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 ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1683 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1686 struct elf_i386_dyn_relocs **pp;
1688 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1690 p->count -= p->pc_count;
1699 /* Also discard relocs on undefined weak syms with non-default
1701 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1702 && h->root.type == bfd_link_hash_undefweak)
1703 eh->dyn_relocs = NULL;
1705 else if (ELIMINATE_COPY_RELOCS)
1707 /* For the non-shared case, discard space for relocs against
1708 symbols which turn out to need copy relocs or are not
1711 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1712 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1713 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1714 || (htab->elf.dynamic_sections_created
1715 && (h->root.type == bfd_link_hash_undefweak
1716 || h->root.type == bfd_link_hash_undefined))))
1718 /* Make sure this symbol is output as a dynamic symbol.
1719 Undefined weak syms won't yet be marked as dynamic. */
1720 if (h->dynindx == -1
1721 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1723 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1727 /* If that succeeded, we know we'll be keeping all the
1729 if (h->dynindx != -1)
1733 eh->dyn_relocs = NULL;
1738 /* Finally, allocate space. */
1739 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1741 asection *sreloc = elf_section_data (p->sec)->sreloc;
1742 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1748 /* Find any dynamic relocs that apply to read-only sections. */
1751 readonly_dynrelocs (h, inf)
1752 struct elf_link_hash_entry *h;
1755 struct elf_i386_link_hash_entry *eh;
1756 struct elf_i386_dyn_relocs *p;
1758 if (h->root.type == bfd_link_hash_warning)
1759 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1761 eh = (struct elf_i386_link_hash_entry *) h;
1762 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1764 asection *s = p->sec->output_section;
1766 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1768 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1770 info->flags |= DF_TEXTREL;
1772 /* Not an error, just cut short the traversal. */
1779 /* Set the sizes of the dynamic sections. */
1782 elf_i386_size_dynamic_sections (output_bfd, info)
1783 bfd *output_bfd ATTRIBUTE_UNUSED;
1784 struct bfd_link_info *info;
1786 struct elf_i386_link_hash_table *htab;
1792 htab = elf_i386_hash_table (info);
1793 dynobj = htab->elf.dynobj;
1797 if (htab->elf.dynamic_sections_created)
1799 /* Set the contents of the .interp section to the interpreter. */
1802 s = bfd_get_section_by_name (dynobj, ".interp");
1805 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1806 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1810 /* Set up .got offsets for local syms, and space for local dynamic
1812 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1814 bfd_signed_vma *local_got;
1815 bfd_signed_vma *end_local_got;
1816 char *local_tls_type;
1817 bfd_size_type locsymcount;
1818 Elf_Internal_Shdr *symtab_hdr;
1821 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1824 for (s = ibfd->sections; s != NULL; s = s->next)
1826 struct elf_i386_dyn_relocs *p;
1828 for (p = *((struct elf_i386_dyn_relocs **)
1829 &elf_section_data (s)->local_dynrel);
1833 if (!bfd_is_abs_section (p->sec)
1834 && bfd_is_abs_section (p->sec->output_section))
1836 /* Input section has been discarded, either because
1837 it is a copy of a linkonce section or due to
1838 linker script /DISCARD/, so we'll be discarding
1841 else if (p->count != 0)
1843 srel = elf_section_data (p->sec)->sreloc;
1844 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1845 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1846 info->flags |= DF_TEXTREL;
1851 local_got = elf_local_got_refcounts (ibfd);
1855 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1856 locsymcount = symtab_hdr->sh_info;
1857 end_local_got = local_got + locsymcount;
1858 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1860 srel = htab->srelgot;
1861 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1865 *local_got = s->_raw_size;
1867 if (*local_tls_type == GOT_TLS_GD
1868 || *local_tls_type == GOT_TLS_IE_BOTH)
1871 || *local_tls_type == GOT_TLS_GD
1872 || (*local_tls_type & GOT_TLS_IE))
1874 if (*local_tls_type == GOT_TLS_IE_BOTH)
1875 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1877 srel->_raw_size += sizeof (Elf32_External_Rel);
1881 *local_got = (bfd_vma) -1;
1885 if (htab->tls_ldm_got.refcount > 0)
1887 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1889 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1890 htab->sgot->_raw_size += 8;
1891 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1894 htab->tls_ldm_got.offset = -1;
1896 /* Allocate global sym .plt and .got entries, and space for global
1897 sym dynamic relocs. */
1898 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1900 /* We now have determined the sizes of the various dynamic sections.
