1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-nacl.h"
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
31 #include "objalloc.h"
32 #include "hashtab.h"
33 #include "dwarf2.h"
34
35 /* 386 uses REL relocations instead of RELA. */
36 #define USE_REL 1
37
38 #include "elf/i386.h"
39
40 static reloc_howto_type elf_howto_table[]=
41 {
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
137 bfd_elf_generic_reloc, "R_386_SIZE32",
138 TRUE, 0xffffffff, 0xffffffff, FALSE),
139 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
141 TRUE, 0xffffffff, 0xffffffff, FALSE),
142 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 FALSE, 0, 0, FALSE),
145 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_386_TLS_DESC",
147 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_386_IRELATIVE",
150 TRUE, 0xffffffff, 0xffffffff, FALSE),
151
152 /* Another gap. */
153 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
154 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
155
156 /* GNU extension to record C++ vtable hierarchy. */
157 HOWTO (R_386_GNU_VTINHERIT, /* type */
158 0, /* rightshift */
159 2, /* size (0 = byte, 1 = short, 2 = long) */
160 0, /* bitsize */
161 FALSE, /* pc_relative */
162 0, /* bitpos */
163 complain_overflow_dont, /* complain_on_overflow */
164 NULL, /* special_function */
165 "R_386_GNU_VTINHERIT", /* name */
166 FALSE, /* partial_inplace */
167 0, /* src_mask */
168 0, /* dst_mask */
169 FALSE), /* pcrel_offset */
170
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_386_GNU_VTENTRY, /* type */
173 0, /* rightshift */
174 2, /* size (0 = byte, 1 = short, 2 = long) */
175 0, /* bitsize */
176 FALSE, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_dont, /* complain_on_overflow */
179 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
180 "R_386_GNU_VTENTRY", /* name */
181 FALSE, /* partial_inplace */
182 0, /* src_mask */
183 0, /* dst_mask */
184 FALSE) /* pcrel_offset */
185
186 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
187
188 };
189
190 #ifdef DEBUG_GEN_RELOC
191 #define TRACE(str) \
192 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
193 #else
194 #define TRACE(str)
195 #endif
196
197 static reloc_howto_type *
elf_i386_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)198 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
199 bfd_reloc_code_real_type code)
200 {
201 switch (code)
202 {
203 case BFD_RELOC_NONE:
204 TRACE ("BFD_RELOC_NONE");
205 return &elf_howto_table[R_386_NONE];
206
207 case BFD_RELOC_32:
208 TRACE ("BFD_RELOC_32");
209 return &elf_howto_table[R_386_32];
210
211 case BFD_RELOC_CTOR:
212 TRACE ("BFD_RELOC_CTOR");
213 return &elf_howto_table[R_386_32];
214
215 case BFD_RELOC_32_PCREL:
216 TRACE ("BFD_RELOC_PC32");
217 return &elf_howto_table[R_386_PC32];
218
219 case BFD_RELOC_386_GOT32:
220 TRACE ("BFD_RELOC_386_GOT32");
221 return &elf_howto_table[R_386_GOT32];
222
223 case BFD_RELOC_386_PLT32:
224 TRACE ("BFD_RELOC_386_PLT32");
225 return &elf_howto_table[R_386_PLT32];
226
227 case BFD_RELOC_386_COPY:
228 TRACE ("BFD_RELOC_386_COPY");
229 return &elf_howto_table[R_386_COPY];
230
231 case BFD_RELOC_386_GLOB_DAT:
232 TRACE ("BFD_RELOC_386_GLOB_DAT");
233 return &elf_howto_table[R_386_GLOB_DAT];
234
235 case BFD_RELOC_386_JUMP_SLOT:
236 TRACE ("BFD_RELOC_386_JUMP_SLOT");
237 return &elf_howto_table[R_386_JUMP_SLOT];
238
239 case BFD_RELOC_386_RELATIVE:
240 TRACE ("BFD_RELOC_386_RELATIVE");
241 return &elf_howto_table[R_386_RELATIVE];
242
243 case BFD_RELOC_386_GOTOFF:
244 TRACE ("BFD_RELOC_386_GOTOFF");
245 return &elf_howto_table[R_386_GOTOFF];
246
247 case BFD_RELOC_386_GOTPC:
248 TRACE ("BFD_RELOC_386_GOTPC");
249 return &elf_howto_table[R_386_GOTPC];
250
251 /* These relocs are a GNU extension. */
252 case BFD_RELOC_386_TLS_TPOFF:
253 TRACE ("BFD_RELOC_386_TLS_TPOFF");
254 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_IE:
257 TRACE ("BFD_RELOC_386_TLS_IE");
258 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GOTIE:
261 TRACE ("BFD_RELOC_386_TLS_GOTIE");
262 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LE:
265 TRACE ("BFD_RELOC_386_TLS_LE");
266 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
267
268 case BFD_RELOC_386_TLS_GD:
269 TRACE ("BFD_RELOC_386_TLS_GD");
270 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
271
272 case BFD_RELOC_386_TLS_LDM:
273 TRACE ("BFD_RELOC_386_TLS_LDM");
274 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
275
276 case BFD_RELOC_16:
277 TRACE ("BFD_RELOC_16");
278 return &elf_howto_table[R_386_16 - R_386_ext_offset];
279
280 case BFD_RELOC_16_PCREL:
281 TRACE ("BFD_RELOC_16_PCREL");
282 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
283
284 case BFD_RELOC_8:
285 TRACE ("BFD_RELOC_8");
286 return &elf_howto_table[R_386_8 - R_386_ext_offset];
287
288 case BFD_RELOC_8_PCREL:
289 TRACE ("BFD_RELOC_8_PCREL");
290 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
291
292 /* Common with Sun TLS implementation. */
293 case BFD_RELOC_386_TLS_LDO_32:
294 TRACE ("BFD_RELOC_386_TLS_LDO_32");
295 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_IE_32:
298 TRACE ("BFD_RELOC_386_TLS_IE_32");
299 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_LE_32:
302 TRACE ("BFD_RELOC_386_TLS_LE_32");
303 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_DTPMOD32:
306 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
307 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_DTPOFF32:
310 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
311 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_TPOFF32:
314 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
315 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
316
317 case BFD_RELOC_SIZE32:
318 TRACE ("BFD_RELOC_SIZE32");
319 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_GOTDESC:
322 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
323 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_TLS_DESC_CALL:
326 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
327 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
328
329 case BFD_RELOC_386_TLS_DESC:
330 TRACE ("BFD_RELOC_386_TLS_DESC");
331 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
332
333 case BFD_RELOC_386_IRELATIVE:
334 TRACE ("BFD_RELOC_386_IRELATIVE");
335 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
336
337 case BFD_RELOC_VTABLE_INHERIT:
338 TRACE ("BFD_RELOC_VTABLE_INHERIT");
339 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
340
341 case BFD_RELOC_VTABLE_ENTRY:
342 TRACE ("BFD_RELOC_VTABLE_ENTRY");
343 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
344
345 default:
346 break;
347 }
348
349 TRACE ("Unknown");
350 return 0;
351 }
352
353 static reloc_howto_type *
elf_i386_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)354 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
355 const char *r_name)
356 {
357 unsigned int i;
358
359 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
360 if (elf_howto_table[i].name != NULL
361 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
362 return &elf_howto_table[i];
363
364 return NULL;
365 }
366
367 static reloc_howto_type *
elf_i386_rtype_to_howto(bfd * abfd,unsigned r_type)368 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
369 {
370 unsigned int indx;
371
372 if ((indx = r_type) >= R_386_standard
373 && ((indx = r_type - R_386_ext_offset) - R_386_standard
374 >= R_386_ext - R_386_standard)
375 && ((indx = r_type - R_386_tls_offset) - R_386_ext
376 >= R_386_irelative - R_386_ext)
377 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
378 >= R_386_vt - R_386_irelative))
379 {
380 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 BFD_ASSERT (elf_howto_table [indx].type == r_type);
385 return &elf_howto_table[indx];
386 }
387
388 static void
elf_i386_info_to_howto_rel(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
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. */
402
403 static bfd_boolean
elf_i386_is_local_label_name(bfd * abfd,const char * name)404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
elf_i386_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
elf_i386_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
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);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
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);
493 }
494 }
495
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. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
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. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
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
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
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. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
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. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
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. */
562 };
563
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. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
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. */
583 };
584
585 /* .eh_frame covering the .plt section. */
586
587 static const bfd_byte elf_i386_eh_frame_plt[] =
588 {
589 #define PLT_CIE_LENGTH 20
590 #define PLT_FDE_LENGTH 36
591 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
592 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
593 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
594 0, 0, 0, 0, /* CIE ID */
595 1, /* CIE version */
596 'z', 'R', 0, /* Augmentation string */
597 1, /* Code alignment factor */
598 0x7c, /* Data alignment factor */
599 8, /* Return address column */
600 1, /* Augmentation size */
601 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
602 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
603 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
604 DW_CFA_nop, DW_CFA_nop,
605
606 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
607 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
608 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
609 0, 0, 0, 0, /* .plt size goes here */
610 0, /* Augmentation size */
611 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
612 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
613 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
614 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
615 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
616 11, /* Block length */
617 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
618 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
619 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
620 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
621 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
622 };
623
624 struct elf_i386_plt_layout
625 {
626 /* The first entry in an absolute procedure linkage table looks like this. */
627 const bfd_byte *plt0_entry;
628 unsigned int plt0_entry_size;
629
630 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
631 unsigned int plt0_got1_offset;
632 unsigned int plt0_got2_offset;
633
634 /* Later entries in an absolute procedure linkage table look like this. */
635 const bfd_byte *plt_entry;
636 unsigned int plt_entry_size;
637
638 /* Offsets into plt_entry that are to be replaced with... */
639 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
640 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
641 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
642
643 /* Offset into plt_entry where the initial value of the GOT entry points. */
644 unsigned int plt_lazy_offset;
645
646 /* The first entry in a PIC procedure linkage table looks like this. */
647 const bfd_byte *pic_plt0_entry;
648
649 /* Subsequent entries in a PIC procedure linkage table look like this. */
650 const bfd_byte *pic_plt_entry;
651
652 /* .eh_frame covering the .plt section. */
653 const bfd_byte *eh_frame_plt;
654 unsigned int eh_frame_plt_size;
655 };
656
657 #define GET_PLT_ENTRY_SIZE(abfd) \
658 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
659
660 /* These are the standard parameters. */
661 static const struct elf_i386_plt_layout elf_i386_plt =
662 {
663 elf_i386_plt0_entry, /* plt0_entry */
664 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
665 2, /* plt0_got1_offset */
666 8, /* plt0_got2_offset */
667 elf_i386_plt_entry, /* plt_entry */
668 PLT_ENTRY_SIZE, /* plt_entry_size */
669 2, /* plt_got_offset */
670 7, /* plt_reloc_offset */
671 12, /* plt_plt_offset */
672 6, /* plt_lazy_offset */
673 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
674 elf_i386_pic_plt_entry, /* pic_plt_entry */
675 elf_i386_eh_frame_plt, /* eh_frame_plt */
676 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
677 };
678
679
680 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
681 for the PLTResolve stub and then for each PLT entry. */
682 #define PLTRESOLVE_RELOCS_SHLIB 0
683 #define PLTRESOLVE_RELOCS 2
684 #define PLT_NON_JUMP_SLOT_RELOCS 2
685
686 /* Architecture-specific backend data for i386. */
687
688 struct elf_i386_backend_data
689 {
690 /* Parameters describing PLT generation. */
691 const struct elf_i386_plt_layout *plt;
692
693 /* Value used to fill the unused bytes of the first PLT entry. */
694 bfd_byte plt0_pad_byte;
695
696 /* True if the target system is VxWorks. */
697 int is_vxworks;
698 };
699
700 #define get_elf_i386_backend_data(abfd) \
701 ((const struct elf_i386_backend_data *) \
702 get_elf_backend_data (abfd)->arch_data)
703
704 /* These are the standard parameters. */
705 static const struct elf_i386_backend_data elf_i386_arch_bed =
706 {
707 &elf_i386_plt, /* plt */
708 0, /* plt0_pad_byte */
709 0, /* is_vxworks */
710 };
711
712 #define elf_backend_arch_data &elf_i386_arch_bed
713
714 /* i386 ELF linker hash entry. */
715
716 struct elf_i386_link_hash_entry
717 {
718 struct elf_link_hash_entry elf;
719
720 /* Track dynamic relocs copied for this symbol. */
721 struct elf_dyn_relocs *dyn_relocs;
722
723 #define GOT_UNKNOWN 0
724 #define GOT_NORMAL 1
725 #define GOT_TLS_GD 2
726 #define GOT_TLS_IE 4
727 #define GOT_TLS_IE_POS 5
728 #define GOT_TLS_IE_NEG 6
729 #define GOT_TLS_IE_BOTH 7
730 #define GOT_TLS_GDESC 8
731 #define GOT_TLS_GD_BOTH_P(type) \
732 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
733 #define GOT_TLS_GD_P(type) \
734 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
735 #define GOT_TLS_GDESC_P(type) \
736 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
737 #define GOT_TLS_GD_ANY_P(type) \
738 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
739 unsigned char tls_type;
740
741 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
742 starting at the end of the jump table. */
743 bfd_vma tlsdesc_got;
744 };
745
746 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
747
748 struct elf_i386_obj_tdata
749 {
750 struct elf_obj_tdata root;
751
752 /* tls_type for each local got entry. */
753 char *local_got_tls_type;
754
755 /* GOTPLT entries for TLS descriptors. */
756 bfd_vma *local_tlsdesc_gotent;
757 };
758
759 #define elf_i386_tdata(abfd) \
760 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
761
762 #define elf_i386_local_got_tls_type(abfd) \
763 (elf_i386_tdata (abfd)->local_got_tls_type)
764
765 #define elf_i386_local_tlsdesc_gotent(abfd) \
766 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
767
768 #define is_i386_elf(bfd) \
769 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
770 && elf_tdata (bfd) != NULL \
771 && elf_object_id (bfd) == I386_ELF_DATA)
772
773 static bfd_boolean
elf_i386_mkobject(bfd * abfd)774 elf_i386_mkobject (bfd *abfd)
775 {
776 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
777 I386_ELF_DATA);
778 }
779
780 /* i386 ELF linker hash table. */
781
782 struct elf_i386_link_hash_table
783 {
784 struct elf_link_hash_table elf;
785
786 /* Short-cuts to get to dynamic linker sections. */
787 asection *sdynbss;
788 asection *srelbss;
789 asection *plt_eh_frame;
790
791 union
792 {
793 bfd_signed_vma refcount;
794 bfd_vma offset;
795 } tls_ldm_got;
796
797 /* The amount of space used by the reserved portion of the sgotplt
798 section, plus whatever space is used by the jump slots. */
799 bfd_vma sgotplt_jump_table_size;
800
801 /* Small local sym cache. */
802 struct sym_cache sym_cache;
803
804 /* _TLS_MODULE_BASE_ symbol. */
805 struct bfd_link_hash_entry *tls_module_base;
806
807 /* Used by local STT_GNU_IFUNC symbols. */
808 htab_t loc_hash_table;
809 void * loc_hash_memory;
810
811 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
812 asection *srelplt2;
813
814 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
815 bfd_vma next_tls_desc_index;
816
817 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
818 bfd_vma next_jump_slot_index;
819
820 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
821 bfd_vma next_irelative_index;
822 };
823
824 /* Get the i386 ELF linker hash table from a link_info structure. */
825
826 #define elf_i386_hash_table(p) \
827 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
828 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
829
830 #define elf_i386_compute_jump_table_size(htab) \
831 ((htab)->next_tls_desc_index * 4)
832
833 /* Create an entry in an i386 ELF linker hash table. */
834
835 static struct bfd_hash_entry *
elf_i386_link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)836 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
837 struct bfd_hash_table *table,
838 const char *string)
839 {
840 /* Allocate the structure if it has not already been allocated by a
841 subclass. */
842 if (entry == NULL)
843 {
844 entry = (struct bfd_hash_entry *)
845 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
846 if (entry == NULL)
847 return entry;
848 }
849
850 /* Call the allocation method of the superclass. */
851 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
852 if (entry != NULL)
853 {
854 struct elf_i386_link_hash_entry *eh;
855
856 eh = (struct elf_i386_link_hash_entry *) entry;
857 eh->dyn_relocs = NULL;
858 eh->tls_type = GOT_UNKNOWN;
859 eh->tlsdesc_got = (bfd_vma) -1;
860 }
861
862 return entry;
863 }
864
865 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
866 for local symbol so that we can handle local STT_GNU_IFUNC symbols
867 as global symbol. We reuse indx and dynstr_index for local symbol
868 hash since they aren't used by global symbols in this backend. */
869
870 static hashval_t
elf_i386_local_htab_hash(const void * ptr)871 elf_i386_local_htab_hash (const void *ptr)
872 {
873 struct elf_link_hash_entry *h
874 = (struct elf_link_hash_entry *) ptr;
875 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
876 }
877
878 /* Compare local hash entries. */
879
880 static int
elf_i386_local_htab_eq(const void * ptr1,const void * ptr2)881 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
882 {
883 struct elf_link_hash_entry *h1
884 = (struct elf_link_hash_entry *) ptr1;
885 struct elf_link_hash_entry *h2
886 = (struct elf_link_hash_entry *) ptr2;
887
888 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
889 }
890
891 /* Find and/or create a hash entry for local symbol. */
892
893 static struct elf_link_hash_entry *
elf_i386_get_local_sym_hash(struct elf_i386_link_hash_table * htab,bfd * abfd,const Elf_Internal_Rela * rel,bfd_boolean create)894 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
895 bfd *abfd, const Elf_Internal_Rela *rel,
896 bfd_boolean create)
897 {
898 struct elf_i386_link_hash_entry e, *ret;
899 asection *sec = abfd->sections;
900 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
901 ELF32_R_SYM (rel->r_info));
902 void **slot;
903
904 e.elf.indx = sec->id;
905 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
906 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
907 create ? INSERT : NO_INSERT);
908
909 if (!slot)
910 return NULL;
911
912 if (*slot)
913 {
914 ret = (struct elf_i386_link_hash_entry *) *slot;
915 return &ret->elf;
916 }
917
918 ret = (struct elf_i386_link_hash_entry *)
919 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
920 sizeof (struct elf_i386_link_hash_entry));
921 if (ret)
922 {
923 memset (ret, 0, sizeof (*ret));
924 ret->elf.indx = sec->id;
925 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
926 ret->elf.dynindx = -1;
927 *slot = ret;
928 }
929 return &ret->elf;
930 }
931
932 /* Create an i386 ELF linker hash table. */
933
934 static struct bfd_link_hash_table *
elf_i386_link_hash_table_create(bfd * abfd)935 elf_i386_link_hash_table_create (bfd *abfd)
936 {
937 struct elf_i386_link_hash_table *ret;
938 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
939
940 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
941 if (ret == NULL)
942 return NULL;
943
944 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
945 elf_i386_link_hash_newfunc,
946 sizeof (struct elf_i386_link_hash_entry),
947 I386_ELF_DATA))
948 {
949 free (ret);
950 return NULL;
951 }
952
953 ret->loc_hash_table = htab_try_create (1024,
954 elf_i386_local_htab_hash,
955 elf_i386_local_htab_eq,
956 NULL);
957 ret->loc_hash_memory = objalloc_create ();
958 if (!ret->loc_hash_table || !ret->loc_hash_memory)
959 {
