1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 static reloc_howto_type
*elf_i386_reloc_type_lookup
28 PARAMS ((bfd
*, bfd_reloc_code_real_type
));
29 static void elf_i386_info_to_howto_rel
30 PARAMS ((bfd
*, arelent
*, Elf_Internal_Rela
*));
31 static bfd_boolean elf_i386_is_local_label_name
32 PARAMS ((bfd
*, const char *));
33 static bfd_boolean elf_i386_grok_prstatus
34 PARAMS ((bfd
*abfd
, Elf_Internal_Note
*note
));
35 static bfd_boolean elf_i386_grok_psinfo
36 PARAMS ((bfd
*abfd
, Elf_Internal_Note
*note
));
37 static struct bfd_hash_entry
*link_hash_newfunc
38 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
39 static struct bfd_link_hash_table
*elf_i386_link_hash_table_create
41 static bfd_boolean create_got_section
42 PARAMS ((bfd
*, struct bfd_link_info
*));
43 static bfd_boolean elf_i386_create_dynamic_sections
44 PARAMS ((bfd
*, struct bfd_link_info
*));
45 static void elf_i386_copy_indirect_symbol
46 PARAMS ((struct elf_backend_data
*, struct elf_link_hash_entry
*,
47 struct elf_link_hash_entry
*));
48 static int elf_i386_tls_transition
49 PARAMS ((struct bfd_link_info
*, int, int));
51 static bfd_boolean elf_i386_mkobject
53 static bfd_boolean elf_i386_object_p
55 static bfd_boolean elf_i386_check_relocs
56 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
57 const Elf_Internal_Rela
*));
58 static asection
*elf_i386_gc_mark_hook
59 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
60 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
61 static bfd_boolean elf_i386_gc_sweep_hook
62 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
63 const Elf_Internal_Rela
*));
64 static bfd_boolean elf_i386_adjust_dynamic_symbol
65 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
66 static bfd_boolean allocate_dynrelocs
67 PARAMS ((struct elf_link_hash_entry
*, PTR
));
68 static bfd_boolean readonly_dynrelocs
69 PARAMS ((struct elf_link_hash_entry
*, PTR
));
70 static bfd_boolean elf_i386_fake_sections
71 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
72 static bfd_boolean elf_i386_size_dynamic_sections
73 PARAMS ((bfd
*, struct bfd_link_info
*));
74 static bfd_vma dtpoff_base
75 PARAMS ((struct bfd_link_info
*));
77 PARAMS ((struct bfd_link_info
*, bfd_vma
));
78 static bfd_boolean elf_i386_relocate_section
79 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
80 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
81 static bfd_boolean elf_i386_finish_dynamic_symbol
82 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
84 static enum elf_reloc_type_class elf_i386_reloc_type_class
85 PARAMS ((const Elf_Internal_Rela
*));
86 static bfd_boolean elf_i386_finish_dynamic_sections
87 PARAMS ((bfd
*, struct bfd_link_info
*));
89 #define USE_REL 1 /* 386 uses REL relocations instead of RELA. */
93 static reloc_howto_type elf_howto_table
[]=
95 HOWTO(R_386_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_386_NONE",
97 TRUE
, 0x00000000, 0x00000000, FALSE
),
98 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_386_32",
100 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
101 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_386_PC32",
103 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
104 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
105 bfd_elf_generic_reloc
, "R_386_GOT32",
106 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
107 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
108 bfd_elf_generic_reloc
, "R_386_PLT32",
109 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
110 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
111 bfd_elf_generic_reloc
, "R_386_COPY",
112 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
113 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
115 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
116 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
117 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
118 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
119 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
120 bfd_elf_generic_reloc
, "R_386_RELATIVE",
121 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
122 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
123 bfd_elf_generic_reloc
, "R_386_GOTOFF",
124 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
125 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_386_GOTPC",
127 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
129 /* We have a gap in the reloc numbers here.
130 R_386_standard counts the number up to this point, and
131 R_386_ext_offset is the value to subtract from a reloc type of
132 R_386_16 thru R_386_PC8 to form an index into this table. */
133 #define R_386_standard ((unsigned int) R_386_GOTPC + 1)
134 #define R_386_ext_offset ((unsigned int) R_386_TLS_TPOFF - R_386_standard)
136 /* These relocs are a GNU extension. */
137 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
138 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
139 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
140 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
141 bfd_elf_generic_reloc
, "R_386_TLS_IE",
142 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
143 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
144 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
145 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
146 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
147 bfd_elf_generic_reloc
, "R_386_TLS_LE",
148 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
149 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
150 bfd_elf_generic_reloc
, "R_386_TLS_GD",
151 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
152 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
153 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
154 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
155 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
156 bfd_elf_generic_reloc
, "R_386_16",
157 TRUE
, 0xffff, 0xffff, FALSE
),
158 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
159 bfd_elf_generic_reloc
, "R_386_PC16",
160 TRUE
, 0xffff, 0xffff, TRUE
),
161 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
162 bfd_elf_generic_reloc
, "R_386_8",
163 TRUE
, 0xff, 0xff, FALSE
),
164 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
165 bfd_elf_generic_reloc
, "R_386_PC8",
166 TRUE
, 0xff, 0xff, TRUE
),
168 #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset)
169 #define R_386_tls_offset ((unsigned int) R_386_TLS_LDO_32 - R_386_ext)
170 /* These are common with Solaris TLS implementation. */
171 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
172 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
173 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
174 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
175 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
176 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
177 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
178 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
179 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
180 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
181 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
182 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
183 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
184 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
185 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
186 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
187 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
188 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
191 #define R_386_tls ((unsigned int) R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
192 #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_tls)
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_386_GNU_VTINHERIT
, /* type */
197 2, /* size (0 = byte, 1 = short, 2 = long) */
199 FALSE
, /* pc_relative */
201 complain_overflow_dont
, /* complain_on_overflow */
202 NULL
, /* special_function */
203 "R_386_GNU_VTINHERIT", /* name */
204 FALSE
, /* partial_inplace */
207 FALSE
), /* pcrel_offset */
209 /* GNU extension to record C++ vtable member usage. */
210 HOWTO (R_386_GNU_VTENTRY
, /* type */
212 2, /* size (0 = byte, 1 = short, 2 = long) */
214 FALSE
, /* pc_relative */
216 complain_overflow_dont
, /* complain_on_overflow */
217 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
218 "R_386_GNU_VTENTRY", /* name */
219 FALSE
, /* partial_inplace */
222 FALSE
) /* pcrel_offset */
224 #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
228 #ifdef DEBUG_GEN_RELOC
229 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
234 static reloc_howto_type
*
235 elf_i386_reloc_type_lookup (abfd
, code
)
236 bfd
*abfd ATTRIBUTE_UNUSED
;
237 bfd_reloc_code_real_type code
;
242 TRACE ("BFD_RELOC_NONE");
243 return &elf_howto_table
[(unsigned int) R_386_NONE
];
246 TRACE ("BFD_RELOC_32");
247 return &elf_howto_table
[(unsigned int) R_386_32
];
250 TRACE ("BFD_RELOC_CTOR");
251 return &elf_howto_table
[(unsigned int) R_386_32
];
253 case BFD_RELOC_32_PCREL
:
254 TRACE ("BFD_RELOC_PC32");
255 return &elf_howto_table
[(unsigned int) R_386_PC32
];
257 case BFD_RELOC_386_GOT32
:
258 TRACE ("BFD_RELOC_386_GOT32");
259 return &elf_howto_table
[(unsigned int) R_386_GOT32
];
261 case BFD_RELOC_386_PLT32
:
262 TRACE ("BFD_RELOC_386_PLT32");
263 return &elf_howto_table
[(unsigned int) R_386_PLT32
];
265 case BFD_RELOC_386_COPY
:
266 TRACE ("BFD_RELOC_386_COPY");
267 return &elf_howto_table
[(unsigned int) R_386_COPY
];
269 case BFD_RELOC_386_GLOB_DAT
:
270 TRACE ("BFD_RELOC_386_GLOB_DAT");
271 return &elf_howto_table
[(unsigned int) R_386_GLOB_DAT
];
273 case BFD_RELOC_386_JUMP_SLOT
:
274 TRACE ("BFD_RELOC_386_JUMP_SLOT");
275 return &elf_howto_table
[(unsigned int) R_386_JUMP_SLOT
];
277 case BFD_RELOC_386_RELATIVE
:
278 TRACE ("BFD_RELOC_386_RELATIVE");
279 return &elf_howto_table
[(unsigned int) R_386_RELATIVE
];
281 case BFD_RELOC_386_GOTOFF
:
282 TRACE ("BFD_RELOC_386_GOTOFF");
283 return &elf_howto_table
[(unsigned int) R_386_GOTOFF
];
285 case BFD_RELOC_386_GOTPC
:
286 TRACE ("BFD_RELOC_386_GOTPC");
287 return &elf_howto_table
[(unsigned int) R_386_GOTPC
];
289 /* These relocs are a GNU extension. */
290 case BFD_RELOC_386_TLS_TPOFF
:
291 TRACE ("BFD_RELOC_386_TLS_TPOFF");
292 return &elf_howto_table
[(unsigned int) R_386_TLS_TPOFF
- R_386_ext_offset
];
294 case BFD_RELOC_386_TLS_IE
:
295 TRACE ("BFD_RELOC_386_TLS_IE");
296 return &elf_howto_table
[(unsigned int) R_386_TLS_IE
- R_386_ext_offset
];
298 case BFD_RELOC_386_TLS_GOTIE
:
299 TRACE ("BFD_RELOC_386_TLS_GOTIE");
300 return &elf_howto_table
[(unsigned int) R_386_TLS_GOTIE
- R_386_ext_offset
];
302 case BFD_RELOC_386_TLS_LE
:
303 TRACE ("BFD_RELOC_386_TLS_LE");
304 return &elf_howto_table
[(unsigned int) R_386_TLS_LE
- R_386_ext_offset
];
