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1 | /* X86-64 specific support for ELF | |
2 | Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, | |
3 | 2010, 2011, 2012 | |
4 | Free Software Foundation, Inc. | |
5 | Contributed by Jan Hubicka <jh@suse.cz>. | |
6 | ||
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
23 | ||
24 | #include "sysdep.h" | |
25 | #include "bfd.h" | |
26 | #include "bfdlink.h" | |
27 | #include "libbfd.h" | |
28 | #include "elf-bfd.h" | |
29 | #include "elf-nacl.h" | |
30 | #include "bfd_stdint.h" | |
31 | #include "objalloc.h" | |
32 | #include "hashtab.h" | |
33 | #include "dwarf2.h" | |
34 | #include "libiberty.h" | |
35 | ||
36 | #include "elf/x86-64.h" | |
37 | ||
38 | #ifdef CORE_HEADER | |
39 | #include <stdarg.h> | |
40 | #include CORE_HEADER | |
41 | #endif | |
42 | ||
43 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ | |
44 | #define MINUS_ONE (~ (bfd_vma) 0) | |
45 | ||
46 | /* Since both 32-bit and 64-bit x86-64 encode relocation type in the | |
47 | identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get | |
48 | relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE | |
49 | since they are the same. */ | |
50 | ||
51 | #define ABI_64_P(abfd) \ | |
52 | (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) | |
53 | ||
54 | /* The relocation "howto" table. Order of fields: | |
55 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, | |
56 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ | |
57 | static reloc_howto_type x86_64_elf_howto_table[] = | |
58 | { | |
59 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, | |
60 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, | |
61 | FALSE), | |
62 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
63 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, | |
64 | FALSE), | |
65 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
66 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, | |
67 | TRUE), | |
68 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
69 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, | |
70 | FALSE), | |
71 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
72 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, | |
73 | TRUE), | |
74 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, | |
75 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, | |
76 | FALSE), | |
77 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
78 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, | |
79 | MINUS_ONE, FALSE), | |
80 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
81 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, | |
82 | MINUS_ONE, FALSE), | |
83 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
84 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, | |
85 | MINUS_ONE, FALSE), | |
86 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
87 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, | |
88 | 0xffffffff, TRUE), | |
89 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, | |
90 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, | |
91 | FALSE), | |
92 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
93 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, | |
94 | FALSE), | |
95 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, | |
96 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), | |
97 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, | |
98 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), | |
99 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, | |
100 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), | |
101 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, | |
102 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), | |
103 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
104 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, | |
105 | MINUS_ONE, FALSE), | |
106 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
107 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, | |
108 | MINUS_ONE, FALSE), | |
109 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
110 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, | |
111 | MINUS_ONE, FALSE), | |
112 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
113 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, | |
114 | 0xffffffff, TRUE), | |
115 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
116 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, | |
117 | 0xffffffff, TRUE), | |
118 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
119 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, | |
120 | 0xffffffff, FALSE), | |
121 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
122 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, | |
123 | 0xffffffff, TRUE), | |
124 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, | |
125 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, | |
126 | 0xffffffff, FALSE), | |
127 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, | |
128 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, | |
129 | TRUE), | |
130 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
131 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", | |
132 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), | |
133 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, | |
134 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", | |
135 | FALSE, 0xffffffff, 0xffffffff, TRUE), | |
136 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
137 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, | |
138 | FALSE), | |
139 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, | |
140 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, | |
141 | MINUS_ONE, TRUE), | |
142 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, | |
143 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", | |
144 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), | |
145 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
146 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, | |
147 | MINUS_ONE, FALSE), | |
148 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, | |
149 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, | |
150 | MINUS_ONE, FALSE), | |
151 | HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, | |
152 | bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff, | |
153 | FALSE), | |
154 | HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned, | |
155 | bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE, | |
156 | FALSE), | |
157 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, | |
158 | complain_overflow_bitfield, bfd_elf_generic_reloc, | |
159 | "R_X86_64_GOTPC32_TLSDESC", | |
160 | FALSE, 0xffffffff, 0xffffffff, TRUE), | |
161 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, | |
162 | complain_overflow_dont, bfd_elf_generic_reloc, | |
163 | "R_X86_64_TLSDESC_CALL", | |
164 | FALSE, 0, 0, FALSE), | |
165 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, | |
166 | complain_overflow_bitfield, bfd_elf_generic_reloc, | |
167 | "R_X86_64_TLSDESC", | |
168 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), | |
169 | HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
170 | bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, | |
171 | MINUS_ONE, FALSE), | |
172 | HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, | |
173 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE, | |
174 | MINUS_ONE, FALSE), | |
175 | ||
176 | /* We have a gap in the reloc numbers here. | |
177 | R_X86_64_standard counts the number up to this point, and | |
178 | R_X86_64_vt_offset is the value to subtract from a reloc type of | |
179 | R_X86_64_GNU_VT* to form an index into this table. */ | |
180 | #define R_X86_64_standard (R_X86_64_RELATIVE64 + 1) | |
181 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) | |
182 | ||
183 | /* GNU extension to record C++ vtable hierarchy. */ | |
184 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, | |
185 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), | |
186 | ||
187 | /* GNU extension to record C++ vtable member usage. */ | |
188 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, | |
189 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, | |
190 | FALSE), | |
191 | ||
192 | /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */ | |
193 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, | |
194 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, | |
195 | FALSE) | |
196 | }; | |
197 | ||
198 | #define IS_X86_64_PCREL_TYPE(TYPE) \ | |
199 | ( ((TYPE) == R_X86_64_PC8) \ | |
200 | || ((TYPE) == R_X86_64_PC16) \ | |
201 | || ((TYPE) == R_X86_64_PC32) \ | |
202 | || ((TYPE) == R_X86_64_PC64)) | |
203 | ||
204 | /* Map BFD relocs to the x86_64 elf relocs. */ | |
205 | struct elf_reloc_map | |
206 | { | |
207 | bfd_reloc_code_real_type bfd_reloc_val; | |
208 | unsigned char elf_reloc_val; | |
209 | }; | |
210 | ||
211 | static const struct elf_reloc_map x86_64_reloc_map[] = | |
212 | { | |
213 | { BFD_RELOC_NONE, R_X86_64_NONE, }, | |
214 | { BFD_RELOC_64, R_X86_64_64, }, | |
215 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, | |
216 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, | |
217 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, | |
218 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, | |
219 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, | |
220 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, | |
221 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, | |
222 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, | |
223 | { BFD_RELOC_32, R_X86_64_32, }, | |
224 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, | |
225 | { BFD_RELOC_16, R_X86_64_16, }, | |
226 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, | |
227 | { BFD_RELOC_8, R_X86_64_8, }, | |
228 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, | |
229 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, | |
230 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, | |
231 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, | |
232 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, | |
233 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, | |
234 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, | |
235 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, | |
236 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, | |
237 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, | |
238 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, | |
239 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, | |
240 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, | |
241 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, | |
242 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, | |
243 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, | |
244 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, | |
245 | { BFD_RELOC_SIZE32, R_X86_64_SIZE32, }, | |
246 | { BFD_RELOC_SIZE64, R_X86_64_SIZE64, }, | |
247 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, | |
248 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, | |
249 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, | |
250 | { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, | |
251 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, | |
252 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, | |
253 | }; | |
254 | ||
255 | static reloc_howto_type * | |
256 | elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) | |
257 | { | |
258 | unsigned i; | |
259 | ||
260 | if (r_type == (unsigned int) R_X86_64_32) | |
261 | { | |
262 | if (ABI_64_P (abfd)) | |
263 | i = r_type; | |
264 | else | |
265 | i = ARRAY_SIZE (x86_64_elf_howto_table) - 1; | |
266 | } | |
267 | else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT | |
268 | || r_type >= (unsigned int) R_X86_64_max) | |
269 | { | |
270 | if (r_type >= (unsigned int) R_X86_64_standard) | |
271 | { | |
272 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), | |
273 | abfd, (int) r_type); | |
274 | r_type = R_X86_64_NONE; | |
275 | } | |
276 | i = r_type; | |
277 | } | |
278 | else | |
279 | i = r_type - (unsigned int) R_X86_64_vt_offset; | |
280 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); | |
281 | return &x86_64_elf_howto_table[i]; | |
282 | } | |
283 | ||
284 | /* Given a BFD reloc type, return a HOWTO structure. */ | |
285 | static reloc_howto_type * | |
286 | elf_x86_64_reloc_type_lookup (bfd *abfd, | |
287 | bfd_reloc_code_real_type code) | |
288 | { | |
289 | unsigned int i; | |
290 | ||
291 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); | |
292 | i++) | |
293 | { | |
294 | if (x86_64_reloc_map[i].bfd_reloc_val == code) | |
295 | return elf_x86_64_rtype_to_howto (abfd, | |
296 | x86_64_reloc_map[i].elf_reloc_val); | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static reloc_howto_type * | |
302 | elf_x86_64_reloc_name_lookup (bfd *abfd, | |
303 | const char *r_name) | |
304 | { | |
305 | unsigned int i; | |
306 | ||
307 | if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0) | |
308 | { | |
309 | /* Get x32 R_X86_64_32. */ | |
310 | reloc_howto_type *reloc | |
311 | = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1]; | |
312 | BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32); | |
313 | return reloc; | |
314 | } | |
315 | ||
316 | for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++) | |
317 | if (x86_64_elf_howto_table[i].name != NULL | |
318 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) | |
319 | return &x86_64_elf_howto_table[i]; | |
320 | ||
321 | return NULL; | |
322 | } | |
323 | ||
324 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ | |
325 | ||
326 | static void | |
327 | elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, | |
328 | Elf_Internal_Rela *dst) | |
329 | { | |
330 | unsigned r_type; | |
331 | ||
332 | r_type = ELF32_R_TYPE (dst->r_info); | |
333 | cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); | |
334 | BFD_ASSERT (r_type == cache_ptr->howto->type); | |
335 | } | |
336 | \f | |
337 | /* Support for core dump NOTE sections. */ | |
338 | static bfd_boolean | |
339 | elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) | |
340 | { | |
341 | int offset; | |
342 | size_t size; | |
343 | ||
344 | switch (note->descsz) | |
345 | { | |
346 | default: | |
347 | return FALSE; | |
348 | ||
349 | case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */ | |
350 | /* pr_cursig */ | |
351 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); | |
352 | ||
353 | /* pr_pid */ | |
354 | elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24); | |
355 | ||
356 | /* pr_reg */ | |
357 | offset = 72; | |
358 | size = 216; | |
359 | ||
360 | break; | |
361 | ||
362 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ | |
363 | /* pr_cursig */ | |
364 | elf_tdata (abfd)->core_signal | |
365 | = bfd_get_16 (abfd, note->descdata + 12); | |
366 | ||
367 | /* pr_pid */ | |
368 | elf_tdata (abfd)->core_lwpid | |
369 | = bfd_get_32 (abfd, note->descdata + 32); | |
370 | ||
371 | /* pr_reg */ | |
372 | offset = 112; | |
373 | size = 216; | |
374 | ||
375 | break; | |
376 | } | |
377 | ||
378 | /* Make a ".reg/999" section. */ | |
379 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", | |
380 | size, note->descpos + offset); | |
381 | } | |
382 | ||
383 | static bfd_boolean | |
384 | elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) | |
385 | { | |
386 | switch (note->descsz) | |
387 | { | |
388 | default: | |
389 | return FALSE; | |
390 | ||
391 | case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */ | |
392 | elf_tdata (abfd)->core_pid | |
393 | = bfd_get_32 (abfd, note->descdata + 12); | |
394 | elf_tdata (abfd)->core_program | |
395 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); | |
396 | elf_tdata (abfd)->core_command | |
397 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); | |
398 | break; | |
399 | ||
400 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ | |
401 | elf_tdata (abfd)->core_pid | |
402 | = bfd_get_32 (abfd, note->descdata + 24); | |
403 | elf_tdata (abfd)->core_program | |
404 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); | |
405 | elf_tdata (abfd)->core_command | |
406 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); | |
407 | } | |
408 | ||
409 | /* Note that for some reason, a spurious space is tacked | |
410 | onto the end of the args in some (at least one anyway) | |
411 | implementations, so strip it off if it exists. */ | |
412 | ||
413 | { | |
414 | char *command = elf_tdata (abfd)->core_command; | |
415 | int n = strlen (command); | |
416 | ||
417 | if (0 < n && command[n - 1] == ' ') | |
418 | command[n - 1] = '\0'; | |
419 | } | |
420 | ||
421 | return TRUE; | |
422 | } | |
423 | ||
424 | #ifdef CORE_HEADER | |
425 | static char * | |
426 | elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz, | |
427 | int note_type, ...) | |
428 | { | |
429 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
430 | va_list ap; | |
431 | const char *fname, *psargs; | |
432 | long pid; | |
433 | int cursig; | |
434 | const void *gregs; | |
435 | ||
436 | switch (note_type) | |
437 | { | |
438 | default: | |
439 | return NULL; | |
440 | ||
441 | case NT_PRPSINFO: | |
442 | va_start (ap, note_type); | |
443 | fname = va_arg (ap, const char *); | |
444 | psargs = va_arg (ap, const char *); | |
445 | va_end (ap); | |
446 | ||
447 | if (bed->s->elfclass == ELFCLASS32) | |
448 | { | |
449 | prpsinfo32_t data; | |
450 | memset (&data, 0, sizeof (data)); | |
451 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); | |
452 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); | |
453 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, | |
454 | &data, sizeof (data)); | |
455 | } | |
456 | else | |
457 | { | |
458 | prpsinfo64_t data; | |
459 | memset (&data, 0, sizeof (data)); | |
460 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); | |
461 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); | |
462 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, | |
463 | &data, sizeof (data)); | |
464 | } | |
465 | /* NOTREACHED */ | |
466 | ||
467 | case NT_PRSTATUS: | |
468 | va_start (ap, note_type); | |
469 | pid = va_arg (ap, long); | |
470 | cursig = va_arg (ap, int); | |
471 | gregs = va_arg (ap, const void *); | |
472 | va_end (ap); | |
473 | ||
474 | if (bed->s->elfclass == ELFCLASS32) | |
475 | { | |
476 | if (bed->elf_machine_code == EM_X86_64) | |
477 | { | |
478 | prstatusx32_t prstat; | |
479 | memset (&prstat, 0, sizeof (prstat)); | |
480 | prstat.pr_pid = pid; | |
481 | prstat.pr_cursig = cursig; | |
482 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); | |
483 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, | |
484 | &prstat, sizeof (prstat)); | |
485 | } | |
486 | else | |
487 | { | |
488 | prstatus32_t prstat; | |
489 | memset (&prstat, 0, sizeof (prstat)); | |
490 | prstat.pr_pid = pid; | |
491 | prstat.pr_cursig = cursig; | |
492 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); | |
493 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, | |
494 | &prstat, sizeof (prstat)); | |
495 | } | |
496 | } | |
497 | else | |
498 | { | |
499 | prstatus64_t prstat; | |
500 | memset (&prstat, 0, sizeof (prstat)); | |
501 | prstat.pr_pid = pid; | |
502 | prstat.pr_cursig = cursig; | |
503 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); | |
504 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, | |
505 | &prstat, sizeof (prstat)); | |
506 | } | |
507 | } | |
508 | /* NOTREACHED */ | |
509 | } | |
510 | #endif | |
511 | \f | |
512 | /* Functions for the x86-64 ELF linker. */ | |
513 | ||
514 | /* The name of the dynamic interpreter. This is put in the .interp | |
515 | section. */ | |
516 | ||
517 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1" | |
518 | #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1" | |
519 | ||
520 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid | |
521 | copying dynamic variables from a shared lib into an app's dynbss | |
522 | section, and instead use a dynamic relocation to point into the | |
523 | shared lib. */ | |
524 | #define ELIMINATE_COPY_RELOCS 1 | |
525 | ||
526 | /* The size in bytes of an entry in the global offset table. */ | |
527 | ||
528 | #define GOT_ENTRY_SIZE 8 | |
529 | ||
530 | /* The size in bytes of an entry in the procedure linkage table. */ | |
531 | ||
532 | #define PLT_ENTRY_SIZE 16 | |
533 | ||
534 | /* The first entry in a procedure linkage table looks like this. See the | |
535 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ | |
536 | ||
537 | static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] = | |
538 | { | |
539 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ | |
540 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ | |
541 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ | |
542 | }; | |
543 | ||
544 | /* Subsequent entries in a procedure linkage table look like this. */ | |
545 | ||
546 | static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] = | |
547 | { | |
548 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ | |
549 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ | |
550 | 0x68, /* pushq immediate */ | |
551 | 0, 0, 0, 0, /* replaced with index into relocation table. */ | |
552 | 0xe9, /* jmp relative */ | |
553 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ | |
554 | }; | |
555 | ||
556 | /* .eh_frame covering the .plt section. */ | |
557 | ||
558 | static const bfd_byte elf_x86_64_eh_frame_plt[] = | |
559 | { | |
560 | #define PLT_CIE_LENGTH 20 | |
561 | #define PLT_FDE_LENGTH 36 | |
562 | #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 | |
563 | #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 | |
564 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ | |
565 | 0, 0, 0, 0, /* CIE ID */ | |
566 | 1, /* CIE version */ | |
567 | 'z', 'R', 0, /* Augmentation string */ | |
568 | 1, /* Code alignment factor */ | |
569 | 0x78, /* Data alignment factor */ | |
570 | 16, /* Return address column */ | |
571 | 1, /* Augmentation size */ | |
572 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ | |
573 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ | |
574 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ | |
575 | DW_CFA_nop, DW_CFA_nop, | |
576 | ||
577 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ | |
578 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ | |
579 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ | |
580 | 0, 0, 0, 0, /* .plt size goes here */ | |
581 | 0, /* Augmentation size */ | |
582 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ | |
583 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ | |
584 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ | |
585 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ | |
586 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ | |
587 | 11, /* Block length */ | |
588 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ | |
589 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ | |
590 | DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, | |
591 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, | |
592 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop | |
593 | }; | |
594 | ||
595 | /* Architecture-specific backend data for x86-64. */ | |
596 | ||
597 | struct elf_x86_64_backend_data | |
598 | { | |
599 | /* Templates for the initial PLT entry and for subsequent entries. */ | |
600 | const bfd_byte *plt0_entry; | |
601 | const bfd_byte *plt_entry; | |
602 | unsigned int plt_entry_size; /* Size of each PLT entry. */ | |
603 | ||
604 | /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */ | |
605 | unsigned int plt0_got1_offset; | |
606 | unsigned int plt0_got2_offset; | |
607 | ||
608 | /* Offset of the end of the PC-relative instruction containing | |
609 | plt0_got2_offset. */ | |
610 | unsigned int plt0_got2_insn_end; | |
611 | ||
612 | /* Offsets into plt_entry that are to be replaced with... */ | |
613 | unsigned int plt_got_offset; /* ... address of this symbol in .got. */ | |
614 | unsigned int plt_reloc_offset; /* ... offset into relocation table. */ | |
615 | unsigned int plt_plt_offset; /* ... offset to start of .plt. */ | |
616 | ||
617 | /* Length of the PC-relative instruction containing plt_got_offset. */ | |
618 | unsigned int plt_got_insn_size; | |
619 | ||
620 | /* Offset of the end of the PC-relative jump to plt0_entry. */ | |
621 | unsigned int plt_plt_insn_end; | |
622 | ||
623 | /* Offset into plt_entry where the initial value of the GOT entry points. */ | |
624 | unsigned int plt_lazy_offset; | |
625 | ||
626 | /* .eh_frame covering the .plt section. */ | |
627 | const bfd_byte *eh_frame_plt; | |
628 | unsigned int eh_frame_plt_size; | |
629 | }; | |
630 | ||
631 | #define get_elf_x86_64_backend_data(abfd) \ | |
632 | ((const struct elf_x86_64_backend_data *) \ | |
633 | get_elf_backend_data (abfd)->arch_data) | |
634 | ||
635 | #define GET_PLT_ENTRY_SIZE(abfd) \ | |
636 | get_elf_x86_64_backend_data (abfd)->plt_entry_size | |
637 | ||
