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1 | /* X86-64 specific support for 64-bit ELF | |
2 | Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by Jan Hubicka <jh@suse.cz>. | |
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 "bfd_stdint.h" | |
29 | #include "objalloc.h" | |
30 | #include "hashtab.h" | |
31 | ||
32 | #include "elf/x86-64.h" | |
33 | ||
34 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ | |
35 | #define MINUS_ONE (~ (bfd_vma) 0) | |
36 | ||
37 | /* The relocation "howto" table. Order of fields: | |
38 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, | |
39 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ | |
40 | static reloc_howto_type x86_64_elf_howto_table[] = | |
41 | { | |
42 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, | |
43 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, | |
44 | FALSE), | |
45 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
46 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, | |
47 | FALSE), | |
48 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
49 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, | |
50 | TRUE), | |
51 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
52 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, | |
53 | FALSE), | |
54 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
55 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, | |
56 | TRUE), | |
57 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, | |
58 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, | |
59 | FALSE), | |
60 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
61 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, | |
62 | MINUS_ONE, FALSE), | |
63 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
64 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, | |
65 | MINUS_ONE, FALSE), | |
66 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
67 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, | |
68 | MINUS_ONE, FALSE), | |
69 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
70 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, | |
71 | 0xffffffff, TRUE), | |
72 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, | |
73 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, | |
74 | FALSE), | |
75 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
76 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, | |
77 | FALSE), | |
78 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, | |
79 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), | |
80 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, | |
81 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), | |
82 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, | |
83 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), | |
84 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, | |
85 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), | |
86 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
87 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, | |
88 | MINUS_ONE, FALSE), | |
89 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
90 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, | |
91 | MINUS_ONE, FALSE), | |
92 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
93 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, | |
94 | MINUS_ONE, FALSE), | |
95 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
96 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, | |
97 | 0xffffffff, TRUE), | |
98 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
99 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, | |
100 | 0xffffffff, TRUE), | |
101 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
102 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, | |
103 | 0xffffffff, FALSE), | |
104 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
105 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, | |
106 | 0xffffffff, TRUE), | |
107 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
108 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, | |
109 | 0xffffffff, FALSE), | |
110 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, | |
111 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, | |
112 | TRUE), | |
113 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
114 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", | |
115 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), | |
116 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
117 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", | |
118 | FALSE, 0xffffffff, 0xffffffff, TRUE), | |
119 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
120 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, | |
121 | FALSE), | |
122 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, | |
123 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, | |
124 | MINUS_ONE, TRUE), | |
125 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, | |
126 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", | |
127 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), | |
128 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
129 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, | |
130 | MINUS_ONE, FALSE), | |
131 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
132 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, | |
133 | MINUS_ONE, FALSE), | |
134 | EMPTY_HOWTO (32), | |
135 | EMPTY_HOWTO (33), | |
136 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, | |
137 | complain_overflow_bitfield, bfd_elf_generic_reloc, | |
138 | "R_X86_64_GOTPC32_TLSDESC", | |
139 | FALSE, 0xffffffff, 0xffffffff, TRUE), | |
140 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, | |
141 | complain_overflow_dont, bfd_elf_generic_reloc, | |
142 | "R_X86_64_TLSDESC_CALL", | |
143 | FALSE, 0, 0, FALSE), | |
144 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, | |
145 | complain_overflow_bitfield, bfd_elf_generic_reloc, | |
146 | "R_X86_64_TLSDESC", | |
147 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), | |
148 | HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
149 | bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, | |
150 | MINUS_ONE, FALSE), | |
151 | ||
152 | /* We have a gap in the reloc numbers here. | |
153 | R_X86_64_standard counts the number up to this point, and | |
154 | R_X86_64_vt_offset is the value to subtract from a reloc type of | |
155 | R_X86_64_GNU_VT* to form an index into this table. */ | |
156 | #define R_X86_64_standard (R_X86_64_IRELATIVE + 1) | |
157 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) | |
158 | ||
159 | /* GNU extension to record C++ vtable hierarchy. */ | |
160 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, | |
161 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), | |
162 | ||
163 | /* GNU extension to record C++ vtable member usage. */ | |
164 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, | |
165 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, | |
166 | FALSE) | |
167 | }; | |
168 | ||
169 | #define IS_X86_64_PCREL_TYPE(TYPE) \ | |
170 | ( ((TYPE) == R_X86_64_PC8) \ | |
171 | || ((TYPE) == R_X86_64_PC16) \ | |
172 | || ((TYPE) == R_X86_64_PC32) \ | |
173 | || ((TYPE) == R_X86_64_PC64)) | |
174 | ||
175 | /* Map BFD relocs to the x86_64 elf relocs. */ | |
176 | struct elf_reloc_map | |
177 | { | |
178 | bfd_reloc_code_real_type bfd_reloc_val; | |
179 | unsigned char elf_reloc_val; | |
180 | }; | |
181 | ||
182 | static const struct elf_reloc_map x86_64_reloc_map[] = | |
183 | { | |
184 | { BFD_RELOC_NONE, R_X86_64_NONE, }, | |
185 | { BFD_RELOC_64, R_X86_64_64, }, | |
186 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, | |
187 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, | |
188 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, | |
189 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, | |
190 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, | |
191 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, | |
192 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, | |
193 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, | |
194 | { BFD_RELOC_32, R_X86_64_32, }, | |
195 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, | |
196 | { BFD_RELOC_16, R_X86_64_16, }, | |
197 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, | |
198 | { BFD_RELOC_8, R_X86_64_8, }, | |
199 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, | |
200 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, | |
201 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, | |
202 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, | |
203 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, | |
204 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, | |
205 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, | |
206 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, | |
207 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, | |
208 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, | |
209 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, | |
210 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, | |
211 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, | |
212 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, | |
213 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, | |
214 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, | |
215 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, | |
216 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, | |
217 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, | |
218 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, | |
219 | { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, | |
220 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, | |
221 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, | |
222 | }; | |
223 | ||
224 | static reloc_howto_type * | |
225 | elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) | |
226 | { | |
227 | unsigned i; | |
228 | ||
229 | if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT | |
230 | || r_type >= (unsigned int) R_X86_64_max) | |
231 | { | |
232 | if (r_type >= (unsigned int) R_X86_64_standard) | |
233 | { | |
234 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), | |
235 | abfd, (int) r_type); | |
236 | r_type = R_X86_64_NONE; | |
237 | } | |
238 | i = r_type; | |
239 | } | |
240 | else | |
241 | i = r_type - (unsigned int) R_X86_64_vt_offset; | |
242 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); | |
243 | return &x86_64_elf_howto_table[i]; | |
244 | } | |
245 | ||
246 | /* Given a BFD reloc type, return a HOWTO structure. */ | |
247 | static reloc_howto_type * | |
248 | elf64_x86_64_reloc_type_lookup (bfd *abfd, | |
249 | bfd_reloc_code_real_type code) | |
250 | { | |
251 | unsigned int i; | |
252 | ||
253 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); | |
254 | i++) | |
255 | { | |
256 | if (x86_64_reloc_map[i].bfd_reloc_val == code) | |
257 | return elf64_x86_64_rtype_to_howto (abfd, | |
258 | x86_64_reloc_map[i].elf_reloc_val); | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static reloc_howto_type * | |
264 | elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
265 | const char *r_name) | |
266 | { | |
267 | unsigned int i; | |
268 | ||
269 | for (i = 0; | |
270 | i < (sizeof (x86_64_elf_howto_table) | |
271 | / sizeof (x86_64_elf_howto_table[0])); | |
272 | i++) | |
273 | if (x86_64_elf_howto_table[i].name != NULL | |
274 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) | |
275 | return &x86_64_elf_howto_table[i]; | |
276 | ||
277 | return NULL; | |
278 | } | |
279 | ||
280 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ | |
281 | ||
282 | static void | |
283 | elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, | |
284 | Elf_Internal_Rela *dst) | |
285 | { | |
286 | unsigned r_type; | |
287 | ||
288 | r_type = ELF64_R_TYPE (dst->r_info); | |
289 | cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type); | |
290 | BFD_ASSERT (r_type == cache_ptr->howto->type); | |
291 | } | |
292 | \f | |
293 | /* Support for core dump NOTE sections. */ | |
294 | static bfd_boolean | |
295 | elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) | |
296 | { | |
297 | int offset; | |
298 | size_t size; | |
299 | ||
300 | switch (note->descsz) | |
301 | { | |
302 | default: | |
303 | return FALSE; | |
304 | ||
305 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ | |
306 | /* pr_cursig */ | |
307 | elf_tdata (abfd)->core_signal | |
308 | = bfd_get_16 (abfd, note->descdata + 12); | |
309 | ||
310 | /* pr_pid */ | |
311 | elf_tdata (abfd)->core_pid | |
312 | = bfd_get_32 (abfd, note->descdata + 32); | |
313 | ||
314 | /* pr_reg */ | |
315 | offset = 112; | |
316 | size = 216; | |
317 | ||
318 | break; | |
319 | } | |
320 | ||
321 | /* Make a ".reg/999" section. */ | |
322 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", | |
323 | size, note->descpos + offset); | |
324 | } | |
325 | ||
326 | static bfd_boolean | |
327 | elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) | |
328 | { | |
329 | switch (note->descsz) | |
330 | { | |
331 | default: | |
332 | return FALSE; | |
333 | ||
334 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ | |
335 | elf_tdata (abfd)->core_program | |
336 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); | |
337 | elf_tdata (abfd)->core_command | |
338 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); | |
339 | } | |
340 | ||
341 | /* Note that for some reason, a spurious space is tacked | |
342 | onto the end of the args in some (at least one anyway) | |
343 | implementations, so strip it off if it exists. */ | |
344 | ||
345 | { | |
346 | char *command = elf_tdata (abfd)->core_command; | |
347 | int n = strlen (command); | |
348 | ||
349 | if (0 < n && command[n - 1] == ' ') | |
350 | command[n - 1] = '\0'; | |
351 | } | |
352 | ||
353 | return TRUE; | |
354 | } | |
355 | \f | |
356 | /* Functions for the x86-64 ELF linker. */ | |
357 | ||
358 | /* The name of the dynamic interpreter. This is put in the .interp | |
359 | section. */ | |
360 | ||
361 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" | |
362 | ||
363 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid | |
364 | copying dynamic variables from a shared lib into an app's dynbss | |
365 | section, and instead use a dynamic relocation to point into the | |
366 | shared lib. */ | |
367 | #define ELIMINATE_COPY_RELOCS 1 | |
368 | ||
369 | /* The size in bytes of an entry in the global offset table. */ | |
370 | ||
371 | #define GOT_ENTRY_SIZE 8 | |
372 | ||
373 | /* The size in bytes of an entry in the procedure linkage table. */ | |
374 | ||
375 | #define PLT_ENTRY_SIZE 16 | |
376 | ||
377 | /* The first entry in a procedure linkage table looks like this. See the | |
378 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ | |
379 | ||
380 | static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = | |
381 | { | |
382 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ | |
383 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ | |
384 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ | |
385 | }; | |
386 | ||
387 | /* Subsequent entries in a procedure linkage table look like this. */ | |
388 | ||
389 | static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = | |
390 | { | |
391 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ | |
392 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ | |
393 | 0x68, /* pushq immediate */ | |
394 | 0, 0, 0, 0, /* replaced with index into relocation table. */ | |
395 | 0xe9, /* jmp relative */ | |
396 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ | |
397 | }; | |
398 | ||
399 | /* x86-64 ELF linker hash entry. */ | |
400 | ||
401 | struct elf64_x86_64_link_hash_entry | |
402 | { | |
403 | struct elf_link_hash_entry elf; | |
404 | ||
405 | /* Track dynamic relocs copied for this symbol. */ | |
406 | struct elf_dyn_relocs *dyn_relocs; | |
407 | ||
408 | #define GOT_UNKNOWN 0 | |
409 | #define GOT_NORMAL 1 | |
410 | #define GOT_TLS_GD 2 | |
411 | #define GOT_TLS_IE 3 | |
412 | #define GOT_TLS_GDESC 4 | |
413 | #define GOT_TLS_GD_BOTH_P(type) \ | |
414 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) | |
415 | #define GOT_TLS_GD_P(type) \ | |
416 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) | |
417 | #define GOT_TLS_GDESC_P(type) \ | |
418 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) | |
419 | #define GOT_TLS_GD_ANY_P(type) \ | |
420 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) | |
421 | unsigned char tls_type; | |
422 | ||
423 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, | |
424 | starting at the end of the jump table. */ | |
425 | bfd_vma tlsdesc_got; | |
426 | }; | |
427 | ||
428 | #define elf64_x86_64_hash_entry(ent) \ | |
429 | ((struct elf64_x86_64_link_hash_entry *)(ent)) | |
430 | ||
431 | struct elf64_x86_64_obj_tdata | |
432 | { | |
433 | struct elf_obj_tdata root; | |
434 | ||
435 | /* tls_type for each local got entry. */ | |
436 | char *local_got_tls_type; | |
437 | ||
438 | /* GOTPLT entries for TLS descriptors. */ | |
439 | bfd_vma *local_tlsdesc_gotent; | |
440 | }; | |
441 | ||
442 | #define elf64_x86_64_tdata(abfd) \ | |
443 | ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) | |
444 | ||
445 | #define elf64_x86_64_local_got_tls_type(abfd) \ | |
446 | (elf64_x86_64_tdata (abfd)->local_got_tls_type) | |
447 | ||
448 | #define elf64_x86_64_local_tlsdesc_gotent(abfd) \ | |
449 | (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent) | |
450 | ||
451 | #define is_x86_64_elf(bfd) \ | |
452 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
453 | && elf_tdata (bfd) != NULL \ | |
454 | && elf_object_id (bfd) == X86_64_ELF_TDATA) | |
455 | ||
456 | static bfd_boolean | |
457 | elf64_x86_64_mkobject (bfd *abfd) | |
458 | { | |
459 | return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata), | |
460 | X86_64_ELF_TDATA); | |
461 | } | |
462 | ||
463 | /* x86-64 ELF linker hash table. */ | |
464 | ||
465 | struct elf64_x86_64_link_hash_table | |
466 | { | |
467 | struct elf_link_hash_table elf; | |
468 | ||
469 | /* Short-cuts to get to dynamic linker sections. */ | |
470 | asection *sdynbss; | |
471 | asection *srelbss; | |
472 | ||
473 | /* The offset into splt of the PLT entry for the TLS descriptor | |
474 | resolver. Special values are 0, if not necessary (or not found | |
475 | to be necessary yet), and -1 if needed but not determined | |
476 | yet. */ | |
477 | bfd_vma tlsdesc_plt; | |
478 | /* The offset into sgot of the GOT entry used by the PLT entry | |
479 | above. */ | |
480 | bfd_vma tlsdesc_got; | |
481 | ||
482 | union { | |
483 | bfd_signed_vma refcount; | |
484 | bfd_vma offset; | |
485 | } tls_ld_got; | |
486 | ||
487 | /* The amount of space used by the jump slots in the GOT. */ | |
488 | bfd_vma sgotplt_jump_table_size; | |
489 | ||
490 | /* Small local sym cache. */ | |
491 | struct sym_cache sym_cache; | |
492 | ||
493 | /* _TLS_MODULE_BASE_ symbol. */ | |
494 | struct bfd_link_hash_entry *tls_module_base; | |
495 | ||
496 | /* Used by local STT_GNU_IFUNC symbols. */ | |
497 | htab_t loc_hash_table; | |
498 | void *loc_hash_memory; | |
499 | }; | |
500 | ||
501 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ | |
502 | ||
503 | #define elf64_x86_64_hash_table(p) \ | |
504 | ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) | |
505 | ||
506 | #define elf64_x86_64_compute_jump_table_size(htab) \ | |
507 | ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE) | |
508 | ||
509 | /* Create an entry in an x86-64 ELF linker hash table. */ | |
510 | ||
511 | static struct bfd_hash_entry * | |
512 | elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry, | |
513 | struct bfd_hash_table *table, | |
514 | const char *string) | |