306 case BFD_RELOC_386_TLS_GD
:
307 TRACE ("BFD_RELOC_386_TLS_GD");
308 return &elf_howto_table
[(unsigned int) R_386_TLS_GD
- R_386_ext_offset
];
310 case BFD_RELOC_386_TLS_LDM
:
311 TRACE ("BFD_RELOC_386_TLS_LDM");
312 return &elf_howto_table
[(unsigned int) R_386_TLS_LDM
- R_386_ext_offset
];
315 TRACE ("BFD_RELOC_16");
316 return &elf_howto_table
[(unsigned int) R_386_16
- R_386_ext_offset
];
318 case BFD_RELOC_16_PCREL
:
319 TRACE ("BFD_RELOC_16_PCREL");
320 return &elf_howto_table
[(unsigned int) R_386_PC16
- R_386_ext_offset
];
323 TRACE ("BFD_RELOC_8");
324 return &elf_howto_table
[(unsigned int) R_386_8
- R_386_ext_offset
];
326 case BFD_RELOC_8_PCREL
:
327 TRACE ("BFD_RELOC_8_PCREL");
328 return &elf_howto_table
[(unsigned int) R_386_PC8
- R_386_ext_offset
];
330 /* Common with Sun TLS implementation. */
331 case BFD_RELOC_386_TLS_LDO_32
:
332 TRACE ("BFD_RELOC_386_TLS_LDO_32");
333 return &elf_howto_table
[(unsigned int) R_386_TLS_LDO_32
- R_386_tls_offset
];
335 case BFD_RELOC_386_TLS_IE_32
:
336 TRACE ("BFD_RELOC_386_TLS_IE_32");
337 return &elf_howto_table
[(unsigned int) R_386_TLS_IE_32
- R_386_tls_offset
];
339 case BFD_RELOC_386_TLS_LE_32
:
340 TRACE ("BFD_RELOC_386_TLS_LE_32");
341 return &elf_howto_table
[(unsigned int) R_386_TLS_LE_32
- R_386_tls_offset
];
343 case BFD_RELOC_386_TLS_DTPMOD32
:
344 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
345 return &elf_howto_table
[(unsigned int) R_386_TLS_DTPMOD32
- R_386_tls_offset
];
347 case BFD_RELOC_386_TLS_DTPOFF32
:
348 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
349 return &elf_howto_table
[(unsigned int) R_386_TLS_DTPOFF32
- R_386_tls_offset
];
351 case BFD_RELOC_386_TLS_TPOFF32
:
352 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
353 return &elf_howto_table
[(unsigned int) R_386_TLS_TPOFF32
- R_386_tls_offset
];
355 case BFD_RELOC_VTABLE_INHERIT
:
356 TRACE ("BFD_RELOC_VTABLE_INHERIT");
357 return &elf_howto_table
[(unsigned int) R_386_GNU_VTINHERIT
360 case BFD_RELOC_VTABLE_ENTRY
:
361 TRACE ("BFD_RELOC_VTABLE_ENTRY");
362 return &elf_howto_table
[(unsigned int) R_386_GNU_VTENTRY
374 elf_i386_info_to_howto_rel (abfd
, cache_ptr
, dst
)
375 bfd
*abfd ATTRIBUTE_UNUSED
;
377 Elf_Internal_Rela
*dst
;
379 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
382 if ((indx
= r_type
) >= R_386_standard
383 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
384 >= R_386_ext
- R_386_standard
)
385 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
386 >= R_386_tls
- R_386_ext
)
387 && ((indx
= r_type
- R_386_vt_offset
) - R_386_tls
388 >= R_386_vt
- R_386_tls
))
390 (*_bfd_error_handler
) (_("%s: invalid relocation type %d"),
391 bfd_archive_filename (abfd
), (int) r_type
);
392 indx
= (unsigned int) R_386_NONE
;
394 cache_ptr
->howto
= &elf_howto_table
[indx
];
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
404 elf_i386_is_local_label_name (abfd
, name
)
408 if (name
[0] == '.' && name
[1] == 'X')
411 return _bfd_elf_is_local_label_name (abfd
, name
);
414 /* Support for core dump NOTE sections. */
416 elf_i386_grok_prstatus (abfd
, note
)
418 Elf_Internal_Note
*note
;
423 switch (note
->descsz
)
428 case 144: /* Linux/i386 */
430 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
433 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
442 /* Make a ".reg/999" section. */
443 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
444 raw_size
, note
->descpos
+ offset
);
448 elf_i386_grok_psinfo (abfd
, note
)
450 Elf_Internal_Note
*note
;
452 switch (note
->descsz
)
457 case 124: /* Linux/i386 elf_prpsinfo */
458 elf_tdata (abfd
)->core_program
459 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
460 elf_tdata (abfd
)->core_command
461 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
464 /* Note that for some reason, a spurious space is tacked
465 onto the end of the args in some (at least one anyway)
466 implementations, so strip it off if it exists. */
469 char *command
= elf_tdata (abfd
)->core_command
;
470 int n
= strlen (command
);
472 if (0 < n
&& command
[n
- 1] == ' ')
473 command
[n
- 1] = '\0';
479 /* Functions for the i386 ELF linker.
481 In order to gain some understanding of code in this file without
482 knowing all the intricate details of the linker, note the
485 Functions named elf_i386_* are called by external routines, other
486 functions are only called locally. elf_i386_* functions appear
487 in this file more or less in the order in which they are called
488 from external routines. eg. elf_i386_check_relocs is called
489 early in the link process, elf_i386_finish_dynamic_sections is
490 one of the last functions. */
493 /* The name of the dynamic interpreter. This is put in the .interp
496 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
498 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
499 copying dynamic variables from a shared lib into an app's dynbss
500 section, and instead use a dynamic relocation to point into the
502 #define ELIMINATE_COPY_RELOCS 1
504 /* The size in bytes of an entry in the procedure linkage table. */
506 #define PLT_ENTRY_SIZE 16
508 /* The first entry in an absolute procedure linkage table looks like
509 this. See the SVR4 ABI i386 supplement to see how this works. */
511 static const bfd_byte elf_i386_plt0_entry
[PLT_ENTRY_SIZE
] =
513 0xff, 0x35, /* pushl contents of address */
514 0, 0, 0, 0, /* replaced with address of .got + 4. */
515 0xff, 0x25, /* jmp indirect */
516 0, 0, 0, 0, /* replaced with address of .got + 8. */
517 0, 0, 0, 0 /* pad out to 16 bytes. */
520 /* Subsequent entries in an absolute procedure linkage table look like
523 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
525 0xff, 0x25, /* jmp indirect */
526 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
527 0x68, /* pushl immediate */
528 0, 0, 0, 0, /* replaced with offset into relocation table. */
529 0xe9, /* jmp relative */
530 0, 0, 0, 0 /* replaced with offset to start of .plt. */
533 /* The first entry in a PIC procedure linkage table look like this. */
535 static const bfd_byte elf_i386_pic_plt0_entry
[PLT_ENTRY_SIZE
] =
537 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
538 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
539 0, 0, 0, 0 /* pad out to 16 bytes. */
542 /* Subsequent entries in a PIC procedure linkage table look like this. */
544 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
546 0xff, 0xa3, /* jmp *offset(%ebx) */
547 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
548 0x68, /* pushl immediate */
549 0, 0, 0, 0, /* replaced with offset into relocation table. */
550 0xe9, /* jmp relative */
551 0, 0, 0, 0 /* replaced with offset to start of .plt. */
554 /* The i386 linker needs to keep track of the number of relocs that it
555 decides to copy as dynamic relocs in check_relocs for each symbol.
556 This is so that it can later discard them if they are found to be
557 unnecessary. We store the information in a field extending the
558 regular ELF linker hash table. */
560 struct elf_i386_dyn_relocs
562 struct elf_i386_dyn_relocs
*next
;
564 /* The input section of the reloc. */
567 /* Total number of relocs copied for the input section. */
570 /* Number of pc-relative relocs copied for the input section. */
571 bfd_size_type pc_count
;
574 /* i386 ELF linker hash entry. */
576 struct elf_i386_link_hash_entry
578 struct elf_link_hash_entry elf
;
580 /* Track dynamic relocs copied for this symbol. */
581 struct elf_i386_dyn_relocs
*dyn_relocs
;
583 #define GOT_UNKNOWN 0
587 #define GOT_TLS_IE_POS 5
588 #define GOT_TLS_IE_NEG 6
589 #define GOT_TLS_IE_BOTH 7
590 unsigned char tls_type
;
593 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
595 struct elf_i386_obj_tdata
597 struct elf_obj_tdata root
;
599 /* tls_type for each local got entry. */
600 char *local_got_tls_type
;
603 #define elf_i386_tdata(abfd) \
604 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
606 #define elf_i386_local_got_tls_type(abfd) \
607 (elf_i386_tdata (abfd)->local_got_tls_type)
610 elf_i386_mkobject (abfd
)
613 bfd_size_type amt
= sizeof (struct elf_i386_obj_tdata
);
614 abfd
->tdata
.any
= bfd_zalloc (abfd
, amt
);
615 if (abfd
->tdata
.any
== NULL
)
621 elf_i386_object_p (abfd
)
624 /* Allocate our special target data. */
625 struct elf_i386_obj_tdata
*new_tdata
;
626 bfd_size_type amt
= sizeof (struct elf_i386_obj_tdata
);
627 new_tdata
= bfd_zalloc (abfd
, amt
);
628 if (new_tdata
== NULL
)
630 new_tdata
->root
= *abfd
->tdata
.elf_obj_data
;
631 abfd
->tdata
.any
= new_tdata
;
635 /* i386 ELF linker hash table. */
637 struct elf_i386_link_hash_table
639 struct elf_link_hash_table elf
;
641 /* Short-cuts to get to dynamic linker sections. */
651 bfd_signed_vma refcount
;
655 /* Small local sym to section mapping cache. */
656 struct sym_sec_cache sym_sec
;
659 /* Get the i386 ELF linker hash table from a link_info structure. */
661 #define elf_i386_hash_table(p) \
662 ((struct elf_i386_link_hash_table *) ((p)->hash))
664 /* Create an entry in an i386 ELF linker hash table. */
666 static struct bfd_hash_entry
*
667 link_hash_newfunc (entry
, table
, string
)
668 struct bfd_hash_entry
*entry
;
669 struct bfd_hash_table
*table
;
672 /* Allocate the structure if it has not already been allocated by a
676 entry
= bfd_hash_allocate (table
,
677 sizeof (struct elf_i386_link_hash_entry
));
682 /* Call the allocation method of the superclass. */
683 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
686 struct elf_i386_link_hash_entry
*eh
;
688 eh
= (struct elf_i386_link_hash_entry
*) entry
;
689 eh
->dyn_relocs
= NULL
;
690 eh
->tls_type
= GOT_UNKNOWN
;
696 /* Create an i386 ELF linker hash table. */
698 static struct bfd_link_hash_table
*
699 elf_i386_link_hash_table_create (abfd
)
702 struct elf_i386_link_hash_table
*ret
;
703 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
705 ret
= (struct elf_i386_link_hash_table
*) bfd_malloc (amt
);
709 if (! _bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
))
722 ret
->tls_ldm_got
.refcount
= 0;
723 ret
->sym_sec
.abfd
= NULL
;
725 return &ret
->elf
.root
;
728 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
729 shortcuts to them in our hash table. */
732 create_got_section (dynobj
, info
)
734 struct bfd_link_info
*info
;
736 struct elf_i386_link_hash_table
*htab
;
738 if (! _bfd_elf_create_got_section (dynobj
, info
))
741 htab
= elf_i386_hash_table (info
);
742 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
743 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
744 if (!htab
->sgot
|| !htab
->sgotplt
)
747 htab
->srelgot
= bfd_make_section (dynobj
, ".rel.got");
748 if (htab
->srelgot
== NULL
749 || ! bfd_set_section_flags (dynobj
, htab
->srelgot
,
750 (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
751 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
753 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
