1 /* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999-2016 Free Software Foundation, Inc.
3 Contributed by Denis Chertykov <denisc@overta.ru>
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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,
20 Boston, MA 02110-1301, USA. */
27 #include "elf32-avr.h"
28 #include "bfd_stdint.h"
30 /* Enable debugging printout at stdout with this variable. */
31 static bfd_boolean debug_relax
= FALSE
;
33 /* Enable debugging printout at stdout with this variable. */
34 static bfd_boolean debug_stubs
= FALSE
;
36 static bfd_reloc_status_type
37 bfd_elf_avr_diff_reloc (bfd
*, arelent
*, asymbol
*, void *,
38 asection
*, bfd
*, char **);
40 /* Hash table initialization and handling. Code is taken from the hppa port
41 and adapted to the needs of AVR. */
43 /* We use two hash tables to hold information for linking avr objects.
45 The first is the elf32_avr_link_hash_table which is derived from the
46 stanard ELF linker hash table. We use this as a place to attach the other
47 hash table and some static information.
49 The second is the stub hash table which is derived from the base BFD
50 hash table. The stub hash table holds the information on the linker
53 struct elf32_avr_stub_hash_entry
55 /* Base hash table entry structure. */
56 struct bfd_hash_entry bh_root
;
58 /* Offset within stub_sec of the beginning of this stub. */
61 /* Given the symbol's value and its section we can determine its final
62 value when building the stubs (so the stub knows where to jump). */
65 /* This way we could mark stubs to be no longer necessary. */
66 bfd_boolean is_actually_needed
;
69 struct elf32_avr_link_hash_table
71 /* The main hash table. */
72 struct elf_link_hash_table etab
;
74 /* The stub hash table. */
75 struct bfd_hash_table bstab
;
79 /* Linker stub bfd. */
82 /* The stub section. */
85 /* Usually 0, unless we are generating code for a bootloader. Will
86 be initialized by elf32_avr_size_stubs to the vma offset of the
87 output section associated with the stub section. */
90 /* Assorted information used by elf32_avr_size_stubs. */
91 unsigned int bfd_count
;
92 unsigned int top_index
;
93 asection
** input_list
;
94 Elf_Internal_Sym
** all_local_syms
;
96 /* Tables for mapping vma beyond the 128k boundary to the address of the
97 corresponding stub. (AMT)
98 "amt_max_entry_cnt" reflects the number of entries that memory is allocated
99 for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
100 "amt_entry_cnt" informs how many of these entries actually contain
102 unsigned int amt_entry_cnt
;
103 unsigned int amt_max_entry_cnt
;
104 bfd_vma
* amt_stub_offsets
;
105 bfd_vma
* amt_destination_addr
;
108 /* Various hash macros and functions. */
109 #define avr_link_hash_table(p) \
110 /* PR 3874: Check that we have an AVR style hash table before using it. */\
111 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
112 == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL)
114 #define avr_stub_hash_entry(ent) \
115 ((struct elf32_avr_stub_hash_entry *)(ent))
117 #define avr_stub_hash_lookup(table, string, create, copy) \
118 ((struct elf32_avr_stub_hash_entry *) \
119 bfd_hash_lookup ((table), (string), (create), (copy)))
121 static reloc_howto_type elf_avr_howto_table
[] =
123 HOWTO (R_AVR_NONE
, /* type */
125 3, /* size (0 = byte, 1 = short, 2 = long) */
127 FALSE
, /* pc_relative */
129 complain_overflow_dont
, /* complain_on_overflow */
130 bfd_elf_generic_reloc
, /* special_function */
131 "R_AVR_NONE", /* name */
132 FALSE
, /* partial_inplace */
135 FALSE
), /* pcrel_offset */
137 HOWTO (R_AVR_32
, /* type */
139 2, /* size (0 = byte, 1 = short, 2 = long) */
141 FALSE
, /* pc_relative */
143 complain_overflow_bitfield
, /* complain_on_overflow */
144 bfd_elf_generic_reloc
, /* special_function */
145 "R_AVR_32", /* name */
146 FALSE
, /* partial_inplace */
147 0xffffffff, /* src_mask */
148 0xffffffff, /* dst_mask */
149 FALSE
), /* pcrel_offset */
151 /* A 7 bit PC relative relocation. */
152 HOWTO (R_AVR_7_PCREL
, /* type */
154 1, /* size (0 = byte, 1 = short, 2 = long) */
156 TRUE
, /* pc_relative */
158 complain_overflow_bitfield
, /* complain_on_overflow */
159 bfd_elf_generic_reloc
, /* special_function */
160 "R_AVR_7_PCREL", /* name */
161 FALSE
, /* partial_inplace */
162 0xffff, /* src_mask */
163 0xffff, /* dst_mask */
164 TRUE
), /* pcrel_offset */
166 /* A 13 bit PC relative relocation. */
167 HOWTO (R_AVR_13_PCREL
, /* type */
169 1, /* size (0 = byte, 1 = short, 2 = long) */
171 TRUE
, /* pc_relative */
173 complain_overflow_bitfield
, /* complain_on_overflow */
174 bfd_elf_generic_reloc
, /* special_function */
175 "R_AVR_13_PCREL", /* name */
176 FALSE
, /* partial_inplace */
177 0xfff, /* src_mask */
178 0xfff, /* dst_mask */
179 TRUE
), /* pcrel_offset */
181 /* A 16 bit absolute relocation. */
182 HOWTO (R_AVR_16
, /* type */
184 1, /* size (0 = byte, 1 = short, 2 = long) */
186 FALSE
, /* pc_relative */
188 complain_overflow_dont
, /* complain_on_overflow */
189 bfd_elf_generic_reloc
, /* special_function */
190 "R_AVR_16", /* name */
191 FALSE
, /* partial_inplace */
192 0xffff, /* src_mask */
193 0xffff, /* dst_mask */
194 FALSE
), /* pcrel_offset */
196 /* A 16 bit absolute relocation for command address
197 Will be changed when linker stubs are needed. */
198 HOWTO (R_AVR_16_PM
, /* type */
200 1, /* size (0 = byte, 1 = short, 2 = long) */
202 FALSE
, /* pc_relative */
204 complain_overflow_bitfield
, /* complain_on_overflow */
205 bfd_elf_generic_reloc
, /* special_function */
206 "R_AVR_16_PM", /* name */
207 FALSE
, /* partial_inplace */
208 0xffff, /* src_mask */
209 0xffff, /* dst_mask */
210 FALSE
), /* pcrel_offset */
211 /* A low 8 bit absolute relocation of 16 bit address.
213 HOWTO (R_AVR_LO8_LDI
, /* type */
215 1, /* size (0 = byte, 1 = short, 2 = long) */
217 FALSE
, /* pc_relative */
219 complain_overflow_dont
, /* complain_on_overflow */
220 bfd_elf_generic_reloc
, /* special_function */
221 "R_AVR_LO8_LDI", /* name */
222 FALSE
, /* partial_inplace */
223 0xffff, /* src_mask */
224 0xffff, /* dst_mask */
225 FALSE
), /* pcrel_offset */
226 /* A high 8 bit absolute relocation of 16 bit address.
228 HOWTO (R_AVR_HI8_LDI
, /* type */
230 1, /* size (0 = byte, 1 = short, 2 = long) */
232 FALSE
, /* pc_relative */
234 complain_overflow_dont
, /* complain_on_overflow */
235 bfd_elf_generic_reloc
, /* special_function */
236 "R_AVR_HI8_LDI", /* name */
237 FALSE
, /* partial_inplace */
238 0xffff, /* src_mask */
239 0xffff, /* dst_mask */
240 FALSE
), /* pcrel_offset */
241 /* A high 6 bit absolute relocation of 22 bit address.
242 For LDI command. As well second most significant 8 bit value of
243 a 32 bit link-time constant. */
244 HOWTO (R_AVR_HH8_LDI
, /* type */
246 1, /* size (0 = byte, 1 = short, 2 = long) */
248 FALSE
, /* pc_relative */
250 complain_overflow_dont
, /* complain_on_overflow */
251 bfd_elf_generic_reloc
, /* special_function */
252 "R_AVR_HH8_LDI", /* name */
253 FALSE
, /* partial_inplace */
254 0xffff, /* src_mask */
255 0xffff, /* dst_mask */
256 FALSE
), /* pcrel_offset */
257 /* A negative low 8 bit absolute relocation of 16 bit address.
259 HOWTO (R_AVR_LO8_LDI_NEG
, /* type */
261 1, /* size (0 = byte, 1 = short, 2 = long) */
263 FALSE
, /* pc_relative */
265 complain_overflow_dont
, /* complain_on_overflow */
266 bfd_elf_generic_reloc
, /* special_function */
267 "R_AVR_LO8_LDI_NEG", /* name */
268 FALSE
, /* partial_inplace */
269 0xffff, /* src_mask */
270 0xffff, /* dst_mask */
271 FALSE
), /* pcrel_offset */
272 /* A negative high 8 bit absolute relocation of 16 bit address.
274 HOWTO (R_AVR_HI8_LDI_NEG
, /* type */
276 1, /* size (0 = byte, 1 = short, 2 = long) */
278 FALSE
, /* pc_relative */
280 complain_overflow_dont
, /* complain_on_overflow */
281 bfd_elf_generic_reloc
, /* special_function */
282 "R_AVR_HI8_LDI_NEG", /* name */
283 FALSE
, /* partial_inplace */
284 0xffff, /* src_mask */
285 0xffff, /* dst_mask */
286 FALSE
), /* pcrel_offset */
287 /* A negative high 6 bit absolute relocation of 22 bit address.
289 HOWTO (R_AVR_HH8_LDI_NEG
, /* type */
291 1, /* size (0 = byte, 1 = short, 2 = long) */
293 FALSE
, /* pc_relative */
295 complain_overflow_dont
, /* complain_on_overflow */
296 bfd_elf_generic_reloc
, /* special_function */
297 "R_AVR_HH8_LDI_NEG", /* name */
298 FALSE
, /* partial_inplace */
299 0xffff, /* src_mask */
300 0xffff, /* dst_mask */
301 FALSE
), /* pcrel_offset */
302 /* A low 8 bit absolute relocation of 24 bit program memory address.
303 For LDI command. Will not be changed when linker stubs are needed. */
304 HOWTO (R_AVR_LO8_LDI_PM
, /* type */
306 1, /* size (0 = byte, 1 = short, 2 = long) */
308 FALSE
, /* pc_relative */
310 complain_overflow_dont
, /* complain_on_overflow */
311 bfd_elf_generic_reloc
, /* special_function */
312 "R_AVR_LO8_LDI_PM", /* name */
313 FALSE
, /* partial_inplace */
314 0xffff, /* src_mask */
315 0xffff, /* dst_mask */
316 FALSE
), /* pcrel_offset */
317 /* A low 8 bit absolute relocation of 24 bit program memory address.
318 For LDI command. Will not be changed when linker stubs are needed. */
319 HOWTO (R_AVR_HI8_LDI_PM
, /* type */
321 1, /* size (0 = byte, 1 = short, 2 = long) */
323 FALSE
, /* pc_relative */
325 complain_overflow_dont
, /* complain_on_overflow */
326 bfd_elf_generic_reloc
, /* special_function */
327 "R_AVR_HI8_LDI_PM", /* name */
328 FALSE
, /* partial_inplace */
329 0xffff, /* src_mask */
330 0xffff, /* dst_mask */
331 FALSE
), /* pcrel_offset */
332 /* A low 8 bit absolute relocation of 24 bit program memory address.
333 For LDI command. Will not be changed when linker stubs are needed. */
334 HOWTO (R_AVR_HH8_LDI_PM
, /* type */
336 1, /* size (0 = byte, 1 = short, 2 = long) */
338 FALSE
, /* pc_relative */
340 complain_overflow_dont
, /* complain_on_overflow */
341 bfd_elf_generic_reloc
, /* special_function */
342 "R_AVR_HH8_LDI_PM", /* name */
343 FALSE
, /* partial_inplace */
344 0xffff, /* src_mask */
345 0xffff, /* dst_mask */
346 FALSE
), /* pcrel_offset */
347 /* A low 8 bit absolute relocation of 24 bit program memory address.
348 For LDI command. Will not be changed when linker stubs are needed. */
349 HOWTO (R_AVR_LO8_LDI_PM_NEG
, /* type */
351 1, /* size (0 = byte, 1 = short, 2 = long) */
353 FALSE
, /* pc_relative */
355 complain_overflow_dont
, /* complain_on_overflow */
356 bfd_elf_generic_reloc
, /* special_function */
357 "R_AVR_LO8_LDI_PM_NEG", /* name */
358 FALSE
, /* partial_inplace */
359 0xffff, /* src_mask */
360 0xffff, /* dst_mask */
361 FALSE
), /* pcrel_offset */
362 /* A low 8 bit absolute relocation of 24 bit program memory address.
363 For LDI command. Will not be changed when linker stubs are needed. */
364 HOWTO (R_AVR_HI8_LDI_PM_NEG
, /* type */
366 1, /* size (0 = byte, 1 = short, 2 = long) */
368 FALSE
, /* pc_relative */
370 complain_overflow_dont
, /* complain_on_overflow */
371 bfd_elf_generic_reloc
, /* special_function */
372 "R_AVR_HI8_LDI_PM_NEG", /* name */
373 FALSE
, /* partial_inplace */
374 0xffff, /* src_mask */
375 0xffff, /* dst_mask */
376 FALSE
), /* pcrel_offset */
377 /* A low 8 bit absolute relocation of 24 bit program memory address.
378 For LDI command. Will not be changed when linker stubs are needed. */
379 HOWTO (R_AVR_HH8_LDI_PM_NEG
, /* type */
381 1, /* size (0 = byte, 1 = short, 2 = long) */
383 FALSE
, /* pc_relative */
385 complain_overflow_dont
, /* complain_on_overflow */
386 bfd_elf_generic_reloc
, /* special_function */
387 "R_AVR_HH8_LDI_PM_NEG", /* name */
388 FALSE
, /* partial_inplace */
389 0xffff, /* src_mask */
390 0xffff, /* dst_mask */
391 FALSE
), /* pcrel_offset */
392 /* Relocation for CALL command in ATmega. */
393 HOWTO (R_AVR_CALL
, /* type */
395 2, /* size (0 = byte, 1 = short, 2 = long) */
397 FALSE
, /* pc_relative */
399 complain_overflow_dont
,/* complain_on_overflow */
400 bfd_elf_generic_reloc
, /* special_function */
401 "R_AVR_CALL", /* name */
402 FALSE
, /* partial_inplace */
403 0xffffffff, /* src_mask */
404 0xffffffff, /* dst_mask */
405 FALSE
), /* pcrel_offset */
406 /* A 16 bit absolute relocation of 16 bit address.
408 HOWTO (R_AVR_LDI
, /* type */
410 1, /* size (0 = byte, 1 = short, 2 = long) */
412 FALSE
, /* pc_relative */
414 complain_overflow_dont
,/* complain_on_overflow */
415 bfd_elf_generic_reloc
, /* special_function */
416 "R_AVR_LDI", /* name */
417 FALSE
, /* partial_inplace */
418 0xffff, /* src_mask */
419 0xffff, /* dst_mask */
420 FALSE
), /* pcrel_offset */
421 /* A 6 bit absolute relocation of 6 bit offset.
422 For ldd/sdd command. */
423 HOWTO (R_AVR_6
, /* type */
425 0, /* size (0 = byte, 1 = short, 2 = long) */
427 FALSE
, /* pc_relative */
429 complain_overflow_dont
,/* complain_on_overflow */
430 bfd_elf_generic_reloc
, /* special_function */
431 "R_AVR_6", /* name */
432 FALSE
, /* partial_inplace */
433 0xffff, /* src_mask */
434 0xffff, /* dst_mask */
435 FALSE
), /* pcrel_offset */
436 /* A 6 bit absolute relocation of 6 bit offset.
