1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 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"
33 /* 386 uses REL relocations instead of RELA. */
38 static reloc_howto_type elf_howto_table[]=
40 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
135 bfd_elf_generic_reloc, "R_386_SIZE32",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
159 FALSE, /* pc_relative */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
167 FALSE), /* pcrel_offset */
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
174 FALSE, /* pc_relative */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
182 FALSE) /* pcrel_offset */
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
188 #ifdef DEBUG_GEN_RELOC
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
335 case BFD_RELOC_VTABLE_INHERIT:
336 TRACE ("BFD_RELOC_VTABLE_INHERIT");
337 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
339 case BFD_RELOC_VTABLE_ENTRY:
340 TRACE ("BFD_RELOC_VTABLE_ENTRY");
341 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_irelative - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
376 >= R_386_vt - R_386_irelative))
378 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
382 /* PR 17512: file: 0f67f69d. */
383 if (elf_howto_table [indx].type != r_type)
385 return &elf_howto_table[indx];
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
391 Elf_Internal_Rela *dst)
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
406 if (name[0] == '.' && name[1] == 'X')
409 return _bfd_elf_is_local_label_name (abfd, name);
412 /* Support for core dump NOTE sections. */
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
422 int pr_version = bfd_get_32 (abfd, note->descdata);
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
435 size = bfd_get_32 (abfd, note->descdata + 8);
439 switch (note->descsz)
444 case 144: /* Linux/i386 */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
469 int pr_version = bfd_get_32 (abfd, note->descdata);
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
481 switch (note->descsz)
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
510 /* Functions for the i386 ELF linker.
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
524 /* The name of the dynamic interpreter. This is put in the .interp
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
533 #define ELIMINATE_COPY_RELOCS 1
535 /* The size in bytes of an entry in the procedure linkage table. */
537 #define PLT_ENTRY_SIZE 16
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
543 static const bfd_byte elf_i386_plt0_entry[12] =
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
551 /* Subsequent entries in an absolute procedure linkage table look like
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
585 /* Entries in the GOT procedure linkage table look like this. */
587 static const bfd_byte elf_i386_got_plt_entry[8] =
589 0xff, 0x25, /* jmp indirect */
590 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
591 0x66, 0x90 /* xchg %ax,%ax */
594 /* Entries in the PIC GOT procedure linkage table look like this. */
596 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* .eh_frame covering the .plt section. */
605 static const bfd_byte elf_i386_eh_frame_plt[] =
607 #define PLT_CIE_LENGTH 20
608 #define PLT_FDE_LENGTH 36
609 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
610 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
611 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
612 0, 0, 0, 0, /* CIE ID */
614 'z', 'R', 0, /* Augmentation string */
615 1, /* Code alignment factor */
616 0x7c, /* Data alignment factor */
617 8, /* Return address column */
618 1, /* Augmentation size */
619 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
620 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
621 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
622 DW_CFA_nop, DW_CFA_nop,
624 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
625 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
626 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
627 0, 0, 0, 0, /* .plt size goes here */
628 0, /* Augmentation size */
629 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
630 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
631 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
632 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
633 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
634 11, /* Block length */
635 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
636 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
637 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
638 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
639 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
642 struct elf_i386_plt_layout
644 /* The first entry in an absolute procedure linkage table looks like this. */
645 const bfd_byte *plt0_entry;
646 unsigned int plt0_entry_size;
648 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
649 unsigned int plt0_got1_offset;
650 unsigned int plt0_got2_offset;
652 /* Later entries in an absolute procedure linkage table look like this. */
653 const bfd_byte *plt_entry;
654 unsigned int plt_entry_size;
656 /* Offsets into plt_entry that are to be replaced with... */
657 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
658 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
659 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
661 /* Offset into plt_entry where the initial value of the GOT entry points. */
662 unsigned int plt_lazy_offset;
664 /* The first entry in a PIC procedure linkage table looks like this. */
665 const bfd_byte *pic_plt0_entry;
667 /* Subsequent entries in a PIC procedure linkage table look like this. */
668 const bfd_byte *pic_plt_entry;
670 /* .eh_frame covering the .plt section. */
671 const bfd_byte *eh_frame_plt;
672 unsigned int eh_frame_plt_size;
675 #define GET_PLT_ENTRY_SIZE(abfd) \
676 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
678 /* These are the standard parameters. */
679 static const struct elf_i386_plt_layout elf_i386_plt =
681 elf_i386_plt0_entry, /* plt0_entry */
682 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
683 2, /* plt0_got1_offset */
684 8, /* plt0_got2_offset */
685 elf_i386_plt_entry, /* plt_entry */
686 PLT_ENTRY_SIZE, /* plt_entry_size */
687 2, /* plt_got_offset */
688 7, /* plt_reloc_offset */
689 12, /* plt_plt_offset */
690 6, /* plt_lazy_offset */
691 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
692 elf_i386_pic_plt_entry, /* pic_plt_entry */
693 elf_i386_eh_frame_plt, /* eh_frame_plt */
694 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
698 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
699 for the PLTResolve stub and then for each PLT entry. */
700 #define PLTRESOLVE_RELOCS_SHLIB 0
701 #define PLTRESOLVE_RELOCS 2
702 #define PLT_NON_JUMP_SLOT_RELOCS 2
704 /* Architecture-specific backend data for i386. */
706 struct elf_i386_backend_data
708 /* Parameters describing PLT generation. */
709 const struct elf_i386_plt_layout *plt;
711 /* Value used to fill the unused bytes of the first PLT entry. */
712 bfd_byte plt0_pad_byte;
714 /* True if the target system is VxWorks. */
718 #define get_elf_i386_backend_data(abfd) \
719 ((const struct elf_i386_backend_data *) \
720 get_elf_backend_data (abfd)->arch_data)
722 /* These are the standard parameters. */
723 static const struct elf_i386_backend_data elf_i386_arch_bed =
725 &elf_i386_plt, /* plt */
726 0, /* plt0_pad_byte */
730 #define elf_backend_arch_data &elf_i386_arch_bed
732 /* i386 ELF linker hash entry. */
734 struct elf_i386_link_hash_entry
736 struct elf_link_hash_entry elf;
738 /* Track dynamic relocs copied for this symbol. */
739 struct elf_dyn_relocs *dyn_relocs;
741 #define GOT_UNKNOWN 0
745 #define GOT_TLS_IE_POS 5
746 #define GOT_TLS_IE_NEG 6
747 #define GOT_TLS_IE_BOTH 7
748 #define GOT_TLS_GDESC 8
749 #define GOT_TLS_GD_BOTH_P(type) \
750 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
751 #define GOT_TLS_GD_P(type) \
752 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
753 #define GOT_TLS_GDESC_P(type) \
754 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
755 #define GOT_TLS_GD_ANY_P(type) \
756 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
757 unsigned char tls_type;
759 /* Symbol is referenced by R_386_GOTOFF relocation. */
760 unsigned int gotoff_ref : 1;
762 /* Information about the GOT PLT entry. Filled when there are both
763 GOT and PLT relocations against the same function. */
764 union gotplt_union plt_got;
766 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
767 starting at the end of the jump table. */
771 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
773 struct elf_i386_obj_tdata
775 struct elf_obj_tdata root;
777 /* tls_type for each local got entry. */
778 char *local_got_tls_type;
780 /* GOTPLT entries for TLS descriptors. */
781 bfd_vma *local_tlsdesc_gotent;
784 #define elf_i386_tdata(abfd) \
785 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
787 #define elf_i386_local_got_tls_type(abfd) \
788 (elf_i386_tdata (abfd)->local_got_tls_type)
790 #define elf_i386_local_tlsdesc_gotent(abfd) \
791 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
793 #define is_i386_elf(bfd) \
794 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
795 && elf_tdata (bfd) != NULL \
796 && elf_object_id (bfd) == I386_ELF_DATA)
799 elf_i386_mkobject (bfd *abfd)
801 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
805 /* i386 ELF linker hash table. */
807 struct elf_i386_link_hash_table
809 struct elf_link_hash_table elf;
811 /* Short-cuts to get to dynamic linker sections. */
814 asection *plt_eh_frame;
819 bfd_signed_vma refcount;
823 /* The amount of space used by the reserved portion of the sgotplt
824 section, plus whatever space is used by the jump slots. */
825 bfd_vma sgotplt_jump_table_size;
827 /* Small local sym cache. */
828 struct sym_cache sym_cache;
830 /* _TLS_MODULE_BASE_ symbol. */
831 struct bfd_link_hash_entry *tls_module_base;
833 /* Used by local STT_GNU_IFUNC symbols. */
834 htab_t loc_hash_table;
835 void * loc_hash_memory;
837 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
840 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
841 bfd_vma next_tls_desc_index;
843 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
844 bfd_vma next_jump_slot_index;
846 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
847 bfd_vma next_irelative_index;
850 /* Get the i386 ELF linker hash table from a link_info structure. */
852 #define elf_i386_hash_table(p) \
853 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
854 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
856 #define elf_i386_compute_jump_table_size(htab) \
857 ((htab)->elf.srelplt->reloc_count * 4)
859 /* Create an entry in an i386 ELF linker hash table. */
861 static struct bfd_hash_entry *
862 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
863 struct bfd_hash_table *table,
866 /* Allocate the structure if it has not already been allocated by a
870 entry = (struct bfd_hash_entry *)
871 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
876 /* Call the allocation method of the superclass. */
877 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
880 struct elf_i386_link_hash_entry *eh;
882 eh = (struct elf_i386_link_hash_entry *) entry;
883 eh->dyn_relocs = NULL;
884 eh->tls_type = GOT_UNKNOWN;
886 eh->plt_got.offset = (bfd_vma) -1;
887 eh->tlsdesc_got = (bfd_vma) -1;
893 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
894 for local symbol so that we can handle local STT_GNU_IFUNC symbols
895 as global symbol. We reuse indx and dynstr_index for local symbol
896 hash since they aren't used by global symbols in this backend. */
899 elf_i386_local_htab_hash (const void *ptr)
901 struct elf_link_hash_entry *h
902 = (struct elf_link_hash_entry *) ptr;
903 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
906 /* Compare local hash entries. */
909 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
911 struct elf_link_hash_entry *h1
912 = (struct elf_link_hash_entry *) ptr1;
913 struct elf_link_hash_entry *h2
914 = (struct elf_link_hash_entry *) ptr2;
916 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
919 /* Find and/or create a hash entry for local symbol. */
921 static struct elf_link_hash_entry *
922 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
923 bfd *abfd, const Elf_Internal_Rela *rel,
926 struct elf_i386_link_hash_entry e, *ret;
927 asection *sec = abfd->sections;
928 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
929 ELF32_R_SYM (rel->r_info));
932 e.elf.indx = sec->id;
933 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
934 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
935 create ? INSERT : NO_INSERT);
942 ret = (struct elf_i386_link_hash_entry *) *slot;
946 ret = (struct elf_i386_link_hash_entry *)
947 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
948 sizeof (struct elf_i386_link_hash_entry));
951 memset (ret, 0, sizeof (*ret));
952 ret->elf.indx = sec->id;
953 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
954 ret->elf.dynindx = -1;
955 ret->plt_got.offset = (bfd_vma) -1;
961 /* Destroy an i386 ELF linker hash table. */
964 elf_i386_link_hash_table_free (bfd *obfd)
966 struct elf_i386_link_hash_table *htab
967 = (struct elf_i386_link_hash_table *) obfd->link.hash;
969 if (htab->loc_hash_table)
970 htab_delete (htab->loc_hash_table);
971 if (htab->loc_hash_memory)
972 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
973 _bfd_elf_link_hash_table_free (obfd);
976 /* Create an i386 ELF linker hash table. */
978 static struct bfd_link_hash_table *
979 elf_i386_link_hash_table_create (bfd *abfd)
981 struct elf_i386_link_hash_table *ret;
982 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
984 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
988 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
989 elf_i386_link_hash_newfunc,
990 sizeof (struct elf_i386_link_hash_entry),
997 ret->loc_hash_table = htab_try_create (1024,
998 elf_i386_local_htab_hash,
999 elf_i386_local_htab_eq,
1001 ret->loc_hash_memory = objalloc_create ();
1002 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1004 elf_i386_link_hash_table_free (abfd);
1007 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1009 return &ret->elf.root;
1012 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1013 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1017 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1019 struct elf_i386_link_hash_table *htab;
1021 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1024 htab = elf_i386_hash_table (info);
1028 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1032 if (info->executable)
1034 /* Always allow copy relocs for building executables. */
1035 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1038 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1039 s = bfd_make_section_anyway_with_flags (dynobj,
1041 (bed->dynamic_sec_flags
1044 || ! bfd_set_section_alignment (dynobj, s,
1045 bed->s->log_file_align))
1051 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1052 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1056 if (!info->no_ld_generated_unwind_info
1057 && htab->plt_eh_frame == NULL
1058 && htab->elf.splt != NULL)
1060 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1061 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED);
