1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2016 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
32 #include "opcode/i386.h"
34 /* 386 uses REL relocations instead of RELA. */
39 static reloc_howto_type elf_howto_table[]=
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
163 FALSE, /* pc_relative */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
171 FALSE), /* pcrel_offset */
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
178 FALSE, /* pc_relative */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
186 FALSE) /* pcrel_offset */
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
192 #ifdef DEBUG_GEN_RELOC
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
393 return &elf_howto_table[indx];
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
399 Elf_Internal_Rela *dst)
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
414 if (name[0] == '.' && name[1] == 'X')
417 return _bfd_elf_is_local_label_name (abfd, name);
420 /* Support for core dump NOTE sections. */
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
430 int pr_version = bfd_get_32 (abfd, note->descdata);
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
443 size = bfd_get_32 (abfd, note->descdata + 8);
447 switch (note->descsz)
452 case 144: /* Linux/i386 */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
477 int pr_version = bfd_get_32 (abfd, note->descdata);
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
489 switch (note->descsz)
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
518 /* Functions for the i386 ELF linker.
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
532 /* The name of the dynamic interpreter. This is put in the .interp
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
541 #define ELIMINATE_COPY_RELOCS 1
543 /* The size in bytes of an entry in the procedure linkage table. */
545 #define PLT_ENTRY_SIZE 16
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
551 static const bfd_byte elf_i386_plt0_entry[12] =
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
559 /* Subsequent entries in an absolute procedure linkage table look like
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
593 /* Entries in the GOT procedure linkage table look like this. */
595 static const bfd_byte elf_i386_got_plt_entry[8] =
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
602 /* Entries in the PIC GOT procedure linkage table look like this. */
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
611 /* .eh_frame covering the .plt section. */
613 static const bfd_byte elf_i386_eh_frame_plt[] =
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
650 struct elf_i386_plt_layout
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
712 /* Architecture-specific backend data for i386. */
714 struct elf_i386_backend_data
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
722 /* True if the target system is VxWorks. */
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
738 #define elf_backend_arch_data &elf_i386_arch_bed
740 /* Is a undefined weak symbol which is resolved to 0. Reference to an
741 undefined weak symbol is resolved to 0 when building executable if
743 1. Has non-GOT/non-PLT relocations in text section. Or
744 2. Has no GOT/PLT relocation.
746 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
747 ((EH)->elf.root.type == bfd_link_hash_undefweak \
748 && bfd_link_executable (INFO) \
749 && (elf_i386_hash_table (INFO)->interp == NULL \
751 || (EH)->has_non_got_reloc \
752 || !(INFO)->dynamic_undefined_weak))
754 /* i386 ELF linker hash entry. */
756 struct elf_i386_link_hash_entry
758 struct elf_link_hash_entry elf;
760 /* Track dynamic relocs copied for this symbol. */
761 struct elf_dyn_relocs *dyn_relocs;
763 #define GOT_UNKNOWN 0
767 #define GOT_TLS_IE_POS 5
768 #define GOT_TLS_IE_NEG 6
769 #define GOT_TLS_IE_BOTH 7
770 #define GOT_TLS_GDESC 8
771 #define GOT_TLS_GD_BOTH_P(type) \
772 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
773 #define GOT_TLS_GD_P(type) \
774 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
775 #define GOT_TLS_GDESC_P(type) \
776 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
777 #define GOT_TLS_GD_ANY_P(type) \
778 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
779 unsigned char tls_type;
781 /* Symbol is referenced by R_386_GOTOFF relocation. */
782 unsigned int gotoff_ref : 1;
784 /* Symbol has GOT or PLT relocations. */
785 unsigned int has_got_reloc : 1;
787 /* Symbol has non-GOT/non-PLT relocations in text sections. */
788 unsigned int has_non_got_reloc : 1;
790 /* 0: symbol isn't ___tls_get_addr.
791 1: symbol is ___tls_get_addr.
792 2: symbol is unknown. */
793 unsigned int tls_get_addr : 2;
795 /* Reference count of C/C++ function pointer relocations in read-write
796 section which can be resolved at run-time. */
797 bfd_signed_vma func_pointer_refcount;
799 /* Information about the GOT PLT entry. Filled when there are both
800 GOT and PLT relocations against the same function. */
801 union gotplt_union plt_got;
803 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
804 starting at the end of the jump table. */
808 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
810 struct elf_i386_obj_tdata
812 struct elf_obj_tdata root;
814 /* tls_type for each local got entry. */
815 char *local_got_tls_type;
817 /* GOTPLT entries for TLS descriptors. */
818 bfd_vma *local_tlsdesc_gotent;
821 #define elf_i386_tdata(abfd) \
822 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
824 #define elf_i386_local_got_tls_type(abfd) \
825 (elf_i386_tdata (abfd)->local_got_tls_type)
827 #define elf_i386_local_tlsdesc_gotent(abfd) \
828 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
830 #define is_i386_elf(bfd) \
831 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
832 && elf_tdata (bfd) != NULL \
833 && elf_object_id (bfd) == I386_ELF_DATA)
836 elf_i386_mkobject (bfd *abfd)
838 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
842 /* i386 ELF linker hash table. */
844 struct elf_i386_link_hash_table
846 struct elf_link_hash_table elf;
848 /* Short-cuts to get to dynamic linker sections. */
852 asection *plt_eh_frame;
857 bfd_signed_vma refcount;
861 /* The amount of space used by the reserved portion of the sgotplt
862 section, plus whatever space is used by the jump slots. */
863 bfd_vma sgotplt_jump_table_size;
865 /* Small local sym cache. */
866 struct sym_cache sym_cache;
868 /* _TLS_MODULE_BASE_ symbol. */
869 struct bfd_link_hash_entry *tls_module_base;
871 /* Used by local STT_GNU_IFUNC symbols. */
872 htab_t loc_hash_table;
873 void * loc_hash_memory;
875 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
878 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
879 bfd_vma next_tls_desc_index;
881 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
882 bfd_vma next_jump_slot_index;
884 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
885 bfd_vma next_irelative_index;
887 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
888 to read-only sections. */
889 bfd_boolean readonly_dynrelocs_against_ifunc;
892 /* Get the i386 ELF linker hash table from a link_info structure. */
894 #define elf_i386_hash_table(p) \
895 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
896 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
898 #define elf_i386_compute_jump_table_size(htab) \
899 ((htab)->elf.srelplt->reloc_count * 4)
901 /* Create an entry in an i386 ELF linker hash table. */
903 static struct bfd_hash_entry *
904 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
905 struct bfd_hash_table *table,
908 /* Allocate the structure if it has not already been allocated by a
912 entry = (struct bfd_hash_entry *)
913 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
918 /* Call the allocation method of the superclass. */
919 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
922 struct elf_i386_link_hash_entry *eh;
924 eh = (struct elf_i386_link_hash_entry *) entry;
925 eh->dyn_relocs = NULL;
926 eh->tls_type = GOT_UNKNOWN;
928 eh->has_got_reloc = 0;
929 eh->has_non_got_reloc = 0;
930 eh->tls_get_addr = 2;
931 eh->func_pointer_refcount = 0;
932 eh->plt_got.offset = (bfd_vma) -1;
933 eh->tlsdesc_got = (bfd_vma) -1;
939 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
940 for local symbol so that we can handle local STT_GNU_IFUNC symbols
941 as global symbol. We reuse indx and dynstr_index for local symbol
942 hash since they aren't used by global symbols in this backend. */
945 elf_i386_local_htab_hash (const void *ptr)
947 struct elf_link_hash_entry *h
948 = (struct elf_link_hash_entry *) ptr;
949 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
952 /* Compare local hash entries. */
955 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
957 struct elf_link_hash_entry *h1
958 = (struct elf_link_hash_entry *) ptr1;
959 struct elf_link_hash_entry *h2
960 = (struct elf_link_hash_entry *) ptr2;
962 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
965 /* Find and/or create a hash entry for local symbol. */
967 static struct elf_link_hash_entry *
968 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
969 bfd *abfd, const Elf_Internal_Rela *rel,
972 struct elf_i386_link_hash_entry e, *ret;
973 asection *sec = abfd->sections;
974 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
975 ELF32_R_SYM (rel->r_info));
978 e.elf.indx = sec->id;
979 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
980 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
981 create ? INSERT : NO_INSERT);
988 ret = (struct elf_i386_link_hash_entry *) *slot;
992 ret = (struct elf_i386_link_hash_entry *)
993 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
994 sizeof (struct elf_i386_link_hash_entry));
997 memset (ret, 0, sizeof (*ret));
998 ret->elf.indx = sec->id;
999 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1000 ret->elf.dynindx = -1;
1001 ret->func_pointer_refcount = 0;
1002 ret->plt_got.offset = (bfd_vma) -1;
1008 /* Destroy an i386 ELF linker hash table. */
1011 elf_i386_link_hash_table_free (bfd *obfd)
1013 struct elf_i386_link_hash_table *htab
1014 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1016 if (htab->loc_hash_table)
1017 htab_delete (htab->loc_hash_table);
1018 if (htab->loc_hash_memory)
1019 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1020 _bfd_elf_link_hash_table_free (obfd);
1023 /* Create an i386 ELF linker hash table. */
1025 static struct bfd_link_hash_table *
1026 elf_i386_link_hash_table_create (bfd *abfd)
1028 struct elf_i386_link_hash_table *ret;
1029 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1031 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1035 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1036 elf_i386_link_hash_newfunc,
1037 sizeof (struct elf_i386_link_hash_entry),
1044 ret->loc_hash_table = htab_try_create (1024,
1045 elf_i386_local_htab_hash,
1046 elf_i386_local_htab_eq,
1048 ret->loc_hash_memory = objalloc_create ();
1049 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1051 elf_i386_link_hash_table_free (abfd);
1054 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1056 return &ret->elf.root;
1059 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1060 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1064 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1066 struct elf_i386_link_hash_table *htab;
1068 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1071 htab = elf_i386_hash_table (info);
1075 /* Set the contents of the .interp section to the interpreter. */
1076 if (bfd_link_executable (info) && !info->nointerp)
1078 asection *s = bfd_get_linker_section (dynobj, ".interp");
1081 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1082 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1086 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1090 if (bfd_link_executable (info))
1092 /* Always allow copy relocs for building executables. */
1093 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1096 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1097 s = bfd_make_section_anyway_with_flags (dynobj,
1099 (bed->dynamic_sec_flags
1102 || ! bfd_set_section_alignment (dynobj, s,
1103 bed->s->log_file_align))
1109 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1110 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1114 if (!info->no_ld_generated_unwind_info
1115 && htab->plt_eh_frame == NULL
1116 && htab->elf.splt != NULL)
1118 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1119 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1120 | SEC_LINKER_CREATED);
1122 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1123 if (htab->plt_eh_frame == NULL
1124 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1131 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1134 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1135 struct elf_link_hash_entry *dir,
1136 struct elf_link_hash_entry *ind)
1138 struct elf_i386_link_hash_entry *edir, *eind;
1140 edir = (struct elf_i386_link_hash_entry *) dir;
1141 eind = (struct elf_i386_link_hash_entry *) ind;
1143 if (eind->dyn_relocs != NULL)
1145 if (edir->dyn_relocs != NULL)
1147 struct elf_dyn_relocs **pp;
1148 struct elf_dyn_relocs *p;
1150 /* Add reloc counts against the indirect sym to the direct sym
1151 list. Merge any entries against the same section. */
1152 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1154 struct elf_dyn_relocs *q;
1156 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1157 if (q->sec == p->sec)
1159 q->pc_count += p->pc_count;
1160 q->count += p->count;
1167 *pp = edir->dyn_relocs;
1170 edir->dyn_relocs = eind->dyn_relocs;
1171 eind->dyn_relocs = NULL;
1174 if (ind->root.type == bfd_link_hash_indirect
1175 && dir->got.refcount <= 0)
1177 edir->tls_type = eind->tls_type;
1178 eind->tls_type = GOT_UNKNOWN;
1181 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1182 generate a R_386_COPY reloc. */
1183 edir->gotoff_ref |= eind->gotoff_ref;
1185 edir->has_got_reloc |= eind->has_got_reloc;
1186 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1188 if (ELIMINATE_COPY_RELOCS
1189 && ind->root.type != bfd_link_hash_indirect
1190 && dir->dynamic_adjusted)
1192 /* If called to transfer flags for a weakdef during processing
1193 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1194 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1195 dir->ref_dynamic |= ind->ref_dynamic;
1196 dir->ref_regular |= ind->ref_regular;
1197 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1198 dir->needs_plt |= ind->needs_plt;
1199 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1203 if (eind->func_pointer_refcount > 0)
1205 edir->func_pointer_refcount += eind->func_pointer_refcount;
1206 eind->func_pointer_refcount = 0;
1209 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1213 /* Return TRUE if the TLS access code sequence support transition
1217 elf_i386_check_tls_transition (asection *sec,
1219 Elf_Internal_Shdr *symtab_hdr,
1220 struct elf_link_hash_entry **sym_hashes,
1221 unsigned int r_type,
1222 const Elf_Internal_Rela *rel,
1223 const Elf_Internal_Rela *relend)
1225 unsigned int val, type, reg;
1226 unsigned long r_symndx;
1227 struct elf_link_hash_entry *h;
1230 bfd_boolean indirect_call, tls_get_addr;
1232 offset = rel->r_offset;
1237 if (offset < 2 || (rel + 1) >= relend)
1240 indirect_call = FALSE;
1241 call = contents + offset + 4;
1244 if (r_type == R_386_TLS_GD)
1246 /* Check transition from GD access model. Only
1247 leal foo@tlsgd(,%ebx,1), %eax
1248 call ___tls_get_addr@PLT
1250 leal foo@tlsgd(%ebx) %eax
1251 call ___tls_get_addr@PLT
1254 leal foo@tlsgd(%reg), %eax
1255 call *___tls_get_addr@GOT(%reg)
1256 which may be converted to
1257 addr32 call ___tls_get_addr
1258 can transit to different access model. */
1259 if ((offset + 10) > sec->size
1260 || (type != 0x8d && type != 0x04))
1265 /* leal foo@tlsgd(,%ebx,1), %eax
1266 call ___tls_get_addr@PLT */
1270 if (*(call - 7) != 0x8d
1278 leal foo@tlsgd(%ebx), %eax
1279 call ___tls_get_addr@PLT
1282 leal foo@tlsgd(%reg), %eax
1283 call *___tls_get_addr@GOT(%reg)
1284 which may be converted to
1285 addr32 call ___tls_get_addr
1287 %eax can't be used as the GOT base register since it
1288 is used to pass parameter to ___tls_get_addr. */
1290 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1293 indirect_call = call[0] == 0xff;
1294 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1295 && !(call[0] == 0x67 && call[1] == 0xe8)
1297 && (call[1] & 0xf8) == 0x90
1298 && (call[1] & 0x7) == reg))
1304 /* Check transition from LD access model. Only
1305 leal foo@tlsldm(%ebx), %eax
1306 call ___tls_get_addr@PLT
1308 leal foo@tlsldm(%reg), %eax
1309 call *___tls_get_addr@GOT(%reg)
1310 which may be converted to
1311 addr32 call ___tls_get_addr
1312 can transit to different access model. */
1313 if (type != 0x8d || (offset + 9) > sec->size)
1316 /* %eax can't be used as the GOT base register since it is
1317 used to pass parameter to ___tls_get_addr. */
1319 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1322 indirect_call = call[0] == 0xff;
1323 if (!(reg == 3 && call[0] == 0xe8)
1324 && !(call[0] == 0x67 && call[1] == 0xe8)
1326 && (call[1] & 0xf8) == 0x90
1327 && (call[1] & 0x7) == reg))
1331 r_symndx = ELF32_R_SYM (rel[1].r_info);
