1 /* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999-2018 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,
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 (_("%pB: unsupported relocation type %#x"),
963 cache_ptr->howto = &elf_avr_howto_table[r_type];
967 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
969 return (relocation >= 0x020000);
972 /* Returns the address of the corresponding stub if there is one.
973 Returns otherwise an address above 0x020000. This function
974 could also be used, if there is no knowledge on the section where
975 the destination is found. */
978 avr_get_stub_addr (bfd_vma srel,
979 struct elf32_avr_link_hash_table *htab)
982 bfd_vma stub_sec_addr =
983 (htab->stub_sec->output_section->vma +
984 htab->stub_sec->output_offset);
986 for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
987 if (htab->amt_destination_addr[sindex] == srel)
988 return htab->amt_stub_offsets[sindex] + stub_sec_addr;
990 /* Return an address that could not be reached by 16 bit relocs. */
994 /* Perform a diff relocation. Nothing to do, as the difference value is already
995 written into the section's contents. */
997 static bfd_reloc_status_type
998 bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
999 arelent *reloc_entry ATTRIBUTE_UNUSED,
1000 asymbol *symbol ATTRIBUTE_UNUSED,
1001 void *data ATTRIBUTE_UNUSED,
1002 asection *input_section ATTRIBUTE_UNUSED,
1003 bfd *output_bfd ATTRIBUTE_UNUSED,
1004 char **error_message ATTRIBUTE_UNUSED)
1006 return bfd_reloc_ok;
1010 /* Perform a single relocation. By default we use the standard BFD
1011 routines, but a few relocs, we have to do them ourselves. */
1013 static bfd_reloc_status_type
1014 avr_final_link_relocate (reloc_howto_type * howto,
1016 asection * input_section,
1017 bfd_byte * contents,
1018 Elf_Internal_Rela * rel,
1020 struct elf32_avr_link_hash_table * htab)
1022 bfd_reloc_status_type r = bfd_reloc_ok;
1024 bfd_signed_vma srel;
1025 bfd_signed_vma reloc_addr;
1026 bfd_boolean use_stubs = FALSE;
1027 /* Usually is 0, unless we are generating code for a bootloader. */
1028 bfd_signed_vma base_addr = htab->vector_base;
1030 /* Absolute addr of the reloc in the final excecutable. */
1031 reloc_addr = rel->r_offset + input_section->output_section->vma
1032 + input_section->output_offset;
1034 switch (howto->type)
1037 contents += rel->r_offset;
1038 srel = (bfd_signed_vma) relocation;
1039 srel += rel->r_addend;
1040 srel -= rel->r_offset;
1041 srel -= 2; /* Branch instructions add 2 to the PC... */
1042 srel -= (input_section->output_section->vma +
1043 input_section->output_offset);
1046 return bfd_reloc_outofrange;
1047 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
1048 return bfd_reloc_overflow;
1049 x = bfd_get_16 (input_bfd, contents);
1050 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
1051 bfd_put_16 (input_bfd, x, contents);
1054 case R_AVR_13_PCREL:
1055 contents += rel->r_offset;
1056 srel = (bfd_signed_vma) relocation;
1057 srel += rel->r_addend;
1058 srel -= rel->r_offset;
1059 srel -= 2; /* Branch instructions add 2 to the PC... */
1060 srel -= (input_section->output_section->vma +
1061 input_section->output_offset);
1064 return bfd_reloc_outofrange;
1066 srel = avr_relative_distance_considering_wrap_around (srel);
1068 /* AVR addresses commands as words. */
1071 /* Check for overflow. */
1072 if (srel < -2048 || srel > 2047)
1074 /* Relative distance is too large. */
1076 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1077 switch (bfd_get_mach (input_bfd))
1080 case bfd_mach_avr25:
1085 return bfd_reloc_overflow;
1089 x = bfd_get_16 (input_bfd, contents);
1090 x = (x & 0xf000) | (srel & 0xfff);
1091 bfd_put_16 (input_bfd, x, contents);
1095 contents += rel->r_offset;
1096 srel = (bfd_signed_vma) relocation + rel->r_addend;
1097 x = bfd_get_16 (input_bfd, contents);
1098 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1099 bfd_put_16 (input_bfd, x, contents);
1103 contents += rel->r_offset;
1104 srel = (bfd_signed_vma) relocation + rel->r_addend;
1105 if (((srel > 0) && (srel & 0xffff) > 255)
1106 || ((srel < 0) && ((-srel) & 0xffff) > 128))
1107 /* Remove offset for data/eeprom section. */
1108 return bfd_reloc_overflow;
1110 x = bfd_get_16 (input_bfd, contents);
1111 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1112 bfd_put_16 (input_bfd, x, contents);
1116 contents += rel->r_offset;
1117 srel = (bfd_signed_vma) relocation + rel->r_addend;
1118 if (((srel & 0xffff) > 63) || (srel < 0))
1119 /* Remove offset for data/eeprom section. */
1120 return bfd_reloc_overflow;
1121 x = bfd_get_16 (input_bfd, contents);
1122 x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
1123 | ((srel & (1 << 5)) << 8));
1124 bfd_put_16 (input_bfd, x, contents);
1128 contents += rel->r_offset;
1129 srel = (bfd_signed_vma) relocation + rel->r_addend;
1130 if (((srel & 0xffff) > 63) || (srel < 0))
1131 /* Remove offset for data/eeprom section. */
1132 return bfd_reloc_overflow;
1133 x = bfd_get_16 (input_bfd, contents);
1134 x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
1135 bfd_put_16 (input_bfd, x, contents);
1139 contents += rel->r_offset;
1140 srel = (bfd_signed_vma) relocation + rel->r_addend;
1141 srel = (srel >> 8) & 0xff;
1142 x = bfd_get_16 (input_bfd, contents);
1143 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1144 bfd_put_16 (input_bfd, x, contents);
1148 contents += rel->r_offset;
1149 srel = (bfd_signed_vma) relocation + rel->r_addend;
1150 srel = (srel >> 16) & 0xff;
1151 x = bfd_get_16 (input_bfd, contents);
1152 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1153 bfd_put_16 (input_bfd, x, contents);
1157 contents += rel->r_offset;
1158 srel = (bfd_signed_vma) relocation + rel->r_addend;
1159 srel = (srel >> 24) & 0xff;
1160 x = bfd_get_16 (input_bfd, contents);
1161 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1162 bfd_put_16 (input_bfd, x, contents);
1165 case R_AVR_LO8_LDI_NEG:
1166 contents += rel->r_offset;
1167 srel = (bfd_signed_vma) relocation + rel->r_addend;
1169 x = bfd_get_16 (input_bfd, contents);
1170 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1171 bfd_put_16 (input_bfd, x, contents);
1174 case R_AVR_HI8_LDI_NEG:
1175 contents += rel->r_offset;
1176 srel = (bfd_signed_vma) relocation + rel->r_addend;
1178 srel = (srel >> 8) & 0xff;
1179 x = bfd_get_16 (input_bfd, contents);
1180 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1181 bfd_put_16 (input_bfd, x, contents);
1184 case R_AVR_HH8_LDI_NEG:
1185 contents += rel->r_offset;
1186 srel = (bfd_signed_vma) relocation + rel->r_addend;
1188 srel = (srel >> 16) & 0xff;
1189 x = bfd_get_16 (input_bfd, contents);
1190 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1191 bfd_put_16 (input_bfd, x, contents);
1194 case R_AVR_MS8_LDI_NEG:
1195 contents += rel->r_offset;
1196 srel = (bfd_signed_vma) relocation + rel->r_addend;
1198 srel = (srel >> 24) & 0xff;
1199 x = bfd_get_16 (input_bfd, contents);
1200 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1201 bfd_put_16 (input_bfd, x, contents);
1204 case R_AVR_LO8_LDI_GS:
1205 use_stubs = (!htab->no_stubs);
1207 case R_AVR_LO8_LDI_PM:
1208 contents += rel->r_offset;
1209 srel = (bfd_signed_vma) relocation + rel->r_addend;
1212 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1214 bfd_vma old_srel = srel;
1216 /* We need to use the address of the stub instead. */
1217 srel = avr_get_stub_addr (srel, htab);
1219 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1220 "reloc at address 0x%x.\n",
1221 (unsigned int) srel,
1222 (unsigned int) old_srel,
1223 (unsigned int) reloc_addr);
1225 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1226 return bfd_reloc_outofrange;
1230 return bfd_reloc_outofrange;
1232 x = bfd_get_16 (input_bfd, contents);
1233 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1234 bfd_put_16 (input_bfd, x, contents);
1237 case R_AVR_HI8_LDI_GS:
1238 use_stubs = (!htab->no_stubs);
1240 case R_AVR_HI8_LDI_PM:
1241 contents += rel->r_offset;
1242 srel = (bfd_signed_vma) relocation + rel->r_addend;
1245 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1247 bfd_vma old_srel = srel;
1249 /* We need to use the address of the stub instead. */
1250 srel = avr_get_stub_addr (srel, htab);
1252 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1253 "reloc at address 0x%x.\n",
1254 (unsigned int) srel,
1255 (unsigned int) old_srel,
1256 (unsigned int) reloc_addr);
1258 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1259 return bfd_reloc_outofrange;
1263 return bfd_reloc_outofrange;
1265 srel = (srel >> 8) & 0xff;
1266 x = bfd_get_16 (input_bfd, contents);
1267 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1268 bfd_put_16 (input_bfd, x, contents);
1271 case R_AVR_HH8_LDI_PM:
1272 contents += rel->r_offset;
1273 srel = (bfd_signed_vma) relocation + rel->r_addend;
1275 return bfd_reloc_outofrange;
1277 srel = (srel >> 16) & 0xff;
1278 x = bfd_get_16 (input_bfd, contents);
1279 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1280 bfd_put_16 (input_bfd, x, contents);
1283 case R_AVR_LO8_LDI_PM_NEG:
1284 contents += rel->r_offset;
1285 srel = (bfd_signed_vma) relocation + rel->r_addend;
1288 return bfd_reloc_outofrange;
1290 x = bfd_get_16 (input_bfd, contents);
1291 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1292 bfd_put_16 (input_bfd, x, contents);
1295 case R_AVR_HI8_LDI_PM_NEG:
1296 contents += rel->r_offset;
1297 srel = (bfd_signed_vma) relocation + rel->r_addend;
1300 return bfd_reloc_outofrange;
1302 srel = (srel >> 8) & 0xff;
1303 x = bfd_get_16 (input_bfd, contents);
1304 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1305 bfd_put_16 (input_bfd, x, contents);
1308 case R_AVR_HH8_LDI_PM_NEG:
1309 contents += rel->r_offset;
1310 srel = (bfd_signed_vma) relocation + rel->r_addend;
1313 return bfd_reloc_outofrange;
1315 srel = (srel >> 16) & 0xff;
1316 x = bfd_get_16 (input_bfd, contents);
1317 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1318 bfd_put_16 (input_bfd, x, contents);
1322 contents += rel->r_offset;
1323 srel = (bfd_signed_vma) relocation + rel->r_addend;
1325 return bfd_reloc_outofrange;
1327 x = bfd_get_16 (input_bfd, contents);
1328 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
1329 bfd_put_16 (input_bfd, x, contents);
1330 bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
1334 use_stubs = (!htab->no_stubs);
1335 contents += rel->r_offset;
1336 srel = (bfd_signed_vma) relocation + rel->r_addend;
1339 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1341 bfd_vma old_srel = srel;
1343 /* We need to use the address of the stub instead. */
1344 srel = avr_get_stub_addr (srel,htab);