1064 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1065 if (htab->plt_eh_frame == NULL
1066 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1073 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1076 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1077 struct elf_link_hash_entry *dir,
1078 struct elf_link_hash_entry *ind)
1080 struct elf_i386_link_hash_entry *edir, *eind;
1082 edir = (struct elf_i386_link_hash_entry *) dir;
1083 eind = (struct elf_i386_link_hash_entry *) ind;
1085 if (eind->dyn_relocs != NULL)
1087 if (edir->dyn_relocs != NULL)
1089 struct elf_dyn_relocs **pp;
1090 struct elf_dyn_relocs *p;
1092 /* Add reloc counts against the indirect sym to the direct sym
1093 list. Merge any entries against the same section. */
1094 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1096 struct elf_dyn_relocs *q;
1098 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1099 if (q->sec == p->sec)
1101 q->pc_count += p->pc_count;
1102 q->count += p->count;
1109 *pp = edir->dyn_relocs;
1112 edir->dyn_relocs = eind->dyn_relocs;
1113 eind->dyn_relocs = NULL;
1116 if (ind->root.type == bfd_link_hash_indirect
1117 && dir->got.refcount <= 0)
1119 edir->tls_type = eind->tls_type;
1120 eind->tls_type = GOT_UNKNOWN;
1123 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1124 generate a R_386_COPY reloc. */
1125 edir->gotoff_ref |= eind->gotoff_ref;
1127 if (ELIMINATE_COPY_RELOCS
1128 && ind->root.type != bfd_link_hash_indirect
1129 && dir->dynamic_adjusted)
1131 /* If called to transfer flags for a weakdef during processing
1132 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1133 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1134 dir->ref_dynamic |= ind->ref_dynamic;
1135 dir->ref_regular |= ind->ref_regular;
1136 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1137 dir->needs_plt |= ind->needs_plt;
1138 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1141 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1144 /* Return TRUE if the TLS access code sequence support transition
1148 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1150 Elf_Internal_Shdr *symtab_hdr,
1151 struct elf_link_hash_entry **sym_hashes,
1152 unsigned int r_type,
1153 const Elf_Internal_Rela *rel,
1154 const Elf_Internal_Rela *relend)
1156 unsigned int val, type;
1157 unsigned long r_symndx;
1158 struct elf_link_hash_entry *h;
1161 /* Get the section contents. */
1162 if (contents == NULL)
1164 if (elf_section_data (sec)->this_hdr.contents != NULL)
1165 contents = elf_section_data (sec)->this_hdr.contents;
1168 /* FIXME: How to better handle error condition? */
1169 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1172 /* Cache the section contents for elf_link_input_bfd. */
1173 elf_section_data (sec)->this_hdr.contents = contents;
1177 offset = rel->r_offset;
1182 if (offset < 2 || (rel + 1) >= relend)
1185 type = bfd_get_8 (abfd, contents + offset - 2);
1186 if (r_type == R_386_TLS_GD)
1188 /* Check transition from GD access model. Only
1189 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1190 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1191 can transit to different access model. */
1192 if ((offset + 10) > sec->size ||
1193 (type != 0x8d && type != 0x04))
1196 val = bfd_get_8 (abfd, contents + offset - 1);
1199 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1203 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1206 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1211 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1212 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1215 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1221 /* Check transition from LD access model. Only
1222 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1223 can transit to different access model. */
1224 if (type != 0x8d || (offset + 9) > sec->size)
1227 val = bfd_get_8 (abfd, contents + offset - 1);
1228 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1232 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1235 r_symndx = ELF32_R_SYM (rel[1].r_info);
1236 if (r_symndx < symtab_hdr->sh_info)
1239 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1240 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1241 may be versioned. */
1243 && h->root.root.string != NULL
1244 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1245 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1246 && (strncmp (h->root.root.string, "___tls_get_addr",
1250 /* Check transition from IE access model:
1251 movl foo@indntpoff(%rip), %eax
1252 movl foo@indntpoff(%rip), %reg
1253 addl foo@indntpoff(%rip), %reg
1256 if (offset < 1 || (offset + 4) > sec->size)
1259 /* Check "movl foo@tpoff(%rip), %eax" first. */
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1267 /* Check movl|addl foo@tpoff(%rip), %reg. */
1268 type = bfd_get_8 (abfd, contents + offset - 2);
1269 return ((type == 0x8b || type == 0x03)
1270 && (val & 0xc7) == 0x05);
1272 case R_386_TLS_GOTIE:
1273 case R_386_TLS_IE_32:
1274 /* Check transition from {IE_32,GOTIE} access model:
1275 subl foo@{tpoff,gontoff}(%reg1), %reg2
1276 movl foo@{tpoff,gontoff}(%reg1), %reg2
1277 addl foo@{tpoff,gontoff}(%reg1), %reg2
1280 if (offset < 2 || (offset + 4) > sec->size)
1283 val = bfd_get_8 (abfd, contents + offset - 1);
1284 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1287 type = bfd_get_8 (abfd, contents + offset - 2);
1288 return type == 0x8b || type == 0x2b || type == 0x03;
1290 case R_386_TLS_GOTDESC:
1291 /* Check transition from GDesc access model:
1292 leal x@tlsdesc(%ebx), %eax
1294 Make sure it's a leal adding ebx to a 32-bit offset
1295 into any register, although it's probably almost always
1298 if (offset < 2 || (offset + 4) > sec->size)
1301 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1304 val = bfd_get_8 (abfd, contents + offset - 1);
1305 return (val & 0xc7) == 0x83;
1307 case R_386_TLS_DESC_CALL:
1308 /* Check transition from GDesc access model:
1309 call *x@tlsdesc(%rax)
1311 if (offset + 2 <= sec->size)
1313 /* Make sure that it's a call *x@tlsdesc(%rax). */
1314 static const unsigned char call[] = { 0xff, 0x10 };
1315 return memcmp (contents + offset, call, 2) == 0;
1325 /* Return TRUE if the TLS access transition is OK or no transition
1326 will be performed. Update R_TYPE if there is a transition. */
1329 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1330 asection *sec, bfd_byte *contents,
1331 Elf_Internal_Shdr *symtab_hdr,
1332 struct elf_link_hash_entry **sym_hashes,
1333 unsigned int *r_type, int tls_type,
1334 const Elf_Internal_Rela *rel,
1335 const Elf_Internal_Rela *relend,
1336 struct elf_link_hash_entry *h,
1337 unsigned long r_symndx)
1339 unsigned int from_type = *r_type;
1340 unsigned int to_type = from_type;
1341 bfd_boolean check = TRUE;
1343 /* Skip TLS transition for functions. */
1345 && (h->type == STT_FUNC
1346 || h->type == STT_GNU_IFUNC))
1352 case R_386_TLS_GOTDESC:
1353 case R_386_TLS_DESC_CALL:
1354 case R_386_TLS_IE_32:
1356 case R_386_TLS_GOTIE:
1357 if (info->executable)
1360 to_type = R_386_TLS_LE_32;
1361 else if (from_type != R_386_TLS_IE
1362 && from_type != R_386_TLS_GOTIE)
1363 to_type = R_386_TLS_IE_32;
1366 /* When we are called from elf_i386_relocate_section, CONTENTS
1367 isn't NULL and there may be additional transitions based on
1369 if (contents != NULL)
1371 unsigned int new_to_type = to_type;
1373 if (info->executable
1376 && (tls_type & GOT_TLS_IE))
1377 new_to_type = R_386_TLS_LE_32;
1379 if (to_type == R_386_TLS_GD
1380 || to_type == R_386_TLS_GOTDESC
1381 || to_type == R_386_TLS_DESC_CALL)
1383 if (tls_type == GOT_TLS_IE_POS)
1384 new_to_type = R_386_TLS_GOTIE;
1385 else if (tls_type & GOT_TLS_IE)
1386 new_to_type = R_386_TLS_IE_32;
1389 /* We checked the transition before when we were called from
1390 elf_i386_check_relocs. We only want to check the new
1391 transition which hasn't been checked before. */
1392 check = new_to_type != to_type && from_type == to_type;
1393 to_type = new_to_type;
1399 if (info->executable)
1400 to_type = R_386_TLS_LE_32;
1407 /* Return TRUE if there is no transition. */
1408 if (from_type == to_type)
1411 /* Check if the transition can be performed. */
1413 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1414 symtab_hdr, sym_hashes,
1415 from_type, rel, relend))
1417 reloc_howto_type *from, *to;
1420 from = elf_i386_rtype_to_howto (abfd, from_type);
1421 to = elf_i386_rtype_to_howto (abfd, to_type);
1424 name = h->root.root.string;
1427 struct elf_i386_link_hash_table *htab;
1429 htab = elf_i386_hash_table (info);
1434 Elf_Internal_Sym *isym;
1436 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1438 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1442 (*_bfd_error_handler)
1443 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1444 "in section `%A' failed"),
1445 abfd, sec, from->name, to->name, name,
1446 (unsigned long) rel->r_offset);
1447 bfd_set_error (bfd_error_bad_value);
1455 /* Rename some of the generic section flags to better document how they
1457 #define need_convert_mov_to_lea sec_flg0
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1467 const Elf_Internal_Rela *relocs)
1469 struct elf_i386_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1475 bfd_boolean use_plt_got;
1477 if (info->relocatable)
1480 BFD_ASSERT (is_i386_elf (abfd));
1482 htab = elf_i386_hash_table (info);
1486 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1487 && (get_elf_i386_backend_data (abfd)
1488 == &elf_i386_arch_bed));
1490 symtab_hdr = &elf_symtab_hdr (abfd);
1491 sym_hashes = elf_sym_hashes (abfd);
1495 rel_end = relocs + sec->reloc_count;
1496 for (rel = relocs; rel < rel_end; rel++)
1498 unsigned int r_type;
1499 unsigned long r_symndx;
1500 struct elf_link_hash_entry *h;
1501 struct elf_i386_link_hash_entry *eh;
1502 Elf_Internal_Sym *isym;
1504 bfd_boolean size_reloc;
1506 r_symndx = ELF32_R_SYM (rel->r_info);
1507 r_type = ELF32_R_TYPE (rel->r_info);
1509 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1511 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1517 if (r_symndx < symtab_hdr->sh_info)
1519 /* A local symbol. */
1520 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1525 /* Check relocation against local STT_GNU_IFUNC symbol. */
1526 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1528 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1532 /* Fake a STT_GNU_IFUNC symbol. */
1533 h->type = STT_GNU_IFUNC;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1551 eh = (struct elf_i386_link_hash_entry *) h;
1554 /* Create the ifunc sections for static executables. If we
1555 never see an indirect function symbol nor we are building
1556 a static executable, those sections will be empty and
1557 won't appear in output. */
1569 if (htab->elf.dynobj == NULL)
1570 htab->elf.dynobj = abfd;
1571 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1576 /* It is referenced by a non-shared object. */
1578 h->root.non_ir_ref = 1;
1581 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1582 symtab_hdr, sym_hashes,
1583 &r_type, GOT_UNKNOWN,
1584 rel, rel_end, h, r_symndx))
1590 htab->tls_ldm_got.refcount += 1;
1594 /* This symbol requires a procedure linkage table entry. We
1595 actually build the entry in adjust_dynamic_symbol,
1596 because this might be a case of linking PIC code which is
1597 never referenced by a dynamic object, in which case we
1598 don't need to generate a procedure linkage table entry
1601 /* If this is a local symbol, we resolve it directly without
1602 creating a procedure linkage table entry. */
1607 h->plt.refcount += 1;
1614 case R_386_TLS_IE_32:
1616 case R_386_TLS_GOTIE:
1617 if (!info->executable)
1618 info->flags |= DF_STATIC_TLS;
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1627 int tls_type, old_tls_type;
1632 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1652 h->got.refcount += 1;
1653 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1657 bfd_signed_vma *local_got_refcounts;
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_i386_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_i386_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1678 local_got_refcounts[r_symndx] += 1;
1679 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1698 name = h->root.root.string;
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1702 (*_bfd_error_handler)
1703 (_("%B: `%s' accessed both as normal and "
1704 "thread local symbol"),
1706 bfd_set_error (bfd_error_bad_value);
1711 if (old_tls_type != tls_type)
1714 elf_i386_hash_entry (h)->tls_type = tls_type;
1716 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1724 if (htab->elf.sgot == NULL)
1726 if (htab->elf.dynobj == NULL)
1727 htab->elf.dynobj = abfd;
1728 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1731 if (r_type != R_386_TLS_IE)
1735 case R_386_TLS_LE_32:
1737 if (info->executable)
1739 info->flags |= DF_STATIC_TLS;
1744 if (h != NULL && info->executable)
1746 /* If this reloc is in a read-only section, we might
1747 need a copy reloc. We can't check reliably at this
1748 stage whether the section is read-only, as input
1749 sections have not yet been mapped to output sections.
1750 Tentatively set the flag for now, and correct in
1751 adjust_dynamic_symbol. */
1754 /* We may need a .plt entry if the function this reloc
1755 refers to is in a shared lib. */
1756 h->plt.refcount += 1;
1757 if (r_type != R_386_PC32)
1758 h->pointer_equality_needed = 1;
1763 /* If we are creating a shared library, and this is a reloc
1764 against a global symbol, or a non PC relative reloc
1765 against a local symbol, then we need to copy the reloc
1766 into the shared library. However, if we are linking with
1767 -Bsymbolic, we do not need to copy a reloc against a
1768 global symbol which is defined in an object we are
1769 including in the link (i.e., DEF_REGULAR is set). At
1770 this point we have not seen all the input files, so it is
1771 possible that DEF_REGULAR is not set now but will be set
1772 later (it is never cleared). In case of a weak definition,
1773 DEF_REGULAR may be cleared later by a strong definition in
1774 a shared library. We account for that possibility below by
1775 storing information in the relocs_copied field of the hash
1776 table entry. A similar situation occurs when creating
1777 shared libraries and symbol visibility changes render the
1780 If on the other hand, we are creating an executable, we
1781 may need to keep relocations for symbols satisfied by a
1782 dynamic library if we manage to avoid copy relocs for the
1785 && (sec->flags & SEC_ALLOC) != 0
1786 && (r_type != R_386_PC32
1788 && (! SYMBOLIC_BIND (info, h)
1789 || h->root.type == bfd_link_hash_defweak
1790 || !h->def_regular))))
1791 || (ELIMINATE_COPY_RELOCS
1793 && (sec->flags & SEC_ALLOC) != 0
1795 && (h->root.type == bfd_link_hash_defweak
1796 || !h->def_regular)))
1798 struct elf_dyn_relocs *p;
1799 struct elf_dyn_relocs **head;
1801 /* We must copy these reloc types into the output file.
1802 Create a reloc section in dynobj and make room for
1806 if (htab->elf.dynobj == NULL)
1807 htab->elf.dynobj = abfd;
1809 sreloc = _bfd_elf_make_dynamic_reloc_section
1810 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1816 /* If this is a global symbol, we count the number of
1817 relocations we need for this symbol. */
1820 head = &eh->dyn_relocs;
1824 /* Track dynamic relocs needed for local syms too.
