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 /* Reference count of C/C++ function pointer relocations in read-write
791 section which can be resolved at run-time. */
792 bfd_signed_vma func_pointer_refcount;
794 /* Information about the GOT PLT entry. Filled when there are both
795 GOT and PLT relocations against the same function. */
796 union gotplt_union plt_got;
798 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
799 starting at the end of the jump table. */
803 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
805 struct elf_i386_obj_tdata
807 struct elf_obj_tdata root;
809 /* tls_type for each local got entry. */
810 char *local_got_tls_type;
812 /* GOTPLT entries for TLS descriptors. */
813 bfd_vma *local_tlsdesc_gotent;
816 #define elf_i386_tdata(abfd) \
817 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
819 #define elf_i386_local_got_tls_type(abfd) \
820 (elf_i386_tdata (abfd)->local_got_tls_type)
822 #define elf_i386_local_tlsdesc_gotent(abfd) \
823 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
825 #define is_i386_elf(bfd) \
826 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
827 && elf_tdata (bfd) != NULL \
828 && elf_object_id (bfd) == I386_ELF_DATA)
831 elf_i386_mkobject (bfd *abfd)
833 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
837 /* i386 ELF linker hash table. */
839 struct elf_i386_link_hash_table
841 struct elf_link_hash_table elf;
843 /* Short-cuts to get to dynamic linker sections. */
847 asection *plt_eh_frame;
852 bfd_signed_vma refcount;
856 /* The amount of space used by the reserved portion of the sgotplt
857 section, plus whatever space is used by the jump slots. */
858 bfd_vma sgotplt_jump_table_size;
860 /* Small local sym cache. */
861 struct sym_cache sym_cache;
863 /* _TLS_MODULE_BASE_ symbol. */
864 struct bfd_link_hash_entry *tls_module_base;
866 /* Used by local STT_GNU_IFUNC symbols. */
867 htab_t loc_hash_table;
868 void * loc_hash_memory;
870 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
873 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
874 bfd_vma next_tls_desc_index;
876 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
877 bfd_vma next_jump_slot_index;
879 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
880 bfd_vma next_irelative_index;
882 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
883 to read-only sections. */
884 bfd_boolean readonly_dynrelocs_against_ifunc;
887 /* Get the i386 ELF linker hash table from a link_info structure. */
889 #define elf_i386_hash_table(p) \
890 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
891 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
893 #define elf_i386_compute_jump_table_size(htab) \
894 ((htab)->elf.srelplt->reloc_count * 4)
896 /* Create an entry in an i386 ELF linker hash table. */
898 static struct bfd_hash_entry *
899 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
900 struct bfd_hash_table *table,
903 /* Allocate the structure if it has not already been allocated by a
907 entry = (struct bfd_hash_entry *)
908 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
913 /* Call the allocation method of the superclass. */
914 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
917 struct elf_i386_link_hash_entry *eh;
919 eh = (struct elf_i386_link_hash_entry *) entry;
920 eh->dyn_relocs = NULL;
921 eh->tls_type = GOT_UNKNOWN;
923 eh->has_got_reloc = 0;
924 eh->has_non_got_reloc = 0;
925 eh->func_pointer_refcount = 0;
926 eh->plt_got.offset = (bfd_vma) -1;
927 eh->tlsdesc_got = (bfd_vma) -1;
933 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
934 for local symbol so that we can handle local STT_GNU_IFUNC symbols
935 as global symbol. We reuse indx and dynstr_index for local symbol
936 hash since they aren't used by global symbols in this backend. */
939 elf_i386_local_htab_hash (const void *ptr)
941 struct elf_link_hash_entry *h
942 = (struct elf_link_hash_entry *) ptr;
943 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
946 /* Compare local hash entries. */
949 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
951 struct elf_link_hash_entry *h1
952 = (struct elf_link_hash_entry *) ptr1;
953 struct elf_link_hash_entry *h2
954 = (struct elf_link_hash_entry *) ptr2;
956 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
959 /* Find and/or create a hash entry for local symbol. */
961 static struct elf_link_hash_entry *
962 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
963 bfd *abfd, const Elf_Internal_Rela *rel,
966 struct elf_i386_link_hash_entry e, *ret;
967 asection *sec = abfd->sections;
968 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
969 ELF32_R_SYM (rel->r_info));
972 e.elf.indx = sec->id;
973 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
974 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
975 create ? INSERT : NO_INSERT);
982 ret = (struct elf_i386_link_hash_entry *) *slot;
986 ret = (struct elf_i386_link_hash_entry *)
987 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
988 sizeof (struct elf_i386_link_hash_entry));
991 memset (ret, 0, sizeof (*ret));
992 ret->elf.indx = sec->id;
993 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
994 ret->elf.dynindx = -1;
995 ret->func_pointer_refcount = 0;
996 ret->plt_got.offset = (bfd_vma) -1;
1002 /* Destroy an i386 ELF linker hash table. */
1005 elf_i386_link_hash_table_free (bfd *obfd)
1007 struct elf_i386_link_hash_table *htab
1008 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1010 if (htab->loc_hash_table)
1011 htab_delete (htab->loc_hash_table);
1012 if (htab->loc_hash_memory)
1013 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1014 _bfd_elf_link_hash_table_free (obfd);
1017 /* Create an i386 ELF linker hash table. */
1019 static struct bfd_link_hash_table *
1020 elf_i386_link_hash_table_create (bfd *abfd)
1022 struct elf_i386_link_hash_table *ret;
1023 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1025 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1029 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1030 elf_i386_link_hash_newfunc,
1031 sizeof (struct elf_i386_link_hash_entry),
1038 ret->loc_hash_table = htab_try_create (1024,
1039 elf_i386_local_htab_hash,
1040 elf_i386_local_htab_eq,
1042 ret->loc_hash_memory = objalloc_create ();
1043 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1045 elf_i386_link_hash_table_free (abfd);
1048 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1050 return &ret->elf.root;
1053 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1054 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1058 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1060 struct elf_i386_link_hash_table *htab;
1062 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1065 htab = elf_i386_hash_table (info);
1069 /* Set the contents of the .interp section to the interpreter. */
1070 if (bfd_link_executable (info) && !info->nointerp)
1072 asection *s = bfd_get_linker_section (dynobj, ".interp");
1075 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1076 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1080 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1084 if (bfd_link_executable (info))
1086 /* Always allow copy relocs for building executables. */
1087 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1090 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1091 s = bfd_make_section_anyway_with_flags (dynobj,
1093 (bed->dynamic_sec_flags
1096 || ! bfd_set_section_alignment (dynobj, s,
1097 bed->s->log_file_align))
1103 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1104 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1108 if (!info->no_ld_generated_unwind_info
1109 && htab->plt_eh_frame == NULL
1110 && htab->elf.splt != NULL)
1112 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1113 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1114 | SEC_LINKER_CREATED);
1116 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1117 if (htab->plt_eh_frame == NULL
1118 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1125 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1128 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1129 struct elf_link_hash_entry *dir,
1130 struct elf_link_hash_entry *ind)
1132 struct elf_i386_link_hash_entry *edir, *eind;
1134 edir = (struct elf_i386_link_hash_entry *) dir;
1135 eind = (struct elf_i386_link_hash_entry *) ind;
1137 if (eind->dyn_relocs != NULL)
1139 if (edir->dyn_relocs != NULL)
1141 struct elf_dyn_relocs **pp;
1142 struct elf_dyn_relocs *p;
1144 /* Add reloc counts against the indirect sym to the direct sym
1145 list. Merge any entries against the same section. */
1146 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1148 struct elf_dyn_relocs *q;
1150 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1151 if (q->sec == p->sec)
1153 q->pc_count += p->pc_count;
1154 q->count += p->count;
1161 *pp = edir->dyn_relocs;
1164 edir->dyn_relocs = eind->dyn_relocs;
1165 eind->dyn_relocs = NULL;
1168 if (ind->root.type == bfd_link_hash_indirect
1169 && dir->got.refcount <= 0)
1171 edir->tls_type = eind->tls_type;
1172 eind->tls_type = GOT_UNKNOWN;
1175 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1176 generate a R_386_COPY reloc. */
1177 edir->gotoff_ref |= eind->gotoff_ref;
1179 edir->has_got_reloc |= eind->has_got_reloc;
1180 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1182 if (ELIMINATE_COPY_RELOCS
1183 && ind->root.type != bfd_link_hash_indirect
1184 && dir->dynamic_adjusted)
1186 /* If called to transfer flags for a weakdef during processing
1187 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1188 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1189 dir->ref_dynamic |= ind->ref_dynamic;
1190 dir->ref_regular |= ind->ref_regular;
1191 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1192 dir->needs_plt |= ind->needs_plt;
1193 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1197 if (eind->func_pointer_refcount > 0)
1199 edir->func_pointer_refcount += eind->func_pointer_refcount;
1200 eind->func_pointer_refcount = 0;
1203 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1207 /* Return TRUE if the TLS access code sequence support transition
1211 elf_i386_check_tls_transition (asection *sec,
1213 Elf_Internal_Shdr *symtab_hdr,
1214 struct elf_link_hash_entry **sym_hashes,
1215 unsigned int r_type,
1216 const Elf_Internal_Rela *rel,
1217 const Elf_Internal_Rela *relend)
1219 unsigned int val, type;
1220 unsigned long r_symndx;
1221 struct elf_link_hash_entry *h;
1224 offset = rel->r_offset;
1229 if (offset < 2 || (rel + 1) >= relend)
1232 type = bfd_get_8 (abfd, contents + offset - 2);
1233 if (r_type == R_386_TLS_GD)
1235 /* Check transition from GD access model. Only
1236 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1237 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1238 can transit to different access model. */
1239 if ((offset + 10) > sec->size ||
1240 (type != 0x8d && type != 0x04))
1243 val = bfd_get_8 (abfd, contents + offset - 1);
1246 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1250 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1253 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1258 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1259 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1262 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1268 /* Check transition from LD access model. Only
1269 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1270 can transit to different access model. */
1271 if (type != 0x8d || (offset + 9) > sec->size)
1274 val = bfd_get_8 (abfd, contents + offset - 1);
1275 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1279 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1282 r_symndx = ELF32_R_SYM (rel[1].r_info);
1283 if (r_symndx < symtab_hdr->sh_info)
1286 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1287 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1288 may be versioned. */
1290 && h->root.root.string != NULL
1291 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1292 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1293 && (strncmp (h->root.root.string, "___tls_get_addr",
1297 /* Check transition from IE access model:
1298 movl foo@indntpoff(%rip), %eax
1299 movl foo@indntpoff(%rip), %reg
1300 addl foo@indntpoff(%rip), %reg
1303 if (offset < 1 || (offset + 4) > sec->size)
1306 /* Check "movl foo@tpoff(%rip), %eax" first. */
1307 val = bfd_get_8 (abfd, contents + offset - 1);
1314 /* Check movl|addl foo@tpoff(%rip), %reg. */
1315 type = bfd_get_8 (abfd, contents + offset - 2);
1316 return ((type == 0x8b || type == 0x03)
1317 && (val & 0xc7) == 0x05);
1319 case R_386_TLS_GOTIE:
1320 case R_386_TLS_IE_32:
1321 /* Check transition from {IE_32,GOTIE} access model:
1322 subl foo@{tpoff,gontoff}(%reg1), %reg2
1323 movl foo@{tpoff,gontoff}(%reg1), %reg2
1324 addl foo@{tpoff,gontoff}(%reg1), %reg2
1327 if (offset < 2 || (offset + 4) > sec->size)
1330 val = bfd_get_8 (abfd, contents + offset - 1);
1331 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1334 type = bfd_get_8 (abfd, contents + offset - 2);
1335 return type == 0x8b || type == 0x2b || type == 0x03;
1337 case R_386_TLS_GOTDESC:
1338 /* Check transition from GDesc access model:
1339 leal x@tlsdesc(%ebx), %eax
1341 Make sure it's a leal adding ebx to a 32-bit offset
1342 into any register, although it's probably almost always
1345 if (offset < 2 || (offset + 4) > sec->size)
1348 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1351 val = bfd_get_8 (abfd, contents + offset - 1);
1352 return (val & 0xc7) == 0x83;
1354 case R_386_TLS_DESC_CALL:
1355 /* Check transition from GDesc access model:
1356 call *x@tlsdesc(%rax)
1358 if (offset + 2 <= sec->size)
1360 /* Make sure that it's a call *x@tlsdesc(%rax). */
1361 static const unsigned char call[] = { 0xff, 0x10 };
1362 return memcmp (contents + offset, call, 2) == 0;
1372 /* Return TRUE if the TLS access transition is OK or no transition
1373 will be performed. Update R_TYPE if there is a transition. */
1376 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1377 asection *sec, bfd_byte *contents,
1378 Elf_Internal_Shdr *symtab_hdr,
1379 struct elf_link_hash_entry **sym_hashes,
1380 unsigned int *r_type, int tls_type,
1381 const Elf_Internal_Rela *rel,
1382 const Elf_Internal_Rela *relend,
1383 struct elf_link_hash_entry *h,
1384 unsigned long r_symndx,
1385 bfd_boolean from_relocate_section)
1387 unsigned int from_type = *r_type;
1388 unsigned int to_type = from_type;
1389 bfd_boolean check = TRUE;
1391 /* Skip TLS transition for functions. */
1393 && (h->type == STT_FUNC
1394 || h->type == STT_GNU_IFUNC))
1400 case R_386_TLS_GOTDESC:
1401 case R_386_TLS_DESC_CALL:
1402 case R_386_TLS_IE_32:
1404 case R_386_TLS_GOTIE:
1405 if (bfd_link_executable (info))
1408 to_type = R_386_TLS_LE_32;
1409 else if (from_type != R_386_TLS_IE
1410 && from_type != R_386_TLS_GOTIE)
1411 to_type = R_386_TLS_IE_32;
1414 /* When we are called from elf_i386_relocate_section, there may
1415 be additional transitions based on TLS_TYPE. */
1416 if (from_relocate_section)
1418 unsigned int new_to_type = to_type;
1420 if (bfd_link_executable (info)
1423 && (tls_type & GOT_TLS_IE))
1424 new_to_type = R_386_TLS_LE_32;
1426 if (to_type == R_386_TLS_GD
1427 || to_type == R_386_TLS_GOTDESC
1428 || to_type == R_386_TLS_DESC_CALL)
1430 if (tls_type == GOT_TLS_IE_POS)
1431 new_to_type = R_386_TLS_GOTIE;
1432 else if (tls_type & GOT_TLS_IE)
1433 new_to_type = R_386_TLS_IE_32;
1436 /* We checked the transition before when we were called from
1437 elf_i386_check_relocs. We only want to check the new
1438 transition which hasn't been checked before. */
1439 check = new_to_type != to_type && from_type == to_type;
1440 to_type = new_to_type;
1446 if (bfd_link_executable (info))
1447 to_type = R_386_TLS_LE_32;
1454 /* Return TRUE if there is no transition. */
1455 if (from_type == to_type)
1458 /* Check if the transition can be performed. */
1460 && ! elf_i386_check_tls_transition (sec, contents,
1461 symtab_hdr, sym_hashes,
1462 from_type, rel, relend))
1464 reloc_howto_type *from, *to;
1467 from = elf_i386_rtype_to_howto (abfd, from_type);
1468 to = elf_i386_rtype_to_howto (abfd, to_type);
1471 name = h->root.root.string;
1474 struct elf_i386_link_hash_table *htab;