1346 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1347 "reloc at address 0x%x.\n",
1348 (unsigned int) srel,
1349 (unsigned int) old_srel,
1350 (unsigned int) reloc_addr);
1352 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1353 return bfd_reloc_outofrange;
1357 return bfd_reloc_outofrange;
1359 bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
1365 /* Nothing to do here, as contents already contains the diff value. */
1369 case R_AVR_LDS_STS_16:
1370 contents += rel->r_offset;
1371 srel = (bfd_signed_vma) relocation + rel->r_addend;
1372 if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
1373 return bfd_reloc_outofrange;
1375 x = bfd_get_16 (input_bfd, contents);
1376 x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
1377 bfd_put_16 (input_bfd, x, contents);
1381 contents += rel->r_offset;
1382 srel = (bfd_signed_vma) relocation + rel->r_addend;
1383 if ((srel & 0xffff) > 0x3f)
1384 return bfd_reloc_outofrange;
1385 x = bfd_get_16 (input_bfd, contents);
1386 x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
1387 bfd_put_16 (input_bfd, x, contents);
1391 contents += rel->r_offset;
1392 srel = (bfd_signed_vma) relocation + rel->r_addend;
1393 if ((srel & 0xffff) > 0x1f)
1394 return bfd_reloc_outofrange;
1395 x = bfd_get_16 (input_bfd, contents);
1396 x = (x & 0xff07) | ((srel & 0x1f) << 3);
1397 bfd_put_16 (input_bfd, x, contents);
1401 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1402 contents, rel->r_offset,
1403 relocation, rel->r_addend);
1409 /* Relocate an AVR ELF section. */
1412 elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1413 struct bfd_link_info *info,
1415 asection *input_section,
1417 Elf_Internal_Rela *relocs,
1418 Elf_Internal_Sym *local_syms,
1419 asection **local_sections)
1421 Elf_Internal_Shdr * symtab_hdr;
1422 struct elf_link_hash_entry ** sym_hashes;
1423 Elf_Internal_Rela * rel;
1424 Elf_Internal_Rela * relend;
1425 struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
1430 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1431 sym_hashes = elf_sym_hashes (input_bfd);
1432 relend = relocs + input_section->reloc_count;
1434 for (rel = relocs; rel < relend; rel ++)
1436 reloc_howto_type * howto;
1437 unsigned long r_symndx;
1438 Elf_Internal_Sym * sym;
1440 struct elf_link_hash_entry * h;
1442 bfd_reloc_status_type r;
1446 r_type = ELF32_R_TYPE (rel->r_info);
1447 r_symndx = ELF32_R_SYM (rel->r_info);
1448 howto = elf_avr_howto_table + r_type;
1453 if (r_symndx < symtab_hdr->sh_info)
1455 sym = local_syms + r_symndx;
1456 sec = local_sections [r_symndx];
1457 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1459 name = bfd_elf_string_from_elf_section
1460 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1461 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
1465 bfd_boolean unresolved_reloc, warned, ignored;
1467 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1468 r_symndx, symtab_hdr, sym_hashes,
1470 unresolved_reloc, warned, ignored);
1472 name = h->root.root.string;
1475 if (sec != NULL && discarded_section (sec))
1476 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1477 rel, 1, relend, howto, 0, contents);
1479 if (bfd_link_relocatable (info))
1482 r = avr_final_link_relocate (howto, input_bfd, input_section,
1483 contents, rel, relocation, htab);
1485 if (r != bfd_reloc_ok)
1487 const char * msg = (const char *) NULL;
1491 case bfd_reloc_overflow:
1492 (*info->callbacks->reloc_overflow)
1493 (info, (h ? &h->root : NULL), name, howto->name,
1494 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1497 case bfd_reloc_undefined:
1498 (*info->callbacks->undefined_symbol)
1499 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1502 case bfd_reloc_outofrange:
1503 msg = _("internal error: out of range error");
1506 case bfd_reloc_notsupported:
1507 msg = _("internal error: unsupported relocation error");
1510 case bfd_reloc_dangerous:
1511 msg = _("internal error: dangerous relocation");
1515 msg = _("internal error: unknown error");
1520 (*info->callbacks->warning) (info, msg, name, input_bfd,
1521 input_section, rel->r_offset);
1528 /* The final processing done just before writing out a AVR ELF object
1529 file. This gets the AVR architecture right based on the machine
1533 bfd_elf_avr_final_write_processing (bfd *abfd,
1534 bfd_boolean linker ATTRIBUTE_UNUSED)
1538 switch (bfd_get_mach (abfd))
1542 val = E_AVR_MACH_AVR2;
1546 val = E_AVR_MACH_AVR1;
1549 case bfd_mach_avr25:
1550 val = E_AVR_MACH_AVR25;
1554 val = E_AVR_MACH_AVR3;
1557 case bfd_mach_avr31:
1558 val = E_AVR_MACH_AVR31;
1561 case bfd_mach_avr35:
1562 val = E_AVR_MACH_AVR35;
1566 val = E_AVR_MACH_AVR4;
1570 val = E_AVR_MACH_AVR5;
1573 case bfd_mach_avr51:
1574 val = E_AVR_MACH_AVR51;
1578 val = E_AVR_MACH_AVR6;
1581 case bfd_mach_avrxmega1:
1582 val = E_AVR_MACH_XMEGA1;
1585 case bfd_mach_avrxmega2:
1586 val = E_AVR_MACH_XMEGA2;
1589 case bfd_mach_avrxmega3:
1590 val = E_AVR_MACH_XMEGA3;
1593 case bfd_mach_avrxmega4:
1594 val = E_AVR_MACH_XMEGA4;
1597 case bfd_mach_avrxmega5:
1598 val = E_AVR_MACH_XMEGA5;
1601 case bfd_mach_avrxmega6:
1602 val = E_AVR_MACH_XMEGA6;
1605 case bfd_mach_avrxmega7:
1606 val = E_AVR_MACH_XMEGA7;
1609 case bfd_mach_avrtiny:
1610 val = E_AVR_MACH_AVRTINY;
1614 elf_elfheader (abfd)->e_machine = EM_AVR;
1615 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
1616 elf_elfheader (abfd)->e_flags |= val;
1619 /* Set the right machine number. */
1622 elf32_avr_object_p (bfd *abfd)
1624 unsigned int e_set = bfd_mach_avr2;
1626 if (elf_elfheader (abfd)->e_machine == EM_AVR
1627 || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
1629 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
1634 case E_AVR_MACH_AVR2:
1635 e_set = bfd_mach_avr2;
1638 case E_AVR_MACH_AVR1:
1639 e_set = bfd_mach_avr1;
1642 case E_AVR_MACH_AVR25:
1643 e_set = bfd_mach_avr25;
1646 case E_AVR_MACH_AVR3:
1647 e_set = bfd_mach_avr3;
1650 case E_AVR_MACH_AVR31:
1651 e_set = bfd_mach_avr31;
1654 case E_AVR_MACH_AVR35:
1655 e_set = bfd_mach_avr35;
1658 case E_AVR_MACH_AVR4:
1659 e_set = bfd_mach_avr4;
1662 case E_AVR_MACH_AVR5:
1663 e_set = bfd_mach_avr5;
1666 case E_AVR_MACH_AVR51:
1667 e_set = bfd_mach_avr51;
1670 case E_AVR_MACH_AVR6:
1671 e_set = bfd_mach_avr6;
1674 case E_AVR_MACH_XMEGA1:
1675 e_set = bfd_mach_avrxmega1;
1678 case E_AVR_MACH_XMEGA2:
1679 e_set = bfd_mach_avrxmega2;
1682 case E_AVR_MACH_XMEGA3:
1683 e_set = bfd_mach_avrxmega3;
1686 case E_AVR_MACH_XMEGA4:
1687 e_set = bfd_mach_avrxmega4;
1690 case E_AVR_MACH_XMEGA5:
1691 e_set = bfd_mach_avrxmega5;
1694 case E_AVR_MACH_XMEGA6:
1695 e_set = bfd_mach_avrxmega6;
1698 case E_AVR_MACH_XMEGA7:
1699 e_set = bfd_mach_avrxmega7;
1702 case E_AVR_MACH_AVRTINY:
1703 e_set = bfd_mach_avrtiny;
1707 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
1711 /* Returns whether the relocation type passed is a diff reloc. */
1714 elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
1716 return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
1717 ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
1718 || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
1721 /* Reduce the diff value written in the section by count if the shrinked
1722 insn address happens to fall between the two symbols for which this
1723 diff reloc was emitted. */
1726 elf32_avr_adjust_diff_reloc_value (bfd *abfd,
1727 struct bfd_section *isec,
1728 Elf_Internal_Rela *irel,
1730 bfd_vma shrinked_insn_address,
1733 unsigned char *reloc_contents = NULL;
1734 unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
1735 if (isec_contents == NULL)
1737 if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
1740 elf_section_data (isec)->this_hdr.contents = isec_contents;
1743 reloc_contents = isec_contents + irel->r_offset;
1745 /* Read value written in object file. */
1746 bfd_signed_vma x = 0;
1747 switch (ELF32_R_TYPE (irel->r_info))
1751 x = bfd_get_signed_8 (abfd, reloc_contents);
1756 x = bfd_get_signed_16 (abfd, reloc_contents);
1761 x = bfd_get_signed_32 (abfd, reloc_contents);
1770 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1771 into the object file at the reloc offset. sym2's logical value is
1772 symval (<start_of_section>) + reloc addend. Compute the start and end
1773 addresses and check if the shrinked insn falls between sym1 and sym2. */
1775 bfd_vma sym2_address = symval + irel->r_addend;
1776 bfd_vma sym1_address = sym2_address - x;
1778 /* Don't assume sym2 is bigger than sym1 - the difference
1779 could be negative. Compute start and end addresses, and
1780 use those to see if they span shrinked_insn_address. */
1782 bfd_vma start_address = sym1_address < sym2_address
1783 ? sym1_address : sym2_address;
1784 bfd_vma end_address = sym1_address > sym2_address
1785 ? sym1_address : sym2_address;
1788 if (shrinked_insn_address >= start_address
1789 && shrinked_insn_address < end_address)
1791 /* Reduce the diff value by count bytes and write it back into section
1793 bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
1795 if (sym2_address > shrinked_insn_address)
1796 irel->r_addend -= count;
1798 switch (ELF32_R_TYPE (irel->r_info))
1802 bfd_put_signed_8 (abfd, new_diff, reloc_contents);
1807 bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents);
1812 bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
1825 elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd,
1827 Elf_Internal_Rela *irel, bfd_vma symval,
1828 bfd_vma shrinked_insn_address,
1829 bfd_vma shrink_boundary,
1833 if (elf32_avr_is_diff_reloc (irel))
1835 elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
1837 shrinked_insn_address,
1842 bfd_vma reloc_value = symval + irel->r_addend;
1843 bfd_boolean addend_within_shrink_boundary =
1844 (reloc_value <= shrink_boundary);
1846 bfd_boolean reloc_spans_insn =
1847 (symval <= shrinked_insn_address
1848 && reloc_value > shrinked_insn_address
1849 && addend_within_shrink_boundary);
1851 if (! reloc_spans_insn)
1854 irel->r_addend -= count;
1857 printf ("Relocation's addend needed to be fixed \n");
1862 avr_should_move_sym (symvalue symval,
1865 bfd_boolean did_pad)
1867 bfd_boolean sym_within_boundary =
1868 did_pad ? symval < end : symval <= end;
1869 return (symval > start && sym_within_boundary);
1873 avr_should_reduce_sym_size (symvalue symval,
1877 bfd_boolean did_pad)
1879 bfd_boolean sym_end_within_boundary =
1880 did_pad ? symend < end : symend <= end;
1881 return (symval <= start && symend > start && sym_end_within_boundary);
1885 avr_should_increase_sym_size (symvalue symval,
1889 bfd_boolean did_pad)
1891 return avr_should_move_sym (symval, start, end, did_pad)
1892 && symend >= end && did_pad;
1895 /* Delete some bytes from a section while changing the size of an instruction.
