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 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 /* 386 uses REL relocations instead of RELA. */
32 static reloc_howto_type elf_howto_table
[]=
34 HOWTO(R_386_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_bitfield
,
35 bfd_elf_generic_reloc
, "R_386_NONE",
36 TRUE
, 0x00000000, 0x00000000, FALSE
),
37 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
38 bfd_elf_generic_reloc
, "R_386_32",
39 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
40 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
41 bfd_elf_generic_reloc
, "R_386_PC32",
42 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
43 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
44 bfd_elf_generic_reloc
, "R_386_GOT32",
45 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
46 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
47 bfd_elf_generic_reloc
, "R_386_PLT32",
48 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
49 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
50 bfd_elf_generic_reloc
, "R_386_COPY",
51 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
52 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
53 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
54 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
55 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
56 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
57 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
58 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
59 bfd_elf_generic_reloc
, "R_386_RELATIVE",
60 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
61 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_386_GOTOFF",
63 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
64 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
65 bfd_elf_generic_reloc
, "R_386_GOTPC",
66 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
78 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
79 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_386_TLS_IE",
81 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
82 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
84 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
85 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
86 bfd_elf_generic_reloc
, "R_386_TLS_LE",
87 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
88 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_386_TLS_GD",
90 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
91 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
92 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
93 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
94 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_386_16",
96 TRUE
, 0xffff, 0xffff, FALSE
),
97 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_386_PC16",
99 TRUE
, 0xffff, 0xffff, TRUE
),
100 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_386_8",
102 TRUE
, 0xff, 0xff, FALSE
),
103 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
104 bfd_elf_generic_reloc
, "R_386_PC8",
105 TRUE
, 0xff, 0xff, TRUE
),
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
111 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
112 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
113 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
115 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
116 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
117 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
118 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
119 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
120 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
121 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
122 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
123 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
124 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
125 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
127 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
130 #define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
131 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
133 /* GNU extension to record C++ vtable hierarchy. */
134 HOWTO (R_386_GNU_VTINHERIT
, /* type */
136 2, /* size (0 = byte, 1 = short, 2 = long) */
138 FALSE
, /* pc_relative */
140 complain_overflow_dont
, /* complain_on_overflow */
141 NULL
, /* special_function */
142 "R_386_GNU_VTINHERIT", /* name */
143 FALSE
, /* partial_inplace */
146 FALSE
), /* pcrel_offset */
148 /* GNU extension to record C++ vtable member usage. */
149 HOWTO (R_386_GNU_VTENTRY
, /* type */
151 2, /* size (0 = byte, 1 = short, 2 = long) */
153 FALSE
, /* pc_relative */
155 complain_overflow_dont
, /* complain_on_overflow */
156 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
157 "R_386_GNU_VTENTRY", /* name */
158 FALSE
, /* partial_inplace */
161 FALSE
) /* pcrel_offset */
163 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
167 #ifdef DEBUG_GEN_RELOC
169 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
174 static reloc_howto_type
*
175 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
176 bfd_reloc_code_real_type code
)
181 TRACE ("BFD_RELOC_NONE");
182 return &elf_howto_table
[R_386_NONE
];
185 TRACE ("BFD_RELOC_32");
186 return &elf_howto_table
[R_386_32
];
189 TRACE ("BFD_RELOC_CTOR");
190 return &elf_howto_table
[R_386_32
];
192 case BFD_RELOC_32_PCREL
:
193 TRACE ("BFD_RELOC_PC32");
194 return &elf_howto_table
[R_386_PC32
];
196 case BFD_RELOC_386_GOT32
:
197 TRACE ("BFD_RELOC_386_GOT32");
198 return &elf_howto_table
[R_386_GOT32
];
200 case BFD_RELOC_386_PLT32
:
201 TRACE ("BFD_RELOC_386_PLT32");
202 return &elf_howto_table
[R_386_PLT32
];
204 case BFD_RELOC_386_COPY
:
205 TRACE ("BFD_RELOC_386_COPY");
206 return &elf_howto_table
[R_386_COPY
];
208 case BFD_RELOC_386_GLOB_DAT
:
209 TRACE ("BFD_RELOC_386_GLOB_DAT");
210 return &elf_howto_table
[R_386_GLOB_DAT
];
212 case BFD_RELOC_386_JUMP_SLOT
:
213 TRACE ("BFD_RELOC_386_JUMP_SLOT");
214 return &elf_howto_table
[R_386_JUMP_SLOT
];
216 case BFD_RELOC_386_RELATIVE
:
217 TRACE ("BFD_RELOC_386_RELATIVE");
218 return &elf_howto_table
[R_386_RELATIVE
];
220 case BFD_RELOC_386_GOTOFF
:
221 TRACE ("BFD_RELOC_386_GOTOFF");
222 return &elf_howto_table
[R_386_GOTOFF
];
224 case BFD_RELOC_386_GOTPC
:
225 TRACE ("BFD_RELOC_386_GOTPC");
226 return &elf_howto_table
[R_386_GOTPC
];
228 /* These relocs are a GNU extension. */
229 case BFD_RELOC_386_TLS_TPOFF
:
230 TRACE ("BFD_RELOC_386_TLS_TPOFF");
231 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
233 case BFD_RELOC_386_TLS_IE
:
234 TRACE ("BFD_RELOC_386_TLS_IE");
235 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
237 case BFD_RELOC_386_TLS_GOTIE
:
238 TRACE ("BFD_RELOC_386_TLS_GOTIE");
239 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
241 case BFD_RELOC_386_TLS_LE
:
242 TRACE ("BFD_RELOC_386_TLS_LE");
243 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
245 case BFD_RELOC_386_TLS_GD
:
246 TRACE ("BFD_RELOC_386_TLS_GD");
247 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
249 case BFD_RELOC_386_TLS_LDM
:
250 TRACE ("BFD_RELOC_386_TLS_LDM");
251 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
254 TRACE ("BFD_RELOC_16");
255 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
257 case BFD_RELOC_16_PCREL
:
258 TRACE ("BFD_RELOC_16_PCREL");
259 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
262 TRACE ("BFD_RELOC_8");
263 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
265 case BFD_RELOC_8_PCREL
:
266 TRACE ("BFD_RELOC_8_PCREL");
267 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
269 /* Common with Sun TLS implementation. */
270 case BFD_RELOC_386_TLS_LDO_32
:
271 TRACE ("BFD_RELOC_386_TLS_LDO_32");
272 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
274 case BFD_RELOC_386_TLS_IE_32
:
275 TRACE ("BFD_RELOC_386_TLS_IE_32");
276 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
278 case BFD_RELOC_386_TLS_LE_32
:
279 TRACE ("BFD_RELOC_386_TLS_LE_32");
280 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
282 case BFD_RELOC_386_TLS_DTPMOD32
:
283 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
284 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
286 case BFD_RELOC_386_TLS_DTPOFF32
:
287 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
288 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
290 case BFD_RELOC_386_TLS_TPOFF32
:
291 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
292 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
294 case BFD_RELOC_VTABLE_INHERIT
:
295 TRACE ("BFD_RELOC_VTABLE_INHERIT");
296 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
298 case BFD_RELOC_VTABLE_ENTRY
:
299 TRACE ("BFD_RELOC_VTABLE_ENTRY");
300 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
311 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
313 Elf_Internal_Rela
*dst
)
315 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
318 if ((indx
= r_type
) >= R_386_standard
319 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
320 >= R_386_ext
- R_386_standard
)
321 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
322 >= R_386_tls
- R_386_ext
)
323 && ((indx
= r_type
- R_386_vt_offset
) - R_386_tls
324 >= R_386_vt
- R_386_tls
))
326 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
330 cache_ptr
->howto
= &elf_howto_table
[indx
];
333 /* Return whether a symbol name implies a local label. The UnixWare
334 2.1 cc generates temporary symbols that start with .X, so we
335 recognize them here. FIXME: do other SVR4 compilers also use .X?.
336 If so, we should move the .X recognition into
337 _bfd_elf_is_local_label_name. */
340 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
342 if (name
[0] == '.' && name
[1] == 'X')
345 return _bfd_elf_is_local_label_name (abfd
, name
);
348 /* Support for core dump NOTE sections. */
351 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
356 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
358 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
364 elf_tdata (abfd
)->core_signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
367 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
371 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
375 switch (note
->descsz
)
380 case 144: /* Linux/i386 */
382 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
385 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
397 size
, note
->descpos
+ offset
);
401 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
403 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
405 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
410 elf_tdata (abfd
)->core_program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
412 elf_tdata (abfd
)->core_command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
417 switch (note
->descsz
)
422 case 124: /* Linux/i386 elf_prpsinfo. */
423 elf_tdata (abfd
)->core_program
424 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
425 elf_tdata (abfd
)->core_command
426 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
430 /* Note that for some reason, a spurious space is tacked
431 onto the end of the args in some (at least one anyway)
432 implementations, so strip it off if it exists. */
434 char *command
= elf_tdata (abfd
)->core_command
;
435 int n
= strlen (command
);
437 if (0 < n
&& command
[n
- 1] == ' ')
438 command
[n
- 1] = '\0';
444 /* Functions for the i386 ELF linker.