1901 Allocate memory for them. */
1903 for (s = dynobj->sections; s != NULL; s = s->next)
1905 if ((s->flags & SEC_LINKER_CREATED) == 0)
1910 || s == htab->sgotplt)
1912 /* Strip this section if we don't need it; see the
1915 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1917 if (s->_raw_size != 0 && s != htab->srelplt)
1920 /* We use the reloc_count field as a counter if we need
1921 to copy relocs into the output file. */
1926 /* It's not one of our sections, so don't allocate space. */
1930 if (s->_raw_size == 0)
1932 /* If we don't need this section, strip it from the
1933 output file. This is mostly to handle .rel.bss and
1934 .rel.plt. We must create both sections in
1935 create_dynamic_sections, because they must be created
1936 before the linker maps input sections to output
1937 sections. The linker does that before
1938 adjust_dynamic_symbol is called, and it is that
1939 function which decides whether anything needs to go
1940 into these sections. */
1942 _bfd_strip_section_from_output (info, s);
1946 /* Allocate memory for the section contents. We use bfd_zalloc
1947 here in case unused entries are not reclaimed before the
1948 section's contents are written out. This should not happen,
1949 but this way if it does, we get a R_386_NONE reloc instead
1951 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1952 if (s->contents == NULL)
1956 if (htab->elf.dynamic_sections_created)
1958 /* Add some entries to the .dynamic section. We fill in the
1959 values later, in elf_i386_finish_dynamic_sections, but we
1960 must add the entries now so that we get the correct size for
1961 the .dynamic section. The DT_DEBUG entry is filled in by the
1962 dynamic linker and used by the debugger. */
1963 #define add_dynamic_entry(TAG, VAL) \
1964 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1968 if (!add_dynamic_entry (DT_DEBUG, 0))
1972 if (htab->splt->_raw_size != 0)
1974 if (!add_dynamic_entry (DT_PLTGOT, 0)
1975 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1976 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1977 || !add_dynamic_entry (DT_JMPREL, 0))
1983 if (!add_dynamic_entry (DT_REL, 0)
1984 || !add_dynamic_entry (DT_RELSZ, 0)
1985 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1988 /* If any dynamic relocs apply to a read-only section,
1989 then we need a DT_TEXTREL entry. */
1990 if ((info->flags & DF_TEXTREL) == 0)
1991 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1994 if ((info->flags & DF_TEXTREL) != 0)
1996 if (!add_dynamic_entry (DT_TEXTREL, 0))
2001 #undef add_dynamic_entry
2006 /* Set the correct type for an x86 ELF section. We do this by the
2007 section name, which is a hack, but ought to work. */
2010 elf_i386_fake_sections (abfd, hdr, sec)
2011 bfd *abfd ATTRIBUTE_UNUSED;
2012 Elf_Internal_Shdr *hdr;
2015 register const char *name;
2017 name = bfd_get_section_name (abfd, sec);
2019 /* This is an ugly, but unfortunately necessary hack that is
2020 needed when producing EFI binaries on x86. It tells
2021 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2022 containing ELF relocation info. We need this hack in order to
2023 be able to generate ELF binaries that can be translated into
2024 EFI applications (which are essentially COFF objects). Those
2025 files contain a COFF ".reloc" section inside an ELFNN object,
2026 which would normally cause BFD to segfault because it would
2027 attempt to interpret this section as containing relocation
2028 entries for section "oc". With this hack enabled, ".reloc"
2029 will be treated as a normal data section, which will avoid the
2030 segfault. However, you won't be able to create an ELFNN binary
2031 with a section named "oc" that needs relocations, but that's
2032 the kind of ugly side-effects you get when detecting section
2033 types based on their names... In practice, this limitation is
2034 unlikely to bite. */
2035 if (strcmp (name, ".reloc") == 0)
2036 hdr->sh_type = SHT_PROGBITS;
2041 /* Return the base VMA address which should be subtracted from real addresses
2042 when resolving @dtpoff relocation.
2043 This is PT_TLS segment p_vaddr. */
2047 struct bfd_link_info *info;
2049 /* If tls_segment is NULL, we should have signalled an error already. */
2050 if (elf_hash_table (info)->tls_segment == NULL)
2052 return elf_hash_table (info)->tls_segment->start;
2055 /* Return the relocation value for @tpoff relocation
2056 if STT_TLS virtual address is ADDRESS. */
2059 tpoff (info, address)
2060 struct bfd_link_info *info;
2063 struct elf_link_tls_segment *tls_segment
2064 = elf_hash_table (info)->tls_segment;
2066 /* If tls_segment is NULL, we should have signalled an error already. */
2067 if (tls_segment == NULL)
2069 return (align_power (tls_segment->size, tls_segment->align)
2070 + tls_segment->start - address);
2073 /* Relocate an i386 ELF section. */
2076 elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
2077 contents, relocs, local_syms, local_sections)
2079 struct bfd_link_info *info;
2081 asection *input_section;
2083 Elf_Internal_Rela *relocs;
2084 Elf_Internal_Sym *local_syms;
2085 asection **local_sections;