1476 htab = elf_i386_hash_table (info);
1481 Elf_Internal_Sym *isym;
1483 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1485 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1489 (*_bfd_error_handler)
1490 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1491 "in section `%A' failed"),
1492 abfd, sec, from->name, to->name, name,
1493 (unsigned long) rel->r_offset);
1494 bfd_set_error (bfd_error_bad_value);
1502 /* Rename some of the generic section flags to better document how they
1504 #define need_convert_load sec_flg0
1505 #define check_relocs_failed sec_flg1
1507 /* Look through the relocs for a section during the first phase, and
1508 calculate needed space in the global offset table, procedure linkage
1509 table, and dynamic reloc sections. */
1512 elf_i386_check_relocs (bfd *abfd,
1513 struct bfd_link_info *info,
1515 const Elf_Internal_Rela *relocs)
1517 struct elf_i386_link_hash_table *htab;
1518 Elf_Internal_Shdr *symtab_hdr;
1519 struct elf_link_hash_entry **sym_hashes;
1520 const Elf_Internal_Rela *rel;
1521 const Elf_Internal_Rela *rel_end;
1524 bfd_boolean use_plt_got;
1526 if (bfd_link_relocatable (info))
1529 BFD_ASSERT (is_i386_elf (abfd));
1531 htab = elf_i386_hash_table (info);
1534 sec->check_relocs_failed = 1;
1538 /* Get the section contents. */
1539 if (elf_section_data (sec)->this_hdr.contents != NULL)
1540 contents = elf_section_data (sec)->this_hdr.contents;
1541 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1543 sec->check_relocs_failed = 1;
1547 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1548 && (get_elf_i386_backend_data (abfd)
1549 == &elf_i386_arch_bed));
1551 symtab_hdr = &elf_symtab_hdr (abfd);
1552 sym_hashes = elf_sym_hashes (abfd);
1556 rel_end = relocs + sec->reloc_count;
1557 for (rel = relocs; rel < rel_end; rel++)
1559 unsigned int r_type;
1560 unsigned long r_symndx;
1561 struct elf_link_hash_entry *h;
1562 struct elf_i386_link_hash_entry *eh;
1563 Elf_Internal_Sym *isym;
1565 bfd_boolean size_reloc;
1567 r_symndx = ELF32_R_SYM (rel->r_info);
1568 r_type = ELF32_R_TYPE (rel->r_info);
1570 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1572 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1578 if (r_symndx < symtab_hdr->sh_info)
1580 /* A local symbol. */
1581 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1586 /* Check relocation against local STT_GNU_IFUNC symbol. */
1587 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1589 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1593 /* Fake a STT_GNU_IFUNC symbol. */
1594 h->type = STT_GNU_IFUNC;
1597 h->forced_local = 1;
1598 h->root.type = bfd_link_hash_defined;
1606 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1607 while (h->root.type == bfd_link_hash_indirect
1608 || h->root.type == bfd_link_hash_warning)
1609 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1612 eh = (struct elf_i386_link_hash_entry *) h;
1627 if (htab->elf.dynobj == NULL)
1628 htab->elf.dynobj = abfd;
1629 /* Create the ifunc sections for static executables. */
1630 if (h->type == STT_GNU_IFUNC
1631 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
1637 /* It is referenced by a non-shared object. */
1639 h->root.non_ir_ref = 1;
1641 if (h->type == STT_GNU_IFUNC)
1642 elf_tdata (info->output_bfd)->has_gnu_symbols
1643 |= elf_gnu_symbol_ifunc;
1646 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1647 symtab_hdr, sym_hashes,
1648 &r_type, GOT_UNKNOWN,
1649 rel, rel_end, h, r_symndx, FALSE))
1655 htab->tls_ldm_got.refcount += 1;
1659 /* This symbol requires a procedure linkage table entry. We
1660 actually build the entry in adjust_dynamic_symbol,
1661 because this might be a case of linking PIC code which is
1662 never referenced by a dynamic object, in which case we
1663 don't need to generate a procedure linkage table entry
1666 /* If this is a local symbol, we resolve it directly without
1667 creating a procedure linkage table entry. */
1671 eh->has_got_reloc = 1;
1673 h->plt.refcount += 1;
1680 case R_386_TLS_IE_32:
1682 case R_386_TLS_GOTIE:
1683 if (!bfd_link_executable (info))
1684 info->flags |= DF_STATIC_TLS;
1690 case R_386_TLS_GOTDESC:
1691 case R_386_TLS_DESC_CALL:
1692 /* This symbol requires a global offset table entry. */
1694 int tls_type, old_tls_type;
1701 tls_type = GOT_NORMAL;
1703 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1704 case R_386_TLS_GOTDESC:
1705 case R_386_TLS_DESC_CALL:
1706 tls_type = GOT_TLS_GDESC; break;
1707 case R_386_TLS_IE_32:
1708 if (ELF32_R_TYPE (rel->r_info) == r_type)
1709 tls_type = GOT_TLS_IE_NEG;
1711 /* If this is a GD->IE transition, we may use either of
1712 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1713 tls_type = GOT_TLS_IE;
1716 case R_386_TLS_GOTIE:
1717 tls_type = GOT_TLS_IE_POS; break;
1722 h->got.refcount += 1;
1723 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1727 bfd_signed_vma *local_got_refcounts;
1729 /* This is a global offset table entry for a local symbol. */
1730 local_got_refcounts = elf_local_got_refcounts (abfd);
1731 if (local_got_refcounts == NULL)
1735 size = symtab_hdr->sh_info;
1736 size *= (sizeof (bfd_signed_vma)
1737 + sizeof (bfd_vma) + sizeof(char));
1738 local_got_refcounts = (bfd_signed_vma *)
1739 bfd_zalloc (abfd, size);
1740 if (local_got_refcounts == NULL)
1742 elf_local_got_refcounts (abfd) = local_got_refcounts;
1743 elf_i386_local_tlsdesc_gotent (abfd)
1744 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1745 elf_i386_local_got_tls_type (abfd)
1746 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1748 local_got_refcounts[r_symndx] += 1;
1749 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1752 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1753 tls_type |= old_tls_type;
1754 /* If a TLS symbol is accessed using IE at least once,
1755 there is no point to use dynamic model for it. */
1756 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1757 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1758 || (tls_type & GOT_TLS_IE) == 0))
1760 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1761 tls_type = old_tls_type;
1762 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1763 && GOT_TLS_GD_ANY_P (tls_type))
1764 tls_type |= old_tls_type;
1768 name = h->root.root.string;
1770 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1772 (*_bfd_error_handler)
1773 (_("%B: `%s' accessed both as normal and "
1774 "thread local symbol"),
1776 bfd_set_error (bfd_error_bad_value);
1781 if (old_tls_type != tls_type)
1784 elf_i386_hash_entry (h)->tls_type = tls_type;
1786 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1794 if (htab->elf.sgot == NULL)
1796 if (htab->elf.dynobj == NULL)
1797 htab->elf.dynobj = abfd;
1798 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1801 if (r_type != R_386_TLS_IE)
1804 eh->has_got_reloc = 1;
1809 case R_386_TLS_LE_32:
1812 eh->has_got_reloc = 1;
1813 if (bfd_link_executable (info))
1815 info->flags |= DF_STATIC_TLS;
1820 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1821 eh->has_non_got_reloc = 1;
1823 /* STT_GNU_IFUNC symbol must go through PLT even if it is
1824 locally defined and undefined symbol may turn out to be
1825 a STT_GNU_IFUNC symbol later. */
1827 && (bfd_link_executable (info)
1828 || ((h->type == STT_GNU_IFUNC
1829 || h->root.type == bfd_link_hash_undefweak
1830 || h->root.type == bfd_link_hash_undefined)
1831 && SYMBOLIC_BIND (info, h))))
1833 /* If this reloc is in a read-only section, we might
1834 need a copy reloc. We can't check reliably at this
1835 stage whether the section is read-only, as input
1836 sections have not yet been mapped to output sections.
1837 Tentatively set the flag for now, and correct in
1838 adjust_dynamic_symbol. */
1841 /* We may need a .plt entry if the function this reloc
1842 refers to is in a shared lib. */
1843 h->plt.refcount += 1;
1844 if (r_type == R_386_PC32)
1846 /* Since something like ".long foo - ." may be used
1847 as pointer, make sure that PLT is used if foo is
1848 a function defined in a shared library. */
1849 if ((sec->flags & SEC_CODE) == 0)
1850 h->pointer_equality_needed = 1;
1854 h->pointer_equality_needed = 1;
1855 /* R_386_32 can be resolved at run-time. */
1856 if (r_type == R_386_32
1857 && (sec->flags & SEC_READONLY) == 0)
1858 eh->func_pointer_refcount += 1;
1864 /* If we are creating a shared library, and this is a reloc
1865 against a global symbol, or a non PC relative reloc
1866 against a local symbol, then we need to copy the reloc
1867 into the shared library. However, if we are linking with
1868 -Bsymbolic, we do not need to copy a reloc against a
1869 global symbol which is defined in an object we are
1870 including in the link (i.e., DEF_REGULAR is set). At
1871 this point we have not seen all the input files, so it is
1872 possible that DEF_REGULAR is not set now but will be set
1873 later (it is never cleared). In case of a weak definition,
1874 DEF_REGULAR may be cleared later by a strong definition in
1875 a shared library. We account for that possibility below by
1876 storing information in the relocs_copied field of the hash
1877 table entry. A similar situation occurs when creating
1878 shared libraries and symbol visibility changes render the
1881 If on the other hand, we are creating an executable, we
1882 may need to keep relocations for symbols satisfied by a
1883 dynamic library if we manage to avoid copy relocs for the
1885 if ((bfd_link_pic (info)
1886 && (sec->flags & SEC_ALLOC) != 0
1887 && (r_type != R_386_PC32
1889 && (! (bfd_link_pie (info)
1890 || SYMBOLIC_BIND (info, h))
1891 || h->root.type == bfd_link_hash_defweak
1892 || !h->def_regular))))
1893 || (ELIMINATE_COPY_RELOCS
1894 && !bfd_link_pic (info)
1895 && (sec->flags & SEC_ALLOC) != 0
1897 && (h->root.type == bfd_link_hash_defweak
1898 || !h->def_regular)))
1900 struct elf_dyn_relocs *p;
1901 struct elf_dyn_relocs **head;
1903 /* We must copy these reloc types into the output file.
1904 Create a reloc section in dynobj and make room for
1908 if (htab->elf.dynobj == NULL)
1909 htab->elf.dynobj = abfd;
1911 sreloc = _bfd_elf_make_dynamic_reloc_section
1912 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1918 /* If this is a global symbol, we count the number of
1919 relocations we need for this symbol. */
1922 head = &eh->dyn_relocs;
1926 /* Track dynamic relocs needed for local syms too.
1927 We really need local syms available to do this
1932 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1937 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1941 vpp = &elf_section_data (s)->local_dynrel;
1942 head = (struct elf_dyn_relocs **)vpp;
1946 if (p == NULL || p->sec != sec)
1948 bfd_size_type amt = sizeof *p;
1949 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1961 /* Count size relocation as PC-relative relocation. */
1962 if (r_type == R_386_PC32 || size_reloc)
1967 /* This relocation describes the C++ object vtable hierarchy.
1968 Reconstruct it for later use during GC. */
1969 case R_386_GNU_VTINHERIT:
1970 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1974 /* This relocation describes which C++ vtable entries are actually
1975 used. Record for later use during GC. */
1976 case R_386_GNU_VTENTRY:
1977 BFD_ASSERT (h != NULL);
1979 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1989 && h->plt.refcount > 0
1990 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1991 || h->got.refcount > 0)
1992 && htab->plt_got == NULL)
1994 /* Create the GOT procedure linkage table. */
1995 unsigned int plt_got_align;
1996 const struct elf_backend_data *bed;
1998 bed = get_elf_backend_data (info->output_bfd);
1999 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
2000 && (sizeof (elf_i386_got_plt_entry)
2001 == sizeof (elf_i386_pic_got_plt_entry)));
2004 if (htab->elf.dynobj == NULL)
2005 htab->elf.dynobj = abfd;
2007 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2009 (bed->dynamic_sec_flags
2014 if (htab->plt_got == NULL
2015 || !bfd_set_section_alignment (htab->elf.dynobj,
2021 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
2022 && (h == NULL || h->type != STT_GNU_IFUNC))
2023 sec->need_convert_load = 1;
2026 if (elf_section_data (sec)->this_hdr.contents != contents)
2028 if (!info->keep_memory)
2032 /* Cache the section contents for elf_link_input_bfd. */
2033 elf_section_data (sec)->this_hdr.contents = contents;
2040 if (elf_section_data (sec)->this_hdr.contents != contents)
2042 sec->check_relocs_failed = 1;
2046 /* Return the section that should be marked against GC for a given
2050 elf_i386_gc_mark_hook (asection *sec,
2051 struct bfd_link_info *info,
2052 Elf_Internal_Rela *rel,
2053 struct elf_link_hash_entry *h,
2054 Elf_Internal_Sym *sym)
2057 switch (ELF32_R_TYPE (rel->r_info))
2059 case R_386_GNU_VTINHERIT:
2060 case R_386_GNU_VTENTRY:
2064 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2067 /* Remove undefined weak symbol from the dynamic symbol table if it
2068 is resolved to 0. */
2071 elf_i386_fixup_symbol (struct bfd_link_info *info,
2072 struct elf_link_hash_entry *h)
2074 if (h->dynindx != -1
2075 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2076 elf_i386_hash_entry (h)->has_got_reloc,
2077 elf_i386_hash_entry (h)))
2080 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2086 /* Adjust a symbol defined by a dynamic object and referenced by a
2087 regular object. The current definition is in some section of the
2088 dynamic object, but we're not including those sections. We have to
2089 change the definition to something the rest of the link can
2093 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2094 struct elf_link_hash_entry *h)
2096 struct elf_i386_link_hash_table *htab;
2098 struct elf_i386_link_hash_entry *eh;
2099 struct elf_dyn_relocs *p;
2101 /* STT_GNU_IFUNC symbol must go through PLT. */
2102 if (h->type == STT_GNU_IFUNC)
2104 /* All local STT_GNU_IFUNC references must be treate as local
2105 calls via local PLT. */
2107 && SYMBOL_CALLS_LOCAL (info, h))
2109 bfd_size_type pc_count = 0, count = 0;
2110 struct elf_dyn_relocs **pp;
2112 eh = (struct elf_i386_link_hash_entry *) h;
2113 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2115 pc_count += p->pc_count;
2116 p->count -= p->pc_count;
2125 if (pc_count || count)
2129 if (h->plt.refcount <= 0)
2130 h->plt.refcount = 1;
2132 h->plt.refcount += 1;
2136 if (h->plt.refcount <= 0)
2138 h->plt.offset = (bfd_vma) -1;
2144 /* If this is a function, put it in the procedure linkage table. We
2145 will fill in the contents of the procedure linkage table later,
2146 when we know the address of the .got section. */
2147 if (h->type == STT_FUNC
2150 if (h->plt.refcount <= 0
2151 || SYMBOL_CALLS_LOCAL (info, h)
2152 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2153 && h->root.type == bfd_link_hash_undefweak))
2155 /* This case can occur if we saw a PLT32 reloc in an input
2156 file, but the symbol was never referred to by a dynamic
2157 object, or if all references were garbage collected. In
2158 such a case, we don't actually need to build a procedure
2159 linkage table, and we can just do a PC32 reloc instead. */
2160 h->plt.offset = (bfd_vma) -1;
2167 /* It's possible that we incorrectly decided a .plt reloc was
2168 needed for an R_386_PC32 reloc to a non-function sym in
2169 check_relocs. We can't decide accurately between function and
2170 non-function syms in check-relocs; Objects loaded later in
2171 the link may change h->type. So fix it now. */
2172 h->plt.offset = (bfd_vma) -1;
2174 /* If this is a weak symbol, and there is a real definition, the
2175 processor independent code will have arranged for us to see the
2176 real definition first, and we can just use the same value. */
2177 if (h->u.weakdef != NULL)
2179 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2180 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2181 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2182 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2183 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2184 h->non_got_ref = h->u.weakdef->non_got_ref;
2188 /* This is a reference to a symbol defined by a dynamic object which
2189 is not a function. */
2191 /* If we are creating a shared library, we must presume that the
2192 only references to the symbol are via the global offset table.