1825 We really need local syms available to do this
1830 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1835 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1839 vpp = &elf_section_data (s)->local_dynrel;
1840 head = (struct elf_dyn_relocs **)vpp;
1844 if (p == NULL || p->sec != sec)
1846 bfd_size_type amt = sizeof *p;
1847 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1859 /* Count size relocation as PC-relative relocation. */
1860 if (r_type == R_386_PC32 || size_reloc)
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1887 && h->plt.refcount > 0
1888 && h->got.refcount > 0
1889 && htab->plt_got == NULL)
1891 /* Create the GOT procedure linkage table. */
1892 unsigned int plt_got_align;
1893 const struct elf_backend_data *bed;
1895 bed = get_elf_backend_data (info->output_bfd);
1896 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1897 && (sizeof (elf_i386_got_plt_entry)
1898 == sizeof (elf_i386_pic_got_plt_entry)));
1901 if (htab->elf.dynobj == NULL)
1902 htab->elf.dynobj = abfd;
1904 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1906 (bed->dynamic_sec_flags
1911 if (htab->plt_got == NULL
1912 || !bfd_set_section_alignment (htab->elf.dynobj,
1918 if (r_type == R_386_GOT32
1919 && (h == NULL || h->type != STT_GNU_IFUNC))
1920 sec->need_convert_mov_to_lea = 1;
1926 /* Return the section that should be marked against GC for a given
1930 elf_i386_gc_mark_hook (asection *sec,
1931 struct bfd_link_info *info,
1932 Elf_Internal_Rela *rel,
1933 struct elf_link_hash_entry *h,
1934 Elf_Internal_Sym *sym)
1937 switch (ELF32_R_TYPE (rel->r_info))
1939 case R_386_GNU_VTINHERIT:
1940 case R_386_GNU_VTENTRY:
1944 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1947 /* Update the got entry reference counts for the section being removed. */
1950 elf_i386_gc_sweep_hook (bfd *abfd,
1951 struct bfd_link_info *info,
1953 const Elf_Internal_Rela *relocs)
1955 struct elf_i386_link_hash_table *htab;
1956 Elf_Internal_Shdr *symtab_hdr;
1957 struct elf_link_hash_entry **sym_hashes;
1958 bfd_signed_vma *local_got_refcounts;
1959 const Elf_Internal_Rela *rel, *relend;
1961 if (info->relocatable)
1964 htab = elf_i386_hash_table (info);
1968 elf_section_data (sec)->local_dynrel = NULL;
1970 symtab_hdr = &elf_symtab_hdr (abfd);
1971 sym_hashes = elf_sym_hashes (abfd);
1972 local_got_refcounts = elf_local_got_refcounts (abfd);
1974 relend = relocs + sec->reloc_count;
1975 for (rel = relocs; rel < relend; rel++)
1977 unsigned long r_symndx;
1978 unsigned int r_type;
1979 struct elf_link_hash_entry *h = NULL;
1981 r_symndx = ELF32_R_SYM (rel->r_info);
1982 if (r_symndx >= symtab_hdr->sh_info)
1984 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1985 while (h->root.type == bfd_link_hash_indirect
1986 || h->root.type == bfd_link_hash_warning)
1987 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1991 /* A local symbol. */
1992 Elf_Internal_Sym *isym;
1994 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1997 /* Check relocation against local STT_GNU_IFUNC symbol. */
1999 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2001 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2009 struct elf_i386_link_hash_entry *eh;
2010 struct elf_dyn_relocs **pp;
2011 struct elf_dyn_relocs *p;
2013 eh = (struct elf_i386_link_hash_entry *) h;
2014 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2017 /* Everything must go for SEC. */
2023 r_type = ELF32_R_TYPE (rel->r_info);
2024 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2025 symtab_hdr, sym_hashes,
2026 &r_type, GOT_UNKNOWN,
2027 rel, relend, h, r_symndx))
2033 if (htab->tls_ldm_got.refcount > 0)
2034 htab->tls_ldm_got.refcount -= 1;
2038 case R_386_TLS_GOTDESC:
2039 case R_386_TLS_DESC_CALL:
2040 case R_386_TLS_IE_32:
2042 case R_386_TLS_GOTIE:
2046 if (h->got.refcount > 0)
2047 h->got.refcount -= 1;
2048 if (h->type == STT_GNU_IFUNC)
2050 if (h->plt.refcount > 0)
2051 h->plt.refcount -= 1;
2054 else if (local_got_refcounts != NULL)
2056 if (local_got_refcounts[r_symndx] > 0)
2057 local_got_refcounts[r_symndx] -= 1;
2065 && (h == NULL || h->type != STT_GNU_IFUNC))
2072 if (h->plt.refcount > 0)
2073 h->plt.refcount -= 1;
2078 if (h != NULL && h->type == STT_GNU_IFUNC)
2080 if (h->got.refcount > 0)
2081 h->got.refcount -= 1;
2082 if (h->plt.refcount > 0)
2083 h->plt.refcount -= 1;
2095 /* Adjust a symbol defined by a dynamic object and referenced by a
2096 regular object. The current definition is in some section of the
2097 dynamic object, but we're not including those sections. We have to
2098 change the definition to something the rest of the link can
2102 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2103 struct elf_link_hash_entry *h)
2105 struct elf_i386_link_hash_table *htab;
2107 struct elf_i386_link_hash_entry *eh;
2108 struct elf_dyn_relocs *p;
2110 /* STT_GNU_IFUNC symbol must go through PLT. */
2111 if (h->type == STT_GNU_IFUNC)
2113 /* All local STT_GNU_IFUNC references must be treate as local
2114 calls via local PLT. */
2116 && SYMBOL_CALLS_LOCAL (info, h))
2118 bfd_size_type pc_count = 0, count = 0;
2119 struct elf_dyn_relocs **pp;
2121 eh = (struct elf_i386_link_hash_entry *) h;
2122 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2124 pc_count += p->pc_count;
2125 p->count -= p->pc_count;
2134 if (pc_count || count)
2138 if (h->plt.refcount <= 0)
2139 h->plt.refcount = 1;
2141 h->plt.refcount += 1;
2145 if (h->plt.refcount <= 0)
2147 h->plt.offset = (bfd_vma) -1;
2153 /* If this is a function, put it in the procedure linkage table. We
2154 will fill in the contents of the procedure linkage table later,
2155 when we know the address of the .got section. */
2156 if (h->type == STT_FUNC
2159 if (h->plt.refcount <= 0
2160 || SYMBOL_CALLS_LOCAL (info, h)
2161 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2162 && h->root.type == bfd_link_hash_undefweak))
2164 /* This case can occur if we saw a PLT32 reloc in an input
2165 file, but the symbol was never referred to by a dynamic
2166 object, or if all references were garbage collected. In
2167 such a case, we don't actually need to build a procedure
2168 linkage table, and we can just do a PC32 reloc instead. */
2169 h->plt.offset = (bfd_vma) -1;
2176 /* It's possible that we incorrectly decided a .plt reloc was
2177 needed for an R_386_PC32 reloc to a non-function sym in
2178 check_relocs. We can't decide accurately between function and
2179 non-function syms in check-relocs; Objects loaded later in
2180 the link may change h->type. So fix it now. */
2181 h->plt.offset = (bfd_vma) -1;
2183 /* If this is a weak symbol, and there is a real definition, the
2184 processor independent code will have arranged for us to see the
2185 real definition first, and we can just use the same value. */
2186 if (h->u.weakdef != NULL)
2188 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2189 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2190 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2191 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2192 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2193 h->non_got_ref = h->u.weakdef->non_got_ref;
2197 /* This is a reference to a symbol defined by a dynamic object which
2198 is not a function. */
2200 /* If we are creating a shared library, we must presume that the
2201 only references to the symbol are via the global offset table.
2202 For such cases we need not do anything here; the relocations will
2203 be handled correctly by relocate_section. */
2204 if (!info->executable)
2207 /* If there are no references to this symbol that do not use the
2208 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2210 eh = (struct elf_i386_link_hash_entry *) h;
2211 if (!h->non_got_ref && !eh->gotoff_ref)
2214 /* If -z nocopyreloc was given, we won't generate them either. */
2215 if (info->nocopyreloc)
2221 htab = elf_i386_hash_table (info);
2225 /* If there aren't any dynamic relocs in read-only sections nor
2226 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2227 avoid the copy reloc. This doesn't work on VxWorks, where we can
2228 not have dynamic relocations (other than copy and jump slot
2229 relocations) in an executable. */
2230 if (ELIMINATE_COPY_RELOCS
2232 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2234 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2236 s = p->sec->output_section;
2237 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2248 /* We must allocate the symbol in our .dynbss section, which will
2249 become part of the .bss section of the executable. There will be
2250 an entry for this symbol in the .dynsym section. The dynamic
2251 object will contain position independent code, so all references
2252 from the dynamic object to this symbol will go through the global
2253 offset table. The dynamic linker will use the .dynsym entry to
2254 determine the address it must put in the global offset table, so
2255 both the dynamic object and the regular object will refer to the
2256 same memory location for the variable. */
2258 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2259 copy the initial value out of the dynamic object and into the
2260 runtime process image. */
2261 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2263 htab->srelbss->size += sizeof (Elf32_External_Rel);
2269 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2272 /* Allocate space in .plt, .got and associated reloc sections for
2276 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2278 struct bfd_link_info *info;
2279 struct elf_i386_link_hash_table *htab;
2280 struct elf_i386_link_hash_entry *eh;
2281 struct elf_dyn_relocs *p;
2282 unsigned plt_entry_size;
2284 if (h->root.type == bfd_link_hash_indirect)
2287 eh = (struct elf_i386_link_hash_entry *) h;
2289 info = (struct bfd_link_info *) inf;
2290 htab = elf_i386_hash_table (info);
2294 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2296 /* We can't use the GOT PLT if pointer equality is needed since
2297 finish_dynamic_symbol won't clear symbol value and the dynamic
2298 linker won't update the GOT slot. We will get into an infinite
2299 loop at run-time. */
2300 if (htab->plt_got != NULL
2301 && h->type != STT_GNU_IFUNC
2302 && !h->pointer_equality_needed
2303 && h->plt.refcount > 0
2304 && h->got.refcount > 0)
2306 /* Don't use the regular PLT if there are both GOT and GOTPLT
2308 h->plt.offset = (bfd_vma) -1;
2310 /* Use the GOT PLT. */
2311 eh->plt_got.refcount = 1;
2314 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2315 here if it is defined and referenced in a non-shared object. */
2316 if (h->type == STT_GNU_IFUNC
2318 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2321 else if (htab->elf.dynamic_sections_created
2322 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2324 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2326 /* Make sure this symbol is output as a dynamic symbol.
2327 Undefined weak syms won't yet be marked as dynamic. */
2328 if (h->dynindx == -1
2329 && !h->forced_local)
2331 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2336 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2338 asection *s = htab->elf.splt;
2339 asection *got_s = htab->plt_got;
2341 /* If this is the first .plt entry, make room for the special
2344 s->size = plt_entry_size;
2347 eh->plt_got.offset = got_s->size;
2349 h->plt.offset = s->size;
2351 /* If this symbol is not defined in a regular file, and we are
2352 not generating a shared library, then set the symbol to this
2353 location in the .plt. This is required to make function
2354 pointers compare as equal between the normal executable and
2355 the shared library. */
2361 /* We need to make a call to the entry of the GOT PLT
2362 instead of regular PLT entry. */
2363 h->root.u.def.section = got_s;
2364 h->root.u.def.value = eh->plt_got.offset;
2368 h->root.u.def.section = s;
2369 h->root.u.def.value = h->plt.offset;
2373 /* Make room for this entry. */
2375 got_s->size += sizeof (elf_i386_got_plt_entry);
2378 s->size += plt_entry_size;
2380 /* We also need to make an entry in the .got.plt section,
2381 which will be placed in the .got section by the linker
2383 htab->elf.sgotplt->size += 4;
2385 /* We also need to make an entry in the .rel.plt section. */
2386 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2387 htab->elf.srelplt->reloc_count++;
2390 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2393 /* VxWorks has a second set of relocations for each PLT entry
2394 in executables. They go in a separate relocation section,
2395 which is processed by the kernel loader. */
2397 /* There are two relocations for the initial PLT entry: an
2398 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2399 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2401 if (h->plt.offset == plt_entry_size)
2402 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2404 /* There are two extra relocations for each subsequent PLT entry:
2405 an R_386_32 relocation for the GOT entry, and an R_386_32
2406 relocation for the PLT entry. */
2408 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2413 h->plt.offset = (bfd_vma) -1;
2419 h->plt.offset = (bfd_vma) -1;
2423 eh->tlsdesc_got = (bfd_vma) -1;
2425 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2426 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2427 if (h->got.refcount > 0
2430 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2431 h->got.offset = (bfd_vma) -1;
2432 else if (h->got.refcount > 0)
2436 int tls_type = elf_i386_hash_entry(h)->tls_type;
2438 /* Make sure this symbol is output as a dynamic symbol.
2439 Undefined weak syms won't yet be marked as dynamic. */
2440 if (h->dynindx == -1
2441 && !h->forced_local)
2443 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2448 if (GOT_TLS_GDESC_P (tls_type))
2450 eh->tlsdesc_got = htab->elf.sgotplt->size
2451 - elf_i386_compute_jump_table_size (htab);
2452 htab->elf.sgotplt->size += 8;
2453 h->got.offset = (bfd_vma) -2;
2455 if (! GOT_TLS_GDESC_P (tls_type)
2456 || GOT_TLS_GD_P (tls_type))
2458 h->got.offset = s->size;
2460 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2461 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2464 dyn = htab->elf.dynamic_sections_created;
2465 /* R_386_TLS_IE_32 needs one dynamic relocation,
2466 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2467 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2468 need two), R_386_TLS_GD needs one if local symbol and two if
2470 if (tls_type == GOT_TLS_IE_BOTH)
2471 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2472 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2473 || (tls_type & GOT_TLS_IE))
2474 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2475 else if (GOT_TLS_GD_P (tls_type))
2476 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2477 else if (! GOT_TLS_GDESC_P (tls_type)
2478 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2479 || h->root.type != bfd_link_hash_undefweak)
2481 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2482 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2483 if (GOT_TLS_GDESC_P (tls_type))
2484 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2487 h->got.offset = (bfd_vma) -1;
2489 if (eh->dyn_relocs == NULL)
2492 /* In the shared -Bsymbolic case, discard space allocated for
2493 dynamic pc-relative relocs against symbols which turn out to be
2494 defined in regular objects. For the normal shared case, discard
2495 space for pc-relative relocs that have become local due to symbol
2496 visibility changes. */
2500 /* The only reloc that uses pc_count is R_386_PC32, which will
2501 appear on a call or on something like ".long foo - .". We
2502 want calls to protected symbols to resolve directly to the
2503 function rather than going via the plt. If people want
2504 function pointer comparisons to work as expected then they
2505 should avoid writing assembly like ".long foo - .". */
2506 if (SYMBOL_CALLS_LOCAL (info, h))
2508 struct elf_dyn_relocs **pp;
2510 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2512 p->count -= p->pc_count;
2521 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2523 struct elf_dyn_relocs **pp;
2524 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2526 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2533 /* Also discard relocs on undefined weak syms with non-default
2535 if (eh->dyn_relocs != NULL
2536 && h->root.type == bfd_link_hash_undefweak)
2538 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2539 eh->dyn_relocs = NULL;
2541 /* Make sure undefined weak symbols are output as a dynamic
2543 else if (h->dynindx == -1
2544 && !h->forced_local)
2546 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2551 else if (ELIMINATE_COPY_RELOCS)
2553 /* For the non-shared case, discard space for relocs against
2554 symbols which turn out to need copy relocs or are not
2560 || (htab->elf.dynamic_sections_created
2561 && (h->root.type == bfd_link_hash_undefweak
2562 || h->root.type == bfd_link_hash_undefined))))
2564 /* Make sure this symbol is output as a dynamic symbol.