446 In order to gain some understanding of code in this file without
447 knowing all the intricate details of the linker, note the
450 Functions named elf_i386_* are called by external routines, other
451 functions are only called locally. elf_i386_* functions appear
452 in this file more or less in the order in which they are called
453 from external routines. eg. elf_i386_check_relocs is called
454 early in the link process, elf_i386_finish_dynamic_sections is
455 one of the last functions. */
458 /* The name of the dynamic interpreter. This is put in the .interp
461 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
463 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
464 copying dynamic variables from a shared lib into an app's dynbss
465 section, and instead use a dynamic relocation to point into the
467 #define ELIMINATE_COPY_RELOCS 1
469 /* The size in bytes of an entry in the procedure linkage table. */
471 #define PLT_ENTRY_SIZE 16
473 /* The first entry in an absolute procedure linkage table looks like
474 this. See the SVR4 ABI i386 supplement to see how this works. */
476 static const bfd_byte elf_i386_plt0_entry
[PLT_ENTRY_SIZE
] =
478 0xff, 0x35, /* pushl contents of address */
479 0, 0, 0, 0, /* replaced with address of .got + 4. */
480 0xff, 0x25, /* jmp indirect */
481 0, 0, 0, 0, /* replaced with address of .got + 8. */
482 0, 0, 0, 0 /* pad out to 16 bytes. */
485 /* Subsequent entries in an absolute procedure linkage table look like
488 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
490 0xff, 0x25, /* jmp indirect */
491 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
492 0x68, /* pushl immediate */
493 0, 0, 0, 0, /* replaced with offset into relocation table. */
494 0xe9, /* jmp relative */
495 0, 0, 0, 0 /* replaced with offset to start of .plt. */
498 /* The first entry in a PIC procedure linkage table look like this. */
500 static const bfd_byte elf_i386_pic_plt0_entry
[PLT_ENTRY_SIZE
] =
502 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
503 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
504 0, 0, 0, 0 /* pad out to 16 bytes. */
507 /* Subsequent entries in a PIC procedure linkage table look like this. */
509 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
511 0xff, 0xa3, /* jmp *offset(%ebx) */
512 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
513 0x68, /* pushl immediate */
514 0, 0, 0, 0, /* replaced with offset into relocation table. */
515 0xe9, /* jmp relative */
516 0, 0, 0, 0 /* replaced with offset to start of .plt. */
519 /* The i386 linker needs to keep track of the number of relocs that it
520 decides to copy as dynamic relocs in check_relocs for each symbol.
521 This is so that it can later discard them if they are found to be
522 unnecessary. We store the information in a field extending the
523 regular ELF linker hash table. */
525 struct elf_i386_dyn_relocs
527 struct elf_i386_dyn_relocs
*next
;
529 /* The input section of the reloc. */
532 /* Total number of relocs copied for the input section. */
535 /* Number of pc-relative relocs copied for the input section. */
536 bfd_size_type pc_count
;
539 /* i386 ELF linker hash entry. */
541 struct elf_i386_link_hash_entry
543 struct elf_link_hash_entry elf
;
545 /* Track dynamic relocs copied for this symbol. */
546 struct elf_i386_dyn_relocs
*dyn_relocs
;
548 #define GOT_UNKNOWN 0
552 #define GOT_TLS_IE_POS 5
553 #define GOT_TLS_IE_NEG 6
554 #define GOT_TLS_IE_BOTH 7
555 unsigned char tls_type
;
558 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
560 struct elf_i386_obj_tdata
562 struct elf_obj_tdata root
;
564 /* tls_type for each local got entry. */
565 char *local_got_tls_type
;
568 #define elf_i386_tdata(abfd) \
569 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
571 #define elf_i386_local_got_tls_type(abfd) \
572 (elf_i386_tdata (abfd)->local_got_tls_type)
575 elf_i386_mkobject (bfd
*abfd
)
577 bfd_size_type amt
= sizeof (struct elf_i386_obj_tdata
);
578 abfd
->tdata
.any
= bfd_zalloc (abfd
, amt
);
579 if (abfd
->tdata
.any
== NULL
)
584 /* i386 ELF linker hash table. */
586 struct elf_i386_link_hash_table
588 struct elf_link_hash_table elf
;
590 /* Short-cuts to get to dynamic linker sections. */
600 bfd_signed_vma refcount
;
604 /* Small local sym to section mapping cache. */
605 struct sym_sec_cache sym_sec
;
608 /* Get the i386 ELF linker hash table from a link_info structure. */
610 #define elf_i386_hash_table(p) \
611 ((struct elf_i386_link_hash_table *) ((p)->hash))
613 /* Create an entry in an i386 ELF linker hash table. */
615 static struct bfd_hash_entry
*
616 link_hash_newfunc (struct bfd_hash_entry
*entry
,
617 struct bfd_hash_table
*table
,
620 /* Allocate the structure if it has not already been allocated by a
624 entry
= bfd_hash_allocate (table
,
625 sizeof (struct elf_i386_link_hash_entry
));
630 /* Call the allocation method of the superclass. */
631 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
634 struct elf_i386_link_hash_entry
*eh
;
636 eh
= (struct elf_i386_link_hash_entry
*) entry
;
637 eh
->dyn_relocs
= NULL
;
638 eh
->tls_type
= GOT_UNKNOWN
;
644 /* Create an i386 ELF linker hash table. */
646 static struct bfd_link_hash_table
*
647 elf_i386_link_hash_table_create (bfd
*abfd
)
649 struct elf_i386_link_hash_table
*ret
;
650 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
652 ret
= bfd_malloc (amt
);
656 if (! _bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
))
669 ret
->tls_ldm_got
.refcount
= 0;
670 ret
->sym_sec
.abfd
= NULL
;
672 return &ret
->elf
.root
;
675 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
676 shortcuts to them in our hash table. */
679 create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
681 struct elf_i386_link_hash_table
*htab
;
683 if (! _bfd_elf_create_got_section (dynobj
, info
))
686 htab
= elf_i386_hash_table (info
);
687 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
688 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
689 if (!htab
->sgot
|| !htab
->sgotplt
)
692 htab
->srelgot
= bfd_make_section (dynobj
, ".rel.got");
693 if (htab
->srelgot
== NULL
694 || ! bfd_set_section_flags (dynobj
, htab
->srelgot
,
695 (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
696 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
698 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
703 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
704 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
708 elf_i386_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
710 struct elf_i386_link_hash_table
*htab
;
712 htab
= elf_i386_hash_table (info
);
713 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
716 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
719 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
720 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
721 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
723 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
725 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
726 || (!info
->shared
&& !htab
->srelbss
))
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
735 elf_i386_copy_indirect_symbol (const struct elf_backend_data
*bed
,
736 struct elf_link_hash_entry
*dir
,
737 struct elf_link_hash_entry
*ind
)
739 struct elf_i386_link_hash_entry
*edir
, *eind
;
741 edir
= (struct elf_i386_link_hash_entry
*) dir
;
742 eind
= (struct elf_i386_link_hash_entry
*) ind
;
744 if (eind
->dyn_relocs
!= NULL
)
746 if (edir
->dyn_relocs
!= NULL
)
748 struct elf_i386_dyn_relocs
**pp
;
749 struct elf_i386_dyn_relocs
*p
;
751 if (ind
->root
.type
== bfd_link_hash_indirect
)
754 /* Add reloc counts against the weak sym to the strong sym
755 list. Merge any entries against the same section. */
756 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
758 struct elf_i386_dyn_relocs
*q
;
760 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
761 if (q
->sec
== p
->sec
)
763 q
->pc_count
+= p
->pc_count
;
764 q
->count
+= p
->count
;
771 *pp
= edir
->dyn_relocs
;
774 edir
->dyn_relocs
= eind
->dyn_relocs
;
775 eind
->dyn_relocs
= NULL
;
778 if (ind
->root
.type
== bfd_link_hash_indirect
779 && dir
->got
.refcount
<= 0)
781 edir
->tls_type
= eind
->tls_type
;
782 eind
->tls_type
= GOT_UNKNOWN
;
785 if (ELIMINATE_COPY_RELOCS
786 && ind
->root
.type
!= bfd_link_hash_indirect
787 && dir
->dynamic_adjusted
)
789 /* If called to transfer flags for a weakdef during processing
790 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
791 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
792 dir
->ref_dynamic
|= ind
->ref_dynamic
;
793 dir
->ref_regular
|= ind
->ref_regular
;
794 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
795 dir
->needs_plt
|= ind
->needs_plt
;
796 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
799 _bfd_elf_link_hash_copy_indirect (bed
, dir
, ind
);
803 elf_i386_tls_transition (struct bfd_link_info
*info
, int r_type
, int is_local
)
811 case R_386_TLS_IE_32
:
813 return R_386_TLS_LE_32
;
814 return R_386_TLS_IE_32
;
816 case R_386_TLS_GOTIE
:
818 return R_386_TLS_LE_32
;
821 return R_386_TLS_LE_32
;
827 /* Look through the relocs for a section during the first phase, and
828 calculate needed space in the global offset table, procedure linkage
829 table, and dynamic reloc sections. */
832 elf_i386_check_relocs (bfd
*abfd
,
833 struct bfd_link_info
*info
,
835 const Elf_Internal_Rela
*relocs
)
837 struct elf_i386_link_hash_table
*htab
;
838 Elf_Internal_Shdr
*symtab_hdr
;
839 struct elf_link_hash_entry
**sym_hashes
;
840 const Elf_Internal_Rela
*rel
;
841 const Elf_Internal_Rela
*rel_end
;
844 if (info
->relocatable
)
847 htab
= elf_i386_hash_table (info
);
848 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
849 sym_hashes
= elf_sym_hashes (abfd
);
853 rel_end
= relocs
+ sec
->reloc_count
;
854 for (rel
= relocs
; rel
< rel_end
; rel
++)
857 unsigned long r_symndx
;
858 struct elf_link_hash_entry
*h
;
860 r_symndx
= ELF32_R_SYM (rel
->r_info
);
861 r_type
= ELF32_R_TYPE (rel
->r_info
);
863 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
865 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
871 if (r_symndx
< symtab_hdr
->sh_info
)
874 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
876 r_type
= elf_i386_tls_transition (info
, r_type
, h
== NULL
);
881 htab
->tls_ldm_got
.refcount
+= 1;
885 /* This symbol requires a procedure linkage table entry. We
886 actually build the entry in adjust_dynamic_symbol,
887 because this might be a case of linking PIC code which is
888 never referenced by a dynamic object, in which case we
889 don't need to generate a procedure linkage table entry
892 /* If this is a local symbol, we resolve it directly without
893 creating a procedure linkage table entry. */
898 h
->plt
.refcount
+= 1;
901 case R_386_TLS_IE_32
:
903 case R_386_TLS_GOTIE
:
905 info
->flags
|= DF_STATIC_TLS
;
910 /* This symbol requires a global offset table entry. */
912 int tls_type
, old_tls_type
;
917 case R_386_GOT32
: tls_type
= GOT_NORMAL
; break;
918 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
919 case R_386_TLS_IE_32
:
920 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
921 tls_type
= GOT_TLS_IE_NEG
;
923 /* If this is a GD->IE transition, we may use either of
924 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
925 tls_type
= GOT_TLS_IE
;
928 case R_386_TLS_GOTIE
:
929 tls_type
= GOT_TLS_IE_POS
; break;
934 h
->got
.refcount
+= 1;
935 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
939 bfd_signed_vma
*local_got_refcounts
;
941 /* This is a global offset table entry for a local symbol. */
942 local_got_refcounts
= elf_local_got_refcounts (abfd
);
943 if (local_got_refcounts
== NULL
)
947 size
= symtab_hdr
->sh_info
;
948 size
*= (sizeof (bfd_signed_vma
) + sizeof(char));
949 local_got_refcounts
= bfd_zalloc (abfd
, size
);
950 if (local_got_refcounts
== NULL
)
952 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
953 elf_i386_local_got_tls_type (abfd
)
954 = (char *) (local_got_refcounts
+ symtab_hdr
->sh_info
);
956 local_got_refcounts
[r_symndx
] += 1;
957 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
960 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
961 tls_type
|= old_tls_type
;
962 /* If a TLS symbol is accessed using IE at least once,
963 there is no point to use dynamic model for it. */
964 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
965 && (old_tls_type
!= GOT_TLS_GD
966 || (tls_type
& GOT_TLS_IE
) == 0))
968 if ((old_tls_type
& GOT_TLS_IE
) && tls_type
== GOT_TLS_GD
)
969 tls_type
= old_tls_type
;
972 (*_bfd_error_handler
)
973 (_("%B: `%s' accessed both as normal and "
974 "thread local symbol"),
976 h
? h
->root
.root
.string
: "<local>");
981 if (old_tls_type
!= tls_type
)
984 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
986 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
994 if (htab
->sgot
== NULL
)
996 if (htab
->elf
.dynobj
== NULL
)
997 htab
->elf
.dynobj
= abfd
;
998 if (!create_got_section (htab
->elf
.dynobj
, info
))
1001 if (r_type
!= R_386_TLS_IE
)
1005 case R_386_TLS_LE_32
:
1009 info
->flags
|= DF_STATIC_TLS
;
1014 if (h
!= NULL
&& !info
->shared
)
1016 /* If this reloc is in a read-only section, we might
1017 need a copy reloc. We can't check reliably at this
1018 stage whether the section is read-only, as input
1019 sections have not yet been mapped to output sections.