437 For sbiw/adiw command. */
438 HOWTO (R_AVR_6_ADIW
, /* type */
440 0, /* size (0 = byte, 1 = short, 2 = long) */
442 FALSE
, /* pc_relative */
444 complain_overflow_dont
,/* complain_on_overflow */
445 bfd_elf_generic_reloc
, /* special_function */
446 "R_AVR_6_ADIW", /* name */
447 FALSE
, /* partial_inplace */
448 0xffff, /* src_mask */
449 0xffff, /* dst_mask */
450 FALSE
), /* pcrel_offset */
451 /* Most significant 8 bit value of a 32 bit link-time constant. */
452 HOWTO (R_AVR_MS8_LDI
, /* type */
454 1, /* size (0 = byte, 1 = short, 2 = long) */
456 FALSE
, /* pc_relative */
458 complain_overflow_dont
, /* complain_on_overflow */
459 bfd_elf_generic_reloc
, /* special_function */
460 "R_AVR_MS8_LDI", /* name */
461 FALSE
, /* partial_inplace */
462 0xffff, /* src_mask */
463 0xffff, /* dst_mask */
464 FALSE
), /* pcrel_offset */
465 /* Negative most significant 8 bit value of a 32 bit link-time constant. */
466 HOWTO (R_AVR_MS8_LDI_NEG
, /* type */
468 1, /* size (0 = byte, 1 = short, 2 = long) */
470 FALSE
, /* pc_relative */
472 complain_overflow_dont
, /* complain_on_overflow */
473 bfd_elf_generic_reloc
, /* special_function */
474 "R_AVR_MS8_LDI_NEG", /* name */
475 FALSE
, /* partial_inplace */
476 0xffff, /* src_mask */
477 0xffff, /* dst_mask */
478 FALSE
), /* pcrel_offset */
479 /* A low 8 bit absolute relocation of 24 bit program memory address.
480 For LDI command. Will be changed when linker stubs are needed. */
481 HOWTO (R_AVR_LO8_LDI_GS
, /* type */
483 1, /* size (0 = byte, 1 = short, 2 = long) */
485 FALSE
, /* pc_relative */
487 complain_overflow_dont
, /* complain_on_overflow */
488 bfd_elf_generic_reloc
, /* special_function */
489 "R_AVR_LO8_LDI_GS", /* name */
490 FALSE
, /* partial_inplace */
491 0xffff, /* src_mask */
492 0xffff, /* dst_mask */
493 FALSE
), /* pcrel_offset */
494 /* A low 8 bit absolute relocation of 24 bit program memory address.
495 For LDI command. Will be changed when linker stubs are needed. */
496 HOWTO (R_AVR_HI8_LDI_GS
, /* type */
498 1, /* size (0 = byte, 1 = short, 2 = long) */
500 FALSE
, /* pc_relative */
502 complain_overflow_dont
, /* complain_on_overflow */
503 bfd_elf_generic_reloc
, /* special_function */
504 "R_AVR_HI8_LDI_GS", /* name */
505 FALSE
, /* partial_inplace */
506 0xffff, /* src_mask */
507 0xffff, /* dst_mask */
508 FALSE
), /* pcrel_offset */
510 HOWTO (R_AVR_8
, /* type */
512 0, /* size (0 = byte, 1 = short, 2 = long) */
514 FALSE
, /* pc_relative */
516 complain_overflow_bitfield
,/* complain_on_overflow */
517 bfd_elf_generic_reloc
, /* special_function */
518 "R_AVR_8", /* name */
519 FALSE
, /* partial_inplace */
520 0x000000ff, /* src_mask */
521 0x000000ff, /* dst_mask */
522 FALSE
), /* pcrel_offset */
523 /* lo8-part to use in .byte lo8(sym). */
524 HOWTO (R_AVR_8_LO8
, /* type */
526 0, /* size (0 = byte, 1 = short, 2 = long) */
528 FALSE
, /* pc_relative */
530 complain_overflow_dont
,/* complain_on_overflow */
531 bfd_elf_generic_reloc
, /* special_function */
532 "R_AVR_8_LO8", /* name */
533 FALSE
, /* partial_inplace */
534 0xffffff, /* src_mask */
535 0xffffff, /* dst_mask */
536 FALSE
), /* pcrel_offset */
537 /* hi8-part to use in .byte hi8(sym). */
538 HOWTO (R_AVR_8_HI8
, /* type */
540 0, /* size (0 = byte, 1 = short, 2 = long) */
542 FALSE
, /* pc_relative */
544 complain_overflow_dont
,/* complain_on_overflow */
545 bfd_elf_generic_reloc
, /* special_function */
546 "R_AVR_8_HI8", /* name */
547 FALSE
, /* partial_inplace */
548 0xffffff, /* src_mask */
549 0xffffff, /* dst_mask */
550 FALSE
), /* pcrel_offset */
551 /* hlo8-part to use in .byte hlo8(sym). */
552 HOWTO (R_AVR_8_HLO8
, /* type */
554 0, /* size (0 = byte, 1 = short, 2 = long) */
556 FALSE
, /* pc_relative */
558 complain_overflow_dont
,/* complain_on_overflow */
559 bfd_elf_generic_reloc
, /* special_function */
560 "R_AVR_8_HLO8", /* name */
561 FALSE
, /* partial_inplace */
562 0xffffff, /* src_mask */
563 0xffffff, /* dst_mask */
564 FALSE
), /* pcrel_offset */
565 HOWTO (R_AVR_DIFF8
, /* type */
567 0, /* size (0 = byte, 1 = short, 2 = long) */
569 FALSE
, /* pc_relative */
571 complain_overflow_bitfield
, /* complain_on_overflow */
572 bfd_elf_avr_diff_reloc
, /* special_function */
573 "R_AVR_DIFF8", /* name */
574 FALSE
, /* partial_inplace */
577 FALSE
), /* pcrel_offset */
578 HOWTO (R_AVR_DIFF16
, /* type */
580 1, /* size (0 = byte, 1 = short, 2 = long) */
582 FALSE
, /* pc_relative */
584 complain_overflow_bitfield
, /* complain_on_overflow */
585 bfd_elf_avr_diff_reloc
,/* special_function */
586 "R_AVR_DIFF16", /* name */
587 FALSE
, /* partial_inplace */
589 0xffff, /* dst_mask */
590 FALSE
), /* pcrel_offset */
591 HOWTO (R_AVR_DIFF32
, /* type */
593 2, /* size (0 = byte, 1 = short, 2 = long) */
595 FALSE
, /* pc_relative */
597 complain_overflow_bitfield
, /* complain_on_overflow */
598 bfd_elf_avr_diff_reloc
,/* special_function */
599 "R_AVR_DIFF32", /* name */
600 FALSE
, /* partial_inplace */
602 0xffffffff, /* dst_mask */
603 FALSE
), /* pcrel_offset */
604 /* 7 bit immediate for LDS/STS in Tiny core. */
605 HOWTO (R_AVR_LDS_STS_16
, /* type */
607 1, /* size (0 = byte, 1 = short, 2 = long) */
609 FALSE
, /* pc_relative */
611 complain_overflow_dont
,/* complain_on_overflow */
612 bfd_elf_generic_reloc
, /* special_function */
613 "R_AVR_LDS_STS_16", /* name */
614 FALSE
, /* partial_inplace */
615 0xffff, /* src_mask */
616 0xffff, /* dst_mask */
617 FALSE
), /* pcrel_offset */
619 HOWTO (R_AVR_PORT6
, /* type */
621 0, /* size (0 = byte, 1 = short, 2 = long) */
623 FALSE
, /* pc_relative */
625 complain_overflow_dont
,/* complain_on_overflow */
626 bfd_elf_generic_reloc
, /* special_function */
627 "R_AVR_PORT6", /* name */
628 FALSE
, /* partial_inplace */
629 0xffffff, /* src_mask */
630 0xffffff, /* dst_mask */
631 FALSE
), /* pcrel_offset */
632 HOWTO (R_AVR_PORT5
, /* type */
634 0, /* size (0 = byte, 1 = short, 2 = long) */
636 FALSE
, /* pc_relative */
638 complain_overflow_dont
,/* complain_on_overflow */
639 bfd_elf_generic_reloc
, /* special_function */
640 "R_AVR_PORT5", /* name */
641 FALSE
, /* partial_inplace */
642 0xffffff, /* src_mask */
643 0xffffff, /* dst_mask */
644 FALSE
), /* pcrel_offset */
646 /* A 32 bit PC relative relocation. */
647 HOWTO (R_AVR_32_PCREL
, /* type */
649 2, /* size (0 = byte, 1 = short, 2 = long) */
651 TRUE
, /* pc_relative */
653 complain_overflow_bitfield
, /* complain_on_overflow */
654 bfd_elf_generic_reloc
, /* special_function */
655 "R_AVR_32_PCREL", /* name */
656 FALSE
, /* partial_inplace */
657 0xffffffff, /* src_mask */
658 0xffffffff, /* dst_mask */
659 TRUE
), /* pcrel_offset */
662 /* Map BFD reloc types to AVR ELF reloc types. */
666 bfd_reloc_code_real_type bfd_reloc_val
;
667 unsigned int elf_reloc_val
;
670 static const struct avr_reloc_map avr_reloc_map
[] =
672 { BFD_RELOC_NONE
, R_AVR_NONE
},
673 { BFD_RELOC_32
, R_AVR_32
},
674 { BFD_RELOC_AVR_7_PCREL
, R_AVR_7_PCREL
},
675 { BFD_RELOC_AVR_13_PCREL
, R_AVR_13_PCREL
},
676 { BFD_RELOC_16
, R_AVR_16
},
677 { BFD_RELOC_AVR_16_PM
, R_AVR_16_PM
},
678 { BFD_RELOC_AVR_LO8_LDI
, R_AVR_LO8_LDI
},
679 { BFD_RELOC_AVR_HI8_LDI
, R_AVR_HI8_LDI
},
680 { BFD_RELOC_AVR_HH8_LDI
, R_AVR_HH8_LDI
},
681 { BFD_RELOC_AVR_MS8_LDI
, R_AVR_MS8_LDI
},
682 { BFD_RELOC_AVR_LO8_LDI_NEG
, R_AVR_LO8_LDI_NEG
},
683 { BFD_RELOC_AVR_HI8_LDI_NEG
, R_AVR_HI8_LDI_NEG
},
684 { BFD_RELOC_AVR_HH8_LDI_NEG
, R_AVR_HH8_LDI_NEG
},
685 { BFD_RELOC_AVR_MS8_LDI_NEG
, R_AVR_MS8_LDI_NEG
},
686 { BFD_RELOC_AVR_LO8_LDI_PM
, R_AVR_LO8_LDI_PM
},
687 { BFD_RELOC_AVR_LO8_LDI_GS
, R_AVR_LO8_LDI_GS
},
688 { BFD_RELOC_AVR_HI8_LDI_PM
, R_AVR_HI8_LDI_PM
},
689 { BFD_RELOC_AVR_HI8_LDI_GS
, R_AVR_HI8_LDI_GS
},
690 { BFD_RELOC_AVR_HH8_LDI_PM
, R_AVR_HH8_LDI_PM
},
691 { BFD_RELOC_AVR_LO8_LDI_PM_NEG
, R_AVR_LO8_LDI_PM_NEG
},
692 { BFD_RELOC_AVR_HI8_LDI_PM_NEG
, R_AVR_HI8_LDI_PM_NEG
},
693 { BFD_RELOC_AVR_HH8_LDI_PM_NEG
, R_AVR_HH8_LDI_PM_NEG
},
694 { BFD_RELOC_AVR_CALL
, R_AVR_CALL
},
695 { BFD_RELOC_AVR_LDI
, R_AVR_LDI
},
696 { BFD_RELOC_AVR_6
, R_AVR_6
},
697 { BFD_RELOC_AVR_6_ADIW
, R_AVR_6_ADIW
},
698 { BFD_RELOC_8
, R_AVR_8
},
699 { BFD_RELOC_AVR_8_LO
, R_AVR_8_LO8
},
700 { BFD_RELOC_AVR_8_HI
, R_AVR_8_HI8
},
701 { BFD_RELOC_AVR_8_HLO
, R_AVR_8_HLO8
},
702 { BFD_RELOC_AVR_DIFF8
, R_AVR_DIFF8
},
703 { BFD_RELOC_AVR_DIFF16
, R_AVR_DIFF16
},
704 { BFD_RELOC_AVR_DIFF32
, R_AVR_DIFF32
},
705 { BFD_RELOC_AVR_LDS_STS_16
, R_AVR_LDS_STS_16
},
706 { BFD_RELOC_AVR_PORT6
, R_AVR_PORT6
},
707 { BFD_RELOC_AVR_PORT5
, R_AVR_PORT5
},
708 { BFD_RELOC_32_PCREL
, R_AVR_32_PCREL
}
711 /* Meant to be filled one day with the wrap around address for the
712 specific device. I.e. should get the value 0x4000 for 16k devices,
713 0x8000 for 32k devices and so on.
715 We initialize it here with a value of 0x1000000 resulting in
716 that we will never suggest a wrap-around jump during relaxation.
