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"),
961 bfd_set_error (bfd_error_bad_value);
964 cache_ptr->howto = &elf_avr_howto_table[r_type];
969 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
971 return (relocation >= 0x020000);
974 /* Returns the address of the corresponding stub if there is one.
975 Returns otherwise an address above 0x020000. This function
976 could also be used, if there is no knowledge on the section where
977 the destination is found. */
980 avr_get_stub_addr (bfd_vma srel,
981 struct elf32_avr_link_hash_table *htab)
984 bfd_vma stub_sec_addr =
985 (htab->stub_sec->output_section->vma +
986 htab->stub_sec->output_offset);
988 for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
989 if (htab->amt_destination_addr[sindex] == srel)
990 return htab->amt_stub_offsets[sindex] + stub_sec_addr;
992 /* Return an address that could not be reached by 16 bit relocs. */
996 /* Perform a diff relocation. Nothing to do, as the difference value is already
997 written into the section's contents. */
999 static bfd_reloc_status_type
1000 bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
1001 arelent *reloc_entry ATTRIBUTE_UNUSED,
1002 asymbol *symbol ATTRIBUTE_UNUSED,
1003 void *data ATTRIBUTE_UNUSED,
1004 asection *input_section ATTRIBUTE_UNUSED,
1005 bfd *output_bfd ATTRIBUTE_UNUSED,
1006 char **error_message ATTRIBUTE_UNUSED)
1008 return bfd_reloc_ok;
1012 /* Perform a single relocation. By default we use the standard BFD
1013 routines, but a few relocs, we have to do them ourselves. */
1015 static bfd_reloc_status_type
1016 avr_final_link_relocate (reloc_howto_type * howto,
1018 asection * input_section,
1019 bfd_byte * contents,
1020 Elf_Internal_Rela * rel,
1022 struct elf32_avr_link_hash_table * htab)
1024 bfd_reloc_status_type r = bfd_reloc_ok;
1026 bfd_signed_vma srel;
1027 bfd_signed_vma reloc_addr;
1028 bfd_boolean use_stubs = FALSE;
1029 /* Usually is 0, unless we are generating code for a bootloader. */
1030 bfd_signed_vma base_addr = htab->vector_base;
1032 /* Absolute addr of the reloc in the final excecutable. */
1033 reloc_addr = rel->r_offset + input_section->output_section->vma
1034 + input_section->output_offset;
1036 switch (howto->type)
1039 contents += rel->r_offset;
1040 srel = (bfd_signed_vma) relocation;
1041 srel += rel->r_addend;
1042 srel -= rel->r_offset;
1043 srel -= 2; /* Branch instructions add 2 to the PC... */
1044 srel -= (input_section->output_section->vma +
1045 input_section->output_offset);
1048 return bfd_reloc_outofrange;
1049 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
1050 return bfd_reloc_overflow;
1051 x = bfd_get_16 (input_bfd, contents);
1052 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
1053 bfd_put_16 (input_bfd, x, contents);
1056 case R_AVR_13_PCREL:
1057 contents += rel->r_offset;
1058 srel = (bfd_signed_vma) relocation;
1059 srel += rel->r_addend;
1060 srel -= rel->r_offset;
1061 srel -= 2; /* Branch instructions add 2 to the PC... */
1062 srel -= (input_section->output_section->vma +
1063 input_section->output_offset);
1066 return bfd_reloc_outofrange;
1068 srel = avr_relative_distance_considering_wrap_around (srel);
1070 /* AVR addresses commands as words. */
1073 /* Check for overflow. */
1074 if (srel < -2048 || srel > 2047)
1076 /* Relative distance is too large. */
1078 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1079 switch (bfd_get_mach (input_bfd))
1082 case bfd_mach_avr25:
1087 return bfd_reloc_overflow;
1091 x = bfd_get_16 (input_bfd, contents);
1092 x = (x & 0xf000) | (srel & 0xfff);
1093 bfd_put_16 (input_bfd, x, contents);
1097 contents += rel->r_offset;
1098 srel = (bfd_signed_vma) relocation + rel->r_addend;
1099 x = bfd_get_16 (input_bfd, contents);
1100 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1101 bfd_put_16 (input_bfd, x, contents);
1105 contents += rel->r_offset;
1106 srel = (bfd_signed_vma) relocation + rel->r_addend;
1107 if (((srel > 0) && (srel & 0xffff) > 255)
1108 || ((srel < 0) && ((-srel) & 0xffff) > 128))
1109 /* Remove offset for data/eeprom section. */
1110 return bfd_reloc_overflow;
1112 x = bfd_get_16 (input_bfd, contents);
1113 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1114 bfd_put_16 (input_bfd, x, contents);
1118 contents += rel->r_offset;
1119 srel = (bfd_signed_vma) relocation + rel->r_addend;
1120 if (((srel & 0xffff) > 63) || (srel < 0))
1121 /* Remove offset for data/eeprom section. */
1122 return bfd_reloc_overflow;
1123 x = bfd_get_16 (input_bfd, contents);
1124 x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
1125 | ((srel & (1 << 5)) << 8));
1126 bfd_put_16 (input_bfd, x, contents);
1130 contents += rel->r_offset;
1131 srel = (bfd_signed_vma) relocation + rel->r_addend;
1132 if (((srel & 0xffff) > 63) || (srel < 0))
1133 /* Remove offset for data/eeprom section. */
1134 return bfd_reloc_overflow;
1135 x = bfd_get_16 (input_bfd, contents);
1136 x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
1137 bfd_put_16 (input_bfd, x, contents);
1141 contents += rel->r_offset;
1142 srel = (bfd_signed_vma) relocation + rel->r_addend;
1143 srel = (srel >> 8) & 0xff;
1144 x = bfd_get_16 (input_bfd, contents);
1145 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1146 bfd_put_16 (input_bfd, x, contents);
1150 contents += rel->r_offset;
1151 srel = (bfd_signed_vma) relocation + rel->r_addend;
1152 srel = (srel >> 16) & 0xff;
1153 x = bfd_get_16 (input_bfd, contents);
1154 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1155 bfd_put_16 (input_bfd, x, contents);
1159 contents += rel->r_offset;
1160 srel = (bfd_signed_vma) relocation + rel->r_addend;
1161 srel = (srel >> 24) & 0xff;
1162 x = bfd_get_16 (input_bfd, contents);
1163 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1164 bfd_put_16 (input_bfd, x, contents);
1167 case R_AVR_LO8_LDI_NEG:
1168 contents += rel->r_offset;
1169 srel = (bfd_signed_vma) relocation + rel->r_addend;
1171 x = bfd_get_16 (input_bfd, contents);
1172 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1173 bfd_put_16 (input_bfd, x, contents);
1176 case R_AVR_HI8_LDI_NEG:
1177 contents += rel->r_offset;
1178 srel = (bfd_signed_vma) relocation + rel->r_addend;
1180 srel = (srel >> 8) & 0xff;
1181 x = bfd_get_16 (input_bfd, contents);
1182 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1183 bfd_put_16 (input_bfd, x, contents);
1186 case R_AVR_HH8_LDI_NEG:
1187 contents += rel->r_offset;
1188 srel = (bfd_signed_vma) relocation + rel->r_addend;
1190 srel = (srel >> 16) & 0xff;
1191 x = bfd_get_16 (input_bfd, contents);
1192 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1193 bfd_put_16 (input_bfd, x, contents);
1196 case R_AVR_MS8_LDI_NEG:
1197 contents += rel->r_offset;
1198 srel = (bfd_signed_vma) relocation + rel->r_addend;
1200 srel = (srel >> 24) & 0xff;
1201 x = bfd_get_16 (input_bfd, contents);
1202 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1203 bfd_put_16 (input_bfd, x, contents);
1206 case R_AVR_LO8_LDI_GS:
1207 use_stubs = (!htab->no_stubs);
1209 case R_AVR_LO8_LDI_PM:
1210 contents += rel->r_offset;
1211 srel = (bfd_signed_vma) relocation + rel->r_addend;
1214 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1216 bfd_vma old_srel = srel;
1218 /* We need to use the address of the stub instead. */
1219 srel = avr_get_stub_addr (srel, htab);
1221 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1222 "reloc at address 0x%x.\n",
1223 (unsigned int) srel,
1224 (unsigned int) old_srel,
1225 (unsigned int) reloc_addr);
1227 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1228 return bfd_reloc_outofrange;
1232 return bfd_reloc_outofrange;
1234 x = bfd_get_16 (input_bfd, contents);
1235 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1236 bfd_put_16 (input_bfd, x, contents);
1239 case R_AVR_HI8_LDI_GS:
1240 use_stubs = (!htab->no_stubs);
1242 case R_AVR_HI8_LDI_PM:
1243 contents += rel->r_offset;
1244 srel = (bfd_signed_vma) relocation + rel->r_addend;
1247 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1249 bfd_vma old_srel = srel;
1251 /* We need to use the address of the stub instead. */
1252 srel = avr_get_stub_addr (srel, htab);
1254 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1255 "reloc at address 0x%x.\n",
1256 (unsigned int) srel,
1257 (unsigned int) old_srel,
1258 (unsigned int) reloc_addr);