1020 Tentatively set the flag for now, and correct in
1021 adjust_dynamic_symbol. */
1024 /* We may need a .plt entry if the function this reloc
1025 refers to is in a shared lib. */
1026 h
->plt
.refcount
+= 1;
1027 if (r_type
!= R_386_PC32
)
1028 h
->pointer_equality_needed
= 1;
1031 /* If we are creating a shared library, and this is a reloc
1032 against a global symbol, or a non PC relative reloc
1033 against a local symbol, then we need to copy the reloc
1034 into the shared library. However, if we are linking with
1035 -Bsymbolic, we do not need to copy a reloc against a
1036 global symbol which is defined in an object we are
1037 including in the link (i.e., DEF_REGULAR is set). At
1038 this point we have not seen all the input files, so it is
1039 possible that DEF_REGULAR is not set now but will be set
1040 later (it is never cleared). In case of a weak definition,
1041 DEF_REGULAR may be cleared later by a strong definition in
1042 a shared library. We account for that possibility below by
1043 storing information in the relocs_copied field of the hash
1044 table entry. A similar situation occurs when creating
1045 shared libraries and symbol visibility changes render the
1048 If on the other hand, we are creating an executable, we
1049 may need to keep relocations for symbols satisfied by a
1050 dynamic library if we manage to avoid copy relocs for the
1053 && (sec
->flags
& SEC_ALLOC
) != 0
1054 && (r_type
!= R_386_PC32
1056 && (! info
->symbolic
1057 || h
->root
.type
== bfd_link_hash_defweak
1058 || !h
->def_regular
))))
1059 || (ELIMINATE_COPY_RELOCS
1061 && (sec
->flags
& SEC_ALLOC
) != 0
1063 && (h
->root
.type
== bfd_link_hash_defweak
1064 || !h
->def_regular
)))
1066 struct elf_i386_dyn_relocs
*p
;
1067 struct elf_i386_dyn_relocs
**head
;
1069 /* We must copy these reloc types into the output file.
1070 Create a reloc section in dynobj and make room for
1076 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
1077 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
1079 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
1083 if (strncmp (name
, ".rel", 4) != 0
1084 || strcmp (bfd_get_section_name (abfd
, sec
),
1087 (*_bfd_error_handler
)
1088 (_("%B: bad relocation section name `%s\'"),
1092 if (htab
->elf
.dynobj
== NULL
)
1093 htab
->elf
.dynobj
= abfd
;
1095 dynobj
= htab
->elf
.dynobj
;
1096 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1101 sreloc
= bfd_make_section (dynobj
, name
);
1102 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
1103 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1104 if ((sec
->flags
& SEC_ALLOC
) != 0)
1105 flags
|= SEC_ALLOC
| SEC_LOAD
;
1107 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
1108 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
1111 elf_section_data (sec
)->sreloc
= sreloc
;
1114 /* If this is a global symbol, we count the number of
1115 relocations we need for this symbol. */
1118 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1122 /* Track dynamic relocs needed for local syms too.
1123 We really need local syms available to do this
1127 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1132 head
= ((struct elf_i386_dyn_relocs
**)
1133 &elf_section_data (s
)->local_dynrel
);
1137 if (p
== NULL
|| p
->sec
!= sec
)
1139 bfd_size_type amt
= sizeof *p
;
1140 p
= bfd_alloc (htab
->elf
.dynobj
, amt
);
1151 if (r_type
== R_386_PC32
)
1156 /* This relocation describes the C++ object vtable hierarchy.
1157 Reconstruct it for later use during GC. */
1158 case R_386_GNU_VTINHERIT
:
1159 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1163 /* This relocation describes which C++ vtable entries are actually
1164 used. Record for later use during GC. */
1165 case R_386_GNU_VTENTRY
:
1166 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1178 /* Return the section that should be marked against GC for a given
1182 elf_i386_gc_mark_hook (asection
*sec
,
1183 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1184 Elf_Internal_Rela
*rel
,
1185 struct elf_link_hash_entry
*h
,
1186 Elf_Internal_Sym
*sym
)
1190 switch (ELF32_R_TYPE (rel
->r_info
))
1192 case R_386_GNU_VTINHERIT
:
1193 case R_386_GNU_VTENTRY
:
1197 switch (h
->root
.type
)
1199 case bfd_link_hash_defined
:
1200 case bfd_link_hash_defweak
:
1201 return h
->root
.u
.def
.section
;
1203 case bfd_link_hash_common
:
1204 return h
->root
.u
.c
.p
->section
;
1212 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
1217 /* Update the got entry reference counts for the section being removed. */
1220 elf_i386_gc_sweep_hook (bfd
*abfd
,
1221 struct bfd_link_info
*info
,
1223 const Elf_Internal_Rela
*relocs
)
1225 Elf_Internal_Shdr
*symtab_hdr
;
1226 struct elf_link_hash_entry
**sym_hashes
;
1227 bfd_signed_vma
*local_got_refcounts
;
1228 const Elf_Internal_Rela
*rel
, *relend
;
1230 elf_section_data (sec
)->local_dynrel
= NULL
;
1232 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1233 sym_hashes
= elf_sym_hashes (abfd
);
1234 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1236 relend
= relocs
+ sec
->reloc_count
;
1237 for (rel
= relocs
; rel
< relend
; rel
++)
1239 unsigned long r_symndx
;
1240 unsigned int r_type
;
1241 struct elf_link_hash_entry
*h
= NULL
;
1243 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1244 if (r_symndx
>= symtab_hdr
->sh_info
)
1246 struct elf_i386_link_hash_entry
*eh
;
1247 struct elf_i386_dyn_relocs
**pp
;
1248 struct elf_i386_dyn_relocs
*p
;
1250 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1251 while (h
->root
.type
== bfd_link_hash_indirect
1252 || h
->root
.type
== bfd_link_hash_warning
)
1253 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1254 eh
= (struct elf_i386_link_hash_entry
*) h
;
1256 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1259 /* Everything must go for SEC. */
1265 r_type
= ELF32_R_TYPE (rel
->r_info
);
1266 r_type
= elf_i386_tls_transition (info
, r_type
, h
!= NULL
);
1270 if (elf_i386_hash_table (info
)->tls_ldm_got
.refcount
> 0)
1271 elf_i386_hash_table (info
)->tls_ldm_got
.refcount
-= 1;
1275 case R_386_TLS_IE_32
:
1277 case R_386_TLS_GOTIE
:
1281 if (h
->got
.refcount
> 0)
1282 h
->got
.refcount
-= 1;
1284 else if (local_got_refcounts
!= NULL
)
1286 if (local_got_refcounts
[r_symndx
] > 0)
1287 local_got_refcounts
[r_symndx
] -= 1;
1300 if (h
->plt
.refcount
> 0)
1301 h
->plt
.refcount
-= 1;
1313 /* Adjust a symbol defined by a dynamic object and referenced by a
1314 regular object. The current definition is in some section of the
1315 dynamic object, but we're not including those sections. We have to
1316 change the definition to something the rest of the link can
1320 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1321 struct elf_link_hash_entry
*h
)
1323 struct elf_i386_link_hash_table
*htab
;
1325 unsigned int power_of_two
;
1327 /* If this is a function, put it in the procedure linkage table. We
1328 will fill in the contents of the procedure linkage table later,
1329 when we know the address of the .got section. */
1330 if (h
->type
== STT_FUNC
1333 if (h
->plt
.refcount
<= 0
1334 || SYMBOL_CALLS_LOCAL (info
, h
)
1335 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1336 && h
->root
.type
== bfd_link_hash_undefweak
))
1338 /* This case can occur if we saw a PLT32 reloc in an input
1339 file, but the symbol was never referred to by a dynamic
1340 object, or if all references were garbage collected. In
1341 such a case, we don't actually need to build a procedure
1342 linkage table, and we can just do a PC32 reloc instead. */
1343 h
->plt
.offset
= (bfd_vma
) -1;
1350 /* It's possible that we incorrectly decided a .plt reloc was
1351 needed for an R_386_PC32 reloc to a non-function sym in
1352 check_relocs. We can't decide accurately between function and
1353 non-function syms in check-relocs; Objects loaded later in
1354 the link may change h->type. So fix it now. */
1355 h
->plt
.offset
= (bfd_vma
) -1;
1357 /* If this is a weak symbol, and there is a real definition, the
1358 processor independent code will have arranged for us to see the
1359 real definition first, and we can just use the same value. */
1360 if (h
->u
.weakdef
!= NULL
)
1362 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1363 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1364 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1365 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1366 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1367 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1371 /* This is a reference to a symbol defined by a dynamic object which
1372 is not a function. */
1374 /* If we are creating a shared library, we must presume that the
1375 only references to the symbol are via the global offset table.