758 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
759 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
763 elf_i386_create_dynamic_sections (dynobj
, info
)
765 struct bfd_link_info
*info
;
767 struct elf_i386_link_hash_table
*htab
;
769 htab
= elf_i386_hash_table (info
);
770 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
773 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
776 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
777 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
778 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
780 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
782 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
783 || (!info
->shared
&& !htab
->srelbss
))
789 /* Copy the extra info we tack onto an elf_link_hash_entry. */
792 elf_i386_copy_indirect_symbol (bed
, dir
, ind
)
793 struct elf_backend_data
*bed
;
794 struct elf_link_hash_entry
*dir
, *ind
;
796 struct elf_i386_link_hash_entry
*edir
, *eind
;
798 edir
= (struct elf_i386_link_hash_entry
*) dir
;
799 eind
= (struct elf_i386_link_hash_entry
*) ind
;
801 if (eind
->dyn_relocs
!= NULL
)
803 if (edir
->dyn_relocs
!= NULL
)
805 struct elf_i386_dyn_relocs
**pp
;
806 struct elf_i386_dyn_relocs
*p
;
808 if (ind
->root
.type
== bfd_link_hash_indirect
)
811 /* Add reloc counts against the weak sym to the strong sym
812 list. Merge any entries against the same section. */
813 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
815 struct elf_i386_dyn_relocs
*q
;
817 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
818 if (q
->sec
== p
->sec
)
820 q
->pc_count
+= p
->pc_count
;
821 q
->count
+= p
->count
;
828 *pp
= edir
->dyn_relocs
;
831 edir
->dyn_relocs
= eind
->dyn_relocs
;
832 eind
->dyn_relocs
= NULL
;
835 if (ind
->root
.type
== bfd_link_hash_indirect
836 && dir
->got
.refcount
<= 0)
838 edir
->tls_type
= eind
->tls_type
;
839 eind
->tls_type
= GOT_UNKNOWN
;
842 if (ELIMINATE_COPY_RELOCS
843 && ind
->root
.type
!= bfd_link_hash_indirect
844 && (dir
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
845 /* If called to transfer flags for a weakdef during processing
846 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
847 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
848 dir
->elf_link_hash_flags
|=
849 (ind
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_DYNAMIC
850 | ELF_LINK_HASH_REF_REGULAR
851 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
853 _bfd_elf_link_hash_copy_indirect (bed
, dir
, ind
);
857 elf_i386_tls_transition (info
, r_type
, is_local
)
858 struct bfd_link_info
*info
;
868 case R_386_TLS_IE_32
:
870 return R_386_TLS_LE_32
;
871 return R_386_TLS_IE_32
;
873 case R_386_TLS_GOTIE
:
875 return R_386_TLS_LE_32
;
878 return R_386_TLS_LE_32
;
884 /* Look through the relocs for a section during the first phase, and
885 calculate needed space in the global offset table, procedure linkage
886 table, and dynamic reloc sections. */
889 elf_i386_check_relocs (abfd
, info
, sec
, relocs
)
891 struct bfd_link_info
*info
;
893 const Elf_Internal_Rela
*relocs
;
895 struct elf_i386_link_hash_table
*htab
;
896 Elf_Internal_Shdr
*symtab_hdr
;
897 struct elf_link_hash_entry
**sym_hashes
;
898 const Elf_Internal_Rela
*rel
;
899 const Elf_Internal_Rela
*rel_end
;
902 if (info
->relocateable
)
905 htab
= elf_i386_hash_table (info
);
906 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
907 sym_hashes
= elf_sym_hashes (abfd
);
911 rel_end
= relocs
+ sec
->reloc_count
;
912 for (rel
= relocs
; rel
< rel_end
; rel
++)
915 unsigned long r_symndx
;
916 struct elf_link_hash_entry
*h
;
918 r_symndx
= ELF32_R_SYM (rel
->r_info
);
919 r_type
= ELF32_R_TYPE (rel
->r_info
);
921 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
923 (*_bfd_error_handler
) (_("%s: bad symbol index: %d"),
924 bfd_archive_filename (abfd
),
929 if (r_symndx
< symtab_hdr
->sh_info
)
932 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
934 r_type
= elf_i386_tls_transition (info
, r_type
, h
== NULL
);
939 htab
->tls_ldm_got
.refcount
+= 1;
943 /* This symbol requires a procedure linkage table entry. We
944 actually build the entry in adjust_dynamic_symbol,
945 because this might be a case of linking PIC code which is
946 never referenced by a dynamic object, in which case we
947 don't need to generate a procedure linkage table entry
950 /* If this is a local symbol, we resolve it directly without
951 creating a procedure linkage table entry. */
955 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
956 h
->plt
.refcount
+= 1;
959 case R_386_TLS_IE_32
:
961 case R_386_TLS_GOTIE
:
963 info
->flags
|= DF_STATIC_TLS
;
968 /* This symbol requires a global offset table entry. */
970 int tls_type
, old_tls_type
;
975 case R_386_GOT32
: tls_type
= GOT_NORMAL
; break;
976 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
977 case R_386_TLS_IE_32
:
978 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
979 tls_type
= GOT_TLS_IE_NEG
;
981 /* If this is a GD->IE transition, we may use either of
982 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
983 tls_type
= GOT_TLS_IE
;
986 case R_386_TLS_GOTIE
:
987 tls_type
= GOT_TLS_IE_POS
; break;
992 h
->got
.refcount
+= 1;
993 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
997 bfd_signed_vma
*local_got_refcounts
;
999 /* This is a global offset table entry for a local symbol. */
1000 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1001 if (local_got_refcounts
== NULL
)
1005 size
= symtab_hdr
->sh_info
;
1006 size
*= (sizeof (bfd_signed_vma
) + sizeof(char));
1007 local_got_refcounts
= ((bfd_signed_vma
*)
1008 bfd_zalloc (abfd
, size
));
1009 if (local_got_refcounts
== NULL
)
1011 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1012 elf_i386_local_got_tls_type (abfd
)
1013 = (char *) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1015 local_got_refcounts
[r_symndx
] += 1;
1016 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
1019 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1020 tls_type
|= old_tls_type
;
1021 /* If a TLS symbol is accessed using IE at least once,
1022 there is no point to use dynamic model for it. */
1023 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1024 && (old_tls_type
!= GOT_TLS_GD
1025 || (tls_type
& GOT_TLS_IE
) == 0))
1027 if ((old_tls_type
& GOT_TLS_IE
) && tls_type
== GOT_TLS_GD
)
1028 tls_type
= old_tls_type
;
1031 (*_bfd_error_handler
)
1032 (_("%s: `%s' accessed both as normal and thread local symbol"),
1033 bfd_archive_filename (abfd
),
1034 h
? h
->root
.root
.string
: "<local>");
1039 if (old_tls_type
!= tls_type
)
1042 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
1044 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1052 if (htab
->sgot
== NULL
)
1054 if (htab
->elf
.dynobj
== NULL
)
1055 htab
->elf
.dynobj
= abfd
;
1056 if (!create_got_section (htab
->elf
.dynobj
, info
))
1059 if (r_type
!= R_386_TLS_IE
)
1063 case R_386_TLS_LE_32
:
1067 info
->flags
|= DF_STATIC_TLS
;
1072 if (h
!= NULL
&& !info
->shared
)
1074 /* If this reloc is in a read-only section, we might
1075 need a copy reloc. We can't check reliably at this
1076 stage whether the section is read-only, as input
1077 sections have not yet been mapped to output sections.
1078 Tentatively set the flag for now, and correct in
1079 adjust_dynamic_symbol. */
1080 h
->elf_link_hash_flags
|= ELF_LINK_NON_GOT_REF
;
1082 /* We may need a .plt entry if the function this reloc
1083 refers to is in a shared lib. */
1084 h
->plt
.refcount
+= 1;
1087 /* If we are creating a shared library, and this is a reloc
1088 against a global symbol, or a non PC relative reloc
1089 against a local symbol, then we need to copy the reloc
1090 into the shared library. However, if we are linking with
1091 -Bsymbolic, we do not need to copy a reloc against a
1092 global symbol which is defined in an object we are
1093 including in the link (i.e., DEF_REGULAR is set). At
1094 this point we have not seen all the input files, so it is
1095 possible that DEF_REGULAR is not set now but will be set
1096 later (it is never cleared). In case of a weak definition,
1097 DEF_REGULAR may be cleared later by a strong definition in
1098 a shared library. We account for that possibility below by
1099 storing information in the relocs_copied field of the hash
1100 table entry. A similar situation occurs when creating
1101 shared libraries and symbol visibility changes render the
1104 If on the other hand, we are creating an executable, we
1105 may need to keep relocations for symbols satisfied by a
1106 dynamic library if we manage to avoid copy relocs for the
1109 && (sec
->flags
& SEC_ALLOC
) != 0
1110 && (r_type
!= R_386_PC32
1112 && (! info
->symbolic
1113 || h
->root
.type
== bfd_link_hash_defweak
1114 || (h
->elf_link_hash_flags
1115 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
1116 || (ELIMINATE_COPY_RELOCS
1118 && (sec
->flags
& SEC_ALLOC
) != 0
1120 && (h
->root
.type
== bfd_link_hash_defweak
1121 || (h
->elf_link_hash_flags
1122 & ELF_LINK_HASH_DEF_REGULAR
) == 0)))
1124 struct elf_i386_dyn_relocs
*p
;
1125 struct elf_i386_dyn_relocs
**head
;
1127 /* We must copy these reloc types into the output file.
1128 Create a reloc section in dynobj and make room for
1134 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
1135 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
1137 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
1141 if (strncmp (name
, ".rel", 4) != 0
1142 || strcmp (bfd_get_section_name (abfd
, sec
),
1145 (*_bfd_error_handler
)
1146 (_("%s: bad relocation section name `%s\'"),
1147 bfd_archive_filename (abfd
), name
);
1150 if (htab
->elf
.dynobj
== NULL
)
1151 htab
->elf
.dynobj
= abfd
;
1153 dynobj
= htab
->elf
.dynobj
;
1154 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1159 sreloc
= bfd_make_section (dynobj
, name
);
1160 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
1161 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1162 if ((sec
->flags
& SEC_ALLOC
) != 0)
1163 flags
|= SEC_ALLOC
| SEC_LOAD
;
1165 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
1166 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
1169 elf_section_data (sec
)->sreloc
= sreloc
;
1172 /* If this is a global symbol, we count the number of
1173 relocations we need for this symbol. */
1176 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1180 /* Track dynamic relocs needed for local syms too.
1181 We really need local syms available to do this
1185 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1190 head
= ((struct elf_i386_dyn_relocs
**)
1191 &elf_section_data (s
)->local_dynrel
);
1195 if (p
== NULL
|| p
->sec
!= sec
)
1197 bfd_size_type amt
= sizeof *p
;
1198 p
= ((struct elf_i386_dyn_relocs
*)
1199 bfd_alloc (htab
->elf
.dynobj
, amt
));
1210 if (r_type
== R_386_PC32
)
1215 /* This relocation describes the C++ object vtable hierarchy.
