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, 0, 0, FALSE, 0, complain_overflow_bitfield,
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 /* Information about the GOT PLT entry. Filled when there are both
760 GOT and PLT relocations against the same function. */
761 union gotplt_union plt_got;
763 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
764 starting at the end of the jump table. */
768 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
770 struct elf_i386_obj_tdata
772 struct elf_obj_tdata root;
774 /* tls_type for each local got entry. */
775 char *local_got_tls_type;
777 /* GOTPLT entries for TLS descriptors. */
778 bfd_vma *local_tlsdesc_gotent;
781 #define elf_i386_tdata(abfd) \
782 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
784 #define elf_i386_local_got_tls_type(abfd) \
785 (elf_i386_tdata (abfd)->local_got_tls_type)
787 #define elf_i386_local_tlsdesc_gotent(abfd) \
788 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
790 #define is_i386_elf(bfd) \
791 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
792 && elf_tdata (bfd) != NULL \
793 && elf_object_id (bfd) == I386_ELF_DATA)
796 elf_i386_mkobject (bfd *abfd)
798 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
802 /* i386 ELF linker hash table. */
804 struct elf_i386_link_hash_table
806 struct elf_link_hash_table elf;
808 /* Short-cuts to get to dynamic linker sections. */
811 asection *plt_eh_frame;
816 bfd_signed_vma refcount;
820 /* The amount of space used by the reserved portion of the sgotplt
821 section, plus whatever space is used by the jump slots. */
822 bfd_vma sgotplt_jump_table_size;
824 /* Small local sym cache. */
825 struct sym_cache sym_cache;
827 /* _TLS_MODULE_BASE_ symbol. */
828 struct bfd_link_hash_entry *tls_module_base;
830 /* Used by local STT_GNU_IFUNC symbols. */
831 htab_t loc_hash_table;
832 void * loc_hash_memory;
834 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
837 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
838 bfd_vma next_tls_desc_index;
840 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
841 bfd_vma next_jump_slot_index;
843 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
844 bfd_vma next_irelative_index;
847 /* Get the i386 ELF linker hash table from a link_info structure. */
849 #define elf_i386_hash_table(p) \
850 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
851 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
853 #define elf_i386_compute_jump_table_size(htab) \
854 ((htab)->elf.srelplt->reloc_count * 4)
856 /* Create an entry in an i386 ELF linker hash table. */
858 static struct bfd_hash_entry *
859 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
860 struct bfd_hash_table *table,
863 /* Allocate the structure if it has not already been allocated by a
867 entry = (struct bfd_hash_entry *)
868 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
873 /* Call the allocation method of the superclass. */
874 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
877 struct elf_i386_link_hash_entry *eh;
879 eh = (struct elf_i386_link_hash_entry *) entry;
880 eh->dyn_relocs = NULL;
881 eh->tls_type = GOT_UNKNOWN;
882 eh->plt_got.offset = (bfd_vma) -1;
883 eh->tlsdesc_got = (bfd_vma) -1;
889 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
890 for local symbol so that we can handle local STT_GNU_IFUNC symbols
891 as global symbol. We reuse indx and dynstr_index for local symbol
892 hash since they aren't used by global symbols in this backend. */
895 elf_i386_local_htab_hash (const void *ptr)
897 struct elf_link_hash_entry *h
898 = (struct elf_link_hash_entry *) ptr;
899 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
902 /* Compare local hash entries. */
905 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
907 struct elf_link_hash_entry *h1
908 = (struct elf_link_hash_entry *) ptr1;
909 struct elf_link_hash_entry *h2
910 = (struct elf_link_hash_entry *) ptr2;
912 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
915 /* Find and/or create a hash entry for local symbol. */
917 static struct elf_link_hash_entry *
918 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
919 bfd *abfd, const Elf_Internal_Rela *rel,
922 struct elf_i386_link_hash_entry e, *ret;
923 asection *sec = abfd->sections;
924 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
925 ELF32_R_SYM (rel->r_info));
928 e.elf.indx = sec->id;
929 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
930 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
931 create ? INSERT : NO_INSERT);
938 ret = (struct elf_i386_link_hash_entry *) *slot;
942 ret = (struct elf_i386_link_hash_entry *)
943 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
944 sizeof (struct elf_i386_link_hash_entry));
947 memset (ret, 0, sizeof (*ret));
948 ret->elf.indx = sec->id;
949 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
950 ret->elf.dynindx = -1;
951 ret->plt_got.offset = (bfd_vma) -1;
957 /* Destroy an i386 ELF linker hash table. */
960 elf_i386_link_hash_table_free (bfd *obfd)
962 struct elf_i386_link_hash_table *htab
963 = (struct elf_i386_link_hash_table *) obfd->link.hash;
965 if (htab->loc_hash_table)
966 htab_delete (htab->loc_hash_table);
967 if (htab->loc_hash_memory)
968 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
969 _bfd_elf_link_hash_table_free (obfd);
972 /* Create an i386 ELF linker hash table. */
974 static struct bfd_link_hash_table *
975 elf_i386_link_hash_table_create (bfd *abfd)
977 struct elf_i386_link_hash_table *ret;
978 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
980 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
984 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
985 elf_i386_link_hash_newfunc,
986 sizeof (struct elf_i386_link_hash_entry),
993 ret->loc_hash_table = htab_try_create (1024,
994 elf_i386_local_htab_hash,
995 elf_i386_local_htab_eq,
997 ret->loc_hash_memory = objalloc_create ();
998 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1000 elf_i386_link_hash_table_free (abfd);
1003 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1005 return &ret->elf.root;
1008 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1009 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1013 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1015 struct elf_i386_link_hash_table *htab;
1017 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1020 htab = elf_i386_hash_table (info);
1024 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1026 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1029 || (!info->shared && !htab->srelbss))
1032 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1033 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1037 if (!info->no_ld_generated_unwind_info
1038 && htab->plt_eh_frame == NULL
1039 && htab->elf.splt != NULL)
1041 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1042 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1043 | SEC_LINKER_CREATED);
1045 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1046 if (htab->plt_eh_frame == NULL
1047 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1054 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1057 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1058 struct elf_link_hash_entry *dir,
1059 struct elf_link_hash_entry *ind)
1061 struct elf_i386_link_hash_entry *edir, *eind;
1063 edir = (struct elf_i386_link_hash_entry *) dir;
1064 eind = (struct elf_i386_link_hash_entry *) ind;
1066 if (eind->dyn_relocs != NULL)
1068 if (edir->dyn_relocs != NULL)
1070 struct elf_dyn_relocs **pp;
1071 struct elf_dyn_relocs *p;
1073 /* Add reloc counts against the indirect sym to the direct sym
1074 list. Merge any entries against the same section. */
1075 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1077 struct elf_dyn_relocs *q;
1079 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1080 if (q->sec == p->sec)
1082 q->pc_count += p->pc_count;
1083 q->count += p->count;
1090 *pp = edir->dyn_relocs;
1093 edir->dyn_relocs = eind->dyn_relocs;
1094 eind->dyn_relocs = NULL;
1097 if (ind->root.type == bfd_link_hash_indirect
1098 && dir->got.refcount <= 0)
1100 edir->tls_type = eind->tls_type;
1101 eind->tls_type = GOT_UNKNOWN;
1104 if (ELIMINATE_COPY_RELOCS
1105 && ind->root.type != bfd_link_hash_indirect
1106 && dir->dynamic_adjusted)
1108 /* If called to transfer flags for a weakdef during processing
1109 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1110 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1111 dir->ref_dynamic |= ind->ref_dynamic;
1112 dir->ref_regular |= ind->ref_regular;
1113 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1114 dir->needs_plt |= ind->needs_plt;
1115 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1118 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1121 /* Return TRUE if the TLS access code sequence support transition
1125 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1127 Elf_Internal_Shdr *symtab_hdr,
1128 struct elf_link_hash_entry **sym_hashes,
1129 unsigned int r_type,
1130 const Elf_Internal_Rela *rel,
1131 const Elf_Internal_Rela *relend)
1133 unsigned int val, type;
1134 unsigned long r_symndx;
1135 struct elf_link_hash_entry *h;
1138 /* Get the section contents. */
1139 if (contents == NULL)
1141 if (elf_section_data (sec)->this_hdr.contents != NULL)
1142 contents = elf_section_data (sec)->this_hdr.contents;
1145 /* FIXME: How to better handle error condition? */
1146 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1149 /* Cache the section contents for elf_link_input_bfd. */
1150 elf_section_data (sec)->this_hdr.contents = contents;
1154 offset = rel->r_offset;
1159 if (offset < 2 || (rel + 1) >= relend)
1162 type = bfd_get_8 (abfd, contents + offset - 2);
1163 if (r_type == R_386_TLS_GD)
1165 /* Check transition from GD access model. Only
1166 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1167 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1168 can transit to different access model. */
1169 if ((offset + 10) > sec->size ||
1170 (type != 0x8d && type != 0x04))
1173 val = bfd_get_8 (abfd, contents + offset - 1);
1176 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1180 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1183 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1188 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1189 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1192 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1198 /* Check transition from LD access model. Only
1199 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1200 can transit to different access model. */
1201 if (type != 0x8d || (offset + 9) > sec->size)
1204 val = bfd_get_8 (abfd, contents + offset - 1);
1205 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1209 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1212 r_symndx = ELF32_R_SYM (rel[1].r_info);
1213 if (r_symndx < symtab_hdr->sh_info)
1216 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1217 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1218 may be versioned. */
1220 && h->root.root.string != NULL
1221 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1222 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1223 && (strncmp (h->root.root.string, "___tls_get_addr",
1227 /* Check transition from IE access model:
1228 movl foo@indntpoff(%rip), %eax
1229 movl foo@indntpoff(%rip), %reg
1230 addl foo@indntpoff(%rip), %reg
1233 if (offset < 1 || (offset + 4) > sec->size)
1236 /* Check "movl foo@tpoff(%rip), %eax" first. */
1237 val = bfd_get_8 (abfd, contents + offset - 1);
1244 /* Check movl|addl foo@tpoff(%rip), %reg. */
1245 type = bfd_get_8 (abfd, contents + offset - 2);
1246 return ((type == 0x8b || type == 0x03)
1247 && (val & 0xc7) == 0x05);
1249 case R_386_TLS_GOTIE:
1250 case R_386_TLS_IE_32:
1251 /* Check transition from {IE_32,GOTIE} access model:
1252 subl foo@{tpoff,gontoff}(%reg1), %reg2
1253 movl foo@{tpoff,gontoff}(%reg1), %reg2
1254 addl foo@{tpoff,gontoff}(%reg1), %reg2
1257 if (offset < 2 || (offset + 4) > sec->size)
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1261 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1264 type = bfd_get_8 (abfd, contents + offset - 2);
1265 return type == 0x8b || type == 0x2b || type == 0x03;
1267 case R_386_TLS_GOTDESC:
1268 /* Check transition from GDesc access model:
1269 leal x@tlsdesc(%ebx), %eax
1271 Make sure it's a leal adding ebx to a 32-bit offset
1272 into any register, although it's probably almost always
1275 if (offset < 2 || (offset + 4) > sec->size)
1278 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1281 val = bfd_get_8 (abfd, contents + offset - 1);
1282 return (val & 0xc7) == 0x83;
1284 case R_386_TLS_DESC_CALL:
1285 /* Check transition from GDesc access model:
1286 call *x@tlsdesc(%rax)
1288 if (offset + 2 <= sec->size)
1290 /* Make sure that it's a call *x@tlsdesc(%rax). */
1291 static const unsigned char call[] = { 0xff, 0x10 };
1292 return memcmp (contents + offset, call, 2) == 0;
1302 /* Return TRUE if the TLS access transition is OK or no transition
1303 will be performed. Update R_TYPE if there is a transition. */
1306 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1307 asection *sec, bfd_byte *contents,
1308 Elf_Internal_Shdr *symtab_hdr,
1309 struct elf_link_hash_entry **sym_hashes,
1310 unsigned int *r_type, int tls_type,
1311 const Elf_Internal_Rela *rel,
1312 const Elf_Internal_Rela *relend,
1313 struct elf_link_hash_entry *h,
1314 unsigned long r_symndx)
1316 unsigned int from_type = *r_type;
1317 unsigned int to_type = from_type;
1318 bfd_boolean check = TRUE;
1320 /* Skip TLS transition for functions. */
1322 && (h->type == STT_FUNC
1323 || h->type == STT_GNU_IFUNC))
1329 case R_386_TLS_GOTDESC:
1330 case R_386_TLS_DESC_CALL:
1331 case R_386_TLS_IE_32:
1333 case R_386_TLS_GOTIE:
1334 if (info->executable)
1337 to_type = R_386_TLS_LE_32;
1338 else if (from_type != R_386_TLS_IE
1339 && from_type != R_386_TLS_GOTIE)
1340 to_type = R_386_TLS_IE_32;
1343 /* When we are called from elf_i386_relocate_section, CONTENTS
1344 isn't NULL and there may be additional transitions based on
1346 if (contents != NULL)
1348 unsigned int new_to_type = to_type;
1350 if (info->executable
1353 && (tls_type & GOT_TLS_IE))
1354 new_to_type = R_386_TLS_LE_32;
1356 if (to_type == R_386_TLS_GD
1357 || to_type == R_386_TLS_GOTDESC
1358 || to_type == R_386_TLS_DESC_CALL)
1360 if (tls_type == GOT_TLS_IE_POS)
1361 new_to_type = R_386_TLS_GOTIE;
1362 else if (tls_type & GOT_TLS_IE)
1363 new_to_type = R_386_TLS_IE_32;
1366 /* We checked the transition before when we were called from
1367 elf_i386_check_relocs. We only want to check the new
1368 transition which hasn't been checked before. */
1369 check = new_to_type != to_type && from_type == to_type;
1370 to_type = new_to_type;
1376 if (info->executable)
1377 to_type = R_386_TLS_LE_32;
1384 /* Return TRUE if there is no transition. */
1385 if (from_type == to_type)
1388 /* Check if the transition can be performed. */
1390 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1391 symtab_hdr, sym_hashes,
1392 from_type, rel, relend))
1394 reloc_howto_type *from, *to;
1397 from = elf_i386_rtype_to_howto (abfd, from_type);
1398 to = elf_i386_rtype_to_howto (abfd, to_type);
1401 name = h->root.root.string;
1404 struct elf_i386_link_hash_table *htab;
1406 htab = elf_i386_hash_table (info);
1411 Elf_Internal_Sym *isym;
1413 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1415 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1419 (*_bfd_error_handler)
1420 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1421 "in section `%A' failed"),
1422 abfd, sec, from->name, to->name, name,
1423 (unsigned long) rel->r_offset);
1424 bfd_set_error (bfd_error_bad_value);
1432 /* Look through the relocs for a section during the first phase, and
1433 calculate needed space in the global offset table, procedure linkage