1332 if (r_symndx < symtab_hdr->sh_info)
1335 tls_get_addr = FALSE;
1336 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1337 if (h != NULL && h->root.root.string != NULL)
1339 struct elf_i386_link_hash_entry *eh
1340 = (struct elf_i386_link_hash_entry *) h;
1341 tls_get_addr = eh->tls_get_addr == 1;
1342 if (eh->tls_get_addr > 1)
1344 /* Use strncmp to check ___tls_get_addr since
1345 ___tls_get_addr may be versioned. */
1346 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1349 eh->tls_get_addr = 1;
1350 tls_get_addr = TRUE;
1353 eh->tls_get_addr = 0;
1359 else if (indirect_call)
1360 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1362 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1363 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1366 /* Check transition from IE access model:
1367 movl foo@indntpoff(%rip), %eax
1368 movl foo@indntpoff(%rip), %reg
1369 addl foo@indntpoff(%rip), %reg
1372 if (offset < 1 || (offset + 4) > sec->size)
1375 /* Check "movl foo@tpoff(%rip), %eax" first. */
1376 val = bfd_get_8 (abfd, contents + offset - 1);
1383 /* Check movl|addl foo@tpoff(%rip), %reg. */
1384 type = bfd_get_8 (abfd, contents + offset - 2);
1385 return ((type == 0x8b || type == 0x03)
1386 && (val & 0xc7) == 0x05);
1388 case R_386_TLS_GOTIE:
1389 case R_386_TLS_IE_32:
1390 /* Check transition from {IE_32,GOTIE} access model:
1391 subl foo@{tpoff,gontoff}(%reg1), %reg2
1392 movl foo@{tpoff,gontoff}(%reg1), %reg2
1393 addl foo@{tpoff,gontoff}(%reg1), %reg2
1396 if (offset < 2 || (offset + 4) > sec->size)
1399 val = bfd_get_8 (abfd, contents + offset - 1);
1400 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1403 type = bfd_get_8 (abfd, contents + offset - 2);
1404 return type == 0x8b || type == 0x2b || type == 0x03;
1406 case R_386_TLS_GOTDESC:
1407 /* Check transition from GDesc access model:
1408 leal x@tlsdesc(%ebx), %eax
1410 Make sure it's a leal adding ebx to a 32-bit offset
1411 into any register, although it's probably almost always
1414 if (offset < 2 || (offset + 4) > sec->size)
1417 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1420 val = bfd_get_8 (abfd, contents + offset - 1);
1421 return (val & 0xc7) == 0x83;
1423 case R_386_TLS_DESC_CALL:
1424 /* Check transition from GDesc access model:
1425 call *x@tlsdesc(%eax)
1427 if (offset + 2 <= sec->size)
1429 /* Make sure that it's a call *x@tlsdesc(%eax). */
1430 call = contents + offset;
1431 return call[0] == 0xff && call[1] == 0x10;
1441 /* Return TRUE if the TLS access transition is OK or no transition
1442 will be performed. Update R_TYPE if there is a transition. */
1445 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1446 asection *sec, bfd_byte *contents,
1447 Elf_Internal_Shdr *symtab_hdr,
1448 struct elf_link_hash_entry **sym_hashes,
1449 unsigned int *r_type, int tls_type,
1450 const Elf_Internal_Rela *rel,
1451 const Elf_Internal_Rela *relend,
1452 struct elf_link_hash_entry *h,
1453 unsigned long r_symndx,
1454 bfd_boolean from_relocate_section)
1456 unsigned int from_type = *r_type;
1457 unsigned int to_type = from_type;
1458 bfd_boolean check = TRUE;
1460 /* Skip TLS transition for functions. */
1462 && (h->type == STT_FUNC
1463 || h->type == STT_GNU_IFUNC))
1469 case R_386_TLS_GOTDESC:
1470 case R_386_TLS_DESC_CALL:
1471 case R_386_TLS_IE_32:
1473 case R_386_TLS_GOTIE:
1474 if (bfd_link_executable (info))
1477 to_type = R_386_TLS_LE_32;
1478 else if (from_type != R_386_TLS_IE
1479 && from_type != R_386_TLS_GOTIE)
1480 to_type = R_386_TLS_IE_32;
1483 /* When we are called from elf_i386_relocate_section, there may
1484 be additional transitions based on TLS_TYPE. */
1485 if (from_relocate_section)
1487 unsigned int new_to_type = to_type;
1489 if (bfd_link_executable (info)
1492 && (tls_type & GOT_TLS_IE))
1493 new_to_type = R_386_TLS_LE_32;
1495 if (to_type == R_386_TLS_GD
1496 || to_type == R_386_TLS_GOTDESC
1497 || to_type == R_386_TLS_DESC_CALL)
1499 if (tls_type == GOT_TLS_IE_POS)
1500 new_to_type = R_386_TLS_GOTIE;
1501 else if (tls_type & GOT_TLS_IE)
1502 new_to_type = R_386_TLS_IE_32;
1505 /* We checked the transition before when we were called from
1506 elf_i386_check_relocs. We only want to check the new
1507 transition which hasn't been checked before. */
1508 check = new_to_type != to_type && from_type == to_type;
1509 to_type = new_to_type;
1515 if (bfd_link_executable (info))
1516 to_type = R_386_TLS_LE_32;
1523 /* Return TRUE if there is no transition. */
1524 if (from_type == to_type)
1527 /* Check if the transition can be performed. */
1529 && ! elf_i386_check_tls_transition (sec, contents,
1530 symtab_hdr, sym_hashes,
1531 from_type, rel, relend))
1533 reloc_howto_type *from, *to;
1536 from = elf_i386_rtype_to_howto (abfd, from_type);
1537 to = elf_i386_rtype_to_howto (abfd, to_type);
1540 name = h->root.root.string;
1543 struct elf_i386_link_hash_table *htab;
1545 htab = elf_i386_hash_table (info);
1550 Elf_Internal_Sym *isym;
1552 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1554 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1558 (*_bfd_error_handler)
1559 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1560 "in section `%A' failed"),
1561 abfd, sec, from->name, to->name, name,
1562 (unsigned long) rel->r_offset);
1563 bfd_set_error (bfd_error_bad_value);
1571 /* With the local symbol, foo, we convert
1572 mov foo@GOT[(%reg1)], %reg2
1574 lea foo[@GOTOFF(%reg1)], %reg2
1576 call/jmp *foo@GOT[(%reg)]
1578 nop call foo/jmp foo nop
1579 When PIC is false, convert
1580 test %reg1, foo@GOT[(%reg2)]
1584 binop foo@GOT[(%reg1)], %reg2
1587 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1592 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1594 Elf_Internal_Rela *irel,
1595 struct elf_link_hash_entry *h,
1596 bfd_boolean *converted,
1597 struct bfd_link_info *link_info)
1599 struct elf_i386_link_hash_table *htab;
1600 unsigned int opcode;
1602 bfd_boolean baseless;
1603 Elf_Internal_Sym *isym;
1604 unsigned int addend;
1608 bfd_boolean to_reloc_32;
1609 unsigned int r_type;
1610 unsigned int r_symndx;
1611 bfd_vma roff = irel->r_offset;
1616 /* Addend for R_386_GOT32X relocations must be 0. */
1617 addend = bfd_get_32 (abfd, contents + roff);
1621 htab = elf_i386_hash_table (link_info);
1622 is_pic = bfd_link_pic (link_info);
1624 r_type = ELF32_R_TYPE (irel->r_info);
1625 r_symndx = ELF32_R_SYM (irel->r_info);
1627 modrm = bfd_get_8 (abfd, contents + roff - 1);
1628 baseless = (modrm & 0xc7) == 0x5;
1630 if (baseless && is_pic)
1632 /* For PIC, disallow R_386_GOT32X without a base register
1633 since we don't know what the GOT base is. */
1638 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1640 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1643 name = h->root.root.string;
1645 (*_bfd_error_handler)
1646 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
1651 opcode = bfd_get_8 (abfd, contents + roff - 2);
1653 /* Convert to R_386_32 if PIC is false or there is no base
1655 to_reloc_32 = !is_pic || baseless;
1657 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1661 if (opcode == 0x0ff)
1662 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1663 goto convert_branch;
1665 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1666 "test %reg1, foo@GOT(%reg2)" and
1667 "binop foo@GOT[(%reg1)], %reg2". */
1671 /* Undefined weak symbol is only bound locally in executable
1672 and its reference is resolved as 0. */
1673 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1674 elf_i386_hash_entry (h)))
1678 /* No direct branch to 0 for PIC. */
1682 goto convert_branch;
1686 /* We can convert load of address 0 to R_386_32. */
1694 /* We have "call/jmp *foo@GOT[(%reg)]". */
1695 if ((h->root.type == bfd_link_hash_defined
1696 || h->root.type == bfd_link_hash_defweak)
1697 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1699 /* The function is locally defined. */
1701 /* Convert R_386_GOT32X to R_386_PC32. */
1702 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1704 struct elf_i386_link_hash_entry *eh
1705 = (struct elf_i386_link_hash_entry *) h;
1707 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1710 /* To support TLS optimization, always use addr32 prefix
1711 for "call *___tls_get_addr@GOT(%reg)". */
1712 if (eh && eh->tls_get_addr == 1)
1715 nop_offset = irel->r_offset - 2;
1719 nop = link_info->call_nop_byte;
1720 if (link_info->call_nop_as_suffix)
1722 nop_offset = roff + 3;
1723 irel->r_offset -= 1;
1726 nop_offset = roff - 2;
1731 /* Convert to "jmp foo nop". */
1734 nop_offset = roff + 3;
1735 irel->r_offset -= 1;
1738 bfd_put_8 (abfd, nop, contents + nop_offset);
1739 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1740 /* When converting to PC-relative relocation, we
1741 need to adjust addend by -4. */
1742 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1743 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1750 /* We have "mov foo@GOT[(%re1g)], %reg2",
1751 "test %reg1, foo@GOT(%reg2)" and
1752 "binop foo@GOT[(%reg1)], %reg2".
1754 Avoid optimizing _DYNAMIC since ld.so may use its
1755 link-time address. */
1756 if (h == htab->elf.hdynamic)
1759 /* def_regular is set by an assignment in a linker script in
1760 bfd_elf_record_link_assignment. */
1762 || h->root.type == bfd_link_hash_defined
1763 || h->root.type == bfd_link_hash_defweak)
1764 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1771 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1772 "mov $foo, %reg2" with R_386_32. */
1774 modrm = 0xc0 | (modrm & 0x38) >> 3;
1775 bfd_put_8 (abfd, modrm, contents + roff - 1);
1780 /* Convert "mov foo@GOT(%reg1), %reg2" to
1781 "lea foo@GOTOFF(%reg1), %reg2". */
1782 r_type = R_386_GOTOFF;
1788 /* Only R_386_32 is supported. */
1794 /* Convert "test %reg1, foo@GOT(%reg2)" to
1795 "test $foo, %reg1". */
1796 modrm = 0xc0 | (modrm & 0x38) >> 3;
1801 /* Convert "binop foo@GOT(%reg1), %reg2" to
1802 "binop $foo, %reg2". */
1804 | (modrm & 0x38) >> 3
1808 bfd_put_8 (abfd, modrm, contents + roff - 1);
1812 bfd_put_8 (abfd, opcode, contents + roff - 2);
1813 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1822 /* Rename some of the generic section flags to better document how they
1824 #define need_convert_load sec_flg0
1825 #define check_relocs_failed sec_flg1
1827 /* Look through the relocs for a section during the first phase, and
1828 calculate needed space in the global offset table, procedure linkage
1829 table, and dynamic reloc sections. */
1832 elf_i386_check_relocs (bfd *abfd,
1833 struct bfd_link_info *info,
1835 const Elf_Internal_Rela *relocs)
1837 struct elf_i386_link_hash_table *htab;
1838 Elf_Internal_Shdr *symtab_hdr;
1839 struct elf_link_hash_entry **sym_hashes;
1840 const Elf_Internal_Rela *rel;
1841 const Elf_Internal_Rela *rel_end;
1844 bfd_boolean use_plt_got;
1846 if (bfd_link_relocatable (info))
1849 BFD_ASSERT (is_i386_elf (abfd));
1851 htab = elf_i386_hash_table (info);
1854 sec->check_relocs_failed = 1;
1858 /* Get the section contents. */
1859 if (elf_section_data (sec)->this_hdr.contents != NULL)
1860 contents = elf_section_data (sec)->this_hdr.contents;
1861 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1863 sec->check_relocs_failed = 1;
1867 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1868 && (get_elf_i386_backend_data (abfd)
1869 == &elf_i386_arch_bed));
1871 symtab_hdr = &elf_symtab_hdr (abfd);
1872 sym_hashes = elf_sym_hashes (abfd);
1876 rel_end = relocs + sec->reloc_count;
1877 for (rel = relocs; rel < rel_end; rel++)
1879 unsigned int r_type;
1880 unsigned long r_symndx;
1881 struct elf_link_hash_entry *h;
1882 struct elf_i386_link_hash_entry *eh;
1883 Elf_Internal_Sym *isym;
1885 bfd_boolean size_reloc;
1887 r_symndx = ELF32_R_SYM (rel->r_info);
1888 r_type = ELF32_R_TYPE (rel->r_info);
1890 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1892 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1898 if (r_symndx < symtab_hdr->sh_info)
1900 /* A local symbol. */
1901 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1906 /* Check relocation against local STT_GNU_IFUNC symbol. */
1907 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1909 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1913 /* Fake a STT_GNU_IFUNC symbol. */
1914 h->type = STT_GNU_IFUNC;
1917 h->forced_local = 1;
1918 h->root.type = bfd_link_hash_defined;
1926 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1927 while (h->root.type == bfd_link_hash_indirect
1928 || h->root.type == bfd_link_hash_warning)
1929 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1932 eh = (struct elf_i386_link_hash_entry *) h;
1947 if (htab->elf.dynobj == NULL)
1948 htab->elf.dynobj = abfd;
1949 /* Create the ifunc sections for static executables. */
1950 if (h->type == STT_GNU_IFUNC
1951 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
1957 /* It is referenced by a non-shared object. */
1959 h->root.non_ir_ref = 1;
1961 if (h->type == STT_GNU_IFUNC)
1962 elf_tdata (info->output_bfd)->has_gnu_symbols
1963 |= elf_gnu_symbol_ifunc;
1966 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1967 symtab_hdr, sym_hashes,
1968 &r_type, GOT_UNKNOWN,
1969 rel, rel_end, h, r_symndx, FALSE))
1975 htab->tls_ldm_got.refcount += 1;
1979 /* This symbol requires a procedure linkage table entry. We
1980 actually build the entry in adjust_dynamic_symbol,
1981 because this might be a case of linking PIC code which is
1982 never referenced by a dynamic object, in which case we
1983 don't need to generate a procedure linkage table entry
1986 /* If this is a local symbol, we resolve it directly without
1987 creating a procedure linkage table entry. */
1991 eh->has_got_reloc = 1;
1993 h->plt.refcount += 1;
2000 case R_386_TLS_IE_32:
2002 case R_386_TLS_GOTIE:
2003 if (!bfd_link_executable (info))
2004 info->flags |= DF_STATIC_TLS;
2010 case R_386_TLS_GOTDESC:
2011 case R_386_TLS_DESC_CALL:
2012 /* This symbol requires a global offset table entry. */
2014 int tls_type, old_tls_type;
2021 tls_type = GOT_NORMAL;
2023 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2024 case R_386_TLS_GOTDESC:
2025 case R_386_TLS_DESC_CALL:
2026 tls_type = GOT_TLS_GDESC; break;
2027 case R_386_TLS_IE_32:
2028 if (ELF32_R_TYPE (rel->r_info) == r_type)
2029 tls_type = GOT_TLS_IE_NEG;
2031 /* If this is a GD->IE transition, we may use either of
2032 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2033 tls_type = GOT_TLS_IE;
2036 case R_386_TLS_GOTIE:
2037 tls_type = GOT_TLS_IE_POS; break;
2042 h->got.refcount += 1;
2043 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2047 bfd_signed_vma *local_got_refcounts;
2049 /* This is a global offset table entry for a local symbol. */
2050 local_got_refcounts = elf_local_got_refcounts (abfd);
2051 if (local_got_refcounts == NULL)
2055 size = symtab_hdr->sh_info;
2056 size *= (sizeof (bfd_signed_vma)
2057 + sizeof (bfd_vma) + sizeof(char));
2058 local_got_refcounts = (bfd_signed_vma *)
2059 bfd_zalloc (abfd, size);
2060 if (local_got_refcounts == NULL)
2062 elf_local_got_refcounts (abfd) = local_got_refcounts;
2063 elf_i386_local_tlsdesc_gotent (abfd)
2064 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2065 elf_i386_local_got_tls_type (abfd)
2066 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2068 local_got_refcounts[r_symndx] += 1;
2069 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2072 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2073 tls_type |= old_tls_type;
2074 /* If a TLS symbol is accessed using IE at least once,
2075 there is no point to use dynamic model for it. */
2076 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2077 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2078 || (tls_type & GOT_TLS_IE) == 0))
2080 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2081 tls_type = old_tls_type;
2082 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2083 && GOT_TLS_GD_ANY_P (tls_type))
2084 tls_type |= old_tls_type;
2088 name = h->root.root.string;
2090 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2092 (*_bfd_error_handler)
2093 (_("%B: `%s' accessed both as normal and "
2094 "thread local symbol"),
2096 bfd_set_error (bfd_error_bad_value);
2101 if (old_tls_type != tls_type)
2104 elf_i386_hash_entry (h)->tls_type = tls_type;
2106 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2114 if (htab->elf.sgot == NULL)
2116 if (htab->elf.dynobj == NULL)
2117 htab->elf.dynobj = abfd;
2118 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
2121 if (r_type != R_386_TLS_IE)
2124 eh->has_got_reloc = 1;
2129 case R_386_TLS_LE_32:
2132 eh->has_got_reloc = 1;
2133 if (bfd_link_executable (info))
2135 info->flags |= DF_STATIC_TLS;
2140 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2141 eh->has_non_got_reloc = 1;
2143 /* STT_GNU_IFUNC symbol must go through PLT even if it is
2144 locally defined and undefined symbol may turn out to be
2145 a STT_GNU_IFUNC symbol later. */
2147 && (bfd_link_executable (info)
2148 || ((h->type == STT_GNU_IFUNC
2149 || h->root.type == bfd_link_hash_undefweak
2150 || h->root.type == bfd_link_hash_undefined)
2151 && SYMBOLIC_BIND (info, h))))
2153 /* If this reloc is in a read-only section, we might
2154 need a copy reloc. We can't check reliably at this
2155 stage whether the section is read-only, as input
2156 sections have not yet been mapped to output sections.
