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06c15ad7 | 1 | /* CRIS-specific support for 32-bit ELF. |
915e5146 | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
06c15ad7 HPN |
3 | Contributed by Axis Communications AB. |
4 | Written by Hans-Peter Nilsson, based on elf32-fr30.c | |
915e5146 | 5 | PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c. |
06c15ad7 HPN |
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "bfd.h" | |
24 | #include "sysdep.h" | |
25 | #include "libbfd.h" | |
26 | #include "elf-bfd.h" | |
27 | #include "elf/cris.h" | |
28 | ||
29 | /* Forward declarations. */ | |
30 | static reloc_howto_type * cris_reloc_type_lookup | |
31 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); | |
32 | ||
a7c10850 | 33 | static void cris_info_to_howto_rela |
06c15ad7 HPN |
34 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
35 | ||
a7c10850 | 36 | static boolean cris_elf_relocate_section |
06c15ad7 HPN |
37 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
38 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
39 | ||
40 | static bfd_reloc_status_type cris_final_link_relocate | |
41 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, | |
42 | Elf_Internal_Rela *, bfd_vma)); | |
43 | ||
44 | static boolean cris_elf_gc_sweep_hook | |
45 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
46 | const Elf_Internal_Rela *)); | |
47 | ||
48 | static asection * cris_elf_gc_mark_hook | |
49 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
50 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
51 | ||
4da81684 HPN |
52 | static boolean cris_elf_object_p PARAMS ((bfd *)); |
53 | ||
54 | static void cris_elf_final_write_processing PARAMS ((bfd *, boolean)); | |
55 | ||
56 | static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); | |
57 | ||
58 | static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); | |
59 | ||
915e5146 HPN |
60 | struct elf_cris_link_hash_entry; |
61 | static boolean elf_cris_discard_copies | |
62 | PARAMS ((struct elf_cris_link_hash_entry *, PTR)); | |
63 | static boolean elf_cris_adjust_gotplt_to_got | |
64 | PARAMS ((struct elf_cris_link_hash_entry *, PTR)); | |
65 | static boolean elf_cris_try_fold_plt_to_got | |
66 | PARAMS ((struct elf_cris_link_hash_entry *, PTR)); | |
67 | static struct bfd_hash_entry *elf_cris_link_hash_newfunc | |
68 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
69 | static struct bfd_link_hash_table *elf_cris_link_hash_table_create | |
70 | PARAMS ((bfd *)); | |
71 | static boolean elf_cris_adjust_dynamic_symbol | |
72 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
73 | static boolean elf_cris_size_dynamic_sections | |
74 | PARAMS ((bfd *, struct bfd_link_info *)); | |
75 | static boolean elf_cris_finish_dynamic_symbol | |
76 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
77 | Elf_Internal_Sym *)); | |
78 | static boolean elf_cris_finish_dynamic_sections | |
79 | PARAMS ((bfd *, struct bfd_link_info *)); | |
80 | static void elf_cris_hide_symbol | |
81 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
82 | ||
06c15ad7 HPN |
83 | static reloc_howto_type cris_elf_howto_table [] = |
84 | { | |
85 | /* This reloc does nothing. */ | |
86 | HOWTO (R_CRIS_NONE, /* type */ | |
87 | 0, /* rightshift */ | |
88 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
89 | 32, /* bitsize */ | |
90 | false, /* pc_relative */ | |
91 | 0, /* bitpos */ | |
92 | complain_overflow_bitfield, /* complain_on_overflow */ | |
93 | bfd_elf_generic_reloc, /* special_function */ | |
94 | "R_CRIS_NONE", /* name */ | |
95 | false, /* partial_inplace */ | |
96 | 0, /* src_mask */ | |
97 | 0, /* dst_mask */ | |
98 | false), /* pcrel_offset */ | |
99 | ||
100 | /* An 8 bit absolute relocation. */ | |
101 | HOWTO (R_CRIS_8, /* type */ | |
102 | 0, /* rightshift */ | |
103 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
104 | 8, /* bitsize */ | |
105 | false, /* pc_relative */ | |
106 | 0, /* bitpos */ | |
107 | complain_overflow_bitfield, /* complain_on_overflow */ | |
108 | bfd_elf_generic_reloc, /* special_function */ | |
109 | "R_CRIS_8", /* name */ | |
110 | false, /* partial_inplace */ | |
111 | 0x0000, /* src_mask */ | |
112 | 0x00ff, /* dst_mask */ | |
113 | false), /* pcrel_offset */ | |
114 | ||
115 | /* A 16 bit absolute relocation. */ | |
116 | HOWTO (R_CRIS_16, /* type */ | |
117 | 0, /* rightshift */ | |
118 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
119 | 16, /* bitsize */ | |
120 | false, /* pc_relative */ | |
121 | 0, /* bitpos */ | |
122 | complain_overflow_bitfield, /* complain_on_overflow */ | |
123 | bfd_elf_generic_reloc, /* special_function */ | |
124 | "R_CRIS_16", /* name */ | |
125 | false, /* partial_inplace */ | |
126 | 0x00000000, /* src_mask */ | |
127 | 0x0000ffff, /* dst_mask */ | |
128 | false), /* pcrel_offset */ | |
129 | ||
130 | /* A 32 bit absolute relocation. */ | |
131 | HOWTO (R_CRIS_32, /* type */ | |
132 | 0, /* rightshift */ | |
133 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
134 | 32, /* bitsize */ | |
135 | false, /* pc_relative */ | |
136 | 0, /* bitpos */ | |
137 | complain_overflow_bitfield, /* complain_on_overflow */ | |
138 | bfd_elf_generic_reloc, /* special_function */ | |
139 | "R_CRIS_32", /* name */ | |
140 | false, /* partial_inplace */ | |
141 | 0x00000000, /* src_mask */ | |
142 | 0xffffffff, /* dst_mask */ | |
143 | false), /* pcrel_offset */ | |
144 | ||
915e5146 | 145 | /* An 8 bit PC-relative relocation. */ |
06c15ad7 HPN |
146 | HOWTO (R_CRIS_8_PCREL, /* type */ |
147 | 0, /* rightshift */ | |
148 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
149 | 8, /* bitsize */ | |
150 | true, /* pc_relative */ | |
151 | 0, /* bitpos */ | |
152 | complain_overflow_bitfield, /* complain_on_overflow */ | |
153 | bfd_elf_generic_reloc, /* special_function */ | |
154 | "R_CRIS_8_PCREL", /* name */ | |
155 | false, /* partial_inplace */ | |
156 | 0x0000, /* src_mask */ | |
157 | 0x00ff, /* dst_mask */ | |
915e5146 | 158 | true), /* pcrel_offset */ |
06c15ad7 | 159 | |
915e5146 | 160 | /* A 16 bit PC-relative relocation. */ |
06c15ad7 HPN |
161 | HOWTO (R_CRIS_16_PCREL, /* type */ |
162 | 0, /* rightshift */ | |
163 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
164 | 16, /* bitsize */ | |
165 | true, /* pc_relative */ | |
166 | 0, /* bitpos */ | |
167 | complain_overflow_bitfield, /* complain_on_overflow */ | |
168 | bfd_elf_generic_reloc, /* special_function */ | |
169 | "R_CRIS_16", /* name */ | |
170 | false, /* partial_inplace */ | |
171 | 0x00000000, /* src_mask */ | |
172 | 0x0000ffff, /* dst_mask */ | |
915e5146 | 173 | true), /* pcrel_offset */ |
06c15ad7 | 174 | |
915e5146 | 175 | /* A 32 bit PC-relative relocation. */ |
06c15ad7 HPN |
176 | HOWTO (R_CRIS_32_PCREL, /* type */ |
177 | 0, /* rightshift */ | |
178 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
179 | 32, /* bitsize */ | |
180 | true, /* pc_relative */ | |
181 | 0, /* bitpos */ | |
182 | complain_overflow_bitfield, /* complain_on_overflow */ | |
183 | bfd_elf_generic_reloc, /* special_function */ | |
184 | "R_CRIS_32", /* name */ | |
185 | false, /* partial_inplace */ | |
186 | 0x00000000, /* src_mask */ | |
187 | 0xffffffff, /* dst_mask */ | |
915e5146 | 188 | true), /* pcrel_offset */ |
06c15ad7 | 189 | |
915e5146 HPN |
190 | /* GNU extension to record C++ vtable hierarchy. */ |
191 | HOWTO (R_CRIS_GNU_VTINHERIT, /* type */ | |
06c15ad7 HPN |
192 | 0, /* rightshift */ |
193 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
194 | 0, /* bitsize */ | |
195 | false, /* pc_relative */ | |
196 | 0, /* bitpos */ | |
197 | complain_overflow_dont, /* complain_on_overflow */ | |
198 | NULL, /* special_function */ | |
199 | "R_CRIS_GNU_VTINHERIT", /* name */ | |
200 | false, /* partial_inplace */ | |
201 | 0, /* src_mask */ | |
202 | 0, /* dst_mask */ | |
203 | false), /* pcrel_offset */ | |
204 | ||
915e5146 HPN |
205 | /* GNU extension to record C++ vtable member usage. */ |
206 | HOWTO (R_CRIS_GNU_VTENTRY, /* type */ | |
06c15ad7 HPN |
207 | 0, /* rightshift */ |
208 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
209 | 0, /* bitsize */ | |
210 | false, /* pc_relative */ | |
211 | 0, /* bitpos */ | |
212 | complain_overflow_dont, /* complain_on_overflow */ | |
213 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
214 | "R_CRIS_GNU_VTENTRY", /* name */ | |
215 | false, /* partial_inplace */ | |
216 | 0, /* src_mask */ | |
217 | 0, /* dst_mask */ | |
915e5146 HPN |
218 | false), /* pcrel_offset */ |
219 | ||
220 | /* This is used only by the dynamic linker. The symbol should exist | |
221 | both in the object being run and in some shared library. The | |
222 | dynamic linker copies the data addressed by the symbol from the | |
223 | shared library into the object, because the object being | |
224 | run has to have the data at some particular address. */ | |
225 | HOWTO (R_CRIS_COPY, /* type */ | |
226 | 0, /* rightshift */ | |
227 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
228 | 32, /* bitsize */ | |
229 | false, /* pc_relative */ | |
230 | 0, /* bitpos */ | |
231 | complain_overflow_bitfield, /* complain_on_overflow */ | |
232 | bfd_elf_generic_reloc, /* special_function */ | |
233 | "R_CRIS_COPY", /* name */ | |
234 | false, /* partial_inplace */ | |
235 | 0, /* src_mask */ | |
236 | 0, /* dst_mask */ | |
237 | false), /* pcrel_offset */ | |
238 | ||
239 | /* Like R_CRIS_32, but used when setting global offset table entries. */ | |
240 | HOWTO (R_CRIS_GLOB_DAT, /* type */ | |
241 | 0, /* rightshift */ | |
242 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
243 | 32, /* bitsize */ | |
244 | false, /* pc_relative */ | |
245 | 0, /* bitpos */ | |
246 | complain_overflow_bitfield, /* complain_on_overflow */ | |
247 | bfd_elf_generic_reloc, /* special_function */ | |
248 | "R_CRIS_GLOB_DAT", /* name */ | |
249 | false, /* partial_inplace */ | |
250 | 0, /* src_mask */ | |
251 | 0xffffffff, /* dst_mask */ | |
252 | false), /* pcrel_offset */ | |
253 | ||
254 | /* Marks a procedure linkage table entry for a symbol. */ | |
255 | HOWTO (R_CRIS_JUMP_SLOT, /* type */ | |
256 | 0, /* rightshift */ | |
257 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
258 | 32, /* bitsize */ | |
259 | false, /* pc_relative */ | |
260 | 0, /* bitpos */ | |
261 | complain_overflow_bitfield, /* complain_on_overflow */ | |
262 | bfd_elf_generic_reloc, /* special_function */ | |
263 | "R_CRIS_JUMP_SLOT", /* name */ | |
264 | false, /* partial_inplace */ | |
265 | 0, /* src_mask */ | |
266 | 0, /* dst_mask */ | |
267 | false), /* pcrel_offset */ | |
268 | ||
269 | /* Used only by the dynamic linker. When the object is run, this | |
270 | longword is set to the load address of the object, plus the | |
271 | addend. */ | |
272 | HOWTO (R_CRIS_RELATIVE, /* type */ | |
273 | 0, /* rightshift */ | |
274 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
275 | 32, /* bitsize */ | |
276 | false, /* pc_relative */ | |
277 | 0, /* bitpos */ | |
278 | complain_overflow_bitfield, /* complain_on_overflow */ | |
279 | bfd_elf_generic_reloc, /* special_function */ | |
280 | "R_CRIS_RELATIVE", /* name */ | |
281 | false, /* partial_inplace */ | |
282 | 0, /* src_mask */ | |
283 | 0xffffffff, /* dst_mask */ | |
284 | false), /* pcrel_offset */ | |
285 | ||
286 | /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */ | |
287 | HOWTO (R_CRIS_16_GOT, /* type */ | |
288 | 0, /* rightshift */ | |
289 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
290 | 16, /* bitsize */ | |
291 | false, /* pc_relative */ | |
292 | 0, /* bitpos */ | |
293 | complain_overflow_bitfield, /* complain_on_overflow */ | |
294 | bfd_elf_generic_reloc, /* special_function */ | |
295 | "R_CRIS_16_GOT", /* name */ | |
296 | false, /* partial_inplace */ | |
297 | 0, /* src_mask */ | |
298 | 0xffff, /* dst_mask */ | |
299 | false), /* pcrel_offset */ | |
300 | ||
301 | HOWTO (R_CRIS_32_GOT, /* type */ | |
302 | 0, /* rightshift */ | |
303 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
304 | 32, /* bitsize */ | |
305 | false, /* pc_relative */ | |
306 | 0, /* bitpos */ | |
307 | complain_overflow_bitfield, /* complain_on_overflow */ | |
308 | bfd_elf_generic_reloc, /* special_function */ | |
309 | "R_CRIS_32_GOT", /* name */ | |
310 | false, /* partial_inplace */ | |
311 | 0, /* src_mask */ | |
312 | 0xffffffff, /* dst_mask */ | |
313 | false), /* pcrel_offset */ | |
314 | ||
315 | /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of | |
316 | the GOT table for the symbol. */ | |
317 | HOWTO (R_CRIS_16_GOTPLT, /* type */ | |
318 | 0, /* rightshift */ | |
319 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
320 | 16, /* bitsize */ | |
321 | false, /* pc_relative */ | |
322 | 0, /* bitpos */ | |
323 | complain_overflow_bitfield, /* complain_on_overflow */ | |
324 | bfd_elf_generic_reloc, /* special_function */ | |
325 | "R_CRIS_16_GOTPLT", /* name */ | |
326 | false, /* partial_inplace */ | |
327 | 0, /* src_mask */ | |
328 | 0xffff, /* dst_mask */ | |
329 | false), /* pcrel_offset */ | |
330 | ||
331 | HOWTO (R_CRIS_32_GOTPLT, /* type */ | |
332 | 0, /* rightshift */ | |
333 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
334 | 32, /* bitsize */ | |
335 | false, /* pc_relative */ | |
336 | 0, /* bitpos */ | |
337 | complain_overflow_bitfield, /* complain_on_overflow */ | |
338 | bfd_elf_generic_reloc, /* special_function */ | |
339 | "R_CRIS_32_GOTPLT", /* name */ | |
340 | false, /* partial_inplace */ | |
341 | 0, /* src_mask */ | |
342 | 0xffffffff, /* dst_mask */ | |
343 | false), /* pcrel_offset */ | |
344 | ||
345 | /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should | |
346 | be necessary. */ | |
347 | HOWTO (R_CRIS_32_GOTREL, /* type */ | |
348 | 0, /* rightshift */ | |
349 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
350 | 32, /* bitsize */ | |
351 | false, /* pc_relative */ | |
352 | 0, /* bitpos */ | |
353 | complain_overflow_bitfield, /* complain_on_overflow */ | |
354 | bfd_elf_generic_reloc, /* special_function */ | |
355 | "R_CRIS_32_GOTREL", /* name */ | |
356 | false, /* partial_inplace */ | |
357 | 0, /* src_mask */ | |
358 | 0xffffffff, /* dst_mask */ | |
359 | false), /* pcrel_offset */ | |
360 | ||
361 | /* A 32-bit offset from GOT to entry for this symbol in PLT and request | |
