1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2016 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
32 #include "opcode/i386.h"
34 /* 386 uses REL relocations instead of RELA. */
39 static reloc_howto_type elf_howto_table[]=
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
163 FALSE, /* pc_relative */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
171 FALSE), /* pcrel_offset */
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
178 FALSE, /* pc_relative */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
186 FALSE) /* pcrel_offset */
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
192 #ifdef DEBUG_GEN_RELOC
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
393 return &elf_howto_table[indx];
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
399 Elf_Internal_Rela *dst)
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
414 if (name[0] == '.' && name[1] == 'X')
417 return _bfd_elf_is_local_label_name (abfd, name);
420 /* Support for core dump NOTE sections. */
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
430 int pr_version = bfd_get_32 (abfd, note->descdata);
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
443 size = bfd_get_32 (abfd, note->descdata + 8);
447 switch (note->descsz)
452 case 144: /* Linux/i386 */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
477 int pr_version = bfd_get_32 (abfd, note->descdata);
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
489 switch (note->descsz)
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
518 /* Functions for the i386 ELF linker.
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
532 /* The name of the dynamic interpreter. This is put in the .interp
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
541 #define ELIMINATE_COPY_RELOCS 1
543 /* The size in bytes of an entry in the procedure linkage table. */
545 #define PLT_ENTRY_SIZE 16
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
551 static const bfd_byte elf_i386_plt0_entry[12] =
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
559 /* Subsequent entries in an absolute procedure linkage table look like
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
593 /* Entries in the GOT procedure linkage table look like this. */
595 static const bfd_byte elf_i386_got_plt_entry[8] =
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
602 /* Entries in the PIC GOT procedure linkage table look like this. */
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
611 /* .eh_frame covering the .plt section. */
613 static const bfd_byte elf_i386_eh_frame_plt[] =
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
650 struct elf_i386_plt_layout
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
712 /* Architecture-specific backend data for i386. */
714 struct elf_i386_backend_data
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
722 /* True if the target system is VxWorks. */
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
738 #define elf_backend_arch_data &elf_i386_arch_bed
740 /* Is a undefined weak symbol which is resolved to 0. Reference to an
741 undefined weak symbol is resolved to 0 when building executable if
743 1. Has non-GOT/non-PLT relocations in text section. Or
744 2. Has no GOT/PLT relocation.
746 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
747 ((EH)->elf.root.type == bfd_link_hash_undefweak \
748 && bfd_link_executable (INFO) \
749 && (elf_i386_hash_table (INFO)->interp == NULL \
751 || (EH)->has_non_got_reloc \
752 || !(INFO)->dynamic_undefined_weak))
754 /* i386 ELF linker hash entry. */
756 struct elf_i386_link_hash_entry
758 struct elf_link_hash_entry elf;
760 /* Track dynamic relocs copied for this symbol. */
761 struct elf_dyn_relocs *dyn_relocs;
763 #define GOT_UNKNOWN 0
767 #define GOT_TLS_IE_POS 5
768 #define GOT_TLS_IE_NEG 6
769 #define GOT_TLS_IE_BOTH 7
770 #define GOT_TLS_GDESC 8
771 #define GOT_TLS_GD_BOTH_P(type) \
772 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
773 #define GOT_TLS_GD_P(type) \
774 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
775 #define GOT_TLS_GDESC_P(type) \
776 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
777 #define GOT_TLS_GD_ANY_P(type) \
778 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
779 unsigned char tls_type;
781 /* Symbol is referenced by R_386_GOTOFF relocation. */
782 unsigned int gotoff_ref : 1;
784 /* Symbol has GOT or PLT relocations. */
785 unsigned int has_got_reloc : 1;
787 /* Symbol has non-GOT/non-PLT relocations in text sections. */
788 unsigned int has_non_got_reloc : 1;
790 /* 0: symbol isn't ___tls_get_addr.
791 1: symbol is ___tls_get_addr.
792 2: symbol is unknown. */
793 unsigned int tls_get_addr : 2;
795 /* Reference count of C/C++ function pointer relocations in read-write
796 section which can be resolved at run-time. */
797 bfd_signed_vma func_pointer_refcount;
799 /* Information about the GOT PLT entry. Filled when there are both
800 GOT and PLT relocations against the same function. */
801 union gotplt_union plt_got;
803 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
804 starting at the end of the jump table. */
808 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
810 struct elf_i386_obj_tdata
812 struct elf_obj_tdata root;
814 /* tls_type for each local got entry. */
815 char *local_got_tls_type;
817 /* GOTPLT entries for TLS descriptors. */
818 bfd_vma *local_tlsdesc_gotent;
821 #define elf_i386_tdata(abfd) \
822 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
824 #define elf_i386_local_got_tls_type(abfd) \
825 (elf_i386_tdata (abfd)->local_got_tls_type)
827 #define elf_i386_local_tlsdesc_gotent(abfd) \
828 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
830 #define is_i386_elf(bfd) \
831 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
832 && elf_tdata (bfd) != NULL \
833 && elf_object_id (bfd) == I386_ELF_DATA)
836 elf_i386_mkobject (bfd *abfd)
838 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
842 /* i386 ELF linker hash table. */
844 struct elf_i386_link_hash_table
846 struct elf_link_hash_table elf;
848 /* Short-cuts to get to dynamic linker sections. */
852 asection *plt_eh_frame;
857 bfd_signed_vma refcount;
861 /* The amount of space used by the reserved portion of the sgotplt
862 section, plus whatever space is used by the jump slots. */
863 bfd_vma sgotplt_jump_table_size;
865 /* Small local sym cache. */
866 struct sym_cache sym_cache;
868 /* _TLS_MODULE_BASE_ symbol. */
869 struct bfd_link_hash_entry *tls_module_base;
871 /* Used by local STT_GNU_IFUNC symbols. */
872 htab_t loc_hash_table;
873 void * loc_hash_memory;
875 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
878 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
879 bfd_vma next_tls_desc_index;
881 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
882 bfd_vma next_jump_slot_index;
884 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
885 bfd_vma next_irelative_index;
887 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
888 to read-only sections. */
889 bfd_boolean readonly_dynrelocs_against_ifunc;
892 /* Get the i386 ELF linker hash table from a link_info structure. */
894 #define elf_i386_hash_table(p) \
895 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
896 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
898 #define elf_i386_compute_jump_table_size(htab) \
899 ((htab)->elf.srelplt->reloc_count * 4)
901 /* Create an entry in an i386 ELF linker hash table. */
903 static struct bfd_hash_entry *
904 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
905 struct bfd_hash_table *table,
908 /* Allocate the structure if it has not already been allocated by a
912 entry = (struct bfd_hash_entry *)
913 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
918 /* Call the allocation method of the superclass. */
919 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
922 struct elf_i386_link_hash_entry *eh;
924 eh = (struct elf_i386_link_hash_entry *) entry;
925 eh->dyn_relocs = NULL;
926 eh->tls_type = GOT_UNKNOWN;
928 eh->has_got_reloc = 0;
929 eh->has_non_got_reloc = 0;
930 eh->tls_get_addr = 2;
931 eh->func_pointer_refcount = 0;
932 eh->plt_got.offset = (bfd_vma) -1;
933 eh->tlsdesc_got = (bfd_vma) -1;
939 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
940 for local symbol so that we can handle local STT_GNU_IFUNC symbols
941 as global symbol. We reuse indx and dynstr_index for local symbol
942 hash since they aren't used by global symbols in this backend. */
945 elf_i386_local_htab_hash (const void *ptr)
947 struct elf_link_hash_entry *h
948 = (struct elf_link_hash_entry *) ptr;
949 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
952 /* Compare local hash entries. */
955 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
957 struct elf_link_hash_entry *h1
958 = (struct elf_link_hash_entry *) ptr1;
959 struct elf_link_hash_entry *h2
960 = (struct elf_link_hash_entry *) ptr2;
962 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
965 /* Find and/or create a hash entry for local symbol. */
967 static struct elf_link_hash_entry *
968 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
969 bfd *abfd, const Elf_Internal_Rela *rel,
972 struct elf_i386_link_hash_entry e, *ret;
973 asection *sec = abfd->sections;
974 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
975 ELF32_R_SYM (rel->r_info));
978 e.elf.indx = sec->id;
979 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
980 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
981 create ? INSERT : NO_INSERT);
988 ret = (struct elf_i386_link_hash_entry *) *slot;
992 ret = (struct elf_i386_link_hash_entry *)
993 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
994 sizeof (struct elf_i386_link_hash_entry));
997 memset (ret, 0, sizeof (*ret));
998 ret->elf.indx = sec->id;
999 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1000 ret->elf.dynindx = -1;
1001 ret->func_pointer_refcount = 0;
1002 ret->plt_got.offset = (bfd_vma) -1;
1008 /* Destroy an i386 ELF linker hash table. */
1011 elf_i386_link_hash_table_free (bfd *obfd)
1013 struct elf_i386_link_hash_table *htab
1014 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1016 if (htab->loc_hash_table)
1017 htab_delete (htab->loc_hash_table);
1018 if (htab->loc_hash_memory)
1019 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1020 _bfd_elf_link_hash_table_free (obfd);
1023 /* Create an i386 ELF linker hash table. */
1025 static struct bfd_link_hash_table *
1026 elf_i386_link_hash_table_create (bfd *abfd)
1028 struct elf_i386_link_hash_table *ret;
1029 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1031 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1035 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1036 elf_i386_link_hash_newfunc,
1037 sizeof (struct elf_i386_link_hash_entry),
1044 ret->loc_hash_table = htab_try_create (1024,
1045 elf_i386_local_htab_hash,
1046 elf_i386_local_htab_eq,
1048 ret->loc_hash_memory = objalloc_create ();
1049 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1051 elf_i386_link_hash_table_free (abfd);
1054 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1056 return &ret->elf.root;
1059 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1060 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1064 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1066 struct elf_i386_link_hash_table *htab;
1068 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1071 htab = elf_i386_hash_table (info);
1075 /* Set the contents of the .interp section to the interpreter. */
1076 if (bfd_link_executable (info) && !info->nointerp)
1078 asection *s = bfd_get_linker_section (dynobj, ".interp");
1081 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1082 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1086 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1090 if (bfd_link_executable (info))
1092 /* Always allow copy relocs for building executables. */
1093 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1096 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1097 s = bfd_make_section_anyway_with_flags (dynobj,
1099 (bed->dynamic_sec_flags
1102 || ! bfd_set_section_alignment (dynobj, s,
1103 bed->s->log_file_align))
1109 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1110 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1114 if (!info->no_ld_generated_unwind_info
1115 && htab->plt_eh_frame == NULL
1116 && htab->elf.splt != NULL)
1118 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1119 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1120 | SEC_LINKER_CREATED);
1122 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1123 if (htab->plt_eh_frame == NULL
1124 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1131 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1134 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1135 struct elf_link_hash_entry *dir,
1136 struct elf_link_hash_entry *ind)
1138 struct elf_i386_link_hash_entry *edir, *eind;
1140 edir = (struct elf_i386_link_hash_entry *) dir;
1141 eind = (struct elf_i386_link_hash_entry *) ind;
1143 if (eind->dyn_relocs != NULL)
1145 if (edir->dyn_relocs != NULL)
1147 struct elf_dyn_relocs **pp;
1148 struct elf_dyn_relocs *p;
1150 /* Add reloc counts against the indirect sym to the direct sym
1151 list. Merge any entries against the same section. */
1152 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1154 struct elf_dyn_relocs *q;
1156 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1157 if (q->sec == p->sec)
1159 q->pc_count += p->pc_count;
1160 q->count += p->count;
1167 *pp = edir->dyn_relocs;
1170 edir->dyn_relocs = eind->dyn_relocs;
1171 eind->dyn_relocs = NULL;
1174 if (ind->root.type == bfd_link_hash_indirect
1175 && dir->got.refcount <= 0)
1177 edir->tls_type = eind->tls_type;
1178 eind->tls_type = GOT_UNKNOWN;
1181 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1182 generate a R_386_COPY reloc. */
1183 edir->gotoff_ref |= eind->gotoff_ref;
1185 edir->has_got_reloc |= eind->has_got_reloc;
1186 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1188 if (ELIMINATE_COPY_RELOCS
1189 && ind->root.type != bfd_link_hash_indirect
1190 && dir->dynamic_adjusted)
1192 /* If called to transfer flags for a weakdef during processing
1193 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1194 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1195 dir->ref_dynamic |= ind->ref_dynamic;
1196 dir->ref_regular |= ind->ref_regular;
1197 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1198 dir->needs_plt |= ind->needs_plt;
1199 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1203 if (eind->func_pointer_refcount > 0)
1205 edir->func_pointer_refcount += eind->func_pointer_refcount;
1206 eind->func_pointer_refcount = 0;
1209 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1213 /* Return TRUE if the TLS access code sequence support transition
1217 elf_i386_check_tls_transition (asection *sec,
1219 Elf_Internal_Shdr *symtab_hdr,
1220 struct elf_link_hash_entry **sym_hashes,
1221 unsigned int r_type,
1222 const Elf_Internal_Rela *rel,
1223 const Elf_Internal_Rela *relend)
1225 unsigned int val, type, reg;
1226 unsigned long r_symndx;
1227 struct elf_link_hash_entry *h;
1230 bfd_boolean indirect_call, tls_get_addr;
1232 offset = rel->r_offset;
1237 if (offset < 2 || (rel + 1) >= relend)
1240 indirect_call = FALSE;
1241 call = contents + offset + 4;
1244 if (r_type == R_386_TLS_GD)
1246 /* Check transition from GD access model. Only
1247 leal foo@tlsgd(,%ebx,1), %eax
1248 call ___tls_get_addr@PLT
1250 leal foo@tlsgd(%ebx) %eax
1251 call ___tls_get_addr@PLT
1254 leal foo@tlsgd(%reg), %eax
1255 call *___tls_get_addr@GOT(%reg)
1256 which may be converted to
1257 addr32 call ___tls_get_addr
1258 can transit to different access model. */
1259 if ((offset + 10) > sec->size
1260 || (type != 0x8d && type != 0x04))
1265 /* leal foo@tlsgd(,%ebx,1), %eax
1266 call ___tls_get_addr@PLT */
1270 if (*(call - 7) != 0x8d
1278 leal foo@tlsgd(%ebx), %eax
1279 call ___tls_get_addr@PLT
1282 leal foo@tlsgd(%reg), %eax
1283 call *___tls_get_addr@GOT(%reg)
1284 which may be converted to
1285 addr32 call ___tls_get_addr
1287 %eax can't be used as the GOT base register since it
1288 is used to pass parameter to ___tls_get_addr. */
1290 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1293 indirect_call = call[0] == 0xff;
1294 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1295 && !(call[0] == 0x67 && call[1] == 0xe8)
1297 && (call[1] & 0xf8) == 0x90
1298 && (call[1] & 0x7) == reg))
1304 /* Check transition from LD access model. Only
1305 leal foo@tlsldm(%ebx), %eax
1306 call ___tls_get_addr@PLT
1308 leal foo@tlsldm(%reg), %eax
1309 call *___tls_get_addr@GOT(%reg)
1310 which may be converted to
1311 addr32 call ___tls_get_addr
1312 can transit to different access model. */
1313 if (type != 0x8d || (offset + 9) > sec->size)
1316 /* %eax can't be used as the GOT base register since it is
1317 used to pass parameter to ___tls_get_addr. */
1319 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1322 indirect_call = call[0] == 0xff;
1323 if (!(reg == 3 && call[0] == 0xe8)
1324 && !(call[0] == 0x67 && call[1] == 0xe8)
1326 && (call[1] & 0xf8) == 0x90
1327 && (call[1] & 0x7) == reg))
1331 r_symndx = ELF32_R_SYM (rel[1].r_info);