1434 table, and dynamic reloc sections. */
1437 elf_i386_check_relocs (bfd *abfd,
1438 struct bfd_link_info *info,
1440 const Elf_Internal_Rela *relocs)
1442 struct elf_i386_link_hash_table *htab;
1443 Elf_Internal_Shdr *symtab_hdr;
1444 struct elf_link_hash_entry **sym_hashes;
1445 const Elf_Internal_Rela *rel;
1446 const Elf_Internal_Rela *rel_end;
1448 bfd_boolean use_plt_got;
1450 if (info->relocatable)
1453 BFD_ASSERT (is_i386_elf (abfd));
1455 htab = elf_i386_hash_table (info);
1459 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1460 && (get_elf_i386_backend_data (abfd)
1461 == &elf_i386_arch_bed));
1463 symtab_hdr = &elf_symtab_hdr (abfd);
1464 sym_hashes = elf_sym_hashes (abfd);
1468 rel_end = relocs + sec->reloc_count;
1469 for (rel = relocs; rel < rel_end; rel++)
1471 unsigned int r_type;
1472 unsigned long r_symndx;
1473 struct elf_link_hash_entry *h;
1474 Elf_Internal_Sym *isym;
1476 bfd_boolean size_reloc;
1478 r_symndx = ELF32_R_SYM (rel->r_info);
1479 r_type = ELF32_R_TYPE (rel->r_info);
1481 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1483 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1489 if (r_symndx < symtab_hdr->sh_info)
1491 /* A local symbol. */
1492 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1497 /* Check relocation against local STT_GNU_IFUNC symbol. */
1498 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1500 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1504 /* Fake a STT_GNU_IFUNC symbol. */
1505 h->type = STT_GNU_IFUNC;
1508 h->forced_local = 1;
1509 h->root.type = bfd_link_hash_defined;
1517 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1518 while (h->root.type == bfd_link_hash_indirect
1519 || h->root.type == bfd_link_hash_warning)
1520 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1525 /* Create the ifunc sections for static executables. If we
1526 never see an indirect function symbol nor we are building
1527 a static executable, those sections will be empty and
1528 won't appear in output. */
1539 if (htab->elf.dynobj == NULL)
1540 htab->elf.dynobj = abfd;
1541 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1546 /* It is referenced by a non-shared object. */
1548 h->root.non_ir_ref = 1;
1551 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1552 symtab_hdr, sym_hashes,
1553 &r_type, GOT_UNKNOWN,
1554 rel, rel_end, h, r_symndx))
1560 htab->tls_ldm_got.refcount += 1;
1564 /* This symbol requires a procedure linkage table entry. We
1565 actually build the entry in adjust_dynamic_symbol,
1566 because this might be a case of linking PIC code which is
1567 never referenced by a dynamic object, in which case we
1568 don't need to generate a procedure linkage table entry
1571 /* If this is a local symbol, we resolve it directly without
1572 creating a procedure linkage table entry. */
1577 h->plt.refcount += 1;
1584 case R_386_TLS_IE_32:
1586 case R_386_TLS_GOTIE:
1587 if (!info->executable)
1588 info->flags |= DF_STATIC_TLS;
1593 case R_386_TLS_GOTDESC:
1594 case R_386_TLS_DESC_CALL:
1595 /* This symbol requires a global offset table entry. */
1597 int tls_type, old_tls_type;
1602 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1603 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1604 case R_386_TLS_GOTDESC:
1605 case R_386_TLS_DESC_CALL:
1606 tls_type = GOT_TLS_GDESC; break;
1607 case R_386_TLS_IE_32:
1608 if (ELF32_R_TYPE (rel->r_info) == r_type)
1609 tls_type = GOT_TLS_IE_NEG;
1611 /* If this is a GD->IE transition, we may use either of
1612 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1613 tls_type = GOT_TLS_IE;
1616 case R_386_TLS_GOTIE:
1617 tls_type = GOT_TLS_IE_POS; break;
1622 h->got.refcount += 1;
1623 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1627 bfd_signed_vma *local_got_refcounts;
1629 /* This is a global offset table entry for a local symbol. */
1630 local_got_refcounts = elf_local_got_refcounts (abfd);
1631 if (local_got_refcounts == NULL)
1635 size = symtab_hdr->sh_info;
1636 size *= (sizeof (bfd_signed_vma)
1637 + sizeof (bfd_vma) + sizeof(char));
1638 local_got_refcounts = (bfd_signed_vma *)
1639 bfd_zalloc (abfd, size);
1640 if (local_got_refcounts == NULL)
1642 elf_local_got_refcounts (abfd) = local_got_refcounts;
1643 elf_i386_local_tlsdesc_gotent (abfd)
1644 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1645 elf_i386_local_got_tls_type (abfd)
1646 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1648 local_got_refcounts[r_symndx] += 1;
1649 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1652 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1653 tls_type |= old_tls_type;
1654 /* If a TLS symbol is accessed using IE at least once,
1655 there is no point to use dynamic model for it. */
1656 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1657 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1658 || (tls_type & GOT_TLS_IE) == 0))
1660 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1661 tls_type = old_tls_type;
1662 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1663 && GOT_TLS_GD_ANY_P (tls_type))
1664 tls_type |= old_tls_type;
1668 name = h->root.root.string;
1670 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1672 (*_bfd_error_handler)
1673 (_("%B: `%s' accessed both as normal and "
1674 "thread local symbol"),
1676 bfd_set_error (bfd_error_bad_value);
1681 if (old_tls_type != tls_type)
1684 elf_i386_hash_entry (h)->tls_type = tls_type;
1686 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1694 if (htab->elf.sgot == NULL)
1696 if (htab->elf.dynobj == NULL)
1697 htab->elf.dynobj = abfd;
1698 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1701 if (r_type != R_386_TLS_IE)
1705 case R_386_TLS_LE_32:
1707 if (info->executable)
1709 info->flags |= DF_STATIC_TLS;
1714 if (h != NULL && info->executable)
1716 /* If this reloc is in a read-only section, we might
1717 need a copy reloc. We can't check reliably at this
1718 stage whether the section is read-only, as input
1719 sections have not yet been mapped to output sections.
1720 Tentatively set the flag for now, and correct in
1721 adjust_dynamic_symbol. */
1724 /* We may need a .plt entry if the function this reloc
1725 refers to is in a shared lib. */
1726 h->plt.refcount += 1;
1727 if (r_type != R_386_PC32)
1728 h->pointer_equality_needed = 1;
1733 /* If we are creating a shared library, and this is a reloc
1734 against a global symbol, or a non PC relative reloc
1735 against a local symbol, then we need to copy the reloc
1736 into the shared library. However, if we are linking with
1737 -Bsymbolic, we do not need to copy a reloc against a
1738 global symbol which is defined in an object we are
1739 including in the link (i.e., DEF_REGULAR is set). At
1740 this point we have not seen all the input files, so it is
1741 possible that DEF_REGULAR is not set now but will be set
1742 later (it is never cleared). In case of a weak definition,
1743 DEF_REGULAR may be cleared later by a strong definition in
1744 a shared library. We account for that possibility below by
1745 storing information in the relocs_copied field of the hash
1746 table entry. A similar situation occurs when creating
1747 shared libraries and symbol visibility changes render the
1750 If on the other hand, we are creating an executable, we
1751 may need to keep relocations for symbols satisfied by a
1752 dynamic library if we manage to avoid copy relocs for the
1755 && (sec->flags & SEC_ALLOC) != 0
1756 && (r_type != R_386_PC32
1758 && (! SYMBOLIC_BIND (info, h)
1759 || h->root.type == bfd_link_hash_defweak
1760 || !h->def_regular))))
1761 || (ELIMINATE_COPY_RELOCS
1763 && (sec->flags & SEC_ALLOC) != 0
1765 && (h->root.type == bfd_link_hash_defweak
1766 || !h->def_regular)))
1768 struct elf_dyn_relocs *p;
1769 struct elf_dyn_relocs **head;
1771 /* We must copy these reloc types into the output file.
1772 Create a reloc section in dynobj and make room for
1776 if (htab->elf.dynobj == NULL)
1777 htab->elf.dynobj = abfd;
1779 sreloc = _bfd_elf_make_dynamic_reloc_section
1780 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1786 /* If this is a global symbol, we count the number of
1787 relocations we need for this symbol. */
1790 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1794 /* Track dynamic relocs needed for local syms too.
1795 We really need local syms available to do this
1800 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1805 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1809 vpp = &elf_section_data (s)->local_dynrel;
1810 head = (struct elf_dyn_relocs **)vpp;
1814 if (p == NULL || p->sec != sec)
1816 bfd_size_type amt = sizeof *p;
1817 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1829 /* Count size relocation as PC-relative relocation. */
1830 if (r_type == R_386_PC32 || size_reloc)
1835 /* This relocation describes the C++ object vtable hierarchy.
1836 Reconstruct it for later use during GC. */
1837 case R_386_GNU_VTINHERIT:
1838 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1842 /* This relocation describes which C++ vtable entries are actually
1843 used. Record for later use during GC. */
1844 case R_386_GNU_VTENTRY:
1845 BFD_ASSERT (h != NULL);
1847 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1857 && h->plt.refcount > 0
1858 && h->got.refcount > 0
1859 && htab->plt_got == NULL)
1861 /* Create the GOT procedure linkage table. */
1862 unsigned int plt_got_align;
1863 const struct elf_backend_data *bed;
1865 bed = get_elf_backend_data (info->output_bfd);
1866 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1867 && (sizeof (elf_i386_got_plt_entry)
1868 == sizeof (elf_i386_pic_got_plt_entry)));
1871 if (htab->elf.dynobj == NULL)
1872 htab->elf.dynobj = abfd;
1874 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1876 (bed->dynamic_sec_flags
1881 if (htab->plt_got == NULL
1882 || !bfd_set_section_alignment (htab->elf.dynobj,
1892 /* Return the section that should be marked against GC for a given
1896 elf_i386_gc_mark_hook (asection *sec,
1897 struct bfd_link_info *info,
1898 Elf_Internal_Rela *rel,
1899 struct elf_link_hash_entry *h,
1900 Elf_Internal_Sym *sym)
1903 switch (ELF32_R_TYPE (rel->r_info))
1905 case R_386_GNU_VTINHERIT:
1906 case R_386_GNU_VTENTRY:
1910 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1913 /* Update the got entry reference counts for the section being removed. */
1916 elf_i386_gc_sweep_hook (bfd *abfd,
1917 struct bfd_link_info *info,
1919 const Elf_Internal_Rela *relocs)
1921 struct elf_i386_link_hash_table *htab;
1922 Elf_Internal_Shdr *symtab_hdr;
1923 struct elf_link_hash_entry **sym_hashes;
1924 bfd_signed_vma *local_got_refcounts;
1925 const Elf_Internal_Rela *rel, *relend;
1927 if (info->relocatable)
1930 htab = elf_i386_hash_table (info);
1934 elf_section_data (sec)->local_dynrel = NULL;
1936 symtab_hdr = &elf_symtab_hdr (abfd);
1937 sym_hashes = elf_sym_hashes (abfd);
1938 local_got_refcounts = elf_local_got_refcounts (abfd);
1940 relend = relocs + sec->reloc_count;
1941 for (rel = relocs; rel < relend; rel++)
1943 unsigned long r_symndx;
1944 unsigned int r_type;
1945 struct elf_link_hash_entry *h = NULL;
1947 r_symndx = ELF32_R_SYM (rel->r_info);
1948 if (r_symndx >= symtab_hdr->sh_info)
1950 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1951 while (h->root.type == bfd_link_hash_indirect
1952 || h->root.type == bfd_link_hash_warning)
1953 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1957 /* A local symbol. */
1958 Elf_Internal_Sym *isym;
1960 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1963 /* Check relocation against local STT_GNU_IFUNC symbol. */
1965 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1967 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1975 struct elf_i386_link_hash_entry *eh;
1976 struct elf_dyn_relocs **pp;
1977 struct elf_dyn_relocs *p;
1979 eh = (struct elf_i386_link_hash_entry *) h;
1980 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1983 /* Everything must go for SEC. */
1989 r_type = ELF32_R_TYPE (rel->r_info);
1990 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1991 symtab_hdr, sym_hashes,
1992 &r_type, GOT_UNKNOWN,
1993 rel, relend, h, r_symndx))
1999 if (htab->tls_ldm_got.refcount > 0)
2000 htab->tls_ldm_got.refcount -= 1;
2004 case R_386_TLS_GOTDESC:
2005 case R_386_TLS_DESC_CALL:
2006 case R_386_TLS_IE_32:
2008 case R_386_TLS_GOTIE:
2012 if (h->got.refcount > 0)
2013 h->got.refcount -= 1;
2014 if (h->type == STT_GNU_IFUNC)
2016 if (h->plt.refcount > 0)
2017 h->plt.refcount -= 1;
2020 else if (local_got_refcounts != NULL)
2022 if (local_got_refcounts[r_symndx] > 0)
2023 local_got_refcounts[r_symndx] -= 1;
2031 && (h == NULL || h->type != STT_GNU_IFUNC))
2038 if (h->plt.refcount > 0)
2039 h->plt.refcount -= 1;
2044 if (h != NULL && h->type == STT_GNU_IFUNC)
2046 if (h->got.refcount > 0)
2047 h->got.refcount -= 1;
2048 if (h->plt.refcount > 0)
2049 h->plt.refcount -= 1;
2061 /* Adjust a symbol defined by a dynamic object and referenced by a
2062 regular object. The current definition is in some section of the
2063 dynamic object, but we're not including those sections. We have to
2064 change the definition to something the rest of the link can
2068 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2069 struct elf_link_hash_entry *h)
2071 struct elf_i386_link_hash_table *htab;
2073 struct elf_i386_link_hash_entry *eh;
2074 struct elf_dyn_relocs *p;
2076 /* STT_GNU_IFUNC symbol must go through PLT. */
2077 if (h->type == STT_GNU_IFUNC)
2079 /* All local STT_GNU_IFUNC references must be treate as local
2080 calls via local PLT. */
2082 && SYMBOL_CALLS_LOCAL (info, h))
2084 bfd_size_type pc_count = 0, count = 0;
2085 struct elf_dyn_relocs **pp;
2087 eh = (struct elf_i386_link_hash_entry *) h;
2088 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2090 pc_count += p->pc_count;
2091 p->count -= p->pc_count;
2100 if (pc_count || count)
2104 if (h->plt.refcount <= 0)
2105 h->plt.refcount = 1;
2107 h->plt.refcount += 1;
2111 if (h->plt.refcount <= 0)
2113 h->plt.offset = (bfd_vma) -1;
2119 /* If this is a function, put it in the procedure linkage table. We
2120 will fill in the contents of the procedure linkage table later,
2121 when we know the address of the .got section. */
2122 if (h->type == STT_FUNC
2125 if (h->plt.refcount <= 0
2126 || SYMBOL_CALLS_LOCAL (info, h)
2127 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2128 && h->root.type == bfd_link_hash_undefweak))
2130 /* This case can occur if we saw a PLT32 reloc in an input
2131 file, but the symbol was never referred to by a dynamic
2132 object, or if all references were garbage collected. In
2133 such a case, we don't actually need to build a procedure
2134 linkage table, and we can just do a PC32 reloc instead. */
2135 h->plt.offset = (bfd_vma) -1;
2142 /* It's possible that we incorrectly decided a .plt reloc was
2143 needed for an R_386_PC32 reloc to a non-function sym in
2144 check_relocs. We can't decide accurately between function and
2145 non-function syms in check-relocs; Objects loaded later in
2146 the link may change h->type. So fix it now. */
2147 h->plt.offset = (bfd_vma) -1;
2149 /* If this is a weak symbol, and there is a real definition, the
2150 processor independent code will have arranged for us to see the
2151 real definition first, and we can just use the same value. */
2152 if (h->u.weakdef != NULL)
2154 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2155 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2156 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2157 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2158 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2159 h->non_got_ref = h->u.weakdef->non_got_ref;
2163 /* This is a reference to a symbol defined by a dynamic object which
2164 is not a function. */
2166 /* If we are creating a shared library, we must presume that the
2167 only references to the symbol are via the global offset table.