2157 Tentatively set the flag for now, and correct in
2158 adjust_dynamic_symbol. */
2161 /* We may need a .plt entry if the function this reloc
2162 refers to is in a shared lib. */
2163 h->plt.refcount += 1;
2164 if (r_type == R_386_PC32)
2166 /* Since something like ".long foo - ." may be used
2167 as pointer, make sure that PLT is used if foo is
2168 a function defined in a shared library. */
2169 if ((sec->flags & SEC_CODE) == 0)
2170 h->pointer_equality_needed = 1;
2174 h->pointer_equality_needed = 1;
2175 /* R_386_32 can be resolved at run-time. */
2176 if (r_type == R_386_32
2177 && (sec->flags & SEC_READONLY) == 0)
2178 eh->func_pointer_refcount += 1;
2184 /* If we are creating a shared library, and this is a reloc
2185 against a global symbol, or a non PC relative reloc
2186 against a local symbol, then we need to copy the reloc
2187 into the shared library. However, if we are linking with
2188 -Bsymbolic, we do not need to copy a reloc against a
2189 global symbol which is defined in an object we are
2190 including in the link (i.e., DEF_REGULAR is set). At
2191 this point we have not seen all the input files, so it is
2192 possible that DEF_REGULAR is not set now but will be set
2193 later (it is never cleared). In case of a weak definition,
2194 DEF_REGULAR may be cleared later by a strong definition in
2195 a shared library. We account for that possibility below by
2196 storing information in the relocs_copied field of the hash
2197 table entry. A similar situation occurs when creating
2198 shared libraries and symbol visibility changes render the
2201 If on the other hand, we are creating an executable, we
2202 may need to keep relocations for symbols satisfied by a
2203 dynamic library if we manage to avoid copy relocs for the
2205 if ((sec->flags & SEC_ALLOC) != 0
2206 && ((bfd_link_pic (info)
2207 && (r_type != R_386_PC32
2209 && (! (bfd_link_pie (info)
2210 || SYMBOLIC_BIND (info, h))
2211 || h->root.type == bfd_link_hash_defweak
2212 || !h->def_regular))))
2213 || (ELIMINATE_COPY_RELOCS
2214 && !bfd_link_pic (info)
2216 && (h->root.type == bfd_link_hash_defweak
2217 || !h->def_regular))))
2219 struct elf_dyn_relocs *p;
2220 struct elf_dyn_relocs **head;
2222 /* We must copy these reloc types into the output file.
2223 Create a reloc section in dynobj and make room for
2227 if (htab->elf.dynobj == NULL)
2228 htab->elf.dynobj = abfd;
2230 sreloc = _bfd_elf_make_dynamic_reloc_section
2231 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2237 /* If this is a global symbol, we count the number of
2238 relocations we need for this symbol. */
2241 head = &eh->dyn_relocs;
2245 /* Track dynamic relocs needed for local syms too.
2246 We really need local syms available to do this
2251 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2256 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2260 vpp = &elf_section_data (s)->local_dynrel;
2261 head = (struct elf_dyn_relocs **)vpp;
2265 if (p == NULL || p->sec != sec)
2267 bfd_size_type amt = sizeof *p;
2268 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2280 /* Count size relocation as PC-relative relocation. */
2281 if (r_type == R_386_PC32 || size_reloc)
2286 /* This relocation describes the C++ object vtable hierarchy.
2287 Reconstruct it for later use during GC. */
2288 case R_386_GNU_VTINHERIT:
2289 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2293 /* This relocation describes which C++ vtable entries are actually
2294 used. Record for later use during GC. */
2295 case R_386_GNU_VTENTRY:
2296 BFD_ASSERT (h != NULL);
2298 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2308 && h->plt.refcount > 0
2309 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2310 || h->got.refcount > 0)
2311 && htab->plt_got == NULL)
2313 /* Create the GOT procedure linkage table. */
2314 unsigned int plt_got_align;
2315 const struct elf_backend_data *bed;
2317 bed = get_elf_backend_data (info->output_bfd);
2318 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
2319 && (sizeof (elf_i386_got_plt_entry)
2320 == sizeof (elf_i386_pic_got_plt_entry)));
2323 if (htab->elf.dynobj == NULL)
2324 htab->elf.dynobj = abfd;
2326 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2328 (bed->dynamic_sec_flags
2333 if (htab->plt_got == NULL
2334 || !bfd_set_section_alignment (htab->elf.dynobj,
2340 if (r_type == R_386_GOT32X
2341 && (h == NULL || h->type != STT_GNU_IFUNC))
2342 sec->need_convert_load = 1;
2345 if (elf_section_data (sec)->this_hdr.contents != contents)
2347 if (!info->keep_memory)
2351 /* Cache the section contents for elf_link_input_bfd. */
2352 elf_section_data (sec)->this_hdr.contents = contents;
2359 if (elf_section_data (sec)->this_hdr.contents != contents)
2361 sec->check_relocs_failed = 1;
2365 /* Return the section that should be marked against GC for a given
2369 elf_i386_gc_mark_hook (asection *sec,
2370 struct bfd_link_info *info,
2371 Elf_Internal_Rela *rel,
2372 struct elf_link_hash_entry *h,
2373 Elf_Internal_Sym *sym)
2376 switch (ELF32_R_TYPE (rel->r_info))
2378 case R_386_GNU_VTINHERIT:
2379 case R_386_GNU_VTENTRY:
2383 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2386 /* Remove undefined weak symbol from the dynamic symbol table if it
2387 is resolved to 0. */
2390 elf_i386_fixup_symbol (struct bfd_link_info *info,
2391 struct elf_link_hash_entry *h)
2393 if (h->dynindx != -1
2394 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2395 elf_i386_hash_entry (h)->has_got_reloc,
2396 elf_i386_hash_entry (h)))
2399 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2405 /* Adjust a symbol defined by a dynamic object and referenced by a
2406 regular object. The current definition is in some section of the
2407 dynamic object, but we're not including those sections. We have to
2408 change the definition to something the rest of the link can
2412 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2413 struct elf_link_hash_entry *h)
2415 struct elf_i386_link_hash_table *htab;
2417 struct elf_i386_link_hash_entry *eh;
2418 struct elf_dyn_relocs *p;
2420 /* STT_GNU_IFUNC symbol must go through PLT. */
2421 if (h->type == STT_GNU_IFUNC)
2423 /* All local STT_GNU_IFUNC references must be treate as local
2424 calls via local PLT. */
2426 && SYMBOL_CALLS_LOCAL (info, h))
2428 bfd_size_type pc_count = 0, count = 0;
2429 struct elf_dyn_relocs **pp;
2431 eh = (struct elf_i386_link_hash_entry *) h;
2432 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2434 pc_count += p->pc_count;
2435 p->count -= p->pc_count;
2444 if (pc_count || count)
2448 if (h->plt.refcount <= 0)
2449 h->plt.refcount = 1;
2451 h->plt.refcount += 1;
2455 if (h->plt.refcount <= 0)
2457 h->plt.offset = (bfd_vma) -1;
2463 /* If this is a function, put it in the procedure linkage table. We
2464 will fill in the contents of the procedure linkage table later,
2465 when we know the address of the .got section. */
2466 if (h->type == STT_FUNC
2469 if (h->plt.refcount <= 0
2470 || SYMBOL_CALLS_LOCAL (info, h)
2471 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2472 && h->root.type == bfd_link_hash_undefweak))
2474 /* This case can occur if we saw a PLT32 reloc in an input
2475 file, but the symbol was never referred to by a dynamic
2476 object, or if all references were garbage collected. In
2477 such a case, we don't actually need to build a procedure
2478 linkage table, and we can just do a PC32 reloc instead. */
2479 h->plt.offset = (bfd_vma) -1;
2486 /* It's possible that we incorrectly decided a .plt reloc was
2487 needed for an R_386_PC32 reloc to a non-function sym in
2488 check_relocs. We can't decide accurately between function and
2489 non-function syms in check-relocs; Objects loaded later in
2490 the link may change h->type. So fix it now. */
2491 h->plt.offset = (bfd_vma) -1;
2493 /* If this is a weak symbol, and there is a real definition, the
2494 processor independent code will have arranged for us to see the
2495 real definition first, and we can just use the same value. */
2496 if (h->u.weakdef != NULL)
2498 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2499 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2500 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2501 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2502 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2503 h->non_got_ref = h->u.weakdef->non_got_ref;
2507 /* This is a reference to a symbol defined by a dynamic object which
2508 is not a function. */
2510 /* If we are creating a shared library, we must presume that the
2511 only references to the symbol are via the global offset table.
2512 For such cases we need not do anything here; the relocations will
2513 be handled correctly by relocate_section. */
2514 if (!bfd_link_executable (info))
2517 /* If there are no references to this symbol that do not use the
2518 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2520 eh = (struct elf_i386_link_hash_entry *) h;
2521 if (!h->non_got_ref && !eh->gotoff_ref)
2524 /* If -z nocopyreloc was given, we won't generate them either. */
2525 if (info->nocopyreloc)
2531 htab = elf_i386_hash_table (info);
2535 /* If there aren't any dynamic relocs in read-only sections nor
2536 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2537 avoid the copy reloc. This doesn't work on VxWorks, where we can
2538 not have dynamic relocations (other than copy and jump slot
2539 relocations) in an executable. */
2540 if (ELIMINATE_COPY_RELOCS
2542 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2544 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2546 s = p->sec->output_section;
2547 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2558 /* We must allocate the symbol in our .dynbss section, which will
2559 become part of the .bss section of the executable. There will be
2560 an entry for this symbol in the .dynsym section. The dynamic
2561 object will contain position independent code, so all references
2562 from the dynamic object to this symbol will go through the global
2563 offset table. The dynamic linker will use the .dynsym entry to
2564 determine the address it must put in the global offset table, so
2565 both the dynamic object and the regular object will refer to the
2566 same memory location for the variable. */
2568 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2569 copy the initial value out of the dynamic object and into the
2570 runtime process image. */
2571 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2573 htab->srelbss->size += sizeof (Elf32_External_Rel);
2579 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2582 /* Allocate space in .plt, .got and associated reloc sections for
2586 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2588 struct bfd_link_info *info;
2589 struct elf_i386_link_hash_table *htab;
2590 struct elf_i386_link_hash_entry *eh;
2591 struct elf_dyn_relocs *p;
2592 unsigned plt_entry_size;
2593 bfd_boolean resolved_to_zero;
2595 if (h->root.type == bfd_link_hash_indirect)
2598 eh = (struct elf_i386_link_hash_entry *) h;
2600 info = (struct bfd_link_info *) inf;
2601 htab = elf_i386_hash_table (info);
2605 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2607 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2611 /* Clear the reference count of function pointer relocations if
2612 symbol isn't a normal function. */
2613 if (h->type != STT_FUNC)
2614 eh->func_pointer_refcount = 0;
2616 /* We can't use the GOT PLT if pointer equality is needed since
2617 finish_dynamic_symbol won't clear symbol value and the dynamic
2618 linker won't update the GOT slot. We will get into an infinite
2619 loop at run-time. */
2620 if (htab->plt_got != NULL
2621 && h->type != STT_GNU_IFUNC
2622 && !h->pointer_equality_needed
2623 && h->plt.refcount > 0
2624 && h->got.refcount > 0)
2626 /* Don't use the regular PLT if there are both GOT and GOTPLT
2628 h->plt.offset = (bfd_vma) -1;
2630 /* Use the GOT PLT. */
2631 eh->plt_got.refcount = 1;
2634 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2635 here if it is defined and referenced in a non-shared object. */
2636 if (h->type == STT_GNU_IFUNC
2638 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2639 &htab->readonly_dynrelocs_against_ifunc,
2642 /* Don't create the PLT entry if there are only function pointer
2643 relocations which can be resolved at run-time. */
2644 else if (htab->elf.dynamic_sections_created
2645 && (h->plt.refcount > eh->func_pointer_refcount
2646 || eh->plt_got.refcount > 0))
2648 bfd_boolean use_plt_got;
2650 /* Clear the reference count of function pointer relocations
2652 eh->func_pointer_refcount = 0;
2654 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2656 /* Don't use the regular PLT for DF_BIND_NOW. */
2657 h->plt.offset = (bfd_vma) -1;
2659 /* Use the GOT PLT. */
2660 h->got.refcount = 1;
2661 eh->plt_got.refcount = 1;
2664 use_plt_got = eh->plt_got.refcount > 0;
2666 /* Make sure this symbol is output as a dynamic symbol.
2667 Undefined weak syms won't yet be marked as dynamic. */
2668 if (h->dynindx == -1
2670 && !resolved_to_zero)
2672 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2676 if (bfd_link_pic (info)
2677 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2679 asection *s = htab->elf.splt;
2680 asection *got_s = htab->plt_got;
2682 /* If this is the first .plt entry, make room for the special
2683 first entry. The .plt section is used by prelink to undo
2684 prelinking for dynamic relocations. */
2686 s->size = plt_entry_size;
2689 eh->plt_got.offset = got_s->size;
2691 h->plt.offset = s->size;
2693 /* If this symbol is not defined in a regular file, and we are
2694 not generating a shared library, then set the symbol to this
2695 location in the .plt. This is required to make function
2696 pointers compare as equal between the normal executable and
2697 the shared library. */
2698 if (! bfd_link_pic (info)
2703 /* We need to make a call to the entry of the GOT PLT
2704 instead of regular PLT entry. */
2705 h->root.u.def.section = got_s;
2706 h->root.u.def.value = eh->plt_got.offset;
2710 h->root.u.def.section = s;
2711 h->root.u.def.value = h->plt.offset;
2715 /* Make room for this entry. */
2717 got_s->size += sizeof (elf_i386_got_plt_entry);
2720 s->size += plt_entry_size;
2722 /* We also need to make an entry in the .got.plt section,
2723 which will be placed in the .got section by the linker
2725 htab->elf.sgotplt->size += 4;
2727 /* There should be no PLT relocation against resolved
2728 undefined weak symbol in executable. */
2729 if (!resolved_to_zero)
2731 /* We also need to make an entry in the .rel.plt
2733 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2734 htab->elf.srelplt->reloc_count++;
2738 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2739 && !bfd_link_pic (info))
2741 /* VxWorks has a second set of relocations for each PLT entry
2742 in executables. They go in a separate relocation section,
2743 which is processed by the kernel loader. */
2745 /* There are two relocations for the initial PLT entry: an
2746 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2747 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2749 if (h->plt.offset == plt_entry_size)
2750 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2752 /* There are two extra relocations for each subsequent PLT entry:
2753 an R_386_32 relocation for the GOT entry, and an R_386_32
2754 relocation for the PLT entry. */
2756 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2761 eh->plt_got.offset = (bfd_vma) -1;
2762 h->plt.offset = (bfd_vma) -1;
2768 eh->plt_got.offset = (bfd_vma) -1;
2769 h->plt.offset = (bfd_vma) -1;
2773 eh->tlsdesc_got = (bfd_vma) -1;
2775 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2776 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2777 if (h->got.refcount > 0
2778 && bfd_link_executable (info)
2780 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2781 h->got.offset = (bfd_vma) -1;
2782 else if (h->got.refcount > 0)
2786 int tls_type = elf_i386_hash_entry(h)->tls_type;
2788 /* Make sure this symbol is output as a dynamic symbol.
2789 Undefined weak syms won't yet be marked as dynamic. */
2790 if (h->dynindx == -1
2792 && !resolved_to_zero)
2794 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2799 if (GOT_TLS_GDESC_P (tls_type))
2801 eh->tlsdesc_got = htab->elf.sgotplt->size
2802 - elf_i386_compute_jump_table_size (htab);
2803 htab->elf.sgotplt->size += 8;
2804 h->got.offset = (bfd_vma) -2;
2806 if (! GOT_TLS_GDESC_P (tls_type)
2807 || GOT_TLS_GD_P (tls_type))
2809 h->got.offset = s->size;
2811 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2812 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2815 dyn = htab->elf.dynamic_sections_created;
2816 /* R_386_TLS_IE_32 needs one dynamic relocation,
2817 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2818 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2819 need two), R_386_TLS_GD needs one if local symbol and two if
2820 global. No dynamic relocation against resolved undefined weak
2821 symbol in executable. */
2822 if (tls_type == GOT_TLS_IE_BOTH)
2823 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2824 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2825 || (tls_type & GOT_TLS_IE))
2826 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2827 else if (GOT_TLS_GD_P (tls_type))
2828 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2829 else if (! GOT_TLS_GDESC_P (tls_type)
2830 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2831 && !resolved_to_zero)
2832 || h->root.type != bfd_link_hash_undefweak)
2833 && (bfd_link_pic (info)
2834 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2835 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2836 if (GOT_TLS_GDESC_P (tls_type))
2837 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2840 h->got.offset = (bfd_vma) -1;
2842 if (eh->dyn_relocs == NULL)
2845 /* In the shared -Bsymbolic case, discard space allocated for
2846 dynamic pc-relative relocs against symbols which turn out to be
2847 defined in regular objects. For the normal shared case, discard
2848 space for pc-relative relocs that have become local due to symbol
2849 visibility changes. */
2851 if (bfd_link_pic (info))
2853 /* The only reloc that uses pc_count is R_386_PC32, which will
2854 appear on a call or on something like ".long foo - .". We
2855 want calls to protected symbols to resolve directly to the
2856 function rather than going via the plt. If people want
2857 function pointer comparisons to work as expected then they
2858 should avoid writing assembly like ".long foo - .". */
2859 if (SYMBOL_CALLS_LOCAL (info, h))
2861 struct elf_dyn_relocs **pp;
2863 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2865 p->count -= p->pc_count;
2874 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2876 struct elf_dyn_relocs **pp;
2877 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2879 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2886 /* Also discard relocs on undefined weak syms with non-default
2887 visibility or in PIE. */
2888 if (eh->dyn_relocs != NULL
2889 && h->root.type == bfd_link_hash_undefweak)
2891 /* Undefined weak symbol is never bound locally in shared
2893 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2894 || resolved_to_zero)
2898 /* Keep dynamic non-GOT/non-PLT relocation so that we
2899 can branch to 0 without PLT. */
2900 struct elf_dyn_relocs **pp;
2902 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2903 if (p->pc_count == 0)
2907 /* Remove non-R_386_PC32 relocation. */
2908 p->count = p->pc_count;
2912 if (eh->dyn_relocs != NULL)
2914 /* Make sure undefined weak symbols are output
2915 as dynamic symbols in PIEs for dynamic non-GOT
2916 non-PLT reloations. */
2917 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2922 eh->dyn_relocs = NULL;
2924 else if (h->dynindx == -1
2925 && !h->forced_local)
2927 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2932 else if (ELIMINATE_COPY_RELOCS)
2934 /* For the non-shared case, discard space for relocs against
2935 symbols which turn out to need copy relocs or are not
2936 dynamic. Keep dynamic relocations for run-time function
2937 pointer initialization. */
2939 if ((!h->non_got_ref
2940 || eh->func_pointer_refcount > 0
2941 || (h->root.type == bfd_link_hash_undefweak
2942 && !resolved_to_zero))
2945 || (htab->elf.dynamic_sections_created
2946 && (h->root.type == bfd_link_hash_undefweak
2947 || h->root.type == bfd_link_hash_undefined))))
2949 /* Make sure this symbol is output as a dynamic symbol.