1260 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1261 return bfd_reloc_outofrange;
1265 return bfd_reloc_outofrange;
1267 srel = (srel >> 8) & 0xff;
1268 x = bfd_get_16 (input_bfd, contents);
1269 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1270 bfd_put_16 (input_bfd, x, contents);
1273 case R_AVR_HH8_LDI_PM:
1274 contents += rel->r_offset;
1275 srel = (bfd_signed_vma) relocation + rel->r_addend;
1277 return bfd_reloc_outofrange;
1279 srel = (srel >> 16) & 0xff;
1280 x = bfd_get_16 (input_bfd, contents);
1281 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1282 bfd_put_16 (input_bfd, x, contents);
1285 case R_AVR_LO8_LDI_PM_NEG:
1286 contents += rel->r_offset;
1287 srel = (bfd_signed_vma) relocation + rel->r_addend;
1290 return bfd_reloc_outofrange;
1292 x = bfd_get_16 (input_bfd, contents);
1293 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1294 bfd_put_16 (input_bfd, x, contents);
1297 case R_AVR_HI8_LDI_PM_NEG:
1298 contents += rel->r_offset;
1299 srel = (bfd_signed_vma) relocation + rel->r_addend;
1302 return bfd_reloc_outofrange;
1304 srel = (srel >> 8) & 0xff;
1305 x = bfd_get_16 (input_bfd, contents);
1306 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1307 bfd_put_16 (input_bfd, x, contents);
1310 case R_AVR_HH8_LDI_PM_NEG:
1311 contents += rel->r_offset;
1312 srel = (bfd_signed_vma) relocation + rel->r_addend;
1315 return bfd_reloc_outofrange;
1317 srel = (srel >> 16) & 0xff;
1318 x = bfd_get_16 (input_bfd, contents);
1319 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1320 bfd_put_16 (input_bfd, x, contents);
1324 contents += rel->r_offset;
1325 srel = (bfd_signed_vma) relocation + rel->r_addend;
1327 return bfd_reloc_outofrange;
1329 x = bfd_get_16 (input_bfd, contents);
1330 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
1331 bfd_put_16 (input_bfd, x, contents);
1332 bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
1336 use_stubs = (!htab->no_stubs);
1337 contents += rel->r_offset;
1338 srel = (bfd_signed_vma) relocation + rel->r_addend;
1341 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1343 bfd_vma old_srel = srel;
1345 /* We need to use the address of the stub instead. */
1346 srel = avr_get_stub_addr (srel,htab);
1348 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1349 "reloc at address 0x%x.\n",
1350 (unsigned int) srel,
1351 (unsigned int) old_srel,
1352 (unsigned int) reloc_addr);
1354 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1355 return bfd_reloc_outofrange;
1359 return bfd_reloc_outofrange;
1361 bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
1367 /* Nothing to do here, as contents already contains the diff value. */
1371 case R_AVR_LDS_STS_16:
1372 contents += rel->r_offset;
1373 srel = (bfd_signed_vma) relocation + rel->r_addend;
1374 if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
1375 return bfd_reloc_outofrange;
1377 x = bfd_get_16 (input_bfd, contents);
1378 x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
1379 bfd_put_16 (input_bfd, x, contents);
1383 contents += rel->r_offset;
1384 srel = (bfd_signed_vma) relocation + rel->r_addend;
1385 if ((srel & 0xffff) > 0x3f)
1386 return bfd_reloc_outofrange;
1387 x = bfd_get_16 (input_bfd, contents);
1388 x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
1389 bfd_put_16 (input_bfd, x, contents);
1393 contents += rel->r_offset;
1394 srel = (bfd_signed_vma) relocation + rel->r_addend;
1395 if ((srel & 0xffff) > 0x1f)
1396 return bfd_reloc_outofrange;
1397 x = bfd_get_16 (input_bfd, contents);
1398 x = (x & 0xff07) | ((srel & 0x1f) << 3);
1399 bfd_put_16 (input_bfd, x, contents);
1403 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1404 contents, rel->r_offset,
1405 relocation, rel->r_addend);
1411 /* Relocate an AVR ELF section. */
1414 elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1415 struct bfd_link_info *info,
1417 asection *input_section,
1419 Elf_Internal_Rela *relocs,
1420 Elf_Internal_Sym *local_syms,
1421 asection **local_sections)
1423 Elf_Internal_Shdr * symtab_hdr;
1424 struct elf_link_hash_entry ** sym_hashes;
1425 Elf_Internal_Rela * rel;
1426 Elf_Internal_Rela * relend;
1427 struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
1432 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1433 sym_hashes = elf_sym_hashes (input_bfd);
1434 relend = relocs + input_section->reloc_count;
1436 for (rel = relocs; rel < relend; rel ++)
1438 reloc_howto_type * howto;
1439 unsigned long r_symndx;
1440 Elf_Internal_Sym * sym;
1442 struct elf_link_hash_entry * h;
1444 bfd_reloc_status_type r;
1448 r_type = ELF32_R_TYPE (rel->r_info);
1449 r_symndx = ELF32_R_SYM (rel->r_info);
1450 howto = elf_avr_howto_table + r_type;
1455 if (r_symndx < symtab_hdr->sh_info)
1457 sym = local_syms + r_symndx;
1458 sec = local_sections [r_symndx];
1459 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1461 name = bfd_elf_string_from_elf_section
1462 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1463 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
1467 bfd_boolean unresolved_reloc, warned, ignored;
1469 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1470 r_symndx, symtab_hdr, sym_hashes,
1472 unresolved_reloc, warned, ignored);
1474 name = h->root.root.string;
1477 if (sec != NULL && discarded_section (sec))
1478 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1479 rel, 1, relend, howto, 0, contents);
1481 if (bfd_link_relocatable (info))
1484 r = avr_final_link_relocate (howto, input_bfd, input_section,
1485 contents, rel, relocation, htab);
1487 if (r != bfd_reloc_ok)
1489 const char * msg = (const char *) NULL;
1493 case bfd_reloc_overflow:
1494 (*info->callbacks->reloc_overflow)
1495 (info, (h ? &h->root : NULL), name, howto->name,
1496 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1499 case bfd_reloc_undefined:
1500 (*info->callbacks->undefined_symbol)
1501 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1504 case bfd_reloc_outofrange:
1505 msg = _("internal error: out of range error");
1508 case bfd_reloc_notsupported:
1509 msg = _("internal error: unsupported relocation error");
1512 case bfd_reloc_dangerous:
1513 msg = _("internal error: dangerous relocation");
1517 msg = _("internal error: unknown error");
1522 (*info->callbacks->warning) (info, msg, name, input_bfd,
1523 input_section, rel->r_offset);
1530 /* The final processing done just before writing out a AVR ELF object
1531 file. This gets the AVR architecture right based on the machine
1535 bfd_elf_avr_final_write_processing (bfd *abfd,
1536 bfd_boolean linker ATTRIBUTE_UNUSED)
1540 switch (bfd_get_mach (abfd))
1544 val = E_AVR_MACH_AVR2;
1548 val = E_AVR_MACH_AVR1;
1551 case bfd_mach_avr25:
1552 val = E_AVR_MACH_AVR25;
1556 val = E_AVR_MACH_AVR3;
1559 case bfd_mach_avr31:
1560 val = E_AVR_MACH_AVR31;
1563 case bfd_mach_avr35:
1564 val = E_AVR_MACH_AVR35;
1568 val = E_AVR_MACH_AVR4;
1572 val = E_AVR_MACH_AVR5;
1575 case bfd_mach_avr51:
1576 val = E_AVR_MACH_AVR51;
1580 val = E_AVR_MACH_AVR6;
1583 case bfd_mach_avrxmega1:
1584 val = E_AVR_MACH_XMEGA1;
1587 case bfd_mach_avrxmega2:
1588 val = E_AVR_MACH_XMEGA2;
1591 case bfd_mach_avrxmega3:
1592 val = E_AVR_MACH_XMEGA3;
1595 case bfd_mach_avrxmega4:
1596 val = E_AVR_MACH_XMEGA4;
1599 case bfd_mach_avrxmega5:
1600 val = E_AVR_MACH_XMEGA5;
1603 case bfd_mach_avrxmega6:
1604 val = E_AVR_MACH_XMEGA6;
1607 case bfd_mach_avrxmega7:
1608 val = E_AVR_MACH_XMEGA7;
1611 case bfd_mach_avrtiny:
1612 val = E_AVR_MACH_AVRTINY;
1616 elf_elfheader (abfd)->e_machine = EM_AVR;
1617 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
1618 elf_elfheader (abfd)->e_flags |= val;
1621 /* Set the right machine number. */
1624 elf32_avr_object_p (bfd *abfd)
1626 unsigned int e_set = bfd_mach_avr2;
1628 if (elf_elfheader (abfd)->e_machine == EM_AVR
1629 || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
1631 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
1636 case E_AVR_MACH_AVR2:
1637 e_set = bfd_mach_avr2;
1640 case E_AVR_MACH_AVR1:
1641 e_set = bfd_mach_avr1;
1644 case E_AVR_MACH_AVR25:
1645 e_set = bfd_mach_avr25;
1648 case E_AVR_MACH_AVR3:
1649 e_set = bfd_mach_avr3;
1652 case E_AVR_MACH_AVR31:
1653 e_set = bfd_mach_avr31;
1656 case E_AVR_MACH_AVR35:
1657 e_set = bfd_mach_avr35;
1660 case E_AVR_MACH_AVR4:
1661 e_set = bfd_mach_avr4;
1664 case E_AVR_MACH_AVR5:
1665 e_set = bfd_mach_avr5;
1668 case E_AVR_MACH_AVR51:
1669 e_set = bfd_mach_avr51;