2168 For such cases we need not do anything here; the relocations will
2169 be handled correctly by relocate_section. */
2173 /* If there are no references to this symbol that do not use the
2174 GOT, we don't need to generate a copy reloc. */
2175 if (!h->non_got_ref)
2178 /* If -z nocopyreloc was given, we won't generate them either. */
2179 if (info->nocopyreloc)
2185 htab = elf_i386_hash_table (info);
2189 /* If there aren't any dynamic relocs in read-only sections, then
2190 we can keep the dynamic relocs and avoid the copy reloc. This
2191 doesn't work on VxWorks, where we can not have dynamic relocations
2192 (other than copy and jump slot relocations) in an executable. */
2193 if (ELIMINATE_COPY_RELOCS
2194 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2196 eh = (struct elf_i386_link_hash_entry *) h;
2197 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2199 s = p->sec->output_section;
2200 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2211 /* We must allocate the symbol in our .dynbss section, which will
2212 become part of the .bss section of the executable. There will be
2213 an entry for this symbol in the .dynsym section. The dynamic
2214 object will contain position independent code, so all references
2215 from the dynamic object to this symbol will go through the global
2216 offset table. The dynamic linker will use the .dynsym entry to
2217 determine the address it must put in the global offset table, so
2218 both the dynamic object and the regular object will refer to the
2219 same memory location for the variable. */
2221 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2222 copy the initial value out of the dynamic object and into the
2223 runtime process image. */
2224 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2226 htab->srelbss->size += sizeof (Elf32_External_Rel);
2232 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2235 /* Allocate space in .plt, .got and associated reloc sections for
2239 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2241 struct bfd_link_info *info;
2242 struct elf_i386_link_hash_table *htab;
2243 struct elf_i386_link_hash_entry *eh;
2244 struct elf_dyn_relocs *p;
2245 unsigned plt_entry_size;
2247 if (h->root.type == bfd_link_hash_indirect)
2250 eh = (struct elf_i386_link_hash_entry *) h;
2252 info = (struct bfd_link_info *) inf;
2253 htab = elf_i386_hash_table (info);
2257 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2259 /* We can't use the GOT PLT if pointer equality is needed since
2260 finish_dynamic_symbol won't clear symbol value and the dynamic
2261 linker won't update the GOT slot. We will get into an infinite
2262 loop at run-time. */
2263 if (htab->plt_got != NULL
2264 && h->type != STT_GNU_IFUNC
2265 && !h->pointer_equality_needed
2266 && h->plt.refcount > 0
2267 && h->got.refcount > 0)
2269 /* Don't use the regular PLT if there are both GOT and GOTPLT
2271 h->plt.offset = (bfd_vma) -1;
2273 /* Use the GOT PLT. */
2274 eh->plt_got.refcount = 1;
2277 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2278 here if it is defined and referenced in a non-shared object. */
2279 if (h->type == STT_GNU_IFUNC
2281 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2284 else if (htab->elf.dynamic_sections_created
2285 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2287 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2289 /* Make sure this symbol is output as a dynamic symbol.
2290 Undefined weak syms won't yet be marked as dynamic. */
2291 if (h->dynindx == -1
2292 && !h->forced_local)
2294 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2299 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2301 asection *s = htab->elf.splt;
2302 asection *got_s = htab->plt_got;
2304 /* If this is the first .plt entry, make room for the special
2307 s->size = plt_entry_size;
2310 eh->plt_got.offset = got_s->size;
2312 h->plt.offset = s->size;
2314 /* If this symbol is not defined in a regular file, and we are
2315 not generating a shared library, then set the symbol to this
2316 location in the .plt. This is required to make function
2317 pointers compare as equal between the normal executable and
2318 the shared library. */
2324 /* We need to make a call to the entry of the GOT PLT
2325 instead of regular PLT entry. */
2326 h->root.u.def.section = got_s;
2327 h->root.u.def.value = eh->plt_got.offset;
2331 h->root.u.def.section = s;
2332 h->root.u.def.value = h->plt.offset;
2336 /* Make room for this entry. */
2338 got_s->size += sizeof (elf_i386_got_plt_entry);
2341 s->size += plt_entry_size;
2343 /* We also need to make an entry in the .got.plt section,
2344 which will be placed in the .got section by the linker
2346 htab->elf.sgotplt->size += 4;
2348 /* We also need to make an entry in the .rel.plt section. */
2349 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2350 htab->elf.srelplt->reloc_count++;
2353 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2356 /* VxWorks has a second set of relocations for each PLT entry
2357 in executables. They go in a separate relocation section,
2358 which is processed by the kernel loader. */
2360 /* There are two relocations for the initial PLT entry: an
2361 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2362 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2364 if (h->plt.offset == plt_entry_size)
2365 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2367 /* There are two extra relocations for each subsequent PLT entry:
2368 an R_386_32 relocation for the GOT entry, and an R_386_32
2369 relocation for the PLT entry. */
2371 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2376 h->plt.offset = (bfd_vma) -1;
2382 h->plt.offset = (bfd_vma) -1;
2386 eh->tlsdesc_got = (bfd_vma) -1;
2388 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2389 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2390 if (h->got.refcount > 0
2393 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2394 h->got.offset = (bfd_vma) -1;
2395 else if (h->got.refcount > 0)
2399 int tls_type = elf_i386_hash_entry(h)->tls_type;
2401 /* Make sure this symbol is output as a dynamic symbol.
2402 Undefined weak syms won't yet be marked as dynamic. */
2403 if (h->dynindx == -1
2404 && !h->forced_local)
2406 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2411 if (GOT_TLS_GDESC_P (tls_type))
2413 eh->tlsdesc_got = htab->elf.sgotplt->size
2414 - elf_i386_compute_jump_table_size (htab);
2415 htab->elf.sgotplt->size += 8;
2416 h->got.offset = (bfd_vma) -2;
2418 if (! GOT_TLS_GDESC_P (tls_type)
2419 || GOT_TLS_GD_P (tls_type))
2421 h->got.offset = s->size;
2423 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2424 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2427 dyn = htab->elf.dynamic_sections_created;
2428 /* R_386_TLS_IE_32 needs one dynamic relocation,
2429 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2430 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2431 need two), R_386_TLS_GD needs one if local symbol and two if
2433 if (tls_type == GOT_TLS_IE_BOTH)
2434 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2435 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2436 || (tls_type & GOT_TLS_IE))
2437 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2438 else if (GOT_TLS_GD_P (tls_type))
2439 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2440 else if (! GOT_TLS_GDESC_P (tls_type)
2441 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2442 || h->root.type != bfd_link_hash_undefweak)
2444 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2445 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2446 if (GOT_TLS_GDESC_P (tls_type))
2447 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2450 h->got.offset = (bfd_vma) -1;
2452 if (eh->dyn_relocs == NULL)
2455 /* In the shared -Bsymbolic case, discard space allocated for
2456 dynamic pc-relative relocs against symbols which turn out to be
2457 defined in regular objects. For the normal shared case, discard
2458 space for pc-relative relocs that have become local due to symbol
2459 visibility changes. */
2463 /* The only reloc that uses pc_count is R_386_PC32, which will
2464 appear on a call or on something like ".long foo - .". We
2465 want calls to protected symbols to resolve directly to the
2466 function rather than going via the plt. If people want
2467 function pointer comparisons to work as expected then they
2468 should avoid writing assembly like ".long foo - .". */
2469 if (SYMBOL_CALLS_LOCAL (info, h))
2471 struct elf_dyn_relocs **pp;
2473 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2475 p->count -= p->pc_count;
2484 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2486 struct elf_dyn_relocs **pp;
2487 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2489 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2496 /* Also discard relocs on undefined weak syms with non-default
2498 if (eh->dyn_relocs != NULL
2499 && h->root.type == bfd_link_hash_undefweak)
2501 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2502 eh->dyn_relocs = NULL;
2504 /* Make sure undefined weak symbols are output as a dynamic
2506 else if (h->dynindx == -1
2507 && !h->forced_local)
2509 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2514 else if (ELIMINATE_COPY_RELOCS)
2516 /* For the non-shared case, discard space for relocs against
2517 symbols which turn out to need copy relocs or are not
2523 || (htab->elf.dynamic_sections_created
2524 && (h->root.type == bfd_link_hash_undefweak
2525 || h->root.type == bfd_link_hash_undefined))))
2527 /* Make sure this symbol is output as a dynamic symbol.