2565 Undefined weak syms won't yet be marked as dynamic. */
2566 if (h->dynindx == -1
2567 && !h->forced_local)
2569 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2573 /* If that succeeded, we know we'll be keeping all the
2575 if (h->dynindx != -1)
2579 eh->dyn_relocs = NULL;
2584 /* Finally, allocate space. */
2585 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2589 sreloc = elf_section_data (p->sec)->sreloc;
2591 BFD_ASSERT (sreloc != NULL);
2592 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2598 /* Allocate space in .plt, .got and associated reloc sections for
2599 local dynamic relocs. */
2602 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2604 struct elf_link_hash_entry *h
2605 = (struct elf_link_hash_entry *) *slot;
2607 if (h->type != STT_GNU_IFUNC
2611 || h->root.type != bfd_link_hash_defined)
2614 return elf_i386_allocate_dynrelocs (h, inf);
2617 /* Find any dynamic relocs that apply to read-only sections. */
2620 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2622 struct elf_i386_link_hash_entry *eh;
2623 struct elf_dyn_relocs *p;
2625 /* Skip local IFUNC symbols. */
2626 if (h->forced_local && h->type == STT_GNU_IFUNC)
2629 eh = (struct elf_i386_link_hash_entry *) h;
2630 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2632 asection *s = p->sec->output_section;
2634 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2636 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2638 info->flags |= DF_TEXTREL;
2640 if ((info->warn_shared_textrel && info->shared)
2641 || info->error_textrel)
2642 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2643 p->sec->owner, h->root.root.string,
2646 /* Not an error, just cut short the traversal. */
2654 mov foo@GOT(%reg), %reg
2656 lea foo@GOTOFF(%reg), %reg
2657 with the local symbol, foo. */
2660 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2661 struct bfd_link_info *link_info)
2663 Elf_Internal_Shdr *symtab_hdr;
2664 Elf_Internal_Rela *internal_relocs;
2665 Elf_Internal_Rela *irel, *irelend;
2667 struct elf_i386_link_hash_table *htab;
2668 bfd_boolean changed_contents;
2669 bfd_boolean changed_relocs;
2670 bfd_signed_vma *local_got_refcounts;
2672 /* Don't even try to convert non-ELF outputs. */
2673 if (!is_elf_hash_table (link_info->hash))
2676 /* Nothing to do if there is no need or no output. */
2677 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2678 || sec->need_convert_mov_to_lea == 0
2679 || bfd_is_abs_section (sec->output_section))
2682 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2684 /* Load the relocations for this section. */
2685 internal_relocs = (_bfd_elf_link_read_relocs
2686 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2687 link_info->keep_memory));
2688 if (internal_relocs == NULL)
2691 htab = elf_i386_hash_table (link_info);
2692 changed_contents = FALSE;
2693 changed_relocs = FALSE;
2694 local_got_refcounts = elf_local_got_refcounts (abfd);
2696 /* Get the section contents. */
2697 if (elf_section_data (sec)->this_hdr.contents != NULL)
2698 contents = elf_section_data (sec)->this_hdr.contents;
2701 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2705 irelend = internal_relocs + sec->reloc_count;
2706 for (irel = internal_relocs; irel < irelend; irel++)
2708 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2709 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2711 struct elf_link_hash_entry *h;
2713 if (r_type != R_386_GOT32)
2716 /* Get the symbol referred to by the reloc. */
2717 if (r_symndx < symtab_hdr->sh_info)
2719 Elf_Internal_Sym *isym;
2721 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2724 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2725 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2726 && irel->r_offset >= 2
2727 && bfd_get_8 (input_bfd,
2728 contents + irel->r_offset - 2) == 0x8b)
2730 bfd_put_8 (output_bfd, 0x8d,
2731 contents + irel->r_offset - 2);
2732 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2733 if (local_got_refcounts != NULL
2734 && local_got_refcounts[r_symndx] > 0)
2735 local_got_refcounts[r_symndx] -= 1;
2736 changed_contents = TRUE;
2737 changed_relocs = TRUE;
2742 indx = r_symndx - symtab_hdr->sh_info;
2743 h = elf_sym_hashes (abfd)[indx];
2744 BFD_ASSERT (h != NULL);
2746 while (h->root.type == bfd_link_hash_indirect
2747 || h->root.type == bfd_link_hash_warning)
2748 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2750 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2751 optimizing _DYNAMIC since ld.so may use its link-time address. */
2753 && h->type != STT_GNU_IFUNC
2754 && h != htab->elf.hdynamic
2755 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2756 && irel->r_offset >= 2
2757 && bfd_get_8 (input_bfd,
2758 contents + irel->r_offset - 2) == 0x8b)
2760 bfd_put_8 (output_bfd, 0x8d,
2761 contents + irel->r_offset - 2);
2762 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2763 if (h->got.refcount > 0)
2764 h->got.refcount -= 1;
2765 changed_contents = TRUE;
2766 changed_relocs = TRUE;
2770 if (contents != NULL
2771 && elf_section_data (sec)->this_hdr.contents != contents)
2773 if (!changed_contents && !link_info->keep_memory)
2777 /* Cache the section contents for elf_link_input_bfd. */
2778 elf_section_data (sec)->this_hdr.contents = contents;
2782 if (elf_section_data (sec)->relocs != internal_relocs)
2784 if (!changed_relocs)
2785 free (internal_relocs);
2787 elf_section_data (sec)->relocs = internal_relocs;
2793 if (contents != NULL
2794 && elf_section_data (sec)->this_hdr.contents != contents)
2796 if (internal_relocs != NULL
2797 && elf_section_data (sec)->relocs != internal_relocs)
2798 free (internal_relocs);
2802 /* Set the sizes of the dynamic sections. */
2805 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2807 struct elf_i386_link_hash_table *htab;
2813 htab = elf_i386_hash_table (info);
2816 dynobj = htab->elf.dynobj;
2820 if (htab->elf.dynamic_sections_created)
2822 /* Set the contents of the .interp section to the interpreter. */
2823 if (info->executable)
2825 s = bfd_get_linker_section (dynobj, ".interp");
2828 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2829 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2833 /* Set up .got offsets for local syms, and space for local dynamic
2835 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2837 bfd_signed_vma *local_got;
2838 bfd_signed_vma *end_local_got;
2839 char *local_tls_type;
2840 bfd_vma *local_tlsdesc_gotent;
2841 bfd_size_type locsymcount;
2842 Elf_Internal_Shdr *symtab_hdr;
2845 if (! is_i386_elf (ibfd))
2848 for (s = ibfd->sections; s != NULL; s = s->next)
2850 struct elf_dyn_relocs *p;
2852 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2855 for (p = ((struct elf_dyn_relocs *)
2856 elf_section_data (s)->local_dynrel);
2860 if (!bfd_is_abs_section (p->sec)
2861 && bfd_is_abs_section (p->sec->output_section))
2863 /* Input section has been discarded, either because
2864 it is a copy of a linkonce section or due to
2865 linker script /DISCARD/, so we'll be discarding
2868 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2869 && strcmp (p->sec->output_section->name,
2872 /* Relocations in vxworks .tls_vars sections are
2873 handled specially by the loader. */
2875 else if (p->count != 0)
2877 srel = elf_section_data (p->sec)->sreloc;
2878 srel->size += p->count * sizeof (Elf32_External_Rel);
2879 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2880 && (info->flags & DF_TEXTREL) == 0)
2882 info->flags |= DF_TEXTREL;
2883 if ((info->warn_shared_textrel && info->shared)
2884 || info->error_textrel)
2885 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2886 p->sec->owner, p->sec);
2892 local_got = elf_local_got_refcounts (ibfd);
2896 symtab_hdr = &elf_symtab_hdr (ibfd);
2897 locsymcount = symtab_hdr->sh_info;
2898 end_local_got = local_got + locsymcount;
2899 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2900 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2902 srel = htab->elf.srelgot;
2903 for (; local_got < end_local_got;
2904 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2906 *local_tlsdesc_gotent = (bfd_vma) -1;
2909 if (GOT_TLS_GDESC_P (*local_tls_type))
2911 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2912 - elf_i386_compute_jump_table_size (htab);
2913 htab->elf.sgotplt->size += 8;
2914 *local_got = (bfd_vma) -2;
2916 if (! GOT_TLS_GDESC_P (*local_tls_type)
2917 || GOT_TLS_GD_P (*local_tls_type))
2919 *local_got = s->size;
2921 if (GOT_TLS_GD_P (*local_tls_type)
2922 || *local_tls_type == GOT_TLS_IE_BOTH)
2926 || GOT_TLS_GD_ANY_P (*local_tls_type)
2927 || (*local_tls_type & GOT_TLS_IE))
2929 if (*local_tls_type == GOT_TLS_IE_BOTH)
2930 srel->size += 2 * sizeof (Elf32_External_Rel);
2931 else if (GOT_TLS_GD_P (*local_tls_type)
2932 || ! GOT_TLS_GDESC_P (*local_tls_type))
2933 srel->size += sizeof (Elf32_External_Rel);
2934 if (GOT_TLS_GDESC_P (*local_tls_type))
2935 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2939 *local_got = (bfd_vma) -1;
2943 if (htab->tls_ldm_got.refcount > 0)
2945 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2947 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2948 htab->elf.sgot->size += 8;
2949 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2952 htab->tls_ldm_got.offset = -1;
2954 /* Allocate global sym .plt and .got entries, and space for global
2955 sym dynamic relocs. */
2956 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2958 /* Allocate .plt and .got entries, and space for local symbols. */
2959 htab_traverse (htab->loc_hash_table,
2960 elf_i386_allocate_local_dynrelocs,
2963 /* For every jump slot reserved in the sgotplt, reloc_count is
2964 incremented. However, when we reserve space for TLS descriptors,
2965 it's not incremented, so in order to compute the space reserved
2966 for them, it suffices to multiply the reloc count by the jump
2969 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2970 so that R_386_IRELATIVE entries come last. */
2971 if (htab->elf.srelplt)
2973 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2974 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2975 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2977 else if (htab->elf.irelplt)
2978 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2981 if (htab->elf.sgotplt)
2983 /* Don't allocate .got.plt section if there are no GOT nor PLT
2984 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2985 if ((htab->elf.hgot == NULL
2986 || !htab->elf.hgot->ref_regular_nonweak)
2987 && (htab->elf.sgotplt->size
2988 == get_elf_backend_data (output_bfd)->got_header_size)
2989 && (htab->elf.splt == NULL
2990 || htab->elf.splt->size == 0)
2991 && (htab->elf.sgot == NULL
2992 || htab->elf.sgot->size == 0)
2993 && (htab->elf.iplt == NULL
2994 || htab->elf.iplt->size == 0)
2995 && (htab->elf.igotplt == NULL
2996 || htab->elf.igotplt->size == 0))
2997 htab->elf.sgotplt->size = 0;
3001 if (htab->plt_eh_frame != NULL
3002 && htab->elf.splt != NULL
3003 && htab->elf.splt->size != 0
3004 && !bfd_is_abs_section (htab->elf.splt->output_section)
3005 && _bfd_elf_eh_frame_present (info))
3006 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3008 /* We now have determined the sizes of the various dynamic sections.
3009 Allocate memory for them. */
3011 for (s = dynobj->sections; s != NULL; s = s->next)
3013 bfd_boolean strip_section = TRUE;
3015 if ((s->flags & SEC_LINKER_CREATED) == 0)
3018 if (s == htab->elf.splt
3019 || s == htab->elf.sgot)
3021 /* Strip this section if we don't need it; see the
3023 /* We'd like to strip these sections if they aren't needed, but if
3024 we've exported dynamic symbols from them we must leave them.
3025 It's too late to tell BFD to get rid of the symbols. */
3027 if (htab->elf.hplt != NULL)
3028 strip_section = FALSE;
3030 else if (s == htab->elf.sgotplt
3031 || s == htab->elf.iplt
3032 || s == htab->elf.igotplt
3033 || s == htab->plt_got
3034 || s == htab->plt_eh_frame
3035 || s == htab->sdynbss)
3037 /* Strip these too. */
3039 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3042 && s != htab->elf.srelplt
3043 && s != htab->srelplt2)
3046 /* We use the reloc_count field as a counter if we need
3047 to copy relocs into the output file. */
3052 /* It's not one of our sections, so don't allocate space. */
3058 /* If we don't need this section, strip it from the
3059 output file. This is mostly to handle .rel.bss and
3060 .rel.plt. We must create both sections in
3061 create_dynamic_sections, because they must be created
3062 before the linker maps input sections to output
3063 sections. The linker does that before
3064 adjust_dynamic_symbol is called, and it is that
3065 function which decides whether anything needs to go
3066 into these sections. */
3068 s->flags |= SEC_EXCLUDE;
3072 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3075 /* Allocate memory for the section contents. We use bfd_zalloc
3076 here in case unused entries are not reclaimed before the
3077 section's contents are written out. This should not happen,
3078 but this way if it does, we get a R_386_NONE reloc instead
3080 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3081 if (s->contents == NULL)
3085 if (htab->plt_eh_frame != NULL
3086 && htab->plt_eh_frame->contents != NULL)
3088 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3089 sizeof (elf_i386_eh_frame_plt));
3090 bfd_put_32 (dynobj, htab->elf.splt->size,
3091 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3094 if (htab->elf.dynamic_sections_created)
3096 /* Add some entries to the .dynamic section. We fill in the
3097 values later, in elf_i386_finish_dynamic_sections, but we
3098 must add the entries now so that we get the correct size for
3099 the .dynamic section. The DT_DEBUG entry is filled in by the
3100 dynamic linker and used by the debugger. */
3101 #define add_dynamic_entry(TAG, VAL) \
3102 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3104 if (info->executable)
3106 if (!add_dynamic_entry (DT_DEBUG, 0))
3110 if (htab->elf.splt->size != 0)
3112 if (!add_dynamic_entry (DT_PLTGOT, 0)
3113 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3114 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3115 || !add_dynamic_entry (DT_JMPREL, 0))
3121 if (!add_dynamic_entry (DT_REL, 0)
3122 || !add_dynamic_entry (DT_RELSZ, 0)
3123 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3126 /* If any dynamic relocs apply to a read-only section,
3127 then we need a DT_TEXTREL entry. */
3128 if ((info->flags & DF_TEXTREL) == 0)
3129 elf_link_hash_traverse (&htab->elf,
3130 elf_i386_readonly_dynrelocs, info);
3132 if ((info->flags & DF_TEXTREL) != 0)
3134 if (!add_dynamic_entry (DT_TEXTREL, 0))
3138 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3139 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3142 #undef add_dynamic_entry
3148 elf_i386_always_size_sections (bfd *output_bfd,
3149 struct bfd_link_info *info)
3151 asection *tls_sec = elf_hash_table (info)->tls_sec;
3155 struct elf_link_hash_entry *tlsbase;
3157 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3158 "_TLS_MODULE_BASE_",
3159 FALSE, FALSE, FALSE);
3161 if (tlsbase && tlsbase->type == STT_TLS)
3163 struct elf_i386_link_hash_table *htab;
3164 struct bfd_link_hash_entry *bh = NULL;
3165 const struct elf_backend_data *bed
3166 = get_elf_backend_data (output_bfd);
3168 htab = elf_i386_hash_table (info);
3172 if (!(_bfd_generic_link_add_one_symbol
3173 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3174 tls_sec, 0, NULL, FALSE,
3175 bed->collect, &bh)))
3178 htab->tls_module_base = bh;
3180 tlsbase = (struct elf_link_hash_entry *)bh;
3181 tlsbase->def_regular = 1;
3182 tlsbase->other = STV_HIDDEN;
3183 tlsbase->root.linker_def = 1;
3184 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3191 /* Set the correct type for an x86 ELF section. We do this by the
3192 section name, which is a hack, but ought to work. */
3195 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3196 Elf_Internal_Shdr *hdr,
3201 name = bfd_get_section_name (abfd, sec);
3203 /* This is an ugly, but unfortunately necessary hack that is
3204 needed when producing EFI binaries on x86. It tells
3205 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3206 containing ELF relocation info. We need this hack in order to
3207 be able to generate ELF binaries that can be translated into
3208 EFI applications (which are essentially COFF objects). Those
3209 files contain a COFF ".reloc" section inside an ELFNN object,
3210 which would normally cause BFD to segfault because it would
3211 attempt to interpret this section as containing relocation
3212 entries for section "oc". With this hack enabled, ".reloc"
3213 will be treated as a normal data section, which will avoid the
3214 segfault. However, you won't be able to create an ELFNN binary
3215 with a section named "oc" that needs relocations, but that's
3216 the kind of ugly side-effects you get when detecting section
3217 types based on their names... In practice, this limitation is
3218 unlikely to bite. */
3219 if (strcmp (name, ".reloc") == 0)
3220 hdr->sh_type = SHT_PROGBITS;
3225 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3226 executables. Rather than setting it to the beginning of the TLS
3227 section, we have to set it to the end. This function may be called
3228 multiple times, it is idempotent. */
3231 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3233 struct elf_i386_link_hash_table *htab;
3234 struct bfd_link_hash_entry *base;
3236 if (!info->executable)
3239 htab = elf_i386_hash_table (info);
3243 base = htab->tls_module_base;
3247 base->u.def.value = htab->elf.tls_size;
3250 /* Return the base VMA address which should be subtracted from real addresses
3251 when resolving @dtpoff relocation.