515 | { | |
516 | /* Allocate the structure if it has not already been allocated by a | |
517 | subclass. */ | |
518 | if (entry == NULL) | |
519 | { | |
520 | entry = bfd_hash_allocate (table, | |
521 | sizeof (struct elf64_x86_64_link_hash_entry)); | |
522 | if (entry == NULL) | |
523 | return entry; | |
524 | } | |
525 | ||
526 | /* Call the allocation method of the superclass. */ | |
527 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
528 | if (entry != NULL) | |
529 | { | |
530 | struct elf64_x86_64_link_hash_entry *eh; | |
531 | ||
532 | eh = (struct elf64_x86_64_link_hash_entry *) entry; | |
533 | eh->dyn_relocs = NULL; | |
534 | eh->tls_type = GOT_UNKNOWN; | |
535 | eh->tlsdesc_got = (bfd_vma) -1; | |
536 | } | |
537 | ||
538 | return entry; | |
539 | } | |
540 | ||
541 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
542 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
543 | as global symbol. We reuse indx and dynstr_index for local symbol | |
544 | hash since they aren't used by global symbols in this backend. */ | |
545 | ||
546 | static hashval_t | |
547 | elf64_x86_64_local_htab_hash (const void *ptr) | |
548 | { | |
549 | struct elf_link_hash_entry *h | |
550 | = (struct elf_link_hash_entry *) ptr; | |
551 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
552 | } | |
553 | ||
554 | /* Compare local hash entries. */ | |
555 | ||
556 | static int | |
557 | elf64_x86_64_local_htab_eq (const void *ptr1, const void *ptr2) | |
558 | { | |
559 | struct elf_link_hash_entry *h1 | |
560 | = (struct elf_link_hash_entry *) ptr1; | |
561 | struct elf_link_hash_entry *h2 | |
562 | = (struct elf_link_hash_entry *) ptr2; | |
563 | ||
564 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
565 | } | |
566 | ||
567 | /* Find and/or create a hash entry for local symbol. */ | |
568 | ||
569 | static struct elf_link_hash_entry * | |
570 | elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table *htab, | |
571 | bfd *abfd, const Elf_Internal_Rela *rel, | |
572 | bfd_boolean create) | |
573 | { | |
574 | struct elf64_x86_64_link_hash_entry e, *ret; | |
575 | asection *sec = abfd->sections; | |
576 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
577 | ELF64_R_SYM (rel->r_info)); | |
578 | void **slot; | |
579 | ||
580 | e.elf.indx = sec->id; | |
581 | e.elf.dynstr_index = ELF64_R_SYM (rel->r_info); | |
582 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
583 | create ? INSERT : NO_INSERT); | |
584 | ||
585 | if (!slot) | |
586 | return NULL; | |
587 | ||
588 | if (*slot) | |
589 | { | |
590 | ret = (struct elf64_x86_64_link_hash_entry *) *slot; | |
591 | return &ret->elf; | |
592 | } | |
593 | ||
594 | ret = (struct elf64_x86_64_link_hash_entry *) | |
595 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
596 | sizeof (struct elf64_x86_64_link_hash_entry)); | |
597 | if (ret) | |
598 | { | |
599 | memset (ret, 0, sizeof (*ret)); | |
600 | ret->elf.indx = sec->id; | |
601 | ret->elf.dynstr_index = ELF64_R_SYM (rel->r_info); | |
602 | ret->elf.dynindx = -1; | |
603 | ret->elf.plt.offset = (bfd_vma) -1; | |
604 | ret->elf.got.offset = (bfd_vma) -1; | |
605 | *slot = ret; | |
606 | } | |
607 | return &ret->elf; | |
608 | } | |
609 | ||
610 | /* Create an X86-64 ELF linker hash table. */ | |
611 | ||
612 | static struct bfd_link_hash_table * | |
613 | elf64_x86_64_link_hash_table_create (bfd *abfd) | |
614 | { | |
615 | struct elf64_x86_64_link_hash_table *ret; | |
616 | bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); | |
617 | ||
618 | ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); | |
619 | if (ret == NULL) | |
620 | return NULL; | |
621 | ||
622 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
623 | elf64_x86_64_link_hash_newfunc, | |
624 | sizeof (struct elf64_x86_64_link_hash_entry))) | |
625 | { | |
626 | free (ret); | |
627 | return NULL; | |
628 | } | |
629 | ||
630 | ret->sdynbss = NULL; | |
631 | ret->srelbss = NULL; | |
632 | ret->sym_cache.abfd = NULL; | |
633 | ret->tlsdesc_plt = 0; | |
634 | ret->tlsdesc_got = 0; | |
635 | ret->tls_ld_got.refcount = 0; | |
636 | ret->sgotplt_jump_table_size = 0; | |
637 | ret->tls_module_base = NULL; | |
638 | ||
639 | ret->loc_hash_table = htab_try_create (1024, | |
640 | elf64_x86_64_local_htab_hash, | |
641 | elf64_x86_64_local_htab_eq, | |
642 | NULL); | |
643 | ret->loc_hash_memory = objalloc_create (); | |
644 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
645 | { | |
646 | free (ret); | |
647 | return NULL; | |
648 | } | |
649 | ||
650 | return &ret->elf.root; | |
651 | } | |
652 | ||
653 | /* Destroy an X86-64 ELF linker hash table. */ | |
654 | ||
655 | static void | |
656 | elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash) | |
657 | { | |
658 | struct elf64_x86_64_link_hash_table *htab | |
659 | = (struct elf64_x86_64_link_hash_table *) hash; | |
660 | ||
661 | if (htab->loc_hash_table) | |
662 | htab_delete (htab->loc_hash_table); | |
663 | if (htab->loc_hash_memory) | |
664 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
665 | _bfd_generic_link_hash_table_free (hash); | |
666 | } | |
667 | ||
668 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
669 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
670 | hash table. */ | |
671 | ||
672 | static bfd_boolean | |
673 | elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) | |
674 | { | |
675 | struct elf64_x86_64_link_hash_table *htab; | |
676 | ||
677 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
678 | return FALSE; | |
679 | ||
680 | htab = elf64_x86_64_hash_table (info); | |
681 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); | |
682 | if (!info->shared) | |
683 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
684 | ||
685 | if (!htab->sdynbss | |
686 | || (!info->shared && !htab->srelbss)) | |
687 | abort (); | |
688 | ||
689 | return TRUE; | |
690 | } | |
691 | ||
692 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
693 | ||
694 | static void | |
695 | elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info, | |
696 | struct elf_link_hash_entry *dir, | |
697 | struct elf_link_hash_entry *ind) | |
698 | { | |
699 | struct elf64_x86_64_link_hash_entry *edir, *eind; | |
700 | ||
701 | edir = (struct elf64_x86_64_link_hash_entry *) dir; | |
702 | eind = (struct elf64_x86_64_link_hash_entry *) ind; | |
703 | ||
704 | if (eind->dyn_relocs != NULL) | |
705 | { | |
706 | if (edir->dyn_relocs != NULL) | |
707 | { | |
708 | struct elf_dyn_relocs **pp; | |
709 | struct elf_dyn_relocs *p; | |
710 | ||
711 | /* Add reloc counts against the indirect sym to the direct sym | |
712 | list. Merge any entries against the same section. */ | |
713 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
714 | { | |
715 | struct elf_dyn_relocs *q; | |
716 | ||
717 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
718 | if (q->sec == p->sec) | |
719 | { | |
720 | q->pc_count += p->pc_count; | |
721 | q->count += p->count; | |
722 | *pp = p->next; | |
723 | break; | |
724 | } | |
725 | if (q == NULL) | |
726 | pp = &p->next; | |
727 | } | |
728 | *pp = edir->dyn_relocs; | |
729 | } | |
730 | ||
731 | edir->dyn_relocs = eind->dyn_relocs; | |
732 | eind->dyn_relocs = NULL; | |
733 | } | |
734 | ||
735 | if (ind->root.type == bfd_link_hash_indirect | |
736 | && dir->got.refcount <= 0) | |
737 | { | |
738 | edir->tls_type = eind->tls_type; | |
739 | eind->tls_type = GOT_UNKNOWN; | |
740 | } | |
741 | ||
742 | if (ELIMINATE_COPY_RELOCS | |
743 | && ind->root.type != bfd_link_hash_indirect | |
744 | && dir->dynamic_adjusted) | |
745 | { | |
746 | /* If called to transfer flags for a weakdef during processing | |
747 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
748 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
749 | dir->ref_dynamic |= ind->ref_dynamic; | |
750 | dir->ref_regular |= ind->ref_regular; | |
751 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
752 | dir->needs_plt |= ind->needs_plt; | |
753 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
754 | } | |
755 | else | |
756 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
757 | } | |
758 | ||
759 | static bfd_boolean | |
760 | elf64_x86_64_elf_object_p (bfd *abfd) | |
761 | { | |
762 | /* Set the right machine number for an x86-64 elf64 file. */ | |
763 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); | |
764 | return TRUE; | |
765 | } | |
766 | ||
767 | typedef union | |
768 | { | |
769 | unsigned char c[2]; | |
770 | uint16_t i; | |
771 | } | |
772 | x86_64_opcode16; | |
773 | ||
774 | typedef union | |
775 | { | |
776 | unsigned char c[4]; | |
777 | uint32_t i; | |
778 | } | |
779 | x86_64_opcode32; | |
780 | ||
781 | /* Return TRUE if the TLS access code sequence support transition | |
782 | from R_TYPE. */ | |
783 | ||
784 | static bfd_boolean | |
785 | elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec, | |
786 | bfd_byte *contents, | |
787 | Elf_Internal_Shdr *symtab_hdr, | |
788 | struct elf_link_hash_entry **sym_hashes, | |
789 | unsigned int r_type, | |
790 | const Elf_Internal_Rela *rel, | |
791 | const Elf_Internal_Rela *relend) | |
792 | { | |
793 | unsigned int val; | |
794 | unsigned long r_symndx; | |
795 | struct elf_link_hash_entry *h; | |
796 | bfd_vma offset; | |
797 | ||
798 | /* Get the section contents. */ | |
799 | if (contents == NULL) | |
800 | { | |
801 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
802 | contents = elf_section_data (sec)->this_hdr.contents; | |
803 | else | |
804 | { | |
805 | /* FIXME: How to better handle error condition? */ | |
806 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) | |
807 | return FALSE; | |
808 | ||
809 | /* Cache the section contents for elf_link_input_bfd. */ | |
810 | elf_section_data (sec)->this_hdr.contents = contents; | |
811 | } | |
812 | } | |
813 | ||
814 | offset = rel->r_offset; | |
815 | switch (r_type) | |
816 | { | |
817 | case R_X86_64_TLSGD: | |
818 | case R_X86_64_TLSLD: | |
819 | if ((rel + 1) >= relend) | |
820 | return FALSE; | |
821 | ||
822 | if (r_type == R_X86_64_TLSGD) | |
823 | { | |
824 | /* Check transition from GD access model. Only | |
825 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
826 | .word 0x6666; rex64; call __tls_get_addr | |
827 | can transit to different access model. */ | |
828 | ||
829 | static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } }, | |
830 | call = { { 0x66, 0x66, 0x48, 0xe8 } }; | |
831 | if (offset < 4 | |
832 | || (offset + 12) > sec->size | |
833 | || bfd_get_32 (abfd, contents + offset - 4) != leaq.i | |
834 | || bfd_get_32 (abfd, contents + offset + 4) != call.i) | |
835 | return FALSE; | |
836 | } | |
837 | else | |
838 | { | |
839 | /* Check transition from LD access model. Only | |
840 | leaq foo@tlsld(%rip), %rdi; | |
841 | call __tls_get_addr | |
842 | can transit to different access model. */ | |
843 | ||
844 | static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } }; | |
845 | x86_64_opcode32 op; | |
846 | ||
847 | if (offset < 3 || (offset + 9) > sec->size) | |
848 | return FALSE; | |
849 | ||
850 | op.i = bfd_get_32 (abfd, contents + offset - 3); | |
851 | op.c[3] = bfd_get_8 (abfd, contents + offset + 4); | |
852 | if (op.i != ld.i) | |
853 | return FALSE; | |
854 | } | |
855 | ||
856 | r_symndx = ELF64_R_SYM (rel[1].r_info); | |
857 | if (r_symndx < symtab_hdr->sh_info) | |
858 | return FALSE; | |
859 | ||
860 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
861 | /* Use strncmp to check __tls_get_addr since __tls_get_addr | |
862 | may be versioned. */ | |
863 | return (h != NULL | |
864 | && h->root.root.string != NULL | |
865 | && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32 | |
866 | || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32) | |
867 | && (strncmp (h->root.root.string, | |
868 | "__tls_get_addr", 14) == 0)); | |
869 | ||
870 | case R_X86_64_GOTTPOFF: | |
871 | /* Check transition from IE access model: | |
872 | movq foo@gottpoff(%rip), %reg | |
873 | addq foo@gottpoff(%rip), %reg | |
874 | */ | |
875 | ||
876 | if (offset < 3 || (offset + 4) > sec->size) | |
877 | return FALSE; | |
878 | ||
879 | val = bfd_get_8 (abfd, contents + offset - 3); | |
880 | if (val != 0x48 && val != 0x4c) | |
881 | return FALSE; | |
882 | ||
883 | val = bfd_get_8 (abfd, contents + offset - 2); | |
884 | if (val != 0x8b && val != 0x03) | |
885 | return FALSE; | |
886 | ||
887 | val = bfd_get_8 (abfd, contents + offset - 1); | |
888 | return (val & 0xc7) == 5; | |
889 | ||
890 | case R_X86_64_GOTPC32_TLSDESC: | |
891 | /* Check transition from GDesc access model: | |
892 | leaq x@tlsdesc(%rip), %rax | |
893 | ||
894 | Make sure it's a leaq adding rip to a 32-bit offset | |
895 | into any register, although it's probably almost always | |
896 | going to be rax. */ | |
897 | ||
898 | if (offset < 3 || (offset + 4) > sec->size) | |
899 | return FALSE; | |
900 | ||
901 | val = bfd_get_8 (abfd, contents + offset - 3); | |
902 | if ((val & 0xfb) != 0x48) | |
903 | return FALSE; | |
904 | ||
905 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) | |
906 | return FALSE; | |
907 | ||
908 | val = bfd_get_8 (abfd, contents + offset - 1); | |
909 | return (val & 0xc7) == 0x05; | |
910 | ||
911 | case R_X86_64_TLSDESC_CALL: | |
912 | /* Check transition from GDesc access model: | |
913 | call *x@tlsdesc(%rax) | |
914 | */ | |
915 | if (offset + 2 <= sec->size) | |
916 | { | |
917 | /* Make sure that it's a call *x@tlsdesc(%rax). */ | |
918 | static x86_64_opcode16 call = { { 0xff, 0x10 } }; | |
919 | return bfd_get_16 (abfd, contents + offset) == call.i; | |
920 | } | |
921 | ||
922 | return FALSE; | |
923 | ||
924 | default: | |
925 | abort (); | |
926 | } | |
927 | } | |
928 | ||
929 | /* Return TRUE if the TLS access transition is OK or no transition | |
930 | will be performed. Update R_TYPE if there is a transition. */ | |
931 | ||
932 | static bfd_boolean | |
933 | elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, | |
934 | asection *sec, bfd_byte *contents, | |
935 | Elf_Internal_Shdr *symtab_hdr, | |
936 | struct elf_link_hash_entry **sym_hashes, | |
937 | unsigned int *r_type, int tls_type, | |
938 | const Elf_Internal_Rela *rel, | |
939 | const Elf_Internal_Rela *relend, | |
940 | struct elf_link_hash_entry *h) | |
941 | { | |
942 | unsigned int from_type = *r_type; | |
943 | unsigned int to_type = from_type; | |
944 | bfd_boolean check = TRUE; | |
945 | ||
946 | switch (from_type) | |
947 | { | |
948 | case R_X86_64_TLSGD: | |
949 | case R_X86_64_GOTPC32_TLSDESC: | |
950 | case R_X86_64_TLSDESC_CALL: | |
951 | case R_X86_64_GOTTPOFF: | |
952 | if (!info->shared) | |
953 | { | |
954 | if (h == NULL) | |
955 | to_type = R_X86_64_TPOFF32; | |
956 | else | |
957 | to_type = R_X86_64_GOTTPOFF; | |
958 | } | |
959 | ||
960 | /* When we are called from elf64_x86_64_relocate_section, | |
961 | CONTENTS isn't NULL and there may be additional transitions | |
962 | based on TLS_TYPE. */ | |
963 | if (contents != NULL) | |
964 | { | |
965 | unsigned int new_to_type = to_type; | |
966 | ||
967 | if (!info->shared | |
968 | && h != NULL | |
969 | && h->dynindx == -1 | |
970 | && tls_type == GOT_TLS_IE) | |
971 | new_to_type = R_X86_64_TPOFF32; | |
972 | ||
973 | if (to_type == R_X86_64_TLSGD | |
974 | || to_type == R_X86_64_GOTPC32_TLSDESC | |
975 | || to_type == R_X86_64_TLSDESC_CALL) | |
976 | { | |
977 | if (tls_type == GOT_TLS_IE) | |
978 | new_to_type = R_X86_64_GOTTPOFF; | |
979 | } | |
980 | ||
981 | /* We checked the transition before when we were called from | |
982 | elf64_x86_64_check_relocs. We only want to check the new | |
983 | transition which hasn't been checked before. */ | |
984 | check = new_to_type != to_type && from_type == to_type; | |
985 | to_type = new_to_type; | |
986 | } | |
987 | ||
988 | break; | |
989 | ||
990 | case R_X86_64_TLSLD: | |
991 | if (!info->shared) | |
992 | to_type = R_X86_64_TPOFF32; | |
993 | break; | |
994 | ||
995 | default: | |
996 | return TRUE; | |
997 | } | |
998 | ||
999 | /* Return TRUE if there is no transition. */ | |
1000 | if (from_type == to_type) | |
1001 | return TRUE; | |
1002 | ||
1003 | /* Check if the transition can be performed. */ | |
1004 | if (check | |
1005 | && ! elf64_x86_64_check_tls_transition (abfd, sec, contents, | |
1006 | symtab_hdr, sym_hashes, | |
1007 | from_type, rel, relend)) | |
1008 | { | |
1009 | reloc_howto_type *from, *to; | |
1010 | ||
1011 | from = elf64_x86_64_rtype_to_howto (abfd, from_type); | |
1012 | to = elf64_x86_64_rtype_to_howto (abfd, to_type); | |
1013 | ||
1014 | (*_bfd_error_handler) | |
1015 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " | |
1016 | "in section `%A' failed"), | |
1017 | abfd, sec, from->name, to->name, | |
1018 | h ? h->root.root.string : "a local symbol", | |
1019 | (unsigned long) rel->r_offset); | |
1020 | bfd_set_error (bfd_error_bad_value); | |
1021 | return FALSE; | |
1022 | } | |
1023 | ||
1024 | *r_type = to_type; | |
1025 | return TRUE; | |
1026 | } | |
1027 | ||
1028 | /* Look through the relocs for a section during the first phase, and | |
1029 | calculate needed space in the global offset table, procedure | |
1030 | linkage table, and dynamic reloc sections. */ | |
1031 | ||
1032 | static bfd_boolean | |
1033 | elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, | |
1034 | asection *sec, | |
1035 | const Elf_Internal_Rela *relocs) | |
1036 | { | |
1037 | struct elf64_x86_64_link_hash_table *htab; | |
1038 | Elf_Internal_Shdr *symtab_hdr; | |
1039 | struct elf_link_hash_entry **sym_hashes; | |
1040 | const Elf_Internal_Rela *rel; | |
1041 | const Elf_Internal_Rela *rel_end; | |
1042 | asection *sreloc; | |
1043 | ||
1044 | if (info->relocatable) | |
1045 | return TRUE; | |
1046 | ||
1047 | BFD_ASSERT (is_x86_64_elf (abfd)); | |
1048 | ||
1049 | htab = elf64_x86_64_hash_table (info); | |
1050 | symtab_hdr = &elf_symtab_hdr (abfd); | |
1051 | sym_hashes = elf_sym_hashes (abfd); | |
1052 | ||
1053 | sreloc = NULL; | |
1054 | ||
1055 | rel_end = relocs + sec->reloc_count; | |
1056 | for (rel = relocs; rel < rel_end; rel++) | |
1057 | { | |
1058 | unsigned int r_type; | |
1059 | unsigned long r_symndx; | |
1060 | struct elf_link_hash_entry *h; | |
1061 | ||
1062 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1063 | r_type = ELF64_R_TYPE (rel->r_info); | |
1064 | ||
1065 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
1066 | { | |
1067 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), | |
1068 | abfd, r_symndx); | |
1069 | return FALSE; | |
1070 | } | |
1071 | ||
1072 | if (r_symndx < symtab_hdr->sh_info) | |
1073 | { | |
1074 | /* A local symbol. */ | |
1075 | Elf_Internal_Sym *isym; | |
1076 | ||
1077 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1078 | abfd, r_symndx); | |
1079 | if (isym == NULL) | |
1080 | return FALSE; | |
1081 | ||
1082 | /* Check relocation against local STT_GNU_IFUNC symbol. */ | |
1083 | if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
1084 | { | |
1085 | h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel, | |
1086 | TRUE); | |
1087 | if (h == NULL) | |
1088 | return FALSE; | |
1089 | ||
1090 | /* Fake a STT_GNU_IFUNC symbol. */ | |
1091 | h->type = STT_GNU_IFUNC; | |
1092 | h->def_regular = 1; | |
1093 | h->ref_regular = 1; | |
1094 | h->forced_local = 1; | |
1095 | h->root.type = bfd_link_hash_defined; | |
1096 | } | |
1097 | else | |
1098 | h = NULL; | |
1099 | } | |
1100 | else | |
1101 | { | |
1102 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1103 | while (h->root.type == bfd_link_hash_indirect | |
1104 | || h->root.type == bfd_link_hash_warning) | |
1105 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1106 | } | |
1107 | ||
1108 | if (h != NULL) | |
1109 | { | |
1110 | /* Create the ifunc sections for static executables. If we | |
1111 | never see an indirect function symbol nor we are building | |