2528 Undefined weak syms won't yet be marked as dynamic. */
2529 if (h->dynindx == -1
2530 && !h->forced_local)
2532 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2536 /* If that succeeded, we know we'll be keeping all the
2538 if (h->dynindx != -1)
2542 eh->dyn_relocs = NULL;
2547 /* Finally, allocate space. */
2548 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2552 sreloc = elf_section_data (p->sec)->sreloc;
2554 BFD_ASSERT (sreloc != NULL);
2555 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2561 /* Allocate space in .plt, .got and associated reloc sections for
2562 local dynamic relocs. */
2565 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2567 struct elf_link_hash_entry *h
2568 = (struct elf_link_hash_entry *) *slot;
2570 if (h->type != STT_GNU_IFUNC
2574 || h->root.type != bfd_link_hash_defined)
2577 return elf_i386_allocate_dynrelocs (h, inf);
2580 /* Find any dynamic relocs that apply to read-only sections. */
2583 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2585 struct elf_i386_link_hash_entry *eh;
2586 struct elf_dyn_relocs *p;
2588 /* Skip local IFUNC symbols. */
2589 if (h->forced_local && h->type == STT_GNU_IFUNC)
2592 eh = (struct elf_i386_link_hash_entry *) h;
2593 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2595 asection *s = p->sec->output_section;
2597 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2599 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2601 info->flags |= DF_TEXTREL;
2603 if (info->warn_shared_textrel && info->shared)
2604 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2605 p->sec->owner, h->root.root.string,
2608 /* Not an error, just cut short the traversal. */
2616 mov foo@GOT(%reg), %reg
2618 lea foo@GOTOFF(%reg), %reg
2619 with the local symbol, foo. */
2622 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2623 struct bfd_link_info *link_info)
2625 Elf_Internal_Shdr *symtab_hdr;
2626 Elf_Internal_Rela *internal_relocs;
2627 Elf_Internal_Rela *irel, *irelend;
2629 struct elf_i386_link_hash_table *htab;
2630 bfd_boolean changed_contents;
2631 bfd_boolean changed_relocs;
2632 bfd_signed_vma *local_got_refcounts;
2634 /* Don't even try to convert non-ELF outputs. */
2635 if (!is_elf_hash_table (link_info->hash))
2638 /* Nothing to do if there are no codes, no relocations or no output. */
2639 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2640 || sec->reloc_count == 0
2641 || bfd_is_abs_section (sec->output_section))
2644 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2646 /* Load the relocations for this section. */
2647 internal_relocs = (_bfd_elf_link_read_relocs
2648 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2649 link_info->keep_memory));
2650 if (internal_relocs == NULL)
2653 htab = elf_i386_hash_table (link_info);
2654 changed_contents = FALSE;
2655 changed_relocs = FALSE;
2656 local_got_refcounts = elf_local_got_refcounts (abfd);
2658 /* Get the section contents. */
2659 if (elf_section_data (sec)->this_hdr.contents != NULL)
2660 contents = elf_section_data (sec)->this_hdr.contents;
2663 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2667 irelend = internal_relocs + sec->reloc_count;
2668 for (irel = internal_relocs; irel < irelend; irel++)
2670 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2671 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2673 struct elf_link_hash_entry *h;
2675 if (r_type != R_386_GOT32)
2678 /* Get the symbol referred to by the reloc. */
2679 if (r_symndx < symtab_hdr->sh_info)
2681 Elf_Internal_Sym *isym;
2683 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2686 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2687 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2688 && irel->r_offset >= 2
2689 && bfd_get_8 (input_bfd,
2690 contents + irel->r_offset - 2) == 0x8b)
2692 bfd_put_8 (output_bfd, 0x8d,
2693 contents + irel->r_offset - 2);
2694 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2695 if (local_got_refcounts != NULL
2696 && local_got_refcounts[r_symndx] > 0)
2697 local_got_refcounts[r_symndx] -= 1;
2698 changed_contents = TRUE;
2699 changed_relocs = TRUE;
2704 indx = r_symndx - symtab_hdr->sh_info;
2705 h = elf_sym_hashes (abfd)[indx];
2706 BFD_ASSERT (h != NULL);
2708 while (h->root.type == bfd_link_hash_indirect
2709 || h->root.type == bfd_link_hash_warning)
2710 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2712 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2713 optimizing _DYNAMIC since ld.so may use its link-time address. */
2715 && h->type != STT_GNU_IFUNC
2716 && h != htab->elf.hdynamic
2717 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2718 && irel->r_offset >= 2
2719 && bfd_get_8 (input_bfd,
2720 contents + irel->r_offset - 2) == 0x8b)
2722 bfd_put_8 (output_bfd, 0x8d,
2723 contents + irel->r_offset - 2);
2724 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2725 if (h->got.refcount > 0)
2726 h->got.refcount -= 1;
2727 changed_contents = TRUE;
2728 changed_relocs = TRUE;
2732 if (contents != NULL
2733 && elf_section_data (sec)->this_hdr.contents != contents)
2735 if (!changed_contents && !link_info->keep_memory)
2739 /* Cache the section contents for elf_link_input_bfd. */
2740 elf_section_data (sec)->this_hdr.contents = contents;
2744 if (elf_section_data (sec)->relocs != internal_relocs)
2746 if (!changed_relocs)
2747 free (internal_relocs);
2749 elf_section_data (sec)->relocs = internal_relocs;
2755 if (contents != NULL
2756 && elf_section_data (sec)->this_hdr.contents != contents)
2758 if (internal_relocs != NULL
2759 && elf_section_data (sec)->relocs != internal_relocs)
2760 free (internal_relocs);
2764 /* Set the sizes of the dynamic sections. */
2767 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2769 struct elf_i386_link_hash_table *htab;
2775 htab = elf_i386_hash_table (info);
2778 dynobj = htab->elf.dynobj;
2782 if (htab->elf.dynamic_sections_created)
2784 /* Set the contents of the .interp section to the interpreter. */
2785 if (info->executable)
2787 s = bfd_get_linker_section (dynobj, ".interp");
2790 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2791 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2795 /* Set up .got offsets for local syms, and space for local dynamic
2797 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2799 bfd_signed_vma *local_got;
2800 bfd_signed_vma *end_local_got;
2801 char *local_tls_type;
2802 bfd_vma *local_tlsdesc_gotent;
2803 bfd_size_type locsymcount;
2804 Elf_Internal_Shdr *symtab_hdr;
2807 if (! is_i386_elf (ibfd))
2810 for (s = ibfd->sections; s != NULL; s = s->next)
2812 struct elf_dyn_relocs *p;
2814 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2817 for (p = ((struct elf_dyn_relocs *)
2818 elf_section_data (s)->local_dynrel);
2822 if (!bfd_is_abs_section (p->sec)
2823 && bfd_is_abs_section (p->sec->output_section))
2825 /* Input section has been discarded, either because
2826 it is a copy of a linkonce section or due to
2827 linker script /DISCARD/, so we'll be discarding
2830 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2831 && strcmp (p->sec->output_section->name,
2834 /* Relocations in vxworks .tls_vars sections are
2835 handled specially by the loader. */
2837 else if (p->count != 0)
2839 srel = elf_section_data (p->sec)->sreloc;
2840 srel->size += p->count * sizeof (Elf32_External_Rel);
2841 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2842 && (info->flags & DF_TEXTREL) == 0)
2844 info->flags |= DF_TEXTREL;
2845 if (info->warn_shared_textrel && info->shared)
2846 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2847 p->sec->owner, p->sec);
2853 local_got = elf_local_got_refcounts (ibfd);
2857 symtab_hdr = &elf_symtab_hdr (ibfd);
2858 locsymcount = symtab_hdr->sh_info;
2859 end_local_got = local_got + locsymcount;
2860 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2861 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2863 srel = htab->elf.srelgot;
2864 for (; local_got < end_local_got;
2865 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2867 *local_tlsdesc_gotent = (bfd_vma) -1;
2870 if (GOT_TLS_GDESC_P (*local_tls_type))
2872 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2873 - elf_i386_compute_jump_table_size (htab);
2874 htab->elf.sgotplt->size += 8;
2875 *local_got = (bfd_vma) -2;
2877 if (! GOT_TLS_GDESC_P (*local_tls_type)
2878 || GOT_TLS_GD_P (*local_tls_type))
2880 *local_got = s->size;
2882 if (GOT_TLS_GD_P (*local_tls_type)
2883 || *local_tls_type == GOT_TLS_IE_BOTH)
2887 || GOT_TLS_GD_ANY_P (*local_tls_type)
2888 || (*local_tls_type & GOT_TLS_IE))
2890 if (*local_tls_type == GOT_TLS_IE_BOTH)
2891 srel->size += 2 * sizeof (Elf32_External_Rel);
2892 else if (GOT_TLS_GD_P (*local_tls_type)
2893 || ! GOT_TLS_GDESC_P (*local_tls_type))
2894 srel->size += sizeof (Elf32_External_Rel);
2895 if (GOT_TLS_GDESC_P (*local_tls_type))
2896 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2900 *local_got = (bfd_vma) -1;
2904 if (htab->tls_ldm_got.refcount > 0)
2906 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2908 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2909 htab->elf.sgot->size += 8;
2910 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2913 htab->tls_ldm_got.offset = -1;
2915 /* Allocate global sym .plt and .got entries, and space for global
2916 sym dynamic relocs. */
2917 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2919 /* Allocate .plt and .got entries, and space for local symbols. */
2920 htab_traverse (htab->loc_hash_table,
2921 elf_i386_allocate_local_dynrelocs,
2924 /* For every jump slot reserved in the sgotplt, reloc_count is
2925 incremented. However, when we reserve space for TLS descriptors,
2926 it's not incremented, so in order to compute the space reserved
2927 for them, it suffices to multiply the reloc count by the jump
2930 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2931 so that R_386_IRELATIVE entries come last. */
2932 if (htab->elf.srelplt)
2934 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2935 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2936 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2938 else if (htab->elf.irelplt)
2939 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2942 if (htab->elf.sgotplt)
2944 /* Don't allocate .got.plt section if there are no GOT nor PLT
2945 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2946 if ((htab->elf.hgot == NULL
2947 || !htab->elf.hgot->ref_regular_nonweak)
2948 && (htab->elf.sgotplt->size
2949 == get_elf_backend_data (output_bfd)->got_header_size)
2950 && (htab->elf.splt == NULL
2951 || htab->elf.splt->size == 0)
2952 && (htab->elf.sgot == NULL
2953 || htab->elf.sgot->size == 0)
2954 && (htab->elf.iplt == NULL
2955 || htab->elf.iplt->size == 0)
2956 && (htab->elf.igotplt == NULL
2957 || htab->elf.igotplt->size == 0))
2958 htab->elf.sgotplt->size = 0;
2962 if (htab->plt_eh_frame != NULL
2963 && htab->elf.splt != NULL
2964 && htab->elf.splt->size != 0
2965 && !bfd_is_abs_section (htab->elf.splt->output_section)
2966 && _bfd_elf_eh_frame_present (info))
2967 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2969 /* We now have determined the sizes of the various dynamic sections.
2970 Allocate memory for them. */
2972 for (s = dynobj->sections; s != NULL; s = s->next)
2974 bfd_boolean strip_section = TRUE;
2976 if ((s->flags & SEC_LINKER_CREATED) == 0)
2979 if (s == htab->elf.splt
2980 || s == htab->elf.sgot)
2982 /* Strip this section if we don't need it; see the
2984 /* We'd like to strip these sections if they aren't needed, but if
2985 we've exported dynamic symbols from them we must leave them.
2986 It's too late to tell BFD to get rid of the symbols. */
2988 if (htab->elf.hplt != NULL)
2989 strip_section = FALSE;
2991 else if (s == htab->elf.sgotplt
2992 || s == htab->elf.iplt
2993 || s == htab->elf.igotplt
2994 || s == htab->plt_got
2995 || s == htab->plt_eh_frame
2996 || s == htab->sdynbss)
2998 /* Strip these too. */
3000 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3003 && s != htab->elf.srelplt
3004 && s != htab->srelplt2)
3007 /* We use the reloc_count field as a counter if we need
3008 to copy relocs into the output file. */
3013 /* It's not one of our sections, so don't allocate space. */
3019 /* If we don't need this section, strip it from the
3020 output file. This is mostly to handle .rel.bss and
3021 .rel.plt. We must create both sections in
3022 create_dynamic_sections, because they must be created
3023 before the linker maps input sections to output
3024 sections. The linker does that before
3025 adjust_dynamic_symbol is called, and it is that
3026 function which decides whether anything needs to go
3027 into these sections. */
3029 s->flags |= SEC_EXCLUDE;
3033 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3036 /* Allocate memory for the section contents. We use bfd_zalloc
3037 here in case unused entries are not reclaimed before the
3038 section's contents are written out. This should not happen,
3039 but this way if it does, we get a R_386_NONE reloc instead
3041 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3042 if (s->contents == NULL)
3046 if (htab->plt_eh_frame != NULL
3047 && htab->plt_eh_frame->contents != NULL)
3049 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3050 sizeof (elf_i386_eh_frame_plt));
3051 bfd_put_32 (dynobj, htab->elf.splt->size,
3052 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3055 if (htab->elf.dynamic_sections_created)
3057 /* Add some entries to the .dynamic section. We fill in the
3058 values later, in elf_i386_finish_dynamic_sections, but we
3059 must add the entries now so that we get the correct size for
3060 the .dynamic section. The DT_DEBUG entry is filled in by the
3061 dynamic linker and used by the debugger. */
3062 #define add_dynamic_entry(TAG, VAL) \
3063 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3065 if (info->executable)
3067 if (!add_dynamic_entry (DT_DEBUG, 0))
3071 if (htab->elf.splt->size != 0)
3073 if (!add_dynamic_entry (DT_PLTGOT, 0)
3074 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3075 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3076 || !add_dynamic_entry (DT_JMPREL, 0))
3082 if (!add_dynamic_entry (DT_REL, 0)
3083 || !add_dynamic_entry (DT_RELSZ, 0)
3084 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3087 /* If any dynamic relocs apply to a read-only section,
3088 then we need a DT_TEXTREL entry. */
3089 if ((info->flags & DF_TEXTREL) == 0)
3090 elf_link_hash_traverse (&htab->elf,
3091 elf_i386_readonly_dynrelocs, info);
3093 if ((info->flags & DF_TEXTREL) != 0)
3095 if (!add_dynamic_entry (DT_TEXTREL, 0))
3099 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3100 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3103 #undef add_dynamic_entry
3109 elf_i386_always_size_sections (bfd *output_bfd,
3110 struct bfd_link_info *info)
3112 asection *tls_sec = elf_hash_table (info)->tls_sec;
3116 struct elf_link_hash_entry *tlsbase;
3118 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3119 "_TLS_MODULE_BASE_",
3120 FALSE, FALSE, FALSE);
3122 if (tlsbase && tlsbase->type == STT_TLS)
3124 struct elf_i386_link_hash_table *htab;
3125 struct bfd_link_hash_entry *bh = NULL;
3126 const struct elf_backend_data *bed
3127 = get_elf_backend_data (output_bfd);
3129 htab = elf_i386_hash_table (info);
3133 if (!(_bfd_generic_link_add_one_symbol
3134 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3135 tls_sec, 0, NULL, FALSE,
3136 bed->collect, &bh)))
3139 htab->tls_module_base = bh;
3141 tlsbase = (struct elf_link_hash_entry *)bh;
3142 tlsbase->def_regular = 1;
3143 tlsbase->other = STV_HIDDEN;
3144 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3151 /* Set the correct type for an x86 ELF section. We do this by the
3152 section name, which is a hack, but ought to work. */
3155 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3156 Elf_Internal_Shdr *hdr,
3161 name = bfd_get_section_name (abfd, sec);
3163 /* This is an ugly, but unfortunately necessary hack that is
3164 needed when producing EFI binaries on x86. It tells
3165 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3166 containing ELF relocation info. We need this hack in order to
3167 be able to generate ELF binaries that can be translated into
3168 EFI applications (which are essentially COFF objects). Those
3169 files contain a COFF ".reloc" section inside an ELFNN object,
3170 which would normally cause BFD to segfault because it would
3171 attempt to interpret this section as containing relocation
3172 entries for section "oc". With this hack enabled, ".reloc"
3173 will be treated as a normal data section, which will avoid the
3174 segfault. However, you won't be able to create an ELFNN binary
3175 with a section named "oc" that needs relocations, but that's
3176 the kind of ugly side-effects you get when detecting section
3177 types based on their names... In practice, this limitation is
3178 unlikely to bite. */
3179 if (strcmp (name, ".reloc") == 0)
3180 hdr->sh_type = SHT_PROGBITS;
3185 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3186 executables. Rather than setting it to the beginning of the TLS
3187 section, we have to set it to the end. This function may be called
3188 multiple times, it is idempotent. */
3191 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3193 struct elf_i386_link_hash_table *htab;
3194 struct bfd_link_hash_entry *base;
3196 if (!info->executable)
3199 htab = elf_i386_hash_table (info);
3203 base = htab->tls_module_base;
3207 base->u.def.value = htab->elf.tls_size;
3210 /* Return the base VMA address which should be subtracted from real addresses
3211 when resolving @dtpoff relocation.