2087 struct elf_i386_link_hash_table *htab;
2088 Elf_Internal_Shdr *symtab_hdr;
2089 struct elf_link_hash_entry **sym_hashes;
2090 bfd_vma *local_got_offsets;
2091 Elf_Internal_Rela *rel;
2092 Elf_Internal_Rela *relend;
2094 htab = elf_i386_hash_table (info);
2095 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2096 sym_hashes = elf_sym_hashes (input_bfd);
2097 local_got_offsets = elf_local_got_offsets (input_bfd);
2100 relend = relocs + input_section->reloc_count;
2101 for (; rel < relend; rel++)
2103 unsigned int r_type;
2104 reloc_howto_type *howto;
2105 unsigned long r_symndx;
2106 struct elf_link_hash_entry *h;
2107 Elf_Internal_Sym *sym;
2111 bfd_boolean unresolved_reloc;
2112 bfd_reloc_status_type r;
2116 r_type = ELF32_R_TYPE (rel->r_info);
2117 if (r_type == (int) R_386_GNU_VTINHERIT
2118 || r_type == (int) R_386_GNU_VTENTRY)
2121 if ((indx = (unsigned) r_type) >= R_386_standard
2122 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2123 >= R_386_ext - R_386_standard)
2124 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2125 >= R_386_tls - R_386_ext))
2127 bfd_set_error (bfd_error_bad_value);
2130 howto = elf_howto_table + indx;
2132 r_symndx = ELF32_R_SYM (rel->r_info);
2134 if (info->relocateable)
2139 /* This is a relocatable link. We don't have to change
2140 anything, unless the reloc is against a section symbol,
2141 in which case we have to adjust according to where the
2142 section symbol winds up in the output section. */
2143 if (r_symndx >= symtab_hdr->sh_info)
2146 sym = local_syms + r_symndx;
2147 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2150 sec = local_sections[r_symndx];
2151 val = sec->output_offset;
2155 where = contents + rel->r_offset;
2156 switch (howto->size)
2158 /* FIXME: overflow checks. */
2160 val += bfd_get_8 (input_bfd, where);
2161 bfd_put_8 (input_bfd, val, where);
2164 val += bfd_get_16 (input_bfd, where);
2165 bfd_put_16 (input_bfd, val, where);
2168 val += bfd_get_32 (input_bfd, where);
2169 bfd_put_32 (input_bfd, val, where);
2177 /* This is a final link. */
2181 unresolved_reloc = FALSE;
2182 if (r_symndx < symtab_hdr->sh_info)
2184 sym = local_syms + r_symndx;
2185 sec = local_sections[r_symndx];
2186 relocation = (sec->output_section->vma
2187 + sec->output_offset
2189 if ((sec->flags & SEC_MERGE)
2190 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2194 bfd_byte *where = contents + rel->r_offset;
2196 switch (howto->size)
2199 addend = bfd_get_8 (input_bfd, where);
2200 if (howto->pc_relative)
2202 addend = (addend ^ 0x80) - 0x80;
2207 addend = bfd_get_16 (input_bfd, where);
2208 if (howto->pc_relative)
2210 addend = (addend ^ 0x8000) - 0x8000;
2215 addend = bfd_get_32 (input_bfd, where);
2216 if (howto->pc_relative)
2218 addend = (addend ^ 0x80000000) - 0x80000000;
2227 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2228 addend -= relocation;
2229 addend += msec->output_section->vma + msec->output_offset;
2231 switch (howto->size)
2234 /* FIXME: overflow checks. */
2235 if (howto->pc_relative)
2237 bfd_put_8 (input_bfd, addend, where);
2240 if (howto->pc_relative)
2242 bfd_put_16 (input_bfd, addend, where);
2245 if (howto->pc_relative)
2247 bfd_put_32 (input_bfd, addend, where);
2254 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2255 while (h->root.type == bfd_link_hash_indirect
2256 || h->root.type == bfd_link_hash_warning)
2257 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2260 if (h->root.type == bfd_link_hash_defined
2261 || h->root.type == bfd_link_hash_defweak)
2263 sec = h->root.u.def.section;
2264 if (sec->output_section == NULL)
2265 /* Set a flag that will be cleared later if we find a
2266 relocation value for this symbol. output_section
2267 is typically NULL for symbols satisfied by a shared
2269 unresolved_reloc = TRUE;
2271 relocation = (h->root.u.def.value
2272 + sec->output_section->vma
2273 + sec->output_offset);
2275 else if (h->root.type == bfd_link_hash_undefweak)
2277 else if (info->shared
2278 && !info->no_undefined
2279 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2283 if (! ((*info->callbacks->undefined_symbol)
2284 (info, h->root.root.string, input_bfd,
2285 input_section, rel->r_offset,
2286 (!info->shared || info->no_undefined
2287 || ELF_ST_VISIBILITY (h->other)))))
2295 /* Relocation is to the entry for this symbol in the global
2297 if (htab->sgot == NULL)
2304 off = h->got.offset;
2305 dyn = htab->elf.dynamic_sections_created;
2306 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2310 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2311 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2312 || (ELF_ST_VISIBILITY (h->other)
2313 && h->root.type == bfd_link_hash_undefweak))
2315 /* This is actually a static link, or it is a
2316 -Bsymbolic link and the symbol is defined
2317 locally, or the symbol was forced to be local
2318 because of a version file. We must initialize
2319 this entry in the global offset table. Since the
2320 offset must always be a multiple of 4, we use the
2321 least significant bit to record whether we have
2322 initialized it already.