2950 Undefined weak syms won't yet be marked as dynamic. */
2951 if (h->dynindx == -1
2953 && !resolved_to_zero)
2955 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2959 /* If that succeeded, we know we'll be keeping all the
2961 if (h->dynindx != -1)
2965 eh->dyn_relocs = NULL;
2966 eh->func_pointer_refcount = 0;
2971 /* Finally, allocate space. */
2972 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2976 sreloc = elf_section_data (p->sec)->sreloc;
2978 BFD_ASSERT (sreloc != NULL);
2979 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2985 /* Allocate space in .plt, .got and associated reloc sections for
2986 local dynamic relocs. */
2989 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2991 struct elf_link_hash_entry *h
2992 = (struct elf_link_hash_entry *) *slot;
2994 if (h->type != STT_GNU_IFUNC
2998 || h->root.type != bfd_link_hash_defined)
3001 return elf_i386_allocate_dynrelocs (h, inf);
3004 /* Find any dynamic relocs that apply to read-only sections. */
3007 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3009 struct elf_i386_link_hash_entry *eh;
3010 struct elf_dyn_relocs *p;
3012 /* Skip local IFUNC symbols. */
3013 if (h->forced_local && h->type == STT_GNU_IFUNC)
3016 eh = (struct elf_i386_link_hash_entry *) h;
3017 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3019 asection *s = p->sec->output_section;
3021 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3023 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3025 info->flags |= DF_TEXTREL;
3027 if ((info->warn_shared_textrel && bfd_link_pic (info))
3028 || info->error_textrel)
3029 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3030 p->sec->owner, h->root.root.string,
3033 /* Not an error, just cut short the traversal. */
3040 /* Convert load via the GOT slot to load immediate. */
3043 elf_i386_convert_load (bfd *abfd, asection *sec,
3044 struct bfd_link_info *link_info)
3046 struct elf_i386_link_hash_table *htab;
3047 Elf_Internal_Shdr *symtab_hdr;
3048 Elf_Internal_Rela *internal_relocs;
3049 Elf_Internal_Rela *irel, *irelend;
3051 bfd_boolean changed;
3052 bfd_signed_vma *local_got_refcounts;
3054 /* Don't even try to convert non-ELF outputs. */
3055 if (!is_elf_hash_table (link_info->hash))
3058 /* Nothing to do if there is no need or no output. */
3059 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3060 || sec->need_convert_load == 0
3061 || bfd_is_abs_section (sec->output_section))
3064 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3066 /* Load the relocations for this section. */
3067 internal_relocs = (_bfd_elf_link_read_relocs
3068 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3069 link_info->keep_memory));
3070 if (internal_relocs == NULL)
3074 htab = elf_i386_hash_table (link_info);
3075 local_got_refcounts = elf_local_got_refcounts (abfd);
3077 /* Get the section contents. */
3078 if (elf_section_data (sec)->this_hdr.contents != NULL)
3079 contents = elf_section_data (sec)->this_hdr.contents;
3082 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3086 irelend = internal_relocs + sec->reloc_count;
3087 for (irel = internal_relocs; irel < irelend; irel++)
3089 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3090 unsigned int r_symndx;
3091 struct elf_link_hash_entry *h;
3092 bfd_boolean converted;
3094 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3095 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3096 if (r_type != R_386_GOT32X)
3099 r_symndx = ELF32_R_SYM (irel->r_info);
3100 if (r_symndx < symtab_hdr->sh_info)
3101 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3102 (const Elf_Internal_Rela *) irel,
3106 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3107 while (h->root.type == bfd_link_hash_indirect
3108 || h->root.type == bfd_link_hash_warning)
3109 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3112 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3113 if (h != NULL && h->type == STT_GNU_IFUNC)
3117 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3118 irel, h, &converted, link_info))
3123 changed = converted;
3126 if (h->got.refcount > 0)
3127 h->got.refcount -= 1;
3131 if (local_got_refcounts != NULL
3132 && local_got_refcounts[r_symndx] > 0)
3133 local_got_refcounts[r_symndx] -= 1;
3138 if (contents != NULL
3139 && elf_section_data (sec)->this_hdr.contents != contents)
3141 if (!changed && !link_info->keep_memory)
3145 /* Cache the section contents for elf_link_input_bfd. */
3146 elf_section_data (sec)->this_hdr.contents = contents;
3150 if (elf_section_data (sec)->relocs != internal_relocs)
3153 free (internal_relocs);
3155 elf_section_data (sec)->relocs = internal_relocs;
3161 if (contents != NULL
3162 && elf_section_data (sec)->this_hdr.contents != contents)
3164 if (internal_relocs != NULL
3165 && elf_section_data (sec)->relocs != internal_relocs)
3166 free (internal_relocs);
3170 /* Set the sizes of the dynamic sections. */
3173 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3175 struct elf_i386_link_hash_table *htab;
3181 htab = elf_i386_hash_table (info);
3184 dynobj = htab->elf.dynobj;
3188 /* Set up .got offsets for local syms, and space for local dynamic
3190 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3192 bfd_signed_vma *local_got;
3193 bfd_signed_vma *end_local_got;
3194 char *local_tls_type;
3195 bfd_vma *local_tlsdesc_gotent;
3196 bfd_size_type locsymcount;
3197 Elf_Internal_Shdr *symtab_hdr;
3200 if (! is_i386_elf (ibfd))
3203 for (s = ibfd->sections; s != NULL; s = s->next)
3205 struct elf_dyn_relocs *p;
3207 if (!elf_i386_convert_load (ibfd, s, info))
3210 for (p = ((struct elf_dyn_relocs *)
3211 elf_section_data (s)->local_dynrel);
3215 if (!bfd_is_abs_section (p->sec)
3216 && bfd_is_abs_section (p->sec->output_section))
3218 /* Input section has been discarded, either because
3219 it is a copy of a linkonce section or due to
3220 linker script /DISCARD/, so we'll be discarding
3223 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3224 && strcmp (p->sec->output_section->name,
3227 /* Relocations in vxworks .tls_vars sections are
3228 handled specially by the loader. */
3230 else if (p->count != 0)
3232 srel = elf_section_data (p->sec)->sreloc;
3233 srel->size += p->count * sizeof (Elf32_External_Rel);
3234 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3235 && (info->flags & DF_TEXTREL) == 0)
3237 info->flags |= DF_TEXTREL;
3238 if ((info->warn_shared_textrel && bfd_link_pic (info))
3239 || info->error_textrel)
3240 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3241 p->sec->owner, p->sec);
3247 local_got = elf_local_got_refcounts (ibfd);
3251 symtab_hdr = &elf_symtab_hdr (ibfd);
3252 locsymcount = symtab_hdr->sh_info;
3253 end_local_got = local_got + locsymcount;
3254 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3255 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3257 srel = htab->elf.srelgot;
3258 for (; local_got < end_local_got;
3259 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3261 *local_tlsdesc_gotent = (bfd_vma) -1;
3264 if (GOT_TLS_GDESC_P (*local_tls_type))
3266 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3267 - elf_i386_compute_jump_table_size (htab);
3268 htab->elf.sgotplt->size += 8;
3269 *local_got = (bfd_vma) -2;
3271 if (! GOT_TLS_GDESC_P (*local_tls_type)
3272 || GOT_TLS_GD_P (*local_tls_type))
3274 *local_got = s->size;
3276 if (GOT_TLS_GD_P (*local_tls_type)
3277 || *local_tls_type == GOT_TLS_IE_BOTH)
3280 if (bfd_link_pic (info)
3281 || GOT_TLS_GD_ANY_P (*local_tls_type)
3282 || (*local_tls_type & GOT_TLS_IE))
3284 if (*local_tls_type == GOT_TLS_IE_BOTH)
3285 srel->size += 2 * sizeof (Elf32_External_Rel);
3286 else if (GOT_TLS_GD_P (*local_tls_type)
3287 || ! GOT_TLS_GDESC_P (*local_tls_type))
3288 srel->size += sizeof (Elf32_External_Rel);
3289 if (GOT_TLS_GDESC_P (*local_tls_type))
3290 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3294 *local_got = (bfd_vma) -1;
3298 if (htab->tls_ldm_got.refcount > 0)
3300 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3302 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3303 htab->elf.sgot->size += 8;
3304 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3307 htab->tls_ldm_got.offset = -1;
3309 /* Allocate global sym .plt and .got entries, and space for global
3310 sym dynamic relocs. */
3311 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3313 /* Allocate .plt and .got entries, and space for local symbols. */
3314 htab_traverse (htab->loc_hash_table,
3315 elf_i386_allocate_local_dynrelocs,
3318 /* For every jump slot reserved in the sgotplt, reloc_count is
3319 incremented. However, when we reserve space for TLS descriptors,
3320 it's not incremented, so in order to compute the space reserved
3321 for them, it suffices to multiply the reloc count by the jump
3324 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3325 so that R_386_IRELATIVE entries come last. */
3326 if (htab->elf.srelplt)
3328 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3329 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3330 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3332 else if (htab->elf.irelplt)
3333 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3336 if (htab->elf.sgotplt)
3338 /* Don't allocate .got.plt section if there are no GOT nor PLT
3339 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3340 if ((htab->elf.hgot == NULL
3341 || !htab->elf.hgot->ref_regular_nonweak)
3342 && (htab->elf.sgotplt->size
3343 == get_elf_backend_data (output_bfd)->got_header_size)
3344 && (htab->elf.splt == NULL
3345 || htab->elf.splt->size == 0)
3346 && (htab->elf.sgot == NULL
3347 || htab->elf.sgot->size == 0)
3348 && (htab->elf.iplt == NULL
3349 || htab->elf.iplt->size == 0)
3350 && (htab->elf.igotplt == NULL
3351 || htab->elf.igotplt->size == 0))
3352 htab->elf.sgotplt->size = 0;
3356 if (htab->plt_eh_frame != NULL
3357 && htab->elf.splt != NULL
3358 && htab->elf.splt->size != 0
3359 && !bfd_is_abs_section (htab->elf.splt->output_section)
3360 && _bfd_elf_eh_frame_present (info))
3361 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3363 /* We now have determined the sizes of the various dynamic sections.
3364 Allocate memory for them. */
3366 for (s = dynobj->sections; s != NULL; s = s->next)
3368 bfd_boolean strip_section = TRUE;
3370 if ((s->flags & SEC_LINKER_CREATED) == 0)
3373 if (s == htab->elf.splt
3374 || s == htab->elf.sgot)
3376 /* Strip this section if we don't need it; see the
3378 /* We'd like to strip these sections if they aren't needed, but if
3379 we've exported dynamic symbols from them we must leave them.
3380 It's too late to tell BFD to get rid of the symbols. */
3382 if (htab->elf.hplt != NULL)
3383 strip_section = FALSE;
3385 else if (s == htab->elf.sgotplt
3386 || s == htab->elf.iplt
3387 || s == htab->elf.igotplt
3388 || s == htab->plt_got
3389 || s == htab->plt_eh_frame
3390 || s == htab->sdynbss)
3392 /* Strip these too. */
3394 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3397 && s != htab->elf.srelplt
3398 && s != htab->srelplt2)
3401 /* We use the reloc_count field as a counter if we need
3402 to copy relocs into the output file. */
3407 /* It's not one of our sections, so don't allocate space. */
3413 /* If we don't need this section, strip it from the
3414 output file. This is mostly to handle .rel.bss and
3415 .rel.plt. We must create both sections in
3416 create_dynamic_sections, because they must be created
3417 before the linker maps input sections to output
3418 sections. The linker does that before
3419 adjust_dynamic_symbol is called, and it is that
3420 function which decides whether anything needs to go
3421 into these sections. */
3423 s->flags |= SEC_EXCLUDE;
3427 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3430 /* Allocate memory for the section contents. We use bfd_zalloc
3431 here in case unused entries are not reclaimed before the
3432 section's contents are written out. This should not happen,
3433 but this way if it does, we get a R_386_NONE reloc instead
3435 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3436 if (s->contents == NULL)
3440 if (htab->plt_eh_frame != NULL
3441 && htab->plt_eh_frame->contents != NULL)
3443 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3444 sizeof (elf_i386_eh_frame_plt));
3445 bfd_put_32 (dynobj, htab->elf.splt->size,
3446 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3449 if (htab->elf.dynamic_sections_created)
3451 /* Add some entries to the .dynamic section. We fill in the
3452 values later, in elf_i386_finish_dynamic_sections, but we
3453 must add the entries now so that we get the correct size for
3454 the .dynamic section. The DT_DEBUG entry is filled in by the
3455 dynamic linker and used by the debugger. */
3456 #define add_dynamic_entry(TAG, VAL) \
3457 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3459 if (bfd_link_executable (info))
3461 if (!add_dynamic_entry (DT_DEBUG, 0))
3465 if (htab->elf.splt->size != 0)
3467 /* DT_PLTGOT is used by prelink even if there is no PLT
3469 if (!add_dynamic_entry (DT_PLTGOT, 0))
3472 if (htab->elf.srelplt->size != 0)
3474 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3475 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3476 || !add_dynamic_entry (DT_JMPREL, 0))
3483 if (!add_dynamic_entry (DT_REL, 0)
3484 || !add_dynamic_entry (DT_RELSZ, 0)
3485 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3488 /* If any dynamic relocs apply to a read-only section,
3489 then we need a DT_TEXTREL entry. */
3490 if ((info->flags & DF_TEXTREL) == 0)
3491 elf_link_hash_traverse (&htab->elf,
3492 elf_i386_readonly_dynrelocs, info);
3494 if ((info->flags & DF_TEXTREL) != 0)
3496 if (htab->readonly_dynrelocs_against_ifunc)
3498 info->callbacks->einfo
3499 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3500 bfd_set_error (bfd_error_bad_value);
3504 if (!add_dynamic_entry (DT_TEXTREL, 0))
3508 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3509 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3512 #undef add_dynamic_entry
3518 elf_i386_always_size_sections (bfd *output_bfd,
3519 struct bfd_link_info *info)
3521 asection *tls_sec = elf_hash_table (info)->tls_sec;
3525 struct elf_link_hash_entry *tlsbase;
3527 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3528 "_TLS_MODULE_BASE_",
3529 FALSE, FALSE, FALSE);
3531 if (tlsbase && tlsbase->type == STT_TLS)
3533 struct elf_i386_link_hash_table *htab;
3534 struct bfd_link_hash_entry *bh = NULL;
3535 const struct elf_backend_data *bed
3536 = get_elf_backend_data (output_bfd);
3538 htab = elf_i386_hash_table (info);
3542 if (!(_bfd_generic_link_add_one_symbol
3543 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3544 tls_sec, 0, NULL, FALSE,
3545 bed->collect, &bh)))
3548 htab->tls_module_base = bh;
3550 tlsbase = (struct elf_link_hash_entry *)bh;
3551 tlsbase->def_regular = 1;
3552 tlsbase->other = STV_HIDDEN;
3553 tlsbase->root.linker_def = 1;
3554 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3561 /* Set the correct type for an x86 ELF section. We do this by the
3562 section name, which is a hack, but ought to work. */
3565 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3566 Elf_Internal_Shdr *hdr,
3571 name = bfd_get_section_name (abfd, sec);
3573 /* This is an ugly, but unfortunately necessary hack that is
3574 needed when producing EFI binaries on x86. It tells
3575 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3576 containing ELF relocation info. We need this hack in order to
3577 be able to generate ELF binaries that can be translated into
3578 EFI applications (which are essentially COFF objects). Those
3579 files contain a COFF ".reloc" section inside an ELFNN object,
3580 which would normally cause BFD to segfault because it would
3581 attempt to interpret this section as containing relocation
3582 entries for section "oc". With this hack enabled, ".reloc"
3583 will be treated as a normal data section, which will avoid the
3584 segfault. However, you won't be able to create an ELFNN binary
3585 with a section named "oc" that needs relocations, but that's
3586 the kind of ugly side-effects you get when detecting section
3587 types based on their names... In practice, this limitation is
3588 unlikely to bite. */
3589 if (strcmp (name, ".reloc") == 0)
3590 hdr->sh_type = SHT_PROGBITS;
3595 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3596 executables. Rather than setting it to the beginning of the TLS
3597 section, we have to set it to the end. This function may be called
3598 multiple times, it is idempotent. */
3601 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3603 struct elf_i386_link_hash_table *htab;
3604 struct bfd_link_hash_entry *base;
3606 if (!bfd_link_executable (info))
3609 htab = elf_i386_hash_table (info);
3613 base = htab->tls_module_base;
3617 base->u.def.value = htab->elf.tls_size;
3620 /* Return the base VMA address which should be subtracted from real addresses
3621 when resolving @dtpoff relocation.