1332 if (r_symndx < symtab_hdr->sh_info)
1335 tls_get_addr = FALSE;
1336 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1337 if (h != NULL && h->root.root.string != NULL)
1339 struct elf_i386_link_hash_entry *eh
1340 = (struct elf_i386_link_hash_entry *) h;
1341 tls_get_addr = eh->tls_get_addr == 1;
1342 if (eh->tls_get_addr > 1)
1344 /* Use strncmp to check ___tls_get_addr since
1345 ___tls_get_addr may be versioned. */
1346 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1349 eh->tls_get_addr = 1;
1350 tls_get_addr = TRUE;
1353 eh->tls_get_addr = 0;
1359 else if (indirect_call)
1360 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1362 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1363 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1366 /* Check transition from IE access model:
1367 movl foo@indntpoff(%rip), %eax
1368 movl foo@indntpoff(%rip), %reg
1369 addl foo@indntpoff(%rip), %reg
1372 if (offset < 1 || (offset + 4) > sec->size)
1375 /* Check "movl foo@tpoff(%rip), %eax" first. */
1376 val = bfd_get_8 (abfd, contents + offset - 1);
1383 /* Check movl|addl foo@tpoff(%rip), %reg. */
1384 type = bfd_get_8 (abfd, contents + offset - 2);
1385 return ((type == 0x8b || type == 0x03)
1386 && (val & 0xc7) == 0x05);
1388 case R_386_TLS_GOTIE:
1389 case R_386_TLS_IE_32:
1390 /* Check transition from {IE_32,GOTIE} access model:
1391 subl foo@{tpoff,gontoff}(%reg1), %reg2
1392 movl foo@{tpoff,gontoff}(%reg1), %reg2
1393 addl foo@{tpoff,gontoff}(%reg1), %reg2
1396 if (offset < 2 || (offset + 4) > sec->size)
1399 val = bfd_get_8 (abfd, contents + offset - 1);
1400 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1403 type = bfd_get_8 (abfd, contents + offset - 2);
1404 return type == 0x8b || type == 0x2b || type == 0x03;
1406 case R_386_TLS_GOTDESC:
1407 /* Check transition from GDesc access model:
1408 leal x@tlsdesc(%ebx), %eax
1410 Make sure it's a leal adding ebx to a 32-bit offset
1411 into any register, although it's probably almost always
1414 if (offset < 2 || (offset + 4) > sec->size)
1417 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1420 val = bfd_get_8 (abfd, contents + offset - 1);
1421 return (val & 0xc7) == 0x83;
1423 case R_386_TLS_DESC_CALL:
1424 /* Check transition from GDesc access model:
1425 call *x@tlsdesc(%eax)
1427 if (offset + 2 <= sec->size)
1429 /* Make sure that it's a call *x@tlsdesc(%eax). */
1430 call = contents + offset;
1431 return call[0] == 0xff && call[1] == 0x10;
1441 /* Return TRUE if the TLS access transition is OK or no transition
1442 will be performed. Update R_TYPE if there is a transition. */
1445 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1446 asection *sec, bfd_byte *contents,
1447 Elf_Internal_Shdr *symtab_hdr,
1448 struct elf_link_hash_entry **sym_hashes,
1449 unsigned int *r_type, int tls_type,
1450 const Elf_Internal_Rela *rel,
1451 const Elf_Internal_Rela *relend,
1452 struct elf_link_hash_entry *h,
1453 unsigned long r_symndx,
1454 bfd_boolean from_relocate_section)
1456 unsigned int from_type = *r_type;
1457 unsigned int to_type = from_type;
1458 bfd_boolean check = TRUE;
1460 /* Skip TLS transition for functions. */
1462 && (h->type == STT_FUNC
1463 || h->type == STT_GNU_IFUNC))
1469 case R_386_TLS_GOTDESC:
1470 case R_386_TLS_DESC_CALL:
1471 case R_386_TLS_IE_32:
1473 case R_386_TLS_GOTIE:
1474 if (bfd_link_executable (info))
1477 to_type = R_386_TLS_LE_32;
1478 else if (from_type != R_386_TLS_IE
1479 && from_type != R_386_TLS_GOTIE)
1480 to_type = R_386_TLS_IE_32;
1483 /* When we are called from elf_i386_relocate_section, there may
1484 be additional transitions based on TLS_TYPE. */
1485 if (from_relocate_section)
1487 unsigned int new_to_type = to_type;
1489 if (bfd_link_executable (info)
1492 && (tls_type & GOT_TLS_IE))
1493 new_to_type = R_386_TLS_LE_32;
1495 if (to_type == R_386_TLS_GD
1496 || to_type == R_386_TLS_GOTDESC
1497 || to_type == R_386_TLS_DESC_CALL)
1499 if (tls_type == GOT_TLS_IE_POS)
1500 new_to_type = R_386_TLS_GOTIE;
1501 else if (tls_type & GOT_TLS_IE)
1502 new_to_type = R_386_TLS_IE_32;
1505 /* We checked the transition before when we were called from
1506 elf_i386_check_relocs. We only want to check the new
1507 transition which hasn't been checked before. */
1508 check = new_to_type != to_type && from_type == to_type;
1509 to_type = new_to_type;
1515 if (bfd_link_executable (info))
1516 to_type = R_386_TLS_LE_32;
1523 /* Return TRUE if there is no transition. */
1524 if (from_type == to_type)
1527 /* Check if the transition can be performed. */
1529 && ! elf_i386_check_tls_transition (sec, contents,
1530 symtab_hdr, sym_hashes,
1531 from_type, rel, relend))
1533 reloc_howto_type *from, *to;
1536 from = elf_i386_rtype_to_howto (abfd, from_type);
1537 to = elf_i386_rtype_to_howto (abfd, to_type);
1540 name = h->root.root.string;
1543 struct elf_i386_link_hash_table *htab;
1545 htab = elf_i386_hash_table (info);
1550 Elf_Internal_Sym *isym;
1552 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1554 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1558 (*_bfd_error_handler)
1559 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1560 "in section `%A' failed"),
1561 abfd, sec, from->name, to->name, name,
1562 (unsigned long) rel->r_offset);
1563 bfd_set_error (bfd_error_bad_value);
1571 /* With the local symbol, foo, we convert
1572 mov foo@GOT[(%reg1)], %reg2
1574 lea foo[@GOTOFF(%reg1)], %reg2
1576 call/jmp *foo@GOT[(%reg)]
1578 nop call foo/jmp foo nop
1579 When PIC is false, convert
1580 test %reg1, foo@GOT[(%reg2)]
1584 binop foo@GOT[(%reg1)], %reg2
1587 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1592 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1594 Elf_Internal_Rela *irel,
1595 struct elf_link_hash_entry *h,
1596 bfd_boolean *converted,
1597 struct bfd_link_info *link_info)
1599 struct elf_i386_link_hash_table *htab;
1600 unsigned int opcode;
1602 bfd_boolean baseless;
1603 Elf_Internal_Sym *isym;
1604 unsigned int addend;
1608 bfd_boolean to_reloc_32;
1609 unsigned int r_type;
1610 unsigned int r_symndx;
1611 bfd_vma roff = irel->r_offset;
1616 /* Addend for R_386_GOT32X relocations must be 0. */
1617 addend = bfd_get_32 (abfd, contents + roff);
1621 htab = elf_i386_hash_table (link_info);
1622 is_pic = bfd_link_pic (link_info);
1624 r_type = ELF32_R_TYPE (irel->r_info);
1625 r_symndx = ELF32_R_SYM (irel->r_info);
1627 modrm = bfd_get_8 (abfd, contents + roff - 1);
1628 baseless = (modrm & 0xc7) == 0x5;
1630 if (baseless && is_pic)
1632 /* For PIC, disallow R_386_GOT32X without a base register
1633 since we don't know what the GOT base is. */
1638 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1640 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1643 name = h->root.root.string;
1645 (*_bfd_error_handler)
1646 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
1651 opcode = bfd_get_8 (abfd, contents + roff - 2);
1653 /* Convert to R_386_32 if PIC is false or there is no base
1655 to_reloc_32 = !is_pic || baseless;
1657 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1661 if (opcode == 0x0ff)
1662 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1663 goto convert_branch;
1665 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1666 "test %reg1, foo@GOT(%reg2)" and
1667 "binop foo@GOT[(%reg1)], %reg2". */
1671 /* Undefined weak symbol is only bound locally in executable
1672 and its reference is resolved as 0. */
1673 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1674 elf_i386_hash_entry (h)))
1678 /* No direct branch to 0 for PIC. */
1682 goto convert_branch;
1686 /* We can convert load of address 0 to R_386_32. */
1694 /* We have "call/jmp *foo@GOT[(%reg)]". */
1695 if ((h->root.type == bfd_link_hash_defined
1696 || h->root.type == bfd_link_hash_defweak)
1697 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1699 /* The function is locally defined. */
1701 /* Convert R_386_GOT32X to R_386_PC32. */
1702 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1704 struct elf_i386_link_hash_entry *eh
1705 = (struct elf_i386_link_hash_entry *) h;
1707 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1710 /* To support TLS optimization, always use addr32 prefix
1711 for "call *___tls_get_addr@GOT(%reg)". */
1712 if (eh && eh->tls_get_addr == 1)
1715 nop_offset = irel->r_offset - 2;
1719 nop = link_info->call_nop_byte;
1720 if (link_info->call_nop_as_suffix)
1722 nop_offset = roff + 3;
1723 irel->r_offset -= 1;
1726 nop_offset = roff - 2;
1731 /* Convert to "jmp foo nop". */
1734 nop_offset = roff + 3;
1735 irel->r_offset -= 1;
1738 bfd_put_8 (abfd, nop, contents + nop_offset);
1739 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1740 /* When converting to PC-relative relocation, we
1741 need to adjust addend by -4. */
1742 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1743 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1750 /* We have "mov foo@GOT[(%re1g)], %reg2",
1751 "test %reg1, foo@GOT(%reg2)" and
1752 "binop foo@GOT[(%reg1)], %reg2".
1754 Avoid optimizing _DYNAMIC since ld.so may use its
1755 link-time address. */
1756 if (h == htab->elf.hdynamic)
1759 /* def_regular is set by an assignment in a linker script in
1760 bfd_elf_record_link_assignment. */
1762 || h->root.type == bfd_link_hash_defined
1763 || h->root.type == bfd_link_hash_defweak)
1764 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1771 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1772 "mov $foo, %reg2" with R_386_32. */
1774 modrm = 0xc0 | (modrm & 0x38) >> 3;
1775 bfd_put_8 (abfd, modrm, contents + roff - 1);
1780 /* Convert "mov foo@GOT(%reg1), %reg2" to
1781 "lea foo@GOTOFF(%reg1), %reg2". */
1782 r_type = R_386_GOTOFF;
1788 /* Only R_386_32 is supported. */
1794 /* Convert "test %reg1, foo@GOT(%reg2)" to
1795 "test $foo, %reg1". */
1796 modrm = 0xc0 | (modrm & 0x38) >> 3;
1801 /* Convert "binop foo@GOT(%reg1), %reg2" to
1802 "binop $foo, %reg2". */
1804 | (modrm & 0x38) >> 3
1808 bfd_put_8 (abfd, modrm, contents + roff - 1);
1812 bfd_put_8 (abfd, opcode, contents + roff - 2);
1813 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1822 /* Rename some of the generic section flags to better document how they
1824 #define need_convert_load sec_flg0
1825 #define check_relocs_failed sec_flg1
1827 /* Look through the relocs for a section during the first phase, and
1828 calculate needed space in the global offset table, procedure linkage
1829 table, and dynamic reloc sections. */
1832 elf_i386_check_relocs (bfd *abfd,
1833 struct bfd_link_info *info,
1835 const Elf_Internal_Rela *relocs)
1837 struct elf_i386_link_hash_table *htab;
1838 Elf_Internal_Shdr *symtab_hdr;
1839 struct elf_link_hash_entry **sym_hashes;
1840 const Elf_Internal_Rela *rel;
1841 const Elf_Internal_Rela *rel_end;
1844 bfd_boolean use_plt_got;
1846 if (bfd_link_relocatable (info))
1849 BFD_ASSERT (is_i386_elf (abfd));
1851 htab = elf_i386_hash_table (info);
1854 sec->check_relocs_failed = 1;
1858 /* Get the section contents. */
1859 if (elf_section_data (sec)->this_hdr.contents != NULL)
1860 contents = elf_section_data (sec)->this_hdr.contents;
1861 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1863 sec->check_relocs_failed = 1;
1867 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1868 && (get_elf_i386_backend_data (abfd)
1869 == &elf_i386_arch_bed));
1871 symtab_hdr = &elf_symtab_hdr (abfd);
1872 sym_hashes = elf_sym_hashes (abfd);
1876 rel_end = relocs + sec->reloc_count;
1877 for (rel = relocs; rel < rel_end; rel++)
1879 unsigned int r_type;
1880 unsigned long r_symndx;
1881 struct elf_link_hash_entry *h;
1882 struct elf_i386_link_hash_entry *eh;
1883 Elf_Internal_Sym *isym;
1885 bfd_boolean size_reloc;
1887 r_symndx = ELF32_R_SYM (rel->r_info);
1888 r_type = ELF32_R_TYPE (rel->r_info);
1890 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1892 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1898 if (r_symndx < symtab_hdr->sh_info)
1900 /* A local symbol. */
1901 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1906 /* Check relocation against local STT_GNU_IFUNC symbol. */
1907 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1909 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1913 /* Fake a STT_GNU_IFUNC symbol. */
1914 h->type = STT_GNU_IFUNC;
1917 h->forced_local = 1;
1918 h->root.type = bfd_link_hash_defined;
1926 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1927 while (h->root.type == bfd_link_hash_indirect
1928 || h->root.type == bfd_link_hash_warning)
1929 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1932 eh = (struct elf_i386_link_hash_entry *) h;
1947 if (htab->elf.dynobj == NULL)
1948 htab->elf.dynobj = abfd;
1949 /* Create the ifunc sections for static executables. */
1950 if (h->type == STT_GNU_IFUNC
1951 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
1957 /* It is referenced by a non-shared object. */
1959 h->root.non_ir_ref = 1;
1961 if (h->type == STT_GNU_IFUNC)
1962 elf_tdata (info->output_bfd)->has_gnu_symbols
1963 |= elf_gnu_symbol_ifunc;
1966 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1967 symtab_hdr, sym_hashes,
1968 &r_type, GOT_UNKNOWN,
1969 rel, rel_end, h, r_symndx, FALSE))
1975 htab->tls_ldm_got.refcount += 1;
1979 /* This symbol requires a procedure linkage table entry. We
1980 actually build the entry in adjust_dynamic_symbol,
1981 because this might be a case of linking PIC code which is
1982 never referenced by a dynamic object, in which case we
1983 don't need to generate a procedure linkage table entry
1986 /* If this is a local symbol, we resolve it directly without
1987 creating a procedure linkage table entry. */
1991 eh->has_got_reloc = 1;
1993 h->plt.refcount += 1;
2000 case R_386_TLS_IE_32:
2002 case R_386_TLS_GOTIE:
2003 if (!bfd_link_executable (info))
2004 info->flags |= DF_STATIC_TLS;
2010 case R_386_TLS_GOTDESC:
2011 case R_386_TLS_DESC_CALL:
2012 /* This symbol requires a global offset table entry. */
2014 int tls_type, old_tls_type;
2021 tls_type = GOT_NORMAL;
2023 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2024 case R_386_TLS_GOTDESC:
2025 case R_386_TLS_DESC_CALL:
2026 tls_type = GOT_TLS_GDESC; break;
2027 case R_386_TLS_IE_32:
2028 if (ELF32_R_TYPE (rel->r_info) == r_type)
2029 tls_type = GOT_TLS_IE_NEG;
2031 /* If this is a GD->IE transition, we may use either of
2032 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2033 tls_type = GOT_TLS_IE;
2036 case R_386_TLS_GOTIE:
2037 tls_type = GOT_TLS_IE_POS; break;
2042 h->got.refcount += 1;
2043 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2047 bfd_signed_vma *local_got_refcounts;
2049 /* This is a global offset table entry for a local symbol. */
2050 local_got_refcounts = elf_local_got_refcounts (abfd);
2051 if (local_got_refcounts == NULL)
2055 size = symtab_hdr->sh_info;
2056 size *= (sizeof (bfd_signed_vma)
2057 + sizeof (bfd_vma) + sizeof(char));
2058 local_got_refcounts = (bfd_signed_vma *)
2059 bfd_zalloc (abfd, size);
2060 if (local_got_refcounts == NULL)
2062 elf_local_got_refcounts (abfd) = local_got_refcounts;
2063 elf_i386_local_tlsdesc_gotent (abfd)
2064 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2065 elf_i386_local_got_tls_type (abfd)
2066 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2068 local_got_refcounts[r_symndx] += 1;
2069 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2072 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2073 tls_type |= old_tls_type;
2074 /* If a TLS symbol is accessed using IE at least once,
2075 there is no point to use dynamic model for it. */
2076 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2077 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2078 || (tls_type & GOT_TLS_IE) == 0))
2080 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2081 tls_type = old_tls_type;
2082 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2083 && GOT_TLS_GD_ANY_P (tls_type))
2084 tls_type |= old_tls_type;
2088 name = h->root.root.string;
2090 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2092 (*_bfd_error_handler)
2093 (_("%B: `%s' accessed both as normal and "
2094 "thread local symbol"),
2096 bfd_set_error (bfd_error_bad_value);
2101 if (old_tls_type != tls_type)
2104 elf_i386_hash_entry (h)->tls_type = tls_type;
2106 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2114 if (htab->elf.sgot == NULL)
2116 if (htab->elf.dynobj == NULL)
2117 htab->elf.dynobj = abfd;
2118 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
2121 if (r_type != R_386_TLS_IE)
2124 eh->has_got_reloc = 1;
2129 case R_386_TLS_LE_32:
2132 eh->has_got_reloc = 1;
2133 if (bfd_link_executable (info))
2135 info->flags |= DF_STATIC_TLS;
2140 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2141 eh->has_non_got_reloc = 1;
2143 /* STT_GNU_IFUNC symbol must go through PLT even if it is
2144 locally defined and undefined symbol may turn out to be
2145 a STT_GNU_IFUNC symbol later. */
2147 && (bfd_link_executable (info)
2148 || ((h->type == STT_GNU_IFUNC
2149 || h->root.type == bfd_link_hash_undefweak
2150 || h->root.type == bfd_link_hash_undefined)
2151 && SYMBOLIC_BIND (info, h))))
2153 /* If this reloc is in a read-only section, we might
2154 need a copy reloc. We can't check reliably at this
2155 stage whether the section is read-only, as input
2156 sections have not yet been mapped to output sections.