960 free (ret);
961 return NULL;
962 }
963
964 return &ret->elf.root;
965 }
966
967 /* Destroy an i386 ELF linker hash table. */
968
969 static void
elf_i386_link_hash_table_free(struct bfd_link_hash_table * hash)970 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
971 {
972 struct elf_i386_link_hash_table *htab
973 = (struct elf_i386_link_hash_table *) hash;
974
975 if (htab->loc_hash_table)
976 htab_delete (htab->loc_hash_table);
977 if (htab->loc_hash_memory)
978 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
979 _bfd_elf_link_hash_table_free (hash);
980 }
981
982 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
983 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
984 hash table. */
985
986 static bfd_boolean
elf_i386_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)987 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
988 {
989 struct elf_i386_link_hash_table *htab;
990
991 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
992 return FALSE;
993
994 htab = elf_i386_hash_table (info);
995 if (htab == NULL)
996 return FALSE;
997
998 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
999 if (!info->shared)
1000 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1001
1002 if (!htab->sdynbss
1003 || (!info->shared && !htab->srelbss))
1004 abort ();
1005
1006 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1007 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1008 &htab->srelplt2))
1009 return FALSE;
1010
1011 if (!info->no_ld_generated_unwind_info
1012 && htab->plt_eh_frame == NULL
1013 && htab->elf.splt != NULL)
1014 {
1015 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1016 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1017 | SEC_LINKER_CREATED);
1018 htab->plt_eh_frame
1019 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1020 if (htab->plt_eh_frame == NULL
1021 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1022 return FALSE;
1023 }
1024
1025 return TRUE;
1026 }
1027
1028 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1029
1030 static void
elf_i386_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)1031 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1032 struct elf_link_hash_entry *dir,
1033 struct elf_link_hash_entry *ind)
1034 {
1035 struct elf_i386_link_hash_entry *edir, *eind;
1036
1037 edir = (struct elf_i386_link_hash_entry *) dir;
1038 eind = (struct elf_i386_link_hash_entry *) ind;
1039
1040 if (eind->dyn_relocs != NULL)
1041 {
1042 if (edir->dyn_relocs != NULL)
1043 {
1044 struct elf_dyn_relocs **pp;
1045 struct elf_dyn_relocs *p;
1046
1047 /* Add reloc counts against the indirect sym to the direct sym
1048 list. Merge any entries against the same section. */
1049 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1050 {
1051 struct elf_dyn_relocs *q;
1052
1053 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1054 if (q->sec == p->sec)
1055 {
1056 q->pc_count += p->pc_count;
1057 q->count += p->count;
1058 *pp = p->next;
1059 break;
1060 }
1061 if (q == NULL)
1062 pp = &p->next;
1063 }
1064 *pp = edir->dyn_relocs;
1065 }
1066
1067 edir->dyn_relocs = eind->dyn_relocs;
1068 eind->dyn_relocs = NULL;
1069 }
1070
1071 if (ind->root.type == bfd_link_hash_indirect
1072 && dir->got.refcount <= 0)
1073 {
1074 edir->tls_type = eind->tls_type;
1075 eind->tls_type = GOT_UNKNOWN;
1076 }
1077
1078 if (ELIMINATE_COPY_RELOCS
1079 && ind->root.type != bfd_link_hash_indirect
1080 && dir->dynamic_adjusted)
1081 {
1082 /* If called to transfer flags for a weakdef during processing
1083 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1084 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1085 dir->ref_dynamic |= ind->ref_dynamic;
1086 dir->ref_regular |= ind->ref_regular;
1087 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1088 dir->needs_plt |= ind->needs_plt;
1089 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1090 }
1091 else
1092 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1093 }
1094
1095 /* Return TRUE if the TLS access code sequence support transition
1096 from R_TYPE. */
1097
1098 static bfd_boolean
elf_i386_check_tls_transition(bfd * abfd,asection * sec,bfd_byte * contents,Elf_Internal_Shdr * symtab_hdr,struct elf_link_hash_entry ** sym_hashes,unsigned int r_type,const Elf_Internal_Rela * rel,const Elf_Internal_Rela * relend)1099 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1100 bfd_byte *contents,
1101 Elf_Internal_Shdr *symtab_hdr,
1102 struct elf_link_hash_entry **sym_hashes,
1103 unsigned int r_type,
1104 const Elf_Internal_Rela *rel,
1105 const Elf_Internal_Rela *relend)
1106 {
1107 unsigned int val, type;
1108 unsigned long r_symndx;
1109 struct elf_link_hash_entry *h;
1110 bfd_vma offset;
1111
1112 /* Get the section contents. */
1113 if (contents == NULL)
1114 {
1115 if (elf_section_data (sec)->this_hdr.contents != NULL)
1116 contents = elf_section_data (sec)->this_hdr.contents;
1117 else
1118 {
1119 /* FIXME: How to better handle error condition? */
1120 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1121 return FALSE;
1122
1123 /* Cache the section contents for elf_link_input_bfd. */
1124 elf_section_data (sec)->this_hdr.contents = contents;
1125 }
1126 }
1127
1128 offset = rel->r_offset;
1129 switch (r_type)
1130 {
1131 case R_386_TLS_GD:
1132 case R_386_TLS_LDM:
1133 if (offset < 2 || (rel + 1) >= relend)
1134 return FALSE;
1135
1136 type = bfd_get_8 (abfd, contents + offset - 2);
1137 if (r_type == R_386_TLS_GD)
1138 {
1139 /* Check transition from GD access model. Only
1140 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1141 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1142 can transit to different access model. */
1143 if ((offset + 10) > sec->size ||
1144 (type != 0x8d && type != 0x04))
1145 return FALSE;
1146
1147 val = bfd_get_8 (abfd, contents + offset - 1);
1148 if (type == 0x04)
1149 {
1150 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1151 if (offset < 3)
1152 return FALSE;
1153
1154 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1155 return FALSE;
1156
1157 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1158 return FALSE;
1159 }
1160 else
1161 {
1162 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1163 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1167 return FALSE;
1168 }
1169 }
1170 else
1171 {
1172 /* Check transition from LD access model. Only
1173 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1174 can transit to different access model. */
1175 if (type != 0x8d || (offset + 9) > sec->size)
1176 return FALSE;
1177
1178 val = bfd_get_8 (abfd, contents + offset - 1);
1179 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1180 return FALSE;
1181 }
1182
1183 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1184 return FALSE;
1185
1186 r_symndx = ELF32_R_SYM (rel[1].r_info);
1187 if (r_symndx < symtab_hdr->sh_info)
1188 return FALSE;
1189
1190 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1191 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1192 may be versioned. */
1193 return (h != NULL
1194 && h->root.root.string != NULL
1195 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1196 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1197 && (strncmp (h->root.root.string, "___tls_get_addr",
1198 15) == 0));
1199
1200 case R_386_TLS_IE:
1201 /* Check transition from IE access model:
1202 movl foo@indntpoff(%rip), %eax
1203 movl foo@indntpoff(%rip), %reg
1204 addl foo@indntpoff(%rip), %reg
1205 */
1206
1207 if (offset < 1 || (offset + 4) > sec->size)
1208 return FALSE;
1209
1210 /* Check "movl foo@tpoff(%rip), %eax" first. */
1211 val = bfd_get_8 (abfd, contents + offset - 1);
1212 if (val == 0xa1)
1213 return TRUE;
1214
1215 if (offset < 2)
1216 return FALSE;
1217
1218 /* Check movl|addl foo@tpoff(%rip), %reg. */
1219 type = bfd_get_8 (abfd, contents + offset - 2);
1220 return ((type == 0x8b || type == 0x03)
1221 && (val & 0xc7) == 0x05);
1222
1223 case R_386_TLS_GOTIE:
1224 case R_386_TLS_IE_32:
1225 /* Check transition from {IE_32,GOTIE} access model:
1226 subl foo@{tpoff,gontoff}(%reg1), %reg2
1227 movl foo@{tpoff,gontoff}(%reg1), %reg2
1228 addl foo@{tpoff,gontoff}(%reg1), %reg2
1229 */
1230
1231 if (offset < 2 || (offset + 4) > sec->size)
1232 return FALSE;
1233
1234 val = bfd_get_8 (abfd, contents + offset - 1);
1235 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1236 return FALSE;
1237
1238 type = bfd_get_8 (abfd, contents + offset - 2);
1239 return type == 0x8b || type == 0x2b || type == 0x03;
1240
1241 case R_386_TLS_GOTDESC:
1242 /* Check transition from GDesc access model:
1243 leal x@tlsdesc(%ebx), %eax
1244
1245 Make sure it's a leal adding ebx to a 32-bit offset
1246 into any register, although it's probably almost always
1247 going to be eax. */
1248
1249 if (offset < 2 || (offset + 4) > sec->size)
1250 return FALSE;
1251
1252 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1253 return FALSE;
1254
1255 val = bfd_get_8 (abfd, contents + offset - 1);
1256 return (val & 0xc7) == 0x83;
1257
1258 case R_386_TLS_DESC_CALL:
1259 /* Check transition from GDesc access model:
1260 call *x@tlsdesc(%rax)
1261 */
1262 if (offset + 2 <= sec->size)
1263 {
1264 /* Make sure that it's a call *x@tlsdesc(%rax). */
1265 static const unsigned char call[] = { 0xff, 0x10 };
1266 return memcmp (contents + offset, call, 2) == 0;
1267 }
1268
1269 return FALSE;
1270
1271 default:
1272 abort ();
1273 }
1274 }
1275
1276 /* Return TRUE if the TLS access transition is OK or no transition
1277 will be performed. Update R_TYPE if there is a transition. */
1278
1279 static bfd_boolean
elf_i386_tls_transition(struct bfd_link_info * info,bfd * abfd,asection * sec,bfd_byte * contents,Elf_Internal_Shdr * symtab_hdr,struct elf_link_hash_entry ** sym_hashes,unsigned int * r_type,int tls_type,const Elf_Internal_Rela * rel,const Elf_Internal_Rela * relend,struct elf_link_hash_entry * h,unsigned long r_symndx)1280 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1281 asection *sec, bfd_byte *contents,
1282 Elf_Internal_Shdr *symtab_hdr,
1283 struct elf_link_hash_entry **sym_hashes,
1284 unsigned int *r_type, int tls_type,
1285 const Elf_Internal_Rela *rel,
1286 const Elf_Internal_Rela *relend,
1287 struct elf_link_hash_entry *h,
1288 unsigned long r_symndx)
1289 {
1290 unsigned int from_type = *r_type;
1291 unsigned int to_type = from_type;
1292 bfd_boolean check = TRUE;
1293
1294 /* Skip TLS transition for functions. */
1295 if (h != NULL
1296 && (h->type == STT_FUNC
1297 || h->type == STT_GNU_IFUNC))
1298 return TRUE;
1299
1300 switch (from_type)
1301 {
1302 case R_386_TLS_GD:
1303 case R_386_TLS_GOTDESC:
1304 case R_386_TLS_DESC_CALL:
1305 case R_386_TLS_IE_32:
1306 case R_386_TLS_IE:
1307 case R_386_TLS_GOTIE:
1308 if (info->executable)
1309 {
1310 if (h == NULL)
1311 to_type = R_386_TLS_LE_32;
1312 else if (from_type != R_386_TLS_IE
1313 && from_type != R_386_TLS_GOTIE)
1314 to_type = R_386_TLS_IE_32;
1315 }
1316
1317 /* When we are called from elf_i386_relocate_section, CONTENTS
1318 isn't NULL and there may be additional transitions based on
1319 TLS_TYPE. */
1320 if (contents != NULL)
1321 {
1322 unsigned int new_to_type = to_type;
1323
1324 if (info->executable
1325 && h != NULL
1326 && h->dynindx == -1
1327 && (tls_type & GOT_TLS_IE))
1328 new_to_type = R_386_TLS_LE_32;
1329
1330 if (to_type == R_386_TLS_GD
1331 || to_type == R_386_TLS_GOTDESC
1332 || to_type == R_386_TLS_DESC_CALL)
1333 {
1334 if (tls_type == GOT_TLS_IE_POS)
1335 new_to_type = R_386_TLS_GOTIE;
1336 else if (tls_type & GOT_TLS_IE)
1337 new_to_type = R_386_TLS_IE_32;
1338 }
1339
1340 /* We checked the transition before when we were called from
1341 elf_i386_check_relocs. We only want to check the new
1342 transition which hasn't been checked before. */
1343 check = new_to_type != to_type && from_type == to_type;
1344 to_type = new_to_type;
1345 }
1346
1347 break;
1348
1349 case R_386_TLS_LDM:
1350 if (info->executable)
1351 to_type = R_386_TLS_LE_32;
1352 break;
1353
1354 default:
1355 return TRUE;
1356 }
1357
1358 /* Return TRUE if there is no transition. */
1359 if (from_type == to_type)
1360 return TRUE;
1361
1362 /* Check if the transition can be performed. */
1363 if (check
1364 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1365 symtab_hdr, sym_hashes,
1366 from_type, rel, relend))
1367 {
1368 reloc_howto_type *from, *to;
1369 const char *name;
1370
1371 from = elf_i386_rtype_to_howto (abfd, from_type);
1372 to = elf_i386_rtype_to_howto (abfd, to_type);
1373
1374 if (h)
1375 name = h->root.root.string;
1376 else
1377 {
1378 struct elf_i386_link_hash_table *htab;
1379
1380 htab = elf_i386_hash_table (info);
1381 if (htab == NULL)
1382 name = "*unknown*";
1383 else
1384 {
1385 Elf_Internal_Sym *isym;
1386
1387 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1388 abfd, r_symndx);
1389 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1390 }
1391 }
1392
1393 (*_bfd_error_handler)
1394 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1395 "in section `%A' failed"),
1396 abfd, sec, from->name, to->name, name,
1397 (unsigned long) rel->r_offset);
1398 bfd_set_error (bfd_error_bad_value);
1399 return FALSE;
1400 }
1401
1402 *r_type = to_type;
1403 return TRUE;
1404 }
1405
1406 /* Look through the relocs for a section during the first phase, and
1407 calculate needed space in the global offset table, procedure linkage
1408 table, and dynamic reloc sections. */
1409
1410 static bfd_boolean
elf_i386_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1411 elf_i386_check_relocs (bfd *abfd,
1412 struct bfd_link_info *info,
1413 asection *sec,
1414 const Elf_Internal_Rela *relocs)
1415 {
1416 struct elf_i386_link_hash_table *htab;
1417 Elf_Internal_Shdr *symtab_hdr;
1418 struct elf_link_hash_entry **sym_hashes;
1419 const Elf_Internal_Rela *rel;
1420 const Elf_Internal_Rela *rel_end;
1421 asection *sreloc;
1422
1423 if (info->relocatable)
1424 return TRUE;
1425
1426 BFD_ASSERT (is_i386_elf (abfd));
1427
1428 htab = elf_i386_hash_table (info);
1429 if (htab == NULL)
1430 return FALSE;
1431
1432 symtab_hdr = &elf_symtab_hdr (abfd);
1433 sym_hashes = elf_sym_hashes (abfd);
1434
1435 sreloc = NULL;
1436
1437 rel_end = relocs + sec->reloc_count;
1438 for (rel = relocs; rel < rel_end; rel++)
1439 {
1440 unsigned int r_type;
1441 unsigned long r_symndx;
1442 struct elf_link_hash_entry *h;
1443 Elf_Internal_Sym *isym;
1444 const char *name;
1445 bfd_boolean size_reloc;
1446
1447 r_symndx = ELF32_R_SYM (rel->r_info);
1448 r_type = ELF32_R_TYPE (rel->r_info);
1449
1450 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1451 {
1452 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1453 abfd,
1454 r_symndx);
1455 return FALSE;
1456 }
1457
1458 if (r_symndx < symtab_hdr->sh_info)
1459 {
1460 /* A local symbol. */
1461 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1462 abfd, r_symndx);
1463 if (isym == NULL)
1464 return FALSE;
1465
1466 /* Check relocation against local STT_GNU_IFUNC symbol. */
1467 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1468 {
1469 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1470 if (h == NULL)
1471 return FALSE;
1472
1473 /* Fake a STT_GNU_IFUNC symbol. */
1474 h->type = STT_GNU_IFUNC;
1475 h->def_regular = 1;
1476 h->ref_regular = 1;
1477 h->forced_local = 1;
1478 h->root.type = bfd_link_hash_defined;
1479 }
1480 else
1481 h = NULL;
1482 }
1483 else
1484 {
1485 isym = NULL;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 while (h->root.type == bfd_link_hash_indirect
1488 || h->root.type == bfd_link_hash_warning)
1489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1490 }
1491
1492 if (h != NULL)
1493 {
1494 /* Create the ifunc sections for static executables. If we
1495 never see an indirect function symbol nor we are building
1496 a static executable, those sections will be empty and
1497 won't appear in output. */
1498 switch (r_type)
1499 {
1500 default:
1501 break;
1502
1503 case R_386_32:
1504 case R_386_PC32:
1505 case R_386_PLT32:
1506 case R_386_GOT32:
1507 case R_386_GOTOFF:
1508 if (htab->elf.dynobj == NULL)
1509 htab->elf.dynobj = abfd;
1510 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1511 return FALSE;
1512 break;
1513 }
1514
1515 /* It is referenced by a non-shared object. */
1516 h->ref_regular = 1;
1517 }
1518
1519 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1520 symtab_hdr, sym_hashes,
1521 &r_type, GOT_UNKNOWN,
1522 rel, rel_end, h, r_symndx))
1523 return FALSE;
1524
1525 switch (r_type)
1526 {
1527 case R_386_TLS_LDM:
1528 htab->tls_ldm_got.refcount += 1;
1529 goto create_got;
1530
1531 case R_386_PLT32:
1532 /* This symbol requires a procedure linkage table entry. We
1533 actually build the entry in adjust_dynamic_symbol,
1534 because this might be a case of linking PIC code which is
1535 never referenced by a dynamic object, in which case we
1536 don't need to generate a procedure linkage table entry
1537 after all. */
1538
1539 /* If this is a local symbol, we resolve it directly without
1540 creating a procedure linkage table entry. */
1541 if (h == NULL)
1542 continue;
1543
1544 h->needs_plt = 1;
1545 h->plt.refcount += 1;
1546 break;
1547
1548 case R_386_SIZE32:
1549 size_reloc = TRUE;
1550 goto do_size;
1551
1552 case R_386_TLS_IE_32:
1553 case R_386_TLS_IE:
1554 case R_386_TLS_GOTIE:
1555 if (!info->executable)
1556 info->flags |= DF_STATIC_TLS;
1557 /* Fall through */
1558
1559 case R_386_GOT32:
1560 case R_386_TLS_GD:
1561 case R_386_TLS_GOTDESC:
1562 case R_386_TLS_DESC_CALL:
1563 /* This symbol requires a global offset table entry. */
1564 {
1565 int tls_type, old_tls_type;
1566
1567 switch (r_type)
1568 {
1569 default:
1570 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1571 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1572 case R_386_TLS_GOTDESC:
1573 case R_386_TLS_DESC_CALL:
1574 tls_type = GOT_TLS_GDESC; break;
1575 case R_386_TLS_IE_32:
1576 if (ELF32_R_TYPE (rel->r_info) == r_type)
1577 tls_type = GOT_TLS_IE_NEG;
1578 else
1579 /* If this is a GD->IE transition, we may use either of
1580 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1581 tls_type = GOT_TLS_IE;
1582 break;
1583 case R_386_TLS_IE:
1584 case R_386_TLS_GOTIE:
1585 tls_type = GOT_TLS_IE_POS; break;
1586 }
1587
1588 if (h != NULL)
1589 {
1590 h->got.refcount += 1;
1591 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1592 }
1593 else
1594 {
1595 bfd_signed_vma *local_got_refcounts;
1596
1597 /* This is a global offset table entry for a local symbol. */
1598 local_got_refcounts = elf_local_got_refcounts (abfd);
1599 if (local_got_refcounts == NULL)
1600 {
1601 bfd_size_type size;
1602
1603 size = symtab_hdr->sh_info;
1604 size *= (sizeof (bfd_signed_vma)
1605 + sizeof (bfd_vma) + sizeof(char));
1606 local_got_refcounts = (bfd_signed_vma *)
1607 bfd_zalloc (abfd, size);
1608 if (local_got_refcounts == NULL)
1609 return FALSE;
1610 elf_local_got_refcounts (abfd) = local_got_refcounts;
1611 elf_i386_local_tlsdesc_gotent (abfd)
1612 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1613 elf_i386_local_got_tls_type (abfd)
1614 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1615 }
1616 local_got_refcounts[r_symndx] += 1;
1617 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1618 }
1619
1620 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1621 tls_type |= old_tls_type;
1622 /* If a TLS symbol is accessed using IE at least once,
1623 there is no point to use dynamic model for it. */
1624 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1625 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1626 || (tls_type & GOT_TLS_IE) == 0))
1627 {
1628 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1629 tls_type = old_tls_type;
1630 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1631 && GOT_TLS_GD_ANY_P (tls_type))
1632 tls_type |= old_tls_type;
1633 else
1634 {
1635 if (h)
1636 name = h->root.root.string;
1637 else
1638 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1639 NULL);
1640 (*_bfd_error_handler)
1641 (_("%B: `%s' accessed both as normal and "
1642 "thread local symbol"),
1643 abfd, name);
1644 bfd_set_error (bfd_error_bad_value);
1645 return FALSE;
1646 }
1647 }
1648
1649 if (old_tls_type != tls_type)
1650 {
1651 if (h != NULL)
1652 elf_i386_hash_entry (h)->tls_type = tls_type;
1653 else
1654 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1655 }
1656 }
1657 /* Fall through */
1658
1659 case R_386_GOTOFF:
1660 case R_386_GOTPC:
1661 create_got:
1662 if (htab->elf.sgot == NULL)
1663 {
1664 if (htab->elf.dynobj == NULL)
1665 htab->elf.dynobj = abfd;
1666 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1667 return FALSE;
1668 }
1669 if (r_type != R_386_TLS_IE)
1670 break;
1671 /* Fall through */
1672
1673 case R_386_TLS_LE_32:
1674 case R_386_TLS_LE:
1675 if (info->executable)
1676 break;
1677 info->flags |= DF_STATIC_TLS;
1678 /* Fall through */
1679
1680 case R_386_32:
1681 case R_386_PC32:
1682 if (h != NULL && info->executable)
1683 {
1684 /* If this reloc is in a read-only section, we might
1685 need a copy reloc. We can't check reliably at this
1686 stage whether the section is read-only, as input
1687 sections have not yet been mapped to output sections.
