.splt
->size
4802 / abed
->plt
->plt_entry_size
) - 1;
4805 p
= htab
->srelplt2
->contents
;
4807 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
4809 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
4811 for (; num_plts
; num_plts
--)
4813 Elf_Internal_Rela rel
;
4814 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4815 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4816 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4817 p
+= sizeof (Elf32_External_Rel
);
4819 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4820 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
4821 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4822 p
+= sizeof (Elf32_External_Rel
);
4828 if (htab
->elf
.sgotplt
)
4830 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4832 (*_bfd_error_handler
)
4833 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4837 /* Fill in the first three entries in the global offset table. */
4838 if (htab
->elf
.sgotplt
->size
> 0)
4840 bfd_put_32 (output_bfd
,
4842 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
4843 htab
->elf
.sgotplt
->contents
);
4844 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 4);
4845 bfd_put_32 (output_bfd
, 0, htab
->elf
.sgotplt
->contents
+ 8);
4848 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
4851 /* Adjust .eh_frame for .plt section. */
4852 if (htab
->plt_eh_frame
!= NULL
)
4854 if (htab
->elf
.splt
!= NULL
4855 && htab
->elf
.splt
->size
!= 0
4856 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
4857 && htab
->elf
.splt
->output_section
!= NULL
4858 && htab
->plt_eh_frame
->output_section
!= NULL
)
4860 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
4861 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
4862 + htab
->plt_eh_frame
->output_offset
4863 + PLT_FDE_START_OFFSET
;
4864 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4865 htab
->plt_eh_frame
->contents
4866 + PLT_FDE_START_OFFSET
);
4868 if (htab
->plt_eh_frame
->sec_info_type
4869 == SEC_INFO_TYPE_EH_FRAME
)
4871 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4873 htab
->plt_eh_frame
->contents
))
4878 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4879 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4881 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4882 htab_traverse (htab
->loc_hash_table
,
4883 elf_i386_finish_local_dynamic_symbol
,
4889 /* Return address for Ith PLT stub in section PLT, for relocation REL
4890 or (bfd_vma) -1 if it should not be included. */
4893 elf_i386_plt_sym_val (bfd_vma i
, const asection
*plt
,
4894 const arelent
*rel ATTRIBUTE_UNUSED
)
4896 return plt
->vma
+ (i
+ 1) * GET_PLT_ENTRY_SIZE (plt
->owner
);
4899 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4902 elf_i386_hash_symbol (struct elf_link_hash_entry
*h
)
4904 if (h
->plt
.offset
!= (bfd_vma
) -1
4906 && !h
->pointer_equality_needed
)
4909 return _bfd_elf_hash_symbol (h
);
4912 /* Hook called by the linker routine which adds symbols from an object
4916 elf_i386_add_symbol_hook (bfd
* abfd
,
4917 struct bfd_link_info
* info ATTRIBUTE_UNUSED
,
4918 Elf_Internal_Sym
* sym
,
4919 const char ** namep ATTRIBUTE_UNUSED
,
4920 flagword
* flagsp ATTRIBUTE_UNUSED
,
4921 asection
** secp ATTRIBUTE_UNUSED
,
4922 bfd_vma
* valp ATTRIBUTE_UNUSED
)
4924 if ((abfd
->flags
& DYNAMIC
) == 0
4925 && (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
4926 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
))
4927 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
4932 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4933 #define TARGET_LITTLE_NAME "elf32-i386"
4934 #define ELF_ARCH bfd_arch_i386
4935 #define ELF_TARGET_ID I386_ELF_DATA
4936 #define ELF_MACHINE_CODE EM_386
4937 #define ELF_MAXPAGESIZE 0x1000
4939 #define elf_backend_can_gc_sections 1
4940 #define elf_backend_can_refcount 1
4941 #define elf_backend_want_got_plt 1
4942 #define elf_backend_plt_readonly 1
4943 #define elf_backend_want_plt_sym 0
4944 #define elf_backend_got_header_size 12
4945 #define elf_backend_plt_alignment 4
4947 /* Support RELA for objdump of prelink objects. */
4948 #define elf_info_to_howto elf_i386_info_to_howto_rel
4949 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4951 #define bfd_elf32_mkobject elf_i386_mkobject
4953 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4954 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4955 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4956 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4957 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4959 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4960 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4961 #define elf_backend_check_relocs elf_i386_check_relocs
4962 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4963 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4964 #define elf_backend_fake_sections elf_i386_fake_sections