3622 This is PT_TLS segment p_vaddr. */
3625 elf_i386_dtpoff_base (struct bfd_link_info *info)
3627 /* If tls_sec is NULL, we should have signalled an error already. */
3628 if (elf_hash_table (info)->tls_sec == NULL)
3630 return elf_hash_table (info)->tls_sec->vma;
3633 /* Return the relocation value for @tpoff relocation
3634 if STT_TLS virtual address is ADDRESS. */
3637 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3639 struct elf_link_hash_table *htab = elf_hash_table (info);
3640 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3641 bfd_vma static_tls_size;
3643 /* If tls_sec is NULL, we should have signalled an error already. */
3644 if (htab->tls_sec == NULL)
3647 /* Consider special static TLS alignment requirements. */
3648 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3649 return static_tls_size + htab->tls_sec->vma - address;
3652 /* Relocate an i386 ELF section. */
3655 elf_i386_relocate_section (bfd *output_bfd,
3656 struct bfd_link_info *info,
3658 asection *input_section,
3660 Elf_Internal_Rela *relocs,
3661 Elf_Internal_Sym *local_syms,
3662 asection **local_sections)
3664 struct elf_i386_link_hash_table *htab;
3665 Elf_Internal_Shdr *symtab_hdr;
3666 struct elf_link_hash_entry **sym_hashes;
3667 bfd_vma *local_got_offsets;
3668 bfd_vma *local_tlsdesc_gotents;
3669 Elf_Internal_Rela *rel;
3670 Elf_Internal_Rela *wrel;
3671 Elf_Internal_Rela *relend;
3672 bfd_boolean is_vxworks_tls;
3673 unsigned plt_entry_size;
3675 BFD_ASSERT (is_i386_elf (input_bfd));
3677 /* Skip if check_relocs failed. */
3678 if (input_section->check_relocs_failed)
3681 htab = elf_i386_hash_table (info);
3684 symtab_hdr = &elf_symtab_hdr (input_bfd);
3685 sym_hashes = elf_sym_hashes (input_bfd);
3686 local_got_offsets = elf_local_got_offsets (input_bfd);
3687 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3688 /* We have to handle relocations in vxworks .tls_vars sections
3689 specially, because the dynamic loader is 'weird'. */
3690 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3691 && bfd_link_pic (info)
3692 && !strcmp (input_section->output_section->name,
3695 elf_i386_set_tls_module_base (info);
3697 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3699 rel = wrel = relocs;
3700 relend = relocs + input_section->reloc_count;
3701 for (; rel < relend; wrel++, rel++)
3703 unsigned int r_type;
3704 reloc_howto_type *howto;
3705 unsigned long r_symndx;
3706 struct elf_link_hash_entry *h;
3707 struct elf_i386_link_hash_entry *eh;
3708 Elf_Internal_Sym *sym;
3710 bfd_vma off, offplt, plt_offset;
3712 bfd_boolean unresolved_reloc;
3713 bfd_reloc_status_type r;
3717 asection *resolved_plt;
3718 bfd_boolean resolved_to_zero;
3720 r_type = ELF32_R_TYPE (rel->r_info);
3721 if (r_type == R_386_GNU_VTINHERIT
3722 || r_type == R_386_GNU_VTENTRY)
3729 if ((indx = r_type) >= R_386_standard
3730 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3731 >= R_386_ext - R_386_standard)
3732 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3733 >= R_386_ext2 - R_386_ext))
3735 (*_bfd_error_handler)
3736 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3737 input_bfd, input_section, r_type);
3738 bfd_set_error (bfd_error_bad_value);
3741 howto = elf_howto_table + indx;
3743 r_symndx = ELF32_R_SYM (rel->r_info);
3747 unresolved_reloc = FALSE;
3748 if (r_symndx < symtab_hdr->sh_info)
3750 sym = local_syms + r_symndx;
3751 sec = local_sections[r_symndx];
3752 relocation = (sec->output_section->vma
3753 + sec->output_offset
3755 st_size = sym->st_size;
3757 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3758 && ((sec->flags & SEC_MERGE) != 0
3759 || (bfd_link_relocatable (info)
3760 && sec->output_offset != 0)))
3763 bfd_byte *where = contents + rel->r_offset;
3765 switch (howto->size)
3768 addend = bfd_get_8 (input_bfd, where);
3769 if (howto->pc_relative)
3771 addend = (addend ^ 0x80) - 0x80;
3776 addend = bfd_get_16 (input_bfd, where);
3777 if (howto->pc_relative)
3779 addend = (addend ^ 0x8000) - 0x8000;
3784 addend = bfd_get_32 (input_bfd, where);
3785 if (howto->pc_relative)
3787 addend = (addend ^ 0x80000000) - 0x80000000;
3795 if (bfd_link_relocatable (info))
3796 addend += sec->output_offset;
3799 asection *msec = sec;
3800 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3802 addend -= relocation;
3803 addend += msec->output_section->vma + msec->output_offset;
3806 switch (howto->size)
3809 /* FIXME: overflow checks. */
3810 if (howto->pc_relative)
3812 bfd_put_8 (input_bfd, addend, where);
3815 if (howto->pc_relative)
3817 bfd_put_16 (input_bfd, addend, where);
3820 if (howto->pc_relative)
3822 bfd_put_32 (input_bfd, addend, where);
3826 else if (!bfd_link_relocatable (info)
3827 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3829 /* Relocate against local STT_GNU_IFUNC symbol. */
3830 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3835 /* Set STT_GNU_IFUNC symbol value. */
3836 h->root.u.def.value = sym->st_value;
3837 h->root.u.def.section = sec;
3842 bfd_boolean warned ATTRIBUTE_UNUSED;
3843 bfd_boolean ignored ATTRIBUTE_UNUSED;
3845 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3846 r_symndx, symtab_hdr, sym_hashes,
3848 unresolved_reloc, warned, ignored);
3852 if (sec != NULL && discarded_section (sec))
3854 _bfd_clear_contents (howto, input_bfd, input_section,
3855 contents + rel->r_offset);
3856 wrel->r_offset = rel->r_offset;
3860 /* For ld -r, remove relocations in debug sections against
3861 sections defined in discarded sections. Not done for
3862 eh_frame editing code expects to be present. */
3863 if (bfd_link_relocatable (info)
3864 && (input_section->flags & SEC_DEBUGGING))
3870 if (bfd_link_relocatable (info))
3877 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3878 it here if it is defined in a non-shared object. */
3880 && h->type == STT_GNU_IFUNC
3883 asection *plt, *gotplt, *base_got;
3887 if ((input_section->flags & SEC_ALLOC) == 0)
3889 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3890 sections because such sections are not SEC_ALLOC and
3891 thus ld.so will not process them. */
3892 if ((input_section->flags & SEC_DEBUGGING) != 0)
3896 else if (h->plt.offset == (bfd_vma) -1)
3899 /* STT_GNU_IFUNC symbol must go through PLT. */
3900 if (htab->elf.splt != NULL)
3902 plt = htab->elf.splt;
3903 gotplt = htab->elf.sgotplt;
3907 plt = htab->elf.iplt;
3908 gotplt = htab->elf.igotplt;
3911 relocation = (plt->output_section->vma
3912 + plt->output_offset + h->plt.offset);
3917 if (h->root.root.string)
3918 name = h->root.root.string;
3920 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3922 (*_bfd_error_handler)
3923 (_("%B: relocation %s against STT_GNU_IFUNC "
3924 "symbol `%s' isn't handled by %s"), input_bfd,
3925 elf_howto_table[r_type].name,
3926 name, __FUNCTION__);
3927 bfd_set_error (bfd_error_bad_value);
3931 /* Generate dynamic relcoation only when there is a
3932 non-GOT reference in a shared object. */
3933 if (bfd_link_pic (info) && h->non_got_ref)
3935 Elf_Internal_Rela outrel;
3939 /* Need a dynamic relocation to get the real function
3941 offset = _bfd_elf_section_offset (output_bfd,
3945 if (offset == (bfd_vma) -1
3946 || offset == (bfd_vma) -2)
3949 outrel.r_offset = (input_section->output_section->vma
3950 + input_section->output_offset
3953 if (h->dynindx == -1
3955 || bfd_link_executable (info))
3957 /* This symbol is resolved locally. */
3958 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3959 bfd_put_32 (output_bfd,
3960 (h->root.u.def.value
3961 + h->root.u.def.section->output_section->vma
3962 + h->root.u.def.section->output_offset),
3966 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3968 sreloc = htab->elf.irelifunc;
3969 elf_append_rel (output_bfd, sreloc, &outrel);
3971 /* If this reloc is against an external symbol, we
3972 do not want to fiddle with the addend. Otherwise,
3973 we need to include the symbol value so that it
3974 becomes an addend for the dynamic reloc. For an
3975 internal symbol, we have updated addend. */
3985 base_got = htab->elf.sgot;
3986 off = h->got.offset;
3988 if (base_got == NULL)
3991 if (off == (bfd_vma) -1)
3993 /* We can't use h->got.offset here to save state, or
3994 even just remember the offset, as finish_dynamic_symbol
3995 would use that as offset into .got. */
3997 if (htab->elf.splt != NULL)
3999 plt_index = h->plt.offset / plt_entry_size - 1;
4000 off = (plt_index + 3) * 4;
4001 base_got = htab->elf.sgotplt;
4005 plt_index = h->plt.offset / plt_entry_size;
4006 off = plt_index * 4;
4007 base_got = htab->elf.igotplt;
4010 if (h->dynindx == -1
4014 /* This references the local defitionion. We must
4015 initialize this entry in the global offset table.
4016 Since the offset must always be a multiple of 8,
4017 we use the least significant bit to record
4018 whether we have initialized it already.
4020 When doing a dynamic link, we create a .rela.got
4021 relocation entry to initialize the value. This
4022 is done in the finish_dynamic_symbol routine. */
4027 bfd_put_32 (output_bfd, relocation,
4028 base_got->contents + off);
4036 relocation = (base_got->output_section->vma
4037 + base_got->output_offset + off
4038 - gotplt->output_section->vma
4039 - gotplt->output_offset);
4041 if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5)
4043 if (bfd_link_pic (info))
4044 goto disallow_got32;
4046 /* Add the GOT base if there is no base register. */
4047 relocation += (gotplt->output_section->vma
4048 + gotplt->output_offset);
4050 else if (htab->elf.splt == NULL)
4052 /* Adjust for static executables. */
4053 relocation += gotplt->output_offset;
4059 relocation -= (gotplt->output_section->vma
4060 + gotplt->output_offset);
4065 eh = (struct elf_i386_link_hash_entry *) h;
4066 resolved_to_zero = (eh != NULL
4067 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4074 /* Avoid optimizing _DYNAMIC since ld.so may use its
4075 link-time address. */
4076 if (h == htab->elf.hdynamic)
4079 if (bfd_link_pic (info))
4081 /* It is OK to convert mov to lea and convert indirect
4082 branch to direct branch. It is OK to convert adc,
4083 add, and, cmp, or, sbb, sub, test, xor only when PIC
4085 unsigned int opcode, addend;
4086 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4089 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4090 if (opcode != 0x8b && opcode != 0xff)
4094 /* Resolve "mov GOT[(%reg)], %reg",
4095 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4096 and "binop foo@GOT[(%reg)], %reg". */
4098 || (h->plt.offset == (bfd_vma) -1
4099 && h->got.offset == (bfd_vma) -1)
4100 || htab->elf.sgotplt == NULL)
4103 offplt = (htab->elf.sgotplt->output_section->vma
4104 + htab->elf.sgotplt->output_offset);
4106 /* It is relative to .got.plt section. */
4107 if (h->got.offset != (bfd_vma) -1)
4108 /* Use GOT entry. Mask off the least significant bit in
4109 GOT offset which may be set by R_386_GOT32 processing
4111 relocation = (htab->elf.sgot->output_section->vma
4112 + htab->elf.sgot->output_offset
4113 + (h->got.offset & ~1) - offplt);
4115 /* Use GOTPLT entry. */
4116 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4118 if (!bfd_link_pic (info))
4120 /* If not PIC, add the .got.plt section address for
4121 baseless addressing. */
4123 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4124 if ((modrm & 0xc7) == 0x5)
4125 relocation += offplt;
4128 unresolved_reloc = FALSE;
4133 /* Relocation is to the entry for this symbol in the global
4135 if (htab->elf.sgot == NULL)
4142 off = h->got.offset;
4143 dyn = htab->elf.dynamic_sections_created;
4144 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4145 bfd_link_pic (info),
4147 || (bfd_link_pic (info)
4148 && SYMBOL_REFERENCES_LOCAL (info, h))
4149 || (ELF_ST_VISIBILITY (h->other)
4150 && h->root.type == bfd_link_hash_undefweak))
4152 /* This is actually a static link, or it is a
4153 -Bsymbolic link and the symbol is defined
4154 locally, or the symbol was forced to be local
4155 because of a version file. We must initialize
4156 this entry in the global offset table. Since the
4157 offset must always be a multiple of 4, we use the
4158 least significant bit to record whether we have
4159 initialized it already.