2157 Tentatively set the flag for now, and correct in
2158 adjust_dynamic_symbol. */
2161 /* We may need a .plt entry if the function this reloc
2162 refers to is in a shared lib. */
2163 h->plt.refcount += 1;
2164 if (r_type == R_386_PC32)
2166 /* Since something like ".long foo - ." may be used
2167 as pointer, make sure that PLT is used if foo is
2168 a function defined in a shared library. */
2169 if ((sec->flags & SEC_CODE) == 0)
2170 h->pointer_equality_needed = 1;
2174 h->pointer_equality_needed = 1;
2175 /* R_386_32 can be resolved at run-time. */
2176 if (r_type == R_386_32
2177 && (sec->flags & SEC_READONLY) == 0)
2178 eh->func_pointer_refcount += 1;
2184 /* If we are creating a shared library, and this is a reloc
2185 against a global symbol, or a non PC relative reloc
2186 against a local symbol, then we need to copy the reloc
2187 into the shared library. However, if we are linking with
2188 -Bsymbolic, we do not need to copy a reloc against a
2189 global symbol which is defined in an object we are
2190 including in the link (i.e., DEF_REGULAR is set). At
2191 this point we have not seen all the input files, so it is
2192 possible that DEF_REGULAR is not set now but will be set
2193 later (it is never cleared). In case of a weak definition,
2194 DEF_REGULAR may be cleared later by a strong definition in
2195 a shared library. We account for that possibility below by
2196 storing information in the relocs_copied field of the hash
2197 table entry. A similar situation occurs when creating
2198 shared libraries and symbol visibility changes render the
2201 If on the other hand, we are creating an executable, we
2202 may need to keep relocations for symbols satisfied by a
2203 dynamic library if we manage to avoid copy relocs for the
2205 if ((bfd_link_pic (info)
2206 && (sec->flags & SEC_ALLOC) != 0
2207 && (r_type != R_386_PC32
2209 && (! (bfd_link_pie (info)
2210 || SYMBOLIC_BIND (info, h))
2211 || h->root.type == bfd_link_hash_defweak
2212 || !h->def_regular))))
2213 || (ELIMINATE_COPY_RELOCS
2214 && !bfd_link_pic (info)
2215 && (sec->flags & SEC_ALLOC) != 0
2217 && (h->root.type == bfd_link_hash_defweak
2218 || !h->def_regular)))
2220 struct elf_dyn_relocs *p;
2221 struct elf_dyn_relocs **head;
2223 /* We must copy these reloc types into the output file.
2224 Create a reloc section in dynobj and make room for
2228 if (htab->elf.dynobj == NULL)
2229 htab->elf.dynobj = abfd;
2231 sreloc = _bfd_elf_make_dynamic_reloc_section
2232 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2238 /* If this is a global symbol, we count the number of
2239 relocations we need for this symbol. */
2242 head = &eh->dyn_relocs;
2246 /* Track dynamic relocs needed for local syms too.
2247 We really need local syms available to do this
2252 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2257 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2261 vpp = &elf_section_data (s)->local_dynrel;
2262 head = (struct elf_dyn_relocs **)vpp;
2266 if (p == NULL || p->sec != sec)
2268 bfd_size_type amt = sizeof *p;
2269 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2281 /* Count size relocation as PC-relative relocation. */
2282 if (r_type == R_386_PC32 || size_reloc)
2287 /* This relocation describes the C++ object vtable hierarchy.
2288 Reconstruct it for later use during GC. */
2289 case R_386_GNU_VTINHERIT:
2290 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2294 /* This relocation describes which C++ vtable entries are actually
2295 used. Record for later use during GC. */
2296 case R_386_GNU_VTENTRY:
2297 BFD_ASSERT (h != NULL);
2299 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2309 && h->plt.refcount > 0
2310 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2311 || h->got.refcount > 0)
2312 && htab->plt_got == NULL)
2314 /* Create the GOT procedure linkage table. */
2315 unsigned int plt_got_align;
2316 const struct elf_backend_data *bed;
2318 bed = get_elf_backend_data (info->output_bfd);
2319 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
2320 && (sizeof (elf_i386_got_plt_entry)
2321 == sizeof (elf_i386_pic_got_plt_entry)));
2324 if (htab->elf.dynobj == NULL)
2325 htab->elf.dynobj = abfd;
2327 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2329 (bed->dynamic_sec_flags
2334 if (htab->plt_got == NULL
2335 || !bfd_set_section_alignment (htab->elf.dynobj,
2341 if (r_type == R_386_GOT32X
2342 && (h == NULL || h->type != STT_GNU_IFUNC))
2343 sec->need_convert_load = 1;
2346 if (elf_section_data (sec)->this_hdr.contents != contents)
2348 if (!info->keep_memory)
2352 /* Cache the section contents for elf_link_input_bfd. */
2353 elf_section_data (sec)->this_hdr.contents = contents;
2360 if (elf_section_data (sec)->this_hdr.contents != contents)
2362 sec->check_relocs_failed = 1;
2366 /* Return the section that should be marked against GC for a given
2370 elf_i386_gc_mark_hook (asection *sec,
2371 struct bfd_link_info *info,
2372 Elf_Internal_Rela *rel,
2373 struct elf_link_hash_entry *h,
2374 Elf_Internal_Sym *sym)
2377 switch (ELF32_R_TYPE (rel->r_info))
2379 case R_386_GNU_VTINHERIT:
2380 case R_386_GNU_VTENTRY:
2384 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2387 /* Remove undefined weak symbol from the dynamic symbol table if it
2388 is resolved to 0. */
2391 elf_i386_fixup_symbol (struct bfd_link_info *info,
2392 struct elf_link_hash_entry *h)
2394 if (h->dynindx != -1
2395 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2396 elf_i386_hash_entry (h)->has_got_reloc,
2397 elf_i386_hash_entry (h)))
2400 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2406 /* Adjust a symbol defined by a dynamic object and referenced by a
2407 regular object. The current definition is in some section of the
2408 dynamic object, but we're not including those sections. We have to
2409 change the definition to something the rest of the link can
2413 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2414 struct elf_link_hash_entry *h)
2416 struct elf_i386_link_hash_table *htab;
2418 struct elf_i386_link_hash_entry *eh;
2419 struct elf_dyn_relocs *p;
2421 /* STT_GNU_IFUNC symbol must go through PLT. */
2422 if (h->type == STT_GNU_IFUNC)
2424 /* All local STT_GNU_IFUNC references must be treate as local
2425 calls via local PLT. */
2427 && SYMBOL_CALLS_LOCAL (info, h))
2429 bfd_size_type pc_count = 0, count = 0;
2430 struct elf_dyn_relocs **pp;
2432 eh = (struct elf_i386_link_hash_entry *) h;
2433 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2435 pc_count += p->pc_count;
2436 p->count -= p->pc_count;
2445 if (pc_count || count)
2449 if (h->plt.refcount <= 0)
2450 h->plt.refcount = 1;
2452 h->plt.refcount += 1;
2456 if (h->plt.refcount <= 0)
2458 h->plt.offset = (bfd_vma) -1;
2464 /* If this is a function, put it in the procedure linkage table. We
2465 will fill in the contents of the procedure linkage table later,
2466 when we know the address of the .got section. */
2467 if (h->type == STT_FUNC
2470 if (h->plt.refcount <= 0
2471 || SYMBOL_CALLS_LOCAL (info, h)
2472 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2473 && h->root.type == bfd_link_hash_undefweak))
2475 /* This case can occur if we saw a PLT32 reloc in an input
2476 file, but the symbol was never referred to by a dynamic
2477 object, or if all references were garbage collected. In
2478 such a case, we don't actually need to build a procedure
2479 linkage table, and we can just do a PC32 reloc instead. */
2480 h->plt.offset = (bfd_vma) -1;
2487 /* It's possible that we incorrectly decided a .plt reloc was
2488 needed for an R_386_PC32 reloc to a non-function sym in
2489 check_relocs. We can't decide accurately between function and
2490 non-function syms in check-relocs; Objects loaded later in
2491 the link may change h->type. So fix it now. */
2492 h->plt.offset = (bfd_vma) -1;
2494 /* If this is a weak symbol, and there is a real definition, the
2495 processor independent code will have arranged for us to see the
2496 real definition first, and we can just use the same value. */
2497 if (h->u.weakdef != NULL)
2499 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2500 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2501 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2502 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2503 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2504 h->non_got_ref = h->u.weakdef->non_got_ref;
2508 /* This is a reference to a symbol defined by a dynamic object which
2509 is not a function. */
2511 /* If we are creating a shared library, we must presume that the
2512 only references to the symbol are via the global offset table.
2513 For such cases we need not do anything here; the relocations will
2514 be handled correctly by relocate_section. */
2515 if (!bfd_link_executable (info))
2518 /* If there are no references to this symbol that do not use the
2519 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2521 eh = (struct elf_i386_link_hash_entry *) h;
2522 if (!h->non_got_ref && !eh->gotoff_ref)
2525 /* If -z nocopyreloc was given, we won't generate them either. */
2526 if (info->nocopyreloc)
2532 htab = elf_i386_hash_table (info);
2536 /* If there aren't any dynamic relocs in read-only sections nor
2537 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2538 avoid the copy reloc. This doesn't work on VxWorks, where we can
2539 not have dynamic relocations (other than copy and jump slot
2540 relocations) in an executable. */
2541 if (ELIMINATE_COPY_RELOCS
2543 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2545 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2547 s = p->sec->output_section;
2548 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2559 /* We must allocate the symbol in our .dynbss section, which will
2560 become part of the .bss section of the executable. There will be
2561 an entry for this symbol in the .dynsym section. The dynamic
2562 object will contain position independent code, so all references
2563 from the dynamic object to this symbol will go through the global
2564 offset table. The dynamic linker will use the .dynsym entry to
2565 determine the address it must put in the global offset table, so
2566 both the dynamic object and the regular object will refer to the
2567 same memory location for the variable. */
2569 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2570 copy the initial value out of the dynamic object and into the
2571 runtime process image. */
2572 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2574 htab->srelbss->size += sizeof (Elf32_External_Rel);
2580 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2583 /* Allocate space in .plt, .got and associated reloc sections for
2587 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2589 struct bfd_link_info *info;
2590 struct elf_i386_link_hash_table *htab;
2591 struct elf_i386_link_hash_entry *eh;
2592 struct elf_dyn_relocs *p;
2593 unsigned plt_entry_size;
2594 bfd_boolean resolved_to_zero;
2596 if (h->root.type == bfd_link_hash_indirect)
2599 eh = (struct elf_i386_link_hash_entry *) h;
2601 info = (struct bfd_link_info *) inf;
2602 htab = elf_i386_hash_table (info);
2606 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2608 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2612 /* Clear the reference count of function pointer relocations if
2613 symbol isn't a normal function. */
2614 if (h->type != STT_FUNC)
2615 eh->func_pointer_refcount = 0;
2617 /* We can't use the GOT PLT if pointer equality is needed since
2618 finish_dynamic_symbol won't clear symbol value and the dynamic
2619 linker won't update the GOT slot. We will get into an infinite
2620 loop at run-time. */
2621 if (htab->plt_got != NULL
2622 && h->type != STT_GNU_IFUNC
2623 && !h->pointer_equality_needed
2624 && h->plt.refcount > 0
2625 && h->got.refcount > 0)
2627 /* Don't use the regular PLT if there are both GOT and GOTPLT
2629 h->plt.offset = (bfd_vma) -1;
2631 /* Use the GOT PLT. */
2632 eh->plt_got.refcount = 1;
2635 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2636 here if it is defined and referenced in a non-shared object. */
2637 if (h->type == STT_GNU_IFUNC
2639 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2640 &htab->readonly_dynrelocs_against_ifunc,
2643 /* Don't create the PLT entry if there are only function pointer
2644 relocations which can be resolved at run-time. */
2645 else if (htab->elf.dynamic_sections_created
2646 && (h->plt.refcount > eh->func_pointer_refcount
2647 || eh->plt_got.refcount > 0))
2649 bfd_boolean use_plt_got;
2651 /* Clear the reference count of function pointer relocations
2653 eh->func_pointer_refcount = 0;
2655 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2657 /* Don't use the regular PLT for DF_BIND_NOW. */
2658 h->plt.offset = (bfd_vma) -1;
2660 /* Use the GOT PLT. */
2661 h->got.refcount = 1;
2662 eh->plt_got.refcount = 1;
2665 use_plt_got = eh->plt_got.refcount > 0;
2667 /* Make sure this symbol is output as a dynamic symbol.
2668 Undefined weak syms won't yet be marked as dynamic. */
2669 if (h->dynindx == -1
2671 && !resolved_to_zero)
2673 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2677 if (bfd_link_pic (info)
2678 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2680 asection *s = htab->elf.splt;
2681 asection *got_s = htab->plt_got;
2683 /* If this is the first .plt entry, make room for the special
2684 first entry. The .plt section is used by prelink to undo
2685 prelinking for dynamic relocations. */
2687 s->size = plt_entry_size;
2690 eh->plt_got.offset = got_s->size;
2692 h->plt.offset = s->size;
2694 /* If this symbol is not defined in a regular file, and we are
2695 not generating a shared library, then set the symbol to this
2696 location in the .plt. This is required to make function
2697 pointers compare as equal between the normal executable and
2698 the shared library. */
2699 if (! bfd_link_pic (info)
2704 /* We need to make a call to the entry of the GOT PLT
2705 instead of regular PLT entry. */
2706 h->root.u.def.section = got_s;
2707 h->root.u.def.value = eh->plt_got.offset;
2711 h->root.u.def.section = s;
2712 h->root.u.def.value = h->plt.offset;
2716 /* Make room for this entry. */
2718 got_s->size += sizeof (elf_i386_got_plt_entry);
2721 s->size += plt_entry_size;
2723 /* We also need to make an entry in the .got.plt section,
2724 which will be placed in the .got section by the linker
2726 htab->elf.sgotplt->size += 4;
2728 /* There should be no PLT relocation against resolved
2729 undefined weak symbol in executable. */
2730 if (!resolved_to_zero)
2732 /* We also need to make an entry in the .rel.plt
2734 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2735 htab->elf.srelplt->reloc_count++;
2739 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2740 && !bfd_link_pic (info))
2742 /* VxWorks has a second set of relocations for each PLT entry
2743 in executables. They go in a separate relocation section,
2744 which is processed by the kernel loader. */
2746 /* There are two relocations for the initial PLT entry: an
2747 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2748 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2750 if (h->plt.offset == plt_entry_size)
2751 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2753 /* There are two extra relocations for each subsequent PLT entry:
2754 an R_386_32 relocation for the GOT entry, and an R_386_32
2755 relocation for the PLT entry. */
2757 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2762 eh->plt_got.offset = (bfd_vma) -1;
2763 h->plt.offset = (bfd_vma) -1;
2769 eh->plt_got.offset = (bfd_vma) -1;
2770 h->plt.offset = (bfd_vma) -1;
2774 eh->tlsdesc_got = (bfd_vma) -1;
2776 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2777 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2778 if (h->got.refcount > 0
2779 && bfd_link_executable (info)
2781 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2782 h->got.offset = (bfd_vma) -1;
2783 else if (h->got.refcount > 0)
2787 int tls_type = elf_i386_hash_entry(h)->tls_type;
2789 /* Make sure this symbol is output as a dynamic symbol.