638 | /* These are the standard parameters. */ | |
639 | static const struct elf_x86_64_backend_data elf_x86_64_arch_bed = | |
640 | { | |
641 | elf_x86_64_plt0_entry, /* plt0_entry */ | |
642 | elf_x86_64_plt_entry, /* plt_entry */ | |
643 | sizeof (elf_x86_64_plt_entry), /* plt_entry_size */ | |
644 | 2, /* plt0_got1_offset */ | |
645 | 8, /* plt0_got2_offset */ | |
646 | 12, /* plt0_got2_insn_end */ | |
647 | 2, /* plt_got_offset */ | |
648 | 7, /* plt_reloc_offset */ | |
649 | 12, /* plt_plt_offset */ | |
650 | 6, /* plt_got_insn_size */ | |
651 | PLT_ENTRY_SIZE, /* plt_plt_insn_end */ | |
652 | 6, /* plt_lazy_offset */ | |
653 | elf_x86_64_eh_frame_plt, /* eh_frame_plt */ | |
654 | sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */ | |
655 | }; | |
656 | ||
657 | #define elf_backend_arch_data &elf_x86_64_arch_bed | |
658 | ||
659 | /* x86-64 ELF linker hash entry. */ | |
660 | ||
661 | struct elf_x86_64_link_hash_entry | |
662 | { | |
663 | struct elf_link_hash_entry elf; | |
664 | ||
665 | /* Track dynamic relocs copied for this symbol. */ | |
666 | struct elf_dyn_relocs *dyn_relocs; | |
667 | ||
668 | #define GOT_UNKNOWN 0 | |
669 | #define GOT_NORMAL 1 | |
670 | #define GOT_TLS_GD 2 | |
671 | #define GOT_TLS_IE 3 | |
672 | #define GOT_TLS_GDESC 4 | |
673 | #define GOT_TLS_GD_BOTH_P(type) \ | |
674 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) | |
675 | #define GOT_TLS_GD_P(type) \ | |
676 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) | |
677 | #define GOT_TLS_GDESC_P(type) \ | |
678 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) | |
679 | #define GOT_TLS_GD_ANY_P(type) \ | |
680 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) | |
681 | unsigned char tls_type; | |
682 | ||
683 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, | |
684 | starting at the end of the jump table. */ | |
685 | bfd_vma tlsdesc_got; | |
686 | }; | |
687 | ||
688 | #define elf_x86_64_hash_entry(ent) \ | |
689 | ((struct elf_x86_64_link_hash_entry *)(ent)) | |
690 | ||
691 | struct elf_x86_64_obj_tdata | |
692 | { | |
693 | struct elf_obj_tdata root; | |
694 | ||
695 | /* tls_type for each local got entry. */ | |
696 | char *local_got_tls_type; | |
697 | ||
698 | /* GOTPLT entries for TLS descriptors. */ | |
699 | bfd_vma *local_tlsdesc_gotent; | |
700 | }; | |
701 | ||
702 | #define elf_x86_64_tdata(abfd) \ | |
703 | ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any) | |
704 | ||
705 | #define elf_x86_64_local_got_tls_type(abfd) \ | |
706 | (elf_x86_64_tdata (abfd)->local_got_tls_type) | |
707 | ||
708 | #define elf_x86_64_local_tlsdesc_gotent(abfd) \ | |
709 | (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent) | |
710 | ||
711 | #define is_x86_64_elf(bfd) \ | |
712 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
713 | && elf_tdata (bfd) != NULL \ | |
714 | && elf_object_id (bfd) == X86_64_ELF_DATA) | |
715 | ||
716 | static bfd_boolean | |
717 | elf_x86_64_mkobject (bfd *abfd) | |
718 | { | |
719 | return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata), | |
720 | X86_64_ELF_DATA); | |
721 | } | |
722 | ||
723 | /* x86-64 ELF linker hash table. */ | |
724 | ||
725 | struct elf_x86_64_link_hash_table | |
726 | { | |
727 | struct elf_link_hash_table elf; | |
728 | ||
729 | /* Short-cuts to get to dynamic linker sections. */ | |
730 | asection *sdynbss; | |
731 | asection *srelbss; | |
732 | asection *plt_eh_frame; | |
733 | ||
734 | union | |
735 | { | |
736 | bfd_signed_vma refcount; | |
737 | bfd_vma offset; | |
738 | } tls_ld_got; | |
739 | ||
740 | /* The amount of space used by the jump slots in the GOT. */ | |
741 | bfd_vma sgotplt_jump_table_size; | |
742 | ||
743 | /* Small local sym cache. */ | |
744 | struct sym_cache sym_cache; | |
745 | ||
746 | bfd_vma (*r_info) (bfd_vma, bfd_vma); | |
747 | bfd_vma (*r_sym) (bfd_vma); | |
748 | unsigned int pointer_r_type; | |
749 | const char *dynamic_interpreter; | |
750 | int dynamic_interpreter_size; | |
751 | ||
752 | /* _TLS_MODULE_BASE_ symbol. */ | |
753 | struct bfd_link_hash_entry *tls_module_base; | |
754 | ||
755 | /* Used by local STT_GNU_IFUNC symbols. */ | |
756 | htab_t loc_hash_table; | |
757 | void * loc_hash_memory; | |
758 | ||
759 | /* The offset into splt of the PLT entry for the TLS descriptor | |
760 | resolver. Special values are 0, if not necessary (or not found | |
761 | to be necessary yet), and -1 if needed but not determined | |
762 | yet. */ | |
763 | bfd_vma tlsdesc_plt; | |
764 | /* The offset into sgot of the GOT entry used by the PLT entry | |
765 | above. */ | |
766 | bfd_vma tlsdesc_got; | |
767 | ||
768 | /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ | |
769 | bfd_vma next_jump_slot_index; | |
770 | /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ | |
771 | bfd_vma next_irelative_index; | |
772 | }; | |
773 | ||
774 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ | |
775 | ||
776 | #define elf_x86_64_hash_table(p) \ | |
777 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ | |
778 | == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL) | |
779 | ||
780 | #define elf_x86_64_compute_jump_table_size(htab) \ | |
781 | ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE) | |
782 | ||
783 | /* Create an entry in an x86-64 ELF linker hash table. */ | |
784 | ||
785 | static struct bfd_hash_entry * | |
786 | elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry, | |
787 | struct bfd_hash_table *table, | |
788 | const char *string) | |
789 | { | |
790 | /* Allocate the structure if it has not already been allocated by a | |
791 | subclass. */ | |
792 | if (entry == NULL) | |
793 | { | |
794 | entry = (struct bfd_hash_entry *) | |
795 | bfd_hash_allocate (table, | |
796 | sizeof (struct elf_x86_64_link_hash_entry)); | |
797 | if (entry == NULL) | |
798 | return entry; | |
799 | } | |
800 | ||
801 | /* Call the allocation method of the superclass. */ | |
802 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
803 | if (entry != NULL) | |
804 | { | |
805 | struct elf_x86_64_link_hash_entry *eh; | |
806 | ||
807 | eh = (struct elf_x86_64_link_hash_entry *) entry; | |
808 | eh->dyn_relocs = NULL; | |
809 | eh->tls_type = GOT_UNKNOWN; | |
810 | eh->tlsdesc_got = (bfd_vma) -1; | |
811 | } | |
812 | ||
813 | return entry; | |
814 | } | |
815 | ||
816 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
817 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
818 | as global symbol. We reuse indx and dynstr_index for local symbol | |
819 | hash since they aren't used by global symbols in this backend. */ | |
820 | ||
821 | static hashval_t | |
822 | elf_x86_64_local_htab_hash (const void *ptr) | |
823 | { | |
824 | struct elf_link_hash_entry *h | |
825 | = (struct elf_link_hash_entry *) ptr; | |
826 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
827 | } | |
828 | ||
829 | /* Compare local hash entries. */ | |
830 | ||
831 | static int | |
832 | elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2) | |
833 | { | |
834 | struct elf_link_hash_entry *h1 | |
835 | = (struct elf_link_hash_entry *) ptr1; | |
836 | struct elf_link_hash_entry *h2 | |
837 | = (struct elf_link_hash_entry *) ptr2; | |
838 | ||
839 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
840 | } | |
841 | ||
842 | /* Find and/or create a hash entry for local symbol. */ | |
843 | ||
844 | static struct elf_link_hash_entry * | |
845 | elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab, | |
846 | bfd *abfd, const Elf_Internal_Rela *rel, | |
847 | bfd_boolean create) | |
848 | { | |
849 | struct elf_x86_64_link_hash_entry e, *ret; | |
850 | asection *sec = abfd->sections; | |
851 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
852 | htab->r_sym (rel->r_info)); | |
853 | void **slot; | |
854 | ||
855 | e.elf.indx = sec->id; | |
856 | e.elf.dynstr_index = htab->r_sym (rel->r_info); | |
857 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
858 | create ? INSERT : NO_INSERT); | |
859 | ||
860 | if (!slot) | |
861 | return NULL; | |
862 | ||
863 | if (*slot) | |
864 | { | |
865 | ret = (struct elf_x86_64_link_hash_entry *) *slot; | |
866 | return &ret->elf; | |
867 | } | |
868 | ||
869 | ret = (struct elf_x86_64_link_hash_entry *) | |
870 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
871 | sizeof (struct elf_x86_64_link_hash_entry)); | |
872 | if (ret) | |
873 | { | |
874 | memset (ret, 0, sizeof (*ret)); | |
875 | ret->elf.indx = sec->id; | |
876 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); | |
877 | ret->elf.dynindx = -1; | |
878 | *slot = ret; | |
879 | } | |
880 | return &ret->elf; | |
881 | } | |
882 | ||
883 | /* Create an X86-64 ELF linker hash table. */ | |
884 | ||
885 | static struct bfd_link_hash_table * | |
886 | elf_x86_64_link_hash_table_create (bfd *abfd) | |
887 | { | |
888 | struct elf_x86_64_link_hash_table *ret; | |
889 | bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table); | |
890 | ||
891 | ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt); | |
892 | if (ret == NULL) | |
893 | return NULL; | |
894 | ||
895 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
896 | elf_x86_64_link_hash_newfunc, | |
897 | sizeof (struct elf_x86_64_link_hash_entry), | |
898 | X86_64_ELF_DATA)) | |
899 | { | |
900 | free (ret); | |
901 | return NULL; | |
902 | } | |
903 | ||
904 | if (ABI_64_P (abfd)) | |
905 | { | |
906 | ret->r_info = elf64_r_info; | |
907 | ret->r_sym = elf64_r_sym; | |
908 | ret->pointer_r_type = R_X86_64_64; | |
909 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; | |
910 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; | |
911 | } | |
912 | else | |
913 | { | |
914 | ret->r_info = elf32_r_info; | |
915 | ret->r_sym = elf32_r_sym; | |
916 | ret->pointer_r_type = R_X86_64_32; | |
917 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; | |
918 | ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER; | |
919 | } | |
920 | ||
921 | ret->loc_hash_table = htab_try_create (1024, | |
922 | elf_x86_64_local_htab_hash, | |
923 | elf_x86_64_local_htab_eq, | |
924 | NULL); | |
925 | ret->loc_hash_memory = objalloc_create (); | |
926 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
927 | { | |
928 | free (ret); | |
929 | return NULL; | |
930 | } | |
931 | ||
932 | return &ret->elf.root; | |
933 | } | |
934 | ||
935 | /* Destroy an X86-64 ELF linker hash table. */ | |
936 | ||
937 | static void | |
938 | elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash) | |
939 | { | |
940 | struct elf_x86_64_link_hash_table *htab | |
941 | = (struct elf_x86_64_link_hash_table *) hash; | |
942 | ||
943 | if (htab->loc_hash_table) | |
944 | htab_delete (htab->loc_hash_table); | |
945 | if (htab->loc_hash_memory) | |
946 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
947 | _bfd_elf_link_hash_table_free (hash); | |
948 | } | |
949 | ||
950 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
951 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
952 | hash table. */ | |
953 | ||
954 | static bfd_boolean | |
955 | elf_x86_64_create_dynamic_sections (bfd *dynobj, | |
956 | struct bfd_link_info *info) | |
957 | { | |
958 | struct elf_x86_64_link_hash_table *htab; | |
959 | ||
960 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
961 | return FALSE; | |
962 | ||
963 | htab = elf_x86_64_hash_table (info); | |
964 | if (htab == NULL) | |
965 | return FALSE; | |
966 | ||
967 | htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); | |
968 | if (!info->shared) | |
969 | htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); | |
970 | ||
971 | if (!htab->sdynbss | |
972 | || (!info->shared && !htab->srelbss)) | |
973 | abort (); | |
974 | ||
975 | if (!info->no_ld_generated_unwind_info | |
976 | && htab->plt_eh_frame == NULL | |
977 | && htab->elf.splt != NULL) | |
978 | { | |
979 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | |
980 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
981 | | SEC_LINKER_CREATED); | |
982 | htab->plt_eh_frame | |
983 | = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags); | |
984 | if (htab->plt_eh_frame == NULL | |
985 | || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3)) | |
986 | return FALSE; | |
987 | } | |
988 | return TRUE; | |
989 | } | |
990 | ||
991 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
992 | ||
993 | static void | |
994 | elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info, | |
995 | struct elf_link_hash_entry *dir, | |
996 | struct elf_link_hash_entry *ind) | |
997 | { | |
998 | struct elf_x86_64_link_hash_entry *edir, *eind; | |
999 | ||
1000 | edir = (struct elf_x86_64_link_hash_entry *) dir; | |
1001 | eind = (struct elf_x86_64_link_hash_entry *) ind; | |
1002 | ||
1003 | if (eind->dyn_relocs != NULL) | |
1004 | { | |
1005 | if (edir->dyn_relocs != NULL) | |
1006 | { | |
1007 | struct elf_dyn_relocs **pp; | |
1008 | struct elf_dyn_relocs *p; | |
1009 | ||
1010 | /* Add reloc counts against the indirect sym to the direct sym | |
1011 | list. Merge any entries against the same section. */ | |
1012 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
1013 | { | |
1014 | struct elf_dyn_relocs *q; | |
1015 | ||
1016 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
1017 | if (q->sec == p->sec) | |
1018 | { | |
1019 | q->pc_count += p->pc_count; | |
1020 | q->count += p->count; | |
1021 | *pp = p->next; | |
1022 | break; | |
1023 | } | |
1024 | if (q == NULL) | |
1025 | pp = &p->next; | |
1026 | } | |
1027 | *pp = edir->dyn_relocs; | |
1028 | } | |
1029 | ||
1030 | edir->dyn_relocs = eind->dyn_relocs; | |
1031 | eind->dyn_relocs = NULL; | |
1032 | } | |
1033 | ||
1034 | if (ind->root.type == bfd_link_hash_indirect | |
1035 | && dir->got.refcount <= 0) | |
1036 | { | |
1037 | edir->tls_type = eind->tls_type; | |
1038 | eind->tls_type = GOT_UNKNOWN; | |
1039 | } | |
1040 | ||
1041 | if (ELIMINATE_COPY_RELOCS | |
1042 | && ind->root.type != bfd_link_hash_indirect | |
1043 | && dir->dynamic_adjusted) | |
1044 | { | |
1045 | /* If called to transfer flags for a weakdef during processing | |
1046 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
1047 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
1048 | dir->ref_dynamic |= ind->ref_dynamic; | |
1049 | dir->ref_regular |= ind->ref_regular; | |
1050 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
1051 | dir->needs_plt |= ind->needs_plt; | |
1052 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
1053 | } | |
1054 | else | |
1055 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
1056 | } | |
1057 | ||
1058 | static bfd_boolean | |
1059 | elf64_x86_64_elf_object_p (bfd *abfd) | |
1060 | { | |
1061 | /* Set the right machine number for an x86-64 elf64 file. */ | |
1062 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); | |
1063 | return TRUE; | |
1064 | } | |
1065 | ||
1066 | static bfd_boolean | |
1067 | elf32_x86_64_elf_object_p (bfd *abfd) | |
1068 | { | |
1069 | /* Set the right machine number for an x86-64 elf32 file. */ | |
1070 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); | |
1071 | return TRUE; | |
1072 | } | |
1073 | ||
1074 | /* Return TRUE if the TLS access code sequence support transition | |
1075 | from R_TYPE. */ | |
1076 | ||
1077 | static bfd_boolean | |
1078 | elf_x86_64_check_tls_transition (bfd *abfd, | |
1079 | struct bfd_link_info *info, | |
1080 | asection *sec, | |
1081 | bfd_byte *contents, | |
1082 | Elf_Internal_Shdr *symtab_hdr, | |
1083 | struct elf_link_hash_entry **sym_hashes, | |
1084 | unsigned int r_type, | |
1085 | const Elf_Internal_Rela *rel, | |
1086 | const Elf_Internal_Rela *relend) | |
1087 | { | |
1088 | unsigned int val; | |
1089 | unsigned long r_symndx; | |
1090 | struct elf_link_hash_entry *h; | |
1091 | bfd_vma offset; | |
1092 | struct elf_x86_64_link_hash_table *htab; | |
1093 | ||
1094 | /* Get the section contents. */ | |
1095 | if (contents == NULL) | |
1096 | { | |
1097 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1098 | contents = elf_section_data (sec)->this_hdr.contents; | |
1099 | else | |
1100 | { | |
1101 | /* FIXME: How to better handle error condition? */ | |
1102 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) | |
1103 | return FALSE; | |
1104 | ||
1105 | /* Cache the section contents for elf_link_input_bfd. */ | |
1106 | elf_section_data (sec)->this_hdr.contents = contents; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | htab = elf_x86_64_hash_table (info); | |
1111 | offset = rel->r_offset; | |
1112 | switch (r_type) | |
1113 | { | |
1114 | case R_X86_64_TLSGD: | |
1115 | case R_X86_64_TLSLD: | |
1116 | if ((rel + 1) >= relend) | |
1117 | return FALSE; | |
1118 | ||
1119 | if (r_type == R_X86_64_TLSGD) | |
1120 | { | |
1121 | /* Check transition from GD access model. For 64bit, only | |
1122 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
1123 | .word 0x6666; rex64; call __tls_get_addr | |
1124 | can transit to different access model. For 32bit, only | |
1125 | leaq foo@tlsgd(%rip), %rdi | |
1126 | .word 0x6666; rex64; call __tls_get_addr | |
1127 | can transit to different access model. */ | |
1128 | ||
1129 | static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 }; | |
1130 | static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d }; | |
1131 | ||
1132 | if ((offset + 12) > sec->size | |
1133 | || memcmp (contents + offset + 4, call, 4) != 0) | |
1134 | return FALSE; | |
1135 | ||
1136 | if (ABI_64_P (abfd)) | |
1137 | { | |
1138 | if (offset < 4 | |
1139 | || memcmp (contents + offset - 4, leaq, 4) != 0) | |
1140 | return FALSE; | |
1141 | } | |
1142 | else | |
1143 | { | |
1144 | if (offset < 3 | |
1145 | || memcmp (contents + offset - 3, leaq + 1, 3) != 0) | |
1146 | return FALSE; | |
1147 | } | |
1148 | } | |
1149 | else | |
1150 | { | |
1151 | /* Check transition from LD access model. Only | |
1152 | leaq foo@tlsld(%rip), %rdi; | |
1153 | call __tls_get_addr | |
1154 | can transit to different access model. */ | |
1155 | ||
1156 | static const unsigned char lea[] = { 0x48, 0x8d, 0x3d }; | |
1157 | ||
1158 | if (offset < 3 || (offset + 9) > sec->size) | |
1159 | return FALSE; | |
1160 | ||
1161 | if (memcmp (contents + offset - 3, lea, 3) != 0 | |
1162 | || 0xe8 != *(contents + offset + 4)) | |
1163 | return FALSE; | |
1164 | } | |
1165 | ||
1166 | r_symndx = htab->r_sym (rel[1].r_info); | |
1167 | if (r_symndx < symtab_hdr->sh_info) | |
1168 | return FALSE; | |
1169 | ||
1170 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1171 | /* Use strncmp to check __tls_get_addr since __tls_get_addr | |
1172 | may be versioned. */ | |
1173 | return (h != NULL | |
1174 | && h->root.root.string != NULL | |
1175 | && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32 | |
1176 | || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32) | |
1177 | && (strncmp (h->root.root.string, | |
1178 | "__tls_get_addr", 14) == 0)); | |
1179 | ||
1180 | case R_X86_64_GOTTPOFF: | |
1181 | /* Check transition from IE access model: | |
1182 | mov foo@gottpoff(%rip), %reg | |
1183 | add foo@gottpoff(%rip), %reg | |
1184 | */ | |
1185 | ||
1186 | /* Check REX prefix first. */ | |
1187 | if (offset >= 3 && (offset + 4) <= sec->size) | |
1188 | { | |
1189 | val = bfd_get_8 (abfd, contents + offset - 3); | |
1190 | if (val != 0x48 && val != 0x4c) | |
1191 | { | |
1192 | /* X32 may have 0x44 REX prefix or no REX prefix. */ | |
1193 | if (ABI_64_P (abfd)) | |
1194 | return FALSE; | |
1195 | } | |
1196 | } | |
1197 | else | |
1198 | { | |
1199 | /* X32 may not have any REX prefix. */ | |
1200 | if (ABI_64_P (abfd)) | |
1201 | return FALSE; | |
1202 | if (offset < 2 || (offset + 3) > sec->size) | |
1203 | return FALSE; | |
1204 | } | |
1205 | ||
1206 | val = bfd_get_8 (abfd, contents + offset - 2); | |
1207 | if (val != 0x8b && val != 0x03) | |
1208 | return FALSE; | |
1209 | ||
1210 | val = bfd_get_8 (abfd, contents + offset - 1); | |
1211 | return (val & 0xc7) == 5; | |
1212 | ||
1213 | case R_X86_64_GOTPC32_TLSDESC: | |
1214 | /* Check transition from GDesc access model: | |
1215 | leaq x@tlsdesc(%rip), %rax | |
1216 | ||
1217 | Make sure it's a leaq adding rip to a 32-bit offset | |
1218 | into any register, although it's probably almost always | |
1219 | going to be rax. */ | |
1220 | ||
1221 | if (offset < 3 || (offset + 4) > sec->size) | |
1222 | return FALSE; | |
1223 | ||
1224 | val = bfd_get_8 (abfd, contents + offset - 3); | |
1225 | if ((val & 0xfb) != 0x48) | |
1226 | return FALSE; | |
1227 | ||
1228 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) | |
1229 | return FALSE; | |
1230 | ||
1231 | val = bfd_get_8 (abfd, contents + offset - 1); | |
1232 | return (val & 0xc7) == 0x05; | |
1233 | ||
1234 | case R_X86_64_TLSDESC_CALL: | |
1235 | /* Check transition from GDesc access model: | |
1236 | call *x@tlsdesc(%rax) | |
1237 | */ | |
1238 | if (offset + 2 <= sec->size) | |
1239 | { | |
1240 | /* Make sure that it's a call *x@tlsdesc(%rax). */ | |
1241 | static const unsigned char call[] = { 0xff, 0x10 }; | |
1242 | return memcmp (contents + offset, call, 2) == 0; | |
1243 | } | |
1244 | ||
1245 | return FALSE; | |
1246 | ||
1247 | default: | |
1248 | abort (); | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | /* Return TRUE if the TLS access transition is OK or no transition | |
1253 | will be performed. Update R_TYPE if there is a transition. */ | |
1254 | ||
1255 | static bfd_boolean | |
1256 | elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, | |
1257 | asection *sec, bfd_byte *contents, | |
1258 | Elf_Internal_Shdr *symtab_hdr, | |
1259 | struct elf_link_hash_entry **sym_hashes, | |
1260 | unsigned int *r_type, int tls_type, | |
1261 | const Elf_Internal_Rela *rel, | |
1262 | const Elf_Internal_Rela *relend, | |
1263 | struct elf_link_hash_entry *h, | |
1264 | unsigned long r_symndx) | |
1265 | { | |
1266 | unsigned int from_type = *r_type; | |
1267 | unsigned int to_type = from_type; | |
1268 | bfd_boolean check = TRUE; | |
1269 | ||
1270 | /* Skip TLS transition for functions. */ | |
1271 | if (h != NULL | |
1272 | && (h->type == STT_FUNC | |
1273 | || h->type == STT_GNU_IFUNC)) | |
1274 | return TRUE; | |
1275 | ||
1276 | switch (from_type) | |
1277 | { | |
1278 | case R_X86_64_TLSGD: | |
1279 | case R_X86_64_GOTPC32_TLSDESC: | |
1280 | case R_X86_64_TLSDESC_CALL: | |
1281 | case R_X86_64_GOTTPOFF: | |
1282 | if (info->executable) | |
1283 | { | |
1284 | if (h == NULL) | |
1285 | to_type = R_X86_64_TPOFF32; | |
1286 | else | |
1287 | to_type = R_X86_64_GOTTPOFF; | |
1288 | } | |
1289 | ||
1290 | /* When we are called from elf_x86_64_relocate_section, | |
1291 | CONTENTS isn't NULL and there may be additional transitions | |
1292 | based on TLS_TYPE. */ | |
1293 | if (contents != NULL) | |
1294 | { | |
1295 | unsigned int new_to_type = to_type; | |
1296 | ||
1297 | if (info->executable | |
1298 | && h != NULL | |
1299 | && h->dynindx == -1 | |
1300 | && tls_type == GOT_TLS_IE) | |
1301 | new_to_type = R_X86_64_TPOFF32; | |
1302 | ||
1303 | if (to_type == R_X86_64_TLSGD | |
1304 | || to_type == R_X86_64_GOTPC32_TLSDESC | |
1305 | || to_type == R_X86_64_TLSDESC_CALL) | |
1306 | { | |
1307 | if (tls_type == GOT_TLS_IE) | |
1308 | new_to_type = R_X86_64_GOTTPOFF; | |
1309 | } | |
1310 | ||
1311 | /* We checked the transition before when we were called from | |
1312 | elf_x86_64_check_relocs. We only want to check the new | |
1313 | transition which hasn't been checked before. */ | |
1314 | check = new_to_type != to_type && from_type == to_type; | |
1315 | to_type = new_to_type; | |
1316 | } | |
1317 | ||
1318 | break; | |
1319 | ||
1320 | case R_X86_64_TLSLD: | |
1321 | if (info->executable) | |
1322 | to_type = R_X86_64_TPOFF32; | |
1323 | break; | |
1324 | ||
1325 | default: | |
1326 | return TRUE; | |
1327 | } | |
1328 | ||
1329 | /* Return TRUE if there is no transition. */ | |
1330 | if (from_type == to_type) | |
1331 | return TRUE; | |
1332 | ||
1333 | /* Check if the transition can be performed. */ | |
1334 | if (check | |
1335 | && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, | |
1336 | symtab_hdr, sym_hashes, | |
1337 | from_type, rel, relend)) | |
1338 | { | |
1339 | reloc_howto_type *from, *to; | |
1340 | const char *name; | |
1341 | ||
1342 | from = elf_x86_64_rtype_to_howto (abfd, from_type); | |
1343 | to = elf_x86_64_rtype_to_howto (abfd, to_type); | |
1344 | ||
1345 | if (h) | |
1346 | name = h->root.root.string; | |
1347 | else | |
1348 | { | |
1349 | struct elf_x86_64_link_hash_table *htab; | |
1350 | ||
1351 | htab = elf_x86_64_hash_table (info); | |
1352 | if (htab == NULL) | |
1353 | name = "*unknown*"; | |
1354 | else | |
1355 | { | |
1356 | Elf_Internal_Sym *isym; | |
1357 | ||
1358 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1359 | abfd, r_symndx); | |
1360 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | (*_bfd_error_handler) | |
1365 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " | |
1366 | "in section `%A' failed"), | |
1367 | abfd, sec, from->name, to->name, name, | |
1368 | (unsigned long) rel->r_offset); | |
1369 | bfd_set_error (bfd_error_bad_value); | |
1370 | return FALSE; | |
1371 | } | |
1372 | ||
1373 | *r_type = to_type; | |
1374 | return TRUE; | |
1375 | } | |
1376 | ||