4161 When doing a dynamic link, we create a .rel.got
4162 relocation entry to initialize the value. This
4163 is done in the finish_dynamic_symbol routine. */
4168 bfd_put_32 (output_bfd, relocation,
4169 htab->elf.sgot->contents + off);
4174 unresolved_reloc = FALSE;
4178 if (local_got_offsets == NULL)
4181 off = local_got_offsets[r_symndx];
4183 /* The offset must always be a multiple of 4. We use
4184 the least significant bit to record whether we have
4185 already generated the necessary reloc. */
4190 bfd_put_32 (output_bfd, relocation,
4191 htab->elf.sgot->contents + off);
4193 if (bfd_link_pic (info))
4196 Elf_Internal_Rela outrel;
4198 s = htab->elf.srelgot;
4202 outrel.r_offset = (htab->elf.sgot->output_section->vma
4203 + htab->elf.sgot->output_offset
4205 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4206 elf_append_rel (output_bfd, s, &outrel);
4209 local_got_offsets[r_symndx] |= 1;
4213 if (off >= (bfd_vma) -2)
4216 relocation = (htab->elf.sgot->output_section->vma
4217 + htab->elf.sgot->output_offset + off);
4218 if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5)
4220 if (bfd_link_pic (info))
4222 /* For PIC, disallow R_386_GOT32 without a base
4223 register since we don't know what the GOT base
4229 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4232 name = h->root.root.string;
4234 (*_bfd_error_handler)
4235 (_("%B: direct GOT relocation %s against `%s' without base register can not be used when making a shared object"),
4236 input_bfd, howto->name, name);
4237 bfd_set_error (bfd_error_bad_value);
4243 /* Subtract the .got.plt section address only with a base
4245 relocation -= (htab->elf.sgotplt->output_section->vma
4246 + htab->elf.sgotplt->output_offset);
4252 /* Relocation is relative to the start of the global offset
4255 /* Check to make sure it isn't a protected function or data
4256 symbol for shared library since it may not be local when
4257 used as function address or with copy relocation. We also
4258 need to make sure that a symbol is referenced locally. */
4259 if (!bfd_link_executable (info) && h)
4261 if (!h->def_regular)
4265 switch (ELF_ST_VISIBILITY (h->other))
4268 v = _("hidden symbol");
4271 v = _("internal symbol");
4274 v = _("protected symbol");
4281 (*_bfd_error_handler)
4282 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4283 input_bfd, v, h->root.root.string);
4284 bfd_set_error (bfd_error_bad_value);
4287 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4288 && (h->type == STT_FUNC
4289 || h->type == STT_OBJECT)
4290 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4292 (*_bfd_error_handler)
4293 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4295 h->type == STT_FUNC ? "function" : "data",
4296 h->root.root.string);
4297 bfd_set_error (bfd_error_bad_value);
4302 /* Note that sgot is not involved in this
4303 calculation. We always want the start of .got.plt. If we
4304 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4305 permitted by the ABI, we might have to change this
4307 relocation -= htab->elf.sgotplt->output_section->vma
4308 + htab->elf.sgotplt->output_offset;
4312 /* Use global offset table as symbol value. */
4313 relocation = htab->elf.sgotplt->output_section->vma
4314 + htab->elf.sgotplt->output_offset;
4315 unresolved_reloc = FALSE;
4319 /* Relocation is to the entry for this symbol in the
4320 procedure linkage table. */
4322 /* Resolve a PLT32 reloc against a local symbol directly,
4323 without using the procedure linkage table. */
4327 if ((h->plt.offset == (bfd_vma) -1
4328 && eh->plt_got.offset == (bfd_vma) -1)
4329 || htab->elf.splt == NULL)
4331 /* We didn't make a PLT entry for this symbol. This
4332 happens when statically linking PIC code, or when
4333 using -Bsymbolic. */
4337 if (h->plt.offset != (bfd_vma) -1)
4339 resolved_plt = htab->elf.splt;
4340 plt_offset = h->plt.offset;
4344 resolved_plt = htab->plt_got;
4345 plt_offset = eh->plt_got.offset;
4348 relocation = (resolved_plt->output_section->vma
4349 + resolved_plt->output_offset
4351 unresolved_reloc = FALSE;
4355 /* Set to symbol size. */
4356 relocation = st_size;
4361 if ((input_section->flags & SEC_ALLOC) == 0
4365 /* Copy dynamic function pointer relocations. Don't generate
4366 dynamic relocations against resolved undefined weak symbols
4367 in PIE, except for R_386_PC32. */
4368 if ((bfd_link_pic (info)
4370 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4371 && (!resolved_to_zero
4372 || r_type == R_386_PC32))
4373 || h->root.type != bfd_link_hash_undefweak))
4374 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4375 || !SYMBOL_CALLS_LOCAL (info, h)))
4376 || (ELIMINATE_COPY_RELOCS
4377 && !bfd_link_pic (info)
4381 || eh->func_pointer_refcount > 0
4382 || (h->root.type == bfd_link_hash_undefweak
4383 && !resolved_to_zero))
4384 && ((h->def_dynamic && !h->def_regular)
4385 /* Undefined weak symbol is bound locally when
4387 || h->root.type == bfd_link_hash_undefweak)))
4389 Elf_Internal_Rela outrel;
4390 bfd_boolean skip, relocate;
4393 /* When generating a shared object, these relocations
4394 are copied into the output file to be resolved at run
4401 _bfd_elf_section_offset (output_bfd, info, input_section,
4403 if (outrel.r_offset == (bfd_vma) -1)
4405 else if (outrel.r_offset == (bfd_vma) -2)
4406 skip = TRUE, relocate = TRUE;
4407 outrel.r_offset += (input_section->output_section->vma
4408 + input_section->output_offset);
4411 memset (&outrel, 0, sizeof outrel);
4414 && (r_type == R_386_PC32
4415 || !(bfd_link_executable (info)
4416 || SYMBOLIC_BIND (info, h))
4417 || !h->def_regular))
4418 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4421 /* This symbol is local, or marked to become local. */
4423 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4426 sreloc = elf_section_data (input_section)->sreloc;
4428 if (sreloc == NULL || sreloc->contents == NULL)
4430 r = bfd_reloc_notsupported;
4431 goto check_relocation_error;
4434 elf_append_rel (output_bfd, sreloc, &outrel);
4436 /* If this reloc is against an external symbol, we do
4437 not want to fiddle with the addend. Otherwise, we
4438 need to include the symbol value so that it becomes
4439 an addend for the dynamic reloc. */
4446 if (!bfd_link_executable (info))
4448 Elf_Internal_Rela outrel;
4451 outrel.r_offset = rel->r_offset
4452 + input_section->output_section->vma
4453 + input_section->output_offset;
4454 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4455 sreloc = elf_section_data (input_section)->sreloc;
4458 elf_append_rel (output_bfd, sreloc, &outrel);
4463 case R_386_TLS_GOTDESC:
4464 case R_386_TLS_DESC_CALL:
4465 case R_386_TLS_IE_32:
4466 case R_386_TLS_GOTIE:
4467 tls_type = GOT_UNKNOWN;
4468 if (h == NULL && local_got_offsets)
4469 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4471 tls_type = elf_i386_hash_entry(h)->tls_type;
4472 if (tls_type == GOT_TLS_IE)
4473 tls_type = GOT_TLS_IE_NEG;
4475 if (! elf_i386_tls_transition (info, input_bfd,
4476 input_section, contents,
4477 symtab_hdr, sym_hashes,
4478 &r_type, tls_type, rel,
4479 relend, h, r_symndx, TRUE))
4482 if (r_type == R_386_TLS_LE_32)
4484 BFD_ASSERT (! unresolved_reloc);
4485 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4490 /* GD->LE transition. */
4491 type = *(contents + rel->r_offset - 2);
4495 leal foo@tlsgd(,%ebx,1), %eax
4496 call ___tls_get_addr@PLT
4499 subl $foo@tpoff, %eax
4500 (6 byte form of subl). */
4501 roff = rel->r_offset + 5;
4506 leal foo@tlsgd(%ebx), %eax
4507 call ___tls_get_addr@PLT
4510 leal foo@tlsgd(%reg), %eax
4511 call *___tls_get_addr@GOT(%reg)
4512 which may be converted to
4513 addr32 call ___tls_get_addr
4515 movl %gs:0, %eax; subl $foo@tpoff, %eax
4516 (6 byte form of subl). */
4517 roff = rel->r_offset + 6;
4519 memcpy (contents + roff - 8,
4520 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4521 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4523 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4528 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4530 /* GDesc -> LE transition.
4531 It's originally something like:
4532 leal x@tlsdesc(%ebx), %eax
4536 Registers other than %eax may be set up here. */
4541 roff = rel->r_offset;
4542 val = bfd_get_8 (input_bfd, contents + roff - 1);
4544 /* Now modify the instruction as appropriate. */
4545 /* aoliva FIXME: remove the above and xor the byte
4547 bfd_put_8 (output_bfd, val ^ 0x86,
4548 contents + roff - 1);
4549 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4553 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4555 /* GDesc -> LE transition.
4563 roff = rel->r_offset;
4564 bfd_put_8 (output_bfd, 0x66, contents + roff);
4565 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4568 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4572 /* IE->LE transition:
4573 Originally it can be one of:
4581 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4584 /* movl foo, %eax. */
4585 bfd_put_8 (output_bfd, 0xb8,
4586 contents + rel->r_offset - 1);
4592 type = bfd_get_8 (input_bfd,
4593 contents + rel->r_offset - 2);
4598 bfd_put_8 (output_bfd, 0xc7,
4599 contents + rel->r_offset - 2);
4600 bfd_put_8 (output_bfd,
4601 0xc0 | ((val >> 3) & 7),
4602 contents + rel->r_offset - 1);
4606 bfd_put_8 (output_bfd, 0x81,
4607 contents + rel->r_offset - 2);
4608 bfd_put_8 (output_bfd,
4609 0xc0 | ((val >> 3) & 7),
4610 contents + rel->r_offset - 1);
4617 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4618 contents + rel->r_offset);
4623 unsigned int val, type;
4625 /* {IE_32,GOTIE}->LE transition:
4626 Originally it can be one of:
4627 subl foo(%reg1), %reg2
4628 movl foo(%reg1), %reg2
4629 addl foo(%reg1), %reg2
4632 movl $foo, %reg2 (6 byte form)
4633 addl $foo, %reg2. */
4634 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4635 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4639 bfd_put_8 (output_bfd, 0xc7,
4640 contents + rel->r_offset - 2);
4641 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4642 contents + rel->r_offset - 1);
4644 else if (type == 0x2b)
4647 bfd_put_8 (output_bfd, 0x81,
4648 contents + rel->r_offset - 2);
4649 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4650 contents + rel->r_offset - 1);
4652 else if (type == 0x03)
4655 bfd_put_8 (output_bfd, 0x81,
4656 contents + rel->r_offset - 2);
4657 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4658 contents + rel->r_offset - 1);
4662 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4663 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4664 contents + rel->r_offset);
4666 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4667 contents + rel->r_offset);
4672 if (htab->elf.sgot == NULL)
4677 off = h->got.offset;
4678 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4682 if (local_got_offsets == NULL)
4685 off = local_got_offsets[r_symndx];
4686 offplt = local_tlsdesc_gotents[r_symndx];
4693 Elf_Internal_Rela outrel;
4697 if (htab->elf.srelgot == NULL)
4700 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4702 if (GOT_TLS_GDESC_P (tls_type))
4705 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4706 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4707 <= htab->elf.sgotplt->size);
4708 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4709 + htab->elf.sgotplt->output_offset
4711 + htab->sgotplt_jump_table_size);
4712 sreloc = htab->elf.srelplt;
4713 loc = sreloc->contents;
4714 loc += (htab->next_tls_desc_index++
4715 * sizeof (Elf32_External_Rel));
4716 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4717 <= sreloc->contents + sreloc->size);
4718 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4721 BFD_ASSERT (! unresolved_reloc);
4722 bfd_put_32 (output_bfd,
4723 relocation - elf_i386_dtpoff_base (info),
4724 htab->elf.sgotplt->contents + offplt
4725 + htab->sgotplt_jump_table_size + 4);
4729 bfd_put_32 (output_bfd, 0,
4730 htab->elf.sgotplt->contents + offplt
4731 + htab->sgotplt_jump_table_size + 4);
4735 sreloc = htab->elf.srelgot;
4737 outrel.r_offset = (htab->elf.sgot->output_section->vma
4738 + htab->elf.sgot->output_offset + off);
4740 if (GOT_TLS_GD_P (tls_type))
4741 dr_type = R_386_TLS_DTPMOD32;
4742 else if (GOT_TLS_GDESC_P (tls_type))
4744 else if (tls_type == GOT_TLS_IE_POS)
4745 dr_type = R_386_TLS_TPOFF;
4747 dr_type = R_386_TLS_TPOFF32;
4749 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4750 bfd_put_32 (output_bfd,
4751 relocation - elf_i386_dtpoff_base (info),
4752 htab->elf.sgot->contents + off);
4753 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4754 bfd_put_32 (output_bfd,
4755 elf_i386_dtpoff_base (info) - relocation,
4756 htab->elf.sgot->contents + off);
4757 else if (dr_type != R_386_TLS_DESC)
4758 bfd_put_32 (output_bfd, 0,
4759 htab->elf.sgot->contents + off);
4760 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4762 elf_append_rel (output_bfd, sreloc, &outrel);
4764 if (GOT_TLS_GD_P (tls_type))
4768 BFD_ASSERT (! unresolved_reloc);
4769 bfd_put_32 (output_bfd,
4770 relocation - elf_i386_dtpoff_base (info),
4771 htab->elf.sgot->contents + off + 4);
4775 bfd_put_32 (output_bfd, 0,
4776 htab->elf.sgot->contents + off + 4);
4777 outrel.r_info = ELF32_R_INFO (indx,
4778 R_386_TLS_DTPOFF32);
4779 outrel.r_offset += 4;
4780 elf_append_rel (output_bfd, sreloc, &outrel);
4783 else if (tls_type == GOT_TLS_IE_BOTH)
4785 bfd_put_32 (output_bfd,
4787 ? relocation - elf_i386_dtpoff_base (info)
4789 htab->elf.sgot->contents + off + 4);
4790 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4791 outrel.r_offset += 4;
4792 elf_append_rel (output_bfd, sreloc, &outrel);
4799 local_got_offsets[r_symndx] |= 1;
4802 if (off >= (bfd_vma) -2
4803 && ! GOT_TLS_GDESC_P (tls_type))
4805 if (r_type == R_386_TLS_GOTDESC
4806 || r_type == R_386_TLS_DESC_CALL)
4808 relocation = htab->sgotplt_jump_table_size + offplt;
4809 unresolved_reloc = FALSE;
4811 else if (r_type == ELF32_R_TYPE (rel->r_info))
4813 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4814 + htab->elf.sgotplt->output_offset;
4815 relocation = htab->elf.sgot->output_section->vma
4816 + htab->elf.sgot->output_offset + off - g_o_t;
4817 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4818 && tls_type == GOT_TLS_IE_BOTH)
4820 if (r_type == R_386_TLS_IE)
4821 relocation += g_o_t;
4822 unresolved_reloc = FALSE;
4824 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4826 unsigned int val, type;
4829 /* GD->IE transition. */
4830 type = *(contents + rel->r_offset - 2);
4831 val = *(contents + rel->r_offset - 1);
4835 leal foo@tlsgd(,%ebx,1), %eax
4836 call ___tls_get_addr@PLT
4839 subl $foo@gottpoff(%ebx), %eax. */
4841 roff = rel->r_offset - 3;
4846 leal foo@tlsgd(%ebx), %eax
4847 call ___tls_get_addr@PLT
4850 leal foo@tlsgd(%reg), %eax
4851 call *___tls_get_addr@GOT(%reg)
4852 which may be converted to
4853 addr32 call ___tls_get_addr
4856 subl $foo@gottpoff(%reg), %eax. */
4857 roff = rel->r_offset - 2;
4859 memcpy (contents + roff,
4860 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4861 contents[roff + 7] = 0x80 | (val & 7);
4862 /* If foo is used only with foo@gotntpoff(%reg) and
4863 foo@indntpoff, but not with foo@gottpoff(%reg), change
4864 subl $foo@gottpoff(%reg), %eax
4866 addl $foo@gotntpoff(%reg), %eax. */
4867 if (tls_type == GOT_TLS_IE_POS)
4868 contents[roff + 6] = 0x03;
4869 bfd_put_32 (output_bfd,
4870 htab->elf.sgot->output_section->vma
4871 + htab->elf.sgot->output_offset + off
4872 - htab->elf.sgotplt->output_section->vma
4873 - htab->elf.sgotplt->output_offset,
4874 contents + roff + 8);
4875 /* Skip R_386_PLT32 and R_386_GOT32X. */
4880 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4882 /* GDesc -> IE transition.
4883 It's originally something like:
4884 leal x@tlsdesc(%ebx), %eax
4887 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4889 movl x@gottpoff(%ebx), %eax # before negl %eax
4891 Registers other than %eax may be set up here. */
4895 /* First, make sure it's a leal adding ebx to a 32-bit
4896 offset into any register, although it's probably
4897 almost always going to be eax. */
4898 roff = rel->r_offset;
4900 /* Now modify the instruction as appropriate. */
4901 /* To turn a leal into a movl in the form we use it, it
4902 suffices to change the first byte from 0x8d to 0x8b.
4903 aoliva FIXME: should we decide to keep the leal, all
4904 we have to do is remove the statement below, and
4905 adjust the relaxation of R_386_TLS_DESC_CALL. */
4906 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4908 if (tls_type == GOT_TLS_IE_BOTH)
4911 bfd_put_32 (output_bfd,
4912 htab->elf.sgot->output_section->vma
4913 + htab->elf.sgot->output_offset + off
4914 - htab->elf.sgotplt->output_section->vma
4915 - htab->elf.sgotplt->output_offset,
4919 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4921 /* GDesc -> IE transition.
4929 depending on how we transformed the TLS_GOTDESC above.