2324 When doing a dynamic link, we create a .rel.got
2325 relocation entry to initialize the value. This
2326 is done in the finish_dynamic_symbol routine. */
2331 bfd_put_32 (output_bfd, relocation,
2332 htab->sgot->contents + off);
2337 unresolved_reloc = FALSE;
2341 if (local_got_offsets == NULL)
2344 off = local_got_offsets[r_symndx];
2346 /* The offset must always be a multiple of 4. We use
2347 the least significant bit to record whether we have
2348 already generated the necessary reloc. */
2353 bfd_put_32 (output_bfd, relocation,
2354 htab->sgot->contents + off);
2359 Elf_Internal_Rela outrel;
2366 outrel.r_offset = (htab->sgot->output_section->vma
2367 + htab->sgot->output_offset
2369 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2371 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2372 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2375 local_got_offsets[r_symndx] |= 1;
2379 if (off >= (bfd_vma) -2)
2382 relocation = htab->sgot->output_offset + off;
2386 /* Relocation is relative to the start of the global offset
2389 /* Note that sgot->output_offset is not involved in this
2390 calculation. We always want the start of .got. If we
2391 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2392 permitted by the ABI, we might have to change this
2394 relocation -= htab->sgot->output_section->vma;
2398 /* Use global offset table as symbol value. */
2399 relocation = htab->sgot->output_section->vma;
2400 unresolved_reloc = FALSE;
2404 /* Relocation is to the entry for this symbol in the
2405 procedure linkage table. */
2407 /* Resolve a PLT32 reloc against a local symbol directly,
2408 without using the procedure linkage table. */
2412 if (h->plt.offset == (bfd_vma) -1
2413 || htab->splt == NULL)
2415 /* We didn't make a PLT entry for this symbol. This
2416 happens when statically linking PIC code, or when
2417 using -Bsymbolic. */
2421 relocation = (htab->splt->output_section->vma
2422 + htab->splt->output_offset
2424 unresolved_reloc = FALSE;
2429 /* r_symndx will be zero only for relocs against symbols
2430 from removed linkonce sections, or sections discarded by
2433 || (input_section->flags & SEC_ALLOC) == 0)
2438 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2439 || h->root.type != bfd_link_hash_undefweak)
2440 && (r_type != R_386_PC32
2443 && (! info->symbolic
2444 || (h->elf_link_hash_flags
2445 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2446 || (ELIMINATE_COPY_RELOCS
2450 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2451 && (((h->elf_link_hash_flags
2452 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2453 && (h->elf_link_hash_flags
2454 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2455 || h->root.type == bfd_link_hash_undefweak
2456 || h->root.type == bfd_link_hash_undefined)))
2458 Elf_Internal_Rela outrel;
2460 bfd_boolean skip, relocate;
2463 /* When generating a shared object, these relocations
2464 are copied into the output file to be resolved at run
2471 _bfd_elf_section_offset (output_bfd, info, input_section,
2473 if (outrel.r_offset == (bfd_vma) -1)
2475 else if (outrel.r_offset == (bfd_vma) -2)
2476 skip = TRUE, relocate = TRUE;
2477 outrel.r_offset += (input_section->output_section->vma
2478 + input_section->output_offset);
2481 memset (&outrel, 0, sizeof outrel);
2484 && (r_type == R_386_PC32
2487 || (h->elf_link_hash_flags
2488 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2489 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2492 /* This symbol is local, or marked to become local. */
2494 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2497 sreloc = elf_section_data (input_section)->sreloc;
2501 loc = sreloc->contents;
2502 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2503 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2505 /* If this reloc is against an external symbol, we do
2506 not want to fiddle with the addend. Otherwise, we
2507 need to include the symbol value so that it becomes
2508 an addend for the dynamic reloc. */
2517 Elf_Internal_Rela outrel;
2521 outrel.r_offset = rel->r_offset
2522 + input_section->output_section->vma
2523 + input_section->output_offset;
2524 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2525 sreloc = elf_section_data (input_section)->sreloc;
2528 loc = sreloc->contents;
2529 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2530 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2535 case R_386_TLS_IE_32:
2536 case R_386_TLS_GOTIE:
2537 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2538 tls_type = GOT_UNKNOWN;
2539 if (h == NULL && local_got_offsets)
2540 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2543 tls_type = elf_i386_hash_entry(h)->tls_type;
2544 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2545 r_type = R_386_TLS_LE_32;
2547 if (tls_type == GOT_TLS_IE)
2548 tls_type = GOT_TLS_IE_NEG;
2549 if (r_type == R_386_TLS_GD)
2551 if (tls_type == GOT_TLS_IE_POS)
2552 r_type = R_386_TLS_GOTIE;
2553 else if (tls_type & GOT_TLS_IE)