1376 For such cases we need not do anything here; the relocations will
1377 be handled correctly by relocate_section. */
1381 /* If there are no references to this symbol that do not use the
1382 GOT, we don't need to generate a copy reloc. */
1383 if (!h
->non_got_ref
)
1386 /* If -z nocopyreloc was given, we won't generate them either. */
1387 if (info
->nocopyreloc
)
1393 if (ELIMINATE_COPY_RELOCS
)
1395 struct elf_i386_link_hash_entry
* eh
;
1396 struct elf_i386_dyn_relocs
*p
;
1398 eh
= (struct elf_i386_link_hash_entry
*) h
;
1399 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1401 s
= p
->sec
->output_section
;
1402 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1406 /* If we didn't find any dynamic relocs in read-only sections, then
1407 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1415 /* We must allocate the symbol in our .dynbss section, which will
1416 become part of the .bss section of the executable. There will be
1417 an entry for this symbol in the .dynsym section. The dynamic
1418 object will contain position independent code, so all references
1419 from the dynamic object to this symbol will go through the global
1420 offset table. The dynamic linker will use the .dynsym entry to
1421 determine the address it must put in the global offset table, so
1422 both the dynamic object and the regular object will refer to the
1423 same memory location for the variable. */
1425 htab
= elf_i386_hash_table (info
);
1427 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1428 copy the initial value out of the dynamic object and into the
1429 runtime process image. */
1430 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1432 htab
->srelbss
->size
+= sizeof (Elf32_External_Rel
);
1436 /* We need to figure out the alignment required for this symbol. I
1437 have no idea how ELF linkers handle this. */
1438 power_of_two
= bfd_log2 (h
->size
);
1439 if (power_of_two
> 3)
1442 /* Apply the required alignment. */
1444 s
->size
= BFD_ALIGN (s
->size
, (bfd_size_type
) (1 << power_of_two
));
1445 if (power_of_two
> bfd_get_section_alignment (htab
->elf
.dynobj
, s
))
1447 if (! bfd_set_section_alignment (htab
->elf
.dynobj
, s
, power_of_two
))
1451 /* Define the symbol as being at this point in the section. */
1452 h
->root
.u
.def
.section
= s
;
1453 h
->root
.u
.def
.value
= s
->size
;
1455 /* Increment the section size to make room for the symbol. */
1461 /* Allocate space in .plt, .got and associated reloc sections for
1465 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
1467 struct bfd_link_info
*info
;
1468 struct elf_i386_link_hash_table
*htab
;
1469 struct elf_i386_link_hash_entry
*eh
;
1470 struct elf_i386_dyn_relocs
*p
;
1472 if (h
->root
.type
== bfd_link_hash_indirect
)
1475 if (h
->root
.type
== bfd_link_hash_warning
)
1476 /* When warning symbols are created, they **replace** the "real"
1477 entry in the hash table, thus we never get to see the real
1478 symbol in a hash traversal. So look at it now. */
1479 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1481 info
= (struct bfd_link_info
*) inf
;
1482 htab
= elf_i386_hash_table (info
);
1484 if (htab
->elf
.dynamic_sections_created
1485 && h
->plt
.refcount
> 0)
1487 /* Make sure this symbol is output as a dynamic symbol.
1488 Undefined weak syms won't yet be marked as dynamic. */
1489 if (h
->dynindx
== -1
1490 && !h
->forced_local
)
1492 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1497 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1499 asection
*s
= htab
->splt
;
1501 /* If this is the first .plt entry, make room for the special
1504 s
->size
+= PLT_ENTRY_SIZE
;
1506 h
->plt
.offset
= s
->size
;
1508 /* If this symbol is not defined in a regular file, and we are
1509 not generating a shared library, then set the symbol to this
1510 location in the .plt. This is required to make function
1511 pointers compare as equal between the normal executable and
1512 the shared library. */
1516 h
->root
.u
.def
.section
= s
;
1517 h
->root
.u
.def
.value
= h
->plt
.offset
;
1520 /* Make room for this entry. */
1521 s
->size
+= PLT_ENTRY_SIZE
;
1523 /* We also need to make an entry in the .got.plt section, which
1524 will be placed in the .got section by the linker script. */
1525 htab
->sgotplt
->size
+= 4;
1527 /* We also need to make an entry in the .rel.plt section. */
1528 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
1532 h
->plt
.offset
= (bfd_vma
) -1;
1538 h
->plt
.offset
= (bfd_vma
) -1;
1542 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1543 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1544 if (h
->got
.refcount
> 0
1547 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
1548 h
->got
.offset
= (bfd_vma
) -1;
1549 else if (h
->got
.refcount
> 0)
1553 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1555 /* Make sure this symbol is output as a dynamic symbol.
1556 Undefined weak syms won't yet be marked as dynamic. */
1557 if (h
->dynindx
== -1
1558 && !h
->forced_local
)
1560 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1565 h
->got
.offset
= s
->size
;
1567 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1568 if (tls_type
== GOT_TLS_GD
|| tls_type
== GOT_TLS_IE_BOTH
)
1570 dyn
= htab
->elf
.dynamic_sections_created
;
1571 /* R_386_TLS_IE_32 needs one dynamic relocation,
1572 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1573 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1574 need two), R_386_TLS_GD needs one if local symbol and two if
1576 if (tls_type
== GOT_TLS_IE_BOTH
)
1577 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
1578 else if ((tls_type
== GOT_TLS_GD
&& h
->dynindx
== -1)
1579 || (tls_type
& GOT_TLS_IE
))
1580 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
1581 else if (tls_type
== GOT_TLS_GD
)
1582 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
1583 else if ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1584 || h
->root
.type
!= bfd_link_hash_undefweak
)
1586 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1587 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
1590 h
->got
.offset
= (bfd_vma
) -1;
1592 eh
= (struct elf_i386_link_hash_entry
*) h
;
1593 if (eh
->dyn_relocs
== NULL
)
1596 /* In the shared -Bsymbolic case, discard space allocated for
1597 dynamic pc-relative relocs against symbols which turn out to be
1598 defined in regular objects. For the normal shared case, discard
1599 space for pc-relative relocs that have become local due to symbol
1600 visibility changes. */
1604 /* The only reloc that uses pc_count is R_386_PC32, which will
1605 appear on a call or on something like ".long foo - .". We
1606 want calls to protected symbols to resolve directly to the
1607 function rather than going via the plt. If people want
1608 function pointer comparisons to work as expected then they
1609 should avoid writing assembly like ".long foo - .". */
1610 if (SYMBOL_CALLS_LOCAL (info
, h
))
1612 struct elf_i386_dyn_relocs
**pp
;
1614 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1616 p
->count
-= p
->pc_count
;
1625 /* Also discard relocs on undefined weak syms with non-default
1627 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1628 && h
->root
.type
== bfd_link_hash_undefweak
)
1629 eh
->dyn_relocs
= NULL
;
1631 else if (ELIMINATE_COPY_RELOCS
)
1633 /* For the non-shared case, discard space for relocs against
1634 symbols which turn out to need copy relocs or are not
1640 || (htab
->elf
.dynamic_sections_created
1641 && (h
->root
.type
== bfd_link_hash_undefweak
1642 || h
->root
.type
== bfd_link_hash_undefined
))))
1644 /* Make sure this symbol is output as a dynamic symbol.