1672 case E_AVR_MACH_AVR6:
1673 e_set = bfd_mach_avr6;
1676 case E_AVR_MACH_XMEGA1:
1677 e_set = bfd_mach_avrxmega1;
1680 case E_AVR_MACH_XMEGA2:
1681 e_set = bfd_mach_avrxmega2;
1684 case E_AVR_MACH_XMEGA3:
1685 e_set = bfd_mach_avrxmega3;
1688 case E_AVR_MACH_XMEGA4:
1689 e_set = bfd_mach_avrxmega4;
1692 case E_AVR_MACH_XMEGA5:
1693 e_set = bfd_mach_avrxmega5;
1696 case E_AVR_MACH_XMEGA6:
1697 e_set = bfd_mach_avrxmega6;
1700 case E_AVR_MACH_XMEGA7:
1701 e_set = bfd_mach_avrxmega7;
1704 case E_AVR_MACH_AVRTINY:
1705 e_set = bfd_mach_avrtiny;
1709 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
1713 /* Returns whether the relocation type passed is a diff reloc. */
1716 elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
1718 return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
1719 ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
1720 || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
1723 /* Reduce the diff value written in the section by count if the shrinked
1724 insn address happens to fall between the two symbols for which this
1725 diff reloc was emitted. */
1728 elf32_avr_adjust_diff_reloc_value (bfd *abfd,
1729 struct bfd_section *isec,
1730 Elf_Internal_Rela *irel,
1732 bfd_vma shrinked_insn_address,
1735 unsigned char *reloc_contents = NULL;
1736 unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
1737 if (isec_contents == NULL)
1739 if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
1742 elf_section_data (isec)->this_hdr.contents = isec_contents;
1745 reloc_contents = isec_contents + irel->r_offset;
1747 /* Read value written in object file. */
1748 bfd_signed_vma x = 0;
1749 switch (ELF32_R_TYPE (irel->r_info))
1753 x = bfd_get_signed_8 (abfd, reloc_contents);
1758 x = bfd_get_signed_16 (abfd, reloc_contents);
1763 x = bfd_get_signed_32 (abfd, reloc_contents);
1772 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1773 into the object file at the reloc offset. sym2's logical value is
1774 symval (<start_of_section>) + reloc addend. Compute the start and end
1775 addresses and check if the shrinked insn falls between sym1 and sym2. */
1777 bfd_vma sym2_address = symval + irel->r_addend;
1778 bfd_vma sym1_address = sym2_address - x;
1780 /* Don't assume sym2 is bigger than sym1 - the difference
1781 could be negative. Compute start and end addresses, and
1782 use those to see if they span shrinked_insn_address. */
1784 bfd_vma start_address = sym1_address < sym2_address
1785 ? sym1_address : sym2_address;
1786 bfd_vma end_address = sym1_address > sym2_address
1787 ? sym1_address : sym2_address;
1790 if (shrinked_insn_address >= start_address
1791 && shrinked_insn_address < end_address)
1793 /* Reduce the diff value by count bytes and write it back into section
1795 bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
1797 if (sym2_address > shrinked_insn_address)
1798 irel->r_addend -= count;
1800 switch (ELF32_R_TYPE (irel->r_info))
1804 bfd_put_signed_8 (abfd, new_diff, reloc_contents);
1809 bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents);
1814 bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
1827 elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd,
1829 Elf_Internal_Rela *irel, bfd_vma symval,
1830 bfd_vma shrinked_insn_address,
1831 bfd_vma shrink_boundary,
1835 if (elf32_avr_is_diff_reloc (irel))
1837 elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
1839 shrinked_insn_address,
1844 bfd_vma reloc_value = symval + irel->r_addend;
1845 bfd_boolean addend_within_shrink_boundary =
1846 (reloc_value <= shrink_boundary);
1848 bfd_boolean reloc_spans_insn =
1849 (symval <= shrinked_insn_address
1850 && reloc_value > shrinked_insn_address
1851 && addend_within_shrink_boundary);
1853 if (! reloc_spans_insn)
1856 irel->r_addend -= count;
1859 printf ("Relocation's addend needed to be fixed \n");
1864 avr_should_move_sym (symvalue symval,
1867 bfd_boolean did_pad)
1869 bfd_boolean sym_within_boundary =
1870 did_pad ? symval < end : symval <= end;
1871 return (symval > start && sym_within_boundary);
1875 avr_should_reduce_sym_size (symvalue symval,
1879 bfd_boolean did_pad)
1881 bfd_boolean sym_end_within_boundary =
1882 did_pad ? symend < end : symend <= end;
1883 return (symval <= start && symend > start && sym_end_within_boundary);
1887 avr_should_increase_sym_size (symvalue symval,
1891 bfd_boolean did_pad)
1893 return avr_should_move_sym (symval, start, end, did_pad)
1894 && symend >= end && did_pad;
1897 /* Delete some bytes from a section while changing the size of an instruction.
1898 The parameter "addr" denotes the section-relative offset pointing just
1899 behind the shrinked instruction. "addr+count" point at the first
1900 byte just behind the original unshrinked instruction. If delete_shrinks_insn
1901 is FALSE, we are deleting redundant padding bytes from relax_info prop
1902 record handling. In that case, addr is section-relative offset of start
1903 of padding, and count is the number of padding bytes to delete. */
1906 elf32_avr_relax_delete_bytes (bfd *abfd,
1910 bfd_boolean delete_shrinks_insn)
1912 Elf_Internal_Shdr *symtab_hdr;
1913 unsigned int sec_shndx;
1915 Elf_Internal_Rela *irel, *irelend;
1916 Elf_Internal_Sym *isym;
1917 Elf_Internal_Sym *isymbuf = NULL;
1919 struct elf_link_hash_entry **sym_hashes;
1920 struct elf_link_hash_entry **end_hashes;
1921 unsigned int symcount;
1922 struct avr_relax_info *relax_info;
1923 struct avr_property_record *prop_record = NULL;
1924 bfd_boolean did_shrink = FALSE;
1925 bfd_boolean did_pad = FALSE;
1927 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1928 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1929 contents = elf_section_data (sec)->this_hdr.contents;
1930 relax_info = get_avr_relax_info (sec);
1934 if (relax_info->records.count > 0)
1936 /* There should be no property record within the range of deleted
1937 bytes, however, there might be a property record for ADDR, this is
1938 how we handle alignment directives.
1939 Find the next (if any) property record after the deleted bytes. */
1942 for (i = 0; i < relax_info->records.count; ++i)
1944 bfd_vma offset = relax_info->records.items [i].offset;
1946 BFD_ASSERT (offset <= addr || offset >= (addr + count));
1947 if (offset >= (addr + count))
1949 prop_record = &relax_info->records.items [i];
1956 irel = elf_section_data (sec)->relocs;
1957 irelend = irel + sec->reloc_count;
1959 /* Actually delete the bytes. */
1960 if (toaddr - addr - count > 0)
1962 memmove (contents + addr, contents + addr + count,
1963 (size_t) (toaddr - addr - count));
1966 if (prop_record == NULL)
1973 /* Use the property record to fill in the bytes we've opened up. */
1975 switch (prop_record->type)
1977 case RECORD_ORG_AND_FILL:
1978 fill = prop_record->data.org.fill;
1982 case RECORD_ALIGN_AND_FILL:
1983 fill = prop_record->data.align.fill;
1986 prop_record->data.align.preceding_deleted += count;
1989 /* If toaddr == (addr + count), then we didn't delete anything, yet
1990 we fill count bytes backwards from toaddr. This is still ok - we
1991 end up overwriting the bytes we would have deleted. We just need
1992 to remember we didn't delete anything i.e. don't set did_shrink,
1993 so that we don't corrupt reloc offsets or symbol values.*/
1994 memset (contents + toaddr - count, fill, count);
2001 /* Adjust all the reloc addresses. */
2002 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
2004 bfd_vma old_reloc_address;
2006 old_reloc_address = (sec->output_section->vma
2007 + sec->output_offset + irel->r_offset);
2009 /* Get the new reloc address. */
2010 if ((irel->r_offset > addr
2011 && irel->r_offset < toaddr))
2014 printf ("Relocation at address 0x%x needs to be moved.\n"
2015 "Old section offset: 0x%x, New section offset: 0x%x \n",
2016 (unsigned int) old_reloc_address,
2017 (unsigned int) irel->r_offset,
2018 (unsigned int) ((irel->r_offset) - count));
2020 irel->r_offset -= count;
2025 /* The reloc's own addresses are now ok. However, we need to readjust
2026 the reloc's addend, i.e. the reloc's value if two conditions are met:
2027 1.) the reloc is relative to a symbol in this section that
2028 is located in front of the shrinked instruction
2029 2.) symbol plus addend end up behind the shrinked instruction.
2031 The most common case where this happens are relocs relative to
2032 the section-start symbol.
