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 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
30 /* 386 uses REL relocations instead of RELA. */
35 static reloc_howto_type elf_howto_table
[]=
37 HOWTO(R_386_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_bitfield
,
38 bfd_elf_generic_reloc
, "R_386_NONE",
39 TRUE
, 0x00000000, 0x00000000, FALSE
),
40 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
41 bfd_elf_generic_reloc
, "R_386_32",
42 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
43 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
44 bfd_elf_generic_reloc
, "R_386_PC32",
45 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
46 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
47 bfd_elf_generic_reloc
, "R_386_GOT32",
48 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
49 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
50 bfd_elf_generic_reloc
, "R_386_PLT32",
51 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
52 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
53 bfd_elf_generic_reloc
, "R_386_COPY",
54 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
55 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
56 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
57 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
58 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
59 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
60 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
61 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_386_RELATIVE",
63 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
64 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
65 bfd_elf_generic_reloc
, "R_386_GOTOFF",
66 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
67 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
68 bfd_elf_generic_reloc
, "R_386_GOTPC",
69 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
71 /* We have a gap in the reloc numbers here.
72 R_386_standard counts the number up to this point, and
73 R_386_ext_offset is the value to subtract from a reloc type of
74 R_386_16 thru R_386_PC8 to form an index into this table. */
75 #define R_386_standard (R_386_GOTPC + 1)
76 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
78 /* These relocs are a GNU extension. */
79 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
81 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
82 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_386_TLS_IE",
84 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
85 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
86 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
87 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
88 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_386_TLS_LE",
90 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
91 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
92 bfd_elf_generic_reloc
, "R_386_TLS_GD",
93 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
94 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
96 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
97 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_386_16",
99 TRUE
, 0xffff, 0xffff, FALSE
),
100 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_386_PC16",
102 TRUE
, 0xffff, 0xffff, TRUE
),
103 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
104 bfd_elf_generic_reloc
, "R_386_8",
105 TRUE
, 0xff, 0xff, FALSE
),
106 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
107 bfd_elf_generic_reloc
, "R_386_PC8",
108 TRUE
, 0xff, 0xff, TRUE
),
110 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
111 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
112 /* These are common with Solaris TLS implementation. */
113 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
115 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
116 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
117 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
118 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
119 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
120 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
121 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
122 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
123 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
124 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
125 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
127 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
128 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
129 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
130 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
132 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
133 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
134 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
135 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
136 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
138 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
139 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
140 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
143 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
144 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
146 /* GNU extension to record C++ vtable hierarchy. */
147 HOWTO (R_386_GNU_VTINHERIT
, /* type */
149 2, /* size (0 = byte, 1 = short, 2 = long) */
151 FALSE
, /* pc_relative */
153 complain_overflow_dont
, /* complain_on_overflow */
154 NULL
, /* special_function */
155 "R_386_GNU_VTINHERIT", /* name */
156 FALSE
, /* partial_inplace */
159 FALSE
), /* pcrel_offset */
161 /* GNU extension to record C++ vtable member usage. */
162 HOWTO (R_386_GNU_VTENTRY
, /* type */
164 2, /* size (0 = byte, 1 = short, 2 = long) */
166 FALSE
, /* pc_relative */
168 complain_overflow_dont
, /* complain_on_overflow */
169 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
170 "R_386_GNU_VTENTRY", /* name */
171 FALSE
, /* partial_inplace */
174 FALSE
) /* pcrel_offset */
176 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
180 #ifdef DEBUG_GEN_RELOC
182 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
187 static reloc_howto_type
*
188 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
189 bfd_reloc_code_real_type code
)
194 TRACE ("BFD_RELOC_NONE");
195 return &elf_howto_table
[R_386_NONE
];
198 TRACE ("BFD_RELOC_32");
199 return &elf_howto_table
[R_386_32
];
202 TRACE ("BFD_RELOC_CTOR");
203 return &elf_howto_table
[R_386_32
];
205 case BFD_RELOC_32_PCREL
:
206 TRACE ("BFD_RELOC_PC32");
207 return &elf_howto_table
[R_386_PC32
];
209 case BFD_RELOC_386_GOT32
:
210 TRACE ("BFD_RELOC_386_GOT32");
211 return &elf_howto_table
[R_386_GOT32
];
213 case BFD_RELOC_386_PLT32
:
214 TRACE ("BFD_RELOC_386_PLT32");
215 return &elf_howto_table
[R_386_PLT32
];
217 case BFD_RELOC_386_COPY
:
218 TRACE ("BFD_RELOC_386_COPY");
219 return &elf_howto_table
[R_386_COPY
];
221 case BFD_RELOC_386_GLOB_DAT
:
222 TRACE ("BFD_RELOC_386_GLOB_DAT");
223 return &elf_howto_table
[R_386_GLOB_DAT
];
225 case BFD_RELOC_386_JUMP_SLOT
:
226 TRACE ("BFD_RELOC_386_JUMP_SLOT");
227 return &elf_howto_table
[R_386_JUMP_SLOT
];
229 case BFD_RELOC_386_RELATIVE
:
230 TRACE ("BFD_RELOC_386_RELATIVE");
231 return &elf_howto_table
[R_386_RELATIVE
];
233 case BFD_RELOC_386_GOTOFF
:
234 TRACE ("BFD_RELOC_386_GOTOFF");
235 return &elf_howto_table
[R_386_GOTOFF
];
237 case BFD_RELOC_386_GOTPC
:
238 TRACE ("BFD_RELOC_386_GOTPC");
239 return &elf_howto_table
[R_386_GOTPC
];
241 /* These relocs are a GNU extension. */
242 case BFD_RELOC_386_TLS_TPOFF
:
243 TRACE ("BFD_RELOC_386_TLS_TPOFF");
244 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
246 case BFD_RELOC_386_TLS_IE
:
247 TRACE ("BFD_RELOC_386_TLS_IE");
248 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
250 case BFD_RELOC_386_TLS_GOTIE
:
251 TRACE ("BFD_RELOC_386_TLS_GOTIE");
252 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
254 case BFD_RELOC_386_TLS_LE
:
255 TRACE ("BFD_RELOC_386_TLS_LE");
256 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
258 case BFD_RELOC_386_TLS_GD
:
259 TRACE ("BFD_RELOC_386_TLS_GD");
260 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
262 case BFD_RELOC_386_TLS_LDM
:
263 TRACE ("BFD_RELOC_386_TLS_LDM");
264 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
267 TRACE ("BFD_RELOC_16");
268 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
270 case BFD_RELOC_16_PCREL
:
271 TRACE ("BFD_RELOC_16_PCREL");
272 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
275 TRACE ("BFD_RELOC_8");
276 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
278 case BFD_RELOC_8_PCREL
:
279 TRACE ("BFD_RELOC_8_PCREL");
280 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
282 /* Common with Sun TLS implementation. */
283 case BFD_RELOC_386_TLS_LDO_32
:
284 TRACE ("BFD_RELOC_386_TLS_LDO_32");
285 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
287 case BFD_RELOC_386_TLS_IE_32
:
288 TRACE ("BFD_RELOC_386_TLS_IE_32");
289 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
291 case BFD_RELOC_386_TLS_LE_32
:
292 TRACE ("BFD_RELOC_386_TLS_LE_32");
293 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
295 case BFD_RELOC_386_TLS_DTPMOD32
:
296 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
297 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
299 case BFD_RELOC_386_TLS_DTPOFF32
:
300 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
301 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
303 case BFD_RELOC_386_TLS_TPOFF32
:
304 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
305 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
307 case BFD_RELOC_386_TLS_GOTDESC
:
308 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
309 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
311 case BFD_RELOC_386_TLS_DESC_CALL
:
312 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
313 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
315 case BFD_RELOC_386_TLS_DESC
:
316 TRACE ("BFD_RELOC_386_TLS_DESC");
317 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
319 case BFD_RELOC_VTABLE_INHERIT
:
320 TRACE ("BFD_RELOC_VTABLE_INHERIT");
321 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
323 case BFD_RELOC_VTABLE_ENTRY
:
324 TRACE ("BFD_RELOC_VTABLE_ENTRY");
325 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
335 static reloc_howto_type
*
336 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
341 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
342 if (elf_howto_table
[i
].name
!= NULL
343 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
344 return &elf_howto_table
[i
];
349 static reloc_howto_type
*
350 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
354 if ((indx
= r_type
) >= R_386_standard
355 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
356 >= R_386_ext
- R_386_standard
)
357 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
358 >= R_386_tls
- R_386_ext
)
359 && ((indx
= r_type
- R_386_vt_offset
) - R_386_tls
360 >= R_386_vt
- R_386_tls
))
362 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
366 BFD_ASSERT (elf_howto_table
[indx
].type
== r_type
);
367 return &elf_howto_table
[indx
];
371 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
373 Elf_Internal_Rela
*dst
)
375 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
376 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
379 /* Return whether a symbol name implies a local label. The UnixWare
380 2.1 cc generates temporary symbols that start with .X, so we
381 recognize them here. FIXME: do other SVR4 compilers also use .X?.
382 If so, we should move the .X recognition into
383 _bfd_elf_is_local_label_name. */
386 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
388 if (name
[0] == '.' && name
[1] == 'X')
391 return _bfd_elf_is_local_label_name (abfd
, name
);
394 /* Support for core dump NOTE sections. */
397 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
402 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
404 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
410 elf_tdata (abfd
)->core_signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
413 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
417 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
421 switch (note
->descsz
)
426 case 144: /* Linux/i386 */
428 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
431 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
441 /* Make a ".reg/999" section. */
442 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
443 size
, note
->descpos
+ offset
);
447 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
449 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
451 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
456 elf_tdata (abfd
)->core_program
457 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
458 elf_tdata (abfd
)->core_command
459 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
463 switch (note
->descsz
)
468 case 124: /* Linux/i386 elf_prpsinfo. */
469 elf_tdata (abfd
)->core_program
470 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
471 elf_tdata (abfd
)->core_command
472 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
476 /* Note that for some reason, a spurious space is tacked
477 onto the end of the args in some (at least one anyway)
478 implementations, so strip it off if it exists. */
480 char *command
= elf_tdata (abfd
)->core_command
;
481 int n
= strlen (command
);
483 if (0 < n
&& command
[n
- 1] == ' ')
484 command
[n
- 1] = '\0';
490 /* Functions for the i386 ELF linker.
492 In order to gain some understanding of code in this file without
493 knowing all the intricate details of the linker, note the
496 Functions named elf_i386_* are called by external routines, other
497 functions are only called locally. elf_i386_* functions appear
498 in this file more or less in the order in which they are called
499 from external routines. eg. elf_i386_check_relocs is called
500 early in the link process, elf_i386_finish_dynamic_sections is
501 one of the last functions. */
504 /* The name of the dynamic interpreter. This is put in the .interp
507 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
509 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
510 copying dynamic variables from a shared lib into an app's dynbss
511 section, and instead use a dynamic relocation to point into the
513 #define ELIMINATE_COPY_RELOCS 1
515 /* The size in bytes of an entry in the procedure linkage table. */
517 #define PLT_ENTRY_SIZE 16
519 /* The first entry in an absolute procedure linkage table looks like
520 this. See the SVR4 ABI i386 supplement to see how this works.
521 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
523 static const bfd_byte elf_i386_plt0_entry
[12] =
525 0xff, 0x35, /* pushl contents of address */
526 0, 0, 0, 0, /* replaced with address of .got + 4. */
527 0xff, 0x25, /* jmp indirect */
528 0, 0, 0, 0 /* replaced with address of .got + 8. */
531 /* Subsequent entries in an absolute procedure linkage table look like
534 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
538 0x68, /* pushl immediate */
539 0, 0, 0, 0, /* replaced with offset into relocation table. */
540 0xe9, /* jmp relative */
541 0, 0, 0, 0 /* replaced with offset to start of .plt. */
544 /* The first entry in a PIC procedure linkage table look like this.
545 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
547 static const bfd_byte elf_i386_pic_plt0_entry
[12] =
549 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
550 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
553 /* Subsequent entries in a PIC procedure linkage table look like this. */
555 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
557 0xff, 0xa3, /* jmp *offset(%ebx) */
558 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
559 0x68, /* pushl immediate */
560 0, 0, 0, 0, /* replaced with offset into relocation table. */
561 0xe9, /* jmp relative */
562 0, 0, 0, 0 /* replaced with offset to start of .plt. */
565 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
566 for the PLTResolve stub and then for each PLT entry. */
567 #define PLTRESOLVE_RELOCS_SHLIB 0
568 #define PLTRESOLVE_RELOCS 2
569 #define PLT_NON_JUMP_SLOT_RELOCS 2
571 /* The i386 linker needs to keep track of the number of relocs that it
572 decides to copy as dynamic relocs in check_relocs for each symbol.