2193 For such cases we need not do anything here; the relocations will
2194 be handled correctly by relocate_section. */
2195 if (!bfd_link_executable (info))
2198 /* If there are no references to this symbol that do not use the
2199 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2201 eh = (struct elf_i386_link_hash_entry *) h;
2202 if (!h->non_got_ref && !eh->gotoff_ref)
2205 /* If -z nocopyreloc was given, we won't generate them either. */
2206 if (info->nocopyreloc)
2212 htab = elf_i386_hash_table (info);
2216 /* If there aren't any dynamic relocs in read-only sections nor
2217 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2218 avoid the copy reloc. This doesn't work on VxWorks, where we can
2219 not have dynamic relocations (other than copy and jump slot
2220 relocations) in an executable. */
2221 if (ELIMINATE_COPY_RELOCS
2223 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2225 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2227 s = p->sec->output_section;
2228 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2239 /* We must allocate the symbol in our .dynbss section, which will
2240 become part of the .bss section of the executable. There will be
2241 an entry for this symbol in the .dynsym section. The dynamic
2242 object will contain position independent code, so all references
2243 from the dynamic object to this symbol will go through the global
2244 offset table. The dynamic linker will use the .dynsym entry to
2245 determine the address it must put in the global offset table, so
2246 both the dynamic object and the regular object will refer to the
2247 same memory location for the variable. */
2249 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2250 copy the initial value out of the dynamic object and into the
2251 runtime process image. */
2252 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2254 htab->srelbss->size += sizeof (Elf32_External_Rel);
2260 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2263 /* Allocate space in .plt, .got and associated reloc sections for
2267 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2269 struct bfd_link_info *info;
2270 struct elf_i386_link_hash_table *htab;
2271 struct elf_i386_link_hash_entry *eh;
2272 struct elf_dyn_relocs *p;
2273 unsigned plt_entry_size;
2274 bfd_boolean resolved_to_zero;
2276 if (h->root.type == bfd_link_hash_indirect)
2279 eh = (struct elf_i386_link_hash_entry *) h;
2281 info = (struct bfd_link_info *) inf;
2282 htab = elf_i386_hash_table (info);
2286 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2288 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2292 /* Clear the reference count of function pointer relocations if
2293 symbol isn't a normal function. */
2294 if (h->type != STT_FUNC)
2295 eh->func_pointer_refcount = 0;
2297 /* We can't use the GOT PLT if pointer equality is needed since
2298 finish_dynamic_symbol won't clear symbol value and the dynamic
2299 linker won't update the GOT slot. We will get into an infinite
2300 loop at run-time. */
2301 if (htab->plt_got != NULL
2302 && h->type != STT_GNU_IFUNC
2303 && !h->pointer_equality_needed
2304 && h->plt.refcount > 0
2305 && h->got.refcount > 0)
2307 /* Don't use the regular PLT if there are both GOT and GOTPLT
2309 h->plt.offset = (bfd_vma) -1;
2311 /* Use the GOT PLT. */
2312 eh->plt_got.refcount = 1;
2315 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2316 here if it is defined and referenced in a non-shared object. */
2317 if (h->type == STT_GNU_IFUNC
2319 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2320 &htab->readonly_dynrelocs_against_ifunc,
2323 /* Don't create the PLT entry if there are only function pointer
2324 relocations which can be resolved at run-time. */
2325 else if (htab->elf.dynamic_sections_created
2326 && (h->plt.refcount > eh->func_pointer_refcount
2327 || eh->plt_got.refcount > 0))
2329 bfd_boolean use_plt_got;
2331 /* Clear the reference count of function pointer relocations
2333 eh->func_pointer_refcount = 0;
2335 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2337 /* Don't use the regular PLT for DF_BIND_NOW. */
2338 h->plt.offset = (bfd_vma) -1;
2340 /* Use the GOT PLT. */
2341 h->got.refcount = 1;
2342 eh->plt_got.refcount = 1;
2345 use_plt_got = eh->plt_got.refcount > 0;
2347 /* Make sure this symbol is output as a dynamic symbol.
2348 Undefined weak syms won't yet be marked as dynamic. */
2349 if (h->dynindx == -1
2351 && !resolved_to_zero)
2353 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2357 if (bfd_link_pic (info)
2358 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2360 asection *s = htab->elf.splt;
2361 asection *got_s = htab->plt_got;
2363 /* If this is the first .plt entry, make room for the special
2364 first entry. The .plt section is used by prelink to undo
2365 prelinking for dynamic relocations. */
2367 s->size = plt_entry_size;
2370 eh->plt_got.offset = got_s->size;
2372 h->plt.offset = s->size;
2374 /* If this symbol is not defined in a regular file, and we are
2375 not generating a shared library, then set the symbol to this
2376 location in the .plt. This is required to make function
2377 pointers compare as equal between the normal executable and
2378 the shared library. */
2379 if (! bfd_link_pic (info)
2384 /* We need to make a call to the entry of the GOT PLT
2385 instead of regular PLT entry. */
2386 h->root.u.def.section = got_s;
2387 h->root.u.def.value = eh->plt_got.offset;
2391 h->root.u.def.section = s;
2392 h->root.u.def.value = h->plt.offset;
2396 /* Make room for this entry. */
2398 got_s->size += sizeof (elf_i386_got_plt_entry);
2401 s->size += plt_entry_size;
2403 /* We also need to make an entry in the .got.plt section,
2404 which will be placed in the .got section by the linker
2406 htab->elf.sgotplt->size += 4;
2408 /* There should be no PLT relocation against resolved
2409 undefined weak symbol in executable. */
2410 if (!resolved_to_zero)
2412 /* We also need to make an entry in the .rel.plt
2414 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2415 htab->elf.srelplt->reloc_count++;
2419 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2420 && !bfd_link_pic (info))
2422 /* VxWorks has a second set of relocations for each PLT entry
2423 in executables. They go in a separate relocation section,
2424 which is processed by the kernel loader. */
2426 /* There are two relocations for the initial PLT entry: an
2427 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2428 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2430 if (h->plt.offset == plt_entry_size)
2431 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2433 /* There are two extra relocations for each subsequent PLT entry:
2434 an R_386_32 relocation for the GOT entry, and an R_386_32
2435 relocation for the PLT entry. */
2437 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2442 eh->plt_got.offset = (bfd_vma) -1;
2443 h->plt.offset = (bfd_vma) -1;
2449 eh->plt_got.offset = (bfd_vma) -1;
2450 h->plt.offset = (bfd_vma) -1;
2454 eh->tlsdesc_got = (bfd_vma) -1;
2456 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2457 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2458 if (h->got.refcount > 0
2459 && bfd_link_executable (info)
2461 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2462 h->got.offset = (bfd_vma) -1;
2463 else if (h->got.refcount > 0)
2467 int tls_type = elf_i386_hash_entry(h)->tls_type;
2469 /* Make sure this symbol is output as a dynamic symbol.
2470 Undefined weak syms won't yet be marked as dynamic. */
2471 if (h->dynindx == -1
2473 && !resolved_to_zero)
2475 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2480 if (GOT_TLS_GDESC_P (tls_type))
2482 eh->tlsdesc_got = htab->elf.sgotplt->size
2483 - elf_i386_compute_jump_table_size (htab);
2484 htab->elf.sgotplt->size += 8;
2485 h->got.offset = (bfd_vma) -2;
2487 if (! GOT_TLS_GDESC_P (tls_type)
2488 || GOT_TLS_GD_P (tls_type))
2490 h->got.offset = s->size;
2492 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2493 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2496 dyn = htab->elf.dynamic_sections_created;
2497 /* R_386_TLS_IE_32 needs one dynamic relocation,
2498 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2499 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2500 need two), R_386_TLS_GD needs one if local symbol and two if
2501 global. No dynamic relocation against resolved undefined weak
2502 symbol in executable. */
2503 if (tls_type == GOT_TLS_IE_BOTH)
2504 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2505 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2506 || (tls_type & GOT_TLS_IE))
2507 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2508 else if (GOT_TLS_GD_P (tls_type))
2509 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2510 else if (! GOT_TLS_GDESC_P (tls_type)
2511 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2512 && !resolved_to_zero)
2513 || h->root.type != bfd_link_hash_undefweak)
2514 && (bfd_link_pic (info)
2515 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2516 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2517 if (GOT_TLS_GDESC_P (tls_type))
2518 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2521 h->got.offset = (bfd_vma) -1;
2523 if (eh->dyn_relocs == NULL)
2526 /* In the shared -Bsymbolic case, discard space allocated for
2527 dynamic pc-relative relocs against symbols which turn out to be
2528 defined in regular objects. For the normal shared case, discard
2529 space for pc-relative relocs that have become local due to symbol
2530 visibility changes. */
2532 if (bfd_link_pic (info))
2534 /* The only reloc that uses pc_count is R_386_PC32, which will
2535 appear on a call or on something like ".long foo - .". We
2536 want calls to protected symbols to resolve directly to the
2537 function rather than going via the plt. If people want
2538 function pointer comparisons to work as expected then they
2539 should avoid writing assembly like ".long foo - .". */
2540 if (SYMBOL_CALLS_LOCAL (info, h))
2542 struct elf_dyn_relocs **pp;
2544 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2546 p->count -= p->pc_count;
2555 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2557 struct elf_dyn_relocs **pp;
2558 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2560 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2567 /* Also discard relocs on undefined weak syms with non-default
2568 visibility or in PIE. */
2569 if (eh->dyn_relocs != NULL
2570 && h->root.type == bfd_link_hash_undefweak)
2572 /* Undefined weak symbol is never bound locally in shared
2574 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2575 || resolved_to_zero)
2579 /* Keep dynamic non-GOT/non-PLT relocation so that we
2580 can branch to 0 without PLT. */
2581 struct elf_dyn_relocs **pp;
2583 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2584 if (p->pc_count == 0)
2588 /* Remove non-R_386_PC32 relocation. */
2589 p->count = p->pc_count;
2593 if (eh->dyn_relocs != NULL)
2595 /* Make sure undefined weak symbols are output
2596 as dynamic symbols in PIEs for dynamic non-GOT
2597 non-PLT reloations. */
2598 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2603 eh->dyn_relocs = NULL;
2605 else if (h->dynindx == -1
2606 && !h->forced_local)
2608 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2613 else if (ELIMINATE_COPY_RELOCS)
2615 /* For the non-shared case, discard space for relocs against
2616 symbols which turn out to need copy relocs or are not
2617 dynamic. Keep dynamic relocations for run-time function
2618 pointer initialization. */
2620 if ((!h->non_got_ref
2621 || eh->func_pointer_refcount > 0
2622 || (h->root.type == bfd_link_hash_undefweak
2623 && !resolved_to_zero))
2626 || (htab->elf.dynamic_sections_created
2627 && (h->root.type == bfd_link_hash_undefweak
2628 || h->root.type == bfd_link_hash_undefined))))
2630 /* Make sure this symbol is output as a dynamic symbol.
2631 Undefined weak syms won't yet be marked as dynamic. */
2632 if (h->dynindx == -1
2634 && !resolved_to_zero)
2636 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2640 /* If that succeeded, we know we'll be keeping all the
2642 if (h->dynindx != -1)
2646 eh->dyn_relocs = NULL;
2647 eh->func_pointer_refcount = 0;
2652 /* Finally, allocate space. */
2653 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2657 sreloc = elf_section_data (p->sec)->sreloc;
2659 BFD_ASSERT (sreloc != NULL);
2660 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2666 /* Allocate space in .plt, .got and associated reloc sections for
2667 local dynamic relocs. */
2670 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2672 struct elf_link_hash_entry *h
2673 = (struct elf_link_hash_entry *) *slot;
2675 if (h->type != STT_GNU_IFUNC
2679 || h->root.type != bfd_link_hash_defined)
2682 return elf_i386_allocate_dynrelocs (h, inf);
2685 /* Find any dynamic relocs that apply to read-only sections. */
2688 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2690 struct elf_i386_link_hash_entry *eh;
2691 struct elf_dyn_relocs *p;
2693 /* Skip local IFUNC symbols. */
2694 if (h->forced_local && h->type == STT_GNU_IFUNC)
2697 eh = (struct elf_i386_link_hash_entry *) h;
2698 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2700 asection *s = p->sec->output_section;
2702 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2704 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2706 info->flags |= DF_TEXTREL;
2708 if ((info->warn_shared_textrel && bfd_link_pic (info))
2709 || info->error_textrel)
2710 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2711 p->sec->owner, h->root.root.string,
2714 /* Not an error, just cut short the traversal. */
2721 /* With the local symbol, foo, we convert
2722 mov foo@GOT[(%reg1)], %reg2
2724 lea foo[@GOTOFF(%reg1)], %reg2
2726 call/jmp *foo@GOT[(%reg)]
2728 nop call foo/jmp foo nop
2729 When PIC is false, convert
2730 test %reg1, foo@GOT[(%reg2)]
2734 binop foo@GOT[(%reg1)], %reg2
2737 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2741 elf_i386_convert_load (bfd *abfd, asection *sec,
2742 struct bfd_link_info *link_info)
2744 Elf_Internal_Shdr *symtab_hdr;
2745 Elf_Internal_Rela *internal_relocs;
2746 Elf_Internal_Rela *irel, *irelend;
2748 struct elf_i386_link_hash_table *htab;
2749 bfd_boolean changed_contents;
2750 bfd_boolean changed_relocs;
2752 bfd_signed_vma *local_got_refcounts;
2754 /* Don't even try to convert non-ELF outputs. */
2755 if (!is_elf_hash_table (link_info->hash))
2758 /* Nothing to do if there is no need or no output. */
2759 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2760 || sec->need_convert_load == 0
2761 || bfd_is_abs_section (sec->output_section))
2764 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2766 /* Load the relocations for this section. */
2767 internal_relocs = (_bfd_elf_link_read_relocs
2768 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2769 link_info->keep_memory));
2770 if (internal_relocs == NULL)
2773 htab = elf_i386_hash_table (link_info);
2774 changed_contents = FALSE;
2775 changed_relocs = FALSE;
2776 local_got_refcounts = elf_local_got_refcounts (abfd);
2778 is_pic = bfd_link_pic (link_info);
2780 /* Get the section contents. */
2781 if (elf_section_data (sec)->this_hdr.contents != NULL)
2782 contents = elf_section_data (sec)->this_hdr.contents;
2785 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2789 irelend = internal_relocs + sec->reloc_count;
2790 for (irel = internal_relocs; irel < irelend; irel++)
2792 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2793 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2795 struct elf_link_hash_entry *h;
2796 unsigned int opcode;
2799 bfd_boolean baseless;
2800 Elf_Internal_Sym *isym;
2801 unsigned int addend;
2804 bfd_boolean to_reloc_32;
2806 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2809 roff = irel->r_offset;
2813 /* Addend for R_386_GOT32 and R_386_GOT32X relocations must be 0. */
2814 addend = bfd_get_32 (abfd, contents + roff);
2818 modrm = bfd_get_8 (abfd, contents + roff - 1);
2819 baseless = (modrm & 0xc7) == 0x5;
2821 if (r_type == R_386_GOT32X && baseless && is_pic)
2823 /* For PIC, disallow R_386_GOT32X without a base register
2824 since we don't know what the GOT base is. Allow
2825 R_386_GOT32 for existing object files. */
2828 if (r_symndx < symtab_hdr->sh_info)
2830 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2832 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2836 indx = r_symndx - symtab_hdr->sh_info;
2837 h = elf_sym_hashes (abfd)[indx];
2838 BFD_ASSERT (h != NULL);
2839 name = h->root.root.string;
2842 (*_bfd_error_handler)
2843 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2848 opcode = bfd_get_8 (abfd, contents + roff - 2);
2850 /* Convert mov to lea since it has been done for a while. */
2853 /* Only convert R_386_GOT32X relocation for call, jmp or
2854 one of adc, add, and, cmp, or, sbb, sub, test, xor
2856 if (r_type != R_386_GOT32X)
2860 /* Convert to R_386_32 if PIC is false or there is no base
2862 to_reloc_32 = !is_pic || baseless;
2864 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2865 referred to by the reloc. */
2866 if (r_symndx < symtab_hdr->sh_info)
2868 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2871 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2872 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2876 if (opcode == 0x0ff)
2877 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2878 goto convert_branch;
2880 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2881 "test %reg1, foo@GOT(%reg2)" and
2882 "binop foo@GOT[(%reg1)], %reg2". */
2886 indx = r_symndx - symtab_hdr->sh_info;
2887 h = elf_sym_hashes (abfd)[indx];
2888 BFD_ASSERT (h != NULL);
2890 while (h->root.type == bfd_link_hash_indirect
2891 || h->root.type == bfd_link_hash_warning)
2892 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2894 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2895 if (h->type == STT_GNU_IFUNC)
2898 /* Undefined weak symbol is only bound locally in executable
2899 and its reference is resolved as 0. */
2900 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
2901 elf_i386_hash_entry (h)))
2905 /* No direct branch to 0 for PIC. */
2909 goto convert_branch;
2913 /* We can convert load of address 0 to R_386_32. */
2921 /* We have "call/jmp *foo@GOT[(%reg)]". */
2922 if ((h->root.type == bfd_link_hash_defined
2923 || h->root.type == bfd_link_hash_defweak)
2924 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2926 /* The function is locally defined. */
2928 /* Convert R_386_GOT32X to R_386_PC32. */
2929 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
2931 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2934 nop = link_info->call_nop_byte;
2935 if (link_info->call_nop_as_suffix)
2937 nop_offset = roff + 3;
2938 irel->r_offset -= 1;
2941 nop_offset = roff - 2;
2945 /* Convert to "jmp foo nop". */
2948 nop_offset = roff + 3;
2949 irel->r_offset -= 1;
2952 bfd_put_8 (abfd, nop, contents + nop_offset);
2953 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2954 /* When converting to PC-relative relocation, we
2955 need to adjust addend by -4. */
2956 bfd_put_32 (abfd, -4, contents + irel->r_offset);
2957 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
2961 if (h->got.refcount > 0)
2962 h->got.refcount -= 1;
2966 if (local_got_refcounts != NULL
2967 && local_got_refcounts[r_symndx] > 0)
2968 local_got_refcounts[r_symndx] -= 1;
2971 changed_contents = TRUE;
2972 changed_relocs = TRUE;
2977 /* We have "mov foo@GOT[(%re1g)], %reg2",
2978 "test %reg1, foo@GOT(%reg2)" and
2979 "binop foo@GOT[(%reg1)], %reg2".