2034 This step needs to be done for all of the sections of the bfd. */
2037 struct bfd_section *isec;
2039 for (isec = abfd->sections; isec; isec = isec->next)
2042 bfd_vma shrinked_insn_address;
2044 if (isec->reloc_count == 0)
2047 shrinked_insn_address = (sec->output_section->vma
2048 + sec->output_offset + addr);
2049 if (delete_shrinks_insn)
2050 shrinked_insn_address -= count;
2052 irel = elf_section_data (isec)->relocs;
2053 /* PR 12161: Read in the relocs for this section if necessary. */
2055 irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2057 for (irelend = irel + isec->reloc_count;
2061 /* Read this BFD's local symbols if we haven't done
2063 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2065 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2066 if (isymbuf == NULL)
2067 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2068 symtab_hdr->sh_info, 0,
2070 if (isymbuf == NULL)
2074 /* Get the value of the symbol referred to by the reloc. */
2075 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2077 /* A local symbol. */
2080 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2081 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2082 symval = isym->st_value;
2083 /* If the reloc is absolute, it will not have
2084 a symbol or section associated with it. */
2087 /* If there is an alignment boundary, we only need to
2088 adjust addends that end up below the boundary. */
2089 bfd_vma shrink_boundary = (toaddr
2090 + sec->output_section->vma
2091 + sec->output_offset);
2093 symval += sym_sec->output_section->vma
2094 + sym_sec->output_offset;
2097 printf ("Checking if the relocation's "
2098 "addend needs corrections.\n"
2099 "Address of anchor symbol: 0x%x \n"
2100 "Address of relocation target: 0x%x \n"
2101 "Address of relaxed insn: 0x%x \n",
2102 (unsigned int) symval,
2103 (unsigned int) (symval + irel->r_addend),
2104 (unsigned int) shrinked_insn_address);
2106 elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel,
2108 shrinked_insn_address,
2112 /* else...Reference symbol is absolute. No adjustment needed. */
2114 /* else...Reference symbol is extern. No need for adjusting
2120 /* Adjust the local symbols defined in this section. */
2121 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2122 /* Fix PR 9841, there may be no local symbols. */
2125 Elf_Internal_Sym *isymend;
2127 isymend = isym + symtab_hdr->sh_info;
2128 for (; isym < isymend; isym++)
2130 if (isym->st_shndx == sec_shndx)
2132 symvalue symval = isym->st_value;
2133 symvalue symend = symval + isym->st_size;
2134 if (avr_should_reduce_sym_size (symval, symend,
2135 addr, toaddr, did_pad))
2137 /* If this assert fires then we have a symbol that ends
2138 part way through an instruction. Does that make
2140 BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
2141 isym->st_size -= count;
2143 else if (avr_should_increase_sym_size (symval, symend,
2144 addr, toaddr, did_pad))
2145 isym->st_size += count;
2147 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2148 isym->st_value -= count;
2153 /* Now adjust the global symbols defined in this section. */
2154 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2155 - symtab_hdr->sh_info);
2156 sym_hashes = elf_sym_hashes (abfd);
2157 end_hashes = sym_hashes + symcount;
2158 for (; sym_hashes < end_hashes; sym_hashes++)
2160 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2161 if ((sym_hash->root.type == bfd_link_hash_defined
2162 || sym_hash->root.type == bfd_link_hash_defweak)
2163 && sym_hash->root.u.def.section == sec)
2165 symvalue symval = sym_hash->root.u.def.value;
2166 symvalue symend = symval + sym_hash->size;
2168 if (avr_should_reduce_sym_size (symval, symend,
2169 addr, toaddr, did_pad))
2171 /* If this assert fires then we have a symbol that ends
2172 part way through an instruction. Does that make
2174 BFD_ASSERT (symend >= addr + count);
2175 sym_hash->size -= count;
2177 else if (avr_should_increase_sym_size (symval, symend,
2178 addr, toaddr, did_pad))
2179 sym_hash->size += count;
2181 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2182 sym_hash->root.u.def.value -= count;
2189 static Elf_Internal_Sym *
2190 retrieve_local_syms (bfd *input_bfd)
2192 Elf_Internal_Shdr *symtab_hdr;
2193 Elf_Internal_Sym *isymbuf;
2196 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2197 locsymcount = symtab_hdr->sh_info;
2199 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2200 if (isymbuf == NULL && locsymcount != 0)
2201 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
2204 /* Save the symbols for this input file so they won't be read again. */
2205 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
2206 symtab_hdr->contents = (unsigned char *) isymbuf;
2211 /* Get the input section for a given symbol index.
2213 . a section symbol, return the section;
2214 . a common symbol, return the common section;
2215 . an undefined symbol, return the undefined section;
2216 . an indirect symbol, follow the links;
2217 . an absolute value, return the absolute section. */
2220 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
2222 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2223 asection *target_sec = NULL;
2224 if (r_symndx < symtab_hdr->sh_info)
2226 Elf_Internal_Sym *isymbuf;
2227 unsigned int section_index;
2229 isymbuf = retrieve_local_syms (abfd);
2230 section_index = isymbuf[r_symndx].st_shndx;
2232 if (section_index == SHN_UNDEF)
2233 target_sec = bfd_und_section_ptr;
2234 else if (section_index == SHN_ABS)
2235 target_sec = bfd_abs_section_ptr;
2236 else if (section_index == SHN_COMMON)
2237 target_sec = bfd_com_section_ptr;
2239 target_sec = bfd_section_from_elf_index (abfd, section_index);
2243 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2244 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
2246 while (h->root.type == bfd_link_hash_indirect
2247 || h->root.type == bfd_link_hash_warning)
2248 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2250 switch (h->root.type)
2252 case bfd_link_hash_defined:
2253 case bfd_link_hash_defweak:
2254 target_sec = h->root.u.def.section;
2256 case bfd_link_hash_common:
2257 target_sec = bfd_com_section_ptr;
2259 case bfd_link_hash_undefined:
2260 case bfd_link_hash_undefweak:
2261 target_sec = bfd_und_section_ptr;
2263 default: /* New indirect warning. */
2264 target_sec = bfd_und_section_ptr;
2271 /* Get the section-relative offset for a symbol number. */
2274 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
2276 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2279 if (r_symndx < symtab_hdr->sh_info)
2281 Elf_Internal_Sym *isymbuf;
2282 isymbuf = retrieve_local_syms (abfd);
2283 offset = isymbuf[r_symndx].st_value;
2287 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2288 struct elf_link_hash_entry *h =
2289 elf_sym_hashes (abfd)[indx];
2291 while (h->root.type == bfd_link_hash_indirect
2292 || h->root.type == bfd_link_hash_warning)
2293 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2294 if (h->root.type == bfd_link_hash_defined
2295 || h->root.type == bfd_link_hash_defweak)
2296 offset = h->root.u.def.value;
2301 /* Iterate over the property records in R_LIST, and copy each record into
2302 the list of records within the relaxation information for the section to
2303 which the record applies. */
2306 avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
2310 for (i = 0; i < r_list->record_count; ++i)
2312 struct avr_relax_info *relax_info;
2314 relax_info = get_avr_relax_info (r_list->records [i].section);
2315 BFD_ASSERT (relax_info != NULL);
2317 if (relax_info->records.count
2318 == relax_info->records.allocated)
2320 /* Allocate more space. */
2323 relax_info->records.allocated += 10;
2324 size = (sizeof (struct avr_property_record)
2325 * relax_info->records.allocated);
2326 relax_info->records.items
2327 = bfd_realloc (relax_info->records.items, size);
2330 memcpy (&relax_info->records.items [relax_info->records.count],
2331 &r_list->records [i],
2332 sizeof (struct avr_property_record));
2333 relax_info->records.count++;
2337 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2338 ordering callback from QSORT. */
2341 avr_property_record_compare (const void *ap, const void *bp)
2343 const struct avr_property_record *a
2344 = (struct avr_property_record *) ap;
2345 const struct avr_property_record *b
2346 = (struct avr_property_record *) bp;
2348 if (a->offset != b->offset)
2349 return (a->offset - b->offset);
2351 if (a->section != b->section)
2352 return (bfd_get_section_vma (a->section->owner, a->section)
2353 - bfd_get_section_vma (b->section->owner, b->section));
2355 return (a->type - b->type);
2358 /* Load all of the avr property sections from all of the bfd objects
2359 referenced from LINK_INFO. All of the records within each property
2360 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2361 specific data of the appropriate section. */
2364 avr_load_all_property_sections (struct bfd_link_info *link_info)
2369 /* Initialize the per-section relaxation info. */
2370 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2371 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2373 init_avr_relax_info (sec);
2376 /* Load the descriptor tables from .avr.prop sections. */
2377 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2379 struct avr_property_record_list *r_list;
2381 r_list = avr_elf32_load_property_records (abfd);
2383 avr_elf32_assign_records_to_sections (r_list);
2388 /* Now, for every section, ensure that the descriptor list in the
2389 relaxation data is sorted by ascending offset within the section. */
2390 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2391 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2393 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
2394 if (relax_info && relax_info->records.count > 0)
2398 qsort (relax_info->records.items,
2399 relax_info->records.count,
2400 sizeof (struct avr_property_record),
2401 avr_property_record_compare);
2403 /* For debug purposes, list all the descriptors. */
2404 for (i = 0; i < relax_info->records.count; ++i)
2406 switch (relax_info->records.items [i].type)
2410 case RECORD_ORG_AND_FILL:
2414 case RECORD_ALIGN_AND_FILL:
2422 /* This function handles relaxing for the avr.
2423 Many important relaxing opportunities within functions are already
2424 realized by the compiler itself.
2425 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2426 and jump -> rjmp (safes also 2 bytes).
2427 As well we now optimize seqences of
2428 - call/rcall function
2433 . In case that within a sequence
2436 the ret could no longer be reached it is optimized away. In order
2437 to check if the ret is no longer needed, it is checked that the ret's address
2438 is not the target of a branch or jump within the same section, it is checked
2439 that there is no skip instruction before the jmp/rjmp and that there
2440 is no local or global label place at the address of the ret.