1645 Undefined weak syms won't yet be marked as dynamic. */
1646 if (h
->dynindx
== -1
1647 && !h
->forced_local
)
1649 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1653 /* If that succeeded, we know we'll be keeping all the
1655 if (h
->dynindx
!= -1)
1659 eh
->dyn_relocs
= NULL
;
1664 /* Finally, allocate space. */
1665 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1667 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1668 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
1674 /* Find any dynamic relocs that apply to read-only sections. */
1677 readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
1679 struct elf_i386_link_hash_entry
*eh
;
1680 struct elf_i386_dyn_relocs
*p
;
1682 if (h
->root
.type
== bfd_link_hash_warning
)
1683 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1685 eh
= (struct elf_i386_link_hash_entry
*) h
;
1686 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1688 asection
*s
= p
->sec
->output_section
;
1690 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1692 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1694 info
->flags
|= DF_TEXTREL
;
1696 /* Not an error, just cut short the traversal. */
1703 /* Set the sizes of the dynamic sections. */
1706 elf_i386_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1707 struct bfd_link_info
*info
)
1709 struct elf_i386_link_hash_table
*htab
;
1715 htab
= elf_i386_hash_table (info
);
1716 dynobj
= htab
->elf
.dynobj
;
1720 if (htab
->elf
.dynamic_sections_created
)
1722 /* Set the contents of the .interp section to the interpreter. */
1723 if (info
->executable
)
1725 s
= bfd_get_section_by_name (dynobj
, ".interp");
1728 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1729 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1733 /* Set up .got offsets for local syms, and space for local dynamic
1735 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1737 bfd_signed_vma
*local_got
;
1738 bfd_signed_vma
*end_local_got
;
1739 char *local_tls_type
;
1740 bfd_size_type locsymcount
;
1741 Elf_Internal_Shdr
*symtab_hdr
;
1744 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
1747 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1749 struct elf_i386_dyn_relocs
*p
;
1751 for (p
= *((struct elf_i386_dyn_relocs
**)
1752 &elf_section_data (s
)->local_dynrel
);
1756 if (!bfd_is_abs_section (p
->sec
)
1757 && bfd_is_abs_section (p
->sec
->output_section
))
1759 /* Input section has been discarded, either because
1760 it is a copy of a linkonce section or due to
1761 linker script /DISCARD/, so we'll be discarding
1764 else if (p
->count
!= 0)
1766 srel
= elf_section_data (p
->sec
)->sreloc
;
1767 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
1768 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1769 info
->flags
|= DF_TEXTREL
;
1774 local_got
= elf_local_got_refcounts (ibfd
);
1778 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
1779 locsymcount
= symtab_hdr
->sh_info
;
1780 end_local_got
= local_got
+ locsymcount
;
1781 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
1783 srel
= htab
->srelgot
;
1784 for (; local_got
< end_local_got
; ++local_got
, ++local_tls_type
)
1788 *local_got
= s
->size
;
1790 if (*local_tls_type
== GOT_TLS_GD
1791 || *local_tls_type
== GOT_TLS_IE_BOTH
)
1794 || *local_tls_type
== GOT_TLS_GD
1795 || (*local_tls_type
& GOT_TLS_IE
))
1797 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
1798 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
1800 srel
->size
+= sizeof (Elf32_External_Rel
);
1804 *local_got
= (bfd_vma
) -1;
1808 if (htab
->tls_ldm_got
.refcount
> 0)
1810 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1812 htab
->tls_ldm_got
.offset
= htab
->sgot
->size
;
1813 htab
->sgot
->size
+= 8;
1814 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
1817 htab
->tls_ldm_got
.offset
= -1;
1819 /* Allocate global sym .plt and .got entries, and space for global
1820 sym dynamic relocs. */
1821 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, (PTR
) info
);
1823 /* We now have determined the sizes of the various dynamic sections.
1824 Allocate memory for them. */
1826 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1828 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1833 || s
== htab
->sgotplt
)
1835 /* Strip this section if we don't need it; see the
1838 else if (strncmp (bfd_get_section_name (dynobj
, s
), ".rel", 4) == 0)
1840 if (s
->size
!= 0 && s
!= htab
->srelplt
)
1843 /* We use the reloc_count field as a counter if we need
1844 to copy relocs into the output file. */
1849 /* It's not one of our sections, so don't allocate space. */
1855 /* If we don't need this section, strip it from the
1856 output file. This is mostly to handle .rel.bss and
1857 .rel.plt. We must create both sections in
1858 create_dynamic_sections, because they must be created
1859 before the linker maps input sections to output
1860 sections. The linker does that before
1861 adjust_dynamic_symbol is called, and it is that
1862 function which decides whether anything needs to go
1863 into these sections. */
1865 _bfd_strip_section_from_output (info
, s
);
1869 /* Allocate memory for the section contents. We use bfd_zalloc
1870 here in case unused entries are not reclaimed before the
1871 section's contents are written out. This should not happen,
1872 but this way if it does, we get a R_386_NONE reloc instead
1874 s
->contents
= bfd_zalloc (dynobj
, s
->size
);
1875 if (s
->contents
== NULL
)
1879 if (htab
->elf
.dynamic_sections_created
)
1881 /* Add some entries to the .dynamic section. We fill in the
1882 values later, in elf_i386_finish_dynamic_sections, but we
1883 must add the entries now so that we get the correct size for
1884 the .dynamic section. The DT_DEBUG entry is filled in by the
1885 dynamic linker and used by the debugger. */
1886 #define add_dynamic_entry(TAG, VAL) \
1887 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1889 if (info
->executable
)
1891 if (!add_dynamic_entry (DT_DEBUG
, 0))
1895 if (htab
->splt
->size
!= 0)
1897 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1898 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1899 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
1900 || !add_dynamic_entry (DT_JMPREL
, 0))
1906 if (!add_dynamic_entry (DT_REL
, 0)
1907 || !add_dynamic_entry (DT_RELSZ
, 0)
1908 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
1911 /* If any dynamic relocs apply to a read-only section,
1912 then we need a DT_TEXTREL entry. */
1913 if ((info
->flags
& DF_TEXTREL
) == 0)
1914 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
,
1917 if ((info
->flags
& DF_TEXTREL
) != 0)
1919 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1924 #undef add_dynamic_entry
1929 /* Set the correct type for an x86 ELF section. We do this by the
1930 section name, which is a hack, but ought to work. */
1933 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
1934 Elf_Internal_Shdr
*hdr
,
1937 register const char *name
;
1939 name
= bfd_get_section_name (abfd
, sec
);
1941 /* This is an ugly, but unfortunately necessary hack that is
1942 needed when producing EFI binaries on x86. It tells
1943 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1944 containing ELF relocation info. We need this hack in order to
1945 be able to generate ELF binaries that can be translated into
1946 EFI applications (which are essentially COFF objects). Those
1947 files contain a COFF ".reloc" section inside an ELFNN object,
1948 which would normally cause BFD to segfault because it would
1949 attempt to interpret this section as containing relocation
1950 entries for section "oc". With this hack enabled, ".reloc"
1951 will be treated as a normal data section, which will avoid the
1952 segfault. However, you won't be able to create an ELFNN binary
1953 with a section named "oc" that needs relocations, but that's
1954 the kind of ugly side-effects you get when detecting section
1955 types based on their names... In practice, this limitation is
1956 unlikely to bite. */
1957 if (strcmp (name
, ".reloc") == 0)
1958 hdr
->sh_type
= SHT_PROGBITS
;
1963 /* Return the base VMA address which should be subtracted from real addresses
1964 when resolving @dtpoff relocation.
1965 This is PT_TLS segment p_vaddr. */
1968 dtpoff_base (struct bfd_link_info
*info
)
1970 /* If tls_sec is NULL, we should have signalled an error already. */
1971 if (elf_hash_table (info
)->tls_sec
== NULL
)
1973 return elf_hash_table (info
)->tls_sec
->vma
;
1976 /* Return the relocation value for @tpoff relocation
1977 if STT_TLS virtual address is ADDRESS. */
1980 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
1982 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
1984 /* If tls_sec is NULL, we should have signalled an error already. */
1985 if (htab
->tls_sec
== NULL
)
1987 return htab
->tls_size
+ htab
->tls_sec
->vma
- address
;
1990 /* Relocate an i386 ELF section. */
1993 elf_i386_relocate_section (bfd
*output_bfd
,
1994 struct bfd_link_info
*info
,
1996 asection
*input_section
,
1998 Elf_Internal_Rela
*relocs
,
1999 Elf_Internal_Sym
*local_syms
,
2000 asection
**local_sections
)
2002 struct elf_i386_link_hash_table
*htab
;
2003 Elf_Internal_Shdr
*symtab_hdr
;
2004 struct elf_link_hash_entry
**sym_hashes
;
2005 bfd_vma
*local_got_offsets
;
2006 Elf_Internal_Rela
*rel
;
2007 Elf_Internal_Rela
*relend
;
2009 htab
= elf_i386_hash_table (info
);
2010 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2011 sym_hashes
= elf_sym_hashes (input_bfd
);
2012 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2015 relend
= relocs
+ input_section
->reloc_count
;
2016 for (; rel
< relend
; rel
++)
2018 unsigned int r_type
;
2019 reloc_howto_type
*howto
;
2020 unsigned long r_symndx
;
2021 struct elf_link_hash_entry
*h
;
2022 Elf_Internal_Sym
*sym
;
2026 bfd_boolean unresolved_reloc
;
2027 bfd_reloc_status_type r
;
2031 r_type
= ELF32_R_TYPE (rel
->r_info
);
2032 if (r_type
== R_386_GNU_VTINHERIT
2033 || r_type
== R_386_GNU_VTENTRY
)
2036 if ((indx
= r_type
) >= R_386_standard
2037 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
2038 >= R_386_ext
- R_386_standard
)
2039 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
2040 >= R_386_tls
- R_386_ext
))
2042 (*_bfd_error_handler
)
2043 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2044 input_bfd
, input_section
, r_type
);
2045 bfd_set_error (bfd_error_bad_value
);
2048 howto
= elf_howto_table
+ indx
;
2050 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2052 if (info
->relocatable
)
2057 /* This is a relocatable link. We don't have to change
2058 anything, unless the reloc is against a section symbol,
2059 in which case we have to adjust according to where the
2060 section symbol winds up in the output section. */
2061 if (r_symndx
>= symtab_hdr
->sh_info
)
2064 sym
= local_syms
+ r_symndx
;
2065 if (ELF_ST_TYPE (sym
->st_info
) != STT_SECTION
)
2068 sec
= local_sections
[r_symndx
];
2069 val
= sec
->output_offset
;
2073 where
= contents
+ rel
->r_offset
;
2074 switch (howto
->size
)
2076 /* FIXME: overflow checks. */
2078 val
+= bfd_get_8 (input_bfd
, where
);
2079 bfd_put_8 (input_bfd
, val
, where
);
2082 val
+= bfd_get_16 (input_bfd
, where
);
2083 bfd_put_16 (input_bfd
, val
, where
);
2086 val
+= bfd_get_32 (input_bfd
, where
);
2087 bfd_put_32 (input_bfd
, val
, where
);
2095 /* This is a final link. */
2099 unresolved_reloc
= FALSE
;
2100 if (r_symndx
< symtab_hdr
->sh_info
)
2102 sym
= local_syms
+ r_symndx
;
2103 sec
= local_sections
[r_symndx
];
2104 relocation
= (sec
->output_section
->vma
2105 + sec
->output_offset
2107 if ((sec
->flags
& SEC_MERGE
)
2108 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2112 bfd_byte
*where
= contents
+ rel
->r_offset
;
2114 switch (howto
->size
)
2117 addend
= bfd_get_8 (input_bfd
, where
);
2118 if (howto
->pc_relative
)
2120 addend
= (addend
^ 0x80) - 0x80;
2125 addend
= bfd_get_16 (input_bfd
, where
);
2126 if (howto
->pc_relative
)
2128 addend
= (addend
^ 0x8000) - 0x8000;
2133 addend
= bfd_get_32 (input_bfd
, where
);
2134 if (howto
->pc_relative
)
2136 addend
= (addend
^ 0x80000000) - 0x80000000;
2145 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
);
2146 addend
-= relocation
;
2147 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2149 switch (howto
->size
)
2152 /* FIXME: overflow checks. */
2153 if (howto
->pc_relative
)
2155 bfd_put_8 (input_bfd
, addend
, where
);
2158 if (howto
->pc_relative
)
2160 bfd_put_16 (input_bfd
, addend
, where
);
2163 if (howto
->pc_relative
)
2165 bfd_put_32 (input_bfd
, addend
, where
);
2174 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2175 r_symndx
, symtab_hdr
, sym_hashes
,
2177 unresolved_reloc
, warned
);
2183 /* Relocation is to the entry for this symbol in the global
2185 if (htab
->sgot
== NULL
)
2192 off
= h
->got
.offset
;
2193 dyn
= htab
->elf
.dynamic_sections_created
;
2194 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2196 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2197 || (ELF_ST_VISIBILITY (h
->other
)
2198 && h
->root
.type
== bfd_link_hash_undefweak
))
2200 /* This is actually a static link, or it is a
2201 -Bsymbolic link and the symbol is defined
2202 locally, or the symbol was forced to be local
2203 because of a version file. We must initialize
2204 this entry in the global offset table. Since the
2205 offset must always be a multiple of 4, we use the
2206 least significant bit to record whether we have
2207 initialized it already.