573 This is so that it can later discard them if they are found to be
574 unnecessary. We store the information in a field extending the
575 regular ELF linker hash table. */
577 struct elf_i386_dyn_relocs
579 struct elf_i386_dyn_relocs
*next
;
581 /* The input section of the reloc. */
584 /* Total number of relocs copied for the input section. */
587 /* Number of pc-relative relocs copied for the input section. */
588 bfd_size_type pc_count
;
591 /* i386 ELF linker hash entry. */
593 struct elf_i386_link_hash_entry
595 struct elf_link_hash_entry elf
;
597 /* Track dynamic relocs copied for this symbol. */
598 struct elf_i386_dyn_relocs
*dyn_relocs
;
600 #define GOT_UNKNOWN 0
604 #define GOT_TLS_IE_POS 5
605 #define GOT_TLS_IE_NEG 6
606 #define GOT_TLS_IE_BOTH 7
607 #define GOT_TLS_GDESC 8
608 #define GOT_TLS_GD_BOTH_P(type) \
609 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
610 #define GOT_TLS_GD_P(type) \
611 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
612 #define GOT_TLS_GDESC_P(type) \
613 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
614 #define GOT_TLS_GD_ANY_P(type) \
615 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
616 unsigned char tls_type
;
618 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
619 starting at the end of the jump table. */
623 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
625 struct elf_i386_obj_tdata
627 struct elf_obj_tdata root
;
629 /* tls_type for each local got entry. */
630 char *local_got_tls_type
;
632 /* GOTPLT entries for TLS descriptors. */
633 bfd_vma
*local_tlsdesc_gotent
;
636 #define elf_i386_tdata(abfd) \
637 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
639 #define elf_i386_local_got_tls_type(abfd) \
640 (elf_i386_tdata (abfd)->local_got_tls_type)
642 #define elf_i386_local_tlsdesc_gotent(abfd) \
643 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
645 #define is_i386_elf(bfd) \
646 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
647 && elf_tdata (bfd) != NULL \
648 && elf_object_id (bfd) == I386_ELF_TDATA)
651 elf_i386_mkobject (bfd
*abfd
)
653 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_i386_obj_tdata
),
657 /* i386 ELF linker hash table. */
659 struct elf_i386_link_hash_table
661 struct elf_link_hash_table elf
;
663 /* Short-cuts to get to dynamic linker sections. */
672 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
675 /* True if the target system is VxWorks. */
678 /* Value used to fill the last word of the first plt entry. */
679 bfd_byte plt0_pad_byte
;
681 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
682 bfd_vma next_tls_desc_index
;
685 bfd_signed_vma refcount
;
689 /* The amount of space used by the reserved portion of the sgotplt
690 section, plus whatever space is used by the jump slots. */
691 bfd_vma sgotplt_jump_table_size
;
693 /* Small local sym to section mapping cache. */
694 struct sym_sec_cache sym_sec
;
696 /* _TLS_MODULE_BASE_ symbol. */
697 struct bfd_link_hash_entry
*tls_module_base
;
700 /* Get the i386 ELF linker hash table from a link_info structure. */
702 #define elf_i386_hash_table(p) \
703 ((struct elf_i386_link_hash_table *) ((p)->hash))
705 #define elf_i386_compute_jump_table_size(htab) \
706 ((htab)->next_tls_desc_index * 4)
708 /* Create an entry in an i386 ELF linker hash table. */
710 static struct bfd_hash_entry
*
711 link_hash_newfunc (struct bfd_hash_entry
*entry
,
712 struct bfd_hash_table
*table
,
715 /* Allocate the structure if it has not already been allocated by a
719 entry
= bfd_hash_allocate (table
,
720 sizeof (struct elf_i386_link_hash_entry
));
725 /* Call the allocation method of the superclass. */
726 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
729 struct elf_i386_link_hash_entry
*eh
;
731 eh
= (struct elf_i386_link_hash_entry
*) entry
;
732 eh
->dyn_relocs
= NULL
;
733 eh
->tls_type
= GOT_UNKNOWN
;
734 eh
->tlsdesc_got
= (bfd_vma
) -1;
740 /* Create an i386 ELF linker hash table. */
742 static struct bfd_link_hash_table
*
743 elf_i386_link_hash_table_create (bfd
*abfd
)
745 struct elf_i386_link_hash_table
*ret
;
746 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
748 ret
= bfd_malloc (amt
);
752 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
,
753 sizeof (struct elf_i386_link_hash_entry
)))
766 ret
->tls_ldm_got
.refcount
= 0;
767 ret
->next_tls_desc_index
= 0;
768 ret
->sgotplt_jump_table_size
= 0;
769 ret
->sym_sec
.abfd
= NULL
;
771 ret
->srelplt2
= NULL
;
772 ret
->plt0_pad_byte
= 0;
773 ret
->tls_module_base
= NULL
;
775 return &ret
->elf
.root
;
778 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
779 shortcuts to them in our hash table. */
782 create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
784 struct elf_i386_link_hash_table
*htab
;
786 if (! _bfd_elf_create_got_section (dynobj
, info
))
789 htab
= elf_i386_hash_table (info
);
790 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
791 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
792 if (!htab
->sgot
|| !htab
->sgotplt
)
795 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rel.got",
796 (SEC_ALLOC
| SEC_LOAD
801 if (htab
->srelgot
== NULL
802 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
807 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
808 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
812 elf_i386_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
814 struct elf_i386_link_hash_table
*htab
;
816 htab
= elf_i386_hash_table (info
);
817 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
820 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
823 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
824 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
825 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
827 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
829 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
830 || (!info
->shared
&& !htab
->srelbss
))
834 && !elf_vxworks_create_dynamic_sections (dynobj
, info
, &htab
->srelplt2
))
840 /* Copy the extra info we tack onto an elf_link_hash_entry. */
843 elf_i386_copy_indirect_symbol (struct bfd_link_info
*info
,
844 struct elf_link_hash_entry
*dir
,
845 struct elf_link_hash_entry
*ind
)
847 struct elf_i386_link_hash_entry
*edir
, *eind
;
849 edir
= (struct elf_i386_link_hash_entry
*) dir
;
850 eind
= (struct elf_i386_link_hash_entry
*) ind
;
852 if (eind
->dyn_relocs
!= NULL
)
854 if (edir
->dyn_relocs
!= NULL
)
856 struct elf_i386_dyn_relocs
**pp
;
857 struct elf_i386_dyn_relocs
*p
;
859 /* Add reloc counts against the indirect sym to the direct sym
860 list. Merge any entries against the same section. */
861 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
863 struct elf_i386_dyn_relocs
*q
;
865 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
866 if (q
->sec
== p
->sec
)
868 q
->pc_count
+= p
->pc_count
;
869 q
->count
+= p
->count
;
876 *pp
= edir
->dyn_relocs
;
879 edir
->dyn_relocs
= eind
->dyn_relocs
;
880 eind
->dyn_relocs
= NULL
;
883 if (ind
->root
.type
== bfd_link_hash_indirect
884 && dir
->got
.refcount
<= 0)
886 edir
->tls_type
= eind
->tls_type
;
887 eind
->tls_type
= GOT_UNKNOWN
;
890 if (ELIMINATE_COPY_RELOCS
891 && ind
->root
.type
!= bfd_link_hash_indirect
892 && dir
->dynamic_adjusted
)
894 /* If called to transfer flags for a weakdef during processing
895 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
896 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
897 dir
->ref_dynamic
|= ind
->ref_dynamic
;
898 dir
->ref_regular
|= ind
->ref_regular
;
899 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
900 dir
->needs_plt
|= ind
->needs_plt
;
901 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
904 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
914 /* Return TRUE if the TLS access code sequence support transition
918 elf_i386_check_tls_transition (bfd
*abfd
, asection
*sec
,
920 Elf_Internal_Shdr
*symtab_hdr
,
921 struct elf_link_hash_entry
**sym_hashes
,
923 const Elf_Internal_Rela
*rel
,
924 const Elf_Internal_Rela
*relend
)
926 unsigned int val
, type
;
927 unsigned long r_symndx
;
928 struct elf_link_hash_entry
*h
;
931 /* Get the section contents. */
932 if (contents
== NULL
)
934 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
935 contents
= elf_section_data (sec
)->this_hdr
.contents
;
938 /* FIXME: How to better handle error condition? */
939 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
942 /* Cache the section contents for elf_link_input_bfd. */
943 elf_section_data (sec
)->this_hdr
.contents
= contents
;
947 offset
= rel
->r_offset
;
952 if (offset
< 2 || (rel
+ 1) >= relend
)
955 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
956 if (r_type
== R_386_TLS_GD
)
958 /* Check transition from GD access model. Only
959 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
960 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
961 can transit to different access model. */
962 if ((offset
+ 10) > sec
->size
||
963 (type
!= 0x8d && type
!= 0x04))
966 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
969 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
973 if (bfd_get_8 (abfd
, contents
+ offset
- 3) != 0x8d)
976 if ((val
& 0xc7) != 0x05 || val
== (4 << 3))
981 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
982 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
985 if (bfd_get_8 (abfd
, contents
+ offset
+ 9) != 0x90)
991 /* Check transition from LD access model. Only
992 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
993 can transit to different access model. */
994 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
997 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
998 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1002 if (bfd_get_8 (abfd
, contents
+ offset
+ 4) != 0xe8)
1005 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
1006 if (r_symndx
< symtab_hdr
->sh_info
)
1009 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1010 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1011 may be versioned. */
1013 && h
->root
.root
.string
!= NULL
1014 && (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
1015 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
)
1016 && (strncmp (h
->root
.root
.string
, "___tls_get_addr",
1020 /* Check transition from IE access model:
1021 movl foo@indntpoff(%rip), %eax
1022 movl foo@indntpoff(%rip), %reg
1023 addl foo@indntpoff(%rip), %reg
1026 if (offset
< 1 || (offset
+ 4) > sec
->size
)
1029 /* Check "movl foo@tpoff(%rip), %eax" first. */
1030 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1037 /* Check movl|addl foo@tpoff(%rip), %reg. */
1038 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1039 return ((type
== 0x8b || type
== 0x03)
1040 && (val
& 0xc7) == 0x05);
1042 case R_386_TLS_GOTIE
:
1043 case R_386_TLS_IE_32
:
1044 /* Check transition from {IE_32,GOTIE} access model:
1045 subl foo@{tpoff,gontoff}(%reg1), %reg2
1046 movl foo@{tpoff,gontoff}(%reg1), %reg2
1047 addl foo@{tpoff,gontoff}(%reg1), %reg2
1050 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1053 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1054 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1057 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1058 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1060 case R_386_TLS_GOTDESC
:
1061 /* Check transition from GDesc access model:
1062 leal x@tlsdesc(%ebx), %eax
1064 Make sure it's a leal adding ebx to a 32-bit offset
1065 into any register, although it's probably almost always