2981 Avoid optimizing _DYNAMIC since ld.so may use its
2982 link-time address. */
2983 if (h == htab->elf.hdynamic)
2986 /* def_regular is set by an assignment in a linker script in
2987 bfd_elf_record_link_assignment. */
2989 || h->root.type == bfd_link_hash_defined
2990 || h->root.type == bfd_link_hash_defweak)
2991 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2998 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
2999 "mov $foo, %reg2" with R_386_32. */
3001 modrm = 0xc0 | (modrm & 0x38) >> 3;
3002 bfd_put_8 (abfd, modrm, contents + roff - 1);
3007 /* Convert "mov foo@GOT(%reg1), %reg2" to
3008 "lea foo@GOTOFF(%reg1), %reg2". */
3009 r_type = R_386_GOTOFF;
3015 /* Only R_386_32 is supported. */
3021 /* Convert "test %reg1, foo@GOT(%reg2)" to
3022 "test $foo, %reg1". */
3023 modrm = 0xc0 | (modrm & 0x38) >> 3;
3028 /* Convert "binop foo@GOT(%reg1), %reg2" to
3029 "binop $foo, %reg2". */
3031 | (modrm & 0x38) >> 3
3035 bfd_put_8 (abfd, modrm, contents + roff - 1);
3039 bfd_put_8 (abfd, opcode, contents + roff - 2);
3040 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3044 if (h->got.refcount > 0)
3045 h->got.refcount -= 1;
3049 if (local_got_refcounts != NULL
3050 && local_got_refcounts[r_symndx] > 0)
3051 local_got_refcounts[r_symndx] -= 1;
3054 changed_contents = TRUE;
3055 changed_relocs = TRUE;
3060 if (contents != NULL
3061 && elf_section_data (sec)->this_hdr.contents != contents)
3063 if (!changed_contents && !link_info->keep_memory)
3067 /* Cache the section contents for elf_link_input_bfd. */
3068 elf_section_data (sec)->this_hdr.contents = contents;
3072 if (elf_section_data (sec)->relocs != internal_relocs)
3074 if (!changed_relocs)
3075 free (internal_relocs);
3077 elf_section_data (sec)->relocs = internal_relocs;
3083 if (contents != NULL
3084 && elf_section_data (sec)->this_hdr.contents != contents)
3086 if (internal_relocs != NULL
3087 && elf_section_data (sec)->relocs != internal_relocs)
3088 free (internal_relocs);
3092 /* Set the sizes of the dynamic sections. */
3095 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3097 struct elf_i386_link_hash_table *htab;
3103 htab = elf_i386_hash_table (info);
3106 dynobj = htab->elf.dynobj;
3110 /* Set up .got offsets for local syms, and space for local dynamic
3112 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3114 bfd_signed_vma *local_got;
3115 bfd_signed_vma *end_local_got;
3116 char *local_tls_type;
3117 bfd_vma *local_tlsdesc_gotent;
3118 bfd_size_type locsymcount;
3119 Elf_Internal_Shdr *symtab_hdr;
3122 if (! is_i386_elf (ibfd))
3125 for (s = ibfd->sections; s != NULL; s = s->next)
3127 struct elf_dyn_relocs *p;
3129 if (!elf_i386_convert_load (ibfd, s, info))
3132 for (p = ((struct elf_dyn_relocs *)
3133 elf_section_data (s)->local_dynrel);
3137 if (!bfd_is_abs_section (p->sec)
3138 && bfd_is_abs_section (p->sec->output_section))
3140 /* Input section has been discarded, either because
3141 it is a copy of a linkonce section or due to
3142 linker script /DISCARD/, so we'll be discarding
3145 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3146 && strcmp (p->sec->output_section->name,
3149 /* Relocations in vxworks .tls_vars sections are
3150 handled specially by the loader. */
3152 else if (p->count != 0)
3154 srel = elf_section_data (p->sec)->sreloc;
3155 srel->size += p->count * sizeof (Elf32_External_Rel);
3156 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3157 && (info->flags & DF_TEXTREL) == 0)
3159 info->flags |= DF_TEXTREL;
3160 if ((info->warn_shared_textrel && bfd_link_pic (info))
3161 || info->error_textrel)
3162 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3163 p->sec->owner, p->sec);
3169 local_got = elf_local_got_refcounts (ibfd);
3173 symtab_hdr = &elf_symtab_hdr (ibfd);
3174 locsymcount = symtab_hdr->sh_info;
3175 end_local_got = local_got + locsymcount;
3176 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3177 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3179 srel = htab->elf.srelgot;
3180 for (; local_got < end_local_got;
3181 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3183 *local_tlsdesc_gotent = (bfd_vma) -1;
3186 if (GOT_TLS_GDESC_P (*local_tls_type))
3188 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3189 - elf_i386_compute_jump_table_size (htab);
3190 htab->elf.sgotplt->size += 8;
3191 *local_got = (bfd_vma) -2;
3193 if (! GOT_TLS_GDESC_P (*local_tls_type)
3194 || GOT_TLS_GD_P (*local_tls_type))
3196 *local_got = s->size;
3198 if (GOT_TLS_GD_P (*local_tls_type)
3199 || *local_tls_type == GOT_TLS_IE_BOTH)
3202 if (bfd_link_pic (info)
3203 || GOT_TLS_GD_ANY_P (*local_tls_type)
3204 || (*local_tls_type & GOT_TLS_IE))
3206 if (*local_tls_type == GOT_TLS_IE_BOTH)
3207 srel->size += 2 * sizeof (Elf32_External_Rel);
3208 else if (GOT_TLS_GD_P (*local_tls_type)
3209 || ! GOT_TLS_GDESC_P (*local_tls_type))
3210 srel->size += sizeof (Elf32_External_Rel);
3211 if (GOT_TLS_GDESC_P (*local_tls_type))
3212 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3216 *local_got = (bfd_vma) -1;
3220 if (htab->tls_ldm_got.refcount > 0)
3222 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3224 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3225 htab->elf.sgot->size += 8;
3226 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3229 htab->tls_ldm_got.offset = -1;
3231 /* Allocate global sym .plt and .got entries, and space for global
3232 sym dynamic relocs. */
3233 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3235 /* Allocate .plt and .got entries, and space for local symbols. */
3236 htab_traverse (htab->loc_hash_table,
3237 elf_i386_allocate_local_dynrelocs,
3240 /* For every jump slot reserved in the sgotplt, reloc_count is
3241 incremented. However, when we reserve space for TLS descriptors,
3242 it's not incremented, so in order to compute the space reserved
3243 for them, it suffices to multiply the reloc count by the jump
3246 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3247 so that R_386_IRELATIVE entries come last. */
3248 if (htab->elf.srelplt)
3250 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3251 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3252 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3254 else if (htab->elf.irelplt)
3255 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3258 if (htab->elf.sgotplt)
3260 /* Don't allocate .got.plt section if there are no GOT nor PLT
3261 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3262 if ((htab->elf.hgot == NULL
3263 || !htab->elf.hgot->ref_regular_nonweak)
3264 && (htab->elf.sgotplt->size
3265 == get_elf_backend_data (output_bfd)->got_header_size)
3266 && (htab->elf.splt == NULL
3267 || htab->elf.splt->size == 0)
3268 && (htab->elf.sgot == NULL
3269 || htab->elf.sgot->size == 0)
3270 && (htab->elf.iplt == NULL
3271 || htab->elf.iplt->size == 0)
3272 && (htab->elf.igotplt == NULL
3273 || htab->elf.igotplt->size == 0))
3274 htab->elf.sgotplt->size = 0;
3278 if (htab->plt_eh_frame != NULL
3279 && htab->elf.splt != NULL
3280 && htab->elf.splt->size != 0
3281 && !bfd_is_abs_section (htab->elf.splt->output_section)
3282 && _bfd_elf_eh_frame_present (info))
3283 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3285 /* We now have determined the sizes of the various dynamic sections.
3286 Allocate memory for them. */
3288 for (s = dynobj->sections; s != NULL; s = s->next)
3290 bfd_boolean strip_section = TRUE;
3292 if ((s->flags & SEC_LINKER_CREATED) == 0)
3295 if (s == htab->elf.splt
3296 || s == htab->elf.sgot)
3298 /* Strip this section if we don't need it; see the
3300 /* We'd like to strip these sections if they aren't needed, but if
3301 we've exported dynamic symbols from them we must leave them.
3302 It's too late to tell BFD to get rid of the symbols. */
3304 if (htab->elf.hplt != NULL)
3305 strip_section = FALSE;
3307 else if (s == htab->elf.sgotplt
3308 || s == htab->elf.iplt
3309 || s == htab->elf.igotplt
3310 || s == htab->plt_got
3311 || s == htab->plt_eh_frame
3312 || s == htab->sdynbss)
3314 /* Strip these too. */
3316 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3319 && s != htab->elf.srelplt
3320 && s != htab->srelplt2)
3323 /* We use the reloc_count field as a counter if we need
3324 to copy relocs into the output file. */
3329 /* It's not one of our sections, so don't allocate space. */
3335 /* If we don't need this section, strip it from the
3336 output file. This is mostly to handle .rel.bss and
3337 .rel.plt. We must create both sections in
3338 create_dynamic_sections, because they must be created
3339 before the linker maps input sections to output
3340 sections. The linker does that before
3341 adjust_dynamic_symbol is called, and it is that
3342 function which decides whether anything needs to go
3343 into these sections. */
3345 s->flags |= SEC_EXCLUDE;
3349 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3352 /* Allocate memory for the section contents. We use bfd_zalloc
3353 here in case unused entries are not reclaimed before the
3354 section's contents are written out. This should not happen,
3355 but this way if it does, we get a R_386_NONE reloc instead
3357 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3358 if (s->contents == NULL)
3362 if (htab->plt_eh_frame != NULL
3363 && htab->plt_eh_frame->contents != NULL)
3365 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3366 sizeof (elf_i386_eh_frame_plt));
3367 bfd_put_32 (dynobj, htab->elf.splt->size,
3368 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3371 if (htab->elf.dynamic_sections_created)
3373 /* Add some entries to the .dynamic section. We fill in the
3374 values later, in elf_i386_finish_dynamic_sections, but we
3375 must add the entries now so that we get the correct size for
3376 the .dynamic section. The DT_DEBUG entry is filled in by the
3377 dynamic linker and used by the debugger. */
3378 #define add_dynamic_entry(TAG, VAL) \
3379 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3381 if (bfd_link_executable (info))
3383 if (!add_dynamic_entry (DT_DEBUG, 0))
3387 if (htab->elf.splt->size != 0)
3389 /* DT_PLTGOT is used by prelink even if there is no PLT
3391 if (!add_dynamic_entry (DT_PLTGOT, 0))
3394 if (htab->elf.srelplt->size != 0)
3396 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3397 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3398 || !add_dynamic_entry (DT_JMPREL, 0))
3405 if (!add_dynamic_entry (DT_REL, 0)
3406 || !add_dynamic_entry (DT_RELSZ, 0)
3407 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3410 /* If any dynamic relocs apply to a read-only section,
3411 then we need a DT_TEXTREL entry. */
3412 if ((info->flags & DF_TEXTREL) == 0)
3413 elf_link_hash_traverse (&htab->elf,
3414 elf_i386_readonly_dynrelocs, info);
3416 if ((info->flags & DF_TEXTREL) != 0)
3418 if (htab->readonly_dynrelocs_against_ifunc)
3420 info->callbacks->einfo
3421 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3422 bfd_set_error (bfd_error_bad_value);
3426 if (!add_dynamic_entry (DT_TEXTREL, 0))
3430 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3431 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3434 #undef add_dynamic_entry
3440 elf_i386_always_size_sections (bfd *output_bfd,
3441 struct bfd_link_info *info)
3443 asection *tls_sec = elf_hash_table (info)->tls_sec;
3447 struct elf_link_hash_entry *tlsbase;
3449 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3450 "_TLS_MODULE_BASE_",
3451 FALSE, FALSE, FALSE);
3453 if (tlsbase && tlsbase->type == STT_TLS)
3455 struct elf_i386_link_hash_table *htab;
3456 struct bfd_link_hash_entry *bh = NULL;
3457 const struct elf_backend_data *bed
3458 = get_elf_backend_data (output_bfd);
3460 htab = elf_i386_hash_table (info);
3464 if (!(_bfd_generic_link_add_one_symbol
3465 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3466 tls_sec, 0, NULL, FALSE,
3467 bed->collect, &bh)))
3470 htab->tls_module_base = bh;
3472 tlsbase = (struct elf_link_hash_entry *)bh;
3473 tlsbase->def_regular = 1;
3474 tlsbase->other = STV_HIDDEN;
3475 tlsbase->root.linker_def = 1;
3476 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3483 /* Set the correct type for an x86 ELF section. We do this by the
3484 section name, which is a hack, but ought to work. */
3487 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3488 Elf_Internal_Shdr *hdr,
3493 name = bfd_get_section_name (abfd, sec);
3495 /* This is an ugly, but unfortunately necessary hack that is
3496 needed when producing EFI binaries on x86. It tells
3497 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3498 containing ELF relocation info. We need this hack in order to
3499 be able to generate ELF binaries that can be translated into
3500 EFI applications (which are essentially COFF objects). Those
3501 files contain a COFF ".reloc" section inside an ELFNN object,
3502 which would normally cause BFD to segfault because it would
3503 attempt to interpret this section as containing relocation
3504 entries for section "oc". With this hack enabled, ".reloc"
3505 will be treated as a normal data section, which will avoid the
3506 segfault. However, you won't be able to create an ELFNN binary
3507 with a section named "oc" that needs relocations, but that's
3508 the kind of ugly side-effects you get when detecting section
3509 types based on their names... In practice, this limitation is
3510 unlikely to bite. */
3511 if (strcmp (name, ".reloc") == 0)
3512 hdr->sh_type = SHT_PROGBITS;
3517 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3518 executables. Rather than setting it to the beginning of the TLS
3519 section, we have to set it to the end. This function may be called
3520 multiple times, it is idempotent. */
3523 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3525 struct elf_i386_link_hash_table *htab;
3526 struct bfd_link_hash_entry *base;
3528 if (!bfd_link_executable (info))
3531 htab = elf_i386_hash_table (info);
3535 base = htab->tls_module_base;
3539 base->u.def.value = htab->elf.tls_size;
3542 /* Return the base VMA address which should be subtracted from real addresses
3543 when resolving @dtpoff relocation.