1377 | /* Look through the relocs for a section during the first phase, and | |
1378 | calculate needed space in the global offset table, procedure | |
1379 | linkage table, and dynamic reloc sections. */ | |
1380 | ||
1381 | static bfd_boolean | |
1382 | elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, | |
1383 | asection *sec, | |
1384 | const Elf_Internal_Rela *relocs) | |
1385 | { | |
1386 | struct elf_x86_64_link_hash_table *htab; | |
1387 | Elf_Internal_Shdr *symtab_hdr; | |
1388 | struct elf_link_hash_entry **sym_hashes; | |
1389 | const Elf_Internal_Rela *rel; | |
1390 | const Elf_Internal_Rela *rel_end; | |
1391 | asection *sreloc; | |
1392 | ||
1393 | if (info->relocatable) | |
1394 | return TRUE; | |
1395 | ||
1396 | BFD_ASSERT (is_x86_64_elf (abfd)); | |
1397 | ||
1398 | htab = elf_x86_64_hash_table (info); | |
1399 | if (htab == NULL) | |
1400 | return FALSE; | |
1401 | ||
1402 | symtab_hdr = &elf_symtab_hdr (abfd); | |
1403 | sym_hashes = elf_sym_hashes (abfd); | |
1404 | ||
1405 | sreloc = NULL; | |
1406 | ||
1407 | rel_end = relocs + sec->reloc_count; | |
1408 | for (rel = relocs; rel < rel_end; rel++) | |
1409 | { | |
1410 | unsigned int r_type; | |
1411 | unsigned long r_symndx; | |
1412 | struct elf_link_hash_entry *h; | |
1413 | Elf_Internal_Sym *isym; | |
1414 | const char *name; | |
1415 | bfd_boolean size_reloc; | |
1416 | ||
1417 | r_symndx = htab->r_sym (rel->r_info); | |
1418 | r_type = ELF32_R_TYPE (rel->r_info); | |
1419 | ||
1420 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
1421 | { | |
1422 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), | |
1423 | abfd, r_symndx); | |
1424 | return FALSE; | |
1425 | } | |
1426 | ||
1427 | if (r_symndx < symtab_hdr->sh_info) | |
1428 | { | |
1429 | /* A local symbol. */ | |
1430 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1431 | abfd, r_symndx); | |
1432 | if (isym == NULL) | |
1433 | return FALSE; | |
1434 | ||
1435 | /* Check relocation against local STT_GNU_IFUNC symbol. */ | |
1436 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
1437 | { | |
1438 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, | |
1439 | TRUE); | |
1440 | if (h == NULL) | |
1441 | return FALSE; | |
1442 | ||
1443 | /* Fake a STT_GNU_IFUNC symbol. */ | |
1444 | h->type = STT_GNU_IFUNC; | |
1445 | h->def_regular = 1; | |
1446 | h->ref_regular = 1; | |
1447 | h->forced_local = 1; | |
1448 | h->root.type = bfd_link_hash_defined; | |
1449 | } | |
1450 | else | |
1451 | h = NULL; | |
1452 | } | |
1453 | else | |
1454 | { | |
1455 | isym = NULL; | |
1456 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1457 | while (h->root.type == bfd_link_hash_indirect | |
1458 | || h->root.type == bfd_link_hash_warning) | |
1459 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1460 | } | |
1461 | ||
1462 | /* Check invalid x32 relocations. */ | |
1463 | if (!ABI_64_P (abfd)) | |
1464 | switch (r_type) | |
1465 | { | |
1466 | default: | |
1467 | break; | |
1468 | ||
1469 | case R_X86_64_DTPOFF64: | |
1470 | case R_X86_64_TPOFF64: | |
1471 | case R_X86_64_PC64: | |
1472 | case R_X86_64_GOTOFF64: | |
1473 | case R_X86_64_GOT64: | |
1474 | case R_X86_64_GOTPCREL64: | |
1475 | case R_X86_64_GOTPC64: | |
1476 | case R_X86_64_GOTPLT64: | |
1477 | case R_X86_64_PLTOFF64: | |
1478 | { | |
1479 | if (h) | |
1480 | name = h->root.root.string; | |
1481 | else | |
1482 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, | |
1483 | NULL); | |
1484 | (*_bfd_error_handler) | |
1485 | (_("%B: relocation %s against symbol `%s' isn't " | |
1486 | "supported in x32 mode"), abfd, | |
1487 | x86_64_elf_howto_table[r_type].name, name); | |
1488 | bfd_set_error (bfd_error_bad_value); | |
1489 | return FALSE; | |
1490 | } | |
1491 | break; | |
1492 | } | |
1493 | ||
1494 | if (h != NULL) | |
1495 | { | |
1496 | /* Create the ifunc sections for static executables. If we | |
1497 | never see an indirect function symbol nor we are building | |
1498 | a static executable, those sections will be empty and | |
1499 | won't appear in output. */ | |
1500 | switch (r_type) | |
1501 | { | |
1502 | default: | |
1503 | break; | |
1504 | ||
1505 | case R_X86_64_32S: | |
1506 | case R_X86_64_32: | |
1507 | case R_X86_64_64: | |
1508 | case R_X86_64_PC32: | |
1509 | case R_X86_64_PC64: | |
1510 | case R_X86_64_PLT32: | |
1511 | case R_X86_64_GOTPCREL: | |
1512 | case R_X86_64_GOTPCREL64: | |
1513 | if (htab->elf.dynobj == NULL) | |
1514 | htab->elf.dynobj = abfd; | |
1515 | if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) | |
1516 | return FALSE; | |
1517 | break; | |
1518 | } | |
1519 | ||
1520 | /* It is referenced by a non-shared object. */ | |
1521 | h->ref_regular = 1; | |
1522 | } | |
1523 | ||
1524 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, | |
1525 | symtab_hdr, sym_hashes, | |
1526 | &r_type, GOT_UNKNOWN, | |
1527 | rel, rel_end, h, r_symndx)) | |
1528 | return FALSE; | |
1529 | ||
1530 | switch (r_type) | |
1531 | { | |
1532 | case R_X86_64_TLSLD: | |
1533 | htab->tls_ld_got.refcount += 1; | |
1534 | goto create_got; | |
1535 | ||
1536 | case R_X86_64_TPOFF32: | |
1537 | if (!info->executable && ABI_64_P (abfd)) | |
1538 | { | |
1539 | if (h) | |
1540 | name = h->root.root.string; | |
1541 | else | |
1542 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, | |
1543 | NULL); | |
1544 | (*_bfd_error_handler) | |
1545 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), | |
1546 | abfd, | |
1547 | x86_64_elf_howto_table[r_type].name, name); | |
1548 | bfd_set_error (bfd_error_bad_value); | |
1549 | return FALSE; | |
1550 | } | |
1551 | break; | |
1552 | ||
1553 | case R_X86_64_GOTTPOFF: | |
1554 | if (!info->executable) | |
1555 | info->flags |= DF_STATIC_TLS; | |
1556 | /* Fall through */ | |
1557 | ||
1558 | case R_X86_64_GOT32: | |
1559 | case R_X86_64_GOTPCREL: | |
1560 | case R_X86_64_TLSGD: | |
1561 | case R_X86_64_GOT64: | |
1562 | case R_X86_64_GOTPCREL64: | |
1563 | case R_X86_64_GOTPLT64: | |
1564 | case R_X86_64_GOTPC32_TLSDESC: | |
1565 | case R_X86_64_TLSDESC_CALL: | |
1566 | /* This symbol requires a global offset table entry. */ | |
1567 | { | |
1568 | int tls_type, old_tls_type; | |
1569 | ||
1570 | switch (r_type) | |
1571 | { | |
1572 | default: tls_type = GOT_NORMAL; break; | |
1573 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; | |
1574 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; | |
1575 | case R_X86_64_GOTPC32_TLSDESC: | |
1576 | case R_X86_64_TLSDESC_CALL: | |
1577 | tls_type = GOT_TLS_GDESC; break; | |
1578 | } | |
1579 | ||
1580 | if (h != NULL) | |
1581 | { | |
1582 | if (r_type == R_X86_64_GOTPLT64) | |
1583 | { | |
1584 | /* This relocation indicates that we also need | |
1585 | a PLT entry, as this is a function. We don't need | |
1586 | a PLT entry for local symbols. */ | |
1587 | h->needs_plt = 1; | |
1588 | h->plt.refcount += 1; | |
1589 | } | |
1590 | h->got.refcount += 1; | |
1591 | old_tls_type = elf_x86_64_hash_entry (h)->tls_type; | |
1592 | } | |
1593 | else | |
1594 | { | |
1595 | bfd_signed_vma *local_got_refcounts; | |
1596 | ||
1597 | /* This is a global offset table entry for a local symbol. */ | |
1598 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
1599 | if (local_got_refcounts == NULL) | |
1600 | { | |
1601 | bfd_size_type size; | |
1602 | ||
1603 | size = symtab_hdr->sh_info; | |
1604 | size *= sizeof (bfd_signed_vma) | |
1605 | + sizeof (bfd_vma) + sizeof (char); | |
1606 | local_got_refcounts = ((bfd_signed_vma *) | |
1607 | bfd_zalloc (abfd, size)); | |
1608 | if (local_got_refcounts == NULL) | |
1609 | return FALSE; | |
1610 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
1611 | elf_x86_64_local_tlsdesc_gotent (abfd) | |
1612 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); | |
1613 | elf_x86_64_local_got_tls_type (abfd) | |
1614 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); | |
1615 | } | |
1616 | local_got_refcounts[r_symndx] += 1; | |
1617 | old_tls_type | |
1618 | = elf_x86_64_local_got_tls_type (abfd) [r_symndx]; | |
1619 | } | |
1620 | ||
1621 | /* If a TLS symbol is accessed using IE at least once, | |
1622 | there is no point to use dynamic model for it. */ | |
1623 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN | |
1624 | && (! GOT_TLS_GD_ANY_P (old_tls_type) | |
1625 | || tls_type != GOT_TLS_IE)) | |
1626 | { | |
1627 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) | |
1628 | tls_type = old_tls_type; | |
1629 | else if (GOT_TLS_GD_ANY_P (old_tls_type) | |
1630 | && GOT_TLS_GD_ANY_P (tls_type)) | |
1631 | tls_type |= old_tls_type; | |
1632 | else | |
1633 | { | |
1634 | if (h) | |
1635 | name = h->root.root.string; | |
1636 | else | |
1637 | name = bfd_elf_sym_name (abfd, symtab_hdr, | |
1638 | isym, NULL); | |
1639 | (*_bfd_error_handler) | |
1640 | (_("%B: '%s' accessed both as normal and thread local symbol"), | |
1641 | abfd, name); | |
1642 | bfd_set_error (bfd_error_bad_value); | |
1643 | return FALSE; | |
1644 | } | |
1645 | } | |
1646 | ||
1647 | if (old_tls_type != tls_type) | |
1648 | { | |
1649 | if (h != NULL) | |
1650 | elf_x86_64_hash_entry (h)->tls_type = tls_type; | |
1651 | else | |
1652 | elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; | |
1653 | } | |
1654 | } | |
1655 | /* Fall through */ | |
1656 | ||
1657 | case R_X86_64_GOTOFF64: | |
1658 | case R_X86_64_GOTPC32: | |
1659 | case R_X86_64_GOTPC64: | |
1660 | create_got: | |
1661 | if (htab->elf.sgot == NULL) | |
1662 | { | |
1663 | if (htab->elf.dynobj == NULL) | |
1664 | htab->elf.dynobj = abfd; | |
1665 | if (!_bfd_elf_create_got_section (htab->elf.dynobj, | |
1666 | info)) | |
1667 | return FALSE; | |
1668 | } | |
1669 | break; | |
1670 | ||
1671 | case R_X86_64_PLT32: | |
1672 | /* This symbol requires a procedure linkage table entry. We | |
1673 | actually build the entry in adjust_dynamic_symbol, | |
1674 | because this might be a case of linking PIC code which is | |
1675 | never referenced by a dynamic object, in which case we | |
1676 | don't need to generate a procedure linkage table entry | |
1677 | after all. */ | |
1678 | ||
1679 | /* If this is a local symbol, we resolve it directly without | |
1680 | creating a procedure linkage table entry. */ | |
1681 | if (h == NULL) | |
1682 | continue; | |
1683 | ||
1684 | h->needs_plt = 1; | |
1685 | h->plt.refcount += 1; | |
1686 | break; | |
1687 | ||
1688 | case R_X86_64_PLTOFF64: | |
1689 | /* This tries to form the 'address' of a function relative | |
1690 | to GOT. For global symbols we need a PLT entry. */ | |
1691 | if (h != NULL) | |
1692 | { | |
1693 | h->needs_plt = 1; | |
1694 | h->plt.refcount += 1; | |
1695 | } | |
1696 | goto create_got; | |
1697 | ||
1698 | case R_X86_64_SIZE32: | |
1699 | case R_X86_64_SIZE64: | |
1700 | size_reloc = TRUE; | |
1701 | goto do_size; | |
1702 | ||
1703 | case R_X86_64_32: | |
1704 | if (!ABI_64_P (abfd)) | |
1705 | goto pointer; | |
1706 | case R_X86_64_8: | |
1707 | case R_X86_64_16: | |
1708 | case R_X86_64_32S: | |
1709 | /* Let's help debug shared library creation. These relocs | |
1710 | cannot be used in shared libs. Don't error out for | |
1711 | sections we don't care about, such as debug sections or | |
1712 | non-constant sections. */ | |
1713 | if (info->shared | |
1714 | && (sec->flags & SEC_ALLOC) != 0 | |
1715 | && (sec->flags & SEC_READONLY) != 0) | |
1716 | { | |
1717 | if (h) | |
1718 | name = h->root.root.string; | |
1719 | else | |
1720 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); | |
1721 | (*_bfd_error_handler) | |
1722 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), | |
1723 | abfd, x86_64_elf_howto_table[r_type].name, name); | |
1724 | bfd_set_error (bfd_error_bad_value); | |
1725 | return FALSE; | |
1726 | } | |
1727 | /* Fall through. */ | |
1728 | ||
1729 | case R_X86_64_PC8: | |
1730 | case R_X86_64_PC16: | |
1731 | case R_X86_64_PC32: | |
1732 | case R_X86_64_PC64: | |
1733 | case R_X86_64_64: | |
1734 | pointer: | |
1735 | if (h != NULL && info->executable) | |
1736 | { | |
1737 | /* If this reloc is in a read-only section, we might | |
1738 | need a copy reloc. We can't check reliably at this | |
1739 | stage whether the section is read-only, as input | |
1740 | sections have not yet been mapped to output sections. | |
1741 | Tentatively set the flag for now, and correct in | |
1742 | adjust_dynamic_symbol. */ | |
1743 | h->non_got_ref = 1; | |
1744 | ||
1745 | /* We may need a .plt entry if the function this reloc | |
1746 | refers to is in a shared lib. */ | |
1747 | h->plt.refcount += 1; | |
1748 | if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) | |
1749 | h->pointer_equality_needed = 1; | |
1750 | } | |
1751 | ||
1752 | size_reloc = FALSE; | |
1753 | do_size: | |
1754 | /* If we are creating a shared library, and this is a reloc | |
1755 | against a global symbol, or a non PC relative reloc | |
1756 | against a local symbol, then we need to copy the reloc | |
1757 | into the shared library. However, if we are linking with | |
1758 | -Bsymbolic, we do not need to copy a reloc against a | |
1759 | global symbol which is defined in an object we are | |
1760 | including in the link (i.e., DEF_REGULAR is set). At | |
1761 | this point we have not seen all the input files, so it is | |
1762 | possible that DEF_REGULAR is not set now but will be set | |
1763 | later (it is never cleared). In case of a weak definition, | |
1764 | DEF_REGULAR may be cleared later by a strong definition in | |
1765 | a shared library. We account for that possibility below by | |
1766 | storing information in the relocs_copied field of the hash | |
1767 | table entry. A similar situation occurs when creating | |
1768 | shared libraries and symbol visibility changes render the | |
1769 | symbol local. | |
1770 | ||
1771 | If on the other hand, we are creating an executable, we | |
1772 | may need to keep relocations for symbols satisfied by a | |
1773 | dynamic library if we manage to avoid copy relocs for the | |
1774 | symbol. */ | |
1775 | if ((info->shared | |
1776 | && (sec->flags & SEC_ALLOC) != 0 | |
1777 | && (! IS_X86_64_PCREL_TYPE (r_type) | |
1778 | || (h != NULL | |
1779 | && (! SYMBOLIC_BIND (info, h) | |
1780 | || h->root.type == bfd_link_hash_defweak | |
1781 | || !h->def_regular)))) | |
1782 | || (ELIMINATE_COPY_RELOCS | |
1783 | && !info->shared | |
1784 | && (sec->flags & SEC_ALLOC) != 0 | |
1785 | && h != NULL | |
1786 | && (h->root.type == bfd_link_hash_defweak | |
1787 | || !h->def_regular))) | |
1788 | { | |
1789 | struct elf_dyn_relocs *p; | |
1790 | struct elf_dyn_relocs **head; | |
1791 | ||
1792 | /* We must copy these reloc types into the output file. | |
1793 | Create a reloc section in dynobj and make room for | |
1794 | this reloc. */ | |
1795 | if (sreloc == NULL) | |
1796 | { | |
1797 | if (htab->elf.dynobj == NULL) | |
1798 | htab->elf.dynobj = abfd; | |
1799 | ||
1800 | sreloc = _bfd_elf_make_dynamic_reloc_section | |
1801 | (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2, | |
1802 | abfd, /*rela?*/ TRUE); | |
1803 | ||
1804 | if (sreloc == NULL) | |
1805 | return FALSE; | |
1806 | } | |
1807 | ||
1808 | /* If this is a global symbol, we count the number of | |
1809 | relocations we need for this symbol. */ | |
1810 | if (h != NULL) | |
1811 | { | |
1812 | head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs; | |
1813 | } | |
1814 | else | |
1815 | { | |
1816 | /* Track dynamic relocs needed for local syms too. | |
1817 | We really need local syms available to do this | |
1818 | easily. Oh well. */ | |
1819 | asection *s; | |
1820 | void **vpp; | |
1821 | ||
1822 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1823 | abfd, r_symndx); | |
1824 | if (isym == NULL) | |
1825 | return FALSE; | |
1826 | ||
1827 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1828 | if (s == NULL) | |
1829 | s = sec; | |
1830 | ||
1831 | /* Beware of type punned pointers vs strict aliasing | |
1832 | rules. */ | |
1833 | vpp = &(elf_section_data (s)->local_dynrel); | |
1834 | head = (struct elf_dyn_relocs **)vpp; | |
1835 | } | |
1836 | ||
1837 | p = *head; | |
1838 | if (p == NULL || p->sec != sec) | |
1839 | { | |
1840 | bfd_size_type amt = sizeof *p; | |
1841 | ||
1842 | p = ((struct elf_dyn_relocs *) | |
1843 | bfd_alloc (htab->elf.dynobj, amt)); | |
1844 | if (p == NULL) | |
1845 | return FALSE; | |
1846 | p->next = *head; | |
1847 | *head = p; | |
1848 | p->sec = sec; | |
1849 | p->count = 0; | |
1850 | p->pc_count = 0; | |
1851 | } | |
1852 | ||
1853 | p->count += 1; | |
1854 | /* Count size relocation as PC-relative relocation. */ | |
1855 | if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc) | |
1856 | p->pc_count += 1; | |
1857 | } | |
1858 | break; | |
1859 | ||
1860 | /* This relocation describes the C++ object vtable hierarchy. | |
1861 | Reconstruct it for later use during GC. */ | |
1862 | case R_X86_64_GNU_VTINHERIT: | |
1863 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
1864 | return FALSE; | |
1865 | break; | |
1866 | ||
1867 | /* This relocation describes which C++ vtable entries are actually | |
1868 | used. Record for later use during GC. */ | |
1869 | case R_X86_64_GNU_VTENTRY: | |
1870 | BFD_ASSERT (h != NULL); | |
1871 | if (h != NULL | |
1872 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
1873 | return FALSE; | |
1874 | break; | |
1875 | ||
1876 | default: | |
1877 | break; | |
1878 | } | |
1879 | } | |
1880 | ||
1881 | return TRUE; | |
1882 | } | |
1883 | ||
1884 | /* Return the section that should be marked against GC for a given | |
1885 | relocation. */ | |
1886 | ||
1887 | static asection * | |
1888 | elf_x86_64_gc_mark_hook (asection *sec, | |
1889 | struct bfd_link_info *info, | |
1890 | Elf_Internal_Rela *rel, | |
1891 | struct elf_link_hash_entry *h, | |
1892 | Elf_Internal_Sym *sym) | |
1893 | { | |
1894 | if (h != NULL) | |
1895 | switch (ELF32_R_TYPE (rel->r_info)) | |
1896 | { | |
1897 | case R_X86_64_GNU_VTINHERIT: | |
1898 | case R_X86_64_GNU_VTENTRY: | |
1899 | return NULL; | |
1900 | } | |
1901 | ||
1902 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
1903 | } | |
1904 | ||
1905 | /* Update the got entry reference counts for the section being removed. */ | |
1906 | ||
1907 | static bfd_boolean | |
1908 | elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, | |
1909 | asection *sec, | |
1910 | const Elf_Internal_Rela *relocs) | |
1911 | { | |
1912 | struct elf_x86_64_link_hash_table *htab; | |
1913 | Elf_Internal_Shdr *symtab_hdr; | |
1914 | struct elf_link_hash_entry **sym_hashes; | |
1915 | bfd_signed_vma *local_got_refcounts; | |
1916 | const Elf_Internal_Rela *rel, *relend; | |
1917 | ||
1918 | if (info->relocatable) | |
1919 | return TRUE; | |
1920 | ||
1921 | htab = elf_x86_64_hash_table (info); | |
1922 | if (htab == NULL) | |
1923 | return FALSE; | |
1924 | ||
1925 | elf_section_data (sec)->local_dynrel = NULL; | |
1926 | ||
1927 | symtab_hdr = &elf_symtab_hdr (abfd); | |
1928 | sym_hashes = elf_sym_hashes (abfd); | |
1929 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
1930 | ||
1931 | htab = elf_x86_64_hash_table (info); | |
1932 | relend = relocs + sec->reloc_count; | |
1933 | for (rel = relocs; rel < relend; rel++) | |
1934 | { | |
1935 | unsigned long r_symndx; | |
1936 | unsigned int r_type; | |
1937 | struct elf_link_hash_entry *h = NULL; | |
1938 | ||
1939 | r_symndx = htab->r_sym (rel->r_info); | |
1940 | if (r_symndx >= symtab_hdr->sh_info) | |
1941 | { | |
1942 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1943 | while (h->root.type == bfd_link_hash_indirect | |
1944 | || h->root.type == bfd_link_hash_warning) | |
1945 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | /* A local symbol. */ | |
1950 | Elf_Internal_Sym *isym; | |
1951 | ||
1952 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
1953 | abfd, r_symndx); | |
1954 | ||
1955 | /* Check relocation against local STT_GNU_IFUNC symbol. */ | |
1956 | if (isym != NULL | |
1957 | && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
1958 | { | |
1959 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE); | |
1960 | if (h == NULL) | |
1961 | abort (); | |
1962 | } | |
1963 | } | |
1964 | ||
1965 | if (h) | |
1966 | { | |
1967 | struct elf_x86_64_link_hash_entry *eh; | |
1968 | struct elf_dyn_relocs **pp; | |
1969 | struct elf_dyn_relocs *p; | |
1970 | ||
1971 | eh = (struct elf_x86_64_link_hash_entry *) h; | |
1972 | ||
1973 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) | |
1974 | if (p->sec == sec) | |
1975 | { | |
1976 | /* Everything must go for SEC. */ | |
1977 | *pp = p->next; | |
1978 | break; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | r_type = ELF32_R_TYPE (rel->r_info); | |
1983 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, | |
1984 | symtab_hdr, sym_hashes, | |
1985 | &r_type, GOT_UNKNOWN, | |
1986 | rel, relend, h, r_symndx)) | |
1987 | return FALSE; | |
1988 | ||
1989 | switch (r_type) | |
1990 | { | |
1991 | case R_X86_64_TLSLD: | |
1992 | if (htab->tls_ld_got.refcount > 0) | |
1993 | htab->tls_ld_got.refcount -= 1; | |
1994 | break; | |
1995 | ||
1996 | case R_X86_64_TLSGD: | |
1997 | case R_X86_64_GOTPC32_TLSDESC: | |
1998 | case R_X86_64_TLSDESC_CALL: | |
1999 | case R_X86_64_GOTTPOFF: | |
2000 | case R_X86_64_GOT32: | |
2001 | case R_X86_64_GOTPCREL: | |
2002 | case R_X86_64_GOT64: | |
2003 | case R_X86_64_GOTPCREL64: | |
2004 | case R_X86_64_GOTPLT64: | |
2005 | if (h != NULL) | |
2006 | { | |
2007 | if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) | |
2008 | h->plt.refcount -= 1; | |
2009 | if (h->got.refcount > 0) | |
2010 | h->got.refcount -= 1; | |
2011 | if (h->type == STT_GNU_IFUNC) | |
2012 | { | |
2013 | if (h->plt.refcount > 0) | |
2014 | h->plt.refcount -= 1; | |
2015 | } | |
2016 | } | |
2017 | else if (local_got_refcounts != NULL) | |
2018 | { | |
2019 | if (local_got_refcounts[r_symndx] > 0) | |
2020 | local_got_refcounts[r_symndx] -= 1; | |
2021 | } | |
2022 | break; | |
2023 | ||
2024 | case R_X86_64_8: | |
2025 | case R_X86_64_16: | |
2026 | case R_X86_64_32: | |
2027 | case R_X86_64_64: | |
2028 | case R_X86_64_32S: | |
2029 | case R_X86_64_PC8: | |
2030 | case R_X86_64_PC16: | |
2031 | case R_X86_64_PC32: | |
2032 | case R_X86_64_PC64: | |
2033 | case R_X86_64_SIZE32: | |
2034 | case R_X86_64_SIZE64: | |
2035 | if (info->shared | |
2036 | && (h == NULL || h->type != STT_GNU_IFUNC)) | |
2037 | break; | |
2038 | /* Fall thru */ | |
2039 | ||
2040 | case R_X86_64_PLT32: | |
2041 | case R_X86_64_PLTOFF64: | |
2042 | if (h != NULL) | |
2043 | { | |
2044 | if (h->plt.refcount > 0) | |
2045 | h->plt.refcount -= 1; | |
2046 | } | |
2047 | break; | |
2048 | ||
2049 | default: | |
2050 | break; | |
2051 | } | |
2052 | } | |
2053 | ||
2054 | return TRUE; | |
2055 | } | |
2056 | ||
2057 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2058 | regular object. The current definition is in some section of the | |
2059 | dynamic object, but we're not including those sections. We have to | |
2060 | change the definition to something the rest of the link can | |
2061 | understand. */ | |
2062 | ||
2063 | static bfd_boolean | |
2064 | elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, | |
2065 | struct elf_link_hash_entry *h) | |
2066 | { | |
2067 | struct elf_x86_64_link_hash_table *htab; | |
2068 | asection *s; | |
2069 | struct elf_x86_64_link_hash_entry *eh; | |
2070 | struct elf_dyn_relocs *p; | |
2071 | ||
2072 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
2073 | if (h->type == STT_GNU_IFUNC) | |
2074 | { | |
2075 | /* All local STT_GNU_IFUNC references must be treate as local | |
2076 | calls via local PLT. */ | |
2077 | if (h->ref_regular | |
2078 | && SYMBOL_CALLS_LOCAL (info, h)) | |
2079 | { | |
2080 | bfd_size_type pc_count = 0, count = 0; | |
2081 | struct elf_dyn_relocs **pp; | |
2082 | ||
2083 | eh = (struct elf_x86_64_link_hash_entry *) h; | |
2084 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
2085 | { | |
2086 | pc_count += p->pc_count; | |
2087 | p->count -= p->pc_count; | |
2088 | p->pc_count = 0; | |
2089 | count += p->count; | |
2090 | if (p->count == 0) | |
2091 | *pp = p->next; | |
2092 | else | |
2093 | pp = &p->next; | |
2094 | } | |
2095 | ||
2096 | if (pc_count || count) | |
2097 | { | |
2098 | h->needs_plt = 1; | |
2099 | h->non_got_ref = 1; | |
2100 | if (h->plt.refcount <= 0) | |
2101 | h->plt.refcount = 1; | |
2102 | else | |
2103 | h->plt.refcount += 1; | |
2104 | } | |
2105 | } | |
2106 | ||
2107 | if (h->plt.refcount <= 0) | |
2108 | { | |
2109 | h->plt.offset = (bfd_vma) -1; | |
2110 | h->needs_plt = 0; | |
2111 | } | |
2112 | return TRUE; | |
2113 | } | |
2114 | ||
2115 | /* If this is a function, put it in the procedure linkage table. We | |
2116 | will fill in the contents of the procedure linkage table later, | |
2117 | when we know the address of the .got section. */ | |
2118 | if (h->type == STT_FUNC | |
2119 | || h->needs_plt) | |
2120 | { | |
2121 | if (h->plt.refcount <= 0 | |
2122 | || SYMBOL_CALLS_LOCAL (info, h) | |
2123 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
2124 | && h->root.type == bfd_link_hash_undefweak)) | |
2125 | { | |
2126 | /* This case can occur if we saw a PLT32 reloc in an input | |