1688 Tentatively set the flag for now, and correct in
1689 adjust_dynamic_symbol. */
1690 h->non_got_ref = 1;
1691
1692 /* We may need a .plt entry if the function this reloc
1693 refers to is in a shared lib. */
1694 h->plt.refcount += 1;
1695 if (r_type != R_386_PC32)
1696 h->pointer_equality_needed = 1;
1697 }
1698
1699 size_reloc = FALSE;
1700 do_size:
1701 /* If we are creating a shared library, and this is a reloc
1702 against a global symbol, or a non PC relative reloc
1703 against a local symbol, then we need to copy the reloc
1704 into the shared library. However, if we are linking with
1705 -Bsymbolic, we do not need to copy a reloc against a
1706 global symbol which is defined in an object we are
1707 including in the link (i.e., DEF_REGULAR is set). At
1708 this point we have not seen all the input files, so it is
1709 possible that DEF_REGULAR is not set now but will be set
1710 later (it is never cleared). In case of a weak definition,
1711 DEF_REGULAR may be cleared later by a strong definition in
1712 a shared library. We account for that possibility below by
1713 storing information in the relocs_copied field of the hash
1714 table entry. A similar situation occurs when creating
1715 shared libraries and symbol visibility changes render the
1716 symbol local.
1717
1718 If on the other hand, we are creating an executable, we
1719 may need to keep relocations for symbols satisfied by a
1720 dynamic library if we manage to avoid copy relocs for the
1721 symbol. */
1722 if ((info->shared
1723 && (sec->flags & SEC_ALLOC) != 0
1724 && (r_type != R_386_PC32
1725 || (h != NULL
1726 && (! SYMBOLIC_BIND (info, h)
1727 || h->root.type == bfd_link_hash_defweak
1728 || !h->def_regular))))
1729 || (ELIMINATE_COPY_RELOCS
1730 && !info->shared
1731 && (sec->flags & SEC_ALLOC) != 0
1732 && h != NULL
1733 && (h->root.type == bfd_link_hash_defweak
1734 || !h->def_regular)))
1735 {
1736 struct elf_dyn_relocs *p;
1737 struct elf_dyn_relocs **head;
1738
1739 /* We must copy these reloc types into the output file.
1740 Create a reloc section in dynobj and make room for
1741 this reloc. */
1742 if (sreloc == NULL)
1743 {
1744 if (htab->elf.dynobj == NULL)
1745 htab->elf.dynobj = abfd;
1746
1747 sreloc = _bfd_elf_make_dynamic_reloc_section
1748 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1749
1750 if (sreloc == NULL)
1751 return FALSE;
1752 }
1753
1754 /* If this is a global symbol, we count the number of
1755 relocations we need for this symbol. */
1756 if (h != NULL)
1757 {
1758 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1759 }
1760 else
1761 {
1762 /* Track dynamic relocs needed for local syms too.
1763 We really need local syms available to do this
1764 easily. Oh well. */
1765 void **vpp;
1766 asection *s;
1767
1768 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1769 abfd, r_symndx);
1770 if (isym == NULL)
1771 return FALSE;
1772
1773 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1774 if (s == NULL)
1775 s = sec;
1776
1777 vpp = &elf_section_data (s)->local_dynrel;
1778 head = (struct elf_dyn_relocs **)vpp;
1779 }
1780
1781 p = *head;
1782 if (p == NULL || p->sec != sec)
1783 {
1784 bfd_size_type amt = sizeof *p;
1785 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1786 amt);
1787 if (p == NULL)
1788 return FALSE;
1789 p->next = *head;
1790 *head = p;
1791 p->sec = sec;
1792 p->count = 0;
1793 p->pc_count = 0;
1794 }
1795
1796 p->count += 1;
1797 /* Count size relocation as PC-relative relocation. */
1798 if (r_type == R_386_PC32 || size_reloc)
1799 p->pc_count += 1;
1800 }
1801 break;
1802
1803 /* This relocation describes the C++ object vtable hierarchy.
1804 Reconstruct it for later use during GC. */
1805 case R_386_GNU_VTINHERIT:
1806 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1807 return FALSE;
1808 break;
1809
1810 /* This relocation describes which C++ vtable entries are actually
1811 used. Record for later use during GC. */
1812 case R_386_GNU_VTENTRY:
1813 BFD_ASSERT (h != NULL);
1814 if (h != NULL
1815 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1816 return FALSE;
1817 break;
1818
1819 default:
1820 break;
1821 }
1822 }
1823
1824 return TRUE;
1825 }
1826
1827 /* Return the section that should be marked against GC for a given
1828 relocation. */
1829
1830 static asection *
elf_i386_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1831 elf_i386_gc_mark_hook (asection *sec,
1832 struct bfd_link_info *info,
1833 Elf_Internal_Rela *rel,
1834 struct elf_link_hash_entry *h,
1835 Elf_Internal_Sym *sym)
1836 {
1837 if (h != NULL)
1838 switch (ELF32_R_TYPE (rel->r_info))
1839 {
1840 case R_386_GNU_VTINHERIT:
1841 case R_386_GNU_VTENTRY:
1842 return NULL;
1843 }
1844
1845 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1846 }
1847
1848 /* Update the got entry reference counts for the section being removed. */
1849
1850 static bfd_boolean
elf_i386_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1851 elf_i386_gc_sweep_hook (bfd *abfd,
1852 struct bfd_link_info *info,
1853 asection *sec,
1854 const Elf_Internal_Rela *relocs)
1855 {
1856 struct elf_i386_link_hash_table *htab;
1857 Elf_Internal_Shdr *symtab_hdr;
1858 struct elf_link_hash_entry **sym_hashes;
1859 bfd_signed_vma *local_got_refcounts;
1860 const Elf_Internal_Rela *rel, *relend;
1861
1862 if (info->relocatable)
1863 return TRUE;
1864
1865 htab = elf_i386_hash_table (info);
1866 if (htab == NULL)
1867 return FALSE;
1868
1869 elf_section_data (sec)->local_dynrel = NULL;
1870
1871 symtab_hdr = &elf_symtab_hdr (abfd);
1872 sym_hashes = elf_sym_hashes (abfd);
1873 local_got_refcounts = elf_local_got_refcounts (abfd);
1874
1875 relend = relocs + sec->reloc_count;
1876 for (rel = relocs; rel < relend; rel++)
1877 {
1878 unsigned long r_symndx;
1879 unsigned int r_type;
1880 struct elf_link_hash_entry *h = NULL;
1881
1882 r_symndx = ELF32_R_SYM (rel->r_info);
1883 if (r_symndx >= symtab_hdr->sh_info)
1884 {
1885 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1886 while (h->root.type == bfd_link_hash_indirect
1887 || h->root.type == bfd_link_hash_warning)
1888 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1889 }
1890 else
1891 {
1892 /* A local symbol. */
1893 Elf_Internal_Sym *isym;
1894
1895 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1896 abfd, r_symndx);
1897
1898 /* Check relocation against local STT_GNU_IFUNC symbol. */
1899 if (isym != NULL
1900 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1901 {
1902 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1903 if (h == NULL)
1904 abort ();
1905 }
1906 }
1907
1908 if (h)
1909 {
1910 struct elf_i386_link_hash_entry *eh;
1911 struct elf_dyn_relocs **pp;
1912 struct elf_dyn_relocs *p;
1913
1914 eh = (struct elf_i386_link_hash_entry *) h;
1915 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1916 if (p->sec == sec)
1917 {
1918 /* Everything must go for SEC. */
1919 *pp = p->next;
1920 break;
1921 }
1922 }
1923
1924 r_type = ELF32_R_TYPE (rel->r_info);
1925 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1926 symtab_hdr, sym_hashes,
1927 &r_type, GOT_UNKNOWN,
1928 rel, relend, h, r_symndx))
1929 return FALSE;
1930
1931 switch (r_type)
1932 {
1933 case R_386_TLS_LDM:
1934 if (htab->tls_ldm_got.refcount > 0)
1935 htab->tls_ldm_got.refcount -= 1;
1936 break;
1937
1938 case R_386_TLS_GD:
1939 case R_386_TLS_GOTDESC:
1940 case R_386_TLS_DESC_CALL:
1941 case R_386_TLS_IE_32:
1942 case R_386_TLS_IE:
1943 case R_386_TLS_GOTIE:
1944 case R_386_GOT32:
1945 if (h != NULL)
1946 {
1947 if (h->got.refcount > 0)
1948 h->got.refcount -= 1;
1949 if (h->type == STT_GNU_IFUNC)
1950 {
1951 if (h->plt.refcount > 0)
1952 h->plt.refcount -= 1;
1953 }
1954 }
1955 else if (local_got_refcounts != NULL)
1956 {
1957 if (local_got_refcounts[r_symndx] > 0)
1958 local_got_refcounts[r_symndx] -= 1;
1959 }
1960 break;
1961
1962 case R_386_32:
1963 case R_386_PC32:
1964 case R_386_SIZE32:
1965 if (info->shared
1966 && (h == NULL || h->type != STT_GNU_IFUNC))
1967 break;
1968 /* Fall through */
1969
1970 case R_386_PLT32:
1971 if (h != NULL)
1972 {
1973 if (h->plt.refcount > 0)
1974 h->plt.refcount -= 1;
1975 }
1976 break;
1977
1978 case R_386_GOTOFF:
1979 if (h != NULL && h->type == STT_GNU_IFUNC)
1980 {
1981 if (h->got.refcount > 0)
1982 h->got.refcount -= 1;
1983 if (h->plt.refcount > 0)
1984 h->plt.refcount -= 1;
1985 }
1986 break;
1987
1988 default:
1989 break;
1990 }
1991 }
1992
1993 return TRUE;
1994 }
1995
1996 /* Adjust a symbol defined by a dynamic object and referenced by a
1997 regular object. The current definition is in some section of the
1998 dynamic object, but we're not including those sections. We have to
1999 change the definition to something the rest of the link can
2000 understand. */
2001
2002 static bfd_boolean
elf_i386_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)2003 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2004 struct elf_link_hash_entry *h)
2005 {
2006 struct elf_i386_link_hash_table *htab;
2007 asection *s;
2008 struct elf_i386_link_hash_entry *eh;
2009 struct elf_dyn_relocs *p;
2010
2011 /* STT_GNU_IFUNC symbol must go through PLT. */
2012 if (h->type == STT_GNU_IFUNC)
2013 {
2014 /* All local STT_GNU_IFUNC references must be treate as local
2015 calls via local PLT. */
2016 if (h->ref_regular
2017 && SYMBOL_CALLS_LOCAL (info, h))
2018 {
2019 bfd_size_type pc_count = 0, count = 0;
2020 struct elf_dyn_relocs **pp;
2021
2022 eh = (struct elf_i386_link_hash_entry *) h;
2023 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2024 {
2025 pc_count += p->pc_count;
2026 p->count -= p->pc_count;
2027 p->pc_count = 0;
2028 count += p->count;
2029 if (p->count == 0)
2030 *pp = p->next;
2031 else
2032 pp = &p->next;
2033 }
2034
2035 if (pc_count || count)
2036 {
2037 h->needs_plt = 1;
2038 h->non_got_ref = 1;
2039 if (h->plt.refcount <= 0)
2040 h->plt.refcount = 1;
2041 else
2042 h->plt.refcount += 1;
2043 }
2044 }
2045
2046 if (h->plt.refcount <= 0)
2047 {
2048 h->plt.offset = (bfd_vma) -1;
2049 h->needs_plt = 0;
2050 }
2051 return TRUE;
2052 }
2053
2054 /* If this is a function, put it in the procedure linkage table. We
2055 will fill in the contents of the procedure linkage table later,
2056 when we know the address of the .got section. */
2057 if (h->type == STT_FUNC
2058 || h->needs_plt)
2059 {
2060 if (h->plt.refcount <= 0
2061 || SYMBOL_CALLS_LOCAL (info, h)
2062 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2063 && h->root.type == bfd_link_hash_undefweak))
2064 {
2065 /* This case can occur if we saw a PLT32 reloc in an input
2066 file, but the symbol was never referred to by a dynamic
2067 object, or if all references were garbage collected. In
2068 such a case, we don't actually need to build a procedure
2069 linkage table, and we can just do a PC32 reloc instead. */
2070 h->plt.offset = (bfd_vma) -1;
2071 h->needs_plt = 0;
2072 }
2073
2074 return TRUE;
2075 }
2076 else
2077 /* It's possible that we incorrectly decided a .plt reloc was
2078 needed for an R_386_PC32 reloc to a non-function sym in
2079 check_relocs. We can't decide accurately between function and
2080 non-function syms in check-relocs; Objects loaded later in
2081 the link may change h->type. So fix it now. */
2082 h->plt.offset = (bfd_vma) -1;
2083
2084 /* If this is a weak symbol, and there is a real definition, the
2085 processor independent code will have arranged for us to see the
2086 real definition first, and we can just use the same value. */
2087 if (h->u.weakdef != NULL)
2088 {
2089 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2090 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2091 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2092 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2093 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2094 h->non_got_ref = h->u.weakdef->non_got_ref;
2095 return TRUE;
2096 }
2097
2098 /* This is a reference to a symbol defined by a dynamic object which
2099 is not a function. */
2100
2101 /* If we are creating a shared library, we must presume that the
2102 only references to the symbol are via the global offset table.
2103 For such cases we need not do anything here; the relocations will
2104 be handled correctly by relocate_section. */
2105 if (info->shared)
2106 return TRUE;
2107
2108 /* If there are no references to this symbol that do not use the
2109 GOT, we don't need to generate a copy reloc. */
2110 if (!h->non_got_ref)
2111 return TRUE;
2112
2113 /* If -z nocopyreloc was given, we won't generate them either. */
2114 if (info->nocopyreloc)
2115 {
2116 h->non_got_ref = 0;
2117 return TRUE;
2118 }
2119
2120 htab = elf_i386_hash_table (info);
2121 if (htab == NULL)
2122 return FALSE;
2123
2124 /* If there aren't any dynamic relocs in read-only sections, then
2125 we can keep the dynamic relocs and avoid the copy reloc. This
2126 doesn't work on VxWorks, where we can not have dynamic relocations
2127 (other than copy and jump slot relocations) in an executable. */
2128 if (ELIMINATE_COPY_RELOCS
2129 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2130 {
2131 eh = (struct elf_i386_link_hash_entry *) h;
2132 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2133 {
2134 s = p->sec->output_section;
2135 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2136 break;
2137 }
2138
2139 if (p == NULL)
2140 {
2141 h->non_got_ref = 0;
2142 return TRUE;
2143 }
2144 }
2145
2146 /* We must allocate the symbol in our .dynbss section, which will
2147 become part of the .bss section of the executable. There will be
2148 an entry for this symbol in the .dynsym section. The dynamic
2149 object will contain position independent code, so all references
2150 from the dynamic object to this symbol will go through the global
2151 offset table. The dynamic linker will use the .dynsym entry to
2152 determine the address it must put in the global offset table, so
2153 both the dynamic object and the regular object will refer to the
2154 same memory location for the variable. */
2155
2156 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2157 copy the initial value out of the dynamic object and into the
2158 runtime process image. */
2159 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2160 {
2161 htab->srelbss->size += sizeof (Elf32_External_Rel);
2162 h->needs_copy = 1;
2163 }
2164
2165 s = htab->sdynbss;
2166
2167 return _bfd_elf_adjust_dynamic_copy (h, s);
2168 }
2169
2170 /* Allocate space in .plt, .got and associated reloc sections for
2171 dynamic relocs. */
2172
2173 static bfd_boolean
elf_i386_allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)2174 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2175 {
2176 struct bfd_link_info *info;
2177 struct elf_i386_link_hash_table *htab;
2178 struct elf_i386_link_hash_entry *eh;
2179 struct elf_dyn_relocs *p;
2180 unsigned plt_entry_size;
2181
2182 if (h->root.type == bfd_link_hash_indirect)
2183 return TRUE;
2184
2185 eh = (struct elf_i386_link_hash_entry *) h;
2186
2187 info = (struct bfd_link_info *) inf;
2188 htab = elf_i386_hash_table (info);
2189 if (htab == NULL)
2190 return FALSE;
2191
2192 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2193
2194 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2195 here if it is defined and referenced in a non-shared object. */
2196 if (h->type == STT_GNU_IFUNC
2197 && h->def_regular)
2198 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2199 plt_entry_size, 4);
2200 else if (htab->elf.dynamic_sections_created
2201 && h->plt.refcount > 0)
2202 {
2203 /* Make sure this symbol is output as a dynamic symbol.