3212 This is PT_TLS segment p_vaddr. */
3215 elf_i386_dtpoff_base (struct bfd_link_info *info)
3217 /* If tls_sec is NULL, we should have signalled an error already. */
3218 if (elf_hash_table (info)->tls_sec == NULL)
3220 return elf_hash_table (info)->tls_sec->vma;
3223 /* Return the relocation value for @tpoff relocation
3224 if STT_TLS virtual address is ADDRESS. */
3227 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3229 struct elf_link_hash_table *htab = elf_hash_table (info);
3230 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3231 bfd_vma static_tls_size;
3233 /* If tls_sec is NULL, we should have signalled an error already. */
3234 if (htab->tls_sec == NULL)
3237 /* Consider special static TLS alignment requirements. */
3238 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3239 return static_tls_size + htab->tls_sec->vma - address;
3242 /* Relocate an i386 ELF section. */
3245 elf_i386_relocate_section (bfd *output_bfd,
3246 struct bfd_link_info *info,
3248 asection *input_section,
3250 Elf_Internal_Rela *relocs,
3251 Elf_Internal_Sym *local_syms,
3252 asection **local_sections)
3254 struct elf_i386_link_hash_table *htab;
3255 Elf_Internal_Shdr *symtab_hdr;
3256 struct elf_link_hash_entry **sym_hashes;
3257 bfd_vma *local_got_offsets;
3258 bfd_vma *local_tlsdesc_gotents;
3259 Elf_Internal_Rela *rel;
3260 Elf_Internal_Rela *relend;
3261 bfd_boolean is_vxworks_tls;
3262 unsigned plt_entry_size;
3264 BFD_ASSERT (is_i386_elf (input_bfd));
3266 htab = elf_i386_hash_table (info);
3269 symtab_hdr = &elf_symtab_hdr (input_bfd);
3270 sym_hashes = elf_sym_hashes (input_bfd);
3271 local_got_offsets = elf_local_got_offsets (input_bfd);
3272 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3273 /* We have to handle relocations in vxworks .tls_vars sections
3274 specially, because the dynamic loader is 'weird'. */
3275 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3277 && !strcmp (input_section->output_section->name,
3280 elf_i386_set_tls_module_base (info);
3282 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3285 relend = relocs + input_section->reloc_count;
3286 for (; rel < relend; rel++)
3288 unsigned int r_type;
3289 reloc_howto_type *howto;
3290 unsigned long r_symndx;
3291 struct elf_link_hash_entry *h;
3292 struct elf_i386_link_hash_entry *eh;
3293 Elf_Internal_Sym *sym;
3295 bfd_vma off, offplt, plt_offset;
3297 bfd_boolean unresolved_reloc;
3298 bfd_reloc_status_type r;
3302 asection *resolved_plt;
3304 r_type = ELF32_R_TYPE (rel->r_info);
3305 if (r_type == R_386_GNU_VTINHERIT
3306 || r_type == R_386_GNU_VTENTRY)
3309 if ((indx = r_type) >= R_386_standard
3310 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3311 >= R_386_ext - R_386_standard)
3312 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3313 >= R_386_irelative - R_386_ext))
3315 (*_bfd_error_handler)
3316 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3317 input_bfd, input_section, r_type);
3318 bfd_set_error (bfd_error_bad_value);
3321 howto = elf_howto_table + indx;
3323 r_symndx = ELF32_R_SYM (rel->r_info);
3327 unresolved_reloc = FALSE;
3328 if (r_symndx < symtab_hdr->sh_info)
3330 sym = local_syms + r_symndx;
3331 sec = local_sections[r_symndx];
3332 relocation = (sec->output_section->vma
3333 + sec->output_offset
3335 st_size = sym->st_size;
3337 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3338 && ((sec->flags & SEC_MERGE) != 0
3339 || (info->relocatable
3340 && sec->output_offset != 0)))
3343 bfd_byte *where = contents + rel->r_offset;
3345 switch (howto->size)
3348 addend = bfd_get_8 (input_bfd, where);
3349 if (howto->pc_relative)
3351 addend = (addend ^ 0x80) - 0x80;
3356 addend = bfd_get_16 (input_bfd, where);
3357 if (howto->pc_relative)
3359 addend = (addend ^ 0x8000) - 0x8000;
3364 addend = bfd_get_32 (input_bfd, where);
3365 if (howto->pc_relative)
3367 addend = (addend ^ 0x80000000) - 0x80000000;
3375 if (info->relocatable)
3376 addend += sec->output_offset;
3379 asection *msec = sec;
3380 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3382 addend -= relocation;
3383 addend += msec->output_section->vma + msec->output_offset;
3386 switch (howto->size)
3389 /* FIXME: overflow checks. */
3390 if (howto->pc_relative)
3392 bfd_put_8 (input_bfd, addend, where);
3395 if (howto->pc_relative)
3397 bfd_put_16 (input_bfd, addend, where);
3400 if (howto->pc_relative)
3402 bfd_put_32 (input_bfd, addend, where);
3406 else if (!info->relocatable
3407 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3409 /* Relocate against local STT_GNU_IFUNC symbol. */
3410 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3415 /* Set STT_GNU_IFUNC symbol value. */
3416 h->root.u.def.value = sym->st_value;
3417 h->root.u.def.section = sec;
3422 bfd_boolean warned ATTRIBUTE_UNUSED;
3423 bfd_boolean ignored ATTRIBUTE_UNUSED;
3425 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3426 r_symndx, symtab_hdr, sym_hashes,
3428 unresolved_reloc, warned, ignored);
3432 if (sec != NULL && discarded_section (sec))
3433 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3434 rel, 1, relend, howto, 0, contents);
3436 if (info->relocatable)
3439 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3440 it here if it is defined in a non-shared object. */
3442 && h->type == STT_GNU_IFUNC
3445 asection *plt, *gotplt, *base_got;
3449 if ((input_section->flags & SEC_ALLOC) == 0
3450 || h->plt.offset == (bfd_vma) -1)
3453 /* STT_GNU_IFUNC symbol must go through PLT. */
3454 if (htab->elf.splt != NULL)
3456 plt = htab->elf.splt;
3457 gotplt = htab->elf.sgotplt;
3461 plt = htab->elf.iplt;
3462 gotplt = htab->elf.igotplt;
3465 relocation = (plt->output_section->vma
3466 + plt->output_offset + h->plt.offset);
3471 if (h->root.root.string)
3472 name = h->root.root.string;
3474 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3476 (*_bfd_error_handler)
3477 (_("%B: relocation %s against STT_GNU_IFUNC "
3478 "symbol `%s' isn't handled by %s"), input_bfd,
3479 elf_howto_table[r_type].name,
3480 name, __FUNCTION__);
3481 bfd_set_error (bfd_error_bad_value);
3485 /* Generate dynamic relcoation only when there is a
3486 non-GOT reference in a shared object. */
3487 if (info->shared && h->non_got_ref)
3489 Elf_Internal_Rela outrel;
3493 /* Need a dynamic relocation to get the real function
3495 offset = _bfd_elf_section_offset (output_bfd,
3499 if (offset == (bfd_vma) -1
3500 || offset == (bfd_vma) -2)
3503 outrel.r_offset = (input_section->output_section->vma
3504 + input_section->output_offset
3507 if (h->dynindx == -1
3509 || info->executable)
3511 /* This symbol is resolved locally. */
3512 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3513 bfd_put_32 (output_bfd,
3514 (h->root.u.def.value
3515 + h->root.u.def.section->output_section->vma
3516 + h->root.u.def.section->output_offset),
3520 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3522 sreloc = htab->elf.irelifunc;
3523 elf_append_rel (output_bfd, sreloc, &outrel);
3525 /* If this reloc is against an external symbol, we
3526 do not want to fiddle with the addend. Otherwise,
3527 we need to include the symbol value so that it
3528 becomes an addend for the dynamic reloc. For an
3529 internal symbol, we have updated addend. */
3538 base_got = htab->elf.sgot;
3539 off = h->got.offset;
3541 if (base_got == NULL)
3544 if (off == (bfd_vma) -1)
3546 /* We can't use h->got.offset here to save state, or
3547 even just remember the offset, as finish_dynamic_symbol
3548 would use that as offset into .got. */
3550 if (htab->elf.splt != NULL)
3552 plt_index = h->plt.offset / plt_entry_size - 1;
3553 off = (plt_index + 3) * 4;
3554 base_got = htab->elf.sgotplt;
3558 plt_index = h->plt.offset / plt_entry_size;
3559 off = plt_index * 4;
3560 base_got = htab->elf.igotplt;
3563 if (h->dynindx == -1
3567 /* This references the local defitionion. We must
3568 initialize this entry in the global offset table.
3569 Since the offset must always be a multiple of 8,
3570 we use the least significant bit to record
3571 whether we have initialized it already.
3573 When doing a dynamic link, we create a .rela.got
3574 relocation entry to initialize the value. This
3575 is done in the finish_dynamic_symbol routine. */
3580 bfd_put_32 (output_bfd, relocation,
3581 base_got->contents + off);
3588 /* Adjust for static executables. */
3589 if (htab->elf.splt == NULL)
3590 relocation += gotplt->output_offset;
3594 relocation = (base_got->output_section->vma
3595 + base_got->output_offset + off
3596 - gotplt->output_section->vma
3597 - gotplt->output_offset);
3598 /* Adjust for static executables. */
3599 if (htab->elf.splt == NULL)
3600 relocation += gotplt->output_offset;
3606 relocation -= (gotplt->output_section->vma
3607 + gotplt->output_offset);
3615 /* Relocation is to the entry for this symbol in the global
3617 if (htab->elf.sgot == NULL)
3624 off = h->got.offset;
3625 dyn = htab->elf.dynamic_sections_created;
3626 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3628 && SYMBOL_REFERENCES_LOCAL (info, h))
3629 || (ELF_ST_VISIBILITY (h->other)
3630 && h->root.type == bfd_link_hash_undefweak))
3632 /* This is actually a static link, or it is a
3633 -Bsymbolic link and the symbol is defined
3634 locally, or the symbol was forced to be local
3635 because of a version file. We must initialize
3636 this entry in the global offset table. Since the
3637 offset must always be a multiple of 4, we use the
3638 least significant bit to record whether we have
3639 initialized it already.
3641 When doing a dynamic link, we create a .rel.got
3642 relocation entry to initialize the value. This
3643 is done in the finish_dynamic_symbol routine. */
3648 bfd_put_32 (output_bfd, relocation,
3649 htab->elf.sgot->contents + off);
3654 unresolved_reloc = FALSE;
3658 if (local_got_offsets == NULL)
3661 off = local_got_offsets[r_symndx];
3663 /* The offset must always be a multiple of 4. We use
3664 the least significant bit to record whether we have
3665 already generated the necessary reloc. */
3670 bfd_put_32 (output_bfd, relocation,
3671 htab->elf.sgot->contents + off);
3676 Elf_Internal_Rela outrel;
3678 s = htab->elf.srelgot;
3682 outrel.r_offset = (htab->elf.sgot->output_section->vma
3683 + htab->elf.sgot->output_offset
3685 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3686 elf_append_rel (output_bfd, s, &outrel);
3689 local_got_offsets[r_symndx] |= 1;
3693 if (off >= (bfd_vma) -2)
3696 relocation = htab->elf.sgot->output_section->vma
3697 + htab->elf.sgot->output_offset + off
3698 - htab->elf.sgotplt->output_section->vma
3699 - htab->elf.sgotplt->output_offset;
3703 /* Relocation is relative to the start of the global offset
3706 /* Check to make sure it isn't a protected function symbol
3707 for shared library since it may not be local when used
3708 as function address. We also need to make sure that a
3709 symbol is defined locally. */
3710 if (info->shared && h)
3712 if (!h->def_regular)
3716 switch (ELF_ST_VISIBILITY (h->other))
3719 v = _("hidden symbol");
3722 v = _("internal symbol");
3725 v = _("protected symbol");
3732 (*_bfd_error_handler)
3733 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3734 input_bfd, v, h->root.root.string);
3735 bfd_set_error (bfd_error_bad_value);
3738 else if (!info->executable
3739 && !SYMBOLIC_BIND (info, h)
3740 && h->type == STT_FUNC
3741 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3743 (*_bfd_error_handler)
3744 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3745 input_bfd, h->root.root.string);
3746 bfd_set_error (bfd_error_bad_value);
3751 /* Note that sgot is not involved in this
3752 calculation. We always want the start of .got.plt. If we
3753 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3754 permitted by the ABI, we might have to change this
3756 relocation -= htab->elf.sgotplt->output_section->vma
3757 + htab->elf.sgotplt->output_offset;
3761 /* Use global offset table as symbol value. */
3762 relocation = htab->elf.sgotplt->output_section->vma
3763 + htab->elf.sgotplt->output_offset;
3764 unresolved_reloc = FALSE;
3768 /* Relocation is to the entry for this symbol in the
3769 procedure linkage table. */
3771 /* Resolve a PLT32 reloc against a local symbol directly,
3772 without using the procedure linkage table. */
3776 eh = (struct elf_i386_link_hash_entry *) h;
3777 if ((h->plt.offset == (bfd_vma) -1
3778 && eh->plt_got.offset == (bfd_vma) -1)
3779 || htab->elf.splt == NULL)
3781 /* We didn't make a PLT entry for this symbol. This
3782 happens when statically linking PIC code, or when
3783 using -Bsymbolic. */
3787 if (h->plt.offset != (bfd_vma) -1)
3789 resolved_plt = htab->elf.splt;
3790 plt_offset = h->plt.offset;
3794 resolved_plt = htab->plt_got;
3795 plt_offset = eh->plt_got.offset;
3798 relocation = (resolved_plt->output_section->vma
3799 + resolved_plt->output_offset
3801 unresolved_reloc = FALSE;
3805 /* Set to symbol size. */
3806 relocation = st_size;
3811 if ((input_section->flags & SEC_ALLOC) == 0
3817 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3818 || h->root.type != bfd_link_hash_undefweak)
3819 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3820 || !SYMBOL_CALLS_LOCAL (info, h)))
3821 || (ELIMINATE_COPY_RELOCS
3828 || h->root.type == bfd_link_hash_undefweak
3829 || h->root.type == bfd_link_hash_undefined)))
3831 Elf_Internal_Rela outrel;
3832 bfd_boolean skip, relocate;
3835 /* When generating a shared object, these relocations
3836 are copied into the output file to be resolved at run
3843 _bfd_elf_section_offset (output_bfd, info, input_section,
3845 if (outrel.r_offset == (bfd_vma) -1)
3847 else if (outrel.r_offset == (bfd_vma) -2)
3848 skip = TRUE, relocate = TRUE;
3849 outrel.r_offset += (input_section->output_section->vma
3850 + input_section->output_offset);
3853 memset (&outrel, 0, sizeof outrel);
3856 && (r_type == R_386_PC32
3858 || !SYMBOLIC_BIND (info, h)
3859 || !h->def_regular))
3860 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3863 /* This symbol is local, or marked to become local. */
3865 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3868 sreloc = elf_section_data (input_section)->sreloc;
3870 if (sreloc == NULL || sreloc->contents == NULL)
3872 r = bfd_reloc_notsupported;
3873 goto check_relocation_error;
3876 elf_append_rel (output_bfd, sreloc, &outrel);
3878 /* If this reloc is against an external symbol, we do
3879 not want to fiddle with the addend. Otherwise, we
3880 need to include the symbol value so that it becomes
3881 an addend for the dynamic reloc. */
3888 if (!info->executable)
3890 Elf_Internal_Rela outrel;
3893 outrel.r_offset = rel->r_offset
3894 + input_section->output_section->vma
3895 + input_section->output_offset;
3896 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3897 sreloc = elf_section_data (input_section)->sreloc;
3900 elf_append_rel (output_bfd, sreloc, &outrel);
3905 case R_386_TLS_GOTDESC:
3906 case R_386_TLS_DESC_CALL:
3907 case R_386_TLS_IE_32:
3908 case R_386_TLS_GOTIE:
3909 tls_type = GOT_UNKNOWN;
3910 if (h == NULL && local_got_offsets)
3911 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3913 tls_type = elf_i386_hash_entry(h)->tls_type;
3914 if (tls_type == GOT_TLS_IE)
3915 tls_type = GOT_TLS_IE_NEG;
3917 if (! elf_i386_tls_transition (info, input_bfd,
3918 input_section, contents,
3919 symtab_hdr, sym_hashes,
3920 &r_type, tls_type, rel,
3921 relend, h, r_symndx))
3924 if (r_type == R_386_TLS_LE_32)
3926 BFD_ASSERT (! unresolved_reloc);
3927 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3932 /* GD->LE transition. */
3933 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3936 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3938 movl %gs:0, %eax; subl $foo@tpoff, %eax
3939 (6 byte form of subl). */
3940 memcpy (contents + rel->r_offset - 3,
3941 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3942 roff = rel->r_offset + 5;
3946 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3948 movl %gs:0, %eax; subl $foo@tpoff, %eax
3949 (6 byte form of subl). */
3950 memcpy (contents + rel->r_offset - 2,
3951 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3952 roff = rel->r_offset + 6;
3954 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3956 /* Skip R_386_PC32/R_386_PLT32. */
3960 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3962 /* GDesc -> LE transition.
