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889294f6 | 1 | /* 32-bit ELF support for TI PRU. |
2571583a | 2 | Copyright (C) 2014-2017 Free Software Foundation, Inc. |
889294f6 DD |
3 | Contributed by Dimitar Dimitrov <dimitar@dinux.eu> |
4 | Based on elf32-nios2.c | |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | MA 02110-1301, USA. */ | |
22 | ||
23 | /* This file handles TI PRU ELF targets. */ | |
24 | ||
25 | #include "sysdep.h" | |
26 | #include "bfd.h" | |
27 | #include "libbfd.h" | |
28 | #include "bfdlink.h" | |
29 | #include "genlink.h" | |
30 | #include "elf-bfd.h" | |
31 | #include "elf/pru.h" | |
32 | #include "opcode/pru.h" | |
33 | ||
34 | #define SWAP_VALS(A,B) \ | |
35 | do { \ | |
36 | (A) ^= (B); \ | |
37 | (B) ^= (A); \ | |
38 | (A) ^= (B); \ | |
39 | } while (0) | |
40 | ||
41 | /* Enable debugging printout at stdout with this variable. */ | |
42 | static bfd_boolean debug_relax = FALSE; | |
43 | ||
44 | /* Forward declarations. */ | |
45 | static bfd_reloc_status_type pru_elf32_pmem_relocate | |
46 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); | |
47 | static bfd_reloc_status_type pru_elf32_s10_pcrel_relocate | |
48 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); | |
49 | static bfd_reloc_status_type pru_elf32_u8_pcrel_relocate | |
50 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); | |
51 | static bfd_reloc_status_type pru_elf32_ldi32_relocate | |
52 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); | |
53 | static bfd_reloc_status_type bfd_elf_pru_diff_relocate | |
54 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); | |
55 | ||
56 | /* Target vector. */ | |
57 | extern const bfd_target pru_elf32_vec; | |
58 | ||
59 | /* The relocation table used for SHT_REL sections. */ | |
60 | static reloc_howto_type elf_pru_howto_table_rel[] = { | |
61 | /* No relocation. */ | |
62 | HOWTO (R_PRU_NONE, /* type */ | |
63 | 0, /* rightshift */ | |
64 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
65 | 3, /* bitsize */ | |
66 | FALSE, /* pc_relative */ | |
67 | 0, /* bitpos */ | |
68 | complain_overflow_dont,/* complain_on_overflow */ | |
69 | bfd_elf_generic_reloc, /* special_function */ | |
70 | "R_PRU_NONE", /* name */ | |
71 | FALSE, /* partial_inplace */ | |
72 | 0, /* src_mask */ | |
73 | 0, /* dst_mask */ | |
74 | FALSE), /* pcrel_offset */ | |
75 | ||
76 | HOWTO (R_PRU_16_PMEM, | |
77 | 2, | |
78 | 1, /* short */ | |
79 | 32, | |
80 | FALSE, | |
81 | 0, | |
82 | complain_overflow_dont, | |
83 | bfd_elf_generic_reloc, | |
84 | "R_PRU_16_PMEM", | |
85 | FALSE, | |
86 | 0, /* src_mask */ | |
87 | 0xffff, | |
88 | FALSE), | |
89 | ||
90 | HOWTO (R_PRU_U16_PMEMIMM, | |
91 | 2, | |
92 | 2, | |
93 | 32, | |
94 | FALSE, | |
95 | 8, | |
96 | complain_overflow_unsigned, | |
97 | pru_elf32_pmem_relocate, | |
98 | "R_PRU_U16_PMEMIMM", | |
99 | FALSE, | |
100 | 0, /* src_mask */ | |
101 | 0x00ffff00, | |
102 | FALSE), | |
103 | ||
104 | HOWTO (R_PRU_BFD_RELOC_16, | |
105 | 0, | |
106 | 1, /* short */ | |
107 | 16, | |
108 | FALSE, | |
109 | 0, | |
110 | complain_overflow_bitfield, | |
111 | bfd_elf_generic_reloc, | |
112 | "R_PRU_BFD_RELOC16", | |
113 | FALSE, | |
114 | 0, /* src_mask */ | |
115 | 0x0000ffff, | |
116 | FALSE), | |
117 | ||
118 | /* 16-bit unsigned immediate relocation. */ | |
119 | HOWTO (R_PRU_U16, /* type */ | |
120 | 0, /* rightshift */ | |
121 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
122 | 16, /* bitsize */ | |
123 | FALSE, /* pc_relative */ | |
124 | 8, /* bitpos */ | |
125 | complain_overflow_unsigned, /* complain on overflow */ | |
126 | bfd_elf_generic_reloc, /* special function */ | |
127 | "R_PRU_U16", /* name */ | |
128 | FALSE, /* partial_inplace */ | |
129 | 0, /* src_mask */ | |
130 | 0x00ffff00, /* dest_mask */ | |
131 | FALSE), /* pcrel_offset */ | |
132 | ||
133 | HOWTO (R_PRU_32_PMEM, | |
134 | 2, | |
135 | 2, /* long */ | |
136 | 32, | |
137 | FALSE, | |
138 | 0, | |
139 | complain_overflow_dont, | |
140 | pru_elf32_pmem_relocate, | |
141 | "R_PRU_32_PMEM", | |
142 | FALSE, | |
143 | 0, /* src_mask */ | |
144 | 0xffffffff, | |
145 | FALSE), | |
146 | ||
147 | HOWTO (R_PRU_BFD_RELOC_32, | |
148 | 0, | |
149 | 2, /* long */ | |
150 | 32, | |
151 | FALSE, | |
152 | 0, | |
153 | complain_overflow_dont, | |
154 | bfd_elf_generic_reloc, | |
155 | "R_PRU_BFD_RELOC32", | |
156 | FALSE, | |
157 | 0, /* src_mask */ | |
158 | 0xffffffff, | |
159 | FALSE), | |
160 | ||
161 | HOWTO (R_PRU_S10_PCREL, | |
162 | 2, | |
163 | 2, | |
164 | 10, | |
165 | TRUE, | |
166 | 0, | |
167 | complain_overflow_bitfield, | |
168 | pru_elf32_s10_pcrel_relocate, | |
169 | "R_PRU_S10_PCREL", | |
170 | FALSE, | |
171 | 0, /* src_mask */ | |
172 | 0x060000ff, | |
173 | TRUE), | |
174 | ||
175 | HOWTO (R_PRU_U8_PCREL, | |
176 | 2, | |
177 | 2, | |
178 | 8, | |
179 | TRUE, | |
180 | 0, | |
181 | complain_overflow_unsigned, | |
182 | pru_elf32_u8_pcrel_relocate, | |
183 | "R_PRU_U8_PCREL", | |
184 | FALSE, | |
185 | 0, /* src_mask */ | |
186 | 0x000000ff, | |
187 | TRUE), | |
188 | ||
189 | HOWTO (R_PRU_LDI32, | |
190 | 0, /* rightshift */ | |
191 | 4, /* size (4 = 8bytes) */ | |
192 | 32, /* bitsize */ | |
193 | FALSE, /* pc_relative */ | |
194 | 0, /* bitpos */ | |
195 | complain_overflow_unsigned, /* complain on overflow */ | |
196 | pru_elf32_ldi32_relocate, /* special function */ | |
197 | "R_PRU_LDI32", /* name */ | |
198 | FALSE, /* partial_inplace */ | |
199 | 0, /* src_mask */ | |
200 | 0xffffffff, /* dest_mask */ | |
201 | FALSE), /* pcrel_offset */ | |
202 | ||
203 | /* GNU-specific relocations. */ | |
204 | HOWTO (R_PRU_GNU_BFD_RELOC_8, | |
205 | 0, | |
206 | 0, /* byte */ | |
207 | 8, | |
208 | FALSE, | |
209 | 0, | |
210 | complain_overflow_bitfield, | |
211 | bfd_elf_generic_reloc, | |
212 | "R_PRU_BFD_RELOC8", | |
213 | FALSE, | |
214 | 0, /* src_mask */ | |
215 | 0x000000ff, | |
216 | FALSE), | |
217 | ||
218 | HOWTO (R_PRU_GNU_DIFF8, /* type */ | |
219 | 0, /* rightshift */ | |
220 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
221 | 8, /* bitsize */ | |
222 | FALSE, /* pc_relative */ | |
223 | 0, /* bitpos */ | |
224 | complain_overflow_bitfield, /* complain_on_overflow */ | |
225 | bfd_elf_pru_diff_relocate, /* special_function */ | |
226 | "R_PRU_DIFF8", /* name */ | |
227 | FALSE, /* partial_inplace */ | |
228 | 0, /* src_mask */ | |