362 | to create PLT entry for symbol. */ | |
363 | HOWTO (R_CRIS_32_PLT_GOTREL, /* type */ | |
364 | 0, /* rightshift */ | |
365 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
366 | 32, /* bitsize */ | |
367 | false, /* pc_relative */ | |
368 | 0, /* bitpos */ | |
369 | complain_overflow_bitfield, /* complain_on_overflow */ | |
370 | bfd_elf_generic_reloc, /* special_function */ | |
371 | "R_CRIS_32_PLT_GOTREL", /* name */ | |
372 | false, /* partial_inplace */ | |
373 | 0, /* src_mask */ | |
374 | 0xffffffff, /* dst_mask */ | |
375 | false), /* pcrel_offset */ | |
376 | ||
377 | /* A 32-bit offset from PC (location after the relocation) + addend to | |
378 | entry for this symbol in PLT and request to create PLT entry for | |
379 | symbol. */ | |
380 | HOWTO (R_CRIS_32_PLT_PCREL, /* type */ | |
381 | 0, /* rightshift */ | |
382 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
383 | 32, /* bitsize */ | |
384 | true, /* pc_relative */ | |
385 | 0, /* bitpos */ | |
386 | complain_overflow_bitfield, /* complain_on_overflow */ | |
387 | bfd_elf_generic_reloc, /* special_function */ | |
388 | "R_CRIS_32_PLT_PCREL", /* name */ | |
389 | false, /* partial_inplace */ | |
390 | 0, /* src_mask */ | |
391 | 0xffffffff, /* dst_mask */ | |
392 | true) /* pcrel_offset */ | |
06c15ad7 HPN |
393 | }; |
394 | \f | |
395 | /* Map BFD reloc types to CRIS ELF reloc types. */ | |
396 | ||
397 | struct cris_reloc_map | |
398 | { | |
399 | bfd_reloc_code_real_type bfd_reloc_val; | |
400 | unsigned int cris_reloc_val; | |
401 | }; | |
402 | ||
403 | static const struct cris_reloc_map cris_reloc_map [] = | |
404 | { | |
405 | { BFD_RELOC_NONE, R_CRIS_NONE }, | |
406 | { BFD_RELOC_8, R_CRIS_8 }, | |
407 | { BFD_RELOC_16, R_CRIS_16 }, | |
408 | { BFD_RELOC_32, R_CRIS_32 }, | |
409 | { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, | |
410 | { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, | |
411 | { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, | |
412 | { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, | |
915e5146 HPN |
413 | { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }, |
414 | { BFD_RELOC_CRIS_COPY, R_CRIS_COPY }, | |
415 | { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT }, | |
416 | { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT }, | |
417 | { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE }, | |
418 | { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT }, | |
419 | { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT }, | |
420 | { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT }, | |
421 | { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT }, | |
422 | { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL }, | |
423 | { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL }, | |
424 | { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL } | |
06c15ad7 HPN |
425 | }; |
426 | ||
427 | static reloc_howto_type * | |
428 | cris_reloc_type_lookup (abfd, code) | |
429 | bfd * abfd ATTRIBUTE_UNUSED; | |
430 | bfd_reloc_code_real_type code; | |
431 | { | |
432 | unsigned int i; | |
433 | ||
434 | for (i = sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); | |
435 | --i;) | |
436 | if (cris_reloc_map [i].bfd_reloc_val == code) | |
437 | return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; | |
a7c10850 | 438 | |
06c15ad7 HPN |
439 | return NULL; |
440 | } | |
441 | ||
442 | /* Set the howto pointer for an CRIS ELF reloc. */ | |
443 | ||
444 | static void | |
445 | cris_info_to_howto_rela (abfd, cache_ptr, dst) | |
446 | bfd * abfd ATTRIBUTE_UNUSED; | |
447 | arelent * cache_ptr; | |
448 | Elf32_Internal_Rela * dst; | |
449 | { | |
450 | unsigned int r_type; | |
451 | ||
452 | r_type = ELF32_R_TYPE (dst->r_info); | |
453 | BFD_ASSERT (r_type < (unsigned int) R_CRIS_max); | |
454 | cache_ptr->howto = & cris_elf_howto_table [r_type]; | |
455 | } | |
456 | \f | |
915e5146 HPN |
457 | /* The name of the dynamic interpreter. This is put in the .interp |
458 | section. */ | |
459 | ||
460 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" | |
461 | ||
462 | /* The size in bytes of an entry in the procedure linkage table. */ | |
463 | ||
464 | #define PLT_ENTRY_SIZE 20 | |
465 | ||
466 | /* The first entry in an absolute procedure linkage table looks like this. */ | |
467 | ||
468 | static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] = | |
469 | { | |
470 | 0xfc, 0xe1, | |
471 | 0x7e, 0x7e, /* push mof. */ | |
472 | 0x7f, 0x0d, /* (dip [pc+]) */ | |
473 | 0, 0, 0, 0, /* Replaced with address of .got + 4. */ | |
474 | 0x30, 0x7a, /* move [...],mof */ | |
475 | 0x7f, 0x0d, /* (dip [pc+]) */ | |
476 | 0, 0, 0, 0, /* Replaced with address of .got + 8. */ | |
477 | 0x30, 0x09, /* jump [...] */ | |
478 | }; | |
479 | ||
480 | /* Subsequent entries in an absolute procedure linkage table look like | |
481 | this. */ | |
482 | ||
483 | static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] = | |
484 | { | |
485 | 0x7f, 0x0d, /* (dip [pc+]) */ | |
486 | 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ | |
487 | 0x30, 0x09, /* jump [...] */ | |
488 | 0x3f, 0x7e, /* move [pc+],mof */ | |
489 | 0, 0, 0, 0, /* Replaced with offset into relocation table. */ | |
490 | 0x2f, 0xfe, /* add.d [pc+],pc */ | |
491 | 0xec, 0xff, | |
492 | 0xff, 0xff /* Replaced with offset to start of .plt. */ | |
493 | }; | |
494 | ||
495 | /* The first entry in a PIC procedure linkage table looks like this. */ | |
496 | ||
497 | static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] = | |
498 | { | |
499 | 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */ | |
500 | 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */ | |
501 | 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */ | |
502 | 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */ | |
503 | }; | |
504 | ||
505 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
506 | ||
507 | static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] = | |
508 | { | |
509 | 0x6f, 0x0d, /* (bdap [pc+].d,r0) */ | |
510 | 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ | |
511 | 0x30, 0x09, /* jump [...] */ | |
512 | 0x3f, 0x7e, /* move [pc+],mof */ | |
513 | 0, 0, 0, 0, /* Replaced with offset into relocation table. */ | |
514 | 0x2f, 0xfe, /* add.d [pc+],pc */ | |
515 | 0xec, 0xff, /* Replaced with offset to start of .plt. */ | |
516 | 0xff, 0xff | |
517 | }; | |
518 | \f | |
519 | /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits | |
520 | (and most other PIC/shlib stuff). Check that we don't drift away | |
521 | without reason. | |
522 | ||
523 | The CRIS linker, like the m68k and i386 linkers (and probably the rest | |
524 | too) needs to keep track of the number of relocs that it decides to | |
525 | copy in check_relocs for each symbol. This is so that it can discard | |
526 | PC relative relocs if it doesn't need them when linking with | |
527 | -Bsymbolic. We store the information in a field extending the regular | |
528 | ELF linker hash table. */ | |
529 | ||
530 | /* This structure keeps track of the number of PC relative relocs we have | |
531 | copied for a given symbol. */ | |
532 | ||
533 | struct elf_cris_pcrel_relocs_copied | |
534 | { | |
535 | /* Next section. */ | |
536 | struct elf_cris_pcrel_relocs_copied *next; | |
537 | /* A section in dynobj. */ | |
538 | asection *section; | |
539 | /* Number of relocs copied in this section. */ | |
540 | bfd_size_type count; | |
541 | }; | |
542 | ||
543 | /* CRIS ELF linker hash entry. */ | |
544 | ||
545 | struct elf_cris_link_hash_entry | |
546 | { | |
547 | struct elf_link_hash_entry root; | |
548 | ||
549 | /* Number of PC relative relocs copied for this symbol. */ | |
550 | struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied; | |
551 | ||
552 | /* The GOTPLT references are CRIS-specific; the goal is to avoid having | |
553 | both a general GOT and a PLT-specific GOT entry for the same symbol, | |
554 | when it is referenced both as a function and as a function pointer. | |
555 | ||
556 | Number of GOTPLT references for a function. */ | |
557 | bfd_signed_vma gotplt_refcount; | |
558 | ||
559 | /* Actual GOTPLT index for this symbol, if applicable, or zero if not | |
560 | (zero is never used as an index). FIXME: We should be able to fold | |
561 | this with gotplt_refcount in a union, like the got and plt unions in | |
562 | elf_link_hash_entry. */ | |
563 | bfd_size_type gotplt_offset; | |
564 | }; | |
565 | ||
566 | /* CRIS ELF linker hash table. */ | |
567 | ||
568 | struct elf_cris_link_hash_table | |
569 | { | |
570 | struct elf_link_hash_table root; | |
571 | ||
572 | /* We can't use the PLT offset and calculate to get the GOTPLT offset, | |
573 | since we try and avoid creating GOTPLT:s when there's already a GOT. | |
574 | Instead, we keep and update the next available index here. */ | |
575 | bfd_size_type next_gotplt_entry; | |
576 | }; | |
577 | ||
578 | /* Traverse a CRIS ELF linker hash table. */ | |
579 | ||
580 | #define elf_cris_link_hash_traverse(table, func, info) \ | |
581 | (elf_link_hash_traverse \ | |
582 | (&(table)->root, \ | |
583 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
584 | (info))) | |
585 | ||
586 | /* Get the CRIS ELF linker hash table from a link_info structure. */ | |
587 | ||
588 | #define elf_cris_hash_table(p) \ | |
589 | ((struct elf_cris_link_hash_table *) (p)->hash) | |
590 | ||
591 | /* Create an entry in a CRIS ELF linker hash table. */ | |
592 | ||
593 | static struct bfd_hash_entry * | |
594 | elf_cris_link_hash_newfunc (entry, table, string) | |
595 | struct bfd_hash_entry *entry; | |
596 | struct bfd_hash_table *table; | |
597 | const char *string; | |
598 | { | |
599 | struct elf_cris_link_hash_entry *ret = | |
600 | (struct elf_cris_link_hash_entry *) entry; | |
601 | ||
602 | /* Allocate the structure if it has not already been allocated by a | |
603 | subclass. */ | |
604 | if (ret == (struct elf_cris_link_hash_entry *) NULL) | |
605 | ret = ((struct elf_cris_link_hash_entry *) | |
606 | bfd_hash_allocate (table, | |
607 | sizeof (struct elf_cris_link_hash_entry))); | |
608 | if (ret == (struct elf_cris_link_hash_entry *) NULL) | |
609 | return (struct bfd_hash_entry *) ret; | |
610 | ||
611 | /* Call the allocation method of the superclass. */ | |
612 | ret = ((struct elf_cris_link_hash_entry *) | |
613 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
614 | table, string)); | |
615 | if (ret != (struct elf_cris_link_hash_entry *) NULL) | |
616 | { | |
617 | ret->pcrel_relocs_copied = NULL; | |
618 | ret->gotplt_refcount = 0; | |
619 | ret->gotplt_offset = 0; | |
620 | } | |
621 | ||
622 | return (struct bfd_hash_entry *) ret; | |
623 | } | |
624 | ||
625 | /* Create a CRIS ELF linker hash table. */ | |
626 | ||
627 | static struct bfd_link_hash_table * | |
628 | elf_cris_link_hash_table_create (abfd) | |
629 | bfd *abfd; | |
630 | { | |
631 | struct elf_cris_link_hash_table *ret; | |
632 | ||
633 | ret = ((struct elf_cris_link_hash_table *) | |
634 | bfd_alloc (abfd, sizeof (struct elf_cris_link_hash_table))); | |
635 | if (ret == (struct elf_cris_link_hash_table *) NULL) | |
636 | return NULL; | |
637 | ||
638 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
639 | elf_cris_link_hash_newfunc)) | |
640 | { | |
641 | bfd_release (abfd, ret); | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | /* Initialize to skip over the first three entries in the gotplt; they | |
646 | are used for run-time symbol evaluation. */ | |
647 | ret->next_gotplt_entry = 12; | |
648 | ||
649 | return &ret->root.root; | |
650 | } | |
651 | \f | |
06c15ad7 | 652 | /* Perform a single relocation. By default we use the standard BFD |
915e5146 | 653 | routines, with a few tweaks. */ |
06c15ad7 HPN |
654 | |
655 | static bfd_reloc_status_type | |
656 | cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, | |
657 | relocation) | |
658 | reloc_howto_type * howto; | |
659 | bfd * input_bfd; | |
660 | asection * input_section; | |
661 | bfd_byte * contents; | |
662 | Elf_Internal_Rela * rel; | |
663 | bfd_vma relocation; | |
664 | { | |
915e5146 HPN |
665 | bfd_reloc_status_type r; |
666 | ||
667 | /* PC-relative relocations are relative to the position *after* | |
668 | the reloc. Note that for R_CRIS_8_PCREL the adjustment is | |
669 | not a single byte, since PC must be 16-bit-aligned. */ | |
670 | switch (ELF32_R_TYPE (rel->r_info)) | |
671 | { | |
672 | /* Check that the 16-bit GOT relocs are positive. */ | |
673 | case R_CRIS_16_GOTPLT: | |
674 | case R_CRIS_16_GOT: | |
675 | if ((bfd_signed_vma) relocation < 0) | |
676 | return bfd_reloc_overflow; | |
677 | break; | |
678 | ||
679 | case R_CRIS_32_PLT_PCREL: | |
680 | case R_CRIS_32_PCREL: | |
681 | relocation -= 2; | |
682 | /* Fall through. */ | |
683 | case R_CRIS_8_PCREL: | |
684 | case R_CRIS_16_PCREL: | |
685 | relocation -= 2; | |
686 | break; | |
687 | ||
688 | default: | |
689 | break; | |
690 | } | |
691 | ||
692 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
06c15ad7 HPN |
693 | contents, rel->r_offset, |
694 | relocation, rel->r_addend); | |
695 | return r; | |
696 | } | |
697 | \f | |
698 | /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was | |
699 | copied, for further comments. */ | |
700 | ||
701 | static boolean | |
702 | cris_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
703 | contents, relocs, local_syms, local_sections) | |
704 | bfd * output_bfd ATTRIBUTE_UNUSED; | |
705 | struct bfd_link_info * info; | |
706 | bfd * input_bfd; | |
707 | asection * input_section; | |
708 | bfd_byte * contents; | |
709 | Elf_Internal_Rela * relocs; | |
710 | Elf_Internal_Sym * local_syms; | |
711 | asection ** local_sections; | |
712 | { | |
915e5146 | 713 | bfd *dynobj; |
06c15ad7 HPN |
714 | Elf_Internal_Shdr * symtab_hdr; |
715 | struct elf_link_hash_entry ** sym_hashes; | |
915e5146 HPN |
716 | bfd_vma *local_got_offsets; |
717 | asection *sgot; | |
718 | asection *splt; | |
719 | asection *sreloc; | |
06c15ad7 HPN |
720 | Elf_Internal_Rela * rel; |
721 | Elf_Internal_Rela * relend; | |
722 | ||
915e5146 HPN |
723 | dynobj = elf_hash_table (info)->dynobj; |
724 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
06c15ad7 HPN |
725 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