1068 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1071 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1074 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1075 return (val
& 0xc7) == 0x83;
1077 case R_386_TLS_DESC_CALL
:
1078 /* Check transition from GDesc access model:
1079 call *x@tlsdesc(%rax)
1081 if (offset
+ 2 <= sec
->size
)
1083 /* Make sure that it's a call *x@tlsdesc(%rax). */
1084 static i386_opcode16 call
= { { 0xff, 0x10 } };
1085 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
1095 /* Return TRUE if the TLS access transition is OK or no transition
1096 will be performed. Update R_TYPE if there is a transition. */
1099 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1100 asection
*sec
, bfd_byte
*contents
,
1101 Elf_Internal_Shdr
*symtab_hdr
,
1102 struct elf_link_hash_entry
**sym_hashes
,
1103 unsigned int *r_type
, int tls_type
,
1104 const Elf_Internal_Rela
*rel
,
1105 const Elf_Internal_Rela
*relend
,
1106 struct elf_link_hash_entry
*h
)
1108 unsigned int from_type
= *r_type
;
1109 unsigned int to_type
= from_type
;
1110 bfd_boolean check
= TRUE
;
1115 case R_386_TLS_GOTDESC
:
1116 case R_386_TLS_DESC_CALL
:
1117 case R_386_TLS_IE_32
:
1119 case R_386_TLS_GOTIE
:
1123 to_type
= R_386_TLS_LE_32
;
1124 else if (from_type
!= R_386_TLS_IE
1125 && from_type
!= R_386_TLS_GOTIE
)
1126 to_type
= R_386_TLS_IE_32
;
1129 /* When we are called from elf_i386_relocate_section, CONTENTS
1130 isn't NULL and there may be additional transitions based on
1132 if (contents
!= NULL
)
1134 unsigned int new_to_type
= to_type
;
1139 && (tls_type
& GOT_TLS_IE
))
1140 new_to_type
= R_386_TLS_LE_32
;
1142 if (to_type
== R_386_TLS_GD
1143 || to_type
== R_386_TLS_GOTDESC
1144 || to_type
== R_386_TLS_DESC_CALL
)
1146 if (tls_type
== GOT_TLS_IE_POS
)
1147 new_to_type
= R_386_TLS_GOTIE
;
1148 else if (tls_type
& GOT_TLS_IE
)
1149 new_to_type
= R_386_TLS_IE_32
;
1152 /* We checked the transition before when we were called from
1153 elf_i386_check_relocs. We only want to check the new
1154 transition which hasn't been checked before. */
1155 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1156 to_type
= new_to_type
;
1163 to_type
= R_386_TLS_LE_32
;
1170 /* Return TRUE if there is no transition. */
1171 if (from_type
== to_type
)
1174 /* Check if the transition can be performed. */
1176 && ! elf_i386_check_tls_transition (abfd
, sec
, contents
,
1177 symtab_hdr
, sym_hashes
,
1178 from_type
, rel
, relend
))
1180 reloc_howto_type
*from
, *to
;
1182 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1183 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1185 (*_bfd_error_handler
)
1186 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1187 "in section `%A' failed"),
1188 abfd
, sec
, from
->name
, to
->name
,
1189 h
? h
->root
.root
.string
: "a local symbol",
1190 (unsigned long) rel
->r_offset
);
1191 bfd_set_error (bfd_error_bad_value
);
1199 /* Returns true if the hash entry refers to a symbol
1200 marked for indirect handling during reloc processing. */
1203 is_indirect_symbol (bfd
* abfd
, struct elf_link_hash_entry
* h
)
1205 const struct elf_backend_data
* bed
;
1207 if (abfd
== NULL
|| h
== NULL
)
1210 bed
= get_elf_backend_data (abfd
);
1212 return h
->type
== STT_GNU_IFUNC
1213 && (bed
->elf_osabi
== ELFOSABI_LINUX
1214 /* GNU/Linux is still using the default value 0. */
1215 || bed
->elf_osabi
== ELFOSABI_NONE
);
1218 /* Look through the relocs for a section during the first phase, and
1219 calculate needed space in the global offset table, procedure linkage
1220 table, and dynamic reloc sections. */
1223 elf_i386_check_relocs (bfd
*abfd
,
1224 struct bfd_link_info
*info
,
1226 const Elf_Internal_Rela
*relocs
)
1228 struct elf_i386_link_hash_table
*htab
;
1229 Elf_Internal_Shdr
*symtab_hdr
;
1230 struct elf_link_hash_entry
**sym_hashes
;
1231 const Elf_Internal_Rela
*rel
;
1232 const Elf_Internal_Rela
*rel_end
;
1235 if (info
->relocatable
)
1238 BFD_ASSERT (is_i386_elf (abfd
));
1240 htab
= elf_i386_hash_table (info
);
1241 symtab_hdr
= &elf_symtab_hdr (abfd
);
1242 sym_hashes
= elf_sym_hashes (abfd
);
1246 rel_end
= relocs
+ sec
->reloc_count
;
1247 for (rel
= relocs
; rel
< rel_end
; rel
++)
1249 unsigned int r_type
;
1250 unsigned long r_symndx
;
1251 struct elf_link_hash_entry
*h
;
1253 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1254 r_type
= ELF32_R_TYPE (rel
->r_info
);
1256 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1258 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1264 if (r_symndx
< symtab_hdr
->sh_info
)
1268 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1269 while (h
->root
.type
== bfd_link_hash_indirect
1270 || h
->root
.type
== bfd_link_hash_warning
)
1271 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1274 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1275 symtab_hdr
, sym_hashes
,
1276 &r_type
, GOT_UNKNOWN
,
1283 htab
->tls_ldm_got
.refcount
+= 1;
1287 /* This symbol requires a procedure linkage table entry. We
1288 actually build the entry in adjust_dynamic_symbol,
1289 because this might be a case of linking PIC code which is
1290 never referenced by a dynamic object, in which case we
1291 don't need to generate a procedure linkage table entry
1294 /* If this is a local symbol, we resolve it directly without
1295 creating a procedure linkage table entry. */
1300 h
->plt
.refcount
+= 1;
1303 case R_386_TLS_IE_32
:
1305 case R_386_TLS_GOTIE
:
1307 info
->flags
|= DF_STATIC_TLS
;
1312 case R_386_TLS_GOTDESC
:
1313 case R_386_TLS_DESC_CALL
:
1314 /* This symbol requires a global offset table entry. */
1316 int tls_type
, old_tls_type
;
1321 case R_386_GOT32
: tls_type
= GOT_NORMAL
; break;
1322 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
1323 case R_386_TLS_GOTDESC
:
1324 case R_386_TLS_DESC_CALL
:
1325 tls_type
= GOT_TLS_GDESC
; break;
1326 case R_386_TLS_IE_32
:
1327 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
1328 tls_type
= GOT_TLS_IE_NEG
;
1330 /* If this is a GD->IE transition, we may use either of
1331 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1332 tls_type
= GOT_TLS_IE
;
1335 case R_386_TLS_GOTIE
:
1336 tls_type
= GOT_TLS_IE_POS
; break;
1341 h
->got
.refcount
+= 1;
1342 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1346 bfd_signed_vma
*local_got_refcounts
;
1348 /* This is a global offset table entry for a local symbol. */
1349 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1350 if (local_got_refcounts
== NULL
)
1354 size
= symtab_hdr
->sh_info
;
1355 size
*= (sizeof (bfd_signed_vma
)
1356 + sizeof (bfd_vma
) + sizeof(char));
1357 local_got_refcounts
= bfd_zalloc (abfd
, size
);
1358 if (local_got_refcounts
== NULL
)
1360 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1361 elf_i386_local_tlsdesc_gotent (abfd
)
1362 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1363 elf_i386_local_got_tls_type (abfd
)
1364 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1366 local_got_refcounts
[r_symndx
] += 1;
1367 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
1370 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1371 tls_type
|= old_tls_type
;
1372 /* If a TLS symbol is accessed using IE at least once,
1373 there is no point to use dynamic model for it. */
1374 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1375 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1376 || (tls_type
& GOT_TLS_IE
) == 0))
1378 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
1379 tls_type
= old_tls_type
;
1380 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1381 && GOT_TLS_GD_ANY_P (tls_type
))
1382 tls_type
|= old_tls_type
;
1385 (*_bfd_error_handler
)
1386 (_("%B: `%s' accessed both as normal and "
1387 "thread local symbol"),
1389 h
? h
->root
.root
.string
: "<local>");
1394 if (old_tls_type
!= tls_type
)
1397 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
1399 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1407 if (htab
->sgot
== NULL
)
1409 if (htab
->elf
.dynobj
== NULL
)
1410 htab
->elf
.dynobj
= abfd
;
1411 if (!create_got_section (htab
->elf
.dynobj
, info
))
1414 if (r_type
!= R_386_TLS_IE
)
1418 case R_386_TLS_LE_32
:
1422 info
->flags
|= DF_STATIC_TLS
;
1427 if (h
!= NULL
&& !info
->shared
)
1429 /* If this reloc is in a read-only section, we might
1430 need a copy reloc. We can't check reliably at this
1431 stage whether the section is read-only, as input
1432 sections have not yet been mapped to output sections.
1433 Tentatively set the flag for now, and correct in
1434 adjust_dynamic_symbol. */
1437 /* We may need a .plt entry if the function this reloc
1438 refers to is in a shared lib. */
1439 h
->plt
.refcount
+= 1;
1440 if (r_type
!= R_386_PC32
)
1441 h
->pointer_equality_needed
= 1;
1444 /* If we are creating a shared library, and this is a reloc
1445 against a global symbol, or a non PC relative reloc
1446 against a local symbol, then we need to copy the reloc
1447 into the shared library. However, if we are linking with
1448 -Bsymbolic, we do not need to copy a reloc against a
1449 global symbol which is defined in an object we are
1450 including in the link (i.e., DEF_REGULAR is set). At
1451 this point we have not seen all the input files, so it is
1452 possible that DEF_REGULAR is not set now but will be set
1453 later (it is never cleared). In case of a weak definition,
1454 DEF_REGULAR may be cleared later by a strong definition in
1455 a shared library. We account for that possibility below by
1456 storing information in the relocs_copied field of the hash
1457 table entry. A similar situation occurs when creating
1458 shared libraries and symbol visibility changes render the
1461 If on the other hand, we are creating an executable, we
1462 may need to keep relocations for symbols satisfied by a
1463 dynamic library if we manage to avoid copy relocs for the
1466 && (sec
->flags
& SEC_ALLOC
) != 0
1467 && (r_type
!= R_386_PC32
1469 && (! SYMBOLIC_BIND (info
, h
)
1470 || h
->root
.type
== bfd_link_hash_defweak
1471 || !h
->def_regular
))))
1472 || (ELIMINATE_COPY_RELOCS
1474 && (sec
->flags
& SEC_ALLOC
) != 0
1476 && (h
->root
.type
== bfd_link_hash_defweak
1477 || !h
->def_regular
)))
1479 struct elf_i386_dyn_relocs
*p
;
1480 struct elf_i386_dyn_relocs
**head
;
1482 /* We must copy these reloc types into the output file.
1483 Create a reloc section in dynobj and make room for
1487 if (htab
->elf
.dynobj
== NULL
)
1488 htab
->elf
.dynobj
= abfd
;
1490 sreloc
= _bfd_elf_make_dynamic_reloc_section
1491 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
1496 /* Create the ifunc section as well, even if we have not encountered a
1497 indirect function symbol yet. We may not even see one in the input
1498 object file, but we can still encounter them in libraries. */
1499 (void) _bfd_elf_make_ifunc_reloc_section
1500 (abfd
, sec
, htab
->elf
.dynobj
, 2);
1503 /* If this is a global symbol, we count the number of
1504 relocations we need for this symbol. */
1507 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1512 /* Track dynamic relocs needed for local syms too.
1513 We really need local syms available to do this
1517 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1522 vpp
= &elf_section_data (s
)->local_dynrel
;
1523 head
= (struct elf_i386_dyn_relocs
**)vpp
;
1527 if (p
== NULL
|| p
->sec
!= sec
)
1529 bfd_size_type amt
= sizeof *p
;
1530 p
= bfd_alloc (htab
->elf
.dynobj
, amt
);
1541 if (r_type
== R_386_PC32
)
1546 /* This relocation describes the C++ object vtable hierarchy.