1216 Reconstruct it for later use during GC. */
1217 case R_386_GNU_VTINHERIT
:
1218 if (!_bfd_elf32_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1222 /* This relocation describes which C++ vtable entries are actually
1223 used. Record for later use during GC. */
1224 case R_386_GNU_VTENTRY
:
1225 if (!_bfd_elf32_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1237 /* Return the section that should be marked against GC for a given
1241 elf_i386_gc_mark_hook (sec
, info
, rel
, h
, sym
)
1243 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1244 Elf_Internal_Rela
*rel
;
1245 struct elf_link_hash_entry
*h
;
1246 Elf_Internal_Sym
*sym
;
1250 switch (ELF32_R_TYPE (rel
->r_info
))
1252 case R_386_GNU_VTINHERIT
:
1253 case R_386_GNU_VTENTRY
:
1257 switch (h
->root
.type
)
1259 case bfd_link_hash_defined
:
1260 case bfd_link_hash_defweak
:
1261 return h
->root
.u
.def
.section
;
1263 case bfd_link_hash_common
:
1264 return h
->root
.u
.c
.p
->section
;
1272 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
1277 /* Update the got entry reference counts for the section being removed. */
1280 elf_i386_gc_sweep_hook (abfd
, info
, sec
, relocs
)
1282 struct bfd_link_info
*info
;
1284 const Elf_Internal_Rela
*relocs
;
1286 Elf_Internal_Shdr
*symtab_hdr
;
1287 struct elf_link_hash_entry
**sym_hashes
;
1288 bfd_signed_vma
*local_got_refcounts
;
1289 const Elf_Internal_Rela
*rel
, *relend
;
1291 elf_section_data (sec
)->local_dynrel
= NULL
;
1293 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1294 sym_hashes
= elf_sym_hashes (abfd
);
1295 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1297 relend
= relocs
+ sec
->reloc_count
;
1298 for (rel
= relocs
; rel
< relend
; rel
++)
1300 unsigned long r_symndx
;
1301 unsigned int r_type
;
1302 struct elf_link_hash_entry
*h
= NULL
;
1304 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1305 if (r_symndx
>= symtab_hdr
->sh_info
)
1307 struct elf_i386_link_hash_entry
*eh
;
1308 struct elf_i386_dyn_relocs
**pp
;
1309 struct elf_i386_dyn_relocs
*p
;
1311 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1312 eh
= (struct elf_i386_link_hash_entry
*) h
;
1314 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1317 /* Everything must go for SEC. */
1323 r_type
= ELF32_R_TYPE (rel
->r_info
);
1324 r_type
= elf_i386_tls_transition (info
, r_type
, h
!= NULL
);
1328 if (elf_i386_hash_table (info
)->tls_ldm_got
.refcount
> 0)
1329 elf_i386_hash_table (info
)->tls_ldm_got
.refcount
-= 1;
1333 case R_386_TLS_IE_32
:
1335 case R_386_TLS_GOTIE
:
1339 if (h
->got
.refcount
> 0)
1340 h
->got
.refcount
-= 1;
1342 else if (local_got_refcounts
!= NULL
)
1344 if (local_got_refcounts
[r_symndx
] > 0)
1345 local_got_refcounts
[r_symndx
] -= 1;
1358 if (h
->plt
.refcount
> 0)
1359 h
->plt
.refcount
-= 1;
1371 /* Adjust a symbol defined by a dynamic object and referenced by a
1372 regular object. The current definition is in some section of the
1373 dynamic object, but we're not including those sections. We have to
1374 change the definition to something the rest of the link can
1378 elf_i386_adjust_dynamic_symbol (info
, h
)
1379 struct bfd_link_info
*info
;
1380 struct elf_link_hash_entry
*h
;
1382 struct elf_i386_link_hash_table
*htab
;
1384 unsigned int power_of_two
;
1386 /* If this is a function, put it in the procedure linkage table. We
1387 will fill in the contents of the procedure linkage table later,
1388 when we know the address of the .got section. */
1389 if (h
->type
== STT_FUNC
1390 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
1392 if (h
->plt
.refcount
<= 0
1394 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1395 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0
1396 && h
->root
.type
!= bfd_link_hash_undefweak
1397 && h
->root
.type
!= bfd_link_hash_undefined
))
1399 /* This case can occur if we saw a PLT32 reloc in an input
1400 file, but the symbol was never referred to by a dynamic
1401 object, or if all references were garbage collected. In
1402 such a case, we don't actually need to build a procedure
1403 linkage table, and we can just do a PC32 reloc instead. */
1404 h
->plt
.offset
= (bfd_vma
) -1;
1405 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1411 /* It's possible that we incorrectly decided a .plt reloc was
1412 needed for an R_386_PC32 reloc to a non-function sym in
1413 check_relocs. We can't decide accurately between function and
1414 non-function syms in check-relocs; Objects loaded later in
1415 the link may change h->type. So fix it now. */
1416 h
->plt
.offset
= (bfd_vma
) -1;
1418 /* If this is a weak symbol, and there is a real definition, the
1419 processor independent code will have arranged for us to see the
1420 real definition first, and we can just use the same value. */
1421 if (h
->weakdef
!= NULL
)
1423 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
1424 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
1425 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
1426 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
1427 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1428 h
->elf_link_hash_flags
1429 = ((h
->elf_link_hash_flags
& ~ELF_LINK_NON_GOT_REF
)
1430 | (h
->weakdef
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
));
1434 /* This is a reference to a symbol defined by a dynamic object which
1435 is not a function. */
1437 /* If we are creating a shared library, we must presume that the
1438 only references to the symbol are via the global offset table.
1439 For such cases we need not do anything here; the relocations will
1440 be handled correctly by relocate_section. */
1444 /* If there are no references to this symbol that do not use the
1445 GOT, we don't need to generate a copy reloc. */
1446 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0)
1449 /* If -z nocopyreloc was given, we won't generate them either. */
1450 if (info
->nocopyreloc
)
1452 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_GOT_REF
;
1456 if (ELIMINATE_COPY_RELOCS
)
1458 struct elf_i386_link_hash_entry
* eh
;
1459 struct elf_i386_dyn_relocs
*p
;
1461 eh
= (struct elf_i386_link_hash_entry
*) h
;
1462 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1464 s
= p
->sec
->output_section
;
1465 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1469 /* If we didn't find any dynamic relocs in read-only sections, then
1470 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1473 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_GOT_REF
;
1478 /* We must allocate the symbol in our .dynbss section, which will
1479 become part of the .bss section of the executable. There will be
1480 an entry for this symbol in the .dynsym section. The dynamic
1481 object will contain position independent code, so all references
1482 from the dynamic object to this symbol will go through the global
1483 offset table. The dynamic linker will use the .dynsym entry to
1484 determine the address it must put in the global offset table, so
1485 both the dynamic object and the regular object will refer to the
1486 same memory location for the variable. */
1488 htab
= elf_i386_hash_table (info
);
1490 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1491 copy the initial value out of the dynamic object and into the
1492 runtime process image. */
1493 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1495 htab
->srelbss
->_raw_size
+= sizeof (Elf32_External_Rel
);
1496 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
1499 /* We need to figure out the alignment required for this symbol. I
1500 have no idea how ELF linkers handle this. */
1501 power_of_two
= bfd_log2 (h
->size
);
1502 if (power_of_two
> 3)
1505 /* Apply the required alignment. */
1507 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
, (bfd_size_type
) (1 << power_of_two
));
1508 if (power_of_two
> bfd_get_section_alignment (htab
->elf
.dynobj
, s
))
1510 if (! bfd_set_section_alignment (htab
->elf
.dynobj
, s
, power_of_two
))
1514 /* Define the symbol as being at this point in the section. */
1515 h
->root
.u
.def
.section
= s
;
1516 h
->root
.u
.def
.value
= s
->_raw_size
;
1518 /* Increment the section size to make room for the symbol. */
1519 s
->_raw_size
+= h
->size
;
1524 /* This is the condition under which elf_i386_finish_dynamic_symbol
1525 will be called from elflink.h. If elflink.h doesn't call our
1526 finish_dynamic_symbol routine, we'll need to do something about
1527 initializing any .plt and .got entries in elf_i386_relocate_section. */
1528 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1531 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1532 && ((H)->dynindx != -1 \
1533 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1535 /* Allocate space in .plt, .got and associated reloc sections for
1539 allocate_dynrelocs (h
, inf
)
1540 struct elf_link_hash_entry
*h
;
1543 struct bfd_link_info
*info
;
1544 struct elf_i386_link_hash_table
*htab
;
1545 struct elf_i386_link_hash_entry
*eh
;
1546 struct elf_i386_dyn_relocs
*p
;
1548 if (h
->root
.type
== bfd_link_hash_indirect
)
1551 if (h
->root
.type
== bfd_link_hash_warning
)
1552 /* When warning symbols are created, they **replace** the "real"
1553 entry in the hash table, thus we never get to see the real
1554 symbol in a hash traversal. So look at it now. */
1555 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1557 info
= (struct bfd_link_info
*) inf
;
1558 htab
= elf_i386_hash_table (info
);
1560 if (htab
->elf
.dynamic_sections_created
1561 && h
->plt
.refcount
> 0
1562 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1563 || h
->root
.type
!= bfd_link_hash_undefweak
))
1565 /* Make sure this symbol is output as a dynamic symbol.
1566 Undefined weak syms won't yet be marked as dynamic. */
1567 if (h
->dynindx
== -1
1568 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1570 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1575 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1577 asection
*s
= htab
->splt
;
1579 /* If this is the first .plt entry, make room for the special
1581 if (s
->_raw_size
== 0)
1582 s
->_raw_size
+= PLT_ENTRY_SIZE
;
1584 h
->plt
.offset
= s
->_raw_size
;
1586 /* If this symbol is not defined in a regular file, and we are
1587 not generating a shared library, then set the symbol to this
1588 location in the .plt. This is required to make function
1589 pointers compare as equal between the normal executable and
1590 the shared library. */
1592 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1594 h
->root
.u
.def
.section
= s
;
1595 h
->root
.u
.def
.value
= h
->plt
.offset
;
1598 /* Make room for this entry. */
1599 s
->_raw_size
+= PLT_ENTRY_SIZE
;
1601 /* We also need to make an entry in the .got.plt section, which
1602 will be placed in the .got section by the linker script. */
1603 htab
->sgotplt
->_raw_size
+= 4;
1605 /* We also need to make an entry in the .rel.plt section. */
1606 htab
->srelplt
->_raw_size
+= sizeof (Elf32_External_Rel
);
1610 h
->plt
.offset
= (bfd_vma
) -1;
1611 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1616 h
->plt
.offset
= (bfd_vma
) -1;
1617 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1620 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1621 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1622 if (h
->got
.refcount
> 0
1625 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
1626 h
->got
.offset
= (bfd_vma
) -1;
1627 else if (h
->got
.refcount
> 0)
1631 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1633 /* Make sure this symbol is output as a dynamic symbol.