726 | sym_hashes = elf_sym_hashes (input_bfd); | |
727 | relend = relocs + input_section->reloc_count; | |
728 | ||
729 | /* It seems this can happen with erroneous or unsupported input (mixing | |
730 | a.out and elf in an archive, for example.) */ | |
731 | if (sym_hashes == NULL) | |
732 | return false; | |
733 | ||
915e5146 HPN |
734 | sgot = NULL; |
735 | splt = NULL; | |
736 | sreloc = NULL; | |
737 | ||
738 | if (dynobj != NULL) | |
739 | { | |
740 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
741 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
742 | } | |
743 | ||
06c15ad7 HPN |
744 | for (rel = relocs; rel < relend; rel ++) |
745 | { | |
746 | reloc_howto_type * howto; | |
747 | unsigned long r_symndx; | |
748 | Elf_Internal_Sym * sym; | |
749 | asection * sec; | |
750 | struct elf_link_hash_entry * h; | |
751 | bfd_vma relocation; | |
752 | bfd_reloc_status_type r; | |
753 | const char * name = NULL; | |
754 | int r_type; | |
a7c10850 | 755 | |
06c15ad7 | 756 | r_type = ELF32_R_TYPE (rel->r_info); |
a7c10850 | 757 | |
06c15ad7 HPN |
758 | if ( r_type == R_CRIS_GNU_VTINHERIT |
759 | || r_type == R_CRIS_GNU_VTENTRY) | |
760 | continue; | |
a7c10850 | 761 | |
06c15ad7 HPN |
762 | r_symndx = ELF32_R_SYM (rel->r_info); |
763 | ||
764 | if (info->relocateable) | |
765 | { | |
766 | /* This is a relocateable link. We don't have to change | |
767 | anything, unless the reloc is against a section symbol, | |
768 | in which case we have to adjust according to where the | |
769 | section symbol winds up in the output section. */ | |
770 | if (r_symndx < symtab_hdr->sh_info) | |
771 | { | |
772 | sym = local_syms + r_symndx; | |
a7c10850 | 773 | |
06c15ad7 HPN |
774 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
775 | { | |
776 | sec = local_sections [r_symndx]; | |
777 | rel->r_addend += sec->output_offset + sym->st_value; | |
778 | } | |
779 | } | |
780 | ||
781 | continue; | |
782 | } | |
783 | ||
784 | /* This is a final link. */ | |
915e5146 | 785 | howto = cris_elf_howto_table + r_type; |
06c15ad7 HPN |
786 | h = NULL; |
787 | sym = NULL; | |
788 | sec = NULL; | |
a7c10850 | 789 | |
06c15ad7 HPN |
790 | if (r_symndx < symtab_hdr->sh_info) |
791 | { | |
792 | sym = local_syms + r_symndx; | |
793 | sec = local_sections [r_symndx]; | |
794 | relocation = (sec->output_section->vma | |
795 | + sec->output_offset | |
796 | + sym->st_value); | |
a7c10850 | 797 | |
06c15ad7 HPN |
798 | name = bfd_elf_string_from_elf_section |
799 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
800 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
06c15ad7 HPN |
801 | } |
802 | else | |
803 | { | |
804 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
a7c10850 | 805 | |
06c15ad7 HPN |
806 | while (h->root.type == bfd_link_hash_indirect |
807 | || h->root.type == bfd_link_hash_warning) | |
808 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
809 | ||
810 | name = h->root.root.string; | |
a7c10850 | 811 | |
06c15ad7 HPN |
812 | if (h->root.type == bfd_link_hash_defined |
813 | || h->root.type == bfd_link_hash_defweak) | |
814 | { | |
815 | sec = h->root.u.def.section; | |
915e5146 HPN |
816 | |
817 | /* Perhaps we should detect the cases that | |
818 | sec->output_section is expected to be NULL like i386 and | |
819 | m68k, but apparently (and according to elfxx-ia64.c) all | |
820 | valid cases are where the symbol is defined in a shared | |
821 | object which we link dynamically against. This includes | |
822 | PLT relocs for which we've created a PLT entry and other | |
823 | relocs for which we're prepared to create dynamic | |
824 | relocations. | |
825 | ||
826 | For now, new situations cause us to just err when | |
827 | sec->output_offset is NULL but the object with the symbol | |
828 | is *not* dynamically linked against. Thus this will | |
829 | automatically remind us so we can see if there are other | |
830 | valid cases we need to revisit. */ | |
831 | if ((sec->output_section == NULL | |
832 | && (sec->owner->flags & DYNAMIC) != 0) | |
833 | ||
834 | /* Here follow the cases where the relocation value must | |
835 | be zero (or when further handling is simplified when | |
836 | zero). I can't claim to understand the various | |
837 | conditions and they weren't described in the files | |
838 | where I copied them from (elf32-m68k.c and | |
839 | elf32-i386.c), but let's mention examples of where | |
840 | they happen. FIXME: Perhaps define and use a | |
841 | dynamic_symbol_p function like ia64. | |
842 | ||
843 | - When creating a shared library, we can have an | |
844 | ordinary relocation for a symbol defined in a shared | |
845 | library (perhaps the one we create). We then make | |
846 | the relocation value zero, as the value seen now will | |
847 | be added into the relocation addend in this shared | |
848 | library, but must be handled only at dynamic-link | |
849 | time. FIXME: Not sure this example covers the | |
850 | h->elf_link_hash_flags test, though it's there in | |
851 | other targets. */ | |
852 | || (info->shared | |
853 | && ((! info->symbolic && h->dynindx != -1) | |
854 | || (h->elf_link_hash_flags | |
855 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
856 | && (input_section->flags & SEC_ALLOC) != 0 | |
857 | && (r_type == R_CRIS_8 | |
858 | || r_type == R_CRIS_16 | |
859 | || r_type == R_CRIS_32 | |
860 | || r_type == R_CRIS_8_PCREL | |
861 | || r_type == R_CRIS_16_PCREL | |
862 | || r_type == R_CRIS_32_PCREL))) | |
863 | relocation = 0; | |
864 | else if (sec->output_section != NULL) | |
865 | relocation = (h->root.u.def.value | |
866 | + sec->output_section->vma | |
867 | + sec->output_offset); | |
868 | else | |
869 | { | |
870 | if (input_bfd->my_archive) | |
871 | (*_bfd_error_handler) | |
872 | (_("%s(%s): unresolvable relocation %s against symbol `%s' from %s section"), | |
873 | bfd_get_filename (bfd_my_archive (input_bfd)), | |
874 | bfd_get_filename (input_bfd), | |
875 | cris_elf_howto_table[r_type].name, | |
876 | name, | |
877 | bfd_get_section_name (input_bfd, input_section)); | |
878 | else | |
879 | (*_bfd_error_handler) | |
880 | (_("%s: unresolvable relocation %s against symbol `%s' from %s section"), | |
881 | bfd_get_filename (input_bfd), | |
882 | cris_elf_howto_table[r_type].name, | |
883 | name, | |
884 | bfd_get_section_name (input_bfd, input_section)); | |
885 | bfd_set_error (bfd_error_bad_value); | |
886 | return false; | |
887 | } | |
06c15ad7 HPN |
888 | } |
889 | else if (h->root.type == bfd_link_hash_undefweak) | |
915e5146 | 890 | relocation = 0; |
06c15ad7 | 891 | else if (info->shared |
915e5146 HPN |
892 | && !info->symbolic |
893 | && !info->no_undefined | |
06c15ad7 HPN |
894 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
895 | relocation = 0; | |
896 | else | |
897 | { | |
915e5146 HPN |
898 | if (!(info->callbacks->undefined_symbol |
899 | (info, name, input_bfd, | |
900 | input_section, rel->r_offset, | |
901 | (!info->shared || info->no_undefined | |
902 | || ELF_ST_VISIBILITY (h->other))))) | |
06c15ad7 | 903 | return false; |
06c15ad7 HPN |
904 | relocation = 0; |
905 | } | |
906 | } | |
a7c10850 | 907 | |
915e5146 | 908 | switch (r_type) |
06c15ad7 | 909 | { |
915e5146 HPN |
910 | case R_CRIS_16_GOTPLT: |
911 | case R_CRIS_32_GOTPLT: | |
912 | /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT, | |
913 | but we require a PLT, and the PLT handling will take care of | |
914 | filling in the PLT-specific GOT entry. For the GOT offset, | |
915 | calculate it as we do when filling it in for the .got.plt | |
916 | section. If we don't have a PLT, punt to GOT handling. */ | |
917 | if (h != NULL | |
918 | && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0) | |
06c15ad7 | 919 | { |
915e5146 HPN |
920 | asection *sgotplt |
921 | = bfd_get_section_by_name (dynobj, ".got.plt"); | |
922 | bfd_vma got_offset; | |
a7c10850 | 923 | |
915e5146 HPN |
924 | BFD_ASSERT (h->dynindx != -1); |
925 | BFD_ASSERT (sgotplt != NULL); | |
a7c10850 | 926 | |
915e5146 HPN |
927 | got_offset |
928 | = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; | |
06c15ad7 | 929 | |
915e5146 | 930 | relocation = got_offset; |
06c15ad7 | 931 | break; |
915e5146 | 932 | } |
06c15ad7 | 933 | |
915e5146 HPN |
934 | /* We didn't make a PLT entry for this symbol, or everything is |
935 | folded into the GOT. Other than folding, this happens when | |
936 | statically linking PIC code, or when using -Bsymbolic. Check | |
937 | that we instead have a GOT entry as done for us by | |
938 | elf_cris_adjust_dynamic_symbol, and drop through into the | |
939 | ordinary GOT cases. */ | |
940 | if (h != NULL && h->got.offset == (bfd_vma) -1) | |
941 | { | |
942 | (*_bfd_error_handler) | |
943 | (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"), | |
944 | bfd_get_filename (input_bfd), | |
945 | cris_elf_howto_table[r_type].name, | |
946 | name[0] != '\0' ? name : _("[whose name is lost]"), | |
947 | bfd_get_section_name (input_bfd, input_section)); | |
948 | ||
949 | /* FIXME: Perhaps blaming input is not the right thing to | |
950 | do; this is probably an internal error. But it is true | |
951 | that we didn't like that particular input. */ | |
952 | bfd_set_error (bfd_error_bad_value); | |
953 | return false; | |
954 | } | |
955 | /* Fall through. */ | |
956 | ||
957 | /* The size of the actual relocation is not used here; we only | |
958 | fill in the GOT table here. */ | |
959 | case R_CRIS_16_GOT: | |
960 | case R_CRIS_32_GOT: | |
961 | { | |
962 | bfd_vma off; | |
963 | ||
964 | /* Note that despite using RELA relocations, the .got contents | |
965 | is always filled in with the link-relative relocation | |
966 | value; the addend. */ | |
967 | ||
968 | if (h != NULL) | |
969 | { | |
970 | off = h->got.offset; | |
971 | BFD_ASSERT (off != (bfd_vma) -1); | |
972 | ||
973 | if (!elf_hash_table (info)->dynamic_sections_created | |
974 | || (info->shared | |
975 | && (info->symbolic || h->dynindx == -1) | |
976 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
977 | { | |
978 | /* This is actually a static link, or it is a | |
979 | -Bsymbolic link and the symbol is defined | |
980 | locally, or the symbol was forced to be local | |
981 | because of a version file. We must initialize | |
982 | this entry in the global offset table. Since | |
983 | the offset must always be a multiple of 4, we | |
984 | use the least significant bit to record whether | |
985 | we have initialized it already. | |
986 | ||
987 | When doing a dynamic link, we create a .rela.got | |
988 | relocation entry to initialize the value. This | |
989 | is done in the finish_dynamic_symbol routine. */ | |
990 | if ((off & 1) != 0) | |
991 | off &= ~1; | |
992 | else | |
993 | { | |
994 | bfd_put_32 (output_bfd, relocation, | |
995 | sgot->contents + off); | |
996 | h->got.offset |= 1; | |
997 | } | |
998 | } | |
999 | } | |
1000 | else | |
1001 | { | |
1002 | BFD_ASSERT (local_got_offsets != NULL | |
1003 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1004 | ||
1005 | off = local_got_offsets[r_symndx]; | |
1006 | ||
1007 | /* The offset must always be a multiple of 4. We use | |
1008 | the least significant bit to record whether we have | |
1009 | already generated the necessary reloc. */ | |
1010 | if ((off & 1) != 0) | |
1011 | off &= ~1; | |
1012 | else | |
1013 | { | |
1014 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
1015 | ||
1016 | if (info->shared) | |
1017 | { | |
1018 | asection *srelgot; | |
1019 | Elf_Internal_Rela outrel; | |
1020 | ||
1021 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1022 | BFD_ASSERT (srelgot != NULL); | |
1023 | ||
1024 | outrel.r_offset = (sgot->output_section->vma | |
1025 | + sgot->output_offset | |
1026 | + off); | |
1027 | outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); | |
1028 | outrel.r_addend = relocation; | |
1029 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1030 | (((Elf32_External_Rela *) | |
1031 | srelgot->contents) | |
1032 | + srelgot->reloc_count)); | |
1033 | ++srelgot->reloc_count; | |
1034 | } | |
1035 | ||
1036 | local_got_offsets[r_symndx] |= 1; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | relocation = sgot->output_offset + off; | |
1041 | if (rel->r_addend != 0) | |
1042 | { | |
1043 | /* We can't do anything for a relocation which is against | |
1044 | a symbol *plus offset*. GOT holds relocations for | |
1045 | symbols. Make this an error; the compiler isn't | |
1046 | allowed to pass us these kinds of things. */ | |
1047 | if (h == NULL) | |
1048 | (*_bfd_error_handler) | |
1049 | (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"), | |
1050 | bfd_get_filename (input_bfd), | |
1051 | cris_elf_howto_table[r_type].name, | |
1052 | rel->r_addend, | |
1053 | bfd_get_section_name (input_bfd, input_section)); | |
1054 | else | |
1055 | (*_bfd_error_handler) | |
1056 | (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"), | |
1057 | bfd_get_filename (input_bfd), | |
1058 | cris_elf_howto_table[r_type].name, | |
1059 | rel->r_addend, | |
1060 | name[0] != '\0' ? name : _("[whose name is lost]"), | |
1061 | bfd_get_section_name (input_bfd, input_section)); | |
1062 | ||
1063 | bfd_set_error (bfd_error_bad_value); | |
1064 | return false; | |
1065 | } | |
1066 | } | |
1067 | break; | |
06c15ad7 | 1068 | |
915e5146 HPN |
1069 | case R_CRIS_32_GOTREL: |
1070 | /* This relocation must only be performed against local symbols. */ | |
1071 | if (h != NULL) | |
1072 | { | |
1073 | (*_bfd_error_handler) | |
1074 | (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"), | |
1075 | bfd_get_filename (input_bfd), | |
1076 | cris_elf_howto_table[r_type].name, | |
1077 | name, | |
1078 | bfd_get_section_name (input_bfd, input_section)); | |
1079 | bfd_set_error (bfd_error_bad_value); | |
1080 | return false; | |
06c15ad7 HPN |
1081 | } |
1082 | ||
915e5146 HPN |
1083 | /* This relocation is like a PC-relative one, except the |
1084 | reference point is the location of GOT. Note that | |
1085 | sgot->output_offset is not involved in this calculation. We | |
1086 | always want the start of entire .got section, not the | |
1087 | position after the reserved header. */ | |
1088 | relocation -= sgot->output_section->vma; | |
1089 | break; | |
06c15ad7 | 1090 | |
915e5146 HPN |