3544 This is PT_TLS segment p_vaddr. */
3547 elf_i386_dtpoff_base (struct bfd_link_info *info)
3549 /* If tls_sec is NULL, we should have signalled an error already. */
3550 if (elf_hash_table (info)->tls_sec == NULL)
3552 return elf_hash_table (info)->tls_sec->vma;
3555 /* Return the relocation value for @tpoff relocation
3556 if STT_TLS virtual address is ADDRESS. */
3559 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3561 struct elf_link_hash_table *htab = elf_hash_table (info);
3562 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3563 bfd_vma static_tls_size;
3565 /* If tls_sec is NULL, we should have signalled an error already. */
3566 if (htab->tls_sec == NULL)
3569 /* Consider special static TLS alignment requirements. */
3570 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3571 return static_tls_size + htab->tls_sec->vma - address;
3574 /* Relocate an i386 ELF section. */
3577 elf_i386_relocate_section (bfd *output_bfd,
3578 struct bfd_link_info *info,
3580 asection *input_section,
3582 Elf_Internal_Rela *relocs,
3583 Elf_Internal_Sym *local_syms,
3584 asection **local_sections)
3586 struct elf_i386_link_hash_table *htab;
3587 Elf_Internal_Shdr *symtab_hdr;
3588 struct elf_link_hash_entry **sym_hashes;
3589 bfd_vma *local_got_offsets;
3590 bfd_vma *local_tlsdesc_gotents;
3591 Elf_Internal_Rela *rel;
3592 Elf_Internal_Rela *wrel;
3593 Elf_Internal_Rela *relend;
3594 bfd_boolean is_vxworks_tls;
3595 unsigned plt_entry_size;
3597 BFD_ASSERT (is_i386_elf (input_bfd));
3599 /* Skip if check_relocs failed. */
3600 if (input_section->check_relocs_failed)
3603 htab = elf_i386_hash_table (info);
3606 symtab_hdr = &elf_symtab_hdr (input_bfd);
3607 sym_hashes = elf_sym_hashes (input_bfd);
3608 local_got_offsets = elf_local_got_offsets (input_bfd);
3609 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3610 /* We have to handle relocations in vxworks .tls_vars sections
3611 specially, because the dynamic loader is 'weird'. */
3612 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3613 && bfd_link_pic (info)
3614 && !strcmp (input_section->output_section->name,
3617 elf_i386_set_tls_module_base (info);
3619 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3621 rel = wrel = relocs;
3622 relend = relocs + input_section->reloc_count;
3623 for (; rel < relend; wrel++, rel++)
3625 unsigned int r_type;
3626 reloc_howto_type *howto;
3627 unsigned long r_symndx;
3628 struct elf_link_hash_entry *h;
3629 struct elf_i386_link_hash_entry *eh;
3630 Elf_Internal_Sym *sym;
3632 bfd_vma off, offplt, plt_offset;
3634 bfd_boolean unresolved_reloc;
3635 bfd_reloc_status_type r;
3639 asection *resolved_plt;
3640 bfd_boolean resolved_to_zero;
3642 r_type = ELF32_R_TYPE (rel->r_info);
3643 if (r_type == R_386_GNU_VTINHERIT
3644 || r_type == R_386_GNU_VTENTRY)
3651 if ((indx = r_type) >= R_386_standard
3652 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3653 >= R_386_ext - R_386_standard)
3654 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3655 >= R_386_ext2 - R_386_ext))
3657 (*_bfd_error_handler)
3658 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3659 input_bfd, input_section, r_type);
3660 bfd_set_error (bfd_error_bad_value);
3663 howto = elf_howto_table + indx;
3665 r_symndx = ELF32_R_SYM (rel->r_info);
3669 unresolved_reloc = FALSE;
3670 if (r_symndx < symtab_hdr->sh_info)
3672 sym = local_syms + r_symndx;
3673 sec = local_sections[r_symndx];
3674 relocation = (sec->output_section->vma
3675 + sec->output_offset
3677 st_size = sym->st_size;
3679 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3680 && ((sec->flags & SEC_MERGE) != 0
3681 || (bfd_link_relocatable (info)
3682 && sec->output_offset != 0)))
3685 bfd_byte *where = contents + rel->r_offset;
3687 switch (howto->size)
3690 addend = bfd_get_8 (input_bfd, where);
3691 if (howto->pc_relative)
3693 addend = (addend ^ 0x80) - 0x80;
3698 addend = bfd_get_16 (input_bfd, where);
3699 if (howto->pc_relative)
3701 addend = (addend ^ 0x8000) - 0x8000;
3706 addend = bfd_get_32 (input_bfd, where);
3707 if (howto->pc_relative)
3709 addend = (addend ^ 0x80000000) - 0x80000000;
3717 if (bfd_link_relocatable (info))
3718 addend += sec->output_offset;
3721 asection *msec = sec;
3722 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3724 addend -= relocation;
3725 addend += msec->output_section->vma + msec->output_offset;
3728 switch (howto->size)
3731 /* FIXME: overflow checks. */
3732 if (howto->pc_relative)
3734 bfd_put_8 (input_bfd, addend, where);
3737 if (howto->pc_relative)
3739 bfd_put_16 (input_bfd, addend, where);
3742 if (howto->pc_relative)
3744 bfd_put_32 (input_bfd, addend, where);
3748 else if (!bfd_link_relocatable (info)
3749 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3751 /* Relocate against local STT_GNU_IFUNC symbol. */
3752 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3757 /* Set STT_GNU_IFUNC symbol value. */
3758 h->root.u.def.value = sym->st_value;
3759 h->root.u.def.section = sec;
3764 bfd_boolean warned ATTRIBUTE_UNUSED;
3765 bfd_boolean ignored ATTRIBUTE_UNUSED;
3767 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3768 r_symndx, symtab_hdr, sym_hashes,
3770 unresolved_reloc, warned, ignored);
3774 if (sec != NULL && discarded_section (sec))
3776 _bfd_clear_contents (howto, input_bfd, input_section,
3777 contents + rel->r_offset);
3778 wrel->r_offset = rel->r_offset;
3782 /* For ld -r, remove relocations in debug sections against
3783 sections defined in discarded sections. Not done for
3784 eh_frame editing code expects to be present. */
3785 if (bfd_link_relocatable (info)
3786 && (input_section->flags & SEC_DEBUGGING))
3792 if (bfd_link_relocatable (info))
3799 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3800 it here if it is defined in a non-shared object. */
3802 && h->type == STT_GNU_IFUNC
3805 asection *plt, *gotplt, *base_got;
3809 if ((input_section->flags & SEC_ALLOC) == 0)
3811 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3812 sections because such sections are not SEC_ALLOC and
3813 thus ld.so will not process them. */
3814 if ((input_section->flags & SEC_DEBUGGING) != 0)
3818 else if (h->plt.offset == (bfd_vma) -1)
3821 /* STT_GNU_IFUNC symbol must go through PLT. */
3822 if (htab->elf.splt != NULL)
3824 plt = htab->elf.splt;
3825 gotplt = htab->elf.sgotplt;
3829 plt = htab->elf.iplt;
3830 gotplt = htab->elf.igotplt;
3833 relocation = (plt->output_section->vma
3834 + plt->output_offset + h->plt.offset);
3839 if (h->root.root.string)
3840 name = h->root.root.string;
3842 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3844 (*_bfd_error_handler)
3845 (_("%B: relocation %s against STT_GNU_IFUNC "
3846 "symbol `%s' isn't handled by %s"), input_bfd,
3847 elf_howto_table[r_type].name,
3848 name, __FUNCTION__);
3849 bfd_set_error (bfd_error_bad_value);
3853 /* Generate dynamic relcoation only when there is a
3854 non-GOT reference in a shared object. */
3855 if (bfd_link_pic (info) && h->non_got_ref)
3857 Elf_Internal_Rela outrel;
3861 /* Need a dynamic relocation to get the real function
3863 offset = _bfd_elf_section_offset (output_bfd,
3867 if (offset == (bfd_vma) -1
3868 || offset == (bfd_vma) -2)
3871 outrel.r_offset = (input_section->output_section->vma
3872 + input_section->output_offset
3875 if (h->dynindx == -1
3877 || bfd_link_executable (info))
3879 /* This symbol is resolved locally. */
3880 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3881 bfd_put_32 (output_bfd,
3882 (h->root.u.def.value
3883 + h->root.u.def.section->output_section->vma
3884 + h->root.u.def.section->output_offset),
3888 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3890 sreloc = htab->elf.irelifunc;
3891 elf_append_rel (output_bfd, sreloc, &outrel);
3893 /* If this reloc is against an external symbol, we
3894 do not want to fiddle with the addend. Otherwise,
3895 we need to include the symbol value so that it
3896 becomes an addend for the dynamic reloc. For an
3897 internal symbol, we have updated addend. */
3907 base_got = htab->elf.sgot;
3908 off = h->got.offset;
3910 if (base_got == NULL)
3913 if (off == (bfd_vma) -1)
3915 /* We can't use h->got.offset here to save state, or
3916 even just remember the offset, as finish_dynamic_symbol
3917 would use that as offset into .got. */
3919 if (htab->elf.splt != NULL)
3921 plt_index = h->plt.offset / plt_entry_size - 1;
3922 off = (plt_index + 3) * 4;
3923 base_got = htab->elf.sgotplt;
3927 plt_index = h->plt.offset / plt_entry_size;
3928 off = plt_index * 4;
3929 base_got = htab->elf.igotplt;
3932 if (h->dynindx == -1
3936 /* This references the local defitionion. We must
3937 initialize this entry in the global offset table.
3938 Since the offset must always be a multiple of 8,
3939 we use the least significant bit to record
3940 whether we have initialized it already.
3942 When doing a dynamic link, we create a .rela.got
3943 relocation entry to initialize the value. This
3944 is done in the finish_dynamic_symbol routine. */
3949 bfd_put_32 (output_bfd, relocation,
3950 base_got->contents + off);
3957 /* Adjust for static executables. */
3958 if (htab->elf.splt == NULL)
3959 relocation += gotplt->output_offset;
3963 relocation = (base_got->output_section->vma
3964 + base_got->output_offset + off
3965 - gotplt->output_section->vma
3966 - gotplt->output_offset);
3967 /* Adjust for static executables. */
3968 if (htab->elf.splt == NULL)
3969 relocation += gotplt->output_offset;
3975 relocation -= (gotplt->output_section->vma
3976 + gotplt->output_offset);
3981 eh = (struct elf_i386_link_hash_entry *) h;
3982 resolved_to_zero = (eh != NULL
3983 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3990 /* Avoid optimizing _DYNAMIC since ld.so may use its
3991 link-time address. */
3992 if (h == htab->elf.hdynamic)
3995 if (bfd_link_pic (info))
3997 /* It is OK to convert mov to lea and convert indirect
3998 branch to direct branch. It is OK to convert adc,
3999 add, and, cmp, or, sbb, sub, test, xor only when PIC
4001 unsigned int opcode, addend;
4002 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4005 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4006 if (opcode != 0x8b && opcode != 0xff)
4010 /* Resolve "mov GOT[(%reg)], %reg",
4011 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4012 and "binop foo@GOT[(%reg)], %reg". */
4014 || (h->plt.offset == (bfd_vma) -1
4015 && h->got.offset == (bfd_vma) -1)
4016 || htab->elf.sgotplt == NULL)
4019 offplt = (htab->elf.sgotplt->output_section->vma
4020 + htab->elf.sgotplt->output_offset);
4022 /* It is relative to .got.plt section. */
4023 if (h->got.offset != (bfd_vma) -1)
4024 /* Use GOT entry. Mask off the least significant bit in
4025 GOT offset which may be set by R_386_GOT32 processing
4027 relocation = (htab->elf.sgot->output_section->vma
4028 + htab->elf.sgot->output_offset
4029 + (h->got.offset & ~1) - offplt);
4031 /* Use GOTPLT entry. */
4032 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4034 if (!bfd_link_pic (info))
4036 /* If not PIC, add the .got.plt section address for
4037 baseless addressing. */
4039 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4040 if ((modrm & 0xc7) == 0x5)
4041 relocation += offplt;
4044 unresolved_reloc = FALSE;
4049 /* Relocation is to the entry for this symbol in the global
4051 if (htab->elf.sgot == NULL)
4058 off = h->got.offset;
4059 dyn = htab->elf.dynamic_sections_created;
4060 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4061 bfd_link_pic (info),
4063 || (bfd_link_pic (info)
4064 && SYMBOL_REFERENCES_LOCAL (info, h))
4065 || (ELF_ST_VISIBILITY (h->other)
4066 && h->root.type == bfd_link_hash_undefweak))
4068 /* This is actually a static link, or it is a
4069 -Bsymbolic link and the symbol is defined
4070 locally, or the symbol was forced to be local
4071 because of a version file. We must initialize
4072 this entry in the global offset table. Since the
4073 offset must always be a multiple of 4, we use the
4074 least significant bit to record whether we have
4075 initialized it already.
4077 When doing a dynamic link, we create a .rel.got
4078 relocation entry to initialize the value. This
4079 is done in the finish_dynamic_symbol routine. */
4084 bfd_put_32 (output_bfd, relocation,
4085 htab->elf.sgot->contents + off);
4090 unresolved_reloc = FALSE;
4094 if (local_got_offsets == NULL)
4097 off = local_got_offsets[r_symndx];
4099 /* The offset must always be a multiple of 4. We use
4100 the least significant bit to record whether we have
4101 already generated the necessary reloc. */
4106 bfd_put_32 (output_bfd, relocation,
4107 htab->elf.sgot->contents + off);
4109 if (bfd_link_pic (info))
4112 Elf_Internal_Rela outrel;
4114 s = htab->elf.srelgot;
4118 outrel.r_offset = (htab->elf.sgot->output_section->vma
4119 + htab->elf.sgot->output_offset
4121 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4122 elf_append_rel (output_bfd, s, &outrel);
4125 local_got_offsets[r_symndx] |= 1;
4129 if (off >= (bfd_vma) -2)
4132 relocation = htab->elf.sgot->output_section->vma
4133 + htab->elf.sgot->output_offset + off
4134 - htab->elf.sgotplt->output_section->vma
4135 - htab->elf.sgotplt->output_offset;
4139 /* Relocation is relative to the start of the global offset
4142 /* Check to make sure it isn't a protected function or data
4143 symbol for shared library since it may not be local when
4144 used as function address or with copy relocation. We also
4145 need to make sure that a symbol is referenced locally. */
4146 if (!bfd_link_executable (info) && h)
4148 if (!h->def_regular)
4152 switch (ELF_ST_VISIBILITY (h->other))
4155 v = _("hidden symbol");
4158 v = _("internal symbol");
4161 v = _("protected symbol");
4168 (*_bfd_error_handler)
4169 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4170 input_bfd, v, h->root.root.string);
4171 bfd_set_error (bfd_error_bad_value);
4174 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4175 && (h->type == STT_FUNC
4176 || h->type == STT_OBJECT)
4177 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4179 (*_bfd_error_handler)
4180 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4182 h->type == STT_FUNC ? "function" : "data",
4183 h->root.root.string);
4184 bfd_set_error (bfd_error_bad_value);
4189 /* Note that sgot is not involved in this
4190 calculation. We always want the start of .got.plt. If we
4191 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4192 permitted by the ABI, we might have to change this
4194 relocation -= htab->elf.sgotplt->output_section->vma
4195 + htab->elf.sgotplt->output_offset;
4199 /* Use global offset table as symbol value. */
4200 relocation = htab->elf.sgotplt->output_section->vma
4201 + htab->elf.sgotplt->output_offset;
4202 unresolved_reloc = FALSE;
4206 /* Relocation is to the entry for this symbol in the
4207 procedure linkage table. */
4209 /* Resolve a PLT32 reloc against a local symbol directly,
4210 without using the procedure linkage table. */
4214 if ((h->plt.offset == (bfd_vma) -1
4215 && eh->plt_got.offset == (bfd_vma) -1)
4216 || htab->elf.splt == NULL)
4218 /* We didn't make a PLT entry for this symbol. This
4219 happens when statically linking PIC code, or when
4220 using -Bsymbolic. */
4224 if (h->plt.offset != (bfd_vma) -1)
4226 resolved_plt = htab->elf.splt;
4227 plt_offset = h->plt.offset;
4231 resolved_plt = htab->plt_got;
4232 plt_offset = eh->plt_got.offset;
4235 relocation = (resolved_plt->output_section->vma
4236 + resolved_plt->output_offset
4238 unresolved_reloc = FALSE;
4242 /* Set to symbol size. */
4243 relocation = st_size;
4248 if ((input_section->flags & SEC_ALLOC) == 0
4252 /* Copy dynamic function pointer relocations. Don't generate
4253 dynamic relocations against resolved undefined weak symbols
4254 in PIE, except for R_386_PC32. */
4255 if ((bfd_link_pic (info)
4257 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4258 && (!resolved_to_zero
4259 || r_type == R_386_PC32))
4260 || h->root.type != bfd_link_hash_undefweak))
4261 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4262 || !SYMBOL_CALLS_LOCAL (info, h)))
4263 || (ELIMINATE_COPY_RELOCS
4264 && !bfd_link_pic (info)
4268 || eh->func_pointer_refcount > 0
4269 || (h->root.type == bfd_link_hash_undefweak
4270 && !resolved_to_zero))
4271 && ((h->def_dynamic && !h->def_regular)
4272 /* Undefined weak symbol is bound locally when
4274 || h->root.type == bfd_link_hash_undefweak)))
4276 Elf_Internal_Rela outrel;
4277 bfd_boolean skip, relocate;
4280 /* When generating a shared object, these relocations
4281 are copied into the output file to be resolved at run
4288 _bfd_elf_section_offset (output_bfd, info, input_section,
4290 if (outrel.r_offset == (bfd_vma) -1)
4292 else if (outrel.r_offset == (bfd_vma) -2)
4293 skip = TRUE, relocate = TRUE;
4294 outrel.r_offset += (input_section->output_section->vma
4295 + input_section->output_offset);
4298 memset (&outrel, 0, sizeof outrel);
4301 && (r_type == R_386_PC32
4302 || !(bfd_link_executable (info)
4303 || SYMBOLIC_BIND (info, h))
4304 || !h->def_regular))
4305 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4308 /* This symbol is local, or marked to become local. */
4310 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4313 sreloc = elf_section_data (input_section)->sreloc;
4315 if (sreloc == NULL || sreloc->contents == NULL)
4317 r = bfd_reloc_notsupported;
4318 goto check_relocation_error;
4321 elf_append_rel (output_bfd, sreloc, &outrel);
4323 /* If this reloc is against an external symbol, we do
4324 not want to fiddle with the addend. Otherwise, we
4325 need to include the symbol value so that it becomes
4326 an addend for the dynamic reloc. */
4333 if (!bfd_link_executable (info))
4335 Elf_Internal_Rela outrel;
4338 outrel.r_offset = rel->r_offset
4339 + input_section->output_section->vma
4340 + input_section->output_offset;
4341 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4342 sreloc = elf_section_data (input_section)->sreloc;
4345 elf_append_rel (output_bfd, sreloc, &outrel);
4350 case R_386_TLS_GOTDESC:
4351 case R_386_TLS_DESC_CALL:
4352 case R_386_TLS_IE_32:
4353 case R_386_TLS_GOTIE:
4354 tls_type = GOT_UNKNOWN;
4355 if (h == NULL && local_got_offsets)
4356 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4358 tls_type = elf_i386_hash_entry(h)->tls_type;
4359 if (tls_type == GOT_TLS_IE)
4360 tls_type = GOT_TLS_IE_NEG;
4362 if (! elf_i386_tls_transition (info, input_bfd,
4363 input_section, contents,
4364 symtab_hdr, sym_hashes,
4365 &r_type, tls_type, rel,
4366 relend, h, r_symndx, TRUE))
4369 if (r_type == R_386_TLS_LE_32)
4371 BFD_ASSERT (! unresolved_reloc);
4372 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4377 /* GD->LE transition. */
4378 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4381 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4383 movl %gs:0, %eax; subl $foo@tpoff, %eax
4384 (6 byte form of subl). */
4385 memcpy (contents + rel->r_offset - 3,
4386 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4387 roff = rel->r_offset + 5;
4391 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4393 movl %gs:0, %eax; subl $foo@tpoff, %eax
4394 (6 byte form of subl). */
4395 memcpy (contents + rel->r_offset - 2,
4396 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4397 roff = rel->r_offset + 6;
4399 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4401 /* Skip R_386_PC32/R_386_PLT32. */
4406 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4408 /* GDesc -> LE transition.