4934 roff = rel->r_offset;
4936 /* Now modify the instruction as appropriate. */
4937 if (tls_type != GOT_TLS_IE_NEG)
4940 bfd_put_8 (output_bfd, 0x66, contents + roff);
4941 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4946 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4947 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4957 if (! elf_i386_tls_transition (info, input_bfd,
4958 input_section, contents,
4959 symtab_hdr, sym_hashes,
4960 &r_type, GOT_UNKNOWN, rel,
4961 relend, h, r_symndx, TRUE))
4964 if (r_type != R_386_TLS_LDM)
4966 /* LD->LE transition. Change
4967 leal foo@tlsldm(%ebx) %eax
4968 call ___tls_get_addr@PLT
4972 leal 0(%esi,1), %esi
4974 leal foo@tlsldm(%reg) %eax
4975 call *___tls_get_addr@GOT(%reg)
4976 which may be converted to
4977 addr32 call ___tls_get_addr
4980 leal 0(%esi), %esi */
4981 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4982 if (*(contents + rel->r_offset + 4) == 0xff
4983 || *(contents + rel->r_offset + 4) == 0x67)
4984 memcpy (contents + rel->r_offset - 2,
4985 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
4987 memcpy (contents + rel->r_offset - 2,
4988 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4989 /* Skip R_386_PC32/R_386_PLT32. */
4995 if (htab->elf.sgot == NULL)
4998 off = htab->tls_ldm_got.offset;
5003 Elf_Internal_Rela outrel;
5005 if (htab->elf.srelgot == NULL)
5008 outrel.r_offset = (htab->elf.sgot->output_section->vma
5009 + htab->elf.sgot->output_offset + off);
5011 bfd_put_32 (output_bfd, 0,
5012 htab->elf.sgot->contents + off);
5013 bfd_put_32 (output_bfd, 0,
5014 htab->elf.sgot->contents + off + 4);
5015 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5016 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5017 htab->tls_ldm_got.offset |= 1;
5019 relocation = htab->elf.sgot->output_section->vma
5020 + htab->elf.sgot->output_offset + off
5021 - htab->elf.sgotplt->output_section->vma
5022 - htab->elf.sgotplt->output_offset;
5023 unresolved_reloc = FALSE;
5026 case R_386_TLS_LDO_32:
5027 if (!bfd_link_executable (info)
5028 || (input_section->flags & SEC_CODE) == 0)
5029 relocation -= elf_i386_dtpoff_base (info);
5031 /* When converting LDO to LE, we must negate. */
5032 relocation = -elf_i386_tpoff (info, relocation);
5035 case R_386_TLS_LE_32:
5037 if (!bfd_link_executable (info))
5039 Elf_Internal_Rela outrel;
5042 outrel.r_offset = rel->r_offset
5043 + input_section->output_section->vma
5044 + input_section->output_offset;
5045 if (h != NULL && h->dynindx != -1)
5049 if (r_type == R_386_TLS_LE_32)
5050 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5052 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5053 sreloc = elf_section_data (input_section)->sreloc;
5056 elf_append_rel (output_bfd, sreloc, &outrel);
5059 else if (r_type == R_386_TLS_LE_32)
5060 relocation = elf_i386_dtpoff_base (info) - relocation;
5062 relocation -= elf_i386_dtpoff_base (info);
5064 else if (r_type == R_386_TLS_LE_32)
5065 relocation = elf_i386_tpoff (info, relocation);
5067 relocation = -elf_i386_tpoff (info, relocation);
5074 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5075 because such sections are not SEC_ALLOC and thus ld.so will
5076 not process them. */
5077 if (unresolved_reloc
5078 && !((input_section->flags & SEC_DEBUGGING) != 0
5080 && _bfd_elf_section_offset (output_bfd, info, input_section,
5081 rel->r_offset) != (bfd_vma) -1)
5083 (*_bfd_error_handler)
5084 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5087 (long) rel->r_offset,
5089 h->root.root.string);
5094 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5095 contents, rel->r_offset,
5098 check_relocation_error:
5099 if (r != bfd_reloc_ok)
5104 name = h->root.root.string;
5107 name = bfd_elf_string_from_elf_section (input_bfd,
5108 symtab_hdr->sh_link,
5113 name = bfd_section_name (input_bfd, sec);
5116 if (r == bfd_reloc_overflow)
5117 (*info->callbacks->reloc_overflow)
5118 (info, (h ? &h->root : NULL), name, howto->name,
5119 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5122 (*_bfd_error_handler)
5123 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5124 input_bfd, input_section,
5125 (long) rel->r_offset, name, (int) r);
5136 Elf_Internal_Shdr *rel_hdr;
5137 size_t deleted = rel - wrel;
5139 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5140 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5141 if (rel_hdr->sh_size == 0)
5143 /* It is too late to remove an empty reloc section. Leave
5145 ??? What is wrong with an empty section??? */
5146 rel_hdr->sh_size = rel_hdr->sh_entsize;
5149 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5150 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5151 input_section->reloc_count -= deleted;
5157 /* Finish up dynamic symbol handling. We set the contents of various
5158 dynamic sections here. */
5161 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5162 struct bfd_link_info *info,
5163 struct elf_link_hash_entry *h,
5164 Elf_Internal_Sym *sym)
5166 struct elf_i386_link_hash_table *htab;
5167 unsigned plt_entry_size;
5168 const struct elf_i386_backend_data *abed;
5169 struct elf_i386_link_hash_entry *eh;
5170 bfd_boolean local_undefweak;
5172 htab = elf_i386_hash_table (info);
5176 abed = get_elf_i386_backend_data (output_bfd);
5177 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5179 eh = (struct elf_i386_link_hash_entry *) h;
5181 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5182 resolved undefined weak symbols in executable so that their
5183 references have value 0 at run-time. */
5184 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5188 if (h->plt.offset != (bfd_vma) -1)
5192 Elf_Internal_Rela rel;
5194 asection *plt, *gotplt, *relplt;
5196 /* When building a static executable, use .iplt, .igot.plt and
5197 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5198 if (htab->elf.splt != NULL)
5200 plt = htab->elf.splt;
5201 gotplt = htab->elf.sgotplt;
5202 relplt = htab->elf.srelplt;
5206 plt = htab->elf.iplt;
5207 gotplt = htab->elf.igotplt;
5208 relplt = htab->elf.irelplt;
5211 /* This symbol has an entry in the procedure linkage table. Set
5214 if ((h->dynindx == -1
5216 && !((h->forced_local || bfd_link_executable (info))
5218 && h->type == STT_GNU_IFUNC))
5224 /* Get the index in the procedure linkage table which
5225 corresponds to this symbol. This is the index of this symbol
5226 in all the symbols for which we are making plt entries. The
5227 first entry in the procedure linkage table is reserved.
5229 Get the offset into the .got table of the entry that
5230 corresponds to this function. Each .got entry is 4 bytes.
5231 The first three are reserved.
5233 For static executables, we don't reserve anything. */
5235 if (plt == htab->elf.splt)
5237 got_offset = h->plt.offset / plt_entry_size - 1;
5238 got_offset = (got_offset + 3) * 4;
5242 got_offset = h->plt.offset / plt_entry_size;
5243 got_offset = got_offset * 4;
5246 /* Fill in the entry in the procedure linkage table. */
5247 if (! bfd_link_pic (info))
5249 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5250 abed->plt->plt_entry_size);
5251 bfd_put_32 (output_bfd,
5252 (gotplt->output_section->vma
5253 + gotplt->output_offset
5255 plt->contents + h->plt.offset
5256 + abed->plt->plt_got_offset);
5258 if (abed->is_vxworks)
5260 int s, k, reloc_index;
5262 /* Create the R_386_32 relocation referencing the GOT
5263 for this PLT entry. */
5265 /* S: Current slot number (zero-based). */
5266 s = ((h->plt.offset - abed->plt->plt_entry_size)
5267 / abed->plt->plt_entry_size);
5268 /* K: Number of relocations for PLTResolve. */
5269 if (bfd_link_pic (info))
5270 k = PLTRESOLVE_RELOCS_SHLIB;
5272 k = PLTRESOLVE_RELOCS;
5273 /* Skip the PLTresolve relocations, and the relocations for
5274 the other PLT slots. */
5275 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5276 loc = (htab->srelplt2->contents + reloc_index
5277 * sizeof (Elf32_External_Rel));
5279 rel.r_offset = (htab->elf.splt->output_section->vma
5280 + htab->elf.splt->output_offset
5281 + h->plt.offset + 2),
5282 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5283 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5285 /* Create the R_386_32 relocation referencing the beginning of
5286 the PLT for this GOT entry. */
5287 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5288 + htab->elf.sgotplt->output_offset
5290 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5291 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5292 loc + sizeof (Elf32_External_Rel));
5297 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5298 abed->plt->plt_entry_size);
5299 bfd_put_32 (output_bfd, got_offset,
5300 plt->contents + h->plt.offset
5301 + abed->plt->plt_got_offset);
5304 /* Fill in the entry in the global offset table. Leave the entry
5305 as zero for undefined weak symbol in PIE. No PLT relocation
5306 against undefined weak symbol in PIE. */
5307 if (!local_undefweak)
5309 bfd_put_32 (output_bfd,
5310 (plt->output_section->vma
5311 + plt->output_offset
5313 + abed->plt->plt_lazy_offset),
5314 gotplt->contents + got_offset);
5316 /* Fill in the entry in the .rel.plt section. */
5317 rel.r_offset = (gotplt->output_section->vma
5318 + gotplt->output_offset
5320 if (h->dynindx == -1
5321 || ((bfd_link_executable (info)
5322 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5324 && h->type == STT_GNU_IFUNC))
5326 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5327 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5328 in the .got.plt section. */
5329 bfd_put_32 (output_bfd,
5330 (h->root.u.def.value
5331 + h->root.u.def.section->output_section->vma
5332 + h->root.u.def.section->output_offset),
5333 gotplt->contents + got_offset);
5334 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5335 /* R_386_IRELATIVE comes last. */
5336 plt_index = htab->next_irelative_index--;
5340 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5341 plt_index = htab->next_jump_slot_index++;
5344 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5345 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5347 /* Don't fill PLT entry for static executables. */
5348 if (plt == htab->elf.splt)
5350 bfd_put_32 (output_bfd,
5351 plt_index * sizeof (Elf32_External_Rel),
5352 plt->contents + h->plt.offset
5353 + abed->plt->plt_reloc_offset);
5354 bfd_put_32 (output_bfd, - (h->plt.offset
5355 + abed->plt->plt_plt_offset + 4),
5356 plt->contents + h->plt.offset
5357 + abed->plt->plt_plt_offset);
5361 else if (eh->plt_got.offset != (bfd_vma) -1)
5363 bfd_vma got_offset, plt_offset;
5364 asection *plt, *got, *gotplt;
5365 const bfd_byte *got_plt_entry;
5367 /* Offset of displacement of the indirect jump. */
5368 bfd_vma plt_got_offset = 2;
5370 /* Set the entry in the GOT procedure linkage table. */
5371 plt = htab->plt_got;
5372 got = htab->elf.sgot;
5373 gotplt = htab->elf.sgotplt;
5374 got_offset = h->got.offset;
5376 if (got_offset == (bfd_vma) -1
5382 /* Fill in the entry in the GOT procedure linkage table. */
5383 if (! bfd_link_pic (info))
5385 got_plt_entry = elf_i386_got_plt_entry;
5386 got_offset += got->output_section->vma + got->output_offset;
5390 got_plt_entry = elf_i386_pic_got_plt_entry;
5391 got_offset += (got->output_section->vma
5392 + got->output_offset
5393 - gotplt->output_section->vma
5394 - gotplt->output_offset);
5397 plt_offset = eh->plt_got.offset;
5398 memcpy (plt->contents + plt_offset, got_plt_entry,
5399 sizeof (elf_i386_got_plt_entry));
5400 bfd_put_32 (output_bfd, got_offset,
5401 plt->contents + plt_offset + plt_got_offset);
5404 if (!local_undefweak
5406 && (h->plt.offset != (bfd_vma) -1
5407 || eh->plt_got.offset != (bfd_vma) -1))
5409 /* Mark the symbol as undefined, rather than as defined in
5410 the .plt section. Leave the value if there were any
5411 relocations where pointer equality matters (this is a clue
5412 for the dynamic linker, to make function pointer
5413 comparisons work between an application and shared
5414 library), otherwise set it to zero. If a function is only
5415 called from a binary, there is no need to slow down
5416 shared libraries because of that. */
5417 sym->st_shndx = SHN_UNDEF;
5418 if (!h->pointer_equality_needed)
5422 /* Don't generate dynamic GOT relocation against undefined weak
5423 symbol in executable. */
5424 if (h->got.offset != (bfd_vma) -1
5425 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5426 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5427 && !local_undefweak)
5429 Elf_Internal_Rela rel;
5431 /* This symbol has an entry in the global offset table. Set it
5434 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5437 rel.r_offset = (htab->elf.sgot->output_section->vma
5438 + htab->elf.sgot->output_offset
5439 + (h->got.offset & ~(bfd_vma) 1));
5441 /* If this is a static link, or it is a -Bsymbolic link and the
5442 symbol is defined locally or was forced to be local because
5443 of a version file, we just want to emit a RELATIVE reloc.
5444 The entry in the global offset table will already have been
5445 initialized in the relocate_section function. */
5447 && h->type == STT_GNU_IFUNC)
5449 if (bfd_link_pic (info))
5451 /* Generate R_386_GLOB_DAT. */
5458 if (!h->pointer_equality_needed)
5461 /* For non-shared object, we can't use .got.plt, which
5462 contains the real function addres if we need pointer
5463 equality. We load the GOT entry with the PLT entry. */
5464 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5465 bfd_put_32 (output_bfd,
5466 (plt->output_section->vma
5467 + plt->output_offset + h->plt.offset),
5468 htab->elf.sgot->contents + h->got.offset);
5472 else if (bfd_link_pic (info)
5473 && SYMBOL_REFERENCES_LOCAL (info, h))
5475 BFD_ASSERT((h->got.offset & 1) != 0);
5476 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5480 BFD_ASSERT((h->got.offset & 1) == 0);
5482 bfd_put_32 (output_bfd, (bfd_vma) 0,
5483 htab->elf.sgot->contents + h->got.offset);
5484 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5487 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5492 Elf_Internal_Rela rel;
5494 /* This symbol needs a copy reloc. Set it up. */
5496 if (h->dynindx == -1
5497 || (h->root.type != bfd_link_hash_defined
5498 && h->root.type != bfd_link_hash_defweak)
5499 || htab->srelbss == NULL)
5502 rel.r_offset = (h->root.u.def.value
5503 + h->root.u.def.section->output_section->vma
5504 + h->root.u.def.section->output_offset);
5505 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5506 elf_append_rel (output_bfd, htab->srelbss, &rel);
5512 /* Finish up local dynamic symbol handling. We set the contents of
5513 various dynamic sections here. */
5516 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5518 struct elf_link_hash_entry *h
5519 = (struct elf_link_hash_entry *) *slot;
5520 struct bfd_link_info *info
5521 = (struct bfd_link_info *) inf;
5523 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5527 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5528 here since undefined weak symbol may not be dynamic and may not be
5529 called for elf_i386_finish_dynamic_symbol. */
5532 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5535 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5536 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5538 if (h->root.type != bfd_link_hash_undefweak
5539 || h->dynindx != -1)
5542 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5546 /* Used to decide how to sort relocs in an optimal manner for the
5547 dynamic linker, before writing them out. */
5549 static enum elf_reloc_type_class
5550 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5551 const asection *rel_sec ATTRIBUTE_UNUSED,
5552 const Elf_Internal_Rela *rela)
5554 bfd *abfd = info->output_bfd;
5555 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5556 struct elf_link_hash_table *htab = elf_hash_table (info);
5558 if (htab->dynsym != NULL
5559 && htab->dynsym->contents != NULL)
5561 /* Check relocation against STT_GNU_IFUNC symbol if there are
5563 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5564 if (r_symndx != STN_UNDEF)
5566 Elf_Internal_Sym sym;
5567 if (!bed->s->swap_symbol_in (abfd,
5568 (htab->dynsym->contents
5569 + r_symndx * sizeof (Elf32_External_Sym)),
5573 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5574 return reloc_class_ifunc;
5578 switch (ELF32_R_TYPE (rela->r_info))
5580 case R_386_IRELATIVE:
5581 return reloc_class_ifunc;
5582 case R_386_RELATIVE:
5583 return reloc_class_relative;
5584 case R_386_JUMP_SLOT:
5585 return reloc_class_plt;
5587 return reloc_class_copy;
5589 return reloc_class_normal;
5593 /* Finish up the dynamic sections. */
5596 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5597 struct bfd_link_info *info)
5599 struct elf_i386_link_hash_table *htab;
5602 const struct elf_i386_backend_data *abed;
5604 htab = elf_i386_hash_table (info);
5608 dynobj = htab->elf.dynobj;
5609 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5610 abed = get_elf_i386_backend_data (output_bfd);
5612 if (htab->elf.dynamic_sections_created)
5614 Elf32_External_Dyn *dyncon, *dynconend;
5616 if (sdyn == NULL || htab->elf.sgot == NULL)
5619 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5620 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5621 for (; dyncon < dynconend; dyncon++)
5623 Elf_Internal_Dyn dyn;
5626 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5631 if (abed->is_vxworks
5632 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5637 s = htab->elf.sgotplt;
5638 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5642 s = htab->elf.srelplt;
5643 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5647 s = htab->elf.srelplt;
5648 dyn.d_un.d_val = s->size;
5652 /* My reading of the SVR4 ABI indicates that the
5653 procedure linkage table relocs (DT_JMPREL) should be
5654 included in the overall relocs (DT_REL). This is
5655 what Solaris does. However, UnixWare can not handle
5656 that case. Therefore, we override the DT_RELSZ entry
5657 here to make it not include the JMPREL relocs. */
5658 s = htab->elf.srelplt;
5661 dyn.d_un.d_val -= s->size;
5665 /* We may not be using the standard ELF linker script.