1091 | case R_CRIS_32_PLT_PCREL: |
1092 | /* Relocation is to the entry for this symbol in the | |
1093 | procedure linkage table. */ | |
06c15ad7 | 1094 | |
915e5146 HPN |
1095 | /* Resolve a PLT_PCREL reloc against a local symbol directly, |
1096 | without using the procedure linkage table. */ | |
1097 | if (h == NULL) | |
1098 | break; | |
1099 | ||
1100 | if (h->plt.offset == (bfd_vma) -1 | |
1101 | || splt == NULL) | |
1102 | { | |
1103 | /* We didn't make a PLT entry for this symbol. This | |
1104 | happens when statically linking PIC code, or when | |
1105 | using -Bsymbolic. */ | |
1106 | break; | |
1107 | } | |
1108 | ||
1109 | relocation = (splt->output_section->vma | |
1110 | + splt->output_offset | |
1111 | + h->plt.offset); | |
1112 | break; | |
1113 | ||
1114 | case R_CRIS_32_PLT_GOTREL: | |
1115 | /* Like R_CRIS_32_PLT_PCREL, but the reference point is the | |
1116 | start of the .got section. See also comment at | |
1117 | R_CRIS_32_GOT. */ | |
1118 | relocation -= sgot->output_section->vma; | |
1119 | ||
1120 | /* Resolve a PLT_GOTREL reloc against a local symbol directly, | |
1121 | without using the procedure linkage table. */ | |
1122 | if (h == NULL) | |
1123 | break; | |
1124 | ||
1125 | if (h->plt.offset == (bfd_vma) -1 | |
1126 | || splt == NULL) | |
1127 | { | |
1128 | /* We didn't make a PLT entry for this symbol. This | |
1129 | happens when statically linking PIC code, or when | |
1130 | using -Bsymbolic. */ | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | relocation = (splt->output_section->vma | |
1135 | + splt->output_offset | |
1136 | + h->plt.offset | |
1137 | - sgot->output_section->vma); | |
1138 | break; | |
1139 | ||
1140 | case R_CRIS_8_PCREL: | |
1141 | case R_CRIS_16_PCREL: | |
1142 | case R_CRIS_32_PCREL: | |
1143 | /* If the symbol was local, we need no shlib-specific handling. */ | |
1144 | if (h == NULL) | |
1145 | break; | |
1146 | ||
1147 | /* Fall through. */ | |
1148 | case R_CRIS_8: | |
1149 | case R_CRIS_16: | |
1150 | case R_CRIS_32: | |
1151 | if (info->shared | |
1152 | && (input_section->flags & SEC_ALLOC) != 0 | |
1153 | && ((r_type != R_CRIS_8_PCREL | |
1154 | && r_type != R_CRIS_16_PCREL | |
1155 | && r_type != R_CRIS_32_PCREL) | |
1156 | || (!info->symbolic | |
1157 | || (h->elf_link_hash_flags | |
1158 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
1159 | { | |
1160 | Elf_Internal_Rela outrel; | |
1161 | boolean skip, relocate; | |
1162 | ||
1163 | /* When generating a shared object, these relocations | |
1164 | are copied into the output file to be resolved at run | |
1165 | time. */ | |
1166 | ||
1167 | if (sreloc == NULL) | |
1168 | { | |
1169 | const char *name; | |
1170 | ||
1171 | name = (bfd_elf_string_from_elf_section | |
1172 | (input_bfd, | |
1173 | elf_elfheader (input_bfd)->e_shstrndx, | |
1174 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1175 | if (name == NULL) | |
1176 | return false; | |
1177 | ||
1178 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
1179 | && strcmp (bfd_get_section_name (input_bfd, | |
1180 | input_section), | |
1181 | name + 5) == 0); | |
1182 | ||
1183 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1184 | ||
1185 | /* That section should have been created in | |
1186 | cris_elf_check_relocs, but that function will not be | |
1187 | called for objects which fail in | |
1188 | cris_elf_merge_private_bfd_data. */ | |
1189 | if (sreloc == NULL) | |
1190 | { | |
1191 | (*_bfd_error_handler) | |
1192 | (_("%s: Internal inconsistency; no relocation section %s"), | |
1193 | bfd_get_filename (input_bfd), | |
1194 | name); | |
1195 | ||
1196 | bfd_set_error (bfd_error_bad_value); | |
1197 | return false; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | skip = false; | |
1202 | ||
1203 | if (elf_section_data (input_section)->stab_info == NULL) | |
1204 | outrel.r_offset = rel->r_offset; | |
1205 | else | |
1206 | { | |
1207 | bfd_vma off; | |
1208 | ||
1209 | off = (_bfd_stab_section_offset | |
1210 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1211 | input_section, | |
1212 | &elf_section_data (input_section)->stab_info, | |
1213 | rel->r_offset)); | |
1214 | if (off == (bfd_vma) -1) | |
1215 | skip = true; | |
1216 | outrel.r_offset = off; | |
1217 | } | |
1218 | ||
1219 | outrel.r_offset += (input_section->output_section->vma | |
1220 | + input_section->output_offset); | |
1221 | ||
1222 | if (skip) | |
1223 | { | |
1224 | memset (&outrel, 0, sizeof outrel); | |
1225 | relocate = false; | |
1226 | } | |
1227 | /* h->dynindx may be -1 if the symbol was marked to | |
1228 | become local. */ | |
1229 | else if (h != NULL | |
1230 | && ((! info->symbolic && h->dynindx != -1) | |
1231 | || (h->elf_link_hash_flags | |
1232 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1233 | { | |
1234 | BFD_ASSERT (h->dynindx != -1); | |
1235 | relocate = false; | |
1236 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); | |
1237 | outrel.r_addend = relocation + rel->r_addend; | |
1238 | } | |
1239 | else | |
1240 | { | |
1241 | if (r_type == R_CRIS_32) | |
1242 | { | |
1243 | relocate = true; | |
1244 | outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); | |
1245 | outrel.r_addend = relocation + rel->r_addend; | |
1246 | } | |
1247 | else | |
1248 | { | |
1249 | long indx; | |
1250 | ||
1251 | if (h == NULL) | |
1252 | sec = local_sections[r_symndx]; | |
1253 | else | |
1254 | { | |
1255 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
1256 | || (h->root.type | |
1257 | == bfd_link_hash_defweak)); | |
1258 | sec = h->root.u.def.section; | |
1259 | } | |
1260 | if (sec != NULL && bfd_is_abs_section (sec)) | |
1261 | indx = 0; | |
1262 | else if (sec == NULL || sec->owner == NULL) | |
1263 | { | |
1264 | bfd_set_error (bfd_error_bad_value); | |
1265 | return false; | |
1266 | } | |
1267 | else | |
1268 | { | |
1269 | asection *osec; | |
1270 | ||
1271 | osec = sec->output_section; | |
1272 | indx = elf_section_data (osec)->dynindx; | |
1273 | BFD_ASSERT (indx > 0); | |
1274 | } | |
1275 | ||
1276 | relocate = false; | |
1277 | outrel.r_info = ELF32_R_INFO (indx, r_type); | |
1278 | outrel.r_addend = relocation + rel->r_addend; | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1283 | (((Elf32_External_Rela *) | |
1284 | sreloc->contents) | |
1285 | + sreloc->reloc_count)); | |
1286 | ++sreloc->reloc_count; | |
1287 | ||
1288 | /* This reloc will be computed at runtime, so there's no | |
1289 | need to do anything now, except for R_CRIS_32 relocations | |
1290 | that have been turned into R_CRIS_RELATIVE. */ | |
1291 | if (!relocate) | |
1292 | continue; | |
1293 | } | |
1294 | ||
1295 | break; | |
1296 | } | |
1297 | ||
1298 | r = cris_final_link_relocate (howto, input_bfd, input_section, | |
1299 | contents, rel, relocation); | |
1300 | ||
1301 | if (r != bfd_reloc_ok) | |
1302 | { | |
1303 | const char * msg = (const char *) NULL; | |
1304 | ||
1305 | switch (r) | |
1306 | { | |
1307 | case bfd_reloc_overflow: | |
1308 | r = info->callbacks->reloc_overflow | |
1309 | (info, name, howto->name, (bfd_vma) 0, | |
1310 | input_bfd, input_section, rel->r_offset); | |
1311 | break; | |
1312 | ||
1313 | case bfd_reloc_undefined: | |
1314 | r = info->callbacks->undefined_symbol | |
1315 | (info, name, input_bfd, input_section, rel->r_offset, | |
1316 | true); | |
1317 | break; | |
1318 | ||
1319 | case bfd_reloc_outofrange: | |
1320 | msg = _("internal error: out of range error"); | |
1321 | break; | |
1322 | ||
1323 | case bfd_reloc_notsupported: | |
1324 | msg = _("internal error: unsupported relocation error"); | |
1325 | break; | |
1326 | ||
1327 | case bfd_reloc_dangerous: | |
1328 | msg = _("internal error: dangerous relocation"); | |
1329 | break; | |
1330 | ||
1331 | default: | |
1332 | msg = _("internal error: unknown error"); | |
1333 | break; | |
1334 | } | |
1335 | ||
1336 | if (msg) | |
1337 | r = info->callbacks->warning | |
1338 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
1339 | ||
1340 | if (! r) | |
1341 | return false; | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | return true; | |
1346 | } | |
1347 | \f | |
1348 | /* Finish up dynamic symbol handling. We set the contents of various | |
1349 | dynamic sections here. */ | |
1350 | ||
1351 | static boolean | |
1352 | elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1353 | bfd *output_bfd; | |
1354 | struct bfd_link_info *info; | |
1355 | struct elf_link_hash_entry *h; | |
1356 | Elf_Internal_Sym *sym; | |
1357 | { | |
1358 | bfd *dynobj; | |
1359 | int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; | |
1360 | ||
1361 | dynobj = elf_hash_table (info)->dynobj; | |
1362 | ||
1363 | if (h->plt.offset != (bfd_vma) -1) | |
1364 | { | |
1365 | asection *splt; | |
1366 | asection *sgotplt; | |
1367 | asection *sgot; | |
1368 | asection *srela; | |
1369 | bfd_vma got_base; | |
1370 | ||
1371 | bfd_vma gotplt_offset | |
1372 | = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; | |
1373 | Elf_Internal_Rela rela; | |
1374 | boolean has_gotplt = gotplt_offset != 0; | |
1375 | ||
1376 | /* Get the index in the procedure linkage table which | |
1377 | corresponds to this symbol. This is the index of this symbol | |
1378 | in all the symbols for which we are making plt entries. The | |
1379 | first entry in the procedure linkage table is reserved. */ | |
1380 | /* We have to count backwards here, and the result is only valid as | |
1381 | an index into .got.plt and its relocations. FIXME: Constants... */ | |
1382 | bfd_vma gotplt_index = gotplt_offset/4 - 3; | |
1383 | ||
1384 | /* Get the offset into the .got table of the entry that corresponds | |
1385 | to this function. Note that we embed knowledge that "incoming" | |
1386 | .got goes after .got.plt in the output without padding (pointer | |
1387 | aligned). However, that knowledge is present in several other | |
1388 | places too, here and in elflink.h at least. */ | |
1389 | bfd_vma got_offset | |
1390 | = (has_gotplt | |
1391 | ? gotplt_offset | |
1392 | : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry); | |
1393 | ||
1394 | /* This symbol has an entry in the procedure linkage table. Set it | |
1395 | up. */ | |
1396 | ||
1397 | BFD_ASSERT (h->dynindx != -1); | |
1398 | ||
1399 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1400 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1401 | sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1402 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
1403 | BFD_ASSERT (splt != NULL && sgotplt != NULL | |
1404 | && (! has_gotplt || srela != NULL)); | |
1405 | ||
1406 | got_base = sgotplt->output_section->vma + sgotplt->output_offset; | |
1407 | ||
1408 | /* Fill in the entry in the procedure linkage table. */ | |
1409 | if (! info->shared) | |
1410 | { | |
1411 | memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry, | |
1412 | PLT_ENTRY_SIZE); | |
1413 | ||
1414 | /* We need to enter the absolute address of the GOT entry here. */ | |
1415 | bfd_put_32 (output_bfd, got_base + got_offset, | |
1416 | splt->contents + h->plt.offset + plt_off1); | |
1417 | } | |
1418 | else | |
1419 | { | |
1420 | memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry, | |
1421 | PLT_ENTRY_SIZE); | |
1422 | bfd_put_32 (output_bfd, got_offset, | |
1423 | splt->contents + h->plt.offset + plt_off1); | |
1424 | } | |
1425 | ||
1426 | /* Fill in the plt entry and make a relocation, if this is a "real" | |
1427 | PLT entry. */ | |
1428 | if (has_gotplt) | |
1429 | { | |
1430 | /* Fill in the offset into the reloc table. */ | |
1431 | bfd_put_32 (output_bfd, | |
1432 | gotplt_index * sizeof (Elf32_External_Rela), | |
1433 | splt->contents + h->plt.offset + plt_off2); | |
1434 | ||
1435 | /* Fill in the offset to the first PLT entry, where to "jump". */ | |
1436 | bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4), | |
1437 | splt->contents + h->plt.offset + plt_off3); | |
1438 | ||
1439 | /* Fill in the entry in the global offset table with the address of | |
1440 | the relocating stub. */ | |
1441 | bfd_put_32 (output_bfd, | |
1442 | (splt->output_section->vma | |
1443 | + splt->output_offset | |
1444 | + h->plt.offset | |
1445 | + 8), | |
1446 | sgotplt->contents + got_offset); | |
1447 | ||
1448 | /* Fill in the entry in the .rela.plt section. */ | |
1449 | rela.r_offset = (sgotplt->output_section->vma | |
1450 | + sgotplt->output_offset | |
1451 | + got_offset); | |
1452 | rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT); | |
1453 | rela.r_addend = 0; | |
1454 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1455 | ((Elf32_External_Rela *) srela->contents | |
1456 | + gotplt_index)); | |
1457 | } | |
1458 | ||
1459 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1460 | { | |
1461 | /* Mark the symbol as undefined, rather than as defined in | |
1462 | the .plt section. Leave the value alone. */ | |
1463 | sym->st_shndx = SHN_UNDEF; | |
1464 | ||
1465 | /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't | |
1466 | know whether resetting the value is significant; if it really | |
1467 | is, rather than a quirk or bug in the sparc port, then I | |
1468 | believe we'd see this elsewhere. */ | |
1469 | /* If the symbol is weak, we do need to clear the value. | |
1470 | Otherwise, the PLT entry would provide a definition for | |
1471 | the symbol even if the symbol wasn't defined anywhere, | |
1472 | and so the symbol would never be NULL. */ | |
1473 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) | |
1474 | == 0) | |
1475 | sym->st_value = 0; | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | if (h->got.offset != (bfd_vma) -1) | |
1480 | { | |
1481 | asection *sgot; | |
1482 | asection *srela; | |
1483 | Elf_Internal_Rela rela; | |
1484 | ||
1485 | /* This symbol has an entry in the global offset table. Set it up. */ | |
1486 | ||
1487 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1488 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1489 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
1490 | ||
1491 | rela.r_offset = (sgot->output_section->vma | |
1492 | + sgot->output_offset | |
1493 | + (h->got.offset &~ 1)); | |
1494 | ||
1495 | /* If this is a static link, or it is a -Bsymbolic link and the | |
1496 | symbol is defined locally or was forced to be local because | |