1547 Reconstruct it for later use during GC. */
1548 case R_386_GNU_VTINHERIT
:
1549 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1553 /* This relocation describes which C++ vtable entries are actually
1554 used. Record for later use during GC. */
1555 case R_386_GNU_VTENTRY
:
1556 BFD_ASSERT (h
!= NULL
);
1558 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1570 /* Return the section that should be marked against GC for a given
1574 elf_i386_gc_mark_hook (asection
*sec
,
1575 struct bfd_link_info
*info
,
1576 Elf_Internal_Rela
*rel
,
1577 struct elf_link_hash_entry
*h
,
1578 Elf_Internal_Sym
*sym
)
1581 switch (ELF32_R_TYPE (rel
->r_info
))
1583 case R_386_GNU_VTINHERIT
:
1584 case R_386_GNU_VTENTRY
:
1588 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1591 /* Update the got entry reference counts for the section being removed. */
1594 elf_i386_gc_sweep_hook (bfd
*abfd
,
1595 struct bfd_link_info
*info
,
1597 const Elf_Internal_Rela
*relocs
)
1599 Elf_Internal_Shdr
*symtab_hdr
;
1600 struct elf_link_hash_entry
**sym_hashes
;
1601 bfd_signed_vma
*local_got_refcounts
;
1602 const Elf_Internal_Rela
*rel
, *relend
;
1604 if (info
->relocatable
)
1607 elf_section_data (sec
)->local_dynrel
= NULL
;
1609 symtab_hdr
= &elf_symtab_hdr (abfd
);
1610 sym_hashes
= elf_sym_hashes (abfd
);
1611 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1613 relend
= relocs
+ sec
->reloc_count
;
1614 for (rel
= relocs
; rel
< relend
; rel
++)
1616 unsigned long r_symndx
;
1617 unsigned int r_type
;
1618 struct elf_link_hash_entry
*h
= NULL
;
1620 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1621 if (r_symndx
>= symtab_hdr
->sh_info
)
1623 struct elf_i386_link_hash_entry
*eh
;
1624 struct elf_i386_dyn_relocs
**pp
;
1625 struct elf_i386_dyn_relocs
*p
;
1627 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1628 while (h
->root
.type
== bfd_link_hash_indirect
1629 || h
->root
.type
== bfd_link_hash_warning
)
1630 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1631 eh
= (struct elf_i386_link_hash_entry
*) h
;
1633 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1636 /* Everything must go for SEC. */
1642 r_type
= ELF32_R_TYPE (rel
->r_info
);
1643 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1644 symtab_hdr
, sym_hashes
,
1645 &r_type
, GOT_UNKNOWN
,
1652 if (elf_i386_hash_table (info
)->tls_ldm_got
.refcount
> 0)
1653 elf_i386_hash_table (info
)->tls_ldm_got
.refcount
-= 1;
1657 case R_386_TLS_GOTDESC
:
1658 case R_386_TLS_DESC_CALL
:
1659 case R_386_TLS_IE_32
:
1661 case R_386_TLS_GOTIE
:
1665 if (h
->got
.refcount
> 0)
1666 h
->got
.refcount
-= 1;
1668 else if (local_got_refcounts
!= NULL
)
1670 if (local_got_refcounts
[r_symndx
] > 0)
1671 local_got_refcounts
[r_symndx
] -= 1;
1684 if (h
->plt
.refcount
> 0)
1685 h
->plt
.refcount
-= 1;
1697 /* Adjust a symbol defined by a dynamic object and referenced by a
1698 regular object. The current definition is in some section of the
1699 dynamic object, but we're not including those sections. We have to
1700 change the definition to something the rest of the link can
1704 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1705 struct elf_link_hash_entry
*h
)
1707 struct elf_i386_link_hash_table
*htab
;
1710 /* If this is a function, put it in the procedure linkage table. We
1711 will fill in the contents of the procedure linkage table later,
1712 when we know the address of the .got section. */
1713 if (h
->type
== STT_FUNC
1716 if (h
->plt
.refcount
<= 0
1717 || SYMBOL_CALLS_LOCAL (info
, h
)
1718 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1719 && h
->root
.type
== bfd_link_hash_undefweak
))
1721 /* This case can occur if we saw a PLT32 reloc in an input
1722 file, but the symbol was never referred to by a dynamic
1723 object, or if all references were garbage collected. In
1724 such a case, we don't actually need to build a procedure
1725 linkage table, and we can just do a PC32 reloc instead. */
1726 h
->plt
.offset
= (bfd_vma
) -1;
1733 /* It's possible that we incorrectly decided a .plt reloc was
1734 needed for an R_386_PC32 reloc to a non-function sym in
1735 check_relocs. We can't decide accurately between function and
1736 non-function syms in check-relocs; Objects loaded later in
1737 the link may change h->type. So fix it now. */
1738 h
->plt
.offset
= (bfd_vma
) -1;
1740 /* If this is a weak symbol, and there is a real definition, the
1741 processor independent code will have arranged for us to see the
1742 real definition first, and we can just use the same value. */
1743 if (h
->u
.weakdef
!= NULL
)
1745 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1746 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1747 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1748 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1749 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1750 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1754 /* This is a reference to a symbol defined by a dynamic object which
1755 is not a function. */
1757 /* If we are creating a shared library, we must presume that the
1758 only references to the symbol are via the global offset table.
1759 For such cases we need not do anything here; the relocations will
1760 be handled correctly by relocate_section. */
1764 /* If there are no references to this symbol that do not use the
1765 GOT, we don't need to generate a copy reloc. */
1766 if (!h
->non_got_ref
)
1769 /* If -z nocopyreloc was given, we won't generate them either. */
1770 if (info
->nocopyreloc
)
1776 htab
= elf_i386_hash_table (info
);
1778 /* If there aren't any dynamic relocs in read-only sections, then
1779 we can keep the dynamic relocs and avoid the copy reloc. This
1780 doesn't work on VxWorks, where we can not have dynamic relocations
1781 (other than copy and jump slot relocations) in an executable. */
1782 if (ELIMINATE_COPY_RELOCS
&& !htab
->is_vxworks
)
1784 struct elf_i386_link_hash_entry
* eh
;
1785 struct elf_i386_dyn_relocs
*p
;
1787 eh
= (struct elf_i386_link_hash_entry
*) h
;
1788 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1790 s
= p
->sec
->output_section
;
1791 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1804 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1805 h
->root
.root
.string
);
1809 /* We must allocate the symbol in our .dynbss section, which will
1810 become part of the .bss section of the executable. There will be
1811 an entry for this symbol in the .dynsym section. The dynamic
1812 object will contain position independent code, so all references
1813 from the dynamic object to this symbol will go through the global
1814 offset table. The dynamic linker will use the .dynsym entry to
1815 determine the address it must put in the global offset table, so
1816 both the dynamic object and the regular object will refer to the
1817 same memory location for the variable. */
1819 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1820 copy the initial value out of the dynamic object and into the
1821 runtime process image. */
1822 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1824 htab
->srelbss
->size
+= sizeof (Elf32_External_Rel
);
1830 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1833 /* Allocate space in .plt, .got and associated reloc sections for
1837 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
1839 struct bfd_link_info
*info
;
1840 struct elf_i386_link_hash_table
*htab
;
1841 struct elf_i386_link_hash_entry
*eh
;
1842 struct elf_i386_dyn_relocs
*p
;
1843 bfd_boolean use_indirect_section
= FALSE
;
1845 if (h
->root
.type
== bfd_link_hash_indirect
)
1848 if (h
->root
.type
== bfd_link_hash_warning
)
1849 /* When warning symbols are created, they **replace** the "real"
1850 entry in the hash table, thus we never get to see the real
1851 symbol in a hash traversal. So look at it now. */
1852 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1854 info
= (struct bfd_link_info
*) inf
;
1855 htab
= elf_i386_hash_table (info
);
1857 if (htab
->elf
.dynamic_sections_created
1858 && h
->plt
.refcount
> 0)
1860 /* Make sure this symbol is output as a dynamic symbol.
1861 Undefined weak syms won't yet be marked as dynamic. */
1862 if (h
->dynindx
== -1
1863 && !h
->forced_local
)
1865 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1870 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1872 asection
*s
= htab
->splt
;
1874 /* If this is the first .plt entry, make room for the special
1877 s
->size
+= PLT_ENTRY_SIZE
;
1879 h
->plt
.offset
= s
->size
;
1881 /* If this symbol is not defined in a regular file, and we are
1882 not generating a shared library, then set the symbol to this
1883 location in the .plt. This is required to make function
1884 pointers compare as equal between the normal executable and
1885 the shared library. */
1889 h
->root
.u
.def
.section
= s
;
1890 h
->root
.u
.def
.value
= h
->plt
.offset
;
1893 /* Make room for this entry. */
1894 s
->size
+= PLT_ENTRY_SIZE
;
1896 /* We also need to make an entry in the .got.plt section, which
1897 will be placed in the .got section by the linker script. */
1898 htab
->sgotplt
->size
+= 4;
1900 /* We also need to make an entry in the .rel.plt section. */
1901 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
1902 htab
->next_tls_desc_index
++;
1904 if (htab
->is_vxworks
&& !info
->shared
)
1906 /* VxWorks has a second set of relocations for each PLT entry
1907 in executables. They go in a separate relocation section,
1908 which is processed by the kernel loader. */
1910 /* There are two relocations for the initial PLT entry: an
1911 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1912 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1914 if (h
->plt
.offset
== PLT_ENTRY_SIZE
)
1915 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
1917 /* There are two extra relocations for each subsequent PLT entry:
1918 an R_386_32 relocation for the GOT entry, and an R_386_32
1919 relocation for the PLT entry. */
1921 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
1926 h
->plt
.offset
= (bfd_vma
) -1;
1932 h
->plt
.offset
= (bfd_vma
) -1;
1936 eh
= (struct elf_i386_link_hash_entry
*) h
;
1937 eh
->tlsdesc_got
= (bfd_vma
) -1;
1939 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1940 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1941 if (h
->got
.refcount
> 0
1944 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
1945 h
->got
.offset
= (bfd_vma
) -1;
1946 else if (h
->got
.refcount
> 0)
1950 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1952 /* Make sure this symbol is output as a dynamic symbol.
1953 Undefined weak syms won't yet be marked as dynamic. */
1954 if (h
->dynindx
== -1
1955 && !h
->forced_local
)
1957 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1962 if (GOT_TLS_GDESC_P (tls_type
))
1964 eh
->tlsdesc_got
= htab
->sgotplt
->size
1965 - elf_i386_compute_jump_table_size (htab
);
1966 htab
->sgotplt
->size
+= 8;
1967 h
->got
.offset
= (bfd_vma
) -2;
1969 if (! GOT_TLS_GDESC_P (tls_type
)
1970 || GOT_TLS_GD_P (tls_type
))
1972 h
->got
.offset
= s
->size
;
1974 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1975 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
1978 dyn
= htab
->elf
.dynamic_sections_created
;
1979 /* R_386_TLS_IE_32 needs one dynamic relocation,
1980 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1981 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1982 need two), R_386_TLS_GD needs one if local symbol and two if
1984 if (tls_type
== GOT_TLS_IE_BOTH
)
1985 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
1986 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
1987 || (tls_type
& GOT_TLS_IE
))
1988 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
1989 else if (GOT_TLS_GD_P (tls_type
))
1990 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
1991 else if (! GOT_TLS_GDESC_P (tls_type
)
1992 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1993 || h
->root
.type
!= bfd_link_hash_undefweak
)
1995 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1996 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
1997 if (GOT_TLS_GDESC_P (tls_type
))
1998 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
2001 h
->got
.offset
= (bfd_vma
) -1;
2003 if (eh
->dyn_relocs
== NULL
)
2006 /* In the shared -Bsymbolic case, discard space allocated for
2007 dynamic pc-relative relocs against symbols which turn out to be
2008 defined in regular objects. For the normal shared case, discard
2009 space for pc-relative relocs that have become local due to symbol
2010 visibility changes. */
2014 /* The only reloc that uses pc_count is R_386_PC32, which will
2015 appear on a call or on something like ".long foo - .". We
2016 want calls to protected symbols to resolve directly to the
2017 function rather than going via the plt. If people want
2018 function pointer comparisons to work as expected then they
2019 should avoid writing assembly like ".long foo - .". */
2020 if (SYMBOL_CALLS_LOCAL (info
, h
))
2022 struct elf_i386_dyn_relocs
**pp
;
2024 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2026 p
->count
-= p
->pc_count
;
2035 if (htab
->is_vxworks
)
2037 struct elf_i386_dyn_relocs
**pp
;
2038 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2040 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
2047 /* Also discard relocs on undefined weak syms with non-default
2049 if (eh
->dyn_relocs
!= NULL
2050 && h
->root
.type
== bfd_link_hash_undefweak
)
2052 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2053 eh
->dyn_relocs
= NULL
;
2055 /* Make sure undefined weak symbols are output as a dynamic
2057 else if (h
->dynindx
== -1
2058 && !h
->forced_local
)
2060 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2065 else if (is_indirect_symbol (info
->output_bfd
, h
)
2067 && ! h
->forced_local
)
2069 if (bfd_elf_link_record_dynamic_symbol (info
, h
)
2070 && h
->dynindx
!= -1)
2071 use_indirect_section
= TRUE
;
2075 else if (ELIMINATE_COPY_RELOCS
)
2077 /* For the non-shared case, discard space for relocs against
2078 symbols which turn out to need copy relocs or are not
2084 || (htab
->elf
.dynamic_sections_created
2085 && (h
->root
.type
== bfd_link_hash_undefweak
2086 || h
->root
.type
== bfd_link_hash_undefined
))))
2088 /* Make sure this symbol is output as a dynamic symbol.