1634 Undefined weak syms won't yet be marked as dynamic. */
1635 if (h
->dynindx
== -1
1636 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1638 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1643 h
->got
.offset
= s
->_raw_size
;
1645 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1646 if (tls_type
== GOT_TLS_GD
|| tls_type
== GOT_TLS_IE_BOTH
)
1648 dyn
= htab
->elf
.dynamic_sections_created
;
1649 /* R_386_TLS_IE_32 needs one dynamic relocation,
1650 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1651 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1652 need two), R_386_TLS_GD needs one if local symbol and two if
1654 if (tls_type
== GOT_TLS_IE_BOTH
)
1655 htab
->srelgot
->_raw_size
+= 2 * sizeof (Elf32_External_Rel
);
1656 else if ((tls_type
== GOT_TLS_GD
&& h
->dynindx
== -1)
1657 || (tls_type
& GOT_TLS_IE
))
1658 htab
->srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
1659 else if (tls_type
== GOT_TLS_GD
)
1660 htab
->srelgot
->_raw_size
+= 2 * sizeof (Elf32_External_Rel
);
1661 else if ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1662 || h
->root
.type
!= bfd_link_hash_undefweak
)
1664 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1665 htab
->srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
1668 h
->got
.offset
= (bfd_vma
) -1;
1670 eh
= (struct elf_i386_link_hash_entry
*) h
;
1671 if (eh
->dyn_relocs
== NULL
)
1674 /* In the shared -Bsymbolic case, discard space allocated for
1675 dynamic pc-relative relocs against symbols which turn out to be
1676 defined in regular objects. For the normal shared case, discard
1677 space for pc-relative relocs that have become local due to symbol
1678 visibility changes. */
1682 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
1684 struct elf_i386_dyn_relocs
**pp
;
1686 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1688 p
->count
-= p
->pc_count
;
1697 /* Also discard relocs on undefined weak syms with non-default
1699 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1700 && h
->root
.type
== bfd_link_hash_undefweak
)
1701 eh
->dyn_relocs
= NULL
;
1703 else if (ELIMINATE_COPY_RELOCS
)
1705 /* For the non-shared case, discard space for relocs against
1706 symbols which turn out to need copy relocs or are not
1709 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
1710 && (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1711 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1712 || (htab
->elf
.dynamic_sections_created
1713 && (h
->root
.type
== bfd_link_hash_undefweak
1714 || h
->root
.type
== bfd_link_hash_undefined
))))
1716 /* Make sure this symbol is output as a dynamic symbol.
1717 Undefined weak syms won't yet be marked as dynamic. */
1718 if (h
->dynindx
== -1
1719 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1721 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1725 /* If that succeeded, we know we'll be keeping all the
1727 if (h
->dynindx
!= -1)
1731 eh
->dyn_relocs
= NULL
;
1736 /* Finally, allocate space. */
1737 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1739 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1740 sreloc
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
1746 /* Find any dynamic relocs that apply to read-only sections. */
1749 readonly_dynrelocs (h
, inf
)
1750 struct elf_link_hash_entry
*h
;
1753 struct elf_i386_link_hash_entry
*eh
;
1754 struct elf_i386_dyn_relocs
*p
;
1756 if (h
->root
.type
== bfd_link_hash_warning
)
1757 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1759 eh
= (struct elf_i386_link_hash_entry
*) h
;
1760 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1762 asection
*s
= p
->sec
->output_section
;
1764 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1766 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1768 info
->flags
|= DF_TEXTREL
;
1770 /* Not an error, just cut short the traversal. */
1777 /* Set the sizes of the dynamic sections. */
1780 elf_i386_size_dynamic_sections (output_bfd
, info
)
1781 bfd
*output_bfd ATTRIBUTE_UNUSED
;
1782 struct bfd_link_info
*info
;
1784 struct elf_i386_link_hash_table
*htab
;
1790 htab
= elf_i386_hash_table (info
);
1791 dynobj
= htab
->elf
.dynobj
;
1795 if (htab
->elf
.dynamic_sections_created
)
1797 /* Set the contents of the .interp section to the interpreter. */
1800 s
= bfd_get_section_by_name (dynobj
, ".interp");
1803 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1804 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1808 /* Set up .got offsets for local syms, and space for local dynamic
1810 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1812 bfd_signed_vma
*local_got
;
1813 bfd_signed_vma
*end_local_got
;
1814 char *local_tls_type
;
1815 bfd_size_type locsymcount
;
1816 Elf_Internal_Shdr
*symtab_hdr
;
1819 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
1822 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1824 struct elf_i386_dyn_relocs
*p
;
1826 for (p
= *((struct elf_i386_dyn_relocs
**)
1827 &elf_section_data (s
)->local_dynrel
);
1831 if (!bfd_is_abs_section (p
->sec
)
1832 && bfd_is_abs_section (p
->sec
->output_section
))
1834 /* Input section has been discarded, either because
1835 it is a copy of a linkonce section or due to
1836 linker script /DISCARD/, so we'll be discarding
1839 else if (p
->count
!= 0)
1841 srel
= elf_section_data (p
->sec
)->sreloc
;
1842 srel
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
1843 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1844 info
->flags
|= DF_TEXTREL
;
1849 local_got
= elf_local_got_refcounts (ibfd
);
1853 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
1854 locsymcount
= symtab_hdr
->sh_info
;
1855 end_local_got
= local_got
+ locsymcount
;
1856 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
1858 srel
= htab
->srelgot
;
1859 for (; local_got
< end_local_got
; ++local_got
, ++local_tls_type
)
1863 *local_got
= s
->_raw_size
;
1865 if (*local_tls_type
== GOT_TLS_GD
1866 || *local_tls_type
== GOT_TLS_IE_BOTH
)
1869 || *local_tls_type
== GOT_TLS_GD
1870 || (*local_tls_type
& GOT_TLS_IE
))
1872 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
1873 srel
->_raw_size
+= 2 * sizeof (Elf32_External_Rel
);
1875 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
1879 *local_got
= (bfd_vma
) -1;
1883 if (htab
->tls_ldm_got
.refcount
> 0)
1885 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1887 htab
->tls_ldm_got
.offset
= htab
->sgot
->_raw_size
;
1888 htab
->sgot
->_raw_size
+= 8;
1889 htab
->srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
1892 htab
->tls_ldm_got
.offset
= -1;
1894 /* Allocate global sym .plt and .got entries, and space for global
1895 sym dynamic relocs. */
1896 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, (PTR
) info
);
1898 /* We now have determined the sizes of the various dynamic sections.
1899 Allocate memory for them. */
1901 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1903 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1908 || s
== htab
->sgotplt
)
1910 /* Strip this section if we don't need it; see the
1913 else if (strncmp (bfd_get_section_name (dynobj
, s
), ".rel", 4) == 0)
1915 if (s
->_raw_size
!= 0 && s
!= htab
->srelplt
)
1918 /* We use the reloc_count field as a counter if we need
1919 to copy relocs into the output file. */
1924 /* It's not one of our sections, so don't allocate space. */
1928 if (s
->_raw_size
== 0)
1930 /* If we don't need this section, strip it from the
1931 output file. This is mostly to handle .rel.bss and
1932 .rel.plt. We must create both sections in
1933 create_dynamic_sections, because they must be created
1934 before the linker maps input sections to output
1935 sections. The linker does that before
1936 adjust_dynamic_symbol is called, and it is that
1937 function which decides whether anything needs to go
1938 into these sections. */
1940 _bfd_strip_section_from_output (info
, s
);
1944 /* Allocate memory for the section contents. We use bfd_zalloc
1945 here in case unused entries are not reclaimed before the
1946 section's contents are written out. This should not happen,
1947 but this way if it does, we get a R_386_NONE reloc instead
1949 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->_raw_size
);
1950 if (s
->contents
== NULL
)
1954 if (htab
->elf
.dynamic_sections_created
)
1956 /* Add some entries to the .dynamic section. We fill in the
1957 values later, in elf_i386_finish_dynamic_sections, but we
1958 must add the entries now so that we get the correct size for
1959 the .dynamic section. The DT_DEBUG entry is filled in by the
1960 dynamic linker and used by the debugger. */
1961 #define add_dynamic_entry(TAG, VAL) \
1962 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1966 if (!add_dynamic_entry (DT_DEBUG
, 0))
1970 if (htab
->splt
->_raw_size
!= 0)
1972 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1973 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1974 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
1975 || !add_dynamic_entry (DT_JMPREL
, 0))
1981 if (!add_dynamic_entry (DT_REL
, 0)
1982 || !add_dynamic_entry (DT_RELSZ
, 0)
1983 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
1986 /* If any dynamic relocs apply to a read-only section,
1987 then we need a DT_TEXTREL entry. */
1988 if ((info
->flags
& DF_TEXTREL
) == 0)
1989 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
,
1992 if ((info
->flags
& DF_TEXTREL
) != 0)
1994 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1999 #undef add_dynamic_entry
2004 /* Set the correct type for an x86 ELF section. We do this by the
2005 section name, which is a hack, but ought to work. */
2008 elf_i386_fake_sections (abfd
, hdr
, sec
)
2009 bfd
*abfd ATTRIBUTE_UNUSED
;
2010 Elf_Internal_Shdr
*hdr
;
2013 register const char *name
;
2015 name
= bfd_get_section_name (abfd
, sec
);
2017 /* This is an ugly, but unfortunately necessary hack that is
2018 needed when producing EFI binaries on x86. It tells
2019 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2020 containing ELF relocation info. We need this hack in order to
2021 be able to generate ELF binaries that can be translated into
2022 EFI applications (which are essentially COFF objects). Those
2023 files contain a COFF ".reloc" section inside an ELFNN object,
2024 which would normally cause BFD to segfault because it would
2025 attempt to interpret this section as containing relocation
2026 entries for section "oc". With this hack enabled, ".reloc"
2027 will be treated as a normal data section, which will avoid the
2028 segfault. However, you won't be able to create an ELFNN binary
2029 with a section named "oc" that needs relocations, but that's
2030 the kind of ugly side-effects you get when detecting section
2031 types based on their names... In practice, this limitation is
2032 unlikely to bite. */
2033 if (strcmp (name
, ".reloc") == 0)
2034 hdr
->sh_type
= SHT_PROGBITS
;
2039 /* Return the base VMA address which should be subtracted from real addresses
2040 when resolving @dtpoff relocation.