1497 | of a version file, we just want to emit a RELATIVE reloc. | |
1498 | The entry in the global offset table will already have been | |
1499 | initialized in the relocate_section function. */ | |
1500 | if (! elf_hash_table (info)->dynamic_sections_created | |
1501 | || (info->shared | |
1502 | && (info->symbolic || h->dynindx == -1) | |
1503 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1504 | { | |
1505 | rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); | |
1506 | rela.r_addend = bfd_get_signed_32 (output_bfd, | |
1507 | (sgot->contents | |
1508 | + (h->got.offset & ~1))); | |
1509 | } | |
1510 | else | |
1511 | { | |
1512 | bfd_put_32 (output_bfd, (bfd_vma) 0, | |
1513 | sgot->contents + (h->got.offset & ~1)); | |
1514 | rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); | |
1515 | rela.r_addend = 0; | |
1516 | } | |
1517 | ||
1518 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1519 | ((Elf32_External_Rela *) srela->contents | |
1520 | + srela->reloc_count)); | |
1521 | ++srela->reloc_count; | |
1522 | } | |
1523 | ||
1524 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1525 | { | |
1526 | asection *s; | |
1527 | Elf_Internal_Rela rela; | |
1528 | ||
1529 | /* This symbol needs a copy reloc. Set it up. */ | |
1530 | ||
1531 | BFD_ASSERT (h->dynindx != -1 | |
1532 | && (h->root.type == bfd_link_hash_defined | |
1533 | || h->root.type == bfd_link_hash_defweak)); | |
1534 | ||
1535 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1536 | ".rela.bss"); | |
1537 | BFD_ASSERT (s != NULL); | |
1538 | ||
1539 | rela.r_offset = (h->root.u.def.value | |
1540 | + h->root.u.def.section->output_section->vma | |
1541 | + h->root.u.def.section->output_offset); | |
1542 | rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY); | |
1543 | rela.r_addend = 0; | |
1544 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1545 | ((Elf32_External_Rela *) s->contents | |
1546 | + s->reloc_count)); | |
1547 | ++s->reloc_count; | |
1548 | } | |
1549 | ||
1550 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
1551 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1552 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1553 | sym->st_shndx = SHN_ABS; | |
1554 | ||
1555 | return true; | |
1556 | } | |
1557 | \f | |
1558 | /* Finish up the dynamic sections. */ | |
1559 | ||
1560 | static boolean | |
1561 | elf_cris_finish_dynamic_sections (output_bfd, info) | |
1562 | bfd *output_bfd; | |
1563 | struct bfd_link_info *info; | |
1564 | { | |
1565 | bfd *dynobj; | |
1566 | asection *sgot; | |
1567 | asection *sdyn; | |
1568 | ||
1569 | dynobj = elf_hash_table (info)->dynobj; | |
1570 | ||
1571 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1572 | BFD_ASSERT (sgot != NULL); | |
1573 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1574 | ||
1575 | if (elf_hash_table (info)->dynamic_sections_created) | |
1576 | { | |
1577 | asection *splt; | |
1578 | Elf32_External_Dyn *dyncon, *dynconend; | |
1579 | ||
1580 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1581 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
1582 | ||
1583 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
1584 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1585 | for (; dyncon < dynconend; dyncon++) | |
1586 | { | |
1587 | Elf_Internal_Dyn dyn; | |
1588 | asection *s; | |
1589 | ||
1590 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
1591 | ||
1592 | switch (dyn.d_tag) | |
1593 | { | |
1594 | default: | |
1595 | break; | |
1596 | ||
1597 | case DT_PLTGOT: | |
1598 | s = bfd_get_section_by_name (output_bfd, ".got"); | |
1599 | BFD_ASSERT (s != NULL); | |
1600 | dyn.d_un.d_ptr = s->vma; | |
1601 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1602 | break; | |
1603 | ||
1604 | case DT_JMPREL: | |
1605 | /* Yes, we *can* have a .plt and no .plt.rela, for instance | |
1606 | if all symbols are found in the .got (not .got.plt). */ | |
1607 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1608 | dyn.d_un.d_ptr = s != NULL ? s->vma : 0; | |
1609 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1610 | break; | |
1611 | ||
1612 | case DT_PLTRELSZ: | |
1613 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1614 | if (s == NULL) | |
1615 | dyn.d_un.d_val = 0; | |
1616 | else if (s->_cooked_size != 0) | |
1617 | dyn.d_un.d_val = s->_cooked_size; | |
1618 | else | |
1619 | dyn.d_un.d_val = s->_raw_size; | |
1620 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1621 | break; | |
1622 | ||
1623 | case DT_RELASZ: | |
1624 | /* The procedure linkage table relocs (DT_JMPREL) should | |
1625 | not be included in the overall relocs (DT_RELA). | |
1626 | Therefore, we override the DT_RELASZ entry here to | |
1627 | make it not include the JMPREL relocs. Since the | |
1628 | linker script arranges for .rela.plt to follow all | |
1629 | other relocation sections, we don't have to worry | |
1630 | about changing the DT_RELA entry. */ | |
1631 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1632 | if (s != NULL) | |
1633 | { | |
1634 | if (s->_cooked_size != 0) | |
1635 | dyn.d_un.d_val -= s->_cooked_size; | |
1636 | else | |
1637 | dyn.d_un.d_val -= s->_raw_size; | |
1638 | } | |
1639 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1640 | break; | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | /* Fill in the first entry in the procedure linkage table. */ | |
1645 | if (splt->_raw_size > 0) | |
1646 | { | |
1647 | if (info->shared) | |
1648 | memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE); | |
1649 | else | |
1650 | { | |
1651 | memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE); | |
1652 | bfd_put_32 (output_bfd, | |
1653 | sgot->output_section->vma + sgot->output_offset + 4, | |
1654 | splt->contents + 6); | |
1655 | bfd_put_32 (output_bfd, | |
1656 | sgot->output_section->vma + sgot->output_offset + 8, | |
1657 | splt->contents + 14); | |
1658 | ||
1659 | elf_section_data (splt->output_section)->this_hdr.sh_entsize | |
1660 | = PLT_ENTRY_SIZE; | |
1661 | } | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | /* Fill in the first three entries in the global offset table. */ | |
1666 | if (sgot->_raw_size > 0) | |
1667 | { | |
1668 | if (sdyn == NULL) | |
1669 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
1670 | else | |
1671 | bfd_put_32 (output_bfd, | |
1672 | sdyn->output_section->vma + sdyn->output_offset, | |
1673 | sgot->contents); | |
1674 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
1675 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
1676 | } | |
1677 | ||
1678 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
1679 | ||
1680 | return true; | |
06c15ad7 HPN |
1681 | } |
1682 | \f | |
1683 | /* Return the section that should be marked against GC for a given | |
1684 | relocation. */ | |
1685 | ||
1686 | static asection * | |
1687 | cris_elf_gc_mark_hook (abfd, info, rel, h, sym) | |
1688 | bfd * abfd; | |
1689 | struct bfd_link_info * info ATTRIBUTE_UNUSED; | |
1690 | Elf_Internal_Rela * rel; | |
1691 | struct elf_link_hash_entry * h; | |
1692 | Elf_Internal_Sym * sym; | |
1693 | { | |
1694 | if (h != NULL) | |
1695 | { | |
1696 | switch (ELF32_R_TYPE (rel->r_info)) | |
1697 | { | |
1698 | case R_CRIS_GNU_VTINHERIT: | |
1699 | case R_CRIS_GNU_VTENTRY: | |
1700 | break; | |
1701 | ||
1702 | default: | |
1703 | switch (h->root.type) | |
1704 | { | |
1705 | case bfd_link_hash_defined: | |
1706 | case bfd_link_hash_defweak: | |
1707 | return h->root.u.def.section; | |
1708 | ||
1709 | case bfd_link_hash_common: | |
1710 | return h->root.u.c.p->section; | |
1711 | ||
1712 | default: | |
1713 | break; | |
1714 | } | |
1715 | } | |
1716 | } | |
1717 | else | |
1718 | { | |
1719 | if (!(elf_bad_symtab (abfd) | |
1720 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
1721 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
1722 | && sym->st_shndx != SHN_COMMON)) | |
1723 | { | |
1724 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | return NULL; | |
1729 | } | |
1730 | ||
1731 | /* Update the got entry reference counts for the section being removed. */ | |
1732 | ||
1733 | static boolean | |
1734 | cris_elf_gc_sweep_hook (abfd, info, sec, relocs) | |
1735 | bfd * abfd ATTRIBUTE_UNUSED; | |
1736 | struct bfd_link_info * info ATTRIBUTE_UNUSED; | |
1737 | asection * sec ATTRIBUTE_UNUSED; | |
1738 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; | |
1739 | { | |
915e5146 HPN |
1740 | Elf_Internal_Shdr *symtab_hdr; |
1741 | struct elf_link_hash_entry **sym_hashes; | |
1742 | bfd_signed_vma *local_got_refcounts; | |
1743 | const Elf_Internal_Rela *rel, *relend; | |
1744 | unsigned long r_symndx; | |
1745 | struct elf_link_hash_entry *h; | |
1746 | bfd *dynobj; | |
1747 | asection *sgot; | |
1748 | asection *srelgot; | |
1749 | ||
1750 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1751 | sym_hashes = elf_sym_hashes (abfd); | |
1752 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
1753 | ||
1754 | dynobj = elf_hash_table (info)->dynobj; | |
1755 | if (dynobj == NULL) | |
1756 | return true; | |
1757 | ||
1758 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1759 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1760 | ||
1761 | relend = relocs + sec->reloc_count; | |
1762 | for (rel = relocs; rel < relend; rel++) | |
1763 | { | |
1764 | switch (ELF32_R_TYPE (rel->r_info)) | |
1765 | { | |
1766 | case R_CRIS_16_GOT: | |
1767 | case R_CRIS_32_GOT: | |
1768 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1769 | if (r_symndx >= symtab_hdr->sh_info) | |
1770 | { | |
1771 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1772 | if (h->got.refcount > 0) | |
1773 | { | |
1774 | --h->got.refcount; | |
1775 | if (h->got.refcount == 0) | |
1776 | { | |
1777 | /* We don't need the .got entry any more. */ | |
1778 | sgot->_raw_size -= 4; | |
1779 | srelgot->_raw_size -= sizeof (Elf32_External_Rela); | |
1780 | } | |
1781 | } | |
1782 | break; | |
1783 | } | |
1784 | ||
1785 | local_got_reloc: | |
1786 | if (local_got_refcounts != NULL) | |
1787 | { | |
1788 | if (local_got_refcounts[r_symndx] > 0) | |
1789 | { | |
1790 | --local_got_refcounts[r_symndx]; | |
1791 | if (local_got_refcounts[r_symndx] == 0) | |
1792 | { | |
1793 | /* We don't need the .got entry any more. */ | |
1794 | sgot->_raw_size -= 4; | |
1795 | if (info->shared) | |
1796 | srelgot->_raw_size -= sizeof (Elf32_External_Rela); | |
1797 | } | |
1798 | } | |
1799 | } | |
1800 | break; | |
1801 | ||
1802 | case R_CRIS_16_GOTPLT: | |
1803 | case R_CRIS_32_GOTPLT: | |
1804 | /* For local symbols, treat these like GOT relocs. */ | |
1805 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1806 | if (r_symndx < symtab_hdr->sh_info) | |
1807 | goto local_got_reloc; | |
1808 | ||
1809 | case R_CRIS_32_PLT_GOTREL: | |
1810 | /* FIXME: We don't garbage-collect away the .got section. */ | |
1811 | if (local_got_refcounts != NULL) | |
1812 | local_got_refcounts[-1]--; | |
1813 | /* Fall through. */ | |
1814 | ||
1815 | case R_CRIS_8_PCREL: | |
1816 | case R_CRIS_16_PCREL: | |
1817 | case R_CRIS_32_PCREL: | |
1818 | case R_CRIS_32_PLT_PCREL: | |
1819 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1820 | if (r_symndx >= symtab_hdr->sh_info) | |
1821 | { | |
1822 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1823 | if (h->plt.refcount > 0) | |
1824 | --h->plt.refcount; | |
1825 | } | |
1826 | break; | |
1827 | ||
1828 | default: | |
1829 | break; | |
1830 | } | |
1831 | } | |
1832 | ||
06c15ad7 HPN |
1833 | return true; |
1834 | } | |
1835 | ||
915e5146 HPN |
1836 | /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT |
1837 | entry but we found we will not create any. Called when we find we will | |
1838 | not have any PLT for this symbol, by elf_cris_adjust_dynamic_symbol | |
1839 | when we're doing a proper dynamic link, or | |
1840 | elf_cris_size_dynamic_sections if no dynamic sections will be created | |
1841 | (we're only linking static objects). */ | |
1842 | ||
1843 | static boolean | |
1844 | elf_cris_adjust_gotplt_to_got (h, p) | |
1845 | struct elf_cris_link_hash_entry *h; | |
1846 | PTR p; | |
1847 | { | |
1848 | struct bfd_link_info *info = (struct bfd_link_info *) p; | |
1849 | bfd *dynobj = elf_hash_table (info)->dynobj; | |
1850 | ||
1851 | BFD_ASSERT (dynobj != NULL); | |
1852 | ||
1853 | /* If nobody wanted a GOTPLT with this symbol, we're done. */ | |
1854 | if (h->gotplt_refcount <= 0) | |
1855 | return true; | |
1856 | ||
1857 | if (h->root.got.refcount > 0) | |
1858 | { | |
1859 | /* There's a GOT entry for this symbol. Just adjust the refcount. | |
1860 | Probably not necessary at this stage, but keeping it accurate | |
1861 | helps avoiding surprises later. */ | |
1862 | h->root.got.refcount += h->gotplt_refcount; | |
1863 | h->gotplt_refcount = -1; | |
1864 | } | |
1865 | else | |
1866 | { | |
1867 | /* No GOT entry for this symbol. We need to create one. | |
1868 | FIXME: This should be a *local* got, not a global one. | |
1869 | Seriously. */ | |
1870 | asection *sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1871 | asection *srelgot | |
1872 | = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1873 | ||
1874 | /* Put an accurate refcount there. */ | |
1875 | h->root.got.refcount = h->gotplt_refcount; | |
1876 | ||
1877 | h->gotplt_refcount = -1; | |
1878 | ||
1879 | /* We always have a .got section when there are dynamic | |
1880 | relocs. */ | |
1881 | BFD_ASSERT (sgot != NULL /* Surely have .got section. */); | |
1882 | ||
1883 | /* We might have had a PLT but with no GOT entry and | |
1884 | further no GOT reloc section at all needed before. | |
1885 | Add it. */ | |
1886 | if (srelgot == NULL) | |
1887 | { | |
1888 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
1889 | ||
1890 | if (srelgot == NULL | |
1891 | || !bfd_set_section_flags (dynobj, srelgot, | |
1892 | (SEC_ALLOC | |
1893 | | SEC_LOAD | |
1894 | | SEC_HAS_CONTENTS | |
1895 | | SEC_IN_MEMORY | |
1896 | | SEC_LINKER_CREATED | |
1897 | | SEC_READONLY)) | |
1898 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) | |
1899 | return false; | |
1900 | } | |
1901 | ||
1902 | /* Allocate space in the .got section. */ | |
1903 | sgot->_raw_size += 4; | |
1904 | ||
1905 | /* Allocate relocation space. */ | |
1906 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