2204 Undefined weak syms won't yet be marked as dynamic. */
2205 if (h->dynindx == -1
2206 && !h->forced_local)
2207 {
2208 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2209 return FALSE;
2210 }
2211
2212 if (info->shared
2213 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2214 {
2215 asection *s = htab->elf.splt;
2216
2217 /* If this is the first .plt entry, make room for the special
2218 first entry. */
2219 if (s->size == 0)
2220 s->size += plt_entry_size;
2221
2222 h->plt.offset = s->size;
2223
2224 /* If this symbol is not defined in a regular file, and we are
2225 not generating a shared library, then set the symbol to this
2226 location in the .plt. This is required to make function
2227 pointers compare as equal between the normal executable and
2228 the shared library. */
2229 if (! info->shared
2230 && !h->def_regular)
2231 {
2232 h->root.u.def.section = s;
2233 h->root.u.def.value = h->plt.offset;
2234 }
2235
2236 /* Make room for this entry. */
2237 s->size += plt_entry_size;
2238
2239 /* We also need to make an entry in the .got.plt section, which
2240 will be placed in the .got section by the linker script. */
2241 htab->elf.sgotplt->size += 4;
2242
2243 /* We also need to make an entry in the .rel.plt section. */
2244 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2245 htab->elf.srelplt->reloc_count++;
2246
2247 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2248 && !info->shared)
2249 {
2250 /* VxWorks has a second set of relocations for each PLT entry
2251 in executables. They go in a separate relocation section,
2252 which is processed by the kernel loader. */
2253
2254 /* There are two relocations for the initial PLT entry: an
2255 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2256 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2257
2258 if (h->plt.offset == plt_entry_size)
2259 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2260
2261 /* There are two extra relocations for each subsequent PLT entry:
2262 an R_386_32 relocation for the GOT entry, and an R_386_32
2263 relocation for the PLT entry. */
2264
2265 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2266 }
2267 }
2268 else
2269 {
2270 h->plt.offset = (bfd_vma) -1;
2271 h->needs_plt = 0;
2272 }
2273 }
2274 else
2275 {
2276 h->plt.offset = (bfd_vma) -1;
2277 h->needs_plt = 0;
2278 }
2279
2280 eh->tlsdesc_got = (bfd_vma) -1;
2281
2282 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2283 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2284 if (h->got.refcount > 0
2285 && info->executable
2286 && h->dynindx == -1
2287 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2288 h->got.offset = (bfd_vma) -1;
2289 else if (h->got.refcount > 0)
2290 {
2291 asection *s;
2292 bfd_boolean dyn;
2293 int tls_type = elf_i386_hash_entry(h)->tls_type;
2294
2295 /* Make sure this symbol is output as a dynamic symbol.
2296 Undefined weak syms won't yet be marked as dynamic. */
2297 if (h->dynindx == -1
2298 && !h->forced_local)
2299 {
2300 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2301 return FALSE;
2302 }
2303
2304 s = htab->elf.sgot;
2305 if (GOT_TLS_GDESC_P (tls_type))
2306 {
2307 eh->tlsdesc_got = htab->elf.sgotplt->size
2308 - elf_i386_compute_jump_table_size (htab);
2309 htab->elf.sgotplt->size += 8;
2310 h->got.offset = (bfd_vma) -2;
2311 }
2312 if (! GOT_TLS_GDESC_P (tls_type)
2313 || GOT_TLS_GD_P (tls_type))
2314 {
2315 h->got.offset = s->size;
2316 s->size += 4;
2317 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2318 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2319 s->size += 4;
2320 }
2321 dyn = htab->elf.dynamic_sections_created;
2322 /* R_386_TLS_IE_32 needs one dynamic relocation,
2323 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2324 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2325 need two), R_386_TLS_GD needs one if local symbol and two if
2326 global. */
2327 if (tls_type == GOT_TLS_IE_BOTH)
2328 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2329 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2330 || (tls_type & GOT_TLS_IE))
2331 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2332 else if (GOT_TLS_GD_P (tls_type))
2333 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2334 else if (! GOT_TLS_GDESC_P (tls_type)
2335 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2336 || h->root.type != bfd_link_hash_undefweak)
2337 && (info->shared
2338 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2339 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2340 if (GOT_TLS_GDESC_P (tls_type))
2341 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2342 }
2343 else
2344 h->got.offset = (bfd_vma) -1;
2345
2346 if (eh->dyn_relocs == NULL)
2347 return TRUE;
2348
2349 /* In the shared -Bsymbolic case, discard space allocated for
2350 dynamic pc-relative relocs against symbols which turn out to be
2351 defined in regular objects. For the normal shared case, discard
2352 space for pc-relative relocs that have become local due to symbol
2353 visibility changes. */
2354
2355 if (info->shared)
2356 {
2357 /* The only reloc that uses pc_count is R_386_PC32, which will
2358 appear on a call or on something like ".long foo - .". We
2359 want calls to protected symbols to resolve directly to the
2360 function rather than going via the plt. If people want
2361 function pointer comparisons to work as expected then they
2362 should avoid writing assembly like ".long foo - .". */
2363 if (SYMBOL_CALLS_LOCAL (info, h))
2364 {
2365 struct elf_dyn_relocs **pp;
2366
2367 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2368 {
2369 p->count -= p->pc_count;
2370 p->pc_count = 0;
2371 if (p->count == 0)
2372 *pp = p->next;
2373 else
2374 pp = &p->next;
2375 }
2376 }
2377
2378 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2379 {
2380 struct elf_dyn_relocs **pp;
2381 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2382 {
2383 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2384 *pp = p->next;
2385 else
2386 pp = &p->next;
2387 }
2388 }
2389
2390 /* Also discard relocs on undefined weak syms with non-default
2391 visibility. */
2392 if (eh->dyn_relocs != NULL
2393 && h->root.type == bfd_link_hash_undefweak)
2394 {
2395 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2396 eh->dyn_relocs = NULL;
2397
2398 /* Make sure undefined weak symbols are output as a dynamic
2399 symbol in PIEs. */
2400 else if (h->dynindx == -1
2401 && !h->forced_local)
2402 {
2403 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2404 return FALSE;
2405 }
2406 }
2407 }
2408 else if (ELIMINATE_COPY_RELOCS)
2409 {
2410 /* For the non-shared case, discard space for relocs against
2411 symbols which turn out to need copy relocs or are not
2412 dynamic. */
2413
2414 if (!h->non_got_ref
2415 && ((h->def_dynamic
2416 && !h->def_regular)
2417 || (htab->elf.dynamic_sections_created
2418 && (h->root.type == bfd_link_hash_undefweak
2419 || h->root.type == bfd_link_hash_undefined))))
2420 {
2421 /* Make sure this symbol is output as a dynamic symbol.
2422 Undefined weak syms won't yet be marked as dynamic. */
2423 if (h->dynindx == -1
2424 && !h->forced_local)
2425 {
2426 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2427 return FALSE;
2428 }
2429
2430 /* If that succeeded, we know we'll be keeping all the
2431 relocs. */
2432 if (h->dynindx != -1)
2433 goto keep;
2434 }
2435
2436 eh->dyn_relocs = NULL;
2437
2438 keep: ;
2439 }
2440
2441 /* Finally, allocate space. */
2442 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2443 {
2444 asection *sreloc;
2445
2446 sreloc = elf_section_data (p->sec)->sreloc;
2447
2448 BFD_ASSERT (sreloc != NULL);
2449 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2450 }
2451
2452 return TRUE;
2453 }
2454
2455 /* Allocate space in .plt, .got and associated reloc sections for
2456 local dynamic relocs. */
2457
2458 static bfd_boolean
elf_i386_allocate_local_dynrelocs(void ** slot,void * inf)2459 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2460 {
2461 struct elf_link_hash_entry *h
2462 = (struct elf_link_hash_entry *) *slot;
2463
2464 if (h->type != STT_GNU_IFUNC
2465 || !h->def_regular
2466 || !h->ref_regular
2467 || !h->forced_local
2468 || h->root.type != bfd_link_hash_defined)
2469 abort ();
2470
2471 return elf_i386_allocate_dynrelocs (h, inf);
2472 }
2473
2474 /* Find any dynamic relocs that apply to read-only sections. */
2475
2476 static bfd_boolean
elf_i386_readonly_dynrelocs(struct elf_link_hash_entry * h,void * inf)2477 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2478 {
2479 struct elf_i386_link_hash_entry *eh;
2480 struct elf_dyn_relocs *p;
2481
2482 /* Skip local IFUNC symbols. */
2483 if (h->forced_local && h->type == STT_GNU_IFUNC)
2484 return TRUE;
2485
2486 eh = (struct elf_i386_link_hash_entry *) h;
2487 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2488 {
2489 asection *s = p->sec->output_section;
2490
2491 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2492 {
2493 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2494
2495 info->flags |= DF_TEXTREL;
2496
2497 if (info->warn_shared_textrel && info->shared)
2498 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2499 p->sec->owner, h->root.root.string,
2500 p->sec);
2501
2502 /* Not an error, just cut short the traversal. */
2503 return FALSE;
2504 }
2505 }
2506 return TRUE;
2507 }
2508
2509 /* Convert
2510 mov foo@GOT(%reg), %reg
2511 to
2512 lea foo@GOTOFF(%reg), %reg
2513 with the local symbol, foo. */
2514
2515 static bfd_boolean
elf_i386_convert_mov_to_lea(bfd * abfd,asection * sec,struct bfd_link_info * link_info)2516 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2517 struct bfd_link_info *link_info)
2518 {
2519 Elf_Internal_Shdr *symtab_hdr;
2520 Elf_Internal_Rela *internal_relocs;
2521 Elf_Internal_Rela *irel, *irelend;
2522 bfd_byte *contents;
2523 struct elf_i386_link_hash_table *htab;
2524 bfd_boolean changed_contents;
2525 bfd_boolean changed_relocs;
2526 bfd_signed_vma *local_got_refcounts;
2527
2528 /* Don't even try to convert non-ELF outputs. */
2529 if (!is_elf_hash_table (link_info->hash))
2530 return FALSE;
2531
2532 /* Nothing to do if there are no codes, no relocations or no output. */
2533 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2534 || sec->reloc_count == 0
2535 || discarded_section (sec))
2536 return TRUE;
2537
2538 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2539
2540 /* Load the relocations for this section. */
2541 internal_relocs = (_bfd_elf_link_read_relocs
2542 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2543 link_info->keep_memory));
2544 if (internal_relocs == NULL)
2545 return FALSE;
2546
2547 htab = elf_i386_hash_table (link_info);
2548 changed_contents = FALSE;
2549 changed_relocs = FALSE;
2550 local_got_refcounts = elf_local_got_refcounts (abfd);
2551
2552 /* Get the section contents. */
2553 if (elf_section_data (sec)->this_hdr.contents != NULL)
2554 contents = elf_section_data (sec)->this_hdr.contents;
2555 else
2556 {
2557 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2558 goto error_return;
2559 }
2560
2561 irelend = internal_relocs + sec->reloc_count;
2562 for (irel = internal_relocs; irel < irelend; irel++)
2563 {
2564 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2565 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2566 unsigned int indx;
2567 struct elf_link_hash_entry *h;
2568
2569 if (r_type != R_386_GOT32)
2570 continue;
2571
2572 /* Get the symbol referred to by the reloc. */
2573 if (r_symndx < symtab_hdr->sh_info)
2574 {
2575 Elf_Internal_Sym *isym;
2576
2577 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2578 abfd, r_symndx);
2579
2580 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2581 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2582 && bfd_get_8 (input_bfd,
2583 contents + irel->r_offset - 2) == 0x8b)
2584 {
2585 bfd_put_8 (output_bfd, 0x8d,
2586 contents + irel->r_offset - 2);
2587 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2588 if (local_got_refcounts != NULL
2589 && local_got_refcounts[r_symndx] > 0)
2590 local_got_refcounts[r_symndx] -= 1;
2591 changed_contents = TRUE;
2592 changed_relocs = TRUE;
2593 }
2594 continue;
2595 }
2596
2597 indx = r_symndx - symtab_hdr->sh_info;
2598 h = elf_sym_hashes (abfd)[indx];
2599 BFD_ASSERT (h != NULL);
2600
2601 while (h->root.type == bfd_link_hash_indirect
2602 || h->root.type == bfd_link_hash_warning)
2603 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2604
2605 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2606 optimizing _DYNAMIC since ld.so may use its link-time address. */
2607 if (h->def_regular
2608 && h->type != STT_GNU_IFUNC
2609 && h != htab->elf.hdynamic
2610 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2611 && bfd_get_8 (input_bfd,
2612 contents + irel->r_offset - 2) == 0x8b)
2613 {
2614 bfd_put_8 (output_bfd, 0x8d,
2615 contents + irel->r_offset - 2);
2616 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2617 if (h->got.refcount > 0)
2618 h->got.refcount -= 1;
2619 changed_contents = TRUE;
2620 changed_relocs = TRUE;
2621 }
2622 }
2623
2624 if (contents != NULL
2625 && elf_section_data (sec)->this_hdr.contents != contents)
2626 {
2627 if (!changed_contents && !link_info->keep_memory)
2628 free (contents);
2629 else
2630 {
2631 /* Cache the section contents for elf_link_input_bfd. */
2632 elf_section_data (sec)->this_hdr.contents = contents;
2633 }
2634 }
2635
2636 if (elf_section_data (sec)->relocs != internal_relocs)
2637 {
2638 if (!changed_relocs)
2639 free (internal_relocs);
2640 else
2641 elf_section_data (sec)->relocs = internal_relocs;
2642 }
2643
2644 return TRUE;
2645
2646 error_return:
2647 if (contents != NULL
2648 && elf_section_data (sec)->this_hdr.contents != contents)
2649 free (contents);
2650 if (internal_relocs != NULL
2651 && elf_section_data (sec)->relocs != internal_relocs)
2652 free (internal_relocs);
2653 return FALSE;
2654 }
2655
2656 /* Set the sizes of the dynamic sections. */
2657
2658 static bfd_boolean
elf_i386_size_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)2659 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2660 {
2661 struct elf_i386_link_hash_table *htab;
2662 bfd *dynobj;
2663 asection *s;
2664 bfd_boolean relocs;
2665 bfd *ibfd;
2666
2667 htab = elf_i386_hash_table (info);
2668 if (htab == NULL)
2669 return FALSE;
2670 dynobj = htab->elf.dynobj;
2671 if (dynobj == NULL)
2672 abort ();
2673
2674 if (htab->elf.dynamic_sections_created)
2675 {
2676 /* Set the contents of the .interp section to the interpreter. */
2677 if (info->executable)
2678 {
2679 s = bfd_get_linker_section (dynobj, ".interp");
2680 if (s == NULL)
2681 abort ();
2682 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2683 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2684 }
2685 }
2686
2687 /* Set up .got offsets for local syms, and space for local dynamic
2688 relocs. */
2689 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2690 {
2691 bfd_signed_vma *local_got;
2692 bfd_signed_vma *end_local_got;
2693 char *local_tls_type;
2694 bfd_vma *local_tlsdesc_gotent;
2695 bfd_size_type locsymcount;
2696 Elf_Internal_Shdr *symtab_hdr;
2697 asection *srel;
2698
2699 if (! is_i386_elf (ibfd))
2700 continue;
2701
2702 for (s = ibfd->sections; s != NULL; s = s->next)
2703 {
2704 struct elf_dyn_relocs *p;
2705
2706 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2707 return FALSE;
2708
2709 for (p = ((struct elf_dyn_relocs *)
2710 elf_section_data (s)->local_dynrel);
2711 p != NULL;
2712 p = p->next)
2713 {
2714 if (!bfd_is_abs_section (p->sec)
2715 && bfd_is_abs_section (p->sec->output_section))
2716 {
2717 /* Input section has been discarded, either because
2718 it is a copy of a linkonce section or due to
2719 linker script /DISCARD/, so we'll be discarding
2720 the relocs too. */
2721 }
2722 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2723 && strcmp (p->sec->output_section->name,
2724 ".tls_vars") == 0)
2725 {
2726 /* Relocations in vxworks .tls_vars sections are
2727 handled specially by the loader. */
2728 }
2729 else if (p->count != 0)
2730 {
2731 srel = elf_section_data (p->sec)->sreloc;
2732 srel->size += p->count * sizeof (Elf32_External_Rel);
2733 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2734 && (info->flags & DF_TEXTREL) == 0)
2735 {
2736 info->flags |= DF_TEXTREL;
2737 if (info->warn_shared_textrel && info->shared)
2738 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2739 p->sec->owner, p->sec);
2740 }
2741 }
2742 }
2743 }
2744
2745 local_got = elf_local_got_refcounts (ibfd);
2746 if (!local_got)
2747 continue;
2748
2749 symtab_hdr = &elf_symtab_hdr (ibfd);
2750 locsymcount = symtab_hdr->sh_info;
2751 end_local_got = local_got + locsymcount;
2752 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2753 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2754 s = htab->elf.sgot;
2755 srel = htab->elf.srelgot;
2756 for (; local_got < end_local_got;
2757 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2758 {
2759 *local_tlsdesc_gotent = (bfd_vma) -1;
2760 if (*local_got > 0)
2761 {
2762 if (GOT_TLS_GDESC_P (*local_tls_type))
2763 {
2764 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2765 - elf_i386_compute_jump_table_size (htab);
2766 htab->elf.sgotplt->size += 8;
2767 *local_got = (bfd_vma) -2;
2768 }
2769 if (! GOT_TLS_GDESC_P (*local_tls_type)
2770 || GOT_TLS_GD_P (*local_tls_type))
2771 {
2772 *local_got = s->size;
2773 s->size += 4;
2774 if (GOT_TLS_GD_P (*local_tls_type)
2775 || *local_tls_type == GOT_TLS_IE_BOTH)
2776 s->size += 4;
2777 }
2778 if (info->shared
2779 || GOT_TLS_GD_ANY_P (*local_tls_type)
2780 || (*local_tls_type & GOT_TLS_IE))
2781 {
2782 if (*local_tls_type == GOT_TLS_IE_BOTH)
2783 srel->size += 2 * sizeof (Elf32_External_Rel);
2784 else if (GOT_TLS_GD_P (*local_tls_type)
2785 || ! GOT_TLS_GDESC_P (*local_tls_type))
2786 srel->size += sizeof (Elf32_External_Rel);
2787 if (GOT_TLS_GDESC_P (*local_tls_type))
2788 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2789 }
2790 }
2791 else
2792 *local_got = (bfd_vma) -1;
2793 }
2794 }
2795
2796 if (htab->tls_ldm_got.refcount > 0)
2797 {
2798 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2799 relocs. */
2800 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2801 htab->elf.sgot->size += 8;
2802 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2803 }
2804 else
2805 htab->tls_ldm_got.offset = -1;
2806
2807 /* Allocate global sym .plt and .got entries, and space for global
2808 sym dynamic relocs. */
2809 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2810
2811 /* Allocate .plt and .got entries, and space for local symbols. */
2812 htab_traverse (htab->loc_hash_table,
2813 elf_i386_allocate_local_dynrelocs,
2814 info);
2815
2816 /* For every jump slot reserved in the sgotplt, reloc_count is
2817 incremented. However, when we reserve space for TLS descriptors,
2818 it's not incremented, so in order to compute the space reserved
2819 for them, it suffices to multiply the reloc count by the jump
2820 slot size.
