1 /* BFD back-end for National Semiconductor's CRX ELF
2 Copyright (C) 2004-2016 Free Software Foundation, Inc.
3 Written by Tomer Levi, NSC, Israel.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/crx.h"
28
29 static reloc_howto_type *elf_crx_reloc_type_lookup
30 (bfd *, bfd_reloc_code_real_type);
31 static void elf_crx_info_to_howto
32 (bfd *, arelent *, Elf_Internal_Rela *);
33 static bfd_boolean elf32_crx_relax_delete_bytes
34 (struct bfd_link_info *, bfd *, asection *, bfd_vma, int);
35 static bfd_reloc_status_type crx_elf_final_link_relocate
36 (reloc_howto_type *, bfd *, bfd *, asection *,
37 bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
38 struct bfd_link_info *, asection *, int);
39 static bfd_boolean elf32_crx_relocate_section
40 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
41 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
42 static bfd_boolean elf32_crx_relax_section
43 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
44 static bfd_byte * elf32_crx_get_relocated_section_contents
45 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
46 bfd_byte *, bfd_boolean, asymbol **);
47
48 /* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
49
50 struct crx_reloc_map
51 {
52 bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
53 unsigned short crx_reloc_type; /* CRX relocation type. */
54 };
55
56 static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] =
57 {
58 {BFD_RELOC_NONE, R_CRX_NONE},
59 {BFD_RELOC_CRX_REL4, R_CRX_REL4},
60 {BFD_RELOC_CRX_REL8, R_CRX_REL8},
61 {BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP},
62 {BFD_RELOC_CRX_REL16, R_CRX_REL16},
63 {BFD_RELOC_CRX_REL24, R_CRX_REL24},
64 {BFD_RELOC_CRX_REL32, R_CRX_REL32},
65 {BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12},
66 {BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22},
67 {BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28},
68 {BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32},
69 {BFD_RELOC_CRX_ABS16, R_CRX_ABS16},
70 {BFD_RELOC_CRX_ABS32, R_CRX_ABS32},
71 {BFD_RELOC_CRX_NUM8, R_CRX_NUM8},
72 {BFD_RELOC_CRX_NUM16, R_CRX_NUM16},
73 {BFD_RELOC_CRX_NUM32, R_CRX_NUM32},
74 {BFD_RELOC_CRX_IMM16, R_CRX_IMM16},
75 {BFD_RELOC_CRX_IMM32, R_CRX_IMM32},
76 {BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8},
77 {BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16},
78 {BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32}
79 };
80
81 static reloc_howto_type crx_elf_howto_table[] =
82 {
83 HOWTO (R_CRX_NONE, /* type */
84 0, /* rightshift */
85 3, /* size */
86 0, /* bitsize */
87 FALSE, /* pc_relative */
88 0, /* bitpos */
89 complain_overflow_dont,/* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_CRX_NONE", /* name */
92 FALSE, /* partial_inplace */
93 0, /* src_mask */
94 0, /* dst_mask */
95 FALSE), /* pcrel_offset */
96
97 HOWTO (R_CRX_REL4, /* type */
98 1, /* rightshift */
99 0, /* size */
100 4, /* bitsize */
101 TRUE, /* pc_relative */
102 0, /* bitpos */
103 complain_overflow_bitfield,/* complain_on_overflow */
104 bfd_elf_generic_reloc, /* special_function */
105 "R_CRX_REL4", /* name */
106 FALSE, /* partial_inplace */
107 0x0, /* src_mask */
108 0xf, /* dst_mask */
109 FALSE), /* pcrel_offset */
110
111 HOWTO (R_CRX_REL8, /* type */
112 1, /* rightshift */
113 0, /* size */
114 8, /* bitsize */
115 TRUE, /* pc_relative */
116 0, /* bitpos */
117 complain_overflow_bitfield,/* complain_on_overflow */
118 bfd_elf_generic_reloc, /* special_function */
119 "R_CRX_REL8", /* name */
120 FALSE, /* partial_inplace */
121 0x0, /* src_mask */
122 0xff, /* dst_mask */
123 FALSE), /* pcrel_offset */
124
125 HOWTO (R_CRX_REL8_CMP, /* type */
126 1, /* rightshift */
127 0, /* size */
128 8, /* bitsize */
129 TRUE, /* pc_relative */
130 0, /* bitpos */
131 complain_overflow_bitfield,/* complain_on_overflow */
132 bfd_elf_generic_reloc, /* special_function */
133 "R_CRX_REL8_CMP", /* name */
134 FALSE, /* partial_inplace */
135 0x0, /* src_mask */
136 0xff, /* dst_mask */
137 FALSE), /* pcrel_offset */
138
139 HOWTO (R_CRX_REL16, /* type */
140 1, /* rightshift */
141 1, /* size */
142 16, /* bitsize */
143 TRUE, /* pc_relative */
144 0, /* bitpos */
145 complain_overflow_bitfield,/* complain_on_overflow */
146 bfd_elf_generic_reloc, /* special_function */
147 "R_CRX_REL16", /* name */
148 FALSE, /* partial_inplace */
149 0x0, /* src_mask */
150 0xffff, /* dst_mask */
151 FALSE), /* pcrel_offset */
152
153 HOWTO (R_CRX_REL24, /* type */
154 1, /* rightshift */
155 2, /* size */
156 24, /* bitsize */
157 TRUE, /* pc_relative */
158 0, /* bitpos */
159 complain_overflow_bitfield,/* complain_on_overflow */
160 bfd_elf_generic_reloc, /* special_function */
161 "R_CRX_REL24", /* name */
162 FALSE, /* partial_inplace */
163 0x0, /* src_mask */
164 0xffffff, /* dst_mask */
165 FALSE), /* pcrel_offset */
166
167 HOWTO (R_CRX_REL32, /* type */
168 1, /* rightshift */
169 2, /* size */
170 32, /* bitsize */
171 TRUE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_bitfield,/* complain_on_overflow */
174 bfd_elf_generic_reloc, /* special_function */
175 "R_CRX_REL32", /* name */
176 FALSE, /* partial_inplace */
177 0x0, /* src_mask */
178 0xffffffff, /* dst_mask */
179 FALSE), /* pcrel_offset */
180
181 HOWTO (R_CRX_REGREL12, /* type */
182 0, /* rightshift */
183 1, /* size */
184 12, /* bitsize */