1112 | a static executable, those sections will be empty and | |
1113 | won't appear in output. */ | |
1114 | switch (r_type) | |
1115 | { | |
1116 | default: | |
1117 | break; | |
1118 | ||
1119 | case R_X86_64_32S: | |
1120 | case R_X86_64_32: | |
1121 | case R_X86_64_64: | |
1122 | case R_X86_64_PC32: | |
1123 | case R_X86_64_PC64: | |
1124 | case R_X86_64_PLT32: | |
1125 | case R_X86_64_GOTPCREL: | |
1126 | case R_X86_64_GOTPCREL64: | |
1127 | if (!_bfd_elf_create_ifunc_sections (abfd, info)) | |
1128 | return FALSE; | |
1129 | break; | |
1130 | } | |
1131 | ||
1132 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle | |
1133 | it here if it is defined in a non-shared object. */ | |
1134 | if (h->type == STT_GNU_IFUNC | |
1135 | && h->def_regular) | |
1136 | { | |
1137 | /* It is referenced by a non-shared object. */ | |
1138 | h->ref_regular = 1; | |
1139 | ||
1140 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
1141 | h->plt.refcount += 1; | |
1142 | ||
1143 | /* STT_GNU_IFUNC needs dynamic sections. */ | |
1144 | if (htab->elf.dynobj == NULL) | |
1145 | htab->elf.dynobj = abfd; | |
1146 | ||
1147 | switch (r_type) | |
1148 | { | |
1149 | default: | |
1150 | (*_bfd_error_handler) | |
1151 | (_("%B: relocation %s against STT_GNU_IFUNC " | |
1152 | "symbol `%s' isn't handled by %s"), abfd, | |
1153 | x86_64_elf_howto_table[r_type].name, | |
1154 | (h->root.root.string | |
1155 | ? h->root.root.string : "a local symbol"), | |
1156 | __FUNCTION__); | |
1157 | bfd_set_error (bfd_error_bad_value); | |
1158 | return FALSE; | |
1159 | ||
1160 | case R_X86_64_64: | |
1161 | h->non_got_ref = 1; | |
1162 | h->pointer_equality_needed = 1; | |
1163 | if (info->shared) | |
1164 | { | |
1165 | /* We must copy these reloc types into the output | |
1166 | file. Create a reloc section in dynobj and | |
1167 | make room for this reloc. */ | |
1168 | sreloc = _bfd_elf_create_ifunc_dyn_reloc | |
1169 | (abfd, info, sec, sreloc, | |
1170 | &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs); | |
1171 | if (sreloc == NULL) | |
1172 | return FALSE; | |
1173 | } | |
1174 | break; | |
1175 | ||
1176 | case R_X86_64_32S: | |
1177 | case R_X86_64_32: | |
1178 | case R_X86_64_PC32: | |
1179 | case R_X86_64_PC64: | |
1180 | h->non_got_ref = 1; | |
1181 | if (r_type != R_X86_64_PC32 | |
1182 | && r_type != R_X86_64_PC64) | |
1183 | h->pointer_equality_needed = 1; | |
1184 | break; | |
1185 | ||
1186 | case R_X86_64_PLT32: | |
1187 | break; | |
1188 | ||
1189 | case R_X86_64_GOTPCREL: | |
1190 | case R_X86_64_GOTPCREL64: | |
1191 | h->got.refcount += 1; | |
1192 | if (htab->elf.sgot == NULL | |
1193 | && !_bfd_elf_create_got_section (htab->elf.dynobj, | |
1194 | info)) | |
1195 | return FALSE; | |
1196 | break; | |
1197 | } | |
1198 | ||
1199 | continue; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL, | |
1204 | symtab_hdr, sym_hashes, | |
1205 | &r_type, GOT_UNKNOWN, | |
1206 | rel, rel_end, h)) | |
1207 | return FALSE; | |
1208 | ||
1209 | switch (r_type) | |
1210 | { | |
1211 | case R_X86_64_TLSLD: | |
1212 | htab->tls_ld_got.refcount += 1; | |
1213 | goto create_got; | |
1214 | ||
1215 | case R_X86_64_TPOFF32: | |
1216 | if (info->shared) | |
1217 | { | |
1218 | (*_bfd_error_handler) | |
1219 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), | |
1220 | abfd, | |
1221 | x86_64_elf_howto_table[r_type].name, | |
1222 | (h) ? h->root.root.string : "a local symbol"); | |
1223 | bfd_set_error (bfd_error_bad_value); | |
1224 | return FALSE; | |
1225 | } | |
1226 | break; | |
1227 | ||
1228 | case R_X86_64_GOTTPOFF: | |
1229 | if (info->shared) | |
1230 | info->flags |= DF_STATIC_TLS; | |
1231 | /* Fall through */ | |
1232 | ||
1233 | case R_X86_64_GOT32: | |
1234 | case R_X86_64_GOTPCREL: | |
1235 | case R_X86_64_TLSGD: | |
1236 | case R_X86_64_GOT64: | |
1237 | case R_X86_64_GOTPCREL64: | |
1238 | case R_X86_64_GOTPLT64: | |
1239 | case R_X86_64_GOTPC32_TLSDESC: | |
1240 | case R_X86_64_TLSDESC_CALL: | |
1241 | /* This symbol requires a global offset table entry. */ | |
1242 | { | |
1243 | int tls_type, old_tls_type; | |
1244 | ||
1245 | switch (r_type) | |
1246 | { | |
1247 | default: tls_type = GOT_NORMAL; break; | |
1248 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; | |
1249 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; | |
1250 | case R_X86_64_GOTPC32_TLSDESC: | |
1251 | case R_X86_64_TLSDESC_CALL: | |
1252 | tls_type = GOT_TLS_GDESC; break; | |
1253 | } | |
1254 | ||
1255 | if (h != NULL) | |
1256 | { | |
1257 | if (r_type == R_X86_64_GOTPLT64) | |
1258 | { | |
1259 | /* This relocation indicates that we also need | |
1260 | a PLT entry, as this is a function. We don't need | |
1261 | a PLT entry for local symbols. */ | |
1262 | h->needs_plt = 1; | |
1263 | h->plt.refcount += 1; | |
1264 | } | |
1265 | h->got.refcount += 1; | |
1266 | old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; | |
1267 | } | |
1268 | else | |
1269 | { | |
1270 | bfd_signed_vma *local_got_refcounts; | |
1271 | ||
1272 | /* This is a global offset table entry for a local symbol. */ | |
1273 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
1274 | if (local_got_refcounts == NULL) | |
1275 | { | |
1276 | bfd_size_type size; | |
1277 | ||
1278 | size = symtab_hdr->sh_info; | |
1279 | size *= sizeof (bfd_signed_vma) | |
1280 | + sizeof (bfd_vma) + sizeof (char); | |
1281 | local_got_refcounts = ((bfd_signed_vma *) | |
1282 | bfd_zalloc (abfd, size)); | |
1283 | if (local_got_refcounts == NULL) | |
1284 | return FALSE; | |
1285 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
1286 | elf64_x86_64_local_tlsdesc_gotent (abfd) | |
1287 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); | |
1288 | elf64_x86_64_local_got_tls_type (abfd) | |
1289 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); | |
1290 | } | |
1291 | local_got_refcounts[r_symndx] += 1; | |
1292 | old_tls_type | |
1293 | = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; | |
1294 | } | |
1295 | ||
1296 | /* If a TLS symbol is accessed using IE at least once, | |
1297 | there is no point to use dynamic model for it. */ | |
1298 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN | |
1299 | && (! GOT_TLS_GD_ANY_P (old_tls_type) | |
1300 | || tls_type != GOT_TLS_IE)) | |
1301 | { | |
1302 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) | |
1303 | tls_type = old_tls_type; | |
1304 | else if (GOT_TLS_GD_ANY_P (old_tls_type) | |
1305 | && GOT_TLS_GD_ANY_P (tls_type)) | |
1306 | tls_type |= old_tls_type; | |
1307 | else | |
1308 | { | |
1309 | (*_bfd_error_handler) | |
1310 | (_("%B: '%s' accessed both as normal and thread local symbol"), | |
1311 | abfd, h ? h->root.root.string : "<local>"); | |
1312 | return FALSE; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | if (old_tls_type != tls_type) | |
1317 | { | |
1318 | if (h != NULL) | |
1319 | elf64_x86_64_hash_entry (h)->tls_type = tls_type; | |
1320 | else | |
1321 | elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; | |
1322 | } | |
1323 | } | |
1324 | /* Fall through */ | |
1325 | ||
1326 | case R_X86_64_GOTOFF64: | |
1327 | case R_X86_64_GOTPC32: | |
1328 | case R_X86_64_GOTPC64: | |
1329 | create_got: | |
1330 | if (htab->elf.sgot == NULL) | |
1331 | { | |
1332 | if (htab->elf.dynobj == NULL) | |
1333 | htab->elf.dynobj = abfd; | |
1334 | if (!_bfd_elf_create_got_section (htab->elf.dynobj, | |
1335 | info)) | |
1336 | return FALSE; | |
1337 | } | |
1338 | break; | |
1339 | ||
1340 | case R_X86_64_PLT32: | |
1341 | /* This symbol requires a procedure linkage table entry. We | |
1342 | actually build the entry in adjust_dynamic_symbol, | |
1343 | because this might be a case of linking PIC code which is | |
1344 | never referenced by a dynamic object, in which case we | |
1345 | don't need to generate a procedure linkage table entry | |
1346 | after all. */ | |
1347 | ||
1348 | /* If this is a local symbol, we resolve it directly without | |
1349 | creating a procedure linkage table entry. */ | |
1350 | if (h == NULL) | |
1351 | continue; | |
1352 | ||
1353 | h->needs_plt = 1; | |
1354 | h->plt.refcount += 1; | |
1355 | break; | |
1356 | ||
1357 | case R_X86_64_PLTOFF64: | |
1358 | /* This tries to form the 'address' of a function relative | |
1359 | to GOT. For global symbols we need a PLT entry. */ | |
1360 | if (h != NULL) | |
1361 | { | |
1362 | h->needs_plt = 1; | |
1363 | h->plt.refcount += 1; | |
1364 | } | |
1365 | goto create_got; | |
1366 | ||
1367 | case R_X86_64_8: | |
1368 | case R_X86_64_16: | |
1369 | case R_X86_64_32: | |
1370 | case R_X86_64_32S: | |
1371 | /* Let's help debug shared library creation. These relocs | |
1372 | cannot be used in shared libs. Don't error out for | |
1373 | sections we don't care about, such as debug sections or | |
1374 | non-constant sections. */ | |
1375 | if (info->shared | |
1376 | && (sec->flags & SEC_ALLOC) != 0 | |
1377 | && (sec->flags & SEC_READONLY) != 0) | |
1378 | { | |
1379 | (*_bfd_error_handler) | |
1380 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), | |
1381 | abfd, | |
1382 | x86_64_elf_howto_table[r_type].name, | |
1383 | (h) ? h->root.root.string : "a local symbol"); | |
1384 | bfd_set_error (bfd_error_bad_value); | |
1385 | return FALSE; | |
1386 | } | |
1387 | /* Fall through. */ | |
1388 | ||
1389 | case R_X86_64_PC8: | |
1390 | case R_X86_64_PC16: | |
1391 | case R_X86_64_PC32: | |
1392 | case R_X86_64_PC64: | |
1393 | case R_X86_64_64: | |
1394 | if (h != NULL && info->executable) | |
1395 | { | |
1396 | /* If this reloc is in a read-only section, we might | |
1397 | need a copy reloc. We can't check reliably at this | |
1398 | stage whether the section is read-only, as input | |
1399 | sections have not yet been mapped to output sections. | |
1400 | Tentatively set the flag for now, and correct in | |
1401 | adjust_dynamic_symbol. */ | |
1402 | h->non_got_ref = 1; | |
1403 | ||
1404 | /* We may need a .plt entry if the function this reloc | |
1405 | refers to is in a shared lib. */ | |
1406 | h->plt.refcount += 1; | |
1407 | if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) | |
1408 | h->pointer_equality_needed = 1; | |
1409 | } | |
1410 | ||
1411 | /* If we are creating a shared library, and this is a reloc | |
1412 | against a global symbol, or a non PC relative reloc | |
1413 | against a local symbol, then we need to copy the reloc | |
1414 | into the shared library. However, if we are linking with | |
1415 | -Bsymbolic, we do not need to copy a reloc against a | |
1416 | global symbol which is defined in an object we are | |
1417 | including in the link (i.e., DEF_REGULAR is set). At | |
1418 | this point we have not seen all the input files, so it is | |
1419 | possible that DEF_REGULAR is not set now but will be set | |
1420 | later (it is never cleared). In case of a weak definition, | |
1421 | DEF_REGULAR may be cleared later by a strong definition in | |
1422 | a shared library. We account for that possibility below by | |
1423 | storing information in the relocs_copied field of the hash | |
1424 | table entry. A similar situation occurs when creating | |
1425 | shared libraries and symbol visibility changes render the | |
1426 | symbol local. | |
1427 | ||
1428 | If on the other hand, we are creating an executable, we | |
1429 | may need to keep relocations for symbols satisfied by a | |
1430 | dynamic library if we manage to avoid copy relocs for the | |
1431 | symbol. */ | |
1432 | if ((info->shared | |
1433 | && (sec->flags & SEC_ALLOC) != 0 | |
1434 | && (! IS_X86_64_PCREL_TYPE (r_type) | |
1435 | || (h != NULL | |
1436 | && (! SYMBOLIC_BIND (info, h) | |
1437 | || h->root.type == bfd_link_hash_defweak | |
1438 | || !h->def_regular)))) | |
1439 | || (ELIMINATE_COPY_RELOCS | |
1440 | && !info->shared | |
1441 | && (sec->flags & SEC_ALLOC) != 0 | |
1442 | && h != NULL | |
1443 | && (h->root.type == bfd_link_hash_defweak | |
1444 | || !h->def_regular))) | |
1445 | { | |
1446 | struct elf_dyn_relocs *p; | |
1447 | struct elf_dyn_relocs **head; | |
1448 | ||
1449 | /* We must copy these reloc types into the output file. | |
1450 | Create a reloc section in dynobj and make room for | |
1451 | this reloc. */ | |
1452 | if (sreloc == NULL) | |
1453 | { | |
1454 | if (htab->elf.dynobj == NULL) | |
1455 | htab->elf.dynobj = abfd; | |
1456 | ||
1457 | sreloc = _bfd_elf_make_dynamic_reloc_section | |
1458 | (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE); | |
1459 | ||
1460 | if (sreloc == NULL) | |
1461 | return FALSE; | |
1462 | } | |
1463 | ||
1464 | /* If this is a global symbol, we count the number of | |
1465 | relocations we need for this symbol. */ | |
1466 | if (h != NULL) | |
1467 | { | |
1468 | head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; | |
1469 | } | |
1470 | else | |
1471 | { | |
1472 | /* Track dynamic relocs needed for local syms too. | |
1473 | We really need local syms available to do this | |
1474 | easily. Oh well. */ | |
1475 | asection *s; | |
1476 | void **vpp; | |
1477 | Elf_Internal_Sym *isym; | |
1478 | ||
1479 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1480 | abfd, r_symndx); | |
1481 | if (isym == NULL) | |
1482 | return FALSE; | |
1483 | ||
1484 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1485 | if (s == NULL) | |
1486 | s = sec; | |
1487 | ||
1488 | /* Beware of type punned pointers vs strict aliasing | |
1489 | rules. */ | |
1490 | vpp = &(elf_section_data (s)->local_dynrel); | |
1491 | head = (struct elf_dyn_relocs **)vpp; | |
1492 | } | |
1493 | ||
1494 | p = *head; | |
1495 | if (p == NULL || p->sec != sec) | |
1496 | { | |
1497 | bfd_size_type amt = sizeof *p; | |
1498 | ||
1499 | p = ((struct elf_dyn_relocs *) | |
1500 | bfd_alloc (htab->elf.dynobj, amt)); | |
1501 | if (p == NULL) | |
1502 | return FALSE; | |
1503 | p->next = *head; | |
1504 | *head = p; | |
1505 | p->sec = sec; | |
1506 | p->count = 0; | |
1507 | p->pc_count = 0; | |
1508 | } | |
1509 | ||
1510 | p->count += 1; | |
1511 | if (IS_X86_64_PCREL_TYPE (r_type)) | |
1512 | p->pc_count += 1; | |
1513 | } | |
1514 | break; | |
1515 | ||
1516 | /* This relocation describes the C++ object vtable hierarchy. | |
1517 | Reconstruct it for later use during GC. */ | |
1518 | case R_X86_64_GNU_VTINHERIT: | |
1519 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
1520 | return FALSE; | |
1521 | break; | |
1522 | ||
1523 | /* This relocation describes which C++ vtable entries are actually | |
1524 | used. Record for later use during GC. */ | |
1525 | case R_X86_64_GNU_VTENTRY: | |
1526 | BFD_ASSERT (h != NULL); | |
1527 | if (h != NULL | |
1528 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
1529 | return FALSE; | |
1530 | break; | |
1531 | ||
1532 | default: | |
1533 | break; | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | return TRUE; | |
1538 | } | |
1539 | ||
1540 | /* Return the section that should be marked against GC for a given | |
1541 | relocation. */ | |
1542 | ||
1543 | static asection * | |
1544 | elf64_x86_64_gc_mark_hook (asection *sec, | |
1545 | struct bfd_link_info *info, | |
1546 | Elf_Internal_Rela *rel, | |
1547 | struct elf_link_hash_entry *h, | |
1548 | Elf_Internal_Sym *sym) | |
1549 | { | |
1550 | if (h != NULL) | |
1551 | switch (ELF64_R_TYPE (rel->r_info)) | |
1552 | { | |
1553 | case R_X86_64_GNU_VTINHERIT: | |
1554 | case R_X86_64_GNU_VTENTRY: | |
1555 | return NULL; | |
1556 | } | |
1557 | ||
1558 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
1559 | } | |
1560 | ||
1561 | /* Update the got entry reference counts for the section being removed. */ | |
1562 | ||
1563 | static bfd_boolean | |
1564 | elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, | |
1565 | asection *sec, | |
1566 | const Elf_Internal_Rela *relocs) | |
1567 | { | |
1568 | Elf_Internal_Shdr *symtab_hdr; | |
1569 | struct elf_link_hash_entry **sym_hashes; | |
1570 | bfd_signed_vma *local_got_refcounts; | |
1571 | const Elf_Internal_Rela *rel, *relend; | |
1572 | ||
1573 | if (info->relocatable) | |
1574 | return TRUE; | |
1575 | ||
1576 | elf_section_data (sec)->local_dynrel = NULL; | |
1577 | ||
1578 | symtab_hdr = &elf_symtab_hdr (abfd); | |
1579 | sym_hashes = elf_sym_hashes (abfd); | |
1580 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
1581 | ||
1582 | relend = relocs + sec->reloc_count; | |
1583 | for (rel = relocs; rel < relend; rel++) | |
1584 | { | |
1585 | unsigned long r_symndx; | |
1586 | unsigned int r_type; | |
1587 | struct elf_link_hash_entry *h = NULL; | |
1588 | ||
1589 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1590 | if (r_symndx >= symtab_hdr->sh_info) | |
1591 | { | |
1592 | struct elf64_x86_64_link_hash_entry *eh; | |
1593 | struct elf_dyn_relocs **pp; | |
1594 | struct elf_dyn_relocs *p; | |
1595 | ||
1596 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1597 | while (h->root.type == bfd_link_hash_indirect | |
1598 | || h->root.type == bfd_link_hash_warning) | |
1599 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1600 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
1601 | ||
1602 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) | |
1603 | if (p->sec == sec) | |
1604 | { | |
1605 | /* Everything must go for SEC. */ | |
1606 | *pp = p->next; | |
1607 | break; | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | r_type = ELF64_R_TYPE (rel->r_info); | |
1612 | if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL, | |
1613 | symtab_hdr, sym_hashes, | |
1614 | &r_type, GOT_UNKNOWN, | |
1615 | rel, relend, h)) | |
1616 | return FALSE; | |
1617 | ||
1618 | switch (r_type) | |
1619 | { | |
1620 | case R_X86_64_TLSLD: | |
1621 | if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) | |
1622 | elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; | |
1623 | break; | |
1624 | ||
1625 | case R_X86_64_TLSGD: | |
1626 | case R_X86_64_GOTPC32_TLSDESC: | |
1627 | case R_X86_64_TLSDESC_CALL: | |
1628 | case R_X86_64_GOTTPOFF: | |
1629 | case R_X86_64_GOT32: | |
1630 | case R_X86_64_GOTPCREL: | |
1631 | case R_X86_64_GOT64: | |
1632 | case R_X86_64_GOTPCREL64: | |
1633 | case R_X86_64_GOTPLT64: | |
1634 | if (h != NULL) | |
1635 | { | |
1636 | if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) | |
1637 | h->plt.refcount -= 1; | |
1638 | if (h->got.refcount > 0) | |
1639 | h->got.refcount -= 1; | |
1640 | } | |
1641 | else if (local_got_refcounts != NULL) | |
1642 | { | |
1643 | if (local_got_refcounts[r_symndx] > 0) | |
1644 | local_got_refcounts[r_symndx] -= 1; | |
1645 | } | |
1646 | break; | |
1647 | ||
1648 | case R_X86_64_8: | |
1649 | case R_X86_64_16: | |
1650 | case R_X86_64_32: | |
1651 | case R_X86_64_64: | |
1652 | case R_X86_64_32S: | |
1653 | case R_X86_64_PC8: | |
1654 | case R_X86_64_PC16: | |
1655 | case R_X86_64_PC32: | |
1656 | case R_X86_64_PC64: | |
1657 | if (info->shared) | |
1658 | break; | |
1659 | /* Fall thru */ | |
1660 | ||
1661 | case R_X86_64_PLT32: | |
1662 | case R_X86_64_PLTOFF64: | |
1663 | if (h != NULL) | |
1664 | { | |
1665 | if (h->plt.refcount > 0) | |
1666 | h->plt.refcount -= 1; | |
1667 | } | |
1668 | break; | |
1669 | ||
1670 | default: | |
1671 | break; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | return TRUE; | |
1676 | } | |
1677 | ||
1678 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
1679 | regular object. The current definition is in some section of the | |
1680 | dynamic object, but we're not including those sections. We have to | |
1681 | change the definition to something the rest of the link can | |
1682 | understand. */ | |
1683 | ||
1684 | static bfd_boolean | |
1685 | elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, | |
1686 | struct elf_link_hash_entry *h) | |
1687 | { | |
1688 | struct elf64_x86_64_link_hash_table *htab; | |
1689 | asection *s; | |
1690 | ||
1691 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