2089 Undefined weak syms won't yet be marked as dynamic. */
2090 if (h
->dynindx
== -1
2091 && !h
->forced_local
)
2093 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2097 /* If that succeeded, we know we'll be keeping all the
2099 if (h
->dynindx
!= -1)
2103 eh
->dyn_relocs
= NULL
;
2108 /* Finally, allocate space. */
2109 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2113 if (use_indirect_section
)
2114 sreloc
= elf_section_data (p
->sec
)->indirect_relocs
;
2116 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2118 BFD_ASSERT (sreloc
!= NULL
);
2119 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2125 /* Find any dynamic relocs that apply to read-only sections. */
2128 readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2130 struct elf_i386_link_hash_entry
*eh
;
2131 struct elf_i386_dyn_relocs
*p
;
2133 if (h
->root
.type
== bfd_link_hash_warning
)
2134 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2136 eh
= (struct elf_i386_link_hash_entry
*) h
;
2137 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2139 asection
*s
= p
->sec
->output_section
;
2141 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2143 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2145 info
->flags
|= DF_TEXTREL
;
2147 /* Not an error, just cut short the traversal. */
2154 /* Set the sizes of the dynamic sections. */
2157 elf_i386_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2158 struct bfd_link_info
*info
)
2160 struct elf_i386_link_hash_table
*htab
;
2166 htab
= elf_i386_hash_table (info
);
2167 dynobj
= htab
->elf
.dynobj
;
2171 if (htab
->elf
.dynamic_sections_created
)
2173 /* Set the contents of the .interp section to the interpreter. */
2174 if (info
->executable
)
2176 s
= bfd_get_section_by_name (dynobj
, ".interp");
2179 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2180 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2184 /* Set up .got offsets for local syms, and space for local dynamic
2186 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2188 bfd_signed_vma
*local_got
;
2189 bfd_signed_vma
*end_local_got
;
2190 char *local_tls_type
;
2191 bfd_vma
*local_tlsdesc_gotent
;
2192 bfd_size_type locsymcount
;
2193 Elf_Internal_Shdr
*symtab_hdr
;
2196 if (! is_i386_elf (ibfd
))
2199 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2201 struct elf_i386_dyn_relocs
*p
;
2203 for (p
= ((struct elf_i386_dyn_relocs
*)
2204 elf_section_data (s
)->local_dynrel
);
2208 if (!bfd_is_abs_section (p
->sec
)
2209 && bfd_is_abs_section (p
->sec
->output_section
))
2211 /* Input section has been discarded, either because
2212 it is a copy of a linkonce section or due to
2213 linker script /DISCARD/, so we'll be discarding
2216 else if (htab
->is_vxworks
2217 && strcmp (p
->sec
->output_section
->name
,
2220 /* Relocations in vxworks .tls_vars sections are
2221 handled specially by the loader. */
2223 else if (p
->count
!= 0)
2225 srel
= elf_section_data (p
->sec
)->sreloc
;
2226 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2227 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2228 info
->flags
|= DF_TEXTREL
;
2233 local_got
= elf_local_got_refcounts (ibfd
);
2237 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2238 locsymcount
= symtab_hdr
->sh_info
;
2239 end_local_got
= local_got
+ locsymcount
;
2240 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
2241 local_tlsdesc_gotent
= elf_i386_local_tlsdesc_gotent (ibfd
);
2243 srel
= htab
->srelgot
;
2244 for (; local_got
< end_local_got
;
2245 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2247 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2250 if (GOT_TLS_GDESC_P (*local_tls_type
))
2252 *local_tlsdesc_gotent
= htab
->sgotplt
->size
2253 - elf_i386_compute_jump_table_size (htab
);
2254 htab
->sgotplt
->size
+= 8;
2255 *local_got
= (bfd_vma
) -2;
2257 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2258 || GOT_TLS_GD_P (*local_tls_type
))
2260 *local_got
= s
->size
;
2262 if (GOT_TLS_GD_P (*local_tls_type
)
2263 || *local_tls_type
== GOT_TLS_IE_BOTH
)
2267 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2268 || (*local_tls_type
& GOT_TLS_IE
))
2270 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
2271 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
2272 else if (GOT_TLS_GD_P (*local_tls_type
)
2273 || ! GOT_TLS_GDESC_P (*local_tls_type
))
2274 srel
->size
+= sizeof (Elf32_External_Rel
);
2275 if (GOT_TLS_GDESC_P (*local_tls_type
))
2276 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
2280 *local_got
= (bfd_vma
) -1;
2284 if (htab
->tls_ldm_got
.refcount
> 0)
2286 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2288 htab
->tls_ldm_got
.offset
= htab
->sgot
->size
;
2289 htab
->sgot
->size
+= 8;
2290 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
2293 htab
->tls_ldm_got
.offset
= -1;
2295 /* Allocate global sym .plt and .got entries, and space for global
2296 sym dynamic relocs. */
2297 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, info
);
2299 /* For every jump slot reserved in the sgotplt, reloc_count is
2300 incremented. However, when we reserve space for TLS descriptors,
2301 it's not incremented, so in order to compute the space reserved
2302 for them, it suffices to multiply the reloc count by the jump
2305 htab
->sgotplt_jump_table_size
= htab
->next_tls_desc_index
* 4;
2307 /* We now have determined the sizes of the various dynamic sections.
2308 Allocate memory for them. */
2310 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2312 bfd_boolean strip_section
= TRUE
;
2314 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2319 || s
== htab
->sgotplt
2320 || s
== htab
->sdynbss
)
2322 /* Strip this section if we don't need it; see the
2324 /* We'd like to strip these sections if they aren't needed, but if
2325 we've exported dynamic symbols from them we must leave them.
2326 It's too late to tell BFD to get rid of the symbols. */
2328 if (htab
->elf
.hplt
!= NULL
)
2329 strip_section
= FALSE
;
2331 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rel"))
2333 if (s
->size
!= 0 && s
!= htab
->srelplt
&& s
!= htab
->srelplt2
)
2336 /* We use the reloc_count field as a counter if we need
2337 to copy relocs into the output file. */
2342 /* It's not one of our sections, so don't allocate space. */
2348 /* If we don't need this section, strip it from the
2349 output file. This is mostly to handle .rel.bss and
2350 .rel.plt. We must create both sections in
2351 create_dynamic_sections, because they must be created
2352 before the linker maps input sections to output
2353 sections. The linker does that before
2354 adjust_dynamic_symbol is called, and it is that
2355 function which decides whether anything needs to go
2356 into these sections. */
2358 s
->flags
|= SEC_EXCLUDE
;
2362 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2365 /* Allocate memory for the section contents. We use bfd_zalloc
2366 here in case unused entries are not reclaimed before the
2367 section's contents are written out. This should not happen,
2368 but this way if it does, we get a R_386_NONE reloc instead
2370 s
->contents
= bfd_zalloc (dynobj
, s
->size
);
2371 if (s
->contents
== NULL
)
2375 if (htab
->elf
.dynamic_sections_created
)
2377 /* Add some entries to the .dynamic section. We fill in the
2378 values later, in elf_i386_finish_dynamic_sections, but we
2379 must add the entries now so that we get the correct size for
2380 the .dynamic section. The DT_DEBUG entry is filled in by the
2381 dynamic linker and used by the debugger. */
2382 #define add_dynamic_entry(TAG, VAL) \
2383 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2385 if (info
->executable
)
2387 if (!add_dynamic_entry (DT_DEBUG
, 0))
2391 if (htab
->splt
->size
!= 0)
2393 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2394 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2395 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
2396 || !add_dynamic_entry (DT_JMPREL
, 0))
2402 if (!add_dynamic_entry (DT_REL
, 0)
2403 || !add_dynamic_entry (DT_RELSZ
, 0)
2404 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
2407 /* If any dynamic relocs apply to a read-only section,
2408 then we need a DT_TEXTREL entry. */
2409 if ((info
->flags
& DF_TEXTREL
) == 0)
2410 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
, info
);
2412 if ((info
->flags
& DF_TEXTREL
) != 0)
2414 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2418 if (htab
->is_vxworks
2419 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
2422 #undef add_dynamic_entry
2428 elf_i386_always_size_sections (bfd
*output_bfd
,
2429 struct bfd_link_info
*info
)
2431 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2435 struct elf_link_hash_entry
*tlsbase
;
2437 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2438 "_TLS_MODULE_BASE_",
2439 FALSE
, FALSE
, FALSE
);
2441 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2443 struct bfd_link_hash_entry
*bh
= NULL
;
2444 const struct elf_backend_data
*bed
2445 = get_elf_backend_data (output_bfd
);
2447 if (!(_bfd_generic_link_add_one_symbol
2448 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2449 tls_sec
, 0, NULL
, FALSE
,
2450 bed
->collect
, &bh
)))
2453 elf_i386_hash_table (info
)->tls_module_base
= bh
;
2455 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2456 tlsbase
->def_regular
= 1;
2457 tlsbase
->other
= STV_HIDDEN
;
2458 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2465 /* Set the correct type for an x86 ELF section. We do this by the
2466 section name, which is a hack, but ought to work. */
2469 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
2470 Elf_Internal_Shdr
*hdr
,
2473 register const char *name
;
2475 name
= bfd_get_section_name (abfd
, sec
);
2477 /* This is an ugly, but unfortunately necessary hack that is
2478 needed when producing EFI binaries on x86. It tells
2479 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2480 containing ELF relocation info. We need this hack in order to
2481 be able to generate ELF binaries that can be translated into
2482 EFI applications (which are essentially COFF objects). Those
2483 files contain a COFF ".reloc" section inside an ELFNN object,
2484 which would normally cause BFD to segfault because it would
2485 attempt to interpret this section as containing relocation
2486 entries for section "oc". With this hack enabled, ".reloc"
2487 will be treated as a normal data section, which will avoid the
2488 segfault. However, you won't be able to create an ELFNN binary
2489 with a section named "oc" that needs relocations, but that's
2490 the kind of ugly side-effects you get when detecting section
2491 types based on their names... In practice, this limitation is
2492 unlikely to bite. */
2493 if (strcmp (name
, ".reloc") == 0)
2494 hdr
->sh_type
= SHT_PROGBITS
;
2499 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2500 executables. Rather than setting it to the beginning of the TLS
2501 section, we have to set it to the end. This function may be called
2502 multiple times, it is idempotent. */
2505 set_tls_module_base (struct bfd_link_info
*info
)
2507 struct bfd_link_hash_entry
*base
;
2509 if (!info
->executable
)
2512 base
= elf_i386_hash_table (info
)->tls_module_base
;
2517 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2520 /* Return the base VMA address which should be subtracted from real addresses
2521 when resolving @dtpoff relocation.
2522 This is PT_TLS segment p_vaddr. */
2525 dtpoff_base (struct bfd_link_info
*info
)
2527 /* If tls_sec is NULL, we should have signalled an error already. */
2528 if (elf_hash_table (info
)->tls_sec
== NULL
)
2530 return elf_hash_table (info
)->tls_sec
->vma
;
2533 /* Return the relocation value for @tpoff relocation
2534 if STT_TLS virtual address is ADDRESS. */
2537 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2539 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2541 /* If tls_sec is NULL, we should have signalled an error already. */
2542 if (htab
->tls_sec
== NULL
)
2544 return htab
->tls_size
+ htab
->tls_sec
->vma
- address
;
2547 /* Relocate an i386 ELF section. */
2550 elf_i386_relocate_section (bfd
*output_bfd
,
2551 struct bfd_link_info
*info
,
2553 asection
*input_section
,
2555 Elf_Internal_Rela
*relocs
,
2556 Elf_Internal_Sym
*local_syms
,
2557 asection
**local_sections
)
2559 struct elf_i386_link_hash_table
*htab
;
2560 Elf_Internal_Shdr
*symtab_hdr
;
2561 struct elf_link_hash_entry
**sym_hashes
;
2562 bfd_vma
*local_got_offsets
;
2563 bfd_vma
*local_tlsdesc_gotents
;
2564 Elf_Internal_Rela
*rel
;
2565 Elf_Internal_Rela
*relend
;
2566 bfd_boolean is_vxworks_tls
;
2568 BFD_ASSERT (is_i386_elf (input_bfd
));
2570 htab
= elf_i386_hash_table (info
);
2571 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2572 sym_hashes
= elf_sym_hashes (input_bfd
);
2573 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2574 local_tlsdesc_gotents
= elf_i386_local_tlsdesc_gotent (input_bfd
);
2575 /* We have to handle relocations in vxworks .tls_vars sections
2576 specially, because the dynamic loader is 'weird'. */
2577 is_vxworks_tls
= (htab
->is_vxworks
&& info
->shared
2578 && !strcmp (input_section
->output_section
->name
,
2581 set_tls_module_base (info
);
2584 relend
= relocs
+ input_section
->reloc_count
;
2585 for (; rel
< relend
; rel
++)
2587 unsigned int r_type
;
2588 reloc_howto_type
*howto
;
2589 unsigned long r_symndx
;
2590 struct elf_link_hash_entry
*h
;
2591 Elf_Internal_Sym
*sym
;
2593 bfd_vma off
, offplt
;
2595 bfd_boolean unresolved_reloc
;
2596 bfd_reloc_status_type r
;
2600 r_type
= ELF32_R_TYPE (rel
->r_info
);
2601 if (r_type
== R_386_GNU_VTINHERIT
2602 || r_type
== R_386_GNU_VTENTRY
)
2605 if ((indx
= r_type
) >= R_386_standard
2606 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
2607 >= R_386_ext
- R_386_standard
)
2608 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
2609 >= R_386_tls
- R_386_ext
))
2611 (*_bfd_error_handler
)
2612 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2613 input_bfd
, input_section
, r_type
);
2614 bfd_set_error (bfd_error_bad_value
);
2617 howto
= elf_howto_table
+ indx
;
2619 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2623 unresolved_reloc
= FALSE
;
2624 if (r_symndx
< symtab_hdr
->sh_info
)
2626 sym
= local_syms
+ r_symndx
;
2627 sec
= local_sections
[r_symndx
];
2628 relocation
= (sec
->output_section
->vma
2629 + sec
->output_offset
2632 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
2633 && ((sec
->flags
& SEC_MERGE
) != 0
2634 || (info
->relocatable
2635 && sec
->output_offset
!= 0)))
2638 bfd_byte
*where
= contents
+ rel
->r_offset
;
2640 switch (howto
->size
)
2643 addend
= bfd_get_8 (input_bfd
, where
);
2644 if (howto
->pc_relative
)
2646 addend
= (addend
^ 0x80) - 0x80;
2651 addend
= bfd_get_16 (input_bfd
, where
);
2652 if (howto
->pc_relative
)
2654 addend
= (addend
^ 0x8000) - 0x8000;
2659 addend
= bfd_get_32 (input_bfd
, where
);
2660 if (howto
->pc_relative
)
2662 addend
= (addend
^ 0x80000000) - 0x80000000;
2670 if (info
->relocatable
)
2671 addend
+= sec
->output_offset
;
2674 asection
*msec
= sec
;
2675 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
2677 addend
-= relocation
;
2678 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2681 switch (howto
->size
)
2684 /* FIXME: overflow checks. */
2685 if (howto
->pc_relative
)
2687 bfd_put_8 (input_bfd
, addend
, where
);
2690 if (howto
->pc_relative
)
2692 bfd_put_16 (input_bfd
, addend
, where
);
2695 if (howto
->pc_relative
)
2697 bfd_put_32 (input_bfd
, addend
, where
);
2706 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2707 r_symndx
, symtab_hdr
, sym_hashes
,
2709 unresolved_reloc
, warned
);
2712 if (sec
!= NULL
&& elf_discarded_section (sec
))
2714 /* For relocs against symbols from removed linkonce sections,
2715 or sections discarded by a linker script, we just want the
2716 section contents zeroed. Avoid any special processing. */
2717 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2723 if (info
->relocatable
)
2729 /* Relocation is to the entry for this symbol in the global
2731 if (htab
->sgot
== NULL
)
2738 off
= h
->got
.offset
;
2739 dyn
= htab
->elf
.dynamic_sections_created
;
2740 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2742 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2743 || (ELF_ST_VISIBILITY (h
->other
)
2744 && h
->root
.type
== bfd_link_hash_undefweak
))
2746 /* This is actually a static link, or it is a
2747 -Bsymbolic link and the symbol is defined
2748 locally, or the symbol was forced to be local
2749 because of a version file. We must initialize
2750 this entry in the global offset table. Since the
2751 offset must always be a multiple of 4, we use the
2752 least significant bit to record whether we have
2753 initialized it already.