185 FALSE, /* pc_relative */
186 0, /* bitpos */
187 complain_overflow_bitfield,/* complain_on_overflow */
188 bfd_elf_generic_reloc, /* special_function */
189 "R_CRX_REGREL12", /* name */
190 FALSE, /* partial_inplace */
191 0x0, /* src_mask */
192 0xfff, /* dst_mask */
193 FALSE), /* pcrel_offset */
194
195 HOWTO (R_CRX_REGREL22, /* type */
196 0, /* rightshift */
197 2, /* size */
198 22, /* bitsize */
199 FALSE, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_bitfield,/* complain_on_overflow */
202 bfd_elf_generic_reloc, /* special_function */
203 "R_CRX_REGREL22", /* name */
204 FALSE, /* partial_inplace */
205 0x0, /* src_mask */
206 0x3fffff, /* dst_mask */
207 FALSE), /* pcrel_offset */
208
209 HOWTO (R_CRX_REGREL28, /* type */
210 0, /* rightshift */
211 2, /* size */
212 28, /* bitsize */
213 FALSE, /* pc_relative */
214 0, /* bitpos */
215 complain_overflow_bitfield,/* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_CRX_REGREL28", /* name */
218 FALSE, /* partial_inplace */
219 0x0, /* src_mask */
220 0xfffffff, /* dst_mask */
221 FALSE), /* pcrel_offset */
222
223 HOWTO (R_CRX_REGREL32, /* type */
224 0, /* rightshift */
225 2, /* size */
226 32, /* bitsize */
227 FALSE, /* pc_relative */
228 0, /* bitpos */
229 complain_overflow_bitfield,/* complain_on_overflow */
230 bfd_elf_generic_reloc, /* special_function */
231 "R_CRX_REGREL32", /* name */
232 FALSE, /* partial_inplace */
233 0x0, /* src_mask */
234 0xffffffff, /* dst_mask */
235 FALSE), /* pcrel_offset */
236
237 HOWTO (R_CRX_ABS16, /* type */
238 0, /* rightshift */
239 1, /* size */
240 16, /* bitsize */
241 FALSE, /* pc_relative */
242 0, /* bitpos */
243 complain_overflow_bitfield,/* complain_on_overflow */
244 bfd_elf_generic_reloc, /* special_function */
245 "R_CRX_ABS16", /* name */
246 FALSE, /* partial_inplace */
247 0x0, /* src_mask */
248 0xffff, /* dst_mask */
249 FALSE), /* pcrel_offset */
250
251 HOWTO (R_CRX_ABS32, /* type */
252 0, /* rightshift */
253 2, /* size */
254 32, /* bitsize */
255 FALSE, /* pc_relative */
256 0, /* bitpos */
257 complain_overflow_bitfield,/* complain_on_overflow */
258 bfd_elf_generic_reloc, /* special_function */
259 "R_CRX_ABS32", /* name */
260 FALSE, /* partial_inplace */
261 0x0, /* src_mask */
262 0xffffffff, /* dst_mask */
263 FALSE), /* pcrel_offset */
264
265 HOWTO (R_CRX_NUM8, /* type */
266 0, /* rightshift */
267 0, /* size */
268 8, /* bitsize */
269 FALSE, /* pc_relative */
270 0, /* bitpos */
271 complain_overflow_bitfield,/* complain_on_overflow */
272 bfd_elf_generic_reloc, /* special_function */
273 "R_CRX_NUM8", /* name */
274 FALSE, /* partial_inplace */
275 0x0, /* src_mask */
276 0xff, /* dst_mask */
277 FALSE), /* pcrel_offset */
278
279 HOWTO (R_CRX_NUM16, /* type */
280 0, /* rightshift */
281 1, /* size */
282 16, /* bitsize */
283 FALSE, /* pc_relative */
284 0, /* bitpos */
285 complain_overflow_bitfield,/* complain_on_overflow */
286 bfd_elf_generic_reloc, /* special_function */
287 "R_CRX_NUM16", /* name */
288 FALSE, /* partial_inplace */
289 0x0, /* src_mask */
290 0xffff, /* dst_mask */
291 FALSE), /* pcrel_offset */
292
293 HOWTO (R_CRX_NUM32, /* type */
294 0, /* rightshift */
295 2, /* size */
296 32, /* bitsize */
297 FALSE, /* pc_relative */
298 0, /* bitpos */
299 complain_overflow_bitfield,/* complain_on_overflow */
300 bfd_elf_generic_reloc, /* special_function */
301 "R_CRX_NUM32", /* name */
302 FALSE, /* partial_inplace */
303 0x0, /* src_mask */
304 0xffffffff, /* dst_mask */
305 FALSE), /* pcrel_offset */
306
307 HOWTO (R_CRX_IMM16, /* type */
308 0, /* rightshift */
309 1, /* size */
310 16, /* bitsize */
311 FALSE, /* pc_relative */
312 0, /* bitpos */
313 complain_overflow_bitfield,/* complain_on_overflow */
314 bfd_elf_generic_reloc, /* special_function */
315 "R_CRX_IMM16", /* name */
316 FALSE, /* partial_inplace */
317 0x0, /* src_mask */
318 0xffff, /* dst_mask */
319 FALSE), /* pcrel_offset */
320
321 HOWTO (R_CRX_IMM32, /* type */
322 0, /* rightshift */
323 2, /* size */
324 32, /* bitsize */
325 FALSE, /* pc_relative */
326 0, /* bitpos */
327 complain_overflow_bitfield,/* complain_on_overflow */
328 bfd_elf_generic_reloc, /* special_function */
329 "R_CRX_IMM32", /* name */
330 FALSE, /* partial_inplace */
331 0x0, /* src_mask */
332 0xffffffff, /* dst_mask */
333 FALSE), /* pcrel_offset */
334
335 /* An 8 bit switch table entry. This is generated for an expression
336 such as ``.byte L1 - L2''. The offset holds the difference
337 between the reloc address and L2. */
338 HOWTO (R_CRX_SWITCH8, /* type */
339 0, /* rightshift */
340 0, /* size (0 = byte, 1 = short, 2 = long) */
341 8, /* bitsize */
342 FALSE, /* pc_relative */
343 0, /* bitpos */
344 complain_overflow_unsigned, /* complain_on_overflow */
345 bfd_elf_generic_reloc, /* special_function */
346 "R_CRX_SWITCH8", /* name */
347 FALSE, /* partial_inplace */
348 0x0, /* src_mask */
349 0xff, /* dst_mask */
350 TRUE), /* pcrel_offset */
351
352 /* A 16 bit switch table entry. This is generated for an expression
353 such as ``.word L1 - L2''. The offset holds the difference
354 between the reloc address and L2. */
355 HOWTO (R_CRX_SWITCH16, /* type */
356 0, /* rightshift */
357 1, /* size (0 = byte, 1 = short, 2 = long) */
358 16, /* bitsize */
359 FALSE, /* pc_relative */
360 0, /* bitpos */