2127 | file, but the symbol was never referred to by a dynamic | |
2128 | object, or if all references were garbage collected. In | |
2129 | such a case, we don't actually need to build a procedure | |
2130 | linkage table, and we can just do a PC32 reloc instead. */ | |
2131 | h->plt.offset = (bfd_vma) -1; | |
2132 | h->needs_plt = 0; | |
2133 | } | |
2134 | ||
2135 | return TRUE; | |
2136 | } | |
2137 | else | |
2138 | /* It's possible that we incorrectly decided a .plt reloc was | |
2139 | needed for an R_X86_64_PC32 reloc to a non-function sym in | |
2140 | check_relocs. We can't decide accurately between function and | |
2141 | non-function syms in check-relocs; Objects loaded later in | |
2142 | the link may change h->type. So fix it now. */ | |
2143 | h->plt.offset = (bfd_vma) -1; | |
2144 | ||
2145 | /* If this is a weak symbol, and there is a real definition, the | |
2146 | processor independent code will have arranged for us to see the | |
2147 | real definition first, and we can just use the same value. */ | |
2148 | if (h->u.weakdef != NULL) | |
2149 | { | |
2150 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined | |
2151 | || h->u.weakdef->root.type == bfd_link_hash_defweak); | |
2152 | h->root.u.def.section = h->u.weakdef->root.u.def.section; | |
2153 | h->root.u.def.value = h->u.weakdef->root.u.def.value; | |
2154 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) | |
2155 | h->non_got_ref = h->u.weakdef->non_got_ref; | |
2156 | return TRUE; | |
2157 | } | |
2158 | ||
2159 | /* This is a reference to a symbol defined by a dynamic object which | |
2160 | is not a function. */ | |
2161 | ||
2162 | /* If we are creating a shared library, we must presume that the | |
2163 | only references to the symbol are via the global offset table. | |
2164 | For such cases we need not do anything here; the relocations will | |
2165 | be handled correctly by relocate_section. */ | |
2166 | if (info->shared) | |
2167 | return TRUE; | |
2168 | ||
2169 | /* If there are no references to this symbol that do not use the | |
2170 | GOT, we don't need to generate a copy reloc. */ | |
2171 | if (!h->non_got_ref) | |
2172 | return TRUE; | |
2173 | ||
2174 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
2175 | if (info->nocopyreloc) | |
2176 | { | |
2177 | h->non_got_ref = 0; | |
2178 | return TRUE; | |
2179 | } | |
2180 | ||
2181 | if (ELIMINATE_COPY_RELOCS) | |
2182 | { | |
2183 | eh = (struct elf_x86_64_link_hash_entry *) h; | |
2184 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
2185 | { | |
2186 | s = p->sec->output_section; | |
2187 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
2188 | break; | |
2189 | } | |
2190 | ||
2191 | /* If we didn't find any dynamic relocs in read-only sections, then | |
2192 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ | |
2193 | if (p == NULL) | |
2194 | { | |
2195 | h->non_got_ref = 0; | |
2196 | return TRUE; | |
2197 | } | |
2198 | } | |
2199 | ||
2200 | /* We must allocate the symbol in our .dynbss section, which will | |
2201 | become part of the .bss section of the executable. There will be | |
2202 | an entry for this symbol in the .dynsym section. The dynamic | |
2203 | object will contain position independent code, so all references | |
2204 | from the dynamic object to this symbol will go through the global | |
2205 | offset table. The dynamic linker will use the .dynsym entry to | |
2206 | determine the address it must put in the global offset table, so | |
2207 | both the dynamic object and the regular object will refer to the | |
2208 | same memory location for the variable. */ | |
2209 | ||
2210 | htab = elf_x86_64_hash_table (info); | |
2211 | if (htab == NULL) | |
2212 | return FALSE; | |
2213 | ||
2214 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker | |
2215 | to copy the initial value out of the dynamic object and into the | |
2216 | runtime process image. */ | |
2217 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) | |
2218 | { | |
2219 | const struct elf_backend_data *bed; | |
2220 | bed = get_elf_backend_data (info->output_bfd); | |
2221 | htab->srelbss->size += bed->s->sizeof_rela; | |
2222 | h->needs_copy = 1; | |
2223 | } | |
2224 | ||
2225 | s = htab->sdynbss; | |
2226 | ||
2227 | return _bfd_elf_adjust_dynamic_copy (h, s); | |
2228 | } | |
2229 | ||
2230 | /* Allocate space in .plt, .got and associated reloc sections for | |
2231 | dynamic relocs. */ | |
2232 | ||
2233 | static bfd_boolean | |
2234 | elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) | |
2235 | { | |
2236 | struct bfd_link_info *info; | |
2237 | struct elf_x86_64_link_hash_table *htab; | |
2238 | struct elf_x86_64_link_hash_entry *eh; | |
2239 | struct elf_dyn_relocs *p; | |
2240 | const struct elf_backend_data *bed; | |
2241 | unsigned int plt_entry_size; | |
2242 | ||
2243 | if (h->root.type == bfd_link_hash_indirect) | |
2244 | return TRUE; | |
2245 | ||
2246 | eh = (struct elf_x86_64_link_hash_entry *) h; | |
2247 | ||
2248 | info = (struct bfd_link_info *) inf; | |
2249 | htab = elf_x86_64_hash_table (info); | |
2250 | if (htab == NULL) | |
2251 | return FALSE; | |
2252 | bed = get_elf_backend_data (info->output_bfd); | |
2253 | plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); | |
2254 | ||
2255 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
2256 | here if it is defined and referenced in a non-shared object. */ | |
2257 | if (h->type == STT_GNU_IFUNC | |
2258 | && h->def_regular) | |
2259 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, | |
2260 | &eh->dyn_relocs, | |
2261 | plt_entry_size, | |
2262 | GOT_ENTRY_SIZE); | |
2263 | else if (htab->elf.dynamic_sections_created | |
2264 | && h->plt.refcount > 0) | |
2265 | { | |
2266 | /* Make sure this symbol is output as a dynamic symbol. | |
2267 | Undefined weak syms won't yet be marked as dynamic. */ | |
2268 | if (h->dynindx == -1 | |
2269 | && !h->forced_local) | |
2270 | { | |
2271 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2272 | return FALSE; | |
2273 | } | |
2274 | ||
2275 | if (info->shared | |
2276 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) | |
2277 | { | |
2278 | asection *s = htab->elf.splt; | |
2279 | ||
2280 | /* If this is the first .plt entry, make room for the special | |
2281 | first entry. */ | |
2282 | if (s->size == 0) | |
2283 | s->size += plt_entry_size; | |
2284 | ||
2285 | h->plt.offset = s->size; | |
2286 | ||
2287 | /* If this symbol is not defined in a regular file, and we are | |
2288 | not generating a shared library, then set the symbol to this | |
2289 | location in the .plt. This is required to make function | |
2290 | pointers compare as equal between the normal executable and | |
2291 | the shared library. */ | |
2292 | if (! info->shared | |
2293 | && !h->def_regular) | |
2294 | { | |
2295 | h->root.u.def.section = s; | |
2296 | h->root.u.def.value = h->plt.offset; | |
2297 | } | |
2298 | ||
2299 | /* Make room for this entry. */ | |
2300 | s->size += plt_entry_size; | |
2301 | ||
2302 | /* We also need to make an entry in the .got.plt section, which | |
2303 | will be placed in the .got section by the linker script. */ | |
2304 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; | |
2305 | ||
2306 | /* We also need to make an entry in the .rela.plt section. */ | |
2307 | htab->elf.srelplt->size += bed->s->sizeof_rela; | |
2308 | htab->elf.srelplt->reloc_count++; | |
2309 | } | |
2310 | else | |
2311 | { | |
2312 | h->plt.offset = (bfd_vma) -1; | |
2313 | h->needs_plt = 0; | |
2314 | } | |
2315 | } | |
2316 | else | |
2317 | { | |
2318 | h->plt.offset = (bfd_vma) -1; | |
2319 | h->needs_plt = 0; | |
2320 | } | |
2321 | ||
2322 | eh->tlsdesc_got = (bfd_vma) -1; | |
2323 | ||
2324 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, | |
2325 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ | |
2326 | if (h->got.refcount > 0 | |
2327 | && info->executable | |
2328 | && h->dynindx == -1 | |
2329 | && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) | |
2330 | { | |
2331 | h->got.offset = (bfd_vma) -1; | |
2332 | } | |
2333 | else if (h->got.refcount > 0) | |
2334 | { | |
2335 | asection *s; | |
2336 | bfd_boolean dyn; | |
2337 | int tls_type = elf_x86_64_hash_entry (h)->tls_type; | |
2338 | ||
2339 | /* Make sure this symbol is output as a dynamic symbol. | |
2340 | Undefined weak syms won't yet be marked as dynamic. */ | |
2341 | if (h->dynindx == -1 | |
2342 | && !h->forced_local) | |
2343 | { | |
2344 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2345 | return FALSE; | |
2346 | } | |
2347 | ||
2348 | if (GOT_TLS_GDESC_P (tls_type)) | |
2349 | { | |
2350 | eh->tlsdesc_got = htab->elf.sgotplt->size | |
2351 | - elf_x86_64_compute_jump_table_size (htab); | |
2352 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; | |
2353 | h->got.offset = (bfd_vma) -2; | |
2354 | } | |
2355 | if (! GOT_TLS_GDESC_P (tls_type) | |
2356 | || GOT_TLS_GD_P (tls_type)) | |
2357 | { | |
2358 | s = htab->elf.sgot; | |
2359 | h->got.offset = s->size; | |
2360 | s->size += GOT_ENTRY_SIZE; | |
2361 | if (GOT_TLS_GD_P (tls_type)) | |
2362 | s->size += GOT_ENTRY_SIZE; | |
2363 | } | |
2364 | dyn = htab->elf.dynamic_sections_created; | |
2365 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol | |
2366 | and two if global. | |
2367 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ | |
2368 | if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) | |
2369 | || tls_type == GOT_TLS_IE) | |
2370 | htab->elf.srelgot->size += bed->s->sizeof_rela; | |
2371 | else if (GOT_TLS_GD_P (tls_type)) | |
2372 | htab->elf.srelgot->size += 2 * bed->s->sizeof_rela; | |
2373 | else if (! GOT_TLS_GDESC_P (tls_type) | |
2374 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
2375 | || h->root.type != bfd_link_hash_undefweak) | |
2376 | && (info->shared | |
2377 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) | |
2378 | htab->elf.srelgot->size += bed->s->sizeof_rela; | |
2379 | if (GOT_TLS_GDESC_P (tls_type)) | |
2380 | { | |
2381 | htab->elf.srelplt->size += bed->s->sizeof_rela; | |
2382 | htab->tlsdesc_plt = (bfd_vma) -1; | |
2383 | } | |
2384 | } | |
2385 | else | |
2386 | h->got.offset = (bfd_vma) -1; | |
2387 | ||
2388 | if (eh->dyn_relocs == NULL) | |
2389 | return TRUE; | |
2390 | ||
2391 | /* In the shared -Bsymbolic case, discard space allocated for | |
2392 | dynamic pc-relative relocs against symbols which turn out to be | |
2393 | defined in regular objects. For the normal shared case, discard | |
2394 | space for pc-relative relocs that have become local due to symbol | |
2395 | visibility changes. */ | |
2396 | ||
2397 | if (info->shared) | |
2398 | { | |
2399 | /* Relocs that use pc_count are those that appear on a call | |
2400 | insn, or certain REL relocs that can generated via assembly. | |
2401 | We want calls to protected symbols to resolve directly to the | |
2402 | function rather than going via the plt. If people want | |
2403 | function pointer comparisons to work as expected then they | |
2404 | should avoid writing weird assembly. */ | |
2405 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
2406 | { | |
2407 | struct elf_dyn_relocs **pp; | |
2408 | ||
2409 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
2410 | { | |
2411 | p->count -= p->pc_count; | |
2412 | p->pc_count = 0; | |
2413 | if (p->count == 0) | |
2414 | *pp = p->next; | |
2415 | else | |
2416 | pp = &p->next; | |
2417 | } | |
2418 | } | |
2419 | ||
2420 | /* Also discard relocs on undefined weak syms with non-default | |
2421 | visibility. */ | |
2422 | if (eh->dyn_relocs != NULL | |
2423 | && h->root.type == bfd_link_hash_undefweak) | |
2424 | { | |
2425 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
2426 | eh->dyn_relocs = NULL; | |
2427 | ||
2428 | /* Make sure undefined weak symbols are output as a dynamic | |
2429 | symbol in PIEs. */ | |
2430 | else if (h->dynindx == -1 | |
2431 | && ! h->forced_local | |
2432 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2433 | return FALSE; | |
2434 | } | |
2435 | ||
2436 | } | |
2437 | else if (ELIMINATE_COPY_RELOCS) | |
2438 | { | |
2439 | /* For the non-shared case, discard space for relocs against | |
2440 | symbols which turn out to need copy relocs or are not | |
2441 | dynamic. */ | |
2442 | ||
2443 | if (!h->non_got_ref | |
2444 | && ((h->def_dynamic | |
2445 | && !h->def_regular) | |
2446 | || (htab->elf.dynamic_sections_created | |
2447 | && (h->root.type == bfd_link_hash_undefweak | |
2448 | || h->root.type == bfd_link_hash_undefined)))) | |
2449 | { | |
2450 | /* Make sure this symbol is output as a dynamic symbol. | |
2451 | Undefined weak syms won't yet be marked as dynamic. */ | |
2452 | if (h->dynindx == -1 | |
2453 | && ! h->forced_local | |
2454 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
2455 | return FALSE; | |
2456 | ||
2457 | /* If that succeeded, we know we'll be keeping all the | |
2458 | relocs. */ | |
2459 | if (h->dynindx != -1) | |
2460 | goto keep; | |
2461 | } | |
2462 | ||
2463 | eh->dyn_relocs = NULL; | |
2464 | ||
2465 | keep: ; | |
2466 | } | |
2467 | ||
2468 | /* Finally, allocate space. */ | |
2469 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
2470 | { | |
2471 | asection * sreloc; | |
2472 | ||
2473 | sreloc = elf_section_data (p->sec)->sreloc; | |
2474 | ||
2475 | BFD_ASSERT (sreloc != NULL); | |
2476 | ||
2477 | sreloc->size += p->count * bed->s->sizeof_rela; | |
2478 | } | |
2479 | ||
2480 | return TRUE; | |
2481 | } | |
2482 | ||
2483 | /* Allocate space in .plt, .got and associated reloc sections for | |
2484 | local dynamic relocs. */ | |
2485 | ||
2486 | static bfd_boolean | |
2487 | elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf) | |
2488 | { | |
2489 | struct elf_link_hash_entry *h | |
2490 | = (struct elf_link_hash_entry *) *slot; | |
2491 | ||
2492 | if (h->type != STT_GNU_IFUNC | |
2493 | || !h->def_regular | |
2494 | || !h->ref_regular | |
2495 | || !h->forced_local | |
2496 | || h->root.type != bfd_link_hash_defined) | |
2497 | abort (); | |
2498 | ||
2499 | return elf_x86_64_allocate_dynrelocs (h, inf); | |
2500 | } | |
2501 | ||
2502 | /* Find any dynamic relocs that apply to read-only sections. */ | |
2503 | ||
2504 | static bfd_boolean | |
2505 | elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, | |
2506 | void * inf) | |
2507 | { | |
2508 | struct elf_x86_64_link_hash_entry *eh; | |
2509 | struct elf_dyn_relocs *p; | |
2510 | ||
2511 | /* Skip local IFUNC symbols. */ | |
2512 | if (h->forced_local && h->type == STT_GNU_IFUNC) | |
2513 | return TRUE; | |
2514 | ||
2515 | eh = (struct elf_x86_64_link_hash_entry *) h; | |
2516 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
2517 | { | |
2518 | asection *s = p->sec->output_section; | |
2519 | ||
2520 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
2521 | { | |
2522 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
2523 | ||
2524 | info->flags |= DF_TEXTREL; | |
2525 | ||
2526 | if (info->warn_shared_textrel && info->shared) | |
2527 | info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"), | |
2528 | p->sec->owner, h->root.root.string, | |
2529 | p->sec); | |
2530 | ||
2531 | /* Not an error, just cut short the traversal. */ | |
2532 | return FALSE; | |
2533 | } | |
2534 | } | |
2535 | return TRUE; | |
2536 | } | |
2537 | ||
2538 | /* Convert | |
2539 | mov foo@GOTPCREL(%rip), %reg | |
2540 | to | |
2541 | lea foo(%rip), %reg | |
2542 | with the local symbol, foo. */ | |
2543 | ||
2544 | static bfd_boolean | |
2545 | elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec, | |
2546 | struct bfd_link_info *link_info) | |
2547 | { | |
2548 | Elf_Internal_Shdr *symtab_hdr; | |
2549 | Elf_Internal_Rela *internal_relocs; | |
2550 | Elf_Internal_Rela *irel, *irelend; | |
2551 | bfd_byte *contents; | |
2552 | struct elf_x86_64_link_hash_table *htab; | |
2553 | bfd_boolean changed_contents; | |
2554 | bfd_boolean changed_relocs; | |
2555 | bfd_signed_vma *local_got_refcounts; | |
2556 | ||
2557 | /* Don't even try to convert non-ELF outputs. */ | |
2558 | if (!is_elf_hash_table (link_info->hash)) | |
2559 | return FALSE; | |
2560 | ||
2561 | /* Nothing to do if there are no codes, no relocations or no output. */ | |
2562 | if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC) | |
2563 | || sec->reloc_count == 0 | |
2564 | || discarded_section (sec)) | |
2565 | return TRUE; | |
2566 | ||
2567 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
2568 | ||
2569 | /* Load the relocations for this section. */ | |
2570 | internal_relocs = (_bfd_elf_link_read_relocs | |
2571 | (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, | |
2572 | link_info->keep_memory)); | |
2573 | if (internal_relocs == NULL) | |
2574 | return FALSE; | |
2575 | ||
2576 | htab = elf_x86_64_hash_table (link_info); | |
2577 | changed_contents = FALSE; | |
2578 | changed_relocs = FALSE; | |
2579 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
2580 | ||
2581 | /* Get the section contents. */ | |
2582 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
2583 | contents = elf_section_data (sec)->this_hdr.contents; | |
2584 | else | |
2585 | { | |
2586 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) | |
2587 | goto error_return; | |
2588 | } | |
2589 | ||
2590 | irelend = internal_relocs + sec->reloc_count; | |
2591 | for (irel = internal_relocs; irel < irelend; irel++) | |
2592 | { | |
2593 | unsigned int r_type = ELF32_R_TYPE (irel->r_info); | |
2594 | unsigned int r_symndx = htab->r_sym (irel->r_info); | |
2595 | unsigned int indx; | |
2596 | struct elf_link_hash_entry *h; | |
2597 | ||
2598 | if (r_type != R_X86_64_GOTPCREL) | |
2599 | continue; | |
2600 | ||
2601 | /* Get the symbol referred to by the reloc. */ | |
2602 | if (r_symndx < symtab_hdr->sh_info) | |
2603 | { | |
2604 | Elf_Internal_Sym *isym; | |
2605 | ||
2606 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
2607 | abfd, r_symndx); | |
2608 | ||
2609 | /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */ | |
2610 | if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC | |
2611 | && bfd_get_8 (input_bfd, | |
2612 | contents + irel->r_offset - 2) == 0x8b) | |
2613 | { | |
2614 | bfd_put_8 (output_bfd, 0x8d, | |
2615 | contents + irel->r_offset - 2); | |
2616 | irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32); | |
2617 | if (local_got_refcounts != NULL | |
2618 | && local_got_refcounts[r_symndx] > 0) | |
2619 | local_got_refcounts[r_symndx] -= 1; | |
2620 | changed_contents = TRUE; | |
2621 | changed_relocs = TRUE; | |
2622 | } | |
2623 | continue; | |
2624 | } | |
2625 | ||
2626 | indx = r_symndx - symtab_hdr->sh_info; | |
2627 | h = elf_sym_hashes (abfd)[indx]; | |
2628 | BFD_ASSERT (h != NULL); | |
2629 | ||
2630 | while (h->root.type == bfd_link_hash_indirect | |
2631 | || h->root.type == bfd_link_hash_warning) | |
2632 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2633 | ||
2634 | /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also | |
2635 | avoid optimizing _DYNAMIC since ld.so may use its link-time | |
2636 | address. */ | |
2637 | if (h->def_regular | |
2638 | && h->type != STT_GNU_IFUNC | |
2639 | && h != htab->elf.hdynamic | |
2640 | && SYMBOL_REFERENCES_LOCAL (link_info, h) | |
2641 | && bfd_get_8 (input_bfd, | |
2642 | contents + irel->r_offset - 2) == 0x8b) | |
2643 | { | |
2644 | bfd_put_8 (output_bfd, 0x8d, | |
2645 | contents + irel->r_offset - 2); | |
2646 | irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32); | |
2647 | if (h->got.refcount > 0) | |
2648 | h->got.refcount -= 1; | |
2649 | changed_contents = TRUE; | |
2650 | changed_relocs = TRUE; | |
2651 | } | |
2652 | } | |
2653 | ||
2654 | if (contents != NULL | |
2655 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2656 | { | |
2657 | if (!changed_contents && !link_info->keep_memory) | |
2658 | free (contents); | |
2659 | else | |
2660 | { | |
2661 | /* Cache the section contents for elf_link_input_bfd. */ | |
2662 | elf_section_data (sec)->this_hdr.contents = contents; | |
2663 | } | |
2664 | } | |
2665 | ||
2666 | if (elf_section_data (sec)->relocs != internal_relocs) | |
2667 | { | |
2668 | if (!changed_relocs) | |
2669 | free (internal_relocs); | |
2670 | else | |
2671 | elf_section_data (sec)->relocs = internal_relocs; | |
2672 | } | |
2673 | ||
2674 | return TRUE; | |
2675 | ||
2676 | error_return: | |
2677 | if (contents != NULL | |
2678 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2679 | free (contents); | |
2680 | if (internal_relocs != NULL | |
2681 | && elf_section_data (sec)->relocs != internal_relocs) | |
2682 | free (internal_relocs); | |
2683 | return FALSE; | |
2684 | } | |
2685 | ||
2686 | /* Set the sizes of the dynamic sections. */ | |
2687 | ||
2688 | static bfd_boolean | |
2689 | elf_x86_64_size_dynamic_sections (bfd *output_bfd, | |
2690 | struct bfd_link_info *info) | |
2691 | { | |
2692 | struct elf_x86_64_link_hash_table *htab; | |
2693 | bfd *dynobj; | |
2694 | asection *s; | |
2695 | bfd_boolean relocs; | |
2696 | bfd *ibfd; | |
2697 | const struct elf_backend_data *bed; | |
2698 | ||
2699 | htab = elf_x86_64_hash_table (info); | |
2700 | if (htab == NULL) | |
2701 | return FALSE; | |
2702 | bed = get_elf_backend_data (output_bfd); | |
2703 | ||
2704 | dynobj = htab->elf.dynobj; | |
2705 | if (dynobj == NULL) | |
2706 | abort (); | |
2707 | ||
2708 | if (htab->elf.dynamic_sections_created) | |
2709 | { | |
2710 | /* Set the contents of the .interp section to the interpreter. */ | |
2711 | if (info->executable) | |
2712 | { | |
2713 | s = bfd_get_linker_section (dynobj, ".interp"); | |
2714 | if (s == NULL) | |
2715 | abort (); | |
2716 | s->size = htab->dynamic_interpreter_size; | |
2717 | s->contents = (unsigned char *) htab->dynamic_interpreter; | |
2718 | } | |
2719 | } | |
2720 | ||
2721 | /* Set up .got offsets for local syms, and space for local dynamic | |
2722 | relocs. */ | |
2723 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) | |
2724 | { | |
2725 | bfd_signed_vma *local_got; | |
2726 | bfd_signed_vma *end_local_got; | |
2727 | char *local_tls_type; | |
2728 | bfd_vma *local_tlsdesc_gotent; | |
2729 | bfd_size_type locsymcount; | |
2730 | Elf_Internal_Shdr *symtab_hdr; | |
2731 | asection *srel; | |
2732 | ||
2733 | if (! is_x86_64_elf (ibfd)) | |
2734 | continue; | |
2735 | ||
2736 | for (s = ibfd->sections; s != NULL; s = s->next) | |
2737 | { | |
2738 | struct elf_dyn_relocs *p; | |
2739 | ||
2740 | if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info)) | |
2741 | return FALSE; | |
2742 | ||
2743 | for (p = (struct elf_dyn_relocs *) | |
2744 | (elf_section_data (s)->local_dynrel); | |
2745 | p != NULL; | |
2746 | p = p->next) | |
2747 | { | |
2748 | if (!bfd_is_abs_section (p->sec) | |
2749 | && bfd_is_abs_section (p->sec->output_section)) | |
2750 | { | |
2751 | /* Input section has been discarded, either because | |
2752 | it is a copy of a linkonce section or due to | |
2753 | linker script /DISCARD/, so we'll be discarding | |
2754 | the relocs too. */ | |
2755 | } | |
2756 | else if (p->count != 0) | |
2757 | { | |
2758 | srel = elf_section_data (p->sec)->sreloc; | |
2759 | srel->size += p->count * bed->s->sizeof_rela; | |
2760 | if ((p->sec->output_section->flags & SEC_READONLY) != 0 | |
2761 | && (info->flags & DF_TEXTREL) == 0) | |
2762 | { | |
2763 | info->flags |= DF_TEXTREL; | |
2764 | if (info->warn_shared_textrel && info->shared) | |
2765 | info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"), | |
2766 | p->sec->owner, p->sec); | |
2767 | } | |
2768 | } | |
2769 | } | |
2770 | } | |
2771 | ||
2772 | local_got = elf_local_got_refcounts (ibfd); | |
2773 | if (!local_got) | |
2774 | continue; | |
2775 | ||
2776 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
2777 | locsymcount = symtab_hdr->sh_info; | |
2778 | end_local_got = local_got + locsymcount; | |
2779 | local_tls_type = elf_x86_64_local_got_tls_type (ibfd); | |
2780 | local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd); | |
2781 | s = htab->elf.sgot; | |
2782 | srel = htab->elf.srelgot; | |
2783 | for (; local_got < end_local_got; | |
2784 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) | |
2785 | { | |
2786 | *local_tlsdesc_gotent = (bfd_vma) -1; | |
2787 | if (*local_got > 0) | |
2788 | { | |
2789 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
2790 | { | |
2791 | *local_tlsdesc_gotent = htab->elf.sgotplt->size | |
2792 | - elf_x86_64_compute_jump_table_size (htab); | |
2793 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; | |
2794 | *local_got = (bfd_vma) -2; | |
2795 | } | |
2796 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
2797 | || GOT_TLS_GD_P (*local_tls_type)) | |
2798 | { | |
2799 | *local_got = s->size; | |
2800 | s->size += GOT_ENTRY_SIZE; | |
2801 | if (GOT_TLS_GD_P (*local_tls_type)) | |
2802 | s->size += GOT_ENTRY_SIZE; | |
2803 | } | |
2804 | if (info->shared | |
2805 | || GOT_TLS_GD_ANY_P (*local_tls_type) | |
2806 | || *local_tls_type == GOT_TLS_IE) | |
2807 | { | |
2808 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
2809 | { | |
2810 | htab->elf.srelplt->size | |
2811 | += bed->s->sizeof_rela; | |
2812 | htab->tlsdesc_plt = (bfd_vma) -1; | |
2813 | } | |