2755 When doing a dynamic link, we create a .rel.got
2756 relocation entry to initialize the value. This
2757 is done in the finish_dynamic_symbol routine. */
2762 bfd_put_32 (output_bfd
, relocation
,
2763 htab
->sgot
->contents
+ off
);
2768 unresolved_reloc
= FALSE
;
2772 if (local_got_offsets
== NULL
)
2775 off
= local_got_offsets
[r_symndx
];
2777 /* The offset must always be a multiple of 4. We use
2778 the least significant bit to record whether we have
2779 already generated the necessary reloc. */
2784 bfd_put_32 (output_bfd
, relocation
,
2785 htab
->sgot
->contents
+ off
);
2790 Elf_Internal_Rela outrel
;
2797 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2798 + htab
->sgot
->output_offset
2800 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2802 loc
+= s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2803 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2806 local_got_offsets
[r_symndx
] |= 1;
2810 if (off
>= (bfd_vma
) -2)
2813 relocation
= htab
->sgot
->output_section
->vma
2814 + htab
->sgot
->output_offset
+ off
2815 - htab
->sgotplt
->output_section
->vma
2816 - htab
->sgotplt
->output_offset
;
2820 /* Relocation is relative to the start of the global offset
2823 /* Check to make sure it isn't a protected function symbol
2824 for shared library since it may not be local when used
2825 as function address. We also need to make sure that a
2826 symbol is defined locally. */
2827 if (info
->shared
&& h
)
2829 if (!h
->def_regular
)
2833 switch (ELF_ST_VISIBILITY (h
->other
))
2836 v
= _("hidden symbol");
2839 v
= _("internal symbol");
2842 v
= _("protected symbol");
2849 (*_bfd_error_handler
)
2850 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
2851 input_bfd
, v
, h
->root
.root
.string
);
2852 bfd_set_error (bfd_error_bad_value
);
2855 else if (!info
->executable
2856 && h
->type
== STT_FUNC
2857 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2859 (*_bfd_error_handler
)
2860 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2861 input_bfd
, h
->root
.root
.string
);
2862 bfd_set_error (bfd_error_bad_value
);
2867 /* Note that sgot is not involved in this
2868 calculation. We always want the start of .got.plt. If we
2869 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2870 permitted by the ABI, we might have to change this
2872 relocation
-= htab
->sgotplt
->output_section
->vma
2873 + htab
->sgotplt
->output_offset
;
2877 /* Use global offset table as symbol value. */
2878 relocation
= htab
->sgotplt
->output_section
->vma
2879 + htab
->sgotplt
->output_offset
;
2880 unresolved_reloc
= FALSE
;
2884 /* Relocation is to the entry for this symbol in the
2885 procedure linkage table. */
2887 /* Resolve a PLT32 reloc against a local symbol directly,
2888 without using the procedure linkage table. */
2892 if (h
->plt
.offset
== (bfd_vma
) -1
2893 || htab
->splt
== NULL
)
2895 /* We didn't make a PLT entry for this symbol. This
2896 happens when statically linking PIC code, or when
2897 using -Bsymbolic. */
2901 relocation
= (htab
->splt
->output_section
->vma
2902 + htab
->splt
->output_offset
2904 unresolved_reloc
= FALSE
;
2909 if ((input_section
->flags
& SEC_ALLOC
) == 0
2915 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2916 || h
->root
.type
!= bfd_link_hash_undefweak
)
2917 && (r_type
!= R_386_PC32
2918 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2922 && ! h
->forced_local
2923 && ((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
!= NULL
2924 && is_indirect_symbol (output_bfd
, h
))
2925 || (ELIMINATE_COPY_RELOCS
2932 || h
->root
.type
== bfd_link_hash_undefweak
2933 || h
->root
.type
== bfd_link_hash_undefined
)))
2935 Elf_Internal_Rela outrel
;
2937 bfd_boolean skip
, relocate
;
2940 /* When generating a shared object, these relocations
2941 are copied into the output file to be resolved at run
2948 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2950 if (outrel
.r_offset
== (bfd_vma
) -1)
2952 else if (outrel
.r_offset
== (bfd_vma
) -2)
2953 skip
= TRUE
, relocate
= TRUE
;
2954 outrel
.r_offset
+= (input_section
->output_section
->vma
2955 + input_section
->output_offset
);
2958 memset (&outrel
, 0, sizeof outrel
);
2961 && (r_type
== R_386_PC32
2963 || !SYMBOLIC_BIND (info
, h
)
2964 || !h
->def_regular
))
2965 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2968 /* This symbol is local, or marked to become local. */
2970 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2976 && ! h
->forced_local
2977 && is_indirect_symbol (output_bfd
, h
)
2978 && elf_section_data (input_section
)->indirect_relocs
!= NULL
2979 && elf_section_data (input_section
)->indirect_relocs
->contents
!= NULL
)
2980 sreloc
= elf_section_data (input_section
)->indirect_relocs
;
2982 sreloc
= elf_section_data (input_section
)->sreloc
;
2984 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
2986 loc
= sreloc
->contents
;
2987 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2989 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2991 /* If this reloc is against an external symbol, we do
2992 not want to fiddle with the addend. Otherwise, we
2993 need to include the symbol value so that it becomes
2994 an addend for the dynamic reloc. */
3003 Elf_Internal_Rela outrel
;
3007 outrel
.r_offset
= rel
->r_offset
3008 + input_section
->output_section
->vma
3009 + input_section
->output_offset
;
3010 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3011 sreloc
= elf_section_data (input_section
)->sreloc
;
3014 loc
= sreloc
->contents
;
3015 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3016 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3021 case R_386_TLS_GOTDESC
:
3022 case R_386_TLS_DESC_CALL
:
3023 case R_386_TLS_IE_32
:
3024 case R_386_TLS_GOTIE
:
3025 tls_type
= GOT_UNKNOWN
;
3026 if (h
== NULL
&& local_got_offsets
)
3027 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
3029 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
3030 if (tls_type
== GOT_TLS_IE
)
3031 tls_type
= GOT_TLS_IE_NEG
;
3033 if (! elf_i386_tls_transition (info
, input_bfd
,
3034 input_section
, contents
,
3035 symtab_hdr
, sym_hashes
,
3036 &r_type
, tls_type
, rel
,
3040 if (r_type
== R_386_TLS_LE_32
)
3042 BFD_ASSERT (! unresolved_reloc
);
3043 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
3048 /* GD->LE transition. */
3049 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3052 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3054 movl %gs:0, %eax; subl $foo@tpoff, %eax
3055 (6 byte form of subl). */
3056 memcpy (contents
+ rel
->r_offset
- 3,
3057 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3058 roff
= rel
->r_offset
+ 5;
3062 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3064 movl %gs:0, %eax; subl $foo@tpoff, %eax
3065 (6 byte form of subl). */
3066 memcpy (contents
+ rel
->r_offset
- 2,
3067 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3068 roff
= rel
->r_offset
+ 6;
3070 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
3072 /* Skip R_386_PC32/R_386_PLT32. */
3076 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
3078 /* GDesc -> LE transition.
3079 It's originally something like:
3080 leal x@tlsdesc(%ebx), %eax
3084 Registers other than %eax may be set up here. */
3089 roff
= rel
->r_offset
;
3090 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3092 /* Now modify the instruction as appropriate. */
3093 /* aoliva FIXME: remove the above and xor the byte
3095 bfd_put_8 (output_bfd
, val
^ 0x86,
3096 contents
+ roff
- 1);
3097 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
3101 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
3103 /* GDesc -> LE transition.