3252 This is PT_TLS segment p_vaddr. */
3255 elf_i386_dtpoff_base (struct bfd_link_info *info)
3257 /* If tls_sec is NULL, we should have signalled an error already. */
3258 if (elf_hash_table (info)->tls_sec == NULL)
3260 return elf_hash_table (info)->tls_sec->vma;
3263 /* Return the relocation value for @tpoff relocation
3264 if STT_TLS virtual address is ADDRESS. */
3267 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3269 struct elf_link_hash_table *htab = elf_hash_table (info);
3270 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3271 bfd_vma static_tls_size;
3273 /* If tls_sec is NULL, we should have signalled an error already. */
3274 if (htab->tls_sec == NULL)
3277 /* Consider special static TLS alignment requirements. */
3278 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3279 return static_tls_size + htab->tls_sec->vma - address;
3282 /* Relocate an i386 ELF section. */
3285 elf_i386_relocate_section (bfd *output_bfd,
3286 struct bfd_link_info *info,
3288 asection *input_section,
3290 Elf_Internal_Rela *relocs,
3291 Elf_Internal_Sym *local_syms,
3292 asection **local_sections)
3294 struct elf_i386_link_hash_table *htab;
3295 Elf_Internal_Shdr *symtab_hdr;
3296 struct elf_link_hash_entry **sym_hashes;
3297 bfd_vma *local_got_offsets;
3298 bfd_vma *local_tlsdesc_gotents;
3299 Elf_Internal_Rela *rel;
3300 Elf_Internal_Rela *relend;
3301 bfd_boolean is_vxworks_tls;
3302 unsigned plt_entry_size;
3304 BFD_ASSERT (is_i386_elf (input_bfd));
3306 htab = elf_i386_hash_table (info);
3309 symtab_hdr = &elf_symtab_hdr (input_bfd);
3310 sym_hashes = elf_sym_hashes (input_bfd);
3311 local_got_offsets = elf_local_got_offsets (input_bfd);
3312 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3313 /* We have to handle relocations in vxworks .tls_vars sections
3314 specially, because the dynamic loader is 'weird'. */
3315 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3317 && !strcmp (input_section->output_section->name,
3320 elf_i386_set_tls_module_base (info);
3322 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3325 relend = relocs + input_section->reloc_count;
3326 for (; rel < relend; rel++)
3328 unsigned int r_type;
3329 reloc_howto_type *howto;
3330 unsigned long r_symndx;
3331 struct elf_link_hash_entry *h;
3332 struct elf_i386_link_hash_entry *eh;
3333 Elf_Internal_Sym *sym;
3335 bfd_vma off, offplt, plt_offset;
3337 bfd_boolean unresolved_reloc;
3338 bfd_reloc_status_type r;
3342 asection *resolved_plt;
3344 r_type = ELF32_R_TYPE (rel->r_info);
3345 if (r_type == R_386_GNU_VTINHERIT
3346 || r_type == R_386_GNU_VTENTRY)
3349 if ((indx = r_type) >= R_386_standard
3350 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3351 >= R_386_ext - R_386_standard)
3352 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3353 >= R_386_irelative - R_386_ext))
3355 (*_bfd_error_handler)
3356 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3357 input_bfd, input_section, r_type);
3358 bfd_set_error (bfd_error_bad_value);
3361 howto = elf_howto_table + indx;
3363 r_symndx = ELF32_R_SYM (rel->r_info);
3367 unresolved_reloc = FALSE;
3368 if (r_symndx < symtab_hdr->sh_info)
3370 sym = local_syms + r_symndx;
3371 sec = local_sections[r_symndx];
3372 relocation = (sec->output_section->vma
3373 + sec->output_offset
3375 st_size = sym->st_size;
3377 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3378 && ((sec->flags & SEC_MERGE) != 0
3379 || (info->relocatable
3380 && sec->output_offset != 0)))
3383 bfd_byte *where = contents + rel->r_offset;
3385 switch (howto->size)
3388 addend = bfd_get_8 (input_bfd, where);
3389 if (howto->pc_relative)
3391 addend = (addend ^ 0x80) - 0x80;
3396 addend = bfd_get_16 (input_bfd, where);
3397 if (howto->pc_relative)
3399 addend = (addend ^ 0x8000) - 0x8000;
3404 addend = bfd_get_32 (input_bfd, where);
3405 if (howto->pc_relative)
3407 addend = (addend ^ 0x80000000) - 0x80000000;
3415 if (info->relocatable)
3416 addend += sec->output_offset;
3419 asection *msec = sec;
3420 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3422 addend -= relocation;
3423 addend += msec->output_section->vma + msec->output_offset;
3426 switch (howto->size)
3429 /* FIXME: overflow checks. */
3430 if (howto->pc_relative)
3432 bfd_put_8 (input_bfd, addend, where);
3435 if (howto->pc_relative)
3437 bfd_put_16 (input_bfd, addend, where);
3440 if (howto->pc_relative)
3442 bfd_put_32 (input_bfd, addend, where);
3446 else if (!info->relocatable
3447 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3449 /* Relocate against local STT_GNU_IFUNC symbol. */
3450 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3455 /* Set STT_GNU_IFUNC symbol value. */
3456 h->root.u.def.value = sym->st_value;
3457 h->root.u.def.section = sec;
3462 bfd_boolean warned ATTRIBUTE_UNUSED;
3463 bfd_boolean ignored ATTRIBUTE_UNUSED;
3465 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3466 r_symndx, symtab_hdr, sym_hashes,
3468 unresolved_reloc, warned, ignored);
3472 if (sec != NULL && discarded_section (sec))
3473 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3474 rel, 1, relend, howto, 0, contents);
3476 if (info->relocatable)
3479 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3480 it here if it is defined in a non-shared object. */
3482 && h->type == STT_GNU_IFUNC
3485 asection *plt, *gotplt, *base_got;
3489 if ((input_section->flags & SEC_ALLOC) == 0
3490 || h->plt.offset == (bfd_vma) -1)
3493 /* STT_GNU_IFUNC symbol must go through PLT. */
3494 if (htab->elf.splt != NULL)
3496 plt = htab->elf.splt;
3497 gotplt = htab->elf.sgotplt;
3501 plt = htab->elf.iplt;
3502 gotplt = htab->elf.igotplt;
3505 relocation = (plt->output_section->vma
3506 + plt->output_offset + h->plt.offset);
3511 if (h->root.root.string)
3512 name = h->root.root.string;
3514 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3516 (*_bfd_error_handler)
3517 (_("%B: relocation %s against STT_GNU_IFUNC "
3518 "symbol `%s' isn't handled by %s"), input_bfd,
3519 elf_howto_table[r_type].name,
3520 name, __FUNCTION__);
3521 bfd_set_error (bfd_error_bad_value);
3525 /* Generate dynamic relcoation only when there is a
3526 non-GOT reference in a shared object. */
3527 if (info->shared && h->non_got_ref)
3529 Elf_Internal_Rela outrel;
3533 /* Need a dynamic relocation to get the real function
3535 offset = _bfd_elf_section_offset (output_bfd,
3539 if (offset == (bfd_vma) -1
3540 || offset == (bfd_vma) -2)
3543 outrel.r_offset = (input_section->output_section->vma
3544 + input_section->output_offset
3547 if (h->dynindx == -1
3549 || info->executable)
3551 /* This symbol is resolved locally. */
3552 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3553 bfd_put_32 (output_bfd,
3554 (h->root.u.def.value
3555 + h->root.u.def.section->output_section->vma
3556 + h->root.u.def.section->output_offset),
3560 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3562 sreloc = htab->elf.irelifunc;
3563 elf_append_rel (output_bfd, sreloc, &outrel);
3565 /* If this reloc is against an external symbol, we
3566 do not want to fiddle with the addend. Otherwise,
3567 we need to include the symbol value so that it
3568 becomes an addend for the dynamic reloc. For an
3569 internal symbol, we have updated addend. */
3578 base_got = htab->elf.sgot;
3579 off = h->got.offset;
3581 if (base_got == NULL)
3584 if (off == (bfd_vma) -1)
3586 /* We can't use h->got.offset here to save state, or
3587 even just remember the offset, as finish_dynamic_symbol
3588 would use that as offset into .got. */
3590 if (htab->elf.splt != NULL)
3592 plt_index = h->plt.offset / plt_entry_size - 1;
3593 off = (plt_index + 3) * 4;
3594 base_got = htab->elf.sgotplt;
3598 plt_index = h->plt.offset / plt_entry_size;
3599 off = plt_index * 4;
3600 base_got = htab->elf.igotplt;
3603 if (h->dynindx == -1
3607 /* This references the local defitionion. We must
3608 initialize this entry in the global offset table.
3609 Since the offset must always be a multiple of 8,
3610 we use the least significant bit to record
3611 whether we have initialized it already.
3613 When doing a dynamic link, we create a .rela.got
3614 relocation entry to initialize the value. This
3615 is done in the finish_dynamic_symbol routine. */
3620 bfd_put_32 (output_bfd, relocation,
3621 base_got->contents + off);
3628 /* Adjust for static executables. */
3629 if (htab->elf.splt == NULL)
3630 relocation += gotplt->output_offset;
3634 relocation = (base_got->output_section->vma
3635 + base_got->output_offset + off
3636 - gotplt->output_section->vma
3637 - gotplt->output_offset);
3638 /* Adjust for static executables. */
3639 if (htab->elf.splt == NULL)
3640 relocation += gotplt->output_offset;
3646 relocation -= (gotplt->output_section->vma
3647 + gotplt->output_offset);
3655 /* Relocation is to the entry for this symbol in the global
3657 if (htab->elf.sgot == NULL)
3664 off = h->got.offset;
3665 dyn = htab->elf.dynamic_sections_created;
3666 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3668 && SYMBOL_REFERENCES_LOCAL (info, h))
3669 || (ELF_ST_VISIBILITY (h->other)
3670 && h->root.type == bfd_link_hash_undefweak))
3672 /* This is actually a static link, or it is a
3673 -Bsymbolic link and the symbol is defined
3674 locally, or the symbol was forced to be local
3675 because of a version file. We must initialize
3676 this entry in the global offset table. Since the
3677 offset must always be a multiple of 4, we use the
3678 least significant bit to record whether we have
3679 initialized it already.