2821
2822 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2823 so that R_386_IRELATIVE entries come last. */
2824 if (htab->elf.srelplt)
2825 {
2826 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2827 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2828 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2829 }
2830 else if (htab->elf.irelplt)
2831 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2832
2833
2834 if (htab->elf.sgotplt)
2835 {
2836 /* Don't allocate .got.plt section if there are no GOT nor PLT
2837 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2838 if ((htab->elf.hgot == NULL
2839 || !htab->elf.hgot->ref_regular_nonweak)
2840 && (htab->elf.sgotplt->size
2841 == get_elf_backend_data (output_bfd)->got_header_size)
2842 && (htab->elf.splt == NULL
2843 || htab->elf.splt->size == 0)
2844 && (htab->elf.sgot == NULL
2845 || htab->elf.sgot->size == 0)
2846 && (htab->elf.iplt == NULL
2847 || htab->elf.iplt->size == 0)
2848 && (htab->elf.igotplt == NULL
2849 || htab->elf.igotplt->size == 0))
2850 htab->elf.sgotplt->size = 0;
2851 }
2852
2853
2854 if (htab->plt_eh_frame != NULL
2855 && htab->elf.splt != NULL
2856 && htab->elf.splt->size != 0
2857 && !bfd_is_abs_section (htab->elf.splt->output_section)
2858 && _bfd_elf_eh_frame_present (info))
2859 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2860
2861 /* We now have determined the sizes of the various dynamic sections.
2862 Allocate memory for them. */
2863 relocs = FALSE;
2864 for (s = dynobj->sections; s != NULL; s = s->next)
2865 {
2866 bfd_boolean strip_section = TRUE;
2867
2868 if ((s->flags & SEC_LINKER_CREATED) == 0)
2869 continue;
2870
2871 if (s == htab->elf.splt
2872 || s == htab->elf.sgot)
2873 {
2874 /* Strip this section if we don't need it; see the
2875 comment below. */
2876 /* We'd like to strip these sections if they aren't needed, but if
2877 we've exported dynamic symbols from them we must leave them.
2878 It's too late to tell BFD to get rid of the symbols. */
2879
2880 if (htab->elf.hplt != NULL)
2881 strip_section = FALSE;
2882 }
2883 else if (s == htab->elf.sgotplt
2884 || s == htab->elf.iplt
2885 || s == htab->elf.igotplt
2886 || s == htab->plt_eh_frame
2887 || s == htab->sdynbss)
2888 {
2889 /* Strip these too. */
2890 }
2891 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2892 {
2893 if (s->size != 0
2894 && s != htab->elf.srelplt
2895 && s != htab->srelplt2)
2896 relocs = TRUE;
2897
2898 /* We use the reloc_count field as a counter if we need
2899 to copy relocs into the output file. */
2900 s->reloc_count = 0;
2901 }
2902 else
2903 {
2904 /* It's not one of our sections, so don't allocate space. */
2905 continue;
2906 }
2907
2908 if (s->size == 0)
2909 {
2910 /* If we don't need this section, strip it from the
2911 output file. This is mostly to handle .rel.bss and
2912 .rel.plt. We must create both sections in
2913 create_dynamic_sections, because they must be created
2914 before the linker maps input sections to output
2915 sections. The linker does that before
2916 adjust_dynamic_symbol is called, and it is that
2917 function which decides whether anything needs to go
2918 into these sections. */
2919 if (strip_section)
2920 s->flags |= SEC_EXCLUDE;
2921 continue;
2922 }
2923
2924 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2925 continue;
2926
2927 /* Allocate memory for the section contents. We use bfd_zalloc
2928 here in case unused entries are not reclaimed before the
2929 section's contents are written out. This should not happen,
2930 but this way if it does, we get a R_386_NONE reloc instead
2931 of garbage. */
2932 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2933 if (s->contents == NULL)
2934 return FALSE;
2935 }
2936
2937 if (htab->plt_eh_frame != NULL
2938 && htab->plt_eh_frame->contents != NULL)
2939 {
2940 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2941 sizeof (elf_i386_eh_frame_plt));
2942 bfd_put_32 (dynobj, htab->elf.splt->size,
2943 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2944 }
2945
2946 if (htab->elf.dynamic_sections_created)
2947 {
2948 /* Add some entries to the .dynamic section. We fill in the
2949 values later, in elf_i386_finish_dynamic_sections, but we
2950 must add the entries now so that we get the correct size for
2951 the .dynamic section. The DT_DEBUG entry is filled in by the
2952 dynamic linker and used by the debugger. */
2953 #define add_dynamic_entry(TAG, VAL) \
2954 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2955
2956 if (info->executable)
2957 {
2958 if (!add_dynamic_entry (DT_DEBUG, 0))
2959 return FALSE;
2960 }
2961
2962 if (htab->elf.splt->size != 0)
2963 {
2964 if (!add_dynamic_entry (DT_PLTGOT, 0)
2965 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2966 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2967 || !add_dynamic_entry (DT_JMPREL, 0))
2968 return FALSE;
2969 }
2970
2971 if (relocs)
2972 {
2973 if (!add_dynamic_entry (DT_REL, 0)
2974 || !add_dynamic_entry (DT_RELSZ, 0)
2975 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2976 return FALSE;
2977
2978 /* If any dynamic relocs apply to a read-only section,
2979 then we need a DT_TEXTREL entry. */
2980 if ((info->flags & DF_TEXTREL) == 0)
2981 elf_link_hash_traverse (&htab->elf,
2982 elf_i386_readonly_dynrelocs, info);
2983
2984 if ((info->flags & DF_TEXTREL) != 0)
2985 {
2986 if (!add_dynamic_entry (DT_TEXTREL, 0))
2987 return FALSE;
2988 }
2989 }
2990 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2991 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2992 return FALSE;
2993 }
2994 #undef add_dynamic_entry
2995
2996 return TRUE;
2997 }
2998
2999 static bfd_boolean
elf_i386_always_size_sections(bfd * output_bfd,struct bfd_link_info * info)3000 elf_i386_always_size_sections (bfd *output_bfd,
3001 struct bfd_link_info *info)
3002 {
3003 asection *tls_sec = elf_hash_table (info)->tls_sec;
3004
3005 if (tls_sec)
3006 {
3007 struct elf_link_hash_entry *tlsbase;
3008
3009 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3010 "_TLS_MODULE_BASE_",
3011 FALSE, FALSE, FALSE);
3012
3013 if (tlsbase && tlsbase->type == STT_TLS)
3014 {
3015 struct elf_i386_link_hash_table *htab;
3016 struct bfd_link_hash_entry *bh = NULL;
3017 const struct elf_backend_data *bed
3018 = get_elf_backend_data (output_bfd);
3019
3020 htab = elf_i386_hash_table (info);
3021 if (htab == NULL)
3022 return FALSE;
3023
3024 if (!(_bfd_generic_link_add_one_symbol
3025 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3026 tls_sec, 0, NULL, FALSE,
3027 bed->collect, &bh)))
3028 return FALSE;
3029
3030 htab->tls_module_base = bh;
3031
3032 tlsbase = (struct elf_link_hash_entry *)bh;
3033 tlsbase->def_regular = 1;
3034 tlsbase->other = STV_HIDDEN;
3035 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3036 }
3037 }
3038
3039 return TRUE;
3040 }
3041
3042 /* Set the correct type for an x86 ELF section. We do this by the
3043 section name, which is a hack, but ought to work. */
3044
3045 static bfd_boolean
elf_i386_fake_sections(bfd * abfd ATTRIBUTE_UNUSED,Elf_Internal_Shdr * hdr,asection * sec)3046 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3047 Elf_Internal_Shdr *hdr,
3048 asection *sec)
3049 {
3050 const char *name;
3051
3052 name = bfd_get_section_name (abfd, sec);
3053
3054 /* This is an ugly, but unfortunately necessary hack that is
3055 needed when producing EFI binaries on x86. It tells
3056 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3057 containing ELF relocation info. We need this hack in order to
3058 be able to generate ELF binaries that can be translated into
3059 EFI applications (which are essentially COFF objects). Those
3060 files contain a COFF ".reloc" section inside an ELFNN object,
3061 which would normally cause BFD to segfault because it would
3062 attempt to interpret this section as containing relocation
3063 entries for section "oc". With this hack enabled, ".reloc"
3064 will be treated as a normal data section, which will avoid the
3065 segfault. However, you won't be able to create an ELFNN binary
3066 with a section named "oc" that needs relocations, but that's
3067 the kind of ugly side-effects you get when detecting section
3068 types based on their names... In practice, this limitation is
3069 unlikely to bite. */
3070 if (strcmp (name, ".reloc") == 0)
3071 hdr->sh_type = SHT_PROGBITS;
3072
3073 return TRUE;
3074 }
3075
3076 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3077 executables. Rather than setting it to the beginning of the TLS
3078 section, we have to set it to the end. This function may be called
3079 multiple times, it is idempotent. */
3080
3081 static void
elf_i386_set_tls_module_base(struct bfd_link_info * info)3082 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3083 {
3084 struct elf_i386_link_hash_table *htab;
3085 struct bfd_link_hash_entry *base;
3086
3087 if (!info->executable)
3088 return;
3089
3090 htab = elf_i386_hash_table (info);
3091 if (htab == NULL)
3092 return;
3093
3094 base = htab->tls_module_base;
3095 if (base == NULL)
3096 return;
3097
3098 base->u.def.value = htab->elf.tls_size;
3099 }
3100
3101 /* Return the base VMA address which should be subtracted from real addresses
3102 when resolving @dtpoff relocation.
3103 This is PT_TLS segment p_vaddr. */
3104
3105 static bfd_vma
elf_i386_dtpoff_base(struct bfd_link_info * info)3106 elf_i386_dtpoff_base (struct bfd_link_info *info)
3107 {
3108 /* If tls_sec is NULL, we should have signalled an error already. */
3109 if (elf_hash_table (info)->tls_sec == NULL)
3110 return 0;
3111 return elf_hash_table (info)->tls_sec->vma;
3112 }
3113
3114 /* Return the relocation value for @tpoff relocation
3115 if STT_TLS virtual address is ADDRESS. */
3116
3117 static bfd_vma
elf_i386_tpoff(struct bfd_link_info * info,bfd_vma address)3118 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3119 {
3120 struct elf_link_hash_table *htab = elf_hash_table (info);
3121 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3122 bfd_vma static_tls_size;
3123
3124 /* If tls_sec is NULL, we should have signalled an error already. */
3125 if (htab->tls_sec == NULL)
3126 return 0;
3127
3128 /* Consider special static TLS alignment requirements. */
3129 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3130 return static_tls_size + htab->tls_sec->vma - address;
3131 }
3132
3133 /* Relocate an i386 ELF section. */
3134
3135 static bfd_boolean
elf_i386_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)3136 elf_i386_relocate_section (bfd *output_bfd,
3137 struct bfd_link_info *info,
3138 bfd *input_bfd,
3139 asection *input_section,
3140 bfd_byte *contents,
3141 Elf_Internal_Rela *relocs,
3142 Elf_Internal_Sym *local_syms,
3143 asection **local_sections)
3144 {
3145 struct elf_i386_link_hash_table *htab;
3146 Elf_Internal_Shdr *symtab_hdr;
3147 struct elf_link_hash_entry **sym_hashes;
3148 bfd_vma *local_got_offsets;
3149 bfd_vma *local_tlsdesc_gotents;
3150 Elf_Internal_Rela *rel;
3151 Elf_Internal_Rela *relend;
3152 bfd_boolean is_vxworks_tls;
3153 unsigned plt_entry_size;
3154
3155 BFD_ASSERT (is_i386_elf (input_bfd));
3156
3157 htab = elf_i386_hash_table (info);
3158 if (htab == NULL)
3159 return FALSE;
3160 symtab_hdr = &elf_symtab_hdr (input_bfd);
3161 sym_hashes = elf_sym_hashes (input_bfd);
3162 local_got_offsets = elf_local_got_offsets (input_bfd);
3163 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3164 /* We have to handle relocations in vxworks .tls_vars sections
3165 specially, because the dynamic loader is 'weird'. */
3166 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3167 && info->shared
3168 && !strcmp (input_section->output_section->name,
3169 ".tls_vars"));
3170
3171 elf_i386_set_tls_module_base (info);
3172
3173 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3174
3175 rel = relocs;
3176 relend = relocs + input_section->reloc_count;
3177 for (; rel < relend; rel++)
3178 {
3179 unsigned int r_type;
3180 reloc_howto_type *howto;
3181 unsigned long r_symndx;
3182 struct elf_link_hash_entry *h;
3183 Elf_Internal_Sym *sym;
3184 asection *sec;
3185 bfd_vma off, offplt;
3186 bfd_vma relocation;
3187 bfd_boolean unresolved_reloc;
3188 bfd_reloc_status_type r;
3189 unsigned int indx;
3190 int tls_type;
3191 bfd_vma st_size;
3192
3193 r_type = ELF32_R_TYPE (rel->r_info);
3194 if (r_type == R_386_GNU_VTINHERIT
3195 || r_type == R_386_GNU_VTENTRY)
3196 continue;
3197
3198 if ((indx = r_type) >= R_386_standard
3199 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3200 >= R_386_ext - R_386_standard)
3201 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3202 >= R_386_irelative - R_386_ext))
3203 {
3204 (*_bfd_error_handler)
3205 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3206 input_bfd, input_section, r_type);
3207 bfd_set_error (bfd_error_bad_value);
3208 return FALSE;
3209 }
3210 howto = elf_howto_table + indx;
3211
3212 r_symndx = ELF32_R_SYM (rel->r_info);
3213 h = NULL;
3214 sym = NULL;
3215 sec = NULL;
3216 unresolved_reloc = FALSE;
3217 if (r_symndx < symtab_hdr->sh_info)
3218 {
3219 sym = local_syms + r_symndx;
3220 sec = local_sections[r_symndx];
3221 relocation = (sec->output_section->vma
3222 + sec->output_offset
3223 + sym->st_value);
3224 st_size = sym->st_size;
3225
3226 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3227 && ((sec->flags & SEC_MERGE) != 0
3228 || (info->relocatable
3229 && sec->output_offset != 0)))
3230 {
3231 bfd_vma addend;
3232 bfd_byte *where = contents + rel->r_offset;
3233
3234 switch (howto->size)
3235 {
3236 case 0:
3237 addend = bfd_get_8 (input_bfd, where);
3238 if (howto->pc_relative)
3239 {
3240 addend = (addend ^ 0x80) - 0x80;
3241 addend += 1;
3242 }
3243 break;
3244 case 1:
3245 addend = bfd_get_16 (input_bfd, where);
3246 if (howto->pc_relative)
3247 {
3248 addend = (addend ^ 0x8000) - 0x8000;
3249 addend += 2;
3250 }
3251 break;
3252 case 2:
3253 addend = bfd_get_32 (input_bfd, where);
3254 if (howto->pc_relative)
3255 {
3256 addend = (addend ^ 0x80000000) - 0x80000000;
3257 addend += 4;
3258 }
3259 break;
3260 default:
3261 abort ();
3262 }
3263
3264 if (info->relocatable)
3265 addend += sec->output_offset;
3266 else
3267 {
3268 asection *msec = sec;
3269 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3270 addend);
3271 addend -= relocation;
3272 addend += msec->output_section->vma + msec->output_offset;
3273 }
3274
3275 switch (howto->size)
3276 {
3277 case 0:
3278 /* FIXME: overflow checks. */
3279 if (howto->pc_relative)
3280 addend -= 1;
3281 bfd_put_8 (input_bfd, addend, where);
3282 break;
3283 case 1:
3284 if (howto->pc_relative)
3285 addend -= 2;
3286 bfd_put_16 (input_bfd, addend, where);
3287 break;
3288 case 2:
3289 if (howto->pc_relative)
3290 addend -= 4;
3291 bfd_put_32 (input_bfd, addend, where);
3292 break;
3293 }
3294 }
3295 else if (!info->relocatable
3296 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3297 {
3298 /* Relocate against local STT_GNU_IFUNC symbol. */
3299 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3300 FALSE);
3301 if (h == NULL)
3302 abort ();
3303
3304 /* Set STT_GNU_IFUNC symbol value. */
3305 h->root.u.def.value = sym->st_value;
3306 h->root.u.def.section = sec;
3307 }
3308 }
3309 else
3310 {
3311 bfd_boolean warned ATTRIBUTE_UNUSED;
3312
3313 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3314 r_symndx, symtab_hdr, sym_hashes,
3315 h, sec, relocation,
3316 unresolved_reloc, warned);
3317 st_size = h->size;
3318 }
3319
3320 if (sec != NULL && discarded_section (sec))
3321 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3322 rel, 1, relend, howto, 0, contents);
3323
3324 if (info->relocatable)
3325 continue;
3326
3327 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3328 it here if it is defined in a non-shared object. */
3329 if (h != NULL
3330 && h->type == STT_GNU_IFUNC
3331 && h->def_regular)
3332 {
3333 asection *plt, *gotplt, *base_got;
3334 bfd_vma plt_index;
3335 const char *name;
3336
3337 if ((input_section->flags & SEC_ALLOC) == 0
3338 || h->plt.offset == (bfd_vma) -1)
3339 abort ();
3340
3341 /* STT_GNU_IFUNC symbol must go through PLT. */
3342 if (htab->elf.splt != NULL)
3343 {
3344 plt = htab->elf.splt;
3345 gotplt = htab->elf.sgotplt;
3346 }
3347 else
3348 {
3349 plt = htab->elf.iplt;
3350 gotplt = htab->elf.igotplt;
3351 }
3352
3353 relocation = (plt->output_section->vma
3354 + plt->output_offset + h->plt.offset);
3355
3356 switch (r_type)
3357 {
3358 default:
3359 if (h->root.root.string)
3360 name = h->root.root.string;
3361 else
3362 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3363 NULL);
3364 (*_bfd_error_handler)
3365 (_("%B: relocation %s against STT_GNU_IFUNC "
3366 "symbol `%s' isn't handled by %s"), input_bfd,
3367 elf_howto_table[r_type].name,
3368 name, __FUNCTION__);
3369 bfd_set_error (bfd_error_bad_value);
3370 return FALSE;
3371
3372 case R_386_32:
3373 /* Generate dynamic relcoation only when there is a
3374 non-GOT reference in a shared object. */
3375 if (info->shared && h->non_got_ref)
3376 {
3377 Elf_Internal_Rela outrel;
3378 asection *sreloc;
3379 bfd_vma offset;
3380
3381 /* Need a dynamic relocation to get the real function
3382 adddress. */
3383 offset = _bfd_elf_section_offset (output_bfd,
3384 info,
3385 input_section,
3386 rel->r_offset);
3387 if (offset == (bfd_vma) -1
3388 || offset == (bfd_vma) -2)
3389 abort ();
3390
3391 outrel.r_offset = (input_section->output_section->vma
3392 + input_section->output_offset
3393 + offset);
3394
3395 if (h->dynindx == -1
3396 || h->forced_local
3397 || info->executable)
3398 {
3399 /* This symbol is resolved locally. */
3400 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3401 bfd_put_32 (output_bfd,
3402 (h->root.u.def.value
3403 + h->root.u.def.section->output_section->vma
3404 + h->root.u.def.section->output_offset),
3405 contents + offset);
3406 }
3407 else
3408 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3409
3410 sreloc = htab->elf.irelifunc;
3411 elf_append_rel (output_bfd, sreloc, &outrel);
3412
3413 /* If this reloc is against an external symbol, we
3414 do not want to fiddle with the addend. Otherwise,
3415 we need to include the symbol value so that it
3416 becomes an addend for the dynamic reloc. For an
3417 internal symbol, we have updated addend. */
3418 continue;
3419 }
3420 /* FALLTHROUGH */
3421 case R_386_PC32:
3422 case R_386_PLT32:
3423 goto do_relocation;
3424
3425 case R_386_GOT32:
3426 base_got = htab->elf.sgot;
3427 off = h->got.offset;
3428
3429 if (base_got == NULL)
3430 abort ();
3431
3432 if (off == (bfd_vma) -1)
3433 {
3434 /* We can't use h->got.offset here to save state, or
3435 even just remember the offset, as finish_dynamic_symbol
3436 would use that as offset into .got. */
3437
3438 if (htab->elf.splt != NULL)
3439 {
3440 plt_index = h->plt.offset / plt_entry_size - 1;
3441 off = (plt_index + 3) * 4;
3442 base_got = htab->elf.sgotplt;
3443 }
3444 else
3445 {
3446 plt_index = h->plt.offset / plt_entry_size;
3447 off = plt_index * 4;
3448 base_got = htab->elf.igotplt;
3449 }
3450
3451 if (h->dynindx == -1
3452 || h->forced_local
3453 || info->symbolic)
3454 {
3455 /* This references the local defitionion. We must
3456 initialize this entry in the global offset table.