2814 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
2815 | || GOT_TLS_GD_P (*local_tls_type)) | |
2816 | srel->size += bed->s->sizeof_rela; | |
2817 | } | |
2818 | } | |
2819 | else | |
2820 | *local_got = (bfd_vma) -1; | |
2821 | } | |
2822 | } | |
2823 | ||
2824 | if (htab->tls_ld_got.refcount > 0) | |
2825 | { | |
2826 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD | |
2827 | relocs. */ | |
2828 | htab->tls_ld_got.offset = htab->elf.sgot->size; | |
2829 | htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; | |
2830 | htab->elf.srelgot->size += bed->s->sizeof_rela; | |
2831 | } | |
2832 | else | |
2833 | htab->tls_ld_got.offset = -1; | |
2834 | ||
2835 | /* Allocate global sym .plt and .got entries, and space for global | |
2836 | sym dynamic relocs. */ | |
2837 | elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs, | |
2838 | info); | |
2839 | ||
2840 | /* Allocate .plt and .got entries, and space for local symbols. */ | |
2841 | htab_traverse (htab->loc_hash_table, | |
2842 | elf_x86_64_allocate_local_dynrelocs, | |
2843 | info); | |
2844 | ||
2845 | /* For every jump slot reserved in the sgotplt, reloc_count is | |
2846 | incremented. However, when we reserve space for TLS descriptors, | |
2847 | it's not incremented, so in order to compute the space reserved | |
2848 | for them, it suffices to multiply the reloc count by the jump | |
2849 | slot size. | |
2850 | ||
2851 | PR ld/13302: We start next_irelative_index at the end of .rela.plt | |
2852 | so that R_X86_64_IRELATIVE entries come last. */ | |
2853 | if (htab->elf.srelplt) | |
2854 | { | |
2855 | htab->sgotplt_jump_table_size | |
2856 | = elf_x86_64_compute_jump_table_size (htab); | |
2857 | htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; | |
2858 | } | |
2859 | else if (htab->elf.irelplt) | |
2860 | htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; | |
2861 | ||
2862 | if (htab->tlsdesc_plt) | |
2863 | { | |
2864 | /* If we're not using lazy TLS relocations, don't generate the | |
2865 | PLT and GOT entries they require. */ | |
2866 | if ((info->flags & DF_BIND_NOW)) | |
2867 | htab->tlsdesc_plt = 0; | |
2868 | else | |
2869 | { | |
2870 | htab->tlsdesc_got = htab->elf.sgot->size; | |
2871 | htab->elf.sgot->size += GOT_ENTRY_SIZE; | |
2872 | /* Reserve room for the initial entry. | |
2873 | FIXME: we could probably do away with it in this case. */ | |
2874 | if (htab->elf.splt->size == 0) | |
2875 | htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd); | |
2876 | htab->tlsdesc_plt = htab->elf.splt->size; | |
2877 | htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd); | |
2878 | } | |
2879 | } | |
2880 | ||
2881 | if (htab->elf.sgotplt) | |
2882 | { | |
2883 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
2884 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ | |
2885 | if ((htab->elf.hgot == NULL | |
2886 | || !htab->elf.hgot->ref_regular_nonweak) | |
2887 | && (htab->elf.sgotplt->size | |
2888 | == get_elf_backend_data (output_bfd)->got_header_size) | |
2889 | && (htab->elf.splt == NULL | |
2890 | || htab->elf.splt->size == 0) | |
2891 | && (htab->elf.sgot == NULL | |
2892 | || htab->elf.sgot->size == 0) | |
2893 | && (htab->elf.iplt == NULL | |
2894 | || htab->elf.iplt->size == 0) | |
2895 | && (htab->elf.igotplt == NULL | |
2896 | || htab->elf.igotplt->size == 0)) | |
2897 | htab->elf.sgotplt->size = 0; | |
2898 | } | |
2899 | ||
2900 | if (htab->plt_eh_frame != NULL | |
2901 | && htab->elf.splt != NULL | |
2902 | && htab->elf.splt->size != 0 | |
2903 | && !bfd_is_abs_section (htab->elf.splt->output_section) | |
2904 | && _bfd_elf_eh_frame_present (info)) | |
2905 | { | |
2906 | const struct elf_x86_64_backend_data *arch_data | |
2907 | = (const struct elf_x86_64_backend_data *) bed->arch_data; | |
2908 | htab->plt_eh_frame->size = arch_data->eh_frame_plt_size; | |
2909 | } | |
2910 | ||
2911 | /* We now have determined the sizes of the various dynamic sections. | |
2912 | Allocate memory for them. */ | |
2913 | relocs = FALSE; | |
2914 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2915 | { | |
2916 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2917 | continue; | |
2918 | ||
2919 | if (s == htab->elf.splt | |
2920 | || s == htab->elf.sgot | |
2921 | || s == htab->elf.sgotplt | |
2922 | || s == htab->elf.iplt | |
2923 | || s == htab->elf.igotplt | |
2924 | || s == htab->plt_eh_frame | |
2925 | || s == htab->sdynbss) | |
2926 | { | |
2927 | /* Strip this section if we don't need it; see the | |
2928 | comment below. */ | |
2929 | } | |
2930 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) | |
2931 | { | |
2932 | if (s->size != 0 && s != htab->elf.srelplt) | |
2933 | relocs = TRUE; | |
2934 | ||
2935 | /* We use the reloc_count field as a counter if we need | |
2936 | to copy relocs into the output file. */ | |
2937 | if (s != htab->elf.srelplt) | |
2938 | s->reloc_count = 0; | |
2939 | } | |
2940 | else | |
2941 | { | |
2942 | /* It's not one of our sections, so don't allocate space. */ | |
2943 | continue; | |
2944 | } | |
2945 | ||
2946 | if (s->size == 0) | |
2947 | { | |
2948 | /* If we don't need this section, strip it from the | |
2949 | output file. This is mostly to handle .rela.bss and | |
2950 | .rela.plt. We must create both sections in | |
2951 | create_dynamic_sections, because they must be created | |
2952 | before the linker maps input sections to output | |
2953 | sections. The linker does that before | |
2954 | adjust_dynamic_symbol is called, and it is that | |
2955 | function which decides whether anything needs to go | |
2956 | into these sections. */ | |
2957 | ||
2958 | s->flags |= SEC_EXCLUDE; | |
2959 | continue; | |
2960 | } | |
2961 | ||
2962 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
2963 | continue; | |
2964 | ||
2965 | /* Allocate memory for the section contents. We use bfd_zalloc | |
2966 | here in case unused entries are not reclaimed before the | |
2967 | section's contents are written out. This should not happen, | |
2968 | but this way if it does, we get a R_X86_64_NONE reloc instead | |
2969 | of garbage. */ | |
2970 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); | |
2971 | if (s->contents == NULL) | |
2972 | return FALSE; | |
2973 | } | |
2974 | ||
2975 | if (htab->plt_eh_frame != NULL | |
2976 | && htab->plt_eh_frame->contents != NULL) | |
2977 | { | |
2978 | const struct elf_x86_64_backend_data *arch_data | |
2979 | = (const struct elf_x86_64_backend_data *) bed->arch_data; | |
2980 | ||
2981 | memcpy (htab->plt_eh_frame->contents, | |
2982 | arch_data->eh_frame_plt, htab->plt_eh_frame->size); | |
2983 | bfd_put_32 (dynobj, htab->elf.splt->size, | |
2984 | htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); | |
2985 | } | |
2986 | ||
2987 | if (htab->elf.dynamic_sections_created) | |
2988 | { | |
2989 | /* Add some entries to the .dynamic section. We fill in the | |
2990 | values later, in elf_x86_64_finish_dynamic_sections, but we | |
2991 | must add the entries now so that we get the correct size for | |
2992 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2993 | dynamic linker and used by the debugger. */ | |
2994 | #define add_dynamic_entry(TAG, VAL) \ | |
2995 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
2996 | ||
2997 | if (info->executable) | |
2998 | { | |
2999 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
3000 | return FALSE; | |
3001 | } | |
3002 | ||
3003 | if (htab->elf.splt->size != 0) | |
3004 | { | |
3005 | if (!add_dynamic_entry (DT_PLTGOT, 0) | |
3006 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
3007 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) | |
3008 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
3009 | return FALSE; | |
3010 | ||
3011 | if (htab->tlsdesc_plt | |
3012 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) | |
3013 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) | |
3014 | return FALSE; | |
3015 | } | |
3016 | ||
3017 | if (relocs) | |
3018 | { | |
3019 | if (!add_dynamic_entry (DT_RELA, 0) | |
3020 | || !add_dynamic_entry (DT_RELASZ, 0) | |
3021 | || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela)) | |
3022 | return FALSE; | |
3023 | ||
3024 | /* If any dynamic relocs apply to a read-only section, | |
3025 | then we need a DT_TEXTREL entry. */ | |
3026 | if ((info->flags & DF_TEXTREL) == 0) | |
3027 | elf_link_hash_traverse (&htab->elf, | |
3028 | elf_x86_64_readonly_dynrelocs, | |
3029 | info); | |
3030 | ||
3031 | if ((info->flags & DF_TEXTREL) != 0) | |
3032 | { | |
3033 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
3034 | return FALSE; | |
3035 | } | |
3036 | } | |
3037 | } | |
3038 | #undef add_dynamic_entry | |
3039 | ||
3040 | return TRUE; | |
3041 | } | |
3042 | ||
3043 | static bfd_boolean | |
3044 | elf_x86_64_always_size_sections (bfd *output_bfd, | |
3045 | struct bfd_link_info *info) | |
3046 | { | |
3047 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
3048 | ||
3049 | if (tls_sec) | |
3050 | { | |
3051 | struct elf_link_hash_entry *tlsbase; | |
3052 | ||
3053 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
3054 | "_TLS_MODULE_BASE_", | |
3055 | FALSE, FALSE, FALSE); | |
3056 | ||
3057 | if (tlsbase && tlsbase->type == STT_TLS) | |
3058 | { | |
3059 | struct elf_x86_64_link_hash_table *htab; | |
3060 | struct bfd_link_hash_entry *bh = NULL; | |
3061 | const struct elf_backend_data *bed | |
3062 | = get_elf_backend_data (output_bfd); | |
3063 | ||
3064 | htab = elf_x86_64_hash_table (info); | |
3065 | if (htab == NULL) | |
3066 | return FALSE; | |
3067 | ||
3068 | if (!(_bfd_generic_link_add_one_symbol | |
3069 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
3070 | tls_sec, 0, NULL, FALSE, | |
3071 | bed->collect, &bh))) | |
3072 | return FALSE; | |
3073 | ||
3074 | htab->tls_module_base = bh; | |
3075 | ||
3076 | tlsbase = (struct elf_link_hash_entry *)bh; | |
3077 | tlsbase->def_regular = 1; | |
3078 | tlsbase->other = STV_HIDDEN; | |
3079 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
3080 | } | |
3081 | } | |
3082 | ||
3083 | return TRUE; | |
3084 | } | |
3085 | ||
3086 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking | |
3087 | executables. Rather than setting it to the beginning of the TLS | |
3088 | section, we have to set it to the end. This function may be called | |
3089 | multiple times, it is idempotent. */ | |
3090 | ||
3091 | static void | |
3092 | elf_x86_64_set_tls_module_base (struct bfd_link_info *info) | |
3093 | { | |
3094 | struct elf_x86_64_link_hash_table *htab; | |
3095 | struct bfd_link_hash_entry *base; | |
3096 | ||
3097 | if (!info->executable) | |
3098 | return; | |
3099 | ||
3100 | htab = elf_x86_64_hash_table (info); | |
3101 | if (htab == NULL) | |
3102 | return; | |
3103 | ||
3104 | base = htab->tls_module_base; | |
3105 | if (base == NULL) | |
3106 | return; | |
3107 | ||
3108 | base->u.def.value = htab->elf.tls_size; | |
3109 | } | |
3110 | ||
3111 | /* Return the base VMA address which should be subtracted from real addresses | |
3112 | when resolving @dtpoff relocation. | |
3113 | This is PT_TLS segment p_vaddr. */ | |
3114 | ||
3115 | static bfd_vma | |
3116 | elf_x86_64_dtpoff_base (struct bfd_link_info *info) | |
3117 | { | |
3118 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
3119 | if (elf_hash_table (info)->tls_sec == NULL) | |
3120 | return 0; | |
3121 | return elf_hash_table (info)->tls_sec->vma; | |
3122 | } | |
3123 | ||
3124 | /* Return the relocation value for @tpoff relocation | |
3125 | if STT_TLS virtual address is ADDRESS. */ | |
3126 | ||
3127 | static bfd_vma | |
3128 | elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) | |
3129 | { | |
3130 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
3131 | const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); | |
3132 | bfd_vma static_tls_size; | |
3133 | ||
3134 | /* If tls_segment is NULL, we should have signalled an error already. */ | |
3135 | if (htab->tls_sec == NULL) | |
3136 | return 0; | |
3137 | ||
3138 | /* Consider special static TLS alignment requirements. */ | |
3139 | static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); | |
3140 | return address - static_tls_size - htab->tls_sec->vma; | |
3141 | } | |
3142 | ||
3143 | /* Is the instruction before OFFSET in CONTENTS a 32bit relative | |
3144 | branch? */ | |
3145 | ||
3146 | static bfd_boolean | |
3147 | is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) | |
3148 | { | |
3149 | /* Opcode Instruction | |
3150 | 0xe8 call | |
3151 | 0xe9 jump | |
3152 | 0x0f 0x8x conditional jump */ | |
3153 | return ((offset > 0 | |
3154 | && (contents [offset - 1] == 0xe8 | |
3155 | || contents [offset - 1] == 0xe9)) | |
3156 | || (offset > 1 | |
3157 | && contents [offset - 2] == 0x0f | |
3158 | && (contents [offset - 1] & 0xf0) == 0x80)); | |
3159 | } | |
3160 | ||
3161 | /* Relocate an x86_64 ELF section. */ | |
3162 | ||
3163 | static bfd_boolean | |
3164 | elf_x86_64_relocate_section (bfd *output_bfd, | |
3165 | struct bfd_link_info *info, | |
3166 | bfd *input_bfd, | |
3167 | asection *input_section, | |
3168 | bfd_byte *contents, | |
3169 | Elf_Internal_Rela *relocs, | |
3170 | Elf_Internal_Sym *local_syms, | |
3171 | asection **local_sections) | |
3172 | { | |
3173 | struct elf_x86_64_link_hash_table *htab; | |
3174 | Elf_Internal_Shdr *symtab_hdr; | |
3175 | struct elf_link_hash_entry **sym_hashes; | |
3176 | bfd_vma *local_got_offsets; | |
3177 | bfd_vma *local_tlsdesc_gotents; | |
3178 | Elf_Internal_Rela *rel; | |
3179 | Elf_Internal_Rela *relend; | |
3180 | const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); | |
3181 | ||
3182 | BFD_ASSERT (is_x86_64_elf (input_bfd)); | |
3183 | ||
3184 | htab = elf_x86_64_hash_table (info); | |
3185 | if (htab == NULL) | |
3186 | return FALSE; | |
3187 | symtab_hdr = &elf_symtab_hdr (input_bfd); | |
3188 | sym_hashes = elf_sym_hashes (input_bfd); | |
3189 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
3190 | local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd); | |
3191 | ||
3192 | elf_x86_64_set_tls_module_base (info); | |
3193 | ||
3194 | rel = relocs; | |
3195 | relend = relocs + input_section->reloc_count; | |
3196 | for (; rel < relend; rel++) | |
3197 | { | |
3198 | unsigned int r_type; | |
3199 | reloc_howto_type *howto; | |
3200 | unsigned long r_symndx; | |
3201 | struct elf_link_hash_entry *h; | |
3202 | Elf_Internal_Sym *sym; | |
3203 | asection *sec; | |
3204 | bfd_vma off, offplt; | |
3205 | bfd_vma relocation; | |
3206 | bfd_boolean unresolved_reloc; | |
3207 | bfd_reloc_status_type r; | |
3208 | int tls_type; | |
3209 | asection *base_got; | |
3210 | bfd_vma st_size; | |
3211 | ||
3212 | r_type = ELF32_R_TYPE (rel->r_info); | |
3213 | if (r_type == (int) R_X86_64_GNU_VTINHERIT | |
3214 | || r_type == (int) R_X86_64_GNU_VTENTRY) | |
3215 | continue; | |
3216 | ||
3217 | if (r_type >= (int) R_X86_64_standard) | |
3218 | { | |
3219 | (*_bfd_error_handler) | |
3220 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), | |
3221 | input_bfd, input_section, r_type); | |
3222 | bfd_set_error (bfd_error_bad_value); | |
3223 | return FALSE; | |
3224 | } | |
3225 | ||
3226 | if (r_type != (int) R_X86_64_32 | |
3227 | || ABI_64_P (output_bfd)) | |
3228 | howto = x86_64_elf_howto_table + r_type; | |
3229 | else | |
3230 | howto = (x86_64_elf_howto_table | |
3231 | + ARRAY_SIZE (x86_64_elf_howto_table) - 1); | |
3232 | r_symndx = htab->r_sym (rel->r_info); | |
3233 | h = NULL; | |
3234 | sym = NULL; | |
3235 | sec = NULL; | |
3236 | unresolved_reloc = FALSE; | |
3237 | if (r_symndx < symtab_hdr->sh_info) | |
3238 | { | |
3239 | sym = local_syms + r_symndx; | |
3240 | sec = local_sections[r_symndx]; | |
3241 | ||
3242 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, | |
3243 | &sec, rel); | |
3244 | st_size = sym->st_size; | |
3245 | ||
3246 | /* Relocate against local STT_GNU_IFUNC symbol. */ | |
3247 | if (!info->relocatable | |
3248 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) | |
3249 | { | |
3250 | h = elf_x86_64_get_local_sym_hash (htab, input_bfd, | |
3251 | rel, FALSE); | |
3252 | if (h == NULL) | |
3253 | abort (); | |
3254 | ||
3255 | /* Set STT_GNU_IFUNC symbol value. */ | |
3256 | h->root.u.def.value = sym->st_value; | |
3257 | h->root.u.def.section = sec; | |
3258 | } | |
3259 | } | |
3260 | else | |
3261 | { | |
3262 | bfd_boolean warned ATTRIBUTE_UNUSED; | |
3263 | ||
3264 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
3265 | r_symndx, symtab_hdr, sym_hashes, | |
3266 | h, sec, relocation, | |
3267 | unresolved_reloc, warned); | |
3268 | st_size = h->size; | |
3269 | } | |
3270 | ||
3271 | if (sec != NULL && discarded_section (sec)) | |
3272 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
3273 | rel, 1, relend, howto, 0, contents); | |
3274 | ||
3275 | if (info->relocatable) | |
3276 | continue; | |
3277 | ||
3278 | if (rel->r_addend == 0 && !ABI_64_P (output_bfd)) | |
3279 | { | |
3280 | if (r_type == R_X86_64_64) | |
3281 | { | |
3282 | /* For x32, treat R_X86_64_64 like R_X86_64_32 and | |
3283 | zero-extend it to 64bit if addend is zero. */ | |
3284 | r_type = R_X86_64_32; | |
3285 | memset (contents + rel->r_offset + 4, 0, 4); | |
3286 | } | |
3287 | else if (r_type == R_X86_64_SIZE64) | |
3288 | { | |
3289 | /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and | |
3290 | zero-extend it to 64bit if addend is zero. */ | |
3291 | r_type = R_X86_64_SIZE32; | |
3292 | memset (contents + rel->r_offset + 4, 0, 4); | |
3293 | } | |
3294 | } | |
3295 | ||
3296 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle | |
3297 | it here if it is defined in a non-shared object. */ | |
3298 | if (h != NULL | |
3299 | && h->type == STT_GNU_IFUNC | |
3300 | && h->def_regular) | |
3301 | { | |
3302 | asection *plt; | |
3303 | bfd_vma plt_index; | |
3304 | const char *name; | |
3305 | ||
3306 | if ((input_section->flags & SEC_ALLOC) == 0 | |
3307 | || h->plt.offset == (bfd_vma) -1) | |
3308 | abort (); | |
3309 | ||
3310 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
3311 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
3312 | relocation = (plt->output_section->vma | |
3313 | + plt->output_offset + h->plt.offset); | |
3314 | ||
3315 | switch (r_type) | |
3316 | { | |
3317 | default: | |
3318 | if (h->root.root.string) | |
3319 | name = h->root.root.string; | |
3320 | else | |
3321 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, | |
3322 | NULL); | |
3323 | (*_bfd_error_handler) | |
3324 | (_("%B: relocation %s against STT_GNU_IFUNC " | |
3325 | "symbol `%s' isn't handled by %s"), input_bfd, | |
3326 | x86_64_elf_howto_table[r_type].name, | |
3327 | name, __FUNCTION__); | |
3328 | bfd_set_error (bfd_error_bad_value); | |
3329 | return FALSE; | |
3330 | ||
3331 | case R_X86_64_32S: | |
3332 | if (info->shared) | |
3333 | abort (); | |
3334 | goto do_relocation; | |
3335 | ||
3336 | case R_X86_64_32: | |
3337 | if (ABI_64_P (output_bfd)) | |
3338 | goto do_relocation; | |
3339 | /* FALLTHROUGH */ | |
3340 | case R_X86_64_64: | |
3341 | if (rel->r_addend != 0) | |
3342 | { | |
3343 | if (h->root.root.string) | |
3344 | name = h->root.root.string; | |
3345 | else | |
3346 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, | |
3347 | sym, NULL); | |
3348 | (*_bfd_error_handler) | |
3349 | (_("%B: relocation %s against STT_GNU_IFUNC " | |
3350 | "symbol `%s' has non-zero addend: %d"), | |
3351 | input_bfd, x86_64_elf_howto_table[r_type].name, | |
3352 | name, rel->r_addend); | |
3353 | bfd_set_error (bfd_error_bad_value); | |
3354 | return FALSE; | |
3355 | } | |
3356 | ||
3357 | /* Generate dynamic relcoation only when there is a | |
3358 | non-GOT reference in a shared object. */ | |
3359 | if (info->shared && h->non_got_ref) | |
3360 | { | |
3361 | Elf_Internal_Rela outrel; | |
3362 | asection *sreloc; | |
3363 | ||
3364 | /* Need a dynamic relocation to get the real function | |
3365 | address. */ | |
3366 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, | |
3367 | info, | |
3368 | input_section, | |
3369 | rel->r_offset); | |
3370 | if (outrel.r_offset == (bfd_vma) -1 | |
3371 | || outrel.r_offset == (bfd_vma) -2) | |
3372 | abort (); | |
3373 | ||
3374 | outrel.r_offset += (input_section->output_section->vma | |
3375 | + input_section->output_offset); | |
3376 | ||
3377 | if (h->dynindx == -1 | |
3378 | || h->forced_local | |
3379 | || info->executable) | |
3380 | { | |
3381 | /* This symbol is resolved locally. */ | |
3382 | outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); | |
3383 | outrel.r_addend = (h->root.u.def.value | |
3384 | + h->root.u.def.section->output_section->vma | |
3385 | + h->root.u.def.section->output_offset); | |
3386 | } | |
3387 | else | |
3388 | { | |
3389 | outrel.r_info = htab->r_info (h->dynindx, r_type); | |
3390 | outrel.r_addend = 0; | |
3391 | } | |
3392 | ||
3393 | sreloc = htab->elf.irelifunc; | |
3394 | elf_append_rela (output_bfd, sreloc, &outrel); | |
3395 | ||
3396 | /* If this reloc is against an external symbol, we | |
3397 | do not want to fiddle with the addend. Otherwise, | |
3398 | we need to include the symbol value so that it | |
3399 | becomes an addend for the dynamic reloc. For an | |
3400 | internal symbol, we have updated addend. */ | |
3401 | continue; | |
3402 | } | |
3403 | /* FALLTHROUGH */ | |
3404 | case R_X86_64_PC32: | |
3405 | case R_X86_64_PC64: | |
3406 | case R_X86_64_PLT32: | |
3407 | goto do_relocation; | |
3408 | ||
3409 | case R_X86_64_GOTPCREL: | |
3410 | case R_X86_64_GOTPCREL64: | |
3411 | base_got = htab->elf.sgot; | |
3412 | off = h->got.offset; | |
3413 | ||
3414 | if (base_got == NULL) | |
3415 | abort (); | |
3416 | ||
3417 | if (off == (bfd_vma) -1) | |
3418 | { | |
3419 | /* We can't use h->got.offset here to save state, or | |
3420 | even just remember the offset, as finish_dynamic_symbol | |
3421 | would use that as offset into .got. */ | |
3422 | ||
3423 | if (htab->elf.splt != NULL) | |
3424 | { | |
3425 | plt_index = h->plt.offset / plt_entry_size - 1; | |
3426 | off = (plt_index + 3) * GOT_ENTRY_SIZE; | |
3427 | base_got = htab->elf.sgotplt; | |
3428 | } | |
3429 | else | |
3430 | { | |
3431 | plt_index = h->plt.offset / plt_entry_size; | |
3432 | off = plt_index * GOT_ENTRY_SIZE; | |
3433 | base_got = htab->elf.igotplt; | |
3434 | } | |
3435 | ||
3436 | if (h->dynindx == -1 | |
3437 | || h->forced_local | |
3438 | || info->symbolic) | |
3439 | { | |
3440 | /* This references the local defitionion. We must | |
3441 | initialize this entry in the global offset table. | |
3442 | Since the offset must always be a multiple of 8, | |
3443 | we use the least significant bit to record | |
3444 | whether we have initialized it already. | |
3445 | ||
3446 | When doing a dynamic link, we create a .rela.got | |
3447 | relocation entry to initialize the value. This | |
3448 | is done in the finish_dynamic_symbol routine. */ | |
3449 | if ((off & 1) != 0) | |
3450 | off &= ~1; | |
3451 | else | |
3452 | { | |
3453 | bfd_put_64 (output_bfd, relocation, | |
3454 | base_got->contents + off); | |
3455 | /* Note that this is harmless for the GOTPLT64 | |
3456 | case, as -1 | 1 still is -1. */ | |
3457 | h->got.offset |= 1; | |
3458 | } | |
3459 | } | |
3460 | } | |
3461 | ||
3462 | relocation = (base_got->output_section->vma | |
3463 | + base_got->output_offset + off); | |
3464 | ||
3465 | goto do_relocation; | |
3466 | } | |
3467 | } | |
3468 | ||
3469 | /* When generating a shared object, the relocations handled here are | |
3470 | copied into the output file to be resolved at run time. */ | |
3471 | switch (r_type) | |
3472 | { | |
3473 | case R_X86_64_GOT32: | |
3474 | case R_X86_64_GOT64: | |
3475 | /* Relocation is to the entry for this symbol in the global | |
3476 | offset table. */ | |
3477 | case R_X86_64_GOTPCREL: | |
3478 | case R_X86_64_GOTPCREL64: | |
3479 | /* Use global offset table entry as symbol value. */ | |
3480 | case R_X86_64_GOTPLT64: | |
3481 | /* This is the same as GOT64 for relocation purposes, but | |
3482 | indicates the existence of a PLT entry. The difficulty is, | |
3483 | that we must calculate the GOT slot offset from the PLT | |
3484 | offset, if this symbol got a PLT entry (it was global). | |
3485 | Additionally if it's computed from the PLT entry, then that | |
3486 | GOT offset is relative to .got.plt, not to .got. */ | |
3487 | base_got = htab->elf.sgot; | |
3488 | ||
3489 | if (htab->elf.sgot == NULL) | |
3490 | abort (); | |
3491 | ||
3492 | if (h != NULL) | |
3493 | { | |
3494 | bfd_boolean dyn; | |
3495 | ||
3496 | off = h->got.offset; | |
3497 | if (h->needs_plt | |
3498 | && h->plt.offset != (bfd_vma)-1 | |
3499 | && off == (bfd_vma)-1) | |
3500 | { | |
3501 | /* We can't use h->got.offset here to save | |
3502 | state, or even just remember the offset, as | |
3503 | finish_dynamic_symbol would use that as offset into | |
3504 | .got. */ | |
3505 | bfd_vma plt_index = h->plt.offset / plt_entry_size - 1; | |
3506 | off = (plt_index + 3) * GOT_ENTRY_SIZE; | |
3507 | base_got = htab->elf.sgotplt; | |
3508 | } | |
3509 | ||
3510 | dyn = htab->elf.dynamic_sections_created; | |
3511 | ||
3512 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) | |