3963 It's originally something like:
3964 leal x@tlsdesc(%ebx), %eax
3968 Registers other than %eax may be set up here. */
3973 roff = rel->r_offset;
3974 val = bfd_get_8 (input_bfd, contents + roff - 1);
3976 /* Now modify the instruction as appropriate. */
3977 /* aoliva FIXME: remove the above and xor the byte
3979 bfd_put_8 (output_bfd, val ^ 0x86,
3980 contents + roff - 1);
3981 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3985 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3987 /* GDesc -> LE transition.
3995 roff = rel->r_offset;
3996 bfd_put_8 (output_bfd, 0x66, contents + roff);
3997 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4000 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4004 /* IE->LE transition:
4005 Originally it can be one of:
4013 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4016 /* movl foo, %eax. */
4017 bfd_put_8 (output_bfd, 0xb8,
4018 contents + rel->r_offset - 1);
4024 type = bfd_get_8 (input_bfd,
4025 contents + rel->r_offset - 2);
4030 bfd_put_8 (output_bfd, 0xc7,
4031 contents + rel->r_offset - 2);
4032 bfd_put_8 (output_bfd,
4033 0xc0 | ((val >> 3) & 7),
4034 contents + rel->r_offset - 1);
4038 bfd_put_8 (output_bfd, 0x81,
4039 contents + rel->r_offset - 2);
4040 bfd_put_8 (output_bfd,
4041 0xc0 | ((val >> 3) & 7),
4042 contents + rel->r_offset - 1);
4049 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4050 contents + rel->r_offset);
4055 unsigned int val, type;
4057 /* {IE_32,GOTIE}->LE transition:
4058 Originally it can be one of:
4059 subl foo(%reg1), %reg2
4060 movl foo(%reg1), %reg2
4061 addl foo(%reg1), %reg2
4064 movl $foo, %reg2 (6 byte form)
4065 addl $foo, %reg2. */
4066 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4067 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4071 bfd_put_8 (output_bfd, 0xc7,
4072 contents + rel->r_offset - 2);
4073 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4074 contents + rel->r_offset - 1);
4076 else if (type == 0x2b)
4079 bfd_put_8 (output_bfd, 0x81,
4080 contents + rel->r_offset - 2);
4081 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4082 contents + rel->r_offset - 1);
4084 else if (type == 0x03)
4087 bfd_put_8 (output_bfd, 0x81,
4088 contents + rel->r_offset - 2);
4089 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4090 contents + rel->r_offset - 1);
4094 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4095 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4096 contents + rel->r_offset);
4098 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4099 contents + rel->r_offset);
4104 if (htab->elf.sgot == NULL)
4109 off = h->got.offset;
4110 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4114 if (local_got_offsets == NULL)
4117 off = local_got_offsets[r_symndx];
4118 offplt = local_tlsdesc_gotents[r_symndx];
4125 Elf_Internal_Rela outrel;
4129 if (htab->elf.srelgot == NULL)
4132 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4134 if (GOT_TLS_GDESC_P (tls_type))
4137 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4138 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4139 <= htab->elf.sgotplt->size);
4140 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4141 + htab->elf.sgotplt->output_offset
4143 + htab->sgotplt_jump_table_size);
4144 sreloc = htab->elf.srelplt;
4145 loc = sreloc->contents;
4146 loc += (htab->next_tls_desc_index++
4147 * sizeof (Elf32_External_Rel));
4148 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4149 <= sreloc->contents + sreloc->size);
4150 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4153 BFD_ASSERT (! unresolved_reloc);
4154 bfd_put_32 (output_bfd,
4155 relocation - elf_i386_dtpoff_base (info),
4156 htab->elf.sgotplt->contents + offplt
4157 + htab->sgotplt_jump_table_size + 4);
4161 bfd_put_32 (output_bfd, 0,
4162 htab->elf.sgotplt->contents + offplt
4163 + htab->sgotplt_jump_table_size + 4);
4167 sreloc = htab->elf.srelgot;
4169 outrel.r_offset = (htab->elf.sgot->output_section->vma
4170 + htab->elf.sgot->output_offset + off);
4172 if (GOT_TLS_GD_P (tls_type))
4173 dr_type = R_386_TLS_DTPMOD32;
4174 else if (GOT_TLS_GDESC_P (tls_type))
4176 else if (tls_type == GOT_TLS_IE_POS)
4177 dr_type = R_386_TLS_TPOFF;
4179 dr_type = R_386_TLS_TPOFF32;
4181 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4182 bfd_put_32 (output_bfd,
4183 relocation - elf_i386_dtpoff_base (info),
4184 htab->elf.sgot->contents + off);
4185 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4186 bfd_put_32 (output_bfd,
4187 elf_i386_dtpoff_base (info) - relocation,
4188 htab->elf.sgot->contents + off);
4189 else if (dr_type != R_386_TLS_DESC)
4190 bfd_put_32 (output_bfd, 0,
4191 htab->elf.sgot->contents + off);
4192 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4194 elf_append_rel (output_bfd, sreloc, &outrel);
4196 if (GOT_TLS_GD_P (tls_type))
4200 BFD_ASSERT (! unresolved_reloc);
4201 bfd_put_32 (output_bfd,
4202 relocation - elf_i386_dtpoff_base (info),
4203 htab->elf.sgot->contents + off + 4);
4207 bfd_put_32 (output_bfd, 0,
4208 htab->elf.sgot->contents + off + 4);
4209 outrel.r_info = ELF32_R_INFO (indx,
4210 R_386_TLS_DTPOFF32);
4211 outrel.r_offset += 4;
4212 elf_append_rel (output_bfd, sreloc, &outrel);
4215 else if (tls_type == GOT_TLS_IE_BOTH)
4217 bfd_put_32 (output_bfd,
4219 ? relocation - elf_i386_dtpoff_base (info)
4221 htab->elf.sgot->contents + off + 4);
4222 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4223 outrel.r_offset += 4;
4224 elf_append_rel (output_bfd, sreloc, &outrel);
4231 local_got_offsets[r_symndx] |= 1;
4234 if (off >= (bfd_vma) -2
4235 && ! GOT_TLS_GDESC_P (tls_type))
4237 if (r_type == R_386_TLS_GOTDESC
4238 || r_type == R_386_TLS_DESC_CALL)
4240 relocation = htab->sgotplt_jump_table_size + offplt;
4241 unresolved_reloc = FALSE;
4243 else if (r_type == ELF32_R_TYPE (rel->r_info))
4245 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4246 + htab->elf.sgotplt->output_offset;
4247 relocation = htab->elf.sgot->output_section->vma
4248 + htab->elf.sgot->output_offset + off - g_o_t;
4249 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4250 && tls_type == GOT_TLS_IE_BOTH)
4252 if (r_type == R_386_TLS_IE)
4253 relocation += g_o_t;
4254 unresolved_reloc = FALSE;
4256 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4258 unsigned int val, type;
4261 /* GD->IE transition. */
4262 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4263 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4266 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4268 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4270 roff = rel->r_offset - 3;
4274 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4276 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4277 roff = rel->r_offset - 2;
4279 memcpy (contents + roff,
4280 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4281 contents[roff + 7] = 0x80 | (val & 7);
4282 /* If foo is used only with foo@gotntpoff(%reg) and
4283 foo@indntpoff, but not with foo@gottpoff(%reg), change
4284 subl $foo@gottpoff(%reg), %eax
4286 addl $foo@gotntpoff(%reg), %eax. */
4287 if (tls_type == GOT_TLS_IE_POS)
4288 contents[roff + 6] = 0x03;
4289 bfd_put_32 (output_bfd,
4290 htab->elf.sgot->output_section->vma
4291 + htab->elf.sgot->output_offset + off
4292 - htab->elf.sgotplt->output_section->vma
4293 - htab->elf.sgotplt->output_offset,
4294 contents + roff + 8);
4295 /* Skip R_386_PLT32. */
4299 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4301 /* GDesc -> IE transition.
4302 It's originally something like:
4303 leal x@tlsdesc(%ebx), %eax
4306 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4308 movl x@gottpoff(%ebx), %eax # before negl %eax
4310 Registers other than %eax may be set up here. */
4314 /* First, make sure it's a leal adding ebx to a 32-bit
4315 offset into any register, although it's probably
4316 almost always going to be eax. */
4317 roff = rel->r_offset;
4319 /* Now modify the instruction as appropriate. */
4320 /* To turn a leal into a movl in the form we use it, it
4321 suffices to change the first byte from 0x8d to 0x8b.
4322 aoliva FIXME: should we decide to keep the leal, all
4323 we have to do is remove the statement below, and
4324 adjust the relaxation of R_386_TLS_DESC_CALL. */
4325 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4327 if (tls_type == GOT_TLS_IE_BOTH)
4330 bfd_put_32 (output_bfd,
4331 htab->elf.sgot->output_section->vma
4332 + htab->elf.sgot->output_offset + off
4333 - htab->elf.sgotplt->output_section->vma
4334 - htab->elf.sgotplt->output_offset,
4338 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4340 /* GDesc -> IE transition.
4348 depending on how we transformed the TLS_GOTDESC above.
4353 roff = rel->r_offset;
4355 /* Now modify the instruction as appropriate. */
4356 if (tls_type != GOT_TLS_IE_NEG)
4359 bfd_put_8 (output_bfd, 0x66, contents + roff);
4360 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4365 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4366 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4376 if (! elf_i386_tls_transition (info, input_bfd,
4377 input_section, contents,
4378 symtab_hdr, sym_hashes,
4379 &r_type, GOT_UNKNOWN, rel,
4380 relend, h, r_symndx))
4383 if (r_type != R_386_TLS_LDM)
4385 /* LD->LE transition:
4386 leal foo(%reg), %eax; call ___tls_get_addr.