2209 When doing a dynamic link, we create a .rel.got
2210 relocation entry to initialize the value. This
2211 is done in the finish_dynamic_symbol routine. */
2216 bfd_put_32 (output_bfd
, relocation
,
2217 htab
->sgot
->contents
+ off
);
2222 unresolved_reloc
= FALSE
;
2226 if (local_got_offsets
== NULL
)
2229 off
= local_got_offsets
[r_symndx
];
2231 /* The offset must always be a multiple of 4. We use
2232 the least significant bit to record whether we have
2233 already generated the necessary reloc. */
2238 bfd_put_32 (output_bfd
, relocation
,
2239 htab
->sgot
->contents
+ off
);
2244 Elf_Internal_Rela outrel
;
2251 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2252 + htab
->sgot
->output_offset
2254 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2256 loc
+= s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2257 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2260 local_got_offsets
[r_symndx
] |= 1;
2264 if (off
>= (bfd_vma
) -2)
2267 relocation
= htab
->sgot
->output_section
->vma
2268 + htab
->sgot
->output_offset
+ off
2269 - htab
->sgotplt
->output_section
->vma
2270 - htab
->sgotplt
->output_offset
;
2274 /* Relocation is relative to the start of the global offset
2277 /* Note that sgot is not involved in this
2278 calculation. We always want the start of .got.plt. If we
2279 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2280 permitted by the ABI, we might have to change this
2282 relocation
-= htab
->sgotplt
->output_section
->vma
2283 + htab
->sgotplt
->output_offset
;
2287 /* Use global offset table as symbol value. */
2288 relocation
= htab
->sgotplt
->output_section
->vma
2289 + htab
->sgotplt
->output_offset
;
2290 unresolved_reloc
= FALSE
;
2294 /* Relocation is to the entry for this symbol in the
2295 procedure linkage table. */
2297 /* Resolve a PLT32 reloc against a local symbol directly,
2298 without using the procedure linkage table. */
2302 if (h
->plt
.offset
== (bfd_vma
) -1
2303 || htab
->splt
== NULL
)
2305 /* We didn't make a PLT entry for this symbol. This
2306 happens when statically linking PIC code, or when
2307 using -Bsymbolic. */
2311 relocation
= (htab
->splt
->output_section
->vma
2312 + htab
->splt
->output_offset
2314 unresolved_reloc
= FALSE
;
2319 /* r_symndx will be zero only for relocs against symbols
2320 from removed linkonce sections, or sections discarded by
2324 /* Zero the section contents. eh_frame generated by old
2325 versions of gcc isn't edited by elf-eh-frame.c, so
2326 FDEs for discarded linkonce functions might remain.
2327 Putting zeros here will zero such FDE's address range.
2328 This is a hint to unwinders and other consumers of
2329 exception handling info that the FDE is invalid. */
2330 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2334 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2339 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2340 || h
->root
.type
!= bfd_link_hash_undefweak
)
2341 && (r_type
!= R_386_PC32
2342 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2343 || (ELIMINATE_COPY_RELOCS
2350 || h
->root
.type
== bfd_link_hash_undefweak
2351 || h
->root
.type
== bfd_link_hash_undefined
)))
2353 Elf_Internal_Rela outrel
;
2355 bfd_boolean skip
, relocate
;
2358 /* When generating a shared object, these relocations
2359 are copied into the output file to be resolved at run
2366 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2368 if (outrel
.r_offset
== (bfd_vma
) -1)
2370 else if (outrel
.r_offset
== (bfd_vma
) -2)
2371 skip
= TRUE
, relocate
= TRUE
;
2372 outrel
.r_offset
+= (input_section
->output_section
->vma
2373 + input_section
->output_offset
);
2376 memset (&outrel
, 0, sizeof outrel
);
2379 && (r_type
== R_386_PC32
2382 || !h
->def_regular
))
2383 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2386 /* This symbol is local, or marked to become local. */
2388 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2391 sreloc
= elf_section_data (input_section
)->sreloc
;
2395 loc
= sreloc
->contents
;
2396 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2397 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2399 /* If this reloc is against an external symbol, we do
2400 not want to fiddle with the addend. Otherwise, we
2401 need to include the symbol value so that it becomes
2402 an addend for the dynamic reloc. */
2411 Elf_Internal_Rela outrel
;
2415 outrel
.r_offset
= rel
->r_offset
2416 + input_section
->output_section
->vma
2417 + input_section
->output_offset
;
2418 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2419 sreloc
= elf_section_data (input_section
)->sreloc
;
2422 loc
= sreloc
->contents
;
2423 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2424 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2429 case R_386_TLS_IE_32
:
2430 case R_386_TLS_GOTIE
:
2431 r_type
= elf_i386_tls_transition (info
, r_type
, h
== NULL
);
2432 tls_type
= GOT_UNKNOWN
;
2433 if (h
== NULL
&& local_got_offsets
)
2434 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
2437 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2438 if (!info
->shared
&& h
->dynindx
== -1 && (tls_type
& GOT_TLS_IE
))
2439 r_type
= R_386_TLS_LE_32
;
2441 if (tls_type
== GOT_TLS_IE
)
2442 tls_type
= GOT_TLS_IE_NEG
;
2443 if (r_type
== R_386_TLS_GD
)
2445 if (tls_type
== GOT_TLS_IE_POS
)
2446 r_type
= R_386_TLS_GOTIE
;
2447 else if (tls_type
& GOT_TLS_IE
)
2448 r_type
= R_386_TLS_IE_32
;
2451 if (r_type
== R_386_TLS_LE_32
)
2453 BFD_ASSERT (! unresolved_reloc
);
2454 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
2456 unsigned int val
, type
;
2459 /* GD->LE transition. */
2460 BFD_ASSERT (rel
->r_offset
>= 2);
2461 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2462 BFD_ASSERT (type
== 0x8d || type
== 0x04);
2463 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->size
);
2464 BFD_ASSERT (bfd_get_8 (input_bfd
,
2465 contents
+ rel
->r_offset
+ 4)
2467 BFD_ASSERT (rel
+ 1 < relend
);
2468 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2469 roff
= rel
->r_offset
+ 5;
2470 val
= bfd_get_8 (input_bfd
,
2471 contents
+ rel
->r_offset
- 1);
2474 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2476 movl %gs:0, %eax; subl $foo@tpoff, %eax
2477 (6 byte form of subl). */
2478 BFD_ASSERT (rel
->r_offset
>= 3);
2479 BFD_ASSERT (bfd_get_8 (input_bfd
,
2480 contents
+ rel
->r_offset
- 3)
2482 BFD_ASSERT ((val
& 0xc7) == 0x05 && val
!= (4 << 3));
2483 memcpy (contents
+ rel
->r_offset
- 3,
2484 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2488 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2489 if (rel
->r_offset
+ 10 <= input_section
->size
2490 && bfd_get_8 (input_bfd
,
2491 contents
+ rel
->r_offset
+ 9) == 0x90)
2493 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2495 movl %gs:0, %eax; subl $foo@tpoff, %eax
2496 (6 byte form of subl). */
2497 memcpy (contents
+ rel
->r_offset
- 2,
2498 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2499 roff
= rel
->r_offset
+ 6;
2503 /* leal foo(%reg), %eax; call ___tls_get_addr
2505 movl %gs:0, %eax; subl $foo@tpoff, %eax
2506 (5 byte form of subl). */
2507 memcpy (contents
+ rel
->r_offset
- 2,
2508 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2511 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2513 /* Skip R_386_PLT32. */
2517 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
2519 unsigned int val
, type
;
2521 /* IE->LE transition:
2522 Originally it can be one of:
2530 BFD_ASSERT (rel
->r_offset
>= 1);
2531 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2532 BFD_ASSERT (rel
->r_offset
+ 4 <= input_section
->size
);
2535 /* movl foo, %eax. */
2536 bfd_put_8 (output_bfd
, 0xb8,
2537 contents
+ rel
->r_offset
- 1);
2541 BFD_ASSERT (rel
->r_offset
>= 2);
2542 type
= bfd_get_8 (input_bfd
,
2543 contents
+ rel
->r_offset
- 2);
2548 BFD_ASSERT ((val
& 0xc7) == 0x05);
2549 bfd_put_8 (output_bfd
, 0xc7,
2550 contents
+ rel
->r_offset
- 2);
2551 bfd_put_8 (output_bfd
,
2552 0xc0 | ((val
>> 3) & 7),
2553 contents
+ rel
->r_offset
- 1);
2557 BFD_ASSERT ((val
& 0xc7) == 0x05);
2558 bfd_put_8 (output_bfd
, 0x81,
2559 contents
+ rel
->r_offset
- 2);
2560 bfd_put_8 (output_bfd
,
2561 0xc0 | ((val
>> 3) & 7),
2562 contents
+ rel
->r_offset
- 1);
2569 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
2570 contents
+ rel
->r_offset
);
2575 unsigned int val
, type
;
2577 /* {IE_32,GOTIE}->LE transition:
2578 Originally it can be one of:
2579 subl foo(%reg1), %reg2
2580 movl foo(%reg1), %reg2
2581 addl foo(%reg1), %reg2
2584 movl $foo, %reg2 (6 byte form)
2585 addl $foo, %reg2. */
2586 BFD_ASSERT (rel
->r_offset
>= 2);
2587 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2588 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2589 BFD_ASSERT (rel
->r_offset
+ 4 <= input_section
->size
);
2590 BFD_ASSERT ((val
& 0xc0) == 0x80 && (val
& 7) != 4);
2594 bfd_put_8 (output_bfd
, 0xc7,
2595 contents
+ rel
->r_offset
- 2);
2596 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2597 contents
+ rel
->r_offset
- 1);
2599 else if (type
== 0x2b)
2602 bfd_put_8 (output_bfd
, 0x81,
2603 contents
+ rel
->r_offset
- 2);
2604 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
2605 contents
+ rel
->r_offset
- 1);
2607 else if (type
== 0x03)
2610 bfd_put_8 (output_bfd
, 0x81,
2611 contents
+ rel
->r_offset
- 2);
2612 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2613 contents
+ rel
->r_offset