229 | 0xff, /* dst_mask */ | |
230 | FALSE), /* pcrel_offset */ | |
231 | ||
232 | HOWTO (R_PRU_GNU_DIFF16, /* type */ | |
233 | 0, /* rightshift */ | |
234 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
235 | 16, /* bitsize */ | |
236 | FALSE, /* pc_relative */ | |
237 | 0, /* bitpos */ | |
238 | complain_overflow_bitfield, /* complain_on_overflow */ | |
239 | bfd_elf_pru_diff_relocate,/* special_function */ | |
240 | "R_PRU_DIFF16", /* name */ | |
241 | FALSE, /* partial_inplace */ | |
242 | 0, /* src_mask */ | |
243 | 0xffff, /* dst_mask */ | |
244 | FALSE), /* pcrel_offset */ | |
245 | ||
246 | HOWTO (R_PRU_GNU_DIFF32, /* type */ | |
247 | 0, /* rightshift */ | |
248 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
249 | 32, /* bitsize */ | |
250 | FALSE, /* pc_relative */ | |
251 | 0, /* bitpos */ | |
252 | complain_overflow_bitfield, /* complain_on_overflow */ | |
253 | bfd_elf_pru_diff_relocate,/* special_function */ | |
254 | "R_PRU_DIFF32", /* name */ | |
255 | FALSE, /* partial_inplace */ | |
256 | 0, /* src_mask */ | |
257 | 0xffffffff, /* dst_mask */ | |
258 | FALSE), /* pcrel_offset */ | |
259 | ||
260 | HOWTO (R_PRU_GNU_DIFF16_PMEM, /* type */ | |
261 | 0, /* rightshift */ | |
262 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
263 | 16, /* bitsize */ | |
264 | FALSE, /* pc_relative */ | |
265 | 0, /* bitpos */ | |
266 | complain_overflow_bitfield, /* complain_on_overflow */ | |
267 | bfd_elf_pru_diff_relocate,/* special_function */ | |
268 | "R_PRU_DIFF16_PMEM", /* name */ | |
269 | FALSE, /* partial_inplace */ | |
270 | 0, /* src_mask */ | |
271 | 0xffff, /* dst_mask */ | |
272 | FALSE), /* pcrel_offset */ | |
273 | ||
274 | HOWTO (R_PRU_GNU_DIFF32_PMEM, /* type */ | |
275 | 0, /* rightshift */ | |
276 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
277 | 32, /* bitsize */ | |
278 | FALSE, /* pc_relative */ | |
279 | 0, /* bitpos */ | |
280 | complain_overflow_bitfield, /* complain_on_overflow */ | |
281 | bfd_elf_pru_diff_relocate,/* special_function */ | |
282 | "R_PRU_DIFF32_PMEM", /* name */ | |
283 | FALSE, /* partial_inplace */ | |
284 | 0, /* src_mask */ | |
285 | 0xffffffff, /* dst_mask */ | |
286 | FALSE), /* pcrel_offset */ | |
287 | ||
288 | /* Add other relocations here. */ | |
289 | }; | |
290 | ||
291 | static unsigned char elf_code_to_howto_index[R_PRU_ILLEGAL + 1]; | |
292 | ||
293 | /* Return the howto for relocation RTYPE. */ | |
294 | static reloc_howto_type * | |
295 | lookup_howto (unsigned int rtype) | |
296 | { | |
297 | static int initialized = 0; | |
298 | int i; | |
299 | int howto_tbl_size = (int) (sizeof (elf_pru_howto_table_rel) | |
300 | / sizeof (elf_pru_howto_table_rel[0])); | |
301 | ||
302 | if (!initialized) | |
303 | { | |
304 | initialized = 1; | |
305 | memset (elf_code_to_howto_index, 0xff, | |
306 | sizeof (elf_code_to_howto_index)); | |
307 | for (i = 0; i < howto_tbl_size; i++) | |
308 | elf_code_to_howto_index[elf_pru_howto_table_rel[i].type] = i; | |
309 | } | |
310 | ||
311 | BFD_ASSERT (rtype <= R_PRU_ILLEGAL); | |
312 | i = elf_code_to_howto_index[rtype]; | |
313 | if (i >= howto_tbl_size) | |
314 | return 0; | |
315 | return elf_pru_howto_table_rel + i; | |
316 | } | |
317 | ||
318 | /* Map for converting BFD reloc types to PRU reloc types. */ | |
319 | struct elf_reloc_map | |
320 | { | |
321 | bfd_reloc_code_real_type bfd_val; | |
322 | enum elf_pru_reloc_type elf_val; | |
323 | }; | |
324 | ||
325 | static const struct elf_reloc_map pru_reloc_map[] = { | |
326 | {BFD_RELOC_NONE, R_PRU_NONE}, | |
327 | {BFD_RELOC_PRU_16_PMEM, R_PRU_16_PMEM}, | |
328 | {BFD_RELOC_PRU_U16_PMEMIMM, R_PRU_U16_PMEMIMM}, | |
329 | {BFD_RELOC_16, R_PRU_BFD_RELOC_16}, | |
330 | {BFD_RELOC_PRU_U16, R_PRU_U16}, | |
331 | {BFD_RELOC_PRU_32_PMEM, R_PRU_32_PMEM}, | |
332 | {BFD_RELOC_32, R_PRU_BFD_RELOC_32}, | |
333 | {BFD_RELOC_PRU_S10_PCREL, R_PRU_S10_PCREL}, | |
334 | {BFD_RELOC_PRU_U8_PCREL, R_PRU_U8_PCREL}, | |
335 | {BFD_RELOC_PRU_LDI32, R_PRU_LDI32}, | |
336 | ||
337 | {BFD_RELOC_8, R_PRU_GNU_BFD_RELOC_8}, | |
338 | {BFD_RELOC_PRU_GNU_DIFF8, R_PRU_GNU_DIFF8}, | |
339 | {BFD_RELOC_PRU_GNU_DIFF16, R_PRU_GNU_DIFF16}, | |
340 | {BFD_RELOC_PRU_GNU_DIFF32, R_PRU_GNU_DIFF32}, | |
341 | {BFD_RELOC_PRU_GNU_DIFF16_PMEM, R_PRU_GNU_DIFF16_PMEM}, | |
342 | {BFD_RELOC_PRU_GNU_DIFF32_PMEM, R_PRU_GNU_DIFF32_PMEM}, | |
343 | }; | |
344 | ||
345 | ||
346 | /* Assorted hash table functions. */ | |
347 | ||
348 | /* Create an entry in a PRU ELF linker hash table. */ | |
349 | static struct bfd_hash_entry * | |
350 | link_hash_newfunc (struct bfd_hash_entry *entry, | |
351 | struct bfd_hash_table *table, const char *string) | |
352 | { | |
353 | /* Allocate the structure if it has not already been allocated by a | |
354 | subclass. */ | |
355 | if (entry == NULL) | |
356 | { | |
357 | entry = bfd_hash_allocate (table, | |
358 | sizeof (struct elf_link_hash_entry)); | |
359 | if (entry == NULL) | |
360 | return entry; | |
361 | } | |
362 | ||
363 | /* Call the allocation method of the superclass. */ | |
364 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
365 | ||
366 | return entry; | |
367 | } | |
368 | ||
369 | /* Implement bfd_elf32_bfd_reloc_type_lookup: | |
370 | Given a BFD reloc type, return a howto structure. */ | |
371 | static reloc_howto_type * | |
372 | pru_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
373 | bfd_reloc_code_real_type code) | |
374 | { | |
375 | int i; | |
376 | for (i = 0; | |
377 | i < (int) (sizeof (pru_reloc_map) / sizeof (struct elf_reloc_map)); | |
378 | ++i) | |
379 | if (pru_reloc_map[i].bfd_val == code) | |
380 | return lookup_howto ((unsigned int) pru_reloc_map[i].elf_val); | |
381 | return NULL; | |
382 | } | |
383 | ||
384 | /* Implement bfd_elf32_bfd_reloc_name_lookup: | |
385 | Given a reloc name, return a howto structure. */ | |
386 | static reloc_howto_type * | |
387 | pru_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
388 | const char *r_name) | |
389 | { | |
390 | unsigned int i; | |
391 | for (i = 0; | |
392 | i < (sizeof (elf_pru_howto_table_rel) | |
393 | / sizeof (elf_pru_howto_table_rel[0])); | |
394 | i++) | |
395 | if (elf_pru_howto_table_rel[i].name | |
396 | && strcasecmp (elf_pru_howto_table_rel[i].name, r_name) == 0) | |
397 | return &elf_pru_howto_table_rel[i]; | |
398 | ||
399 | return NULL; | |
400 | } | |
401 | ||