2790 Undefined weak syms won't yet be marked as dynamic. */
2791 if (h->dynindx == -1
2793 && !resolved_to_zero)
2795 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2800 if (GOT_TLS_GDESC_P (tls_type))
2802 eh->tlsdesc_got = htab->elf.sgotplt->size
2803 - elf_i386_compute_jump_table_size (htab);
2804 htab->elf.sgotplt->size += 8;
2805 h->got.offset = (bfd_vma) -2;
2807 if (! GOT_TLS_GDESC_P (tls_type)
2808 || GOT_TLS_GD_P (tls_type))
2810 h->got.offset = s->size;
2812 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2813 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2816 dyn = htab->elf.dynamic_sections_created;
2817 /* R_386_TLS_IE_32 needs one dynamic relocation,
2818 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2819 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2820 need two), R_386_TLS_GD needs one if local symbol and two if
2821 global. No dynamic relocation against resolved undefined weak
2822 symbol in executable. */
2823 if (tls_type == GOT_TLS_IE_BOTH)
2824 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2825 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2826 || (tls_type & GOT_TLS_IE))
2827 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2828 else if (GOT_TLS_GD_P (tls_type))
2829 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2830 else if (! GOT_TLS_GDESC_P (tls_type)
2831 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2832 && !resolved_to_zero)
2833 || h->root.type != bfd_link_hash_undefweak)
2834 && (bfd_link_pic (info)
2835 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2836 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2837 if (GOT_TLS_GDESC_P (tls_type))
2838 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2841 h->got.offset = (bfd_vma) -1;
2843 if (eh->dyn_relocs == NULL)
2846 /* In the shared -Bsymbolic case, discard space allocated for
2847 dynamic pc-relative relocs against symbols which turn out to be
2848 defined in regular objects. For the normal shared case, discard
2849 space for pc-relative relocs that have become local due to symbol
2850 visibility changes. */
2852 if (bfd_link_pic (info))
2854 /* The only reloc that uses pc_count is R_386_PC32, which will
2855 appear on a call or on something like ".long foo - .". We
2856 want calls to protected symbols to resolve directly to the
2857 function rather than going via the plt. If people want
2858 function pointer comparisons to work as expected then they
2859 should avoid writing assembly like ".long foo - .". */
2860 if (SYMBOL_CALLS_LOCAL (info, h))
2862 struct elf_dyn_relocs **pp;
2864 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2866 p->count -= p->pc_count;
2875 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2877 struct elf_dyn_relocs **pp;
2878 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2880 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2887 /* Also discard relocs on undefined weak syms with non-default
2888 visibility or in PIE. */
2889 if (eh->dyn_relocs != NULL
2890 && h->root.type == bfd_link_hash_undefweak)
2892 /* Undefined weak symbol is never bound locally in shared
2894 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2895 || resolved_to_zero)
2899 /* Keep dynamic non-GOT/non-PLT relocation so that we
2900 can branch to 0 without PLT. */
2901 struct elf_dyn_relocs **pp;
2903 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2904 if (p->pc_count == 0)
2908 /* Remove non-R_386_PC32 relocation. */
2909 p->count = p->pc_count;
2913 if (eh->dyn_relocs != NULL)
2915 /* Make sure undefined weak symbols are output
2916 as dynamic symbols in PIEs for dynamic non-GOT
2917 non-PLT reloations. */
2918 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2923 eh->dyn_relocs = NULL;
2925 else if (h->dynindx == -1
2926 && !h->forced_local)
2928 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2933 else if (ELIMINATE_COPY_RELOCS)
2935 /* For the non-shared case, discard space for relocs against
2936 symbols which turn out to need copy relocs or are not
2937 dynamic. Keep dynamic relocations for run-time function
2938 pointer initialization. */
2940 if ((!h->non_got_ref
2941 || eh->func_pointer_refcount > 0
2942 || (h->root.type == bfd_link_hash_undefweak
2943 && !resolved_to_zero))
2946 || (htab->elf.dynamic_sections_created
2947 && (h->root.type == bfd_link_hash_undefweak
2948 || h->root.type == bfd_link_hash_undefined))))
2950 /* Make sure this symbol is output as a dynamic symbol.
2951 Undefined weak syms won't yet be marked as dynamic. */
2952 if (h->dynindx == -1
2954 && !resolved_to_zero)
2956 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2960 /* If that succeeded, we know we'll be keeping all the
2962 if (h->dynindx != -1)
2966 eh->dyn_relocs = NULL;
2967 eh->func_pointer_refcount = 0;
2972 /* Finally, allocate space. */
2973 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2977 sreloc = elf_section_data (p->sec)->sreloc;
2979 BFD_ASSERT (sreloc != NULL);
2980 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2986 /* Allocate space in .plt, .got and associated reloc sections for
2987 local dynamic relocs. */
2990 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2992 struct elf_link_hash_entry *h
2993 = (struct elf_link_hash_entry *) *slot;
2995 if (h->type != STT_GNU_IFUNC
2999 || h->root.type != bfd_link_hash_defined)
3002 return elf_i386_allocate_dynrelocs (h, inf);
3005 /* Find any dynamic relocs that apply to read-only sections. */
3008 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3010 struct elf_i386_link_hash_entry *eh;
3011 struct elf_dyn_relocs *p;
3013 /* Skip local IFUNC symbols. */
3014 if (h->forced_local && h->type == STT_GNU_IFUNC)
3017 eh = (struct elf_i386_link_hash_entry *) h;
3018 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3020 asection *s = p->sec->output_section;
3022 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3024 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3026 info->flags |= DF_TEXTREL;
3028 if ((info->warn_shared_textrel && bfd_link_pic (info))
3029 || info->error_textrel)
3030 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3031 p->sec->owner, h->root.root.string,
3034 /* Not an error, just cut short the traversal. */
3041 /* Convert load via the GOT slot to load immediate. */
3044 elf_i386_convert_load (bfd *abfd, asection *sec,
3045 struct bfd_link_info *link_info)
3047 struct elf_i386_link_hash_table *htab;
3048 Elf_Internal_Shdr *symtab_hdr;
3049 Elf_Internal_Rela *internal_relocs;
3050 Elf_Internal_Rela *irel, *irelend;
3052 bfd_boolean changed;
3053 bfd_signed_vma *local_got_refcounts;
3055 /* Don't even try to convert non-ELF outputs. */
3056 if (!is_elf_hash_table (link_info->hash))
3059 /* Nothing to do if there is no need or no output. */
3060 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3061 || sec->need_convert_load == 0
3062 || bfd_is_abs_section (sec->output_section))
3065 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3067 /* Load the relocations for this section. */
3068 internal_relocs = (_bfd_elf_link_read_relocs
3069 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3070 link_info->keep_memory));
3071 if (internal_relocs == NULL)
3075 htab = elf_i386_hash_table (link_info);
3076 local_got_refcounts = elf_local_got_refcounts (abfd);
3078 /* Get the section contents. */
3079 if (elf_section_data (sec)->this_hdr.contents != NULL)
3080 contents = elf_section_data (sec)->this_hdr.contents;
3083 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3087 irelend = internal_relocs + sec->reloc_count;
3088 for (irel = internal_relocs; irel < irelend; irel++)
3090 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3091 unsigned int r_symndx;
3092 struct elf_link_hash_entry *h;
3093 bfd_boolean converted;
3095 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3096 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3097 if (r_type != R_386_GOT32X)
3100 r_symndx = ELF32_R_SYM (irel->r_info);
3101 if (r_symndx < symtab_hdr->sh_info)
3102 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3103 (const Elf_Internal_Rela *) irel,
3107 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3108 while (h->root.type == bfd_link_hash_indirect
3109 || h->root.type == bfd_link_hash_warning)
3110 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3113 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3114 if (h != NULL && h->type == STT_GNU_IFUNC)
3118 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3119 irel, h, &converted, link_info))
3124 changed = converted;
3127 if (h->got.refcount > 0)
3128 h->got.refcount -= 1;
3132 if (local_got_refcounts != NULL
3133 && local_got_refcounts[r_symndx] > 0)
3134 local_got_refcounts[r_symndx] -= 1;
3139 if (contents != NULL
3140 && elf_section_data (sec)->this_hdr.contents != contents)
3142 if (!changed && !link_info->keep_memory)
3146 /* Cache the section contents for elf_link_input_bfd. */
3147 elf_section_data (sec)->this_hdr.contents = contents;
3151 if (elf_section_data (sec)->relocs != internal_relocs)
3154 free (internal_relocs);
3156 elf_section_data (sec)->relocs = internal_relocs;
3162 if (contents != NULL
3163 && elf_section_data (sec)->this_hdr.contents != contents)
3165 if (internal_relocs != NULL
3166 && elf_section_data (sec)->relocs != internal_relocs)
3167 free (internal_relocs);
3171 /* Set the sizes of the dynamic sections. */
3174 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3176 struct elf_i386_link_hash_table *htab;
3182 htab = elf_i386_hash_table (info);
3185 dynobj = htab->elf.dynobj;
3189 /* Set up .got offsets for local syms, and space for local dynamic
3191 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3193 bfd_signed_vma *local_got;
3194 bfd_signed_vma *end_local_got;
3195 char *local_tls_type;
3196 bfd_vma *local_tlsdesc_gotent;
3197 bfd_size_type locsymcount;
3198 Elf_Internal_Shdr *symtab_hdr;
3201 if (! is_i386_elf (ibfd))
3204 for (s = ibfd->sections; s != NULL; s = s->next)
3206 struct elf_dyn_relocs *p;
3208 if (!elf_i386_convert_load (ibfd, s, info))
3211 for (p = ((struct elf_dyn_relocs *)
3212 elf_section_data (s)->local_dynrel);
3216 if (!bfd_is_abs_section (p->sec)
3217 && bfd_is_abs_section (p->sec->output_section))
3219 /* Input section has been discarded, either because
3220 it is a copy of a linkonce section or due to
3221 linker script /DISCARD/, so we'll be discarding
3224 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3225 && strcmp (p->sec->output_section->name,
3228 /* Relocations in vxworks .tls_vars sections are
3229 handled specially by the loader. */
3231 else if (p->count != 0)
3233 srel = elf_section_data (p->sec)->sreloc;
3234 srel->size += p->count * sizeof (Elf32_External_Rel);
3235 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3236 && (info->flags & DF_TEXTREL) == 0)
3238 info->flags |= DF_TEXTREL;
3239 if ((info->warn_shared_textrel && bfd_link_pic (info))
3240 || info->error_textrel)
3241 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3242 p->sec->owner, p->sec);
3248 local_got = elf_local_got_refcounts (ibfd);
3252 symtab_hdr = &elf_symtab_hdr (ibfd);
3253 locsymcount = symtab_hdr->sh_info;
3254 end_local_got = local_got + locsymcount;
3255 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3256 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3258 srel = htab->elf.srelgot;
3259 for (; local_got < end_local_got;
3260 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3262 *local_tlsdesc_gotent = (bfd_vma) -1;
3265 if (GOT_TLS_GDESC_P (*local_tls_type))
3267 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3268 - elf_i386_compute_jump_table_size (htab);
3269 htab->elf.sgotplt->size += 8;
3270 *local_got = (bfd_vma) -2;
3272 if (! GOT_TLS_GDESC_P (*local_tls_type)
3273 || GOT_TLS_GD_P (*local_tls_type))
3275 *local_got = s->size;
3277 if (GOT_TLS_GD_P (*local_tls_type)
3278 || *local_tls_type == GOT_TLS_IE_BOTH)
3281 if (bfd_link_pic (info)
3282 || GOT_TLS_GD_ANY_P (*local_tls_type)
3283 || (*local_tls_type & GOT_TLS_IE))
3285 if (*local_tls_type == GOT_TLS_IE_BOTH)
3286 srel->size += 2 * sizeof (Elf32_External_Rel);
3287 else if (GOT_TLS_GD_P (*local_tls_type)
3288 || ! GOT_TLS_GDESC_P (*local_tls_type))
3289 srel->size += sizeof (Elf32_External_Rel);
3290 if (GOT_TLS_GDESC_P (*local_tls_type))
3291 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3295 *local_got = (bfd_vma) -1;
3299 if (htab->tls_ldm_got.refcount > 0)
3301 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3303 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3304 htab->elf.sgot->size += 8;
3305 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3308 htab->tls_ldm_got.offset = -1;
3310 /* Allocate global sym .plt and .got entries, and space for global
3311 sym dynamic relocs. */
3312 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3314 /* Allocate .plt and .got entries, and space for local symbols. */
3315 htab_traverse (htab->loc_hash_table,
3316 elf_i386_allocate_local_dynrelocs,
3319 /* For every jump slot reserved in the sgotplt, reloc_count is
3320 incremented. However, when we reserve space for TLS descriptors,
3321 it's not incremented, so in order to compute the space reserved
3322 for them, it suffices to multiply the reloc count by the jump
3325 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3326 so that R_386_IRELATIVE entries come last. */
3327 if (htab->elf.srelplt)
3329 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3330 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3331 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3333 else if (htab->elf.irelplt)
3334 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3337 if (htab->elf.sgotplt)
3339 /* Don't allocate .got.plt section if there are no GOT nor PLT
3340 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3341 if ((htab->elf.hgot == NULL
3342 || !htab->elf.hgot->ref_regular_nonweak)
3343 && (htab->elf.sgotplt->size
3344 == get_elf_backend_data (output_bfd)->got_header_size)
3345 && (htab->elf.splt == NULL
3346 || htab->elf.splt->size == 0)
3347 && (htab->elf.sgot == NULL
3348 || htab->elf.sgot->size == 0)
3349 && (htab->elf.iplt == NULL
3350 || htab->elf.iplt->size == 0)
3351 && (htab->elf.igotplt == NULL
3352 || htab->elf.igotplt->size == 0))
3353 htab->elf.sgotplt->size = 0;
3357 if (htab->plt_eh_frame != NULL
3358 && htab->elf.splt != NULL
3359 && htab->elf.splt->size != 0
3360 && !bfd_is_abs_section (htab->elf.splt->output_section)
3361 && _bfd_elf_eh_frame_present (info))
3362 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3364 /* We now have determined the sizes of the various dynamic sections.
3365 Allocate memory for them. */
3367 for (s = dynobj->sections; s != NULL; s = s->next)
3369 bfd_boolean strip_section = TRUE;
3371 if ((s->flags & SEC_LINKER_CREATED) == 0)
3374 if (s == htab->elf.splt
3375 || s == htab->elf.sgot)
3377 /* Strip this section if we don't need it; see the
3379 /* We'd like to strip these sections if they aren't needed, but if
3380 we've exported dynamic symbols from them we must leave them.
3381 It's too late to tell BFD to get rid of the symbols. */
3383 if (htab->elf.hplt != NULL)
3384 strip_section = FALSE;
3386 else if (s == htab->elf.sgotplt
3387 || s == htab->elf.iplt
3388 || s == htab->elf.igotplt
3389 || s == htab->plt_got
3390 || s == htab->plt_eh_frame
3391 || s == htab->sdynbss)
3393 /* Strip these too. */
3395 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3398 && s != htab->elf.srelplt
3399 && s != htab->srelplt2)
3402 /* We use the reloc_count field as a counter if we need
3403 to copy relocs into the output file. */
3408 /* It's not one of our sections, so don't allocate space. */
3414 /* If we don't need this section, strip it from the
3415 output file. This is mostly to handle .rel.bss and
3416 .rel.plt. We must create both sections in
3417 create_dynamic_sections, because they must be created
3418 before the linker maps input sections to output
3419 sections. The linker does that before
3420 adjust_dynamic_symbol is called, and it is that
3421 function which decides whether anything needs to go
3422 into these sections. */
3424 s->flags |= SEC_EXCLUDE;
3428 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3431 /* Allocate memory for the section contents. We use bfd_zalloc
3432 here in case unused entries are not reclaimed before the
3433 section's contents are written out. This should not happen,
3434 but this way if it does, we get a R_386_NONE reloc instead
3436 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3437 if (s->contents == NULL)
3441 if (htab->plt_eh_frame != NULL
3442 && htab->plt_eh_frame->contents != NULL)
3444 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3445 sizeof (elf_i386_eh_frame_plt));
3446 bfd_put_32 (dynobj, htab->elf.splt->size,
3447 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3450 if (htab->elf.dynamic_sections_created)
3452 /* Add some entries to the .dynamic section. We fill in the
3453 values later, in elf_i386_finish_dynamic_sections, but we
3454 must add the entries now so that we get the correct size for
3455 the .dynamic section. The DT_DEBUG entry is filled in by the
3456 dynamic linker and used by the debugger. */
3457 #define add_dynamic_entry(TAG, VAL) \
3458 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3460 if (bfd_link_executable (info))
3462 if (!add_dynamic_entry (DT_DEBUG, 0))
3466 if (htab->elf.splt->size != 0)
3468 /* DT_PLTGOT is used by prelink even if there is no PLT
3470 if (!add_dynamic_entry (DT_PLTGOT, 0))
3473 if (htab->elf.srelplt->size != 0)
3475 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3476 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3477 || !add_dynamic_entry (DT_JMPREL, 0))
3484 if (!add_dynamic_entry (DT_REL, 0)
3485 || !add_dynamic_entry (DT_RELSZ, 0)
3486 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3489 /* If any dynamic relocs apply to a read-only section,
3490 then we need a DT_TEXTREL entry. */
3491 if ((info->flags & DF_TEXTREL) == 0)
3492 elf_link_hash_traverse (&htab->elf,
3493 elf_i386_readonly_dynrelocs, info);
3495 if ((info->flags & DF_TEXTREL) != 0)
3497 if (htab->readonly_dynrelocs_against_ifunc)
3499 info->callbacks->einfo
3500 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3501 bfd_set_error (bfd_error_bad_value);
3505 if (!add_dynamic_entry (DT_TEXTREL, 0))
3509 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3510 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3513 #undef add_dynamic_entry
3519 elf_i386_always_size_sections (bfd *output_bfd,
3520 struct bfd_link_info *info)
3522 asection *tls_sec = elf_hash_table (info)->tls_sec;
3526 struct elf_link_hash_entry *tlsbase;
3528 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3529 "_TLS_MODULE_BASE_",
3530 FALSE, FALSE, FALSE);
3532 if (tlsbase && tlsbase->type == STT_TLS)
3534 struct elf_i386_link_hash_table *htab;
3535 struct bfd_link_hash_entry *bh = NULL;
3536 const struct elf_backend_data *bed
3537 = get_elf_backend_data (output_bfd);
3539 htab = elf_i386_hash_table (info);
3543 if (!(_bfd_generic_link_add_one_symbol
3544 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3545 tls_sec, 0, NULL, FALSE,
3546 bed->collect, &bh)))
3549 htab->tls_module_base = bh;
3551 tlsbase = (struct elf_link_hash_entry *)bh;
3552 tlsbase->def_regular = 1;
3553 tlsbase->other = STV_HIDDEN;
3554 tlsbase->root.linker_def = 1;
3555 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3562 /* Set the correct type for an x86 ELF section. We do this by the
3563 section name, which is a hack, but ought to work. */
3566 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3567 Elf_Internal_Shdr *hdr,
3572 name = bfd_get_section_name (abfd, sec);
3574 /* This is an ugly, but unfortunately necessary hack that is
3575 needed when producing EFI binaries on x86. It tells
3576 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3577 containing ELF relocation info. We need this hack in order to
3578 be able to generate ELF binaries that can be translated into
3579 EFI applications (which are essentially COFF objects). Those
3580 files contain a COFF ".reloc" section inside an ELFNN object,
3581 which would normally cause BFD to segfault because it would
3582 attempt to interpret this section as containing relocation
3583 entries for section "oc". With this hack enabled, ".reloc"
3584 will be treated as a normal data section, which will avoid the
3585 segfault. However, you won't be able to create an ELFNN binary
3586 with a section named "oc" that needs relocations, but that's
3587 the kind of ugly side-effects you get when detecting section
3588 types based on their names... In practice, this limitation is
3589 unlikely to bite. */
3590 if (strcmp (name, ".reloc") == 0)
3591 hdr->sh_type = SHT_PROGBITS;
3596 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3597 executables. Rather than setting it to the beginning of the TLS
3598 section, we have to set it to the end. This function may be called
3599 multiple times, it is idempotent. */
3602 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3604 struct elf_i386_link_hash_table *htab;
3605 struct bfd_link_hash_entry *base;
3607 if (!bfd_link_executable (info))
3610 htab = elf_i386_hash_table (info);
3614 base = htab->tls_module_base;
3618 base->u.def.value = htab->elf.tls_size;
3621 /* Return the base VMA address which should be subtracted from real addresses
3622 when resolving @dtpoff relocation.