4388 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4389 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4390 memcpy (contents + rel->r_offset - 2,
4391 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4392 /* Skip R_386_PC32/R_386_PLT32. */
4397 if (htab->elf.sgot == NULL)
4400 off = htab->tls_ldm_got.offset;
4405 Elf_Internal_Rela outrel;
4407 if (htab->elf.srelgot == NULL)
4410 outrel.r_offset = (htab->elf.sgot->output_section->vma
4411 + htab->elf.sgot->output_offset + off);
4413 bfd_put_32 (output_bfd, 0,
4414 htab->elf.sgot->contents + off);
4415 bfd_put_32 (output_bfd, 0,
4416 htab->elf.sgot->contents + off + 4);
4417 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4418 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4419 htab->tls_ldm_got.offset |= 1;
4421 relocation = htab->elf.sgot->output_section->vma
4422 + htab->elf.sgot->output_offset + off
4423 - htab->elf.sgotplt->output_section->vma
4424 - htab->elf.sgotplt->output_offset;
4425 unresolved_reloc = FALSE;
4428 case R_386_TLS_LDO_32:
4429 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4430 relocation -= elf_i386_dtpoff_base (info);
4432 /* When converting LDO to LE, we must negate. */
4433 relocation = -elf_i386_tpoff (info, relocation);
4436 case R_386_TLS_LE_32:
4438 if (!info->executable)
4440 Elf_Internal_Rela outrel;
4443 outrel.r_offset = rel->r_offset
4444 + input_section->output_section->vma
4445 + input_section->output_offset;
4446 if (h != NULL && h->dynindx != -1)
4450 if (r_type == R_386_TLS_LE_32)
4451 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4453 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4454 sreloc = elf_section_data (input_section)->sreloc;
4457 elf_append_rel (output_bfd, sreloc, &outrel);
4460 else if (r_type == R_386_TLS_LE_32)
4461 relocation = elf_i386_dtpoff_base (info) - relocation;
4463 relocation -= elf_i386_dtpoff_base (info);
4465 else if (r_type == R_386_TLS_LE_32)
4466 relocation = elf_i386_tpoff (info, relocation);
4468 relocation = -elf_i386_tpoff (info, relocation);
4475 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4476 because such sections are not SEC_ALLOC and thus ld.so will
4477 not process them. */
4478 if (unresolved_reloc
4479 && !((input_section->flags & SEC_DEBUGGING) != 0
4481 && _bfd_elf_section_offset (output_bfd, info, input_section,
4482 rel->r_offset) != (bfd_vma) -1)
4484 (*_bfd_error_handler)
4485 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4488 (long) rel->r_offset,
4490 h->root.root.string);
4495 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4496 contents, rel->r_offset,
4499 check_relocation_error:
4500 if (r != bfd_reloc_ok)
4505 name = h->root.root.string;
4508 name = bfd_elf_string_from_elf_section (input_bfd,
4509 symtab_hdr->sh_link,
4514 name = bfd_section_name (input_bfd, sec);
4517 if (r == bfd_reloc_overflow)
4519 if (! ((*info->callbacks->reloc_overflow)
4520 (info, (h ? &h->root : NULL), name, howto->name,
4521 (bfd_vma) 0, input_bfd, input_section,
4527 (*_bfd_error_handler)
4528 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4529 input_bfd, input_section,
4530 (long) rel->r_offset, name, (int) r);
4539 /* Finish up dynamic symbol handling. We set the contents of various
4540 dynamic sections here. */
4543 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4544 struct bfd_link_info *info,
4545 struct elf_link_hash_entry *h,
4546 Elf_Internal_Sym *sym)
4548 struct elf_i386_link_hash_table *htab;
4549 unsigned plt_entry_size;
4550 const struct elf_i386_backend_data *abed;
4551 struct elf_i386_link_hash_entry *eh;
4553 htab = elf_i386_hash_table (info);
4557 abed = get_elf_i386_backend_data (output_bfd);
4558 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4560 eh = (struct elf_i386_link_hash_entry *) h;
4562 if (h->plt.offset != (bfd_vma) -1)
4566 Elf_Internal_Rela rel;
4568 asection *plt, *gotplt, *relplt;
4570 /* When building a static executable, use .iplt, .igot.plt and
4571 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4572 if (htab->elf.splt != NULL)
4574 plt = htab->elf.splt;
4575 gotplt = htab->elf.sgotplt;
4576 relplt = htab->elf.srelplt;
4580 plt = htab->elf.iplt;
4581 gotplt = htab->elf.igotplt;
4582 relplt = htab->elf.irelplt;
4585 /* This symbol has an entry in the procedure linkage table. Set
4588 if ((h->dynindx == -1
4589 && !((h->forced_local || info->executable)
4591 && h->type == STT_GNU_IFUNC))
4597 /* Get the index in the procedure linkage table which
4598 corresponds to this symbol. This is the index of this symbol
4599 in all the symbols for which we are making plt entries. The
4600 first entry in the procedure linkage table is reserved.
4602 Get the offset into the .got table of the entry that
4603 corresponds to this function. Each .got entry is 4 bytes.
4604 The first three are reserved.
4606 For static executables, we don't reserve anything. */
4608 if (plt == htab->elf.splt)
4610 got_offset = h->plt.offset / plt_entry_size - 1;
4611 got_offset = (got_offset + 3) * 4;
4615 got_offset = h->plt.offset / plt_entry_size;
4616 got_offset = got_offset * 4;
4619 /* Fill in the entry in the procedure linkage table. */
4622 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4623 abed->plt->plt_entry_size);
4624 bfd_put_32 (output_bfd,
4625 (gotplt->output_section->vma
4626 + gotplt->output_offset
4628 plt->contents + h->plt.offset
4629 + abed->plt->plt_got_offset);
4631 if (abed->is_vxworks)
4633 int s, k, reloc_index;
4635 /* Create the R_386_32 relocation referencing the GOT
4636 for this PLT entry. */
4638 /* S: Current slot number (zero-based). */
4639 s = ((h->plt.offset - abed->plt->plt_entry_size)
4640 / abed->plt->plt_entry_size);
4641 /* K: Number of relocations for PLTResolve. */
4643 k = PLTRESOLVE_RELOCS_SHLIB;
4645 k = PLTRESOLVE_RELOCS;
4646 /* Skip the PLTresolve relocations, and the relocations for
4647 the other PLT slots. */
4648 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4649 loc = (htab->srelplt2->contents + reloc_index
4650 * sizeof (Elf32_External_Rel));
4652 rel.r_offset = (htab->elf.splt->output_section->vma
4653 + htab->elf.splt->output_offset
4654 + h->plt.offset + 2),
4655 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4656 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4658 /* Create the R_386_32 relocation referencing the beginning of
4659 the PLT for this GOT entry. */
4660 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4661 + htab->elf.sgotplt->output_offset
4663 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4664 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4665 loc + sizeof (Elf32_External_Rel));
4670 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4671 abed->plt->plt_entry_size);
4672 bfd_put_32 (output_bfd, got_offset,
4673 plt->contents + h->plt.offset
4674 + abed->plt->plt_got_offset);
4677 /* Fill in the entry in the global offset table. */
4678 bfd_put_32 (output_bfd,
4679 (plt->output_section->vma
4680 + plt->output_offset
4682 + abed->plt->plt_lazy_offset),
4683 gotplt->contents + got_offset);
4685 /* Fill in the entry in the .rel.plt section. */
4686 rel.r_offset = (gotplt->output_section->vma
4687 + gotplt->output_offset
4689 if (h->dynindx == -1
4690 || ((info->executable
4691 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4693 && h->type == STT_GNU_IFUNC))
4695 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4696 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4697 in the .got.plt section. */
4698 bfd_put_32 (output_bfd,
4699 (h->root.u.def.value
4700 + h->root.u.def.section->output_section->vma
4701 + h->root.u.def.section->output_offset),
4702 gotplt->contents + got_offset);
4703 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4704 /* R_386_IRELATIVE comes last. */
4705 plt_index = htab->next_irelative_index--;
4709 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4710 plt_index = htab->next_jump_slot_index++;
4712 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4713 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4715 /* Don't fill PLT entry for static executables. */
4716 if (plt == htab->elf.splt)
4718 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4719 plt->contents + h->plt.offset
4720 + abed->plt->plt_reloc_offset);
4721 bfd_put_32 (output_bfd, - (h->plt.offset
4722 + abed->plt->plt_plt_offset + 4),
4723 plt->contents + h->plt.offset
4724 + abed->plt->plt_plt_offset);
4727 else if (eh->plt_got.offset != (bfd_vma) -1)
4729 bfd_vma got_offset, plt_offset;
4730 asection *plt, *got, *gotplt;
4731 const bfd_byte *got_plt_entry;
4733 /* Offset of displacement of the indirect jump. */
4734 bfd_vma plt_got_offset = 2;
4736 /* Set the entry in the GOT procedure linkage table. */
4737 plt = htab->plt_got;
4738 got = htab->elf.sgot;
4739 gotplt = htab->elf.sgotplt;
4740 got_offset = h->got.offset;
4742 if (got_offset == (bfd_vma) -1
4748 /* Fill in the entry in the GOT procedure linkage table. */
4751 got_plt_entry = elf_i386_got_plt_entry;
4752 got_offset += got->output_section->vma + got->output_offset;
4756 got_plt_entry = elf_i386_pic_got_plt_entry;
4757 got_offset += (got->output_section->vma
4758 + got->output_offset
4759 - gotplt->output_section->vma
4760 - gotplt->output_offset);
4763 plt_offset = eh->plt_got.offset;
4764 memcpy (plt->contents + plt_offset, got_plt_entry,
4765 sizeof (elf_i386_got_plt_entry));
4766 bfd_put_32 (output_bfd, got_offset,
4767 plt->contents + plt_offset + plt_got_offset);
4771 && (h->plt.offset != (bfd_vma) -1
4772 || eh->plt_got.offset != (bfd_vma) -1))
4774 /* Mark the symbol as undefined, rather than as defined in
4775 the .plt section. Leave the value if there were any
4776 relocations where pointer equality matters (this is a clue
4777 for the dynamic linker, to make function pointer
4778 comparisons work between an application and shared
4779 library), otherwise set it to zero. If a function is only
4780 called from a binary, there is no need to slow down
4781 shared libraries because of that. */
4782 sym->st_shndx = SHN_UNDEF;
4783 if (!h->pointer_equality_needed)
4787 if (h->got.offset != (bfd_vma) -1
4788 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4789 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4791 Elf_Internal_Rela rel;
4793 /* This symbol has an entry in the global offset table. Set it
4796 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4799 rel.r_offset = (htab->elf.sgot->output_section->vma
4800 + htab->elf.sgot->output_offset
4801 + (h->got.offset & ~(bfd_vma) 1));
4803 /* If this is a static link, or it is a -Bsymbolic link and the
4804 symbol is defined locally or was forced to be local because
4805 of a version file, we just want to emit a RELATIVE reloc.
4806 The entry in the global offset table will already have been
4807 initialized in the relocate_section function. */
4809 && h->type == STT_GNU_IFUNC)
4813 /* Generate R_386_GLOB_DAT. */
4820 if (!h->pointer_equality_needed)
4823 /* For non-shared object, we can't use .got.plt, which
4824 contains the real function addres if we need pointer
4825 equality. We load the GOT entry with the PLT entry. */
4826 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4827 bfd_put_32 (output_bfd,
4828 (plt->output_section->vma
4829 + plt->output_offset + h->plt.offset),
4830 htab->elf.sgot->contents + h->got.offset);
4834 else if (info->shared
4835 && SYMBOL_REFERENCES_LOCAL (info, h))
4837 BFD_ASSERT((h->got.offset & 1) != 0);
4838 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4842 BFD_ASSERT((h->got.offset & 1) == 0);
4844 bfd_put_32 (output_bfd, (bfd_vma) 0,
4845 htab->elf.sgot->contents + h->got.offset);
4846 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4849 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4854 Elf_Internal_Rela rel;
4856 /* This symbol needs a copy reloc. Set it up. */
4858 if (h->dynindx == -1
4859 || (h->root.type != bfd_link_hash_defined
4860 && h->root.type != bfd_link_hash_defweak)
4861 || htab->srelbss == NULL)
4864 rel.r_offset = (h->root.u.def.value
4865 + h->root.u.def.section->output_section->vma
4866 + h->root.u.def.section->output_offset);
4867 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4868 elf_append_rel (output_bfd, htab->srelbss, &rel);
4874 /* Finish up local dynamic symbol handling. We set the contents of
4875 various dynamic sections here. */
4878 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4880 struct elf_link_hash_entry *h
4881 = (struct elf_link_hash_entry *) *slot;
4882 struct bfd_link_info *info
4883 = (struct bfd_link_info *) inf;
4885 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4889 /* Used to decide how to sort relocs in an optimal manner for the
4890 dynamic linker, before writing them out. */
4892 static enum elf_reloc_type_class
4893 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4894 const asection *rel_sec ATTRIBUTE_UNUSED,
4895 const Elf_Internal_Rela *rela)
4897 switch (ELF32_R_TYPE (rela->r_info))
4899 case R_386_RELATIVE:
4900 return reloc_class_relative;
4901 case R_386_JUMP_SLOT:
4902 return reloc_class_plt;
4904 return reloc_class_copy;
4906 return reloc_class_normal;
4910 /* Finish up the dynamic sections. */
4913 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4914 struct bfd_link_info *info)
4916 struct elf_i386_link_hash_table *htab;
4919 const struct elf_i386_backend_data *abed;
4921 htab = elf_i386_hash_table (info);
4925 dynobj = htab->elf.dynobj;
4926 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4927 abed = get_elf_i386_backend_data (output_bfd);
4929 if (htab->elf.dynamic_sections_created)
4931 Elf32_External_Dyn *dyncon, *dynconend;
4933 if (sdyn == NULL || htab->elf.sgot == NULL)
4936 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4937 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4938 for (; dyncon < dynconend; dyncon++)
4940 Elf_Internal_Dyn dyn;
4943 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4948 if (abed->is_vxworks
4949 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4954 s = htab->elf.sgotplt;
4955 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4959 s = htab->elf.srelplt;
4960 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4964 s = htab->elf.srelplt;
4965 dyn.d_un.d_val = s->size;
4969 /* My reading of the SVR4 ABI indicates that the
4970 procedure linkage table relocs (DT_JMPREL) should be
4971 included in the overall relocs (DT_REL). This is
4972 what Solaris does. However, UnixWare can not handle
4973 that case. Therefore, we override the DT_RELSZ entry
4974 here to make it not include the JMPREL relocs. */
4975 s = htab->elf.srelplt;
4978 dyn.d_un.d_val -= s->size;
4982 /* We may not be using the standard ELF linker script.