402 | /* Implement elf_info_to_howto: | |
403 | Given a ELF32 relocation, fill in a arelent structure. */ | |
404 | static void | |
405 | pru_elf32_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, | |
406 | Elf_Internal_Rela *dst) | |
407 | { | |
408 | unsigned int r_type; | |
409 | ||
410 | r_type = ELF32_R_TYPE (dst->r_info); | |
411 | BFD_ASSERT (r_type < R_PRU_ILLEGAL); | |
412 | cache_ptr->howto = lookup_howto (r_type); | |
413 | } | |
414 | ||
415 | /* Do the relocations that require special handling. */ | |
416 | /* Produce a word address for program memory. Linker scripts will put .text | |
417 | at a high offset in order to differentiate it from .data. So here we also | |
418 | mask the high bits of PMEM address. | |
419 | ||
420 | But why 1MB when internal Program Memory much smaller? We want to catch | |
421 | unintended overflows. | |
422 | ||
423 | Why not use (1<<31) as an offset and a mask? Sitara DDRAM usually resides | |
424 | there, and users might want to put some shared carveout memory region in | |
425 | their linker scripts. So 0x80000000 might be a valid .data address. | |
426 | ||
427 | Note that we still keep and pass down the original howto. This way we | |
428 | can reuse this function for several different relocations. */ | |
429 | static bfd_reloc_status_type | |
430 | pru_elf32_do_pmem_relocate (bfd *abfd, reloc_howto_type *howto, | |
431 | asection *input_section, | |
432 | bfd_byte *data, bfd_vma offset, | |
433 | bfd_vma symbol_value, bfd_vma addend) | |
434 | { | |
435 | symbol_value = symbol_value + addend; | |
436 | addend = 0; | |
437 | symbol_value &= 0x3fffff; | |
438 | return _bfd_final_link_relocate (howto, abfd, input_section, | |
439 | data, offset, symbol_value, addend); | |
440 | } | |
441 | ||
442 | /* Direct copy of _bfd_final_link_relocate, but with special | |
443 | "fill-in". This copy-paste mumbo jumbo is only needed because BFD | |
444 | cannot deal correctly with non-contiguous bit fields. */ | |
445 | static bfd_reloc_status_type | |
446 | pru_elf32_do_s10_pcrel_relocate (bfd *input_bfd, reloc_howto_type *howto, | |
447 | asection *input_section, | |
448 | bfd_byte *contents, bfd_vma address, | |
449 | bfd_vma relocation, bfd_vma addend) | |
450 | { | |
451 | bfd_byte *location; | |
452 | bfd_vma x = 0; | |
453 | bfd_vma qboff; | |
454 | bfd_reloc_status_type flag = bfd_reloc_ok; | |
455 | ||
456 | /* Sanity check the address. */ | |
457 | if (address > bfd_get_section_limit (input_bfd, input_section)) | |
458 | return bfd_reloc_outofrange; | |
459 | ||
460 | BFD_ASSERT (howto->pc_relative); | |
461 | BFD_ASSERT (howto->pcrel_offset); | |
462 | ||
463 | relocation = relocation + addend - (input_section->output_section->vma | |
464 | + input_section->output_offset) - address; | |
465 | ||
466 | location = contents + address; | |
467 | ||
468 | /* Get the value we are going to relocate. */ | |
469 | BFD_ASSERT (bfd_get_reloc_size (howto) == 4); | |
470 | x = bfd_get_32 (input_bfd, location); | |
471 | ||
472 | qboff = GET_BROFF_SIGNED (x) << howto->rightshift; | |
473 | relocation += qboff; | |
474 | ||
475 | BFD_ASSERT (howto->complain_on_overflow == complain_overflow_bitfield); | |
476 | ||
477 | if (relocation > 2047 && relocation < (bfd_vma)-2048l) | |
478 | flag = bfd_reloc_overflow; | |
479 | ||
480 | /* Check that target address is word-aligned. */ | |
481 | if (relocation & ((1 << howto->rightshift) - 1)) | |
482 | flag = bfd_reloc_outofrange; | |
483 | ||
484 | relocation >>= (bfd_vma) howto->rightshift; | |
485 | ||
486 | /* Fill-in the RELOCATION to the right bits of X. */ | |
487 | SET_BROFF_URAW (x, relocation); | |
488 | ||
489 | bfd_put_32 (input_bfd, x, location); | |
490 | ||
491 | return flag; | |
492 | } | |
493 | ||
494 | static bfd_reloc_status_type | |
495 | pru_elf32_do_u8_pcrel_relocate (bfd *abfd, reloc_howto_type *howto, | |
496 | asection *input_section, | |
497 | bfd_byte *data, bfd_vma offset, | |
498 | bfd_vma symbol_value, bfd_vma addend) | |
499 | { | |
500 | bfd_vma relocation; | |
501 | ||
502 | BFD_ASSERT (howto->pc_relative); | |
503 | BFD_ASSERT (howto->pcrel_offset); | |
504 | ||
505 | relocation = symbol_value + addend - (input_section->output_section->vma | |
506 | + input_section->output_offset) - offset; | |
507 | relocation >>= howto->rightshift; | |
508 | ||
509 | /* 0 and 1 are invalid target labels for LOOP. We cannot | |
510 | encode this info in HOWTO, so catch such cases here. */ | |
511 | if (relocation < 2) | |
512 | return bfd_reloc_outofrange; | |
513 | ||
514 | return _bfd_final_link_relocate (howto, abfd, input_section, | |
515 | data, offset, symbol_value, addend); | |
516 | } | |
517 | ||
518 | /* Idea and code taken from elf32-d30v. */ | |
519 | static bfd_reloc_status_type | |
520 | pru_elf32_do_ldi32_relocate (bfd *abfd, reloc_howto_type *howto, | |
521 | asection *input_section, | |
522 | bfd_byte *data, bfd_vma offset, | |
523 | bfd_vma symbol_value, bfd_vma addend) | |
524 | { | |
525 | bfd_signed_vma relocation; | |
526 | bfd_size_type octets = offset * bfd_octets_per_byte (abfd); | |
527 | bfd_byte *location; | |
528 | unsigned long in1, in2, num; | |
529 | ||
530 | /* A hacked-up version of _bfd_final_link_relocate() follows. */ | |
531 | ||
532 | /* Sanity check the address. */ | |
533 | if (octets + bfd_get_reloc_size (howto) | |
534 | > bfd_get_section_limit_octets (abfd, input_section)) | |
535 | return bfd_reloc_outofrange; | |
536 | ||
537 | /* This function assumes that we are dealing with a basic relocation | |
538 | against a symbol. We want to compute the value of the symbol to | |
539 | relocate to. This is just VALUE, the value of the symbol, plus | |
540 | ADDEND, any addend associated with the reloc. */ | |
541 | relocation = symbol_value + addend; | |
542 | ||
543 | BFD_ASSERT (!howto->pc_relative); | |
544 | ||
545 | /* A hacked-up version of _bfd_relocate_contents() follows. */ | |
546 | location = data + offset * bfd_octets_per_byte (abfd); | |
547 | ||
548 | BFD_ASSERT (!howto->pc_relative); | |
549 | ||
550 | in1 = bfd_get_32 (abfd, location); | |
551 | in2 = bfd_get_32 (abfd, location + 4); | |
552 | ||
553 | /* Extract the addend - should be zero per my understanding. */ | |
554 | num = GET_INSN_FIELD (IMM16, in1) | (GET_INSN_FIELD (IMM16, in2) << 16); | |
555 | BFD_ASSERT (!num); | |
556 | ||