- 1);
2617 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
2618 bfd_put_32 (output_bfd
, -tpoff (info
, relocation
),
2619 contents
+ rel
->r_offset
);
2621 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2622 contents
+ rel
->r_offset
);
2627 if (htab
->sgot
== NULL
)
2631 off
= h
->got
.offset
;
2634 if (local_got_offsets
== NULL
)
2637 off
= local_got_offsets
[r_symndx
];
2644 Elf_Internal_Rela outrel
;
2648 if (htab
->srelgot
== NULL
)
2651 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2652 + htab
->sgot
->output_offset
+ off
);
2654 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2655 if (r_type
== R_386_TLS_GD
)
2656 dr_type
= R_386_TLS_DTPMOD32
;
2657 else if (tls_type
== GOT_TLS_IE_POS
)
2658 dr_type
= R_386_TLS_TPOFF
;
2660 dr_type
= R_386_TLS_TPOFF32
;
2661 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
2662 bfd_put_32 (output_bfd
, relocation
- dtpoff_base (info
),
2663 htab
->sgot
->contents
+ off
);
2664 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
2665 bfd_put_32 (output_bfd
, dtpoff_base (info
) - relocation
,
2666 htab
->sgot
->contents
+ off
);
2668 bfd_put_32 (output_bfd
, 0,
2669 htab
->sgot
->contents
+ off
);
2670 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
2671 loc
= htab
->srelgot
->contents
;
2672 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2673 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2675 if (r_type
== R_386_TLS_GD
)
2679 BFD_ASSERT (! unresolved_reloc
);
2680 bfd_put_32 (output_bfd
,
2681 relocation
- dtpoff_base (info
),
2682 htab
->sgot
->contents
+ off
+ 4);
2686 bfd_put_32 (output_bfd
, 0,
2687 htab
->sgot
->contents
+ off
+ 4);
2688 outrel
.r_info
= ELF32_R_INFO (indx
,
2689 R_386_TLS_DTPOFF32
);
2690 outrel
.r_offset
+= 4;
2691 htab
->srelgot
->reloc_count
++;
2692 loc
+= sizeof (Elf32_External_Rel
);
2693 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2696 else if (tls_type
== GOT_TLS_IE_BOTH
)
2698 bfd_put_32 (output_bfd
,
2699 indx
== 0 ? relocation
- dtpoff_base (info
) : 0,
2700 htab
->sgot
->contents
+ off
+ 4);
2701 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
2702 outrel
.r_offset
+= 4;
2703 htab
->srelgot
->reloc_count
++;
2704 loc
+= sizeof (Elf32_External_Rel
);
2705 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2711 local_got_offsets
[r_symndx
] |= 1;
2714 if (off
>= (bfd_vma
) -2)
2716 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
2718 bfd_vma g_o_t
= htab
->sgotplt
->output_section
->vma
2719 + htab
->sgotplt
->output_offset
;
2720 relocation
= htab
->sgot
->output_section
->vma
2721 + htab
->sgot
->output_offset
+ off
- g_o_t
;
2722 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
2723 && tls_type
== GOT_TLS_IE_BOTH
)
2725 if (r_type
== R_386_TLS_IE
)
2726 relocation
+= g_o_t
;
2727 unresolved_reloc
= FALSE
;
2731 unsigned int val
, type
;
2734 /* GD->IE transition. */
2735 BFD_ASSERT (rel
->r_offset
>= 2);
2736 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2737 BFD_ASSERT (type
== 0x8d || type
== 0x04);
2738 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->size
);
2739 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
+ 4)
2741 BFD_ASSERT (rel
+ 1 < relend
);
2742 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2743 roff
= rel
->r_offset
- 3;
2744 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2747 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2749 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2750 BFD_ASSERT (rel
->r_offset
>= 3);
2751 BFD_ASSERT (bfd_get_8 (input_bfd
,
2752 contents
+ rel
->r_offset
- 3)
2754 BFD_ASSERT ((val
& 0xc7) == 0x05 && val
!= (4 << 3));
2759 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2761 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2762 BFD_ASSERT (rel
->r_offset
+ 10 <= input_section
->size
);
2763 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2764 BFD_ASSERT (bfd_get_8 (input_bfd
,
2765 contents
+ rel
->r_offset
+ 9)
2767 roff
= rel
->r_offset
- 2;
2769 memcpy (contents
+ roff
,
2770 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2771 contents
[roff
+ 7] = 0x80 | (val
& 7);
2772 /* If foo is used only with foo@gotntpoff(%reg) and
2773 foo@indntpoff, but not with foo@gottpoff(%reg), change
2774 subl $foo@gottpoff(%reg), %eax
2776 addl $foo@gotntpoff(%reg), %eax. */
2777 if (r_type
== R_386_TLS_GOTIE
)
2779 contents
[roff
+ 6] = 0x03;
2780 if (tls_type
== GOT_TLS_IE_BOTH
)
2783 bfd_put_32 (output_bfd
,
2784 htab
->sgot
->output_section
->vma
2785 + htab
->sgot
->output_offset
+ off
2786 - htab
->sgotplt
->output_section
->vma
2787 - htab
->sgotplt
->output_offset
,
2788 contents
+ roff
+ 8);
2789 /* Skip R_386_PLT32. */
2800 /* LD->LE transition:
2802 leal foo(%reg), %eax; call ___tls_get_addr.
2804 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2805 BFD_ASSERT (rel
->r_offset
>= 2);
2806 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2)
2808 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2809 BFD_ASSERT ((val
& 0xf8) == 0x80 && (val
& 7) != 4);
2810 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->size
);
2811 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
+ 4)
2813 BFD_ASSERT (rel
+ 1 < relend
);
2814 BFD_ASSERT (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
);
2815 memcpy (contents
+ rel
->r_offset
- 2,
2816 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2817 /* Skip R_386_PLT32. */
2822 if (htab
->sgot
== NULL
)
2825 off
= htab
->tls_ldm_got
.offset
;
2830 Elf_Internal_Rela outrel
;
2833 if (htab
->srelgot
== NULL
)
2836 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2837 + htab
->sgot
->output_offset
+ off
);
2839 bfd_put_32 (output_bfd
, 0,
2840 htab
->sgot
->contents
+ off
);
2841 bfd_put_32 (output_bfd
, 0,
2842 htab
->sgot
->contents
+ off
+ 4);
2843 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
2844 loc
= htab
->srelgot
->contents
;
2845 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2846 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2847 htab
->tls_ldm_got
.offset
|= 1;
2849 relocation
= htab
->sgot
->output_section
->vma
2850 + htab
->sgot
->output_offset
+ off
2851 - htab
->sgotplt
->output_section
->vma
2852 - htab
->sgotplt
->output_offset
;
2853 unresolved_reloc
= FALSE
;
2856 case R_386_TLS_LDO_32
:
2857 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
2858 relocation
-= dtpoff_base (info
);
2860 /* When converting LDO to LE, we must negate. */
2861 relocation
= -tpoff (info
, relocation
);
2864 case R_386_TLS_LE_32
:
2868 Elf_Internal_Rela outrel
;
2873 outrel
.r_offset
= rel
->r_offset
2874 + input_section
->output_section
->vma
2875 + input_section
->output_offset
;
2876 if (h
!= NULL
&& h
->dynindx
!= -1)
2880 if (r_type
== R_386_TLS_LE_32
)
2881 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
2883 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
2884 sreloc
= elf_section_data (input_section
)->sreloc
;
2887 loc
= sreloc
->contents
;
2888 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
2889 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2892 else if (r_type
== R_386_TLS_LE_32
)
2893 relocation
= dtpoff_base (info
) - relocation
;
2895 relocation
-= dtpoff_base (info
);
2897 else if (r_type
== R_386_TLS_LE_32
)
2898 relocation
= tpoff (info
, relocation
);
2900 relocation
= -tpoff (info
, relocation
);
2907 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2908 because such sections are not SEC_ALLOC and thus ld.so will
2909 not process them. */
2910 if (unresolved_reloc
2911 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2914 (*_bfd_error_handler
)
2915 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2918 (long) rel
->r_offset
,
2919 h
->root
.root
.string
);
2923 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
2924 contents
, rel
->r_offset
,
2927 if (r
!= bfd_reloc_ok
)
2932 name
= h
->root
.root
.string
;
2935 name
= bfd_elf_string_from_elf_section (input_bfd
,
2936 symtab_hdr
->sh_link
,
2941 name
= bfd_section_name (input_bfd
, sec
);
2944 if (r
== bfd_reloc_overflow
)
2946 if (! ((*info
->callbacks
->reloc_overflow
)
2947 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
2948 (bfd_vma
) 0, input_bfd
, input_section
,
2954 (*_bfd_error_handler
)
2955 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
2956 input_bfd
, input_section
,
2957 (long) rel
->r_offset
, name
, (int) r
);
2966 /* Finish up dynamic symbol handling. We set the contents of various
2967 dynamic sections here. */
2970 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
2971 struct bfd_link_info
*info
,
2972 struct elf_link_hash_entry
*h
,
2973 Elf_Internal_Sym
*sym
)
2975 struct elf_i386_link_hash_table
*htab
;
2977 htab
= elf_i386_hash_table (info
);
2979 if (h
->plt
.offset
!= (bfd_vma
) -1)
2983 Elf_Internal_Rela rel
;
2986 /* This symbol has an entry in the procedure linkage table. Set
2989 if (h
->dynindx
== -1
2990 || htab
->splt
== NULL
2991 || htab
->sgotplt
== NULL
2992 || htab
->srelplt
== NULL
)
2995 /* Get the index in the procedure linkage table which
2996 corresponds to this symbol. This is the index of this symbol
2997 in all the symbols for which we are making plt entries. The
2998 first entry in the procedure linkage table is reserved. */
2999 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3001 /* Get the offset into the .got table of the entry that
3002 corresponds to this function. Each .got entry is 4 bytes.