1896 The parameter "addr" denotes the section-relative offset pointing just
1897 behind the shrinked instruction. "addr+count" point at the first
1898 byte just behind the original unshrinked instruction. If delete_shrinks_insn
1899 is FALSE, we are deleting redundant padding bytes from relax_info prop
1900 record handling. In that case, addr is section-relative offset of start
1901 of padding, and count is the number of padding bytes to delete. */
1904 elf32_avr_relax_delete_bytes (bfd *abfd,
1908 bfd_boolean delete_shrinks_insn)
1910 Elf_Internal_Shdr *symtab_hdr;
1911 unsigned int sec_shndx;
1913 Elf_Internal_Rela *irel, *irelend;
1914 Elf_Internal_Sym *isym;
1915 Elf_Internal_Sym *isymbuf = NULL;
1917 struct elf_link_hash_entry **sym_hashes;
1918 struct elf_link_hash_entry **end_hashes;
1919 unsigned int symcount;
1920 struct avr_relax_info *relax_info;
1921 struct avr_property_record *prop_record = NULL;
1922 bfd_boolean did_shrink = FALSE;
1923 bfd_boolean did_pad = FALSE;
1925 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1926 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1927 contents = elf_section_data (sec)->this_hdr.contents;
1928 relax_info = get_avr_relax_info (sec);
1932 if (relax_info->records.count > 0)
1934 /* There should be no property record within the range of deleted
1935 bytes, however, there might be a property record for ADDR, this is
1936 how we handle alignment directives.
1937 Find the next (if any) property record after the deleted bytes. */
1940 for (i = 0; i < relax_info->records.count; ++i)
1942 bfd_vma offset = relax_info->records.items [i].offset;
1944 BFD_ASSERT (offset <= addr || offset >= (addr + count));
1945 if (offset >= (addr + count))
1947 prop_record = &relax_info->records.items [i];
1954 irel = elf_section_data (sec)->relocs;
1955 irelend = irel + sec->reloc_count;
1957 /* Actually delete the bytes. */
1958 if (toaddr - addr - count > 0)
1960 memmove (contents + addr, contents + addr + count,
1961 (size_t) (toaddr - addr - count));
1964 if (prop_record == NULL)
1971 /* Use the property record to fill in the bytes we've opened up. */
1973 switch (prop_record->type)
1975 case RECORD_ORG_AND_FILL:
1976 fill = prop_record->data.org.fill;
1980 case RECORD_ALIGN_AND_FILL:
1981 fill = prop_record->data.align.fill;
1984 prop_record->data.align.preceding_deleted += count;
1987 /* If toaddr == (addr + count), then we didn't delete anything, yet
1988 we fill count bytes backwards from toaddr. This is still ok - we
1989 end up overwriting the bytes we would have deleted. We just need
1990 to remember we didn't delete anything i.e. don't set did_shrink,
1991 so that we don't corrupt reloc offsets or symbol values.*/
1992 memset (contents + toaddr - count, fill, count);
1999 /* Adjust all the reloc addresses. */
2000 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
2002 bfd_vma old_reloc_address;
2004 old_reloc_address = (sec->output_section->vma
2005 + sec->output_offset + irel->r_offset);
2007 /* Get the new reloc address. */
2008 if ((irel->r_offset > addr
2009 && irel->r_offset < toaddr))
2012 printf ("Relocation at address 0x%x needs to be moved.\n"
2013 "Old section offset: 0x%x, New section offset: 0x%x \n",
2014 (unsigned int) old_reloc_address,
2015 (unsigned int) irel->r_offset,
2016 (unsigned int) ((irel->r_offset) - count));
2018 irel->r_offset -= count;
2023 /* The reloc's own addresses are now ok. However, we need to readjust
2024 the reloc's addend, i.e. the reloc's value if two conditions are met:
2025 1.) the reloc is relative to a symbol in this section that
2026 is located in front of the shrinked instruction
2027 2.) symbol plus addend end up behind the shrinked instruction.
2029 The most common case where this happens are relocs relative to
2030 the section-start symbol.
2032 This step needs to be done for all of the sections of the bfd. */
2035 struct bfd_section *isec;
2037 for (isec = abfd->sections; isec; isec = isec->next)
2040 bfd_vma shrinked_insn_address;
2042 if (isec->reloc_count == 0)
2045 shrinked_insn_address = (sec->output_section->vma
2046 + sec->output_offset + addr);
2047 if (delete_shrinks_insn)
2048 shrinked_insn_address -= count;
2050 irel = elf_section_data (isec)->relocs;
2051 /* PR 12161: Read in the relocs for this section if necessary. */
2053 irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2055 for (irelend = irel + isec->reloc_count;
2059 /* Read this BFD's local symbols if we haven't done
2061 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2063 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2064 if (isymbuf == NULL)
2065 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2066 symtab_hdr->sh_info, 0,
2068 if (isymbuf == NULL)
2072 /* Get the value of the symbol referred to by the reloc. */
2073 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2075 /* A local symbol. */
2078 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2079 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2080 symval = isym->st_value;
2081 /* If the reloc is absolute, it will not have
2082 a symbol or section associated with it. */
2085 /* If there is an alignment boundary, we only need to
2086 adjust addends that end up below the boundary. */
2087 bfd_vma shrink_boundary = (toaddr
2088 + sec->output_section->vma
2089 + sec->output_offset);
2091 symval += sym_sec->output_section->vma
2092 + sym_sec->output_offset;
2095 printf ("Checking if the relocation's "
2096 "addend needs corrections.\n"
2097 "Address of anchor symbol: 0x%x \n"
2098 "Address of relocation target: 0x%x \n"
2099 "Address of relaxed insn: 0x%x \n",
2100 (unsigned int) symval,
2101 (unsigned int) (symval + irel->r_addend),
2102 (unsigned int) shrinked_insn_address);
2104 elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel,
2106 shrinked_insn_address,
2110 /* else...Reference symbol is absolute. No adjustment needed. */
2112 /* else...Reference symbol is extern. No need for adjusting
2118 /* Adjust the local symbols defined in this section. */
2119 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2120 /* Fix PR 9841, there may be no local symbols. */
2123 Elf_Internal_Sym *isymend;
2125 isymend = isym + symtab_hdr->sh_info;
2126 for (; isym < isymend; isym++)
2128 if (isym->st_shndx == sec_shndx)
2130 symvalue symval = isym->st_value;
2131 symvalue symend = symval + isym->st_size;
2132 if (avr_should_reduce_sym_size (symval, symend,
2133 addr, toaddr, did_pad))
2135 /* If this assert fires then we have a symbol that ends
2136 part way through an instruction. Does that make
2138 BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
2139 isym->st_size -= count;
2141 else if (avr_should_increase_sym_size (symval, symend,
2142 addr, toaddr, did_pad))
2143 isym->st_size += count;
2145 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2146 isym->st_value -= count;
2151 /* Now adjust the global symbols defined in this section. */
2152 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2153 - symtab_hdr->sh_info);
2154 sym_hashes = elf_sym_hashes (abfd);
2155 end_hashes = sym_hashes + symcount;
2156 for (; sym_hashes < end_hashes; sym_hashes++)
2158 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2159 if ((sym_hash->root.type == bfd_link_hash_defined
2160 || sym_hash->root.type == bfd_link_hash_defweak)
2161 && sym_hash->root.u.def.section == sec)
2163 symvalue symval = sym_hash->root.u.def.value;
2164 symvalue symend = symval + sym_hash->size;
2166 if (avr_should_reduce_sym_size (symval, symend,
2167 addr, toaddr, did_pad))
2169 /* If this assert fires then we have a symbol that ends
2170 part way through an instruction. Does that make
2172 BFD_ASSERT (symend >= addr + count);
2173 sym_hash->size -= count;
2175 else if (avr_should_increase_sym_size (symval, symend,
2176 addr, toaddr, did_pad))
2177 sym_hash->size += count;
2179 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2180 sym_hash->root.u.def.value -= count;
2187 static Elf_Internal_Sym *
2188 retrieve_local_syms (bfd *input_bfd)
2190 Elf_Internal_Shdr *symtab_hdr;
2191 Elf_Internal_Sym *isymbuf;
2194 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2195 locsymcount = symtab_hdr->sh_info;
2197 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2198 if (isymbuf == NULL && locsymcount != 0)
2199 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
2202 /* Save the symbols for this input file so they won't be read again. */
2203 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
2204 symtab_hdr->contents = (unsigned char *) isymbuf;
2209 /* Get the input section for a given symbol index.