2442 We refrain from relaxing within sections ".vectors" and
2443 ".jumptables" in order to maintain the position of the instructions.
2444 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2445 if possible. (In future one could possibly use the space of the nop
2446 for the first instruction of the irq service function.
2448 The .jumptables sections is meant to be used for a future tablejump variant
2449 for the devices with 3-byte program counter where the table itself
2450 contains 4-byte jump instructions whose relative offset must not
2454 elf32_avr_relax_section (bfd *abfd,
2456 struct bfd_link_info *link_info,
2459 Elf_Internal_Shdr *symtab_hdr;
2460 Elf_Internal_Rela *internal_relocs;
2461 Elf_Internal_Rela *irel, *irelend;
2462 bfd_byte *contents = NULL;
2463 Elf_Internal_Sym *isymbuf = NULL;
2464 struct elf32_avr_link_hash_table *htab;
2465 static bfd_boolean relaxation_initialised = FALSE;
2467 if (!relaxation_initialised)
2469 relaxation_initialised = TRUE;
2471 /* Load entries from the .avr.prop sections. */
2472 avr_load_all_property_sections (link_info);
2475 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2476 relaxing. Such shrinking can cause issues for the sections such
2477 as .vectors and .jumptables. Instead the unused bytes should be
2478 filled with nop instructions. */
2479 bfd_boolean shrinkable = TRUE;
2481 if (!strcmp (sec->name,".vectors")
2482 || !strcmp (sec->name,".jumptables"))
2485 if (bfd_link_relocatable (link_info))
2486 (*link_info->callbacks->einfo)
2487 (_("%P%F: --relax and -r may not be used together\n"));
2489 htab = avr_link_hash_table (link_info);
2493 /* Assume nothing changes. */
2496 if ((!htab->no_stubs) && (sec == htab->stub_sec))
2498 /* We are just relaxing the stub section.
2499 Let's calculate the size needed again. */
2500 bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
2503 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2504 (int) last_estimated_stub_section_size);
2506 elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
2509 /* Check if the number of trampolines changed. */
2510 if (last_estimated_stub_section_size != htab->stub_sec->size)
2514 printf ("Size of stub section after this pass: %i\n",
2515 (int) htab->stub_sec->size);
2520 /* We don't have to do anything for a relocatable link, if
2521 this section does not have relocs, or if this is not a
2523 if (bfd_link_relocatable (link_info)
2524 || (sec->flags & SEC_RELOC) == 0
2525 || sec->reloc_count == 0
2526 || (sec->flags & SEC_CODE) == 0)
2529 /* Check if the object file to relax uses internal symbols so that we
2530 could fix up the relocations. */
2531 if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
2534 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2536 /* Get a copy of the native relocations. */
2537 internal_relocs = (_bfd_elf_link_read_relocs
2538 (abfd, sec, NULL, NULL, link_info->keep_memory));
2539 if (internal_relocs == NULL)
2542 /* Walk through the relocs looking for relaxing opportunities. */
2543 irelend = internal_relocs + sec->reloc_count;
2544 for (irel = internal_relocs; irel < irelend; irel++)
2548 if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
2549 && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
2550 && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
2553 /* Get the section contents if we haven't done so already. */
2554 if (contents == NULL)
2556 /* Get cached copy if it exists. */
2557 if (elf_section_data (sec)->this_hdr.contents != NULL)
2558 contents = elf_section_data (sec)->this_hdr.contents;
2561 /* Go get them off disk. */
2562 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2567 /* Read this BFD's local symbols if we haven't done so already. */
2568 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2570 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2571 if (isymbuf == NULL)
2572 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2573 symtab_hdr->sh_info, 0,
2575 if (isymbuf == NULL)
2580 /* Get the value of the symbol referred to by the reloc. */
2581 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2583 /* A local symbol. */
2584 Elf_Internal_Sym *isym;
2587 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2588 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2589 symval = isym->st_value;
2590 /* If the reloc is absolute, it will not have
2591 a symbol or section associated with it. */
2593 symval += sym_sec->output_section->vma
2594 + sym_sec->output_offset;
2599 struct elf_link_hash_entry *h;
2601 /* An external symbol. */
2602 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2603 h = elf_sym_hashes (abfd)[indx];
2604 BFD_ASSERT (h != NULL);
2605 if (h->root.type != bfd_link_hash_defined
2606 && h->root.type != bfd_link_hash_defweak)
2607 /* This appears to be a reference to an undefined
2608 symbol. Just ignore it--it will be caught by the
2609 regular reloc processing. */
2612 symval = (h->root.u.def.value
2613 + h->root.u.def.section->output_section->vma
2614 + h->root.u.def.section->output_offset);
2617 /* For simplicity of coding, we are going to modify the section
2618 contents, the section relocs, and the BFD symbol table. We
2619 must tell the rest of the code not to free up this
2620 information. It would be possible to instead create a table
2621 of changes which have to be made, as is done in coff-mips.c;
2622 that would be more work, but would require less memory when
2623 the linker is run. */
2624 switch (ELF32_R_TYPE (irel->r_info))
2626 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2627 pc-relative rcall/rjmp. */
2630 bfd_vma value = symval + irel->r_addend;
2632 int distance_short_enough = 0;
2634 /* Get the address of this instruction. */
2635 dot = (sec->output_section->vma
2636 + sec->output_offset + irel->r_offset);
2638 /* Compute the distance from this insn to the branch target. */
2641 /* Check if the gap falls in the range that can be accommodated
2642 in 13bits signed (It is 12bits when encoded, as we deal with
2643 word addressing). */
2644 if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095))
2645 distance_short_enough = 1;
2646 /* If shrinkable, then we can check for a range of distance which
2647 is two bytes farther on both the directions because the call
2648 or jump target will be closer by two bytes after the
2650 else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097))
2651 distance_short_enough = 1;
2653 /* Here we handle the wrap-around case. E.g. for a 16k device
2654 we could use a rjmp to jump from address 0x100 to 0x3d00!
2655 In order to make this work properly, we need to fill the
2656 vaiable avr_pc_wrap_around with the appropriate value.
2657 I.e. 0x4000 for a 16k device. */
2659 /* Shrinking the code size makes the gaps larger in the
2660 case of wrap-arounds. So we use a heuristical safety
2661 margin to avoid that during relax the distance gets
2662 again too large for the short jumps. Let's assume
2663 a typical code-size reduction due to relax for a
2664 16k device of 600 bytes. So let's use twice the
2665 typical value as safety margin. */
2669 int assumed_shrink = 600;
2670 if (avr_pc_wrap_around > 0x4000)
2671 assumed_shrink = 900;
2673 safety_margin = 2 * assumed_shrink;
2675 rgap = avr_relative_distance_considering_wrap_around (gap);
2677 if (rgap >= (-4092 + safety_margin)
2678 && rgap <= (4094 - safety_margin))
2679 distance_short_enough = 1;
2682 if (distance_short_enough)
2684 unsigned char code_msb;
2685 unsigned char code_lsb;
2688 printf ("shrinking jump/call instruction at address 0x%x"
2689 " in section %s\n\n",
2690 (int) dot, sec->name);
2692 /* Note that we've changed the relocs, section contents,
2694 elf_section_data (sec)->relocs = internal_relocs;
2695 elf_section_data (sec)->this_hdr.contents = contents;
2696 symtab_hdr->contents = (unsigned char *) isymbuf;
2698 /* Get the instruction code for relaxing. */
2699 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
2700 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2702 /* Mask out the relocation bits. */
2705 if (code_msb == 0x94 && code_lsb == 0x0E)
2707 /* we are changing call -> rcall . */
2708 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2709 bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
2711 else if (code_msb == 0x94 && code_lsb == 0x0C)
2713 /* we are changeing jump -> rjmp. */
2714 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2715 bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
2720 /* Fix the relocation's type. */
2721 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2724 /* We should not modify the ordering if 'shrinkable' is
2728 /* Let's insert a nop. */
2729 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
2730 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
2734 /* Delete two bytes of data. */
2735 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2736 irel->r_offset + 2, 2,
2740 /* That will change things, so, we should relax again.