361 complain_overflow_unsigned, /* complain_on_overflow */
362 bfd_elf_generic_reloc, /* special_function */
363 "R_CRX_SWITCH16", /* name */
364 FALSE, /* partial_inplace */
365 0x0, /* src_mask */
366 0xffff, /* dst_mask */
367 TRUE), /* pcrel_offset */
368
369 /* A 32 bit switch table entry. This is generated for an expression
370 such as ``.long L1 - L2''. The offset holds the difference
371 between the reloc address and L2. */
372 HOWTO (R_CRX_SWITCH32, /* type */
373 0, /* rightshift */
374 2, /* size (0 = byte, 1 = short, 2 = long) */
375 32, /* bitsize */
376 FALSE, /* pc_relative */
377 0, /* bitpos */
378 complain_overflow_unsigned, /* complain_on_overflow */
379 bfd_elf_generic_reloc, /* special_function */
380 "R_CRX_SWITCH32", /* name */
381 FALSE, /* partial_inplace */
382 0x0, /* src_mask */
383 0xffffffff, /* dst_mask */
384 TRUE) /* pcrel_offset */
385 };
386
387 /* Retrieve a howto ptr using a BFD reloc_code. */
388
389 static reloc_howto_type *
elf_crx_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)390 elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
391 bfd_reloc_code_real_type code)
392 {
393 unsigned int i;
394
395 for (i = 0; i < R_CRX_MAX; i++)
396 if (code == crx_reloc_map[i].bfd_reloc_enum)
397 return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type];
398
399 printf ("This relocation Type is not supported -0x%x\n", code);
400 return 0;
401 }
402
403 static reloc_howto_type *
elf_crx_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)404 elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
405 const char *r_name)
406 {
407 unsigned int i;
408
409 for (i = 0;
410 i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]);
411 i++)
412 if (crx_elf_howto_table[i].name != NULL
413 && strcasecmp (crx_elf_howto_table[i].name, r_name) == 0)
414 return &crx_elf_howto_table[i];
415
416 return NULL;
417 }
418
419 /* Retrieve a howto ptr using an internal relocation entry. */
420
421 static void
elf_crx_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)422 elf_crx_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
423 Elf_Internal_Rela *dst)
424 {
425 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
426 if (r_type >= R_CRX_MAX)
427 {
428 (*_bfd_error_handler) (_("%B: unrecognised CRX reloc number: %d"),
429 abfd, r_type);
430 bfd_set_error (bfd_error_bad_value);
431 r_type = R_CRX_NONE;
432 }
433 cache_ptr->howto = &crx_elf_howto_table[r_type];
434 }
435
436 /* Perform a relocation as part of a final link. */
437
438 static bfd_reloc_status_type
crx_elf_final_link_relocate(reloc_howto_type * howto,bfd * input_bfd,bfd * output_bfd ATTRIBUTE_UNUSED,asection * input_section,bfd_byte * contents,bfd_vma offset,bfd_vma Rvalue,bfd_vma addend,struct bfd_link_info * info ATTRIBUTE_UNUSED,asection * sec ATTRIBUTE_UNUSED,int is_local ATTRIBUTE_UNUSED)439 crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd,
440 bfd *output_bfd ATTRIBUTE_UNUSED,
441 asection *input_section, bfd_byte *contents,
442 bfd_vma offset, bfd_vma Rvalue, bfd_vma addend,
443 struct bfd_link_info *info ATTRIBUTE_UNUSED,
444 asection *sec ATTRIBUTE_UNUSED,
445 int is_local ATTRIBUTE_UNUSED)
446 {
447 unsigned short r_type = howto->type;
448 bfd_byte *hit_data = contents + offset;
449 bfd_vma reloc_bits, check;
450
451 switch (r_type)
452 {
453 case R_CRX_IMM16:
454 case R_CRX_IMM32:
455 case R_CRX_ABS16:
456 case R_CRX_ABS32:
457 case R_CRX_REL8_CMP:
458 case R_CRX_REL16:
459 case R_CRX_REL24:
460 case R_CRX_REL32:
461 case R_CRX_REGREL12:
462 case R_CRX_REGREL22:
463 case R_CRX_REGREL28:
464 case R_CRX_REGREL32:
465 /* 'hit_data' is relative to the start of the instruction, not the
466 relocation offset. Advance it to account for the exact offset. */
467 hit_data += 2;
468 break;
469
470 case R_CRX_REL4:
471 /* This relocation type is used only in 'Branch if Equal to 0'
472 instructions and requires special handling. */
473 Rvalue -= 1;
474 break;
475
476 case R_CRX_NONE:
477 return bfd_reloc_ok;
478 break;
479
480 case R_CRX_SWITCH8:
481 case R_CRX_SWITCH16:
482 case R_CRX_SWITCH32:
483 /* We only care about the addend, where the difference between
484 expressions is kept. */
485 Rvalue = 0;
486
487 default:
488 break;
489 }
490
491 if (howto->pc_relative)
492 {
493 /* Subtract the address of the section containing the location. */
494 Rvalue -= (input_section->output_section->vma
495 + input_section->output_offset);
496 /* Subtract the position of the location within the section. */
497 Rvalue -= offset;
498 }
499
500 /* Add in supplied addend. */
501 Rvalue += addend;
502
503 /* Complain if the bitfield overflows, whether it is considered
504 as signed or unsigned. */
505 check = Rvalue >> howto->rightshift;
506
507 /* Assumes two's complement. This expression avoids
508 overflow if howto->bitsize is the number of bits in
509 bfd_vma. */
510 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
511
512 if (((bfd_vma) check & ~reloc_bits) != 0
513 && (((bfd_vma) check & ~reloc_bits)
514 != (-(bfd_vma) 1 & ~reloc_bits)))
515 {
516 /* The above right shift is incorrect for a signed
517 value. See if turning on the upper bits fixes the
518 overflow. */
519 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
520 {
521 check |= ((bfd_vma) - 1
522 & ~((bfd_vma) - 1
523 >> howto->rightshift));
524 if (((bfd_vma) check & ~reloc_bits)