5666 If .rel.plt is the first .rel section, we adjust
5667 DT_REL to not include it. */
5668 s = htab->elf.srelplt;
5671 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5673 dyn.d_un.d_ptr += s->size;
5677 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5680 /* Fill in the first entry in the procedure linkage table. */
5681 if (htab->elf.splt && htab->elf.splt->size > 0)
5683 if (bfd_link_pic (info))
5685 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5686 abed->plt->plt0_entry_size);
5687 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5688 abed->plt0_pad_byte,
5689 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5693 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5694 abed->plt->plt0_entry_size);
5695 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5696 abed->plt0_pad_byte,
5697 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5698 bfd_put_32 (output_bfd,
5699 (htab->elf.sgotplt->output_section->vma
5700 + htab->elf.sgotplt->output_offset
5702 htab->elf.splt->contents
5703 + abed->plt->plt0_got1_offset);
5704 bfd_put_32 (output_bfd,
5705 (htab->elf.sgotplt->output_section->vma
5706 + htab->elf.sgotplt->output_offset
5708 htab->elf.splt->contents
5709 + abed->plt->plt0_got2_offset);
5711 if (abed->is_vxworks)
5713 Elf_Internal_Rela rel;
5715 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5716 On IA32 we use REL relocations so the addend goes in
5717 the PLT directly. */
5718 rel.r_offset = (htab->elf.splt->output_section->vma
5719 + htab->elf.splt->output_offset
5720 + abed->plt->plt0_got1_offset);
5721 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5722 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5723 htab->srelplt2->contents);
5724 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5725 rel.r_offset = (htab->elf.splt->output_section->vma
5726 + htab->elf.splt->output_offset
5727 + abed->plt->plt0_got2_offset);
5728 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5729 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5730 htab->srelplt2->contents +
5731 sizeof (Elf32_External_Rel));
5735 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5736 really seem like the right value. */
5737 elf_section_data (htab->elf.splt->output_section)
5738 ->this_hdr.sh_entsize = 4;
5740 /* Correct the .rel.plt.unloaded relocations. */
5741 if (abed->is_vxworks && !bfd_link_pic (info))
5743 int num_plts = (htab->elf.splt->size
5744 / abed->plt->plt_entry_size) - 1;
5747 p = htab->srelplt2->contents;
5748 if (bfd_link_pic (info))
5749 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5751 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5753 for (; num_plts; num_plts--)
5755 Elf_Internal_Rela rel;
5756 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5757 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5758 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5759 p += sizeof (Elf32_External_Rel);
5761 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5762 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5763 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5764 p += sizeof (Elf32_External_Rel);
5770 if (htab->elf.sgotplt)
5772 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5774 (*_bfd_error_handler)
5775 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5779 /* Fill in the first three entries in the global offset table. */
5780 if (htab->elf.sgotplt->size > 0)
5782 bfd_put_32 (output_bfd,
5784 : sdyn->output_section->vma + sdyn->output_offset),
5785 htab->elf.sgotplt->contents);
5786 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5787 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5790 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5793 /* Adjust .eh_frame for .plt section. */
5794 if (htab->plt_eh_frame != NULL
5795 && htab->plt_eh_frame->contents != NULL)
5797 if (htab->elf.splt != NULL
5798 && htab->elf.splt->size != 0
5799 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5800 && htab->elf.splt->output_section != NULL
5801 && htab->plt_eh_frame->output_section != NULL)
5803 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5804 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5805 + htab->plt_eh_frame->output_offset
5806 + PLT_FDE_START_OFFSET;
5807 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5808 htab->plt_eh_frame->contents
5809 + PLT_FDE_START_OFFSET);
5811 if (htab->plt_eh_frame->sec_info_type
5812 == SEC_INFO_TYPE_EH_FRAME)
5814 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5816 htab->plt_eh_frame->contents))
5821 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5822 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5824 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5825 htab_traverse (htab->loc_hash_table,
5826 elf_i386_finish_local_dynamic_symbol,
5829 /* Fill PLT entries for undefined weak symbols in PIE. */
5830 if (bfd_link_pie (info))
5831 bfd_hash_traverse (&info->hash->table,
5832 elf_i386_pie_finish_undefweak_symbol,
5838 /* Return an array of PLT entry symbol values. */
5841 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5844 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5847 bfd_vma *plt_sym_val;
5849 bfd_byte *plt_contents;
5850 const struct elf_i386_backend_data *bed
5851 = get_elf_i386_backend_data (abfd);
5852 Elf_Internal_Shdr *hdr;
5854 /* Get the .plt section contents. */
5855 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5856 if (plt_contents == NULL)
5858 if (!bfd_get_section_contents (abfd, (asection *) plt,
5859 plt_contents, 0, plt->size))
5862 free (plt_contents);
5866 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5867 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5870 hdr = &elf_section_data (relplt)->this_hdr;
5871 count = relplt->size / hdr->sh_entsize;
5873 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5874 if (plt_sym_val == NULL)
5877 for (i = 0; i < count; i++)
5878 plt_sym_val[i] = -1;
5880 plt_offset = bed->plt->plt_entry_size;
5881 p = relplt->relocation;
5882 for (i = 0; i < count; i++, p++)
5886 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5887 if (p->howto == NULL)
5890 if (p->howto->type != R_386_JUMP_SLOT
5891 && p->howto->type != R_386_IRELATIVE)
5894 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5895 + bed->plt->plt_reloc_offset));
5896 reloc_index /= sizeof (Elf32_External_Rel);
5897 if (reloc_index < count)
5898 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5900 plt_offset += bed->plt->plt_entry_size;
5902 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5904 if (plt_offset >= plt->size)
5908 free (plt_contents);
5913 /* Similar to _bfd_elf_get_synthetic_symtab. */
5916 elf_i386_get_synthetic_symtab (bfd *abfd,
5923 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5924 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5925 dynsymcount, dynsyms, ret,
5927 elf_i386_get_plt_sym_val);
5930 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5933 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5935 if (h->plt.offset != (bfd_vma) -1
5937 && !h->pointer_equality_needed)
5940 return _bfd_elf_hash_symbol (h);
5943 #define TARGET_LITTLE_SYM i386_elf32_vec
5944 #define TARGET_LITTLE_NAME "elf32-i386"
5945 #define ELF_ARCH bfd_arch_i386
5946 #define ELF_TARGET_ID I386_ELF_DATA
5947 #define ELF_MACHINE_CODE EM_386
5948 #define ELF_MAXPAGESIZE 0x1000
5950 #define elf_backend_can_gc_sections 1
5951 #define elf_backend_can_refcount 1
5952 #define elf_backend_want_got_plt 1
5953 #define elf_backend_plt_readonly 1
5954 #define elf_backend_want_plt_sym 0
5955 #define elf_backend_got_header_size 12
5956 #define elf_backend_plt_alignment 4
5957 #define elf_backend_extern_protected_data 1
5958 #define elf_backend_caches_rawsize 1
5960 /* Support RELA for objdump of prelink objects. */
5961 #define elf_info_to_howto elf_i386_info_to_howto_rel
5962 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5964 #define bfd_elf32_mkobject elf_i386_mkobject
5966 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5967 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5968 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5969 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5970 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5972 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5973 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5974 #define elf_backend_check_relocs elf_i386_check_relocs
5975 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5976 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5977 #define elf_backend_fake_sections elf_i386_fake_sections
5978 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5979 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5980 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5981 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5982 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5983 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5984 #define elf_backend_relocate_section elf_i386_relocate_section
5985 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5986 #define elf_backend_always_size_sections elf_i386_always_size_sections
5987 #define elf_backend_omit_section_dynsym \
5988 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5989 #define elf_backend_hash_symbol elf_i386_hash_symbol
5990 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
5992 #include "elf32-target.h"
5994 /* FreeBSD support. */
5996 #undef TARGET_LITTLE_SYM
5997 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5998 #undef TARGET_LITTLE_NAME
5999 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6001 #define ELF_OSABI ELFOSABI_FREEBSD
6003 /* The kernel recognizes executables as valid only if they carry a
6004 "FreeBSD" label in the ELF header. So we put this label on all
6005 executables and (for simplicity) also all other object files. */
6008 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6010 _bfd_elf_post_process_headers (abfd, info);
6012 #ifdef OLD_FREEBSD_ABI_LABEL
6014 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6015 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6016 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6021 #undef elf_backend_post_process_headers
6022 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6024 #define elf32_bed elf32_i386_fbsd_bed
6026 #undef elf_backend_add_symbol_hook
6028 #include "elf32-target.h"
6032 #undef TARGET_LITTLE_SYM
6033 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6034 #undef TARGET_LITTLE_NAME
6035 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6037 #undef elf_backend_post_process_headers
6039 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6040 objects won't be recognized. */
6044 #define elf32_bed elf32_i386_sol2_bed
6046 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6048 #undef elf_backend_static_tls_alignment
6049 #define elf_backend_static_tls_alignment 8
6051 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6053 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6055 #undef elf_backend_want_plt_sym
6056 #define elf_backend_want_plt_sym 1
6058 #undef elf_backend_strtab_flags
6059 #define elf_backend_strtab_flags SHF_STRINGS
6061 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6062 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6063 FALSE otherwise. ISECTION is the best guess matching section from the
6064 input bfd IBFD, but it might be NULL. */
6067 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6068 bfd *obfd ATTRIBUTE_UNUSED,
6069 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6070 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6072 /* PR 19938: FIXME: Need to add code for setting the sh_info
6073 and sh_link fields of Solaris specific section types. */
6076 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6077 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6079 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6081 The following values should be set:
6084 -----------------------------------------------------------------------------
6085 SHT_SUNW_ancillary The section header index of 0
6086 [0x6fffffee] the associated string table.
6088 SHT_SUNW_capinfo The section header index of For a dynamic object, the
6089 [0x6ffffff0] the associated symbol table. section header index of
6091 SHT_SUNW_capchain table,
6094 SHT_SUNW_symsort The section header index of 0
6095 [0x6ffffff1] the associated symbol table.
6097 SHT_SUNW_tlssort The section header index of 0
6098 [0x6ffffff2] the associated symbol table.
6100 SHT_SUNW_LDYNSYM The section header index of One greater than the
6101 [0x6ffffff3] the associated string table. symbol table index of the
6102 This index is the same string last local symbol,
6103 table used by the SHT_DYNSYM STB_LOCAL. Since
6104 section. SHT_SUNW_LDYNSYM only
6105 contains local symbols,
6106 sh_info is equivalent to
6107 the number of symbols in
6110 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6111 [0x6ffffff5] the section header index of to named strings, the
6112 the associated section header index of
6113 SHT_SUNW_capinfo table, the associated string
6114 otherwise 0. table, otherwise 0.
6116 SHT_SUNW_move The section header index of 0
6117 [0x6ffffffa] the associated symbol table.
6122 SHT_SUNW_syminfo The section header index of The section header index
6123 [0x6ffffffc] the associated symbol table. of the associated
6126 SHT_SUNW_verdef The section header index of The number of version
6127 [0x6ffffffd] the associated string table. definitions within the
6130 SHT_SUNW_verneed The section header index of The number of version
6131 [0x6ffffffe] the associated string table. dependencies within the
6134 SHT_SUNW_versym The section header index of 0
6135 [0x6fffffff] the associated symbol table. */
6138 #undef elf_backend_copy_special_section_fields
6139 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6141 #include "elf32-target.h"
6143 /* Intel MCU support. */
6146 elf32_iamcu_elf_object_p (bfd *abfd)
6148 /* Set the right machine number for an IAMCU elf32 file. */
6149 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6153 #undef TARGET_LITTLE_SYM
6154 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6155 #undef TARGET_LITTLE_NAME
6156 #define TARGET_LITTLE_NAME "elf32-iamcu"
6158 #define ELF_ARCH bfd_arch_iamcu
6160 #undef ELF_MACHINE_CODE
6161 #define ELF_MACHINE_CODE EM_IAMCU
6166 #define elf32_bed elf32_iamcu_bed
6168 #undef elf_backend_object_p
6169 #define elf_backend_object_p elf32_iamcu_elf_object_p
6171 #undef elf_backend_static_tls_alignment
6173 #undef elf_backend_want_plt_sym
6174 #define elf_backend_want_plt_sym 0
6176 #undef elf_backend_strtab_flags
6177 #undef elf_backend_copy_special_section_fields
6179 #include "elf32-target.h"
6181 /* Restore defaults. */
6183 #define ELF_ARCH bfd_arch_i386
6184 #undef ELF_MACHINE_CODE
6185 #define ELF_MACHINE_CODE EM_386
6187 /* Native Client support. */
6189 #undef TARGET_LITTLE_SYM
6190 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6191 #undef TARGET_LITTLE_NAME
6192 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6194 #define elf32_bed elf32_i386_nacl_bed
6196 #undef ELF_MAXPAGESIZE
6197 #define ELF_MAXPAGESIZE 0x10000
6199 /* Restore defaults. */
6201 #undef elf_backend_want_plt_sym
6202 #define elf_backend_want_plt_sym 0
6203 #undef elf_backend_post_process_headers
6204 #undef elf_backend_static_tls_alignment
6206 /* NaCl uses substantially different PLT entries for the same effects. */
6208 #undef elf_backend_plt_alignment
6209 #define elf_backend_plt_alignment 5
6210 #define NACL_PLT_ENTRY_SIZE 64
6211 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6213 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6215 0xff, 0x35, /* pushl contents of address */
6216 0, 0, 0, 0, /* replaced with address of .got + 4. */
6217 0x8b, 0x0d, /* movl contents of address, %ecx */
6218 0, 0, 0, 0, /* replaced with address of .got + 8. */
6219 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6220 0xff, 0xe1 /* jmp *%ecx */
6223 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6225 0x8b, 0x0d, /* movl contents of address, %ecx */
6226 0, 0, 0, 0, /* replaced with GOT slot address. */
6227 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6228 0xff, 0xe1, /* jmp *%ecx */
6230 /* Pad to the next 32-byte boundary with nop instructions. */
6232 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6233 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6235 /* Lazy GOT entries point here (32-byte aligned). */
6236 0x68, /* pushl immediate */
6237 0, 0, 0, 0, /* replaced with reloc offset. */
6238 0xe9, /* jmp relative */
6239 0, 0, 0, 0, /* replaced with offset to .plt. */
6241 /* Pad to the next 32-byte boundary with nop instructions. */
6242 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6243 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6247 static const bfd_byte
6248 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6250 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6251 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6252 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6253 0xff, 0xe1, /* jmp *%ecx */
6255 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6256 so pad to that size with nop instructions. */
6257 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6260 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6262 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6263 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6264 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6265 0xff, 0xe1, /* jmp *%ecx */
6267 /* Pad to the next 32-byte boundary with nop instructions. */
6269 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6270 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6272 /* Lazy GOT entries point here (32-byte aligned). */
6273 0x68, /* pushl immediate */
6274 0, 0, 0, 0, /* replaced with offset into relocation table. */
6275 0xe9, /* jmp relative */
6276 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6278 /* Pad to the next 32-byte boundary with nop instructions. */
6279 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6280 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6284 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6286 #if (PLT_CIE_LENGTH != 20 \
6287 || PLT_FDE_LENGTH != 36 \
6288 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6289 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6290 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6292 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6293 0, 0, 0, 0, /* CIE ID */
6294 1, /* CIE version */
6295 'z', 'R', 0, /* Augmentation string */
6296 1, /* Code alignment factor */
6297 0x7c, /* Data alignment factor: -4 */
6298 8, /* Return address column */
6299 1, /* Augmentation size */
6300 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6301 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6302 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6303 DW_CFA_nop, DW_CFA_nop,
6305 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6306 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6307 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6308 0, 0, 0, 0, /* .plt size goes here */
6309 0, /* Augmentation size */
6310 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6311 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6312 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6313 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6314 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6315 13, /* Block length */
6316 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6317 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6318 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6319 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6320 DW_CFA_nop, DW_CFA_nop
6323 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6325 elf_i386_nacl_plt0_entry, /* plt0_entry */
6326 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6327 2, /* plt0_got1_offset */
6328 8, /* plt0_got2_offset */
6329 elf_i386_nacl_plt_entry, /* plt_entry */
6330 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6331 2, /* plt_got_offset */
6332 33, /* plt_reloc_offset */
6333 38, /* plt_plt_offset */
6334 32, /* plt_lazy_offset */
6335 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6336 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6337 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6338 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6341 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6343 &elf_i386_nacl_plt, /* plt */
6344 0x90, /* plt0_pad_byte: nop insn */
6349 elf32_i386_nacl_elf_object_p (bfd *abfd)
6351 /* Set the right machine number for a NaCl i386 ELF32 file. */
6352 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6356 #undef elf_backend_arch_data
6357 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6359 #undef elf_backend_object_p
6360 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6361 #undef elf_backend_modify_segment_map
6362 #define elf_backend_modify_segment_map nacl_modify_segment_map
6363 #undef elf_backend_modify_program_headers
6364 #define elf_backend_modify_program_headers nacl_modify_program_headers
6365 #undef elf_backend_final_write_processing
6366 #define elf_backend_final_write_processing nacl_final_write_processing
6368 #include "elf32-target.h"
6370 /* Restore defaults. */
6371 #undef elf_backend_object_p
6372 #undef elf_backend_modify_segment_map
6373 #undef elf_backend_modify_program_headers
6374 #undef elf_backend_final_write_processing
6376 /* VxWorks support. */
6378 #undef TARGET_LITTLE_SYM
6379 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6380 #undef TARGET_LITTLE_NAME
6381 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6383 #undef elf_backend_plt_alignment
6384 #define elf_backend_plt_alignment 4
6386 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6388 &elf_i386_plt, /* plt */
6389 0x90, /* plt0_pad_byte */
6393 #undef elf_backend_arch_data
6394 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6396 #undef elf_backend_relocs_compatible
6397 #undef elf_backend_add_symbol_hook
6398 #define elf_backend_add_symbol_hook \
6399 elf_vxworks_add_symbol_hook
6400 #undef elf_backend_link_output_symbol_hook
6401 #define elf_backend_link_output_symbol_hook \
6402 elf_vxworks_link_output_symbol_hook
6403 #undef elf_backend_emit_relocs
6404 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6405 #undef elf_backend_final_write_processing
6406 #define elf_backend_final_write_processing \
6407 elf_vxworks_final_write_processing
6408 #undef elf_backend_static_tls_alignment
6410 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6412 #undef elf_backend_want_plt_sym
6413 #define elf_backend_want_plt_sym 1
6416 #define elf32_bed elf32_i386_vxworks_bed
6418 #include "elf32-target.h"