2741 Note that this is not required, and it may be slow. */
2750 unsigned char code_msb;
2751 unsigned char code_lsb;
2754 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2755 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
2757 /* Get the address of this instruction. */
2758 dot = (sec->output_section->vma
2759 + sec->output_offset + irel->r_offset);
2761 /* Here we look for rcall/ret or call/ret sequences that could be
2762 safely replaced by rjmp/ret or jmp/ret. */
2763 if (((code_msb & 0xf0) == 0xd0)
2764 && avr_replace_call_ret_sequences)
2766 /* This insn is a rcall. */
2767 unsigned char next_insn_msb = 0;
2768 unsigned char next_insn_lsb = 0;
2770 if (irel->r_offset + 3 < sec->size)
2773 bfd_get_8 (abfd, contents + irel->r_offset + 3);
2775 bfd_get_8 (abfd, contents + irel->r_offset + 2);
2778 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2780 /* The next insn is a ret. We now convert the rcall insn
2781 into a rjmp instruction. */
2783 bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
2785 printf ("converted rcall/ret sequence at address 0x%x"
2786 " into rjmp/ret sequence. Section is %s\n\n",
2787 (int) dot, sec->name);
2792 else if ((0x94 == (code_msb & 0xfe))
2793 && (0x0e == (code_lsb & 0x0e))
2794 && avr_replace_call_ret_sequences)
2796 /* This insn is a call. */
2797 unsigned char next_insn_msb = 0;
2798 unsigned char next_insn_lsb = 0;
2800 if (irel->r_offset + 5 < sec->size)
2803 bfd_get_8 (abfd, contents + irel->r_offset + 5);
2805 bfd_get_8 (abfd, contents + irel->r_offset + 4);
2808 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2810 /* The next insn is a ret. We now convert the call insn
2811 into a jmp instruction. */
2814 bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
2816 printf ("converted call/ret sequence at address 0x%x"
2817 " into jmp/ret sequence. Section is %s\n\n",
2818 (int) dot, sec->name);
2823 else if ((0xc0 == (code_msb & 0xf0))
2824 || ((0x94 == (code_msb & 0xfe))
2825 && (0x0c == (code_lsb & 0x0e))))
2827 /* This insn is a rjmp or a jmp. */
2828 unsigned char next_insn_msb = 0;
2829 unsigned char next_insn_lsb = 0;
2832 if (0xc0 == (code_msb & 0xf0))
2833 insn_size = 2; /* rjmp insn */
2835 insn_size = 4; /* jmp insn */
2837 if (irel->r_offset + insn_size + 1 < sec->size)
2840 bfd_get_8 (abfd, contents + irel->r_offset
2843 bfd_get_8 (abfd, contents + irel->r_offset
2847 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2849 /* The next insn is a ret. We possibly could delete
2850 this ret. First we need to check for preceding
2851 sbis/sbic/sbrs or cpse "skip" instructions. */
2853 int there_is_preceding_non_skip_insn = 1;
2854 bfd_vma address_of_ret;
2856 address_of_ret = dot + insn_size;
2858 if (debug_relax && (insn_size == 2))
2859 printf ("found rjmp / ret sequence at address 0x%x\n",
2861 if (debug_relax && (insn_size == 4))
2862 printf ("found jmp / ret sequence at address 0x%x\n",
2865 /* We have to make sure that there is a preceding insn. */
2866 if (irel->r_offset >= 2)
2868 unsigned char preceding_msb;
2869 unsigned char preceding_lsb;
2872 bfd_get_8 (abfd, contents + irel->r_offset - 1);
2874 bfd_get_8 (abfd, contents + irel->r_offset - 2);
2877 if (0x99 == preceding_msb)
2878 there_is_preceding_non_skip_insn = 0;
2881 if (0x9b == preceding_msb)
2882 there_is_preceding_non_skip_insn = 0;
2885 if ((0xfc == (preceding_msb & 0xfe)
2886 && (0x00 == (preceding_lsb & 0x08))))
2887 there_is_preceding_non_skip_insn = 0;
2890 if ((0xfe == (preceding_msb & 0xfe)
2891 && (0x00 == (preceding_lsb & 0x08))))
2892 there_is_preceding_non_skip_insn = 0;
2895 if (0x10 == (preceding_msb & 0xfc))
2896 there_is_preceding_non_skip_insn = 0;
2898 if (there_is_preceding_non_skip_insn == 0)
2900 printf ("preceding skip insn prevents deletion of"
2901 " ret insn at Addy 0x%x in section %s\n",
2902 (int) dot + 2, sec->name);
2906 /* There is no previous instruction. */
2907 there_is_preceding_non_skip_insn = 0;
2910 if (there_is_preceding_non_skip_insn)
2912 /* We now only have to make sure that there is no
2913 local label defined at the address of the ret
2914 instruction and that there is no local relocation
2915 in this section pointing to the ret. */
2917 int deleting_ret_is_safe = 1;
2918 unsigned int section_offset_of_ret_insn =
2919 irel->r_offset + insn_size;
2920 Elf_Internal_Sym *isym, *isymend;
2921 unsigned int sec_shndx;
2922 struct bfd_section *isec;
2925 _bfd_elf_section_from_bfd_section (abfd, sec);
2927 /* Check for local symbols. */
2928 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2929 isymend = isym + symtab_hdr->sh_info;
2930 /* PR 6019: There may not be any local symbols. */
2931 for (; isym != NULL && isym < isymend; isym++)
2933 if (isym->st_value == section_offset_of_ret_insn
2934 && isym->st_shndx == sec_shndx)
2936 deleting_ret_is_safe = 0;
2938 printf ("local label prevents deletion of ret "
2939 "insn at address 0x%x\n",
2940 (int) dot + insn_size);
2944 /* Now check for global symbols. */
2947 struct elf_link_hash_entry **sym_hashes;
2948 struct elf_link_hash_entry **end_hashes;
2950 symcount = (symtab_hdr->sh_size
2951 / sizeof (Elf32_External_Sym)
2952 - symtab_hdr->sh_info);
2953 sym_hashes = elf_sym_hashes (abfd);
2954 end_hashes = sym_hashes + symcount;
2955 for (; sym_hashes < end_hashes; sym_hashes++)
2957 struct elf_link_hash_entry *sym_hash =
2959 if ((sym_hash->root.type == bfd_link_hash_defined
2960 || sym_hash->root.type ==
2961 bfd_link_hash_defweak)
2962 && sym_hash->root.u.def.section == sec
2963 && sym_hash->root.u.def.value == section_offset_of_ret_insn)
2965 deleting_ret_is_safe = 0;
2967 printf ("global label prevents deletion of "
2968 "ret insn at address 0x%x\n",
2969 (int) dot + insn_size);
2974 /* Now we check for relocations pointing to ret. */
2975 for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
2977 Elf_Internal_Rela *rel;
2978 Elf_Internal_Rela *relend;
2980 rel = elf_section_data (isec)->relocs;
2982 rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2984 relend = rel + isec->reloc_count;
2986 for (; rel && rel < relend; rel++)
2988 bfd_vma reloc_target = 0;
2990 /* Read this BFD's local symbols if we haven't
2992 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2994 isymbuf = (Elf_Internal_Sym *)
2995 symtab_hdr->contents;
2996 if (isymbuf == NULL)
2997 isymbuf = bfd_elf_get_elf_syms
3000 symtab_hdr->sh_info, 0,
3002 if (isymbuf == NULL)
3006 /* Get the value of the symbol referred to
3008 if (ELF32_R_SYM (rel->r_info)
3009 < symtab_hdr->sh_info)
3011 /* A local symbol. */
3015 + ELF32_R_SYM (rel->r_info);
3016 sym_sec = bfd_section_from_elf_index
3017 (abfd, isym->st_shndx);
3018 symval = isym->st_value;
3020 /* If the reloc is absolute, it will not
3021 have a symbol or section associated
3027 sym_sec->output_section->vma
3028 + sym_sec->output_offset;
3029 reloc_target = symval + rel->r_addend;
3033 reloc_target = symval + rel->r_addend;
3034 /* Reference symbol is absolute. */
3037 /* else ... reference symbol is extern. */
3039 if (address_of_ret == reloc_target)
3041 deleting_ret_is_safe = 0;
3044 "rjmp/jmp ret sequence at address"
3045 " 0x%x could not be deleted. ret"
3046 " is target of a relocation.\n",
3047 (int) address_of_ret);
3053 if (deleting_ret_is_safe)
3056 printf ("unreachable ret instruction "
3057 "at address 0x%x deleted.\n",
3058 (int) dot + insn_size);
3060 /* Delete two bytes of data. */
3061 if (!elf32_avr_relax_delete_bytes (abfd, sec,
3062 irel->r_offset + insn_size, 2,
3066 /* That will change things, so, we should relax
3067 again. Note that this is not required, and it
3082 /* Look through all the property records in this section to see if
3083 there's any alignment records that can be moved. */
3084 struct avr_relax_info *relax_info;
3086 relax_info = get_avr_relax_info (sec);
3087 if (relax_info->records.count > 0)
3091 for (i = 0; i < relax_info->records.count; ++i)
3093 switch (relax_info->records.items [i].type)
3096 case RECORD_ORG_AND_FILL:
3099 case RECORD_ALIGN_AND_FILL:
3101 struct avr_property_record *record;
3102 unsigned long bytes_to_align;
3105 /* Look for alignment directives that have had enough
3106 bytes deleted before them, such that the directive
3107 can be moved backwards and still maintain the
3108 required alignment. */
3109 record = &relax_info->records.items [i];
3111 = (unsigned long) (1 << record->data.align.bytes);
3112 while (record->data.align.preceding_deleted >=
3115 record->data.align.preceding_deleted
3117 count += bytes_to_align;
3122 bfd_vma addr = record->offset;
3124 /* We can delete COUNT bytes and this alignment
3125 directive will still be correctly aligned.
3126 First move the alignment directive, then delete
3128 record->offset -= count;
3129 elf32_avr_relax_delete_bytes (abfd, sec,
3141 if (contents != NULL
3142 && elf_section_data (sec)->this_hdr.contents != contents)
3144 if (! link_info->keep_memory)
3148 /* Cache the section contents for elf_link_input_bfd. */
3149 elf_section_data (sec)->this_hdr.contents = contents;
3153 if (internal_relocs != NULL
3154 && elf_section_data (sec)->relocs != internal_relocs)
3155 free (internal_relocs);
3161 && symtab_hdr->contents != (unsigned char *) isymbuf)
3163 if (contents != NULL
3164 && elf_section_data (sec)->this_hdr.contents != contents)
3166 if (internal_relocs != NULL
3167 && elf_section_data (sec)->relocs != internal_relocs)
3168 free (internal_relocs);
3173 /* This is a version of bfd_generic_get_relocated_section_contents
3174 which uses elf32_avr_relocate_section.