1692 | if (h->type == STT_GNU_IFUNC) | |
1693 | { | |
1694 | if (h->plt.refcount <= 0) | |
1695 | { | |
1696 | h->plt.offset = (bfd_vma) -1; | |
1697 | h->needs_plt = 0; | |
1698 | } | |
1699 | return TRUE; | |
1700 | } | |
1701 | ||
1702 | /* If this is a function, put it in the procedure linkage table. We | |
1703 | will fill in the contents of the procedure linkage table later, | |
1704 | when we know the address of the .got section. */ | |
1705 | if (h->type == STT_FUNC | |
1706 | || h->needs_plt) | |
1707 | { | |
1708 | if (h->plt.refcount <= 0 | |
1709 | || SYMBOL_CALLS_LOCAL (info, h) | |
1710 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1711 | && h->root.type == bfd_link_hash_undefweak)) | |
1712 | { | |
1713 | /* This case can occur if we saw a PLT32 reloc in an input | |
1714 | file, but the symbol was never referred to by a dynamic | |
1715 | object, or if all references were garbage collected. In | |
1716 | such a case, we don't actually need to build a procedure | |
1717 | linkage table, and we can just do a PC32 reloc instead. */ | |
1718 | h->plt.offset = (bfd_vma) -1; | |
1719 | h->needs_plt = 0; | |
1720 | } | |
1721 | ||
1722 | return TRUE; | |
1723 | } | |
1724 | else | |
1725 | /* It's possible that we incorrectly decided a .plt reloc was | |
1726 | needed for an R_X86_64_PC32 reloc to a non-function sym in | |
1727 | check_relocs. We can't decide accurately between function and | |
1728 | non-function syms in check-relocs; Objects loaded later in | |
1729 | the link may change h->type. So fix it now. */ | |
1730 | h->plt.offset = (bfd_vma) -1; | |
1731 | ||
1732 | /* If this is a weak symbol, and there is a real definition, the | |
1733 | processor independent code will have arranged for us to see the | |
1734 | real definition first, and we can just use the same value. */ | |
1735 | if (h->u.weakdef != NULL) | |
1736 | { | |
1737 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined | |
1738 | || h->u.weakdef->root.type == bfd_link_hash_defweak); | |
1739 | h->root.u.def.section = h->u.weakdef->root.u.def.section; | |
1740 | h->root.u.def.value = h->u.weakdef->root.u.def.value; | |
1741 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) | |
1742 | h->non_got_ref = h->u.weakdef->non_got_ref; | |
1743 | return TRUE; | |
1744 | } | |
1745 | ||
1746 | /* This is a reference to a symbol defined by a dynamic object which | |
1747 | is not a function. */ | |
1748 | ||
1749 | /* If we are creating a shared library, we must presume that the | |
1750 | only references to the symbol are via the global offset table. | |
1751 | For such cases we need not do anything here; the relocations will | |
1752 | be handled correctly by relocate_section. */ | |
1753 | if (info->shared) | |
1754 | return TRUE; | |
1755 | ||
1756 | /* If there are no references to this symbol that do not use the | |
1757 | GOT, we don't need to generate a copy reloc. */ | |
1758 | if (!h->non_got_ref) | |
1759 | return TRUE; | |
1760 | ||
1761 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1762 | if (info->nocopyreloc) | |
1763 | { | |
1764 | h->non_got_ref = 0; | |
1765 | return TRUE; | |
1766 | } | |
1767 | ||
1768 | if (ELIMINATE_COPY_RELOCS) | |
1769 | { | |
1770 | struct elf64_x86_64_link_hash_entry * eh; | |
1771 | struct elf_dyn_relocs *p; | |
1772 | ||
1773 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
1774 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1775 | { | |
1776 | s = p->sec->output_section; | |
1777 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1778 | break; | |
1779 | } | |
1780 | ||
1781 | /* If we didn't find any dynamic relocs in read-only sections, then | |
1782 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ | |
1783 | if (p == NULL) | |
1784 | { | |
1785 | h->non_got_ref = 0; | |
1786 | return TRUE; | |
1787 | } | |
1788 | } | |
1789 | ||
1790 | if (h->size == 0) | |
1791 | { | |
1792 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), | |
1793 | h->root.root.string); | |
1794 | return TRUE; | |
1795 | } | |
1796 | ||
1797 | /* We must allocate the symbol in our .dynbss section, which will | |
1798 | become part of the .bss section of the executable. There will be | |
1799 | an entry for this symbol in the .dynsym section. The dynamic | |
1800 | object will contain position independent code, so all references | |
1801 | from the dynamic object to this symbol will go through the global | |
1802 | offset table. The dynamic linker will use the .dynsym entry to | |
1803 | determine the address it must put in the global offset table, so | |
1804 | both the dynamic object and the regular object will refer to the | |
1805 | same memory location for the variable. */ | |
1806 | ||
1807 | htab = elf64_x86_64_hash_table (info); | |
1808 | ||
1809 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker | |
1810 | to copy the initial value out of the dynamic object and into the | |
1811 | runtime process image. */ | |
1812 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
1813 | { | |
1814 | htab->srelbss->size += sizeof (Elf64_External_Rela); | |
1815 | h->needs_copy = 1; | |
1816 | } | |
1817 | ||
1818 | s = htab->sdynbss; | |
1819 | ||
1820 | return _bfd_elf_adjust_dynamic_copy (h, s); | |
1821 | } | |
1822 | ||
1823 | /* Allocate space in .plt, .got and associated reloc sections for | |
1824 | dynamic relocs. */ | |
1825 | ||
1826 | static bfd_boolean | |
1827 | elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) | |
1828 | { | |
1829 | struct bfd_link_info *info; | |
1830 | struct elf64_x86_64_link_hash_table *htab; | |
1831 | struct elf64_x86_64_link_hash_entry *eh; | |
1832 | struct elf_dyn_relocs *p; | |
1833 | ||
1834 | if (h->root.type == bfd_link_hash_indirect) | |
1835 | return TRUE; | |
1836 | ||
1837 | if (h->root.type == bfd_link_hash_warning) | |
1838 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1839 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
1840 | ||
1841 | info = (struct bfd_link_info *) inf; | |
1842 | htab = elf64_x86_64_hash_table (info); | |
1843 | ||
1844 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
1845 | here if it is defined and referenced in a non-shared object. */ | |
1846 | if (h->type == STT_GNU_IFUNC | |
1847 | && h->def_regular) | |
1848 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, | |
1849 | &eh->dyn_relocs, | |
1850 | PLT_ENTRY_SIZE, | |
1851 | GOT_ENTRY_SIZE); | |
1852 | else if (htab->elf.dynamic_sections_created | |
1853 | && h->plt.refcount > 0) | |
1854 | { | |
1855 | /* Make sure this symbol is output as a dynamic symbol. | |
1856 | Undefined weak syms won't yet be marked as dynamic. */ | |
1857 | if (h->dynindx == -1 | |
1858 | && !h->forced_local) | |
1859 | { | |
1860 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
1861 | return FALSE; | |
1862 | } | |
1863 | ||
1864 | if (info->shared | |
1865 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) | |
1866 | { | |
1867 | asection *s = htab->elf.splt; | |
1868 | ||
1869 | /* If this is the first .plt entry, make room for the special | |
1870 | first entry. */ | |
1871 | if (s->size == 0) | |
1872 | s->size += PLT_ENTRY_SIZE; | |
1873 | ||
1874 | h->plt.offset = s->size; | |
1875 | ||
1876 | /* If this symbol is not defined in a regular file, and we are | |
1877 | not generating a shared library, then set the symbol to this | |
1878 | location in the .plt. This is required to make function | |
1879 | pointers compare as equal between the normal executable and | |
1880 | the shared library. */ | |
1881 | if (! info->shared | |
1882 | && !h->def_regular) | |
1883 | { | |
1884 | h->root.u.def.section = s; | |
1885 | h->root.u.def.value = h->plt.offset; | |
1886 | } | |
1887 | ||
1888 | /* Make room for this entry. */ | |
1889 | s->size += PLT_ENTRY_SIZE; | |
1890 | ||
1891 | /* We also need to make an entry in the .got.plt section, which | |
1892 | will be placed in the .got section by the linker script. */ | |
1893 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; | |
1894 | ||
1895 | /* We also need to make an entry in the .rela.plt section. */ | |
1896 | htab->elf.srelplt->size += sizeof (Elf64_External_Rela); | |
1897 | htab->elf.srelplt->reloc_count++; | |
1898 | } | |
1899 | else | |
1900 | { | |
1901 | h->plt.offset = (bfd_vma) -1; | |
1902 | h->needs_plt = 0; | |
1903 | } | |
1904 | } | |
1905 | else | |
1906 | { | |
1907 | h->plt.offset = (bfd_vma) -1; | |
1908 | h->needs_plt = 0; | |
1909 | } | |
1910 | ||
1911 | eh->tlsdesc_got = (bfd_vma) -1; | |
1912 | ||
1913 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, | |
1914 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ | |
1915 | if (h->got.refcount > 0 | |
1916 | && !info->shared | |
1917 | && h->dynindx == -1 | |
1918 | && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) | |
1919 | { | |
1920 | h->got.offset = (bfd_vma) -1; | |
1921 | } | |
1922 | else if (h->got.refcount > 0) | |
1923 | { | |
1924 | asection *s; | |
1925 | bfd_boolean dyn; | |
1926 | int tls_type = elf64_x86_64_hash_entry (h)->tls_type; | |
1927 | ||
1928 | /* Make sure this symbol is output as a dynamic symbol. | |
1929 | Undefined weak syms won't yet be marked as dynamic. */ | |
1930 | if (h->dynindx == -1 | |
1931 | && !h->forced_local) | |
1932 | { | |
1933 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
1934 | return FALSE; | |
1935 | } | |
1936 | ||
1937 | if (GOT_TLS_GDESC_P (tls_type)) | |
1938 | { | |
1939 | eh->tlsdesc_got = htab->elf.sgotplt->size | |
1940 | - elf64_x86_64_compute_jump_table_size (htab); | |
1941 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; | |
1942 | h->got.offset = (bfd_vma) -2; | |
1943 | } | |
1944 | if (! GOT_TLS_GDESC_P (tls_type) | |
1945 | || GOT_TLS_GD_P (tls_type)) | |
1946 | { | |
1947 | s = htab->elf.sgot; | |
1948 | h->got.offset = s->size; | |
1949 | s->size += GOT_ENTRY_SIZE; | |
1950 | if (GOT_TLS_GD_P (tls_type)) | |
1951 | s->size += GOT_ENTRY_SIZE; | |
1952 | } | |
1953 | dyn = htab->elf.dynamic_sections_created; | |
1954 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol | |
1955 | and two if global. | |
1956 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ | |
1957 | if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) | |
1958 | || tls_type == GOT_TLS_IE) | |
1959 | htab->elf.srelgot->size += sizeof (Elf64_External_Rela); | |
1960 | else if (GOT_TLS_GD_P (tls_type)) | |
1961 | htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela); | |
1962 | else if (! GOT_TLS_GDESC_P (tls_type) | |
1963 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
1964 | || h->root.type != bfd_link_hash_undefweak) | |
1965 | && (info->shared | |
1966 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) | |
1967 | htab->elf.srelgot->size += sizeof (Elf64_External_Rela); | |
1968 | if (GOT_TLS_GDESC_P (tls_type)) | |
1969 | { | |
1970 | htab->elf.srelplt->size += sizeof (Elf64_External_Rela); | |
1971 | htab->tlsdesc_plt = (bfd_vma) -1; | |
1972 | } | |
1973 | } | |
1974 | else | |
1975 | h->got.offset = (bfd_vma) -1; | |
1976 | ||
1977 | if (eh->dyn_relocs == NULL) | |
1978 | return TRUE; | |
1979 | ||
1980 | /* In the shared -Bsymbolic case, discard space allocated for | |
1981 | dynamic pc-relative relocs against symbols which turn out to be | |
1982 | defined in regular objects. For the normal shared case, discard | |
1983 | space for pc-relative relocs that have become local due to symbol | |
1984 | visibility changes. */ | |
1985 | ||
1986 | if (info->shared) | |
1987 | { | |
1988 | /* Relocs that use pc_count are those that appear on a call | |
1989 | insn, or certain REL relocs that can generated via assembly. | |
1990 | We want calls to protected symbols to resolve directly to the | |
1991 | function rather than going via the plt. If people want | |
1992 | function pointer comparisons to work as expected then they | |
1993 | should avoid writing weird assembly. */ | |
1994 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
1995 | { | |
1996 | struct elf_dyn_relocs **pp; | |
1997 | ||
1998 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1999 | { | |
2000 | p->count -= p->pc_count; | |
2001 | p->pc_count = 0; | |
2002 | if (p->count == 0) | |
2003 | *pp = p->next; | |
2004 | else | |
2005 | pp = &p->next; | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | /* Also discard relocs on undefined weak syms with non-default | |
2010 | visibility. */ | |
2011 | if (eh->dyn_relocs != NULL | |
2012 | && h->root.type == bfd_link_hash_undefweak) | |
2013 | { | |
2014 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
2015 | eh->dyn_relocs = NULL; | |
2016 | ||
2017 | /* Make sure undefined weak symbols are output as a dynamic | |
2018 | symbol in PIEs. */ | |
2019 | else if (h->dynindx == -1 | |
2020 | && ! h->forced_local | |
2021 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2022 | return FALSE; | |
2023 | } | |
2024 | ||
2025 | } | |
2026 | else if (ELIMINATE_COPY_RELOCS) | |
2027 | { | |
2028 | /* For the non-shared case, discard space for relocs against | |
2029 | symbols which turn out to need copy relocs or are not | |
2030 | dynamic. */ | |
2031 | ||
2032 | if (!h->non_got_ref | |
2033 | && ((h->def_dynamic | |
2034 | && !h->def_regular) | |
2035 | || (htab->elf.dynamic_sections_created | |
2036 | && (h->root.type == bfd_link_hash_undefweak | |
2037 | || h->root.type == bfd_link_hash_undefined)))) | |
2038 | { | |
2039 | /* Make sure this symbol is output as a dynamic symbol. | |
2040 | Undefined weak syms won't yet be marked as dynamic. */ | |
2041 | if (h->dynindx == -1 | |
2042 | && ! h->forced_local | |
2043 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2044 | return FALSE; | |
2045 | ||
2046 | /* If that succeeded, we know we'll be keeping all the | |
2047 | relocs. */ | |
2048 | if (h->dynindx != -1) | |
2049 | goto keep; | |
2050 | } | |
2051 | ||
2052 | eh->dyn_relocs = NULL; | |
2053 | ||
2054 | keep: ; | |
2055 | } | |
2056 | ||
2057 | /* Finally, allocate space. */ | |
2058 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
2059 | { | |
2060 | asection * sreloc; | |
2061 | ||
2062 | sreloc = elf_section_data (p->sec)->sreloc; | |
2063 | ||
2064 | BFD_ASSERT (sreloc != NULL); | |
2065 | ||
2066 | sreloc->size += p->count * sizeof (Elf64_External_Rela); | |
2067 | } | |
2068 | ||
2069 | return TRUE; | |
2070 | } | |
2071 | ||
2072 | /* Allocate space in .plt, .got and associated reloc sections for | |
2073 | local dynamic relocs. */ | |
2074 | ||
2075 | static bfd_boolean | |
2076 | elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf) | |
2077 | { | |
2078 | struct elf_link_hash_entry *h | |
2079 | = (struct elf_link_hash_entry *) *slot; | |
2080 | ||
2081 | if (h->type != STT_GNU_IFUNC | |
2082 | || !h->def_regular | |
2083 | || !h->ref_regular | |
2084 | || !h->forced_local | |
2085 | || h->root.type != bfd_link_hash_defined) | |
2086 | abort (); | |
2087 | ||
2088 | return elf64_x86_64_allocate_dynrelocs (h, inf); | |
2089 | } | |
2090 | ||
2091 | /* Find any dynamic relocs that apply to read-only sections. */ | |
2092 | ||
2093 | static bfd_boolean | |
2094 | elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) | |
2095 | { | |
2096 | struct elf64_x86_64_link_hash_entry *eh; | |
2097 | struct elf_dyn_relocs *p; | |
2098 | ||
2099 | if (h->root.type == bfd_link_hash_warning) | |
2100 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2101 | ||
2102 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
2103 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
2104 | { | |
2105 | asection *s = p->sec->output_section; | |
2106 | ||
2107 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
2108 | { | |
2109 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
2110 | ||
2111 | info->flags |= DF_TEXTREL; | |
2112 | ||
2113 | /* Not an error, just cut short the traversal. */ | |
2114 | return FALSE; | |
2115 | } | |
2116 | } | |
2117 | return TRUE; | |
2118 | } | |
2119 | ||
2120 | /* Set the sizes of the dynamic sections. */ | |
2121 | ||
2122 | static bfd_boolean | |
2123 | elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, | |
2124 | struct bfd_link_info *info) | |
2125 | { | |
2126 | struct elf64_x86_64_link_hash_table *htab; | |
2127 | bfd *dynobj; | |
2128 | asection *s; | |
2129 | bfd_boolean relocs; | |
2130 | bfd *ibfd; | |
2131 | ||
2132 | htab = elf64_x86_64_hash_table (info); | |
2133 | dynobj = htab->elf.dynobj; | |
2134 | if (dynobj == NULL) | |
2135 | abort (); | |
2136 | ||
2137 | if (htab->elf.dynamic_sections_created) | |
2138 | { | |
2139 | /* Set the contents of the .interp section to the interpreter. */ | |
2140 | if (info->executable) | |
2141 | { | |
2142 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2143 | if (s == NULL) | |
2144 | abort (); | |
2145 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2146 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | /* Set up .got offsets for local syms, and space for local dynamic | |
2151 | relocs. */ | |
2152 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) | |
2153 | { | |
2154 | bfd_signed_vma *local_got; | |
2155 | bfd_signed_vma *end_local_got; | |
2156 | char *local_tls_type; | |
2157 | bfd_vma *local_tlsdesc_gotent; | |
2158 | bfd_size_type locsymcount; | |
2159 | Elf_Internal_Shdr *symtab_hdr; | |
2160 | asection *srel; | |
2161 | ||
2162 | if (! is_x86_64_elf (ibfd)) | |
2163 | continue; | |
2164 | ||
2165 | for (s = ibfd->sections; s != NULL; s = s->next) | |
2166 | { | |
2167 | struct elf_dyn_relocs *p; | |
2168 | ||
2169 | for (p = (struct elf_dyn_relocs *) | |
2170 | (elf_section_data (s)->local_dynrel); | |
2171 | p != NULL; | |
2172 | p = p->next) | |
2173 | { | |
2174 | if (!bfd_is_abs_section (p->sec) | |
2175 | && bfd_is_abs_section (p->sec->output_section)) | |
2176 | { | |
2177 | /* Input section has been discarded, either because | |
2178 | it is a copy of a linkonce section or due to | |
2179 | linker script /DISCARD/, so we'll be discarding | |
2180 | the relocs too. */ | |
2181 | } | |
2182 | else if (p->count != 0) | |
2183 | { | |
2184 | srel = elf_section_data (p->sec)->sreloc; | |
2185 | srel->size += p->count * sizeof (Elf64_External_Rela); | |
2186 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) | |
2187 | info->flags |= DF_TEXTREL; | |
2188 | } | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | local_got = elf_local_got_refcounts (ibfd); | |
2193 | if (!local_got) | |
2194 | continue; | |
2195 | ||
2196 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
2197 | locsymcount = symtab_hdr->sh_info; | |
2198 | end_local_got = local_got + locsymcount; | |
2199 | local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); | |
2200 | local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd); | |
2201 | s = htab->elf.sgot; | |
2202 | srel = htab->elf.srelgot; | |
2203 | for (; local_got < end_local_got; | |
2204 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) | |
2205 | { | |
2206 | *local_tlsdesc_gotent = (bfd_vma) -1; | |
2207 | if (*local_got > 0) | |
2208 | { | |
2209 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
2210 | { | |
2211 | *local_tlsdesc_gotent = htab->elf.sgotplt->size | |
2212 | - elf64_x86_64_compute_jump_table_size (htab); | |
2213 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; | |
2214 | *local_got = (bfd_vma) -2; | |
2215 | } | |
2216 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
2217 | || GOT_TLS_GD_P (*local_tls_type)) | |
2218 | { | |
2219 | *local_got = s->size; | |
2220 | s->size += GOT_ENTRY_SIZE; | |
2221 | if (GOT_TLS_GD_P (*local_tls_type)) | |
2222 | s->size += GOT_ENTRY_SIZE; | |
2223 | } | |
2224 | if (info->shared | |
2225 | || GOT_TLS_GD_ANY_P (*local_tls_type) | |
2226 | || *local_tls_type == GOT_TLS_IE) | |
2227 | { | |
2228 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
2229 | { | |
2230 | htab->elf.srelplt->size | |