3623 This is PT_TLS segment p_vaddr. */
3626 elf_i386_dtpoff_base (struct bfd_link_info *info)
3628 /* If tls_sec is NULL, we should have signalled an error already. */
3629 if (elf_hash_table (info)->tls_sec == NULL)
3631 return elf_hash_table (info)->tls_sec->vma;
3634 /* Return the relocation value for @tpoff relocation
3635 if STT_TLS virtual address is ADDRESS. */
3638 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3640 struct elf_link_hash_table *htab = elf_hash_table (info);
3641 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3642 bfd_vma static_tls_size;
3644 /* If tls_sec is NULL, we should have signalled an error already. */
3645 if (htab->tls_sec == NULL)
3648 /* Consider special static TLS alignment requirements. */
3649 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3650 return static_tls_size + htab->tls_sec->vma - address;
3653 /* Relocate an i386 ELF section. */
3656 elf_i386_relocate_section (bfd *output_bfd,
3657 struct bfd_link_info *info,
3659 asection *input_section,
3661 Elf_Internal_Rela *relocs,
3662 Elf_Internal_Sym *local_syms,
3663 asection **local_sections)
3665 struct elf_i386_link_hash_table *htab;
3666 Elf_Internal_Shdr *symtab_hdr;
3667 struct elf_link_hash_entry **sym_hashes;
3668 bfd_vma *local_got_offsets;
3669 bfd_vma *local_tlsdesc_gotents;
3670 Elf_Internal_Rela *rel;
3671 Elf_Internal_Rela *wrel;
3672 Elf_Internal_Rela *relend;
3673 bfd_boolean is_vxworks_tls;
3674 unsigned plt_entry_size;
3676 BFD_ASSERT (is_i386_elf (input_bfd));
3678 /* Skip if check_relocs failed. */
3679 if (input_section->check_relocs_failed)
3682 htab = elf_i386_hash_table (info);
3685 symtab_hdr = &elf_symtab_hdr (input_bfd);
3686 sym_hashes = elf_sym_hashes (input_bfd);
3687 local_got_offsets = elf_local_got_offsets (input_bfd);
3688 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3689 /* We have to handle relocations in vxworks .tls_vars sections
3690 specially, because the dynamic loader is 'weird'. */
3691 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3692 && bfd_link_pic (info)
3693 && !strcmp (input_section->output_section->name,
3696 elf_i386_set_tls_module_base (info);
3698 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3700 rel = wrel = relocs;
3701 relend = relocs + input_section->reloc_count;
3702 for (; rel < relend; wrel++, rel++)
3704 unsigned int r_type;
3705 reloc_howto_type *howto;
3706 unsigned long r_symndx;
3707 struct elf_link_hash_entry *h;
3708 struct elf_i386_link_hash_entry *eh;
3709 Elf_Internal_Sym *sym;
3711 bfd_vma off, offplt, plt_offset;
3713 bfd_boolean unresolved_reloc;
3714 bfd_reloc_status_type r;
3718 asection *resolved_plt;
3719 bfd_boolean resolved_to_zero;
3721 r_type = ELF32_R_TYPE (rel->r_info);
3722 if (r_type == R_386_GNU_VTINHERIT
3723 || r_type == R_386_GNU_VTENTRY)
3730 if ((indx = r_type) >= R_386_standard
3731 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3732 >= R_386_ext - R_386_standard)
3733 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3734 >= R_386_ext2 - R_386_ext))
3736 (*_bfd_error_handler)
3737 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3738 input_bfd, input_section, r_type);
3739 bfd_set_error (bfd_error_bad_value);
3742 howto = elf_howto_table + indx;
3744 r_symndx = ELF32_R_SYM (rel->r_info);
3748 unresolved_reloc = FALSE;
3749 if (r_symndx < symtab_hdr->sh_info)
3751 sym = local_syms + r_symndx;
3752 sec = local_sections[r_symndx];
3753 relocation = (sec->output_section->vma
3754 + sec->output_offset
3756 st_size = sym->st_size;
3758 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3759 && ((sec->flags & SEC_MERGE) != 0
3760 || (bfd_link_relocatable (info)
3761 && sec->output_offset != 0)))
3764 bfd_byte *where = contents + rel->r_offset;
3766 switch (howto->size)
3769 addend = bfd_get_8 (input_bfd, where);
3770 if (howto->pc_relative)
3772 addend = (addend ^ 0x80) - 0x80;
3777 addend = bfd_get_16 (input_bfd, where);
3778 if (howto->pc_relative)
3780 addend = (addend ^ 0x8000) - 0x8000;
3785 addend = bfd_get_32 (input_bfd, where);
3786 if (howto->pc_relative)
3788 addend = (addend ^ 0x80000000) - 0x80000000;
3796 if (bfd_link_relocatable (info))
3797 addend += sec->output_offset;
3800 asection *msec = sec;
3801 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3803 addend -= relocation;
3804 addend += msec->output_section->vma + msec->output_offset;
3807 switch (howto->size)
3810 /* FIXME: overflow checks. */
3811 if (howto->pc_relative)
3813 bfd_put_8 (input_bfd, addend, where);
3816 if (howto->pc_relative)
3818 bfd_put_16 (input_bfd, addend, where);
3821 if (howto->pc_relative)
3823 bfd_put_32 (input_bfd, addend, where);
3827 else if (!bfd_link_relocatable (info)
3828 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3830 /* Relocate against local STT_GNU_IFUNC symbol. */
3831 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3836 /* Set STT_GNU_IFUNC symbol value. */
3837 h->root.u.def.value = sym->st_value;
3838 h->root.u.def.section = sec;
3843 bfd_boolean warned ATTRIBUTE_UNUSED;
3844 bfd_boolean ignored ATTRIBUTE_UNUSED;
3846 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3847 r_symndx, symtab_hdr, sym_hashes,
3849 unresolved_reloc, warned, ignored);
3853 if (sec != NULL && discarded_section (sec))
3855 _bfd_clear_contents (howto, input_bfd, input_section,
3856 contents + rel->r_offset);
3857 wrel->r_offset = rel->r_offset;
3861 /* For ld -r, remove relocations in debug sections against
3862 sections defined in discarded sections. Not done for
3863 eh_frame editing code expects to be present. */
3864 if (bfd_link_relocatable (info)
3865 && (input_section->flags & SEC_DEBUGGING))
3871 if (bfd_link_relocatable (info))
3878 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3879 it here if it is defined in a non-shared object. */
3881 && h->type == STT_GNU_IFUNC
3884 asection *plt, *gotplt, *base_got;
3888 if ((input_section->flags & SEC_ALLOC) == 0)
3890 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3891 sections because such sections are not SEC_ALLOC and
3892 thus ld.so will not process them. */
3893 if ((input_section->flags & SEC_DEBUGGING) != 0)
3897 else if (h->plt.offset == (bfd_vma) -1)
3900 /* STT_GNU_IFUNC symbol must go through PLT. */
3901 if (htab->elf.splt != NULL)
3903 plt = htab->elf.splt;
3904 gotplt = htab->elf.sgotplt;
3908 plt = htab->elf.iplt;
3909 gotplt = htab->elf.igotplt;
3912 relocation = (plt->output_section->vma
3913 + plt->output_offset + h->plt.offset);
3918 if (h->root.root.string)
3919 name = h->root.root.string;
3921 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3923 (*_bfd_error_handler)
3924 (_("%B: relocation %s against STT_GNU_IFUNC "
3925 "symbol `%s' isn't handled by %s"), input_bfd,
3926 elf_howto_table[r_type].name,
3927 name, __FUNCTION__);
3928 bfd_set_error (bfd_error_bad_value);
3932 /* Generate dynamic relcoation only when there is a
3933 non-GOT reference in a shared object. */
3934 if (bfd_link_pic (info) && h->non_got_ref)
3936 Elf_Internal_Rela outrel;
3940 /* Need a dynamic relocation to get the real function
3942 offset = _bfd_elf_section_offset (output_bfd,
3946 if (offset == (bfd_vma) -1
3947 || offset == (bfd_vma) -2)
3950 outrel.r_offset = (input_section->output_section->vma
3951 + input_section->output_offset
3954 if (h->dynindx == -1
3956 || bfd_link_executable (info))
3958 /* This symbol is resolved locally. */
3959 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3960 bfd_put_32 (output_bfd,
3961 (h->root.u.def.value
3962 + h->root.u.def.section->output_section->vma
3963 + h->root.u.def.section->output_offset),
3967 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3969 sreloc = htab->elf.irelifunc;
3970 elf_append_rel (output_bfd, sreloc, &outrel);
3972 /* If this reloc is against an external symbol, we
3973 do not want to fiddle with the addend. Otherwise,
3974 we need to include the symbol value so that it
3975 becomes an addend for the dynamic reloc. For an
3976 internal symbol, we have updated addend. */
3986 base_got = htab->elf.sgot;
3987 off = h->got.offset;
3989 if (base_got == NULL)
3992 if (off == (bfd_vma) -1)
3994 /* We can't use h->got.offset here to save state, or
3995 even just remember the offset, as finish_dynamic_symbol
3996 would use that as offset into .got. */
3998 if (htab->elf.splt != NULL)
4000 plt_index = h->plt.offset / plt_entry_size - 1;
4001 off = (plt_index + 3) * 4;
4002 base_got = htab->elf.sgotplt;
4006 plt_index = h->plt.offset / plt_entry_size;
4007 off = plt_index * 4;
4008 base_got = htab->elf.igotplt;
4011 if (h->dynindx == -1
4015 /* This references the local defitionion. We must
4016 initialize this entry in the global offset table.
4017 Since the offset must always be a multiple of 8,
4018 we use the least significant bit to record
4019 whether we have initialized it already.
4021 When doing a dynamic link, we create a .rela.got
4022 relocation entry to initialize the value. This
4023 is done in the finish_dynamic_symbol routine. */
4028 bfd_put_32 (output_bfd, relocation,
4029 base_got->contents + off);
4036 /* Adjust for static executables. */
4037 if (htab->elf.splt == NULL)
4038 relocation += gotplt->output_offset;
4042 relocation = (base_got->output_section->vma
4043 + base_got->output_offset + off
4044 - gotplt->output_section->vma
4045 - gotplt->output_offset);
4046 /* Adjust for static executables. */
4047 if (htab->elf.splt == NULL)
4048 relocation += gotplt->output_offset;
4054 relocation -= (gotplt->output_section->vma
4055 + gotplt->output_offset);
4060 eh = (struct elf_i386_link_hash_entry *) h;
4061 resolved_to_zero = (eh != NULL
4062 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4069 /* Avoid optimizing _DYNAMIC since ld.so may use its
4070 link-time address. */
4071 if (h == htab->elf.hdynamic)
4074 if (bfd_link_pic (info))
4076 /* It is OK to convert mov to lea and convert indirect
4077 branch to direct branch. It is OK to convert adc,
4078 add, and, cmp, or, sbb, sub, test, xor only when PIC
4080 unsigned int opcode, addend;
4081 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4084 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4085 if (opcode != 0x8b && opcode != 0xff)
4089 /* Resolve "mov GOT[(%reg)], %reg",
4090 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4091 and "binop foo@GOT[(%reg)], %reg". */
4093 || (h->plt.offset == (bfd_vma) -1
4094 && h->got.offset == (bfd_vma) -1)
4095 || htab->elf.sgotplt == NULL)
4098 offplt = (htab->elf.sgotplt->output_section->vma
4099 + htab->elf.sgotplt->output_offset);
4101 /* It is relative to .got.plt section. */
4102 if (h->got.offset != (bfd_vma) -1)
4103 /* Use GOT entry. Mask off the least significant bit in
4104 GOT offset which may be set by R_386_GOT32 processing
4106 relocation = (htab->elf.sgot->output_section->vma
4107 + htab->elf.sgot->output_offset
4108 + (h->got.offset & ~1) - offplt);
4110 /* Use GOTPLT entry. */
4111 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4113 if (!bfd_link_pic (info))
4115 /* If not PIC, add the .got.plt section address for
4116 baseless addressing. */
4118 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4119 if ((modrm & 0xc7) == 0x5)
4120 relocation += offplt;
4123 unresolved_reloc = FALSE;
4128 /* Relocation is to the entry for this symbol in the global
4130 if (htab->elf.sgot == NULL)
4137 off = h->got.offset;
4138 dyn = htab->elf.dynamic_sections_created;
4139 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4140 bfd_link_pic (info),
4142 || (bfd_link_pic (info)
4143 && SYMBOL_REFERENCES_LOCAL (info, h))
4144 || (ELF_ST_VISIBILITY (h->other)
4145 && h->root.type == bfd_link_hash_undefweak))
4147 /* This is actually a static link, or it is a
4148 -Bsymbolic link and the symbol is defined
4149 locally, or the symbol was forced to be local
4150 because of a version file. We must initialize
4151 this entry in the global offset table. Since the
4152 offset must always be a multiple of 4, we use the
4153 least significant bit to record whether we have
4154 initialized it already.