525 != (-(bfd_vma) 1 & ~reloc_bits))
526 return bfd_reloc_overflow;
527 }
528 else
529 return bfd_reloc_overflow;
530 }
531
532 /* Drop unwanted bits from the value we are relocating to. */
533 Rvalue >>= (bfd_vma) howto->rightshift;
534
535 /* Apply dst_mask to select only relocatable part of the insn. */
536 Rvalue &= howto->dst_mask;
537
538 switch (howto->size)
539 {
540 case 0:
541 if (r_type == R_CRX_REL4)
542 {
543 Rvalue <<= 4;
544 Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f);
545 }
546
547 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
548 break;
549
550 case 1:
551 if (r_type == R_CRX_REGREL12)
552 Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000);
553
554 bfd_put_16 (input_bfd, Rvalue, hit_data);
555 break;
556
557 case 2:
558 if (r_type == R_CRX_REL24
559 || r_type == R_CRX_REGREL22
560 || r_type == R_CRX_REGREL28)
561 Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) |
562 bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask);
563
564 if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32)
565 /* Relocation on DATA is purely little-endian, that is, for a
566 multi-byte datum, the lowest address in memory contains the
567 little end of the datum, that is, the least significant byte.
568 Therefore we use BFD's byte Putting functions. */
569 bfd_put_32 (input_bfd, Rvalue, hit_data);
570 else
571 /* Relocation on INSTRUCTIONS is different : Instructions are
572 word-addressable, that is, each word itself is arranged according
573 to little-endian convention, whereas the words are arranged with
574 respect to one another in BIG ENDIAN fashion.
575 When there is an immediate value that spans a word boundary, it is
576 split in a big-endian way with respect to the words. */
577 {
578 bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data);
579 bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2);
580 }
581 break;
582
583 default:
584 return bfd_reloc_notsupported;
585 }
586
587 return bfd_reloc_ok;
588 }
589
590 /* Delete some bytes from a section while relaxing. */
591
592 static bfd_boolean
elf32_crx_relax_delete_bytes(struct bfd_link_info * link_info,bfd * abfd,asection * sec,bfd_vma addr,int count)593 elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd,
594 asection *sec, bfd_vma addr, int count)
595 {
596 Elf_Internal_Shdr *symtab_hdr;
597 unsigned int sec_shndx;
598 bfd_byte *contents;
599 Elf_Internal_Rela *irel, *irelend;
600 bfd_vma toaddr;
601 Elf_Internal_Sym *isym;
602 Elf_Internal_Sym *isymend;
603 struct elf_link_hash_entry **sym_hashes;
604 struct elf_link_hash_entry **end_hashes;
605 struct elf_link_hash_entry **start_hashes;
606 unsigned int symcount;
607
608 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
609
610 contents = elf_section_data (sec)->this_hdr.contents;
611
612 toaddr = sec->size;
613
614 irel = elf_section_data (sec)->relocs;
615 irelend = irel + sec->reloc_count;
616
617 /* Actually delete the bytes. */
618 memmove (contents + addr, contents + addr + count,
619 (size_t) (toaddr - addr - count));
620 sec->size -= count;
621
622 /* Adjust all the relocs. */
623 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
624 {
625 /* Get the new reloc address. */
626 if ((irel->r_offset > addr
627 && irel->r_offset < toaddr))
628 irel->r_offset -= count;
629 }
630
631 /* Adjust the local symbols defined in this section. */
632 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
633 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
634 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
635 {
636 if (isym->st_shndx == sec_shndx
637 && isym->st_value > addr
638 && isym->st_value < toaddr)
639 {
640 /* Adjust the addend of SWITCH relocations in this section,
641 which reference this local symbol. */
642 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
643 {
644 unsigned long r_symndx;
645 Elf_Internal_Sym *rsym;
646 bfd_vma addsym, subsym;
647
648 /* Skip if not a SWITCH relocation. */
649 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8
650 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16
651 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32)
652 continue;
653
654 r_symndx = ELF32_R_SYM (irel->r_info);
655 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
656
657 /* Skip if not the local adjusted symbol. */
658 if (rsym != isym)
659 continue;
660
661 addsym = isym->st_value;
662 subsym = addsym - irel->r_addend;
663
664 /* Fix the addend only when -->> (addsym > addr >= subsym). */
665 if (subsym <= addr)
666 irel->r_addend -= count;
667 else
668 continue;
669 }
670
671 isym->st_value -= count;
672 }
673 }
674
675 /* Now adjust the global symbols defined in this section. */
676 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
677 - symtab_hdr->sh_info);
678 sym_hashes = start_hashes = elf_sym_hashes (abfd);
679 end_hashes = sym_hashes + symcount;
680
681 for (; sym_hashes < end_hashes; sym_hashes++)
682 {
683 struct elf_link_hash_entry *sym_hash = *sym_hashes;
684
685 /* The '--wrap SYMBOL' option is causing a pain when the object file,
686 containing the definition of __wrap_SYMBOL, includes a direct
687 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
688 the same symbol (which is __wrap_SYMBOL), but still exist as two
689 different symbols in 'sym_hashes', we don't want to adjust
690 the global symbol __wrap_SYMBOL twice.