557 | relocation += num; | |
558 | ||
559 | SET_INSN_FIELD (IMM16, in1, relocation & 0xffff); | |
560 | SET_INSN_FIELD (IMM16, in2, relocation >> 16); | |
561 | ||
562 | bfd_put_32 (abfd, in1, location); | |
563 | bfd_put_32 (abfd, in2, location + 4); | |
564 | ||
565 | return bfd_reloc_ok; | |
566 | } | |
567 | ||
568 | /* HOWTO handlers for relocations that require special handling. */ | |
569 | ||
570 | static bfd_reloc_status_type | |
571 | pru_elf32_pmem_relocate (bfd *abfd, arelent *reloc_entry, | |
572 | asymbol *symbol, void *data, | |
573 | asection *input_section, bfd *output_bfd, | |
574 | char **error_message) | |
575 | { | |
576 | /* If this is a relocatable link (output_bfd test tells us), just | |
577 | call the generic function. Any adjustment will be done at final | |
578 | link time. */ | |
579 | if (output_bfd != NULL) | |
580 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, | |
581 | input_section, output_bfd, error_message); | |
582 | ||
583 | return pru_elf32_do_pmem_relocate (abfd, reloc_entry->howto, | |
584 | input_section, | |
585 | data, reloc_entry->address, | |
586 | (symbol->value | |
587 | + symbol->section->output_section->vma | |
588 | + symbol->section->output_offset), | |
589 | reloc_entry->addend); | |
590 | } | |
591 | ||
592 | static bfd_reloc_status_type | |
593 | pru_elf32_s10_pcrel_relocate (bfd *abfd, arelent *reloc_entry, | |
594 | asymbol *symbol, void *data, | |
595 | asection *input_section, bfd *output_bfd, | |
596 | char **error_message) | |
597 | { | |
598 | /* If this is a relocatable link (output_bfd test tells us), just | |
599 | call the generic function. Any adjustment will be done at final | |
600 | link time. */ | |
601 | if (output_bfd != NULL) | |
602 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, | |
603 | input_section, output_bfd, error_message); | |
604 | ||
605 | return pru_elf32_do_s10_pcrel_relocate (abfd, reloc_entry->howto, | |
606 | input_section, data, | |
607 | reloc_entry->address, | |
608 | (symbol->value | |
609 | + symbol->section->output_section->vma | |
610 | + symbol->section->output_offset), | |
611 | reloc_entry->addend); | |
612 | } | |
613 | ||
614 | static bfd_reloc_status_type | |
615 | pru_elf32_u8_pcrel_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol, | |
616 | void *data, asection *input_section, | |
617 | bfd *output_bfd, | |
618 | char **error_message) | |
619 | { | |
620 | /* If this is a relocatable link (output_bfd test tells us), just | |
621 | call the generic function. Any adjustment will be done at final | |
622 | link time. */ | |
623 | if (output_bfd != NULL) | |
624 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, | |
625 | input_section, output_bfd, error_message); | |
626 | ||
627 | return pru_elf32_do_u8_pcrel_relocate (abfd, reloc_entry->howto, | |
628 | input_section, | |
629 | data, reloc_entry->address, | |
630 | (symbol->value | |
631 | + symbol->section->output_section->vma | |
632 | + symbol->section->output_offset), | |
633 | reloc_entry->addend); | |
634 | } | |
635 | ||
636 | static bfd_reloc_status_type | |
637 | pru_elf32_ldi32_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol, | |
638 | void *data, asection *input_section, | |
639 | bfd *output_bfd, | |
640 | char **error_message) | |
641 | { | |
642 | /* If this is a relocatable link (output_bfd test tells us), just | |
643 | call the generic function. Any adjustment will be done at final | |
644 | link time. */ | |
645 | if (output_bfd != NULL) | |
646 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, | |
647 | input_section, output_bfd, error_message); | |
648 | ||
649 | return pru_elf32_do_ldi32_relocate (abfd, reloc_entry->howto, | |
650 | input_section, | |
651 | data, reloc_entry->address, | |
652 | (symbol->value | |
653 | + symbol->section->output_section->vma | |
654 | + symbol->section->output_offset), | |
655 | reloc_entry->addend); | |
656 | } | |
657 | ||
658 | ||
659 | /* Implement elf_backend_relocate_section. */ | |
660 | static bfd_boolean | |
661 | pru_elf32_relocate_section (bfd *output_bfd, | |
662 | struct bfd_link_info *info, | |
663 | bfd *input_bfd, | |
664 | asection *input_section, | |
665 | bfd_byte *contents, | |
666 | Elf_Internal_Rela *relocs, | |
667 | Elf_Internal_Sym *local_syms, | |
668 | asection **local_sections) | |
669 | { | |
670 | Elf_Internal_Shdr *symtab_hdr; | |
671 | struct elf_link_hash_entry **sym_hashes; | |
672 | Elf_Internal_Rela *rel; | |
673 | Elf_Internal_Rela *relend; | |
674 | ||
675 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
676 | sym_hashes = elf_sym_hashes (input_bfd); | |
677 | relend = relocs + input_section->reloc_count; | |
678 | ||
679 | for (rel = relocs; rel < relend; rel++) | |
680 | { | |
681 | reloc_howto_type *howto; | |
682 | unsigned long r_symndx; | |
683 | Elf_Internal_Sym *sym; | |
684 | asection *sec; | |
685 | struct elf_link_hash_entry *h; | |
686 | bfd_vma relocation; | |
687 | bfd_reloc_status_type r = bfd_reloc_ok; | |
688 | const char *name = NULL; | |
689 | const char* msg = (const char*) NULL; | |
690 | bfd_boolean unresolved_reloc; | |
691 | ||
692 | r_symndx = ELF32_R_SYM (rel->r_info); | |
693 | ||
694 | howto = lookup_howto ((unsigned) ELF32_R_TYPE (rel->r_info)); | |
695 | h = NULL; | |
696 | sym = NULL; | |
697 | sec = NULL; | |
698 | ||
699 | if (r_symndx < symtab_hdr->sh_info) | |
700 | { | |
701 | sym = local_syms + r_symndx; | |
702 | sec = local_sections[r_symndx]; | |
703 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
704 | } | |
705 | else | |
706 | { | |
707 | bfd_boolean warned, ignored; | |
708 | ||
709 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
710 | r_symndx, symtab_hdr, sym_hashes, | |
711 | h, sec, relocation, | |
712 | unresolved_reloc, warned, ignored); | |
713 | } | |
714 | ||
715 | if (sec && discarded_section (sec)) | |
716 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
717 | rel, 1, relend, howto, 0, contents); | |
718 | ||
719 | /* Nothing more to do unless this is a final link. */ | |
720 | if (bfd_link_relocatable (info)) | |
721 | continue; | |
722 | ||
723 | if (howto) | |
724 | { | |
725 | switch (howto->type) | |
726 | { | |
727 | case R_PRU_NONE: | |
728 | /* We don't need to find a value for this symbol. It's just a | |
729 | marker. */ | |
730 | r = bfd_reloc_ok; | |
731 | break; | |