3111 roff
= rel
->r_offset
;
3112 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3113 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3116 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
3120 /* IE->LE transition:
3121 Originally it can be one of:
3129 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3132 /* movl foo, %eax. */
3133 bfd_put_8 (output_bfd
, 0xb8,
3134 contents
+ rel
->r_offset
- 1);
3140 type
= bfd_get_8 (input_bfd
,
3141 contents
+ rel
->r_offset
- 2);
3146 bfd_put_8 (output_bfd
, 0xc7,
3147 contents
+ rel
->r_offset
- 2);
3148 bfd_put_8 (output_bfd
,
3149 0xc0 | ((val
>> 3) & 7),
3150 contents
+ rel
->r_offset
- 1);
3154 bfd_put_8 (output_bfd
, 0x81,
3155 contents
+ rel
->r_offset
- 2);
3156 bfd_put_8 (output_bfd
,
3157 0xc0 | ((val
>> 3) & 7),
3158 contents
+ rel
->r_offset
- 1);
3165 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
3166 contents
+ rel
->r_offset
);
3171 unsigned int val
, type
;
3173 /* {IE_32,GOTIE}->LE transition:
3174 Originally it can be one of:
3175 subl foo(%reg1), %reg2
3176 movl foo(%reg1), %reg2
3177 addl foo(%reg1), %reg2
3180 movl $foo, %reg2 (6 byte form)
3181 addl $foo, %reg2. */
3182 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3183 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3187 bfd_put_8 (output_bfd
, 0xc7,
3188 contents
+ rel
->r_offset
- 2);
3189 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3190 contents
+ rel
->r_offset
- 1);
3192 else if (type
== 0x2b)
3195 bfd_put_8 (output_bfd
, 0x81,
3196 contents
+ rel
->r_offset
- 2);
3197 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
3198 contents
+ rel
->r_offset
- 1);
3200 else if (type
== 0x03)
3203 bfd_put_8 (output_bfd
, 0x81,
3204 contents
+ rel
->r_offset
- 2);
3205 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3206 contents
+ rel
->r_offset
- 1);
3210 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
3211 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
3212 contents
+ rel
->r_offset
);
3214 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
3215 contents
+ rel
->r_offset
);
3220 if (htab
->sgot
== NULL
)
3225 off
= h
->got
.offset
;
3226 offplt
= elf_i386_hash_entry (h
)->tlsdesc_got
;
3230 if (local_got_offsets
== NULL
)
3233 off
= local_got_offsets
[r_symndx
];
3234 offplt
= local_tlsdesc_gotents
[r_symndx
];
3241 Elf_Internal_Rela outrel
;
3246 if (htab
->srelgot
== NULL
)
3249 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3251 if (GOT_TLS_GDESC_P (tls_type
))
3253 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
3254 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
3255 <= htab
->sgotplt
->size
);
3256 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3257 + htab
->sgotplt
->output_offset
3259 + htab
->sgotplt_jump_table_size
);
3260 sreloc
= htab
->srelplt
;
3261 loc
= sreloc
->contents
;
3262 loc
+= (htab
->next_tls_desc_index
++
3263 * sizeof (Elf32_External_Rel
));
3264 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3265 <= sreloc
->contents
+ sreloc
->size
);
3266 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3269 BFD_ASSERT (! unresolved_reloc
);
3270 bfd_put_32 (output_bfd
,
3271 relocation
- dtpoff_base (info
),
3272 htab
->sgotplt
->contents
+ offplt
3273 + htab
->sgotplt_jump_table_size
+ 4);
3277 bfd_put_32 (output_bfd
, 0,
3278 htab
->sgotplt
->contents
+ offplt
3279 + htab
->sgotplt_jump_table_size
+ 4);
3283 sreloc
= htab
->srelgot
;
3285 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3286 + htab
->sgot
->output_offset
+ off
);
3288 if (GOT_TLS_GD_P (tls_type
))
3289 dr_type
= R_386_TLS_DTPMOD32
;
3290 else if (GOT_TLS_GDESC_P (tls_type
))
3292 else if (tls_type
== GOT_TLS_IE_POS
)
3293 dr_type
= R_386_TLS_TPOFF
;
3295 dr_type
= R_386_TLS_TPOFF32
;
3297 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
3298 bfd_put_32 (output_bfd
, relocation
- dtpoff_base (info
),
3299 htab
->sgot
->contents
+ off
);
3300 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
3301 bfd_put_32 (output_bfd
, dtpoff_base (info
) - relocation
,
3302 htab
->sgot
->contents
+ off
);
3303 else if (dr_type
!= R_386_TLS_DESC
)
3304 bfd_put_32 (output_bfd
, 0,
3305 htab
->sgot
->contents
+ off
);
3306 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
3308 loc
= sreloc
->contents
;
3309 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3310 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3311 <= sreloc
->contents
+ sreloc
->size
);
3312 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3314 if (GOT_TLS_GD_P (tls_type
))
3318 BFD_ASSERT (! unresolved_reloc
);
3319 bfd_put_32 (output_bfd
,
3320 relocation
- dtpoff_base (info
),
3321 htab
->sgot
->contents
+ off
+ 4);
3325 bfd_put_32 (output_bfd
, 0,
3326 htab
->sgot
->contents
+ off
+ 4);
3327 outrel
.r_info
= ELF32_R_INFO (indx
,
3328 R_386_TLS_DTPOFF32
);
3329 outrel
.r_offset
+= 4;
3330 sreloc
->reloc_count
++;
3331 loc
+= sizeof (Elf32_External_Rel
);
3332 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3333 <= sreloc
->contents
+ sreloc
->size
);
3334 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3337 else if (tls_type
== GOT_TLS_IE_BOTH
)
3339 bfd_put_32 (output_bfd
,
3340 indx
== 0 ? relocation
- dtpoff_base (info
) : 0,
3341 htab
->sgot
->contents
+ off
+ 4);
3342 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3343 outrel
.r_offset
+= 4;
3344 sreloc
->reloc_count
++;
3345 loc
+= sizeof (Elf32_External_Rel
);
3346 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3353 local_got_offsets
[r_symndx
] |= 1;
3356 if (off
>= (bfd_vma
) -2
3357 && ! GOT_TLS_GDESC_P (tls_type
))
3359 if (r_type
== R_386_TLS_GOTDESC
3360 || r_type
== R_386_TLS_DESC_CALL
)
3362 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
3363 unresolved_reloc
= FALSE
;
3365 else if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3367 bfd_vma g_o_t
= htab
->sgotplt
->output_section
->vma
3368 + htab
->sgotplt
->output_offset
;
3369 relocation
= htab
->sgot
->output_section
->vma
3370 + htab
->sgot
->output_offset
+ off
- g_o_t
;
3371 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
3372 && tls_type
== GOT_TLS_IE_BOTH
)
3374 if (r_type
== R_386_TLS_IE
)
3375 relocation
+= g_o_t
;
3376 unresolved_reloc
= FALSE
;
3378 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
3380 unsigned int val
, type
;
3383 /* GD->IE transition. */
3384 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3385 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3388 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3390 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3392 roff
= rel
->r_offset
- 3;
3396 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3398 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3399 roff
= rel
->r_offset
- 2;
3401 memcpy (contents
+ roff
,
3402 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3403 contents
[roff
+ 7] = 0x80 | (val
& 7);
3404 /* If foo is used only with foo@gotntpoff(%reg) and
3405 foo@indntpoff, but not with foo@gottpoff(%reg), change
3406 subl $foo@gottpoff(%reg), %eax
3408 addl $foo@gotntpoff(%reg), %eax. */
3409 if (tls_type
== GOT_TLS_IE_POS
)
3410 contents
[roff
+ 6] = 0x03;
3411 bfd_put_32 (output_bfd
,
3412 htab
->sgot
->output_section
->vma
3413 + htab
->sgot
->output_offset
+ off
3414 - htab
->sgotplt
->output_section
->vma
3415 - htab
->sgotplt
->output_offset
,
3416 contents
+ roff
+ 8);
3417 /* Skip R_386_PLT32. */
3421 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
3423 /* GDesc -> IE transition.
3424 It's originally something like:
3425 leal x@tlsdesc(%ebx), %eax
3428 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3430 movl x@gottpoff(%ebx), %eax # before negl %eax
3432 Registers other than %eax may be set up here. */
3436 /* First, make sure it's a leal adding ebx to a 32-bit
3437 offset into any register, although it's probably
3438 almost always going to be eax. */
3439 roff
= rel
->r_offset
;
3441 /* Now modify the instruction as appropriate. */
3442 /* To turn a leal into a movl in the form we use it, it
3443 suffices to change the first byte from 0x8d to 0x8b.
3444 aoliva FIXME: should we decide to keep the leal, all
3445 we have to do is remove the statement below, and
3446 adjust the relaxation of R_386_TLS_DESC_CALL. */
3447 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3449 if (tls_type
== GOT_TLS_IE_BOTH
)
3452 bfd_put_32 (output_bfd
,
3453 htab
->sgot
->output_section
->vma
3454 + htab
->sgot
->output_offset
+ off
3455 - htab
->sgotplt
->output_section
->vma
3456 - htab
->sgotplt
->output_offset
,
3460 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
3462 /* GDesc -> IE transition.
3470 depending on how we transformed the TLS_GOTDESC above.
3475 roff
= rel
->r_offset
;
3477 /* Now modify the instruction as appropriate. */
3478 if (tls_type
!= GOT_TLS_IE_NEG
)
3481 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3482 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3487 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
3488 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
3498 if (! elf_i386_tls_transition (info
, input_bfd
,
3499 input_section
, contents
,
3500 symtab_hdr
, sym_hashes
,
3501 &r_type
, GOT_UNKNOWN
, rel
,
3505 if (r_type
!= R_386_TLS_LDM
)
3507 /* LD->LE transition:
3508 leal foo(%reg), %eax; call ___tls_get_addr.
3510 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3511 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
3512 memcpy (contents
+ rel
->r_offset
- 2,
3513 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3514 /* Skip R_386_PC32/R_386_PLT32. */
3519 if (htab
->sgot
== NULL
)
3522 off
= htab
->tls_ldm_got
.offset
;
3527 Elf_Internal_Rela outrel
;
3530 if (htab
->srelgot
== NULL
)
3533 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3534 + htab
->sgot
->output_offset
+ off
);
3536 bfd_put_32 (output_bfd
, 0,
3537 htab
->sgot
->contents
+ off
);
3538 bfd_put_32 (output_bfd
, 0,
3539 htab
->sgot
->contents
+ off
+ 4);
3540 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
3541 loc
= htab
->srelgot
->contents
;
3542 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3543 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3544 htab
->tls_ldm_got
.offset
|= 1;
3546 relocation
= htab
->sgot
->output_section
->vma
3547 + htab
->sgot
->output_offset
+ off
3548 - htab
->sgotplt
->output_section
->vma
3549 - htab
->sgotplt
->output_offset
;
3550 unresolved_reloc
= FALSE
;
3553 case R_386_TLS_LDO_32
:
3554 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3555 relocation
-= dtpoff_base (info
);
3557 /* When converting LDO to LE, we must negate. */
3558 relocation
= -tpoff (info
, relocation
);
3561 case R_386_TLS_LE_32
:
3565 Elf_Internal_Rela outrel
;
3570 outrel
.r_offset
= rel
->r_offset
3571 + input_section
->output_section
->vma
3572 + input_section
->output_offset
;
3573 if (h
!= NULL
&& h
->dynindx
!= -1)
3577 if (r_type
== R_386_TLS_LE_32
)
3578 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
3580 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3581 sreloc
= elf_section_data (input_section
)->sreloc
;
3584 loc
= sreloc
->contents
;
3585 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3586 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3589 else if (r_type
== R_386_TLS_LE_32
)
3590 relocation
= dtpoff_base (info
) - relocation
;
3592 relocation
-= dtpoff_base (info
);
3594 else if (r_type
== R_386_TLS_LE_32
)
3595 relocation
= tpoff (info
, relocation
);
3597 relocation
= -tpoff (info
, relocation
);
3604 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3605 because such sections are not SEC_ALLOC and thus ld.so will
3606 not process them. */
3607 if (unresolved_reloc
3608 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3611 (*_bfd_error_handler
)
3612 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3615 (long) rel
->r_offset
,
3617 h
->root
.root
.string
);
3621 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3622 contents
, rel
->r_offset
,
3625 if (r
!= bfd_reloc_ok
)
3630 name
= h
->root
.root
.string
;
3633 name
= bfd_elf_string_from_elf_section (input_bfd
,
3634 symtab_hdr
->sh_link
,
3639 name
= bfd_section_name (input_bfd
, sec
);
3642 if (r
== bfd_reloc_overflow
)
3644 if (! ((*info
->callbacks
->reloc_overflow
)
3645 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3646 (bfd_vma
) 0, input_bfd
, input_section
,
3652 (*_bfd_error_handler
)
3653 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3654 input_bfd
, input_section
,
3655 (long) rel
->r_offset
, name
, (int) r
);
3664 /* Finish up dynamic symbol handling. We set the contents of various
3665 dynamic sections here. */
3668 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
3669 struct bfd_link_info
*info
,
3670 struct elf_link_hash_entry
*h
,
3671 Elf_Internal_Sym
*sym
)
3673 struct elf_i386_link_hash_table
*htab
;
3675 htab
= elf_i386_hash_table (info
);
3677 if (h
->plt
.offset
!= (bfd_vma
) -1)
3681 Elf_Internal_Rela rel
;
3684 /* This symbol has an entry in the procedure linkage table. Set
3687 if (h
->dynindx
== -1
3688 || htab
->splt
== NULL
3689 || htab
->sgotplt
== NULL
3690 || htab
->srelplt
== NULL
)
3693 /* Get the index in the procedure linkage table which
3694 corresponds to this symbol. This is the index of this symbol
3695 in all the symbols for which we are making plt entries. The
3696 first entry in the procedure linkage table is reserved. */
3697 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3699 /* Get the offset into the .got table of the entry that
3700 corresponds to this function. Each .got entry is 4 bytes.
3701 The first three are reserved. */
3702 got_offset
= (plt_index
+ 3) * 4;
3704 /* Fill in the entry in the procedure linkage table. */
3707 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_plt_entry
,
3709 bfd_put_32 (output_bfd
,
3710 (htab
->sgotplt
->output_section
->vma
3711 + htab
->sgotplt
->output_offset
3713 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3715 if (htab
->is_vxworks
)
3717 int s
, k
, reloc_index
;
3719 /* Create the R_386_32 relocation referencing the GOT
3720 for this PLT entry. */
3722 /* S: Current slot number (zero-based). */
3723 s
= (h
->plt
.offset
- PLT_ENTRY_SIZE
) / PLT_ENTRY_SIZE
;
3724 /* K: Number of relocations for PLTResolve. */
3726 k
= PLTRESOLVE_RELOCS_SHLIB
;
3728 k
= PLTRESOLVE_RELOCS
;
3729 /* Skip the PLTresolve relocations, and the relocations for
3730 the other PLT slots. */
3731 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
3732 loc
= (htab
->srelplt2
->contents
+ reloc_index
3733 * sizeof (Elf32_External_Rel
));
3735 rel
.r_offset
= (htab
->splt
->output_section
->vma
3736 + htab
->splt
->output_offset
3737 + h
->plt
.offset
+ 2),
3738 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
3739 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3741 /* Create the R_386_32 relocation referencing the beginning of
3742 the PLT for this GOT entry. */
3743 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3744 + htab
->sgotplt
->output_offset
3746 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
3747 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3748 loc
+ sizeof (Elf32_External_Rel
));
3753 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_pic_plt_entry
,
3755 bfd_put_32 (output_bfd
, got_offset
,
3756 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3759 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
3760 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3761 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3762 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3764 /* Fill in the entry in the global offset table. */
3765 bfd_put_32 (output_bfd
,
3766 (htab
->splt
->output_section
->vma
3767 + htab
->splt
->output_offset
3770 htab
->sgotplt
->contents
+ got_offset
);
3772 /* Fill in the entry in the .rel.plt section. */
3773 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3774 + htab
->sgotplt
->output_offset
3776 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
3777 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3778 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3780 if (!h
->def_regular
)
3782 /* Mark the symbol as undefined, rather than as defined in
3783 the .plt section. Leave the value if there were any
3784 relocations where pointer equality matters (this is a clue
3785 for the dynamic linker, to make function pointer
3786 comparisons work between an application and shared
3787 library), otherwise set it to zero. If a function is only
3788 called from a binary, there is no need to slow down
3789 shared libraries because of that. */
3790 sym
->st_shndx
= SHN_UNDEF
;
3791 if (!h
->pointer_equality_needed
)
3796 if (h
->got
.offset
!= (bfd_vma
) -1
3797 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h
)->tls_type
)
3798 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
3800 Elf_Internal_Rela rel
;
3803 /* This symbol has an entry in the global offset table. Set it
3806 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3809 rel
.r_offset
= (htab
->sgot
->output_section
->vma
3810 + htab
->sgot
->output_offset
3811 + (h
->got
.offset
& ~(bfd_vma
) 1));
3813 /* If this is a static link, or it is a -Bsymbolic link and the
3814 symbol is defined locally or was forced to be local because
3815 of a version file, we just want to emit a RELATIVE reloc.