3176 For avr it's essentially a cut and paste taken from the H8300 port.
3177 The author of the relaxation support patch for avr had absolutely no
3178 clue what is happening here but found out that this part of the code
3179 seems to be important. */
3182 elf32_avr_get_relocated_section_contents (bfd *output_bfd,
3183 struct bfd_link_info *link_info,
3184 struct bfd_link_order *link_order,
3186 bfd_boolean relocatable,
3189 Elf_Internal_Shdr *symtab_hdr;
3190 asection *input_section = link_order->u.indirect.section;
3191 bfd *input_bfd = input_section->owner;
3192 asection **sections = NULL;
3193 Elf_Internal_Rela *internal_relocs = NULL;
3194 Elf_Internal_Sym *isymbuf = NULL;
3196 /* We only need to handle the case of relaxing, or of having a
3197 particular set of section contents, specially. */
3199 || elf_section_data (input_section)->this_hdr.contents == NULL)
3200 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3204 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3206 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3207 (size_t) input_section->size);
3209 if ((input_section->flags & SEC_RELOC) != 0
3210 && input_section->reloc_count > 0)
3213 Elf_Internal_Sym *isym, *isymend;
3216 internal_relocs = (_bfd_elf_link_read_relocs
3217 (input_bfd, input_section, NULL, NULL, FALSE));
3218 if (internal_relocs == NULL)
3221 if (symtab_hdr->sh_info != 0)
3223 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3224 if (isymbuf == NULL)
3225 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3226 symtab_hdr->sh_info, 0,
3228 if (isymbuf == NULL)
3232 amt = symtab_hdr->sh_info;
3233 amt *= sizeof (asection *);
3234 sections = bfd_malloc (amt);
3235 if (sections == NULL && amt != 0)
3238 isymend = isymbuf + symtab_hdr->sh_info;
3239 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3243 if (isym->st_shndx == SHN_UNDEF)
3244 isec = bfd_und_section_ptr;
3245 else if (isym->st_shndx == SHN_ABS)
3246 isec = bfd_abs_section_ptr;
3247 else if (isym->st_shndx == SHN_COMMON)
3248 isec = bfd_com_section_ptr;
3250 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3255 if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
3256 input_section, data, internal_relocs,
3260 if (sections != NULL)
3263 && symtab_hdr->contents != (unsigned char *) isymbuf)
3265 if (elf_section_data (input_section)->relocs != internal_relocs)
3266 free (internal_relocs);
3272 if (sections != NULL)
3275 && symtab_hdr->contents != (unsigned char *) isymbuf)
3277 if (internal_relocs != NULL
3278 && elf_section_data (input_section)->relocs != internal_relocs)
3279 free (internal_relocs);
3284 /* Determines the hash entry name for a particular reloc. It consists of
3285 the identifier of the symbol section and the added reloc addend and
3286 symbol offset relative to the section the symbol is attached to. */
3289 avr_stub_name (const asection *symbol_section,
3290 const bfd_vma symbol_offset,
3291 const Elf_Internal_Rela *rela)
3296 len = 8 + 1 + 8 + 1 + 1;
3297 stub_name = bfd_malloc (len);
3298 if (stub_name != NULL)
3299 sprintf (stub_name, "%08x+%08x",
3300 symbol_section->id & 0xffffffff,
3301 (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
3307 /* Add a new stub entry to the stub hash. Not all fields of the new
3308 stub entry are initialised. */
3310 static struct elf32_avr_stub_hash_entry *
3311 avr_add_stub (const char *stub_name,
3312 struct elf32_avr_link_hash_table *htab)
3314 struct elf32_avr_stub_hash_entry *hsh;
3316 /* Enter this entry into the linker stub hash table. */
3317 hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);
3321 /* xgettext:c-format */
3322 _bfd_error_handler (_("cannot create stub entry %s"), stub_name);
3326 hsh->stub_offset = 0;
3330 /* We assume that there is already space allocated for the stub section
3331 contents and that before building the stubs the section size is
3332 initialized to 0. We assume that within the stub hash table entry,
3333 the absolute position of the jmp target has been written in the
3334 target_value field. We write here the offset of the generated jmp insn
3335 relative to the trampoline section start to the stub_offset entry in
3336 the stub hash table entry. */
3339 avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3341 struct elf32_avr_stub_hash_entry *hsh;
3342 struct bfd_link_info *info;
3343 struct elf32_avr_link_hash_table *htab;
3350 bfd_vma jmp_insn = 0x0000940c;
3352 /* Massage our args to the form they really have. */
3353 hsh = avr_stub_hash_entry (bh);
3355 if (!hsh->is_actually_needed)
3358 info = (struct bfd_link_info *) in_arg;
3360 htab = avr_link_hash_table (info);
3364 target = hsh->target_value;
3366 /* Make a note of the offset within the stubs for this entry. */
3367 hsh->stub_offset = htab->stub_sec->size;
3368 loc = htab->stub_sec->contents + hsh->stub_offset;
3370 stub_bfd = htab->stub_sec->owner;
3373 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3374 (unsigned int) target,
3375 (unsigned int) hsh->stub_offset);
3377 /* We now have to add the information on the jump target to the bare
3378 opcode bits already set in jmp_insn. */
3380 /* Check for the alignment of the address. */
3384 starget = target >> 1;
3385 jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
3386 bfd_put_16 (stub_bfd, jmp_insn, loc);
3387 bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
3389 htab->stub_sec->size += 4;
3391 /* Now add the entries in the address mapping table if there is still
3396 nr = htab->amt_entry_cnt + 1;
3397 if (nr <= htab->amt_max_entry_cnt)
3399 htab->amt_entry_cnt = nr;
3401 htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
3402 htab->amt_destination_addr[nr - 1] = target;
3410 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
3411 void *in_arg ATTRIBUTE_UNUSED)
3413 struct elf32_avr_stub_hash_entry *hsh;
3415 hsh = avr_stub_hash_entry (bh);
3416 hsh->is_actually_needed = FALSE;
3422 avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3424 struct elf32_avr_stub_hash_entry *hsh;
3425 struct elf32_avr_link_hash_table *htab;
3428 /* Massage our args to the form they really have. */
3429 hsh = avr_stub_hash_entry (bh);
3432 if (hsh->is_actually_needed)
3437 htab->stub_sec->size += size;
3442 elf32_avr_setup_params (struct bfd_link_info *info,
3444 asection *avr_stub_section,
3445 bfd_boolean no_stubs,
3446 bfd_boolean deb_stubs,
3447 bfd_boolean deb_relax,
3448 bfd_vma pc_wrap_around,
3449 bfd_boolean call_ret_replacement)
3451 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3455 htab->stub_sec = avr_stub_section;
3456 htab->stub_bfd = avr_stub_bfd;
3457 htab->no_stubs = no_stubs;
3459 debug_relax = deb_relax;
3460 debug_stubs = deb_stubs;
3461 avr_pc_wrap_around = pc_wrap_around;
3462 avr_replace_call_ret_sequences = call_ret_replacement;
3466 /* Set up various things so that we can make a list of input sections
3467 for each output section included in the link. Returns -1 on error,
3468 0 when no stubs will be needed, and 1 on success. It also sets
3469 information on the stubs bfd and the stub section in the info
3473 elf32_avr_setup_section_lists (bfd *output_bfd,
3474 struct bfd_link_info *info)
3477 unsigned int bfd_count;
3478 unsigned int top_id, top_index;
3480 asection **input_list, **list;
3482 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3484 if (htab == NULL || htab->no_stubs)
3487 /* Count the number of input BFDs and find the top input section id. */
3488 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3490 input_bfd = input_bfd->link.next)
3493 for (section = input_bfd->sections;
3495 section = section->next)
3496 if (top_id < section->id)
3497 top_id = section->id;
3500 htab->bfd_count = bfd_count;
3502 /* We can't use output_bfd->section_count here to find the top output
3503 section index as some sections may have been removed, and
3504 strip_excluded_output_sections doesn't renumber the indices. */
3505 for (section = output_bfd->sections, top_index = 0;
3507 section = section->next)
3508 if (top_index < section->index)
3509 top_index = section->index;
3511 htab->top_index = top_index;
3512 amt = sizeof (asection *) * (top_index + 1);
3513 input_list = bfd_malloc (amt);
3514 htab->input_list = input_list;
3515 if (input_list == NULL)
3518 /* For sections we aren't interested in, mark their entries with a
3519 value we can check later. */
3520 list = input_list + top_index;
3522 *list = bfd_abs_section_ptr;
3523 while (list-- != input_list);
3525 for (section = output_bfd->sections;
3527 section = section->next)
3528 if ((section->flags & SEC_CODE) != 0)
3529 input_list[section->index] = NULL;
3535 /* Read in all local syms for all input bfds, and create hash entries
3536 for export stubs if we are building a multi-subspace shared lib.
3537 Returns -1 on error, 0 otherwise. */
3540 get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
3542 unsigned int bfd_indx;
3543 Elf_Internal_Sym *local_syms, **all_local_syms;
3544 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3550 /* We want to read in symbol extension records only once. To do this
3551 we need to read in the local symbols in parallel and save them for
3552 later use; so hold pointers to the local symbols in an array. */
3553 amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3554 all_local_syms = bfd_zmalloc (amt);
3555 htab->all_local_syms = all_local_syms;
3556 if (all_local_syms == NULL)
3559 /* Walk over all the input BFDs, swapping in local symbols.