1907 | } | |
1908 | ||
1909 | return true; | |
1910 | } | |
1911 | ||
1912 | /* Try to fold PLT entries with GOT entries. There are two cases when we | |
1913 | want to do this: | |
1914 | ||
1915 | - When all PLT references are GOTPLT references, and there are GOT | |
1916 | references. We don't have to generate a PLT at all. | |
1917 | ||
1918 | - When there are both (ordinary) PLT references and GOT references. | |
1919 | We want to make the PLT reference use the ordinary GOT entry rather | |
1920 | than a run-time dynamically resolved GOTPLT entry (since the GOT | |
1921 | entry will have to be resolved at startup anyway). | |
1922 | ||
1923 | Though the latter case is handled when room for the PLT is allocated, | |
1924 | not here. | |
1925 | ||
1926 | Note that this function is called before symbols are forced local by | |
1927 | version scripts. The differing cases are handled by | |
1928 | elf_cris_hide_symbol. */ | |
1929 | ||
1930 | static boolean | |
1931 | elf_cris_try_fold_plt_to_got (h, p) | |
1932 | struct elf_cris_link_hash_entry *h; | |
1933 | PTR p; | |
1934 | { | |
1935 | struct bfd_link_info *info = (struct bfd_link_info *) p; | |
1936 | ||
1937 | /* If there are no GOT references for this symbol, we can't fold any | |
1938 | other reference so there's nothing to do. Likewise if there are no | |
1939 | PLT references; GOTPLT references included. */ | |
1940 | if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0) | |
1941 | return true; | |
1942 | ||
1943 | /* GOTPLT relocs are supposed to be included into the PLT refcount. */ | |
1944 | BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount); | |
1945 | ||
1946 | if (h->gotplt_refcount == h->root.plt.refcount) | |
1947 | { | |
1948 | /* Th only PLT references are GOTPLT references, and there are GOT | |
1949 | references. Convert PLT to GOT references. */ | |
1950 | if (! elf_cris_adjust_gotplt_to_got (h, info)) | |
1951 | return false; | |
1952 | ||
1953 | /* Clear the PLT references, so no PLT will be created. */ | |
1954 | h->root.plt.offset = (bfd_vma) -1; | |
1955 | } | |
1956 | ||
1957 | return true; | |
1958 | } | |
1959 | ||
1960 | /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc | |
1961 | to use a GOT entry (and create one) rather than requiring a GOTPLT | |
1962 | entry. */ | |
1963 | ||
1964 | static void | |
1965 | elf_cris_hide_symbol (info, h) | |
1966 | struct bfd_link_info *info; | |
1967 | struct elf_link_hash_entry *h; | |
1968 | { | |
1969 | elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); | |
1970 | ||
1971 | _bfd_elf_link_hash_hide_symbol (info, h); | |
1972 | } | |
1973 | ||
1974 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
1975 | regular object. The current definition is in some section of the | |
1976 | dynamic object, but we're not including those sections. We have to | |
1977 | change the definition to something the rest of the link can | |
1978 | understand. */ | |
1979 | ||
1980 | static boolean | |
1981 | elf_cris_adjust_dynamic_symbol (info, h) | |
1982 | struct bfd_link_info *info; | |
1983 | struct elf_link_hash_entry *h; | |
1984 | { | |
1985 | bfd *dynobj; | |
1986 | asection *s; | |
1987 | unsigned int power_of_two; | |
1988 | ||
1989 | dynobj = elf_hash_table (info)->dynobj; | |
1990 | ||
1991 | /* Make sure we know what is going on here. */ | |
1992 | BFD_ASSERT (dynobj != NULL | |
1993 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
1994 | || h->weakdef != NULL | |
1995 | || ((h->elf_link_hash_flags | |
1996 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1997 | && (h->elf_link_hash_flags | |
1998 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
1999 | && (h->elf_link_hash_flags | |
2000 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2001 | ||
2002 | /* If this is a function, put it in the procedure linkage table. We | |
2003 | will fill in the contents of the procedure linkage table later, | |
2004 | when we know the address of the .got section. */ | |
2005 | if (h->type == STT_FUNC | |
2006 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2007 | { | |
2008 | if (! info->shared | |
2009 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2010 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 | |
2011 | /* We must always create the plt entry if it was referenced by a | |
2012 | PLT relocation. In this case we already recorded it as a | |
2013 | dynamic symbol. */ | |
2014 | /* FIXME: m68k and i386 differ here, for unclear reasons. */ | |
2015 | && h->dynindx == -1) | |
2016 | { | |
2017 | /* This case can occur if we saw a PLT reloc in an input file, | |
2018 | but the symbol was never referred to by a dynamic object. In | |
2019 | such a case, we don't actually need to build a procedure | |
2020 | linkage table, and we can just do a PC reloc instead. */ | |
2021 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2022 | h->plt.offset = (bfd_vma) -1; | |
2023 | ||
2024 | return | |
2025 | elf_cris_adjust_gotplt_to_got ((struct | |
2026 | elf_cris_link_hash_entry *) h, | |
2027 | info); | |
2028 | } | |
2029 | ||
2030 | /* If there are only GOT references and GOTPLT references to this | |
2031 | PLT entry, get rid of the PLT. */ | |
2032 | if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *) | |
2033 | h, info)) | |
2034 | return false; | |
2035 | ||
2036 | /* GC or folding may have rendered this entry unused. */ | |
2037 | if (h->plt.refcount <= 0) | |
2038 | { | |
2039 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
2040 | h->plt.offset = (bfd_vma) -1; | |
2041 | return true; | |
2042 | } | |
2043 | ||
2044 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2045 | if (h->dynindx == -1) | |
2046 | { | |
2047 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2048 | return false; | |
2049 | } | |
2050 | ||
2051 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2052 | BFD_ASSERT (s != NULL); | |
2053 | ||
2054 | /* If this is the first .plt entry, make room for the special | |
2055 | first entry. */ | |
2056 | if (s->_raw_size == 0) | |
2057 | s->_raw_size += PLT_ENTRY_SIZE; | |
2058 | ||
2059 | /* If this symbol is not defined in a regular file, and we are | |
2060 | not generating a shared library, then set the symbol to this | |
2061 | location in the .plt. This is required to make function | |
2062 | pointers compare as equal between the normal executable and | |
2063 | the shared library. */ | |
2064 | if (!info->shared | |
2065 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2066 | { | |
2067 | h->root.u.def.section = s; | |
2068 | h->root.u.def.value = s->_raw_size; | |
2069 | } | |
2070 | ||
2071 | /* If there's already a GOT entry, use that, not a .got.plt. The | |
2072 | GOT fields still have a reference count when we get here; it's | |
2073 | not yet changed to offsets. */ | |
2074 | if (h->got.refcount > 0) | |
2075 | { | |
2076 | h->got.refcount += h->plt.refcount; | |
2077 | ||
2078 | /* Mark the PLT offset to use the GOT entry by setting the low | |
2079 | bit in the plt offset; it is always a multiple of | |
2080 | pointer-size. */ | |
2081 | BFD_ASSERT ((s->_raw_size & 3) == 0); | |
2082 | ||
2083 | /* Change the PLT refcount to an offset. */ | |
2084 | h->plt.offset = s->_raw_size; | |
2085 | ||
2086 | /* By not setting gotplt_offset (i.e. it remains at 0), we signal | |
2087 | that the got entry should be used instead. */ | |
2088 | BFD_ASSERT (((struct elf_cris_link_hash_entry *) | |
2089 | h)->gotplt_offset == 0); | |
2090 | ||
2091 | /* Make room for this entry. */ | |
2092 | s->_raw_size += PLT_ENTRY_SIZE; | |
2093 | ||
2094 | return true; | |
2095 | } | |
2096 | ||
2097 | /* No GOT reference for this symbol; prepare for an ordinary PLT. */ | |
2098 | h->plt.offset = s->_raw_size; | |
2099 | ||
2100 | /* Make room for this entry. */ | |
2101 | s->_raw_size += PLT_ENTRY_SIZE; | |
2102 | ||
2103 | /* We also need to make an entry in the .got.plt section, which | |
2104 | will be placed in the .got section by the linker script. */ | |
2105 | ((struct elf_cris_link_hash_entry *) h)->gotplt_offset | |
2106 | = elf_cris_hash_table (info)->next_gotplt_entry; | |
2107 | elf_cris_hash_table (info)->next_gotplt_entry += 4; | |
2108 | ||
2109 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2110 | BFD_ASSERT (s != NULL); | |
2111 | s->_raw_size += 4; | |
2112 | ||
2113 | /* We also need to make an entry in the .rela.plt section. */ | |
2114 | ||
2115 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
2116 | BFD_ASSERT (s != NULL); | |
2117 | s->_raw_size += sizeof (Elf32_External_Rela); | |
2118 | ||
2119 | return true; | |
2120 | } | |
2121 | ||
2122 | /* Reinitialize the plt offset now that it is not used as a reference | |
2123 | count any more. */ | |
2124 | h->plt.offset = (bfd_vma) -1; | |
2125 | ||
2126 | /* If this is a weak symbol, and there is a real definition, the | |
2127 | processor independent code will have arranged for us to see the | |
2128 | real definition first, and we can just use the same value. */ | |
2129 | if (h->weakdef != NULL) | |
2130 | { | |
2131 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2132 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2133 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2134 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2135 | return true; | |
2136 | } | |
2137 | ||
2138 | /* This is a reference to a symbol defined by a dynamic object which | |
2139 | is not a function. */ | |
2140 | ||
2141 | /* If we are creating a shared library, we must presume that the | |
2142 | only references to the symbol are via the global offset table. | |
2143 | For such cases we need not do anything here; the relocations will | |
2144 | be handled correctly by relocate_section. */ | |
2145 | if (info->shared) | |
2146 | return true; | |
2147 | ||
2148 | /* If there are no references to this symbol that do not use the | |
2149 | GOT, we don't need to generate a copy reloc. */ | |
2150 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
2151 | return true; | |
2152 | ||
2153 | /* We must allocate the symbol in our .dynbss section, which will | |
2154 | become part of the .bss section of the executable. There will be | |
2155 | an entry for this symbol in the .dynsym section. The dynamic | |
2156 | object will contain position independent code, so all references | |
2157 | from the dynamic object to this symbol will go through the global | |
2158 | offset table. The dynamic linker will use the .dynsym entry to | |
2159 | determine the address it must put in the global offset table, so | |
2160 | both the dynamic object and the regular object will refer to the | |
2161 | same memory location for the variable. */ | |
2162 | ||
2163 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
2164 | BFD_ASSERT (s != NULL); | |
2165 | ||
2166 | /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to | |
2167 | copy the initial value out of the dynamic object and into the | |
2168 | runtime process image. We need to remember the offset into the | |
2169 | .rela.bss section we are going to use. */ | |
2170 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2171 | { | |
2172 | asection *srel; | |
2173 | ||
2174 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
2175 | BFD_ASSERT (srel != NULL); | |
2176 | srel->_raw_size += sizeof (Elf32_External_Rela); | |
2177 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2178 | } | |
2179 | ||
2180 | /* Historic precedent: m68k and i386 allow max 8-byte alignment for the | |
2181 | thing to copy; so do we. */ | |
2182 | ||
2183 | /* We need to figure out the alignment required for this symbol. I | |
2184 | have no idea how ELF linkers handle this. */ | |
2185 | power_of_two = bfd_log2 (h->size); | |
2186 | if (power_of_two > 3) | |
2187 | power_of_two = 3; | |
2188 | ||
2189 | /* Apply the required alignment. */ | |
2190 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2191 | (bfd_size_type) (1 << power_of_two)); | |
2192 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2193 | { | |
2194 | if (!bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2195 | return false; | |
2196 | } | |
2197 | ||
2198 | /* Define the symbol as being at this point in the section. */ | |
2199 | h->root.u.def.section = s; | |
2200 | h->root.u.def.value = s->_raw_size; | |
2201 | ||
2202 | /* Increment the section size to make room for the symbol. */ | |
2203 | s->_raw_size += h->size; | |
2204 | ||
2205 | return true; | |
2206 | } | |
2207 | ||
2208 | /* Look through the relocs for a section during the first phase. */ | |
a7c10850 | 2209 | |
06c15ad7 HPN |
2210 | static boolean |
2211 | cris_elf_check_relocs (abfd, info, sec, relocs) | |
2212 | bfd *abfd; | |
2213 | struct bfd_link_info *info; | |
2214 | asection *sec; | |
2215 | const Elf_Internal_Rela *relocs; | |
2216 | { | |
915e5146 | 2217 | bfd *dynobj; |
06c15ad7 HPN |
2218 | Elf_Internal_Shdr *symtab_hdr; |
2219 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
915e5146 | 2220 | bfd_signed_vma *local_got_refcounts; |
06c15ad7 HPN |
2221 | const Elf_Internal_Rela *rel; |
2222 | const Elf_Internal_Rela *rel_end; | |
915e5146 HPN |
2223 | asection *sgot; |
2224 | asection *srelgot; | |
2225 | asection *sreloc; | |
a7c10850 | 2226 | |
06c15ad7 HPN |
2227 | if (info->relocateable) |
2228 | return true; | |
a7c10850 | 2229 | |
915e5146 | 2230 | dynobj = elf_hash_table (info)->dynobj; |
06c15ad7 HPN |
2231 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2232 | sym_hashes = elf_sym_hashes (abfd); | |
a7c10850 | 2233 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); |
915e5146 HPN |
2234 | local_got_refcounts = elf_local_got_refcounts (abfd); |
2235 | ||
2236 | sgot = NULL; | |
2237 | srelgot = NULL; | |
2238 | sreloc = NULL; | |
2239 | ||
06c15ad7 HPN |
2240 | if (!elf_bad_symtab (abfd)) |
2241 | sym_hashes_end -= symtab_hdr->sh_info; | |
a7c10850 | 2242 | |
06c15ad7 HPN |
2243 | rel_end = relocs + sec->reloc_count; |
2244 | for (rel = relocs; rel < rel_end; rel++) | |
2245 | { | |
2246 | struct elf_link_hash_entry *h; | |
2247 | unsigned long r_symndx; | |
915e5146 | 2248 | enum elf_cris_reloc_type r_type; |
a7c10850 | 2249 | |
06c15ad7 HPN |
2250 | r_symndx = ELF32_R_SYM (rel->r_info); |
2251 | if (r_symndx < symtab_hdr->sh_info) | |
2252 | h = NULL; | |
2253 | else | |