2211 . a section symbol, return the section;
2212 . a common symbol, return the common section;
2213 . an undefined symbol, return the undefined section;
2214 . an indirect symbol, follow the links;
2215 . an absolute value, return the absolute section. */
2218 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
2220 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2221 asection *target_sec = NULL;
2222 if (r_symndx < symtab_hdr->sh_info)
2224 Elf_Internal_Sym *isymbuf;
2225 unsigned int section_index;
2227 isymbuf = retrieve_local_syms (abfd);
2228 section_index = isymbuf[r_symndx].st_shndx;
2230 if (section_index == SHN_UNDEF)
2231 target_sec = bfd_und_section_ptr;
2232 else if (section_index == SHN_ABS)
2233 target_sec = bfd_abs_section_ptr;
2234 else if (section_index == SHN_COMMON)
2235 target_sec = bfd_com_section_ptr;
2237 target_sec = bfd_section_from_elf_index (abfd, section_index);
2241 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2242 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
2244 while (h->root.type == bfd_link_hash_indirect
2245 || h->root.type == bfd_link_hash_warning)
2246 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2248 switch (h->root.type)
2250 case bfd_link_hash_defined:
2251 case bfd_link_hash_defweak:
2252 target_sec = h->root.u.def.section;
2254 case bfd_link_hash_common:
2255 target_sec = bfd_com_section_ptr;
2257 case bfd_link_hash_undefined:
2258 case bfd_link_hash_undefweak:
2259 target_sec = bfd_und_section_ptr;
2261 default: /* New indirect warning. */
2262 target_sec = bfd_und_section_ptr;
2269 /* Get the section-relative offset for a symbol number. */
2272 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
2274 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2277 if (r_symndx < symtab_hdr->sh_info)
2279 Elf_Internal_Sym *isymbuf;
2280 isymbuf = retrieve_local_syms (abfd);
2281 offset = isymbuf[r_symndx].st_value;
2285 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2286 struct elf_link_hash_entry *h =
2287 elf_sym_hashes (abfd)[indx];
2289 while (h->root.type == bfd_link_hash_indirect
2290 || h->root.type == bfd_link_hash_warning)
2291 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2292 if (h->root.type == bfd_link_hash_defined
2293 || h->root.type == bfd_link_hash_defweak)
2294 offset = h->root.u.def.value;
2299 /* Iterate over the property records in R_LIST, and copy each record into
2300 the list of records within the relaxation information for the section to
2301 which the record applies. */
2304 avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
2308 for (i = 0; i < r_list->record_count; ++i)
2310 struct avr_relax_info *relax_info;
2312 relax_info = get_avr_relax_info (r_list->records [i].section);
2313 BFD_ASSERT (relax_info != NULL);
2315 if (relax_info->records.count
2316 == relax_info->records.allocated)
2318 /* Allocate more space. */
2321 relax_info->records.allocated += 10;
2322 size = (sizeof (struct avr_property_record)
2323 * relax_info->records.allocated);
2324 relax_info->records.items
2325 = bfd_realloc (relax_info->records.items, size);
2328 memcpy (&relax_info->records.items [relax_info->records.count],
2329 &r_list->records [i],
2330 sizeof (struct avr_property_record));
2331 relax_info->records.count++;
2335 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2336 ordering callback from QSORT. */
2339 avr_property_record_compare (const void *ap, const void *bp)
2341 const struct avr_property_record *a
2342 = (struct avr_property_record *) ap;
2343 const struct avr_property_record *b
2344 = (struct avr_property_record *) bp;
2346 if (a->offset != b->offset)
2347 return (a->offset - b->offset);
2349 if (a->section != b->section)
2350 return (bfd_get_section_vma (a->section->owner, a->section)
2351 - bfd_get_section_vma (b->section->owner, b->section));
2353 return (a->type - b->type);
2356 /* Load all of the avr property sections from all of the bfd objects
2357 referenced from LINK_INFO. All of the records within each property
2358 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2359 specific data of the appropriate section. */
2362 avr_load_all_property_sections (struct bfd_link_info *link_info)
2367 /* Initialize the per-section relaxation info. */
2368 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2369 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2371 init_avr_relax_info (sec);
2374 /* Load the descriptor tables from .avr.prop sections. */
2375 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2377 struct avr_property_record_list *r_list;
2379 r_list = avr_elf32_load_property_records (abfd);
2381 avr_elf32_assign_records_to_sections (r_list);
2386 /* Now, for every section, ensure that the descriptor list in the
2387 relaxation data is sorted by ascending offset within the section. */
2388 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2389 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2391 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
2392 if (relax_info && relax_info->records.count > 0)
2396 qsort (relax_info->records.items,
2397 relax_info->records.count,
2398 sizeof (struct avr_property_record),
2399 avr_property_record_compare);
2401 /* For debug purposes, list all the descriptors. */
2402 for (i = 0; i < relax_info->records.count; ++i)
2404 switch (relax_info->records.items [i].type)
2408 case RECORD_ORG_AND_FILL:
2412 case RECORD_ALIGN_AND_FILL:
2420 /* This function handles relaxing for the avr.
2421 Many important relaxing opportunities within functions are already
2422 realized by the compiler itself.
2423 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2424 and jump -> rjmp (safes also 2 bytes).
2425 As well we now optimize seqences of
2426 - call/rcall function
2431 . In case that within a sequence
2434 the ret could no longer be reached it is optimized away. In order
2435 to check if the ret is no longer needed, it is checked that the ret's address
2436 is not the target of a branch or jump within the same section, it is checked
2437 that there is no skip instruction before the jmp/rjmp and that there
2438 is no local or global label place at the address of the ret.
2440 We refrain from relaxing within sections ".vectors" and
2441 ".jumptables" in order to maintain the position of the instructions.
2442 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2443 if possible. (In future one could possibly use the space of the nop
2444 for the first instruction of the irq service function.
2446 The .jumptables sections is meant to be used for a future tablejump variant
2447 for the devices with 3-byte program counter where the table itself
2448 contains 4-byte jump instructions whose relative offset must not
2452 elf32_avr_relax_section (bfd *abfd,
2454 struct bfd_link_info *link_info,
2457 Elf_Internal_Shdr *symtab_hdr;
2458 Elf_Internal_Rela *internal_relocs;
2459 Elf_Internal_Rela *irel, *irelend;
2460 bfd_byte *contents = NULL;
2461 Elf_Internal_Sym *isymbuf = NULL;
2462 struct elf32_avr_link_hash_table *htab;
2463 static bfd_boolean relaxation_initialised = FALSE;
2465 if (!relaxation_initialised)
2467 relaxation_initialised = TRUE;
2469 /* Load entries from the .avr.prop sections. */
2470 avr_load_all_property_sections (link_info);
2473 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2474 relaxing. Such shrinking can cause issues for the sections such
2475 as .vectors and .jumptables. Instead the unused bytes should be
2476 filled with nop instructions. */
2477 bfd_boolean shrinkable = TRUE;
2479 if (!strcmp (sec->name,".vectors")
2480 || !strcmp (sec->name,".jumptables"))
2483 if (bfd_link_relocatable (link_info))
2484 (*link_info->callbacks->einfo)
2485 (_("%P%F: --relax and -r may not be used together\n"));
2487 htab = avr_link_hash_table (link_info);
2491 /* Assume nothing changes. */
2494 if ((!htab->no_stubs) && (sec == htab->stub_sec))
2496 /* We are just relaxing the stub section.