4156 When doing a dynamic link, we create a .rel.got
4157 relocation entry to initialize the value. This
4158 is done in the finish_dynamic_symbol routine. */
4163 bfd_put_32 (output_bfd, relocation,
4164 htab->elf.sgot->contents + off);
4169 unresolved_reloc = FALSE;
4173 if (local_got_offsets == NULL)
4176 off = local_got_offsets[r_symndx];
4178 /* The offset must always be a multiple of 4. We use
4179 the least significant bit to record whether we have
4180 already generated the necessary reloc. */
4185 bfd_put_32 (output_bfd, relocation,
4186 htab->elf.sgot->contents + off);
4188 if (bfd_link_pic (info))
4191 Elf_Internal_Rela outrel;
4193 s = htab->elf.srelgot;
4197 outrel.r_offset = (htab->elf.sgot->output_section->vma
4198 + htab->elf.sgot->output_offset
4200 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4201 elf_append_rel (output_bfd, s, &outrel);
4204 local_got_offsets[r_symndx] |= 1;
4208 if (off >= (bfd_vma) -2)
4211 relocation = (htab->elf.sgot->output_section->vma
4212 + htab->elf.sgot->output_offset + off);
4213 if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5)
4215 if (bfd_link_pic (info))
4217 /* For PIC, disallow R_386_GOT32 without a base
4218 register since we don't know what the GOT base
4223 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4226 name = h->root.root.string;
4228 (*_bfd_error_handler)
4229 (_("%B: direct GOT relocation R_386_GOT32 against `%s' without base register can not be used when making a shared object"),
4231 bfd_set_error (bfd_error_bad_value);
4237 /* Subtract the .got.plt section address only with a base
4239 relocation -= (htab->elf.sgotplt->output_section->vma
4240 + htab->elf.sgotplt->output_offset);
4246 /* Relocation is relative to the start of the global offset
4249 /* Check to make sure it isn't a protected function or data
4250 symbol for shared library since it may not be local when
4251 used as function address or with copy relocation. We also
4252 need to make sure that a symbol is referenced locally. */
4253 if (!bfd_link_executable (info) && h)
4255 if (!h->def_regular)
4259 switch (ELF_ST_VISIBILITY (h->other))
4262 v = _("hidden symbol");
4265 v = _("internal symbol");
4268 v = _("protected symbol");
4275 (*_bfd_error_handler)
4276 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4277 input_bfd, v, h->root.root.string);
4278 bfd_set_error (bfd_error_bad_value);
4281 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4282 && (h->type == STT_FUNC
4283 || h->type == STT_OBJECT)
4284 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4286 (*_bfd_error_handler)
4287 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4289 h->type == STT_FUNC ? "function" : "data",
4290 h->root.root.string);
4291 bfd_set_error (bfd_error_bad_value);
4296 /* Note that sgot is not involved in this
4297 calculation. We always want the start of .got.plt. If we
4298 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4299 permitted by the ABI, we might have to change this
4301 relocation -= htab->elf.sgotplt->output_section->vma
4302 + htab->elf.sgotplt->output_offset;
4306 /* Use global offset table as symbol value. */
4307 relocation = htab->elf.sgotplt->output_section->vma
4308 + htab->elf.sgotplt->output_offset;
4309 unresolved_reloc = FALSE;
4313 /* Relocation is to the entry for this symbol in the
4314 procedure linkage table. */
4316 /* Resolve a PLT32 reloc against a local symbol directly,
4317 without using the procedure linkage table. */
4321 if ((h->plt.offset == (bfd_vma) -1
4322 && eh->plt_got.offset == (bfd_vma) -1)
4323 || htab->elf.splt == NULL)
4325 /* We didn't make a PLT entry for this symbol. This
4326 happens when statically linking PIC code, or when
4327 using -Bsymbolic. */
4331 if (h->plt.offset != (bfd_vma) -1)
4333 resolved_plt = htab->elf.splt;
4334 plt_offset = h->plt.offset;
4338 resolved_plt = htab->plt_got;
4339 plt_offset = eh->plt_got.offset;
4342 relocation = (resolved_plt->output_section->vma
4343 + resolved_plt->output_offset
4345 unresolved_reloc = FALSE;
4349 /* Set to symbol size. */
4350 relocation = st_size;
4355 if ((input_section->flags & SEC_ALLOC) == 0
4359 /* Copy dynamic function pointer relocations. Don't generate
4360 dynamic relocations against resolved undefined weak symbols
4361 in PIE, except for R_386_PC32. */
4362 if ((bfd_link_pic (info)
4364 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4365 && (!resolved_to_zero
4366 || r_type == R_386_PC32))
4367 || h->root.type != bfd_link_hash_undefweak))
4368 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4369 || !SYMBOL_CALLS_LOCAL (info, h)))
4370 || (ELIMINATE_COPY_RELOCS
4371 && !bfd_link_pic (info)
4375 || eh->func_pointer_refcount > 0
4376 || (h->root.type == bfd_link_hash_undefweak
4377 && !resolved_to_zero))
4378 && ((h->def_dynamic && !h->def_regular)
4379 /* Undefined weak symbol is bound locally when
4381 || h->root.type == bfd_link_hash_undefweak)))
4383 Elf_Internal_Rela outrel;
4384 bfd_boolean skip, relocate;
4387 /* When generating a shared object, these relocations
4388 are copied into the output file to be resolved at run
4395 _bfd_elf_section_offset (output_bfd, info, input_section,
4397 if (outrel.r_offset == (bfd_vma) -1)
4399 else if (outrel.r_offset == (bfd_vma) -2)
4400 skip = TRUE, relocate = TRUE;
4401 outrel.r_offset += (input_section->output_section->vma
4402 + input_section->output_offset);
4405 memset (&outrel, 0, sizeof outrel);
4408 && (r_type == R_386_PC32
4409 || !(bfd_link_executable (info)
4410 || SYMBOLIC_BIND (info, h))
4411 || !h->def_regular))
4412 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4415 /* This symbol is local, or marked to become local. */
4417 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4420 sreloc = elf_section_data (input_section)->sreloc;
4422 if (sreloc == NULL || sreloc->contents == NULL)
4424 r = bfd_reloc_notsupported;
4425 goto check_relocation_error;
4428 elf_append_rel (output_bfd, sreloc, &outrel);
4430 /* If this reloc is against an external symbol, we do
4431 not want to fiddle with the addend. Otherwise, we
4432 need to include the symbol value so that it becomes
4433 an addend for the dynamic reloc. */
4440 if (!bfd_link_executable (info))
4442 Elf_Internal_Rela outrel;
4445 outrel.r_offset = rel->r_offset
4446 + input_section->output_section->vma
4447 + input_section->output_offset;
4448 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4449 sreloc = elf_section_data (input_section)->sreloc;
4452 elf_append_rel (output_bfd, sreloc, &outrel);
4457 case R_386_TLS_GOTDESC:
4458 case R_386_TLS_DESC_CALL:
4459 case R_386_TLS_IE_32:
4460 case R_386_TLS_GOTIE:
4461 tls_type = GOT_UNKNOWN;
4462 if (h == NULL && local_got_offsets)
4463 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4465 tls_type = elf_i386_hash_entry(h)->tls_type;
4466 if (tls_type == GOT_TLS_IE)
4467 tls_type = GOT_TLS_IE_NEG;
4469 if (! elf_i386_tls_transition (info, input_bfd,
4470 input_section, contents,
4471 symtab_hdr, sym_hashes,
4472 &r_type, tls_type, rel,
4473 relend, h, r_symndx, TRUE))
4476 if (r_type == R_386_TLS_LE_32)
4478 BFD_ASSERT (! unresolved_reloc);
4479 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4484 /* GD->LE transition. */
4485 type = *(contents + rel->r_offset - 2);
4489 leal foo@tlsgd(,%ebx,1), %eax
4490 call ___tls_get_addr@PLT
4493 subl $foo@tpoff, %eax
4494 (6 byte form of subl). */
4495 roff = rel->r_offset + 5;
4500 leal foo@tlsgd(%ebx), %eax
4501 call ___tls_get_addr@PLT
4504 leal foo@tlsgd(%reg), %eax
4505 call *___tls_get_addr@GOT(%reg)
4506 which may be converted to
4507 addr32 call ___tls_get_addr
4509 movl %gs:0, %eax; subl $foo@tpoff, %eax
4510 (6 byte form of subl). */
4511 roff = rel->r_offset + 6;
4513 memcpy (contents + roff - 8,
4514 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4515 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4517 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4522 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4524 /* GDesc -> LE transition.
4525 It's originally something like:
4526 leal x@tlsdesc(%ebx), %eax
4530 Registers other than %eax may be set up here. */
4535 roff = rel->r_offset;
4536 val = bfd_get_8 (input_bfd, contents + roff - 1);
4538 /* Now modify the instruction as appropriate. */
4539 /* aoliva FIXME: remove the above and xor the byte
4541 bfd_put_8 (output_bfd, val ^ 0x86,
4542 contents + roff - 1);
4543 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4547 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4549 /* GDesc -> LE transition.
4557 roff = rel->r_offset;
4558 bfd_put_8 (output_bfd, 0x66, contents + roff);
4559 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4562 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4566 /* IE->LE transition:
4567 Originally it can be one of:
4575 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4578 /* movl foo, %eax. */
4579 bfd_put_8 (output_bfd, 0xb8,
4580 contents + rel->r_offset - 1);
4586 type = bfd_get_8 (input_bfd,
4587 contents + rel->r_offset - 2);
4592 bfd_put_8 (output_bfd, 0xc7,
4593 contents + rel->r_offset - 2);
4594 bfd_put_8 (output_bfd,
4595 0xc0 | ((val >> 3) & 7),
4596 contents + rel->r_offset - 1);
4600 bfd_put_8 (output_bfd, 0x81,
4601 contents + rel->r_offset - 2);
4602 bfd_put_8 (output_bfd,
4603 0xc0 | ((val >> 3) & 7),
4604 contents + rel->r_offset - 1);
4611 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4612 contents + rel->r_offset);
4617 unsigned int val, type;
4619 /* {IE_32,GOTIE}->LE transition:
4620 Originally it can be one of:
4621 subl foo(%reg1), %reg2
4622 movl foo(%reg1), %reg2
4623 addl foo(%reg1), %reg2
4626 movl $foo, %reg2 (6 byte form)
4627 addl $foo, %reg2. */
4628 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4629 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4633 bfd_put_8 (output_bfd, 0xc7,
4634 contents + rel->r_offset - 2);
4635 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4636 contents + rel->r_offset - 1);
4638 else if (type == 0x2b)
4641 bfd_put_8 (output_bfd, 0x81,
4642 contents + rel->r_offset - 2);
4643 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4644 contents + rel->r_offset - 1);
4646 else if (type == 0x03)
4649 bfd_put_8 (output_bfd, 0x81,
4650 contents + rel->r_offset - 2);
4651 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4652 contents + rel->r_offset - 1);
4656 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4657 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4658 contents + rel->r_offset);
4660 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4661 contents + rel->r_offset);
4666 if (htab->elf.sgot == NULL)
4671 off = h->got.offset;
4672 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4676 if (local_got_offsets == NULL)
4679 off = local_got_offsets[r_symndx];
4680 offplt = local_tlsdesc_gotents[r_symndx];
4687 Elf_Internal_Rela outrel;
4691 if (htab->elf.srelgot == NULL)
4694 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4696 if (GOT_TLS_GDESC_P (tls_type))
4699 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4700 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4701 <= htab->elf.sgotplt->size);
4702 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4703 + htab->elf.sgotplt->output_offset
4705 + htab->sgotplt_jump_table_size);
4706 sreloc = htab->elf.srelplt;
4707 loc = sreloc->contents;
4708 loc += (htab->next_tls_desc_index++
4709 * sizeof (Elf32_External_Rel));
4710 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4711 <= sreloc->contents + sreloc->size);
4712 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4715 BFD_ASSERT (! unresolved_reloc);
4716 bfd_put_32 (output_bfd,
4717 relocation - elf_i386_dtpoff_base (info),
4718 htab->elf.sgotplt->contents + offplt
4719 + htab->sgotplt_jump_table_size + 4);
4723 bfd_put_32 (output_bfd, 0,
4724 htab->elf.sgotplt->contents + offplt
4725 + htab->sgotplt_jump_table_size + 4);
4729 sreloc = htab->elf.srelgot;
4731 outrel.r_offset = (htab->elf.sgot->output_section->vma
4732 + htab->elf.sgot->output_offset + off);
4734 if (GOT_TLS_GD_P (tls_type))
4735 dr_type = R_386_TLS_DTPMOD32;
4736 else if (GOT_TLS_GDESC_P (tls_type))
4738 else if (tls_type == GOT_TLS_IE_POS)
4739 dr_type = R_386_TLS_TPOFF;
4741 dr_type = R_386_TLS_TPOFF32;
4743 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4744 bfd_put_32 (output_bfd,
4745 relocation - elf_i386_dtpoff_base (info),
4746 htab->elf.sgot->contents + off);
4747 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4748 bfd_put_32 (output_bfd,
4749 elf_i386_dtpoff_base (info) - relocation,
4750 htab->elf.sgot->contents + off);
4751 else if (dr_type != R_386_TLS_DESC)
4752 bfd_put_32 (output_bfd, 0,
4753 htab->elf.sgot->contents + off);
4754 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4756 elf_append_rel (output_bfd, sreloc, &outrel);
4758 if (GOT_TLS_GD_P (tls_type))
4762 BFD_ASSERT (! unresolved_reloc);
4763 bfd_put_32 (output_bfd,
4764 relocation - elf_i386_dtpoff_base (info),
4765 htab->elf.sgot->contents + off + 4);
4769 bfd_put_32 (output_bfd, 0,
4770 htab->elf.sgot->contents + off + 4);
4771 outrel.r_info = ELF32_R_INFO (indx,
4772 R_386_TLS_DTPOFF32);
4773 outrel.r_offset += 4;
4774 elf_append_rel (output_bfd, sreloc, &outrel);
4777 else if (tls_type == GOT_TLS_IE_BOTH)
4779 bfd_put_32 (output_bfd,
4781 ? relocation - elf_i386_dtpoff_base (info)
4783 htab->elf.sgot->contents + off + 4);
4784 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4785 outrel.r_offset += 4;
4786 elf_append_rel (output_bfd, sreloc, &outrel);
4793 local_got_offsets[r_symndx] |= 1;
4796 if (off >= (bfd_vma) -2
4797 && ! GOT_TLS_GDESC_P (tls_type))
4799 if (r_type == R_386_TLS_GOTDESC
4800 || r_type == R_386_TLS_DESC_CALL)
4802 relocation = htab->sgotplt_jump_table_size + offplt;
4803 unresolved_reloc = FALSE;
4805 else if (r_type == ELF32_R_TYPE (rel->r_info))
4807 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4808 + htab->elf.sgotplt->output_offset;
4809 relocation = htab->elf.sgot->output_section->vma
4810 + htab->elf.sgot->output_offset + off - g_o_t;
4811 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4812 && tls_type == GOT_TLS_IE_BOTH)
4814 if (r_type == R_386_TLS_IE)
4815 relocation += g_o_t;
4816 unresolved_reloc = FALSE;
4818 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4820 unsigned int val, type;
4823 /* GD->IE transition. */
4824 type = *(contents + rel->r_offset - 2);
4825 val = *(contents + rel->r_offset - 1);
4829 leal foo@tlsgd(,%ebx,1), %eax
4830 call ___tls_get_addr@PLT
4833 subl $foo@gottpoff(%ebx), %eax. */
4835 roff = rel->r_offset - 3;
4840 leal foo@tlsgd(%ebx), %eax
4841 call ___tls_get_addr@PLT
4844 leal foo@tlsgd(%reg), %eax
4845 call *___tls_get_addr@GOT(%reg)
4846 which may be converted to
4847 addr32 call ___tls_get_addr
4850 subl $foo@gottpoff(%reg), %eax. */
4851 roff = rel->r_offset - 2;
4853 memcpy (contents + roff,
4854 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4855 contents[roff + 7] = 0x80 | (val & 7);
4856 /* If foo is used only with foo@gotntpoff(%reg) and
4857 foo@indntpoff, but not with foo@gottpoff(%reg), change
4858 subl $foo@gottpoff(%reg), %eax
4860 addl $foo@gotntpoff(%reg), %eax. */
4861 if (tls_type == GOT_TLS_IE_POS)
4862 contents[roff + 6] = 0x03;
4863 bfd_put_32 (output_bfd,
4864 htab->elf.sgot->output_section->vma
4865 + htab->elf.sgot->output_offset + off
4866 - htab->elf.sgotplt->output_section->vma
4867 - htab->elf.sgotplt->output_offset,
4868 contents + roff + 8);
4869 /* Skip R_386_PLT32 and R_386_GOT32X. */
4874 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4876 /* GDesc -> IE transition.
4877 It's originally something like:
4878 leal x@tlsdesc(%ebx), %eax
4881 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4883 movl x@gottpoff(%ebx), %eax # before negl %eax
4885 Registers other than %eax may be set up here. */
4889 /* First, make sure it's a leal adding ebx to a 32-bit
4890 offset into any register, although it's probably
4891 almost always going to be eax. */
4892 roff = rel->r_offset;
4894 /* Now modify the instruction as appropriate. */
4895 /* To turn a leal into a movl in the form we use it, it
4896 suffices to change the first byte from 0x8d to 0x8b.
4897 aoliva FIXME: should we decide to keep the leal, all
4898 we have to do is remove the statement below, and
4899 adjust the relaxation of R_386_TLS_DESC_CALL. */
4900 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4902 if (tls_type == GOT_TLS_IE_BOTH)
4905 bfd_put_32 (output_bfd,
4906 htab->elf.sgot->output_section->vma
4907 + htab->elf.sgot->output_offset + off
4908 - htab->elf.sgotplt->output_section->vma
4909 - htab->elf.sgotplt->output_offset,
4913 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4915 /* GDesc -> IE transition.
4923 depending on how we transformed the TLS_GOTDESC above.