3681 When doing a dynamic link, we create a .rel.got
3682 relocation entry to initialize the value. This
3683 is done in the finish_dynamic_symbol routine. */
3688 bfd_put_32 (output_bfd, relocation,
3689 htab->elf.sgot->contents + off);
3694 unresolved_reloc = FALSE;
3698 if (local_got_offsets == NULL)
3701 off = local_got_offsets[r_symndx];
3703 /* The offset must always be a multiple of 4. We use
3704 the least significant bit to record whether we have
3705 already generated the necessary reloc. */
3710 bfd_put_32 (output_bfd, relocation,
3711 htab->elf.sgot->contents + off);
3716 Elf_Internal_Rela outrel;
3718 s = htab->elf.srelgot;
3722 outrel.r_offset = (htab->elf.sgot->output_section->vma
3723 + htab->elf.sgot->output_offset
3725 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3726 elf_append_rel (output_bfd, s, &outrel);
3729 local_got_offsets[r_symndx] |= 1;
3733 if (off >= (bfd_vma) -2)
3736 relocation = htab->elf.sgot->output_section->vma
3737 + htab->elf.sgot->output_offset + off
3738 - htab->elf.sgotplt->output_section->vma
3739 - htab->elf.sgotplt->output_offset;
3743 /* Relocation is relative to the start of the global offset
3746 /* Check to make sure it isn't a protected function or data
3747 symbol for shared library since it may not be local when
3748 used as function address or with copy relocation. We also
3749 need to make sure that a symbol is referenced locally. */
3750 if (!info->executable && h)
3752 if (!h->def_regular)
3756 switch (ELF_ST_VISIBILITY (h->other))
3759 v = _("hidden symbol");
3762 v = _("internal symbol");
3765 v = _("protected symbol");
3772 (*_bfd_error_handler)
3773 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3774 input_bfd, v, h->root.root.string);
3775 bfd_set_error (bfd_error_bad_value);
3778 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3779 && (h->type == STT_FUNC
3780 || h->type == STT_OBJECT)
3781 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3783 (*_bfd_error_handler)
3784 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3786 h->type == STT_FUNC ? "function" : "data",
3787 h->root.root.string);
3788 bfd_set_error (bfd_error_bad_value);
3793 /* Note that sgot is not involved in this
3794 calculation. We always want the start of .got.plt. If we
3795 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3796 permitted by the ABI, we might have to change this
3798 relocation -= htab->elf.sgotplt->output_section->vma
3799 + htab->elf.sgotplt->output_offset;
3803 /* Use global offset table as symbol value. */
3804 relocation = htab->elf.sgotplt->output_section->vma
3805 + htab->elf.sgotplt->output_offset;
3806 unresolved_reloc = FALSE;
3810 /* Relocation is to the entry for this symbol in the
3811 procedure linkage table. */
3813 /* Resolve a PLT32 reloc against a local symbol directly,
3814 without using the procedure linkage table. */
3818 eh = (struct elf_i386_link_hash_entry *) h;
3819 if ((h->plt.offset == (bfd_vma) -1
3820 && eh->plt_got.offset == (bfd_vma) -1)
3821 || htab->elf.splt == NULL)
3823 /* We didn't make a PLT entry for this symbol. This
3824 happens when statically linking PIC code, or when
3825 using -Bsymbolic. */
3829 if (h->plt.offset != (bfd_vma) -1)
3831 resolved_plt = htab->elf.splt;
3832 plt_offset = h->plt.offset;
3836 resolved_plt = htab->plt_got;
3837 plt_offset = eh->plt_got.offset;
3840 relocation = (resolved_plt->output_section->vma
3841 + resolved_plt->output_offset
3843 unresolved_reloc = FALSE;
3847 /* Set to symbol size. */
3848 relocation = st_size;
3853 if ((input_section->flags & SEC_ALLOC) == 0
3859 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3860 || h->root.type != bfd_link_hash_undefweak)
3861 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3862 || !SYMBOL_CALLS_LOCAL (info, h)))
3863 || (ELIMINATE_COPY_RELOCS
3870 || h->root.type == bfd_link_hash_undefweak
3871 || h->root.type == bfd_link_hash_undefined)))
3873 Elf_Internal_Rela outrel;
3874 bfd_boolean skip, relocate;
3877 /* When generating a shared object, these relocations
3878 are copied into the output file to be resolved at run
3885 _bfd_elf_section_offset (output_bfd, info, input_section,
3887 if (outrel.r_offset == (bfd_vma) -1)
3889 else if (outrel.r_offset == (bfd_vma) -2)
3890 skip = TRUE, relocate = TRUE;
3891 outrel.r_offset += (input_section->output_section->vma
3892 + input_section->output_offset);
3895 memset (&outrel, 0, sizeof outrel);
3898 && (r_type == R_386_PC32
3900 || !SYMBOLIC_BIND (info, h)
3901 || !h->def_regular))
3902 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3905 /* This symbol is local, or marked to become local. */
3907 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3910 sreloc = elf_section_data (input_section)->sreloc;
3912 if (sreloc == NULL || sreloc->contents == NULL)
3914 r = bfd_reloc_notsupported;
3915 goto check_relocation_error;
3918 elf_append_rel (output_bfd, sreloc, &outrel);
3920 /* If this reloc is against an external symbol, we do
3921 not want to fiddle with the addend. Otherwise, we
3922 need to include the symbol value so that it becomes
3923 an addend for the dynamic reloc. */
3930 if (!info->executable)
3932 Elf_Internal_Rela outrel;
3935 outrel.r_offset = rel->r_offset
3936 + input_section->output_section->vma
3937 + input_section->output_offset;
3938 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3939 sreloc = elf_section_data (input_section)->sreloc;
3942 elf_append_rel (output_bfd, sreloc, &outrel);
3947 case R_386_TLS_GOTDESC:
3948 case R_386_TLS_DESC_CALL:
3949 case R_386_TLS_IE_32:
3950 case R_386_TLS_GOTIE:
3951 tls_type = GOT_UNKNOWN;
3952 if (h == NULL && local_got_offsets)
3953 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3955 tls_type = elf_i386_hash_entry(h)->tls_type;
3956 if (tls_type == GOT_TLS_IE)
3957 tls_type = GOT_TLS_IE_NEG;
3959 if (! elf_i386_tls_transition (info, input_bfd,
3960 input_section, contents,
3961 symtab_hdr, sym_hashes,
3962 &r_type, tls_type, rel,
3963 relend, h, r_symndx))
3966 if (r_type == R_386_TLS_LE_32)
3968 BFD_ASSERT (! unresolved_reloc);
3969 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3974 /* GD->LE transition. */
3975 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3978 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3980 movl %gs:0, %eax; subl $foo@tpoff, %eax
3981 (6 byte form of subl). */
3982 memcpy (contents + rel->r_offset - 3,
3983 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3984 roff = rel->r_offset + 5;
3988 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3990 movl %gs:0, %eax; subl $foo@tpoff, %eax
3991 (6 byte form of subl). */
3992 memcpy (contents + rel->r_offset - 2,
3993 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3994 roff = rel->r_offset + 6;
3996 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3998 /* Skip R_386_PC32/R_386_PLT32. */
4002 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4004 /* GDesc -> LE transition.
4005 It's originally something like:
4006 leal x@tlsdesc(%ebx), %eax
4010 Registers other than %eax may be set up here. */
4015 roff = rel->r_offset;
4016 val = bfd_get_8 (input_bfd, contents + roff - 1);
4018 /* Now modify the instruction as appropriate. */
4019 /* aoliva FIXME: remove the above and xor the byte
4021 bfd_put_8 (output_bfd, val ^ 0x86,
4022 contents + roff - 1);
4023 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4027 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4029 /* GDesc -> LE transition.
4037 roff = rel->r_offset;
4038 bfd_put_8 (output_bfd, 0x66, contents + roff);
4039 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4042 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4046 /* IE->LE transition:
4047 Originally it can be one of:
4055 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4058 /* movl foo, %eax. */
4059 bfd_put_8 (output_bfd, 0xb8,
4060 contents + rel->r_offset - 1);
4066 type = bfd_get_8 (input_bfd,
4067 contents + rel->r_offset - 2);
4072 bfd_put_8 (output_bfd, 0xc7,
4073 contents + rel->r_offset - 2);
4074 bfd_put_8 (output_bfd,
4075 0xc0 | ((val >> 3) & 7),
4076 contents + rel->r_offset - 1);
4080 bfd_put_8 (output_bfd, 0x81,
4081 contents + rel->r_offset - 2);
4082 bfd_put_8 (output_bfd,
4083 0xc0 | ((val >> 3) & 7),
4084 contents + rel->r_offset - 1);
4091 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4092 contents + rel->r_offset);
4097 unsigned int val, type;
4099 /* {IE_32,GOTIE}->LE transition:
4100 Originally it can be one of:
4101 subl foo(%reg1), %reg2
4102 movl foo(%reg1), %reg2
4103 addl foo(%reg1), %reg2
4106 movl $foo, %reg2 (6 byte form)
4107 addl $foo, %reg2. */
4108 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4109 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4113 bfd_put_8 (output_bfd, 0xc7,
4114 contents + rel->r_offset - 2);
4115 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4116 contents + rel->r_offset - 1);
4118 else if (type == 0x2b)
4121 bfd_put_8 (output_bfd, 0x81,
4122 contents + rel->r_offset - 2);
4123 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4124 contents + rel->r_offset - 1);
4126 else if (type == 0x03)
4129 bfd_put_8 (output_bfd, 0x81,
4130 contents + rel->r_offset - 2);
4131 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4132 contents + rel->r_offset - 1);
4136 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4137 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4138 contents + rel->r_offset);
4140 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4141 contents + rel->r_offset);
4146 if (htab->elf.sgot == NULL)
4151 off = h->got.offset;
4152 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4156 if (local_got_offsets == NULL)
4159 off = local_got_offsets[r_symndx];
4160 offplt = local_tlsdesc_gotents[r_symndx];
4167 Elf_Internal_Rela outrel;
4171 if (htab->elf.srelgot == NULL)
4174 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4176 if (GOT_TLS_GDESC_P (tls_type))
4179 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4180 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4181 <= htab->elf.sgotplt->size);
4182 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4183 + htab->elf.sgotplt->output_offset
4185 + htab->sgotplt_jump_table_size);
4186 sreloc = htab->elf.srelplt;
4187 loc = sreloc->contents;
4188 loc += (htab->next_tls_desc_index++
4189 * sizeof (Elf32_External_Rel));
4190 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4191 <= sreloc->contents + sreloc->size);
4192 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4195 BFD_ASSERT (! unresolved_reloc);
4196 bfd_put_32 (output_bfd,
4197 relocation - elf_i386_dtpoff_base (info),
4198 htab->elf.sgotplt->contents + offplt
4199 + htab->sgotplt_jump_table_size + 4);
4203 bfd_put_32 (output_bfd, 0,
4204 htab->elf.sgotplt->contents + offplt
4205 + htab->sgotplt_jump_table_size + 4);
4209 sreloc = htab->elf.srelgot;
4211 outrel.r_offset = (htab->elf.sgot->output_section->vma
4212 + htab->elf.sgot->output_offset + off);
4214 if (GOT_TLS_GD_P (tls_type))
4215 dr_type = R_386_TLS_DTPMOD32;
4216 else if (GOT_TLS_GDESC_P (tls_type))
4218 else if (tls_type == GOT_TLS_IE_POS)
4219 dr_type = R_386_TLS_TPOFF;
4221 dr_type = R_386_TLS_TPOFF32;
4223 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4224 bfd_put_32 (output_bfd,
4225 relocation - elf_i386_dtpoff_base (info),
4226 htab->elf.sgot->contents + off);
4227 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4228 bfd_put_32 (output_bfd,
4229 elf_i386_dtpoff_base (info) - relocation,
4230 htab->elf.sgot->contents + off);
4231 else if (dr_type != R_386_TLS_DESC)
4232 bfd_put_32 (output_bfd, 0,
4233 htab->elf.sgot->contents + off);
4234 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4236 elf_append_rel (output_bfd, sreloc, &outrel);
4238 if (GOT_TLS_GD_P (tls_type))
4242 BFD_ASSERT (! unresolved_reloc);
4243 bfd_put_32 (output_bfd,
4244 relocation - elf_i386_dtpoff_base (info),
4245 htab->elf.sgot->contents + off + 4);
4249 bfd_put_32 (output_bfd, 0,
4250 htab->elf.sgot->contents + off + 4);
4251 outrel.r_info = ELF32_R_INFO (indx,
4252 R_386_TLS_DTPOFF32);
4253 outrel.r_offset += 4;
4254 elf_append_rel (output_bfd, sreloc, &outrel);
4257 else if (tls_type == GOT_TLS_IE_BOTH)
4259 bfd_put_32 (output_bfd,
4261 ? relocation - elf_i386_dtpoff_base (info)
4263 htab->elf.sgot->contents + off + 4);
4264 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4265 outrel.r_offset += 4;
4266 elf_append_rel (output_bfd, sreloc, &outrel);
4273 local_got_offsets[r_symndx] |= 1;
4276 if (off >= (bfd_vma) -2
4277 && ! GOT_TLS_GDESC_P (tls_type))
4279 if (r_type == R_386_TLS_GOTDESC
4280 || r_type == R_386_TLS_DESC_CALL)
4282 relocation = htab->sgotplt_jump_table_size + offplt;
4283 unresolved_reloc = FALSE;
4285 else if (r_type == ELF32_R_TYPE (rel->r_info))
4287 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4288 + htab->elf.sgotplt->output_offset;
4289 relocation = htab->elf.sgot->output_section->vma
4290 + htab->elf.sgot->output_offset + off - g_o_t;
4291 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4292 && tls_type == GOT_TLS_IE_BOTH)
4294 if (r_type == R_386_TLS_IE)
4295 relocation += g_o_t;
4296 unresolved_reloc = FALSE;
4298 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4300 unsigned int val, type;
4303 /* GD->IE transition. */
4304 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4305 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4308 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4310 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4312 roff = rel->r_offset - 3;
4316 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4318 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4319 roff = rel->r_offset - 2;
4321 memcpy (contents + roff,
4322 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4323 contents[roff + 7] = 0x80 | (val & 7);
4324 /* If foo is used only with foo@gotntpoff(%reg) and
4325 foo@indntpoff, but not with foo@gottpoff(%reg), change
4326 subl $foo@gottpoff(%reg), %eax
4328 addl $foo@gotntpoff(%reg), %eax. */
4329 if (tls_type == GOT_TLS_IE_POS)
4330 contents[roff + 6] = 0x03;
4331 bfd_put_32 (output_bfd,
4332 htab->elf.sgot->output_section->vma
4333 + htab->elf.sgot->output_offset + off
4334 - htab->elf.sgotplt->output_section->vma
4335 - htab->elf.sgotplt->output_offset,
4336 contents + roff + 8);
4337 /* Skip R_386_PLT32. */
4341 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4343 /* GDesc -> IE transition.
4344 It's originally something like:
4345 leal x@tlsdesc(%ebx), %eax
4348 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4350 movl x@gottpoff(%ebx), %eax # before negl %eax
4352 Registers other than %eax may be set up here. */
4356 /* First, make sure it's a leal adding ebx to a 32-bit
4357 offset into any register, although it's probably
4358 almost always going to be eax. */
4359 roff = rel->r_offset;
4361 /* Now modify the instruction as appropriate. */
4362 /* To turn a leal into a movl in the form we use it, it
4363 suffices to change the first byte from 0x8d to 0x8b.
4364 aoliva FIXME: should we decide to keep the leal, all
4365 we have to do is remove the statement below, and
4366 adjust the relaxation of R_386_TLS_DESC_CALL. */
4367 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4369 if (tls_type == GOT_TLS_IE_BOTH)
4372 bfd_put_32 (output_bfd,
4373 htab->elf.sgot->output_section->vma
4374 + htab->elf.sgot->output_offset + off
4375 - htab->elf.sgotplt->output_section->vma
4376 - htab->elf.sgotplt->output_offset,
4380 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4382 /* GDesc -> IE transition.
4390 depending on how we transformed the TLS_GOTDESC above.
4395 roff = rel->r_offset;
4397 /* Now modify the instruction as appropriate. */
4398 if (tls_type != GOT_TLS_IE_NEG)
4401 bfd_put_8 (output_bfd, 0x66, contents + roff);
4402 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4407 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4408 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4418 if (! elf_i386_tls_transition (info, input_bfd,
4419 input_section, contents,
4420 symtab_hdr, sym_hashes,
4421 &r_type, GOT_UNKNOWN, rel,
4422 relend, h, r_symndx))
4425 if (r_type != R_386_TLS_LDM)
4427 /* LD->LE transition:
4428 leal foo(%reg), %eax; call ___tls_get_addr.