2497 Let's calculate the size needed again. */
2498 bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
2501 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2502 (int) last_estimated_stub_section_size);
2504 elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
2507 /* Check if the number of trampolines changed. */
2508 if (last_estimated_stub_section_size != htab->stub_sec->size)
2512 printf ("Size of stub section after this pass: %i\n",
2513 (int) htab->stub_sec->size);
2518 /* We don't have to do anything for a relocatable link, if
2519 this section does not have relocs, or if this is not a
2521 if (bfd_link_relocatable (link_info)
2522 || (sec->flags & SEC_RELOC) == 0
2523 || sec->reloc_count == 0
2524 || (sec->flags & SEC_CODE) == 0)
2527 /* Check if the object file to relax uses internal symbols so that we
2528 could fix up the relocations. */
2529 if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
2532 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2534 /* Get a copy of the native relocations. */
2535 internal_relocs = (_bfd_elf_link_read_relocs
2536 (abfd, sec, NULL, NULL, link_info->keep_memory));
2537 if (internal_relocs == NULL)
2540 /* Walk through the relocs looking for relaxing opportunities. */
2541 irelend = internal_relocs + sec->reloc_count;
2542 for (irel = internal_relocs; irel < irelend; irel++)
2546 if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
2547 && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
2548 && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
2551 /* Get the section contents if we haven't done so already. */
2552 if (contents == NULL)
2554 /* Get cached copy if it exists. */
2555 if (elf_section_data (sec)->this_hdr.contents != NULL)
2556 contents = elf_section_data (sec)->this_hdr.contents;
2559 /* Go get them off disk. */
2560 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2565 /* Read this BFD's local symbols if we haven't done so already. */
2566 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2568 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2569 if (isymbuf == NULL)
2570 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2571 symtab_hdr->sh_info, 0,
2573 if (isymbuf == NULL)
2578 /* Get the value of the symbol referred to by the reloc. */
2579 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2581 /* A local symbol. */
2582 Elf_Internal_Sym *isym;
2585 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2586 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2587 symval = isym->st_value;
2588 /* If the reloc is absolute, it will not have
2589 a symbol or section associated with it. */
2591 symval += sym_sec->output_section->vma
2592 + sym_sec->output_offset;
2597 struct elf_link_hash_entry *h;
2599 /* An external symbol. */
2600 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2601 h = elf_sym_hashes (abfd)[indx];
2602 BFD_ASSERT (h != NULL);
2603 if (h->root.type != bfd_link_hash_defined
2604 && h->root.type != bfd_link_hash_defweak)
2605 /* This appears to be a reference to an undefined
2606 symbol. Just ignore it--it will be caught by the
2607 regular reloc processing. */
2610 symval = (h->root.u.def.value
2611 + h->root.u.def.section->output_section->vma
2612 + h->root.u.def.section->output_offset);
2615 /* For simplicity of coding, we are going to modify the section
2616 contents, the section relocs, and the BFD symbol table. We
2617 must tell the rest of the code not to free up this
2618 information. It would be possible to instead create a table
2619 of changes which have to be made, as is done in coff-mips.c;
2620 that would be more work, but would require less memory when
2621 the linker is run. */
2622 switch (ELF32_R_TYPE (irel->r_info))
2624 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2625 pc-relative rcall/rjmp. */
2628 bfd_vma value = symval + irel->r_addend;
2630 int distance_short_enough = 0;
2632 /* Get the address of this instruction. */
2633 dot = (sec->output_section->vma
2634 + sec->output_offset + irel->r_offset);
2636 /* Compute the distance from this insn to the branch target. */
2639 /* Check if the gap falls in the range that can be accommodated
2640 in 13bits signed (It is 12bits when encoded, as we deal with
2641 word addressing). */
2642 if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095))
2643 distance_short_enough = 1;
2644 /* If shrinkable, then we can check for a range of distance which
2645 is two bytes farther on both the directions because the call
2646 or jump target will be closer by two bytes after the
2648 else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097))
2649 distance_short_enough = 1;
2651 /* Here we handle the wrap-around case. E.g. for a 16k device
2652 we could use a rjmp to jump from address 0x100 to 0x3d00!
2653 In order to make this work properly, we need to fill the
2654 vaiable avr_pc_wrap_around with the appropriate value.
2655 I.e. 0x4000 for a 16k device. */
2657 /* Shrinking the code size makes the gaps larger in the
2658 case of wrap-arounds. So we use a heuristical safety
2659 margin to avoid that during relax the distance gets
2660 again too large for the short jumps. Let's assume
2661 a typical code-size reduction due to relax for a
2662 16k device of 600 bytes. So let's use twice the
2663 typical value as safety margin. */
2667 int assumed_shrink = 600;
2668 if (avr_pc_wrap_around > 0x4000)
2669 assumed_shrink = 900;
2671 safety_margin = 2 * assumed_shrink;
2673 rgap = avr_relative_distance_considering_wrap_around (gap);
2675 if (rgap >= (-4092 + safety_margin)
2676 && rgap <= (4094 - safety_margin))
2677 distance_short_enough = 1;
2680 if (distance_short_enough)
2682 unsigned char code_msb;
2683 unsigned char code_lsb;
2686 printf ("shrinking jump/call instruction at address 0x%x"
2687 " in section %s\n\n",
2688 (int) dot, sec->name);
2690 /* Note that we've changed the relocs, section contents,
2692 elf_section_data (sec)->relocs = internal_relocs;
2693 elf_section_data (sec)->this_hdr.contents = contents;
2694 symtab_hdr->contents = (unsigned char *) isymbuf;
2696 /* Get the instruction code for relaxing. */
2697 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
2698 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2700 /* Mask out the relocation bits. */
2703 if (code_msb == 0x94 && code_lsb == 0x0E)
2705 /* we are changing call -> rcall . */
2706 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2707 bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
2709 else if (code_msb == 0x94 && code_lsb == 0x0C)
2711 /* we are changeing jump -> rjmp. */
2712 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2713 bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
2718 /* Fix the relocation's type. */
2719 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2722 /* We should not modify the ordering if 'shrinkable' is
2726 /* Let's insert a nop. */
2727 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
2728 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
2732 /* Delete two bytes of data. */
2733 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2734 irel->r_offset + 2, 2,
2738 /* That will change things, so, we should relax again.
2739 Note that this is not required, and it may be slow. */
2748 unsigned char code_msb;
2749 unsigned char code_lsb;
2752 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2753 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
2755 /* Get the address of this instruction. */
2756 dot = (sec->output_section->vma
2757 + sec->output_offset + irel->r_offset);
2759 /* Here we look for rcall/ret or call/ret sequences that could be
2760 safely replaced by rjmp/ret or jmp/ret. */
2761 if (((code_msb & 0xf0) == 0xd0)
2762 && avr_replace_call_ret_sequences)
2764 /* This insn is a rcall. */
2765 unsigned char next_insn_msb = 0;
2766 unsigned char next_insn_lsb = 0;
2768 if (irel->r_offset + 3 < sec->size)
2771 bfd_get_8 (abfd, contents + irel->r_offset + 3);
2773 bfd_get_8 (abfd, contents + irel->r_offset + 2);
2776 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2778 /* The next insn is a ret. We now convert the rcall insn
2779 into a rjmp instruction. */
2781 bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
2783 printf ("converted rcall/ret sequence at address 0x%x"
2784 " into rjmp/ret sequence. Section is %s\n\n",
2785 (int) dot, sec->name);
2790 else if ((0x94 == (code_msb & 0xfe))
2791 && (0x0e == (code_lsb & 0x0e))
2792 && avr_replace_call_ret_sequences)
2794 /* This insn is a call. */
2795 unsigned char next_insn_msb = 0;
2796 unsigned char next_insn_lsb = 0;
2798 if (irel->r_offset + 5 < sec->size)
2801 bfd_get_8 (abfd, contents + irel->r_offset + 5);
2803 bfd_get_8 (abfd, contents + irel->r_offset + 4);
2806 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2808 /* The next insn is a ret. We now convert the call insn
2809 into a jmp instruction. */
2812 bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
2814 printf ("converted call/ret sequence at address 0x%x"
2815 " into jmp/ret sequence. Section is %s\n\n",
2816 (int) dot, sec->name);
2821 else if ((0xc0 == (code_msb & 0xf0))
2822 || ((0x94 == (code_msb & 0xfe))
2823 && (0x0c == (code_lsb & 0x0e))))
2825 /* This insn is a rjmp or a jmp. */
2826 unsigned char next_insn_msb = 0;
2827 unsigned char next_insn_lsb = 0;
2830 if (0xc0 == (code_msb & 0xf0))
2831 insn_size = 2; /* rjmp insn */
2833 insn_size = 4; /* jmp insn */
2835 if (irel->r_offset + insn_size + 1 < sec->size)
2838 bfd_get_8 (abfd, contents + irel->r_offset
2841 bfd_get_8 (abfd, contents + irel->r_offset
2845 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2847 /* The next insn is a ret. We possibly could delete
2848 this ret. First we need to check for preceding
2849 sbis/sbic/sbrs or cpse "skip" instructions. */
2851 int there_is_preceding_non_skip_insn = 1;
2852 bfd_vma address_of_ret;
2854 address_of_ret = dot + insn_size;
2856 if (debug_relax && (insn_size == 2))
2857 printf ("found rjmp / ret sequence at address 0x%x\n",
2859 if (debug_relax && (insn_size == 4))
2860 printf ("found jmp / ret sequence at address 0x%x\n",
2863 /* We have to make sure that there is a preceding insn. */
2864 if (irel->r_offset >= 2)
2866 unsigned char preceding_msb;
2867 unsigned char preceding_lsb;
2870 bfd_get_8 (abfd, contents + irel->r_offset - 1);
2872 bfd_get_8 (abfd, contents + irel->r_offset - 2);
2875 if (0x99 == preceding_msb)
2876 there_is_preceding_non_skip_insn = 0;