3816 The entry in the global offset table will already have been
3817 initialized in the relocate_section function. */
3819 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3821 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3822 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3826 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3827 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
3828 htab
->sgot
->contents
+ h
->got
.offset
);
3829 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
3832 loc
= htab
->srelgot
->contents
;
3833 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3834 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3839 Elf_Internal_Rela rel
;
3842 /* This symbol needs a copy reloc. Set it up. */
3844 if (h
->dynindx
== -1
3845 || (h
->root
.type
!= bfd_link_hash_defined
3846 && h
->root
.type
!= bfd_link_hash_defweak
)
3847 || htab
->srelbss
== NULL
)
3850 rel
.r_offset
= (h
->root
.u
.def
.value
3851 + h
->root
.u
.def
.section
->output_section
->vma
3852 + h
->root
.u
.def
.section
->output_offset
);
3853 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
3854 loc
= htab
->srelbss
->contents
;
3855 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3856 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3859 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3860 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3861 is relative to the ".got" section. */
3862 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3863 || (!htab
->is_vxworks
&& h
== htab
->elf
.hgot
))
3864 sym
->st_shndx
= SHN_ABS
;
3869 /* Used to decide how to sort relocs in an optimal manner for the
3870 dynamic linker, before writing them out. */
3872 static enum elf_reloc_type_class
3873 elf_i386_reloc_type_class (const Elf_Internal_Rela
*rela
)
3875 switch (ELF32_R_TYPE (rela
->r_info
))
3877 case R_386_RELATIVE
:
3878 return reloc_class_relative
;
3879 case R_386_JUMP_SLOT
:
3880 return reloc_class_plt
;
3882 return reloc_class_copy
;
3884 return reloc_class_normal
;
3888 /* Finish up the dynamic sections. */
3891 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
3892 struct bfd_link_info
*info
)
3894 struct elf_i386_link_hash_table
*htab
;
3898 htab
= elf_i386_hash_table (info
);
3899 dynobj
= htab
->elf
.dynobj
;
3900 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3902 if (htab
->elf
.dynamic_sections_created
)
3904 Elf32_External_Dyn
*dyncon
, *dynconend
;
3906 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3909 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3910 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3911 for (; dyncon
< dynconend
; dyncon
++)
3913 Elf_Internal_Dyn dyn
;
3916 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3921 if (htab
->is_vxworks
3922 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
3928 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3933 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3938 dyn
.d_un
.d_val
= s
->size
;
3942 /* My reading of the SVR4 ABI indicates that the
3943 procedure linkage table relocs (DT_JMPREL) should be
3944 included in the overall relocs (DT_REL). This is
3945 what Solaris does. However, UnixWare can not handle
3946 that case. Therefore, we override the DT_RELSZ entry
3947 here to make it not include the JMPREL relocs. */
3951 dyn
.d_un
.d_val
-= s
->size
;
3955 /* We may not be using the standard ELF linker script.
3956 If .rel.plt is the first .rel section, we adjust
3957 DT_REL to not include it. */
3961 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
3963 dyn
.d_un
.d_ptr
+= s
->size
;
3967 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3970 /* Fill in the first entry in the procedure linkage table. */
3971 if (htab
->splt
&& htab
->splt
->size
> 0)
3975 memcpy (htab
->splt
->contents
, elf_i386_pic_plt0_entry
,
3976 sizeof (elf_i386_pic_plt0_entry
));
3977 memset (htab
->splt
->contents
+ sizeof (elf_i386_pic_plt0_entry
),
3978 htab
->plt0_pad_byte
,
3979 PLT_ENTRY_SIZE
- sizeof (elf_i386_pic_plt0_entry
));
3983 memcpy (htab
->splt
->contents
, elf_i386_plt0_entry
,
3984 sizeof(elf_i386_plt0_entry
));
3985 memset (htab
->splt
->contents
+ sizeof (elf_i386_plt0_entry
),
3986 htab
->plt0_pad_byte
,
3987 PLT_ENTRY_SIZE
- sizeof (elf_i386_plt0_entry
));
3988 bfd_put_32 (output_bfd
,
3989 (htab
->sgotplt
->output_section
->vma
3990 + htab
->sgotplt
->output_offset
3992 htab
->splt
->contents
+ 2);
3993 bfd_put_32 (output_bfd
,
3994 (htab
->sgotplt
->output_section
->vma
3995 + htab
->sgotplt
->output_offset
3997 htab
->splt
->contents
+ 8);
3999 if (htab
->is_vxworks
)
4001 Elf_Internal_Rela rel
;
4003 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4004 On IA32 we use REL relocations so the addend goes in
4005 the PLT directly. */
4006 rel
.r_offset
= (htab
->splt
->output_section
->vma
4007 + htab
->splt
->output_offset
4009 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4010 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4011 htab
->srelplt2
->contents
);
4012 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4013 rel
.r_offset
= (htab
->splt
->output_section
->vma
4014 + htab
->splt
->output_offset
4016 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4017 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4018 htab
->srelplt2
->contents
+
4019 sizeof (Elf32_External_Rel
));
4023 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4024 really seem like the right value. */
4025 elf_section_data (htab
->splt
->output_section
)
4026 ->this_hdr
.sh_entsize
= 4;
4028 /* Correct the .rel.plt.unloaded relocations. */
4029 if (htab
->is_vxworks
&& !info
->shared
)
4031 int num_plts
= (htab
->splt
->size
/ PLT_ENTRY_SIZE
) - 1;
4034 p
= htab
->srelplt2
->contents
;
4036 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
4038 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
4040 for (; num_plts
; num_plts
--)
4042 Elf_Internal_Rela rel
;
4043 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4044 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4045 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4046 p
+= sizeof (Elf32_External_Rel
);
4048 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4049 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
4050 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4051 p
+= sizeof (Elf32_External_Rel
);
4059 /* Fill in the first three entries in the global offset table. */
4060 if (htab
->sgotplt
->size
> 0)
4062 bfd_put_32 (output_bfd
,
4064 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
4065 htab
->sgotplt
->contents
);
4066 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 4);
4067 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 8);
4070 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
4073 if (htab
->sgot
&& htab
->sgot
->size
> 0)
4074 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4079 /* Return address for Ith PLT stub in section PLT, for relocation REL
4080 or (bfd_vma) -1 if it should not be included. */
4083 elf_i386_plt_sym_val (bfd_vma i
, const asection
*plt
,
4084 const arelent
*rel ATTRIBUTE_UNUSED
)
4086 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4089 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4092 elf_i386_hash_symbol (struct elf_link_hash_entry
*h
)
4094 if (h
->plt
.offset
!= (bfd_vma
) -1
4096 && !h
->pointer_equality_needed
)
4099 return _bfd_elf_hash_symbol (h
);
4102 /* Hook called by the linker routine which adds symbols from an object
4106 elf_i386_add_symbol_hook (bfd
* abfd ATTRIBUTE_UNUSED
,
4107 struct bfd_link_info
* info ATTRIBUTE_UNUSED
,
4108 Elf_Internal_Sym
* sym
,
4109 const char ** namep ATTRIBUTE_UNUSED
,
4110 flagword
* flagsp ATTRIBUTE_UNUSED
,
4111 asection
** secp ATTRIBUTE_UNUSED
,
4112 bfd_vma
* valp ATTRIBUTE_UNUSED
)
4114 if (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4115 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4120 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4121 #define TARGET_LITTLE_NAME "elf32-i386"
4122 #define ELF_ARCH bfd_arch_i386
4123 #define ELF_MACHINE_CODE EM_386
4124 #define ELF_MAXPAGESIZE 0x1000
4126 #define elf_backend_can_gc_sections 1
4127 #define elf_backend_can_refcount 1
4128 #define elf_backend_want_got_plt 1
4129 #define elf_backend_plt_readonly 1
4130 #define elf_backend_want_plt_sym 0
4131 #define elf_backend_got_header_size 12
4133 /* Support RELA for objdump of prelink objects. */
4134 #define elf_info_to_howto elf_i386_info_to_howto_rel
4135 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4137 #define bfd_elf32_mkobject elf_i386_mkobject
4139 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4140 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4141 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4142 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4144 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4145 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4146 #define elf_backend_check_relocs elf_i386_check_relocs
4147 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4148 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4149 #define elf_backend_fake_sections elf_i386_fake_sections
4150 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4151 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4152 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4153 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4154 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4155 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4156 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4157 #define elf_backend_relocate_section elf_i386_relocate_section
4158 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4159 #define elf_backend_always_size_sections elf_i386_always_size_sections
4160 #define elf_backend_omit_section_dynsym \
4161 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4162 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4163 #define elf_backend_hash_symbol elf_i386_hash_symbol
4164 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4165 #undef elf_backend_post_process_headers
4166 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4168 #include "elf32-target.h"
4170 /* FreeBSD support. */
4172 #undef TARGET_LITTLE_SYM
4173 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4174 #undef TARGET_LITTLE_NAME
4175 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4177 #define ELF_OSABI ELFOSABI_FREEBSD
4179 /* The kernel recognizes executables as valid only if they carry a
4180 "FreeBSD" label in the ELF header. So we put this label on all
4181 executables and (for simplicity) also all other object files. */
4184 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
4186 _bfd_elf_set_osabi (abfd
, info
);
4188 #ifdef OLD_FREEBSD_ABI_LABEL
4189 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4190 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
4194 #undef elf_backend_post_process_headers
4195 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4197 #define elf32_bed elf32_i386_fbsd_bed
4199 #undef elf_backend_add_symbol_hook
4201 #include "elf32-target.h"
4203 /* VxWorks support. */
4205 #undef TARGET_LITTLE_SYM
4206 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4207 #undef TARGET_LITTLE_NAME
4208 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4211 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4213 static struct bfd_link_hash_table
*
4214 elf_i386_vxworks_link_hash_table_create (bfd
*abfd
)
4216 struct bfd_link_hash_table
*ret
;
4217 struct elf_i386_link_hash_table
*htab
;
4219 ret
= elf_i386_link_hash_table_create (abfd
);
4222 htab
= (struct elf_i386_link_hash_table
*) ret
;
4223 htab
->is_vxworks
= 1;
4224 htab
->plt0_pad_byte
= 0x90;
4231 #undef elf_backend_relocs_compatible
4232 #undef elf_backend_post_process_headers
4233 #undef bfd_elf32_bfd_link_hash_table_create
4234 #define bfd_elf32_bfd_link_hash_table_create \
4235 elf_i386_vxworks_link_hash_table_create
4236 #undef elf_backend_add_symbol_hook
4237 #define elf_backend_add_symbol_hook \
4238 elf_vxworks_add_symbol_hook
4239 #undef elf_backend_link_output_symbol_hook
4240 #define elf_backend_link_output_symbol_hook \
4241 elf_vxworks_link_output_symbol_hook
4242 #undef elf_backend_emit_relocs
4243 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4244 #undef elf_backend_final_write_processing
4245 #define elf_backend_final_write_processing \
4246 elf_vxworks_final_write_processing
4248 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4250 #undef elf_backend_want_plt_sym
4251 #define elf_backend_want_plt_sym 1
4254 #define elf32_bed elf32_i386_vxworks_bed
4256 #include "elf32-target.h"