717 The logic of the source code later on assumes that in
718 avr_pc_wrap_around one single bit is set. */
719 static bfd_vma avr_pc_wrap_around
= 0x10000000;
721 /* If this variable holds a value different from zero, the linker relaxation
722 machine will try to optimize call/ret sequences by a single jump
723 instruction. This option could be switched off by a linker switch. */
724 static int avr_replace_call_ret_sequences
= 1;
727 /* Per-section relaxation related information for avr. */
729 struct avr_relax_info
731 /* Track the avr property records that apply to this section. */
735 /* Number of records in the list. */
738 /* How many records worth of space have we allocated. */
741 /* The records, only COUNT records are initialised. */
742 struct avr_property_record
*items
;
746 /* Per section data, specialised for avr. */
748 struct elf_avr_section_data
750 /* The standard data must appear first. */
751 struct bfd_elf_section_data elf
;
753 /* Relaxation related information. */
754 struct avr_relax_info relax_info
;
757 /* Possibly initialise avr specific data for new section SEC from ABFD. */
760 elf_avr_new_section_hook (bfd
*abfd
, asection
*sec
)
762 if (!sec
->used_by_bfd
)
764 struct elf_avr_section_data
*sdata
;
765 bfd_size_type amt
= sizeof (*sdata
);
767 sdata
= bfd_zalloc (abfd
, amt
);
770 sec
->used_by_bfd
= sdata
;
773 return _bfd_elf_new_section_hook (abfd
, sec
);
776 /* Return a pointer to the relaxation information for SEC. */
778 static struct avr_relax_info
*
779 get_avr_relax_info (asection
*sec
)
781 struct elf_avr_section_data
*section_data
;
783 /* No info available if no section or if it is an output section. */
784 if (!sec
|| sec
== sec
->output_section
)
787 section_data
= (struct elf_avr_section_data
*) elf_section_data (sec
);
788 return §ion_data
->relax_info
;
791 /* Initialise the per section relaxation information for SEC. */
794 init_avr_relax_info (asection
*sec
)
796 struct avr_relax_info
*relax_info
= get_avr_relax_info (sec
);
798 relax_info
->records
.count
= 0;
799 relax_info
->records
.allocated
= 0;
800 relax_info
->records
.items
= NULL
;
803 /* Initialize an entry in the stub hash table. */
805 static struct bfd_hash_entry
*
806 stub_hash_newfunc (struct bfd_hash_entry
*entry
,
807 struct bfd_hash_table
*table
,
810 /* Allocate the structure if it has not already been allocated by a
814 entry
= bfd_hash_allocate (table
,
815 sizeof (struct elf32_avr_stub_hash_entry
));
820 /* Call the allocation method of the superclass. */
821 entry
= bfd_hash_newfunc (entry
, table
, string
);
824 struct elf32_avr_stub_hash_entry
*hsh
;
826 /* Initialize the local fields. */
827 hsh
= avr_stub_hash_entry (entry
);
828 hsh
->stub_offset
= 0;
829 hsh
->target_value
= 0;
835 /* This function is just a straight passthrough to the real
836 function in linker.c. Its prupose is so that its address
837 can be compared inside the avr_link_hash_table macro. */
839 static struct bfd_hash_entry
*
840 elf32_avr_link_hash_newfunc (struct bfd_hash_entry
* entry
,
841 struct bfd_hash_table
* table
,
844 return _bfd_elf_link_hash_newfunc (entry
, table
, string
);
847 /* Free the derived linker hash table. */
850 elf32_avr_link_hash_table_free (bfd
*obfd
)
852 struct elf32_avr_link_hash_table
*htab
853 = (struct elf32_avr_link_hash_table
*) obfd
->link
.hash
;
855 /* Free the address mapping table. */
856 if (htab
->amt_stub_offsets
!= NULL
)
857 free (htab
->amt_stub_offsets
);
858 if (htab
->amt_destination_addr
!= NULL
)
859 free (htab
->amt_destination_addr
);
861 bfd_hash_table_free (&htab
->bstab
);
862 _bfd_elf_link_hash_table_free (obfd
);
865 /* Create the derived linker hash table. The AVR ELF port uses the derived
866 hash table to keep information specific to the AVR ELF linker (without
867 using static variables). */
869 static struct bfd_link_hash_table
*
870 elf32_avr_link_hash_table_create (bfd
*abfd
)
872 struct elf32_avr_link_hash_table
*htab
;
873 bfd_size_type amt
= sizeof (*htab
);
875 htab
= bfd_zmalloc (amt
);
879 if (!_bfd_elf_link_hash_table_init (&htab
->etab
, abfd
,
880 elf32_avr_link_hash_newfunc
,
881 sizeof (struct elf_link_hash_entry
),
888 /* Init the stub hash table too. */
889 if (!bfd_hash_table_init (&htab
->bstab
, stub_hash_newfunc
,
890 sizeof (struct elf32_avr_stub_hash_entry
)))
892 _bfd_elf_link_hash_table_free (abfd
);
895 htab
->etab
.root
.hash_table_free
= elf32_avr_link_hash_table_free
;
897 return &htab
->etab
.root
;
900 /* Calculates the effective distance of a pc relative jump/call. */
903 avr_relative_distance_considering_wrap_around (unsigned int distance
)
905 unsigned int wrap_around_mask
= avr_pc_wrap_around
- 1;
906 int dist_with_wrap_around
= distance
& wrap_around_mask
;
908 if (dist_with_wrap_around
> ((int) (avr_pc_wrap_around
>> 1)))
909 dist_with_wrap_around
-= avr_pc_wrap_around
;
911 return dist_with_wrap_around
;
915 static reloc_howto_type
*
916 bfd_elf32_bfd_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
917 bfd_reloc_code_real_type code
)
922 i
< sizeof (avr_reloc_map
) / sizeof (struct avr_reloc_map
);
924 if (avr_reloc_map
[i
].bfd_reloc_val
== code
)
925 return &elf_avr_howto_table
[avr_reloc_map
[i
].elf_reloc_val
];
930 static reloc_howto_type
*
931 bfd_elf32_bfd_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
937 i
< sizeof (elf_avr_howto_table
) / sizeof (elf_avr_howto_table
[0]);
939 if (elf_avr_howto_table
[i
].name
!= NULL
940 && strcasecmp (elf_avr_howto_table
[i
].name
, r_name
) == 0)
941 return &elf_avr_howto_table
[i
];
946 /* Set the howto pointer for an AVR ELF reloc. */
949 avr_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
951 Elf_Internal_Rela
*dst
)
955 r_type
= ELF32_R_TYPE (dst
->r_info
);
956 if (r_type
>= (unsigned int) R_AVR_max
)
958 /* xgettext:c-format */
959 _bfd_error_handler (_("%B: invalid AVR reloc number: %d"), abfd
, r_type
);
962 cache_ptr
->howto
= &elf_avr_howto_table
[r_type
];
966 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation
)
968 return (relocation
>= 0x020000);
971 /* Returns the address of the corresponding stub if there is one.
972 Returns otherwise an address above 0x020000. This function
973 could also be used, if there is no knowledge on the section where
974 the destination is found. */
977 avr_get_stub_addr (bfd_vma srel
,
978 struct elf32_avr_link_hash_table
*htab
)
981 bfd_vma stub_sec_addr
=
982 (htab
->stub_sec
->output_section
->vma
+
983 htab
->stub_sec
->output_offset
);
985 for (sindex
= 0; sindex
< htab
->amt_max_entry_cnt
; sindex
++)
986 if (htab
->amt_destination_addr
[sindex
] == srel
)
987 return htab
->amt_stub_offsets
[sindex
] + stub_sec_addr
;
989 /* Return an address that could not be reached by 16 bit relocs. */
993 /* Perform a diff relocation. Nothing to do, as the difference value is already
994 written into the section's contents. */
996 static bfd_reloc_status_type
997 bfd_elf_avr_diff_reloc (bfd
*abfd ATTRIBUTE_UNUSED
,
998 arelent
*reloc_entry ATTRIBUTE_UNUSED
,
999 asymbol
*symbol ATTRIBUTE_UNUSED
,
1000 void *data ATTRIBUTE_UNUSED
,
1001 asection
*input_section ATTRIBUTE_UNUSED
,
1002 bfd
*output_bfd ATTRIBUTE_UNUSED
,
1003 char **error_message ATTRIBUTE_UNUSED
)
1005 return bfd_reloc_ok
;
1009 /* Perform a single relocation. By default we use the standard BFD
1010 routines, but a few relocs, we have to do them ourselves. */
1012 static bfd_reloc_status_type
1013 avr_final_link_relocate (reloc_howto_type
* howto
,
1015 asection
* input_section
,
1016 bfd_byte
* contents
,
1017 Elf_Internal_Rela
* rel
,
1019 struct elf32_avr_link_hash_table
* htab
)
1021 bfd_reloc_status_type r
= bfd_reloc_ok
;
1023 bfd_signed_vma srel
;
1024 bfd_signed_vma reloc_addr
;
1025 bfd_boolean use_stubs
= FALSE
;
1026 /* Usually is 0, unless we are generating code for a bootloader. */
1027 bfd_signed_vma base_addr
= htab
->vector_base
;
1029 /* Absolute addr of the reloc in the final excecutable. */
1030 reloc_addr
= rel
->r_offset
+ input_section
->output_section
->vma
1031 + input_section
->output_offset
;
1033 switch (howto
->type
)
1036 contents
+= rel
->r_offset
;
1037 srel
= (bfd_signed_vma
) relocation
;
1038 srel
+= rel
->r_addend
;
1039 srel
-= rel
->r_offset
;
1040 srel
-= 2; /* Branch instructions add 2 to the PC... */
1041 srel
-= (input_section
->output_section
->vma
+
1042 input_section
->output_offset
);
1045 return bfd_reloc_outofrange
;
1046 if (srel
> ((1 << 7) - 1) || (srel
< - (1 << 7)))
1047 return bfd_reloc_overflow
;
1048 x
= bfd_get_16 (input_bfd
, contents
);
1049 x
= (x
& 0xfc07) | (((srel
>> 1) << 3) & 0x3f8);
1050 bfd_put_16 (input_bfd
, x
, contents
);
1053 case R_AVR_13_PCREL
:
1054 contents
+= rel
->r_offset
;
1055 srel
= (bfd_signed_vma
) relocation
;
1056 srel
+= rel
->r_addend
;
1057 srel
-= rel
->r_offset
;
1058 srel
-= 2; /* Branch instructions add 2 to the PC... */
1059 srel
-= (input_section
->output_section
->vma
+
1060 input_section
->output_offset
);
1063 return bfd_reloc_outofrange
;
1065 srel
= avr_relative_distance_considering_wrap_around (srel
);
1067 /* AVR addresses commands as words. */
1070 /* Check for overflow. */
1071 if (srel
< -2048 || srel
> 2047)
1073 /* Relative distance is too large. */
1075 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1076 switch (bfd_get_mach (input_bfd
))
1079 case bfd_mach_avr25
:
1084 return bfd_reloc_overflow
;
1088 x
= bfd_get_16 (input_bfd
, contents
);
1089 x
= (x
& 0xf000) | (srel
& 0xfff);
1090 bfd_put_16 (input_bfd
, x
, contents
);
1094 contents
+= rel
->r_offset
;
1095 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1096 x
= bfd_get_16 (input_bfd
, contents
);
1097 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1098 bfd_put_16 (input_bfd
, x
, contents
);
1102 contents
+= rel
->r_offset
;
1103 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1104 if (((srel
> 0) && (srel
& 0xffff) > 255)
1105 || ((srel
< 0) && ((-srel
) & 0xffff) > 128))
1106 /* Remove offset for data/eeprom section. */
1107 return bfd_reloc_overflow
;
1109 x
= bfd_get_16 (input_bfd
, contents
);
1110 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1111 bfd_put_16 (input_bfd
, x
, contents
);
1115 contents
+= rel
->r_offset
;
1116 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1117 if (((srel
& 0xffff) > 63) || (srel
< 0))
1118 /* Remove offset for data/eeprom section. */
1119 return bfd_reloc_overflow
;
1120 x
= bfd_get_16 (input_bfd
, contents
);
1121 x
= (x
& 0xd3f8) | ((srel
& 7) | ((srel
& (3 << 3)) << 7)
1122 | ((srel
& (1 << 5)) << 8));
1123 bfd_put_16 (input_bfd
, x
, contents
);
1127 contents
+= rel
->r_offset
;
1128 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1129 if (((srel
& 0xffff) > 63) || (srel
< 0))
1130 /* Remove offset for data/eeprom section. */
1131 return bfd_reloc_overflow
;
1132 x
= bfd_get_16 (input_bfd
, contents
);
1133 x
= (x
& 0xff30) | (srel
& 0xf) | ((srel
& 0x30) << 2);
1134 bfd_put_16 (input_bfd
, x
, contents
);
1138 contents
+= rel
->r_offset
;
1139 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1140 srel
= (srel
>> 8) & 0xff;
1141 x
= bfd_get_16 (input_bfd
, contents
);
1142 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1143 bfd_put_16 (input_bfd
, x
, contents
);
1147 contents
+= rel
->r_offset
;
1148 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1149 srel
= (srel
>> 16) & 0xff;
1150 x
= bfd_get_16 (input_bfd
, contents
);
1151 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1152 bfd_put_16 (input_bfd
, x
, contents
);
1156 contents
+= rel
->r_offset
;
1157 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1158 srel
= (srel
>> 24) & 0xff;
1159 x
= bfd_get_16 (input_bfd
, contents
);
1160 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1161 bfd_put_16 (input_bfd
, x
, contents
);
1164 case R_AVR_LO8_LDI_NEG
:
1165 contents
+= rel
->r_offset
;
1166 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1168 x
= bfd_get_16 (input_bfd
, contents
);
1169 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1170 bfd_put_16 (input_bfd
, x
, contents
);
1173 case R_AVR_HI8_LDI_NEG
:
1174 contents
+= rel
->r_offset
;
1175 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1177 srel
= (srel
>> 8) & 0xff;
1178 x
= bfd_get_16 (input_bfd
, contents
);
1179 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1180 bfd_put_16 (input_bfd
, x
, contents
);
1183 case R_AVR_HH8_LDI_NEG
:
1184 contents
+= rel
->r_offset
;
1185 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1187 srel
= (srel
>> 16) & 0xff;
1188 x
= bfd_get_16 (input_bfd
, contents
);
1189 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1190 bfd_put_16 (input_bfd
, x
, contents
);
1193 case R_AVR_MS8_LDI_NEG
:
1194 contents
+= rel
->r_offset
;
1195 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1197 srel
= (srel
>> 24) & 0xff;
1198 x
= bfd_get_16 (input_bfd
, contents
);
1199 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1200 bfd_put_16 (input_bfd
, x
, contents
);
1203 case R_AVR_LO8_LDI_GS
:
1204 use_stubs
= (!htab
->no_stubs
);
1206 case R_AVR_LO8_LDI_PM
:
1207 contents
+= rel
->r_offset
;
1208 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1211 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1213 bfd_vma old_srel
= srel
;
1215 /* We need to use the address of the stub instead. */
1216 srel
= avr_get_stub_addr (srel
, htab
);
1218 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1219 "reloc at address 0x%x.\n",
1220 (unsigned int) srel
,
1221 (unsigned int) old_srel
,
1222 (unsigned int) reloc_addr
);
1224 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1225 return bfd_reloc_outofrange
;
1229 return bfd_reloc_outofrange
;
1231 x
= bfd_get_16 (input_bfd
, contents
);
1232 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1233 bfd_put_16 (input_bfd
, x
, contents
);
1236 case R_AVR_HI8_LDI_GS
:
1237 use_stubs
= (!htab
->no_stubs
);
1239 case R_AVR_HI8_LDI_PM
:
1240 contents
+= rel
->r_offset
;
1241 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1244 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1246 bfd_vma old_srel
= srel
;
1248 /* We need to use the address of the stub instead. */
1249 srel
= avr_get_stub_addr (srel
, htab
);
1251 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1252 "reloc at address 0x%x.\n",
1253 (unsigned int) srel
,
1254 (unsigned int) old_srel
,
1255 (unsigned int) reloc_addr
);
1257 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1258 return bfd_reloc_outofrange
;
1262 return bfd_reloc_outofrange
;
1264 srel
= (srel
>> 8) & 0xff;
1265 x
= bfd_get_16 (input_bfd
, contents
);
1266 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1267 bfd_put_16 (input_bfd
, x
, contents
);
1270 case R_AVR_HH8_LDI_PM
:
1271 contents
+= rel
->r_offset
;
1272 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1274 return bfd_reloc_outofrange
;
1276 srel
= (srel
>> 16) & 0xff;
1277 x
= bfd_get_16 (input_bfd
, contents
);
1278 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1279 bfd_put_16 (input_bfd
, x
, contents
);
1282 case R_AVR_LO8_LDI_PM_NEG
:
1283 contents
+= rel
->r_offset
;
1284 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1287 return bfd_reloc_outofrange
;
1289 x
= bfd_get_16 (input_bfd
, contents
);