4409 It's originally something like:
4410 leal x@tlsdesc(%ebx), %eax
4414 Registers other than %eax may be set up here. */
4419 roff = rel->r_offset;
4420 val = bfd_get_8 (input_bfd, contents + roff - 1);
4422 /* Now modify the instruction as appropriate. */
4423 /* aoliva FIXME: remove the above and xor the byte
4425 bfd_put_8 (output_bfd, val ^ 0x86,
4426 contents + roff - 1);
4427 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4431 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4433 /* GDesc -> LE transition.
4441 roff = rel->r_offset;
4442 bfd_put_8 (output_bfd, 0x66, contents + roff);
4443 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4446 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4450 /* IE->LE transition:
4451 Originally it can be one of:
4459 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4462 /* movl foo, %eax. */
4463 bfd_put_8 (output_bfd, 0xb8,
4464 contents + rel->r_offset - 1);
4470 type = bfd_get_8 (input_bfd,
4471 contents + rel->r_offset - 2);
4476 bfd_put_8 (output_bfd, 0xc7,
4477 contents + rel->r_offset - 2);
4478 bfd_put_8 (output_bfd,
4479 0xc0 | ((val >> 3) & 7),
4480 contents + rel->r_offset - 1);
4484 bfd_put_8 (output_bfd, 0x81,
4485 contents + rel->r_offset - 2);
4486 bfd_put_8 (output_bfd,
4487 0xc0 | ((val >> 3) & 7),
4488 contents + rel->r_offset - 1);
4495 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4496 contents + rel->r_offset);
4501 unsigned int val, type;
4503 /* {IE_32,GOTIE}->LE transition:
4504 Originally it can be one of:
4505 subl foo(%reg1), %reg2
4506 movl foo(%reg1), %reg2
4507 addl foo(%reg1), %reg2
4510 movl $foo, %reg2 (6 byte form)
4511 addl $foo, %reg2. */
4512 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4513 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4517 bfd_put_8 (output_bfd, 0xc7,
4518 contents + rel->r_offset - 2);
4519 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4520 contents + rel->r_offset - 1);
4522 else if (type == 0x2b)
4525 bfd_put_8 (output_bfd, 0x81,
4526 contents + rel->r_offset - 2);
4527 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4528 contents + rel->r_offset - 1);
4530 else if (type == 0x03)
4533 bfd_put_8 (output_bfd, 0x81,
4534 contents + rel->r_offset - 2);
4535 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4536 contents + rel->r_offset - 1);
4540 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4541 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4542 contents + rel->r_offset);
4544 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4545 contents + rel->r_offset);
4550 if (htab->elf.sgot == NULL)
4555 off = h->got.offset;
4556 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4560 if (local_got_offsets == NULL)
4563 off = local_got_offsets[r_symndx];
4564 offplt = local_tlsdesc_gotents[r_symndx];
4571 Elf_Internal_Rela outrel;
4575 if (htab->elf.srelgot == NULL)
4578 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4580 if (GOT_TLS_GDESC_P (tls_type))
4583 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4584 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4585 <= htab->elf.sgotplt->size);
4586 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4587 + htab->elf.sgotplt->output_offset
4589 + htab->sgotplt_jump_table_size);
4590 sreloc = htab->elf.srelplt;
4591 loc = sreloc->contents;
4592 loc += (htab->next_tls_desc_index++
4593 * sizeof (Elf32_External_Rel));
4594 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4595 <= sreloc->contents + sreloc->size);
4596 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4599 BFD_ASSERT (! unresolved_reloc);
4600 bfd_put_32 (output_bfd,
4601 relocation - elf_i386_dtpoff_base (info),
4602 htab->elf.sgotplt->contents + offplt
4603 + htab->sgotplt_jump_table_size + 4);
4607 bfd_put_32 (output_bfd, 0,
4608 htab->elf.sgotplt->contents + offplt
4609 + htab->sgotplt_jump_table_size + 4);
4613 sreloc = htab->elf.srelgot;
4615 outrel.r_offset = (htab->elf.sgot->output_section->vma
4616 + htab->elf.sgot->output_offset + off);
4618 if (GOT_TLS_GD_P (tls_type))
4619 dr_type = R_386_TLS_DTPMOD32;
4620 else if (GOT_TLS_GDESC_P (tls_type))
4622 else if (tls_type == GOT_TLS_IE_POS)
4623 dr_type = R_386_TLS_TPOFF;
4625 dr_type = R_386_TLS_TPOFF32;
4627 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4628 bfd_put_32 (output_bfd,
4629 relocation - elf_i386_dtpoff_base (info),
4630 htab->elf.sgot->contents + off);
4631 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4632 bfd_put_32 (output_bfd,
4633 elf_i386_dtpoff_base (info) - relocation,
4634 htab->elf.sgot->contents + off);
4635 else if (dr_type != R_386_TLS_DESC)
4636 bfd_put_32 (output_bfd, 0,
4637 htab->elf.sgot->contents + off);
4638 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4640 elf_append_rel (output_bfd, sreloc, &outrel);
4642 if (GOT_TLS_GD_P (tls_type))
4646 BFD_ASSERT (! unresolved_reloc);
4647 bfd_put_32 (output_bfd,
4648 relocation - elf_i386_dtpoff_base (info),
4649 htab->elf.sgot->contents + off + 4);
4653 bfd_put_32 (output_bfd, 0,
4654 htab->elf.sgot->contents + off + 4);
4655 outrel.r_info = ELF32_R_INFO (indx,
4656 R_386_TLS_DTPOFF32);
4657 outrel.r_offset += 4;
4658 elf_append_rel (output_bfd, sreloc, &outrel);
4661 else if (tls_type == GOT_TLS_IE_BOTH)
4663 bfd_put_32 (output_bfd,
4665 ? relocation - elf_i386_dtpoff_base (info)
4667 htab->elf.sgot->contents + off + 4);
4668 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4669 outrel.r_offset += 4;
4670 elf_append_rel (output_bfd, sreloc, &outrel);
4677 local_got_offsets[r_symndx] |= 1;
4680 if (off >= (bfd_vma) -2
4681 && ! GOT_TLS_GDESC_P (tls_type))
4683 if (r_type == R_386_TLS_GOTDESC
4684 || r_type == R_386_TLS_DESC_CALL)
4686 relocation = htab->sgotplt_jump_table_size + offplt;
4687 unresolved_reloc = FALSE;
4689 else if (r_type == ELF32_R_TYPE (rel->r_info))
4691 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4692 + htab->elf.sgotplt->output_offset;
4693 relocation = htab->elf.sgot->output_section->vma
4694 + htab->elf.sgot->output_offset + off - g_o_t;
4695 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4696 && tls_type == GOT_TLS_IE_BOTH)
4698 if (r_type == R_386_TLS_IE)
4699 relocation += g_o_t;
4700 unresolved_reloc = FALSE;
4702 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4704 unsigned int val, type;
4707 /* GD->IE transition. */
4708 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4709 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4712 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4714 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4716 roff = rel->r_offset - 3;
4720 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4722 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4723 roff = rel->r_offset - 2;
4725 memcpy (contents + roff,
4726 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4727 contents[roff + 7] = 0x80 | (val & 7);
4728 /* If foo is used only with foo@gotntpoff(%reg) and
4729 foo@indntpoff, but not with foo@gottpoff(%reg), change
4730 subl $foo@gottpoff(%reg), %eax
4732 addl $foo@gotntpoff(%reg), %eax. */
4733 if (tls_type == GOT_TLS_IE_POS)
4734 contents[roff + 6] = 0x03;
4735 bfd_put_32 (output_bfd,
4736 htab->elf.sgot->output_section->vma
4737 + htab->elf.sgot->output_offset + off
4738 - htab->elf.sgotplt->output_section->vma
4739 - htab->elf.sgotplt->output_offset,
4740 contents + roff + 8);
4741 /* Skip R_386_PLT32. */
4746 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4748 /* GDesc -> IE transition.
4749 It's originally something like:
4750 leal x@tlsdesc(%ebx), %eax
4753 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4755 movl x@gottpoff(%ebx), %eax # before negl %eax
4757 Registers other than %eax may be set up here. */
4761 /* First, make sure it's a leal adding ebx to a 32-bit
4762 offset into any register, although it's probably
4763 almost always going to be eax. */
4764 roff = rel->r_offset;
4766 /* Now modify the instruction as appropriate. */
4767 /* To turn a leal into a movl in the form we use it, it
4768 suffices to change the first byte from 0x8d to 0x8b.
4769 aoliva FIXME: should we decide to keep the leal, all
4770 we have to do is remove the statement below, and
4771 adjust the relaxation of R_386_TLS_DESC_CALL. */
4772 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4774 if (tls_type == GOT_TLS_IE_BOTH)
4777 bfd_put_32 (output_bfd,
4778 htab->elf.sgot->output_section->vma
4779 + htab->elf.sgot->output_offset + off
4780 - htab->elf.sgotplt->output_section->vma
4781 - htab->elf.sgotplt->output_offset,
4785 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4787 /* GDesc -> IE transition.
4795 depending on how we transformed the TLS_GOTDESC above.
4800 roff = rel->r_offset;
4802 /* Now modify the instruction as appropriate. */
4803 if (tls_type != GOT_TLS_IE_NEG)
4806 bfd_put_8 (output_bfd, 0x66, contents + roff);
4807 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4812 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4813 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4823 if (! elf_i386_tls_transition (info, input_bfd,
4824 input_section, contents,
4825 symtab_hdr, sym_hashes,
4826 &r_type, GOT_UNKNOWN, rel,
4827 relend, h, r_symndx, TRUE))
4830 if (r_type != R_386_TLS_LDM)
4832 /* LD->LE transition:
4833 leal foo(%reg), %eax; call ___tls_get_addr.
4835 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4836 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4837 memcpy (contents + rel->r_offset - 2,
4838 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4839 /* Skip R_386_PC32/R_386_PLT32. */
4845 if (htab->elf.sgot == NULL)
4848 off = htab->tls_ldm_got.offset;
4853 Elf_Internal_Rela outrel;
4855 if (htab->elf.srelgot == NULL)
4858 outrel.r_offset = (htab->elf.sgot->output_section->vma
4859 + htab->elf.sgot->output_offset + off);
4861 bfd_put_32 (output_bfd, 0,
4862 htab->elf.sgot->contents + off);
4863 bfd_put_32 (output_bfd, 0,
4864 htab->elf.sgot->contents + off + 4);
4865 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4866 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4867 htab->tls_ldm_got.offset |= 1;
4869 relocation = htab->elf.sgot->output_section->vma
4870 + htab->elf.sgot->output_offset + off
4871 - htab->elf.sgotplt->output_section->vma
4872 - htab->elf.sgotplt->output_offset;
4873 unresolved_reloc = FALSE;
4876 case R_386_TLS_LDO_32:
4877 if (!bfd_link_executable (info)
4878 || (input_section->flags & SEC_CODE) == 0)
4879 relocation -= elf_i386_dtpoff_base (info);
4881 /* When converting LDO to LE, we must negate. */
4882 relocation = -elf_i386_tpoff (info, relocation);
4885 case R_386_TLS_LE_32:
4887 if (!bfd_link_executable (info))
4889 Elf_Internal_Rela outrel;
4892 outrel.r_offset = rel->r_offset
4893 + input_section->output_section->vma
4894 + input_section->output_offset;
4895 if (h != NULL && h->dynindx != -1)
4899 if (r_type == R_386_TLS_LE_32)
4900 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4902 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4903 sreloc = elf_section_data (input_section)->sreloc;
4906 elf_append_rel (output_bfd, sreloc, &outrel);
4909 else if (r_type == R_386_TLS_LE_32)
4910 relocation = elf_i386_dtpoff_base (info) - relocation;
4912 relocation -= elf_i386_dtpoff_base (info);
4914 else if (r_type == R_386_TLS_LE_32)
4915 relocation = elf_i386_tpoff (info, relocation);
4917 relocation = -elf_i386_tpoff (info, relocation);
4924 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4925 because such sections are not SEC_ALLOC and thus ld.so will
4926 not process them. */
4927 if (unresolved_reloc
4928 && !((input_section->flags & SEC_DEBUGGING) != 0
4930 && _bfd_elf_section_offset (output_bfd, info, input_section,
4931 rel->r_offset) != (bfd_vma) -1)
4933 (*_bfd_error_handler)
4934 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4937 (long) rel->r_offset,
4939 h->root.root.string);
4944 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4945 contents, rel->r_offset,
4948 check_relocation_error:
4949 if (r != bfd_reloc_ok)
4954 name = h->root.root.string;
4957 name = bfd_elf_string_from_elf_section (input_bfd,
4958 symtab_hdr->sh_link,
4963 name = bfd_section_name (input_bfd, sec);
4966 if (r == bfd_reloc_overflow)
4968 if (! ((*info->callbacks->reloc_overflow)
4969 (info, (h ? &h->root : NULL), name, howto->name,
4970 (bfd_vma) 0, input_bfd, input_section,
4976 (*_bfd_error_handler)
4977 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4978 input_bfd, input_section,
4979 (long) rel->r_offset, name, (int) r);
4990 Elf_Internal_Shdr *rel_hdr;
4991 size_t deleted = rel - wrel;
4993 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
4994 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4995 if (rel_hdr->sh_size == 0)
4997 /* It is too late to remove an empty reloc section. Leave
4999 ??? What is wrong with an empty section??? */
5000 rel_hdr->sh_size = rel_hdr->sh_entsize;
5003 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5004 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5005 input_section->reloc_count -= deleted;
5011 /* Finish up dynamic symbol handling. We set the contents of various
5012 dynamic sections here. */
5015 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5016 struct bfd_link_info *info,
5017 struct elf_link_hash_entry *h,
5018 Elf_Internal_Sym *sym)
5020 struct elf_i386_link_hash_table *htab;
5021 unsigned plt_entry_size;
5022 const struct elf_i386_backend_data *abed;
5023 struct elf_i386_link_hash_entry *eh;
5024 bfd_boolean local_undefweak;
5026 htab = elf_i386_hash_table (info);
5030 abed = get_elf_i386_backend_data (output_bfd);
5031 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5033 eh = (struct elf_i386_link_hash_entry *) h;
5035 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5036 resolved undefined weak symbols in executable so that their
5037 references have value 0 at run-time. */
5038 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5042 if (h->plt.offset != (bfd_vma) -1)
5046 Elf_Internal_Rela rel;
5048 asection *plt, *gotplt, *relplt;
5050 /* When building a static executable, use .iplt, .igot.plt and
5051 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5052 if (htab->elf.splt != NULL)
5054 plt = htab->elf.splt;
5055 gotplt = htab->elf.sgotplt;
5056 relplt = htab->elf.srelplt;
5060 plt = htab->elf.iplt;
5061 gotplt = htab->elf.igotplt;
5062 relplt = htab->elf.irelplt;
5065 /* This symbol has an entry in the procedure linkage table. Set
5068 if ((h->dynindx == -1
5070 && !((h->forced_local || bfd_link_executable (info))
5072 && h->type == STT_GNU_IFUNC))
5078 /* Get the index in the procedure linkage table which
5079 corresponds to this symbol. This is the index of this symbol
5080 in all the symbols for which we are making plt entries. The
5081 first entry in the procedure linkage table is reserved.