2879 if (0x9b == preceding_msb)
2880 there_is_preceding_non_skip_insn = 0;
2883 if ((0xfc == (preceding_msb & 0xfe)
2884 && (0x00 == (preceding_lsb & 0x08))))
2885 there_is_preceding_non_skip_insn = 0;
2888 if ((0xfe == (preceding_msb & 0xfe)
2889 && (0x00 == (preceding_lsb & 0x08))))
2890 there_is_preceding_non_skip_insn = 0;
2893 if (0x10 == (preceding_msb & 0xfc))
2894 there_is_preceding_non_skip_insn = 0;
2896 if (there_is_preceding_non_skip_insn == 0)
2898 printf ("preceding skip insn prevents deletion of"
2899 " ret insn at Addy 0x%x in section %s\n",
2900 (int) dot + 2, sec->name);
2904 /* There is no previous instruction. */
2905 there_is_preceding_non_skip_insn = 0;
2908 if (there_is_preceding_non_skip_insn)
2910 /* We now only have to make sure that there is no
2911 local label defined at the address of the ret
2912 instruction and that there is no local relocation
2913 in this section pointing to the ret. */
2915 int deleting_ret_is_safe = 1;
2916 unsigned int section_offset_of_ret_insn =
2917 irel->r_offset + insn_size;
2918 Elf_Internal_Sym *isym, *isymend;
2919 unsigned int sec_shndx;
2920 struct bfd_section *isec;
2923 _bfd_elf_section_from_bfd_section (abfd, sec);
2925 /* Check for local symbols. */
2926 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2927 isymend = isym + symtab_hdr->sh_info;
2928 /* PR 6019: There may not be any local symbols. */
2929 for (; isym != NULL && isym < isymend; isym++)
2931 if (isym->st_value == section_offset_of_ret_insn
2932 && isym->st_shndx == sec_shndx)
2934 deleting_ret_is_safe = 0;
2936 printf ("local label prevents deletion of ret "
2937 "insn at address 0x%x\n",
2938 (int) dot + insn_size);
2942 /* Now check for global symbols. */
2945 struct elf_link_hash_entry **sym_hashes;
2946 struct elf_link_hash_entry **end_hashes;
2948 symcount = (symtab_hdr->sh_size
2949 / sizeof (Elf32_External_Sym)
2950 - symtab_hdr->sh_info);
2951 sym_hashes = elf_sym_hashes (abfd);
2952 end_hashes = sym_hashes + symcount;
2953 for (; sym_hashes < end_hashes; sym_hashes++)
2955 struct elf_link_hash_entry *sym_hash =
2957 if ((sym_hash->root.type == bfd_link_hash_defined
2958 || sym_hash->root.type ==
2959 bfd_link_hash_defweak)
2960 && sym_hash->root.u.def.section == sec
2961 && sym_hash->root.u.def.value == section_offset_of_ret_insn)
2963 deleting_ret_is_safe = 0;
2965 printf ("global label prevents deletion of "
2966 "ret insn at address 0x%x\n",
2967 (int) dot + insn_size);
2972 /* Now we check for relocations pointing to ret. */
2973 for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
2975 Elf_Internal_Rela *rel;
2976 Elf_Internal_Rela *relend;
2978 rel = elf_section_data (isec)->relocs;
2980 rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2982 relend = rel + isec->reloc_count;
2984 for (; rel && rel < relend; rel++)
2986 bfd_vma reloc_target = 0;
2988 /* Read this BFD's local symbols if we haven't
2990 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2992 isymbuf = (Elf_Internal_Sym *)
2993 symtab_hdr->contents;
2994 if (isymbuf == NULL)
2995 isymbuf = bfd_elf_get_elf_syms
2998 symtab_hdr->sh_info, 0,
3000 if (isymbuf == NULL)
3004 /* Get the value of the symbol referred to
3006 if (ELF32_R_SYM (rel->r_info)
3007 < symtab_hdr->sh_info)
3009 /* A local symbol. */
3013 + ELF32_R_SYM (rel->r_info);
3014 sym_sec = bfd_section_from_elf_index
3015 (abfd, isym->st_shndx);
3016 symval = isym->st_value;
3018 /* If the reloc is absolute, it will not
3019 have a symbol or section associated
3025 sym_sec->output_section->vma
3026 + sym_sec->output_offset;
3027 reloc_target = symval + rel->r_addend;
3031 reloc_target = symval + rel->r_addend;
3032 /* Reference symbol is absolute. */
3035 /* else ... reference symbol is extern. */
3037 if (address_of_ret == reloc_target)
3039 deleting_ret_is_safe = 0;
3042 "rjmp/jmp ret sequence at address"
3043 " 0x%x could not be deleted. ret"
3044 " is target of a relocation.\n",
3045 (int) address_of_ret);
3051 if (deleting_ret_is_safe)
3054 printf ("unreachable ret instruction "
3055 "at address 0x%x deleted.\n",
3056 (int) dot + insn_size);
3058 /* Delete two bytes of data. */
3059 if (!elf32_avr_relax_delete_bytes (abfd, sec,
3060 irel->r_offset + insn_size, 2,
3064 /* That will change things, so, we should relax
3065 again. Note that this is not required, and it
3080 /* Look through all the property records in this section to see if
3081 there's any alignment records that can be moved. */
3082 struct avr_relax_info *relax_info;
3084 relax_info = get_avr_relax_info (sec);
3085 if (relax_info->records.count > 0)
3089 for (i = 0; i < relax_info->records.count; ++i)
3091 switch (relax_info->records.items [i].type)
3094 case RECORD_ORG_AND_FILL:
3097 case RECORD_ALIGN_AND_FILL:
3099 struct avr_property_record *record;
3100 unsigned long bytes_to_align;
3103 /* Look for alignment directives that have had enough
3104 bytes deleted before them, such that the directive
3105 can be moved backwards and still maintain the
3106 required alignment. */
3107 record = &relax_info->records.items [i];
3109 = (unsigned long) (1 << record->data.align.bytes);
3110 while (record->data.align.preceding_deleted >=
3113 record->data.align.preceding_deleted
3115 count += bytes_to_align;
3120 bfd_vma addr = record->offset;
3122 /* We can delete COUNT bytes and this alignment
3123 directive will still be correctly aligned.
3124 First move the alignment directive, then delete
3126 record->offset -= count;
3127 elf32_avr_relax_delete_bytes (abfd, sec,
3139 if (contents != NULL
3140 && elf_section_data (sec)->this_hdr.contents != contents)
3142 if (! link_info->keep_memory)
3146 /* Cache the section contents for elf_link_input_bfd. */
3147 elf_section_data (sec)->this_hdr.contents = contents;
3151 if (internal_relocs != NULL
3152 && elf_section_data (sec)->relocs != internal_relocs)
3153 free (internal_relocs);
3159 && symtab_hdr->contents != (unsigned char *) isymbuf)
3161 if (contents != NULL
3162 && elf_section_data (sec)->this_hdr.contents != contents)
3164 if (internal_relocs != NULL
3165 && elf_section_data (sec)->relocs != internal_relocs)
3166 free (internal_relocs);
3171 /* This is a version of bfd_generic_get_relocated_section_contents
3172 which uses elf32_avr_relocate_section.
3174 For avr it's essentially a cut and paste taken from the H8300 port.
3175 The author of the relaxation support patch for avr had absolutely no
3176 clue what is happening here but found out that this part of the code
3177 seems to be important. */
3180 elf32_avr_get_relocated_section_contents (bfd *output_bfd,
3181 struct bfd_link_info *link_info,
3182 struct bfd_link_order *link_order,
3184 bfd_boolean relocatable,
3187 Elf_Internal_Shdr *symtab_hdr;
3188 asection *input_section = link_order->u.indirect.section;
3189 bfd *input_bfd = input_section->owner;
3190 asection **sections = NULL;
3191 Elf_Internal_Rela *internal_relocs = NULL;
3192 Elf_Internal_Sym *isymbuf = NULL;
3194 /* We only need to handle the case of relaxing, or of having a
3195 particular set of section contents, specially. */
3197 || elf_section_data (input_section)->this_hdr.contents == NULL)
3198 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3202 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3204 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3205 (size_t) input_section->size);
3207 if ((input_section->flags & SEC_RELOC) != 0
3208 && input_section->reloc_count > 0)
3211 Elf_Internal_Sym *isym, *isymend;
3214 internal_relocs = (_bfd_elf_link_read_relocs
3215 (input_bfd, input_section, NULL, NULL, FALSE));
3216 if (internal_relocs == NULL)
3219 if (symtab_hdr->sh_info != 0)
3221 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3222 if (isymbuf == NULL)
3223 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3224 symtab_hdr->sh_info, 0,
3226 if (isymbuf == NULL)
3230 amt = symtab_hdr->sh_info;
3231 amt *= sizeof (asection *);
3232 sections = bfd_malloc (amt);
3233 if (sections == NULL && amt != 0)
3236 isymend = isymbuf + symtab_hdr->sh_info;
3237 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3241 if (isym->st_shndx == SHN_UNDEF)
3242 isec = bfd_und_section_ptr;
3243 else if (isym->st_shndx == SHN_ABS)
3244 isec = bfd_abs_section_ptr;
3245 else if (isym->st_shndx == SHN_COMMON)
3246 isec = bfd_com_section_ptr;
3248 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3253 if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
3254 input_section, data, internal_relocs,
3258 if (sections != NULL)
3261 && symtab_hdr->contents != (unsigned char *) isymbuf)
3263 if (elf_section_data (input_section)->relocs != internal_relocs)
3264 free (internal_relocs);
3270 if (sections != NULL)
3273 && symtab_hdr->contents != (unsigned char *) isymbuf)
3275 if (internal_relocs != NULL
3276 && elf_section_data (input_section)->relocs != internal_relocs)
3277 free (internal_relocs);
3282 /* Determines the hash entry name for a particular reloc. It consists of
3283 the identifier of the symbol section and the added reloc addend and
3284 symbol offset relative to the section the symbol is attached to. */
3287 avr_stub_name (const asection *symbol_section,
3288 const bfd_vma symbol_offset,
3289 const Elf_Internal_Rela *rela)
3294 len = 8 + 1 + 8 + 1 + 1;
3295 stub_name = bfd_malloc (len);
3297 sprintf (stub_name, "%08x+%08x",
3298 symbol_section->id & 0xffffffff,
3299 (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
3305 /* Add a new stub entry to the stub hash. Not all fields of the new
3306 stub entry are initialised. */
3308 static struct elf32_avr_stub_hash_entry *
3309 avr_add_stub (const char *stub_name,
3310 struct elf32_avr_link_hash_table *htab)
3312 struct elf32_avr_stub_hash_entry *hsh;
3314 /* Enter this entry into the linker stub hash table. */
3315 hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);
3319 /* xgettext:c-format */
3320 _bfd_error_handler (_("cannot create stub entry %s"), stub_name);
3324 hsh->stub_offset = 0;
3328 /* We assume that there is already space allocated for the stub section
3329 contents and that before building the stubs the section size is
3330 initialized to 0. We assume that within the stub hash table entry,
3331 the absolute position of the jmp target has been written in the
3332 target_value field. We write here the offset of the generated jmp insn
3333 relative to the trampoline section start to the stub_offset entry in
3334 the stub hash table entry. */
3337 avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3339 struct elf32_avr_stub_hash_entry *hsh;