1290 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1291 bfd_put_16 (input_bfd
, x
, contents
);
1294 case R_AVR_HI8_LDI_PM_NEG
:
1295 contents
+= rel
->r_offset
;
1296 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1299 return bfd_reloc_outofrange
;
1301 srel
= (srel
>> 8) & 0xff;
1302 x
= bfd_get_16 (input_bfd
, contents
);
1303 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1304 bfd_put_16 (input_bfd
, x
, contents
);
1307 case R_AVR_HH8_LDI_PM_NEG
:
1308 contents
+= rel
->r_offset
;
1309 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1312 return bfd_reloc_outofrange
;
1314 srel
= (srel
>> 16) & 0xff;
1315 x
= bfd_get_16 (input_bfd
, contents
);
1316 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1317 bfd_put_16 (input_bfd
, x
, contents
);
1321 contents
+= rel
->r_offset
;
1322 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1324 return bfd_reloc_outofrange
;
1326 x
= bfd_get_16 (input_bfd
, contents
);
1327 x
|= ((srel
& 0x10000) | ((srel
<< 3) & 0x1f00000)) >> 16;
1328 bfd_put_16 (input_bfd
, x
, contents
);
1329 bfd_put_16 (input_bfd
, (bfd_vma
) srel
& 0xffff, contents
+2);
1333 use_stubs
= (!htab
->no_stubs
);
1334 contents
+= rel
->r_offset
;
1335 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1338 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1340 bfd_vma old_srel
= srel
;
1342 /* We need to use the address of the stub instead. */
1343 srel
= avr_get_stub_addr (srel
,htab
);
1345 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1346 "reloc at address 0x%x.\n",
1347 (unsigned int) srel
,
1348 (unsigned int) old_srel
,
1349 (unsigned int) reloc_addr
);
1351 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1352 return bfd_reloc_outofrange
;
1356 return bfd_reloc_outofrange
;
1358 bfd_put_16 (input_bfd
, (bfd_vma
) srel
&0x00ffff, contents
);
1364 /* Nothing to do here, as contents already contains the diff value. */
1368 case R_AVR_LDS_STS_16
:
1369 contents
+= rel
->r_offset
;
1370 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1371 if ((srel
& 0xFFFF) < 0x40 || (srel
& 0xFFFF) > 0xbf)
1372 return bfd_reloc_outofrange
;
1374 x
= bfd_get_16 (input_bfd
, contents
);
1375 x
|= (srel
& 0x0f) | ((srel
& 0x30) << 5) | ((srel
& 0x40) << 2);
1376 bfd_put_16 (input_bfd
, x
, contents
);
1380 contents
+= rel
->r_offset
;
1381 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1382 if ((srel
& 0xffff) > 0x3f)
1383 return bfd_reloc_outofrange
;
1384 x
= bfd_get_16 (input_bfd
, contents
);
1385 x
= (x
& 0xf9f0) | ((srel
& 0x30) << 5) | (srel
& 0x0f);
1386 bfd_put_16 (input_bfd
, x
, contents
);
1390 contents
+= rel
->r_offset
;
1391 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1392 if ((srel
& 0xffff) > 0x1f)
1393 return bfd_reloc_outofrange
;
1394 x
= bfd_get_16 (input_bfd
, contents
);
1395 x
= (x
& 0xff07) | ((srel
& 0x1f) << 3);
1396 bfd_put_16 (input_bfd
, x
, contents
);
1400 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1401 contents
, rel
->r_offset
,
1402 relocation
, rel
->r_addend
);
1408 /* Relocate an AVR ELF section. */
1411 elf32_avr_relocate_section (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1412 struct bfd_link_info
*info
,
1414 asection
*input_section
,
1416 Elf_Internal_Rela
*relocs
,
1417 Elf_Internal_Sym
*local_syms
,
1418 asection
**local_sections
)
1420 Elf_Internal_Shdr
* symtab_hdr
;
1421 struct elf_link_hash_entry
** sym_hashes
;
1422 Elf_Internal_Rela
* rel
;
1423 Elf_Internal_Rela
* relend
;
1424 struct elf32_avr_link_hash_table
* htab
= avr_link_hash_table (info
);
1429 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1430 sym_hashes
= elf_sym_hashes (input_bfd
);
1431 relend
= relocs
+ input_section
->reloc_count
;
1433 for (rel
= relocs
; rel
< relend
; rel
++)
1435 reloc_howto_type
* howto
;
1436 unsigned long r_symndx
;
1437 Elf_Internal_Sym
* sym
;
1439 struct elf_link_hash_entry
* h
;
1441 bfd_reloc_status_type r
;
1445 r_type
= ELF32_R_TYPE (rel
->r_info
);
1446 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1447 howto
= elf_avr_howto_table
+ r_type
;
1452 if (r_symndx
< symtab_hdr
->sh_info
)
1454 sym
= local_syms
+ r_symndx
;
1455 sec
= local_sections
[r_symndx
];
1456 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
1458 name
= bfd_elf_string_from_elf_section
1459 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
1460 name
= (name
== NULL
) ? bfd_section_name (input_bfd
, sec
) : name
;
1464 bfd_boolean unresolved_reloc
, warned
, ignored
;
1466 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
1467 r_symndx
, symtab_hdr
, sym_hashes
,
1469 unresolved_reloc
, warned
, ignored
);
1471 name
= h
->root
.root
.string
;
1474 if (sec
!= NULL
&& discarded_section (sec
))
1475 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
1476 rel
, 1, relend
, howto
, 0, contents
);
1478 if (bfd_link_relocatable (info
))
1481 r
= avr_final_link_relocate (howto
, input_bfd
, input_section
,
1482 contents
, rel
, relocation
, htab
);
1484 if (r
!= bfd_reloc_ok
)
1486 const char * msg
= (const char *) NULL
;
1490 case bfd_reloc_overflow
:
1491 (*info
->callbacks
->reloc_overflow
)
1492 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
1493 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
1496 case bfd_reloc_undefined
:
1497 (*info
->callbacks
->undefined_symbol
)
1498 (info
, name
, input_bfd
, input_section
, rel
->r_offset
, TRUE
);
1501 case bfd_reloc_outofrange
:
1502 msg
= _("internal error: out of range error");
1505 case bfd_reloc_notsupported
:
1506 msg
= _("internal error: unsupported relocation error");
1509 case bfd_reloc_dangerous
:
1510 msg
= _("internal error: dangerous relocation");
1514 msg
= _("internal error: unknown error");
1519 (*info
->callbacks
->warning
) (info
, msg
, name
, input_bfd
,
1520 input_section
, rel
->r_offset
);
1527 /* The final processing done just before writing out a AVR ELF object
1528 file. This gets the AVR architecture right based on the machine
1532 bfd_elf_avr_final_write_processing (bfd
*abfd
,
1533 bfd_boolean linker ATTRIBUTE_UNUSED
)
1537 switch (bfd_get_mach (abfd
))
1541 val
= E_AVR_MACH_AVR2
;
1545 val
= E_AVR_MACH_AVR1
;
1548 case bfd_mach_avr25
:
1549 val
= E_AVR_MACH_AVR25
;
1553 val
= E_AVR_MACH_AVR3
;
1556 case bfd_mach_avr31
:
1557 val
= E_AVR_MACH_AVR31
;
1560 case bfd_mach_avr35
:
1561 val
= E_AVR_MACH_AVR35
;
1565 val
= E_AVR_MACH_AVR4
;
1569 val
= E_AVR_MACH_AVR5
;
1572 case bfd_mach_avr51
:
1573 val
= E_AVR_MACH_AVR51
;
1577 val
= E_AVR_MACH_AVR6
;
1580 case bfd_mach_avrxmega1
:
1581 val
= E_AVR_MACH_XMEGA1
;
1584 case bfd_mach_avrxmega2
:
1585 val
= E_AVR_MACH_XMEGA2
;
1588 case bfd_mach_avrxmega3
:
1589 val
= E_AVR_MACH_XMEGA3
;
1592 case bfd_mach_avrxmega4
:
1593 val
= E_AVR_MACH_XMEGA4
;
1596 case bfd_mach_avrxmega5
:
1597 val
= E_AVR_MACH_XMEGA5
;
1600 case bfd_mach_avrxmega6
:
1601 val
= E_AVR_MACH_XMEGA6
;
1604 case bfd_mach_avrxmega7
:
1605 val
= E_AVR_MACH_XMEGA7
;
1608 case bfd_mach_avrtiny
:
1609 val
= E_AVR_MACH_AVRTINY
;
1613 elf_elfheader (abfd
)->e_machine
= EM_AVR
;
1614 elf_elfheader (abfd
)->e_flags
&= ~ EF_AVR_MACH
;
1615 elf_elfheader (abfd
)->e_flags
|= val
;
1618 /* Set the right machine number. */
1621 elf32_avr_object_p (bfd
*abfd
)
1623 unsigned int e_set
= bfd_mach_avr2
;
1625 if (elf_elfheader (abfd
)->e_machine
== EM_AVR
1626 || elf_elfheader (abfd
)->e_machine
== EM_AVR_OLD
)
1628 int e_mach
= elf_elfheader (abfd
)->e_flags
& EF_AVR_MACH
;
1633 case E_AVR_MACH_AVR2
:
1634 e_set
= bfd_mach_avr2
;
1637 case E_AVR_MACH_AVR1
:
1638 e_set
= bfd_mach_avr1
;
1641 case E_AVR_MACH_AVR25
:
1642 e_set
= bfd_mach_avr25
;
1645 case E_AVR_MACH_AVR3
:
1646 e_set
= bfd_mach_avr3
;
1649 case E_AVR_MACH_AVR31
:
1650 e_set
= bfd_mach_avr31
;
1653 case E_AVR_MACH_AVR35
:
1654 e_set
= bfd_mach_avr35
;
1657 case E_AVR_MACH_AVR4
:
1658 e_set
= bfd_mach_avr4
;
1661 case E_AVR_MACH_AVR5
:
1662 e_set
= bfd_mach_avr5
;
1665 case E_AVR_MACH_AVR51
:
1666 e_set
= bfd_mach_avr51
;
1669 case E_AVR_MACH_AVR6
:
1670 e_set
= bfd_mach_avr6
;
1673 case E_AVR_MACH_XMEGA1
:
1674 e_set
= bfd_mach_avrxmega1
;
1677 case E_AVR_MACH_XMEGA2
:
1678 e_set
= bfd_mach_avrxmega2
;
1681 case E_AVR_MACH_XMEGA3
:
1682 e_set
= bfd_mach_avrxmega3
;
1685 case E_AVR_MACH_XMEGA4
:
1686 e_set
= bfd_mach_avrxmega4
;
1689 case E_AVR_MACH_XMEGA5
:
1690 e_set
= bfd_mach_avrxmega5
;
1693 case E_AVR_MACH_XMEGA6
:
1694 e_set
= bfd_mach_avrxmega6
;
1697 case E_AVR_MACH_XMEGA7
:
1698 e_set
= bfd_mach_avrxmega7
;
1701 case E_AVR_MACH_AVRTINY
:
1702 e_set
= bfd_mach_avrtiny
;
1706 return bfd_default_set_arch_mach (abfd
, bfd_arch_avr
,
1710 /* Returns whether the relocation type passed is a diff reloc. */
1713 elf32_avr_is_diff_reloc (Elf_Internal_Rela
*irel
)
1715 return (ELF32_R_TYPE (irel
->r_info
) == R_AVR_DIFF8
1716 ||ELF32_R_TYPE (irel
->r_info
) == R_AVR_DIFF16
1717 || ELF32_R_TYPE (irel
->r_info
) == R_AVR_DIFF32
);
1720 /* Reduce the diff value written in the section by count if the shrinked
1721 insn address happens to fall between the two symbols for which this
1722 diff reloc was emitted. */
1725 elf32_avr_adjust_diff_reloc_value (bfd
*abfd
,
1726 struct bfd_section
*isec
,
1727 Elf_Internal_Rela
*irel
,
1729 bfd_vma shrinked_insn_address
,
1732 unsigned char *reloc_contents
= NULL
;
1733 unsigned char *isec_contents
= elf_section_data (isec
)->this_hdr
.contents
;
1734 if (isec_contents
== NULL
)
1736 if (! bfd_malloc_and_get_section (abfd
, isec
, &isec_contents
))
1739 elf_section_data (isec
)->this_hdr
.contents
= isec_contents
;
1742 reloc_contents
= isec_contents
+ irel
->r_offset
;
1744 /* Read value written in object file. */
1746 switch (ELF32_R_TYPE (irel
->r_info
))
1750 x
= *reloc_contents
;
1755 x
= bfd_get_16 (abfd
, reloc_contents
);
1760 x
= bfd_get_32 (abfd
, reloc_contents
);
1769 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1770 into the object file at the reloc offset. sym2's logical value is
1771 symval (<start_of_section>) + reloc addend. Compute the start and end
1772 addresses and check if the shrinked insn falls between sym1 and sym2. */
1774 bfd_vma end_address
= symval
+ irel
->r_addend
;
1775 bfd_vma start_address
= end_address
- x
;
1777 /* Reduce the diff value by count bytes and write it back into section
1780 if (shrinked_insn_address
>= start_address
1781 && shrinked_insn_address
<= end_address
)
1783 switch (ELF32_R_TYPE (irel
->r_info
))
1787 *reloc_contents
= (x
- count
);
1792 bfd_put_16 (abfd
, (x
- count
) & 0xFFFF, reloc_contents
);
1797 bfd_put_32 (abfd
, (x
- count
) & 0xFFFFFFFF, reloc_contents
);
1809 /* Delete some bytes from a section while changing the size of an instruction.
1810 The parameter "addr" denotes the section-relative offset pointing just
1811 behind the shrinked instruction. "addr+count" point at the first
1812 byte just behind the original unshrinked instruction. If delete_shrinks_insn
1813 is FALSE, we are deleting redundant padding bytes from relax_info prop
1814 record handling. In that case, addr is section-relative offset of start
1815 of padding, and count is the number of padding bytes to delete. */
1818 elf32_avr_relax_delete_bytes (bfd
*abfd
,
1822 bfd_boolean delete_shrinks_insn
)
1824 Elf_Internal_Shdr
*symtab_hdr
;
1825 unsigned int sec_shndx
;
1827 Elf_Internal_Rela
*irel
, *irelend
;
1828 Elf_Internal_Sym
*isym
;
1829 Elf_Internal_Sym
*isymbuf
= NULL
;
1830 bfd_vma toaddr
, reloc_toaddr
;
1831 struct elf_link_hash_entry
**sym_hashes
;
1832 struct elf_link_hash_entry
**end_hashes
;
1833 unsigned int symcount
;
1834 struct avr_relax_info
*relax_info
;
1835 struct avr_property_record
*prop_record
= NULL
;
1836 bfd_boolean did_shrink
= FALSE
;
1837 bfd_boolean did_pad
= FALSE
;
1839 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1840 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
1841 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1842 relax_info
= get_avr_relax_info (sec
);
1846 if (relax_info
->records
.count
> 0)
1848 /* There should be no property record within the range of deleted
1849 bytes, however, there might be a property record for ADDR, this is
1850 how we handle alignment directives.
1851 Find the next (if any) property record after the deleted bytes. */
1854 for (i
= 0; i
< relax_info
->records
.count
; ++i
)
1856 bfd_vma offset
= relax_info
->records
.items
[i
].offset
;
1858 BFD_ASSERT (offset
<= addr
|| offset
>= (addr
+ count
));
1859 if (offset
>= (addr
+ count
))
1861 prop_record
= &relax_info
->records
.items
[i
];
1868 /* We need to look at all relocs with offsets less than toaddr. prop
1869 records handling adjusts toaddr downwards to avoid moving syms at the
1870 address of the property record, but all relocs with offsets between addr
1871 and the current value of toaddr need to have their offsets adjusted.
1872 Assume addr = 0, toaddr = 4 and count = 2. After prop records handling,
1873 toaddr becomes 2, but relocs with offsets 2 and 3 still need to be
1874 adjusted (to 0 and 1 respectively), as the first 2 bytes are now gone.
1875 So record the current value of toaddr here, and use it when adjusting
1877 reloc_toaddr
= toaddr
;
1879 irel
= elf_section_data (sec
)->relocs
;
1880 irelend
= irel
+ sec
->reloc_count
;
1882 /* Actually delete the bytes. */
1883 if (toaddr
- addr
- count
> 0)
1885 memmove (contents
+ addr
, contents
+ addr
+ count
,
1886 (size_t) (toaddr
- addr
- count
));
1889 if (prop_record
== NULL
)
1896 /* Use the property record to fill in the bytes we've opened up. */
1898 switch (prop_record
->type
)
1900 case RECORD_ORG_AND_FILL
:
1901 fill
= prop_record
->data
.org
.fill
;
1905 case RECORD_ALIGN_AND_FILL
:
1906 fill
= prop_record
->data
.align
.fill
;
1909 prop_record
->data
.align
.preceding_deleted
+= count
;
1912 /* If toaddr == (addr + count), then we didn't delete anything, yet
1913 we fill count bytes backwards from toaddr. This is still ok - we
1914 end up overwriting the bytes we would have deleted. We just need
1915 to remember we didn't delete anything i.e. don't set did_shrink,
1916 so that we don't corrupt reloc offsets or symbol values.*/
1917 memset (contents
+ toaddr
- count
, fill
, count
);
1920 /* Adjust the TOADDR to avoid moving symbols located at the address
1921 of the property record, which has not moved. */
1928 /* Adjust all the reloc addresses. */
1929 for (irel
= elf_section_data (sec
)->relocs
; irel
< irelend
; irel
++)
1931 bfd_vma old_reloc_address
;
1933 old_reloc_address
= (sec
->output_section
->vma
1934 + sec
->output_offset
+ irel
->r_offset
);
1936 /* Get the new reloc address. */
1937 if ((irel
->r_offset
> addr
1938 && irel
->r_offset
< reloc_toaddr
))
1941 printf ("Relocation at address 0x%x needs to be moved.\n"
1942 "Old section offset: 0x%x, New section offset: 0x%x \n",
1943 (unsigned int) old_reloc_address
,
1944 (unsigned int) irel
->r_offset
,
1945 (unsigned int) ((irel
->r_offset
) - count
));
1947 irel
->r_offset
-= count
;
1952 /* The reloc's own addresses are now ok. However, we need to readjust
1953 the reloc's addend, i.e. the reloc's value if two conditions are met:
1954 1.) the reloc is relative to a symbol in this section that
1955 is located in front of the shrinked instruction
1956 2.) symbol plus addend end up behind the shrinked instruction.