2554 r_type = R_386_TLS_IE_32;
2557 if (r_type == R_386_TLS_LE_32)
2559 BFD_ASSERT (! unresolved_reloc);
2560 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2562 unsigned int val, type;
2565 /* GD->LE transition. */
2566 BFD_ASSERT (rel->r_offset >= 2);
2567 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2568 BFD_ASSERT (type == 0x8d || type == 0x04);
2569 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2570 BFD_ASSERT (bfd_get_8 (input_bfd,
2571 contents + rel->r_offset + 4)
2573 BFD_ASSERT (rel + 1 < relend);
2574 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2575 roff = rel->r_offset + 5;
2576 val = bfd_get_8 (input_bfd,
2577 contents + rel->r_offset - 1);
2580 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2582 movl %gs:0, %eax; subl $foo@tpoff, %eax
2583 (6 byte form of subl). */
2584 BFD_ASSERT (rel->r_offset >= 3);
2585 BFD_ASSERT (bfd_get_8 (input_bfd,
2586 contents + rel->r_offset - 3)
2588 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2589 memcpy (contents + rel->r_offset - 3,
2590 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2594 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2595 if (rel->r_offset + 10 <= input_section->_raw_size
2596 && bfd_get_8 (input_bfd,
2597 contents + rel->r_offset + 9) == 0x90)
2599 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2601 movl %gs:0, %eax; subl $foo@tpoff, %eax
2602 (6 byte form of subl). */
2603 memcpy (contents + rel->r_offset - 2,
2604 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2605 roff = rel->r_offset + 6;
2609 /* leal foo(%reg), %eax; call ___tls_get_addr
2611 movl %gs:0, %eax; subl $foo@tpoff, %eax
2612 (5 byte form of subl). */
2613 memcpy (contents + rel->r_offset - 2,
2614 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2617 bfd_put_32 (output_bfd, tpoff (info, relocation),
2619 /* Skip R_386_PLT32. */
2623 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2625 unsigned int val, type;
2627 /* IE->LE transition:
2628 Originally it can be one of:
2636 BFD_ASSERT (rel->r_offset >= 1);
2637 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2638 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2641 /* movl foo, %eax. */
2642 bfd_put_8 (output_bfd, 0xb8, contents + rel->r_offset - 1);
2646 BFD_ASSERT (rel->r_offset >= 2);
2647 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2652 BFD_ASSERT ((val & 0xc7) == 0x05);
2653 bfd_put_8 (output_bfd, 0xc7,
2654 contents + rel->r_offset - 2);
2655 bfd_put_8 (output_bfd,
2656 0xc0 | ((val >> 3) & 7),
2657 contents + rel->r_offset - 1);
2661 BFD_ASSERT ((val & 0xc7) == 0x05);
2662 bfd_put_8 (output_bfd, 0x81,
2663 contents + rel->r_offset - 2);
2664 bfd_put_8 (output_bfd,
2665 0xc0 | ((val >> 3) & 7),
2666 contents + rel->r_offset - 1);
2673 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2674 contents + rel->r_offset);
2679 unsigned int val, type;
2681 /* {IE_32,GOTIE}->LE transition:
2682 Originally it can be one of:
2683 subl foo(%reg1), %reg2
2684 movl foo(%reg1), %reg2
2685 addl foo(%reg1), %reg2
2688 movl $foo, %reg2 (6 byte form)
2689 addl $foo, %reg2. */
2690 BFD_ASSERT (rel->r_offset >= 2);
2691 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2692 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2693 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2694 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2698 bfd_put_8 (output_bfd, 0xc7,
2699 contents + rel->r_offset - 2);
2700 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2701 contents + rel->r_offset - 1);
2703 else if (type == 0x2b)
2706 bfd_put_8 (output_bfd, 0x81,
2707 contents + rel->r_offset - 2);
2708 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2709 contents + rel->r_offset - 1);
2711 else if (type == 0x03)
2714 bfd_put_8 (output_bfd, 0x81,
2715 contents + rel->r_offset - 2);
2716 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2717 contents + rel->r_offset - 1);
2721 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2722 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2723 contents + rel->r_offset);
2725 bfd_put_32 (output_bfd, tpoff (info, relocation),
2726 contents + rel->r_offset);
2731 if (htab->sgot == NULL)
2735 off = h->got.offset;
2738 if (local_got_offsets == NULL)
2741 off = local_got_offsets[r_symndx];
2748 Elf_Internal_Rela outrel;
2752 if (htab->srelgot == NULL)
2755 outrel.r_offset = (htab->sgot->output_section->vma
2756 + htab->sgot->output_offset + off);
2758 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2759 if (r_type == R_386_TLS_GD)
2760 dr_type = R_386_TLS_DTPMOD32;
2761 else if (tls_type == GOT_TLS_IE_POS)
2762 dr_type = R_386_TLS_TPOFF;
2764 dr_type = R_386_TLS_TPOFF32;
2765 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2766 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2767 htab->sgot->contents + off);
2768 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2769 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2770 htab->sgot->contents + off);
2772 bfd_put_32 (output_bfd, 0,