732 | ||
733 | case R_PRU_U16_PMEMIMM: | |
734 | case R_PRU_32_PMEM: | |
735 | case R_PRU_16_PMEM: | |
736 | r = pru_elf32_do_pmem_relocate (input_bfd, howto, | |
737 | input_section, | |
738 | contents, rel->r_offset, | |
739 | relocation, rel->r_addend); | |
740 | break; | |
741 | case R_PRU_S10_PCREL: | |
742 | r = pru_elf32_do_s10_pcrel_relocate (input_bfd, howto, | |
743 | input_section, | |
744 | contents, | |
745 | rel->r_offset, | |
746 | relocation, | |
747 | rel->r_addend); | |
748 | break; | |
749 | case R_PRU_U8_PCREL: | |
750 | r = pru_elf32_do_u8_pcrel_relocate (input_bfd, howto, | |
751 | input_section, | |
752 | contents, | |
753 | rel->r_offset, | |
754 | relocation, | |
755 | rel->r_addend); | |
756 | break; | |
757 | case R_PRU_LDI32: | |
758 | r = pru_elf32_do_ldi32_relocate (input_bfd, howto, | |
759 | input_section, | |
760 | contents, | |
761 | rel->r_offset, | |
762 | relocation, | |
763 | rel->r_addend); | |
764 | break; | |
765 | case R_PRU_GNU_DIFF8: | |
766 | case R_PRU_GNU_DIFF16: | |
767 | case R_PRU_GNU_DIFF32: | |
768 | case R_PRU_GNU_DIFF16_PMEM: | |
769 | case R_PRU_GNU_DIFF32_PMEM: | |
770 | /* Nothing to do here, as contents already contain the | |
771 | diff value. */ | |
772 | r = bfd_reloc_ok; | |
773 | break; | |
774 | ||
775 | default: | |
776 | r = _bfd_final_link_relocate (howto, input_bfd, | |
777 | input_section, contents, | |
778 | rel->r_offset, relocation, | |
779 | rel->r_addend); | |
780 | break; | |
781 | } | |
782 | } | |
783 | else | |
784 | r = bfd_reloc_notsupported; | |
785 | ||
786 | if (r != bfd_reloc_ok) | |
787 | { | |
788 | if (h != NULL) | |
789 | name = h->root.root.string; | |
790 | else | |
791 | { | |
792 | name = bfd_elf_string_from_elf_section (input_bfd, | |
793 | symtab_hdr->sh_link, | |
794 | sym->st_name); | |
795 | if (name == NULL || *name == '\0') | |
796 | name = bfd_section_name (input_bfd, sec); | |
797 | } | |
798 | ||
799 | switch (r) | |
800 | { | |
801 | case bfd_reloc_overflow: | |
802 | (*info->callbacks->reloc_overflow) (info, NULL, name, | |
803 | howto->name, (bfd_vma) 0, | |
804 | input_bfd, input_section, | |
805 | rel->r_offset); | |
806 | break; | |
807 | ||
808 | case bfd_reloc_undefined: | |
809 | (*info->callbacks->undefined_symbol) (info, name, input_bfd, | |
810 | input_section, | |
811 | rel->r_offset, TRUE); | |
812 | break; | |
813 | ||
814 | case bfd_reloc_outofrange: | |
815 | if (msg == NULL) | |
816 | msg = _("relocation out of range"); | |
817 | break; | |
818 | ||
819 | case bfd_reloc_notsupported: | |
820 | if (msg == NULL) | |
821 | msg = _("unsupported relocation"); | |
822 | break; | |
823 | ||
824 | case bfd_reloc_dangerous: | |
825 | if (msg == NULL) | |
826 | msg = _("dangerous relocation"); | |
827 | break; | |
828 | ||
829 | default: | |
830 | if (msg == NULL) | |
831 | msg = _("unknown error"); | |
832 | break; | |
833 | } | |
834 | ||
835 | if (msg) | |
836 | { | |
837 | (*info->callbacks->warning) (info, msg, name, input_bfd, | |
838 | input_section, rel->r_offset); | |
839 | return FALSE; | |
840 | } | |
841 | } | |
842 | } | |
843 | return TRUE; | |
844 | } | |
845 | ||
846 | \f | |
847 | /* Perform a diff relocation. Nothing to do, as the difference value is | |
848 | already written into the section's contents. */ | |
849 | ||
850 | static bfd_reloc_status_type | |
851 | bfd_elf_pru_diff_relocate (bfd *abfd ATTRIBUTE_UNUSED, | |
852 | arelent *reloc_entry ATTRIBUTE_UNUSED, | |
853 | asymbol *symbol ATTRIBUTE_UNUSED, | |
854 | void *data ATTRIBUTE_UNUSED, | |
855 | asection *input_section ATTRIBUTE_UNUSED, | |
856 | bfd *output_bfd ATTRIBUTE_UNUSED, | |
857 | char **error_message ATTRIBUTE_UNUSED) | |
858 | { | |
859 | return bfd_reloc_ok; | |
860 | } | |
861 | ||
862 | ||
863 | /* Returns whether the relocation type passed is a diff reloc. */ | |
864 | ||
865 | static bfd_boolean | |
866 | elf32_pru_is_diff_reloc (Elf_Internal_Rela *irel) | |
867 | { | |
868 | return (ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF8 | |
869 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16 | |
870 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32 | |
871 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16_PMEM | |
872 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32_PMEM); | |
873 | } | |
874 | ||
875 | /* Reduce the diff value written in the section by count if the shrinked | |
876 | insn address happens to fall between the two symbols for which this | |
877 | diff reloc was emitted. */ | |
878 | ||
879 | static void | |
880 | elf32_pru_adjust_diff_reloc_value (bfd *abfd, | |
881 | struct bfd_section *isec, | |
882 | Elf_Internal_Rela *irel, | |
883 | bfd_vma symval, | |
884 | bfd_vma shrinked_insn_address, | |
885 | int count) | |
886 | { | |
887 | unsigned char *reloc_contents = NULL; | |
888 | unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents; | |
889 | if (isec_contents == NULL) | |
890 | { | |
891 | if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents)) | |
892 | return; | |
893 | ||
894 | elf_section_data (isec)->this_hdr.contents = isec_contents; | |
895 | } | |
896 | ||
897 | reloc_contents = isec_contents + irel->r_offset; | |
898 | ||
899 | /* Read value written in object file. */ | |
900 | bfd_signed_vma x = 0; | |
901 | switch (ELF32_R_TYPE (irel->r_info)) | |
902 | { | |
903 | case R_PRU_GNU_DIFF8: | |
904 | { | |
905 | x = bfd_get_signed_8 (abfd, reloc_contents); | |
906 | break; | |
907 | } | |
908 | case R_PRU_GNU_DIFF16: | |
909 | { | |
910 | x = bfd_get_signed_16 (abfd, reloc_contents); | |
911 | break; | |
912 | } | |
913 | case R_PRU_GNU_DIFF32: | |
914 | { | |
915 | x = bfd_get_signed_32 (abfd, reloc_contents); | |
916 | break; | |
917 | } | |
918 | case R_PRU_GNU_DIFF16_PMEM: | |
919 | { | |
920 | x = bfd_get_signed_16 (abfd, reloc_contents) * 4; | |
921 | break; | |
922 | } | |
923 | case R_PRU_GNU_DIFF32_PMEM: | |
924 | { | |
925 | x = bfd_get_signed_32 (abfd, reloc_contents) * 4; | |
926 | break; | |
927 | } | |
928 | default: | |
929 | { | |
930 | BFD_FAIL (); | |
931 | } | |
932 | } | |
933 | ||
934 | /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written | |
935 | into the object file at the reloc offset. sym2's logical value is | |
936 | symval (<start_of_section>) + reloc addend. Compute the start and end | |
937 | addresses and check if the shrinked insn falls between sym1 and sym2. */ | |