3003 The first three are reserved. */
3004 got_offset
= (plt_index
+ 3) * 4;
3006 /* Fill in the entry in the procedure linkage table. */
3009 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_plt_entry
,
3011 bfd_put_32 (output_bfd
,
3012 (htab
->sgotplt
->output_section
->vma
3013 + htab
->sgotplt
->output_offset
3015 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3019 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_pic_plt_entry
,
3021 bfd_put_32 (output_bfd
, got_offset
,
3022 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3025 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
3026 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3027 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3028 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3030 /* Fill in the entry in the global offset table. */
3031 bfd_put_32 (output_bfd
,
3032 (htab
->splt
->output_section
->vma
3033 + htab
->splt
->output_offset
3036 htab
->sgotplt
->contents
+ got_offset
);
3038 /* Fill in the entry in the .rel.plt section. */
3039 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3040 + htab
->sgotplt
->output_offset
3042 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
3043 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3044 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3046 if (!h
->def_regular
)
3048 /* Mark the symbol as undefined, rather than as defined in
3049 the .plt section. Leave the value if there were any
3050 relocations where pointer equality matters (this is a clue
3051 for the dynamic linker, to make function pointer
3052 comparisons work between an application and shared
3053 library), otherwise set it to zero. If a function is only
3054 called from a binary, there is no need to slow down
3055 shared libraries because of that. */
3056 sym
->st_shndx
= SHN_UNDEF
;
3057 if (!h
->pointer_equality_needed
)
3062 if (h
->got
.offset
!= (bfd_vma
) -1
3063 && elf_i386_hash_entry(h
)->tls_type
!= GOT_TLS_GD
3064 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
3066 Elf_Internal_Rela rel
;
3069 /* This symbol has an entry in the global offset table. Set it
3072 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3075 rel
.r_offset
= (htab
->sgot
->output_section
->vma
3076 + htab
->sgot
->output_offset
3077 + (h
->got
.offset
& ~(bfd_vma
) 1));
3079 /* If this is a static link, or it is a -Bsymbolic link and the
3080 symbol is defined locally or was forced to be local because
3081 of a version file, we just want to emit a RELATIVE reloc.
3082 The entry in the global offset table will already have been
3083 initialized in the relocate_section function. */
3085 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3087 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3088 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3092 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3093 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
3094 htab
->sgot
->contents
+ h
->got
.offset
);
3095 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
3098 loc
= htab
->srelgot
->contents
;
3099 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3100 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3105 Elf_Internal_Rela rel
;
3108 /* This symbol needs a copy reloc. Set it up. */
3110 if (h
->dynindx
== -1
3111 || (h
->root
.type
!= bfd_link_hash_defined
3112 && h
->root
.type
!= bfd_link_hash_defweak
)
3113 || htab
->srelbss
== NULL
)
3116 rel
.r_offset
= (h
->root
.u
.def
.value
3117 + h
->root
.u
.def
.section
->output_section
->vma
3118 + h
->root
.u
.def
.section
->output_offset
);
3119 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
3120 loc
= htab
->srelbss
->contents
;
3121 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3122 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3125 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3126 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3127 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3128 sym
->st_shndx
= SHN_ABS
;
3133 /* Used to decide how to sort relocs in an optimal manner for the
3134 dynamic linker, before writing them out. */
3136 static enum elf_reloc_type_class
3137 elf_i386_reloc_type_class (const Elf_Internal_Rela
*rela
)
3139 switch (ELF32_R_TYPE (rela
->r_info
))
3141 case R_386_RELATIVE
:
3142 return reloc_class_relative
;
3143 case R_386_JUMP_SLOT
:
3144 return reloc_class_plt
;
3146 return reloc_class_copy
;
3148 return reloc_class_normal
;
3152 /* Finish up the dynamic sections. */
3155 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
3156 struct bfd_link_info
*info
)
3158 struct elf_i386_link_hash_table
*htab
;
3162 htab
= elf_i386_hash_table (info
);
3163 dynobj
= htab
->elf
.dynobj
;
3164 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3166 if (htab
->elf
.dynamic_sections_created
)
3168 Elf32_External_Dyn
*dyncon
, *dynconend
;
3170 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3173 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3174 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3175 for (; dyncon
< dynconend
; dyncon
++)
3177 Elf_Internal_Dyn dyn
;
3180 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3189 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3194 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3199 dyn
.d_un
.d_val
= s
->size
;
3203 /* My reading of the SVR4 ABI indicates that the
3204 procedure linkage table relocs (DT_JMPREL) should be
3205 included in the overall relocs (DT_REL). This is
3206 what Solaris does. However, UnixWare can not handle
3207 that case. Therefore, we override the DT_RELSZ entry
3208 here to make it not include the JMPREL relocs. */
3212 dyn
.d_un
.d_val
-= s
->size
;
3216 /* We may not be using the standard ELF linker script.
3217 If .rel.plt is the first .rel section, we adjust
3218 DT_REL to not include it. */
3222 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
3224 dyn
.d_un
.d_ptr
+= s
->size
;
3228 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3231 /* Fill in the first entry in the procedure linkage table. */
3232 if (htab
->splt
&& htab
->splt
->size
> 0)
3235 memcpy (htab
->splt
->contents
,
3236 elf_i386_pic_plt0_entry
, PLT_ENTRY_SIZE
);
3239 memcpy (htab
->splt
->contents
,
3240 elf_i386_plt0_entry
, PLT_ENTRY_SIZE
);
3241 bfd_put_32 (output_bfd
,
3242 (htab
->sgotplt
->output_section
->vma
3243 + htab
->sgotplt
->output_offset
3245 htab
->splt
->contents
+ 2);
3246 bfd_put_32 (output_bfd
,
3247 (htab
->sgotplt
->output_section
->vma
3248 + htab
->sgotplt
->output_offset
3250 htab
->splt
->contents
+ 8);
3253 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3254 really seem like the right value. */
3255 elf_section_data (htab
->splt
->output_section
)
3256 ->this_hdr
.sh_entsize
= 4;
3262 /* Fill in the first three entries in the global offset table. */
3263 if (htab
->sgotplt
->size
> 0)
3265 bfd_put_32 (output_bfd
,
3267 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
3268 htab
->sgotplt
->contents
);
3269 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 4);
3270 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 8);
3273 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
3276 if (htab
->sgot
&& htab
->sgot
->size
> 0)
3277 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
3282 /* Return address for Ith PLT stub in section PLT, for relocation REL
3283 or (bfd_vma) -1 if it should not be included. */
3286 elf_i386_plt_sym_val (bfd_vma i
, const asection
*plt
,
3287 const arelent
*rel ATTRIBUTE_UNUSED
)
3289 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
3293 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3294 #define TARGET_LITTLE_NAME "elf32-i386"
3295 #define ELF_ARCH bfd_arch_i386
3296 #define ELF_MACHINE_CODE EM_386
3297 #define ELF_MAXPAGESIZE 0x1000
3299 #define elf_backend_can_gc_sections 1
3300 #define elf_backend_can_refcount 1
3301 #define elf_backend_want_got_plt 1
3302 #define elf_backend_plt_readonly 1
3303 #define elf_backend_want_plt_sym 0
3304 #define elf_backend_got_header_size 12
3306 /* Support RELA for objdump of prelink objects. */
3307 #define elf_info_to_howto elf_i386_info_to_howto_rel
3308 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3310 #define bfd_elf32_mkobject elf_i386_mkobject
3312 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3313 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3314 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3316 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3317 #define elf_backend_check_relocs elf_i386_check_relocs
3318 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3319 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3320 #define elf_backend_fake_sections elf_i386_fake_sections
3321 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3322 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3323 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3324 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3325 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3326 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3327 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3328 #define elf_backend_relocate_section elf_i386_relocate_section
3329 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3330 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3332 #include "elf32-target.h"
3334 /* FreeBSD support. */
3336 #undef TARGET_LITTLE_SYM
3337 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3338 #undef TARGET_LITTLE_NAME
3339 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3341 /* The kernel recognizes executables as valid only if they carry a
3342 "FreeBSD" label in the ELF header. So we put this label on all
3343 executables and (for simplicity) also all other object files. */
3346 elf_i386_post_process_headers (bfd
*abfd
,
3347 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
3349 Elf_Internal_Ehdr
*i_ehdrp
;
3351 i_ehdrp
= elf_elfheader (abfd
);
3353 /* Put an ABI label supported by FreeBSD >= 4.1. */
3354 i_ehdrp
->e_ident
[EI_OSABI
] = ELFOSABI_FREEBSD
;
3355 #ifdef OLD_FREEBSD_ABI_LABEL
3356 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3357 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
3361 #undef elf_backend_post_process_headers
3362 #define elf_backend_post_process_headers elf_i386_post_process_headers
3364 #define elf32_bed elf32_i386_fbsd_bed
3366 #include "elf32-target.h"