2254 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
a7c10850 | 2255 | |
915e5146 HPN |
2256 | r_type = ELF32_R_TYPE (rel->r_info); |
2257 | ||
2258 | /* Some relocs require linker-created sections; we need to hang them | |
2259 | on the first input bfd we found that contained dynamic relocs. */ | |
2260 | switch (r_type) | |
2261 | { | |
2262 | case R_CRIS_16_GOT: | |
2263 | case R_CRIS_32_GOT: | |
2264 | case R_CRIS_32_GOTREL: | |
2265 | case R_CRIS_32_PLT_GOTREL: | |
2266 | case R_CRIS_32_PLT_PCREL: | |
2267 | case R_CRIS_16_GOTPLT: | |
2268 | case R_CRIS_32_GOTPLT: | |
2269 | if (dynobj == NULL) | |
2270 | { | |
2271 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2272 | ||
2273 | /* Create the .got section, so we can assume it's always | |
2274 | present whenever there's a dynobj. */ | |
2275 | if (!_bfd_elf_create_got_section (dynobj, info)) | |
2276 | return false; | |
2277 | } | |
2278 | break; | |
2279 | ||
2280 | default: | |
2281 | break; | |
2282 | } | |
2283 | ||
2284 | /* Some relocs require a global offset table (but perhaps not a | |
2285 | specific GOT entry). */ | |
2286 | switch (ELF32_R_TYPE (rel->r_info)) | |
2287 | { | |
2288 | case R_CRIS_16_GOT: | |
2289 | case R_CRIS_32_GOT: | |
2290 | case R_CRIS_32_GOTREL: | |
2291 | case R_CRIS_32_PLT_GOTREL: | |
2292 | if (sgot == NULL) | |
2293 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2294 | ||
2295 | if (local_got_refcounts == NULL) | |
2296 | { | |
2297 | size_t size; | |
2298 | ||
2299 | /* We use index local_got_refcounts[-1] to count all | |
2300 | GOT-relative relocations that do not have explicit | |
2301 | GOT entries. */ | |
2302 | size = (symtab_hdr->sh_info + 1) * sizeof (bfd_signed_vma); | |
2303 | local_got_refcounts = ((bfd_signed_vma *) | |
2304 | bfd_alloc (abfd, size)); | |
2305 | if (local_got_refcounts == NULL) | |
2306 | return false; | |
2307 | memset (local_got_refcounts, -1, size); | |
2308 | ||
2309 | local_got_refcounts++; | |
2310 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
2311 | } | |
2312 | break; | |
2313 | ||
2314 | default: | |
2315 | break; | |
2316 | } | |
2317 | ||
06c15ad7 HPN |
2318 | switch (ELF32_R_TYPE (rel->r_info)) |
2319 | { | |
915e5146 HPN |
2320 | case R_CRIS_16_GOTPLT: |
2321 | case R_CRIS_32_GOTPLT: | |
2322 | /* Mark that we need a GOT entry if the PLT entry (and its GOT | |
2323 | entry) is eliminated. We can only do this for a non-local | |
2324 | symbol. */ | |
2325 | if (h != NULL) | |
2326 | { | |
2327 | ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++; | |
2328 | goto handle_gotplt_reloc; | |
2329 | } | |
2330 | /* If h is NULL then this is a local symbol, and we must make a | |
2331 | GOT entry for it, so handle it like a GOT reloc. */ | |
2332 | /* Fall through. */ | |
2333 | ||
2334 | case R_CRIS_16_GOT: | |
2335 | case R_CRIS_32_GOT: | |
2336 | /* This symbol requires a global offset table entry. */ | |
2337 | ||
2338 | if (srelgot == NULL | |
2339 | && (h != NULL || info->shared)) | |
2340 | { | |
2341 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2342 | if (srelgot == NULL) | |
2343 | { | |
2344 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
2345 | if (srelgot == NULL | |
2346 | || !bfd_set_section_flags (dynobj, srelgot, | |
2347 | (SEC_ALLOC | |
2348 | | SEC_LOAD | |
2349 | | SEC_HAS_CONTENTS | |
2350 | | SEC_IN_MEMORY | |
2351 | | SEC_LINKER_CREATED | |
2352 | | SEC_READONLY)) | |
2353 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2354 | return false; | |
2355 | } | |
2356 | } | |
2357 | ||
2358 | if (h != NULL) | |
2359 | { | |
2360 | if (h->got.refcount == -1) | |
2361 | { | |
2362 | h->got.refcount = 1; | |
2363 | ||
2364 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2365 | if (h->dynindx == -1) | |
2366 | { | |
2367 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2368 | return false; | |
2369 | } | |
2370 | ||
2371 | /* Allocate space in the .got section. */ | |
2372 | sgot->_raw_size += 4; | |
2373 | /* Allocate relocation space. */ | |
2374 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
2375 | } | |
2376 | else | |
2377 | h->got.refcount++; | |
2378 | } | |
2379 | else | |
2380 | { | |
2381 | /* This is a global offset table entry for a local symbol. */ | |
2382 | if (local_got_refcounts[r_symndx] == -1) | |
2383 | { | |
2384 | local_got_refcounts[r_symndx] = 1; | |
2385 | ||
2386 | sgot->_raw_size += 4; | |
2387 | if (info->shared) | |
2388 | { | |
2389 | /* If we are generating a shared object, we need to | |
2390 | output a R_CRIS_RELATIVE reloc so that the dynamic | |
2391 | linker can adjust this GOT entry. */ | |
2392 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
2393 | } | |
2394 | } | |
2395 | else | |
2396 | local_got_refcounts[r_symndx]++; | |
2397 | } | |
2398 | break; | |
2399 | ||
2400 | case R_CRIS_32_GOTREL: | |
2401 | /* This reference requires a global offset table. | |
2402 | FIXME: The actual refcount isn't used currently; the .got | |
2403 | section can't be removed if there were any references in the | |
2404 | input. */ | |
2405 | local_got_refcounts[-1]++; | |
2406 | break; | |
2407 | ||
2408 | handle_gotplt_reloc: | |
2409 | ||
2410 | case R_CRIS_32_PLT_GOTREL: | |
2411 | /* This reference requires a global offset table. */ | |
2412 | local_got_refcounts[-1]++; | |
2413 | /* Fall through. */ | |
2414 | ||
2415 | case R_CRIS_32_PLT_PCREL: | |
2416 | /* This symbol requires a procedure linkage table entry. We | |
2417 | actually build the entry in adjust_dynamic_symbol, | |
2418 | because this might be a case of linking PIC code which is | |
2419 | never referenced by a dynamic object, in which case we | |
2420 | don't need to generate a procedure linkage table entry | |
2421 | after all. */ | |
2422 | ||
2423 | /* If this is a local symbol, we resolve it directly without | |
2424 | creating a procedure linkage table entry. */ | |
2425 | if (h == NULL) | |
2426 | continue; | |
2427 | ||
2428 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2429 | if (h->plt.refcount == -1) | |
2430 | h->plt.refcount = 1; | |
2431 | else | |
2432 | h->plt.refcount++; | |
2433 | break; | |
2434 | ||
2435 | case R_CRIS_8: | |
2436 | case R_CRIS_16: | |
2437 | case R_CRIS_32: | |
2438 | /* Let's help debug shared library creation. Any of these | |
2439 | relocs can be used in shared libs, but pages containing them | |
2440 | cannot be shared. Don't warn for sections we don't care | |
2441 | about, such as debug sections or non-constant sections. We | |
2442 | can't help tables of (global) function pointers, for example, | |
2443 | though they must be emitted in a data section to avoid having | |
2444 | impure text sections. */ | |
2445 | if (info->shared | |
2446 | && (sec->flags & SEC_ALLOC) != 0 | |
2447 | && (sec->flags & SEC_READONLY) != 0) | |
2448 | { | |
2449 | /* FIXME: How do we make this optionally a warning only? */ | |
2450 | if (abfd->my_archive) | |
2451 | (*_bfd_error_handler) | |
2452 | (_("%s(%s), section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"), | |
2453 | bfd_get_filename (bfd_my_archive (abfd)), | |
2454 | bfd_get_filename (abfd), | |
2455 | sec->name, | |
2456 | cris_elf_howto_table[ELF32_R_TYPE (rel->r_info)].name); | |
2457 | else | |
2458 | (*_bfd_error_handler) | |
2459 | (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"), | |
2460 | bfd_get_filename (abfd), | |
2461 | sec->name, | |
2462 | cris_elf_howto_table[ELF32_R_TYPE (rel->r_info)].name); | |
2463 | } | |
2464 | /* Fall through. */ | |
2465 | ||
2466 | case R_CRIS_8_PCREL: | |
2467 | case R_CRIS_16_PCREL: | |
2468 | case R_CRIS_32_PCREL: | |
2469 | if (h != NULL) | |
2470 | { | |
2471 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
2472 | ||
2473 | /* Make sure a plt entry is created for this symbol if it | |
2474 | turns out to be a function defined by a dynamic object. */ | |
2475 | if (h->plt.refcount == -1) | |
2476 | h->plt.refcount = 1; | |
2477 | else | |
2478 | h->plt.refcount++; | |
2479 | } | |
2480 | ||
2481 | /* If we are creating a shared library and this is not a local | |
2482 | symbol, we need to copy the reloc into the shared library. | |
2483 | However when linking with -Bsymbolic and this is a global | |
2484 | symbol which is defined in an object we are including in the | |
2485 | link (i.e., DEF_REGULAR is set), then we can resolve the | |
2486 | reloc directly. At this point we have not seen all the input | |
2487 | files, so it is possible that DEF_REGULAR is not set now but | |
2488 | will be set later (it is never cleared). In case of a weak | |
2489 | definition, DEF_REGULAR may be cleared later by a strong | |
2490 | definition in a shared library. We account for that | |
2491 | possibility below by storing information in the relocs_copied | |
2492 | field of the hash table entry. A similar situation occurs | |
2493 | when creating shared libraries and symbol visibility changes | |
2494 | render the symbol local. */ | |
2495 | ||
2496 | /* No need to do anything if we're not creating a shared object. */ | |
2497 | if (! info->shared) | |
2498 | break; | |
2499 | ||
2500 | /* We don't need to handle relocs into sections not going into | |
2501 | the "real" output. */ | |
2502 | if ((sec->flags & SEC_ALLOC) == 0) | |
2503 | break; | |
2504 | ||
2505 | /* We can only eliminate PC-relative relocs. */ | |
2506 | if (r_type == R_CRIS_8_PCREL | |
2507 | || r_type == R_CRIS_16_PCREL | |
2508 | || r_type == R_CRIS_32_PCREL) | |
2509 | { | |
2510 | /* If the symbol is local, then we can eliminate the reloc. */ | |
2511 | if (h == NULL) | |
2512 | break; | |
2513 | ||
2514 | /* If this is with -Bsymbolic and the symbol isn't weak, and | |
2515 | is defined by an ordinary object (the ones we include in | |
2516 | this shared library) then we can also eliminate the | |
2517 | reloc. See comment above for more eliminable cases which | |
2518 | we can't identify at this time. */ | |
2519 | if (info->symbolic | |
2520 | && h->root.type != bfd_link_hash_defweak | |
2521 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
2522 | break; | |
2523 | } | |
2524 | ||
2525 | /* We create a reloc section in dynobj and make room for this | |
2526 | reloc. */ | |
2527 | if (sreloc == NULL) | |
2528 | { | |
2529 | const char *name; | |
2530 | ||
2531 | name = (bfd_elf_string_from_elf_section | |
2532 | (abfd, | |
2533 | elf_elfheader (abfd)->e_shstrndx, | |
2534 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2535 | if (name == NULL) | |
2536 | return false; | |
2537 | ||
2538 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
2539 | && strcmp (bfd_get_section_name (abfd, sec), | |
2540 | name + 5) == 0); | |
2541 | ||
2542 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2543 | if (sreloc == NULL) | |
2544 | { | |
2545 | sreloc = bfd_make_section (dynobj, name); | |
2546 | if (sreloc == NULL | |
2547 | || !bfd_set_section_flags (dynobj, sreloc, | |
2548 | (SEC_ALLOC | |
2549 | | SEC_LOAD | |
2550 | | SEC_HAS_CONTENTS | |
2551 | | SEC_IN_MEMORY | |
2552 | | SEC_LINKER_CREATED | |
2553 | | SEC_READONLY)) | |
2554 | || !bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2555 | return false; | |
2556 | } | |
2557 | } | |
2558 | ||
2559 | sreloc->_raw_size += sizeof (Elf32_External_Rela); | |
2560 | ||
2561 | /* If we are linking with -Bsymbolic, we count the number of PC | |
2562 | relative relocations we have entered for this symbol, so that | |
2563 | we can discard them again if the symbol is later defined by a | |
2564 | regular object. We know that h is really a pointer to an | |
2565 | elf_cris_link_hash_entry. */ | |
2566 | if ((ELF32_R_TYPE (rel->r_info) == R_CRIS_8_PCREL | |
2567 | || ELF32_R_TYPE (rel->r_info) == R_CRIS_16_PCREL | |
2568 | || ELF32_R_TYPE (rel->r_info) == R_CRIS_32_PCREL) | |
2569 | && info->symbolic) | |
2570 | { | |
2571 | struct elf_cris_link_hash_entry *eh; | |
2572 | struct elf_cris_pcrel_relocs_copied *p; | |
2573 | ||
2574 | eh = (struct elf_cris_link_hash_entry *) h; | |
2575 | ||
2576 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2577 | if (p->section == sreloc) | |
2578 | break; | |
2579 | ||
2580 | if (p == NULL) | |
2581 | { | |
2582 | p = ((struct elf_cris_pcrel_relocs_copied *) | |
2583 | bfd_alloc (dynobj, sizeof *p)); | |
2584 | if (p == NULL) | |
2585 | return false; | |
2586 | p->next = eh->pcrel_relocs_copied; | |
2587 | eh->pcrel_relocs_copied = p; | |
2588 | p->section = sreloc; | |
2589 | p->count = 0; | |
2590 | } | |
2591 | ||
2592 | ++p->count; | |
2593 | } | |
2594 | break; | |
2595 | ||
06c15ad7 HPN |
2596 | /* This relocation describes the C++ object vtable hierarchy. |
2597 | Reconstruct it for later use during GC. */ | |
2598 | case R_CRIS_GNU_VTINHERIT: | |
2599 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2600 | return false; | |
2601 | break; | |
a7c10850 | 2602 | |
06c15ad7 HPN |
2603 | /* This relocation describes which C++ vtable entries are actually |
2604 | used. Record for later use during GC. */ | |
2605 | case R_CRIS_GNU_VTENTRY: | |
2606 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
2607 | return false; | |
2608 | break; | |
2609 | } | |
2610 | } | |
a7c10850 | 2611 | |
06c15ad7 HPN |
2612 | return true; |
2613 | } | |
4da81684 | 2614 | |
915e5146 HPN |
2615 | /* Set the sizes of the dynamic sections. */ |
2616 | ||
2617 | static boolean | |
2618 | elf_cris_size_dynamic_sections (output_bfd, info) | |
2619 | bfd *output_bfd; | |
2620 | struct bfd_link_info *info; | |
2621 | { | |
2622 | bfd *dynobj; | |
2623 | asection *s; | |
2624 | boolean plt; | |
2625 | boolean relocs; | |
2626 | boolean reltext; | |
2627 | ||
2628 | dynobj = elf_hash_table (info)->dynobj; | |
2629 | BFD_ASSERT (dynobj != NULL); | |
2630 | ||
2631 | if (elf_hash_table (info)->dynamic_sections_created) | |
2632 | { | |
2633 | /* Set the contents of the .interp section to the interpreter. */ | |
2634 | if (!info->shared) | |
2635 | { | |
2636 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2637 | BFD_ASSERT (s != NULL); | |
2638 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2639 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2640 | } | |
2641 | } | |
2642 | else | |
2643 | { | |
2644 | /* Adjust all expected GOTPLT uses to use a GOT entry instead. */ | |
2645 | elf_cris_link_hash_traverse (elf_cris_hash_table (info), | |