3513 | || (info->shared | |
3514 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
3515 | || (ELF_ST_VISIBILITY (h->other) | |
3516 | && h->root.type == bfd_link_hash_undefweak)) | |
3517 | { | |
3518 | /* This is actually a static link, or it is a -Bsymbolic | |
3519 | link and the symbol is defined locally, or the symbol | |
3520 | was forced to be local because of a version file. We | |
3521 | must initialize this entry in the global offset table. | |
3522 | Since the offset must always be a multiple of 8, we | |
3523 | use the least significant bit to record whether we | |
3524 | have initialized it already. | |
3525 | ||
3526 | When doing a dynamic link, we create a .rela.got | |
3527 | relocation entry to initialize the value. This is | |
3528 | done in the finish_dynamic_symbol routine. */ | |
3529 | if ((off & 1) != 0) | |
3530 | off &= ~1; | |
3531 | else | |
3532 | { | |
3533 | bfd_put_64 (output_bfd, relocation, | |
3534 | base_got->contents + off); | |
3535 | /* Note that this is harmless for the GOTPLT64 case, | |
3536 | as -1 | 1 still is -1. */ | |
3537 | h->got.offset |= 1; | |
3538 | } | |
3539 | } | |
3540 | else | |
3541 | unresolved_reloc = FALSE; | |
3542 | } | |
3543 | else | |
3544 | { | |
3545 | if (local_got_offsets == NULL) | |
3546 | abort (); | |
3547 | ||
3548 | off = local_got_offsets[r_symndx]; | |
3549 | ||
3550 | /* The offset must always be a multiple of 8. We use | |
3551 | the least significant bit to record whether we have | |
3552 | already generated the necessary reloc. */ | |
3553 | if ((off & 1) != 0) | |
3554 | off &= ~1; | |
3555 | else | |
3556 | { | |
3557 | bfd_put_64 (output_bfd, relocation, | |
3558 | base_got->contents + off); | |
3559 | ||
3560 | if (info->shared) | |
3561 | { | |
3562 | asection *s; | |
3563 | Elf_Internal_Rela outrel; | |
3564 | ||
3565 | /* We need to generate a R_X86_64_RELATIVE reloc | |
3566 | for the dynamic linker. */ | |
3567 | s = htab->elf.srelgot; | |
3568 | if (s == NULL) | |
3569 | abort (); | |
3570 | ||
3571 | outrel.r_offset = (base_got->output_section->vma | |
3572 | + base_got->output_offset | |
3573 | + off); | |
3574 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); | |
3575 | outrel.r_addend = relocation; | |
3576 | elf_append_rela (output_bfd, s, &outrel); | |
3577 | } | |
3578 | ||
3579 | local_got_offsets[r_symndx] |= 1; | |
3580 | } | |
3581 | } | |
3582 | ||
3583 | if (off >= (bfd_vma) -2) | |
3584 | abort (); | |
3585 | ||
3586 | relocation = base_got->output_section->vma | |
3587 | + base_got->output_offset + off; | |
3588 | if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) | |
3589 | relocation -= htab->elf.sgotplt->output_section->vma | |
3590 | - htab->elf.sgotplt->output_offset; | |
3591 | ||
3592 | break; | |
3593 | ||
3594 | case R_X86_64_GOTOFF64: | |
3595 | /* Relocation is relative to the start of the global offset | |
3596 | table. */ | |
3597 | ||
3598 | /* Check to make sure it isn't a protected function symbol | |
3599 | for shared library since it may not be local when used | |
3600 | as function address. */ | |
3601 | if (!info->executable | |
3602 | && h | |
3603 | && !SYMBOLIC_BIND (info, h) | |
3604 | && h->def_regular | |
3605 | && h->type == STT_FUNC | |
3606 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) | |
3607 | { | |
3608 | (*_bfd_error_handler) | |
3609 | (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), | |
3610 | input_bfd, h->root.root.string); | |
3611 | bfd_set_error (bfd_error_bad_value); | |
3612 | return FALSE; | |
3613 | } | |
3614 | ||
3615 | /* Note that sgot is not involved in this | |
3616 | calculation. We always want the start of .got.plt. If we | |
3617 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is | |
3618 | permitted by the ABI, we might have to change this | |
3619 | calculation. */ | |
3620 | relocation -= htab->elf.sgotplt->output_section->vma | |
3621 | + htab->elf.sgotplt->output_offset; | |
3622 | break; | |
3623 | ||
3624 | case R_X86_64_GOTPC32: | |
3625 | case R_X86_64_GOTPC64: | |
3626 | /* Use global offset table as symbol value. */ | |
3627 | relocation = htab->elf.sgotplt->output_section->vma | |
3628 | + htab->elf.sgotplt->output_offset; | |
3629 | unresolved_reloc = FALSE; | |
3630 | break; | |
3631 | ||
3632 | case R_X86_64_PLTOFF64: | |
3633 | /* Relocation is PLT entry relative to GOT. For local | |
3634 | symbols it's the symbol itself relative to GOT. */ | |
3635 | if (h != NULL | |
3636 | /* See PLT32 handling. */ | |
3637 | && h->plt.offset != (bfd_vma) -1 | |
3638 | && htab->elf.splt != NULL) | |
3639 | { | |
3640 | relocation = (htab->elf.splt->output_section->vma | |
3641 | + htab->elf.splt->output_offset | |
3642 | + h->plt.offset); | |
3643 | unresolved_reloc = FALSE; | |
3644 | } | |
3645 | ||
3646 | relocation -= htab->elf.sgotplt->output_section->vma | |
3647 | + htab->elf.sgotplt->output_offset; | |
3648 | break; | |
3649 | ||
3650 | case R_X86_64_PLT32: | |
3651 | /* Relocation is to the entry for this symbol in the | |
3652 | procedure linkage table. */ | |
3653 | ||
3654 | /* Resolve a PLT32 reloc against a local symbol directly, | |
3655 | without using the procedure linkage table. */ | |
3656 | if (h == NULL) | |
3657 | break; | |
3658 | ||
3659 | if (h->plt.offset == (bfd_vma) -1 | |
3660 | || htab->elf.splt == NULL) | |
3661 | { | |
3662 | /* We didn't make a PLT entry for this symbol. This | |
3663 | happens when statically linking PIC code, or when | |
3664 | using -Bsymbolic. */ | |
3665 | break; | |
3666 | } | |
3667 | ||
3668 | relocation = (htab->elf.splt->output_section->vma | |
3669 | + htab->elf.splt->output_offset | |
3670 | + h->plt.offset); | |
3671 | unresolved_reloc = FALSE; | |
3672 | break; | |
3673 | ||
3674 | case R_X86_64_SIZE32: | |
3675 | case R_X86_64_SIZE64: | |
3676 | /* Set to symbol size. */ | |
3677 | relocation = st_size; | |
3678 | goto direct; | |
3679 | ||
3680 | case R_X86_64_PC8: | |
3681 | case R_X86_64_PC16: | |
3682 | case R_X86_64_PC32: | |
3683 | if (info->shared | |
3684 | && (input_section->flags & SEC_ALLOC) != 0 | |
3685 | && (input_section->flags & SEC_READONLY) != 0 | |
3686 | && h != NULL) | |
3687 | { | |
3688 | bfd_boolean fail = FALSE; | |
3689 | bfd_boolean branch | |
3690 | = (r_type == R_X86_64_PC32 | |
3691 | && is_32bit_relative_branch (contents, rel->r_offset)); | |
3692 | ||
3693 | if (SYMBOL_REFERENCES_LOCAL (info, h)) | |
3694 | { | |
3695 | /* Symbol is referenced locally. Make sure it is | |
3696 | defined locally or for a branch. */ | |
3697 | fail = !h->def_regular && !branch; | |
3698 | } | |
3699 | else | |
3700 | { | |
3701 | /* Symbol isn't referenced locally. We only allow | |
3702 | branch to symbol with non-default visibility. */ | |
3703 | fail = (!branch | |
3704 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT); | |
3705 | } | |
3706 | ||
3707 | if (fail) | |
3708 | { | |
3709 | const char *fmt; | |
3710 | const char *v; | |
3711 | const char *pic = ""; | |
3712 | ||
3713 | switch (ELF_ST_VISIBILITY (h->other)) | |
3714 | { | |
3715 | case STV_HIDDEN: | |
3716 | v = _("hidden symbol"); | |
3717 | break; | |
3718 | case STV_INTERNAL: | |
3719 | v = _("internal symbol"); | |
3720 | break; | |
3721 | case STV_PROTECTED: | |
3722 | v = _("protected symbol"); | |
3723 | break; | |
3724 | default: | |
3725 | v = _("symbol"); | |
3726 | pic = _("; recompile with -fPIC"); | |
3727 | break; | |
3728 | } | |
3729 | ||
3730 | if (h->def_regular) | |
3731 | fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s"); | |
3732 | else | |
3733 | fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s"); | |
3734 | ||
3735 | (*_bfd_error_handler) (fmt, input_bfd, | |
3736 | x86_64_elf_howto_table[r_type].name, | |
3737 | v, h->root.root.string, pic); | |
3738 | bfd_set_error (bfd_error_bad_value); | |
3739 | return FALSE; | |
3740 | } | |
3741 | } | |
3742 | /* Fall through. */ | |
3743 | ||
3744 | case R_X86_64_8: | |
3745 | case R_X86_64_16: | |
3746 | case R_X86_64_32: | |
3747 | case R_X86_64_PC64: | |
3748 | case R_X86_64_64: | |
3749 | /* FIXME: The ABI says the linker should make sure the value is | |
3750 | the same when it's zeroextended to 64 bit. */ | |
3751 | ||
3752 | direct: | |
3753 | if ((input_section->flags & SEC_ALLOC) == 0) | |
3754 | break; | |
3755 | ||
3756 | if ((info->shared | |
3757 | && (h == NULL | |
3758 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
3759 | || h->root.type != bfd_link_hash_undefweak) | |
3760 | && ((! IS_X86_64_PCREL_TYPE (r_type) | |
3761 | && r_type != R_X86_64_SIZE32 | |
3762 | && r_type != R_X86_64_SIZE64) | |
3763 | || ! SYMBOL_CALLS_LOCAL (info, h))) | |
3764 | || (ELIMINATE_COPY_RELOCS | |
3765 | && !info->shared | |
3766 | && h != NULL | |
3767 | && h->dynindx != -1 | |
3768 | && !h->non_got_ref | |
3769 | && ((h->def_dynamic | |
3770 | && !h->def_regular) | |
3771 | || h->root.type == bfd_link_hash_undefweak | |
3772 | || h->root.type == bfd_link_hash_undefined))) | |
3773 | { | |
3774 | Elf_Internal_Rela outrel; | |
3775 | bfd_boolean skip, relocate; | |
3776 | asection *sreloc; | |
3777 | ||
3778 | /* When generating a shared object, these relocations | |
3779 | are copied into the output file to be resolved at run | |
3780 | time. */ | |
3781 | skip = FALSE; | |
3782 | relocate = FALSE; | |
3783 | ||
3784 | outrel.r_offset = | |
3785 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
3786 | rel->r_offset); | |
3787 | if (outrel.r_offset == (bfd_vma) -1) | |
3788 | skip = TRUE; | |
3789 | else if (outrel.r_offset == (bfd_vma) -2) | |
3790 | skip = TRUE, relocate = TRUE; | |
3791 | ||
3792 | outrel.r_offset += (input_section->output_section->vma | |
3793 | + input_section->output_offset); | |
3794 | ||
3795 | if (skip) | |
3796 | memset (&outrel, 0, sizeof outrel); | |
3797 | ||
3798 | /* h->dynindx may be -1 if this symbol was marked to | |
3799 | become local. */ | |
3800 | else if (h != NULL | |
3801 | && h->dynindx != -1 | |
3802 | && (IS_X86_64_PCREL_TYPE (r_type) | |
3803 | || ! info->shared | |
3804 | || ! SYMBOLIC_BIND (info, h) | |
3805 | || ! h->def_regular)) | |
3806 | { | |
3807 | outrel.r_info = htab->r_info (h->dynindx, r_type); | |
3808 | outrel.r_addend = rel->r_addend; | |
3809 | } | |
3810 | else | |
3811 | { | |
3812 | /* This symbol is local, or marked to become local. */ | |
3813 | if (r_type == htab->pointer_r_type) | |
3814 | { | |
3815 | relocate = TRUE; | |
3816 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); | |
3817 | outrel.r_addend = relocation + rel->r_addend; | |
3818 | } | |
3819 | else if (r_type == R_X86_64_64 | |
3820 | && !ABI_64_P (output_bfd)) | |
3821 | { | |
3822 | relocate = TRUE; | |
3823 | outrel.r_info = htab->r_info (0, | |
3824 | R_X86_64_RELATIVE64); | |
3825 | outrel.r_addend = relocation + rel->r_addend; | |
3826 | /* Check addend overflow. */ | |
3827 | if ((outrel.r_addend & 0x80000000) | |
3828 | != (rel->r_addend & 0x80000000)) | |
3829 | { | |
3830 | const char *name; | |
3831 | int addend = rel->r_addend; | |
3832 | if (h && h->root.root.string) | |
3833 | name = h->root.root.string; | |
3834 | else | |
3835 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, | |
3836 | sym, NULL); | |
3837 | if (addend < 0) | |
3838 | (*_bfd_error_handler) | |
3839 | (_("%B: addend -0x%x in relocation %s against " | |
3840 | "symbol `%s' at 0x%lx in section `%A' is " | |
3841 | "out of range"), | |
3842 | input_bfd, input_section, addend, | |
3843 | x86_64_elf_howto_table[r_type].name, | |
3844 | name, (unsigned long) rel->r_offset); | |
3845 | else | |
3846 | (*_bfd_error_handler) | |
3847 | (_("%B: addend 0x%x in relocation %s against " | |
3848 | "symbol `%s' at 0x%lx in section `%A' is " | |
3849 | "out of range"), | |
3850 | input_bfd, input_section, addend, | |
3851 | x86_64_elf_howto_table[r_type].name, | |
3852 | name, (unsigned long) rel->r_offset); | |
3853 | bfd_set_error (bfd_error_bad_value); | |
3854 | return FALSE; | |
3855 | } | |
3856 | } | |
3857 | else | |
3858 | { | |
3859 | long sindx; | |
3860 | ||
3861 | if (bfd_is_abs_section (sec)) | |
3862 | sindx = 0; | |
3863 | else if (sec == NULL || sec->owner == NULL) | |
3864 | { | |
3865 | bfd_set_error (bfd_error_bad_value); | |
3866 | return FALSE; | |
3867 | } | |
3868 | else | |
3869 | { | |
3870 | asection *osec; | |
3871 | ||
3872 | /* We are turning this relocation into one | |
3873 | against a section symbol. It would be | |
3874 | proper to subtract the symbol's value, | |
3875 | osec->vma, from the emitted reloc addend, | |
3876 | but ld.so expects buggy relocs. */ | |
3877 | osec = sec->output_section; | |
3878 | sindx = elf_section_data (osec)->dynindx; | |
3879 | if (sindx == 0) | |
3880 | { | |
3881 | asection *oi = htab->elf.text_index_section; | |
3882 | sindx = elf_section_data (oi)->dynindx; | |
3883 | } | |
3884 | BFD_ASSERT (sindx != 0); | |
3885 | } | |
3886 | ||
3887 | outrel.r_info = htab->r_info (sindx, r_type); | |
3888 | outrel.r_addend = relocation + rel->r_addend; | |
3889 | } | |
3890 | } | |
3891 | ||
3892 | sreloc = elf_section_data (input_section)->sreloc; | |
3893 | ||
3894 | if (sreloc == NULL || sreloc->contents == NULL) | |
3895 | { | |
3896 | r = bfd_reloc_notsupported; | |
3897 | goto check_relocation_error; | |
3898 | } | |
3899 | ||
3900 | elf_append_rela (output_bfd, sreloc, &outrel); | |
3901 | ||
3902 | /* If this reloc is against an external symbol, we do | |
3903 | not want to fiddle with the addend. Otherwise, we | |
3904 | need to include the symbol value so that it becomes | |
3905 | an addend for the dynamic reloc. */ | |
3906 | if (! relocate) | |
3907 | continue; | |
3908 | } | |
3909 | ||
3910 | break; | |
3911 | ||
3912 | case R_X86_64_TLSGD: | |
3913 | case R_X86_64_GOTPC32_TLSDESC: | |
3914 | case R_X86_64_TLSDESC_CALL: | |
3915 | case R_X86_64_GOTTPOFF: | |
3916 | tls_type = GOT_UNKNOWN; | |
3917 | if (h == NULL && local_got_offsets) | |
3918 | tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx]; | |
3919 | else if (h != NULL) | |
3920 | tls_type = elf_x86_64_hash_entry (h)->tls_type; | |
3921 | ||
3922 | if (! elf_x86_64_tls_transition (info, input_bfd, | |
3923 | input_section, contents, | |
3924 | symtab_hdr, sym_hashes, | |
3925 | &r_type, tls_type, rel, | |
3926 | relend, h, r_symndx)) | |
3927 | return FALSE; | |
3928 | ||
3929 | if (r_type == R_X86_64_TPOFF32) | |
3930 | { | |
3931 | bfd_vma roff = rel->r_offset; | |
3932 | ||
3933 | BFD_ASSERT (! unresolved_reloc); | |
3934 | ||
3935 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) | |
3936 | { | |
3937 | /* GD->LE transition. For 64bit, change | |
3938 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
3939 | .word 0x6666; rex64; call __tls_get_addr | |
3940 | into: | |
3941 | movq %fs:0, %rax | |
3942 | leaq foo@tpoff(%rax), %rax | |
3943 | For 32bit, change | |
3944 | leaq foo@tlsgd(%rip), %rdi | |
3945 | .word 0x6666; rex64; call __tls_get_addr | |
3946 | into: | |
3947 | movl %fs:0, %eax | |
3948 | leaq foo@tpoff(%rax), %rax */ | |
3949 | if (ABI_64_P (output_bfd)) | |
3950 | memcpy (contents + roff - 4, | |
3951 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", | |
3952 | 16); | |
3953 | else | |
3954 | memcpy (contents + roff - 3, | |
3955 | "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", | |
3956 | 15); | |
3957 | bfd_put_32 (output_bfd, | |
3958 | elf_x86_64_tpoff (info, relocation), | |
3959 | contents + roff + 8); | |
3960 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ | |
3961 | rel++; | |
3962 | continue; | |
3963 | } | |
3964 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) | |
3965 | { | |
3966 | /* GDesc -> LE transition. | |
3967 | It's originally something like: | |
3968 | leaq x@tlsdesc(%rip), %rax | |
3969 | ||
3970 | Change it to: | |
3971 | movl $x@tpoff, %rax. */ | |
3972 | ||
3973 | unsigned int val, type; | |
3974 | ||
3975 | type = bfd_get_8 (input_bfd, contents + roff - 3); | |
3976 | val = bfd_get_8 (input_bfd, contents + roff - 1); | |
3977 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), | |
3978 | contents + roff - 3); | |
3979 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); | |
3980 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), | |
3981 | contents + roff - 1); | |
3982 | bfd_put_32 (output_bfd, | |
3983 | elf_x86_64_tpoff (info, relocation), | |
3984 | contents + roff); | |
3985 | continue; | |
3986 | } | |
3987 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) | |
3988 | { | |
3989 | /* GDesc -> LE transition. | |
3990 | It's originally: | |
3991 | call *(%rax) | |
3992 | Turn it into: | |
3993 | xchg %ax,%ax. */ | |
3994 | bfd_put_8 (output_bfd, 0x66, contents + roff); | |
3995 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); | |
3996 | continue; | |
3997 | } | |
3998 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF) | |
3999 | { | |
4000 | /* IE->LE transition: | |
4001 | Originally it can be one of: | |
4002 | movq foo@gottpoff(%rip), %reg | |
4003 | addq foo@gottpoff(%rip), %reg | |
4004 | We change it into: | |
4005 | movq $foo, %reg | |
4006 | leaq foo(%reg), %reg | |
4007 | addq $foo, %reg. */ | |
4008 | ||
4009 | unsigned int val, type, reg; | |
4010 | ||
4011 | val = bfd_get_8 (input_bfd, contents + roff - 3); | |
4012 | type = bfd_get_8 (input_bfd, contents + roff - 2); | |
4013 | reg = bfd_get_8 (input_bfd, contents + roff - 1); | |
4014 | reg >>= 3; | |
4015 | if (type == 0x8b) | |
4016 | { | |
4017 | /* movq */ | |
4018 | if (val == 0x4c) | |
4019 | bfd_put_8 (output_bfd, 0x49, | |
4020 | contents + roff - 3); | |
4021 | else if (!ABI_64_P (output_bfd) && val == 0x44) | |
4022 | bfd_put_8 (output_bfd, 0x41, | |
4023 | contents + roff - 3); | |
4024 | bfd_put_8 (output_bfd, 0xc7, | |
4025 | contents + roff - 2); | |
4026 | bfd_put_8 (output_bfd, 0xc0 | reg, | |
4027 | contents + roff - 1); | |
4028 | } | |
4029 | else if (reg == 4) | |
4030 | { | |
4031 | /* addq -> addq - addressing with %rsp/%r12 is | |
4032 | special */ | |
4033 | if (val == 0x4c) | |
4034 | bfd_put_8 (output_bfd, 0x49, | |
4035 | contents + roff - 3); | |
4036 | else if (!ABI_64_P (output_bfd) && val == 0x44) | |
4037 | bfd_put_8 (output_bfd, 0x41, | |
4038 | contents + roff - 3); | |
4039 | bfd_put_8 (output_bfd, 0x81, | |
4040 | contents + roff - 2); | |
4041 | bfd_put_8 (output_bfd, 0xc0 | reg, | |
4042 | contents + roff - 1); | |
4043 | } | |
4044 | else | |
4045 | { | |
4046 | /* addq -> leaq */ | |
4047 | if (val == 0x4c) | |
4048 | bfd_put_8 (output_bfd, 0x4d, | |
4049 | contents + roff - 3); | |
4050 | else if (!ABI_64_P (output_bfd) && val == 0x44) | |
4051 | bfd_put_8 (output_bfd, 0x45, | |
4052 | contents + roff - 3); | |
4053 | bfd_put_8 (output_bfd, 0x8d, | |
4054 | contents + roff - 2); | |
4055 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), | |
4056 | contents + roff - 1); | |
4057 | } | |
4058 | bfd_put_32 (output_bfd, | |
4059 | elf_x86_64_tpoff (info, relocation), | |
4060 | contents + roff); | |
4061 | continue; | |
4062 | } | |
4063 | else | |
4064 | BFD_ASSERT (FALSE); | |
4065 | } | |
4066 | ||
4067 | if (htab->elf.sgot == NULL) | |
4068 | abort (); | |
4069 | ||
4070 | if (h != NULL) | |
4071 | { | |
4072 | off = h->got.offset; | |
4073 | offplt = elf_x86_64_hash_entry (h)->tlsdesc_got; | |
4074 | } | |
4075 | else | |
4076 | { | |
4077 | if (local_got_offsets == NULL) | |
4078 | abort (); | |
4079 | ||
4080 | off = local_got_offsets[r_symndx]; | |
4081 | offplt = local_tlsdesc_gotents[r_symndx]; | |
4082 | } | |
4083 | ||
4084 | if ((off & 1) != 0) | |
4085 | off &= ~1; | |
4086 | else | |
4087 | { | |
4088 | Elf_Internal_Rela outrel; | |
4089 | int dr_type, indx; | |
4090 | asection *sreloc; | |
4091 | ||
4092 | if (htab->elf.srelgot == NULL) | |
4093 | abort (); | |
4094 | ||
4095 | indx = h && h->dynindx != -1 ? h->dynindx : 0; | |
4096 | ||
4097 | if (GOT_TLS_GDESC_P (tls_type)) | |
4098 | { | |
4099 | outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); | |
4100 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt | |
4101 | + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); | |
4102 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma | |
4103 | + htab->elf.sgotplt->output_offset | |
4104 | + offplt | |
4105 | + htab->sgotplt_jump_table_size); | |
4106 | sreloc = htab->elf.srelplt; | |
4107 | if (indx == 0) | |
4108 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); | |
4109 | else | |
4110 | outrel.r_addend = 0; | |
4111 | elf_append_rela (output_bfd, sreloc, &outrel); | |
4112 | } | |
4113 | ||
4114 | sreloc = htab->elf.srelgot; | |
4115 | ||
4116 | outrel.r_offset = (htab->elf.sgot->output_section->vma | |
4117 | + htab->elf.sgot->output_offset + off); | |
4118 | ||
4119 | if (GOT_TLS_GD_P (tls_type)) | |
4120 | dr_type = R_X86_64_DTPMOD64; | |
4121 | else if (GOT_TLS_GDESC_P (tls_type)) | |
4122 | goto dr_done; | |
4123 | else | |
4124 | dr_type = R_X86_64_TPOFF64; | |
4125 | ||
4126 | bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); | |
4127 | outrel.r_addend = 0; | |
4128 | if ((dr_type == R_X86_64_TPOFF64 | |
4129 | || dr_type == R_X86_64_TLSDESC) && indx == 0) | |
4130 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); | |
4131 | outrel.r_info = htab->r_info (indx, dr_type); | |
4132 | ||
4133 | elf_append_rela (output_bfd, sreloc, &outrel); | |
4134 | ||
4135 | if (GOT_TLS_GD_P (tls_type)) | |
4136 | { | |
4137 | if (indx == 0) | |
4138 | { | |
4139 | BFD_ASSERT (! unresolved_reloc); | |
4140 | bfd_put_64 (output_bfd, | |
4141 | relocation - elf_x86_64_dtpoff_base (info), | |
4142 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
4143 | } | |
4144 | else | |
4145 | { | |
4146 | bfd_put_64 (output_bfd, 0, | |
4147 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
4148 | outrel.r_info = htab->r_info (indx, | |
4149 | R_X86_64_DTPOFF64); | |
4150 | outrel.r_offset += GOT_ENTRY_SIZE; | |
4151 | elf_append_rela (output_bfd, sreloc, | |
4152 | &outrel); | |
4153 | } | |
4154 | } | |
4155 | ||
4156 | dr_done: | |
4157 | if (h != NULL) | |
4158 | h->got.offset |= 1; | |
4159 | else | |
4160 | local_got_offsets[r_symndx] |= 1; | |
4161 | } | |
4162 | ||
4163 | if (off >= (bfd_vma) -2 | |
4164 | && ! GOT_TLS_GDESC_P (tls_type)) | |
4165 | abort (); | |
4166 | if (r_type == ELF32_R_TYPE (rel->r_info)) | |
4167 | { | |
4168 | if (r_type == R_X86_64_GOTPC32_TLSDESC | |
4169 | || r_type == R_X86_64_TLSDESC_CALL) | |
4170 | relocation = htab->elf.sgotplt->output_section->vma | |
4171 | + htab->elf.sgotplt->output_offset | |
4172 | + offplt + htab->sgotplt_jump_table_size; | |
4173 | else | |
4174 | relocation = htab->elf.sgot->output_section->vma | |
4175 | + htab->elf.sgot->output_offset + off; | |
4176 | unresolved_reloc = FALSE; | |
4177 | } | |
4178 | else | |
4179 | { | |
4180 | bfd_vma roff = rel->r_offset; | |
4181 | ||
4182 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) | |
4183 | { | |
4184 | /* GD->IE transition. For 64bit, change | |
4185 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi | |
4186 | .word 0x6666; rex64; call __tls_get_addr@plt | |
4187 | into: | |
4188 | movq %fs:0, %rax | |
4189 | addq foo@gottpoff(%rip), %rax | |
4190 | For 32bit, change | |
4191 | leaq foo@tlsgd(%rip), %rdi | |
4192 | .word 0x6666; rex64; call __tls_get_addr@plt | |
4193 | into: | |
4194 | movl %fs:0, %eax | |
4195 | addq foo@gottpoff(%rip), %rax */ | |
4196 | if (ABI_64_P (output_bfd)) | |
4197 | memcpy (contents + roff - 4, | |
4198 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", | |
4199 | 16); | |
4200 | else | |
4201 | memcpy (contents + roff - 3, | |
4202 | "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", | |
4203 | 15); | |
4204 | ||
4205 | relocation = (htab->elf.sgot->output_section->vma | |
4206 | + htab->elf.sgot->output_offset + off | |
4207 | - roff | |
4208 | - input_section->output_section->vma | |
4209 | - input_section->output_offset | |
4210 | - 12); | |
4211 | bfd_put_32 (output_bfd, relocation, | |
4212 | contents + roff + 8); | |
4213 | /* Skip R_X86_64_PLT32. */ | |
4214 | rel++; | |
4215 | continue; | |
4216 | } | |
4217 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) | |
4218 | { | |
4219 | /* GDesc -> IE transition. | |
4220 | It's originally something like: | |
4221 | leaq x@tlsdesc(%rip), %rax | |
4222 | ||
4223 | Change it to: | |
4224 | movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */ | |
4225 | ||
4226 | /* Now modify the instruction as appropriate. To | |
4227 | turn a leaq into a movq in the form we use it, it | |
4228 | suffices to change the second byte from 0x8d to | |
4229 | 0x8b. */ | |
4230 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); | |
4231 | ||
4232 | bfd_put_32 (output_bfd, | |
4233 | htab->elf.sgot->output_section->vma | |
4234 | + htab->elf.sgot->output_offset + off | |
4235 | - rel->r_offset | |
4236 | - input_section->output_section->vma | |
4237 | - input_section->output_offset | |
4238 | - 4, | |
4239 | contents + roff); | |
4240 | continue; | |
4241 | } | |
4242 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) | |
4243 | { | |
4244 | /* GDesc -> IE transition. | |
4245 | It's originally: | |
4246 | call *(%rax) | |
4247 | ||
4248 | Change it to: | |
4249 | xchg %ax, %ax. */ | |