4928 roff = rel->r_offset;
4930 /* Now modify the instruction as appropriate. */
4931 if (tls_type != GOT_TLS_IE_NEG)
4934 bfd_put_8 (output_bfd, 0x66, contents + roff);
4935 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4940 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4941 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4951 if (! elf_i386_tls_transition (info, input_bfd,
4952 input_section, contents,
4953 symtab_hdr, sym_hashes,
4954 &r_type, GOT_UNKNOWN, rel,
4955 relend, h, r_symndx, TRUE))
4958 if (r_type != R_386_TLS_LDM)
4960 /* LD->LE transition. Change
4961 leal foo@tlsldm(%ebx) %eax
4962 call ___tls_get_addr@PLT
4966 leal 0(%esi,1), %esi
4968 leal foo@tlsldm(%reg) %eax
4969 call *___tls_get_addr@GOT(%reg)
4970 which may be converted to
4971 addr32 call ___tls_get_addr
4974 leal 0(%esi), %esi */
4975 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4976 if (*(contents + rel->r_offset + 4) == 0xff
4977 || *(contents + rel->r_offset + 4) == 0x67)
4978 memcpy (contents + rel->r_offset - 2,
4979 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
4981 memcpy (contents + rel->r_offset - 2,
4982 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4983 /* Skip R_386_PC32/R_386_PLT32. */
4989 if (htab->elf.sgot == NULL)
4992 off = htab->tls_ldm_got.offset;
4997 Elf_Internal_Rela outrel;
4999 if (htab->elf.srelgot == NULL)
5002 outrel.r_offset = (htab->elf.sgot->output_section->vma
5003 + htab->elf.sgot->output_offset + off);
5005 bfd_put_32 (output_bfd, 0,
5006 htab->elf.sgot->contents + off);
5007 bfd_put_32 (output_bfd, 0,
5008 htab->elf.sgot->contents + off + 4);
5009 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5010 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5011 htab->tls_ldm_got.offset |= 1;
5013 relocation = htab->elf.sgot->output_section->vma
5014 + htab->elf.sgot->output_offset + off
5015 - htab->elf.sgotplt->output_section->vma
5016 - htab->elf.sgotplt->output_offset;
5017 unresolved_reloc = FALSE;
5020 case R_386_TLS_LDO_32:
5021 if (!bfd_link_executable (info)
5022 || (input_section->flags & SEC_CODE) == 0)
5023 relocation -= elf_i386_dtpoff_base (info);
5025 /* When converting LDO to LE, we must negate. */
5026 relocation = -elf_i386_tpoff (info, relocation);
5029 case R_386_TLS_LE_32:
5031 if (!bfd_link_executable (info))
5033 Elf_Internal_Rela outrel;
5036 outrel.r_offset = rel->r_offset
5037 + input_section->output_section->vma
5038 + input_section->output_offset;
5039 if (h != NULL && h->dynindx != -1)
5043 if (r_type == R_386_TLS_LE_32)
5044 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5046 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5047 sreloc = elf_section_data (input_section)->sreloc;
5050 elf_append_rel (output_bfd, sreloc, &outrel);
5053 else if (r_type == R_386_TLS_LE_32)
5054 relocation = elf_i386_dtpoff_base (info) - relocation;
5056 relocation -= elf_i386_dtpoff_base (info);
5058 else if (r_type == R_386_TLS_LE_32)
5059 relocation = elf_i386_tpoff (info, relocation);
5061 relocation = -elf_i386_tpoff (info, relocation);
5068 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5069 because such sections are not SEC_ALLOC and thus ld.so will
5070 not process them. */
5071 if (unresolved_reloc
5072 && !((input_section->flags & SEC_DEBUGGING) != 0
5074 && _bfd_elf_section_offset (output_bfd, info, input_section,
5075 rel->r_offset) != (bfd_vma) -1)
5077 (*_bfd_error_handler)
5078 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5081 (long) rel->r_offset,
5083 h->root.root.string);
5088 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5089 contents, rel->r_offset,
5092 check_relocation_error:
5093 if (r != bfd_reloc_ok)
5098 name = h->root.root.string;
5101 name = bfd_elf_string_from_elf_section (input_bfd,
5102 symtab_hdr->sh_link,
5107 name = bfd_section_name (input_bfd, sec);
5110 if (r == bfd_reloc_overflow)
5111 (*info->callbacks->reloc_overflow)
5112 (info, (h ? &h->root : NULL), name, howto->name,
5113 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5116 (*_bfd_error_handler)
5117 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5118 input_bfd, input_section,
5119 (long) rel->r_offset, name, (int) r);
5130 Elf_Internal_Shdr *rel_hdr;
5131 size_t deleted = rel - wrel;
5133 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5134 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5135 if (rel_hdr->sh_size == 0)
5137 /* It is too late to remove an empty reloc section. Leave
5139 ??? What is wrong with an empty section??? */
5140 rel_hdr->sh_size = rel_hdr->sh_entsize;
5143 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5144 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5145 input_section->reloc_count -= deleted;
5151 /* Finish up dynamic symbol handling. We set the contents of various
5152 dynamic sections here. */
5155 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5156 struct bfd_link_info *info,
5157 struct elf_link_hash_entry *h,
5158 Elf_Internal_Sym *sym)
5160 struct elf_i386_link_hash_table *htab;
5161 unsigned plt_entry_size;
5162 const struct elf_i386_backend_data *abed;
5163 struct elf_i386_link_hash_entry *eh;
5164 bfd_boolean local_undefweak;
5166 htab = elf_i386_hash_table (info);
5170 abed = get_elf_i386_backend_data (output_bfd);
5171 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5173 eh = (struct elf_i386_link_hash_entry *) h;
5175 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5176 resolved undefined weak symbols in executable so that their
5177 references have value 0 at run-time. */
5178 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5182 if (h->plt.offset != (bfd_vma) -1)
5186 Elf_Internal_Rela rel;
5188 asection *plt, *gotplt, *relplt;
5190 /* When building a static executable, use .iplt, .igot.plt and
5191 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5192 if (htab->elf.splt != NULL)
5194 plt = htab->elf.splt;
5195 gotplt = htab->elf.sgotplt;
5196 relplt = htab->elf.srelplt;
5200 plt = htab->elf.iplt;
5201 gotplt = htab->elf.igotplt;
5202 relplt = htab->elf.irelplt;
5205 /* This symbol has an entry in the procedure linkage table. Set
5208 if ((h->dynindx == -1
5210 && !((h->forced_local || bfd_link_executable (info))
5212 && h->type == STT_GNU_IFUNC))
5218 /* Get the index in the procedure linkage table which
5219 corresponds to this symbol. This is the index of this symbol
5220 in all the symbols for which we are making plt entries. The
5221 first entry in the procedure linkage table is reserved.
5223 Get the offset into the .got table of the entry that
5224 corresponds to this function. Each .got entry is 4 bytes.
5225 The first three are reserved.
5227 For static executables, we don't reserve anything. */
5229 if (plt == htab->elf.splt)
5231 got_offset = h->plt.offset / plt_entry_size - 1;
5232 got_offset = (got_offset + 3) * 4;
5236 got_offset = h->plt.offset / plt_entry_size;
5237 got_offset = got_offset * 4;
5240 /* Fill in the entry in the procedure linkage table. */
5241 if (! bfd_link_pic (info))
5243 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5244 abed->plt->plt_entry_size);
5245 bfd_put_32 (output_bfd,
5246 (gotplt->output_section->vma
5247 + gotplt->output_offset
5249 plt->contents + h->plt.offset
5250 + abed->plt->plt_got_offset);
5252 if (abed->is_vxworks)
5254 int s, k, reloc_index;
5256 /* Create the R_386_32 relocation referencing the GOT
5257 for this PLT entry. */
5259 /* S: Current slot number (zero-based). */
5260 s = ((h->plt.offset - abed->plt->plt_entry_size)
5261 / abed->plt->plt_entry_size);
5262 /* K: Number of relocations for PLTResolve. */
5263 if (bfd_link_pic (info))
5264 k = PLTRESOLVE_RELOCS_SHLIB;
5266 k = PLTRESOLVE_RELOCS;
5267 /* Skip the PLTresolve relocations, and the relocations for
5268 the other PLT slots. */
5269 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5270 loc = (htab->srelplt2->contents + reloc_index
5271 * sizeof (Elf32_External_Rel));
5273 rel.r_offset = (htab->elf.splt->output_section->vma
5274 + htab->elf.splt->output_offset
5275 + h->plt.offset + 2),
5276 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5277 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5279 /* Create the R_386_32 relocation referencing the beginning of
5280 the PLT for this GOT entry. */
5281 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5282 + htab->elf.sgotplt->output_offset
5284 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5285 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5286 loc + sizeof (Elf32_External_Rel));
5291 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5292 abed->plt->plt_entry_size);
5293 bfd_put_32 (output_bfd, got_offset,
5294 plt->contents + h->plt.offset
5295 + abed->plt->plt_got_offset);
5298 /* Fill in the entry in the global offset table. Leave the entry
5299 as zero for undefined weak symbol in PIE. No PLT relocation
5300 against undefined weak symbol in PIE. */
5301 if (!local_undefweak)
5303 bfd_put_32 (output_bfd,
5304 (plt->output_section->vma
5305 + plt->output_offset
5307 + abed->plt->plt_lazy_offset),
5308 gotplt->contents + got_offset);
5310 /* Fill in the entry in the .rel.plt section. */
5311 rel.r_offset = (gotplt->output_section->vma
5312 + gotplt->output_offset
5314 if (h->dynindx == -1
5315 || ((bfd_link_executable (info)
5316 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5318 && h->type == STT_GNU_IFUNC))
5320 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5321 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5322 in the .got.plt section. */
5323 bfd_put_32 (output_bfd,
5324 (h->root.u.def.value
5325 + h->root.u.def.section->output_section->vma
5326 + h->root.u.def.section->output_offset),
5327 gotplt->contents + got_offset);
5328 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5329 /* R_386_IRELATIVE comes last. */
5330 plt_index = htab->next_irelative_index--;
5334 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5335 plt_index = htab->next_jump_slot_index++;
5338 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5339 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5341 /* Don't fill PLT entry for static executables. */
5342 if (plt == htab->elf.splt)
5344 bfd_put_32 (output_bfd,
5345 plt_index * sizeof (Elf32_External_Rel),
5346 plt->contents + h->plt.offset
5347 + abed->plt->plt_reloc_offset);
5348 bfd_put_32 (output_bfd, - (h->plt.offset
5349 + abed->plt->plt_plt_offset + 4),
5350 plt->contents + h->plt.offset
5351 + abed->plt->plt_plt_offset);
5355 else if (eh->plt_got.offset != (bfd_vma) -1)
5357 bfd_vma got_offset, plt_offset;
5358 asection *plt, *got, *gotplt;
5359 const bfd_byte *got_plt_entry;
5361 /* Offset of displacement of the indirect jump. */
5362 bfd_vma plt_got_offset = 2;
5364 /* Set the entry in the GOT procedure linkage table. */
5365 plt = htab->plt_got;
5366 got = htab->elf.sgot;
5367 gotplt = htab->elf.sgotplt;
5368 got_offset = h->got.offset;
5370 if (got_offset == (bfd_vma) -1
5376 /* Fill in the entry in the GOT procedure linkage table. */
5377 if (! bfd_link_pic (info))
5379 got_plt_entry = elf_i386_got_plt_entry;
5380 got_offset += got->output_section->vma + got->output_offset;
5384 got_plt_entry = elf_i386_pic_got_plt_entry;
5385 got_offset += (got->output_section->vma
5386 + got->output_offset
5387 - gotplt->output_section->vma
5388 - gotplt->output_offset);
5391 plt_offset = eh->plt_got.offset;
5392 memcpy (plt->contents + plt_offset, got_plt_entry,
5393 sizeof (elf_i386_got_plt_entry));
5394 bfd_put_32 (output_bfd, got_offset,
5395 plt->contents + plt_offset + plt_got_offset);
5398 if (!local_undefweak
5400 && (h->plt.offset != (bfd_vma) -1
5401 || eh->plt_got.offset != (bfd_vma) -1))
5403 /* Mark the symbol as undefined, rather than as defined in
5404 the .plt section. Leave the value if there were any
5405 relocations where pointer equality matters (this is a clue
5406 for the dynamic linker, to make function pointer
5407 comparisons work between an application and shared
5408 library), otherwise set it to zero. If a function is only
5409 called from a binary, there is no need to slow down
5410 shared libraries because of that. */
5411 sym->st_shndx = SHN_UNDEF;
5412 if (!h->pointer_equality_needed)
5416 /* Don't generate dynamic GOT relocation against undefined weak
5417 symbol in executable. */
5418 if (h->got.offset != (bfd_vma) -1
5419 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5420 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5421 && !local_undefweak)
5423 Elf_Internal_Rela rel;
5425 /* This symbol has an entry in the global offset table. Set it
5428 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5431 rel.r_offset = (htab->elf.sgot->output_section->vma
5432 + htab->elf.sgot->output_offset
5433 + (h->got.offset & ~(bfd_vma) 1));
5435 /* If this is a static link, or it is a -Bsymbolic link and the
5436 symbol is defined locally or was forced to be local because
5437 of a version file, we just want to emit a RELATIVE reloc.
5438 The entry in the global offset table will already have been
5439 initialized in the relocate_section function. */
5441 && h->type == STT_GNU_IFUNC)
5443 if (bfd_link_pic (info))
5445 /* Generate R_386_GLOB_DAT. */
5452 if (!h->pointer_equality_needed)
5455 /* For non-shared object, we can't use .got.plt, which
5456 contains the real function addres if we need pointer
5457 equality. We load the GOT entry with the PLT entry. */
5458 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5459 bfd_put_32 (output_bfd,
5460 (plt->output_section->vma
5461 + plt->output_offset + h->plt.offset),
5462 htab->elf.sgot->contents + h->got.offset);
5466 else if (bfd_link_pic (info)
5467 && SYMBOL_REFERENCES_LOCAL (info, h))
5469 BFD_ASSERT((h->got.offset & 1) != 0);
5470 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5474 BFD_ASSERT((h->got.offset & 1) == 0);
5476 bfd_put_32 (output_bfd, (bfd_vma) 0,
5477 htab->elf.sgot->contents + h->got.offset);
5478 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5481 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5486 Elf_Internal_Rela rel;
5488 /* This symbol needs a copy reloc. Set it up. */
5490 if (h->dynindx == -1
5491 || (h->root.type != bfd_link_hash_defined
5492 && h->root.type != bfd_link_hash_defweak)
5493 || htab->srelbss == NULL)
5496 rel.r_offset = (h->root.u.def.value
5497 + h->root.u.def.section->output_section->vma
5498 + h->root.u.def.section->output_offset);
5499 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5500 elf_append_rel (output_bfd, htab->srelbss, &rel);
5506 /* Finish up local dynamic symbol handling. We set the contents of
5507 various dynamic sections here. */
5510 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5512 struct elf_link_hash_entry *h
5513 = (struct elf_link_hash_entry *) *slot;
5514 struct bfd_link_info *info
5515 = (struct bfd_link_info *) inf;
5517 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5521 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5522 here since undefined weak symbol may not be dynamic and may not be
5523 called for elf_i386_finish_dynamic_symbol. */
5526 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5529 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5530 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5532 if (h->root.type != bfd_link_hash_undefweak
5533 || h->dynindx != -1)
5536 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5540 /* Used to decide how to sort relocs in an optimal manner for the
5541 dynamic linker, before writing them out. */
5543 static enum elf_reloc_type_class
5544 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5545 const asection *rel_sec ATTRIBUTE_UNUSED,
5546 const Elf_Internal_Rela *rela)
5548 bfd *abfd = info->output_bfd;
5549 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5550 struct elf_link_hash_table *htab = elf_hash_table (info);
5552 if (htab->dynsym != NULL
5553 && htab->dynsym->contents != NULL)
5555 /* Check relocation against STT_GNU_IFUNC symbol if there are
5557 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5558 Elf_Internal_Sym sym;
5559 if (!bed->s->swap_symbol_in (abfd,
5560 (htab->dynsym->contents
5561 + r_symndx * sizeof (Elf32_External_Sym)),
5565 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5566 return reloc_class_ifunc;
5569 switch (ELF32_R_TYPE (rela->r_info))
5571 case R_386_RELATIVE:
5572 return reloc_class_relative;
5573 case R_386_JUMP_SLOT:
5574 return reloc_class_plt;
5576 return reloc_class_copy;
5578 return reloc_class_normal;
5582 /* Finish up the dynamic sections. */
5585 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5586 struct bfd_link_info *info)
5588 struct elf_i386_link_hash_table *htab;
5591 const struct elf_i386_backend_data *abed;
5593 htab = elf_i386_hash_table (info);
5597 dynobj = htab->elf.dynobj;
5598 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5599 abed = get_elf_i386_backend_data (output_bfd);
5601 if (htab->elf.dynamic_sections_created)
5603 Elf32_External_Dyn *dyncon, *dynconend;
5605 if (sdyn == NULL || htab->elf.sgot == NULL)
5608 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5609 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5610 for (; dyncon < dynconend; dyncon++)
5612 Elf_Internal_Dyn dyn;
5615 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5620 if (abed->is_vxworks
5621 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5626 s = htab->elf.sgotplt;
5627 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5631 s = htab->elf.srelplt;
5632 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5636 s = htab->elf.srelplt;
5637 dyn.d_un.d_val = s->size;
5641 /* My reading of the SVR4 ABI indicates that the
5642 procedure linkage table relocs (DT_JMPREL) should be
5643 included in the overall relocs (DT_REL). This is
5644 what Solaris does. However, UnixWare can not handle
5645 that case. Therefore, we override the DT_RELSZ entry
5646 here to make it not include the JMPREL relocs. */
5647 s = htab->elf.srelplt;
5650 dyn.d_un.d_val -= s->size;
5654 /* We may not be using the standard ELF linker script.