2646 | elf_cris_adjust_gotplt_to_got, | |
2647 | (PTR) info); | |
2648 | ||
2649 | /* We may have created entries in the .rela.got section. | |
2650 | However, if we are not creating the dynamic sections, we will | |
2651 | not actually use these entries. Reset the size of .rela.got, | |
2652 | which will cause it to get stripped from the output file | |
2653 | below. */ | |
2654 | s = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2655 | if (s != NULL) | |
2656 | s->_raw_size = 0; | |
2657 | } | |
2658 | ||
2659 | /* If this is a -Bsymbolic shared link, then we need to discard all PC | |
2660 | relative relocs against symbols defined in a regular object. We | |
2661 | allocated space for them in the check_relocs routine, but we will not | |
2662 | fill them in in the relocate_section routine. We also discard space | |
2663 | for relocs that have become for local symbols due to symbol | |
2664 | visibility changes. */ | |
2665 | if (info->shared) | |
2666 | elf_cris_link_hash_traverse (elf_cris_hash_table (info), | |
2667 | elf_cris_discard_copies, | |
2668 | (PTR) info); | |
2669 | ||
2670 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2671 | determined the sizes of the various dynamic sections. Allocate | |
2672 | memory for them. */ | |
2673 | plt = false; | |
2674 | relocs = false; | |
2675 | reltext = false; | |
2676 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2677 | { | |
2678 | const char *name; | |
2679 | boolean strip; | |
2680 | ||
2681 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2682 | continue; | |
2683 | ||
2684 | /* It's OK to base decisions on the section name, because none | |
2685 | of the dynobj section names depend upon the input files. */ | |
2686 | name = bfd_get_section_name (dynobj, s); | |
2687 | ||
2688 | strip = false; | |
2689 | ||
2690 | if (strcmp (name, ".plt") == 0) | |
2691 | { | |
2692 | if (s->_raw_size == 0) | |
2693 | { | |
2694 | /* Strip this section if we don't need it; see the | |
2695 | comment below. */ | |
2696 | strip = true; | |
2697 | } | |
2698 | else | |
2699 | { | |
2700 | /* Remember whether there is a PLT. */ | |
2701 | plt = true; | |
2702 | } | |
2703 | } | |
2704 | else if (strncmp (name, ".rela", 5) == 0) | |
2705 | { | |
2706 | if (s->_raw_size == 0) | |
2707 | { | |
2708 | /* If we don't need this section, strip it from the | |
2709 | output file. This is mostly to handle .rela.bss and | |
2710 | .rela.plt. We must create both sections in | |
2711 | create_dynamic_sections, because they must be created | |
2712 | before the linker maps input sections to output | |
2713 | sections. The linker does that before | |
2714 | adjust_dynamic_symbol is called, and it is that | |
2715 | function which decides whether anything needs to go | |
2716 | into these sections. */ | |
2717 | strip = true; | |
2718 | } | |
2719 | else | |
2720 | { | |
2721 | asection *target; | |
2722 | ||
2723 | /* Remember whether there are any reloc sections other | |
2724 | than .rela.plt. */ | |
2725 | if (strcmp (name, ".rela.plt") != 0) | |
2726 | { | |
2727 | const char *outname; | |
2728 | ||
2729 | relocs = true; | |
2730 | ||
2731 | /* If this relocation section applies to a read only | |
2732 | section, then we probably need a DT_TEXTREL entry. | |
2733 | The entries in the .rela.plt section are actually | |
2734 | associated with .got.plt, which we created ourselves | |
2735 | and so know is not readonly. */ | |
2736 | outname = bfd_get_section_name (output_bfd, | |
2737 | s->output_section); | |
2738 | target | |
2739 | = bfd_get_section_by_name (output_bfd, | |
2740 | outname + strlen (".rela")); | |
2741 | ||
2742 | /* We have to test the .text section by name, becase for | |
2743 | some reason it does not have SEC_READONLY set at this | |
2744 | time. That flag is actually set in ldmain.c:main | |
2745 | specifically for ".text" at a time long after this | |
2746 | function is called. FIXME: This might be due to a | |
2747 | general bug. FIXME: Have testcase for this. */ | |
2748 | if (target != NULL | |
2749 | && (target->flags & SEC_ALLOC) != 0 | |
2750 | && ((target->flags & SEC_READONLY) != 0 | |
2751 | || strcmp (outname + strlen (".rela"), | |
2752 | ".text") == 0)) | |
2753 | reltext = true; | |
2754 | } | |
2755 | ||
2756 | /* We use the reloc_count field as a counter if we need | |
2757 | to copy relocs into the output file. */ | |
2758 | s->reloc_count = 0; | |
2759 | } | |
2760 | } | |
2761 | else if (strncmp (name, ".got", 4) != 0) | |
2762 | { | |
2763 | /* It's not one of our sections, so don't allocate space. */ | |
2764 | continue; | |
2765 | } | |
2766 | ||
2767 | if (strip) | |
2768 | { | |
2769 | _bfd_strip_section_from_output (info, s); | |
2770 | continue; | |
2771 | } | |
2772 | ||
2773 | /* Allocate memory for the section contents. We use bfd_zalloc here | |
2774 | in case unused entries are not reclaimed before the section's | |
2775 | contents are written out. This should not happen, but this way | |
2776 | if it does, we will not write out garbage. For reloc sections, | |
2777 | this will make entries have the type R_CRIS_NONE. */ | |
2778 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
2779 | if (s->contents == NULL && s->_raw_size != 0) | |
2780 | return false; | |
2781 | } | |
2782 | ||
2783 | if (elf_hash_table (info)->dynamic_sections_created) | |
2784 | { | |
2785 | /* Add some entries to the .dynamic section. We fill in the | |
2786 | values later, in elf_cris_finish_dynamic_sections, but we | |
2787 | must add the entries now so that we get the correct size for | |
2788 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2789 | dynamic linker and used by the debugger. */ | |
2790 | if (!info->shared) | |
2791 | { | |
2792 | if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
2793 | return false; | |
2794 | } | |
2795 | ||
2796 | if (plt) | |
2797 | { | |
2798 | if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
2799 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
2800 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
2801 | || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
2802 | return false; | |
2803 | } | |
2804 | ||
2805 | if (relocs) | |
2806 | { | |
2807 | if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) | |
2808 | || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) | |
2809 | || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, | |
2810 | sizeof (Elf32_External_Rela))) | |
2811 | return false; | |
2812 | } | |
2813 | ||
2814 | if (reltext) | |
2815 | { | |
2816 | if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
2817 | return false; | |
2818 | info->flags |= DF_TEXTREL; | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | return true; | |
2823 | } | |
2824 | ||
2825 | /* This function is called via elf_cris_link_hash_traverse if we are | |
2826 | creating a shared object. In the -Bsymbolic case, it discards the | |
2827 | space allocated to copy PC relative relocs against symbols which | |
2828 | are defined in regular objects. For the normal non-symbolic case, | |
2829 | we also discard space for relocs that have become local due to | |
2830 | symbol visibility changes. We allocated space for them in the | |
2831 | check_relocs routine, but we won't fill them in in the | |
2832 | relocate_section routine. */ | |
2833 | ||
2834 | static boolean | |
2835 | elf_cris_discard_copies (h, inf) | |
2836 | struct elf_cris_link_hash_entry *h; | |
2837 | PTR inf; | |
2838 | { | |
2839 | struct elf_cris_pcrel_relocs_copied *s; | |
2840 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
2841 | ||
2842 | /* If a symbol has been forced local or we have found a regular | |
2843 | definition for the symbolic link case, then we won't be needing | |
2844 | any relocs. */ | |
2845 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
2846 | && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 | |
2847 | || info->symbolic)) | |
2848 | { | |
2849 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
2850 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
2851 | } | |
2852 | ||
2853 | return true; | |
2854 | } | |
2855 | ||
2856 | /* Reject a file depending on presence and expectation of prefixed | |
2857 | underscores on symbols. */ | |
4da81684 HPN |
2858 | |
2859 | static boolean | |
2860 | cris_elf_object_p (abfd) | |
2861 | bfd *abfd; | |
2862 | { | |
2863 | if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) | |
2864 | return (bfd_get_symbol_leading_char (abfd) == '_'); | |
2865 | else | |
2866 | return (bfd_get_symbol_leading_char (abfd) == 0); | |
2867 | } | |
2868 | ||
2869 | /* Mark presence or absence of leading underscore. */ | |
2870 | ||
2871 | static void | |
2872 | cris_elf_final_write_processing (abfd, linker) | |
2873 | bfd *abfd; | |
2874 | boolean linker ATTRIBUTE_UNUSED; | |
2875 | { | |
2876 | if (bfd_get_symbol_leading_char (abfd) == '_') | |
2877 | elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE; | |
2878 | else | |
2879 | elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE; | |
2880 | } | |
2881 | ||
2882 | /* Display the flags field. */ | |
2883 | ||
2884 | static boolean | |
2885 | cris_elf_print_private_bfd_data (abfd, ptr) | |
2886 | bfd *abfd; | |
2887 | PTR ptr; | |
2888 | { | |
2889 | FILE *file = (FILE *) ptr; | |
2890 | ||
2891 | BFD_ASSERT (abfd != NULL && ptr != NULL) | |
2892 | ||
2893 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
2894 | ||
2895 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); | |
2896 | ||
2897 | if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) | |
2898 | fprintf (file, _(" [symbols have a _ prefix]")); | |
2899 | ||
2900 | fputc ('\n', file); | |
2901 | return true; | |
2902 | } | |
2903 | ||
2904 | /* Don't mix files with and without a leading underscore. */ | |
2905 | ||
2906 | static boolean | |
2907 | cris_elf_merge_private_bfd_data (ibfd, obfd) | |
2908 | bfd *ibfd; | |
2909 | bfd *obfd; | |
2910 | { | |
2911 | flagword old_flags, new_flags; | |
2912 | ||
2913 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) | |
2914 | return false; | |
2915 | ||
2916 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
2917 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
2918 | return true; | |
2919 | ||
2920 | if (! elf_flags_init (obfd)) | |
2921 | { | |
2922 | /* This happens when ld starts out with a 'blank' output file. */ | |
2923 | elf_flags_init (obfd) = true; | |
2924 | ||
2925 | /* Set flags according to current bfd_target. */ | |
2926 | cris_elf_final_write_processing (obfd, false); | |
2927 | } | |
2928 | ||
2929 | old_flags = elf_elfheader (obfd)->e_flags; | |
2930 | new_flags = elf_elfheader (ibfd)->e_flags; | |
2931 | ||
2932 | /* Is this good or bad? We'll follow with other excluding flags. */ | |
2933 | if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE)) | |
2934 | { | |
2935 | (*_bfd_error_handler) | |
2936 | ((new_flags & EF_CRIS_UNDERSCORE) | |
2937 | ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols") | |
2938 | : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"), | |
2939 | bfd_get_filename (ibfd)); | |
2940 | bfd_set_error (bfd_error_bad_value); | |
2941 | return false; | |
2942 | } | |
2943 | ||
2944 | return true; | |
2945 | } | |
06c15ad7 HPN |
2946 | \f |
2947 | #define ELF_ARCH bfd_arch_cris | |
2948 | #define ELF_MACHINE_CODE EM_CRIS | |
2949 | #define ELF_MAXPAGESIZE 0x2000 | |
2950 | ||
2951 | #define TARGET_LITTLE_SYM bfd_elf32_cris_vec | |
2952 | #define TARGET_LITTLE_NAME "elf32-cris" | |
4da81684 | 2953 | #define elf_symbol_leading_char 0 |
06c15ad7 HPN |
2954 | |
2955 | #define elf_info_to_howto_rel NULL | |
2956 | #define elf_info_to_howto cris_info_to_howto_rela | |
2957 | #define elf_backend_relocate_section cris_elf_relocate_section | |
2958 | #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook | |
2959 | #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook | |
2960 | #define elf_backend_check_relocs cris_elf_check_relocs | |
2961 | ||
2962 | #define elf_backend_can_gc_sections 1 | |
2963 | ||
4da81684 HPN |
2964 | #define elf_backend_object_p cris_elf_object_p |
2965 | #define elf_backend_final_write_processing \ | |
2966 | cris_elf_final_write_processing | |
2967 | #define bfd_elf32_bfd_print_private_bfd_data \ | |
2968 | cris_elf_print_private_bfd_data | |
2969 | #define bfd_elf32_bfd_merge_private_bfd_data \ | |
2970 | cris_elf_merge_private_bfd_data | |
2971 | ||
06c15ad7 HPN |
2972 | #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup |
2973 | ||
915e5146 HPN |
2974 | #define bfd_elf32_bfd_link_hash_table_create \ |
2975 | elf_cris_link_hash_table_create | |
2976 | #define elf_backend_adjust_dynamic_symbol \ | |
2977 | elf_cris_adjust_dynamic_symbol | |
2978 | #define elf_backend_size_dynamic_sections \ | |
2979 | elf_cris_size_dynamic_sections | |
2980 | #define elf_backend_finish_dynamic_symbol \ | |
2981 | elf_cris_finish_dynamic_symbol | |
2982 | #define elf_backend_finish_dynamic_sections \ | |
2983 | elf_cris_finish_dynamic_sections | |
2984 | #define elf_backend_create_dynamic_sections \ | |
2985 | _bfd_elf_create_dynamic_sections | |
2986 | #define bfd_elf32_bfd_final_link \ | |
2987 | _bfd_elf32_gc_common_final_link | |
2988 | #define elf_backend_hide_symbol elf_cris_hide_symbol | |
2989 | ||
2990 | #define elf_backend_want_got_plt 1 | |
2991 | #define elf_backend_plt_readonly 1 | |
2992 | #define elf_backend_want_plt_sym 0 | |
2993 | #define elf_backend_got_header_size 12 | |
2994 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
2995 | ||
06c15ad7 HPN |
2996 | /* Later, we my want to optimize RELA entries into REL entries for dynamic |
2997 | linking and libraries (if it's a win of any significance). Until then, | |
2998 | take the easy route. */ | |
2999 | #define elf_backend_may_use_rel_p 0 | |
3000 | #define elf_backend_may_use_rela_p 1 | |
3001 | ||
3002 | #include "elf32-target.h" | |
4da81684 HPN |
3003 | |
3004 | #define INCLUDED_TARGET_FILE | |
3005 | ||
3006 | #undef TARGET_LITTLE_SYM | |
3007 | #undef TARGET_LITTLE_NAME | |
3008 | #undef elf_symbol_leading_char | |
3009 | ||
3010 | #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec | |
3011 | #define TARGET_LITTLE_NAME "elf32-us-cris" | |
3012 | #define elf_symbol_leading_char '_' | |
3013 | ||
3014 | #include "elf32-target.h" |