2041 This is PT_TLS segment p_vaddr. */
2045 struct bfd_link_info
*info
;
2047 /* If tls_segment is NULL, we should have signalled an error already. */
2048 if (elf_hash_table (info
)->tls_segment
== NULL
)
2050 return elf_hash_table (info
)->tls_segment
->start
;
2053 /* Return the relocation value for @tpoff relocation
2054 if STT_TLS virtual address is ADDRESS. */
2057 tpoff (info
, address
)
2058 struct bfd_link_info
*info
;
2061 struct elf_link_tls_segment
*tls_segment
2062 = elf_hash_table (info
)->tls_segment
;
2064 /* If tls_segment is NULL, we should have signalled an error already. */
2065 if (tls_segment
== NULL
)
2067 return (align_power (tls_segment
->size
, tls_segment
->align
)
2068 + tls_segment
->start
- address
);
2071 /* Relocate an i386 ELF section. */
2074 elf_i386_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
2075 contents
, relocs
, local_syms
, local_sections
)
2077 struct bfd_link_info
*info
;
2079 asection
*input_section
;
2081 Elf_Internal_Rela
*relocs
;
2082 Elf_Internal_Sym
*local_syms
;
2083 asection
**local_sections
;
2085 struct elf_i386_link_hash_table
*htab
;
2086 Elf_Internal_Shdr
*symtab_hdr
;
2087 struct elf_link_hash_entry
**sym_hashes
;
2088 bfd_vma
*local_got_offsets
;
2089 Elf_Internal_Rela
*rel
;
2090 Elf_Internal_Rela
*relend
;
2092 htab
= elf_i386_hash_table (info
);
2093 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2094 sym_hashes
= elf_sym_hashes (input_bfd
);
2095 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2098 relend
= relocs
+ input_section
->reloc_count
;
2099 for (; rel
< relend
; rel
++)
2101 unsigned int r_type
;
2102 reloc_howto_type
*howto
;
2103 unsigned long r_symndx
;
2104 struct elf_link_hash_entry
*h
;
2105 Elf_Internal_Sym
*sym
;
2109 bfd_boolean unresolved_reloc
;
2110 bfd_reloc_status_type r
;
2114 r_type
= ELF32_R_TYPE (rel
->r_info
);
2115 if (r_type
== (int) R_386_GNU_VTINHERIT
2116 || r_type
== (int) R_386_GNU_VTENTRY
)
2119 if ((indx
= (unsigned) r_type
) >= R_386_standard
2120 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
2121 >= R_386_ext
- R_386_standard
)
2122 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
2123 >= R_386_tls
- R_386_ext
))
2125 bfd_set_error (bfd_error_bad_value
);
2128 howto
= elf_howto_table
+ indx
;
2130 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2132 if (info
->relocateable
)
2137 /* This is a relocatable link. We don't have to change
2138 anything, unless the reloc is against a section symbol,
2139 in which case we have to adjust according to where the
2140 section symbol winds up in the output section. */
2141 if (r_symndx
>= symtab_hdr
->sh_info
)
2144 sym
= local_syms
+ r_symndx
;
2145 if (ELF_ST_TYPE (sym
->st_info
) != STT_SECTION
)
2148 sec
= local_sections
[r_symndx
];
2149 val
= sec
->output_offset
;
2153 where
= contents
+ rel
->r_offset
;
2154 switch (howto
->size
)
2156 /* FIXME: overflow checks. */
2158 val
+= bfd_get_8 (input_bfd
, where
);
2159 bfd_put_8 (input_bfd
, val
, where
);
2162 val
+= bfd_get_16 (input_bfd
, where
);
2163 bfd_put_16 (input_bfd
, val
, where
);
2166 val
+= bfd_get_32 (input_bfd
, where
);
2167 bfd_put_32 (input_bfd
, val
, where
);
2175 /* This is a final link. */
2179 unresolved_reloc
= FALSE
;
2180 if (r_symndx
< symtab_hdr
->sh_info
)
2182 sym
= local_syms
+ r_symndx
;
2183 sec
= local_sections
[r_symndx
];
2184 relocation
= (sec
->output_section
->vma
2185 + sec
->output_offset
2187 if ((sec
->flags
& SEC_MERGE
)
2188 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2192 bfd_byte
*where
= contents
+ rel
->r_offset
;
2194 switch (howto
->size
)
2197 addend
= bfd_get_8 (input_bfd
, where
);
2198 if (howto
->pc_relative
)
2200 addend
= (addend
^ 0x80) - 0x80;
2205 addend
= bfd_get_16 (input_bfd
, where
);
2206 if (howto
->pc_relative
)
2208 addend
= (addend
^ 0x8000) - 0x8000;
2213 addend
= bfd_get_32 (input_bfd
, where
);
2214 if (howto
->pc_relative
)
2216 addend
= (addend
^ 0x80000000) - 0x80000000;
2225 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
);
2226 addend
-= relocation
;
2227 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2229 switch (howto
->size
)
2232 /* FIXME: overflow checks. */
2233 if (howto
->pc_relative
)
2235 bfd_put_8 (input_bfd
, addend
, where
);
2238 if (howto
->pc_relative
)
2240 bfd_put_16 (input_bfd
, addend
, where
);
2243 if (howto
->pc_relative
)
2245 bfd_put_32 (input_bfd
, addend
, where
);
2252 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2253 while (h
->root
.type
== bfd_link_hash_indirect
2254 || h
->root
.type
== bfd_link_hash_warning
)
2255 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2258 if (h
->root
.type
== bfd_link_hash_defined
2259 || h
->root
.type
== bfd_link_hash_defweak
)
2261 sec
= h
->root
.u
.def
.section
;
2262 if (sec
->output_section
== NULL
)
2263 /* Set a flag that will be cleared later if we find a
2264 relocation value for this symbol. output_section
2265 is typically NULL for symbols satisfied by a shared
2267 unresolved_reloc
= TRUE
;
2269 relocation
= (h
->root
.u
.def
.value
2270 + sec
->output_section
->vma
2271 + sec
->output_offset
);
2273 else if (h
->root
.type
== bfd_link_hash_undefweak
)
2275 else if (info
->shared
2276 && !info
->no_undefined
2277 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2281 if (! ((*info
->callbacks
->undefined_symbol
)
2282 (info
, h
->root
.root
.string
, input_bfd
,
2283 input_section
, rel
->r_offset
,
2284 (!info
->shared
|| info
->no_undefined
2285 || ELF_ST_VISIBILITY (h
->other
)))))
2293 /* Relocation is to the entry for this symbol in the global
2295 if (htab
->sgot
== NULL
)
2302 off
= h
->got
.offset
;
2303 dyn
= htab
->elf
.dynamic_sections_created
;
2304 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2306 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2307 || (ELF_ST_VISIBILITY (h
->other
)
2308 && h
->root
.type
== bfd_link_hash_undefweak
))
2310 /* This is actually a static link, or it is a
2311 -Bsymbolic link and the symbol is defined
2312 locally, or the symbol was forced to be local
2313 because of a version file. We must initialize
2314 this entry in the global offset table. Since the
2315 offset must always be a multiple of 4, we use the
2316 least significant bit to record whether we have
2317 initialized it already.
2319 When doing a dynamic link, we create a .rel.got
2320 relocation entry to initialize the value. This
2321 is done in the finish_dynamic_symbol routine. */
2326 bfd_put_32 (output_bfd
, relocation
,
2327 htab
->sgot
->contents
+ off
);
2332 unresolved_reloc
= FALSE
;
2336 if (local_got_offsets
== NULL
)
2339 off
= local_got_offsets
[r_symndx
];
2341 /* The offset must always be a multiple of 4. We use
2342 the least significant bit to record whether we have
2343 already generated the necessary reloc. */
2348 bfd_put_32 (output_bfd
, relocation
,
2349 htab
->sgot
->contents
+ off
);
2354 Elf_Internal_Rela outrel
;
2361 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2362 + htab
->sgot
->output_offset
2364 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2366 loc
+= s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2367 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2370 local_got_offsets
[r_symndx
] |= 1;
2374 if (off
>= (bfd_vma
) -2)
2377 relocation
= htab
->sgot
->output_offset
+ off
;
2381 /* Relocation is relative to the start of the global offset
2384 /* Note that sgot->output_offset is not involved in this
2385 calculation. We always want the start of .got. If we
2386 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2387 permitted by the ABI, we might have to change this
2389 relocation
-= htab
->sgot
->output_section
->vma
;
2393 /* Use global offset table as symbol value. */
2394 relocation
= htab
->sgot
->output_section
->vma
;
2395 unresolved_reloc
= FALSE
;
2399 /* Relocation is to the entry for this symbol in the
2400 procedure linkage table. */
2402 /* Resolve a PLT32 reloc against a local symbol directly,
2403 without using the procedure linkage table. */
2407 if (h
->plt
.offset
== (bfd_vma
) -1
2408 || htab
->splt
== NULL
)
2410 /* We didn't make a PLT entry for this symbol. This
2411 happens when statically linking PIC code, or when
2412 using -Bsymbolic. */
2416 relocation
= (htab
->splt
->output_section
->vma
2417 + htab
->splt
->output_offset
2419 unresolved_reloc
= FALSE
;
2424 /* r_symndx will be zero only for relocs against symbols
2425 from removed linkonce sections, or sections discarded by
2428 || (input_section
->flags
& SEC_ALLOC
) == 0)
2433 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2434 || h
->root
.type
!= bfd_link_hash_undefweak
)
2435 && (r_type
!= R_386_PC32
2437 && !SYMBOL_REFERENCES_LOCAL (info
, h
))))
2438 || (ELIMINATE_COPY_RELOCS
2442 && (h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
2443 && (((h
->elf_link_hash_flags
2444 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2445 && (h
->elf_link_hash_flags
2446 & ELF_LINK_HASH_DEF_REGULAR
) == 0)
2447 || h
->root
.type
== bfd_link_hash_undefweak
2448 || h
->root
.type
== bfd_link_hash_undefined
)))
2450 Elf_Internal_Rela outrel
;
2452 bfd_boolean skip
, relocate
;
2455 /* When generating a shared object, these relocations
2456 are copied into the output file to be resolved at run
2463 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2465 if (outrel
.r_offset
== (bfd_vma
) -1)
2467 else if (outrel
.r_offset
== (bfd_vma
) -2)
2468 skip
= TRUE
, relocate
= TRUE
;
2469 outrel
.r_offset
+= (input_section
->output_section
->vma
2470 + input_section
->output_offset
);
2473 memset (&outrel
, 0, sizeof outrel
);
2476 && (r_type
== R_386_PC32
2479 || (h
->elf_link_hash_flags
2480 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
2481 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2484 /* This symbol is local, or marked to become local. */
2486 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2489 sreloc
= elf_section_data (input_section