691 This check is only relevant when symbols are being wrapped. */
692 if (link_info->wrap_hash != NULL)
693 {
694 struct elf_link_hash_entry **cur_sym_hashes;
695
696 /* Loop only over the symbols whom been already checked. */
697 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
698 cur_sym_hashes++)
699 {
700 /* If the current symbol is identical to 'sym_hash', that means
701 the symbol was already adjusted (or at least checked). */
702 if (*cur_sym_hashes == sym_hash)
703 break;
704 }
705 /* Don't adjust the symbol again. */
706 if (cur_sym_hashes < sym_hashes)
707 continue;
708 }
709
710 if ((sym_hash->root.type == bfd_link_hash_defined
711 || sym_hash->root.type == bfd_link_hash_defweak)
712 && sym_hash->root.u.def.section == sec
713 && sym_hash->root.u.def.value > addr
714 && sym_hash->root.u.def.value < toaddr)
715 sym_hash->root.u.def.value -= count;
716 }
717
718 return TRUE;
719 }
720
721 /* This is a version of bfd_generic_get_relocated_section_contents
722 which uses elf32_crx_relocate_section. */
723
724 static bfd_byte *
elf32_crx_get_relocated_section_contents(bfd * output_bfd,struct bfd_link_info * link_info,struct bfd_link_order * link_order,bfd_byte * data,bfd_boolean relocatable,asymbol ** symbols)725 elf32_crx_get_relocated_section_contents (bfd *output_bfd,
726 struct bfd_link_info *link_info,
727 struct bfd_link_order *link_order,
728 bfd_byte *data,
729 bfd_boolean relocatable,
730 asymbol **symbols)
731 {
732 Elf_Internal_Shdr *symtab_hdr;
733 asection *input_section = link_order->u.indirect.section;
734 bfd *input_bfd = input_section->owner;
735 asection **sections = NULL;
736 Elf_Internal_Rela *internal_relocs = NULL;
737 Elf_Internal_Sym *isymbuf = NULL;
738
739 /* We only need to handle the case of relaxing, or of having a
740 particular set of section contents, specially. */
741 if (relocatable
742 || elf_section_data (input_section)->this_hdr.contents == NULL)
743 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
744 link_order, data,
745 relocatable,
746 symbols);
747
748 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
749
750 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
751 (size_t) input_section->size);
752
753 if ((input_section->flags & SEC_RELOC) != 0
754 && input_section->reloc_count > 0)
755 {
756 Elf_Internal_Sym *isym;
757 Elf_Internal_Sym *isymend;
758 asection **secpp;
759 bfd_size_type amt;
760
761 internal_relocs = (_bfd_elf_link_read_relocs
762 (input_bfd, input_section, NULL,
763 (Elf_Internal_Rela *) NULL, FALSE));
764 if (internal_relocs == NULL)
765 goto error_return;
766
767 if (symtab_hdr->sh_info != 0)
768 {
769 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
770 if (isymbuf == NULL)
771 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
772 symtab_hdr->sh_info, 0,
773 NULL, NULL, NULL);
774 if (isymbuf == NULL)
775 goto error_return;
776 }
777
778 amt = symtab_hdr->sh_info;
779 amt *= sizeof (asection *);
780 sections = bfd_malloc (amt);
781 if (sections == NULL && amt != 0)
782 goto error_return;
783
784 isymend = isymbuf + symtab_hdr->sh_info;
785 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
786 {
787 asection *isec;
788
789 if (isym->st_shndx == SHN_UNDEF)
790 isec = bfd_und_section_ptr;
791 else if (isym->st_shndx == SHN_ABS)
792 isec = bfd_abs_section_ptr;
793 else if (isym->st_shndx == SHN_COMMON)
794 isec = bfd_com_section_ptr;
795 else
796 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
797
798 *secpp = isec;
799 }
800
801 if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd,
802 input_section, data, internal_relocs,
803 isymbuf, sections))
804 goto error_return;
805
806 if (sections != NULL)
807 free (sections);
808 if (isymbuf != NULL
809 && symtab_hdr->contents != (unsigned char *) isymbuf)