3340 struct bfd_link_info *info;
3341 struct elf32_avr_link_hash_table *htab;
3348 bfd_vma jmp_insn = 0x0000940c;
3350 /* Massage our args to the form they really have. */
3351 hsh = avr_stub_hash_entry (bh);
3353 if (!hsh->is_actually_needed)
3356 info = (struct bfd_link_info *) in_arg;
3358 htab = avr_link_hash_table (info);
3362 target = hsh->target_value;
3364 /* Make a note of the offset within the stubs for this entry. */
3365 hsh->stub_offset = htab->stub_sec->size;
3366 loc = htab->stub_sec->contents + hsh->stub_offset;
3368 stub_bfd = htab->stub_sec->owner;
3371 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3372 (unsigned int) target,
3373 (unsigned int) hsh->stub_offset);
3375 /* We now have to add the information on the jump target to the bare
3376 opcode bits already set in jmp_insn. */
3378 /* Check for the alignment of the address. */
3382 starget = target >> 1;
3383 jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
3384 bfd_put_16 (stub_bfd, jmp_insn, loc);
3385 bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
3387 htab->stub_sec->size += 4;
3389 /* Now add the entries in the address mapping table if there is still
3394 nr = htab->amt_entry_cnt + 1;
3395 if (nr <= htab->amt_max_entry_cnt)
3397 htab->amt_entry_cnt = nr;
3399 htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
3400 htab->amt_destination_addr[nr - 1] = target;
3408 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
3409 void *in_arg ATTRIBUTE_UNUSED)
3411 struct elf32_avr_stub_hash_entry *hsh;
3413 hsh = avr_stub_hash_entry (bh);
3414 hsh->is_actually_needed = FALSE;
3420 avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3422 struct elf32_avr_stub_hash_entry *hsh;
3423 struct elf32_avr_link_hash_table *htab;
3426 /* Massage our args to the form they really have. */
3427 hsh = avr_stub_hash_entry (bh);
3430 if (hsh->is_actually_needed)
3435 htab->stub_sec->size += size;
3440 elf32_avr_setup_params (struct bfd_link_info *info,
3442 asection *avr_stub_section,
3443 bfd_boolean no_stubs,
3444 bfd_boolean deb_stubs,
3445 bfd_boolean deb_relax,
3446 bfd_vma pc_wrap_around,
3447 bfd_boolean call_ret_replacement)
3449 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3453 htab->stub_sec = avr_stub_section;
3454 htab->stub_bfd = avr_stub_bfd;
3455 htab->no_stubs = no_stubs;
3457 debug_relax = deb_relax;
3458 debug_stubs = deb_stubs;
3459 avr_pc_wrap_around = pc_wrap_around;
3460 avr_replace_call_ret_sequences = call_ret_replacement;
3464 /* Set up various things so that we can make a list of input sections
3465 for each output section included in the link. Returns -1 on error,
3466 0 when no stubs will be needed, and 1 on success. It also sets
3467 information on the stubs bfd and the stub section in the info
3471 elf32_avr_setup_section_lists (bfd *output_bfd,
3472 struct bfd_link_info *info)
3475 unsigned int bfd_count;
3476 unsigned int top_id, top_index;
3478 asection **input_list, **list;
3480 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3482 if (htab == NULL || htab->no_stubs)
3485 /* Count the number of input BFDs and find the top input section id. */
3486 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3488 input_bfd = input_bfd->link.next)
3491 for (section = input_bfd->sections;
3493 section = section->next)
3494 if (top_id < section->id)
3495 top_id = section->id;
3498 htab->bfd_count = bfd_count;
3500 /* We can't use output_bfd->section_count here to find the top output
3501 section index as some sections may have been removed, and
3502 strip_excluded_output_sections doesn't renumber the indices. */
3503 for (section = output_bfd->sections, top_index = 0;
3505 section = section->next)
3506 if (top_index < section->index)
3507 top_index = section->index;
3509 htab->top_index = top_index;
3510 amt = sizeof (asection *) * (top_index + 1);
3511 input_list = bfd_malloc (amt);
3512 htab->input_list = input_list;
3513 if (input_list == NULL)
3516 /* For sections we aren't interested in, mark their entries with a
3517 value we can check later. */
3518 list = input_list + top_index;
3520 *list = bfd_abs_section_ptr;
3521 while (list-- != input_list);
3523 for (section = output_bfd->sections;
3525 section = section->next)
3526 if ((section->flags & SEC_CODE) != 0)
3527 input_list[section->index] = NULL;
3533 /* Read in all local syms for all input bfds, and create hash entries
3534 for export stubs if we are building a multi-subspace shared lib.
3535 Returns -1 on error, 0 otherwise. */
3538 get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
3540 unsigned int bfd_indx;
3541 Elf_Internal_Sym *local_syms, **all_local_syms;
3542 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3548 /* We want to read in symbol extension records only once. To do this
3549 we need to read in the local symbols in parallel and save them for
3550 later use; so hold pointers to the local symbols in an array. */
3551 amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3552 all_local_syms = bfd_zmalloc (amt);
3553 htab->all_local_syms = all_local_syms;
3554 if (all_local_syms == NULL)
3557 /* Walk over all the input BFDs, swapping in local symbols.
3558 If we are creating a shared library, create hash entries for the
3562 input_bfd = input_bfd->link.next, bfd_indx++)
3564 Elf_Internal_Shdr *symtab_hdr;
3566 /* We'll need the symbol table in a second. */
3567 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3568 if (symtab_hdr->sh_info == 0)
3571 /* We need an array of the local symbols attached to the input bfd. */
3572 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3573 if (local_syms == NULL)
3575 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3576 symtab_hdr->sh_info, 0,
3578 /* Cache them for elf_link_input_bfd. */
3579 symtab_hdr->contents = (unsigned char *) local_syms;
3581 if (local_syms == NULL)
3584 all_local_syms[bfd_indx] = local_syms;
3590 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3593 elf32_avr_size_stubs (bfd *output_bfd,
3594 struct bfd_link_info *info,
3595 bfd_boolean is_prealloc_run)
3597 struct elf32_avr_link_hash_table *htab;
3598 int stub_changed = 0;
3600 htab = avr_link_hash_table (info);
3604 /* At this point we initialize htab->vector_base
3605 To the start of the text output section. */
3606 htab->vector_base = htab->stub_sec->output_section->vma;
3608 if (get_local_syms (info->input_bfds, info))
3610 if (htab->all_local_syms)
3611 goto error_ret_free_local;
3615 if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
3617 struct elf32_avr_stub_hash_entry *test;
3619 test = avr_add_stub ("Hugo",htab);
3620 test->target_value = 0x123456;
3621 test->stub_offset = 13;
3623 test = avr_add_stub ("Hugo2",htab);
3624 test->target_value = 0x84210;
3625 test->stub_offset = 14;
3631 unsigned int bfd_indx;
3633 /* We will have to re-generate the stub hash table each time anything
3634 in memory has changed. */
3636 bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
3637 for (input_bfd = info->input_bfds, bfd_indx = 0;
3639 input_bfd = input_bfd->link.next, bfd_indx++)
3641 Elf_Internal_Shdr *symtab_hdr;
3643 Elf_Internal_Sym *local_syms;
3645 /* We'll need the symbol table in a second. */
3646 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3647 if (symtab_hdr->sh_info == 0)
3650 local_syms = htab->all_local_syms[bfd_indx];
3652 /* Walk over each section attached to the input bfd. */
3653 for (section = input_bfd->sections;
3655 section = section->next)
3657 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3659 /* If there aren't any relocs, then there's nothing more
3661 if ((section->flags & SEC_RELOC) == 0
3662 || section->reloc_count == 0)
3665 /* If this section is a link-once section that will be
3666 discarded, then don't create any stubs. */
3667 if (section->output_section == NULL
3668 || section->output_section->owner != output_bfd)
3671 /* Get the relocs. */
3673 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3675 if (internal_relocs == NULL)
3676 goto error_ret_free_local;
3678 /* Now examine each relocation. */
3679 irela = internal_relocs;
3680 irelaend = irela + section->reloc_count;
3681 for (; irela < irelaend; irela++)
3683 unsigned int r_type, r_indx;
3684 struct elf32_avr_stub_hash_entry *hsh;
3687 bfd_vma destination;
3688 struct elf_link_hash_entry *hh;
3691 r_type = ELF32_R_TYPE (irela->r_info);
3692 r_indx = ELF32_R_SYM (irela->r_info);
3694 /* Only look for 16 bit GS relocs. No other reloc will need a
3696 if (!((r_type == R_AVR_16_PM)
3697 || (r_type == R_AVR_LO8_LDI_GS)
3698 || (r_type == R_AVR_HI8_LDI_GS)))
3701 /* Now determine the call target, its name, value,
3707 if (r_indx < symtab_hdr->sh_info)
3709 /* It's a local symbol. */
3710 Elf_Internal_Sym *sym;
3711 Elf_Internal_Shdr *hdr;
3714 sym = local_syms + r_indx;
3715 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3716 sym_value = sym->st_value;
3717 shndx = sym->st_shndx;
3718 if (shndx < elf_numsections (input_bfd))
3720 hdr = elf_elfsections (input_bfd)[shndx];
3721 sym_sec = hdr->bfd_section;
3722 destination = (sym_value + irela->r_addend
3723 + sym_sec->output_offset
3724 + sym_sec->output_section->vma);
3729 /* It's an external symbol. */
3732 e_indx = r_indx - symtab_hdr->sh_info;
3733 hh = elf_sym_hashes (input_bfd)[e_indx];
3735 while (hh->root.type == bfd_link_hash_indirect
3736 || hh->root.type == bfd_link_hash_warning)
3737 hh = (struct elf_link_hash_entry *)
3738 (hh->root.u.i.link);
3740 if (hh->root.type == bfd_link_hash_defined
3741 || hh->root.type == bfd_link_hash_defweak)
3743 sym_sec = hh->root.u.def.section;
3744 sym_value = hh->root.u.def.value;
3745 if (sym_sec->output_section != NULL)
3746 destination = (sym_value + irela->r_addend
3747 + sym_sec->output_offset
3748 + sym_sec->output_section->vma);
3750 else if (hh->root.type == bfd_link_hash_undefweak)
3752 if (! bfd_link_pic (info))
3755 else if (hh->root.type == bfd_link_hash_undefined)
3757 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3758 && (ELF_ST_VISIBILITY (hh->other)
3764 bfd_set_error (bfd_error_bad_value);
3766 error_ret_free_internal:
3767 if (elf_section_data (section)->relocs == NULL)
3768 free (internal_relocs);
3769 goto error_ret_free_local;
3773 if (! avr_stub_is_required_for_16_bit_reloc
3774 (destination - htab->vector_base))
3776 if (!is_prealloc_run)
3777 /* We are having a reloc that does't need a stub. */
3780 /* We don't right now know if a stub will be needed.