4250 | ||
4251 | bfd_put_8 (output_bfd, 0x66, contents + roff); | |
4252 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); | |
4253 | continue; | |
4254 | } | |
4255 | else | |
4256 | BFD_ASSERT (FALSE); | |
4257 | } | |
4258 | break; | |
4259 | ||
4260 | case R_X86_64_TLSLD: | |
4261 | if (! elf_x86_64_tls_transition (info, input_bfd, | |
4262 | input_section, contents, | |
4263 | symtab_hdr, sym_hashes, | |
4264 | &r_type, GOT_UNKNOWN, | |
4265 | rel, relend, h, r_symndx)) | |
4266 | return FALSE; | |
4267 | ||
4268 | if (r_type != R_X86_64_TLSLD) | |
4269 | { | |
4270 | /* LD->LE transition: | |
4271 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr. | |
4272 | For 64bit, we change it into: | |
4273 | .word 0x6666; .byte 0x66; movq %fs:0, %rax. | |
4274 | For 32bit, we change it into: | |
4275 | nopl 0x0(%rax); movl %fs:0, %eax. */ | |
4276 | ||
4277 | BFD_ASSERT (r_type == R_X86_64_TPOFF32); | |
4278 | if (ABI_64_P (output_bfd)) | |
4279 | memcpy (contents + rel->r_offset - 3, | |
4280 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); | |
4281 | else | |
4282 | memcpy (contents + rel->r_offset - 3, | |
4283 | "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); | |
4284 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ | |
4285 | rel++; | |
4286 | continue; | |
4287 | } | |
4288 | ||
4289 | if (htab->elf.sgot == NULL) | |
4290 | abort (); | |
4291 | ||
4292 | off = htab->tls_ld_got.offset; | |
4293 | if (off & 1) | |
4294 | off &= ~1; | |
4295 | else | |
4296 | { | |
4297 | Elf_Internal_Rela outrel; | |
4298 | ||
4299 | if (htab->elf.srelgot == NULL) | |
4300 | abort (); | |
4301 | ||
4302 | outrel.r_offset = (htab->elf.sgot->output_section->vma | |
4303 | + htab->elf.sgot->output_offset + off); | |
4304 | ||
4305 | bfd_put_64 (output_bfd, 0, | |
4306 | htab->elf.sgot->contents + off); | |
4307 | bfd_put_64 (output_bfd, 0, | |
4308 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); | |
4309 | outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); | |
4310 | outrel.r_addend = 0; | |
4311 | elf_append_rela (output_bfd, htab->elf.srelgot, | |
4312 | &outrel); | |
4313 | htab->tls_ld_got.offset |= 1; | |
4314 | } | |
4315 | relocation = htab->elf.sgot->output_section->vma | |
4316 | + htab->elf.sgot->output_offset + off; | |
4317 | unresolved_reloc = FALSE; | |
4318 | break; | |
4319 | ||
4320 | case R_X86_64_DTPOFF32: | |
4321 | if (!info->executable|| (input_section->flags & SEC_CODE) == 0) | |
4322 | relocation -= elf_x86_64_dtpoff_base (info); | |
4323 | else | |
4324 | relocation = elf_x86_64_tpoff (info, relocation); | |
4325 | break; | |
4326 | ||
4327 | case R_X86_64_TPOFF32: | |
4328 | case R_X86_64_TPOFF64: | |
4329 | BFD_ASSERT (info->executable); | |
4330 | relocation = elf_x86_64_tpoff (info, relocation); | |
4331 | break; | |
4332 | ||
4333 | default: | |
4334 | break; | |
4335 | } | |
4336 | ||
4337 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections | |
4338 | because such sections are not SEC_ALLOC and thus ld.so will | |
4339 | not process them. */ | |
4340 | if (unresolved_reloc | |
4341 | && !((input_section->flags & SEC_DEBUGGING) != 0 | |
4342 | && h->def_dynamic) | |
4343 | && _bfd_elf_section_offset (output_bfd, info, input_section, | |
4344 | rel->r_offset) != (bfd_vma) -1) | |
4345 | { | |
4346 | (*_bfd_error_handler) | |
4347 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), | |
4348 | input_bfd, | |
4349 | input_section, | |
4350 | (long) rel->r_offset, | |
4351 | howto->name, | |
4352 | h->root.root.string); | |
4353 | return FALSE; | |
4354 | } | |
4355 | ||
4356 | do_relocation: | |
4357 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
4358 | contents, rel->r_offset, | |
4359 | relocation, rel->r_addend); | |
4360 | ||
4361 | check_relocation_error: | |
4362 | if (r != bfd_reloc_ok) | |
4363 | { | |
4364 | const char *name; | |
4365 | ||
4366 | if (h != NULL) | |
4367 | name = h->root.root.string; | |
4368 | else | |
4369 | { | |
4370 | name = bfd_elf_string_from_elf_section (input_bfd, | |
4371 | symtab_hdr->sh_link, | |
4372 | sym->st_name); | |
4373 | if (name == NULL) | |
4374 | return FALSE; | |
4375 | if (*name == '\0') | |
4376 | name = bfd_section_name (input_bfd, sec); | |
4377 | } | |
4378 | ||
4379 | if (r == bfd_reloc_overflow) | |
4380 | { | |
4381 | if (! ((*info->callbacks->reloc_overflow) | |
4382 | (info, (h ? &h->root : NULL), name, howto->name, | |
4383 | (bfd_vma) 0, input_bfd, input_section, | |
4384 | rel->r_offset))) | |
4385 | return FALSE; | |
4386 | } | |
4387 | else | |
4388 | { | |
4389 | (*_bfd_error_handler) | |
4390 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), | |
4391 | input_bfd, input_section, | |
4392 | (long) rel->r_offset, name, (int) r); | |
4393 | return FALSE; | |
4394 | } | |
4395 | } | |
4396 | } | |
4397 | ||
4398 | return TRUE; | |
4399 | } | |
4400 | ||
4401 | /* Finish up dynamic symbol handling. We set the contents of various | |
4402 | dynamic sections here. */ | |
4403 | ||
4404 | static bfd_boolean | |
4405 | elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, | |
4406 | struct bfd_link_info *info, | |
4407 | struct elf_link_hash_entry *h, | |
4408 | Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) | |
4409 | { | |
4410 | struct elf_x86_64_link_hash_table *htab; | |
4411 | const struct elf_x86_64_backend_data *const abed | |
4412 | = get_elf_x86_64_backend_data (output_bfd); | |
4413 | ||
4414 | htab = elf_x86_64_hash_table (info); | |
4415 | if (htab == NULL) | |
4416 | return FALSE; | |
4417 | ||
4418 | if (h->plt.offset != (bfd_vma) -1) | |
4419 | { | |
4420 | bfd_vma plt_index; | |
4421 | bfd_vma got_offset; | |
4422 | Elf_Internal_Rela rela; | |
4423 | bfd_byte *loc; | |
4424 | asection *plt, *gotplt, *relplt; | |
4425 | const struct elf_backend_data *bed; | |
4426 | ||
4427 | /* When building a static executable, use .iplt, .igot.plt and | |
4428 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ | |
4429 | if (htab->elf.splt != NULL) | |
4430 | { | |
4431 | plt = htab->elf.splt; | |
4432 | gotplt = htab->elf.sgotplt; | |
4433 | relplt = htab->elf.srelplt; | |
4434 | } | |
4435 | else | |
4436 | { | |
4437 | plt = htab->elf.iplt; | |
4438 | gotplt = htab->elf.igotplt; | |
4439 | relplt = htab->elf.irelplt; | |
4440 | } | |
4441 | ||
4442 | /* This symbol has an entry in the procedure linkage table. Set | |
4443 | it up. */ | |
4444 | if ((h->dynindx == -1 | |
4445 | && !((h->forced_local || info->executable) | |
4446 | && h->def_regular | |
4447 | && h->type == STT_GNU_IFUNC)) | |
4448 | || plt == NULL | |
4449 | || gotplt == NULL | |
4450 | || relplt == NULL) | |
4451 | abort (); | |
4452 | ||
4453 | /* Get the index in the procedure linkage table which | |
4454 | corresponds to this symbol. This is the index of this symbol | |
4455 | in all the symbols for which we are making plt entries. The | |
4456 | first entry in the procedure linkage table is reserved. | |
4457 | ||
4458 | Get the offset into the .got table of the entry that | |
4459 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE | |
4460 | bytes. The first three are reserved for the dynamic linker. | |
4461 | ||
4462 | For static executables, we don't reserve anything. */ | |
4463 | ||
4464 | if (plt == htab->elf.splt) | |
4465 | { | |
4466 | got_offset = h->plt.offset / abed->plt_entry_size - 1; | |
4467 | got_offset = (got_offset + 3) * GOT_ENTRY_SIZE; | |
4468 | } | |
4469 | else | |
4470 | { | |
4471 | got_offset = h->plt.offset / abed->plt_entry_size; | |
4472 | got_offset = got_offset * GOT_ENTRY_SIZE; | |
4473 | } | |
4474 | ||
4475 | /* Fill in the entry in the procedure linkage table. */ | |
4476 | memcpy (plt->contents + h->plt.offset, abed->plt_entry, | |
4477 | abed->plt_entry_size); | |
4478 | ||
4479 | /* Insert the relocation positions of the plt section. */ | |
4480 | ||
4481 | /* Put offset the PC-relative instruction referring to the GOT entry, | |
4482 | subtracting the size of that instruction. */ | |
4483 | bfd_put_32 (output_bfd, | |
4484 | (gotplt->output_section->vma | |
4485 | + gotplt->output_offset | |
4486 | + got_offset | |
4487 | - plt->output_section->vma | |
4488 | - plt->output_offset | |
4489 | - h->plt.offset | |
4490 | - abed->plt_got_insn_size), | |
4491 | plt->contents + h->plt.offset + abed->plt_got_offset); | |
4492 | ||
4493 | /* Fill in the entry in the global offset table, initially this | |
4494 | points to the second part of the PLT entry. */ | |
4495 | bfd_put_64 (output_bfd, (plt->output_section->vma | |
4496 | + plt->output_offset | |
4497 | + h->plt.offset + abed->plt_lazy_offset), | |
4498 | gotplt->contents + got_offset); | |
4499 | ||
4500 | /* Fill in the entry in the .rela.plt section. */ | |
4501 | rela.r_offset = (gotplt->output_section->vma | |
4502 | + gotplt->output_offset | |
4503 | + got_offset); | |
4504 | if (h->dynindx == -1 | |
4505 | || ((info->executable | |
4506 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
4507 | && h->def_regular | |
4508 | && h->type == STT_GNU_IFUNC)) | |
4509 | { | |
4510 | /* If an STT_GNU_IFUNC symbol is locally defined, generate | |
4511 | R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ | |
4512 | rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); | |
4513 | rela.r_addend = (h->root.u.def.value | |
4514 | + h->root.u.def.section->output_section->vma | |
4515 | + h->root.u.def.section->output_offset); | |
4516 | /* R_X86_64_IRELATIVE comes last. */ | |
4517 | plt_index = htab->next_irelative_index--; | |
4518 | } | |
4519 | else | |
4520 | { | |
4521 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); | |
4522 | rela.r_addend = 0; | |
4523 | plt_index = htab->next_jump_slot_index++; | |
4524 | } | |
4525 | ||
4526 | /* Don't fill PLT entry for static executables. */ | |
4527 | if (plt == htab->elf.splt) | |
4528 | { | |
4529 | /* Put relocation index. */ | |
4530 | bfd_put_32 (output_bfd, plt_index, | |
4531 | plt->contents + h->plt.offset + abed->plt_reloc_offset); | |
4532 | /* Put offset for jmp .PLT0. */ | |
4533 | bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end), | |
4534 | plt->contents + h->plt.offset + abed->plt_plt_offset); | |
4535 | } | |
4536 | ||
4537 | bed = get_elf_backend_data (output_bfd); | |
4538 | loc = relplt->contents + plt_index * bed->s->sizeof_rela; | |
4539 | bed->s->swap_reloca_out (output_bfd, &rela, loc); | |
4540 | ||
4541 | if (!h->def_regular) | |
4542 | { | |
4543 | /* Mark the symbol as undefined, rather than as defined in | |
4544 | the .plt section. Leave the value if there were any | |
4545 | relocations where pointer equality matters (this is a clue | |
4546 | for the dynamic linker, to make function pointer | |
4547 | comparisons work between an application and shared | |
4548 | library), otherwise set it to zero. If a function is only | |
4549 | called from a binary, there is no need to slow down | |
4550 | shared libraries because of that. */ | |
4551 | sym->st_shndx = SHN_UNDEF; | |
4552 | if (!h->pointer_equality_needed) | |
4553 | sym->st_value = 0; | |
4554 | } | |
4555 | } | |
4556 | ||
4557 | if (h->got.offset != (bfd_vma) -1 | |
4558 | && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type) | |
4559 | && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) | |
4560 | { | |
4561 | Elf_Internal_Rela rela; | |
4562 | ||
4563 | /* This symbol has an entry in the global offset table. Set it | |
4564 | up. */ | |
4565 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) | |
4566 | abort (); | |
4567 | ||
4568 | rela.r_offset = (htab->elf.sgot->output_section->vma | |
4569 | + htab->elf.sgot->output_offset | |
4570 | + (h->got.offset &~ (bfd_vma) 1)); | |
4571 | ||
4572 | /* If this is a static link, or it is a -Bsymbolic link and the | |
4573 | symbol is defined locally or was forced to be local because | |
4574 | of a version file, we just want to emit a RELATIVE reloc. | |
4575 | The entry in the global offset table will already have been | |
4576 | initialized in the relocate_section function. */ | |
4577 | if (h->def_regular | |
4578 | && h->type == STT_GNU_IFUNC) | |
4579 | { | |
4580 | if (info->shared) | |
4581 | { | |
4582 | /* Generate R_X86_64_GLOB_DAT. */ | |
4583 | goto do_glob_dat; | |
4584 | } | |
4585 | else | |
4586 | { | |
4587 | asection *plt; | |
4588 | ||
4589 | if (!h->pointer_equality_needed) | |
4590 | abort (); | |
4591 | ||
4592 | /* For non-shared object, we can't use .got.plt, which | |
4593 | contains the real function addres if we need pointer | |
4594 | equality. We load the GOT entry with the PLT entry. */ | |
4595 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
4596 | bfd_put_64 (output_bfd, (plt->output_section->vma | |
4597 | + plt->output_offset | |
4598 | + h->plt.offset), | |
4599 | htab->elf.sgot->contents + h->got.offset); | |
4600 | return TRUE; | |
4601 | } | |
4602 | } | |
4603 | else if (info->shared | |
4604 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
4605 | { | |
4606 | if (!h->def_regular) | |
4607 | return FALSE; | |
4608 | BFD_ASSERT((h->got.offset & 1) != 0); | |
4609 | rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); | |
4610 | rela.r_addend = (h->root.u.def.value | |
4611 | + h->root.u.def.section->output_section->vma | |
4612 | + h->root.u.def.section->output_offset); | |
4613 | } | |
4614 | else | |
4615 | { | |
4616 | BFD_ASSERT((h->got.offset & 1) == 0); | |
4617 | do_glob_dat: | |
4618 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
4619 | htab->elf.sgot->contents + h->got.offset); | |
4620 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); | |
4621 | rela.r_addend = 0; | |
4622 | } | |
4623 | ||
4624 | elf_append_rela (output_bfd, htab->elf.srelgot, &rela); | |
4625 | } | |
4626 | ||
4627 | if (h->needs_copy) | |
4628 | { | |
4629 | Elf_Internal_Rela rela; | |
4630 | ||
4631 | /* This symbol needs a copy reloc. Set it up. */ | |
4632 | ||
4633 | if (h->dynindx == -1 | |
4634 | || (h->root.type != bfd_link_hash_defined | |
4635 | && h->root.type != bfd_link_hash_defweak) | |
4636 | || htab->srelbss == NULL) | |
4637 | abort (); | |
4638 | ||
4639 | rela.r_offset = (h->root.u.def.value | |
4640 | + h->root.u.def.section->output_section->vma | |
4641 | + h->root.u.def.section->output_offset); | |
4642 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); | |
4643 | rela.r_addend = 0; | |
4644 | elf_append_rela (output_bfd, htab->srelbss, &rela); | |
4645 | } | |
4646 | ||
4647 | return TRUE; | |
4648 | } | |
4649 | ||
4650 | /* Finish up local dynamic symbol handling. We set the contents of | |
4651 | various dynamic sections here. */ | |
4652 | ||
4653 | static bfd_boolean | |
4654 | elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) | |
4655 | { | |
4656 | struct elf_link_hash_entry *h | |
4657 | = (struct elf_link_hash_entry *) *slot; | |
4658 | struct bfd_link_info *info | |
4659 | = (struct bfd_link_info *) inf; | |
4660 | ||
4661 | return elf_x86_64_finish_dynamic_symbol (info->output_bfd, | |
4662 | info, h, NULL); | |
4663 | } | |
4664 | ||
4665 | /* Used to decide how to sort relocs in an optimal manner for the | |
4666 | dynamic linker, before writing them out. */ | |
4667 | ||
4668 | static enum elf_reloc_type_class | |
4669 | elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) | |
4670 | { | |
4671 | switch ((int) ELF32_R_TYPE (rela->r_info)) | |
4672 | { | |
4673 | case R_X86_64_RELATIVE: | |
4674 | case R_X86_64_RELATIVE64: | |
4675 | return reloc_class_relative; | |
4676 | case R_X86_64_JUMP_SLOT: | |
4677 | return reloc_class_plt; | |
4678 | case R_X86_64_COPY: | |
4679 | return reloc_class_copy; | |
4680 | default: | |
4681 | return reloc_class_normal; | |
4682 | } | |
4683 | } | |
4684 | ||
4685 | /* Finish up the dynamic sections. */ | |
4686 | ||
4687 | static bfd_boolean | |
4688 | elf_x86_64_finish_dynamic_sections (bfd *output_bfd, | |
4689 | struct bfd_link_info *info) | |
4690 | { | |
4691 | struct elf_x86_64_link_hash_table *htab; | |
4692 | bfd *dynobj; | |
4693 | asection *sdyn; | |
4694 | const struct elf_x86_64_backend_data *const abed | |
4695 | = get_elf_x86_64_backend_data (output_bfd); | |
4696 | ||
4697 | htab = elf_x86_64_hash_table (info); | |
4698 | if (htab == NULL) | |
4699 | return FALSE; | |
4700 | ||
4701 | dynobj = htab->elf.dynobj; | |
4702 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); | |
4703 | ||
4704 | if (htab->elf.dynamic_sections_created) | |
4705 | { | |
4706 | bfd_byte *dyncon, *dynconend; | |
4707 | const struct elf_backend_data *bed; | |
4708 | bfd_size_type sizeof_dyn; | |
4709 | ||
4710 | if (sdyn == NULL || htab->elf.sgot == NULL) | |
4711 | abort (); | |
4712 | ||
4713 | bed = get_elf_backend_data (dynobj); | |
4714 | sizeof_dyn = bed->s->sizeof_dyn; | |
4715 | dyncon = sdyn->contents; | |
4716 | dynconend = sdyn->contents + sdyn->size; | |
4717 | for (; dyncon < dynconend; dyncon += sizeof_dyn) | |
4718 | { | |
4719 | Elf_Internal_Dyn dyn; | |
4720 | asection *s; | |
4721 | ||
4722 | (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn); | |
4723 | ||
4724 | switch (dyn.d_tag) | |
4725 | { | |
4726 | default: | |
4727 | continue; | |
4728 | ||
4729 | case DT_PLTGOT: | |
4730 | s = htab->elf.sgotplt; | |
4731 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
4732 | break; | |
4733 | ||
4734 | case DT_JMPREL: | |
4735 | dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; | |
4736 | break; | |
4737 | ||
4738 | case DT_PLTRELSZ: | |
4739 | s = htab->elf.srelplt->output_section; | |
4740 | dyn.d_un.d_val = s->size; | |
4741 | break; | |
4742 | ||
4743 | case DT_RELASZ: | |
4744 | /* The procedure linkage table relocs (DT_JMPREL) should | |
4745 | not be included in the overall relocs (DT_RELA). | |
4746 | Therefore, we override the DT_RELASZ entry here to | |
4747 | make it not include the JMPREL relocs. Since the | |
4748 | linker script arranges for .rela.plt to follow all | |
4749 | other relocation sections, we don't have to worry | |
4750 | about changing the DT_RELA entry. */ | |
4751 | if (htab->elf.srelplt != NULL) | |
4752 | { | |
4753 | s = htab->elf.srelplt->output_section; | |
4754 | dyn.d_un.d_val -= s->size; | |
4755 | } | |
4756 | break; | |
4757 | ||
4758 | case DT_TLSDESC_PLT: | |
4759 | s = htab->elf.splt; | |
4760 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
4761 | + htab->tlsdesc_plt; | |
4762 | break; | |
4763 | ||
4764 | case DT_TLSDESC_GOT: | |
4765 | s = htab->elf.sgot; | |
4766 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
4767 | + htab->tlsdesc_got; | |
4768 | break; | |
4769 | } | |
4770 | ||
4771 | (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon); | |
4772 | } | |
4773 | ||
4774 | /* Fill in the special first entry in the procedure linkage table. */ | |
4775 | if (htab->elf.splt && htab->elf.splt->size > 0) | |
4776 | { | |
4777 | /* Fill in the first entry in the procedure linkage table. */ | |
4778 | memcpy (htab->elf.splt->contents, | |
4779 | abed->plt0_entry, abed->plt_entry_size); | |
4780 | /* Add offset for pushq GOT+8(%rip), since the instruction | |
4781 | uses 6 bytes subtract this value. */ | |
4782 | bfd_put_32 (output_bfd, | |
4783 | (htab->elf.sgotplt->output_section->vma | |
4784 | + htab->elf.sgotplt->output_offset | |
4785 | + 8 | |
4786 | - htab->elf.splt->output_section->vma | |
4787 | - htab->elf.splt->output_offset | |
4788 | - 6), | |
4789 | htab->elf.splt->contents + abed->plt0_got1_offset); | |
4790 | /* Add offset for the PC-relative instruction accessing GOT+16, | |
4791 | subtracting the offset to the end of that instruction. */ | |
4792 | bfd_put_32 (output_bfd, | |
4793 | (htab->elf.sgotplt->output_section->vma | |
4794 | + htab->elf.sgotplt->output_offset | |
4795 | + 16 | |
4796 | - htab->elf.splt->output_section->vma | |
4797 | - htab->elf.splt->output_offset | |
4798 | - abed->plt0_got2_insn_end), | |
4799 | htab->elf.splt->contents + abed->plt0_got2_offset); | |
4800 | ||
4801 | elf_section_data (htab->elf.splt->output_section) | |
4802 | ->this_hdr.sh_entsize = abed->plt_entry_size; | |
4803 | ||
4804 | if (htab->tlsdesc_plt) | |
4805 | { | |
4806 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
4807 | htab->elf.sgot->contents + htab->tlsdesc_got); | |
4808 | ||
4809 | memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, | |
4810 | abed->plt0_entry, abed->plt_entry_size); | |
4811 | ||
4812 | /* Add offset for pushq GOT+8(%rip), since the | |
4813 | instruction uses 6 bytes subtract this value. */ | |
4814 | bfd_put_32 (output_bfd, | |
4815 | (htab->elf.sgotplt->output_section->vma | |
4816 | + htab->elf.sgotplt->output_offset | |
4817 | + 8 | |
4818 | - htab->elf.splt->output_section->vma | |
4819 | - htab->elf.splt->output_offset | |
4820 | - htab->tlsdesc_plt | |
4821 | - 6), | |
4822 | htab->elf.splt->contents | |
4823 | + htab->tlsdesc_plt + abed->plt0_got1_offset); | |
4824 | /* Add offset for the PC-relative instruction accessing GOT+TDG, | |
4825 | where TGD stands for htab->tlsdesc_got, subtracting the offset | |
4826 | to the end of that instruction. */ | |
4827 | bfd_put_32 (output_bfd, | |
4828 | (htab->elf.sgot->output_section->vma | |
4829 | + htab->elf.sgot->output_offset | |
4830 | + htab->tlsdesc_got | |
4831 | - htab->elf.splt->output_section->vma | |
4832 | - htab->elf.splt->output_offset | |
4833 | - htab->tlsdesc_plt | |
4834 | - abed->plt0_got2_insn_end), | |
4835 | htab->elf.splt->contents | |
4836 | + htab->tlsdesc_plt + abed->plt0_got2_offset); | |
4837 | } | |
4838 | } | |
4839 | } | |
4840 | ||
4841 | if (htab->elf.sgotplt) | |
4842 | { | |
4843 | if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) | |
4844 | { | |
4845 | (*_bfd_error_handler) | |
4846 | (_("discarded output section: `%A'"), htab->elf.sgotplt); | |
4847 | return FALSE; | |
4848 | } | |
4849 | ||
4850 | /* Fill in the first three entries in the global offset table. */ | |
4851 | if (htab->elf.sgotplt->size > 0) | |
4852 | { | |
4853 | /* Set the first entry in the global offset table to the address of | |
4854 | the dynamic section. */ | |
4855 | if (sdyn == NULL) | |
4856 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents); | |
4857 | else | |
4858 | bfd_put_64 (output_bfd, | |
4859 | sdyn->output_section->vma + sdyn->output_offset, | |
4860 | htab->elf.sgotplt->contents); | |
4861 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ | |
4862 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); | |
4863 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2); | |
4864 | } | |
4865 | ||
4866 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = | |
4867 | GOT_ENTRY_SIZE; | |
4868 | } | |
4869 | ||
4870 | /* Adjust .eh_frame for .plt section. */ | |
4871 | if (htab->plt_eh_frame != NULL | |
4872 | && htab->plt_eh_frame->contents != NULL) | |
4873 | { | |
4874 | if (htab->elf.splt != NULL | |
4875 | && htab->elf.splt->size != 0 | |
4876 | && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 | |
4877 | && htab->elf.splt->output_section != NULL | |
4878 | && htab->plt_eh_frame->output_section != NULL) | |
4879 | { | |
4880 | bfd_vma plt_start = htab->elf.splt->output_section->vma; | |
4881 | bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma | |
4882 | + htab->plt_eh_frame->output_offset | |
4883 | + PLT_FDE_START_OFFSET; | |
4884 | bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, | |
4885 | htab->plt_eh_frame->contents | |
4886 | + PLT_FDE_START_OFFSET); | |
4887 | } | |
4888 | if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME) | |
4889 | { | |
4890 | if (! _bfd_elf_write_section_eh_frame (output_bfd, info, | |
4891 | htab->plt_eh_frame, | |
4892 | htab->plt_eh_frame->contents)) | |
4893 | return FALSE; | |
4894 | } | |
4895 | } | |
4896 | ||
4897 | if (htab->elf.sgot && htab->elf.sgot->size > 0) | |
4898 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize | |
4899 | = GOT_ENTRY_SIZE; | |
4900 | ||
4901 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ | |
4902 | htab_traverse (htab->loc_hash_table, | |
4903 | elf_x86_64_finish_local_dynamic_symbol, | |
4904 | info); | |
4905 | ||
4906 | return TRUE; | |
4907 | } | |
4908 | ||
4909 | /* Return address for Ith PLT stub in section PLT, for relocation REL | |
4910 | or (bfd_vma) -1 if it should not be included. */ | |
4911 | ||
4912 | static bfd_vma | |
4913 | elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt, | |
4914 | const arelent *rel ATTRIBUTE_UNUSED) | |
4915 | { | |
4916 | return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner); | |
4917 | } | |
4918 | ||
4919 | /* Handle an x86-64 specific section when reading an object file. This | |
4920 | is called when elfcode.h finds a section with an unknown type. */ | |
4921 | ||
4922 | static bfd_boolean | |
4923 | elf_x86_64_section_from_shdr (bfd *abfd, | |
4924 | Elf_Internal_Shdr *hdr, | |
4925 | const char *name, | |
4926 | int shindex) | |
4927 | { | |
4928 | if (hdr->sh_type != SHT_X86_64_UNWIND) | |
4929 | return FALSE; | |
4930 | ||
4931 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) | |
4932 | return FALSE; | |
4933 | ||
4934 | return TRUE; | |
4935 | } | |
4936 | ||
4937 | /* Hook called by the linker routine which adds symbols from an object | |