810 free (isymbuf);
811 if (elf_section_data (input_section)->relocs != internal_relocs)
812 free (internal_relocs);
813 }
814
815 return data;
816
817 error_return:
818 if (sections != NULL)
819 free (sections);
820 if (isymbuf != NULL
821 && symtab_hdr->contents != (unsigned char *) isymbuf)
822 free (isymbuf);
823 if (internal_relocs != NULL
824 && elf_section_data (input_section)->relocs != internal_relocs)
825 free (internal_relocs);
826 return NULL;
827 }
828
829 /* Relocate a CRX ELF section. */
830
831 static bfd_boolean
elf32_crx_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)832 elf32_crx_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
833 bfd *input_bfd, asection *input_section,
834 bfd_byte *contents, Elf_Internal_Rela *relocs,
835 Elf_Internal_Sym *local_syms,
836 asection **local_sections)
837 {
838 Elf_Internal_Shdr *symtab_hdr;
839 struct elf_link_hash_entry **sym_hashes;
840 Elf_Internal_Rela *rel, *relend;
841
842 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
843 sym_hashes = elf_sym_hashes (input_bfd);
844
845 rel = relocs;
846 relend = relocs + input_section->reloc_count;
847 for (; rel < relend; rel++)
848 {
849 int r_type;
850 reloc_howto_type *howto;
851 unsigned long r_symndx;
852 Elf_Internal_Sym *sym;
853 asection *sec;
854 struct elf_link_hash_entry *h;
855 bfd_vma relocation;
856 bfd_reloc_status_type r;
857
858 r_symndx = ELF32_R_SYM (rel->r_info);
859 r_type = ELF32_R_TYPE (rel->r_info);
860 howto = crx_elf_howto_table + (r_type);
861
862 h = NULL;
863 sym = NULL;
864 sec = NULL;
865 if (r_symndx < symtab_hdr->sh_info)
866 {
867 sym = local_syms + r_symndx;
868 sec = local_sections[r_symndx];
869 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
870 }
871 else
872 {
873 bfd_boolean unresolved_reloc, warned, ignored;
874
875 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
876 r_symndx, symtab_hdr, sym_hashes,
877 h, sec, relocation,
878 unresolved_reloc, warned, ignored);
879 }
880
881 if (sec != NULL && discarded_section (sec))
882 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
883 rel, 1, relend, howto, 0, contents);
884
885 if (bfd_link_relocatable (info))
886 continue;
887
888 r = crx_elf_final_link_relocate (howto, input_bfd, output_bfd,
889 input_section,
890 contents, rel->r_offset,
891 relocation, rel->r_addend,
892 info, sec, h == NULL);
893
894 if (r != bfd_reloc_ok)
895 {
896 const char *name;
897 const char *msg = (const char *) 0;
898
899 if (h != NULL)
900 name = h->root.root.string;
901 else
902 {
903 name = (bfd_elf_string_from_elf_section
904 (input_bfd, symtab_hdr->sh_link, sym->st_name));
905 if (name == NULL || *name == '\0')
906 name = bfd_section_name (input_bfd, sec);
907 }
908
909 switch (r)
910 {
911 case bfd_reloc_overflow:
912 (*info->callbacks->reloc_overflow)
913 (info, (h ? &h->root : NULL), name, howto->name,
914 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
915 break;
916
917 case bfd_reloc_undefined:
918 (*info->callbacks->undefined_symbol)
919 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
920 break;
921
922 case bfd_reloc_outofrange:
923 msg = _("internal error: out of range error");
924 goto common_error;
925
926 case bfd_reloc_notsupported:
927 msg = _("internal error: unsupported relocation error");
928 goto common_error;
929
930 case bfd_reloc_dangerous:
931 msg = _("internal error: dangerous error");
932 goto common_error;
933
934 default:
935 msg = _("internal error: unknown error");
936 /* Fall through. */
937
938 common_error:
939 (*info->callbacks->warning) (info, msg, name, input_bfd,
940 input_section, rel->r_offset);
941 break;
942 }
943 }
944 }
945
946 return TRUE;
947 }
948
949 /* This function handles relaxing for the CRX.