4430 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4431 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4432 memcpy (contents + rel->r_offset - 2,
4433 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4434 /* Skip R_386_PC32/R_386_PLT32. */
4439 if (htab->elf.sgot == NULL)
4442 off = htab->tls_ldm_got.offset;
4447 Elf_Internal_Rela outrel;
4449 if (htab->elf.srelgot == NULL)
4452 outrel.r_offset = (htab->elf.sgot->output_section->vma
4453 + htab->elf.sgot->output_offset + off);
4455 bfd_put_32 (output_bfd, 0,
4456 htab->elf.sgot->contents + off);
4457 bfd_put_32 (output_bfd, 0,
4458 htab->elf.sgot->contents + off + 4);
4459 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4460 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4461 htab->tls_ldm_got.offset |= 1;
4463 relocation = htab->elf.sgot->output_section->vma
4464 + htab->elf.sgot->output_offset + off
4465 - htab->elf.sgotplt->output_section->vma
4466 - htab->elf.sgotplt->output_offset;
4467 unresolved_reloc = FALSE;
4470 case R_386_TLS_LDO_32:
4471 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4472 relocation -= elf_i386_dtpoff_base (info);
4474 /* When converting LDO to LE, we must negate. */
4475 relocation = -elf_i386_tpoff (info, relocation);
4478 case R_386_TLS_LE_32:
4480 if (!info->executable)
4482 Elf_Internal_Rela outrel;
4485 outrel.r_offset = rel->r_offset
4486 + input_section->output_section->vma
4487 + input_section->output_offset;
4488 if (h != NULL && h->dynindx != -1)
4492 if (r_type == R_386_TLS_LE_32)
4493 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4495 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4496 sreloc = elf_section_data (input_section)->sreloc;
4499 elf_append_rel (output_bfd, sreloc, &outrel);
4502 else if (r_type == R_386_TLS_LE_32)
4503 relocation = elf_i386_dtpoff_base (info) - relocation;
4505 relocation -= elf_i386_dtpoff_base (info);
4507 else if (r_type == R_386_TLS_LE_32)
4508 relocation = elf_i386_tpoff (info, relocation);
4510 relocation = -elf_i386_tpoff (info, relocation);
4517 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4518 because such sections are not SEC_ALLOC and thus ld.so will
4519 not process them. */
4520 if (unresolved_reloc
4521 && !((input_section->flags & SEC_DEBUGGING) != 0
4523 && _bfd_elf_section_offset (output_bfd, info, input_section,
4524 rel->r_offset) != (bfd_vma) -1)
4526 (*_bfd_error_handler)
4527 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4530 (long) rel->r_offset,
4532 h->root.root.string);
4537 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4538 contents, rel->r_offset,
4541 check_relocation_error:
4542 if (r != bfd_reloc_ok)
4547 name = h->root.root.string;
4550 name = bfd_elf_string_from_elf_section (input_bfd,
4551 symtab_hdr->sh_link,
4556 name = bfd_section_name (input_bfd, sec);
4559 if (r == bfd_reloc_overflow)
4561 if (! ((*info->callbacks->reloc_overflow)
4562 (info, (h ? &h->root : NULL), name, howto->name,
4563 (bfd_vma) 0, input_bfd, input_section,
4569 (*_bfd_error_handler)
4570 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4571 input_bfd, input_section,
4572 (long) rel->r_offset, name, (int) r);
4581 /* Finish up dynamic symbol handling. We set the contents of various
4582 dynamic sections here. */
4585 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4586 struct bfd_link_info *info,
4587 struct elf_link_hash_entry *h,
4588 Elf_Internal_Sym *sym)
4590 struct elf_i386_link_hash_table *htab;
4591 unsigned plt_entry_size;
4592 const struct elf_i386_backend_data *abed;
4593 struct elf_i386_link_hash_entry *eh;
4595 htab = elf_i386_hash_table (info);
4599 abed = get_elf_i386_backend_data (output_bfd);
4600 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4602 eh = (struct elf_i386_link_hash_entry *) h;
4604 if (h->plt.offset != (bfd_vma) -1)
4608 Elf_Internal_Rela rel;
4610 asection *plt, *gotplt, *relplt;
4612 /* When building a static executable, use .iplt, .igot.plt and
4613 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4614 if (htab->elf.splt != NULL)
4616 plt = htab->elf.splt;
4617 gotplt = htab->elf.sgotplt;
4618 relplt = htab->elf.srelplt;
4622 plt = htab->elf.iplt;
4623 gotplt = htab->elf.igotplt;
4624 relplt = htab->elf.irelplt;
4627 /* This symbol has an entry in the procedure linkage table. Set
4630 if ((h->dynindx == -1
4631 && !((h->forced_local || info->executable)
4633 && h->type == STT_GNU_IFUNC))
4639 /* Get the index in the procedure linkage table which
4640 corresponds to this symbol. This is the index of this symbol
4641 in all the symbols for which we are making plt entries. The
4642 first entry in the procedure linkage table is reserved.
4644 Get the offset into the .got table of the entry that
4645 corresponds to this function. Each .got entry is 4 bytes.
4646 The first three are reserved.
4648 For static executables, we don't reserve anything. */
4650 if (plt == htab->elf.splt)
4652 got_offset = h->plt.offset / plt_entry_size - 1;
4653 got_offset = (got_offset + 3) * 4;
4657 got_offset = h->plt.offset / plt_entry_size;
4658 got_offset = got_offset * 4;
4661 /* Fill in the entry in the procedure linkage table. */
4664 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4665 abed->plt->plt_entry_size);
4666 bfd_put_32 (output_bfd,
4667 (gotplt->output_section->vma
4668 + gotplt->output_offset
4670 plt->contents + h->plt.offset
4671 + abed->plt->plt_got_offset);
4673 if (abed->is_vxworks)
4675 int s, k, reloc_index;
4677 /* Create the R_386_32 relocation referencing the GOT
4678 for this PLT entry. */
4680 /* S: Current slot number (zero-based). */
4681 s = ((h->plt.offset - abed->plt->plt_entry_size)
4682 / abed->plt->plt_entry_size);
4683 /* K: Number of relocations for PLTResolve. */
4685 k = PLTRESOLVE_RELOCS_SHLIB;
4687 k = PLTRESOLVE_RELOCS;
4688 /* Skip the PLTresolve relocations, and the relocations for
4689 the other PLT slots. */
4690 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4691 loc = (htab->srelplt2->contents + reloc_index
4692 * sizeof (Elf32_External_Rel));
4694 rel.r_offset = (htab->elf.splt->output_section->vma
4695 + htab->elf.splt->output_offset
4696 + h->plt.offset + 2),
4697 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4698 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4700 /* Create the R_386_32 relocation referencing the beginning of
4701 the PLT for this GOT entry. */
4702 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4703 + htab->elf.sgotplt->output_offset
4705 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4706 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4707 loc + sizeof (Elf32_External_Rel));
4712 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4713 abed->plt->plt_entry_size);
4714 bfd_put_32 (output_bfd, got_offset,
4715 plt->contents + h->plt.offset
4716 + abed->plt->plt_got_offset);
4719 /* Fill in the entry in the global offset table. */
4720 bfd_put_32 (output_bfd,
4721 (plt->output_section->vma
4722 + plt->output_offset
4724 + abed->plt->plt_lazy_offset),
4725 gotplt->contents + got_offset);
4727 /* Fill in the entry in the .rel.plt section. */
4728 rel.r_offset = (gotplt->output_section->vma
4729 + gotplt->output_offset
4731 if (h->dynindx == -1
4732 || ((info->executable
4733 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4735 && h->type == STT_GNU_IFUNC))
4737 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4738 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4739 in the .got.plt section. */
4740 bfd_put_32 (output_bfd,
4741 (h->root.u.def.value
4742 + h->root.u.def.section->output_section->vma
4743 + h->root.u.def.section->output_offset),
4744 gotplt->contents + got_offset);
4745 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4746 /* R_386_IRELATIVE comes last. */
4747 plt_index = htab->next_irelative_index--;
4751 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4752 plt_index = htab->next_jump_slot_index++;
4754 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4755 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4757 /* Don't fill PLT entry for static executables. */
4758 if (plt == htab->elf.splt)
4760 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4761 plt->contents + h->plt.offset
4762 + abed->plt->plt_reloc_offset);
4763 bfd_put_32 (output_bfd, - (h->plt.offset
4764 + abed->plt->plt_plt_offset + 4),
4765 plt->contents + h->plt.offset
4766 + abed->plt->plt_plt_offset);
4769 else if (eh->plt_got.offset != (bfd_vma) -1)
4771 bfd_vma got_offset, plt_offset;
4772 asection *plt, *got, *gotplt;
4773 const bfd_byte *got_plt_entry;
4775 /* Offset of displacement of the indirect jump. */
4776 bfd_vma plt_got_offset = 2;
4778 /* Set the entry in the GOT procedure linkage table. */
4779 plt = htab->plt_got;
4780 got = htab->elf.sgot;
4781 gotplt = htab->elf.sgotplt;
4782 got_offset = h->got.offset;
4784 if (got_offset == (bfd_vma) -1
4790 /* Fill in the entry in the GOT procedure linkage table. */
4793 got_plt_entry = elf_i386_got_plt_entry;
4794 got_offset += got->output_section->vma + got->output_offset;
4798 got_plt_entry = elf_i386_pic_got_plt_entry;
4799 got_offset += (got->output_section->vma
4800 + got->output_offset
4801 - gotplt->output_section->vma
4802 - gotplt->output_offset);
4805 plt_offset = eh->plt_got.offset;
4806 memcpy (plt->contents + plt_offset, got_plt_entry,
4807 sizeof (elf_i386_got_plt_entry));
4808 bfd_put_32 (output_bfd, got_offset,
4809 plt->contents + plt_offset + plt_got_offset);
4813 && (h->plt.offset != (bfd_vma) -1
4814 || eh->plt_got.offset != (bfd_vma) -1))
4816 /* Mark the symbol as undefined, rather than as defined in
4817 the .plt section. Leave the value if there were any
4818 relocations where pointer equality matters (this is a clue
4819 for the dynamic linker, to make function pointer
4820 comparisons work between an application and shared
4821 library), otherwise set it to zero. If a function is only
4822 called from a binary, there is no need to slow down
4823 shared libraries because of that. */
4824 sym->st_shndx = SHN_UNDEF;
4825 if (!h->pointer_equality_needed)
4829 if (h->got.offset != (bfd_vma) -1
4830 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4831 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4833 Elf_Internal_Rela rel;
4835 /* This symbol has an entry in the global offset table. Set it
4838 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4841 rel.r_offset = (htab->elf.sgot->output_section->vma
4842 + htab->elf.sgot->output_offset
4843 + (h->got.offset & ~(bfd_vma) 1));
4845 /* If this is a static link, or it is a -Bsymbolic link and the
4846 symbol is defined locally or was forced to be local because
4847 of a version file, we just want to emit a RELATIVE reloc.
4848 The entry in the global offset table will already have been
4849 initialized in the relocate_section function. */
4851 && h->type == STT_GNU_IFUNC)
4855 /* Generate R_386_GLOB_DAT. */
4862 if (!h->pointer_equality_needed)
4865 /* For non-shared object, we can't use .got.plt, which
4866 contains the real function addres if we need pointer
4867 equality. We load the GOT entry with the PLT entry. */
4868 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4869 bfd_put_32 (output_bfd,
4870 (plt->output_section->vma
4871 + plt->output_offset + h->plt.offset),
4872 htab->elf.sgot->contents + h->got.offset);
4876 else if (info->shared
4877 && SYMBOL_REFERENCES_LOCAL (info, h))
4879 BFD_ASSERT((h->got.offset & 1) != 0);
4880 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4884 BFD_ASSERT((h->got.offset & 1) == 0);
4886 bfd_put_32 (output_bfd, (bfd_vma) 0,
4887 htab->elf.sgot->contents + h->got.offset);
4888 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4891 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4896 Elf_Internal_Rela rel;
4898 /* This symbol needs a copy reloc. Set it up. */
4900 if (h->dynindx == -1
4901 || (h->root.type != bfd_link_hash_defined
4902 && h->root.type != bfd_link_hash_defweak)
4903 || htab->srelbss == NULL)
4906 rel.r_offset = (h->root.u.def.value
4907 + h->root.u.def.section->output_section->vma
4908 + h->root.u.def.section->output_offset);
4909 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4910 elf_append_rel (output_bfd, htab->srelbss, &rel);
4916 /* Finish up local dynamic symbol handling. We set the contents of
4917 various dynamic sections here. */
4920 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4922 struct elf_link_hash_entry *h
4923 = (struct elf_link_hash_entry *) *slot;
4924 struct bfd_link_info *info
4925 = (struct bfd_link_info *) inf;
4927 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4931 /* Used to decide how to sort relocs in an optimal manner for the
4932 dynamic linker, before writing them out. */
4934 static enum elf_reloc_type_class
4935 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4936 const asection *rel_sec ATTRIBUTE_UNUSED,
4937 const Elf_Internal_Rela *rela)
4939 switch (ELF32_R_TYPE (rela->r_info))
4941 case R_386_RELATIVE:
4942 return reloc_class_relative;
4943 case R_386_JUMP_SLOT:
4944 return reloc_class_plt;
4946 return reloc_class_copy;
4948 return reloc_class_normal;
4952 /* Finish up the dynamic sections. */
4955 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4956 struct bfd_link_info *info)
4958 struct elf_i386_link_hash_table *htab;
4961 const struct elf_i386_backend_data *abed;
4963 htab = elf_i386_hash_table (info);
4967 dynobj = htab->elf.dynobj;
4968 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4969 abed = get_elf_i386_backend_data (output_bfd);
4971 if (htab->elf.dynamic_sections_created)
4973 Elf32_External_Dyn *dyncon, *dynconend;
4975 if (sdyn == NULL || htab->elf.sgot == NULL)
4978 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4979 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4980 for (; dyncon < dynconend; dyncon++)
4982 Elf_Internal_Dyn dyn;
4985 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4990 if (abed->is_vxworks
4991 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4996 s = htab->elf.sgotplt;
4997 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5001 s = htab->elf.srelplt;
5002 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5006 s = htab->elf.srelplt;
5007 dyn.d_un.d_val = s->size;
5011 /* My reading of the SVR4 ABI indicates that the
5012 procedure linkage table relocs (DT_JMPREL) should be
5013 included in the overall relocs (DT_REL). This is
5014 what Solaris does. However, UnixWare can not handle
5015 that case. Therefore, we override the DT_RELSZ entry
5016 here to make it not include the JMPREL relocs. */
5017 s = htab->elf.srelplt;
5020 dyn.d_un.d_val -= s->size;
5024 /* We may not be using the standard ELF linker script.