1958 The most common case where this happens are relocs relative to
1959 the section-start symbol.
1961 This step needs to be done for all of the sections of the bfd. */
1964 struct bfd_section
*isec
;
1966 for (isec
= abfd
->sections
; isec
; isec
= isec
->next
)
1969 bfd_vma shrinked_insn_address
;
1971 if (isec
->reloc_count
== 0)
1974 shrinked_insn_address
= (sec
->output_section
->vma
1975 + sec
->output_offset
+ addr
);
1976 if (delete_shrinks_insn
)
1977 shrinked_insn_address
-= count
;
1979 irel
= elf_section_data (isec
)->relocs
;
1980 /* PR 12161: Read in the relocs for this section if necessary. */
1982 irel
= _bfd_elf_link_read_relocs (abfd
, isec
, NULL
, NULL
, TRUE
);
1984 for (irelend
= irel
+ isec
->reloc_count
;
1988 /* Read this BFD's local symbols if we haven't done
1990 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
1992 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1993 if (isymbuf
== NULL
)
1994 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1995 symtab_hdr
->sh_info
, 0,
1997 if (isymbuf
== NULL
)
2001 /* Get the value of the symbol referred to by the reloc. */
2002 if (ELF32_R_SYM (irel
->r_info
) < symtab_hdr
->sh_info
)
2004 /* A local symbol. */
2007 isym
= isymbuf
+ ELF32_R_SYM (irel
->r_info
);
2008 sym_sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2009 symval
= isym
->st_value
;
2010 /* If the reloc is absolute, it will not have
2011 a symbol or section associated with it. */
2014 /* If there is an alignment boundary, we only need to
2015 adjust addends that end up below the boundary. */
2016 bfd_vma shrink_boundary
= (reloc_toaddr
2017 + sec
->output_section
->vma
2018 + sec
->output_offset
);
2019 bfd_boolean addend_within_shrink_boundary
= FALSE
;
2021 symval
+= sym_sec
->output_section
->vma
2022 + sym_sec
->output_offset
;
2025 printf ("Checking if the relocation's "
2026 "addend needs corrections.\n"
2027 "Address of anchor symbol: 0x%x \n"
2028 "Address of relocation target: 0x%x \n"
2029 "Address of relaxed insn: 0x%x \n",
2030 (unsigned int) symval
,
2031 (unsigned int) (symval
+ irel
->r_addend
),
2032 (unsigned int) shrinked_insn_address
);
2034 /* If we padded bytes, then the boundary didn't change,
2035 so there's no need to adjust addends pointing at the boundary.
2036 If we didn't pad, then we actually shrank the boundary, so
2037 addends pointing at the boundary need to be adjusted too. */
2038 addend_within_shrink_boundary
= did_pad
2039 ? ((symval
+ irel
->r_addend
) < shrink_boundary
)
2040 : ((symval
+ irel
->r_addend
) <= shrink_boundary
);
2042 if (symval
<= shrinked_insn_address
2043 && (symval
+ irel
->r_addend
) > shrinked_insn_address
2044 && addend_within_shrink_boundary
)
2046 if (elf32_avr_is_diff_reloc (irel
))
2048 elf32_avr_adjust_diff_reloc_value (abfd
, isec
, irel
,
2050 shrinked_insn_address
,
2054 irel
->r_addend
-= count
;
2057 printf ("Relocation's addend needed to be fixed \n");
2060 /* else...Reference symbol is absolute. No adjustment needed. */
2062 /* else...Reference symbol is extern. No need for adjusting
2068 /* Adjust the local symbols defined in this section. */
2069 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2070 /* Fix PR 9841, there may be no local symbols. */
2073 Elf_Internal_Sym
*isymend
;
2075 isymend
= isym
+ symtab_hdr
->sh_info
;
2076 for (; isym
< isymend
; isym
++)
2078 if (isym
->st_shndx
== sec_shndx
)
2080 if (isym
->st_value
> addr
2081 && isym
->st_value
<= toaddr
)
2082 isym
->st_value
-= count
;
2084 if (isym
->st_value
<= addr
2085 && isym
->st_value
+ isym
->st_size
> addr
)
2087 /* If this assert fires then we have a symbol that ends
2088 part way through an instruction. Does that make
2090 BFD_ASSERT (isym
->st_value
+ isym
->st_size
>= addr
+ count
);
2091 isym
->st_size
-= count
;
2097 /* Now adjust the global symbols defined in this section. */
2098 symcount
= (symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
)
2099 - symtab_hdr
->sh_info
);
2100 sym_hashes
= elf_sym_hashes (abfd
);
2101 end_hashes
= sym_hashes
+ symcount
;
2102 for (; sym_hashes
< end_hashes
; sym_hashes
++)
2104 struct elf_link_hash_entry
*sym_hash
= *sym_hashes
;
2105 if ((sym_hash
->root
.type
== bfd_link_hash_defined
2106 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
2107 && sym_hash
->root
.u
.def
.section
== sec
)
2109 if (sym_hash
->root
.u
.def
.value
> addr
2110 && sym_hash
->root
.u
.def
.value
<= toaddr
)
2111 sym_hash
->root
.u
.def
.value
-= count
;
2113 if (sym_hash
->root
.u
.def
.value
<= addr
2114 && (sym_hash
->root
.u
.def
.value
+ sym_hash
->size
> addr
))
2116 /* If this assert fires then we have a symbol that ends
2117 part way through an instruction. Does that make
2119 BFD_ASSERT (sym_hash
->root
.u
.def
.value
+ sym_hash
->size
2121 sym_hash
->size
-= count
;
2129 static Elf_Internal_Sym
*
2130 retrieve_local_syms (bfd
*input_bfd
)
2132 Elf_Internal_Shdr
*symtab_hdr
;
2133 Elf_Internal_Sym
*isymbuf
;
2136 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2137 locsymcount
= symtab_hdr
->sh_info
;
2139 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2140 if (isymbuf
== NULL
&& locsymcount
!= 0)
2141 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
2144 /* Save the symbols for this input file so they won't be read again. */
2145 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
2146 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
2151 /* Get the input section for a given symbol index.
2153 . a section symbol, return the section;
2154 . a common symbol, return the common section;
2155 . an undefined symbol, return the undefined section;
2156 . an indirect symbol, follow the links;
2157 . an absolute value, return the absolute section. */
2160 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
2162 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2163 asection
*target_sec
= NULL
;
2164 if (r_symndx
< symtab_hdr
->sh_info
)
2166 Elf_Internal_Sym
*isymbuf
;
2167 unsigned int section_index
;
2169 isymbuf
= retrieve_local_syms (abfd
);
2170 section_index
= isymbuf
[r_symndx
].st_shndx
;
2172 if (section_index
== SHN_UNDEF
)
2173 target_sec
= bfd_und_section_ptr
;
2174 else if (section_index
== SHN_ABS
)
2175 target_sec
= bfd_abs_section_ptr
;
2176 else if (section_index
== SHN_COMMON
)
2177 target_sec
= bfd_com_section_ptr
;
2179 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
2183 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
2184 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
2186 while (h
->root
.type
== bfd_link_hash_indirect
2187 || h
->root
.type
== bfd_link_hash_warning
)
2188 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2190 switch (h
->root
.type
)
2192 case bfd_link_hash_defined
:
2193 case bfd_link_hash_defweak
:
2194 target_sec
= h
->root
.u
.def
.section
;
2196 case bfd_link_hash_common
:
2197 target_sec
= bfd_com_section_ptr
;
2199 case bfd_link_hash_undefined
:
2200 case bfd_link_hash_undefweak
:
2201 target_sec
= bfd_und_section_ptr
;
2203 default: /* New indirect warning. */
2204 target_sec
= bfd_und_section_ptr
;
2211 /* Get the section-relative offset for a symbol number. */
2214 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
2216 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2219 if (r_symndx
< symtab_hdr
->sh_info
)
2221 Elf_Internal_Sym
*isymbuf
;
2222 isymbuf
= retrieve_local_syms (abfd
);
2223 offset
= isymbuf
[r_symndx
].st_value
;
2227 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
2228 struct elf_link_hash_entry
*h
=
2229 elf_sym_hashes (abfd
)[indx
];
2231 while (h
->root
.type
== bfd_link_hash_indirect
2232 || h
->root
.type
== bfd_link_hash_warning
)
2233 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2234 if (h
->root
.type
== bfd_link_hash_defined
2235 || h
->root
.type
== bfd_link_hash_defweak
)
2236 offset
= h
->root
.u
.def
.value
;
2241 /* Iterate over the property records in R_LIST, and copy each record into
2242 the list of records within the relaxation information for the section to
2243 which the record applies. */
2246 avr_elf32_assign_records_to_sections (struct avr_property_record_list
*r_list
)
2250 for (i
= 0; i
< r_list
->record_count
; ++i
)
2252 struct avr_relax_info
*relax_info
;
2254 relax_info
= get_avr_relax_info (r_list
->records
[i
].section
);
2255 BFD_ASSERT (relax_info
!= NULL
);
2257 if (relax_info
->records
.count
2258 == relax_info
->records
.allocated
)
2260 /* Allocate more space. */
2263 relax_info
->records
.allocated
+= 10;
2264 size
= (sizeof (struct avr_property_record
)
2265 * relax_info
->records
.allocated
);
2266 relax_info
->records
.items
2267 = bfd_realloc (relax_info
->records
.items
, size
);
2270 memcpy (&relax_info
->records
.items
[relax_info
->records
.count
],
2271 &r_list
->records
[i
],
2272 sizeof (struct avr_property_record
));
2273 relax_info
->records
.count
++;
2277 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2278 ordering callback from QSORT. */
2281 avr_property_record_compare (const void *ap
, const void *bp
)
2283 const struct avr_property_record
*a
2284 = (struct avr_property_record
*) ap
;
2285 const struct avr_property_record
*b
2286 = (struct avr_property_record
*) bp
;
2288 if (a
->offset
!= b
->offset
)
2289 return (a
->offset
- b
->offset
);
2291 if (a
->section
!= b
->section
)
2292 return (bfd_get_section_vma (a
->section
->owner
, a
->section
)
2293 - bfd_get_section_vma (b
->section
->owner
, b
->section
));
2295 return (a
->type
- b
->type
);
2298 /* Load all of the avr property sections from all of the bfd objects
2299 referenced from LINK_INFO. All of the records within each property
2300 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2301 specific data of the appropriate section. */
2304 avr_load_all_property_sections (struct bfd_link_info
*link_info
)
2309 /* Initialize the per-section relaxation info. */
2310 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
2311 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2313 init_avr_relax_info (sec
);
2316 /* Load the descriptor tables from .avr.prop sections. */
2317 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
2319 struct avr_property_record_list
*r_list
;
2321 r_list
= avr_elf32_load_property_records (abfd
);
2323 avr_elf32_assign_records_to_sections (r_list
);
2328 /* Now, for every section, ensure that the descriptor list in the
2329 relaxation data is sorted by ascending offset within the section. */
2330 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
2331 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2333 struct avr_relax_info
*relax_info
= get_avr_relax_info (sec
);
2334 if (relax_info
&& relax_info
->records
.count
> 0)
2338 qsort (relax_info
->records
.items
,
2339 relax_info
->records
.count
,
2340 sizeof (struct avr_property_record
),
2341 avr_property_record_compare
);
2343 /* For debug purposes, list all the descriptors. */
2344 for (i
= 0; i
< relax_info
->records
.count
; ++i
)
2346 switch (relax_info
->records
.items
[i
].type
)
2350 case RECORD_ORG_AND_FILL
:
2354 case RECORD_ALIGN_AND_FILL
:
2362 /* This function handles relaxing for the avr.
2363 Many important relaxing opportunities within functions are already
2364 realized by the compiler itself.
2365 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2366 and jump -> rjmp (safes also 2 bytes).
2367 As well we now optimize seqences of
2368 - call/rcall function
2373 . In case that within a sequence
2376 the ret could no longer be reached it is optimized away. In order
2377 to check if the ret is no longer needed, it is checked that the ret's address
2378 is not the target of a branch or jump within the same section, it is checked
2379 that there is no skip instruction before the jmp/rjmp and that there
2380 is no local or global label place at the address of the ret.
2382 We refrain from relaxing within sections ".vectors" and
2383 ".jumptables" in order to maintain the position of the instructions.
2384 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2385 if possible. (In future one could possibly use the space of the nop
2386 for the first instruction of the irq service function.
2388 The .jumptables sections is meant to be used for a future tablejump variant
2389 for the devices with 3-byte program counter where the table itself
2390 contains 4-byte jump instructions whose relative offset must not
2394 elf32_avr_relax_section (bfd
*abfd
,
2396 struct bfd_link_info
*link_info
,
2399 Elf_Internal_Shdr
*symtab_hdr
;
2400 Elf_Internal_Rela
*internal_relocs
;
2401 Elf_Internal_Rela
*irel
, *irelend
;
2402 bfd_byte
*contents
= NULL
;
2403 Elf_Internal_Sym
*isymbuf
= NULL
;
2404 struct elf32_avr_link_hash_table
*htab
;
2405 static bfd_boolean relaxation_initialised
= FALSE
;
2407 if (!relaxation_initialised
)
2409 relaxation_initialised
= TRUE
;
2411 /* Load entries from the .avr.prop sections. */
2412 avr_load_all_property_sections (link_info
);
2415 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2416 relaxing. Such shrinking can cause issues for the sections such
2417 as .vectors and .jumptables. Instead the unused bytes should be
2418 filled with nop instructions. */
2419 bfd_boolean shrinkable
= TRUE
;
2421 if (!strcmp (sec
->name
,".vectors")
2422 || !strcmp (sec
->name
,".jumptables"))
2425 if (bfd_link_relocatable (link_info
))
2426 (*link_info
->callbacks
->einfo
)
2427 (_("%P%F: --relax and -r may not be used together\n"));
2429 htab
= avr_link_hash_table (link_info
);
2433 /* Assume nothing changes. */
2436 if ((!htab
->no_stubs
) && (sec
== htab
->stub_sec
))
2438 /* We are just relaxing the stub section.