4983 If .rel.plt is the first .rel section, we adjust
4984 DT_REL to not include it. */
4985 s = htab->elf.srelplt;
4988 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4990 dyn.d_un.d_ptr += s->size;
4994 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4997 /* Fill in the first entry in the procedure linkage table. */
4998 if (htab->elf.splt && htab->elf.splt->size > 0)
5002 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5003 abed->plt->plt0_entry_size);
5004 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5005 abed->plt0_pad_byte,
5006 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5010 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5011 abed->plt->plt0_entry_size);
5012 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5013 abed->plt0_pad_byte,
5014 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5015 bfd_put_32 (output_bfd,
5016 (htab->elf.sgotplt->output_section->vma
5017 + htab->elf.sgotplt->output_offset
5019 htab->elf.splt->contents
5020 + abed->plt->plt0_got1_offset);
5021 bfd_put_32 (output_bfd,
5022 (htab->elf.sgotplt->output_section->vma
5023 + htab->elf.sgotplt->output_offset
5025 htab->elf.splt->contents
5026 + abed->plt->plt0_got2_offset);
5028 if (abed->is_vxworks)
5030 Elf_Internal_Rela rel;
5032 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5033 On IA32 we use REL relocations so the addend goes in
5034 the PLT directly. */
5035 rel.r_offset = (htab->elf.splt->output_section->vma
5036 + htab->elf.splt->output_offset
5037 + abed->plt->plt0_got1_offset);
5038 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5039 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5040 htab->srelplt2->contents);
5041 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5042 rel.r_offset = (htab->elf.splt->output_section->vma
5043 + htab->elf.splt->output_offset
5044 + abed->plt->plt0_got2_offset);
5045 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5046 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5047 htab->srelplt2->contents +
5048 sizeof (Elf32_External_Rel));
5052 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5053 really seem like the right value. */
5054 elf_section_data (htab->elf.splt->output_section)
5055 ->this_hdr.sh_entsize = 4;
5057 /* Correct the .rel.plt.unloaded relocations. */
5058 if (abed->is_vxworks && !info->shared)
5060 int num_plts = (htab->elf.splt->size
5061 / abed->plt->plt_entry_size) - 1;
5064 p = htab->srelplt2->contents;
5066 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5068 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5070 for (; num_plts; num_plts--)
5072 Elf_Internal_Rela rel;
5073 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5074 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5075 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5076 p += sizeof (Elf32_External_Rel);
5078 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5079 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5080 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5081 p += sizeof (Elf32_External_Rel);
5087 if (htab->elf.sgotplt)
5089 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5091 (*_bfd_error_handler)
5092 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5096 /* Fill in the first three entries in the global offset table. */
5097 if (htab->elf.sgotplt->size > 0)
5099 bfd_put_32 (output_bfd,
5101 : sdyn->output_section->vma + sdyn->output_offset),
5102 htab->elf.sgotplt->contents);
5103 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5104 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5107 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5110 /* Adjust .eh_frame for .plt section. */
5111 if (htab->plt_eh_frame != NULL
5112 && htab->plt_eh_frame->contents != NULL)
5114 if (htab->elf.splt != NULL
5115 && htab->elf.splt->size != 0
5116 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5117 && htab->elf.splt->output_section != NULL
5118 && htab->plt_eh_frame->output_section != NULL)
5120 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5121 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5122 + htab->plt_eh_frame->output_offset
5123 + PLT_FDE_START_OFFSET;
5124 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5125 htab->plt_eh_frame->contents
5126 + PLT_FDE_START_OFFSET);
5128 if (htab->plt_eh_frame->sec_info_type
5129 == SEC_INFO_TYPE_EH_FRAME)
5131 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5133 htab->plt_eh_frame->contents))
5138 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5139 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5141 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5142 htab_traverse (htab->loc_hash_table,
5143 elf_i386_finish_local_dynamic_symbol,
5149 /* Return an array of PLT entry symbol values. */
5152 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5155 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5158 bfd_vma *plt_sym_val;
5160 bfd_byte *plt_contents;
5161 const struct elf_i386_backend_data *bed
5162 = get_elf_i386_backend_data (abfd);
5163 Elf_Internal_Shdr *hdr;
5165 /* Get the .plt section contents. */
5166 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5167 if (plt_contents == NULL)
5169 if (!bfd_get_section_contents (abfd, (asection *) plt,
5170 plt_contents, 0, plt->size))
5173 free (plt_contents);
5177 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5178 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5181 hdr = &elf_section_data (relplt)->this_hdr;
5182 count = relplt->size / hdr->sh_entsize;
5184 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5185 if (plt_sym_val == NULL)
5188 for (i = 0; i < count; i++, p++)
5189 plt_sym_val[i] = -1;
5191 plt_offset = bed->plt->plt_entry_size;
5192 p = relplt->relocation;
5193 for (i = 0; i < count; i++, p++)
5197 if (p->howto == NULL /* PR 17512: file: bc9d6cf5. */
5198 || (p->howto->type != R_386_JUMP_SLOT
5199 && p->howto->type != R_386_IRELATIVE))
5202 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5203 + bed->plt->plt_reloc_offset));
5204 reloc_index /= sizeof (Elf32_External_Rel);
5205 if (reloc_index >= count)
5207 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5208 plt_offset += bed->plt->plt_entry_size;
5211 free (plt_contents);
5216 /* Similar to _bfd_elf_get_synthetic_symtab. */
5219 elf_i386_get_synthetic_symtab (bfd *abfd,
5226 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5227 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5228 dynsymcount, dynsyms, ret,
5230 elf_i386_get_plt_sym_val);
5233 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5236 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5238 if (h->plt.offset != (bfd_vma) -1
5240 && !h->pointer_equality_needed)
5243 return _bfd_elf_hash_symbol (h);
5246 /* Hook called by the linker routine which adds symbols from an object
5250 elf_i386_add_symbol_hook (bfd * abfd,
5251 struct bfd_link_info * info,
5252 Elf_Internal_Sym * sym,
5253 const char ** namep ATTRIBUTE_UNUSED,
5254 flagword * flagsp ATTRIBUTE_UNUSED,
5255 asection ** secp ATTRIBUTE_UNUSED,
5256 bfd_vma * valp ATTRIBUTE_UNUSED)
5258 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5259 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5260 && (abfd->flags & DYNAMIC) == 0
5261 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5262 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5267 #define TARGET_LITTLE_SYM i386_elf32_vec
5268 #define TARGET_LITTLE_NAME "elf32-i386"
5269 #define ELF_ARCH bfd_arch_i386
5270 #define ELF_TARGET_ID I386_ELF_DATA
5271 #define ELF_MACHINE_CODE EM_386
5272 #define ELF_MAXPAGESIZE 0x1000
5274 #define elf_backend_can_gc_sections 1
5275 #define elf_backend_can_refcount 1
5276 #define elf_backend_want_got_plt 1
5277 #define elf_backend_plt_readonly 1
5278 #define elf_backend_want_plt_sym 0
5279 #define elf_backend_got_header_size 12
5280 #define elf_backend_plt_alignment 4
5282 /* Support RELA for objdump of prelink objects. */
5283 #define elf_info_to_howto elf_i386_info_to_howto_rel
5284 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5286 #define bfd_elf32_mkobject elf_i386_mkobject
5288 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5289 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5290 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5291 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5292 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5294 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5295 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5296 #define elf_backend_check_relocs elf_i386_check_relocs
5297 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5298 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5299 #define elf_backend_fake_sections elf_i386_fake_sections
5300 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5301 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5302 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5303 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5304 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5305 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5306 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5307 #define elf_backend_relocate_section elf_i386_relocate_section
5308 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5309 #define elf_backend_always_size_sections elf_i386_always_size_sections
5310 #define elf_backend_omit_section_dynsym \
5311 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5312 #define elf_backend_hash_symbol elf_i386_hash_symbol
5313 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5315 #include "elf32-target.h"
5317 /* FreeBSD support. */
5319 #undef TARGET_LITTLE_SYM
5320 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5321 #undef TARGET_LITTLE_NAME
5322 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5324 #define ELF_OSABI ELFOSABI_FREEBSD
5326 /* The kernel recognizes executables as valid only if they carry a
5327 "FreeBSD" label in the ELF header. So we put this label on all
5328 executables and (for simplicity) also all other object files. */
5331 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5333 _bfd_elf_post_process_headers (abfd, info);
5335 #ifdef OLD_FREEBSD_ABI_LABEL
5337 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5338 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5339 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5344 #undef elf_backend_post_process_headers
5345 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5347 #define elf32_bed elf32_i386_fbsd_bed
5349 #undef elf_backend_add_symbol_hook
5351 #include "elf32-target.h"
5355 #undef TARGET_LITTLE_SYM
5356 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5357 #undef TARGET_LITTLE_NAME
5358 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5360 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5361 objects won't be recognized. */
5365 #define elf32_bed elf32_i386_sol2_bed
5367 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5369 #undef elf_backend_static_tls_alignment
5370 #define elf_backend_static_tls_alignment 8
5372 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5374 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5376 #undef elf_backend_want_plt_sym
5377 #define elf_backend_want_plt_sym 1
5379 #include "elf32-target.h"
5381 /* Native Client support. */
5383 #undef TARGET_LITTLE_SYM
5384 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5385 #undef TARGET_LITTLE_NAME
5386 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5388 #define elf32_bed elf32_i386_nacl_bed
5390 #undef ELF_MAXPAGESIZE
5391 #define ELF_MAXPAGESIZE 0x10000
5393 /* Restore defaults. */
5395 #undef elf_backend_want_plt_sym
5396 #define elf_backend_want_plt_sym 0
5397 #undef elf_backend_post_process_headers
5398 #undef elf_backend_static_tls_alignment
5400 /* NaCl uses substantially different PLT entries for the same effects. */
5402 #undef elf_backend_plt_alignment
5403 #define elf_backend_plt_alignment 5
5404 #define NACL_PLT_ENTRY_SIZE 64
5405 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5407 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5409 0xff, 0x35, /* pushl contents of address */
5410 0, 0, 0, 0, /* replaced with address of .got + 4. */
5411 0x8b, 0x0d, /* movl contents of address, %ecx */
5412 0, 0, 0, 0, /* replaced with address of .got + 8. */
5413 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5414 0xff, 0xe1 /* jmp *%ecx */
5417 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5419 0x8b, 0x0d, /* movl contents of address, %ecx */
5420 0, 0, 0, 0, /* replaced with GOT slot address. */
5421 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5422 0xff, 0xe1, /* jmp *%ecx */
5424 /* Pad to the next 32-byte boundary with nop instructions. */
5426 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5427 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5429 /* Lazy GOT entries point here (32-byte aligned). */
5430 0x68, /* pushl immediate */
5431 0, 0, 0, 0, /* replaced with reloc offset. */
5432 0xe9, /* jmp relative */
5433 0, 0, 0, 0, /* replaced with offset to .plt. */
5435 /* Pad to the next 32-byte boundary with nop instructions. */
5436 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5437 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5441 static const bfd_byte
5442 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5444 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5445 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5446 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5447 0xff, 0xe1, /* jmp *%ecx */
5449 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5450 so pad to that size with nop instructions. */
5451 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5454 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5456 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5457 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5458 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5459 0xff, 0xe1, /* jmp *%ecx */
5461 /* Pad to the next 32-byte boundary with nop instructions. */
5463 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5464 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5466 /* Lazy GOT entries point here (32-byte aligned). */
5467 0x68, /* pushl immediate */
5468 0, 0, 0, 0, /* replaced with offset into relocation table. */
5469 0xe9, /* jmp relative */
5470 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5472 /* Pad to the next 32-byte boundary with nop instructions. */
5473 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5474 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5478 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5480 #if (PLT_CIE_LENGTH != 20 \
5481 || PLT_FDE_LENGTH != 36 \
5482 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5483 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5484 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5486 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5487 0, 0, 0, 0, /* CIE ID */
5488 1, /* CIE version */
5489 'z', 'R', 0, /* Augmentation string */
5490 1, /* Code alignment factor */
5491 0x7c, /* Data alignment factor: -4 */
5492 8, /* Return address column */
5493 1, /* Augmentation size */
5494 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5495 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5496 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5497 DW_CFA_nop, DW_CFA_nop,
5499 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5500 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5501 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5502 0, 0, 0, 0, /* .plt size goes here */
5503 0, /* Augmentation size */
5504 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5505 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5506 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5507 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5508 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5509 13, /* Block length */
5510 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5511 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5512 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5513 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5514 DW_CFA_nop, DW_CFA_nop
5517 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5519 elf_i386_nacl_plt0_entry, /* plt0_entry */
5520 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5521 2, /* plt0_got1_offset */
5522 8, /* plt0_got2_offset */
5523 elf_i386_nacl_plt_entry, /* plt_entry */
5524 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5525 2, /* plt_got_offset */
5526 33, /* plt_reloc_offset */
5527 38, /* plt_plt_offset */
5528 32, /* plt_lazy_offset */
5529 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5530 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5531 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5532 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5535 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5537 &elf_i386_nacl_plt, /* plt */
5538 0x90, /* plt0_pad_byte: nop insn */
5543 elf32_i386_nacl_elf_object_p (bfd *abfd)
5545 /* Set the right machine number for a NaCl i386 ELF32 file. */
5546 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5550 #undef elf_backend_arch_data
5551 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5553 #undef elf_backend_object_p
5554 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5555 #undef elf_backend_modify_segment_map
5556 #define elf_backend_modify_segment_map nacl_modify_segment_map
5557 #undef elf_backend_modify_program_headers
5558 #define elf_backend_modify_program_headers nacl_modify_program_headers
5559 #undef elf_backend_final_write_processing
5560 #define elf_backend_final_write_processing nacl_final_write_processing
5562 #include "elf32-target.h"
5564 /* Restore defaults. */
5565 #undef elf_backend_object_p
5566 #undef elf_backend_modify_segment_map
5567 #undef elf_backend_modify_program_headers
5568 #undef elf_backend_final_write_processing
5570 /* VxWorks support. */
5572 #undef TARGET_LITTLE_SYM
5573 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5574 #undef TARGET_LITTLE_NAME
5575 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5577 #undef elf_backend_plt_alignment
5578 #define elf_backend_plt_alignment 4
5580 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5582 &elf_i386_plt, /* plt */
5583 0x90, /* plt0_pad_byte */
5587 #undef elf_backend_arch_data
5588 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5590 #undef elf_backend_relocs_compatible
5591 #undef elf_backend_add_symbol_hook
5592 #define elf_backend_add_symbol_hook \
5593 elf_vxworks_add_symbol_hook
5594 #undef elf_backend_link_output_symbol_hook
5595 #define elf_backend_link_output_symbol_hook \
5596 elf_vxworks_link_output_symbol_hook
5597 #undef elf_backend_emit_relocs
5598 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5599 #undef elf_backend_final_write_processing
5600 #define elf_backend_final_write_processing \
5601 elf_vxworks_final_write_processing
5602 #undef elf_backend_static_tls_alignment
5604 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5606 #undef elf_backend_want_plt_sym
5607 #define elf_backend_want_plt_sym 1
5610 #define elf32_bed elf32_i386_vxworks_bed
5612 #include "elf32-target.h"