4938 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead | |
4939 | of .bss. */ | |
4940 | ||
4941 | static bfd_boolean | |
4942 | elf_x86_64_add_symbol_hook (bfd *abfd, | |
4943 | struct bfd_link_info *info, | |
4944 | Elf_Internal_Sym *sym, | |
4945 | const char **namep ATTRIBUTE_UNUSED, | |
4946 | flagword *flagsp ATTRIBUTE_UNUSED, | |
4947 | asection **secp, | |
4948 | bfd_vma *valp) | |
4949 | { | |
4950 | asection *lcomm; | |
4951 | ||
4952 | switch (sym->st_shndx) | |
4953 | { | |
4954 | case SHN_X86_64_LCOMMON: | |
4955 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); | |
4956 | if (lcomm == NULL) | |
4957 | { | |
4958 | lcomm = bfd_make_section_with_flags (abfd, | |
4959 | "LARGE_COMMON", | |
4960 | (SEC_ALLOC | |
4961 | | SEC_IS_COMMON | |
4962 | | SEC_LINKER_CREATED)); | |
4963 | if (lcomm == NULL) | |
4964 | return FALSE; | |
4965 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; | |
4966 | } | |
4967 | *secp = lcomm; | |
4968 | *valp = sym->st_size; | |
4969 | return TRUE; | |
4970 | } | |
4971 | ||
4972 | if ((abfd->flags & DYNAMIC) == 0 | |
4973 | && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC | |
4974 | || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)) | |
4975 | elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; | |
4976 | ||
4977 | return TRUE; | |
4978 | } | |
4979 | ||
4980 | ||
4981 | /* Given a BFD section, try to locate the corresponding ELF section | |
4982 | index. */ | |
4983 | ||
4984 | static bfd_boolean | |
4985 | elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, | |
4986 | asection *sec, int *index_return) | |
4987 | { | |
4988 | if (sec == &_bfd_elf_large_com_section) | |
4989 | { | |
4990 | *index_return = SHN_X86_64_LCOMMON; | |
4991 | return TRUE; | |
4992 | } | |
4993 | return FALSE; | |
4994 | } | |
4995 | ||
4996 | /* Process a symbol. */ | |
4997 | ||
4998 | static void | |
4999 | elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, | |
5000 | asymbol *asym) | |
5001 | { | |
5002 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; | |
5003 | ||
5004 | switch (elfsym->internal_elf_sym.st_shndx) | |
5005 | { | |
5006 | case SHN_X86_64_LCOMMON: | |
5007 | asym->section = &_bfd_elf_large_com_section; | |
5008 | asym->value = elfsym->internal_elf_sym.st_size; | |
5009 | /* Common symbol doesn't set BSF_GLOBAL. */ | |
5010 | asym->flags &= ~BSF_GLOBAL; | |
5011 | break; | |
5012 | } | |
5013 | } | |
5014 | ||
5015 | static bfd_boolean | |
5016 | elf_x86_64_common_definition (Elf_Internal_Sym *sym) | |
5017 | { | |
5018 | return (sym->st_shndx == SHN_COMMON | |
5019 | || sym->st_shndx == SHN_X86_64_LCOMMON); | |
5020 | } | |
5021 | ||
5022 | static unsigned int | |
5023 | elf_x86_64_common_section_index (asection *sec) | |
5024 | { | |
5025 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) | |
5026 | return SHN_COMMON; | |
5027 | else | |
5028 | return SHN_X86_64_LCOMMON; | |
5029 | } | |
5030 | ||
5031 | static asection * | |
5032 | elf_x86_64_common_section (asection *sec) | |
5033 | { | |
5034 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) | |
5035 | return bfd_com_section_ptr; | |
5036 | else | |
5037 | return &_bfd_elf_large_com_section; | |
5038 | } | |
5039 | ||
5040 | static bfd_boolean | |
5041 | elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
5042 | struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, | |
5043 | struct elf_link_hash_entry *h, | |
5044 | Elf_Internal_Sym *sym, | |
5045 | asection **psec, | |
5046 | bfd_vma *pvalue ATTRIBUTE_UNUSED, | |
5047 | unsigned int *pold_alignment ATTRIBUTE_UNUSED, | |
5048 | bfd_boolean *skip ATTRIBUTE_UNUSED, | |
5049 | bfd_boolean *override ATTRIBUTE_UNUSED, | |
5050 | bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, | |
5051 | bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, | |
5052 | bfd_boolean *newdyn ATTRIBUTE_UNUSED, | |
5053 | bfd_boolean *newdef, | |
5054 | bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, | |
5055 | bfd_boolean *newweak ATTRIBUTE_UNUSED, | |
5056 | bfd *abfd ATTRIBUTE_UNUSED, | |
5057 | asection **sec, | |
5058 | bfd_boolean *olddyn ATTRIBUTE_UNUSED, | |
5059 | bfd_boolean *olddef, | |
5060 | bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, | |
5061 | bfd_boolean *oldweak ATTRIBUTE_UNUSED, | |
5062 | bfd *oldbfd, | |
5063 | asection **oldsec) | |
5064 | { | |
5065 | /* A normal common symbol and a large common symbol result in a | |
5066 | normal common symbol. We turn the large common symbol into a | |
5067 | normal one. */ | |
5068 | if (!*olddef | |
5069 | && h->root.type == bfd_link_hash_common | |
5070 | && !*newdef | |
5071 | && bfd_is_com_section (*sec) | |
5072 | && *oldsec != *sec) | |
5073 | { | |
5074 | if (sym->st_shndx == SHN_COMMON | |
5075 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) | |
5076 | { | |
5077 | h->root.u.c.p->section | |
5078 | = bfd_make_section_old_way (oldbfd, "COMMON"); | |
5079 | h->root.u.c.p->section->flags = SEC_ALLOC; | |
5080 | } | |
5081 | else if (sym->st_shndx == SHN_X86_64_LCOMMON | |
5082 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) | |
5083 | *psec = *sec = bfd_com_section_ptr; | |
5084 | } | |
5085 | ||
5086 | return TRUE; | |
5087 | } | |
5088 | ||
5089 | static int | |
5090 | elf_x86_64_additional_program_headers (bfd *abfd, | |
5091 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
5092 | { | |
5093 | asection *s; | |
5094 | int count = 0; | |
5095 | ||
5096 | /* Check to see if we need a large readonly segment. */ | |
5097 | s = bfd_get_section_by_name (abfd, ".lrodata"); | |
5098 | if (s && (s->flags & SEC_LOAD)) | |
5099 | count++; | |
5100 | ||
5101 | /* Check to see if we need a large data segment. Since .lbss sections | |
5102 | is placed right after the .bss section, there should be no need for | |
5103 | a large data segment just because of .lbss. */ | |
5104 | s = bfd_get_section_by_name (abfd, ".ldata"); | |
5105 | if (s && (s->flags & SEC_LOAD)) | |
5106 | count++; | |
5107 | ||
5108 | return count; | |
5109 | } | |
5110 | ||
5111 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ | |
5112 | ||
5113 | static bfd_boolean | |
5114 | elf_x86_64_hash_symbol (struct elf_link_hash_entry *h) | |
5115 | { | |
5116 | if (h->plt.offset != (bfd_vma) -1 | |
5117 | && !h->def_regular | |
5118 | && !h->pointer_equality_needed) | |
5119 | return FALSE; | |
5120 | ||
5121 | return _bfd_elf_hash_symbol (h); | |
5122 | } | |
5123 | ||
5124 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ | |
5125 | ||
5126 | static bfd_boolean | |
5127 | elf_x86_64_relocs_compatible (const bfd_target *input, | |
5128 | const bfd_target *output) | |
5129 | { | |
5130 | return ((xvec_get_elf_backend_data (input)->s->elfclass | |
5131 | == xvec_get_elf_backend_data (output)->s->elfclass) | |
5132 | && _bfd_elf_relocs_compatible (input, output)); | |
5133 | } | |
5134 | ||
5135 | static const struct bfd_elf_special_section | |
5136 | elf_x86_64_special_sections[]= | |
5137 | { | |
5138 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
5139 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, | |
5140 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, | |
5141 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
5142 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, | |
5143 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, | |
5144 | { NULL, 0, 0, 0, 0 } | |
5145 | }; | |
5146 | ||
5147 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec | |
5148 | #define TARGET_LITTLE_NAME "elf64-x86-64" | |
5149 | #define ELF_ARCH bfd_arch_i386 | |
5150 | #define ELF_TARGET_ID X86_64_ELF_DATA | |
5151 | #define ELF_MACHINE_CODE EM_X86_64 | |
5152 | #define ELF_MAXPAGESIZE 0x200000 | |
5153 | #define ELF_MINPAGESIZE 0x1000 | |
5154 | #define ELF_COMMONPAGESIZE 0x1000 | |
5155 | ||
5156 | #define elf_backend_can_gc_sections 1 | |
5157 | #define elf_backend_can_refcount 1 | |
5158 | #define elf_backend_want_got_plt 1 | |
5159 | #define elf_backend_plt_readonly 1 | |
5160 | #define elf_backend_want_plt_sym 0 | |
5161 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) | |
5162 | #define elf_backend_rela_normal 1 | |
5163 | #define elf_backend_plt_alignment 4 | |
5164 | ||
5165 | #define elf_info_to_howto elf_x86_64_info_to_howto | |
5166 | ||
5167 | #define bfd_elf64_bfd_link_hash_table_create \ | |
5168 | elf_x86_64_link_hash_table_create | |
5169 | #define bfd_elf64_bfd_link_hash_table_free \ | |
5170 | elf_x86_64_link_hash_table_free | |
5171 | #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup | |
5172 | #define bfd_elf64_bfd_reloc_name_lookup \ | |
5173 | elf_x86_64_reloc_name_lookup | |
5174 | ||
5175 | #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol | |
5176 | #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible | |
5177 | #define elf_backend_check_relocs elf_x86_64_check_relocs | |
5178 | #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol | |
5179 | #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections | |
5180 | #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections | |
5181 | #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol | |
5182 | #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook | |
5183 | #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook | |
5184 | #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus | |
5185 | #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo | |
5186 | #ifdef CORE_HEADER | |
5187 | #define elf_backend_write_core_note elf_x86_64_write_core_note | |
5188 | #endif | |
5189 | #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class | |
5190 | #define elf_backend_relocate_section elf_x86_64_relocate_section | |
5191 | #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections | |
5192 | #define elf_backend_always_size_sections elf_x86_64_always_size_sections | |
5193 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section | |
5194 | #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val | |
5195 | #define elf_backend_object_p elf64_x86_64_elf_object_p | |
5196 | #define bfd_elf64_mkobject elf_x86_64_mkobject | |
5197 | ||
5198 | #define elf_backend_section_from_shdr \ | |
5199 | elf_x86_64_section_from_shdr | |
5200 | ||
5201 | #define elf_backend_section_from_bfd_section \ | |
5202 | elf_x86_64_elf_section_from_bfd_section | |
5203 | #define elf_backend_add_symbol_hook \ | |
5204 | elf_x86_64_add_symbol_hook | |
5205 | #define elf_backend_symbol_processing \ | |
5206 | elf_x86_64_symbol_processing | |
5207 | #define elf_backend_common_section_index \ | |
5208 | elf_x86_64_common_section_index | |
5209 | #define elf_backend_common_section \ | |
5210 | elf_x86_64_common_section | |
5211 | #define elf_backend_common_definition \ | |
5212 | elf_x86_64_common_definition | |
5213 | #define elf_backend_merge_symbol \ | |
5214 | elf_x86_64_merge_symbol | |
5215 | #define elf_backend_special_sections \ | |
5216 | elf_x86_64_special_sections | |
5217 | #define elf_backend_additional_program_headers \ | |
5218 | elf_x86_64_additional_program_headers | |
5219 | #define elf_backend_hash_symbol \ | |
5220 | elf_x86_64_hash_symbol | |
5221 | ||
5222 | #define elf_backend_post_process_headers _bfd_elf_set_osabi | |
5223 | ||
5224 | #include "elf64-target.h" | |
5225 | ||
5226 | /* FreeBSD support. */ | |
5227 | ||
5228 | #undef TARGET_LITTLE_SYM | |
5229 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec | |
5230 | #undef TARGET_LITTLE_NAME | |
5231 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" | |
5232 | ||
5233 | #undef ELF_OSABI | |
5234 | #define ELF_OSABI ELFOSABI_FREEBSD | |
5235 | ||
5236 | #undef elf64_bed | |
5237 | #define elf64_bed elf64_x86_64_fbsd_bed | |
5238 | ||
5239 | #include "elf64-target.h" | |
5240 | ||
5241 | /* Solaris 2 support. */ | |
5242 | ||
5243 | #undef TARGET_LITTLE_SYM | |
5244 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec | |
5245 | #undef TARGET_LITTLE_NAME | |
5246 | #define TARGET_LITTLE_NAME "elf64-x86-64-sol2" | |
5247 | ||
5248 | /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE | |
5249 | objects won't be recognized. */ | |
5250 | #undef ELF_OSABI | |
5251 | ||
5252 | #undef elf64_bed | |
5253 | #define elf64_bed elf64_x86_64_sol2_bed | |
5254 | ||
5255 | /* The 64-bit static TLS arena size is rounded to the nearest 16-byte | |
5256 | boundary. */ | |
5257 | #undef elf_backend_static_tls_alignment | |
5258 | #define elf_backend_static_tls_alignment 16 | |
5259 | ||
5260 | /* The Solaris 2 ABI requires a plt symbol on all platforms. | |
5261 | ||
5262 | Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output | |
5263 | File, p.63. */ | |
5264 | #undef elf_backend_want_plt_sym | |
5265 | #define elf_backend_want_plt_sym 1 | |
5266 | ||
5267 | #include "elf64-target.h" | |
5268 | ||
5269 | /* Native Client support. */ | |
5270 | ||
5271 | #undef TARGET_LITTLE_SYM | |
5272 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec | |
5273 | #undef TARGET_LITTLE_NAME | |
5274 | #define TARGET_LITTLE_NAME "elf64-x86-64-nacl" | |
5275 | #undef elf64_bed | |
5276 | #define elf64_bed elf64_x86_64_nacl_bed | |
5277 | ||
5278 | #undef ELF_MAXPAGESIZE | |
5279 | #undef ELF_MINPAGESIZE | |
5280 | #undef ELF_COMMONPAGESIZE | |
5281 | #define ELF_MAXPAGESIZE 0x10000 | |
5282 | #define ELF_MINPAGESIZE 0x10000 | |
5283 | #define ELF_COMMONPAGESIZE 0x10000 | |
5284 | ||
5285 | /* Restore defaults. */ | |
5286 | #undef ELF_OSABI | |
5287 | #undef elf_backend_static_tls_alignment | |
5288 | #undef elf_backend_want_plt_sym | |
5289 | #define elf_backend_want_plt_sym 0 | |
5290 | ||
5291 | /* NaCl uses substantially different PLT entries for the same effects. */ | |
5292 | ||
5293 | #undef elf_backend_plt_alignment | |
5294 | #define elf_backend_plt_alignment 5 | |
5295 | #define NACL_PLT_ENTRY_SIZE 64 | |
5296 | #define NACLMASK 0xe0 /* 32-byte alignment mask. */ | |
5297 | ||
5298 | static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] = | |
5299 | { | |
5300 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ | |
5301 | 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */ | |
5302 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ | |
5303 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ | |
5304 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ | |
5305 | ||
5306 | /* 9-byte nop sequence to pad out to the next 32-byte boundary. */ | |
5307 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */ | |
5308 | ||
5309 | /* 32 bytes of nop to pad out to the standard size. */ | |
5310 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ | |
5311 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ | |
5312 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ | |
5313 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ | |
5314 | 0x66, /* excess data32 prefix */ | |
5315 | 0x90 /* nop */ | |
5316 | }; | |
5317 | ||
5318 | static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = | |
5319 | { | |
5320 | 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */ | |
5321 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ | |
5322 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ | |
5323 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ | |
5324 | ||
5325 | /* 15-byte nop sequence to pad out to the next 32-byte boundary. */ | |
5326 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ | |
5327 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ | |
5328 | ||
5329 | /* Lazy GOT entries point here (32-byte aligned). */ | |
5330 | 0x68, /* pushq immediate */ | |
5331 | 0, 0, 0, 0, /* replaced with index into relocation table. */ | |
5332 | 0xe9, /* jmp relative */ | |
5333 | 0, 0, 0, 0, /* replaced with offset to start of .plt0. */ | |
5334 | ||
5335 | /* 22 bytes of nop to pad out to the standard size. */ | |
5336 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ | |
5337 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ | |
5338 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */ | |
5339 | }; | |
5340 | ||
5341 | /* .eh_frame covering the .plt section. */ | |
5342 | ||
5343 | static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] = | |
5344 | { | |
5345 | #if (PLT_CIE_LENGTH != 20 \ | |
5346 | || PLT_FDE_LENGTH != 36 \ | |
5347 | || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ | |
5348 | || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) | |
5349 | # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!" | |
5350 | #endif | |
5351 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ | |
5352 | 0, 0, 0, 0, /* CIE ID */ | |
5353 | 1, /* CIE version */ | |
5354 | 'z', 'R', 0, /* Augmentation string */ | |
5355 | 1, /* Code alignment factor */ | |
5356 | 0x78, /* Data alignment factor */ | |
5357 | 16, /* Return address column */ | |
5358 | 1, /* Augmentation size */ | |
5359 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ | |
5360 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ | |
5361 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ | |
5362 | DW_CFA_nop, DW_CFA_nop, | |
5363 | ||
5364 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ | |
5365 | PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */ | |
5366 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ | |
5367 | 0, 0, 0, 0, /* .plt size goes here */ | |
5368 | 0, /* Augmentation size */ | |
5369 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ | |
5370 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ | |
5371 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ | |
5372 | DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ | |
5373 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ | |
5374 | 13, /* Block length */ | |
5375 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ | |
5376 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ | |
5377 | DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, | |
5378 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, | |
5379 | DW_CFA_nop, DW_CFA_nop | |
5380 | }; | |
5381 | ||
5382 | static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed = | |
5383 | { | |
5384 | elf_x86_64_nacl_plt0_entry, /* plt0_entry */ | |
5385 | elf_x86_64_nacl_plt_entry, /* plt_entry */ | |
5386 | NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ | |
5387 | 2, /* plt0_got1_offset */ | |
5388 | 9, /* plt0_got2_offset */ | |
5389 | 13, /* plt0_got2_insn_end */ | |
5390 | 3, /* plt_got_offset */ | |
5391 | 33, /* plt_reloc_offset */ | |
5392 | 38, /* plt_plt_offset */ | |
5393 | 7, /* plt_got_insn_size */ | |
5394 | 42, /* plt_plt_insn_end */ | |
5395 | 32, /* plt_lazy_offset */ | |
5396 | elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */ | |
5397 | sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */ | |
5398 | }; | |
5399 | ||
5400 | #undef elf_backend_arch_data | |
5401 | #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed | |
5402 | ||
5403 | #undef elf_backend_modify_segment_map | |
5404 | #define elf_backend_modify_segment_map nacl_modify_segment_map | |
5405 | #undef elf_backend_modify_program_headers | |
5406 | #define elf_backend_modify_program_headers nacl_modify_program_headers | |
5407 | ||
5408 | #include "elf64-target.h" | |
5409 | ||
5410 | /* Native Client x32 support. */ | |
5411 | ||
5412 | #undef TARGET_LITTLE_SYM | |
5413 | #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec | |
5414 | #undef TARGET_LITTLE_NAME | |
5415 | #define TARGET_LITTLE_NAME "elf32-x86-64-nacl" | |
5416 | #undef elf32_bed | |
5417 | #define elf32_bed elf32_x86_64_nacl_bed | |
5418 | ||
5419 | #define bfd_elf32_bfd_link_hash_table_create \ | |
5420 | elf_x86_64_link_hash_table_create | |
5421 | #define bfd_elf32_bfd_link_hash_table_free \ | |
5422 | elf_x86_64_link_hash_table_free | |
5423 | #define bfd_elf32_bfd_reloc_type_lookup \ | |
5424 | elf_x86_64_reloc_type_lookup | |
5425 | #define bfd_elf32_bfd_reloc_name_lookup \ | |
5426 | elf_x86_64_reloc_name_lookup | |
5427 | #define bfd_elf32_mkobject \ | |
5428 | elf_x86_64_mkobject | |
5429 | ||
5430 | #undef elf_backend_object_p | |
5431 | #define elf_backend_object_p \ | |
5432 | elf32_x86_64_elf_object_p | |
5433 | ||
5434 | #undef elf_backend_bfd_from_remote_memory | |
5435 | #define elf_backend_bfd_from_remote_memory \ | |
5436 | _bfd_elf32_bfd_from_remote_memory | |
5437 | ||
5438 | #undef elf_backend_size_info | |
5439 | #define elf_backend_size_info \ | |
5440 | _bfd_elf32_size_info | |
5441 | ||
5442 | #include "elf32-target.h" | |
5443 | ||
5444 | /* Restore defaults. */ | |
5445 | #undef elf_backend_object_p | |
5446 | #define elf_backend_object_p elf64_x86_64_elf_object_p | |
5447 | #undef elf_backend_bfd_from_remote_memory | |
5448 | #undef elf_backend_size_info | |
5449 | #undef elf_backend_modify_segment_map | |
5450 | #undef elf_backend_modify_program_headers | |
5451 | ||
5452 | /* Intel L1OM support. */ | |
5453 | ||
5454 | static bfd_boolean | |
5455 | elf64_l1om_elf_object_p (bfd *abfd) | |
5456 | { | |
5457 | /* Set the right machine number for an L1OM elf64 file. */ | |
5458 | bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om); | |
5459 | return TRUE; | |
5460 | } | |
5461 | ||
5462 | #undef TARGET_LITTLE_SYM | |
5463 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec | |
5464 | #undef TARGET_LITTLE_NAME | |
5465 | #define TARGET_LITTLE_NAME "elf64-l1om" | |
5466 | #undef ELF_ARCH | |
5467 | #define ELF_ARCH bfd_arch_l1om | |
5468 | ||
5469 | #undef ELF_MACHINE_CODE | |
5470 | #define ELF_MACHINE_CODE EM_L1OM | |
5471 | ||
5472 | #undef ELF_OSABI | |
5473 | ||
5474 | #undef elf64_bed | |
5475 | #define elf64_bed elf64_l1om_bed | |
5476 | ||
5477 | #undef elf_backend_object_p | |
5478 | #define elf_backend_object_p elf64_l1om_elf_object_p | |
5479 | ||
5480 | /* Restore defaults. */ | |
5481 | #undef ELF_MAXPAGESIZE | |
5482 | #undef ELF_MINPAGESIZE | |
5483 | #undef ELF_COMMONPAGESIZE | |
5484 | #define ELF_MAXPAGESIZE 0x200000 | |
5485 | #define ELF_MINPAGESIZE 0x1000 | |
5486 | #define ELF_COMMONPAGESIZE 0x1000 | |
5487 | #undef elf_backend_plt_alignment | |
5488 | #define elf_backend_plt_alignment 4 | |
5489 | #undef elf_backend_arch_data | |
5490 | #define elf_backend_arch_data &elf_x86_64_arch_bed | |
5491 | ||
5492 | #include "elf64-target.h" | |
5493 | ||
5494 | /* FreeBSD L1OM support. */ | |
5495 | ||
5496 | #undef TARGET_LITTLE_SYM | |
5497 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec | |
5498 | #undef TARGET_LITTLE_NAME | |
5499 | #define TARGET_LITTLE_NAME "elf64-l1om-freebsd" | |
5500 | ||
5501 | #undef ELF_OSABI | |
5502 | #define ELF_OSABI ELFOSABI_FREEBSD | |
5503 | ||
5504 | #undef elf64_bed | |
5505 | #define elf64_bed elf64_l1om_fbsd_bed | |
5506 | ||
5507 | #include "elf64-target.h" | |
5508 | ||
5509 | /* Intel K1OM support. */ | |
5510 | ||
5511 | static bfd_boolean | |
5512 | elf64_k1om_elf_object_p (bfd *abfd) | |
5513 | { | |
5514 | /* Set the right machine number for an K1OM elf64 file. */ | |
5515 | bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om); | |
5516 | return TRUE; | |
5517 | } | |
5518 | ||
5519 | #undef TARGET_LITTLE_SYM | |
5520 | #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec | |
5521 | #undef TARGET_LITTLE_NAME | |
5522 | #define TARGET_LITTLE_NAME "elf64-k1om" | |
5523 | #undef ELF_ARCH | |
5524 | #define ELF_ARCH bfd_arch_k1om | |
5525 | ||
5526 | #undef ELF_MACHINE_CODE | |
5527 | #define ELF_MACHINE_CODE EM_K1OM | |
5528 | ||
5529 | #undef ELF_OSABI | |
5530 | ||
5531 | #undef elf64_bed | |
5532 | #define elf64_bed elf64_k1om_bed | |
5533 | ||
5534 | #undef elf_backend_object_p | |
5535 | #define elf_backend_object_p elf64_k1om_elf_object_p | |
5536 | ||
5537 | #undef elf_backend_static_tls_alignment | |
5538 | ||
5539 | #undef elf_backend_want_plt_sym | |
5540 | #define elf_backend_want_plt_sym 0 | |
5541 | ||
5542 | #include "elf64-target.h" | |
5543 | ||
5544 | /* FreeBSD K1OM support. */ | |
5545 | ||
5546 | #undef TARGET_LITTLE_SYM | |
5547 | #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec | |
5548 | #undef TARGET_LITTLE_NAME | |
5549 | #define TARGET_LITTLE_NAME "elf64-k1om-freebsd" | |
5550 | ||
5551 | #undef ELF_OSABI | |
5552 | #define ELF_OSABI ELFOSABI_FREEBSD | |
5553 | ||
5554 | #undef elf64_bed | |
5555 | #define elf64_bed elf64_k1om_fbsd_bed | |
5556 | ||
5557 | #include "elf64-target.h" | |
5558 | ||
5559 | /* 32bit x86-64 support. */ | |
5560 | ||
5561 | #undef TARGET_LITTLE_SYM | |
5562 | #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec | |
5563 | #undef TARGET_LITTLE_NAME | |
5564 | #define TARGET_LITTLE_NAME "elf32-x86-64" | |
5565 | #undef elf32_bed | |
5566 | ||
5567 | #undef ELF_ARCH | |
5568 | #define ELF_ARCH bfd_arch_i386 | |
5569 | ||
5570 | #undef ELF_MACHINE_CODE | |
5571 | #define ELF_MACHINE_CODE EM_X86_64 | |
5572 | ||
5573 | #undef ELF_OSABI | |
5574 | ||
5575 | #undef elf_backend_object_p | |
5576 | #define elf_backend_object_p \ | |
5577 | elf32_x86_64_elf_object_p | |
5578 | ||
5579 | #undef elf_backend_bfd_from_remote_memory | |
5580 | #define elf_backend_bfd_from_remote_memory \ | |
5581 | _bfd_elf32_bfd_from_remote_memory | |
5582 | ||
5583 | #undef elf_backend_size_info | |
5584 | #define elf_backend_size_info \ | |
5585 | _bfd_elf32_size_info | |
5586 | ||
5587 | #include "elf32-target.h" |