2439 Let's calculate the size needed again. */
2440 bfd_size_type last_estimated_stub_section_size
= htab
->stub_sec
->size
;
2443 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2444 (int) last_estimated_stub_section_size
);
2446 elf32_avr_size_stubs (htab
->stub_sec
->output_section
->owner
,
2449 /* Check if the number of trampolines changed. */
2450 if (last_estimated_stub_section_size
!= htab
->stub_sec
->size
)
2454 printf ("Size of stub section after this pass: %i\n",
2455 (int) htab
->stub_sec
->size
);
2460 /* We don't have to do anything for a relocatable link, if
2461 this section does not have relocs, or if this is not a
2463 if (bfd_link_relocatable (link_info
)
2464 || (sec
->flags
& SEC_RELOC
) == 0
2465 || sec
->reloc_count
== 0
2466 || (sec
->flags
& SEC_CODE
) == 0)
2469 /* Check if the object file to relax uses internal symbols so that we
2470 could fix up the relocations. */
2471 if (!(elf_elfheader (abfd
)->e_flags
& EF_AVR_LINKRELAX_PREPARED
))
2474 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2476 /* Get a copy of the native relocations. */
2477 internal_relocs
= (_bfd_elf_link_read_relocs
2478 (abfd
, sec
, NULL
, NULL
, link_info
->keep_memory
));
2479 if (internal_relocs
== NULL
)
2482 /* Walk through the relocs looking for relaxing opportunities. */
2483 irelend
= internal_relocs
+ sec
->reloc_count
;
2484 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
2488 if ( ELF32_R_TYPE (irel
->r_info
) != R_AVR_13_PCREL
2489 && ELF32_R_TYPE (irel
->r_info
) != R_AVR_7_PCREL
2490 && ELF32_R_TYPE (irel
->r_info
) != R_AVR_CALL
)
2493 /* Get the section contents if we haven't done so already. */
2494 if (contents
== NULL
)
2496 /* Get cached copy if it exists. */
2497 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2498 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2501 /* Go get them off disk. */
2502 if (! bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2507 /* Read this BFD's local symbols if we haven't done so already. */
2508 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
2510 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2511 if (isymbuf
== NULL
)
2512 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
2513 symtab_hdr
->sh_info
, 0,
2515 if (isymbuf
== NULL
)
2520 /* Get the value of the symbol referred to by the reloc. */
2521 if (ELF32_R_SYM (irel
->r_info
) < symtab_hdr
->sh_info
)
2523 /* A local symbol. */
2524 Elf_Internal_Sym
*isym
;
2527 isym
= isymbuf
+ ELF32_R_SYM (irel
->r_info
);
2528 sym_sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2529 symval
= isym
->st_value
;
2530 /* If the reloc is absolute, it will not have
2531 a symbol or section associated with it. */
2533 symval
+= sym_sec
->output_section
->vma
2534 + sym_sec
->output_offset
;
2539 struct elf_link_hash_entry
*h
;
2541 /* An external symbol. */
2542 indx
= ELF32_R_SYM (irel
->r_info
) - symtab_hdr
->sh_info
;
2543 h
= elf_sym_hashes (abfd
)[indx
];
2544 BFD_ASSERT (h
!= NULL
);
2545 if (h
->root
.type
!= bfd_link_hash_defined
2546 && h
->root
.type
!= bfd_link_hash_defweak
)
2547 /* This appears to be a reference to an undefined
2548 symbol. Just ignore it--it will be caught by the
2549 regular reloc processing. */
2552 symval
= (h
->root
.u
.def
.value
2553 + h
->root
.u
.def
.section
->output_section
->vma
2554 + h
->root
.u
.def
.section
->output_offset
);
2557 /* For simplicity of coding, we are going to modify the section
2558 contents, the section relocs, and the BFD symbol table. We
2559 must tell the rest of the code not to free up this
2560 information. It would be possible to instead create a table
2561 of changes which have to be made, as is done in coff-mips.c;
2562 that would be more work, but would require less memory when
2563 the linker is run. */
2564 switch (ELF32_R_TYPE (irel
->r_info
))
2566 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2567 pc-relative rcall/rjmp. */
2570 bfd_vma value
= symval
+ irel
->r_addend
;
2572 int distance_short_enough
= 0;
2574 /* Get the address of this instruction. */
2575 dot
= (sec
->output_section
->vma
2576 + sec
->output_offset
+ irel
->r_offset
);
2578 /* Compute the distance from this insn to the branch target. */
2581 /* Check if the gap falls in the range that can be accommodated
2582 in 13bits signed (It is 12bits when encoded, as we deal with
2583 word addressing). */
2584 if (!shrinkable
&& ((int) gap
>= -4096 && (int) gap
<= 4095))
2585 distance_short_enough
= 1;
2586 /* If shrinkable, then we can check for a range of distance which
2587 is two bytes farther on both the directions because the call
2588 or jump target will be closer by two bytes after the
2590 else if (shrinkable
&& ((int) gap
>= -4094 && (int) gap
<= 4097))
2591 distance_short_enough
= 1;
2593 /* Here we handle the wrap-around case. E.g. for a 16k device
2594 we could use a rjmp to jump from address 0x100 to 0x3d00!
2595 In order to make this work properly, we need to fill the
2596 vaiable avr_pc_wrap_around with the appropriate value.
2597 I.e. 0x4000 for a 16k device. */
2599 /* Shrinking the code size makes the gaps larger in the
2600 case of wrap-arounds. So we use a heuristical safety
2601 margin to avoid that during relax the distance gets
2602 again too large for the short jumps. Let's assume
2603 a typical code-size reduction due to relax for a
2604 16k device of 600 bytes. So let's use twice the
2605 typical value as safety margin. */
2609 int assumed_shrink
= 600;
2610 if (avr_pc_wrap_around
> 0x4000)
2611 assumed_shrink
= 900;
2613 safety_margin
= 2 * assumed_shrink
;
2615 rgap
= avr_relative_distance_considering_wrap_around (gap
);
2617 if (rgap
>= (-4092 + safety_margin
)
2618 && rgap
<= (4094 - safety_margin
))
2619 distance_short_enough
= 1;
2622 if (distance_short_enough
)
2624 unsigned char code_msb
;
2625 unsigned char code_lsb
;
2628 printf ("shrinking jump/call instruction at address 0x%x"
2629 " in section %s\n\n",
2630 (int) dot
, sec
->name
);
2632 /* Note that we've changed the relocs, section contents,
2634 elf_section_data (sec
)->relocs
= internal_relocs
;
2635 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2636 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
2638 /* Get the instruction code for relaxing. */
2639 code_lsb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
);
2640 code_msb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 1);
2642 /* Mask out the relocation bits. */
2645 if (code_msb
== 0x94 && code_lsb
== 0x0E)
2647 /* we are changing call -> rcall . */
2648 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
);
2649 bfd_put_8 (abfd
, 0xD0, contents
+ irel
->r_offset
+ 1);
2651 else if (code_msb
== 0x94 && code_lsb
== 0x0C)
2653 /* we are changeing jump -> rjmp. */
2654 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
);
2655 bfd_put_8 (abfd
, 0xC0, contents
+ irel
->r_offset
+ 1);
2660 /* Fix the relocation's type. */
2661 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
2664 /* We should not modify the ordering if 'shrinkable' is
2668 /* Let's insert a nop. */
2669 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
+ 2);
2670 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
+ 3);
2674 /* Delete two bytes of data. */
2675 if (!elf32_avr_relax_delete_bytes (abfd
, sec
,
2676 irel
->r_offset
+ 2, 2,
2680 /* That will change things, so, we should relax again.
2681 Note that this is not required, and it may be slow. */
2690 unsigned char code_msb
;
2691 unsigned char code_lsb
;
2694 code_msb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 1);
2695 code_lsb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 0);
2697 /* Get the address of this instruction. */
2698 dot
= (sec
->output_section
->vma
2699 + sec
->output_offset
+ irel
->r_offset
);
2701 /* Here we look for rcall/ret or call/ret sequences that could be
2702 safely replaced by rjmp/ret or jmp/ret. */
2703 if (((code_msb
& 0xf0) == 0xd0)
2704 && avr_replace_call_ret_sequences
)
2706 /* This insn is a rcall. */
2707 unsigned char next_insn_msb
= 0;
2708 unsigned char next_insn_lsb
= 0;
2710 if (irel
->r_offset
+ 3 < sec
->size
)
2713 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 3);
2715 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 2);
2718 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
2720 /* The next insn is a ret. We now convert the rcall insn
2721 into a rjmp instruction. */
2723 bfd_put_8 (abfd
, code_msb
, contents
+ irel
->r_offset
+ 1);
2725 printf ("converted rcall/ret sequence at address 0x%x"
2726 " into rjmp/ret sequence. Section is %s\n\n",
2727 (int) dot
, sec
->name
);
2732 else if ((0x94 == (code_msb
& 0xfe))
2733 && (0x0e == (code_lsb
& 0x0e))
2734 && avr_replace_call_ret_sequences
)
2736 /* This insn is a call. */
2737 unsigned char next_insn_msb
= 0;
2738 unsigned char next_insn_lsb
= 0;
2740 if (irel
->r_offset
+ 5 < sec
->size
)
2743 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 5);
2745 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 4);
2748 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
2750 /* The next insn is a ret. We now convert the call insn
2751 into a jmp instruction. */
2754 bfd_put_8 (abfd
, code_lsb
, contents
+ irel
->r_offset
);
2756 printf ("converted call/ret sequence at address 0x%x"
2757 " into jmp/ret sequence. Section is %s\n\n",
2758 (int) dot
, sec
->name
);
2763 else if ((0xc0 == (code_msb
& 0xf0))
2764 || ((0x94 == (code_msb
& 0xfe))
2765 && (0x0c == (code_lsb
& 0x0e))))
2767 /* This insn is a rjmp or a jmp. */
2768 unsigned char next_insn_msb
= 0;
2769 unsigned char next_insn_lsb
= 0;
2772 if (0xc0 == (code_msb
& 0xf0))
2773 insn_size
= 2; /* rjmp insn */
2775 insn_size
= 4; /* jmp insn */
2777 if (irel
->r_offset
+ insn_size
+ 1 < sec
->size
)
2780 bfd_get_8 (abfd
, contents
+ irel
->r_offset
2783 bfd_get_8 (abfd
, contents
+ irel
->r_offset
2787 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
2789 /* The next insn is a ret. We possibly could delete
2790 this ret. First we need to check for preceding
2791 sbis/sbic/sbrs or cpse "skip" instructions. */
2793 int there_is_preceding_non_skip_insn
= 1;
2794 bfd_vma address_of_ret
;
2796 address_of_ret
= dot
+ insn_size
;
2798 if (debug_relax
&& (insn_size
== 2))
2799 printf ("found rjmp / ret sequence at address 0x%x\n",
2801 if (debug_relax
&& (insn_size
== 4))
2802 printf ("found jmp / ret sequence at address 0x%x\n",
2805 /* We have to make sure that there is a preceding insn. */
2806 if (irel
->r_offset
>= 2)
2808 unsigned char preceding_msb
;
2809 unsigned char preceding_lsb
;
2812 bfd_get_8 (abfd
, contents
+ irel
->r_offset
- 1);
2814 bfd_get_8 (abfd
, contents
+ irel
->r_offset
- 2);
2817 if (0x99 == preceding_msb
)
2818 there_is_preceding_non_skip_insn
= 0;
2821 if (0x9b == preceding_msb
)
2822 there_is_preceding_non_skip_insn
= 0;
2825 if ((0xfc == (preceding_msb
& 0xfe)
2826 && (0x00 == (preceding_lsb
& 0x08))))
2827 there_is_preceding_non_skip_insn
= 0;
2830 if ((0xfe == (preceding_msb
& 0xfe)
2831 && (0x00 == (preceding_lsb
& 0x08))))
2832 there_is_preceding_non_skip_insn
= 0;
2835 if (0x10 == (preceding_msb
& 0xfc))
2836 there_is_preceding_non_skip_insn
= 0;
2838 if (there_is_preceding_non_skip_insn
== 0)
2840 printf ("preceding skip insn prevents deletion of"
2841 " ret insn at Addy 0x%x in section %s\n",
2842 (int) dot
+ 2, sec
->name
);
2846 /* There is no previous instruction. */
2847 there_is_preceding_non_skip_insn
= 0;
2850 if (there_is_preceding_non_skip_insn
)
2852 /* We now only have to make sure that there is no
2853 local label defined at the address of the ret
2854 instruction and that there is no local relocation
2855 in this section pointing to the ret. */
2857 int deleting_ret_is_safe
= 1;
2858 unsigned int section_offset_of_ret_insn
=
2859 irel
->r_offset
+ insn_size
;
2860 Elf_Internal_Sym
*isym
, *isymend
;
2861 unsigned int sec_shndx
;
2862 struct bfd_section
*isec
;
2865 _bfd_elf_section_from_bfd_section (abfd
, sec
);
2867 /* Check for local symbols. */
2868 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2869 isymend
= isym
+ symtab_hdr
->sh_info
;
2870 /* PR 6019: There may not be any local symbols. */
2871 for (; isym
!= NULL
&& isym
< isymend
; isym
++)
2873 if (isym
->st_value
== section_offset_of_ret_insn
2874 && isym
->st_shndx
== sec_shndx
)
2876 deleting_ret_is_safe
= 0;
2878 printf ("local label prevents deletion of ret "
2879 "insn at address 0x%x\n",
2880 (int) dot
+ insn_size
);
2884 /* Now check for global symbols. */
2887 struct elf_link_hash_entry
**sym_hashes
;
2888 struct elf_link_hash_entry
**end_hashes
;
2890 symcount
= (symtab_hdr
->sh_size
2891 / sizeof (Elf32_External_Sym
)
2892 - symtab_hdr
->sh_info
);
2893 sym_hashes
= elf_sym_hashes (abfd
);
2894 end_hashes
= sym_hashes
+ symcount
;
2895 for (; sym_hashes
< end_hashes
; sym_hashes
++)
2897 struct elf_link_hash_entry
*sym_hash
=
2899 if ((sym_hash
->root
.type
== bfd_link_hash_defined
2900 || sym_hash
->root
.type
==
2901 bfd_link_hash_defweak
)
2902 && sym_hash
->root
.u
.def
.section
== sec
2903 && sym_hash
->root
.u
.def
.value
== section_offset_of_ret_insn
)
2905 deleting_ret_is_safe
= 0;
2907 printf ("global label prevents deletion of "
2908 "ret insn at address 0x%x\n",
2909 (int) dot
+ insn_size
);
2914 /* Now we check for relocations pointing to ret. */
2915 for (isec
= abfd
->sections
; isec
&& deleting_ret_is_safe
; isec
= isec
->next
)
2917 Elf_Internal_Rela
*rel
;
2918 Elf_Internal_Rela
*relend
;
2920 rel
= elf_section_data (isec
)->relocs
;
2922 rel
= _bfd_elf_link_read_relocs (abfd
, isec
, NULL
, NULL
, TRUE
);
2924 relend
= rel
+ isec
->reloc_count
;
2926 for (; rel
&& rel
< relend
; rel
++)
2928 bfd_vma reloc_target
= 0;
2930 /* Read this BFD's local symbols if we haven't
2932 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
2934 isymbuf
= (Elf_Internal_Sym
*)
2935 symtab_hdr
->contents
;
2936 if (isymbuf
== NULL
)
2937 isymbuf
= bfd_elf_get_elf_syms
2940 symtab_hdr
->sh_info
, 0,
2942 if (isymbuf
== NULL
)
2946 /* Get the value of the symbol referred to
2948 if (ELF32_R_SYM (rel
->r_info
)
2949 < symtab_hdr
->sh_info
)
2951 /* A local symbol. */
2955 + ELF32_R_SYM (rel
->r_info
);
2956 sym_sec
= bfd_section_from_elf_index
2957 (abfd
, isym
->st_shndx
);
2958 symval
= isym
->st_value
;
2960 /* If the reloc is absolute, it will not
2961 have a symbol or section associated
2967 sym_sec
->output_section
->vma
2968 + sym_sec
->output_offset
;
2969 reloc_target
= symval
+ rel
->r_addend
;
2973 reloc_target
= symval
+ rel
->r_addend
;
2974 /* Reference symbol is absolute. */
2977 /* else ... reference symbol is extern. */
2979 if (address_of_ret
== reloc_target
)
2981 deleting_ret_is_safe
= 0;
2984 "rjmp/jmp ret sequence at address"
2985 " 0x%x could not be deleted. ret"
2986 " is target of a relocation.\n",
2987 (int) address_of_ret
);
2993 if (deleting_ret_is_safe
)
2996 printf ("unreachable ret instruction "
2997 "at address 0x%x deleted.\n",
2998 (int) dot
+ insn_size
);
3000 /* Delete two bytes of data. */
3001 if (!elf32_avr_relax_delete_bytes (abfd
, sec
,
3002 irel
->r_offset
+ insn_size
, 2,
3006 /* That will change things, so, we should relax
3007 again. Note that this is not required, and it
3022 /* Look through all the property records in this section to see if
3023 there's any alignment records that can be moved. */
3024 struct avr_relax_info
*relax_info
;
3026 relax_info
= get_avr_relax_info (sec
);
3027 if (relax_info
->records
.count
> 0)
3031 for (i
= 0; i
< relax_info
->records
.count
; ++i
)
3033 switch (relax_info
->records
.items
[i
].type
)
3036 case RECORD_ORG_AND_FILL
:
3039 case RECORD_ALIGN_AND_FILL
:
3041 struct avr_property_record
*record
;
3042 unsigned long bytes_to_align
;
3045 /* Look for alignment directives that have had enough
3046 bytes deleted before them, such that the directive
3047 can be moved backwards and still maintain the
3048 required alignment. */
3049 record
= &relax_info
->records
.items
[i
];
3051 = (unsigned long) (1 << record
->data
.align
.bytes
);
3052 while (record
->data
.align
.preceding_deleted
>=
3055 record
->data
.align
.preceding_deleted
3057 count
+= bytes_to_align
;
3062 bfd_vma addr
= record
->offset
;
3064 /* We can delete COUNT bytes and this alignment
3065 directive will still be correctly aligned.