2231 | += sizeof (Elf64_External_Rela); | |
2232 | htab->tlsdesc_plt = (bfd_vma) -1; | |
2233 | } | |
2234 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
2235 | || GOT_TLS_GD_P (*local_tls_type)) | |
2236 | srel->size += sizeof (Elf64_External_Rela); | |
2237 | } | |
2238 | } | |
2239 | else | |
2240 | *local_got = (bfd_vma) -1; | |
2241 | } | |
2242 | } | |
2243 | ||
2244 | if (htab->tls_ld_got.refcount > 0) | |
2245 | { | |
2246 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD | |
2247 | relocs. */ | |
2248 | htab->tls_ld_got.offset = htab->elf.sgot->size; | |
2249 | htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; | |
2250 | htab->elf.srelgot->size += sizeof (Elf64_External_Rela); | |
2251 | } | |
2252 | else | |
2253 | htab->tls_ld_got.offset = -1; | |
2254 | ||
2255 | /* Allocate global sym .plt and .got entries, and space for global | |
2256 | sym dynamic relocs. */ | |
2257 | elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs, | |
2258 | info); | |
2259 | ||
2260 | /* Allocate .plt and .got entries, and space for local symbols. */ | |
2261 | htab_traverse (htab->loc_hash_table, | |
2262 | elf64_x86_64_allocate_local_dynrelocs, | |
2263 | info); | |
2264 | ||
2265 | /* For every jump slot reserved in the sgotplt, reloc_count is | |
2266 | incremented. However, when we reserve space for TLS descriptors, | |
2267 | it's not incremented, so in order to compute the space reserved | |
2268 | for them, it suffices to multiply the reloc count by the jump | |
2269 | slot size. */ | |
2270 | if (htab->elf.srelplt) | |
2271 | htab->sgotplt_jump_table_size | |
2272 | = elf64_x86_64_compute_jump_table_size (htab); | |
2273 | ||
2274 | if (htab->tlsdesc_plt) | |
2275 | { | |
2276 | /* If we're not using lazy TLS relocations, don't generate the | |
2277 | PLT and GOT entries they require. */ | |
2278 | if ((info->flags & DF_BIND_NOW)) | |
2279 | htab->tlsdesc_plt = 0; | |
2280 | else | |
2281 | { | |
2282 | htab->tlsdesc_got = htab->elf.sgot->size; | |
2283 | htab->elf.sgot->size += GOT_ENTRY_SIZE; | |
2284 | /* Reserve room for the initial entry. | |
2285 | FIXME: we could probably do away with it in this case. */ | |
2286 | if (htab->elf.splt->size == 0) | |
2287 | htab->elf.splt->size += PLT_ENTRY_SIZE; | |
2288 | htab->tlsdesc_plt = htab->elf.splt->size; | |
2289 | htab->elf.splt->size += PLT_ENTRY_SIZE; | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | /* We now have determined the sizes of the various dynamic sections. | |
2294 | Allocate memory for them. */ | |
2295 | relocs = FALSE; | |
2296 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2297 | { | |
2298 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2299 | continue; | |
2300 | ||
2301 | if (s == htab->elf.splt | |
2302 | || s == htab->elf.sgot | |
2303 | || s == htab->elf.sgotplt | |
2304 | || s == htab->elf.iplt | |
2305 | || s == htab->elf.igotplt | |
2306 | || s == htab->sdynbss) | |
2307 | { | |
2308 | /* Strip this section if we don't need it; see the | |
2309 | comment below. */ | |
2310 | } | |
2311 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) | |
2312 | { | |
2313 | if (s->size != 0 && s != htab->elf.srelplt) | |
2314 | relocs = TRUE; | |
2315 | ||
2316 | /* We use the reloc_count field as a counter if we need | |
2317 | to copy relocs into the output file. */ | |
2318 | if (s != htab->elf.srelplt) | |
2319 | s->reloc_count = 0; | |
2320 | } | |
2321 | else | |
2322 | { | |
2323 | /* It's not one of our sections, so don't allocate space. */ | |
2324 | continue; | |
2325 | } | |
2326 | ||
2327 | if (s->size == 0) | |
2328 | { | |
2329 | /* If we don't need this section, strip it from the | |
2330 | output file. This is mostly to handle .rela.bss and | |
2331 | .rela.plt. We must create both sections in | |
2332 | create_dynamic_sections, because they must be created | |
2333 | before the linker maps input sections to output | |
2334 | sections. The linker does that before | |
2335 | adjust_dynamic_symbol is called, and it is that | |
2336 | function which decides whether anything needs to go | |
2337 | into these sections. */ | |
2338 | ||
2339 | s->flags |= SEC_EXCLUDE; | |
2340 | continue; | |
2341 | } | |
2342 | ||
2343 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
2344 | continue; | |
2345 | ||
2346 | /* Allocate memory for the section contents. We use bfd_zalloc | |
2347 | here in case unused entries are not reclaimed before the | |
2348 | section's contents are written out. This should not happen, | |
2349 | but this way if it does, we get a R_X86_64_NONE reloc instead | |
2350 | of garbage. */ | |
2351 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); | |
2352 | if (s->contents == NULL) | |
2353 | return FALSE; | |
2354 | } | |
2355 | ||
2356 | if (htab->elf.dynamic_sections_created) | |
2357 | { | |
2358 | /* Add some entries to the .dynamic section. We fill in the | |
2359 | values later, in elf64_x86_64_finish_dynamic_sections, but we | |
2360 | must add the entries now so that we get the correct size for | |
2361 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2362 | dynamic linker and used by the debugger. */ | |
2363 | #define add_dynamic_entry(TAG, VAL) \ | |
2364 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
2365 | ||
2366 | if (info->executable) | |
2367 | { | |
2368 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
2369 | return FALSE; | |
2370 | } | |
2371 | ||
2372 | if (htab->elf.splt->size != 0) | |
2373 | { | |
2374 | if (!add_dynamic_entry (DT_PLTGOT, 0) | |
2375 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
2376 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) | |
2377 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
2378 | return FALSE; | |
2379 | ||
2380 | if (htab->tlsdesc_plt | |
2381 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) | |
2382 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) | |
2383 | return FALSE; | |
2384 | } | |
2385 | ||
2386 | if (relocs) | |
2387 | { | |
2388 | if (!add_dynamic_entry (DT_RELA, 0) | |
2389 | || !add_dynamic_entry (DT_RELASZ, 0) | |
2390 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) | |
2391 | return FALSE; | |
2392 | ||
2393 | /* If any dynamic relocs apply to a read-only section, | |
2394 | then we need a DT_TEXTREL entry. */ | |
2395 | if ((info->flags & DF_TEXTREL) == 0) | |
2396 | elf_link_hash_traverse (&htab->elf, | |
2397 | elf64_x86_64_readonly_dynrelocs, | |
2398 | info); | |
2399 | ||
2400 | if ((info->flags & DF_TEXTREL) != 0) | |
2401 | { | |
2402 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
2403 | return FALSE; | |
2404 | } | |
2405 | } | |
2406 | } | |
2407 | #undef add_dynamic_entry | |
2408 | ||
2409 | return TRUE; | |
2410 | } | |
2411 | ||
2412 | static bfd_boolean | |
2413 | elf64_x86_64_always_size_sections (bfd *output_bfd, | |
2414 | struct bfd_link_info *info) | |
2415 | { | |
2416 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
2417 | ||
2418 | if (tls_sec) | |
2419 | { | |
2420 | struct elf_link_hash_entry *tlsbase; | |
2421 | ||
2422 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
2423 | "_TLS_MODULE_BASE_", | |
2424 | FALSE, FALSE, FALSE); | |
2425 | ||
2426 | if (tlsbase && tlsbase->type == STT_TLS) | |
2427 | { | |
2428 | struct bfd_link_hash_entry *bh = NULL; | |
2429 | const struct elf_backend_data *bed | |
2430 | = get_elf_backend_data (output_bfd); | |
2431 | ||
2432 | if (!(_bfd_generic_link_add_one_symbol | |
2433 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
2434 | tls_sec, 0, NULL, FALSE, | |
2435 | bed->collect, &bh))) | |
2436 | return FALSE; | |
2437 | ||
2438 | elf64_x86_64_hash_table (info)->tls_module_base = bh; | |
2439 | ||
2440 | tlsbase = (struct elf_link_hash_entry *)bh; | |
2441 | tlsbase->def_regular = 1; | |
2442 | tlsbase->other = STV_HIDDEN; | |
2443 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | return TRUE; | |
2448 | } | |
2449 | ||
2450 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking | |
2451 | executables. Rather than setting it to the beginning of the TLS | |
2452 | section, we have to set it to the end. This function may be called | |
2453 | multiple times, it is idempotent. */ | |
2454 | ||
2455 | static void | |
2456 | elf64_x86_64_set_tls_module_base (struct bfd_link_info *info) | |
2457 | { | |
2458 | struct bfd_link_hash_entry *base; | |
2459 | ||
2460 | if (!info->executable) | |
2461 | return; | |
2462 | ||
2463 | base = elf64_x86_64_hash_table (info)->tls_module_base; | |
2464 | ||
2465 | if (!base) | |
2466 | return; | |
2467 | ||
2468 | base->u.def.value = elf_hash_table (info)->tls_size; | |
2469 | } | |
2470 | ||
2471 | /* Return the base VMA address which should be subtracted from real addresses | |
2472 | when resolving @dtpoff relocation. | |
2473 | This is PT_TLS segment p_vaddr. */ | |
2474 | ||
2475 | static bfd_vma | |
2476 | elf64_x86_64_dtpoff_base (struct bfd_link_info *info) | |
2477 | { | |
2478 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
2479 | if (elf_hash_table (info)->tls_sec == NULL) | |
2480 | return 0; | |
2481 | return elf_hash_table (info)->tls_sec->vma; | |
2482 | } | |
2483 | ||
2484 | /* Return the relocation value for @tpoff relocation | |
2485 | if STT_TLS virtual address is ADDRESS. */ | |
2486 | ||
2487 | static bfd_vma | |
2488 | elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) | |
2489 | { | |
2490 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
2491 | ||
2492 | /* If tls_segment is NULL, we should have signalled an error already. */ | |
2493 | if (htab->tls_sec == NULL) | |
2494 | return 0; | |
2495 | return address - htab->tls_size - htab->tls_sec->vma; | |
2496 | } | |
2497 | ||
2498 | /* Is the instruction before OFFSET in CONTENTS a 32bit relative | |
2499 | branch? */ | |
2500 | ||
2501 | static bfd_boolean | |
2502 | is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) | |
2503 | { | |
2504 | /* Opcode Instruction | |
2505 | 0xe8 call | |
2506 | 0xe9 jump | |
2507 | 0x0f 0x8x conditional jump */ | |
2508 | return ((offset > 0 | |
2509 | && (contents [offset - 1] == 0xe8 | |
2510 | || contents [offset - 1] == 0xe9)) | |
2511 | || (offset > 1 | |
2512 | && contents [offset - 2] == 0x0f | |
2513 | && (contents [offset - 1] & 0xf0) == 0x80)); | |
2514 | } | |
2515 | ||
2516 | /* Relocate an x86_64 ELF section. */ | |
2517 | ||
2518 | static bfd_boolean | |
2519 | elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info, | |
2520 | bfd *input_bfd, asection *input_section, | |
2521 | bfd_byte *contents, Elf_Internal_Rela *relocs, | |
2522 | Elf_Internal_Sym *local_syms, | |
2523 | asection **local_sections) | |
2524 | { | |
2525 | struct elf64_x86_64_link_hash_table *htab; | |
2526 | Elf_Internal_Shdr *symtab_hdr; | |
2527 | struct elf_link_hash_entry **sym_hashes; | |
2528 | bfd_vma *local_got_offsets; | |
2529 | bfd_vma *local_tlsdesc_gotents; | |
2530 | Elf_Internal_Rela *rel; | |
2531 | Elf_Internal_Rela *relend; | |
2532 | ||
2533 | BFD_ASSERT (is_x86_64_elf (input_bfd)); | |
2534 | ||
2535 | htab = elf64_x86_64_hash_table (info); | |
2536 | symtab_hdr = &elf_symtab_hdr (input_bfd); | |
2537 | sym_hashes = elf_sym_hashes (input_bfd); | |
2538 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
2539 | local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd); | |
2540 | ||
2541 | elf64_x86_64_set_tls_module_base (info); | |
2542 | ||
2543 | rel = relocs; | |
2544 | relend = relocs + input_section->reloc_count; | |
2545 | for (; rel < relend; rel++) | |
2546 | { | |
2547 | unsigned int r_type; | |
2548 | reloc_howto_type *howto; | |
2549 | unsigned long r_symndx; | |
2550 | struct elf_link_hash_entry *h; | |
2551 | Elf_Internal_Sym *sym; | |
2552 | asection *sec; | |
2553 | bfd_vma off, offplt; | |
2554 | bfd_vma relocation; | |
2555 | bfd_boolean unresolved_reloc; | |
2556 | bfd_reloc_status_type r; | |
2557 | int tls_type; | |
2558 | asection *base_got; | |
2559 | ||
2560 | r_type = ELF64_R_TYPE (rel->r_info); | |
2561 | if (r_type == (int) R_X86_64_GNU_VTINHERIT | |
2562 | || r_type == (int) R_X86_64_GNU_VTENTRY) | |
2563 | continue; | |
2564 | ||
2565 | if (r_type >= R_X86_64_max) | |
2566 | { | |
2567 | bfd_set_error (bfd_error_bad_value); | |
2568 | return FALSE; | |
2569 | } | |
2570 | ||
2571 | howto = x86_64_elf_howto_table + r_type; | |
2572 | r_symndx = ELF64_R_SYM (rel->r_info); | |
2573 | h = NULL; | |
2574 | sym = NULL; | |
2575 | sec = NULL; | |
2576 | unresolved_reloc = FALSE; | |
2577 | if (r_symndx < symtab_hdr->sh_info) | |
2578 | { | |
2579 | sym = local_syms + r_symndx; | |
2580 | sec = local_sections[r_symndx]; | |
2581 | ||
2582 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, | |
2583 | &sec, rel); | |
2584 | ||
2585 | /* Relocate against local STT_GNU_IFUNC symbol. */ | |
2586 | if (ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) | |
2587 | { | |
2588 | h = elf64_x86_64_get_local_sym_hash (htab, input_bfd, | |
2589 | rel, FALSE); | |
2590 | if (h == NULL) | |
2591 | abort (); | |
2592 | ||
2593 | /* Set STT_GNU_IFUNC symbol value. */ | |
2594 | h->root.u.def.value = sym->st_value; | |
2595 | h->root.u.def.section = sec; | |
2596 | } | |
2597 | } | |
2598 | else | |
2599 | { | |
2600 | bfd_boolean warned; | |
2601 | ||
2602 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
2603 | r_symndx, symtab_hdr, sym_hashes, | |
2604 | h, sec, relocation, | |
2605 | unresolved_reloc, warned); | |
2606 | } | |
2607 | ||
2608 | if (sec != NULL && elf_discarded_section (sec)) | |
2609 | { | |
2610 | /* For relocs against symbols from removed linkonce sections, | |
2611 | or sections discarded by a linker script, we just want the | |
2612 | section contents zeroed. Avoid any special processing. */ | |
2613 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); | |
2614 | rel->r_info = 0; | |
2615 | rel->r_addend = 0; | |
2616 | continue; | |
2617 | } | |
2618 | ||
2619 | if (info->relocatable) | |
2620 | continue; | |
2621 | ||
2622 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle | |
2623 | it here if it is defined in a non-shared object. */ | |
2624 | if (h != NULL | |
2625 | && h->type == STT_GNU_IFUNC | |
2626 | && h->def_regular) | |
2627 | { | |
2628 | asection *plt; | |
2629 | bfd_vma plt_index; | |
2630 | ||
2631 | if ((input_section->flags & SEC_ALLOC) == 0 | |
2632 | || h->plt.offset == (bfd_vma) -1) | |
2633 | abort (); | |
2634 | ||
2635 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
2636 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
2637 | relocation = (plt->output_section->vma | |
2638 | + plt->output_offset + h->plt.offset); | |
2639 | ||
2640 | switch (r_type) | |
2641 | { | |
2642 | default: | |
2643 | (*_bfd_error_handler) | |
2644 | (_("%B: relocation %s against STT_GNU_IFUNC " | |
2645 | "symbol `%s' isn't handled by %s"), input_bfd, | |
2646 | x86_64_elf_howto_table[r_type].name, | |
2647 | (h->root.root.string | |
2648 | ? h->root.root.string : "a local symbol"), | |
2649 | __FUNCTION__); | |
2650 | bfd_set_error (bfd_error_bad_value); | |
2651 | return FALSE; | |
2652 | ||
2653 | case R_X86_64_32S: | |
2654 | if (info->shared) | |
2655 | abort (); | |
2656 | goto do_relocation; | |
2657 | ||
2658 | case R_X86_64_64: | |
2659 | if (rel->r_addend != 0) | |
2660 | { | |
2661 | (*_bfd_error_handler) | |
2662 | (_("%B: relocation %s against STT_GNU_IFUNC " | |
2663 | "symbol `%s' has non-zero addend: %d"), | |
2664 | input_bfd, x86_64_elf_howto_table[r_type].name, | |
2665 | (h->root.root.string | |
2666 | ? h->root.root.string : "a local symbol"), | |
2667 | rel->r_addend); | |
2668 | bfd_set_error (bfd_error_bad_value); | |
2669 | return FALSE; | |
2670 | } | |
2671 | ||
2672 | /* Generate dynamic relcoation only when there is a | |
2673 | non-GOF reference in a shared object. */ | |
2674 | if (info->shared && h->non_got_ref) | |
2675 | { | |
2676 | Elf_Internal_Rela outrel; | |
2677 | bfd_byte *loc; | |
2678 | asection *sreloc; | |
2679 | ||
2680 | /* Need a dynamic relocation to get the real function | |
2681 | address. */ | |
2682 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, | |
2683 | info, | |
2684 | input_section, | |
2685 | rel->r_offset); | |
2686 | if (outrel.r_offset == (bfd_vma) -1 | |
2687 | || outrel.r_offset == (bfd_vma) -2) | |
2688 | abort (); | |
2689 | ||
2690 | outrel.r_offset += (input_section->output_section->vma | |
2691 | + input_section->output_offset); | |
2692 | ||
2693 | if (h->dynindx == -1 | |
2694 | || h->forced_local | |
2695 | || info->executable) | |
2696 | { | |
2697 | /* This symbol is resolved locally. */ | |
2698 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE); | |
2699 | outrel.r_addend = (h->root.u.def.value | |
2700 | + h->root.u.def.section->output_section->vma | |
2701 | + h->root.u.def.section->output_offset); | |
2702 | } | |
2703 | else | |
2704 | { | |
2705 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); | |
2706 | outrel.r_addend = 0; | |
2707 | } | |
2708 | ||
2709 | sreloc = htab->elf.irelifunc; | |
2710 | loc = sreloc->contents; | |
2711 | loc += (sreloc->reloc_count++ | |
2712 | * sizeof (Elf64_External_Rela)); | |
2713 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
2714 | ||
2715 | /* If this reloc is against an external symbol, we | |
2716 | do not want to fiddle with the addend. Otherwise, | |
2717 | we need to include the symbol value so that it | |
2718 | becomes an addend for the dynamic reloc. For an | |
2719 | internal symbol, we have updated addend. */ | |
2720 | continue; | |
2721 | } | |
2722 | ||
2723 | case R_X86_64_32: | |
2724 | case R_X86_64_PC32: | |
2725 | case R_X86_64_PC64: | |
2726 | case R_X86_64_PLT32: | |
2727 | goto do_relocation; | |
2728 | ||
2729 | case R_X86_64_GOTPCREL: | |
2730 | case R_X86_64_GOTPCREL64: | |
2731 | base_got = htab->elf.sgot; | |
2732 | off = h->got.offset; | |
2733 | ||
2734 | if (base_got == NULL) | |
2735 | abort (); | |
2736 | ||
2737 | if (off == (bfd_vma) -1) | |
2738 | { | |
2739 | /* We can't use h->got.offset here to save state, or | |
2740 | even just remember the offset, as finish_dynamic_symbol | |
2741 | would use that as offset into .got. */ | |
2742 | ||
2743 | if (htab->elf.splt != NULL) | |
2744 | { | |
2745 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
2746 | off = (plt_index + 3) * GOT_ENTRY_SIZE; | |
2747 | base_got = htab->elf.sgotplt; | |
2748 | } | |
2749 | else | |
2750 | { | |
2751 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; | |
2752 | off = plt_index * GOT_ENTRY_SIZE; | |
2753 | base_got = htab->elf.igotplt; | |
2754 | } | |
2755 | ||
2756 | if (h->dynindx == -1 | |
2757 | || h->forced_local | |
2758 | || info->symbolic) | |
2759 | { | |
2760 | /* This references the local defitionion. We must | |
2761 | initialize this entry in the global offset table. | |
2762 | Since the offset must always be a multiple of 8, | |
2763 | we use the least significant bit to record | |
2764 | whether we have initialized it already. | |
2765 | ||
2766 | When doing a dynamic link, we create a .rela.got | |
2767 | relocation entry to initialize the value. This | |
2768 | is done in the finish_dynamic_symbol routine. */ | |
2769 | if ((off & 1) != 0) | |
2770 | off &= ~1; | |
2771 | else | |
2772 | { | |
2773 | bfd_put_64 (output_bfd, relocation, | |
2774 | base_got->contents + off); | |
2775 | /* Note that this is harmless for the GOTPLT64 | |
2776 | case, as -1 | 1 still is -1. */ | |
2777 | h->got.offset |= 1; | |
2778 | } | |
2779 | } | |
2780 | } | |
2781 | ||
2782 | relocation = (base_got->output_section->vma | |
2783 | + base_got->output_offset + off); | |
2784 | ||
2785 | if (r_type != R_X86_64_GOTPCREL | |
2786 | && r_type != R_X86_64_GOTPCREL64) | |
2787 | { | |
2788 | asection *gotplt; | |
2789 | if (htab->elf.splt != NULL) | |
2790 | gotplt = htab->elf.sgotplt; | |
2791 | else | |
2792 | gotplt = htab->elf.igotplt; | |