950
951 There's quite a few relaxing opportunites available on the CRX:
952
953 * bal/bcond:32 -> bal/bcond:16 2 bytes
954 * bcond:16 -> bcond:8 2 bytes
955 * cmpbcond:24 -> cmpbcond:8 2 bytes
956 * arithmetic imm32 -> arithmetic imm16 2 bytes
957
958 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
959
960 static bfd_boolean
elf32_crx_relax_section(bfd * abfd,asection * sec,struct bfd_link_info * link_info,bfd_boolean * again)961 elf32_crx_relax_section (bfd *abfd, asection *sec,
962 struct bfd_link_info *link_info, bfd_boolean *again)
963 {
964 Elf_Internal_Shdr *symtab_hdr;
965 Elf_Internal_Rela *internal_relocs;
966 Elf_Internal_Rela *irel, *irelend;
967 bfd_byte *contents = NULL;
968 Elf_Internal_Sym *isymbuf = NULL;
969
970 /* Assume nothing changes. */
971 *again = FALSE;
972
973 /* We don't have to do anything for a relocatable link, if
974 this section does not have relocs, or if this is not a
975 code section. */
976 if (bfd_link_relocatable (link_info)
977 || (sec->flags & SEC_RELOC) == 0
978 || sec->reloc_count == 0
979 || (sec->flags & SEC_CODE) == 0)
980 return TRUE;
981
982 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
983
984 /* Get a copy of the native relocations. */
985 internal_relocs = (_bfd_elf_link_read_relocs
986 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
987 link_info->keep_memory));
988 if (internal_relocs == NULL)
989 goto error_return;
990
991 /* Walk through them looking for relaxing opportunities. */
992 irelend = internal_relocs + sec->reloc_count;
993 for (irel = internal_relocs; irel < irelend; irel++)
994 {
995 bfd_vma symval;
996
997 /* If this isn't something that can be relaxed, then ignore
998 this reloc. */
999 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL32
1000 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16
1001 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24
1002 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32)
1003 continue;
1004
1005 /* Get the section contents if we haven't done so already. */
1006 if (contents == NULL)
1007 {
1008 /* Get cached copy if it exists. */
1009 if (elf_section_data (sec)->this_hdr.contents != NULL)
1010 contents = elf_section_data (sec)->this_hdr.contents;
1011 /* Go get them off disk. */
1012 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1013 goto error_return;
1014 }
1015
1016 /* Read this BFD's local symbols if we haven't done so already. */
1017 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
1018 {
1019 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1020 if (isymbuf == NULL)
1021 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1022 symtab_hdr->sh_info, 0,
1023 NULL, NULL, NULL);
1024 if (isymbuf == NULL)
1025 goto error_return;
1026 }
1027
1028 /* Get the value of the symbol referred to by the reloc. */
1029 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1030 {
1031 /* A local symbol. */
1032 Elf_Internal_Sym *isym;
1033 asection *sym_sec;
1034
1035 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1036 if (isym->st_shndx == SHN_UNDEF)
1037 sym_sec = bfd_und_section_ptr;
1038 else if (isym->st_shndx == SHN_ABS)
1039 sym_sec = bfd_abs_section_ptr;
1040 else if (isym->st_shndx == SHN_COMMON)
1041 sym_sec = bfd_com_section_ptr;
1042 else
1043 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1044 symval = (isym->st_value
1045 + sym_sec->output_section->vma
1046 + sym_sec->output_offset);
1047 }
1048 else
1049 {
1050 unsigned long indx;
1051 struct elf_link_hash_entry *h;
1052
1053 /* An external symbol. */
1054 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1055 h = elf_sym_hashes (abfd)[indx];
1056 BFD_ASSERT (h != NULL);
1057
1058 if (h->root.type != bfd_link_hash_defined
1059 && h->root.type != bfd_link_hash_defweak)
1060 /* This appears to be a reference to an undefined
1061 symbol. Just ignore it--it will be caught by the
1062 regular reloc processing. */
1063 continue;
1064
1065 symval = (h->root.u.def.value
1066 + h->root.u.def.section->output_section->vma
1067 + h->root.u.def.section->output_offset);
1068 }
1069
1070 /* For simplicity of coding, we are going to modify the section
1071 contents, the section relocs, and the BFD symbol table. We
1072 must tell the rest of the code not to free up this
1073 information. It would be possible to instead create a table
1074 of changes which have to be made, as is done in coff-mips.c;
1075 that would be more work, but would require less memory when
1076 the linker is run. */
1077
1078 /* Try to turn a 32bit pc-relative branch/call into
1079 a 16bit pc-relative branch/call. */
1080 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32)
1081 {
1082 bfd_vma value = symval;
1083
1084 /* Deal with pc-relative gunk. */
1085 value -= (sec->output_section->vma + sec->output_offset);
1086 value -= irel->r_offset;
1087 value += irel->r_addend;
1088
1089 /* See if the value will fit in 16 bits, note the high value is
1090 0xfffe + 2 as the target will be two bytes closer if we are
1091 able to relax. */
1092 if ((long) value < 0x10000 && (long) value > -0x10002)
1093 {
1094 unsigned short code;
1095
1096 /* Get the opcode. */
1097 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1098
1099 /* Verify it's a 'bal'/'bcond' and fix the opcode. */
1100 if ((code & 0xfff0) == 0x3170)
1101 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1102 else if ((code & 0xf0ff) == 0x707f)
1103 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset);
1104 else
1105 continue;
1106
1107 /* Note that we've changed the relocs, section contents, etc. */
1108 elf_section_data (sec)->relocs = internal_relocs;
1109 elf_section_data (sec)->this_hdr.contents = contents;
1110 symtab_hdr->contents = (unsigned char *) isymbuf;
1111
1112 /* Fix the relocation's type. */
1113 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1114 R_CRX_REL16);
1115
1116 /* Delete two bytes of data. */
1117 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1118 irel->r_offset + 2, 2))
1119 goto error_return;
1120
1121 /* That will change things, so, we should relax again.
1122 Note that this is not required, and it may be slow. */
1123 *again = TRUE;
1124 }
1125 }
1126
1127 /* Try to turn a 16bit pc-relative branch into an
1128 8bit pc-relative branch. */
1129 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL16)
1130 {
1131 bfd_vma value = symval;
1132
1133 /* Deal with pc-relative gunk. */
1134 value -= (sec->output_section->vma + sec->output_offset);
1135 value -= irel->r_offset;
1136 value += irel->r_addend;
1137
1138 /* See if the value will fit in 8 bits, note the high value is
1139 0xfc + 2 as the target will be two bytes closer if we are
1140 able to relax. */
1141 if ((long) value < 0xfe && (long) value > -0x100)
1142 {
1143 unsigned short code;
1144
1145 /* Get the opcode. */
1146 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1147
1148 /* Verify it's a 'bcond' opcode. */
1149 if ((code & 0xf0ff) != 0x707e)
1150 continue;
1151
1152 /* Note that we've changed the relocs, section contents, etc. */
1153 elf_section_data (sec)->relocs = internal_relocs;
1154 elf_section_data (sec)->this_hdr.contents = contents;
1155 symtab_hdr->contents = (unsigned char *) isymbuf;
1156
1157 /* Fix the relocation's type. */
1158 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1159 R_CRX_REL8);
1160
1161 /* Delete two bytes of data. */
1162 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1163 irel->r_offset + 2, 2))
1164 goto error_return;
1165
1166 /* That will change things, so, we should relax again.