5655 If .rel.plt is the first .rel section, we adjust
5656 DT_REL to not include it. */
5657 s = htab->elf.srelplt;
5660 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5662 dyn.d_un.d_ptr += s->size;
5666 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5669 /* Fill in the first entry in the procedure linkage table. */
5670 if (htab->elf.splt && htab->elf.splt->size > 0)
5672 if (bfd_link_pic (info))
5674 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5675 abed->plt->plt0_entry_size);
5676 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5677 abed->plt0_pad_byte,
5678 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5682 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5683 abed->plt->plt0_entry_size);
5684 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5685 abed->plt0_pad_byte,
5686 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5687 bfd_put_32 (output_bfd,
5688 (htab->elf.sgotplt->output_section->vma
5689 + htab->elf.sgotplt->output_offset
5691 htab->elf.splt->contents
5692 + abed->plt->plt0_got1_offset);
5693 bfd_put_32 (output_bfd,
5694 (htab->elf.sgotplt->output_section->vma
5695 + htab->elf.sgotplt->output_offset
5697 htab->elf.splt->contents
5698 + abed->plt->plt0_got2_offset);
5700 if (abed->is_vxworks)
5702 Elf_Internal_Rela rel;
5704 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5705 On IA32 we use REL relocations so the addend goes in
5706 the PLT directly. */
5707 rel.r_offset = (htab->elf.splt->output_section->vma
5708 + htab->elf.splt->output_offset
5709 + abed->plt->plt0_got1_offset);
5710 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5711 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5712 htab->srelplt2->contents);
5713 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5714 rel.r_offset = (htab->elf.splt->output_section->vma
5715 + htab->elf.splt->output_offset
5716 + abed->plt->plt0_got2_offset);
5717 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5718 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5719 htab->srelplt2->contents +
5720 sizeof (Elf32_External_Rel));
5724 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5725 really seem like the right value. */
5726 elf_section_data (htab->elf.splt->output_section)
5727 ->this_hdr.sh_entsize = 4;
5729 /* Correct the .rel.plt.unloaded relocations. */
5730 if (abed->is_vxworks && !bfd_link_pic (info))
5732 int num_plts = (htab->elf.splt->size
5733 / abed->plt->plt_entry_size) - 1;
5736 p = htab->srelplt2->contents;
5737 if (bfd_link_pic (info))
5738 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5740 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5742 for (; num_plts; num_plts--)
5744 Elf_Internal_Rela rel;
5745 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5746 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5747 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5748 p += sizeof (Elf32_External_Rel);
5750 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5751 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5752 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5753 p += sizeof (Elf32_External_Rel);
5759 if (htab->elf.sgotplt)
5761 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5763 (*_bfd_error_handler)
5764 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5768 /* Fill in the first three entries in the global offset table. */
5769 if (htab->elf.sgotplt->size > 0)
5771 bfd_put_32 (output_bfd,
5773 : sdyn->output_section->vma + sdyn->output_offset),
5774 htab->elf.sgotplt->contents);
5775 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5776 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5779 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5782 /* Adjust .eh_frame for .plt section. */
5783 if (htab->plt_eh_frame != NULL
5784 && htab->plt_eh_frame->contents != NULL)
5786 if (htab->elf.splt != NULL
5787 && htab->elf.splt->size != 0
5788 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5789 && htab->elf.splt->output_section != NULL
5790 && htab->plt_eh_frame->output_section != NULL)
5792 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5793 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5794 + htab->plt_eh_frame->output_offset
5795 + PLT_FDE_START_OFFSET;
5796 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5797 htab->plt_eh_frame->contents
5798 + PLT_FDE_START_OFFSET);
5800 if (htab->plt_eh_frame->sec_info_type
5801 == SEC_INFO_TYPE_EH_FRAME)
5803 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5805 htab->plt_eh_frame->contents))
5810 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5811 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5813 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5814 htab_traverse (htab->loc_hash_table,
5815 elf_i386_finish_local_dynamic_symbol,
5818 /* Fill PLT entries for undefined weak symbols in PIE. */
5819 if (bfd_link_pie (info))
5820 bfd_hash_traverse (&info->hash->table,
5821 elf_i386_pie_finish_undefweak_symbol,
5827 /* Return an array of PLT entry symbol values. */
5830 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5833 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5836 bfd_vma *plt_sym_val;
5838 bfd_byte *plt_contents;
5839 const struct elf_i386_backend_data *bed
5840 = get_elf_i386_backend_data (abfd);
5841 Elf_Internal_Shdr *hdr;
5843 /* Get the .plt section contents. */
5844 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5845 if (plt_contents == NULL)
5847 if (!bfd_get_section_contents (abfd, (asection *) plt,
5848 plt_contents, 0, plt->size))
5851 free (plt_contents);
5855 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5856 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5859 hdr = &elf_section_data (relplt)->this_hdr;
5860 count = relplt->size / hdr->sh_entsize;
5862 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5863 if (plt_sym_val == NULL)
5866 for (i = 0; i < count; i++)
5867 plt_sym_val[i] = -1;
5869 plt_offset = bed->plt->plt_entry_size;
5870 p = relplt->relocation;
5871 for (i = 0; i < count; i++, p++)
5875 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5876 if (p->howto == NULL)
5879 if (p->howto->type != R_386_JUMP_SLOT
5880 && p->howto->type != R_386_IRELATIVE)
5883 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5884 + bed->plt->plt_reloc_offset));
5885 reloc_index /= sizeof (Elf32_External_Rel);
5886 if (reloc_index < count)
5887 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5889 plt_offset += bed->plt->plt_entry_size;
5891 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5893 if (plt_offset >= plt->size)
5897 free (plt_contents);
5902 /* Similar to _bfd_elf_get_synthetic_symtab. */
5905 elf_i386_get_synthetic_symtab (bfd *abfd,
5912 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5913 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5914 dynsymcount, dynsyms, ret,
5916 elf_i386_get_plt_sym_val);
5919 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5922 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5924 if (h->plt.offset != (bfd_vma) -1
5926 && !h->pointer_equality_needed)
5929 return _bfd_elf_hash_symbol (h);
5932 #define TARGET_LITTLE_SYM i386_elf32_vec
5933 #define TARGET_LITTLE_NAME "elf32-i386"
5934 #define ELF_ARCH bfd_arch_i386
5935 #define ELF_TARGET_ID I386_ELF_DATA
5936 #define ELF_MACHINE_CODE EM_386
5937 #define ELF_MAXPAGESIZE 0x1000
5939 #define elf_backend_can_gc_sections 1
5940 #define elf_backend_can_refcount 1
5941 #define elf_backend_want_got_plt 1
5942 #define elf_backend_plt_readonly 1
5943 #define elf_backend_want_plt_sym 0
5944 #define elf_backend_got_header_size 12
5945 #define elf_backend_plt_alignment 4
5946 #define elf_backend_extern_protected_data 1
5947 #define elf_backend_caches_rawsize 1
5949 /* Support RELA for objdump of prelink objects. */
5950 #define elf_info_to_howto elf_i386_info_to_howto_rel
5951 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5953 #define bfd_elf32_mkobject elf_i386_mkobject
5955 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5956 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5957 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5958 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5959 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5961 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5962 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5963 #define elf_backend_check_relocs elf_i386_check_relocs
5964 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5965 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5966 #define elf_backend_fake_sections elf_i386_fake_sections
5967 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5968 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5969 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5970 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5971 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5972 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5973 #define elf_backend_relocate_section elf_i386_relocate_section
5974 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5975 #define elf_backend_always_size_sections elf_i386_always_size_sections
5976 #define elf_backend_omit_section_dynsym \
5977 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5978 #define elf_backend_hash_symbol elf_i386_hash_symbol
5979 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
5981 #include "elf32-target.h"
5983 /* FreeBSD support. */
5985 #undef TARGET_LITTLE_SYM
5986 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5987 #undef TARGET_LITTLE_NAME
5988 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5990 #define ELF_OSABI ELFOSABI_FREEBSD
5992 /* The kernel recognizes executables as valid only if they carry a
5993 "FreeBSD" label in the ELF header. So we put this label on all
5994 executables and (for simplicity) also all other object files. */
5997 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5999 _bfd_elf_post_process_headers (abfd, info);
6001 #ifdef OLD_FREEBSD_ABI_LABEL
6003 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6004 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6005 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6010 #undef elf_backend_post_process_headers
6011 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6013 #define elf32_bed elf32_i386_fbsd_bed
6015 #undef elf_backend_add_symbol_hook
6017 #include "elf32-target.h"
6021 #undef TARGET_LITTLE_SYM
6022 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6023 #undef TARGET_LITTLE_NAME
6024 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6026 #undef elf_backend_post_process_headers
6028 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6029 objects won't be recognized. */
6033 #define elf32_bed elf32_i386_sol2_bed
6035 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6037 #undef elf_backend_static_tls_alignment
6038 #define elf_backend_static_tls_alignment 8
6040 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6042 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6044 #undef elf_backend_want_plt_sym
6045 #define elf_backend_want_plt_sym 1
6047 #undef elf_backend_strtab_flags
6048 #define elf_backend_strtab_flags SHF_STRINGS
6050 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6051 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6052 FALSE otherwise. ISECTION is the best guess matching section from the
6053 input bfd IBFD, but it might be NULL. */
6056 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6057 bfd *obfd ATTRIBUTE_UNUSED,
6058 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6059 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6061 /* PR 19938: FIXME: Need to add code for setting the sh_info
6062 and sh_link fields of Solaris specific section types. */
6065 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6066 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6068 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6070 The following values should be set:
6073 -----------------------------------------------------------------------------
6074 SHT_SUNW_ancillary The section header index of 0
6075 [0x6fffffee] the associated string table.
6077 SHT_SUNW_capinfo The section header index of For a dynamic object, the
6078 [0x6ffffff0] the associated symbol table. section header index of
6080 SHT_SUNW_capchain table,
6083 SHT_SUNW_symsort The section header index of 0
6084 [0x6ffffff1] the associated symbol table.
6086 SHT_SUNW_tlssort The section header index of 0
6087 [0x6ffffff2] the associated symbol table.
6089 SHT_SUNW_LDYNSYM The section header index of One greater than the
6090 [0x6ffffff3] the associated string table. symbol table index of the
6091 This index is the same string last local symbol,
6092 table used by the SHT_DYNSYM STB_LOCAL. Since
6093 section. SHT_SUNW_LDYNSYM only
6094 contains local symbols,
6095 sh_info is equivalent to
6096 the number of symbols in
6099 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6100 [0x6ffffff5] the section header index of to named strings, the
6101 the associated section header index of
6102 SHT_SUNW_capinfo table, the associated string
6103 otherwise 0. table, otherwise 0.
6105 SHT_SUNW_move The section header index of 0
6106 [0x6ffffffa] the associated symbol table.
6111 SHT_SUNW_syminfo The section header index of The section header index
6112 [0x6ffffffc] the associated symbol table. of the associated
6115 SHT_SUNW_verdef The section header index of The number of version
6116 [0x6ffffffd] the associated string table. definitions within the
6119 SHT_SUNW_verneed The section header index of The number of version
6120 [0x6ffffffe] the associated string table. dependencies within the
6123 SHT_SUNW_versym The section header index of 0
6124 [0x6fffffff] the associated symbol table. */
6127 #undef elf_backend_copy_special_section_fields
6128 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6130 #include "elf32-target.h"
6132 /* Intel MCU support. */
6135 elf32_iamcu_elf_object_p (bfd *abfd)
6137 /* Set the right machine number for an IAMCU elf32 file. */
6138 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6142 #undef TARGET_LITTLE_SYM
6143 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6144 #undef TARGET_LITTLE_NAME
6145 #define TARGET_LITTLE_NAME "elf32-iamcu"
6147 #define ELF_ARCH bfd_arch_iamcu
6149 #undef ELF_MACHINE_CODE
6150 #define ELF_MACHINE_CODE EM_IAMCU
6155 #define elf32_bed elf32_iamcu_bed
6157 #undef elf_backend_object_p
6158 #define elf_backend_object_p elf32_iamcu_elf_object_p
6160 #undef elf_backend_static_tls_alignment
6162 #undef elf_backend_want_plt_sym
6163 #define elf_backend_want_plt_sym 0
6165 #undef elf_backend_strtab_flags
6166 #undef elf_backend_copy_special_section_fields
6168 #include "elf32-target.h"
6170 /* Restore defaults. */
6172 #define ELF_ARCH bfd_arch_i386
6173 #undef ELF_MACHINE_CODE
6174 #define ELF_MACHINE_CODE EM_386
6176 /* Native Client support. */
6178 #undef TARGET_LITTLE_SYM
6179 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6180 #undef TARGET_LITTLE_NAME
6181 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6183 #define elf32_bed elf32_i386_nacl_bed
6185 #undef ELF_MAXPAGESIZE
6186 #define ELF_MAXPAGESIZE 0x10000
6188 /* Restore defaults. */
6190 #undef elf_backend_want_plt_sym
6191 #define elf_backend_want_plt_sym 0
6192 #undef elf_backend_post_process_headers
6193 #undef elf_backend_static_tls_alignment
6195 /* NaCl uses substantially different PLT entries for the same effects. */
6197 #undef elf_backend_plt_alignment
6198 #define elf_backend_plt_alignment 5
6199 #define NACL_PLT_ENTRY_SIZE 64
6200 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6202 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6204 0xff, 0x35, /* pushl contents of address */
6205 0, 0, 0, 0, /* replaced with address of .got + 4. */
6206 0x8b, 0x0d, /* movl contents of address, %ecx */
6207 0, 0, 0, 0, /* replaced with address of .got + 8. */
6208 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6209 0xff, 0xe1 /* jmp *%ecx */
6212 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6214 0x8b, 0x0d, /* movl contents of address, %ecx */
6215 0, 0, 0, 0, /* replaced with GOT slot address. */
6216 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6217 0xff, 0xe1, /* jmp *%ecx */
6219 /* Pad to the next 32-byte boundary with nop instructions. */
6221 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6222 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6224 /* Lazy GOT entries point here (32-byte aligned). */
6225 0x68, /* pushl immediate */
6226 0, 0, 0, 0, /* replaced with reloc offset. */
6227 0xe9, /* jmp relative */
6228 0, 0, 0, 0, /* replaced with offset to .plt. */
6230 /* Pad to the next 32-byte boundary with nop instructions. */
6231 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6232 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6236 static const bfd_byte
6237 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6239 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6240 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6241 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6242 0xff, 0xe1, /* jmp *%ecx */
6244 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6245 so pad to that size with nop instructions. */
6246 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6249 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6251 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6252 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6253 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6254 0xff, 0xe1, /* jmp *%ecx */
6256 /* Pad to the next 32-byte boundary with nop instructions. */
6258 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6259 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6261 /* Lazy GOT entries point here (32-byte aligned). */
6262 0x68, /* pushl immediate */
6263 0, 0, 0, 0, /* replaced with offset into relocation table. */
6264 0xe9, /* jmp relative */
6265 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6267 /* Pad to the next 32-byte boundary with nop instructions. */
6268 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6269 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6273 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6275 #if (PLT_CIE_LENGTH != 20 \
6276 || PLT_FDE_LENGTH != 36 \
6277 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6278 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6279 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6281 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6282 0, 0, 0, 0, /* CIE ID */
6283 1, /* CIE version */
6284 'z', 'R', 0, /* Augmentation string */
6285 1, /* Code alignment factor */
6286 0x7c, /* Data alignment factor: -4 */
6287 8, /* Return address column */
6288 1, /* Augmentation size */
6289 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6290 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6291 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6292 DW_CFA_nop, DW_CFA_nop,
6294 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6295 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6296 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6297 0, 0, 0, 0, /* .plt size goes here */
6298 0, /* Augmentation size */
6299 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6300 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6301 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6302 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6303 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6304 13, /* Block length */
6305 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6306 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6307 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6308 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6309 DW_CFA_nop, DW_CFA_nop
6312 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6314 elf_i386_nacl_plt0_entry, /* plt0_entry */
6315 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6316 2, /* plt0_got1_offset */
6317 8, /* plt0_got2_offset */
6318 elf_i386_nacl_plt_entry, /* plt_entry */
6319 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6320 2, /* plt_got_offset */
6321 33, /* plt_reloc_offset */
6322 38, /* plt_plt_offset */
6323 32, /* plt_lazy_offset */
6324 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6325 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6326 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6327 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6330 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6332 &elf_i386_nacl_plt, /* plt */
6333 0x90, /* plt0_pad_byte: nop insn */
6338 elf32_i386_nacl_elf_object_p (bfd *abfd)
6340 /* Set the right machine number for a NaCl i386 ELF32 file. */
6341 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6345 #undef elf_backend_arch_data
6346 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6348 #undef elf_backend_object_p
6349 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6350 #undef elf_backend_modify_segment_map
6351 #define elf_backend_modify_segment_map nacl_modify_segment_map
6352 #undef elf_backend_modify_program_headers
6353 #define elf_backend_modify_program_headers nacl_modify_program_headers
6354 #undef elf_backend_final_write_processing
6355 #define elf_backend_final_write_processing nacl_final_write_processing
6357 #include "elf32-target.h"
6359 /* Restore defaults. */
6360 #undef elf_backend_object_p
6361 #undef elf_backend_modify_segment_map
6362 #undef elf_backend_modify_program_headers
6363 #undef elf_backend_final_write_processing
6365 /* VxWorks support. */
6367 #undef TARGET_LITTLE_SYM
6368 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6369 #undef TARGET_LITTLE_NAME
6370 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6372 #undef elf_backend_plt_alignment
6373 #define elf_backend_plt_alignment 4
6375 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6377 &elf_i386_plt, /* plt */
6378 0x90, /* plt0_pad_byte */
6382 #undef elf_backend_arch_data
6383 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6385 #undef elf_backend_relocs_compatible
6386 #undef elf_backend_add_symbol_hook
6387 #define elf_backend_add_symbol_hook \
6388 elf_vxworks_add_symbol_hook
6389 #undef elf_backend_link_output_symbol_hook
6390 #define elf_backend_link_output_symbol_hook \
6391 elf_vxworks_link_output_symbol_hook
6392 #undef elf_backend_emit_relocs
6393 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6394 #undef elf_backend_final_write_processing
6395 #define elf_backend_final_write_processing \
6396 elf_vxworks_final_write_processing
6397 #undef elf_backend_static_tls_alignment
6399 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6401 #undef elf_backend_want_plt_sym
6402 #define elf_backend_want_plt_sym 1
6405 #define elf32_bed elf32_i386_vxworks_bed
6407 #include "elf32-target.h"