2773 htab->sgot->contents + off);
2774 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2775 loc = htab->srelgot->contents;
2776 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2777 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2779 if (r_type == R_386_TLS_GD)
2783 BFD_ASSERT (! unresolved_reloc);
2784 bfd_put_32 (output_bfd,
2785 relocation - dtpoff_base (info),
2786 htab->sgot->contents + off + 4);
2790 bfd_put_32 (output_bfd, 0,
2791 htab->sgot->contents + off + 4);
2792 outrel.r_info = ELF32_R_INFO (indx,
2793 R_386_TLS_DTPOFF32);
2794 outrel.r_offset += 4;
2795 htab->srelgot->reloc_count++;
2796 loc += sizeof (Elf32_External_Rel);
2797 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2800 else if (tls_type == GOT_TLS_IE_BOTH)
2802 bfd_put_32 (output_bfd,
2803 indx == 0 ? relocation - dtpoff_base (info) : 0,
2804 htab->sgot->contents + off + 4);
2805 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2806 outrel.r_offset += 4;
2807 htab->srelgot->reloc_count++;
2808 loc += sizeof (Elf32_External_Rel);
2809 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2815 local_got_offsets[r_symndx] |= 1;
2818 if (off >= (bfd_vma) -2)
2820 if (r_type == ELF32_R_TYPE (rel->r_info))
2822 relocation = htab->sgot->output_offset + off;
2823 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2824 && tls_type == GOT_TLS_IE_BOTH)
2826 if (r_type == R_386_TLS_IE)
2827 relocation += htab->sgot->output_section->vma;
2828 unresolved_reloc = FALSE;
2832 unsigned int val, type;
2835 /* GD->IE transition. */
2836 BFD_ASSERT (rel->r_offset >= 2);
2837 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2838 BFD_ASSERT (type == 0x8d || type == 0x04);
2839 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2840 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2842 BFD_ASSERT (rel + 1 < relend);
2843 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2844 roff = rel->r_offset - 3;
2845 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2848 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2850 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2851 BFD_ASSERT (rel->r_offset >= 3);
2852 BFD_ASSERT (bfd_get_8 (input_bfd,
2853 contents + rel->r_offset - 3)
2855 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2860 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2862 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2863 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2864 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2865 BFD_ASSERT (bfd_get_8 (input_bfd,
2866 contents + rel->r_offset + 9)
2868 roff = rel->r_offset - 2;
2870 memcpy (contents + roff,
2871 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2872 contents[roff + 7] = 0x80 | (val & 7);
2873 /* If foo is used only with foo@gotntpoff(%reg) and
2874 foo@indntpoff, but not with foo@gottpoff(%reg), change
2875 subl $foo@gottpoff(%reg), %eax
2877 addl $foo@gotntpoff(%reg), %eax. */
2878 if (r_type == R_386_TLS_GOTIE)
2880 contents[roff + 6] = 0x03;
2881 if (tls_type == GOT_TLS_IE_BOTH)
2884 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2885 contents + roff + 8);
2886 /* Skip R_386_PLT32. */
2897 /* LD->LE transition:
2899 leal foo(%reg), %eax; call ___tls_get_addr.
2901 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2902 BFD_ASSERT (rel->r_offset >= 2);
2903 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2905 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2906 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2907 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2908 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2910 BFD_ASSERT (rel + 1 < relend);
2911 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2912 memcpy (contents + rel->r_offset - 2,
2913 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2914 /* Skip R_386_PLT32. */
2919 if (htab->sgot == NULL)
2922 off = htab->tls_ldm_got.offset;
2927 Elf_Internal_Rela outrel;
2930 if (htab->srelgot == NULL)
2933 outrel.r_offset = (htab->sgot->output_section->vma
2934 + htab->sgot->output_offset + off);
2936 bfd_put_32 (output_bfd, 0,
2937 htab->sgot->contents + off);
2938 bfd_put_32 (output_bfd, 0,
2939 htab->sgot->contents + off + 4);
2940 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2941 loc = htab->srelgot->contents;
2942 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2943 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2944 htab->tls_ldm_got.offset |= 1;
2946 relocation = htab->sgot->output_offset + off;
2947 unresolved_reloc = FALSE;
2950 case R_386_TLS_LDO_32:
2951 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2952 relocation -= dtpoff_base (info);
2954 /* When converting LDO to LE, we must negate. */
2955 relocation = -tpoff (info, relocation);
2958 case R_386_TLS_LE_32:
2962 Elf_Internal_Rela outrel;
2967 outrel.r_offset = rel->r_offset
2968 + input_section->output_section->vma
2969 + input_section->output_offset;
2970 if (h != NULL && h->dynindx != -1)
2974 if (r_type == R_386_TLS_LE_32)