5083 Get the offset into the .got table of the entry that
5084 corresponds to this function. Each .got entry is 4 bytes.
5085 The first three are reserved.
5087 For static executables, we don't reserve anything. */
5089 if (plt == htab->elf.splt)
5091 got_offset = h->plt.offset / plt_entry_size - 1;
5092 got_offset = (got_offset + 3) * 4;
5096 got_offset = h->plt.offset / plt_entry_size;
5097 got_offset = got_offset * 4;
5100 /* Fill in the entry in the procedure linkage table. */
5101 if (! bfd_link_pic (info))
5103 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5104 abed->plt->plt_entry_size);
5105 bfd_put_32 (output_bfd,
5106 (gotplt->output_section->vma
5107 + gotplt->output_offset
5109 plt->contents + h->plt.offset
5110 + abed->plt->plt_got_offset);
5112 if (abed->is_vxworks)
5114 int s, k, reloc_index;
5116 /* Create the R_386_32 relocation referencing the GOT
5117 for this PLT entry. */
5119 /* S: Current slot number (zero-based). */
5120 s = ((h->plt.offset - abed->plt->plt_entry_size)
5121 / abed->plt->plt_entry_size);
5122 /* K: Number of relocations for PLTResolve. */
5123 if (bfd_link_pic (info))
5124 k = PLTRESOLVE_RELOCS_SHLIB;
5126 k = PLTRESOLVE_RELOCS;
5127 /* Skip the PLTresolve relocations, and the relocations for
5128 the other PLT slots. */
5129 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5130 loc = (htab->srelplt2->contents + reloc_index
5131 * sizeof (Elf32_External_Rel));
5133 rel.r_offset = (htab->elf.splt->output_section->vma
5134 + htab->elf.splt->output_offset
5135 + h->plt.offset + 2),
5136 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5137 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5139 /* Create the R_386_32 relocation referencing the beginning of
5140 the PLT for this GOT entry. */
5141 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5142 + htab->elf.sgotplt->output_offset
5144 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5145 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5146 loc + sizeof (Elf32_External_Rel));
5151 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5152 abed->plt->plt_entry_size);
5153 bfd_put_32 (output_bfd, got_offset,
5154 plt->contents + h->plt.offset
5155 + abed->plt->plt_got_offset);
5158 /* Fill in the entry in the global offset table. Leave the entry
5159 as zero for undefined weak symbol in PIE. No PLT relocation
5160 against undefined weak symbol in PIE. */
5161 if (!local_undefweak)
5163 bfd_put_32 (output_bfd,
5164 (plt->output_section->vma
5165 + plt->output_offset
5167 + abed->plt->plt_lazy_offset),
5168 gotplt->contents + got_offset);
5170 /* Fill in the entry in the .rel.plt section. */
5171 rel.r_offset = (gotplt->output_section->vma
5172 + gotplt->output_offset
5174 if (h->dynindx == -1
5175 || ((bfd_link_executable (info)
5176 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5178 && h->type == STT_GNU_IFUNC))
5180 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5181 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5182 in the .got.plt section. */
5183 bfd_put_32 (output_bfd,
5184 (h->root.u.def.value
5185 + h->root.u.def.section->output_section->vma
5186 + h->root.u.def.section->output_offset),
5187 gotplt->contents + got_offset);
5188 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5189 /* R_386_IRELATIVE comes last. */
5190 plt_index = htab->next_irelative_index--;
5194 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5195 plt_index = htab->next_jump_slot_index++;
5198 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5199 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5201 /* Don't fill PLT entry for static executables. */
5202 if (plt == htab->elf.splt)
5204 bfd_put_32 (output_bfd,
5205 plt_index * sizeof (Elf32_External_Rel),
5206 plt->contents + h->plt.offset
5207 + abed->plt->plt_reloc_offset);
5208 bfd_put_32 (output_bfd, - (h->plt.offset
5209 + abed->plt->plt_plt_offset + 4),
5210 plt->contents + h->plt.offset
5211 + abed->plt->plt_plt_offset);
5215 else if (eh->plt_got.offset != (bfd_vma) -1)
5217 bfd_vma got_offset, plt_offset;
5218 asection *plt, *got, *gotplt;
5219 const bfd_byte *got_plt_entry;
5221 /* Offset of displacement of the indirect jump. */
5222 bfd_vma plt_got_offset = 2;
5224 /* Set the entry in the GOT procedure linkage table. */
5225 plt = htab->plt_got;
5226 got = htab->elf.sgot;
5227 gotplt = htab->elf.sgotplt;
5228 got_offset = h->got.offset;
5230 if (got_offset == (bfd_vma) -1
5236 /* Fill in the entry in the GOT procedure linkage table. */
5237 if (! bfd_link_pic (info))
5239 got_plt_entry = elf_i386_got_plt_entry;
5240 got_offset += got->output_section->vma + got->output_offset;
5244 got_plt_entry = elf_i386_pic_got_plt_entry;
5245 got_offset += (got->output_section->vma
5246 + got->output_offset
5247 - gotplt->output_section->vma
5248 - gotplt->output_offset);
5251 plt_offset = eh->plt_got.offset;
5252 memcpy (plt->contents + plt_offset, got_plt_entry,
5253 sizeof (elf_i386_got_plt_entry));
5254 bfd_put_32 (output_bfd, got_offset,
5255 plt->contents + plt_offset + plt_got_offset);
5258 if (!local_undefweak
5260 && (h->plt.offset != (bfd_vma) -1
5261 || eh->plt_got.offset != (bfd_vma) -1))
5263 /* Mark the symbol as undefined, rather than as defined in
5264 the .plt section. Leave the value if there were any
5265 relocations where pointer equality matters (this is a clue
5266 for the dynamic linker, to make function pointer
5267 comparisons work between an application and shared
5268 library), otherwise set it to zero. If a function is only
5269 called from a binary, there is no need to slow down
5270 shared libraries because of that. */
5271 sym->st_shndx = SHN_UNDEF;
5272 if (!h->pointer_equality_needed)
5276 /* Don't generate dynamic GOT relocation against undefined weak
5277 symbol in executable. */
5278 if (h->got.offset != (bfd_vma) -1
5279 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5280 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5281 && !local_undefweak)
5283 Elf_Internal_Rela rel;
5285 /* This symbol has an entry in the global offset table. Set it
5288 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5291 rel.r_offset = (htab->elf.sgot->output_section->vma
5292 + htab->elf.sgot->output_offset
5293 + (h->got.offset & ~(bfd_vma) 1));
5295 /* If this is a static link, or it is a -Bsymbolic link and the
5296 symbol is defined locally or was forced to be local because
5297 of a version file, we just want to emit a RELATIVE reloc.
5298 The entry in the global offset table will already have been
5299 initialized in the relocate_section function. */
5301 && h->type == STT_GNU_IFUNC)
5303 if (bfd_link_pic (info))
5305 /* Generate R_386_GLOB_DAT. */
5312 if (!h->pointer_equality_needed)
5315 /* For non-shared object, we can't use .got.plt, which
5316 contains the real function addres if we need pointer
5317 equality. We load the GOT entry with the PLT entry. */
5318 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5319 bfd_put_32 (output_bfd,
5320 (plt->output_section->vma
5321 + plt->output_offset + h->plt.offset),
5322 htab->elf.sgot->contents + h->got.offset);
5326 else if (bfd_link_pic (info)
5327 && SYMBOL_REFERENCES_LOCAL (info, h))
5329 BFD_ASSERT((h->got.offset & 1) != 0);
5330 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5334 BFD_ASSERT((h->got.offset & 1) == 0);
5336 bfd_put_32 (output_bfd, (bfd_vma) 0,
5337 htab->elf.sgot->contents + h->got.offset);
5338 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5341 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5346 Elf_Internal_Rela rel;
5348 /* This symbol needs a copy reloc. Set it up. */
5350 if (h->dynindx == -1
5351 || (h->root.type != bfd_link_hash_defined
5352 && h->root.type != bfd_link_hash_defweak)
5353 || htab->srelbss == NULL)
5356 rel.r_offset = (h->root.u.def.value
5357 + h->root.u.def.section->output_section->vma
5358 + h->root.u.def.section->output_offset);
5359 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5360 elf_append_rel (output_bfd, htab->srelbss, &rel);
5366 /* Finish up local dynamic symbol handling. We set the contents of
5367 various dynamic sections here. */
5370 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5372 struct elf_link_hash_entry *h
5373 = (struct elf_link_hash_entry *) *slot;
5374 struct bfd_link_info *info
5375 = (struct bfd_link_info *) inf;
5377 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5381 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5382 here since undefined weak symbol may not be dynamic and may not be
5383 called for elf_i386_finish_dynamic_symbol. */
5386 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5389 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5390 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5392 if (h->root.type != bfd_link_hash_undefweak
5393 || h->dynindx != -1)
5396 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5400 /* Used to decide how to sort relocs in an optimal manner for the
5401 dynamic linker, before writing them out. */
5403 static enum elf_reloc_type_class
5404 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5405 const asection *rel_sec ATTRIBUTE_UNUSED,
5406 const Elf_Internal_Rela *rela)
5408 bfd *abfd = info->output_bfd;
5409 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5410 struct elf_link_hash_table *htab = elf_hash_table (info);
5412 if (htab->dynsym != NULL
5413 && htab->dynsym->contents != NULL)
5415 /* Check relocation against STT_GNU_IFUNC symbol if there are
5417 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5418 Elf_Internal_Sym sym;
5419 if (!bed->s->swap_symbol_in (abfd,
5420 (htab->dynsym->contents
5421 + r_symndx * sizeof (Elf32_External_Sym)),
5425 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5426 return reloc_class_ifunc;
5429 switch (ELF32_R_TYPE (rela->r_info))
5431 case R_386_RELATIVE:
5432 return reloc_class_relative;
5433 case R_386_JUMP_SLOT:
5434 return reloc_class_plt;
5436 return reloc_class_copy;
5438 return reloc_class_normal;
5442 /* Finish up the dynamic sections. */
5445 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5446 struct bfd_link_info *info)
5448 struct elf_i386_link_hash_table *htab;
5451 const struct elf_i386_backend_data *abed;
5453 htab = elf_i386_hash_table (info);
5457 dynobj = htab->elf.dynobj;
5458 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5459 abed = get_elf_i386_backend_data (output_bfd);
5461 if (htab->elf.dynamic_sections_created)
5463 Elf32_External_Dyn *dyncon, *dynconend;
5465 if (sdyn == NULL || htab->elf.sgot == NULL)
5468 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5469 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5470 for (; dyncon < dynconend; dyncon++)
5472 Elf_Internal_Dyn dyn;
5475 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5480 if (abed->is_vxworks
5481 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5486 s = htab->elf.sgotplt;
5487 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5491 s = htab->elf.srelplt;
5492 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5496 s = htab->elf.srelplt;
5497 dyn.d_un.d_val = s->size;
5501 /* My reading of the SVR4 ABI indicates that the
5502 procedure linkage table relocs (DT_JMPREL) should be
5503 included in the overall relocs (DT_REL). This is
5504 what Solaris does. However, UnixWare can not handle
5505 that case. Therefore, we override the DT_RELSZ entry
5506 here to make it not include the JMPREL relocs. */
5507 s = htab->elf.srelplt;
5510 dyn.d_un.d_val -= s->size;
5514 /* We may not be using the standard ELF linker script.