5025 If .rel.plt is the first .rel section, we adjust
5026 DT_REL to not include it. */
5027 s = htab->elf.srelplt;
5030 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5032 dyn.d_un.d_ptr += s->size;
5036 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5039 /* Fill in the first entry in the procedure linkage table. */
5040 if (htab->elf.splt && htab->elf.splt->size > 0)
5044 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5045 abed->plt->plt0_entry_size);
5046 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5047 abed->plt0_pad_byte,
5048 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5052 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5053 abed->plt->plt0_entry_size);
5054 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5055 abed->plt0_pad_byte,
5056 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5057 bfd_put_32 (output_bfd,
5058 (htab->elf.sgotplt->output_section->vma
5059 + htab->elf.sgotplt->output_offset
5061 htab->elf.splt->contents
5062 + abed->plt->plt0_got1_offset);
5063 bfd_put_32 (output_bfd,
5064 (htab->elf.sgotplt->output_section->vma
5065 + htab->elf.sgotplt->output_offset
5067 htab->elf.splt->contents
5068 + abed->plt->plt0_got2_offset);
5070 if (abed->is_vxworks)
5072 Elf_Internal_Rela rel;
5074 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5075 On IA32 we use REL relocations so the addend goes in
5076 the PLT directly. */
5077 rel.r_offset = (htab->elf.splt->output_section->vma
5078 + htab->elf.splt->output_offset
5079 + abed->plt->plt0_got1_offset);
5080 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5081 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5082 htab->srelplt2->contents);
5083 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5084 rel.r_offset = (htab->elf.splt->output_section->vma
5085 + htab->elf.splt->output_offset
5086 + abed->plt->plt0_got2_offset);
5087 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5088 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5089 htab->srelplt2->contents +
5090 sizeof (Elf32_External_Rel));
5094 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5095 really seem like the right value. */
5096 elf_section_data (htab->elf.splt->output_section)
5097 ->this_hdr.sh_entsize = 4;
5099 /* Correct the .rel.plt.unloaded relocations. */
5100 if (abed->is_vxworks && !info->shared)
5102 int num_plts = (htab->elf.splt->size
5103 / abed->plt->plt_entry_size) - 1;
5106 p = htab->srelplt2->contents;
5108 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5110 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5112 for (; num_plts; num_plts--)
5114 Elf_Internal_Rela rel;
5115 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5116 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5117 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5118 p += sizeof (Elf32_External_Rel);
5120 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5121 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5122 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5123 p += sizeof (Elf32_External_Rel);
5129 if (htab->elf.sgotplt)
5131 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5133 (*_bfd_error_handler)
5134 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5138 /* Fill in the first three entries in the global offset table. */
5139 if (htab->elf.sgotplt->size > 0)
5141 bfd_put_32 (output_bfd,
5143 : sdyn->output_section->vma + sdyn->output_offset),
5144 htab->elf.sgotplt->contents);
5145 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5146 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5149 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5152 /* Adjust .eh_frame for .plt section. */
5153 if (htab->plt_eh_frame != NULL
5154 && htab->plt_eh_frame->contents != NULL)
5156 if (htab->elf.splt != NULL
5157 && htab->elf.splt->size != 0
5158 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5159 && htab->elf.splt->output_section != NULL
5160 && htab->plt_eh_frame->output_section != NULL)
5162 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5163 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5164 + htab->plt_eh_frame->output_offset
5165 + PLT_FDE_START_OFFSET;
5166 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5167 htab->plt_eh_frame->contents
5168 + PLT_FDE_START_OFFSET);
5170 if (htab->plt_eh_frame->sec_info_type
5171 == SEC_INFO_TYPE_EH_FRAME)
5173 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5175 htab->plt_eh_frame->contents))
5180 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5181 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5183 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5184 htab_traverse (htab->loc_hash_table,
5185 elf_i386_finish_local_dynamic_symbol,
5191 /* Return an array of PLT entry symbol values. */
5194 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5197 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5200 bfd_vma *plt_sym_val;
5202 bfd_byte *plt_contents;
5203 const struct elf_i386_backend_data *bed
5204 = get_elf_i386_backend_data (abfd);
5205 Elf_Internal_Shdr *hdr;
5207 /* Get the .plt section contents. */
5208 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5209 if (plt_contents == NULL)
5211 if (!bfd_get_section_contents (abfd, (asection *) plt,
5212 plt_contents, 0, plt->size))
5215 free (plt_contents);
5219 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5220 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5223 hdr = &elf_section_data (relplt)->this_hdr;
5224 count = relplt->size / hdr->sh_entsize;
5226 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5227 if (plt_sym_val == NULL)
5230 for (i = 0; i < count; i++)
5231 plt_sym_val[i] = -1;
5233 plt_offset = bed->plt->plt_entry_size;
5234 p = relplt->relocation;
5235 for (i = 0; i < count; i++, p++)
5239 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5240 if (p->howto == NULL)
5243 if (p->howto->type != R_386_JUMP_SLOT
5244 && p->howto->type != R_386_IRELATIVE)
5247 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5248 + bed->plt->plt_reloc_offset));
5249 reloc_index /= sizeof (Elf32_External_Rel);
5250 if (reloc_index >= count)
5252 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5253 plt_offset += bed->plt->plt_entry_size;
5256 free (plt_contents);
5261 /* Similar to _bfd_elf_get_synthetic_symtab. */
5264 elf_i386_get_synthetic_symtab (bfd *abfd,
5271 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5272 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5273 dynsymcount, dynsyms, ret,
5275 elf_i386_get_plt_sym_val);
5278 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5281 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5283 if (h->plt.offset != (bfd_vma) -1
5285 && !h->pointer_equality_needed)
5288 return _bfd_elf_hash_symbol (h);
5291 /* Hook called by the linker routine which adds symbols from an object
5295 elf_i386_add_symbol_hook (bfd * abfd,
5296 struct bfd_link_info * info,
5297 Elf_Internal_Sym * sym,
5298 const char ** namep ATTRIBUTE_UNUSED,
5299 flagword * flagsp ATTRIBUTE_UNUSED,
5300 asection ** secp ATTRIBUTE_UNUSED,
5301 bfd_vma * valp ATTRIBUTE_UNUSED)
5303 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5304 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5305 && (abfd->flags & DYNAMIC) == 0
5306 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5307 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5312 #define TARGET_LITTLE_SYM i386_elf32_vec
5313 #define TARGET_LITTLE_NAME "elf32-i386"
5314 #define ELF_ARCH bfd_arch_i386
5315 #define ELF_TARGET_ID I386_ELF_DATA
5316 #define ELF_MACHINE_CODE EM_386
5317 #define ELF_MAXPAGESIZE 0x1000
5319 #define elf_backend_can_gc_sections 1
5320 #define elf_backend_can_refcount 1
5321 #define elf_backend_want_got_plt 1
5322 #define elf_backend_plt_readonly 1
5323 #define elf_backend_want_plt_sym 0
5324 #define elf_backend_got_header_size 12
5325 #define elf_backend_plt_alignment 4
5326 #define elf_backend_extern_protected_data 1
5328 /* Support RELA for objdump of prelink objects. */
5329 #define elf_info_to_howto elf_i386_info_to_howto_rel
5330 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5332 #define bfd_elf32_mkobject elf_i386_mkobject
5334 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5335 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5336 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5337 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5338 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5340 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5341 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5342 #define elf_backend_check_relocs elf_i386_check_relocs
5343 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5344 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5345 #define elf_backend_fake_sections elf_i386_fake_sections
5346 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5347 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5348 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5349 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5350 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5351 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5352 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5353 #define elf_backend_relocate_section elf_i386_relocate_section
5354 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5355 #define elf_backend_always_size_sections elf_i386_always_size_sections
5356 #define elf_backend_omit_section_dynsym \
5357 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5358 #define elf_backend_hash_symbol elf_i386_hash_symbol
5359 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5361 #include "elf32-target.h"
5363 /* FreeBSD support. */
5365 #undef TARGET_LITTLE_SYM
5366 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5367 #undef TARGET_LITTLE_NAME
5368 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5370 #define ELF_OSABI ELFOSABI_FREEBSD
5372 /* The kernel recognizes executables as valid only if they carry a
5373 "FreeBSD" label in the ELF header. So we put this label on all
5374 executables and (for simplicity) also all other object files. */
5377 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5379 _bfd_elf_post_process_headers (abfd, info);
5381 #ifdef OLD_FREEBSD_ABI_LABEL
5383 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5384 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5385 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5390 #undef elf_backend_post_process_headers
5391 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5393 #define elf32_bed elf32_i386_fbsd_bed
5395 #undef elf_backend_add_symbol_hook
5397 #include "elf32-target.h"
5401 #undef TARGET_LITTLE_SYM
5402 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5403 #undef TARGET_LITTLE_NAME
5404 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5406 #undef elf_backend_post_process_headers
5408 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5409 objects won't be recognized. */
5413 #define elf32_bed elf32_i386_sol2_bed
5415 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5417 #undef elf_backend_static_tls_alignment
5418 #define elf_backend_static_tls_alignment 8
5420 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5422 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5424 #undef elf_backend_want_plt_sym
5425 #define elf_backend_want_plt_sym 1
5427 #include "elf32-target.h"
5429 /* Native Client support. */
5431 #undef TARGET_LITTLE_SYM
5432 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5433 #undef TARGET_LITTLE_NAME
5434 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5436 #define elf32_bed elf32_i386_nacl_bed
5438 #undef ELF_MAXPAGESIZE
5439 #define ELF_MAXPAGESIZE 0x10000
5441 /* Restore defaults. */
5443 #undef elf_backend_want_plt_sym
5444 #define elf_backend_want_plt_sym 0
5445 #undef elf_backend_post_process_headers
5446 #undef elf_backend_static_tls_alignment
5448 /* NaCl uses substantially different PLT entries for the same effects. */
5450 #undef elf_backend_plt_alignment
5451 #define elf_backend_plt_alignment 5
5452 #define NACL_PLT_ENTRY_SIZE 64
5453 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5455 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5457 0xff, 0x35, /* pushl contents of address */
5458 0, 0, 0, 0, /* replaced with address of .got + 4. */
5459 0x8b, 0x0d, /* movl contents of address, %ecx */
5460 0, 0, 0, 0, /* replaced with address of .got + 8. */
5461 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5462 0xff, 0xe1 /* jmp *%ecx */
5465 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5467 0x8b, 0x0d, /* movl contents of address, %ecx */
5468 0, 0, 0, 0, /* replaced with GOT slot address. */
5469 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5470 0xff, 0xe1, /* jmp *%ecx */
5472 /* Pad to the next 32-byte boundary with nop instructions. */
5474 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5475 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5477 /* Lazy GOT entries point here (32-byte aligned). */
5478 0x68, /* pushl immediate */
5479 0, 0, 0, 0, /* replaced with reloc offset. */
5480 0xe9, /* jmp relative */
5481 0, 0, 0, 0, /* replaced with offset to .plt. */
5483 /* Pad to the next 32-byte boundary with nop instructions. */
5484 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5485 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5489 static const bfd_byte
5490 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5492 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5493 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5494 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5495 0xff, 0xe1, /* jmp *%ecx */
5497 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5498 so pad to that size with nop instructions. */
5499 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5502 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5504 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5505 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5506 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5507 0xff, 0xe1, /* jmp *%ecx */
5509 /* Pad to the next 32-byte boundary with nop instructions. */
5511 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5512 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5514 /* Lazy GOT entries point here (32-byte aligned). */
5515 0x68, /* pushl immediate */
5516 0, 0, 0, 0, /* replaced with offset into relocation table. */
5517 0xe9, /* jmp relative */
5518 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5520 /* Pad to the next 32-byte boundary with nop instructions. */
5521 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5522 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5526 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5528 #if (PLT_CIE_LENGTH != 20 \
5529 || PLT_FDE_LENGTH != 36 \
5530 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5531 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5532 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5534 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5535 0, 0, 0, 0, /* CIE ID */
5536 1, /* CIE version */
5537 'z', 'R', 0, /* Augmentation string */
5538 1, /* Code alignment factor */
5539 0x7c, /* Data alignment factor: -4 */
5540 8, /* Return address column */
5541 1, /* Augmentation size */
5542 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5543 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5544 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5545 DW_CFA_nop, DW_CFA_nop,
5547 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5548 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5549 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5550 0, 0, 0, 0, /* .plt size goes here */
5551 0, /* Augmentation size */
5552 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5553 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5554 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5555 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5556 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5557 13, /* Block length */
5558 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5559 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5560 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5561 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5562 DW_CFA_nop, DW_CFA_nop
5565 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5567 elf_i386_nacl_plt0_entry, /* plt0_entry */
5568 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5569 2, /* plt0_got1_offset */
5570 8, /* plt0_got2_offset */
5571 elf_i386_nacl_plt_entry, /* plt_entry */
5572 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5573 2, /* plt_got_offset */
5574 33, /* plt_reloc_offset */
5575 38, /* plt_plt_offset */
5576 32, /* plt_lazy_offset */
5577 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5578 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5579 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5580 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5583 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5585 &elf_i386_nacl_plt, /* plt */
5586 0x90, /* plt0_pad_byte: nop insn */
5591 elf32_i386_nacl_elf_object_p (bfd *abfd)
5593 /* Set the right machine number for a NaCl i386 ELF32 file. */
5594 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5598 #undef elf_backend_arch_data
5599 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5601 #undef elf_backend_object_p
5602 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5603 #undef elf_backend_modify_segment_map
5604 #define elf_backend_modify_segment_map nacl_modify_segment_map
5605 #undef elf_backend_modify_program_headers
5606 #define elf_backend_modify_program_headers nacl_modify_program_headers
5607 #undef elf_backend_final_write_processing
5608 #define elf_backend_final_write_processing nacl_final_write_processing
5610 #include "elf32-target.h"
5612 /* Restore defaults. */
5613 #undef elf_backend_object_p
5614 #undef elf_backend_modify_segment_map
5615 #undef elf_backend_modify_program_headers
5616 #undef elf_backend_final_write_processing
5618 /* VxWorks support. */
5620 #undef TARGET_LITTLE_SYM
5621 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5622 #undef TARGET_LITTLE_NAME
5623 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5625 #undef elf_backend_plt_alignment
5626 #define elf_backend_plt_alignment 4
5628 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5630 &elf_i386_plt, /* plt */
5631 0x90, /* plt0_pad_byte */
5635 #undef elf_backend_arch_data
5636 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5638 #undef elf_backend_relocs_compatible
5639 #undef elf_backend_add_symbol_hook
5640 #define elf_backend_add_symbol_hook \
5641 elf_vxworks_add_symbol_hook
5642 #undef elf_backend_link_output_symbol_hook
5643 #define elf_backend_link_output_symbol_hook \
5644 elf_vxworks_link_output_symbol_hook
5645 #undef elf_backend_emit_relocs
5646 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5647 #undef elf_backend_final_write_processing
5648 #define elf_backend_final_write_processing \
5649 elf_vxworks_final_write_processing
5650 #undef elf_backend_static_tls_alignment
5652 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5654 #undef elf_backend_want_plt_sym
5655 #define elf_backend_want_plt_sym 1
5658 #define elf32_bed elf32_i386_vxworks_bed
5660 #include "elf32-target.h"