2975 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2977 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2978 sreloc = elf_section_data (input_section)->sreloc;
2981 loc = sreloc->contents;
2982 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2983 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2986 else if (r_type == R_386_TLS_LE_32)
2987 relocation = dtpoff_base (info) - relocation;
2989 relocation -= dtpoff_base (info);
2991 else if (r_type == R_386_TLS_LE_32)
2992 relocation = tpoff (info, relocation);
2994 relocation = -tpoff (info, relocation);
3001 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3002 because such sections are not SEC_ALLOC and thus ld.so will
3003 not process them. */
3004 if (unresolved_reloc
3005 && !((input_section->flags & SEC_DEBUGGING) != 0
3006 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
3008 (*_bfd_error_handler)
3009 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
3010 bfd_archive_filename (input_bfd),
3011 bfd_get_section_name (input_bfd, input_section),
3012 (long) rel->r_offset,
3013 h->root.root.string);
3017 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3018 contents, rel->r_offset,
3019 relocation, (bfd_vma) 0);
3021 if (r != bfd_reloc_ok)
3026 name = h->root.root.string;
3029 name = bfd_elf_string_from_elf_section (input_bfd,
3030 symtab_hdr->sh_link,
3035 name = bfd_section_name (input_bfd, sec);
3038 if (r == bfd_reloc_overflow)
3040 if (! ((*info->callbacks->reloc_overflow)
3041 (info, name, howto->name, (bfd_vma) 0,
3042 input_bfd, input_section, rel->r_offset)))
3047 (*_bfd_error_handler)
3048 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3049 bfd_archive_filename (input_bfd),
3050 bfd_get_section_name (input_bfd, input_section),
3051 (long) rel->r_offset, name, (int) r);
3060 /* Finish up dynamic symbol handling. We set the contents of various
3061 dynamic sections here. */
3064 elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym)
3066 struct bfd_link_info *info;
3067 struct elf_link_hash_entry *h;
3068 Elf_Internal_Sym *sym;
3070 struct elf_i386_link_hash_table *htab;
3072 htab = elf_i386_hash_table (info);
3074 if (h->plt.offset != (bfd_vma) -1)
3078 Elf_Internal_Rela rel;
3081 /* This symbol has an entry in the procedure linkage table. Set
3084 if (h->dynindx == -1
3085 || htab->splt == NULL
3086 || htab->sgotplt == NULL
3087 || htab->srelplt == NULL)
3090 /* Get the index in the procedure linkage table which
3091 corresponds to this symbol. This is the index of this symbol
3092 in all the symbols for which we are making plt entries. The
3093 first entry in the procedure linkage table is reserved. */
3094 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3096 /* Get the offset into the .got table of the entry that
3097 corresponds to this function. Each .got entry is 4 bytes.
3098 The first three are reserved. */
3099 got_offset = (plt_index + 3) * 4;
3101 /* Fill in the entry in the procedure linkage table. */
3104 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3106 bfd_put_32 (output_bfd,
3107 (htab->sgotplt->output_section->vma
3108 + htab->sgotplt->output_offset
3110 htab->splt->contents + h->plt.offset + 2);
3114 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3116 bfd_put_32 (output_bfd, got_offset,
3117 htab->splt->contents + h->plt.offset + 2);
3120 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3121 htab->splt->contents + h->plt.offset + 7);
3122 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3123 htab->splt->contents + h->plt.offset + 12);
3125 /* Fill in the entry in the global offset table. */
3126 bfd_put_32 (output_bfd,
3127 (htab->splt->output_section->vma
3128 + htab->splt->output_offset
3131 htab->sgotplt->contents + got_offset);
3133 /* Fill in the entry in the .rel.plt section. */
3134 rel.r_offset = (htab->sgotplt->output_section->vma
3135 + htab->sgotplt->output_offset
3137 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3138 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3139 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3141 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3143 /* Mark the symbol as undefined, rather than as defined in
3144 the .plt section. Leave the value alone. This is a clue
3145 for the dynamic linker, to make function pointer
3146 comparisons work between an application and shared
3148 sym->st_shndx = SHN_UNDEF;
3152 if (h->got.offset != (bfd_vma) -1
3153 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3154 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3156 Elf_Internal_Rela rel;
3159 /* This symbol has an entry in the global offset table. Set it
3162 if (htab->sgot == NULL || htab->srelgot == NULL)
3165 rel.r_offset = (htab->sgot->output_section->vma
3166 + htab->sgot->output_offset
3167 + (h->got.offset & ~(bfd_vma) 1));
3169 /* If this is a static link, or it is a -Bsymbolic link and the
3170 symbol is defined locally or was forced to be local because
3171 of a version file, we just want to emit a RELATIVE reloc.