3457 Since the offset must always be a multiple of 8,
3458 we use the least significant bit to record
3459 whether we have initialized it already.
3460
3461 When doing a dynamic link, we create a .rela.got
3462 relocation entry to initialize the value. This
3463 is done in the finish_dynamic_symbol routine. */
3464 if ((off & 1) != 0)
3465 off &= ~1;
3466 else
3467 {
3468 bfd_put_32 (output_bfd, relocation,
3469 base_got->contents + off);
3470 h->got.offset |= 1;
3471 }
3472 }
3473
3474 relocation = off;
3475
3476 /* Adjust for static executables. */
3477 if (htab->elf.splt == NULL)
3478 relocation += gotplt->output_offset;
3479 }
3480 else
3481 {
3482 relocation = (base_got->output_section->vma
3483 + base_got->output_offset + off
3484 - gotplt->output_section->vma
3485 - gotplt->output_offset);
3486 /* Adjust for static executables. */
3487 if (htab->elf.splt == NULL)
3488 relocation += gotplt->output_offset;
3489 }
3490
3491 goto do_relocation;
3492
3493 case R_386_GOTOFF:
3494 relocation -= (gotplt->output_section->vma
3495 + gotplt->output_offset);
3496 goto do_relocation;
3497 }
3498 }
3499
3500 switch (r_type)
3501 {
3502 case R_386_GOT32:
3503 /* Relocation is to the entry for this symbol in the global
3504 offset table. */
3505 if (htab->elf.sgot == NULL)
3506 abort ();
3507
3508 if (h != NULL)
3509 {
3510 bfd_boolean dyn;
3511
3512 off = h->got.offset;
3513 dyn = htab->elf.dynamic_sections_created;
3514 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3515 || (info->shared
3516 && SYMBOL_REFERENCES_LOCAL (info, h))
3517 || (ELF_ST_VISIBILITY (h->other)
3518 && h->root.type == bfd_link_hash_undefweak))
3519 {
3520 /* This is actually a static link, or it is a
3521 -Bsymbolic link and the symbol is defined
3522 locally, or the symbol was forced to be local
3523 because of a version file. We must initialize
3524 this entry in the global offset table. Since the
3525 offset must always be a multiple of 4, we use the
3526 least significant bit to record whether we have
3527 initialized it already.
3528
3529 When doing a dynamic link, we create a .rel.got
3530 relocation entry to initialize the value. This
3531 is done in the finish_dynamic_symbol routine. */
3532 if ((off & 1) != 0)
3533 off &= ~1;
3534 else
3535 {
3536 bfd_put_32 (output_bfd, relocation,
3537 htab->elf.sgot->contents + off);
3538 h->got.offset |= 1;
3539 }
3540 }
3541 else
3542 unresolved_reloc = FALSE;
3543 }
3544 else
3545 {
3546 if (local_got_offsets == NULL)
3547 abort ();
3548
3549 off = local_got_offsets[r_symndx];
3550
3551 /* The offset must always be a multiple of 4. We use
3552 the least significant bit to record whether we have
3553 already generated the necessary reloc. */
3554 if ((off & 1) != 0)
3555 off &= ~1;
3556 else
3557 {
3558 bfd_put_32 (output_bfd, relocation,
3559 htab->elf.sgot->contents + off);
3560
3561 if (info->shared)
3562 {
3563 asection *s;
3564 Elf_Internal_Rela outrel;
3565
3566 s = htab->elf.srelgot;
3567 if (s == NULL)
3568 abort ();
3569
3570 outrel.r_offset = (htab->elf.sgot->output_section->vma
3571 + htab->elf.sgot->output_offset
3572 + off);
3573 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3574 elf_append_rel (output_bfd, s, &outrel);
3575 }
3576
3577 local_got_offsets[r_symndx] |= 1;
3578 }
3579 }
3580
3581 if (off >= (bfd_vma) -2)
3582 abort ();
3583
3584 relocation = htab->elf.sgot->output_section->vma
3585 + htab->elf.sgot->output_offset + off
3586 - htab->elf.sgotplt->output_section->vma
3587 - htab->elf.sgotplt->output_offset;
3588 break;
3589
3590 case R_386_GOTOFF:
3591 /* Relocation is relative to the start of the global offset
3592 table. */
3593
3594 /* Check to make sure it isn't a protected function symbol
3595 for shared library since it may not be local when used
3596 as function address. We also need to make sure that a
3597 symbol is defined locally. */
3598 if (info->shared && h)
3599 {
3600 if (!h->def_regular)
3601 {
3602 const char *v;
3603
3604 switch (ELF_ST_VISIBILITY (h->other))
3605 {
3606 case STV_HIDDEN:
3607 v = _("hidden symbol");
3608 break;
3609 case STV_INTERNAL:
3610 v = _("internal symbol");
3611 break;
3612 case STV_PROTECTED:
3613 v = _("protected symbol");
3614 break;
3615 default:
3616 v = _("symbol");
3617 break;
3618 }
3619
3620 (*_bfd_error_handler)
3621 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3622 input_bfd, v, h->root.root.string);
3623 bfd_set_error (bfd_error_bad_value);
3624 return FALSE;
3625 }
3626 else if (!info->executable
3627 && !SYMBOLIC_BIND (info, h)
3628 && h->type == STT_FUNC
3629 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3630 {
3631 (*_bfd_error_handler)
3632 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3633 input_bfd, h->root.root.string);
3634 bfd_set_error (bfd_error_bad_value);
3635 return FALSE;
3636 }
3637 }
3638
3639 /* Note that sgot is not involved in this
3640 calculation. We always want the start of .got.plt. If we
3641 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3642 permitted by the ABI, we might have to change this
3643 calculation. */
3644 relocation -= htab->elf.sgotplt->output_section->vma
3645 + htab->elf.sgotplt->output_offset;
3646 break;
3647
3648 case R_386_GOTPC:
3649 /* Use global offset table as symbol value. */
3650 relocation = htab->elf.sgotplt->output_section->vma
3651 + htab->elf.sgotplt->output_offset;
3652 unresolved_reloc = FALSE;
3653 break;
3654
3655 case R_386_PLT32:
3656 /* Relocation is to the entry for this symbol in the
3657 procedure linkage table. */
3658
3659 /* Resolve a PLT32 reloc against a local symbol directly,
3660 without using the procedure linkage table. */
3661 if (h == NULL)
3662 break;
3663
3664 if (h->plt.offset == (bfd_vma) -1
3665 || htab->elf.splt == NULL)
3666 {
3667 /* We didn't make a PLT entry for this symbol. This
3668 happens when statically linking PIC code, or when
3669 using -Bsymbolic. */
3670 break;
3671 }
3672
3673 relocation = (htab->elf.splt->output_section->vma
3674 + htab->elf.splt->output_offset
3675 + h->plt.offset);
3676 unresolved_reloc = FALSE;
3677 break;
3678
3679 case R_386_SIZE32:
3680 /* Set to symbol size. */
3681 relocation = st_size;
3682 /* Fall through. */
3683
3684 case R_386_32:
3685 case R_386_PC32:
3686 if ((input_section->flags & SEC_ALLOC) == 0
3687 || is_vxworks_tls)
3688 break;
3689
3690 if ((info->shared
3691 && (h == NULL
3692 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3693 || h->root.type != bfd_link_hash_undefweak)
3694 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3695 || !SYMBOL_CALLS_LOCAL (info, h)))
3696 || (ELIMINATE_COPY_RELOCS
3697 && !info->shared
3698 && h != NULL
3699 && h->dynindx != -1
3700 && !h->non_got_ref
3701 && ((h->def_dynamic
3702 && !h->def_regular)
3703 || h->root.type == bfd_link_hash_undefweak
3704 || h->root.type == bfd_link_hash_undefined)))
3705 {
3706 Elf_Internal_Rela outrel;
3707 bfd_boolean skip, relocate;
3708 asection *sreloc;
3709
3710 /* When generating a shared object, these relocations
3711 are copied into the output file to be resolved at run
3712 time. */
3713
3714 skip = FALSE;
3715 relocate = FALSE;
3716
3717 outrel.r_offset =
3718 _bfd_elf_section_offset (output_bfd, info, input_section,
3719 rel->r_offset);
3720 if (outrel.r_offset == (bfd_vma) -1)
3721 skip = TRUE;
3722 else if (outrel.r_offset == (bfd_vma) -2)
3723 skip = TRUE, relocate = TRUE;
3724 outrel.r_offset += (input_section->output_section->vma
3725 + input_section->output_offset);
3726
3727 if (skip)
3728 memset (&outrel, 0, sizeof outrel);
3729 else if (h != NULL
3730 && h->dynindx != -1
3731 && (r_type == R_386_PC32
3732 || !info->shared
3733 || !SYMBOLIC_BIND (info, h)
3734 || !h->def_regular))
3735 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3736 else
3737 {
3738 /* This symbol is local, or marked to become local. */
3739 relocate = TRUE;
3740 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3741 }
3742
3743 sreloc = elf_section_data (input_section)->sreloc;
3744
3745 if (sreloc == NULL || sreloc->contents == NULL)
3746 {
3747 r = bfd_reloc_notsupported;
3748 goto check_relocation_error;
3749 }
3750
3751 elf_append_rel (output_bfd, sreloc, &outrel);
3752
3753 /* If this reloc is against an external symbol, we do
3754 not want to fiddle with the addend. Otherwise, we
3755 need to include the symbol value so that it becomes
3756 an addend for the dynamic reloc. */
3757 if (! relocate)
3758 continue;
3759 }
3760 break;
3761
3762 case R_386_TLS_IE:
3763 if (!info->executable)
3764 {
3765 Elf_Internal_Rela outrel;
3766 asection *sreloc;
3767
3768 outrel.r_offset = rel->r_offset
3769 + input_section->output_section->vma
3770 + input_section->output_offset;
3771 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3772 sreloc = elf_section_data (input_section)->sreloc;
3773 if (sreloc == NULL)
3774 abort ();
3775 elf_append_rel (output_bfd, sreloc, &outrel);
3776 }
3777 /* Fall through */
3778
3779 case R_386_TLS_GD:
3780 case R_386_TLS_GOTDESC:
3781 case R_386_TLS_DESC_CALL:
3782 case R_386_TLS_IE_32:
3783 case R_386_TLS_GOTIE:
3784 tls_type = GOT_UNKNOWN;
3785 if (h == NULL && local_got_offsets)
3786 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3787 else if (h != NULL)
3788 tls_type = elf_i386_hash_entry(h)->tls_type;
3789 if (tls_type == GOT_TLS_IE)
3790 tls_type = GOT_TLS_IE_NEG;
3791
3792 if (! elf_i386_tls_transition (info, input_bfd,
3793 input_section, contents,
3794 symtab_hdr, sym_hashes,
3795 &r_type, tls_type, rel,
3796 relend, h, r_symndx))
3797 return FALSE;
3798
3799 if (r_type == R_386_TLS_LE_32)
3800 {
3801 BFD_ASSERT (! unresolved_reloc);
3802 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3803 {
3804 unsigned int type;
3805 bfd_vma roff;
3806
3807 /* GD->LE transition. */
3808 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3809 if (type == 0x04)
3810 {
3811 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3812 Change it into:
3813 movl %gs:0, %eax; subl $foo@tpoff, %eax
3814 (6 byte form of subl). */
3815 memcpy (contents + rel->r_offset - 3,
3816 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3817 roff = rel->r_offset + 5;
3818 }
3819 else
3820 {
3821 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3822 Change it into:
3823 movl %gs:0, %eax; subl $foo@tpoff, %eax
3824 (6 byte form of subl). */
3825 memcpy (contents + rel->r_offset - 2,
3826 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3827 roff = rel->r_offset + 6;
3828 }
3829 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3830 contents + roff);
3831 /* Skip R_386_PC32/R_386_PLT32. */
3832 rel++;
3833 continue;
3834 }
3835 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3836 {
3837 /* GDesc -> LE transition.
3838 It's originally something like:
3839 leal x@tlsdesc(%ebx), %eax
3840
3841 leal x@ntpoff, %eax
3842
3843 Registers other than %eax may be set up here. */
3844
3845 unsigned int val;
3846 bfd_vma roff;
3847
3848 roff = rel->r_offset;
3849 val = bfd_get_8 (input_bfd, contents + roff - 1);
3850
3851 /* Now modify the instruction as appropriate. */
3852 /* aoliva FIXME: remove the above and xor the byte
3853 below with 0x86. */
3854 bfd_put_8 (output_bfd, val ^ 0x86,
3855 contents + roff - 1);
3856 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3857 contents + roff);
3858 continue;
3859 }
3860 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3861 {
3862 /* GDesc -> LE transition.
3863 It's originally:
3864 call *(%eax)
3865 Turn it into:
3866 xchg %ax,%ax */
3867
3868 bfd_vma roff;
3869
3870 roff = rel->r_offset;
3871 bfd_put_8 (output_bfd, 0x66, contents + roff);
3872 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3873 continue;
3874 }
3875 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3876 {
3877 unsigned int val;
3878
3879 /* IE->LE transition:
3880 Originally it can be one of:
3881 movl foo, %eax
3882 movl foo, %reg
3883 addl foo, %reg
3884 We change it into:
3885 movl $foo, %eax
3886 movl $foo, %reg
3887 addl $foo, %reg. */
3888 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3889 if (val == 0xa1)
3890 {
3891 /* movl foo, %eax. */
3892 bfd_put_8 (output_bfd, 0xb8,
3893 contents + rel->r_offset - 1);
3894 }
3895 else
3896 {
3897 unsigned int type;
3898
3899 type = bfd_get_8 (input_bfd,
3900 contents + rel->r_offset - 2);
3901 switch (type)
3902 {
3903 case 0x8b:
3904 /* movl */
3905 bfd_put_8 (output_bfd, 0xc7,
3906 contents + rel->r_offset - 2);
3907 bfd_put_8 (output_bfd,
3908 0xc0 | ((val >> 3) & 7),
3909 contents + rel->r_offset - 1);
3910 break;
3911 case 0x03:
3912 /* addl */
3913 bfd_put_8 (output_bfd, 0x81,
3914 contents + rel->r_offset - 2);
3915 bfd_put_8 (output_bfd,
3916 0xc0 | ((val >> 3) & 7),
3917 contents + rel->r_offset - 1);
3918 break;
3919 default:
3920 BFD_FAIL ();
3921 break;
3922 }
3923 }
3924 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3925 contents + rel->r_offset);
3926 continue;
3927 }
3928 else
3929 {
3930 unsigned int val, type;
3931
3932 /* {IE_32,GOTIE}->LE transition:
3933 Originally it can be one of:
3934 subl foo(%reg1), %reg2
3935 movl foo(%reg1), %reg2
3936 addl foo(%reg1), %reg2
3937 We change it into:
3938 subl $foo, %reg2
3939 movl $foo, %reg2 (6 byte form)
3940 addl $foo, %reg2. */
3941 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3942 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3943 if (type == 0x8b)
3944 {
3945 /* movl */
3946 bfd_put_8 (output_bfd, 0xc7,
3947 contents + rel->r_offset - 2);
3948 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3949 contents + rel->r_offset - 1);
3950 }
3951 else if (type == 0x2b)
3952 {
3953 /* subl */
3954 bfd_put_8 (output_bfd, 0x81,
3955 contents + rel->r_offset - 2);
3956 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3957 contents + rel->r_offset - 1);
3958 }
3959 else if (type == 0x03)
3960 {
3961 /* addl */
3962 bfd_put_8 (output_bfd, 0x81,
3963 contents + rel->r_offset - 2);
3964 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3965 contents + rel->r_offset - 1);
3966 }
3967 else
3968 BFD_FAIL ();
3969 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3970 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3971 contents + rel->r_offset);
3972 else
3973 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3974 contents + rel->r_offset);
3975 continue;
3976 }
3977 }
3978
3979 if (htab->elf.sgot == NULL)
3980 abort ();
3981
3982 if (h != NULL)
3983 {
3984 off = h->got.offset;
3985 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3986 }
3987 else
3988 {
3989 if (local_got_offsets == NULL)
3990 abort ();
3991
3992 off = local_got_offsets[r_symndx];
3993 offplt = local_tlsdesc_gotents[r_symndx];
3994 }
3995
3996 if ((off & 1) != 0)
3997 off &= ~1;
3998 else
3999 {
4000 Elf_Internal_Rela outrel;
4001 int dr_type;
4002 asection *sreloc;
4003
4004 if (htab->elf.srelgot == NULL)
4005 abort ();
4006
4007 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4008
4009 if (GOT_TLS_GDESC_P (tls_type))
4010 {
4011 bfd_byte *loc;
4012 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4013 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4014 <= htab->elf.sgotplt->size);
4015 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4016 + htab->elf.sgotplt->output_offset
4017 + offplt
4018 + htab->sgotplt_jump_table_size);
4019 sreloc = htab->elf.srelplt;
4020 loc = sreloc->contents;
4021 loc += (htab->next_tls_desc_index++
4022 * sizeof (Elf32_External_Rel));
4023 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4024 <= sreloc->contents + sreloc->size);
4025 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4026 if (indx == 0)
4027 {
4028 BFD_ASSERT (! unresolved_reloc);
4029 bfd_put_32 (output_bfd,
4030 relocation - elf_i386_dtpoff_base (info),
4031 htab->elf.sgotplt->contents + offplt
4032 + htab->sgotplt_jump_table_size + 4);
4033 }
4034 else
4035 {
4036 bfd_put_32 (output_bfd, 0,
4037 htab->elf.sgotplt->contents + offplt
4038 + htab->sgotplt_jump_table_size + 4);
4039 }
4040 }
4041
4042 sreloc = htab->elf.srelgot;
4043
4044 outrel.r_offset = (htab->elf.sgot->output_section->vma
4045 + htab->elf.sgot->output_offset + off);
4046
4047 if (GOT_TLS_GD_P (tls_type))
4048 dr_type = R_386_TLS_DTPMOD32;
4049 else if (GOT_TLS_GDESC_P (tls_type))
4050 goto dr_done;
4051 else if (tls_type == GOT_TLS_IE_POS)
4052 dr_type = R_386_TLS_TPOFF;
4053 else
4054 dr_type = R_386_TLS_TPOFF32;
4055
4056 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4057 bfd_put_32 (output_bfd,
4058 relocation - elf_i386_dtpoff_base (info),
4059 htab->elf.sgot->contents + off);
4060 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4061 bfd_put_32 (output_bfd,
4062 elf_i386_dtpoff_base (info) - relocation,
4063 htab->elf.sgot->contents + off);
4064 else if (dr_type != R_386_TLS_DESC)
4065 bfd_put_32 (output_bfd, 0,
4066 htab->elf.sgot->contents + off);
4067 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4068
4069 elf_append_rel (output_bfd, sreloc, &outrel);
4070
4071 if (GOT_TLS_GD_P (tls_type))
4072 {
4073 if (indx == 0)
4074 {
4075 BFD_ASSERT (! unresolved_reloc);
4076 bfd_put_32 (output_bfd,
4077 relocation - elf_i386_dtpoff_base (info),
4078 htab->elf.sgot->contents + off + 4);
4079 }
4080 else
4081 {
4082 bfd_put_32 (output_bfd, 0,
4083 htab->elf.sgot->contents + off + 4);
4084 outrel.r_info = ELF32_R_INFO (indx,
4085 R_386_TLS_DTPOFF32);
4086 outrel.r_offset += 4;
4087 elf_append_rel (output_bfd, sreloc, &outrel);
4088 }
4089 }
4090 else if (tls_type == GOT_TLS_IE_BOTH)
4091 {
4092 bfd_put_32 (output_bfd,
4093 (indx == 0
4094 ? relocation - elf_i386_dtpoff_base (info)
4095 : 0),
4096 htab->elf.sgot->contents + off + 4);
4097 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4098 outrel.r_offset += 4;
4099 elf_append_rel (output_bfd, sreloc, &outrel);
4100 }
4101
4102 dr_done:
4103 if (h != NULL)
4104 h->got.offset |= 1;
4105 else
4106 local_got_offsets[r_symndx] |= 1;
4107 }
4108
4109 if (off >= (bfd_vma) -2
4110 && ! GOT_TLS_GDESC_P (tls_type))
4111 abort ();
4112 if (r_type == R_386_TLS_GOTDESC
4113 || r_type == R_386_TLS_DESC_CALL)
4114 {
4115 relocation = htab->sgotplt_jump_table_size + offplt;
4116 unresolved_reloc = FALSE;
4117 }
4118 else if (r_type == ELF32_R_TYPE (rel->r_info))
4119 {
4120 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4121 + htab->elf.sgotplt->output_offset;
4122 relocation = htab->elf.sgot->output_section->vma
4123 + htab->elf.sgot->output_offset + off - g_o_t;
4124 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4125 && tls_type == GOT_TLS_IE_BOTH)
4126 relocation += 4;
4127 if (r_type == R_386_TLS_IE)
4128 relocation += g_o_t;
4129 unresolved_reloc = FALSE;
4130 }
4131 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4132 {
4133 unsigned int val, type;
4134 bfd_vma roff;
4135
4136 /* GD->IE transition. */
4137 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4138 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4139 if (type == 0x04)
4140 {
4141 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4142 Change it into:
4143 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4144 val >>= 3;
4145 roff = rel->r_offset - 3;
4146 }
4147 else
4148 {
4149 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4150 Change it into:
4151 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4152 roff = rel->r_offset - 2;
4153 }
4154 memcpy (contents + roff,
4155 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4156 contents[roff + 7] = 0x80 | (val & 7);
4157 /* If foo is used only with foo@gotntpoff(%reg) and
4158 foo@indntpoff, but not with foo@gottpoff(%reg), change
4159 subl $foo@gottpoff(%reg), %eax
4160 into:
4161 addl $foo@gotntpoff(%reg), %eax. */
4162 if (tls_type == GOT_TLS_IE_POS)
4163 contents[roff + 6] = 0x03;
4164 bfd_put_32 (output_bfd,
4165 htab->elf.sgot->output_section->vma
4166 + htab->elf.sgot->output_offset + off
4167 - htab->elf.sgotplt->output_section->vma
4168 - htab->elf.sgotplt->output_offset,
4169 contents + roff + 8);
4170 /* Skip R_386_PLT32. */
4171 rel++;
4172 continue;
4173 }
4174 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4175 {
4176 /* GDesc -> IE transition.