938 | ||
939 | bfd_vma end_address = symval + irel->r_addend; | |
940 | bfd_vma start_address = end_address - x; | |
941 | ||
942 | /* Shrink the absolute DIFF value (get the to labels "closer" | |
943 | together), because we have removed data between labels. */ | |
944 | if (x < 0) | |
945 | { | |
946 | x += count; | |
947 | /* In case the signed x is negative, restore order. */ | |
948 | SWAP_VALS (end_address, start_address); | |
949 | } | |
950 | else | |
951 | { | |
952 | x -= count; | |
953 | } | |
954 | ||
955 | /* Reduce the diff value by count bytes and write it back into section | |
956 | contents. */ | |
957 | ||
958 | if (shrinked_insn_address >= start_address | |
959 | && shrinked_insn_address <= end_address) | |
960 | { | |
961 | switch (ELF32_R_TYPE (irel->r_info)) | |
962 | { | |
963 | case R_PRU_GNU_DIFF8: | |
964 | { | |
965 | bfd_put_signed_8 (abfd, x & 0xFF, reloc_contents); | |
966 | break; | |
967 | } | |
968 | case R_PRU_GNU_DIFF16: | |
969 | { | |
970 | bfd_put_signed_16 (abfd, x & 0xFFFF, reloc_contents); | |
971 | break; | |
972 | } | |
973 | case R_PRU_GNU_DIFF32: | |
974 | { | |
975 | bfd_put_signed_32 (abfd, x & 0xFFFFFFFF, reloc_contents); | |
976 | break; | |
977 | } | |
978 | case R_PRU_GNU_DIFF16_PMEM: | |
979 | { | |
980 | bfd_put_signed_16 (abfd, (x / 4) & 0xFFFF, reloc_contents); | |
981 | break; | |
982 | } | |
983 | case R_PRU_GNU_DIFF32_PMEM: | |
984 | { | |
985 | bfd_put_signed_32 (abfd, (x / 4) & 0xFFFFFFFF, reloc_contents); | |
986 | break; | |
987 | } | |
988 | default: | |
989 | { | |
990 | BFD_FAIL (); | |
991 | } | |
992 | } | |
993 | ||
994 | } | |
995 | } | |
996 | ||
997 | /* Delete some bytes from a section while changing the size of an instruction. | |
998 | The parameter "addr" denotes the section-relative offset pointing just | |
999 | behind the shrinked instruction. "addr+count" point at the first | |
1000 | byte just behind the original unshrinked instruction. | |
1001 | ||
1002 | Idea copied from the AVR port. */ | |
1003 | ||
1004 | static bfd_boolean | |
1005 | pru_elf_relax_delete_bytes (bfd *abfd, | |
1006 | asection *sec, | |
1007 | bfd_vma addr, | |
1008 | int count) | |
1009 | { | |
1010 | Elf_Internal_Shdr *symtab_hdr; | |
1011 | unsigned int sec_shndx; | |
1012 | bfd_byte *contents; | |
1013 | Elf_Internal_Rela *irel, *irelend; | |
1014 | Elf_Internal_Sym *isym; | |
1015 | Elf_Internal_Sym *isymbuf = NULL; | |
1016 | bfd_vma toaddr; | |
1017 | struct elf_link_hash_entry **sym_hashes; | |
1018 | struct elf_link_hash_entry **end_hashes; | |
1019 | unsigned int symcount; | |
1020 | ||
1021 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1022 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
1023 | contents = elf_section_data (sec)->this_hdr.contents; | |
1024 | ||
1025 | toaddr = sec->size; | |
1026 | ||
1027 | irel = elf_section_data (sec)->relocs; | |
1028 | irelend = irel + sec->reloc_count; | |
1029 | ||
1030 | /* Actually delete the bytes. */ | |
1031 | if (toaddr - addr - count > 0) | |
1032 | memmove (contents + addr, contents + addr + count, | |
1033 | (size_t) (toaddr - addr - count)); | |
1034 | sec->size -= count; | |
1035 | ||
1036 | /* Adjust all the reloc addresses. */ | |
1037 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) | |
1038 | { | |
1039 | bfd_vma old_reloc_address; | |
1040 | ||
1041 | old_reloc_address = (sec->output_section->vma | |
1042 | + sec->output_offset + irel->r_offset); | |
1043 | ||
1044 | /* Get the new reloc address. */ | |
1045 | if ((irel->r_offset > addr | |
1046 | && irel->r_offset < toaddr)) | |
1047 | { | |
1048 | if (debug_relax) | |
1049 | printf ("Relocation at address 0x%x needs to be moved.\n" | |
1050 | "Old section offset: 0x%x, New section offset: 0x%x \n", | |
1051 | (unsigned int) old_reloc_address, | |
1052 | (unsigned int) irel->r_offset, | |
1053 | (unsigned int) ((irel->r_offset) - count)); | |
1054 | ||
1055 | irel->r_offset -= count; | |
1056 | } | |
1057 | ||
1058 | } | |
1059 | ||
1060 | /* The reloc's own addresses are now ok. However, we need to readjust | |
1061 | the reloc's addend, i.e. the reloc's value if two conditions are met: | |
1062 | 1.) the reloc is relative to a symbol in this section that | |
1063 | is located in front of the shrinked instruction | |
1064 | 2.) symbol plus addend end up behind the shrinked instruction. | |
1065 | ||
1066 | The most common case where this happens are relocs relative to | |
1067 | the section-start symbol. | |
1068 | ||
1069 | This step needs to be done for all of the sections of the bfd. */ | |
1070 | ||
1071 | { | |
1072 | struct bfd_section *isec; | |
1073 | ||
1074 | for (isec = abfd->sections; isec; isec = isec->next) | |
1075 | { | |
1076 | bfd_vma symval; | |
1077 | bfd_vma shrinked_insn_address; | |
1078 | ||
1079 | if (isec->reloc_count == 0) | |
1080 | continue; | |
1081 | ||
1082 | shrinked_insn_address = (sec->output_section->vma | |
1083 | + sec->output_offset + addr - count); | |
1084 | ||
1085 | irel = elf_section_data (isec)->relocs; | |
1086 | /* PR 12161: Read in the relocs for this section if necessary. */ | |
1087 | if (irel == NULL) | |
1088 | irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); | |
1089 | ||
1090 | for (irelend = irel + isec->reloc_count; | |
1091 | irel < irelend; | |
1092 | irel++) | |
1093 | { | |
1094 | /* Read this BFD's local symbols if we haven't done | |
1095 | so already. */ | |
1096 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1097 | { | |
1098 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1099 | if (isymbuf == NULL) | |
1100 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1101 | symtab_hdr->sh_info, 0, | |
1102 | NULL, NULL, NULL); | |
1103 | if (isymbuf == NULL) | |
1104 | return FALSE; | |
1105 | } | |
1106 | ||
1107 | /* Get the value of the symbol referred to by the reloc. */ | |
1108 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1109 | { | |
1110 | /* A local symbol. */ | |
1111 | asection *sym_sec; | |
1112 | ||
1113 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1114 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1115 | symval = isym->st_value; | |
1116 | /* If the reloc is absolute, it will not have | |
1117 | a symbol or section associated with it. */ | |
1118 | if (sym_sec == sec) | |
1119 | { | |