2793 | relocation -= (gotplt->output_section->vma | |
2794 | - gotplt->output_offset); | |
2795 | } | |
2796 | ||
2797 | goto do_relocation; | |
2798 | } | |
2799 | } | |
2800 | ||
2801 | /* When generating a shared object, the relocations handled here are | |
2802 | copied into the output file to be resolved at run time. */ | |
2803 | switch (r_type) | |
2804 | { | |
2805 | case R_X86_64_GOT32: | |
2806 | case R_X86_64_GOT64: | |
2807 | /* Relocation is to the entry for this symbol in the global | |
2808 | offset table. */ | |
2809 | case R_X86_64_GOTPCREL: | |
2810 | case R_X86_64_GOTPCREL64: | |
2811 | /* Use global offset table entry as symbol value. */ | |
2812 | case R_X86_64_GOTPLT64: | |
2813 | /* This is the same as GOT64 for relocation purposes, but | |
2814 | indicates the existence of a PLT entry. The difficulty is, | |
2815 | that we must calculate the GOT slot offset from the PLT | |
2816 | offset, if this symbol got a PLT entry (it was global). | |
2817 | Additionally if it's computed from the PLT entry, then that | |
2818 | GOT offset is relative to .got.plt, not to .got. */ | |
2819 | base_got = htab->elf.sgot; | |
2820 | ||
2821 | if (htab->elf.sgot == NULL) | |
2822 | abort (); | |
2823 | ||
2824 | if (h != NULL) | |
2825 | { | |
2826 | bfd_boolean dyn; | |
2827 | ||
2828 | off = h->got.offset; | |
2829 | if (h->needs_plt | |
2830 | && h->plt.offset != (bfd_vma)-1 | |
2831 | && off == (bfd_vma)-1) | |
2832 | { | |
2833 | /* We can't use h->got.offset here to save | |
2834 | state, or even just remember the offset, as | |
2835 | finish_dynamic_symbol would use that as offset into | |
2836 | .got. */ | |
2837 | bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
2838 | off = (plt_index + 3) * GOT_ENTRY_SIZE; | |
2839 | base_got = htab->elf.sgotplt; | |
2840 | } | |
2841 | ||
2842 | dyn = htab->elf.dynamic_sections_created; | |
2843 | ||
2844 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) | |
2845 | || (info->shared | |
2846 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
2847 | || (ELF_ST_VISIBILITY (h->other) | |
2848 | && h->root.type == bfd_link_hash_undefweak)) | |
2849 | { | |
2850 | /* This is actually a static link, or it is a -Bsymbolic | |
2851 | link and the symbol is defined locally, or the symbol | |
2852 | was forced to be local because of a version file. We | |
2853 | must initialize this entry in the global offset table. | |
2854 | Since the offset must always be a multiple of 8, we | |
2855 | use the least significant bit to record whether we | |
2856 | have initialized it already. | |
2857 | ||
2858 | When doing a dynamic link, we create a .rela.got | |
2859 | relocation entry to initialize the value. This is | |
2860 | done in the finish_dynamic_symbol routine. */ | |
2861 | if ((off & 1) != 0) | |
2862 | off &= ~1; | |
2863 | else | |
2864 | { | |
2865 | bfd_put_64 (output_bfd, relocation, | |
2866 | base_got->contents + off); | |
2867 | /* Note that this is harmless for the GOTPLT64 case, | |
2868 | as -1 | 1 still is -1. */ | |
2869 | h->got.offset |= 1; | |
2870 | } | |
2871 | } | |
2872 | else | |
2873 | unresolved_reloc = FALSE; | |
2874 | } | |
2875 | else | |
2876 | { | |
2877 | if (local_got_offsets == NULL) | |
2878 | abort (); | |
2879 | ||
2880 | off = local_got_offsets[r_symndx]; | |
2881 | ||
2882 | /* The offset must always be a multiple of 8. We use | |
2883 | the least significant bit to record whether we have | |
2884 | already generated the necessary reloc. */ | |
2885 | if ((off & 1) != 0) | |
2886 | off &= ~1; | |
2887 | else | |
2888 | { | |
2889 | bfd_put_64 (output_bfd, relocation, | |
2890 | base_got->contents + off); | |
2891 | ||
2892 | if (info->shared) | |
2893 | { | |
2894 | asection *s; | |
2895 | Elf_Internal_Rela outrel; | |
2896 | bfd_byte *loc; | |
2897 | ||
2898 | /* We need to generate a R_X86_64_RELATIVE reloc | |
2899 | for the dynamic linker. */ | |
2900 | s = htab->elf.srelgot; | |
2901 | if (s == NULL) | |
2902 | abort (); | |
2903 | ||
2904 | outrel.r_offset = (base_got->output_section->vma | |
2905 | + base_got->output_offset | |
2906 | + off); | |
2907 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); | |
2908 | outrel.r_addend = relocation; | |
2909 | loc = s->contents; | |
2910 | loc += s->reloc_count++ * sizeof (Elf64_External_Rela); | |
2911 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
2912 | } | |
2913 | ||
2914 | local_got_offsets[r_symndx] |= 1; | |
2915 | } | |
2916 | } | |
2917 | ||
2918 | if (off >= (bfd_vma) -2) | |
2919 | abort (); | |
2920 | ||
2921 | relocation = base_got->output_section->vma | |
2922 | + base_got->output_offset + off; | |
2923 | if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) | |
2924 | relocation -= htab->elf.sgotplt->output_section->vma | |
2925 | - htab->elf.sgotplt->output_offset; | |
2926 | ||
2927 | break; | |
2928 | ||
2929 | case R_X86_64_GOTOFF64: | |
2930 | /* Relocation is relative to the start of the global offset | |
2931 | table. */ | |
2932 | ||
2933 | /* Check to make sure it isn't a protected function symbol | |
2934 | for shared library since it may not be local when used | |
2935 | as function address. */ | |
2936 | if (info->shared | |
2937 | && h | |
2938 | && h->def_regular | |
2939 | && h->type == STT_FUNC | |
2940 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) | |
2941 | { | |
2942 | (*_bfd_error_handler) | |
2943 | (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), | |
2944 | input_bfd, h->root.root.string); | |
2945 | bfd_set_error (bfd_error_bad_value); | |
2946 | return FALSE; | |
2947 | } | |
2948 | ||
2949 | /* Note that sgot is not involved in this | |
2950 | calculation. We always want the start of .got.plt. If we | |
2951 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is | |
2952 | permitted by the ABI, we might have to change this | |
2953 | calculation. */ | |
2954 | relocation -= htab->elf.sgotplt->output_section->vma | |
2955 | + htab->elf.sgotplt->output_offset; | |
2956 | break; | |
2957 | ||
2958 | case R_X86_64_GOTPC32: | |
2959 | case R_X86_64_GOTPC64: | |
2960 | /* Use global offset table as symbol value. */ | |
2961 | relocation = htab->elf.sgotplt->output_section->vma | |
2962 | + htab->elf.sgotplt->output_offset; | |
2963 | unresolved_reloc = FALSE; | |
2964 | break; | |
2965 | ||
2966 | case R_X86_64_PLTOFF64: | |
2967 | /* Relocation is PLT entry relative to GOT. For local | |
2968 | symbols it's the symbol itself relative to GOT. */ | |
2969 | if (h != NULL | |
2970 | /* See PLT32 handling. */ | |
2971 | && h->plt.offset != (bfd_vma) -1 | |
2972 | && htab->elf.splt != NULL) | |
2973 | { | |
2974 | relocation = (htab->elf.splt->output_section->vma | |
2975 | + htab->elf.splt->output_offset | |
2976 | + h->plt.offset); | |
2977 | unresolved_reloc = FALSE; | |
2978 | } | |
2979 | ||
2980 | relocation -= htab->elf.sgotplt->output_section->vma | |
2981 | + htab->elf.sgotplt->output_offset; | |
2982 | break; | |
2983 | ||
2984 | case R_X86_64_PLT32: | |
2985 | /* Relocation is to the entry for this symbol in the | |
2986 | procedure linkage table. */ | |
2987 | ||
2988 | /* Resolve a PLT32 reloc against a local symbol directly, | |
2989 | without using the procedure linkage table. */ | |
2990 | if (h == NULL) | |
2991 | break; | |
2992 | ||
2993 | if (h->plt.offset == (bfd_vma) -1 | |
2994 | || htab->elf.splt == NULL) | |
2995 | { | |
2996 | /* We didn't make a PLT entry for this symbol. This | |
2997 | happens when statically linking PIC code, or when | |
2998 | using -Bsymbolic. */ | |
2999 | break; | |
3000 | } | |
3001 | ||
3002 | relocation = (htab->elf.splt->output_section->vma | |
3003 | + htab->elf.splt->output_offset | |
3004 | + h->plt.offset); | |
3005 | unresolved_reloc = FALSE; | |
3006 | break; | |
3007 | ||
3008 | case R_X86_64_PC8: | |
3009 | case R_X86_64_PC16: | |
3010 | case R_X86_64_PC32: | |
3011 | if (info->shared | |
3012 | && (input_section->flags & SEC_ALLOC) != 0 | |
3013 | && (input_section->flags & SEC_READONLY) != 0 | |
3014 | && h != NULL) | |
3015 | { | |
3016 | bfd_boolean fail = FALSE; | |
3017 | bfd_boolean branch | |
3018 | = (r_type == R_X86_64_PC32 | |
3019 | && is_32bit_relative_branch (contents, rel->r_offset)); | |
3020 | ||
3021 | if (SYMBOL_REFERENCES_LOCAL (info, h)) | |
3022 | { | |
3023 | /* Symbol is referenced locally. Make sure it is | |
3024 | defined locally or for a branch. */ | |
3025 | fail = !h->def_regular && !branch; | |
3026 | } | |
3027 | else | |
3028 | { | |
3029 | /* Symbol isn't referenced locally. We only allow | |
3030 | branch to symbol with non-default visibility. */ | |
3031 | fail = (!branch | |
3032 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT); | |
3033 | } | |
3034 | ||
3035 | if (fail) | |
3036 | { | |
3037 | const char *fmt; | |
3038 | const char *v; | |
3039 | const char *pic = ""; | |
3040 | ||
3041 | switch (ELF_ST_VISIBILITY (h->other)) | |
3042 | { | |
3043 | case STV_HIDDEN: | |
3044 | v = _("hidden symbol"); | |
3045 | break; | |
3046 | case STV_INTERNAL: | |
3047 | v = _("internal symbol"); | |
3048 | break; | |
3049 | case STV_PROTECTED: | |
3050 | v = _("protected symbol"); | |
3051 | break; | |
3052 | default: | |
3053 | v = _("symbol"); | |
3054 | pic = _("; recompile with -fPIC"); | |
3055 | break; | |
3056 | } | |
3057 | ||
3058 | if (h->def_regular) | |
3059 | fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s"); | |
3060 | else | |
3061 | fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s"); | |
3062 | ||
3063 | (*_bfd_error_handler) (fmt, input_bfd, | |
3064 | x86_64_elf_howto_table[r_type].name, | |
3065 | v, h->root.root.string, pic); | |
3066 | bfd_set_error (bfd_error_bad_value); | |
3067 | return FALSE; | |
3068 | } | |
3069 | } | |
3070 | /* Fall through. */ | |
3071 | ||
3072 | case R_X86_64_8: | |
3073 | case R_X86_64_16: | |
3074 | case R_X86_64_32: | |
3075 | case R_X86_64_PC64: | |
3076 | case R_X86_64_64: | |
3077 | /* FIXME: The ABI says the linker should make sure the value is | |
3078 | the same when it's zeroextended to 64 bit. */ | |
3079 | ||
3080 | if ((input_section->flags & SEC_ALLOC) == 0) | |
3081 | break; | |
3082 | ||
3083 | if ((info->shared | |
3084 | && (h == NULL | |
3085 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
3086 | || h->root.type != bfd_link_hash_undefweak) | |
3087 | && (! IS_X86_64_PCREL_TYPE (r_type) | |
3088 | || ! SYMBOL_CALLS_LOCAL (info, h))) | |
3089 | || (ELIMINATE_COPY_RELOCS | |
3090 | && !info->shared | |
3091 | && h != NULL | |
3092 | && h->dynindx != -1 | |
3093 | && !h->non_got_ref | |
3094 | && ((h->def_dynamic | |
3095 | && !h->def_regular) | |
3096 | || h->root.type == bfd_link_hash_undefweak | |
3097 | || h->root.type == bfd_link_hash_undefined))) | |
3098 | { | |
3099 | Elf_Internal_Rela outrel; | |
3100 | bfd_byte *loc; | |
3101 | bfd_boolean skip, relocate; | |
3102 | asection *sreloc; | |
3103 | ||
3104 | /* When generating a shared object, these relocations | |
3105 | are copied into the output file to be resolved at run | |
3106 | time. */ | |
3107 | skip = FALSE; | |
3108 | relocate = FALSE; | |
3109 | ||
3110 | outrel.r_offset = | |
3111 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
3112 | rel->r_offset); | |
3113 | if (outrel.r_offset == (bfd_vma) -1) | |
3114 | skip = TRUE; | |
3115 | else if (outrel.r_offset == (bfd_vma) -2) | |
3116 | skip = TRUE, relocate = TRUE; | |
3117 | ||
3118 | outrel.r_offset += (input_section->output_section->vma | |
3119 | + input_section->output_offset); | |
3120 | ||
3121 | if (skip) | |
3122 | memset (&outrel, 0, sizeof outrel); | |
3123 | ||
3124 | /* h->dynindx may be -1 if this symbol was marked to | |
3125 | become local. */ | |
3126 | else if (h != NULL | |
3127 | && h->dynindx != -1 | |
3128 | && (IS_X86_64_PCREL_TYPE (r_type) | |
3129 | || ! info->shared | |
3130 | || ! SYMBOLIC_BIND (info, h) | |
3131 | || ! h->def_regular)) | |
3132 | { | |
3133 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); | |
3134 | outrel.r_addend = rel->r_addend; | |
3135 | } | |
3136 | else | |
3137 | { | |
3138 | /* This symbol is local, or marked to become local. */ | |
3139 | if (r_type == R_X86_64_64) | |
3140 | { | |
3141 | relocate = TRUE; | |
3142 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); | |
3143 | outrel.r_addend = relocation + rel->r_addend; | |
3144 | } | |
3145 | else | |
3146 | { | |
3147 | long sindx; | |
3148 | ||
3149 | if (bfd_is_abs_section (sec)) | |
3150 | sindx = 0; | |
3151 | else if (sec == NULL || sec->owner == NULL) | |
3152 | { | |
3153 | bfd_set_error (bfd_error_bad_value); | |
3154 | return FALSE; | |
3155 | } | |
3156 | else | |
3157 | { | |
3158 | asection *osec; | |
3159 | ||
3160 | /* We are turning this relocation into one | |
3161 | against a section symbol. It would be | |
3162 | proper to subtract the symbol's value, | |
3163 | osec->vma, from the emitted reloc addend, | |
3164 | but ld.so expects buggy relocs. */ | |
3165 | osec = sec->output_section; | |
3166 | sindx = elf_section_data (osec)->dynindx; | |
3167 | if (sindx == 0) | |
3168 | { | |
3169 | asection *oi = htab->elf.text_index_section; | |
3170 | sindx = elf_section_data (oi)->dynindx; | |
3171 | } | |
3172 | BFD_ASSERT (sindx != 0); | |
3173 | } | |
3174 | ||
3175 | outrel.r_info = ELF64_R_INFO (sindx, r_type); | |
3176 | outrel.r_addend = relocation + rel->r_addend; | |
3177 | } | |
3178 | } | |
3179 | ||
3180 | sreloc = elf_section_data (input_section)->sreloc; | |
3181 | ||
3182 | BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL); | |
3183 | ||
3184 | loc = sreloc->contents; | |
3185 | loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); | |
3186 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
3187 | ||
3188 | /* If this reloc is against an external symbol, we do | |
3189 | not want to fiddle with the addend. Otherwise, we | |
3190 | need to include the symbol value so that it becomes | |
3191 | an addend for the dynamic reloc. */ | |
3192 | if (! relocate) | |
3193 | continue; | |
3194 | } | |
3195 | ||
3196 | break; | |
3197 | ||
3198 | case R_X86_64_TLSGD: | |
3199 | case R_X86_64_GOTPC32_TLSDESC: | |
3200 | case R_X86_64_TLSDESC_CALL: | |
3201 | case R_X86_64_GOTTPOFF: | |
3202 | tls_type = GOT_UNKNOWN; | |
3203 | if (h == NULL && local_got_offsets) | |
3204 | tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; | |
3205 | else if (h != NULL) | |
3206 | tls_type = elf64_x86_64_hash_entry (h)->tls_type; | |
3207 | ||
3208 | if (! elf64_x86_64_tls_transition (info, input_bfd, | |
3209 | input_section, contents, | |
3210 | symtab_hdr, sym_hashes, | |
3211 | &r_type, tls_type, rel, | |
3212 | relend, h)) | |
3213 | return FALSE; | |
3214 | ||
3215 | if (r_type == R_X86_64_TPOFF32) | |
3216 | { | |
3217 | bfd_vma roff = rel->r_offset; | |
3218 | ||
3219 | BFD_ASSERT (! unresolved_reloc); | |
3220 | ||
3221 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) | |
3222 | { | |
3223 | /* GD->LE transition. | |
3224 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
3225 | .word 0x6666; rex64; call __tls_get_addr | |
3226 | Change it into: | |
3227 | movq %fs:0, %rax | |
3228 | leaq foo@tpoff(%rax), %rax */ | |
3229 | memcpy (contents + roff - 4, | |
3230 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", | |
3231 | 16); | |
3232 | bfd_put_32 (output_bfd, | |
3233 | elf64_x86_64_tpoff (info, relocation), | |
3234 | contents + roff + 8); | |
3235 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ | |
3236 | rel++; | |
3237 | continue; | |
3238 | } | |
3239 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) | |
3240 | { | |
3241 | /* GDesc -> LE transition. | |
3242 | It's originally something like: | |
3243 | leaq x@tlsdesc(%rip), %rax | |
3244 | ||
3245 | Change it to: | |
3246 | movl $x@tpoff, %rax | |
3247 | */ | |
3248 | ||
3249 | unsigned int val, type, type2; | |
3250 | ||
3251 | type = bfd_get_8 (input_bfd, contents + roff - 3); | |
3252 | type2 = bfd_get_8 (input_bfd, contents + roff - 2); | |
3253 | val = bfd_get_8 (input_bfd, contents + roff - 1); | |
3254 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), | |
3255 | contents + roff - 3); | |
3256 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); | |
3257 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), | |
3258 | contents + roff - 1); | |
3259 | bfd_put_32 (output_bfd, | |
3260 | elf64_x86_64_tpoff (info, relocation), | |
3261 | contents + roff); | |
3262 | continue; | |
3263 | } | |
3264 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) | |
3265 | { | |
3266 | /* GDesc -> LE transition. | |
3267 | It's originally: | |
3268 | call *(%rax) | |
3269 | Turn it into: | |
3270 | xchg %ax,%ax. */ | |
3271 | bfd_put_8 (output_bfd, 0x66, contents + roff); | |
3272 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); | |
3273 | continue; | |
3274 | } | |
3275 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF) | |
3276 | { | |
3277 | /* IE->LE transition: | |
3278 | Originally it can be one of: | |
3279 | movq foo@gottpoff(%rip), %reg | |
3280 | addq foo@gottpoff(%rip), %reg | |
3281 | We change it into: | |
3282 | movq $foo, %reg | |
3283 | leaq foo(%reg), %reg | |
3284 | addq $foo, %reg. */ | |
3285 | ||
3286 | unsigned int val, type, reg; | |
3287 | ||
3288 | val = bfd_get_8 (input_bfd, contents + roff - 3); | |
3289 | type = bfd_get_8 (input_bfd, contents + roff - 2); | |
3290 | reg = bfd_get_8 (input_bfd, contents + roff - 1); | |
3291 | reg >>= 3; | |
3292 | if (type == 0x8b) | |
3293 | { | |
3294 | /* movq */ | |
3295 | if (val == 0x4c) | |
3296 | bfd_put_8 (output_bfd, 0x49, | |
3297 | contents + roff - 3); | |
3298 | bfd_put_8 (output_bfd, 0xc7, | |
3299 | contents + roff - 2); | |
3300 | bfd_put_8 (output_bfd, 0xc0 | reg, | |
3301 | contents + roff - 1); | |
3302 | } | |
3303 | else if (reg == 4) | |
3304 | { | |
3305 | /* addq -> addq - addressing with %rsp/%r12 is | |
3306 | special */ | |
3307 | if (val == 0x4c) | |
3308 | bfd_put_8 (output_bfd, 0x49, | |
3309 | contents + roff - 3); | |
3310 | bfd_put_8 (output_bfd, 0x81, | |
3311 | contents + roff - 2); | |
3312 | bfd_put_8 (output_bfd, 0xc0 | reg, | |
3313 | contents + roff - 1); | |
3314 | } | |
3315 | else | |
3316 | { | |
3317 | /* addq -> leaq */ | |
3318 | if (val == 0x4c) | |
3319 | bfd_put_8 (output_bfd, 0x4d, | |
3320 | contents + roff - 3); | |
3321 | bfd_put_8 (output_bfd, 0x8d, | |
3322 | contents + roff - 2); | |
3323 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), | |
3324 | contents + roff - 1); | |
3325 | } | |
3326 | bfd_put_32 (output_bfd, | |
3327 | elf64_x86_64_tpoff (info, relocation), | |
3328 | contents + roff); | |
3329 | continue; | |
3330 | } | |
3331 | else | |
3332 | BFD_ASSERT (FALSE); | |
3333 | } | |
3334 | ||
3335 | if (htab->elf.sgot == NULL) | |
3336 | abort (); | |
3337 | ||
3338 | if (h != NULL) | |
3339 | { | |
3340 | off = h->got.offset; | |
3341 | offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got; | |
3342 | } | |
3343 | else | |
3344 | { | |
3345 | if (local_got_offsets == NULL) | |
3346 | abort (); | |
3347 | ||
3348 | off = local_got_offsets[r_symndx]; | |
3349 | offplt = local_tlsdesc_gotents[r_symndx]; | |
3350 | } | |
3351 | ||
3352 | if ((off & 1) != 0) | |
3353 | off &= ~1; | |
3354 | else | |
3355 | { | |
3356 | Elf_Internal_Rela outrel; | |
3357 | bfd_byte *loc; | |
3358 | int dr_type, indx; | |
3359 | asection *sreloc; | |
3360 | ||
3361 | if (htab->elf.srelgot == NULL) | |
3362 | abort (); | |
3363 | ||
3364 | indx = h && h->dynindx != -1 ? h->dynindx : 0; | |
3365 | ||
3366 | if (GOT_TLS_GDESC_P (tls_type)) | |
3367 | { | |
3368 | outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC); | |
3369 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt | |
3370 | + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); | |
3371 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma | |
3372 | + htab->elf.sgotplt->output_offset | |
3373 | + offplt | |
3374 | + htab->sgotplt_jump_table_size); | |
3375 | sreloc = htab->elf.srelplt; | |
3376 | loc = sreloc->contents; | |
3377 | loc += sreloc->reloc_count++ | |
3378 | * sizeof (Elf64_External_Rela); | |
3379 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) | |
3380 | <= sreloc->contents + sreloc->size); | |
3381 | if (indx == 0) | |
3382 | outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info); | |
3383 | else | |
3384 | outrel.r_addend = 0; | |
3385 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
3386 | } | |
3387 | ||
3388 | sreloc = htab->elf.srelgot; | |
3389 | ||
3390 | outrel.r_offset = (htab->elf.sgot->output_section->vma | |
3391 | + htab->elf.sgot->output_offset + off); | |
3392 | ||
3393 | if (GOT_TLS_GD_P (tls_type)) | |
3394 | dr_type = R_X86_64_DTPMOD64; | |
3395 | else if (GOT_TLS_GDESC_P (tls_type)) | |
3396 | goto dr_done; | |
3397 | else | |
3398 | dr_type = R_X86_64_TPOFF64; | |
3399 | ||
3400 | bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); | |
3401 | outrel.r_addend = 0; | |
3402 | if ((dr_type == R_X86_64_TPOFF64 | |
3403 | || dr_type == R_X86_64_TLSDESC) && indx == 0) | |
3404 | outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info); | |
3405 | outrel.r_info = ELF64_R_INFO (indx, dr_type); | |
3406 | ||
3407 | loc = sreloc->contents; | |
3408 | loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); | |
3409 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) | |
3410 | <= sreloc->contents + sreloc->size); | |
3411 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
3412 | ||
3413 | if (GOT_TLS_GD_P (tls_type)) | |
3414 | { | |
3415 | if (indx == 0) | |
3416 | { | |
3417 | BFD_ASSERT (! unresolved_reloc); | |
3418 | bfd_put_64 (output_bfd, | |
3419 | relocation - elf64_x86_64_dtpoff_base (info), | |
3420 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
3421 | } | |
3422 | else | |
3423 | { | |
3424 | bfd_put_64 (output_bfd, 0, | |
3425 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
3426 | outrel.r_info = ELF64_R_INFO (indx, | |
3427 | R_X86_64_DTPOFF64); | |
3428 | outrel.r_offset += GOT_ENTRY_SIZE; | |
3429 | sreloc->reloc_count++; | |
3430 | loc += sizeof (Elf64_External_Rela); | |
3431 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) | |
3432 | <= sreloc->contents + sreloc->size); | |
3433 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
3434 | } | |
3435 | } | |
3436 | ||
3437 | dr_done: | |
3438 | if (h != NULL) | |
3439 | h->got.offset |= 1; | |
3440 | else | |
3441 | local_got_offsets[r_symndx] |= 1; | |
3442 | } | |
3443 | ||
3444 | if (off >= (bfd_vma) -2 | |
3445 | && ! GOT_TLS_GDESC_P (tls_type)) | |
3446 | abort (); | |
3447 | if (r_type == ELF64_R_TYPE (rel->r_info)) | |
3448 | { | |
3449 | if (r_type == R_X86_64_GOTPC32_TLSDESC | |
3450 | || r_type == R_X86_64_TLSDESC_CALL) | |
3451 | relocation = htab->elf.sgotplt->output_section->vma | |
3452 | + htab->elf.sgotplt->output_offset | |
3453 | + offplt + htab->sgotplt_jump_table_size; | |
3454 | else | |
3455 | relocation = htab->elf.sgot->output_section->vma | |
3456 | + htab->elf.sgot->output_offset + off; | |
3457 | unresolved_reloc = FALSE; | |
3458 | } | |
3459 | else | |
3460 | { | |
3461 | bfd_vma roff = rel->r_offset; | |
3462 | ||
3463 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) | |
3464 | { | |
3465 | /* GD->IE transition. | |
3466 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
3467 | .word 0x6666; rex64; call __tls_get_addr@plt | |
3468 | Change it into: | |
3469 | movq %fs:0, %rax | |
3470 | addq foo@gottpoff(%rip), %rax */ | |
3471 | memcpy (contents + roff - 4, | |
3472 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", | |
3473 | 16); | |
3474 | ||
3475 | relocation = (htab->elf.sgot->output_section->vma | |
3476 | + htab->elf.sgot->output_offset + off | |
3477 | - roff | |
3478 | - input_section->output_section->vma | |
3479 | - input_section->output_offset | |
3480 | - 12); | |
3481 | bfd_put_32 (output_bfd, relocation, | |
3482 | contents + roff + 8); | |
3483 | /* Skip R_X86_64_PLT32. */ | |
3484 | rel++; | |
3485 | continue; | |
3486 | } | |
3487 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) | |
3488 | { | |
3489 | /* GDesc -> IE transition. | |
3490 | It's originally something like: | |
3491 | leaq x@tlsdesc(%rip), %rax | |
3492 | ||
3493 | Change it to: | |
3494 | movq x@gottpoff(%rip), %rax # before xchg %ax,%ax | |
3495 | */ | |
3496 | ||
3497 | unsigned int val, type, type2; | |
3498 | ||
3499 | type = bfd_get_8 (input_bfd, contents + roff - 3); | |
3500 | type2 = bfd_get_8 (input_bfd, contents + roff - 2); | |
3501 | val = bfd_get_8 (input_bfd, contents + roff - 1); | |
3502 | ||
3503 | /* Now modify the instruction as appropriate. To | |
3504 | turn a leaq into a movq in the form we use it, it | |
3505 | suffices to change the second byte from 0x8d to | |
3506 | 0x8b. */ | |
3507 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); | |
3508 | ||
3509 | bfd_put_32 (output_bfd, | |
3510 | htab->elf.sgot->output_section->vma | |
3511 | + htab->elf.sgot->output_offset + off | |
3512 | - rel->r_offset | |
3513 | - input_section->output_section->vma | |
3514 | - input_section->output_offset | |
3515 | - 4, | |
3516 | contents + roff); | |
3517 | continue; | |
3518 | } | |
3519 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) | |
3520 | { | |
3521 | /* GDesc -> IE transition. | |
3522 | It's originally: | |
3523 | call *(%rax) | |
3524 | ||
3525 | Change it to: | |
3526 | xchg %ax,%ax. */ | |
3527 | ||
3528 | unsigned int val, type; | |
3529 | ||
3530 | type = bfd_get_8 (input_bfd, contents + roff); | |
3531 | val = bfd_get_8 (input_bfd, contents + roff + 1); | |
3532 | bfd_put_8 (output_bfd, 0x66, contents + roff); | |
3533 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); | |
3534 | continue; | |
3535 | } | |
3536 | else | |
3537 | BFD_ASSERT (FALSE); | |
3538 | } | |
3539 | break; | |
3540 | ||
3541 | case R_X86_64_TLSLD: | |
3542 | if (! elf64_x86_64_tls_transition (info, input_bfd, | |
3543 | input_section, contents, | |
3544 | symtab_hdr, sym_hashes, | |
3545 | &r_type, GOT_UNKNOWN, | |
3546 | rel, relend, h)) | |
3547 | return FALSE; | |
3548 | ||
3549 | if (r_type != R_X86_64_TLSLD) | |
3550 | { | |
3551 | /* LD->LE transition: | |
3552 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr. | |
3553 | We change it into: | |
3554 | .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ | |
3555 | ||
3556 | BFD_ASSERT (r_type == R_X86_64_TPOFF32); | |
3557 | memcpy (contents + rel->r_offset - 3, | |
3558 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); | |
3559 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ | |
3560 | rel++; | |
3561 | continue; | |
3562 | } | |
3563 | ||
3564 | if (htab->elf.sgot == NULL) | |
3565 | abort (); | |
3566 | ||
3567 | off = htab->tls_ld_got.offset; | |
3568 | if (off & 1) | |
3569 | off &= ~1; | |
3570 | else | |
3571 | { | |
3572 | Elf_Internal_Rela outrel; | |
3573 | bfd_byte *loc; | |
3574 | ||
3575 | if (htab->elf.srelgot == NULL) | |
3576 | abort (); | |
3577 | ||
3578 | outrel.r_offset = (htab->elf.sgot->output_section->vma | |
3579 | + htab->elf.sgot->output_offset + off); | |
3580 | ||
3581 | bfd_put_64 (output_bfd, 0, | |
3582 | htab->elf.sgot->contents + off); | |
3583 | bfd_put_64 (output_bfd, 0, | |
3584 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
3585 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); | |
3586 | outrel.r_addend = 0; | |
3587 | loc = htab->elf.srelgot->contents; | |
3588 | loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela); | |
3589 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
3590 | htab->tls_ld_got.offset |= 1; | |
3591 | } | |
3592 | relocation = htab->elf.sgot->output_section->vma | |
3593 | + htab->elf.sgot->output_offset + off; | |
3594 | unresolved_reloc = FALSE; | |
3595 | break; | |
3596 | ||
3597 | case R_X86_64_DTPOFF32: | |
3598 | if (info->shared || (input_section->flags & SEC_CODE) == 0) | |
3599 | relocation -= elf64_x86_64_dtpoff_base (info); | |
3600 | else | |
3601 | relocation = elf64_x86_64_tpoff (info, relocation); | |
3602 | break; | |
3603 | ||
3604 | case R_X86_64_TPOFF32: | |
3605 | BFD_ASSERT (! info->shared); | |
3606 | relocation = elf64_x86_64_tpoff (info, relocation); | |
3607 | break; | |
3608 | ||
3609 | default: | |
3610 | break; | |
3611 | } | |
3612 | ||
3613 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections | |
3614 | because such sections are not SEC_ALLOC and thus ld.so will | |
3615 | not process them. */ | |
3616 | if (unresolved_reloc | |
3617 | && !((input_section->flags & SEC_DEBUGGING) != 0 | |
3618 | && h->def_dynamic)) | |
3619 | (*_bfd_error_handler) | |
3620 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), | |
3621 | input_bfd, | |
3622 | input_section, | |
3623 | (long) rel->r_offset, | |
3624 | howto->name, | |
3625 | h->root.root.string); | |
3626 | ||
3627 | do_relocation: | |
3628 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
3629 | contents, rel->r_offset, | |
3630 | relocation, rel->r_addend); | |
3631 | ||
3632 | if (r != bfd_reloc_ok) | |
3633 | { | |
3634 | const char *name; | |
3635 | ||
3636 | if (h != NULL) | |
3637 | name = h->root.root.string; | |
3638 | else | |
3639 | { | |
3640 | name = bfd_elf_string_from_elf_section (input_bfd, | |
3641 | symtab_hdr->sh_link, | |
3642 | sym->st_name); | |
3643 | if (name == NULL) | |
3644 | return FALSE; | |
3645 | if (*name == '\0') | |
3646 | name = bfd_section_name (input_bfd, sec); | |
3647 | } | |
3648 | ||
3649 | if (r == bfd_reloc_overflow) | |
3650 | { | |
3651 | if (! ((*info->callbacks->reloc_overflow) | |
3652 | (info, (h ? &h->root : NULL), name, howto->name, | |
3653 | (bfd_vma) 0, input_bfd, input_section, | |
3654 | rel->r_offset))) | |
3655 | return FALSE; | |
3656 | } | |
3657 | else | |
3658 | { | |
3659 | (*_bfd_error_handler) | |
3660 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), | |
3661 | input_bfd, input_section, | |
3662 | (long) rel->r_offset, name, (int) r); | |
3663 | return FALSE; | |
3664 | } | |
3665 | } | |
3666 | } | |
3667 | ||
3668 | return TRUE; | |
3669 | } | |
3670 | ||
3671 | /* Finish up dynamic symbol handling. We set the contents of various | |
3672 | dynamic sections here. */ | |
3673 | ||
3674 | static bfd_boolean | |
3675 | elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, | |
3676 | struct bfd_link_info *info, | |
3677 | struct elf_link_hash_entry *h, | |
3678 | Elf_Internal_Sym *sym) | |
3679 | { | |
3680 | struct elf64_x86_64_link_hash_table *htab; | |
3681 | ||
3682 | htab = elf64_x86_64_hash_table (info); | |
3683 | ||
3684 | if (h->plt.offset != (bfd_vma) -1) | |
3685 | { | |
3686 | bfd_vma plt_index; | |
3687 | bfd_vma got_offset; | |
3688 | Elf_Internal_Rela rela; | |
3689 | bfd_byte *loc; | |
3690 | asection *plt, *gotplt, *relplt; | |
3691 | ||
3692 | /* When building a static executable, use .iplt, .igot.plt and | |
3693 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ | |
3694 | if (htab->elf.splt != NULL) | |
3695 | { | |
3696 | plt = htab->elf.splt; | |
3697 | gotplt = htab->elf.sgotplt; | |
3698 | relplt = htab->elf.srelplt; | |
3699 | } | |
3700 | else | |
3701 | { | |
3702 | plt = htab->elf.iplt; | |
3703 | gotplt = htab->elf.igotplt; | |
3704 | relplt = htab->elf.irelplt; | |
3705 | } | |
3706 | ||
3707 | /* This symbol has an entry in the procedure linkage table. Set | |
3708 | it up. */ | |
3709 | if ((h->dynindx == -1 | |
3710 | && !((h->forced_local || info->executable) | |
3711 | && h->def_regular | |
3712 | && h->type == STT_GNU_IFUNC)) | |
3713 | || plt == NULL | |
3714 | || gotplt == NULL | |
3715 | || relplt == NULL) | |
3716 | abort (); | |
3717 | ||
3718 | /* Get the index in the procedure linkage table which | |
3719 | corresponds to this symbol. This is the index of this symbol | |
3720 | in all the symbols for which we are making plt entries. The | |
3721 | first entry in the procedure linkage table is reserved. | |
3722 | ||
3723 | Get the offset into the .got table of the entry that | |
3724 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE | |
3725 | bytes. The first three are reserved for the dynamic linker. | |
3726 | ||
3727 | For static executables, we don't reserve anything. */ | |
3728 | ||
3729 | if (plt == htab->elf.splt) | |
3730 | { | |
3731 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
3732 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; | |
3733 | } | |
3734 | else | |
3735 | { | |
3736 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; | |
3737 | got_offset = plt_index * GOT_ENTRY_SIZE; | |
3738 | } | |
3739 | ||
3740 | /* Fill in the entry in the procedure linkage table. */ | |
3741 | memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry, | |
3742 | PLT_ENTRY_SIZE); | |
3743 | ||
3744 | /* Insert the relocation positions of the plt section. The magic | |
3745 | numbers at the end of the statements are the positions of the | |
3746 | relocations in the plt section. */ | |
3747 | /* Put offset for jmp *name@GOTPCREL(%rip), since the | |
3748 | instruction uses 6 bytes, subtract this value. */ | |
3749 | bfd_put_32 (output_bfd, | |
3750 | (gotplt->output_section->vma | |
3751 | + gotplt->output_offset | |
3752 | + got_offset | |
3753 | - plt->output_section->vma | |
3754 | - plt->output_offset | |
3755 | - h->plt.offset | |
3756 | - 6), | |
3757 | plt->contents + h->plt.offset + 2); | |
3758 | ||
3759 | /* Don't fill PLT entry for static executables. */ | |
3760 | if (plt == htab->elf.splt) | |
3761 | { | |
3762 | /* Put relocation index. */ | |
3763 | bfd_put_32 (output_bfd, plt_index, | |
3764 | plt->contents + h->plt.offset + 7); | |
3765 | /* Put offset for jmp .PLT0. */ | |
3766 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), | |
3767 | plt->contents + h->plt.offset + 12); | |
3768 | } | |
3769 | ||
3770 | /* Fill in the entry in the global offset table, initially this | |
3771 | points to the pushq instruction in the PLT which is at offset 6. */ | |
3772 | bfd_put_64 (output_bfd, (plt->output_section->vma | |
3773 | + plt->output_offset | |
3774 | + h->plt.offset + 6), | |
3775 | gotplt->contents + got_offset); | |
3776 | ||
3777 | /* Fill in the entry in the .rela.plt section. */ | |
3778 | rela.r_offset = (gotplt->output_section->vma | |
3779 | + gotplt->output_offset | |
3780 | + got_offset); | |
3781 | if (h->dynindx == -1 | |
3782 | || ((info->executable | |
3783 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
3784 | && h->def_regular | |
3785 | && h->type == STT_GNU_IFUNC)) | |
3786 | { | |
3787 | /* If an STT_GNU_IFUNC symbol is locally defined, generate | |
3788 | R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ | |
3789 | rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE); | |
3790 | rela.r_addend = (h->root.u.def.value | |
3791 | + h->root.u.def.section->output_section->vma | |
3792 | + h->root.u.def.section->output_offset); | |
3793 | } | |
3794 | else | |
3795 | { | |
3796 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); | |
3797 | rela.r_addend = 0; | |
3798 | } | |
3799 | loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela); | |
3800 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
3801 | ||
3802 | if (!h->def_regular) | |
3803 | { | |
3804 | /* Mark the symbol as undefined, rather than as defined in | |
3805 | the .plt section. Leave the value if there were any | |
3806 | relocations where pointer equality matters (this is a clue | |
3807 | for the dynamic linker, to make function pointer | |
3808 | comparisons work between an application and shared | |
3809 | library), otherwise set it to zero. If a function is only | |
3810 | called from a binary, there is no need to slow down | |
3811 | shared libraries because of that. */ | |
3812 | sym->st_shndx = SHN_UNDEF; | |
3813 | if (!h->pointer_equality_needed) | |
3814 | sym->st_value = 0; | |
3815 | } | |
3816 | } | |
3817 | ||
3818 | if (h->got.offset != (bfd_vma) -1 | |
3819 | && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type) | |
3820 | && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) | |
3821 | { | |
3822 | Elf_Internal_Rela rela; | |
3823 | bfd_byte *loc; | |
3824 | ||
3825 | /* This symbol has an entry in the global offset table. Set it | |
3826 | up. */ | |
3827 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) | |
3828 | abort (); | |
3829 | ||
3830 | rela.r_offset = (htab->elf.sgot->output_section->vma | |
3831 | + htab->elf.sgot->output_offset | |
3832 | + (h->got.offset &~ (bfd_vma) 1)); | |
3833 | ||
3834 | /* If this is a static link, or it is a -Bsymbolic link and the | |
3835 | symbol is defined locally or was forced to be local because | |
3836 | of a version file, we just want to emit a RELATIVE reloc. | |
3837 | The entry in the global offset table will already have been | |
3838 | initialized in the relocate_section function. */ | |
3839 | if (h->def_regular | |
3840 | && h->type == STT_GNU_IFUNC) | |
3841 | { | |
3842 | if (info->shared) | |
3843 | { | |
3844 | /* Generate R_X86_64_GLOB_DAT. */ | |
3845 | goto do_glob_dat; | |
3846 | } | |
3847 | else | |
3848 | { | |
3849 | if (!h->pointer_equality_needed) | |
3850 | abort (); | |
3851 | ||
3852 | /* For non-shared object, we can't use .got.plt, which | |
3853 | contains the real function addres if we need pointer | |
3854 | equality. We load the GOT entry with the PLT entry. */ | |
3855 | asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
3856 | bfd_put_64 (output_bfd, (plt->output_section->vma | |
3857 | + plt->output_offset | |
3858 | + h->plt.offset), | |
3859 | htab->elf.sgot->contents + h->got.offset); | |
3860 | return TRUE; | |
3861 | } | |
3862 | } | |
3863 | else if (info->shared | |
3864 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
3865 | { | |
3866 | if (!h->def_regular) | |
3867 | return FALSE; | |
3868 | BFD_ASSERT((h->got.offset & 1) != 0); | |
3869 | rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); | |
3870 | rela.r_addend = (h->root.u.def.value | |
3871 | + h->root.u.def.section->output_section->vma | |
3872 | + h->root.u.def.section->output_offset); | |
3873 | } | |
3874 | else | |
3875 | { | |
3876 | BFD_ASSERT((h->got.offset & 1) == 0); | |
3877 | do_glob_dat: | |
3878 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
3879 | htab->elf.sgot->contents + h->got.offset); | |
3880 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); | |
3881 | rela.r_addend = 0; | |
3882 | } | |
3883 | ||
3884 | loc = htab->elf.srelgot->contents; | |
3885 | loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela); | |
3886 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
3887 | } | |
3888 | ||
3889 | if (h->needs_copy) | |
3890 | { | |
3891 | Elf_Internal_Rela rela; | |
3892 | bfd_byte *loc; | |
3893 | ||
3894 | /* This symbol needs a copy reloc. Set it up. */ | |
3895 | ||
3896 | if (h->dynindx == -1 | |
3897 | || (h->root.type != bfd_link_hash_defined | |
3898 | && h->root.type != bfd_link_hash_defweak) | |
3899 | || htab->srelbss == NULL) | |
3900 | abort (); | |
3901 | ||
3902 | rela.r_offset = (h->root.u.def.value | |
3903 | + h->root.u.def.section->output_section->vma | |
3904 | + h->root.u.def.section->output_offset); | |
3905 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); | |
3906 | rela.r_addend = 0; | |
3907 | loc = htab->srelbss->contents; | |
3908 | loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); | |
3909 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
3910 | } | |
3911 | ||
3912 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may | |
3913 | be NULL for local symbols. */ | |
3914 | if (sym != NULL | |
3915 | && (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
3916 | || h == htab->elf.hgot)) | |
3917 | sym->st_shndx = SHN_ABS; | |