4177 It's originally something like:
4178 leal x@tlsdesc(%ebx), %eax
4179
4180 Change it to:
4181 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4182 or:
4183 movl x@gottpoff(%ebx), %eax # before negl %eax
4184
4185 Registers other than %eax may be set up here. */
4186
4187 bfd_vma roff;
4188
4189 /* First, make sure it's a leal adding ebx to a 32-bit
4190 offset into any register, although it's probably
4191 almost always going to be eax. */
4192 roff = rel->r_offset;
4193
4194 /* Now modify the instruction as appropriate. */
4195 /* To turn a leal into a movl in the form we use it, it
4196 suffices to change the first byte from 0x8d to 0x8b.
4197 aoliva FIXME: should we decide to keep the leal, all
4198 we have to do is remove the statement below, and
4199 adjust the relaxation of R_386_TLS_DESC_CALL. */
4200 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4201
4202 if (tls_type == GOT_TLS_IE_BOTH)
4203 off += 4;
4204
4205 bfd_put_32 (output_bfd,
4206 htab->elf.sgot->output_section->vma
4207 + htab->elf.sgot->output_offset + off
4208 - htab->elf.sgotplt->output_section->vma
4209 - htab->elf.sgotplt->output_offset,
4210 contents + roff);
4211 continue;
4212 }
4213 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4214 {
4215 /* GDesc -> IE transition.
4216 It's originally:
4217 call *(%eax)
4218
4219 Change it to:
4220 xchg %ax,%ax
4221 or
4222 negl %eax
4223 depending on how we transformed the TLS_GOTDESC above.
4224 */
4225
4226 bfd_vma roff;
4227
4228 roff = rel->r_offset;
4229
4230 /* Now modify the instruction as appropriate. */
4231 if (tls_type != GOT_TLS_IE_NEG)
4232 {
4233 /* xchg %ax,%ax */
4234 bfd_put_8 (output_bfd, 0x66, contents + roff);
4235 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4236 }
4237 else
4238 {
4239 /* negl %eax */
4240 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4241 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4242 }
4243
4244 continue;
4245 }
4246 else
4247 BFD_ASSERT (FALSE);
4248 break;
4249
4250 case R_386_TLS_LDM:
4251 if (! elf_i386_tls_transition (info, input_bfd,
4252 input_section, contents,
4253 symtab_hdr, sym_hashes,
4254 &r_type, GOT_UNKNOWN, rel,
4255 relend, h, r_symndx))
4256 return FALSE;
4257
4258 if (r_type != R_386_TLS_LDM)
4259 {
4260 /* LD->LE transition:
4261 leal foo(%reg), %eax; call ___tls_get_addr.
4262 We change it into:
4263 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4264 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4265 memcpy (contents + rel->r_offset - 2,
4266 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4267 /* Skip R_386_PC32/R_386_PLT32. */
4268 rel++;
4269 continue;
4270 }
4271
4272 if (htab->elf.sgot == NULL)
4273 abort ();
4274
4275 off = htab->tls_ldm_got.offset;
4276 if (off & 1)
4277 off &= ~1;
4278 else
4279 {
4280 Elf_Internal_Rela outrel;
4281
4282 if (htab->elf.srelgot == NULL)
4283 abort ();
4284
4285 outrel.r_offset = (htab->elf.sgot->output_section->vma
4286 + htab->elf.sgot->output_offset + off);
4287
4288 bfd_put_32 (output_bfd, 0,
4289 htab->elf.sgot->contents + off);
4290 bfd_put_32 (output_bfd, 0,
4291 htab->elf.sgot->contents + off + 4);
4292 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4293 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4294 htab->tls_ldm_got.offset |= 1;
4295 }
4296 relocation = htab->elf.sgot->output_section->vma
4297 + htab->elf.sgot->output_offset + off
4298 - htab->elf.sgotplt->output_section->vma
4299 - htab->elf.sgotplt->output_offset;
4300 unresolved_reloc = FALSE;
4301 break;
4302
4303 case R_386_TLS_LDO_32:
4304 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4305 relocation -= elf_i386_dtpoff_base (info);
4306 else
4307 /* When converting LDO to LE, we must negate. */
4308 relocation = -elf_i386_tpoff (info, relocation);
4309 break;
4310
4311 case R_386_TLS_LE_32:
4312 case R_386_TLS_LE:
4313 if (!info->executable)
4314 {
4315 Elf_Internal_Rela outrel;
4316 asection *sreloc;
4317
4318 outrel.r_offset = rel->r_offset
4319 + input_section->output_section->vma
4320 + input_section->output_offset;
4321 if (h != NULL && h->dynindx != -1)
4322 indx = h->dynindx;
4323 else
4324 indx = 0;
4325 if (r_type == R_386_TLS_LE_32)
4326 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4327 else
4328 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4329 sreloc = elf_section_data (input_section)->sreloc;
4330 if (sreloc == NULL)
4331 abort ();
4332 elf_append_rel (output_bfd, sreloc, &outrel);
4333 if (indx)
4334 continue;
4335 else if (r_type == R_386_TLS_LE_32)
4336 relocation = elf_i386_dtpoff_base (info) - relocation;
4337 else
4338 relocation -= elf_i386_dtpoff_base (info);
4339 }
4340 else if (r_type == R_386_TLS_LE_32)
4341 relocation = elf_i386_tpoff (info, relocation);
4342 else
4343 relocation = -elf_i386_tpoff (info, relocation);
4344 break;
4345
4346 default:
4347 break;
4348 }
4349
4350 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4351 because such sections are not SEC_ALLOC and thus ld.so will
4352 not process them. */
4353 if (unresolved_reloc
4354 && !((input_section->flags & SEC_DEBUGGING) != 0
4355 && h->def_dynamic)
4356 && _bfd_elf_section_offset (output_bfd, info, input_section,
4357 rel->r_offset) != (bfd_vma) -1)
4358 {
4359 (*_bfd_error_handler)
4360 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4361 input_bfd,
4362 input_section,
4363 (long) rel->r_offset,
4364 howto->name,
4365 h->root.root.string);
4366 return FALSE;
4367 }
4368
4369 do_relocation:
4370 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4371 contents, rel->r_offset,
4372 relocation, 0);
4373
4374 check_relocation_error:
4375 if (r != bfd_reloc_ok)
4376 {
4377 const char *name;
4378
4379 if (h != NULL)
4380 name = h->root.root.string;
4381 else
4382 {
4383 name = bfd_elf_string_from_elf_section (input_bfd,
4384 symtab_hdr->sh_link,
4385 sym->st_name);
4386 if (name == NULL)
4387 return FALSE;
4388 if (*name == '\0')
4389 name = bfd_section_name (input_bfd, sec);
4390 }
4391
4392 if (r == bfd_reloc_overflow)
4393 {
4394 if (! ((*info->callbacks->reloc_overflow)
4395 (info, (h ? &h->root : NULL), name, howto->name,
4396 (bfd_vma) 0, input_bfd, input_section,
4397 rel->r_offset)))
4398 return FALSE;
4399 }
4400 else
4401 {
4402 (*_bfd_error_handler)
4403 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4404 input_bfd, input_section,
4405 (long) rel->r_offset, name, (int) r);
4406 return FALSE;
4407 }
4408 }
4409 }
4410
4411 return TRUE;
4412 }
4413
4414 /* Finish up dynamic symbol handling. We set the contents of various
4415 dynamic sections here. */
4416
4417 static bfd_boolean
elf_i386_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)4418 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4419 struct bfd_link_info *info,
4420 struct elf_link_hash_entry *h,
4421 Elf_Internal_Sym *sym)
4422 {
4423 struct elf_i386_link_hash_table *htab;
4424 unsigned plt_entry_size;
4425 const struct elf_i386_backend_data *abed;
4426
4427 htab = elf_i386_hash_table (info);
4428 if (htab == NULL)
4429 return FALSE;
4430
4431 abed = get_elf_i386_backend_data (output_bfd);
4432 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4433
4434 if (h->plt.offset != (bfd_vma) -1)
4435 {
4436 bfd_vma plt_index;
4437 bfd_vma got_offset;
4438 Elf_Internal_Rela rel;
4439 bfd_byte *loc;
4440 asection *plt, *gotplt, *relplt;
4441
4442 /* When building a static executable, use .iplt, .igot.plt and
4443 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4444 if (htab->elf.splt != NULL)
4445 {
4446 plt = htab->elf.splt;
4447 gotplt = htab->elf.sgotplt;
4448 relplt = htab->elf.srelplt;
4449 }
4450 else
4451 {
4452 plt = htab->elf.iplt;
4453 gotplt = htab->elf.igotplt;
4454 relplt = htab->elf.irelplt;
4455 }
4456
4457 /* This symbol has an entry in the procedure linkage table. Set
4458 it up. */
4459
4460 if ((h->dynindx == -1
4461 && !((h->forced_local || info->executable)
4462 && h->def_regular
4463 && h->type == STT_GNU_IFUNC))
4464 || plt == NULL
4465 || gotplt == NULL
4466 || relplt == NULL)
4467 abort ();
4468
4469 /* Get the index in the procedure linkage table which
4470 corresponds to this symbol. This is the index of this symbol
4471 in all the symbols for which we are making plt entries. The
4472 first entry in the procedure linkage table is reserved.
4473
4474 Get the offset into the .got table of the entry that
4475 corresponds to this function. Each .got entry is 4 bytes.
4476 The first three are reserved.
4477
4478 For static executables, we don't reserve anything. */
4479
4480 if (plt == htab->elf.splt)
4481 {
4482 got_offset = h->plt.offset / plt_entry_size - 1;
4483 got_offset = (got_offset + 3) * 4;
4484 }
4485 else
4486 {
4487 got_offset = h->plt.offset / plt_entry_size;
4488 got_offset = got_offset * 4;
4489 }
4490
4491 /* Fill in the entry in the procedure linkage table. */
4492 if (! info->shared)
4493 {
4494 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4495 abed->plt->plt_entry_size);
4496 bfd_put_32 (output_bfd,
4497 (gotplt->output_section->vma
4498 + gotplt->output_offset
4499 + got_offset),
4500 plt->contents + h->plt.offset
4501 + abed->plt->plt_got_offset);
4502
4503 if (abed->is_vxworks)
4504 {
4505 int s, k, reloc_index;
4506
4507 /* Create the R_386_32 relocation referencing the GOT
4508 for this PLT entry. */
4509
4510 /* S: Current slot number (zero-based). */
4511 s = ((h->plt.offset - abed->plt->plt_entry_size)
4512 / abed->plt->plt_entry_size);
4513 /* K: Number of relocations for PLTResolve. */
4514 if (info->shared)
4515 k = PLTRESOLVE_RELOCS_SHLIB;
4516 else
4517 k = PLTRESOLVE_RELOCS;
4518 /* Skip the PLTresolve relocations, and the relocations for
4519 the other PLT slots. */
4520 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4521 loc = (htab->srelplt2->contents + reloc_index
4522 * sizeof (Elf32_External_Rel));
4523
4524 rel.r_offset = (htab->elf.splt->output_section->vma
4525 + htab->elf.splt->output_offset
4526 + h->plt.offset + 2),
4527 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4528 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4529
4530 /* Create the R_386_32 relocation referencing the beginning of
4531 the PLT for this GOT entry. */
4532 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4533 + htab->elf.sgotplt->output_offset
4534 + got_offset);
4535 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4536 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4537 loc + sizeof (Elf32_External_Rel));
4538 }
4539 }
4540 else
4541 {
4542 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4543 abed->plt->plt_entry_size);
4544 bfd_put_32 (output_bfd, got_offset,
4545 plt->contents + h->plt.offset
4546 + abed->plt->plt_got_offset);
4547 }
4548
4549 /* Fill in the entry in the global offset table. */
4550 bfd_put_32 (output_bfd,
4551 (plt->output_section->vma
4552 + plt->output_offset
4553 + h->plt.offset
4554 + abed->plt->plt_lazy_offset),
4555 gotplt->contents + got_offset);
4556
4557 /* Fill in the entry in the .rel.plt section. */
4558 rel.r_offset = (gotplt->output_section->vma
4559 + gotplt->output_offset
4560 + got_offset);
4561 if (h->dynindx == -1
4562 || ((info->executable
4563 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4564 && h->def_regular
4565 && h->type == STT_GNU_IFUNC))
4566 {
4567 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4568 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4569 in the .got.plt section. */
4570 bfd_put_32 (output_bfd,
4571 (h->root.u.def.value
4572 + h->root.u.def.section->output_section->vma
4573 + h->root.u.def.section->output_offset),
4574 gotplt->contents + got_offset);
4575 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4576 /* R_386_IRELATIVE comes last. */
4577 plt_index = htab->next_irelative_index--;
4578 }
4579 else
4580 {
4581 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4582 plt_index = htab->next_jump_slot_index++;
4583 }
4584 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4585 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4586
4587 /* Don't fill PLT entry for static executables. */
4588 if (plt == htab->elf.splt)
4589 {
4590 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4591 plt->contents + h->plt.offset
4592 + abed->plt->plt_reloc_offset);
4593 bfd_put_32 (output_bfd, - (h->plt.offset
4594 + abed->plt->plt_plt_offset + 4),
4595 plt->contents + h->plt.offset
4596 + abed->plt->plt_plt_offset);
4597 }
4598
4599 if (!h->def_regular)
4600 {
4601 /* Mark the symbol as undefined, rather than as defined in
4602 the .plt section. Leave the value if there were any
4603 relocations where pointer equality matters (this is a clue
4604 for the dynamic linker, to make function pointer
4605 comparisons work between an application and shared
4606 library), otherwise set it to zero. If a function is only
4607 called from a binary, there is no need to slow down
4608 shared libraries because of that. */
4609 sym->st_shndx = SHN_UNDEF;
4610 if (!h->pointer_equality_needed)
4611 sym->st_value = 0;
4612 }
4613 }
4614
4615 if (h->got.offset != (bfd_vma) -1
4616 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4617 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4618 {
4619 Elf_Internal_Rela rel;
4620
4621 /* This symbol has an entry in the global offset table. Set it
4622 up. */
4623
4624 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4625 abort ();
4626
4627 rel.r_offset = (htab->elf.sgot->output_section->vma
4628 + htab->elf.sgot->output_offset
4629 + (h->got.offset & ~(bfd_vma) 1));
4630
4631 /* If this is a static link, or it is a -Bsymbolic link and the
4632 symbol is defined locally or was forced to be local because
4633 of a version file, we just want to emit a RELATIVE reloc.