1120 | symval += sym_sec->output_section->vma | |
1121 | + sym_sec->output_offset; | |
1122 | ||
1123 | if (debug_relax) | |
1124 | printf ("Checking if the relocation's " | |
1125 | "addend needs corrections.\n" | |
1126 | "Address of anchor symbol: 0x%x \n" | |
1127 | "Address of relocation target: 0x%x \n" | |
1128 | "Address of relaxed insn: 0x%x \n", | |
1129 | (unsigned int) symval, | |
1130 | (unsigned int) (symval + irel->r_addend), | |
1131 | (unsigned int) shrinked_insn_address); | |
1132 | ||
1133 | /* Shrink the special DIFF relocations. */ | |
1134 | if (elf32_pru_is_diff_reloc (irel)) | |
1135 | { | |
1136 | elf32_pru_adjust_diff_reloc_value (abfd, isec, irel, | |
1137 | symval, | |
1138 | shrinked_insn_address, | |
1139 | count); | |
1140 | } | |
1141 | ||
1142 | /* Fix the addend, if it is affected. */ | |
1143 | if (symval <= shrinked_insn_address | |
1144 | && (symval + irel->r_addend) > shrinked_insn_address) | |
1145 | { | |
1146 | ||
1147 | irel->r_addend -= count; | |
1148 | ||
1149 | if (debug_relax) | |
1150 | printf ("Relocation's addend needed to be fixed \n"); | |
1151 | } | |
1152 | } | |
1153 | /* else...Reference symbol is absolute. | |
1154 | No adjustment needed. */ | |
1155 | } | |
1156 | /* else...Reference symbol is extern. No need for adjusting | |
1157 | the addend. */ | |
1158 | } | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* Adjust the local symbols defined in this section. */ | |
1163 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1164 | /* Fix PR 9841, there may be no local symbols. */ | |
1165 | if (isym != NULL) | |
1166 | { | |
1167 | Elf_Internal_Sym *isymend; | |
1168 | ||
1169 | isymend = isym + symtab_hdr->sh_info; | |
1170 | for (; isym < isymend; isym++) | |
1171 | { | |
1172 | if (isym->st_shndx == sec_shndx) | |
1173 | { | |
1174 | if (isym->st_value > addr | |
1175 | && isym->st_value <= toaddr) | |
1176 | isym->st_value -= count; | |
1177 | ||
1178 | if (isym->st_value <= addr | |
1179 | && isym->st_value + isym->st_size > addr) | |
1180 | { | |
1181 | /* If this assert fires then we have a symbol that ends | |
1182 | part way through an instruction. Does that make | |
1183 | sense? */ | |
1184 | BFD_ASSERT (isym->st_value + isym->st_size >= addr + count); | |
1185 | isym->st_size -= count; | |
1186 | } | |
1187 | } | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | /* Now adjust the global symbols defined in this section. */ | |
1192 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) | |
1193 | - symtab_hdr->sh_info); | |
1194 | sym_hashes = elf_sym_hashes (abfd); | |
1195 | end_hashes = sym_hashes + symcount; | |
1196 | for (; sym_hashes < end_hashes; sym_hashes++) | |
1197 | { | |
1198 | struct elf_link_hash_entry *sym_hash = *sym_hashes; | |
1199 | if ((sym_hash->root.type == bfd_link_hash_defined | |
1200 | || sym_hash->root.type == bfd_link_hash_defweak) | |
1201 | && sym_hash->root.u.def.section == sec) | |
1202 | { | |
1203 | if (sym_hash->root.u.def.value > addr | |
1204 | && sym_hash->root.u.def.value <= toaddr) | |
1205 | sym_hash->root.u.def.value -= count; | |
1206 | ||
1207 | if (sym_hash->root.u.def.value <= addr | |
1208 | && (sym_hash->root.u.def.value + sym_hash->size > addr)) | |
1209 | { | |
1210 | /* If this assert fires then we have a symbol that ends | |
1211 | part way through an instruction. Does that make | |
1212 | sense? */ | |
1213 | BFD_ASSERT (sym_hash->root.u.def.value + sym_hash->size | |
1214 | >= addr + count); | |
1215 | sym_hash->size -= count; | |
1216 | } | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | return TRUE; | |
1221 | } | |
1222 | ||
1223 | static bfd_boolean | |
1224 | pru_elf32_relax_section (bfd * abfd, asection * sec, | |
1225 | struct bfd_link_info * link_info, | |
1226 | bfd_boolean * again) | |
1227 | { | |
1228 | Elf_Internal_Shdr * symtab_hdr; | |
1229 | Elf_Internal_Rela * internal_relocs; | |
1230 | Elf_Internal_Rela * irel; | |
1231 | Elf_Internal_Rela * irelend; | |
1232 | bfd_byte * contents = NULL; | |
1233 | Elf_Internal_Sym * isymbuf = NULL; | |
1234 | ||
1235 | /* Assume nothing changes. */ | |
1236 | *again = FALSE; | |
1237 | ||
1238 | /* We don't have to do anything for a relocatable link, if | |
1239 | this section does not have relocs, or if this is not a | |
1240 | code section. */ | |
1241 | if (bfd_link_relocatable (link_info) | |
1242 | || (sec->flags & SEC_RELOC) == 0 | |
1243 | || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) | |
1244 | return TRUE; | |
1245 | ||
1246 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; | |
1247 | ||
1248 | /* Get a copy of the native relocations. */ | |
1249 | internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, | |
1250 | link_info->keep_memory); | |
1251 | if (internal_relocs == NULL) | |
1252 | goto error_return; | |
1253 | ||
1254 | /* Walk through them looking for relaxing opportunities. */ | |
1255 | irelend = internal_relocs + sec->reloc_count; | |
1256 | ||
1257 | for (irel = internal_relocs; irel < irelend; irel++) | |
1258 | { | |
1259 | bfd_vma symval; | |
1260 | ||
1261 | /* Get the section contents if we haven't done so already. */ | |
1262 | if (contents == NULL) | |
1263 | { | |
1264 | /* Get cached copy if it exists. */ | |
1265 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1266 | contents = elf_section_data (sec)->this_hdr.contents; | |
1267 | else if (! bfd_malloc_and_get_section (abfd, sec, &contents)) | |
1268 | goto error_return; | |
1269 | } | |
1270 | ||
1271 | /* Read this BFD's local symbols if we haven't done so already. */ | |
1272 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1273 | { | |
1274 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1275 | if (isymbuf == NULL) | |
1276 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1277 | symtab_hdr->sh_info, 0, | |
1278 | NULL, NULL, NULL); | |
1279 | if (isymbuf == NULL) | |
1280 | goto error_return; | |
1281 | } | |
1282 | ||
1283 | /* Get the value of the symbol referred to by the reloc. */ | |
1284 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1285 | { | |
1286 | /* A local symbol. */ | |
1287 | Elf_Internal_Sym *isym; | |
1288 | asection *sym_sec; | |
1289 | ||
1290 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1291 | if (isym->st_shndx == SHN_UNDEF) | |
1292 | sym_sec = bfd_und_section_ptr; | |
1293 | else if (isym->st_shndx == SHN_ABS) | |