5515 If .rel.plt is the first .rel section, we adjust
5516 DT_REL to not include it. */
5517 s = htab->elf.srelplt;
5520 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5522 dyn.d_un.d_ptr += s->size;
5526 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5529 /* Fill in the first entry in the procedure linkage table. */
5530 if (htab->elf.splt && htab->elf.splt->size > 0)
5532 if (bfd_link_pic (info))
5534 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5535 abed->plt->plt0_entry_size);
5536 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5537 abed->plt0_pad_byte,
5538 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5542 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5543 abed->plt->plt0_entry_size);
5544 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5545 abed->plt0_pad_byte,
5546 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5547 bfd_put_32 (output_bfd,
5548 (htab->elf.sgotplt->output_section->vma
5549 + htab->elf.sgotplt->output_offset
5551 htab->elf.splt->contents
5552 + abed->plt->plt0_got1_offset);
5553 bfd_put_32 (output_bfd,
5554 (htab->elf.sgotplt->output_section->vma
5555 + htab->elf.sgotplt->output_offset
5557 htab->elf.splt->contents
5558 + abed->plt->plt0_got2_offset);
5560 if (abed->is_vxworks)
5562 Elf_Internal_Rela rel;
5564 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5565 On IA32 we use REL relocations so the addend goes in
5566 the PLT directly. */
5567 rel.r_offset = (htab->elf.splt->output_section->vma
5568 + htab->elf.splt->output_offset
5569 + abed->plt->plt0_got1_offset);
5570 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5571 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5572 htab->srelplt2->contents);
5573 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5574 rel.r_offset = (htab->elf.splt->output_section->vma
5575 + htab->elf.splt->output_offset
5576 + abed->plt->plt0_got2_offset);
5577 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5578 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5579 htab->srelplt2->contents +
5580 sizeof (Elf32_External_Rel));
5584 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5585 really seem like the right value. */
5586 elf_section_data (htab->elf.splt->output_section)
5587 ->this_hdr.sh_entsize = 4;
5589 /* Correct the .rel.plt.unloaded relocations. */
5590 if (abed->is_vxworks && !bfd_link_pic (info))
5592 int num_plts = (htab->elf.splt->size
5593 / abed->plt->plt_entry_size) - 1;
5596 p = htab->srelplt2->contents;
5597 if (bfd_link_pic (info))
5598 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5600 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5602 for (; num_plts; num_plts--)
5604 Elf_Internal_Rela rel;
5605 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5606 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5607 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5608 p += sizeof (Elf32_External_Rel);
5610 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5611 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5612 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5613 p += sizeof (Elf32_External_Rel);
5619 if (htab->elf.sgotplt)
5621 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5623 (*_bfd_error_handler)
5624 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5628 /* Fill in the first three entries in the global offset table. */
5629 if (htab->elf.sgotplt->size > 0)
5631 bfd_put_32 (output_bfd,
5633 : sdyn->output_section->vma + sdyn->output_offset),
5634 htab->elf.sgotplt->contents);
5635 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5636 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5639 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5642 /* Adjust .eh_frame for .plt section. */
5643 if (htab->plt_eh_frame != NULL
5644 && htab->plt_eh_frame->contents != NULL)
5646 if (htab->elf.splt != NULL
5647 && htab->elf.splt->size != 0
5648 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5649 && htab->elf.splt->output_section != NULL
5650 && htab->plt_eh_frame->output_section != NULL)
5652 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5653 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5654 + htab->plt_eh_frame->output_offset
5655 + PLT_FDE_START_OFFSET;
5656 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5657 htab->plt_eh_frame->contents
5658 + PLT_FDE_START_OFFSET);
5660 if (htab->plt_eh_frame->sec_info_type
5661 == SEC_INFO_TYPE_EH_FRAME)
5663 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5665 htab->plt_eh_frame->contents))
5670 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5671 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5673 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5674 htab_traverse (htab->loc_hash_table,
5675 elf_i386_finish_local_dynamic_symbol,
5678 /* Fill PLT entries for undefined weak symbols in PIE. */
5679 if (bfd_link_pie (info))
5680 bfd_hash_traverse (&info->hash->table,
5681 elf_i386_pie_finish_undefweak_symbol,
5687 /* Return an array of PLT entry symbol values. */
5690 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5693 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5696 bfd_vma *plt_sym_val;
5698 bfd_byte *plt_contents;
5699 const struct elf_i386_backend_data *bed
5700 = get_elf_i386_backend_data (abfd);
5701 Elf_Internal_Shdr *hdr;
5703 /* Get the .plt section contents. */
5704 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5705 if (plt_contents == NULL)
5707 if (!bfd_get_section_contents (abfd, (asection *) plt,
5708 plt_contents, 0, plt->size))
5711 free (plt_contents);
5715 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5716 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5719 hdr = &elf_section_data (relplt)->this_hdr;
5720 count = relplt->size / hdr->sh_entsize;
5722 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5723 if (plt_sym_val == NULL)
5726 for (i = 0; i < count; i++)
5727 plt_sym_val[i] = -1;
5729 plt_offset = bed->plt->plt_entry_size;
5730 p = relplt->relocation;
5731 for (i = 0; i < count; i++, p++)
5735 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5736 if (p->howto == NULL)
5739 if (p->howto->type != R_386_JUMP_SLOT
5740 && p->howto->type != R_386_IRELATIVE)
5743 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5744 + bed->plt->plt_reloc_offset));
5745 reloc_index /= sizeof (Elf32_External_Rel);
5746 if (reloc_index < count)
5747 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5749 plt_offset += bed->plt->plt_entry_size;
5751 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5753 if (plt_offset >= plt->size)
5757 free (plt_contents);
5762 /* Similar to _bfd_elf_get_synthetic_symtab. */
5765 elf_i386_get_synthetic_symtab (bfd *abfd,
5772 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5773 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5774 dynsymcount, dynsyms, ret,
5776 elf_i386_get_plt_sym_val);
5779 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5782 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5784 if (h->plt.offset != (bfd_vma) -1
5786 && !h->pointer_equality_needed)
5789 return _bfd_elf_hash_symbol (h);
5792 /* Hook called by the linker routine which adds symbols from an object
5796 elf_i386_add_symbol_hook (bfd * abfd,
5797 struct bfd_link_info * info,
5798 Elf_Internal_Sym * sym,
5799 const char ** namep ATTRIBUTE_UNUSED,
5800 flagword * flagsp ATTRIBUTE_UNUSED,
5801 asection ** secp ATTRIBUTE_UNUSED,
5802 bfd_vma * valp ATTRIBUTE_UNUSED)
5804 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5805 && (abfd->flags & DYNAMIC) == 0
5806 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5807 elf_tdata (info->output_bfd)->has_gnu_symbols
5808 |= elf_gnu_symbol_unique;
5813 #define TARGET_LITTLE_SYM i386_elf32_vec
5814 #define TARGET_LITTLE_NAME "elf32-i386"
5815 #define ELF_ARCH bfd_arch_i386
5816 #define ELF_TARGET_ID I386_ELF_DATA
5817 #define ELF_MACHINE_CODE EM_386
5818 #define ELF_MAXPAGESIZE 0x1000
5820 #define elf_backend_can_gc_sections 1
5821 #define elf_backend_can_refcount 1
5822 #define elf_backend_want_got_plt 1
5823 #define elf_backend_plt_readonly 1
5824 #define elf_backend_want_plt_sym 0
5825 #define elf_backend_got_header_size 12
5826 #define elf_backend_plt_alignment 4
5827 #define elf_backend_extern_protected_data 1
5828 #define elf_backend_caches_rawsize 1
5830 /* Support RELA for objdump of prelink objects. */
5831 #define elf_info_to_howto elf_i386_info_to_howto_rel
5832 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5834 #define bfd_elf32_mkobject elf_i386_mkobject
5836 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5837 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5838 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5839 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5840 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5842 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5843 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5844 #define elf_backend_check_relocs elf_i386_check_relocs
5845 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5846 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5847 #define elf_backend_fake_sections elf_i386_fake_sections
5848 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5849 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5850 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5851 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5852 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5853 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5854 #define elf_backend_relocate_section elf_i386_relocate_section
5855 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5856 #define elf_backend_always_size_sections elf_i386_always_size_sections
5857 #define elf_backend_omit_section_dynsym \
5858 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5859 #define elf_backend_hash_symbol elf_i386_hash_symbol
5860 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5861 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
5863 #include "elf32-target.h"
5865 /* FreeBSD support. */
5867 #undef TARGET_LITTLE_SYM
5868 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5869 #undef TARGET_LITTLE_NAME
5870 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5872 #define ELF_OSABI ELFOSABI_FREEBSD
5874 /* The kernel recognizes executables as valid only if they carry a
5875 "FreeBSD" label in the ELF header. So we put this label on all
5876 executables and (for simplicity) also all other object files. */
5879 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5881 _bfd_elf_post_process_headers (abfd, info);
5883 #ifdef OLD_FREEBSD_ABI_LABEL
5885 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5886 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5887 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5892 #undef elf_backend_post_process_headers
5893 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5895 #define elf32_bed elf32_i386_fbsd_bed
5897 #undef elf_backend_add_symbol_hook
5899 #include "elf32-target.h"
5903 #undef TARGET_LITTLE_SYM
5904 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5905 #undef TARGET_LITTLE_NAME
5906 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5908 #undef elf_backend_post_process_headers
5910 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5911 objects won't be recognized. */
5915 #define elf32_bed elf32_i386_sol2_bed
5917 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5919 #undef elf_backend_static_tls_alignment
5920 #define elf_backend_static_tls_alignment 8
5922 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5924 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5926 #undef elf_backend_want_plt_sym
5927 #define elf_backend_want_plt_sym 1
5929 #undef elf_backend_strtab_flags
5930 #define elf_backend_strtab_flags SHF_STRINGS
5932 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
5933 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
5934 FALSE otherwise. ISECTION is the best guess matching section from the
5935 input bfd IBFD, but it might be NULL. */
5938 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
5939 bfd *obfd ATTRIBUTE_UNUSED,
5940 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
5941 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
5943 /* PR 19938: FIXME: Need to add code for setting the sh_info
5944 and sh_link fields of Solaris specific section types. */
5947 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
5948 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
5950 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
5952 The following values should be set:
5955 -----------------------------------------------------------------------------
5956 SHT_SUNW_ancillary The section header index of 0
5957 [0x6fffffee] the associated string table.
5959 SHT_SUNW_capinfo The section header index of For a dynamic object, the
5960 [0x6ffffff0] the associated symbol table. section header index of
5962 SHT_SUNW_capchain table,
5965 SHT_SUNW_symsort The section header index of 0
5966 [0x6ffffff1] the associated symbol table.
5968 SHT_SUNW_tlssort The section header index of 0
5969 [0x6ffffff2] the associated symbol table.
5971 SHT_SUNW_LDYNSYM The section header index of One greater than the
5972 [0x6ffffff3] the associated string table. symbol table index of the
5973 This index is the same string last local symbol,
5974 table used by the SHT_DYNSYM STB_LOCAL. Since
5975 section. SHT_SUNW_LDYNSYM only
5976 contains local symbols,
5977 sh_info is equivalent to
5978 the number of symbols in
5981 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
5982 [0x6ffffff5] the section header index of to named strings, the
5983 the associated section header index of
5984 SHT_SUNW_capinfo table, the associated string
5985 otherwise 0. table, otherwise 0.
5987 SHT_SUNW_move The section header index of 0
5988 [0x6ffffffa] the associated symbol table.
5993 SHT_SUNW_syminfo The section header index of The section header index
5994 [0x6ffffffc] the associated symbol table. of the associated
5997 SHT_SUNW_verdef The section header index of The number of version
5998 [0x6ffffffd] the associated string table. definitions within the
6001 SHT_SUNW_verneed The section header index of The number of version
6002 [0x6ffffffe] the associated string table. dependencies within the
6005 SHT_SUNW_versym The section header index of 0
6006 [0x6fffffff] the associated symbol table. */
6009 #undef elf_backend_copy_special_section_fields
6010 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6012 #include "elf32-target.h"
6014 /* Intel MCU support. */
6017 elf32_iamcu_elf_object_p (bfd *abfd)
6019 /* Set the right machine number for an IAMCU elf32 file. */
6020 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6024 #undef TARGET_LITTLE_SYM
6025 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6026 #undef TARGET_LITTLE_NAME
6027 #define TARGET_LITTLE_NAME "elf32-iamcu"
6029 #define ELF_ARCH bfd_arch_iamcu
6031 #undef ELF_MACHINE_CODE
6032 #define ELF_MACHINE_CODE EM_IAMCU
6037 #define elf32_bed elf32_iamcu_bed
6039 #undef elf_backend_object_p
6040 #define elf_backend_object_p elf32_iamcu_elf_object_p
6042 #undef elf_backend_static_tls_alignment
6044 #undef elf_backend_want_plt_sym
6045 #define elf_backend_want_plt_sym 0
6047 #undef elf_backend_strtab_flags
6048 #undef elf_backend_copy_special_section_fields
6050 #include "elf32-target.h"
6052 /* Restore defaults. */
6054 #define ELF_ARCH bfd_arch_i386
6055 #undef ELF_MACHINE_CODE
6056 #define ELF_MACHINE_CODE EM_386
6058 /* Native Client support. */
6060 #undef TARGET_LITTLE_SYM
6061 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6062 #undef TARGET_LITTLE_NAME
6063 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6065 #define elf32_bed elf32_i386_nacl_bed
6067 #undef ELF_MAXPAGESIZE
6068 #define ELF_MAXPAGESIZE 0x10000
6070 /* Restore defaults. */
6072 #undef elf_backend_want_plt_sym
6073 #define elf_backend_want_plt_sym 0
6074 #undef elf_backend_post_process_headers
6075 #undef elf_backend_static_tls_alignment
6077 /* NaCl uses substantially different PLT entries for the same effects. */
6079 #undef elf_backend_plt_alignment
6080 #define elf_backend_plt_alignment 5
6081 #define NACL_PLT_ENTRY_SIZE 64
6082 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6084 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6086 0xff, 0x35, /* pushl contents of address */
6087 0, 0, 0, 0, /* replaced with address of .got + 4. */
6088 0x8b, 0x0d, /* movl contents of address, %ecx */
6089 0, 0, 0, 0, /* replaced with address of .got + 8. */
6090 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6091 0xff, 0xe1 /* jmp *%ecx */
6094 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6096 0x8b, 0x0d, /* movl contents of address, %ecx */
6097 0, 0, 0, 0, /* replaced with GOT slot address. */
6098 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6099 0xff, 0xe1, /* jmp *%ecx */
6101 /* Pad to the next 32-byte boundary with nop instructions. */
6103 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6104 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6106 /* Lazy GOT entries point here (32-byte aligned). */
6107 0x68, /* pushl immediate */
6108 0, 0, 0, 0, /* replaced with reloc offset. */
6109 0xe9, /* jmp relative */
6110 0, 0, 0, 0, /* replaced with offset to .plt. */
6112 /* Pad to the next 32-byte boundary with nop instructions. */
6113 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6114 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6118 static const bfd_byte
6119 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6121 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6122 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6123 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6124 0xff, 0xe1, /* jmp *%ecx */
6126 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6127 so pad to that size with nop instructions. */
6128 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6131 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6133 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6134 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6135 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6136 0xff, 0xe1, /* jmp *%ecx */
6138 /* Pad to the next 32-byte boundary with nop instructions. */
6140 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6141 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6143 /* Lazy GOT entries point here (32-byte aligned). */
6144 0x68, /* pushl immediate */
6145 0, 0, 0, 0, /* replaced with offset into relocation table. */
6146 0xe9, /* jmp relative */
6147 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6149 /* Pad to the next 32-byte boundary with nop instructions. */
6150 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6151 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6155 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6157 #if (PLT_CIE_LENGTH != 20 \
6158 || PLT_FDE_LENGTH != 36 \
6159 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6160 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6161 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6163 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6164 0, 0, 0, 0, /* CIE ID */
6165 1, /* CIE version */
6166 'z', 'R', 0, /* Augmentation string */
6167 1, /* Code alignment factor */
6168 0x7c, /* Data alignment factor: -4 */
6169 8, /* Return address column */
6170 1, /* Augmentation size */
6171 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6172 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6173 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6174 DW_CFA_nop, DW_CFA_nop,
6176 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6177 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6178 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6179 0, 0, 0, 0, /* .plt size goes here */
6180 0, /* Augmentation size */
6181 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6182 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6183 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6184 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6185 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6186 13, /* Block length */
6187 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6188 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6189 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6190 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6191 DW_CFA_nop, DW_CFA_nop
6194 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6196 elf_i386_nacl_plt0_entry, /* plt0_entry */
6197 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6198 2, /* plt0_got1_offset */
6199 8, /* plt0_got2_offset */
6200 elf_i386_nacl_plt_entry, /* plt_entry */
6201 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6202 2, /* plt_got_offset */
6203 33, /* plt_reloc_offset */
6204 38, /* plt_plt_offset */
6205 32, /* plt_lazy_offset */
6206 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6207 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6208 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6209 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6212 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6214 &elf_i386_nacl_plt, /* plt */
6215 0x90, /* plt0_pad_byte: nop insn */
6220 elf32_i386_nacl_elf_object_p (bfd *abfd)
6222 /* Set the right machine number for a NaCl i386 ELF32 file. */
6223 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6227 #undef elf_backend_arch_data
6228 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6230 #undef elf_backend_object_p
6231 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6232 #undef elf_backend_modify_segment_map
6233 #define elf_backend_modify_segment_map nacl_modify_segment_map
6234 #undef elf_backend_modify_program_headers
6235 #define elf_backend_modify_program_headers nacl_modify_program_headers
6236 #undef elf_backend_final_write_processing
6237 #define elf_backend_final_write_processing nacl_final_write_processing
6239 #include "elf32-target.h"
6241 /* Restore defaults. */
6242 #undef elf_backend_object_p
6243 #undef elf_backend_modify_segment_map
6244 #undef elf_backend_modify_program_headers
6245 #undef elf_backend_final_write_processing
6247 /* VxWorks support. */
6249 #undef TARGET_LITTLE_SYM
6250 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6251 #undef TARGET_LITTLE_NAME
6252 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6254 #undef elf_backend_plt_alignment
6255 #define elf_backend_plt_alignment 4
6257 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6259 &elf_i386_plt, /* plt */
6260 0x90, /* plt0_pad_byte */
6264 #undef elf_backend_arch_data
6265 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6267 #undef elf_backend_relocs_compatible
6268 #undef elf_backend_add_symbol_hook
6269 #define elf_backend_add_symbol_hook \
6270 elf_vxworks_add_symbol_hook
6271 #undef elf_backend_link_output_symbol_hook
6272 #define elf_backend_link_output_symbol_hook \
6273 elf_vxworks_link_output_symbol_hook
6274 #undef elf_backend_emit_relocs
6275 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6276 #undef elf_backend_final_write_processing
6277 #define elf_backend_final_write_processing \
6278 elf_vxworks_final_write_processing
6279 #undef elf_backend_static_tls_alignment
6281 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6283 #undef elf_backend_want_plt_sym
6284 #define elf_backend_want_plt_sym 1
6287 #define elf32_bed elf32_i386_vxworks_bed
6289 #include "elf32-target.h"