)->sreloc
;
2493 loc
= sreloc
->contents
;
2494 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2495 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2497 /* If this reloc is against an external symbol, we do
2498 not want to fiddle with the addend. Otherwise, we
2499 need to include the symbol value so that it becomes
2500 an addend for the dynamic reloc. */
2509 Elf_Internal_Rela outrel
;
2513 outrel
.r_offset
= rel
->r_offset
2514 + input_section
->output_section
->vma
2515 + input_section
->output_offset
;
2516 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2517 sreloc
= elf_section_data (input_section
)->sreloc
;
2520 loc
= sreloc
->contents
;
2521 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2522 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2527 case R_386_TLS_IE_32
:
2528 case R_386_TLS_GOTIE
:
2529 r_type
= elf_i386_tls_transition (info
, r_type
, h
== NULL
);
2530 tls_type
= GOT_UNKNOWN
;
2531 if (h
== NULL
&& local_got_offsets
)
2532 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
2535 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2536 if (!info
->shared
&& h
->dynindx
== -1 && (tls_type
& GOT_TLS_IE
))
2537 r_type
= R_386_TLS_LE_32
;
2539 if (tls_type
== GOT_TLS_IE
)
2540 tls_type
= GOT_TLS_IE_NEG
;
2541 if (r_type
== R_386_TLS_GD
)
2543 if (tls_type
== GOT_TLS_IE_POS
)
2544 r_type
= R_386_TLS_GOTIE
;
2545 else if (tls_type
& GOT_TLS_IE
)
2546 r_type
= R_386_TLS_IE_32
;
2549 if (r_type
== R_386_TLS_LE_32
)
2551 BFD_ASSERT (! unresolved_reloc
);
2552 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
2554 unsigned int val
, type
;
2557 /* GD->LE transition. */
2558 BFD_ASSERT (rel
->r_offset
>= 2);
2559 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2560 BFD_ASSERT (type
== 0x8d || type
== 0x04);
2561 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->_raw_size
);
2562 BFD_ASSERT (bfd_get_8 (input_bfd
,
2563 contents
+ rel
->r_offset
+ 4)
2565 BFD_ASSERT (rel
+ 1 < relend
);
2566 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2567 roff
= rel
->r_offset
+ 5;
2568 val
= bfd_get_8 (input_bfd
,
2569 contents
+ rel
->r_offset
- 1);
2572 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2574 movl %gs:0, %eax; subl $foo@tpoff, %eax
2575 (6 byte form of subl). */
2576 BFD_ASSERT (rel
->r_offset
>= 3);
2577 BFD_ASSERT (bfd_get_8 (input_bfd
,
2578 contents
+ rel
->r_offset
- 3)
2580 BFD_ASSERT ((val
& 0xc7) == 0x05 && val
!= (4 << 3));
2581 memcpy (contents
+ rel
->r_offset
- 3,
2582 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2586 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2587 if (rel
->r_offset
+ 10 <= input_section
->_raw_size
2588 && bfd_get_8 (input_bfd
,
2589 contents
+ rel
->r_offset
+ 9) == 0x90)
2591 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2593 movl %gs:0, %eax; subl $foo@tpoff, %eax
2594 (6 byte form of subl). */
2595 memcpy (contents
+ rel
->r_offset
- 2,
2596 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2597 roff
= rel
->r_offset
+ 6;
2601 /* leal foo(%reg), %eax; call ___tls_get_addr
2603 movl %gs:0, %eax; subl $foo@tpoff, %eax
2604 (5 byte form of subl). */
2605 memcpy (contents
+ rel
->r_offset
- 2,
2606 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2609 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2611 /* Skip R_386_PLT32. */
2615 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
2617 unsigned int val
, type
;
2619 /* IE->LE transition:
2620 Originally it can be one of:
2628 BFD_ASSERT (rel
->r_offset
>= 1);
2629 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2630 BFD_ASSERT (rel
->r_offset
+ 4 <= input_section
->_raw_size
);
2633 /* movl foo, %eax. */
2634 bfd_put_8 (output_bfd
, 0xb8, contents
+ rel
->r_offset
- 1);
2638 BFD_ASSERT (rel
->r_offset
>= 2);
2639 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2644 BFD_ASSERT ((val
& 0xc7) == 0x05);
2645 bfd_put_8 (output_bfd
, 0xc7,
2646 contents
+ rel
->r_offset
- 2);
2647 bfd_put_8 (output_bfd
,
2648 0xc0 | ((val
>> 3) & 7),
2649 contents
+ rel
->r_offset
- 1);
2653 BFD_ASSERT ((val
& 0xc7) == 0x05);
2654 bfd_put_8 (output_bfd
, 0x81,
2655 contents
+ rel
->r_offset
- 2);
2656 bfd_put_8 (output_bfd
,
2657 0xc0 | ((val
>> 3) & 7),
2658 contents
+ rel
->r_offset
- 1);
2665 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
2666 contents
+ rel
->r_offset
);
2671 unsigned int val
, type
;
2673 /* {IE_32,GOTIE}->LE transition:
2674 Originally it can be one of:
2675 subl foo(%reg1), %reg2
2676 movl foo(%reg1), %reg2
2677 addl foo(%reg1), %reg2
2680 movl $foo, %reg2 (6 byte form)
2681 addl $foo, %reg2. */
2682 BFD_ASSERT (rel
->r_offset
>= 2);
2683 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2684 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2685 BFD_ASSERT (rel
->r_offset
+ 4 <= input_section
->_raw_size
);
2686 BFD_ASSERT ((val
& 0xc0) == 0x80 && (val
& 7) != 4);
2690 bfd_put_8 (output_bfd
, 0xc7,
2691 contents
+ rel
->r_offset
- 2);
2692 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2693 contents
+ rel
->r_offset
- 1);
2695 else if (type
== 0x2b)
2698 bfd_put_8 (output_bfd
, 0x81,
2699 contents
+ rel
->r_offset
- 2);
2700 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
2701 contents
+ rel
->r_offset
- 1);
2703 else if (type
== 0x03)
2706 bfd_put_8 (output_bfd
, 0x81,
2707 contents
+ rel
->r_offset
- 2);
2708 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2709 contents
+ rel
->r_offset
- 1);
2713 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
2714 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
2715 contents
+ rel
->r_offset
);
2717 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2718 contents
+ rel
->r_offset
);
2723 if (htab
->sgot
== NULL
)
2727 off
= h
->got
.offset
;
2730 if (local_got_offsets
== NULL
)
2733 off
= local_got_offsets
[r_symndx
];
2740 Elf_Internal_Rela outrel
;
2744 if (htab
->srelgot
== NULL
)
2747 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2748 + htab
->sgot
->output_offset
+ off
);
2750 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2751 if (r_type
== R_386_TLS_GD
)
2752 dr_type
= R_386_TLS_DTPMOD32
;
2753 else if (tls_type
== GOT_TLS_IE_POS
)
2754 dr_type
= R_386_TLS_TPOFF
;
2756 dr_type
= R_386_TLS_TPOFF32
;
2757 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
2758 bfd_put_32 (output_bfd
, relocation
- dtpoff_base (info
),
2759 htab
->sgot
->contents
+ off
);
2760 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
2761 bfd_put_32 (output_bfd
, dtpoff_base (info
) - relocation
,
2762 htab
->sgot
->contents
+ off
);
2764 bfd_put_32 (output_bfd
, 0,
2765 htab
->sgot
->contents
+ off
);
2766 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
2767 loc
= htab
->srelgot
->contents
;
2768 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2769 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2771 if (r_type
== R_386_TLS_GD
)
2775 BFD_ASSERT (! unresolved_reloc
);
2776 bfd_put_32 (output_bfd
,
2777 relocation
- dtpoff_base (info
),
2778 htab
->sgot
->contents
+ off
+ 4);
2782 bfd_put_32 (output_bfd
, 0,
2783 htab
->sgot
->contents
+ off
+ 4);
2784 outrel
.r_info
= ELF32_R_INFO (indx
,
2785 R_386_TLS_DTPOFF32
);
2786 outrel
.r_offset
+= 4;
2787 htab
->srelgot
->reloc_count
++;
2788 loc
+= sizeof (Elf32_External_Rel
);
2789 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2792 else if (tls_type
== GOT_TLS_IE_BOTH
)
2794 bfd_put_32 (output_bfd
,
2795 indx
== 0 ? relocation
- dtpoff_base (info
) : 0,
2796 htab
->sgot
->contents
+ off
+ 4);
2797 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
2798 outrel
.r_offset
+= 4;
2799 htab
->srelgot
->reloc_count
++;
2800 loc
+= sizeof (Elf32_External_Rel
);
2801 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2807 local_got_offsets
[r_symndx
] |= 1;
2810 if (off
>= (bfd_vma
) -2)
2812 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
2814 relocation
= htab
->sgot
->output_offset
+ off
;
2815 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
2816 && tls_type
== GOT_TLS_IE_BOTH
)
2818 if (r_type
== R_386_TLS_IE
)
2819 relocation
+= htab
->sgot
->output_section
->vma
;
2820 unresolved_reloc
= FALSE
;
2824 unsigned int val
, type
;
2827 /* GD->IE transition. */
2828 BFD_ASSERT (rel
->r_offset
>= 2);
2829 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2830 BFD_ASSERT (type
== 0x8d || type
== 0x04);
2831 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->_raw_size
);
2832 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
+ 4)
2834 BFD_ASSERT (rel
+ 1 < relend
);
2835 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2836 roff
= rel
->r_offset
- 3;
2837 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2840 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2842 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2843 BFD_ASSERT (rel
->r_offset
>= 3);
2844 BFD_ASSERT (bfd_get_8 (input_bfd
,
2845 contents
+ rel
->r_offset
- 3)
2847 BFD_ASSERT ((val
& 0xc7) == 0x05 && val
!= (4 << 3));
2852 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2854 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2855 BFD_ASSERT (rel
->r_offset
+ 10 <= input_section
->_raw_size
);
2856 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2857 BFD_ASSERT (bfd_get_8 (input_bfd
,
2858 contents
+ rel
->r_offset
+ 9)
2860 roff
= rel
->r_offset
- 2;
2862 memcpy (contents
+ roff
,
2863 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2864 contents
[roff
+ 7] = 0x80 | (val
& 7);
2865 /* If foo is used only with foo@gotntpoff(%reg) and
2866 foo@indntpoff, but not with foo@gottpoff(%reg), change
2867 subl $foo@gottpoff(%reg), %eax
2869 addl $foo@gotntpoff(%reg), %eax. */
2870 if (r_type
== R_386_TLS_GOTIE
)
2872 contents
[roff
+ 6] = 0x03;
2873 if (tls_type
== GOT_TLS_IE_BOTH
)
2876 bfd_put_32 (output_bfd
, htab
->sgot
->output_offset
+ off
,
2877 contents
+ roff
+ 8);
2878 /* Skip R_386_PLT32. */
2889 /* LD->LE transition:
2891 leal foo(%reg), %eax; call ___tls_get_addr.