3781 Let's rather be on the safe side. */
3784 /* Get the name of this stub. */
3785 stub_name = avr_stub_name (sym_sec, sym_value, irela);
3788 goto error_ret_free_internal;
3791 hsh = avr_stub_hash_lookup (&htab->bstab,
3796 /* The proper stub has already been created. Mark it
3797 to be used and write the possibly changed destination
3799 hsh->is_actually_needed = TRUE;
3800 hsh->target_value = destination;
3805 hsh = avr_add_stub (stub_name, htab);
3809 goto error_ret_free_internal;
3812 hsh->is_actually_needed = TRUE;
3813 hsh->target_value = destination;
3816 printf ("Adding stub with destination 0x%x to the"
3817 " hash table.\n", (unsigned int) destination);
3819 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
3821 stub_changed = TRUE;
3824 /* We're done with the internal relocs, free them. */
3825 if (elf_section_data (section)->relocs == NULL)
3826 free (internal_relocs);
3830 /* Re-Calculate the number of needed stubs. */
3831 htab->stub_sec->size = 0;
3832 bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
3837 stub_changed = FALSE;
3840 free (htab->all_local_syms);
3843 error_ret_free_local:
3844 free (htab->all_local_syms);
3849 /* Build all the stubs associated with the current output file. The
3850 stubs are kept in a hash table attached to the main linker hash
3851 table. We also set up the .plt entries for statically linked PIC
3852 functions here. This function is called via hppaelf_finish in the
3856 elf32_avr_build_stubs (struct bfd_link_info *info)
3859 struct bfd_hash_table *table;
3860 struct elf32_avr_link_hash_table *htab;
3861 bfd_size_type total_size = 0;
3863 htab = avr_link_hash_table (info);
3867 /* In case that there were several stub sections: */
3868 for (stub_sec = htab->stub_bfd->sections;
3870 stub_sec = stub_sec->next)
3874 /* Allocate memory to hold the linker stubs. */
3875 size = stub_sec->size;
3878 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3879 if (stub_sec->contents == NULL && size != 0)
3884 /* Allocate memory for the adress mapping table. */
3885 htab->amt_entry_cnt = 0;
3886 htab->amt_max_entry_cnt = total_size / 4;
3887 htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
3888 * htab->amt_max_entry_cnt);
3889 htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
3890 * htab->amt_max_entry_cnt );
3893 printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
3895 /* Build the stubs as directed by the stub hash table. */
3896 table = &htab->bstab;
3897 bfd_hash_traverse (table, avr_build_one_stub, info);
3900 printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
3905 /* Callback used by QSORT to order relocations AP and BP. */
3908 internal_reloc_compare (const void *ap, const void *bp)
3910 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
3911 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
3913 if (a->r_offset != b->r_offset)
3914 return (a->r_offset - b->r_offset);
3916 /* We don't need to sort on these criteria for correctness,
3917 but enforcing a more strict ordering prevents unstable qsort
3918 from behaving differently with different implementations.
3919 Without the code below we get correct but different results
3920 on Solaris 2.7 and 2.8. We would like to always produce the
3921 same results no matter the host. */
3923 if (a->r_info != b->r_info)
3924 return (a->r_info - b->r_info);
3926 return (a->r_addend - b->r_addend);
3929 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3932 avr_is_section_for_address (bfd *abfd, asection *section, bfd_vma address)
3937 vma = bfd_get_section_vma (abfd, section);
3941 size = section->size;
3942 if (address >= vma + size)
3948 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3950 struct avr_find_section_data
3952 /* The address we're looking for. */
3955 /* The section we've found. */
3959 /* Helper function to locate the section holding a certain virtual memory
3960 address. This is called via bfd_map_over_sections. The DATA is an
3961 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3962 has been set to the address to search for, and the section field has
3963 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3964 section field in DATA will be set to SECTION. As an optimisation, if
3965 the section field is already non-null then this function does not
3966 perform any checks, and just returns. */
3969 avr_find_section_for_address (bfd *abfd,
3970 asection *section, void *data)
3972 struct avr_find_section_data *fs_data
3973 = (struct avr_find_section_data *) data;
3975 /* Return if already found. */
3976 if (fs_data->section != NULL)
3979 /* If this section isn't part of the addressable code content, skip it. */
3980 if ((bfd_get_section_flags (abfd, section) & SEC_ALLOC) == 0
3981 && (bfd_get_section_flags (abfd, section) & SEC_CODE) == 0)
3984 if (avr_is_section_for_address (abfd, section, fs_data->address))
3985 fs_data->section = section;
3988 /* Load all of the property records from SEC, a section from ABFD. Return
3989 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
3990 memory for the returned structure, and all of the records pointed too by
3991 the structure are allocated with a single call to malloc, so, only the
3992 pointer returned needs to be free'd. */
3994 static struct avr_property_record_list *
3995 avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
3997 char *contents = NULL, *ptr;
3998 bfd_size_type size, mem_size;
3999 bfd_byte version, flags;
4000 uint16_t record_count, i;
4001 struct avr_property_record_list *r_list = NULL;
4002 Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
4003 struct avr_find_section_data fs_data;
4005 fs_data.section = NULL;
4007 size = bfd_get_section_size (sec);
4008 contents = bfd_malloc (size);
4009 bfd_get_section_contents (abfd, sec, contents, 0, size);
4012 /* Load the relocations for the '.avr.prop' section if there are any, and
4014 internal_relocs = (_bfd_elf_link_read_relocs
4015 (abfd, sec, NULL, NULL, FALSE));
4016 if (internal_relocs)
4017 qsort (internal_relocs, sec->reloc_count,
4018 sizeof (Elf_Internal_Rela), internal_reloc_compare);
4020 /* There is a header at the start of the property record section SEC, the
4021 format of this header is:
4022 uint8_t : version number
4024 uint16_t : record counter
4027 /* Check we have at least got a headers worth of bytes. */
4028 if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
4031 version = *((bfd_byte *) ptr);
4033 flags = *((bfd_byte *) ptr);
4035 record_count = *((uint16_t *) ptr);
4037 BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
4039 /* Now allocate space for the list structure, and all of the list
4040 elements in a single block. */
4041 mem_size = sizeof (struct avr_property_record_list)
4042 + sizeof (struct avr_property_record) * record_count;
4043 r_list = bfd_malloc (mem_size);
4047 r_list->version = version;
4048 r_list->flags = flags;
4049 r_list->section = sec;
4050 r_list->record_count = record_count;
4051 r_list->records = (struct avr_property_record *) (&r_list [1]);
4052 size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
4054 /* Check that we understand the version number. There is only one
4055 version number right now, anything else is an error. */
4056 if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
4059 rel = internal_relocs;
4060 rel_end = rel + sec->reloc_count;
4061 for (i = 0; i < record_count; ++i)
4065 /* Each entry is a 32-bit address, followed by a single byte type.
4066 After that is the type specific data. We must take care to
4067 ensure that we don't read beyond the end of the section data. */
4071 r_list->records [i].section = NULL;
4072 r_list->records [i].offset = 0;
4076 /* The offset of the address within the .avr.prop section. */
4077 size_t offset = ptr - contents;
4079 while (rel < rel_end && rel->r_offset < offset)
4084 else if (rel->r_offset == offset)
4086 /* Find section and section offset. */
4087 unsigned long r_symndx;
4092 r_symndx = ELF32_R_SYM (rel->r_info);
4093 rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
4094 sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
4097 r_list->records [i].section = rel_sec;
4098 r_list->records [i].offset = sec_offset;
4102 address = *((uint32_t *) ptr);
4106 if (r_list->records [i].section == NULL)
4108 /* Try to find section and offset from address. */
4109 if (fs_data.section != NULL
4110 && !avr_is_section_for_address (abfd, fs_data.section,
4112 fs_data.section = NULL;
4114 if (fs_data.section == NULL)
4116 fs_data.address = address;
4117 bfd_map_over_sections (abfd, avr_find_section_for_address,
4121 if (fs_data.section == NULL)
4123 fprintf (stderr, "Failed to find matching section.\n");
4127 r_list->records [i].section = fs_data.section;
4128 r_list->records [i].offset
4129 = address - bfd_get_section_vma (abfd, fs_data.section);
4132 r_list->records [i].type = *((bfd_byte *) ptr);
4136 switch (r_list->records [i].type)
4139 /* Nothing else to load. */
4141 case RECORD_ORG_AND_FILL:
4142 /* Just a 4-byte fill to load. */
4145 r_list->records [i].data.org.fill = *((uint32_t *) ptr);
4150 /* Just a 4-byte alignment to load. */
4153 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4156 /* Just initialise PRECEDING_DELETED field, this field is
4157 used during linker relaxation. */
4158 r_list->records [i].data.align.preceding_deleted = 0;
4160 case RECORD_ALIGN_AND_FILL:
4161 /* A 4-byte alignment, and a 4-byte fill to load. */
4164 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4166 r_list->records [i].data.align.fill = *((uint32_t *) ptr);
4169 /* Just initialise PRECEDING_DELETED field, this field is
4170 used during linker relaxation. */
4171 r_list->records [i].data.align.preceding_deleted = 0;
4179 if (elf_section_data (sec)->relocs != internal_relocs)
4180 free (internal_relocs);
4184 if (elf_section_data (sec)->relocs != internal_relocs)
4185 free (internal_relocs);
4191 /* Load all of the property records from ABFD. See
4192 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4194 struct avr_property_record_list *
4195 avr_elf32_load_property_records (bfd *abfd)
4199 /* Find the '.avr.prop' section and load the contents into memory. */
4200 sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
4203 return avr_elf32_load_records_from_section (abfd, sec);
4207 avr_elf32_property_record_name (struct avr_property_record *rec)
4216 case RECORD_ORG_AND_FILL:
4222 case RECORD_ALIGN_AND_FILL:
4233 #define ELF_ARCH bfd_arch_avr
4234 #define ELF_TARGET_ID AVR_ELF_DATA
4235 #define ELF_MACHINE_CODE EM_AVR
4236 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4237 #define ELF_MAXPAGESIZE 1
4239 #define TARGET_LITTLE_SYM avr_elf32_vec
4240 #define TARGET_LITTLE_NAME "elf32-avr"
4242 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4244 #define elf_info_to_howto avr_info_to_howto_rela
4245 #define elf_info_to_howto_rel NULL
4246 #define elf_backend_relocate_section elf32_avr_relocate_section
4247 #define elf_backend_can_gc_sections 1
4248 #define elf_backend_rela_normal 1
4249 #define elf_backend_final_write_processing \
4250 bfd_elf_avr_final_write_processing
4251 #define elf_backend_object_p elf32_avr_object_p
4253 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4254 #define bfd_elf32_bfd_get_relocated_section_contents \
4255 elf32_avr_get_relocated_section_contents
4256 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4258 #include "elf32-target.h"