4965 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4966 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4967 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4968 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4969 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4970 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4971 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4972 #define elf_backend_relocate_section elf_i386_relocate_section
4973 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4974 #define elf_backend_always_size_sections elf_i386_always_size_sections
4975 #define elf_backend_omit_section_dynsym \
4976 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4977 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4978 #define elf_backend_hash_symbol elf_i386_hash_symbol
4979 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4980 #undef elf_backend_post_process_headers
4981 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4983 #include "elf32-target.h"
4985 /* FreeBSD support. */
4987 #undef TARGET_LITTLE_SYM
4988 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4989 #undef TARGET_LITTLE_NAME
4990 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4992 #define ELF_OSABI ELFOSABI_FREEBSD
4994 /* The kernel recognizes executables as valid only if they carry a
4995 "FreeBSD" label in the ELF header. So we put this label on all
4996 executables and (for simplicity) also all other object files. */
4999 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
5001 _bfd_elf_set_osabi (abfd
, info
);
5003 #ifdef OLD_FREEBSD_ABI_LABEL
5004 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5005 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
5009 #undef elf_backend_post_process_headers
5010 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5012 #define elf32_bed elf32_i386_fbsd_bed
5014 #undef elf_backend_add_symbol_hook
5016 #include "elf32-target.h"
5020 #undef TARGET_LITTLE_SYM
5021 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5022 #undef TARGET_LITTLE_NAME
5023 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5025 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5026 objects won't be recognized. */
5030 #define elf32_bed elf32_i386_sol2_bed
5032 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5034 #undef elf_backend_static_tls_alignment
5035 #define elf_backend_static_tls_alignment 8
5037 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5039 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5041 #undef elf_backend_want_plt_sym
5042 #define elf_backend_want_plt_sym 1
5044 #include "elf32-target.h"
5046 /* Native Client support. */
5048 #undef TARGET_LITTLE_SYM
5049 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5050 #undef TARGET_LITTLE_NAME
5051 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5053 #define elf32_bed elf32_i386_nacl_bed
5055 #undef ELF_MAXPAGESIZE
5056 #define ELF_MAXPAGESIZE 0x10000
5058 /* Restore defaults. */
5060 #undef elf_backend_want_plt_sym
5061 #define elf_backend_want_plt_sym 0
5062 #undef elf_backend_post_process_headers
5063 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5064 #undef elf_backend_static_tls_alignment
5066 /* NaCl uses substantially different PLT entries for the same effects. */
5068 #undef elf_backend_plt_alignment
5069 #define elf_backend_plt_alignment 5
5070 #define NACL_PLT_ENTRY_SIZE 64
5071 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5073 static const bfd_byte elf_i386_nacl_plt0_entry
[] =
5075 0xff, 0x35, /* pushl contents of address */
5076 0, 0, 0, 0, /* replaced with address of .got + 4. */
5077 0x8b, 0x0d, /* movl contents of address, %ecx */
5078 0, 0, 0, 0, /* replaced with address of .got + 8. */
5079 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
5080 0xff, 0xe1 /* jmp *%ecx */
5083 static const bfd_byte elf_i386_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5085 0x8b, 0x0d, /* movl contents of address, %ecx */
5086 0, 0, 0, 0, /* replaced with GOT slot address. */
5087 0x83, 0xe1, NACLMASK
, /* andl $NACLMASK, %ecx */
5088 0xff, 0xe1, /* jmp *%ecx */
5090 /* Pad to the next 32-byte boundary with nop instructions. */
5092 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5093 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5095 /* Lazy GOT entries point here (32-byte aligned). */
5096 0x68, /* pushl immediate */
5097 0, 0, 0, 0, /* replaced with reloc offset. */
5098 0xe9, /* jmp relative */
5099 0, 0, 0, 0, /* replaced with offset to .plt. */
5101 /* Pad to the next 32-byte boundary with nop instructions. */
5102 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5103 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5107 static const bfd_byte
5108 elf_i386_nacl_pic_plt0_entry
[sizeof (elf_i386_nacl_plt0_entry
)] =
5110 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5111 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5112 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5113 0xff, 0xe1, /* jmp *%ecx */
5115 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5116 so pad to that size with nop instructions. */