3066 First move the alignment directive, then delete
3068 record
->offset
-= count
;
3069 elf32_avr_relax_delete_bytes (abfd
, sec
,
3081 if (contents
!= NULL
3082 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3084 if (! link_info
->keep_memory
)
3088 /* Cache the section contents for elf_link_input_bfd. */
3089 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3093 if (internal_relocs
!= NULL
3094 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3095 free (internal_relocs
);
3101 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
3103 if (contents
!= NULL
3104 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3106 if (internal_relocs
!= NULL
3107 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3108 free (internal_relocs
);
3113 /* This is a version of bfd_generic_get_relocated_section_contents
3114 which uses elf32_avr_relocate_section.
3116 For avr it's essentially a cut and paste taken from the H8300 port.
3117 The author of the relaxation support patch for avr had absolutely no
3118 clue what is happening here but found out that this part of the code
3119 seems to be important. */
3122 elf32_avr_get_relocated_section_contents (bfd
*output_bfd
,
3123 struct bfd_link_info
*link_info
,
3124 struct bfd_link_order
*link_order
,
3126 bfd_boolean relocatable
,
3129 Elf_Internal_Shdr
*symtab_hdr
;
3130 asection
*input_section
= link_order
->u
.indirect
.section
;
3131 bfd
*input_bfd
= input_section
->owner
;
3132 asection
**sections
= NULL
;
3133 Elf_Internal_Rela
*internal_relocs
= NULL
;
3134 Elf_Internal_Sym
*isymbuf
= NULL
;
3136 /* We only need to handle the case of relaxing, or of having a
3137 particular set of section contents, specially. */
3139 || elf_section_data (input_section
)->this_hdr
.contents
== NULL
)
3140 return bfd_generic_get_relocated_section_contents (output_bfd
, link_info
,
3144 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
3146 memcpy (data
, elf_section_data (input_section
)->this_hdr
.contents
,
3147 (size_t) input_section
->size
);
3149 if ((input_section
->flags
& SEC_RELOC
) != 0
3150 && input_section
->reloc_count
> 0)
3153 Elf_Internal_Sym
*isym
, *isymend
;
3156 internal_relocs
= (_bfd_elf_link_read_relocs
3157 (input_bfd
, input_section
, NULL
, NULL
, FALSE
));
3158 if (internal_relocs
== NULL
)
3161 if (symtab_hdr
->sh_info
!= 0)
3163 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
3164 if (isymbuf
== NULL
)
3165 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
,
3166 symtab_hdr
->sh_info
, 0,
3168 if (isymbuf
== NULL
)
3172 amt
= symtab_hdr
->sh_info
;
3173 amt
*= sizeof (asection
*);
3174 sections
= bfd_malloc (amt
);
3175 if (sections
== NULL
&& amt
!= 0)
3178 isymend
= isymbuf
+ symtab_hdr
->sh_info
;
3179 for (isym
= isymbuf
, secpp
= sections
; isym
< isymend
; ++isym
, ++secpp
)
3183 if (isym
->st_shndx
== SHN_UNDEF
)
3184 isec
= bfd_und_section_ptr
;
3185 else if (isym
->st_shndx
== SHN_ABS
)
3186 isec
= bfd_abs_section_ptr
;
3187 else if (isym
->st_shndx
== SHN_COMMON
)
3188 isec
= bfd_com_section_ptr
;
3190 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
3195 if (! elf32_avr_relocate_section (output_bfd
, link_info
, input_bfd
,
3196 input_section
, data
, internal_relocs
,
3200 if (sections
!= NULL
)
3203 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
3205 if (elf_section_data (input_section
)->relocs
!= internal_relocs
)
3206 free (internal_relocs
);
3212 if (sections
!= NULL
)
3215 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
3217 if (internal_relocs
!= NULL
3218 && elf_section_data (input_section
)->relocs
!= internal_relocs
)
3219 free (internal_relocs
);
3224 /* Determines the hash entry name for a particular reloc. It consists of
3225 the identifier of the symbol section and the added reloc addend and
3226 symbol offset relative to the section the symbol is attached to. */
3229 avr_stub_name (const asection
*symbol_section
,
3230 const bfd_vma symbol_offset
,
3231 const Elf_Internal_Rela
*rela
)
3236 len
= 8 + 1 + 8 + 1 + 1;
3237 stub_name
= bfd_malloc (len
);
3239 sprintf (stub_name
, "%08x+%08x",
3240 symbol_section
->id
& 0xffffffff,
3241 (unsigned int) ((rela
->r_addend
& 0xffffffff) + symbol_offset
));
3247 /* Add a new stub entry to the stub hash. Not all fields of the new
3248 stub entry are initialised. */
3250 static struct elf32_avr_stub_hash_entry
*
3251 avr_add_stub (const char *stub_name
,
3252 struct elf32_avr_link_hash_table
*htab
)
3254 struct elf32_avr_stub_hash_entry
*hsh
;
3256 /* Enter this entry into the linker stub hash table. */
3257 hsh
= avr_stub_hash_lookup (&htab
->bstab
, stub_name
, TRUE
, FALSE
);
3261 /* xgettext:c-format */
3262 _bfd_error_handler (_("%B: cannot create stub entry %s"),
3267 hsh
->stub_offset
= 0;
3271 /* We assume that there is already space allocated for the stub section
3272 contents and that before building the stubs the section size is
3273 initialized to 0. We assume that within the stub hash table entry,
3274 the absolute position of the jmp target has been written in the
3275 target_value field. We write here the offset of the generated jmp insn
3276 relative to the trampoline section start to the stub_offset entry in
3277 the stub hash table entry. */
3280 avr_build_one_stub (struct bfd_hash_entry
*bh
, void *in_arg
)
3282 struct elf32_avr_stub_hash_entry
*hsh
;
3283 struct bfd_link_info
*info
;
3284 struct elf32_avr_link_hash_table
*htab
;
3291 bfd_vma jmp_insn
= 0x0000940c;
3293 /* Massage our args to the form they really have. */
3294 hsh
= avr_stub_hash_entry (bh
);
3296 if (!hsh
->is_actually_needed
)
3299 info
= (struct bfd_link_info
*) in_arg
;
3301 htab
= avr_link_hash_table (info
);
3305 target
= hsh
->target_value
;
3307 /* Make a note of the offset within the stubs for this entry. */
3308 hsh
->stub_offset
= htab
->stub_sec
->size
;
3309 loc
= htab
->stub_sec
->contents
+ hsh
->stub_offset
;
3311 stub_bfd
= htab
->stub_sec
->owner
;
3314 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3315 (unsigned int) target
,
3316 (unsigned int) hsh
->stub_offset
);
3318 /* We now have to add the information on the jump target to the bare
3319 opcode bits already set in jmp_insn. */
3321 /* Check for the alignment of the address. */
3325 starget
= target
>> 1;
3326 jmp_insn
|= ((starget
& 0x10000) | ((starget
<< 3) & 0x1f00000)) >> 16;
3327 bfd_put_16 (stub_bfd
, jmp_insn
, loc
);
3328 bfd_put_16 (stub_bfd
, (bfd_vma
) starget
& 0xffff, loc
+ 2);
3330 htab
->stub_sec
->size
+= 4;
3332 /* Now add the entries in the address mapping table if there is still
3337 nr
= htab
->amt_entry_cnt
+ 1;
3338 if (nr
<= htab
->amt_max_entry_cnt
)
3340 htab
->amt_entry_cnt
= nr
;
3342 htab
->amt_stub_offsets
[nr
- 1] = hsh
->stub_offset
;
3343 htab
->amt_destination_addr
[nr
- 1] = target
;
3351 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry
*bh
,
3352 void *in_arg ATTRIBUTE_UNUSED
)
3354 struct elf32_avr_stub_hash_entry
*hsh
;
3356 hsh
= avr_stub_hash_entry (bh
);
3357 hsh
->is_actually_needed
= FALSE
;
3363 avr_size_one_stub (struct bfd_hash_entry
*bh
, void *in_arg
)
3365 struct elf32_avr_stub_hash_entry
*hsh
;
3366 struct elf32_avr_link_hash_table
*htab
;
3369 /* Massage our args to the form they really have. */
3370 hsh
= avr_stub_hash_entry (bh
);
3373 if (hsh
->is_actually_needed
)
3378 htab
->stub_sec
->size
+= size
;
3383 elf32_avr_setup_params (struct bfd_link_info
*info
,
3385 asection
*avr_stub_section
,
3386 bfd_boolean no_stubs
,
3387 bfd_boolean deb_stubs
,
3388 bfd_boolean deb_relax
,
3389 bfd_vma pc_wrap_around
,
3390 bfd_boolean call_ret_replacement
)
3392 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
3396 htab
->stub_sec
= avr_stub_section
;
3397 htab
->stub_bfd
= avr_stub_bfd
;
3398 htab
->no_stubs
= no_stubs
;
3400 debug_relax
= deb_relax
;
3401 debug_stubs
= deb_stubs
;
3402 avr_pc_wrap_around
= pc_wrap_around
;
3403 avr_replace_call_ret_sequences
= call_ret_replacement
;
3407 /* Set up various things so that we can make a list of input sections
3408 for each output section included in the link. Returns -1 on error,
3409 0 when no stubs will be needed, and 1 on success. It also sets
3410 information on the stubs bfd and the stub section in the info
3414 elf32_avr_setup_section_lists (bfd
*output_bfd
,
3415 struct bfd_link_info
*info
)
3418 unsigned int bfd_count
;
3419 unsigned int top_id
, top_index
;
3421 asection
**input_list
, **list
;
3423 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
3425 if (htab
== NULL
|| htab
->no_stubs
)
3428 /* Count the number of input BFDs and find the top input section id. */
3429 for (input_bfd
= info
->input_bfds
, bfd_count
= 0, top_id
= 0;
3431 input_bfd
= input_bfd
->link
.next
)
3434 for (section
= input_bfd
->sections
;
3436 section
= section
->next
)
3437 if (top_id
< section
->id
)
3438 top_id
= section
->id
;
3441 htab
->bfd_count
= bfd_count
;
3443 /* We can't use output_bfd->section_count here to find the top output
3444 section index as some sections may have been removed, and
3445 strip_excluded_output_sections doesn't renumber the indices. */
3446 for (section
= output_bfd
->sections
, top_index
= 0;
3448 section
= section
->next
)
3449 if (top_index
< section
->index
)
3450 top_index
= section
->index
;
3452 htab
->top_index
= top_index
;
3453 amt
= sizeof (asection
*) * (top_index
+ 1);
3454 input_list
= bfd_malloc (amt
);
3455 htab
->input_list
= input_list
;
3456 if (input_list
== NULL
)
3459 /* For sections we aren't interested in, mark their entries with a
3460 value we can check later. */
3461 list
= input_list
+ top_index
;
3463 *list
= bfd_abs_section_ptr
;
3464 while (list
-- != input_list
);
3466 for (section
= output_bfd
->sections
;
3468 section
= section
->next
)
3469 if ((section
->flags
& SEC_CODE
) != 0)
3470 input_list
[section
->index
] = NULL
;
3476 /* Read in all local syms for all input bfds, and create hash entries
3477 for export stubs if we are building a multi-subspace shared lib.
3478 Returns -1 on error, 0 otherwise. */
3481 get_local_syms (bfd
*input_bfd
, struct bfd_link_info
*info
)
3483 unsigned int bfd_indx
;
3484 Elf_Internal_Sym
*local_syms
, **all_local_syms
;
3485 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
3491 /* We want to read in symbol extension records only once. To do this
3492 we need to read in the local symbols in parallel and save them for
3493 later use; so hold pointers to the local symbols in an array. */
3494 amt
= sizeof (Elf_Internal_Sym
*) * htab
->bfd_count
;
3495 all_local_syms
= bfd_zmalloc (amt
);
3496 htab
->all_local_syms
= all_local_syms
;
3497 if (all_local_syms
== NULL
)
3500 /* Walk over all the input BFDs, swapping in local symbols.
3501 If we are creating a shared library, create hash entries for the
3505 input_bfd
= input_bfd
->link
.next
, bfd_indx
++)
3507 Elf_Internal_Shdr
*symtab_hdr
;
3509 /* We'll need the symbol table in a second. */
3510 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
3511 if (symtab_hdr
->sh_info
== 0)
3514 /* We need an array of the local symbols attached to the input bfd. */
3515 local_syms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
3516 if (local_syms
== NULL
)
3518 local_syms
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
,
3519 symtab_hdr
->sh_info
, 0,
3521 /* Cache them for elf_link_input_bfd. */
3522 symtab_hdr
->contents
= (unsigned char *) local_syms
;
3524 if (local_syms
== NULL
)
3527 all_local_syms
[bfd_indx
] = local_syms
;
3533 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3536 elf32_avr_size_stubs (bfd
*output_bfd
,
3537 struct bfd_link_info
*info
,
3538 bfd_boolean is_prealloc_run
)
3540 struct elf32_avr_link_hash_table
*htab
;
3541 int stub_changed
= 0;
3543 htab
= avr_link_hash_table (info
);
3547 /* At this point we initialize htab->vector_base
3548 To the start of the text output section. */
3549 htab
->vector_base
= htab
->stub_sec
->output_section
->vma
;
3551 if (get_local_syms (info
->input_bfds
, info
))
3553 if (htab
->all_local_syms
)
3554 goto error_ret_free_local
;
3558 if (ADD_DUMMY_STUBS_FOR_DEBUGGING
)
3560 struct elf32_avr_stub_hash_entry
*test
;
3562 test
= avr_add_stub ("Hugo",htab
);
3563 test
->target_value
= 0x123456;
3564 test
->stub_offset
= 13;
3566 test
= avr_add_stub ("Hugo2",htab
);
3567 test
->target_value
= 0x84210;
3568 test
->stub_offset
= 14;
3574 unsigned int bfd_indx
;
3576 /* We will have to re-generate the stub hash table each time anything
3577 in memory has changed. */
3579 bfd_hash_traverse (&htab
->bstab
, avr_mark_stub_not_to_be_necessary
, htab
);
3580 for (input_bfd
= info
->input_bfds
, bfd_indx
= 0;
3582 input_bfd
= input_bfd
->link
.next
, bfd_indx
++)
3584 Elf_Internal_Shdr
*symtab_hdr
;
3586 Elf_Internal_Sym
*local_syms
;
3588 /* We'll need the symbol table in a second. */
3589 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
3590 if (symtab_hdr
->sh_info
== 0)
3593 local_syms
= htab
->all_local_syms
[bfd_indx
];
3595 /* Walk over each section attached to the input bfd. */
3596 for (section
= input_bfd
->sections
;
3598 section
= section
->next
)
3600 Elf_Internal_Rela
*internal_relocs
, *irelaend
, *irela
;
3602 /* If there aren't any relocs, then there's nothing more
3604 if ((section
->flags
& SEC_RELOC
) == 0
3605 || section
->reloc_count
== 0)
3608 /* If this section is a link-once section that will be
3609 discarded, then don't create any stubs. */
3610 if (section
->output_section
== NULL
3611 || section
->output_section
->owner
!= output_bfd
)
3614 /* Get the relocs. */
3616 = _bfd_elf_link_read_relocs (input_bfd
, section
, NULL
, NULL
,
3618 if (internal_relocs
== NULL
)
3619 goto error_ret_free_local
;
3621 /* Now examine each relocation. */
3622 irela
= internal_relocs
;
3623 irelaend
= irela
+ section
->reloc_count
;
3624 for (; irela
< irelaend
; irela
++)
3626 unsigned int r_type
, r_indx
;
3627 struct elf32_avr_stub_hash_entry
*hsh
;
3630 bfd_vma destination
;
3631 struct elf_link_hash_entry
*hh
;
3634 r_type
= ELF32_R_TYPE (irela
->r_info
);
3635 r_indx
= ELF32_R_SYM (irela
->r_info
);
3637 /* Only look for 16 bit GS relocs. No other reloc will need a
3639 if (!((r_type
== R_AVR_16_PM
)
3640 || (r_type
== R_AVR_LO8_LDI_GS
)
3641 || (r_type
== R_AVR_HI8_LDI_GS
)))
3644 /* Now determine the call target, its name, value,
3650 if (r_indx
< symtab_hdr
->sh_info
)
3652 /* It's a local symbol. */
3653 Elf_Internal_Sym
*sym
;
3654 Elf_Internal_Shdr
*hdr
;
3657 sym
= local_syms
+ r_indx
;
3658 if (ELF_ST_TYPE (sym
->st_info
) != STT_SECTION
)
3659 sym_value
= sym
->st_value
;
3660 shndx
= sym
->st_shndx
;
3661 if (shndx
< elf_numsections (input_bfd
))
3663 hdr
= elf_elfsections (input_bfd
)[shndx
];
3664 sym_sec
= hdr
->bfd_section
;
3665 destination
= (sym_value
+ irela
->r_addend
3666 + sym_sec
->output_offset
3667 + sym_sec
->output_section
->vma
);
3672 /* It's an external symbol. */
3675 e_indx
= r_indx
- symtab_hdr
->sh_info
;
3676 hh
= elf_sym_hashes (input_bfd
)[e_indx
];
3678 while (hh
->root
.type
== bfd_link_hash_indirect
3679 || hh
->root
.type
== bfd_link_hash_warning
)
3680 hh
= (struct elf_link_hash_entry
*)
3681 (hh
->root
.u
.i
.link
);
3683 if (hh
->root
.type
== bfd_link_hash_defined
3684 || hh
->root
.type
== bfd_link_hash_defweak
)
3686 sym_sec
= hh
->root
.u
.def
.section
;
3687 sym_value
= hh
->root
.u
.def
.value
;
3688 if (sym_sec
->output_section
!= NULL
)
3689 destination
= (sym_value
+ irela
->r_addend
3690 + sym_sec
->output_offset
3691 + sym_sec
->output_section
->vma
);
3693 else if (hh
->root
.type
== bfd_link_hash_undefweak
)
3695 if (! bfd_link_pic (info
))
3698 else if (hh
->root
.type
== bfd_link_hash_undefined
)
3700 if (! (info
->unresolved_syms_in_objects
== RM_IGNORE
3701 && (ELF_ST_VISIBILITY (hh
->other
)
3707 bfd_set_error (bfd_error_bad_value
);
3709 error_ret_free_internal
:
3710 if (elf_section_data (section
)->relocs
== NULL
)
3711 free (internal_relocs
);
3712 goto error_ret_free_local
;
3716 if (! avr_stub_is_required_for_16_bit_reloc
3717 (destination
- htab
->vector_base
))
3719 if (!is_prealloc_run
)
3720 /* We are having a reloc that does't need a stub. */
3723 /* We don't right now know if a stub will be needed.