2893 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2894 BFD_ASSERT (rel
->r_offset
>= 2);
2895 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2)
2897 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2898 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2899 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->_raw_size
);
2900 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
+ 4)
2902 BFD_ASSERT (rel
+ 1 < relend
);
2903 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2904 memcpy (contents
+ rel
->r_offset
- 2,
2905 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2906 /* Skip R_386_PLT32. */
2911 if (htab
->sgot
== NULL
)
2914 off
= htab
->tls_ldm_got
.offset
;
2919 Elf_Internal_Rela outrel
;
2922 if (htab
->srelgot
== NULL
)
2925 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2926 + htab
->sgot
->output_offset
+ off
);
2928 bfd_put_32 (output_bfd
, 0,
2929 htab
->sgot
->contents
+ off
);
2930 bfd_put_32 (output_bfd
, 0,
2931 htab
->sgot
->contents
+ off
+ 4);
2932 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
2933 loc
= htab
->srelgot
->contents
;
2934 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2935 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2936 htab
->tls_ldm_got
.offset
|= 1;
2938 relocation
= htab
->sgot
->output_offset
+ off
;
2939 unresolved_reloc
= FALSE
;
2942 case R_386_TLS_LDO_32
:
2943 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
2944 relocation
-= dtpoff_base (info
);
2946 /* When converting LDO to LE, we must negate. */
2947 relocation
= -tpoff (info
, relocation
);
2950 case R_386_TLS_LE_32
:
2954 Elf_Internal_Rela outrel
;
2959 outrel
.r_offset
= rel
->r_offset
2960 + input_section
->output_section
->vma
2961 + input_section
->output_offset
;
2962 if (h
!= NULL
&& h
->dynindx
!= -1)
2966 if (r_type
== R_386_TLS_LE_32
)
2967 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
2969 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
2970 sreloc
= elf_section_data (input_section
)->sreloc
;
2973 loc
= sreloc
->contents
;
2974 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2975 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2978 else if (r_type
== R_386_TLS_LE_32
)
2979 relocation
= dtpoff_base (info
) - relocation
;
2981 relocation
-= dtpoff_base (info
);
2983 else if (r_type
== R_386_TLS_LE_32
)
2984 relocation
= tpoff (info
, relocation
);
2986 relocation
= -tpoff (info
, relocation
);
2993 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2994 because such sections are not SEC_ALLOC and thus ld.so will
2995 not process them. */
2996 if (unresolved_reloc
2997 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2998 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
3000 (*_bfd_error_handler
)
3001 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
3002 bfd_archive_filename (input_bfd
),
3003 bfd_get_section_name (input_bfd
, input_section
),
3004 (long) rel
->r_offset
,
3005 h
->root
.root
.string
);
3009 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3010 contents
, rel
->r_offset
,
3011 relocation
, (bfd_vma
) 0);
3013 if (r
!= bfd_reloc_ok
)
3018 name
= h
->root
.root
.string
;
3021 name
= bfd_elf_string_from_elf_section (input_bfd
,
3022 symtab_hdr
->sh_link
,
3027 name
= bfd_section_name (input_bfd
, sec
);
3030 if (r
== bfd_reloc_overflow
)
3032 if (! ((*info
->callbacks
->reloc_overflow
)
3033 (info
, name
, howto
->name
, (bfd_vma
) 0,
3034 input_bfd
, input_section
, rel
->r_offset
)))
3039 (*_bfd_error_handler
)
3040 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3041 bfd_archive_filename (input_bfd
),
3042 bfd_get_section_name (input_bfd
, input_section
),
3043 (long) rel
->r_offset
, name
, (int) r
);
3052 /* Finish up dynamic symbol handling. We set the contents of various
3053 dynamic sections here. */
3056 elf_i386_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
3058 struct bfd_link_info
*info
;
3059 struct elf_link_hash_entry
*h
;
3060 Elf_Internal_Sym
*sym
;
3062 struct elf_i386_link_hash_table
*htab
;
3064 htab
= elf_i386_hash_table (info
);
3066 if (h
->plt
.offset
!= (bfd_vma
) -1)
3070 Elf_Internal_Rela rel
;
3073 /* This symbol has an entry in the procedure linkage table. Set
3076 if (h
->dynindx
== -1
3077 || htab
->splt
== NULL
3078 || htab
->sgotplt
== NULL
3079 || htab
->srelplt
== NULL
)
3082 /* Get the index in the procedure linkage table which
3083 corresponds to this symbol. This is the index of this symbol
3084 in all the symbols for which we are making plt entries. The
3085 first entry in the procedure linkage table is reserved. */
3086 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3088 /* Get the offset into the .got table of the entry that
3089 corresponds to this function. Each .got entry is 4 bytes.
3090 The first three are reserved. */
3091 got_offset
= (plt_index
+ 3) * 4;
3093 /* Fill in the entry in the procedure linkage table. */
3096 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_plt_entry
,
3098 bfd_put_32 (output_bfd
,
3099 (htab
->sgotplt
->output_section
->vma
3100 + htab
->sgotplt
->output_offset
3102 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3106 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_pic_plt_entry
,
3108 bfd_put_32 (output_bfd
, got_offset
,
3109 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3112 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
3113 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3114 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3115 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3117 /* Fill in the entry in the global offset table. */
3118 bfd_put_32 (output_bfd
,
3119 (htab
->splt
->output_section
->vma
3120 + htab
->splt
->output_offset
3123 htab
->sgotplt
->contents
+ got_offset
);
3125 /* Fill in the entry in the .rel.plt section. */
3126 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3127 + htab
->sgotplt
->output_offset
3129 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
3130 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3131 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3133 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3135 /* Mark the symbol as undefined, rather than as defined in
3136 the .plt section. Leave the value alone. This is a clue
3137 for the dynamic linker, to make function pointer
3138 comparisons work between an application and shared
3140 sym
->st_shndx
= SHN_UNDEF
;
3144 if (h
->got
.offset
!= (bfd_vma
) -1
3145 && elf_i386_hash_entry(h
)->tls_type
!= GOT_TLS_GD
3146 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
3148 Elf_Internal_Rela rel
;
3151 /* This symbol has an entry in the global offset table. Set it
3154 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3157 rel
.r_offset
= (htab
->sgot
->output_section
->vma
3158 + htab
->sgot
->output_offset
3159 + (h
->got
.offset
& ~(bfd_vma
) 1));
3161 /* If this is a static link, or it is a -Bsymbolic link and the
3162 symbol is defined locally or was forced to be local because
3163 of a version file, we just want to emit a RELATIVE reloc.
3164 The entry in the global offset table will already have been
3165 initialized in the relocate_section function. */
3167 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3169 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3170 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3174 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3175 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
3176 htab
->sgot
->contents
+ h
->got
.offset
);
3177 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
3180 loc
= htab
->srelgot
->contents
;
3181 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3182 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3185 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
3187 Elf_Internal_Rela rel
;
3190 /* This symbol needs a copy reloc. Set it up. */
3192 if (h
->dynindx
== -1
3193 || (h
->root
.type
!= bfd_link_hash_defined
3194 && h
->root
.type
!= bfd_link_hash_defweak
)
3195 || htab
->srelbss
== NULL
)
3198 rel
.r_offset
= (h
->root
.u
.def
.value
3199 + h
->root
.u
.def
.section
->output_section
->vma
3200 + h
->root
.u
.def
.section
->output_offset
);
3201 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
3202 loc
= htab
->srelbss
->contents
;
3203 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3204 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3207 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3208 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3209 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3210 sym
->st_shndx
= SHN_ABS
;
3215 /* Used to decide how to sort relocs in an optimal manner for the
3216 dynamic linker, before writing them out. */
3218 static enum elf_reloc_type_class
3219 elf_i386_reloc_type_class (rela
)
3220 const Elf_Internal_Rela
*rela
;
3222 switch ((int) ELF32_R_TYPE (rela
->r_info
))
3224 case R_386_RELATIVE
:
3225 return reloc_class_relative
;
3226 case R_386_JUMP_SLOT
:
3227 return reloc_class_plt
;
3229 return reloc_class_copy
;
3231 return reloc_class_normal
;
3235 /* Finish up the dynamic sections. */
3238 elf_i386_finish_dynamic_sections (output_bfd
, info
)
3240 struct bfd_link_info
*info
;
3242 struct elf_i386_link_hash_table
*htab
;
3246 htab
= elf_i386_hash_table (info
);
3247 dynobj
= htab
->elf
.dynobj
;
3248 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3250 if (htab
->elf
.dynamic_sections_created
)
3252 Elf32_External_Dyn
*dyncon
, *dynconend
;
3254 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3257 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3258 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
3259 for (; dyncon
< dynconend
; dyncon
++)
3261 Elf_Internal_Dyn dyn
;
3264 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3272 dyn
.d_un
.d_ptr
= htab
->sgot
->output_section
->vma
;
3277 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3282 dyn
.d_un
.d_val
= s
->_raw_size
;
3286 /* My reading of the SVR4 ABI indicates that the
3287 procedure linkage table relocs (DT_JMPREL) should be
3288 included in the overall relocs (DT_REL). This is
3289 what Solaris does. However, UnixWare can not handle
3290 that case. Therefore, we override the DT_RELSZ entry
3291 here to make it not include the JMPREL relocs. */
3295 dyn
.d_un
.d_val
-= s
->_raw_size
;
3299 /* We may not be using the standard ELF linker script.
3300 If .rel.plt is the first .rel section, we adjust
3301 DT_REL to not include it. */
3305 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
3307 dyn
.d_un
.d_ptr
+= s
->_raw_size
;
3311 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3314 /* Fill in the first entry in the procedure linkage table. */
3315 if (htab
->splt
&& htab
->splt
->_raw_size
> 0)
3318 memcpy (htab
->splt
->contents
,
3319 elf_i386_pic_plt0_entry
, PLT_ENTRY_SIZE
);
3322 memcpy (htab
->splt
->contents
,
3323 elf_i386_plt0_entry
, PLT_ENTRY_SIZE
);
3324 bfd_put_32 (output_bfd
,
3325 (htab
->sgotplt
->output_section
->vma
3326 + htab
->sgotplt
->output_offset
3328 htab
->splt
->contents
+ 2);
3329 bfd_put_32 (output_bfd
,
3330 (htab
->sgotplt
->output_section
->vma
3331 + htab
->sgotplt
->output_offset
3333 htab
->splt
->contents
+ 8);
3336 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3337 really seem like the right value. */
3338 elf_section_data (htab
->splt
->output_section
)
3339 ->this_hdr
.sh_entsize
= 4;
3345 /* Fill in the first three entries in the global offset table. */
3346 if (htab
->sgotplt
->_raw_size
> 0)
3348 bfd_put_32 (output_bfd
,
3349 (sdyn
== NULL
? (bfd_vma
) 0
3350 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
3351 htab
->sgotplt
->contents
);
3352 bfd_put_32 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ 4);
3353 bfd_put_32 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ 8);
3356 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
3361 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3362 #define TARGET_LITTLE_NAME "elf32-i386"
3363 #define ELF_ARCH bfd_arch_i386
3364 #define ELF_MACHINE_CODE EM_386
3365 #define ELF_MAXPAGESIZE 0x1000
3367 #define elf_backend_can_gc_sections 1
3368 #define elf_backend_can_refcount 1
3369 #define elf_backend_want_got_plt 1
3370 #define elf_backend_plt_readonly 1
3371 #define elf_backend_want_plt_sym 0
3372 #define elf_backend_got_header_size 12
3373 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3375 /* Support RELA for objdump of prelink objects. */
3376 #define elf_info_to_howto elf_i386_info_to_howto_rel
3377 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3379 #define bfd_elf32_mkobject elf_i386_mkobject
3380 #define elf_backend_object_p elf_i386_object_p
3382 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3383 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3384 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3386 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3387 #define elf_backend_check_relocs elf_i386_check_relocs
3388 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3389 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3390 #define elf_backend_fake_sections elf_i386_fake_sections
3391 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3392 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3393 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3394 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3395 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3396 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3397 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3398 #define elf_backend_relocate_section elf_i386_relocate_section
3399 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3401 #include "elf32-target.h"
3403 /* FreeBSD support. */
3405 #undef TARGET_LITTLE_SYM
3406 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3407 #undef TARGET_LITTLE_NAME
3408 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3410 /* The kernel recognizes executables as valid only if they carry a
3411 "FreeBSD" label in the ELF header. So we put this label on all
3412 executables and (for simplicity) also all other object files. */
3414 static void elf_i386_post_process_headers
3415 PARAMS ((bfd
*, struct bfd_link_info
*));
3418 elf_i386_post_process_headers (abfd
, link_info
)
3420 struct bfd_link_info
*link_info ATTRIBUTE_UNUSED
;
3422 Elf_Internal_Ehdr
*i_ehdrp
;
3424 i_ehdrp
= elf_elfheader (abfd
);
3426 /* Put an ABI label supported by FreeBSD >= 4.1. */
3427 i_ehdrp
->e_ident
[EI_OSABI
] = ELFOSABI_FREEBSD
;
3428 #ifdef OLD_FREEBSD_ABI_LABEL
3429 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3430 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
3434 #undef elf_backend_post_process_headers
3435 #define elf_backend_post_process_headers elf_i386_post_process_headers
3437 #define elf32_bed elf32_i386_fbsd_bed
3439 #include "elf32-target.h"