5117 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5120 static const bfd_byte elf_i386_nacl_pic_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5122 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5123 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5124 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5125 0xff, 0xe1, /* jmp *%ecx */
5127 /* Pad to the next 32-byte boundary with nop instructions. */
5129 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5130 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5132 /* Lazy GOT entries point here (32-byte aligned). */
5133 0x68, /* pushl immediate */
5134 0, 0, 0, 0, /* replaced with offset into relocation table. */
5135 0xe9, /* jmp relative */
5136 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5138 /* Pad to the next 32-byte boundary with nop instructions. */
5139 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5140 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5144 static const bfd_byte elf_i386_nacl_eh_frame_plt
[] =
5146 #if (PLT_CIE_LENGTH != 20 \
5147 || PLT_FDE_LENGTH != 36 \
5148 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5149 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5150 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5152 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
5153 0, 0, 0, 0, /* CIE ID */
5154 1, /* CIE version */
5155 'z', 'R', 0, /* Augmentation string */
5156 1, /* Code alignment factor */
5157 0x7c, /* Data alignment factor: -4 */
5158 8, /* Return address column */
5159 1, /* Augmentation size */
5160 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
5161 DW_CFA_def_cfa
, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5162 DW_CFA_offset
+ 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5163 DW_CFA_nop
, DW_CFA_nop
,
5165 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
5166 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
5167 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5168 0, 0, 0, 0, /* .plt size goes here */
5169 0, /* Augmentation size */
5170 DW_CFA_def_cfa_offset
, 8, /* DW_CFA_def_cfa_offset: 8 */
5171 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5172 DW_CFA_def_cfa_offset
, 12, /* DW_CFA_def_cfa_offset: 12 */
5173 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5174 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
5175 13, /* Block length */
5176 DW_OP_breg4
, 4, /* DW_OP_breg4 (esp): 4 */
5177 DW_OP_breg8
, 0, /* DW_OP_breg8 (eip): 0 */
5178 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5179 DW_OP_lit2
, DW_OP_shl
, DW_OP_plus
,
5180 DW_CFA_nop
, DW_CFA_nop
5183 static const struct elf_i386_plt_layout elf_i386_nacl_plt
=
5185 elf_i386_nacl_plt0_entry
, /* plt0_entry */
5186 sizeof (elf_i386_nacl_plt0_entry
), /* plt0_entry_size */
5187 2, /* plt0_got1_offset */
5188 8, /* plt0_got2_offset */
5189 elf_i386_nacl_plt_entry
, /* plt_entry */
5190 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5191 2, /* plt_got_offset */
5192 33, /* plt_reloc_offset */
5193 38, /* plt_plt_offset */
5194 32, /* plt_lazy_offset */
5195 elf_i386_nacl_pic_plt0_entry
, /* pic_plt0_entry */
5196 elf_i386_nacl_pic_plt_entry
, /* pic_plt_entry */
5197 elf_i386_nacl_eh_frame_plt
, /* eh_frame_plt */
5198 sizeof (elf_i386_nacl_eh_frame_plt
),/* eh_frame_plt_size */
5201 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed
=
5203 &elf_i386_nacl_plt
, /* plt */
5204 0x90, /* plt0_pad_byte: nop insn */
5208 #undef elf_backend_arch_data
5209 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5211 #undef elf_backend_modify_segment_map
5212 #define elf_backend_modify_segment_map nacl_modify_segment_map
5213 #undef elf_backend_modify_program_headers
5214 #define elf_backend_modify_program_headers nacl_modify_program_headers
5216 #include "elf32-target.h"
5218 /* Restore defaults. */
5219 #undef elf_backend_modify_segment_map
5220 #undef elf_backend_modify_program_headers
5222 /* VxWorks support. */
5224 #undef TARGET_LITTLE_SYM
5225 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5226 #undef TARGET_LITTLE_NAME
5227 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5229 #undef elf_backend_plt_alignment
5230 #define elf_backend_plt_alignment 4
5232 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed
=
5234 &elf_i386_plt
, /* plt */
5235 0x90, /* plt0_pad_byte */
5239 #undef elf_backend_arch_data
5240 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5242 #undef elf_backend_relocs_compatible
5243 #undef elf_backend_post_process_headers
5244 #undef elf_backend_add_symbol_hook
5245 #define elf_backend_add_symbol_hook \
5246 elf_vxworks_add_symbol_hook
5247 #undef elf_backend_link_output_symbol_hook
5248 #define elf_backend_link_output_symbol_hook \
5249 elf_vxworks_link_output_symbol_hook
5250 #undef elf_backend_emit_relocs
5251 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5252 #undef elf_backend_final_write_processing
5253 #define elf_backend_final_write_processing \
5254 elf_vxworks_final_write_processing
5255 #undef elf_backend_static_tls_alignment
5257 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5259 #undef elf_backend_want_plt_sym
5260 #define elf_backend_want_plt_sym 1
5263 #define elf32_bed elf32_i386_vxworks_bed
5265 #include "elf32-target.h"