3724 Let's rather be on the safe side. */
3727 /* Get the name of this stub. */
3728 stub_name
= avr_stub_name (sym_sec
, sym_value
, irela
);
3731 goto error_ret_free_internal
;
3734 hsh
= avr_stub_hash_lookup (&htab
->bstab
,
3739 /* The proper stub has already been created. Mark it
3740 to be used and write the possibly changed destination
3742 hsh
->is_actually_needed
= TRUE
;
3743 hsh
->target_value
= destination
;
3748 hsh
= avr_add_stub (stub_name
, htab
);
3752 goto error_ret_free_internal
;
3755 hsh
->is_actually_needed
= TRUE
;
3756 hsh
->target_value
= destination
;
3759 printf ("Adding stub with destination 0x%x to the"
3760 " hash table.\n", (unsigned int) destination
);
3762 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run
);
3764 stub_changed
= TRUE
;
3767 /* We're done with the internal relocs, free them. */
3768 if (elf_section_data (section
)->relocs
== NULL
)
3769 free (internal_relocs
);
3773 /* Re-Calculate the number of needed stubs. */
3774 htab
->stub_sec
->size
= 0;
3775 bfd_hash_traverse (&htab
->bstab
, avr_size_one_stub
, htab
);
3780 stub_changed
= FALSE
;
3783 free (htab
->all_local_syms
);
3786 error_ret_free_local
:
3787 free (htab
->all_local_syms
);
3792 /* Build all the stubs associated with the current output file. The
3793 stubs are kept in a hash table attached to the main linker hash
3794 table. We also set up the .plt entries for statically linked PIC
3795 functions here. This function is called via hppaelf_finish in the
3799 elf32_avr_build_stubs (struct bfd_link_info
*info
)
3802 struct bfd_hash_table
*table
;
3803 struct elf32_avr_link_hash_table
*htab
;
3804 bfd_size_type total_size
= 0;
3806 htab
= avr_link_hash_table (info
);
3810 /* In case that there were several stub sections: */
3811 for (stub_sec
= htab
->stub_bfd
->sections
;
3813 stub_sec
= stub_sec
->next
)
3817 /* Allocate memory to hold the linker stubs. */
3818 size
= stub_sec
->size
;
3821 stub_sec
->contents
= bfd_zalloc (htab
->stub_bfd
, size
);
3822 if (stub_sec
->contents
== NULL
&& size
!= 0)
3827 /* Allocate memory for the adress mapping table. */
3828 htab
->amt_entry_cnt
= 0;
3829 htab
->amt_max_entry_cnt
= total_size
/ 4;
3830 htab
->amt_stub_offsets
= bfd_malloc (sizeof (bfd_vma
)
3831 * htab
->amt_max_entry_cnt
);
3832 htab
->amt_destination_addr
= bfd_malloc (sizeof (bfd_vma
)
3833 * htab
->amt_max_entry_cnt
);
3836 printf ("Allocating %i entries in the AMT\n", htab
->amt_max_entry_cnt
);
3838 /* Build the stubs as directed by the stub hash table. */
3839 table
= &htab
->bstab
;
3840 bfd_hash_traverse (table
, avr_build_one_stub
, info
);
3843 printf ("Final Stub section Size: %i\n", (int) htab
->stub_sec
->size
);
3848 /* Callback used by QSORT to order relocations AP and BP. */
3851 internal_reloc_compare (const void *ap
, const void *bp
)
3853 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
3854 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
3856 if (a
->r_offset
!= b
->r_offset
)
3857 return (a
->r_offset
- b
->r_offset
);
3859 /* We don't need to sort on these criteria for correctness,
3860 but enforcing a more strict ordering prevents unstable qsort
3861 from behaving differently with different implementations.
3862 Without the code below we get correct but different results
3863 on Solaris 2.7 and 2.8. We would like to always produce the
3864 same results no matter the host. */
3866 if (a
->r_info
!= b
->r_info
)
3867 return (a
->r_info
- b
->r_info
);
3869 return (a
->r_addend
- b
->r_addend
);
3872 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3875 avr_is_section_for_address (bfd
*abfd
, asection
*section
, bfd_vma address
)
3880 vma
= bfd_get_section_vma (abfd
, section
);
3884 size
= section
->size
;
3885 if (address
>= vma
+ size
)
3891 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3893 struct avr_find_section_data
3895 /* The address we're looking for. */
3898 /* The section we've found. */
3902 /* Helper function to locate the section holding a certain virtual memory
3903 address. This is called via bfd_map_over_sections. The DATA is an
3904 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3905 has been set to the address to search for, and the section field has
3906 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3907 section field in DATA will be set to SECTION. As an optimisation, if
3908 the section field is already non-null then this function does not
3909 perform any checks, and just returns. */
3912 avr_find_section_for_address (bfd
*abfd
,
3913 asection
*section
, void *data
)
3915 struct avr_find_section_data
*fs_data
3916 = (struct avr_find_section_data
*) data
;
3918 /* Return if already found. */
3919 if (fs_data
->section
!= NULL
)
3922 /* If this section isn't part of the addressable code content, skip it. */
3923 if ((bfd_get_section_flags (abfd
, section
) & SEC_ALLOC
) == 0
3924 && (bfd_get_section_flags (abfd
, section
) & SEC_CODE
) == 0)
3927 if (avr_is_section_for_address (abfd
, section
, fs_data
->address
))
3928 fs_data
->section
= section
;
3931 /* Load all of the property records from SEC, a section from ABFD. Return
3932 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
3933 memory for the returned structure, and all of the records pointed too by
3934 the structure are allocated with a single call to malloc, so, only the
3935 pointer returned needs to be free'd. */
3937 static struct avr_property_record_list
*
3938 avr_elf32_load_records_from_section (bfd
*abfd
, asection
*sec
)
3940 char *contents
= NULL
, *ptr
;
3941 bfd_size_type size
, mem_size
;
3942 bfd_byte version
, flags
;
3943 uint16_t record_count
, i
;
3944 struct avr_property_record_list
*r_list
= NULL
;
3945 Elf_Internal_Rela
*internal_relocs
= NULL
, *rel
, *rel_end
;
3946 struct avr_find_section_data fs_data
;
3948 fs_data
.section
= NULL
;
3950 size
= bfd_get_section_size (sec
);
3951 contents
= bfd_malloc (size
);
3952 bfd_get_section_contents (abfd
, sec
, contents
, 0, size
);
3955 /* Load the relocations for the '.avr.prop' section if there are any, and
3957 internal_relocs
= (_bfd_elf_link_read_relocs
3958 (abfd
, sec
, NULL
, NULL
, FALSE
));
3959 if (internal_relocs
)
3960 qsort (internal_relocs
, sec
->reloc_count
,
3961 sizeof (Elf_Internal_Rela
), internal_reloc_compare
);
3963 /* There is a header at the start of the property record section SEC, the
3964 format of this header is:
3965 uint8_t : version number
3967 uint16_t : record counter
3970 /* Check we have at least got a headers worth of bytes. */
3971 if (size
< AVR_PROPERTY_SECTION_HEADER_SIZE
)
3974 version
= *((bfd_byte
*) ptr
);
3976 flags
= *((bfd_byte
*) ptr
);
3978 record_count
= *((uint16_t *) ptr
);
3980 BFD_ASSERT (ptr
- contents
== AVR_PROPERTY_SECTION_HEADER_SIZE
);
3982 /* Now allocate space for the list structure, and all of the list
3983 elements in a single block. */
3984 mem_size
= sizeof (struct avr_property_record_list
)
3985 + sizeof (struct avr_property_record
) * record_count
;
3986 r_list
= bfd_malloc (mem_size
);
3990 r_list
->version
= version
;
3991 r_list
->flags
= flags
;
3992 r_list
->section
= sec
;
3993 r_list
->record_count
= record_count
;
3994 r_list
->records
= (struct avr_property_record
*) (&r_list
[1]);
3995 size
-= AVR_PROPERTY_SECTION_HEADER_SIZE
;
3997 /* Check that we understand the version number. There is only one
3998 version number right now, anything else is an error. */
3999 if (r_list
->version
!= AVR_PROPERTY_RECORDS_VERSION
)
4002 rel
= internal_relocs
;
4003 rel_end
= rel
+ sec
->reloc_count
;
4004 for (i
= 0; i
< record_count
; ++i
)
4008 /* Each entry is a 32-bit address, followed by a single byte type.
4009 After that is the type specific data. We must take care to
4010 ensure that we don't read beyond the end of the section data. */
4014 r_list
->records
[i
].section
= NULL
;
4015 r_list
->records
[i
].offset
= 0;
4019 /* The offset of the address within the .avr.prop section. */
4020 size_t offset
= ptr
- contents
;
4022 while (rel
< rel_end
&& rel
->r_offset
< offset
)
4027 else if (rel
->r_offset
== offset
)
4029 /* Find section and section offset. */
4030 unsigned long r_symndx
;
4035 r_symndx
= ELF32_R_SYM (rel
->r_info
);
4036 rel_sec
= get_elf_r_symndx_section (abfd
, r_symndx
);
4037 sec_offset
= get_elf_r_symndx_offset (abfd
, r_symndx
)
4040 r_list
->records
[i
].section
= rel_sec
;
4041 r_list
->records
[i
].offset
= sec_offset
;
4045 address
= *((uint32_t *) ptr
);
4049 if (r_list
->records
[i
].section
== NULL
)
4051 /* Try to find section and offset from address. */
4052 if (fs_data
.section
!= NULL
4053 && !avr_is_section_for_address (abfd
, fs_data
.section
,
4055 fs_data
.section
= NULL
;
4057 if (fs_data
.section
== NULL
)
4059 fs_data
.address
= address
;
4060 bfd_map_over_sections (abfd
, avr_find_section_for_address
,
4064 if (fs_data
.section
== NULL
)
4066 fprintf (stderr
, "Failed to find matching section.\n");
4070 r_list
->records
[i
].section
= fs_data
.section
;
4071 r_list
->records
[i
].offset
4072 = address
- bfd_get_section_vma (abfd
, fs_data
.section
);
4075 r_list
->records
[i
].type
= *((bfd_byte
*) ptr
);
4079 switch (r_list
->records
[i
].type
)
4082 /* Nothing else to load. */
4084 case RECORD_ORG_AND_FILL
:
4085 /* Just a 4-byte fill to load. */
4088 r_list
->records
[i
].data
.org
.fill
= *((uint32_t *) ptr
);
4093 /* Just a 4-byte alignment to load. */
4096 r_list
->records
[i
].data
.align
.bytes
= *((uint32_t *) ptr
);
4099 /* Just initialise PRECEDING_DELETED field, this field is
4100 used during linker relaxation. */
4101 r_list
->records
[i
].data
.align
.preceding_deleted
= 0;
4103 case RECORD_ALIGN_AND_FILL
:
4104 /* A 4-byte alignment, and a 4-byte fill to load. */
4107 r_list
->records
[i
].data
.align
.bytes
= *((uint32_t *) ptr
);
4109 r_list
->records
[i
].data
.align
.fill
= *((uint32_t *) ptr
);
4112 /* Just initialise PRECEDING_DELETED field, this field is
4113 used during linker relaxation. */
4114 r_list
->records
[i
].data
.align
.preceding_deleted
= 0;
4122 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
4123 free (internal_relocs
);
4127 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
4128 free (internal_relocs
);
4134 /* Load all of the property records from ABFD. See
4135 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4137 struct avr_property_record_list
*
4138 avr_elf32_load_property_records (bfd
*abfd
)
4142 /* Find the '.avr.prop' section and load the contents into memory. */
4143 sec
= bfd_get_section_by_name (abfd
, AVR_PROPERTY_RECORD_SECTION_NAME
);
4146 return avr_elf32_load_records_from_section (abfd
, sec
);
4150 avr_elf32_property_record_name (struct avr_property_record
*rec
)
4159 case RECORD_ORG_AND_FILL
:
4165 case RECORD_ALIGN_AND_FILL
:
4176 #define ELF_ARCH bfd_arch_avr
4177 #define ELF_TARGET_ID AVR_ELF_DATA
4178 #define ELF_MACHINE_CODE EM_AVR
4179 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4180 #define ELF_MAXPAGESIZE 1
4182 #define TARGET_LITTLE_SYM avr_elf32_vec
4183 #define TARGET_LITTLE_NAME "elf32-avr"
4185 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4187 #define elf_info_to_howto avr_info_to_howto_rela
4188 #define elf_info_to_howto_rel NULL
4189 #define elf_backend_relocate_section elf32_avr_relocate_section
4190 #define elf_backend_can_gc_sections 1
4191 #define elf_backend_rela_normal 1
4192 #define elf_backend_final_write_processing \
4193 bfd_elf_avr_final_write_processing
4194 #define elf_backend_object_p elf32_avr_object_p
4196 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4197 #define bfd_elf32_bfd_get_relocated_section_contents \
4198 elf32_avr_get_relocated_section_contents
4199 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4201 #include "elf32-target.h"