1167 Note that this is not required, and it may be slow. */
1168 *again = TRUE;
1169 }
1170 }
1171
1172 /* Try to turn a 24bit pc-relative cmp&branch into
1173 an 8bit pc-relative cmp&branch. */
1174 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24)
1175 {
1176 bfd_vma value = symval;
1177
1178 /* Deal with pc-relative gunk. */
1179 value -= (sec->output_section->vma + sec->output_offset);
1180 value -= irel->r_offset;
1181 value += irel->r_addend;
1182
1183 /* See if the value will fit in 8 bits, note the high value is
1184 0x7e + 2 as the target will be two bytes closer if we are
1185 able to relax. */
1186 if ((long) value < 0x100 && (long) value > -0x100)
1187 {
1188 unsigned short code;
1189
1190 /* Get the opcode. */
1191 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1192
1193 /* Verify it's a 'cmp&branch' opcode. */
1194 if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190
1195 && (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0
1196 && (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0
1197 /* Or a Co-processor branch ('bcop'). */
1198 && (code & 0xfff0) != 0x3010 && (code & 0xfff0) != 0x3110)
1199 continue;
1200
1201 /* Note that we've changed the relocs, section contents, etc. */
1202 elf_section_data (sec)->relocs = internal_relocs;
1203 elf_section_data (sec)->this_hdr.contents = contents;
1204 symtab_hdr->contents = (unsigned char *) isymbuf;
1205
1206 /* Fix the opcode. */
1207 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1208
1209 /* Fix the relocation's type. */
1210 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1211 R_CRX_REL8_CMP);
1212
1213 /* Delete two bytes of data. */
1214 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1215 irel->r_offset + 4, 2))
1216 goto error_return;
1217
1218 /* That will change things, so, we should relax again.
1219 Note that this is not required, and it may be slow. */
1220 *again = TRUE;
1221 }
1222 }
1223
1224 /* Try to turn a 32bit immediate address into
1225 a 16bit immediate address. */
1226 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32)
1227 {
1228 bfd_vma value = symval;
1229
1230 /* See if the value will fit in 16 bits. */
1231 if ((long) value < 0x7fff && (long) value > -0x8000)
1232 {
1233 unsigned short code;
1234
1235 /* Get the opcode. */
1236 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1237
1238 /* Verify it's a 'arithmetic double'. */
1239 if ((code & 0xf0f0) != 0x20f0)
1240 continue;
1241
1242 /* Note that we've changed the relocs, section contents, etc. */
1243 elf_section_data (sec)->relocs = internal_relocs;
1244 elf_section_data (sec)->this_hdr.contents = contents;
1245 symtab_hdr->contents = (unsigned char *) isymbuf;
1246
1247 /* Fix the opcode. */
1248 bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
1249
1250 /* Fix the relocation's type. */
1251 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1252 R_CRX_IMM16);
1253
1254 /* Delete two bytes of data. */
1255 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1256 irel->r_offset + 2, 2))
1257 goto error_return;
1258
1259 /* That will change things, so, we should relax again.
1260 Note that this is not required, and it may be slow. */
1261 *again = TRUE;
1262 }
1263 }
1264 }
1265
1266 if (isymbuf != NULL
1267 && symtab_hdr->contents != (unsigned char *) isymbuf)
1268 {
1269 if (! link_info->keep_memory)
1270 free (isymbuf);
1271 else
1272 {
1273 /* Cache the symbols for elf_link_input_bfd. */
1274 symtab_hdr->contents = (unsigned char *) isymbuf;
1275 }
1276 }
1277
1278 if (contents != NULL
1279 && elf_section_data (sec)->this_hdr.contents != contents)
1280 {
1281 if (! link_info->keep_memory)
1282 free (contents);
1283 else
1284 {
1285 /* Cache the section contents for elf_link_input_bfd. */
1286 elf_section_data (sec)->this_hdr.contents = contents;
1287 }
1288 }
1289
1290 if (internal_relocs != NULL
1291 && elf_section_data (sec)->relocs != internal_relocs)
1292 free (internal_relocs);
1293
1294 return TRUE;
1295
1296 error_return:
1297 if (isymbuf != NULL
1298 && symtab_hdr->contents != (unsigned char *) isymbuf)
1299 free (isymbuf);
1300 if (contents != NULL
1301 && elf_section_data (sec)->this_hdr.contents != contents)
1302 free (contents);
1303 if (internal_relocs != NULL
1304 && elf_section_data (sec)->relocs != internal_relocs)
1305 free (internal_relocs);
1306
1307 return FALSE;
1308 }
1309
1310 /* Definitions for setting CRX target vector. */
1311 #define TARGET_LITTLE_SYM crx_elf32_vec
1312 #define TARGET_LITTLE_NAME "elf32-crx"
1313 #define ELF_ARCH bfd_arch_crx
1314 #define ELF_MACHINE_CODE EM_CRX
1315 #define ELF_MAXPAGESIZE 0x1
1316 #define elf_symbol_leading_char '_'
1317
1318 #define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup
1319 #define bfd_elf32_bfd_reloc_name_lookup \
1320 elf_crx_reloc_name_lookup
1321 #define elf_info_to_howto elf_crx_info_to_howto
1322 #define elf_info_to_howto_rel 0
1323 #define elf_backend_relocate_section elf32_crx_relocate_section
1324 #define bfd_elf32_bfd_relax_section elf32_crx_relax_section
1325 #define bfd_elf32_bfd_get_relocated_section_contents \
1326 elf32_crx_get_relocated_section_contents
1327 #define elf_backend_can_gc_sections 1
1328 #define elf_backend_rela_normal 1
1329
1330 #include "elf32-target.h"
1331