4634 The entry in the global offset table will already have been
4635 initialized in the relocate_section function. */
4636 if (h->def_regular
4637 && h->type == STT_GNU_IFUNC)
4638 {
4639 if (info->shared)
4640 {
4641 /* Generate R_386_GLOB_DAT. */
4642 goto do_glob_dat;
4643 }
4644 else
4645 {
4646 asection *plt;
4647
4648 if (!h->pointer_equality_needed)
4649 abort ();
4650
4651 /* For non-shared object, we can't use .got.plt, which
4652 contains the real function addres if we need pointer
4653 equality. We load the GOT entry with the PLT entry. */
4654 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4655 bfd_put_32 (output_bfd,
4656 (plt->output_section->vma
4657 + plt->output_offset + h->plt.offset),
4658 htab->elf.sgot->contents + h->got.offset);
4659 return TRUE;
4660 }
4661 }
4662 else if (info->shared
4663 && SYMBOL_REFERENCES_LOCAL (info, h))
4664 {
4665 BFD_ASSERT((h->got.offset & 1) != 0);
4666 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4667 }
4668 else
4669 {
4670 BFD_ASSERT((h->got.offset & 1) == 0);
4671 do_glob_dat:
4672 bfd_put_32 (output_bfd, (bfd_vma) 0,
4673 htab->elf.sgot->contents + h->got.offset);
4674 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4675 }
4676
4677 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4678 }
4679
4680 if (h->needs_copy)
4681 {
4682 Elf_Internal_Rela rel;
4683
4684 /* This symbol needs a copy reloc. Set it up. */
4685
4686 if (h->dynindx == -1
4687 || (h->root.type != bfd_link_hash_defined
4688 && h->root.type != bfd_link_hash_defweak)
4689 || htab->srelbss == NULL)
4690 abort ();
4691
4692 rel.r_offset = (h->root.u.def.value
4693 + h->root.u.def.section->output_section->vma
4694 + h->root.u.def.section->output_offset);
4695 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4696 elf_append_rel (output_bfd, htab->srelbss, &rel);
4697 }
4698
4699 return TRUE;
4700 }
4701
4702 /* Finish up local dynamic symbol handling. We set the contents of
4703 various dynamic sections here. */
4704
4705 static bfd_boolean
elf_i386_finish_local_dynamic_symbol(void ** slot,void * inf)4706 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4707 {
4708 struct elf_link_hash_entry *h
4709 = (struct elf_link_hash_entry *) *slot;
4710 struct bfd_link_info *info
4711 = (struct bfd_link_info *) inf;
4712
4713 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4714 h, NULL);
4715 }
4716
4717 /* Used to decide how to sort relocs in an optimal manner for the
4718 dynamic linker, before writing them out. */
4719
4720 static enum elf_reloc_type_class
elf_i386_reloc_type_class(const Elf_Internal_Rela * rela)4721 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4722 {
4723 switch (ELF32_R_TYPE (rela->r_info))
4724 {
4725 case R_386_RELATIVE:
4726 return reloc_class_relative;
4727 case R_386_JUMP_SLOT:
4728 return reloc_class_plt;
4729 case R_386_COPY:
4730 return reloc_class_copy;
4731 default:
4732 return reloc_class_normal;
4733 }
4734 }
4735
4736 /* Finish up the dynamic sections. */
4737
4738 static bfd_boolean
elf_i386_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)4739 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4740 struct bfd_link_info *info)
4741 {
4742 struct elf_i386_link_hash_table *htab;
4743 bfd *dynobj;
4744 asection *sdyn;
4745 const struct elf_i386_backend_data *abed;
4746
4747 htab = elf_i386_hash_table (info);
4748 if (htab == NULL)
4749 return FALSE;
4750
4751 dynobj = htab->elf.dynobj;
4752 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4753 abed = get_elf_i386_backend_data (output_bfd);
4754
4755 if (htab->elf.dynamic_sections_created)
4756 {
4757 Elf32_External_Dyn *dyncon, *dynconend;
4758
4759 if (sdyn == NULL || htab->elf.sgot == NULL)
4760 abort ();
4761
4762 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4763 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4764 for (; dyncon < dynconend; dyncon++)
4765 {
4766 Elf_Internal_Dyn dyn;
4767 asection *s;
4768
4769 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4770
4771 switch (dyn.d_tag)
4772 {
4773 default:
4774 if (abed->is_vxworks
4775 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4776 break;
4777 continue;
4778
4779 case DT_PLTGOT:
4780 s = htab->elf.sgotplt;
4781 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4782 break;
4783
4784 case DT_JMPREL:
4785 s = htab->elf.srelplt;
4786 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4787 break;
4788
4789 case DT_PLTRELSZ:
4790 s = htab->elf.srelplt;
4791 dyn.d_un.d_val = s->size;
4792 break;
4793
4794 case DT_RELSZ:
4795 /* My reading of the SVR4 ABI indicates that the
4796 procedure linkage table relocs (DT_JMPREL) should be
4797 included in the overall relocs (DT_REL). This is
4798 what Solaris does. However, UnixWare can not handle
4799 that case. Therefore, we override the DT_RELSZ entry
4800 here to make it not include the JMPREL relocs. */
4801 s = htab->elf.srelplt;
4802 if (s == NULL)
4803 continue;
4804 dyn.d_un.d_val -= s->size;
4805 break;
4806
4807 case DT_REL:
4808 /* We may not be using the standard ELF linker script.
4809 If .rel.plt is the first .rel section, we adjust
4810 DT_REL to not include it. */
4811 s = htab->elf.srelplt;
4812 if (s == NULL)
4813 continue;
4814 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4815 continue;
4816 dyn.d_un.d_ptr += s->size;
4817 break;
4818 }
4819
4820 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4821 }
4822
4823 /* Fill in the first entry in the procedure linkage table. */
4824 if (htab->elf.splt && htab->elf.splt->size > 0)
4825 {
4826 if (info->shared)
4827 {
4828 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4829 abed->plt->plt0_entry_size);
4830 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4831 abed->plt0_pad_byte,
4832 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4833 }
4834 else
4835 {
4836 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4837 abed->plt->plt0_entry_size);
4838 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4839 abed->plt0_pad_byte,
4840 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4841 bfd_put_32 (output_bfd,
4842 (htab->elf.sgotplt->output_section->vma
4843 + htab->elf.sgotplt->output_offset
4844 + 4),
4845 htab->elf.splt->contents
4846 + abed->plt->plt0_got1_offset);
4847 bfd_put_32 (output_bfd,
4848 (htab->elf.sgotplt->output_section->vma
4849 + htab->elf.sgotplt->output_offset
4850 + 8),
4851 htab->elf.splt->contents
4852 + abed->plt->plt0_got2_offset);
4853
4854 if (abed->is_vxworks)
4855 {
4856 Elf_Internal_Rela rel;
4857
4858 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4859 On IA32 we use REL relocations so the addend goes in
4860 the PLT directly. */
4861 rel.r_offset = (htab->elf.splt->output_section->vma
4862 + htab->elf.splt->output_offset
4863 + abed->plt->plt0_got1_offset);
4864 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4865 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4866 htab->srelplt2->contents);
4867 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4868 rel.r_offset = (htab->elf.splt->output_section->vma
4869 + htab->elf.splt->output_offset
4870 + abed->plt->plt0_got2_offset);
4871 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4872 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4873 htab->srelplt2->contents +
4874 sizeof (Elf32_External_Rel));
4875 }
4876 }
4877
4878 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4879 really seem like the right value. */
4880 elf_section_data (htab->elf.splt->output_section)
4881 ->this_hdr.sh_entsize = 4;
4882
4883 /* Correct the .rel.plt.unloaded relocations. */
4884 if (abed->is_vxworks && !info->shared)
4885 {
4886 int num_plts = (htab->elf.splt->size
4887 / abed->plt->plt_entry_size) - 1;
4888 unsigned char *p;
4889
4890 p = htab->srelplt2->contents;
4891 if (info->shared)
4892 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4893 else
4894 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4895
4896 for (; num_plts; num_plts--)
4897 {
4898 Elf_Internal_Rela rel;
4899 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4900 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4901 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4902 p += sizeof (Elf32_External_Rel);
4903
4904 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4905 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4906 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4907 p += sizeof (Elf32_External_Rel);
4908 }
4909 }
4910 }
4911 }
4912
4913 if (htab->elf.sgotplt)
4914 {
4915 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4916 {
4917 (*_bfd_error_handler)
4918 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4919 return FALSE;
4920 }
4921
4922 /* Fill in the first three entries in the global offset table. */
4923 if (htab->elf.sgotplt->size > 0)
4924 {
4925 bfd_put_32 (output_bfd,
4926 (sdyn == NULL ? 0
4927 : sdyn->output_section->vma + sdyn->output_offset),
4928 htab->elf.sgotplt->contents);
4929 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4930 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4931 }
4932
4933 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4934 }
4935
4936 /* Adjust .eh_frame for .plt section. */
4937 if (htab->plt_eh_frame != NULL
4938 && htab->plt_eh_frame->contents != NULL)
4939 {
4940 if (htab->elf.splt != NULL
4941 && htab->elf.splt->size != 0
4942 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4943 && htab->elf.splt->output_section != NULL
4944 && htab->plt_eh_frame->output_section != NULL)
4945 {
4946 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4947 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4948 + htab->plt_eh_frame->output_offset
4949 + PLT_FDE_START_OFFSET;
4950 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4951 htab->plt_eh_frame->contents
4952 + PLT_FDE_START_OFFSET);
4953 }
4954 if (htab->plt_eh_frame->sec_info_type
4955 == SEC_INFO_TYPE_EH_FRAME)
4956 {
4957 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4958 htab->plt_eh_frame,
4959 htab->plt_eh_frame->contents))
4960 return FALSE;
4961 }
4962 }
4963
4964 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4965 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4966
4967 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4968 htab_traverse (htab->loc_hash_table,
4969 elf_i386_finish_local_dynamic_symbol,
4970 info);
4971
4972 return TRUE;
4973 }
4974
4975 /* Return address for Ith PLT stub in section PLT, for relocation REL
4976 or (bfd_vma) -1 if it should not be included. */
4977
4978 static bfd_vma
elf_i386_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)4979 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4980 const arelent *rel ATTRIBUTE_UNUSED)
4981 {
4982 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4983 }
4984
4985 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4986
4987 static bfd_boolean
elf_i386_hash_symbol(struct elf_link_hash_entry * h)4988 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4989 {
4990 if (h->plt.offset != (bfd_vma) -1
4991 && !h->def_regular
4992 && !h->pointer_equality_needed)
4993 return FALSE;
4994
4995 return _bfd_elf_hash_symbol (h);
4996 }
4997
4998 /* Hook called by the linker routine which adds symbols from an object
4999 file. */
5000
5001 static bfd_boolean
elf_i386_add_symbol_hook(bfd * abfd,struct bfd_link_info * info ATTRIBUTE_UNUSED,Elf_Internal_Sym * sym,const char ** namep ATTRIBUTE_UNUSED,flagword * flagsp ATTRIBUTE_UNUSED,asection ** secp ATTRIBUTE_UNUSED,bfd_vma * valp ATTRIBUTE_UNUSED)5002 elf_i386_add_symbol_hook (bfd * abfd,
5003 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5004 Elf_Internal_Sym * sym,
5005 const char ** namep ATTRIBUTE_UNUSED,
5006 flagword * flagsp ATTRIBUTE_UNUSED,
5007 asection ** secp ATTRIBUTE_UNUSED,
5008 bfd_vma * valp ATTRIBUTE_UNUSED)
5009 {
5010 if ((abfd->flags & DYNAMIC) == 0
5011 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5012 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5013 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5014
5015 return TRUE;
5016 }
5017
5018 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5019 #define TARGET_LITTLE_NAME "elf32-i386"
5020 #define ELF_ARCH bfd_arch_i386
5021 #define ELF_TARGET_ID I386_ELF_DATA
5022 #define ELF_MACHINE_CODE EM_386
5023 #define ELF_MAXPAGESIZE 0x1000
5024
5025 #define elf_backend_can_gc_sections 1
5026 #define elf_backend_can_refcount 1
5027 #define elf_backend_want_got_plt 1
5028 #define elf_backend_plt_readonly 1
5029 #define elf_backend_want_plt_sym 0
5030 #define elf_backend_got_header_size 12
5031 #define elf_backend_plt_alignment 4
5032
5033 /* Support RELA for objdump of prelink objects. */
5034 #define elf_info_to_howto elf_i386_info_to_howto_rel
5035 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5036
5037 #define bfd_elf32_mkobject elf_i386_mkobject
5038
5039 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5040 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5041 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5042 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5043 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5044
5045 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5046 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5047 #define elf_backend_check_relocs elf_i386_check_relocs
5048 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5049 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5050 #define elf_backend_fake_sections elf_i386_fake_sections
5051 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5052 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5053 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5054 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5055 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5056 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5057 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5058 #define elf_backend_relocate_section elf_i386_relocate_section
5059 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5060 #define elf_backend_always_size_sections elf_i386_always_size_sections
5061 #define elf_backend_omit_section_dynsym \
5062 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5063 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5064 #define elf_backend_hash_symbol elf_i386_hash_symbol
5065 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5066 #undef elf_backend_post_process_headers
5067 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5068
5069 #include "elf32-target.h"
5070
5071 /* FreeBSD support. */
5072
5073 #undef TARGET_LITTLE_SYM
5074 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5075 #undef TARGET_LITTLE_NAME
5076 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5077 #undef ELF_OSABI
5078 #define ELF_OSABI ELFOSABI_FREEBSD
5079
5080 /* The kernel recognizes executables as valid only if they carry a
5081 "FreeBSD" label in the ELF header. So we put this label on all
5082 executables and (for simplicity) also all other object files. */
5083
5084 static void
elf_i386_fbsd_post_process_headers(bfd * abfd,struct bfd_link_info * info)5085 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5086 {
5087 _bfd_elf_set_osabi (abfd, info);
5088
5089 #ifdef OLD_FREEBSD_ABI_LABEL
5090 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5091 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5092 #endif
5093 }
5094
5095 #undef elf_backend_post_process_headers
5096 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5097 #undef elf32_bed
5098 #define elf32_bed elf32_i386_fbsd_bed
5099
5100 #undef elf_backend_add_symbol_hook
5101
5102 #include "elf32-target.h"
5103
5104 /* Solaris 2. */
5105
5106 #undef TARGET_LITTLE_SYM
5107 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5108 #undef TARGET_LITTLE_NAME
5109 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5110
5111 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5112 objects won't be recognized. */
5113 #undef ELF_OSABI
5114
5115 #undef elf32_bed
5116 #define elf32_bed elf32_i386_sol2_bed
5117
5118 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5119 boundary. */
5120 #undef elf_backend_static_tls_alignment
5121 #define elf_backend_static_tls_alignment 8
5122
5123 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5124
5125 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5126 File, p.63. */
5127 #undef elf_backend_want_plt_sym
5128 #define elf_backend_want_plt_sym 1
5129
5130 #include "elf32-target.h"
5131
5132 /* Native Client support. */
5133
5134 #undef TARGET_LITTLE_SYM
5135 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5136 #undef TARGET_LITTLE_NAME
5137 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5138 #undef elf32_bed
5139 #define elf32_bed elf32_i386_nacl_bed
5140
5141 #undef ELF_MAXPAGESIZE
5142 #define ELF_MAXPAGESIZE 0x10000
5143
5144 /* Restore defaults. */
5145 #undef ELF_OSABI
5146 #undef elf_backend_want_plt_sym
5147 #define elf_backend_want_plt_sym 0
5148 #undef elf_backend_post_process_headers
5149 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5150 #undef elf_backend_static_tls_alignment
5151
5152 /* NaCl uses substantially different PLT entries for the same effects. */
5153
5154 #undef elf_backend_plt_alignment
5155 #define elf_backend_plt_alignment 5
5156 #define NACL_PLT_ENTRY_SIZE 64
5157 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5158
5159 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5160 {
5161 0xff, 0x35, /* pushl contents of address */
5162 0, 0, 0, 0, /* replaced with address of .got + 4. */
5163 0x8b, 0x0d, /* movl contents of address, %ecx */
5164 0, 0, 0, 0, /* replaced with address of .got + 8. */
5165 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5166 0xff, 0xe1 /* jmp *%ecx */
5167 };
5168
5169 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5170 {
5171 0x8b, 0x0d, /* movl contents of address, %ecx */
5172 0, 0, 0, 0, /* replaced with GOT slot address. */
5173 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5174 0xff, 0xe1, /* jmp *%ecx */
5175
5176 /* Pad to the next 32-byte boundary with nop instructions. */
5177 0x90,
5178 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5179 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5180
5181 /* Lazy GOT entries point here (32-byte aligned). */
5182 0x68, /* pushl immediate */
5183 0, 0, 0, 0, /* replaced with reloc offset. */
5184 0xe9, /* jmp relative */
5185 0, 0, 0, 0, /* replaced with offset to .plt. */
5186
5187 /* Pad to the next 32-byte boundary with nop instructions. */
5188 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5189 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5190 0x90, 0x90
5191 };
5192
5193 static const bfd_byte
5194 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5195 {
5196 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5197 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5198 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5199 0xff, 0xe1, /* jmp *%ecx */
5200
5201 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5202 so pad to that size with nop instructions. */
5203 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5204 };
5205
5206 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5207 {
5208 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5209 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5210 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5211 0xff, 0xe1, /* jmp *%ecx */
5212
5213 /* Pad to the next 32-byte boundary with nop instructions. */
5214 0x90,
5215 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5216 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5217
5218 /* Lazy GOT entries point here (32-byte aligned). */
5219 0x68, /* pushl immediate */
5220 0, 0, 0, 0, /* replaced with offset into relocation table. */
5221 0xe9, /* jmp relative */
5222 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5223
5224 /* Pad to the next 32-byte boundary with nop instructions. */
5225 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5226 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5227 0x90, 0x90
5228 };
5229
5230 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5231 {
5232 #if (PLT_CIE_LENGTH != 20 \
5233 || PLT_FDE_LENGTH != 36 \
5234 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5235 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5236 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5237 #endif
5238 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5239 0, 0, 0, 0, /* CIE ID */
5240 1, /* CIE version */
5241 'z', 'R', 0, /* Augmentation string */
5242 1, /* Code alignment factor */
5243 0x7c, /* Data alignment factor: -4 */
5244 8, /* Return address column */
5245 1, /* Augmentation size */
5246 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5247 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5248 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5249 DW_CFA_nop, DW_CFA_nop,
5250
5251 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5252 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5253 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5254 0, 0, 0, 0, /* .plt size goes here */
5255 0, /* Augmentation size */
5256 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5257 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5258 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5259 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5260 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5261 13, /* Block length */
5262 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5263 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5264 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5265 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5266 DW_CFA_nop, DW_CFA_nop
5267 };
5268
5269 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5270 {
5271 elf_i386_nacl_plt0_entry, /* plt0_entry */
5272 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5273 2, /* plt0_got1_offset */
5274 8, /* plt0_got2_offset */
5275 elf_i386_nacl_plt_entry, /* plt_entry */
5276 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5277 2, /* plt_got_offset */
5278 33, /* plt_reloc_offset */
5279 38, /* plt_plt_offset */
5280 32, /* plt_lazy_offset */
5281 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5282 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5283 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5284 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5285 };
5286
5287 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5288 {
5289 &elf_i386_nacl_plt, /* plt */
5290 0x90, /* plt0_pad_byte: nop insn */
5291 0, /* is_vxworks */
5292 };
5293
5294 #undef elf_backend_arch_data
5295 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5296
5297 #undef elf_backend_modify_segment_map
5298 #define elf_backend_modify_segment_map nacl_modify_segment_map
5299 #undef elf_backend_modify_program_headers
5300 #define elf_backend_modify_program_headers nacl_modify_program_headers
5301
5302 #include "elf32-target.h"
5303
5304 /* Restore defaults. */
5305 #undef elf_backend_modify_segment_map
5306 #undef elf_backend_modify_program_headers
5307
5308 /* VxWorks support. */
5309
5310 #undef TARGET_LITTLE_SYM
5311 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5312 #undef TARGET_LITTLE_NAME
5313 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5314 #undef ELF_OSABI
5315 #undef elf_backend_plt_alignment
5316 #define elf_backend_plt_alignment 4
5317
5318 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5319 {
5320 &elf_i386_plt, /* plt */
5321 0x90, /* plt0_pad_byte */
5322 1, /* is_vxworks */
5323 };
5324
5325 #undef elf_backend_arch_data
5326 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5327
5328 #undef elf_backend_relocs_compatible
5329 #undef elf_backend_post_process_headers
5330 #undef elf_backend_add_symbol_hook
5331 #define elf_backend_add_symbol_hook \
5332 elf_vxworks_add_symbol_hook
5333 #undef elf_backend_link_output_symbol_hook
5334 #define elf_backend_link_output_symbol_hook \
5335 elf_vxworks_link_output_symbol_hook
5336 #undef elf_backend_emit_relocs
5337 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5338 #undef elf_backend_final_write_processing
5339 #define elf_backend_final_write_processing \
5340 elf_vxworks_final_write_processing
5341 #undef elf_backend_static_tls_alignment
5342
5343 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5344 define it. */
5345 #undef elf_backend_want_plt_sym
5346 #define elf_backend_want_plt_sym 1
5347
5348 #undef elf32_bed
5349 #define elf32_bed elf32_i386_vxworks_bed
5350
5351 #include "elf32-target.h"
5352