3918 | ||
3919 | return TRUE; | |
3920 | } | |
3921 | ||
3922 | /* Finish up local dynamic symbol handling. We set the contents of | |
3923 | various dynamic sections here. */ | |
3924 | ||
3925 | static bfd_boolean | |
3926 | elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) | |
3927 | { | |
3928 | struct elf_link_hash_entry *h | |
3929 | = (struct elf_link_hash_entry *) *slot; | |
3930 | struct bfd_link_info *info | |
3931 | = (struct bfd_link_info *) inf; | |
3932 | ||
3933 | return elf64_x86_64_finish_dynamic_symbol (info->output_bfd, | |
3934 | info, h, NULL); | |
3935 | } | |
3936 | ||
3937 | /* Used to decide how to sort relocs in an optimal manner for the | |
3938 | dynamic linker, before writing them out. */ | |
3939 | ||
3940 | static enum elf_reloc_type_class | |
3941 | elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) | |
3942 | { | |
3943 | switch ((int) ELF64_R_TYPE (rela->r_info)) | |
3944 | { | |
3945 | case R_X86_64_RELATIVE: | |
3946 | return reloc_class_relative; | |
3947 | case R_X86_64_JUMP_SLOT: | |
3948 | return reloc_class_plt; | |
3949 | case R_X86_64_COPY: | |
3950 | return reloc_class_copy; | |
3951 | default: | |
3952 | return reloc_class_normal; | |
3953 | } | |
3954 | } | |
3955 | ||
3956 | /* Finish up the dynamic sections. */ | |
3957 | ||
3958 | static bfd_boolean | |
3959 | elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) | |
3960 | { | |
3961 | struct elf64_x86_64_link_hash_table *htab; | |
3962 | bfd *dynobj; | |
3963 | asection *sdyn; | |
3964 | ||
3965 | htab = elf64_x86_64_hash_table (info); | |
3966 | dynobj = htab->elf.dynobj; | |
3967 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3968 | ||
3969 | if (htab->elf.dynamic_sections_created) | |
3970 | { | |
3971 | Elf64_External_Dyn *dyncon, *dynconend; | |
3972 | ||
3973 | if (sdyn == NULL || htab->elf.sgot == NULL) | |
3974 | abort (); | |
3975 | ||
3976 | dyncon = (Elf64_External_Dyn *) sdyn->contents; | |
3977 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); | |
3978 | for (; dyncon < dynconend; dyncon++) | |
3979 | { | |
3980 | Elf_Internal_Dyn dyn; | |
3981 | asection *s; | |
3982 | ||
3983 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); | |
3984 | ||
3985 | switch (dyn.d_tag) | |
3986 | { | |
3987 | default: | |
3988 | continue; | |
3989 | ||
3990 | case DT_PLTGOT: | |
3991 | s = htab->elf.sgotplt; | |
3992 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
3993 | break; | |
3994 | ||
3995 | case DT_JMPREL: | |
3996 | dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; | |
3997 | break; | |
3998 | ||
3999 | case DT_PLTRELSZ: | |
4000 | s = htab->elf.srelplt->output_section; | |
4001 | dyn.d_un.d_val = s->size; | |
4002 | break; | |
4003 | ||
4004 | case DT_RELASZ: | |
4005 | /* The procedure linkage table relocs (DT_JMPREL) should | |
4006 | not be included in the overall relocs (DT_RELA). | |
4007 | Therefore, we override the DT_RELASZ entry here to | |
4008 | make it not include the JMPREL relocs. Since the | |
4009 | linker script arranges for .rela.plt to follow all | |
4010 | other relocation sections, we don't have to worry | |
4011 | about changing the DT_RELA entry. */ | |
4012 | if (htab->elf.srelplt != NULL) | |
4013 | { | |
4014 | s = htab->elf.srelplt->output_section; | |
4015 | dyn.d_un.d_val -= s->size; | |
4016 | } | |
4017 | break; | |
4018 | ||
4019 | case DT_TLSDESC_PLT: | |
4020 | s = htab->elf.splt; | |
4021 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
4022 | + htab->tlsdesc_plt; | |
4023 | break; | |
4024 | ||
4025 | case DT_TLSDESC_GOT: | |
4026 | s = htab->elf.sgot; | |
4027 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
4028 | + htab->tlsdesc_got; | |
4029 | break; | |
4030 | } | |
4031 | ||
4032 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
4033 | } | |
4034 | ||
4035 | /* Fill in the special first entry in the procedure linkage table. */ | |
4036 | if (htab->elf.splt && htab->elf.splt->size > 0) | |
4037 | { | |
4038 | /* Fill in the first entry in the procedure linkage table. */ | |
4039 | memcpy (htab->elf.splt->contents, elf64_x86_64_plt0_entry, | |
4040 | PLT_ENTRY_SIZE); | |
4041 | /* Add offset for pushq GOT+8(%rip), since the instruction | |
4042 | uses 6 bytes subtract this value. */ | |
4043 | bfd_put_32 (output_bfd, | |
4044 | (htab->elf.sgotplt->output_section->vma | |
4045 | + htab->elf.sgotplt->output_offset | |
4046 | + 8 | |
4047 | - htab->elf.splt->output_section->vma | |
4048 | - htab->elf.splt->output_offset | |
4049 | - 6), | |
4050 | htab->elf.splt->contents + 2); | |
4051 | /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to | |
4052 | the end of the instruction. */ | |
4053 | bfd_put_32 (output_bfd, | |
4054 | (htab->elf.sgotplt->output_section->vma | |
4055 | + htab->elf.sgotplt->output_offset | |
4056 | + 16 | |
4057 | - htab->elf.splt->output_section->vma | |
4058 | - htab->elf.splt->output_offset | |
4059 | - 12), | |
4060 | htab->elf.splt->contents + 8); | |
4061 | ||
4062 | elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize = | |
4063 | PLT_ENTRY_SIZE; | |
4064 | ||
4065 | if (htab->tlsdesc_plt) | |
4066 | { | |
4067 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
4068 | htab->elf.sgot->contents + htab->tlsdesc_got); | |
4069 | ||
4070 | memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, | |
4071 | elf64_x86_64_plt0_entry, | |
4072 | PLT_ENTRY_SIZE); | |
4073 | ||
4074 | /* Add offset for pushq GOT+8(%rip), since the | |
4075 | instruction uses 6 bytes subtract this value. */ | |
4076 | bfd_put_32 (output_bfd, | |
4077 | (htab->elf.sgotplt->output_section->vma | |
4078 | + htab->elf.sgotplt->output_offset | |
4079 | + 8 | |
4080 | - htab->elf.splt->output_section->vma | |
4081 | - htab->elf.splt->output_offset | |
4082 | - htab->tlsdesc_plt | |
4083 | - 6), | |
4084 | htab->elf.splt->contents + htab->tlsdesc_plt + 2); | |
4085 | /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for | |
4086 | htab->tlsdesc_got. The 12 is the offset to the end of | |
4087 | the instruction. */ | |
4088 | bfd_put_32 (output_bfd, | |
4089 | (htab->elf.sgot->output_section->vma | |
4090 | + htab->elf.sgot->output_offset | |
4091 | + htab->tlsdesc_got | |
4092 | - htab->elf.splt->output_section->vma | |
4093 | - htab->elf.splt->output_offset | |
4094 | - htab->tlsdesc_plt | |
4095 | - 12), | |
4096 | htab->elf.splt->contents + htab->tlsdesc_plt + 8); | |
4097 | } | |
4098 | } | |
4099 | } | |
4100 | ||
4101 | if (htab->elf.sgotplt) | |
4102 | { | |
4103 | /* Fill in the first three entries in the global offset table. */ | |
4104 | if (htab->elf.sgotplt->size > 0) | |
4105 | { | |
4106 | /* Set the first entry in the global offset table to the address of | |
4107 | the dynamic section. */ | |
4108 | if (sdyn == NULL) | |
4109 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents); | |
4110 | else | |
4111 | bfd_put_64 (output_bfd, | |
4112 | sdyn->output_section->vma + sdyn->output_offset, | |
4113 | htab->elf.sgotplt->contents); | |
4114 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ | |
4115 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); | |
4116 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2); | |
4117 | } | |
4118 | ||
4119 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = | |
4120 | GOT_ENTRY_SIZE; | |
4121 | } | |
4122 | ||
4123 | if (htab->elf.sgot && htab->elf.sgot->size > 0) | |
4124 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize | |
4125 | = GOT_ENTRY_SIZE; | |
4126 | ||
4127 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ | |
4128 | htab_traverse (htab->loc_hash_table, | |
4129 | elf64_x86_64_finish_local_dynamic_symbol, | |
4130 | info); | |
4131 | ||
4132 | return TRUE; | |
4133 | } | |
4134 | ||
4135 | /* Return address for Ith PLT stub in section PLT, for relocation REL | |
4136 | or (bfd_vma) -1 if it should not be included. */ | |
4137 | ||
4138 | static bfd_vma | |
4139 | elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt, | |
4140 | const arelent *rel ATTRIBUTE_UNUSED) | |
4141 | { | |
4142 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; | |
4143 | } | |
4144 | ||
4145 | /* Handle an x86-64 specific section when reading an object file. This | |
4146 | is called when elfcode.h finds a section with an unknown type. */ | |
4147 | ||
4148 | static bfd_boolean | |
4149 | elf64_x86_64_section_from_shdr (bfd *abfd, | |
4150 | Elf_Internal_Shdr *hdr, | |
4151 | const char *name, | |
4152 | int shindex) | |
4153 | { | |
4154 | if (hdr->sh_type != SHT_X86_64_UNWIND) | |
4155 | return FALSE; | |
4156 | ||
4157 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) | |
4158 | return FALSE; | |
4159 | ||
4160 | return TRUE; | |
4161 | } | |
4162 | ||
4163 | /* Hook called by the linker routine which adds symbols from an object | |
4164 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead | |
4165 | of .bss. */ | |
4166 | ||
4167 | static bfd_boolean | |
4168 | elf64_x86_64_add_symbol_hook (bfd *abfd, | |
4169 | struct bfd_link_info *info, | |
4170 | Elf_Internal_Sym *sym, | |
4171 | const char **namep ATTRIBUTE_UNUSED, | |
4172 | flagword *flagsp ATTRIBUTE_UNUSED, | |
4173 | asection **secp, | |
4174 | bfd_vma *valp) | |
4175 | { | |
4176 | asection *lcomm; | |
4177 | ||
4178 | switch (sym->st_shndx) | |
4179 | { | |
4180 | case SHN_X86_64_LCOMMON: | |
4181 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); | |
4182 | if (lcomm == NULL) | |
4183 | { | |
4184 | lcomm = bfd_make_section_with_flags (abfd, | |
4185 | "LARGE_COMMON", | |
4186 | (SEC_ALLOC | |
4187 | | SEC_IS_COMMON | |
4188 | | SEC_LINKER_CREATED)); | |
4189 | if (lcomm == NULL) | |
4190 | return FALSE; | |
4191 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; | |
4192 | } | |
4193 | *secp = lcomm; | |
4194 | *valp = sym->st_size; | |
4195 | break; | |
4196 | } | |
4197 | ||
4198 | if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) | |
4199 | elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE; | |
4200 | ||
4201 | return TRUE; | |
4202 | } | |
4203 | ||
4204 | ||
4205 | /* Given a BFD section, try to locate the corresponding ELF section | |
4206 | index. */ | |
4207 | ||
4208 | static bfd_boolean | |
4209 | elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, | |
4210 | asection *sec, int *index) | |
4211 | { | |
4212 | if (sec == &_bfd_elf_large_com_section) | |
4213 | { | |
4214 | *index = SHN_X86_64_LCOMMON; | |
4215 | return TRUE; | |
4216 | } | |
4217 | return FALSE; | |
4218 | } | |
4219 | ||
4220 | /* Process a symbol. */ | |
4221 | ||
4222 | static void | |
4223 | elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, | |
4224 | asymbol *asym) | |
4225 | { | |
4226 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; | |
4227 | ||
4228 | switch (elfsym->internal_elf_sym.st_shndx) | |
4229 | { | |
4230 | case SHN_X86_64_LCOMMON: | |
4231 | asym->section = &_bfd_elf_large_com_section; | |
4232 | asym->value = elfsym->internal_elf_sym.st_size; | |
4233 | /* Common symbol doesn't set BSF_GLOBAL. */ | |
4234 | asym->flags &= ~BSF_GLOBAL; | |
4235 | break; | |
4236 | } | |
4237 | } | |
4238 | ||
4239 | static bfd_boolean | |
4240 | elf64_x86_64_common_definition (Elf_Internal_Sym *sym) | |
4241 | { | |
4242 | return (sym->st_shndx == SHN_COMMON | |
4243 | || sym->st_shndx == SHN_X86_64_LCOMMON); | |
4244 | } | |
4245 | ||
4246 | static unsigned int | |
4247 | elf64_x86_64_common_section_index (asection *sec) | |
4248 | { | |
4249 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) | |
4250 | return SHN_COMMON; | |
4251 | else | |
4252 | return SHN_X86_64_LCOMMON; | |
4253 | } | |
4254 | ||
4255 | static asection * | |
4256 | elf64_x86_64_common_section (asection *sec) | |
4257 | { | |
4258 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) | |
4259 | return bfd_com_section_ptr; | |
4260 | else | |
4261 | return &_bfd_elf_large_com_section; | |
4262 | } | |
4263 | ||
4264 | static bfd_boolean | |
4265 | elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
4266 | struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, | |
4267 | struct elf_link_hash_entry *h, | |
4268 | Elf_Internal_Sym *sym, | |
4269 | asection **psec, | |
4270 | bfd_vma *pvalue ATTRIBUTE_UNUSED, | |
4271 | unsigned int *pold_alignment ATTRIBUTE_UNUSED, | |
4272 | bfd_boolean *skip ATTRIBUTE_UNUSED, | |
4273 | bfd_boolean *override ATTRIBUTE_UNUSED, | |
4274 | bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, | |
4275 | bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, | |
4276 | bfd_boolean *newdef ATTRIBUTE_UNUSED, | |
4277 | bfd_boolean *newdyn, | |
4278 | bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, | |
4279 | bfd_boolean *newweak ATTRIBUTE_UNUSED, | |
4280 | bfd *abfd ATTRIBUTE_UNUSED, | |
4281 | asection **sec, | |
4282 | bfd_boolean *olddef ATTRIBUTE_UNUSED, | |
4283 | bfd_boolean *olddyn, | |
4284 | bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, | |
4285 | bfd_boolean *oldweak ATTRIBUTE_UNUSED, | |
4286 | bfd *oldbfd, | |
4287 | asection **oldsec) | |
4288 | { | |
4289 | /* A normal common symbol and a large common symbol result in a | |
4290 | normal common symbol. We turn the large common symbol into a | |
4291 | normal one. */ | |
4292 | if (!*olddyn | |
4293 | && h->root.type == bfd_link_hash_common | |
4294 | && !*newdyn | |
4295 | && bfd_is_com_section (*sec) | |
4296 | && *oldsec != *sec) | |
4297 | { | |
4298 | if (sym->st_shndx == SHN_COMMON | |
4299 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) | |
4300 | { | |
4301 | h->root.u.c.p->section | |
4302 | = bfd_make_section_old_way (oldbfd, "COMMON"); | |
4303 | h->root.u.c.p->section->flags = SEC_ALLOC; | |
4304 | } | |
4305 | else if (sym->st_shndx == SHN_X86_64_LCOMMON | |
4306 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) | |
4307 | *psec = *sec = bfd_com_section_ptr; | |
4308 | } | |
4309 | ||
4310 | return TRUE; | |
4311 | } | |
4312 | ||
4313 | static int | |
4314 | elf64_x86_64_additional_program_headers (bfd *abfd, | |
4315 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
4316 | { | |
4317 | asection *s; | |
4318 | int count = 0; | |
4319 | ||
4320 | /* Check to see if we need a large readonly segment. */ | |
4321 | s = bfd_get_section_by_name (abfd, ".lrodata"); | |
4322 | if (s && (s->flags & SEC_LOAD)) | |
4323 | count++; | |
4324 | ||
4325 | /* Check to see if we need a large data segment. Since .lbss sections | |
4326 | is placed right after the .bss section, there should be no need for | |
4327 | a large data segment just because of .lbss. */ | |
4328 | s = bfd_get_section_by_name (abfd, ".ldata"); | |
4329 | if (s && (s->flags & SEC_LOAD)) | |
4330 | count++; | |
4331 | ||
4332 | return count; | |
4333 | } | |
4334 | ||
4335 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ | |
4336 | ||
4337 | static bfd_boolean | |
4338 | elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h) | |
4339 | { | |
4340 | if (h->plt.offset != (bfd_vma) -1 | |
4341 | && !h->def_regular | |
4342 | && !h->pointer_equality_needed) | |
4343 | return FALSE; | |
4344 | ||
4345 | return _bfd_elf_hash_symbol (h); | |
4346 | } | |
4347 | ||
4348 | static const struct bfd_elf_special_section | |
4349 | elf64_x86_64_special_sections[]= | |
4350 | { | |
4351 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
4352 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, | |
4353 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, | |
4354 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
4355 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
4356 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, | |
4357 | { NULL, 0, 0, 0, 0 } | |
4358 | }; | |
4359 | ||
4360 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec | |
4361 | #define TARGET_LITTLE_NAME "elf64-x86-64" | |
4362 | #define ELF_ARCH bfd_arch_i386 | |
4363 | #define ELF_MACHINE_CODE EM_X86_64 | |
4364 | #define ELF_MAXPAGESIZE 0x200000 | |
4365 | #define ELF_MINPAGESIZE 0x1000 | |
4366 | #define ELF_COMMONPAGESIZE 0x1000 | |
4367 | ||
4368 | #define elf_backend_can_gc_sections 1 | |
4369 | #define elf_backend_can_refcount 1 | |
4370 | #define elf_backend_want_got_plt 1 | |
4371 | #define elf_backend_plt_readonly 1 | |
4372 | #define elf_backend_want_plt_sym 0 | |
4373 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) | |
4374 | #define elf_backend_rela_normal 1 | |
4375 | ||
4376 | #define elf_info_to_howto elf64_x86_64_info_to_howto | |
4377 | ||
4378 | #define bfd_elf64_bfd_link_hash_table_create \ | |
4379 | elf64_x86_64_link_hash_table_create | |
4380 | #define bfd_elf64_bfd_link_hash_table_free \ | |
4381 | elf64_x86_64_link_hash_table_free | |
4382 | #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup | |
4383 | #define bfd_elf64_bfd_reloc_name_lookup \ | |
4384 | elf64_x86_64_reloc_name_lookup | |
4385 | ||
4386 | #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol | |
4387 | #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible | |
4388 | #define elf_backend_check_relocs elf64_x86_64_check_relocs | |
4389 | #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol | |
4390 | #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections | |
4391 | #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections | |
4392 | #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol | |
4393 | #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook | |
4394 | #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook | |
4395 | #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus | |
4396 | #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo | |
4397 | #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class | |
4398 | #define elf_backend_relocate_section elf64_x86_64_relocate_section | |
4399 | #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections | |
4400 | #define elf_backend_always_size_sections elf64_x86_64_always_size_sections | |
4401 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section | |
4402 | #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val | |
4403 | #define elf_backend_object_p elf64_x86_64_elf_object_p | |
4404 | #define bfd_elf64_mkobject elf64_x86_64_mkobject | |
4405 | ||
4406 | #define elf_backend_section_from_shdr \ | |
4407 | elf64_x86_64_section_from_shdr | |
4408 | ||
4409 | #define elf_backend_section_from_bfd_section \ | |
4410 | elf64_x86_64_elf_section_from_bfd_section | |
4411 | #define elf_backend_add_symbol_hook \ | |
4412 | elf64_x86_64_add_symbol_hook | |
4413 | #define elf_backend_symbol_processing \ | |
4414 | elf64_x86_64_symbol_processing | |
4415 | #define elf_backend_common_section_index \ | |
4416 | elf64_x86_64_common_section_index | |
4417 | #define elf_backend_common_section \ | |
4418 | elf64_x86_64_common_section | |
4419 | #define elf_backend_common_definition \ | |
4420 | elf64_x86_64_common_definition | |
4421 | #define elf_backend_merge_symbol \ | |
4422 | elf64_x86_64_merge_symbol | |
4423 | #define elf_backend_special_sections \ | |
4424 | elf64_x86_64_special_sections | |
4425 | #define elf_backend_additional_program_headers \ | |
4426 | elf64_x86_64_additional_program_headers | |
4427 | #define elf_backend_hash_symbol \ | |
4428 | elf64_x86_64_hash_symbol | |
4429 | ||
4430 | #undef elf_backend_post_process_headers | |
4431 | #define elf_backend_post_process_headers _bfd_elf_set_osabi | |
4432 | ||
4433 | #include "elf64-target.h" | |
4434 | ||
4435 | /* FreeBSD support. */ | |
4436 | ||
4437 | #undef TARGET_LITTLE_SYM | |
4438 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec | |
4439 | #undef TARGET_LITTLE_NAME | |
4440 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" | |
4441 | ||
4442 | #undef ELF_OSABI | |
4443 | #define ELF_OSABI ELFOSABI_FREEBSD | |
4444 | ||
4445 | #undef elf64_bed | |
4446 | #define elf64_bed elf64_x86_64_fbsd_bed | |
4447 | ||
4448 | #include "elf64-target.h" |