1294 | sym_sec = bfd_abs_section_ptr; | |
1295 | else if (isym->st_shndx == SHN_COMMON) | |
1296 | sym_sec = bfd_com_section_ptr; | |
1297 | else | |
1298 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1299 | symval = (isym->st_value | |
1300 | + sym_sec->output_section->vma + sym_sec->output_offset); | |
1301 | } | |
1302 | else | |
1303 | { | |
1304 | unsigned long indx; | |
1305 | struct elf_link_hash_entry *h; | |
1306 | ||
1307 | /* An external symbol. */ | |
1308 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; | |
1309 | h = elf_sym_hashes (abfd)[indx]; | |
1310 | BFD_ASSERT (h != NULL); | |
1311 | ||
1312 | if (h->root.type != bfd_link_hash_defined | |
1313 | && h->root.type != bfd_link_hash_defweak) | |
1314 | /* This appears to be a reference to an undefined | |
1315 | symbol. Just ignore it--it will be caught by the | |
1316 | regular reloc processing. */ | |
1317 | continue; | |
1318 | ||
1319 | symval = (h->root.u.def.value | |
1320 | + h->root.u.def.section->output_section->vma | |
1321 | + h->root.u.def.section->output_offset); | |
1322 | } | |
1323 | ||
1324 | /* For simplicity of coding, we are going to modify the section | |
1325 | contents, the section relocs, and the BFD symbol table. We | |
1326 | must tell the rest of the code not to free up this | |
1327 | information. It would be possible to instead create a table | |
1328 | of changes which have to be made, as is done in coff-mips.c; | |
1329 | that would be more work, but would require less memory when | |
1330 | the linker is run. */ | |
1331 | ||
1332 | /* Check if we can remove an LDI instruction from the LDI32 | |
1333 | pseudo instruction if the upper 16 operand bits are zero. */ | |
1334 | if (ELF32_R_TYPE (irel->r_info) == (int) R_PRU_LDI32) | |
1335 | { | |
1336 | bfd_vma value = symval + irel->r_addend; | |
1337 | ||
1338 | if (debug_relax) | |
1339 | printf ("R_PRU_LDI32 with value=0x%lx\n", (long) value); | |
1340 | ||
1341 | if ((long) value >> 16 == 0) | |
1342 | { | |
1343 | /* Note that we've changed the relocs, section contents. */ | |
1344 | elf_section_data (sec)->relocs = internal_relocs; | |
1345 | elf_section_data (sec)->this_hdr.contents = contents; | |
1346 | symtab_hdr->contents = (unsigned char *) isymbuf; | |
1347 | ||
1348 | /* Delete bytes. */ | |
1349 | if (!pru_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 4, 4)) | |
1350 | goto error_return; | |
1351 | ||
1352 | /* We're done with deletion of the second instruction. | |
1353 | Set a regular LDI relocation for the first instruction | |
1354 | we left to load the 16-bit value into the 32-bit | |
1355 | register. */ | |
1356 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), | |
1357 | R_PRU_U16); | |
1358 | ||
1359 | /* That will change things, so, we should relax again. | |
1360 | Note that this is not required, and it may be slow. */ | |
1361 | *again = TRUE; | |
1362 | } | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) | |
1367 | { | |
1368 | if (!link_info->keep_memory) | |
1369 | free (isymbuf); | |
1370 | else | |
1371 | { | |
1372 | /* Cache the symbols for elf_link_input_bfd. */ | |
1373 | symtab_hdr->contents = (unsigned char *) isymbuf; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | if (contents != NULL | |
1378 | && elf_section_data (sec)->this_hdr.contents != contents) | |
1379 | { | |
1380 | if (!link_info->keep_memory) | |
1381 | free (contents); | |
1382 | else | |
1383 | { | |
1384 | /* Cache the section contents for elf_link_input_bfd. */ | |
1385 | elf_section_data (sec)->this_hdr.contents = contents; | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | if (internal_relocs != NULL | |
1390 | && elf_section_data (sec)->relocs != internal_relocs) | |
1391 | free (internal_relocs); | |
1392 | ||
1393 | return TRUE; | |
1394 | ||
1395 | error_return: | |
1396 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) | |
1397 | free (isymbuf); | |
1398 | if (contents != NULL | |
1399 | && elf_section_data (sec)->this_hdr.contents != contents) | |
1400 | free (contents); | |
1401 | if (internal_relocs != NULL | |
1402 | && elf_section_data (sec)->relocs != internal_relocs) | |
1403 | free (internal_relocs); | |
1404 | ||
1405 | return FALSE; | |
1406 | } | |
1407 | ||
1408 | /* Free the derived linker hash table. */ | |
1409 | static void | |
1410 | pru_elf32_link_hash_table_free (bfd *obfd) | |
1411 | { | |
1412 | _bfd_elf_link_hash_table_free (obfd); | |
1413 | } | |
1414 | ||
1415 | /* Implement bfd_elf32_bfd_link_hash_table_create. */ | |
1416 | static struct bfd_link_hash_table * | |
1417 | pru_elf32_link_hash_table_create (bfd *abfd) | |
1418 | { | |
1419 | struct elf_link_hash_table *ret; | |
1420 | bfd_size_type amt = sizeof (struct elf_link_hash_table); | |
1421 | ||
1422 | ret = bfd_zmalloc (amt); | |
1423 | if (ret == NULL) | |
1424 | return NULL; | |
1425 | ||
1426 | if (!_bfd_elf_link_hash_table_init (ret, abfd, | |
1427 | link_hash_newfunc, | |
1428 | sizeof (struct | |
1429 | elf_link_hash_entry), | |
1430 | PRU_ELF_DATA)) | |
1431 | { | |
1432 | free (ret); | |
1433 | return NULL; | |
1434 | } | |
1435 | ||
1436 | ret->root.hash_table_free = pru_elf32_link_hash_table_free; | |
1437 | ||
1438 | return &ret->root; | |
1439 | } | |
1440 | ||
1441 | #define ELF_ARCH bfd_arch_pru | |
1442 | #define ELF_TARGET_ID PRU_ELF_DATA | |
1443 | #define ELF_MACHINE_CODE EM_TI_PRU | |
1444 | ||
1445 | #define ELF_MAXPAGESIZE 1 | |
1446 | ||
1447 | #define bfd_elf32_bfd_link_hash_table_create \ | |
1448 | pru_elf32_link_hash_table_create | |
1449 | ||
1450 | /* Relocation table lookup macros. */ | |
1451 | ||
1452 | #define bfd_elf32_bfd_reloc_type_lookup pru_elf32_bfd_reloc_type_lookup | |
1453 | #define bfd_elf32_bfd_reloc_name_lookup pru_elf32_bfd_reloc_name_lookup | |
1454 | ||
1455 | /* elf_info_to_howto (using RELA relocations). */ | |
1456 | ||
1457 | #define elf_info_to_howto pru_elf32_info_to_howto | |
1458 | ||
1459 | /* elf backend functions. */ | |
1460 | ||
1461 | #define elf_backend_rela_normal 1 | |
1462 | ||
1463 | #define elf_backend_relocate_section pru_elf32_relocate_section | |
1464 | #define bfd_elf32_bfd_relax_section pru_elf32_relax_section | |
1465 | ||
1466 | #define TARGET_LITTLE_SYM pru_elf32_vec | |
1467 | #define TARGET_LITTLE_NAME "elf32-pru" | |
1468 | ||
1469 | #include "elf32-target.h" |