3172 The entry in the global offset table will already have been
3173 initialized in the relocate_section function. */
3177 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
3178 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
3180 BFD_ASSERT((h->got.offset & 1) != 0);
3181 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3185 BFD_ASSERT((h->got.offset & 1) == 0);
3186 bfd_put_32 (output_bfd, (bfd_vma) 0,
3187 htab->sgot->contents + h->got.offset);
3188 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3191 loc = htab->srelgot->contents;
3192 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3193 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3196 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3198 Elf_Internal_Rela rel;
3201 /* This symbol needs a copy reloc. Set it up. */
3203 if (h->dynindx == -1
3204 || (h->root.type != bfd_link_hash_defined
3205 && h->root.type != bfd_link_hash_defweak)
3206 || htab->srelbss == NULL)
3209 rel.r_offset = (h->root.u.def.value
3210 + h->root.u.def.section->output_section->vma
3211 + h->root.u.def.section->output_offset);
3212 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3213 loc = htab->srelbss->contents;
3214 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3215 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3218 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3219 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3220 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3221 sym->st_shndx = SHN_ABS;
3226 /* Used to decide how to sort relocs in an optimal manner for the
3227 dynamic linker, before writing them out. */
3229 static enum elf_reloc_type_class
3230 elf_i386_reloc_type_class (rela)
3231 const Elf_Internal_Rela *rela;
3233 switch ((int) ELF32_R_TYPE (rela->r_info))
3235 case R_386_RELATIVE:
3236 return reloc_class_relative;
3237 case R_386_JUMP_SLOT:
3238 return reloc_class_plt;
3240 return reloc_class_copy;
3242 return reloc_class_normal;
3246 /* Finish up the dynamic sections. */
3249 elf_i386_finish_dynamic_sections (output_bfd, info)
3251 struct bfd_link_info *info;
3253 struct elf_i386_link_hash_table *htab;
3257 htab = elf_i386_hash_table (info);
3258 dynobj = htab->elf.dynobj;
3259 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3261 if (htab->elf.dynamic_sections_created)
3263 Elf32_External_Dyn *dyncon, *dynconend;
3265 if (sdyn == NULL || htab->sgot == NULL)
3268 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3269 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3270 for (; dyncon < dynconend; dyncon++)
3272 Elf_Internal_Dyn dyn;
3275 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3283 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3288 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3293 dyn.d_un.d_val = s->_raw_size;
3297 /* My reading of the SVR4 ABI indicates that the
3298 procedure linkage table relocs (DT_JMPREL) should be
3299 included in the overall relocs (DT_REL). This is
3300 what Solaris does. However, UnixWare can not handle
3301 that case. Therefore, we override the DT_RELSZ entry
3302 here to make it not include the JMPREL relocs. */
3306 dyn.d_un.d_val -= s->_raw_size;
3310 /* We may not be using the standard ELF linker script.
3311 If .rel.plt is the first .rel section, we adjust
3312 DT_REL to not include it. */
3316 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3318 dyn.d_un.d_ptr += s->_raw_size;
3322 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3325 /* Fill in the first entry in the procedure linkage table. */
3326 if (htab->splt && htab->splt->_raw_size > 0)
3329 memcpy (htab->splt->contents,
3330 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3333 memcpy (htab->splt->contents,
3334 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3335 bfd_put_32 (output_bfd,
3336 (htab->sgotplt->output_section->vma
3337 + htab->sgotplt->output_offset
3339 htab->splt->contents + 2);
3340 bfd_put_32 (output_bfd,
3341 (htab->sgotplt->output_section->vma
3342 + htab->sgotplt->output_offset
3344 htab->splt->contents + 8);
3347 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3348 really seem like the right value. */
3349 elf_section_data (htab->splt->output_section)
3350 ->this_hdr.sh_entsize = 4;
3356 /* Fill in the first three entries in the global offset table. */
3357 if (htab->sgotplt->_raw_size > 0)
3359 bfd_put_32 (output_bfd,
3360 (sdyn == NULL ? (bfd_vma) 0
3361 : sdyn->output_section->vma + sdyn->output_offset),
3362 htab->sgotplt->contents);
3363 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3364 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3367 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3372 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3373 #define TARGET_LITTLE_NAME "elf32-i386"
3374 #define ELF_ARCH bfd_arch_i386
3375 #define ELF_MACHINE_CODE EM_386
3376 #define ELF_MAXPAGESIZE 0x1000
3378 #define elf_backend_can_gc_sections 1
3379 #define elf_backend_can_refcount 1
3380 #define elf_backend_want_got_plt 1
3381 #define elf_backend_plt_readonly 1
3382 #define elf_backend_want_plt_sym 0
3383 #define elf_backend_got_header_size 12
3384 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3386 /* Support RELA for objdump of prelink objects. */
3387 #define elf_info_to_howto elf_i386_info_to_howto_rel
3388 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3390 #define bfd_elf32_mkobject elf_i386_mkobject
3391 #define elf_backend_object_p elf_i386_object_p
3393 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3394 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3395 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3397 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3398 #define elf_backend_check_relocs elf_i386_check_relocs
3399 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3400 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3401 #define elf_backend_fake_sections elf_i386_fake_sections
3402 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3403 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3404 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3405 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3406 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3407 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3408 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3409 #define elf_backend_relocate_section elf_i386_relocate_section
3410 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3412 #include "elf32-target.h"
3414 /* FreeBSD support. */
3416 #undef TARGET_LITTLE_SYM
3417 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3418 #undef TARGET_LITTLE_NAME
3419 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3421 /* The kernel recognizes executables as valid only if they carry a
3422 "FreeBSD" label in the ELF header. So we put this label on all
3423 executables and (for simplicity) also all other object files. */
3425 static void elf_i386_post_process_headers
3426 PARAMS ((bfd *, struct bfd_link_info *));
3429 elf_i386_post_process_headers (abfd, link_info)
3431 struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3433 Elf_Internal_Ehdr *i_ehdrp;
3435 i_ehdrp = elf_elfheader (abfd);
3437 /* Put an ABI label supported by FreeBSD >= 4.1. */
3438 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3439 #ifdef OLD_FREEBSD_ABI_LABEL
3440 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3441 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3445 #undef elf_backend_post_process_headers
3446 #define elf_backend_post_process_headers elf_i386_post_process_headers
3448 #define elf32_bed elf32_i386_fbsd_bed
3450 #include "elf32-target.h"