3560 If we are creating a shared library, create hash entries for the
3564 input_bfd = input_bfd->link.next, bfd_indx++)
3566 Elf_Internal_Shdr *symtab_hdr;
3568 /* We'll need the symbol table in a second. */
3569 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3570 if (symtab_hdr->sh_info == 0)
3573 /* We need an array of the local symbols attached to the input bfd. */
3574 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3575 if (local_syms == NULL)
3577 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3578 symtab_hdr->sh_info, 0,
3580 /* Cache them for elf_link_input_bfd. */
3581 symtab_hdr->contents = (unsigned char *) local_syms;
3583 if (local_syms == NULL)
3586 all_local_syms[bfd_indx] = local_syms;
3592 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3595 elf32_avr_size_stubs (bfd *output_bfd,
3596 struct bfd_link_info *info,
3597 bfd_boolean is_prealloc_run)
3599 struct elf32_avr_link_hash_table *htab;
3600 int stub_changed = 0;
3602 htab = avr_link_hash_table (info);
3606 /* At this point we initialize htab->vector_base
3607 To the start of the text output section. */
3608 htab->vector_base = htab->stub_sec->output_section->vma;
3610 if (get_local_syms (info->input_bfds, info))
3612 if (htab->all_local_syms)
3613 goto error_ret_free_local;
3617 if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
3619 struct elf32_avr_stub_hash_entry *test;
3621 test = avr_add_stub ("Hugo",htab);
3622 test->target_value = 0x123456;
3623 test->stub_offset = 13;
3625 test = avr_add_stub ("Hugo2",htab);
3626 test->target_value = 0x84210;
3627 test->stub_offset = 14;
3633 unsigned int bfd_indx;
3635 /* We will have to re-generate the stub hash table each time anything
3636 in memory has changed. */
3638 bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
3639 for (input_bfd = info->input_bfds, bfd_indx = 0;
3641 input_bfd = input_bfd->link.next, bfd_indx++)
3643 Elf_Internal_Shdr *symtab_hdr;
3645 Elf_Internal_Sym *local_syms;
3647 /* We'll need the symbol table in a second. */
3648 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3649 if (symtab_hdr->sh_info == 0)
3652 local_syms = htab->all_local_syms[bfd_indx];
3654 /* Walk over each section attached to the input bfd. */
3655 for (section = input_bfd->sections;
3657 section = section->next)
3659 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3661 /* If there aren't any relocs, then there's nothing more
3663 if ((section->flags & SEC_RELOC) == 0
3664 || section->reloc_count == 0)
3667 /* If this section is a link-once section that will be
3668 discarded, then don't create any stubs. */
3669 if (section->output_section == NULL
3670 || section->output_section->owner != output_bfd)
3673 /* Get the relocs. */
3675 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3677 if (internal_relocs == NULL)
3678 goto error_ret_free_local;
3680 /* Now examine each relocation. */
3681 irela = internal_relocs;
3682 irelaend = irela + section->reloc_count;
3683 for (; irela < irelaend; irela++)
3685 unsigned int r_type, r_indx;
3686 struct elf32_avr_stub_hash_entry *hsh;
3689 bfd_vma destination;
3690 struct elf_link_hash_entry *hh;
3693 r_type = ELF32_R_TYPE (irela->r_info);
3694 r_indx = ELF32_R_SYM (irela->r_info);
3696 /* Only look for 16 bit GS relocs. No other reloc will need a
3698 if (!((r_type == R_AVR_16_PM)
3699 || (r_type == R_AVR_LO8_LDI_GS)
3700 || (r_type == R_AVR_HI8_LDI_GS)))
3703 /* Now determine the call target, its name, value,
3709 if (r_indx < symtab_hdr->sh_info)
3711 /* It's a local symbol. */
3712 Elf_Internal_Sym *sym;
3713 Elf_Internal_Shdr *hdr;
3716 sym = local_syms + r_indx;
3717 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3718 sym_value = sym->st_value;
3719 shndx = sym->st_shndx;
3720 if (shndx < elf_numsections (input_bfd))
3722 hdr = elf_elfsections (input_bfd)[shndx];
3723 sym_sec = hdr->bfd_section;
3724 destination = (sym_value + irela->r_addend
3725 + sym_sec->output_offset
3726 + sym_sec->output_section->vma);
3731 /* It's an external symbol. */
3734 e_indx = r_indx - symtab_hdr->sh_info;
3735 hh = elf_sym_hashes (input_bfd)[e_indx];
3737 while (hh->root.type == bfd_link_hash_indirect
3738 || hh->root.type == bfd_link_hash_warning)
3739 hh = (struct elf_link_hash_entry *)
3740 (hh->root.u.i.link);
3742 if (hh->root.type == bfd_link_hash_defined
3743 || hh->root.type == bfd_link_hash_defweak)
3745 sym_sec = hh->root.u.def.section;
3746 sym_value = hh->root.u.def.value;
3747 if (sym_sec->output_section != NULL)
3748 destination = (sym_value + irela->r_addend
3749 + sym_sec->output_offset
3750 + sym_sec->output_section->vma);
3752 else if (hh->root.type == bfd_link_hash_undefweak)
3754 if (! bfd_link_pic (info))
3757 else if (hh->root.type == bfd_link_hash_undefined)
3759 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3760 && (ELF_ST_VISIBILITY (hh->other)
3766 bfd_set_error (bfd_error_bad_value);
3768 error_ret_free_internal:
3769 if (elf_section_data (section)->relocs == NULL)
3770 free (internal_relocs);
3771 goto error_ret_free_local;
3775 if (! avr_stub_is_required_for_16_bit_reloc
3776 (destination - htab->vector_base))
3778 if (!is_prealloc_run)
3779 /* We are having a reloc that does't need a stub. */
3782 /* We don't right now know if a stub will be needed.
3783 Let's rather be on the safe side. */
3786 /* Get the name of this stub. */
3787 stub_name = avr_stub_name (sym_sec, sym_value, irela);
3790 goto error_ret_free_internal;
3793 hsh = avr_stub_hash_lookup (&htab->bstab,
3798 /* The proper stub has already been created. Mark it
3799 to be used and write the possibly changed destination
3801 hsh->is_actually_needed = TRUE;
3802 hsh->target_value = destination;
3807 hsh = avr_add_stub (stub_name, htab);
3811 goto error_ret_free_internal;
3814 hsh->is_actually_needed = TRUE;
3815 hsh->target_value = destination;
3818 printf ("Adding stub with destination 0x%x to the"
3819 " hash table.\n", (unsigned int) destination);
3821 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
3823 stub_changed = TRUE;
3826 /* We're done with the internal relocs, free them. */
3827 if (elf_section_data (section)->relocs == NULL)
3828 free (internal_relocs);
3832 /* Re-Calculate the number of needed stubs. */
3833 htab->stub_sec->size = 0;
3834 bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
3839 stub_changed = FALSE;
3842 free (htab->all_local_syms);
3845 error_ret_free_local:
3846 free (htab->all_local_syms);
3851 /* Build all the stubs associated with the current output file. The
3852 stubs are kept in a hash table attached to the main linker hash
3853 table. We also set up the .plt entries for statically linked PIC
3854 functions here. This function is called via hppaelf_finish in the
3858 elf32_avr_build_stubs (struct bfd_link_info *info)
3861 struct bfd_hash_table *table;
3862 struct elf32_avr_link_hash_table *htab;
3863 bfd_size_type total_size = 0;
3865 htab = avr_link_hash_table (info);
3869 /* In case that there were several stub sections: */
3870 for (stub_sec = htab->stub_bfd->sections;
3872 stub_sec = stub_sec->next)
3876 /* Allocate memory to hold the linker stubs. */
3877 size = stub_sec->size;
3880 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3881 if (stub_sec->contents == NULL && size != 0)
3886 /* Allocate memory for the adress mapping table. */
3887 htab->amt_entry_cnt = 0;
3888 htab->amt_max_entry_cnt = total_size / 4;
3889 htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
3890 * htab->amt_max_entry_cnt);
3891 htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
3892 * htab->amt_max_entry_cnt );
3895 printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
3897 /* Build the stubs as directed by the stub hash table. */
3898 table = &htab->bstab;
3899 bfd_hash_traverse (table, avr_build_one_stub, info);
3902 printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
3907 /* Callback used by QSORT to order relocations AP and BP. */
3910 internal_reloc_compare (const void *ap, const void *bp)
3912 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
3913 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
3915 if (a->r_offset != b->r_offset)
3916 return (a->r_offset - b->r_offset);
3918 /* We don't need to sort on these criteria for correctness,
3919 but enforcing a more strict ordering prevents unstable qsort
3920 from behaving differently with different implementations.
3921 Without the code below we get correct but different results
3922 on Solaris 2.7 and 2.8. We would like to always produce the
3923 same results no matter the host. */
3925 if (a->r_info != b->r_info)
3926 return (a->r_info - b->r_info);
3928 return (a->r_addend - b->r_addend);
3931 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3934 avr_is_section_for_address (bfd *abfd, asection *section, bfd_vma address)
3939 vma = bfd_get_section_vma (abfd, section);
3943 size = section->size;
3944 if (address >= vma + size)
3950 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3952 struct avr_find_section_data
3954 /* The address we're looking for. */
3957 /* The section we've found. */
3961 /* Helper function to locate the section holding a certain virtual memory
3962 address. This is called via bfd_map_over_sections. The DATA is an
3963 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3964 has been set to the address to search for, and the section field has
3965 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3966 section field in DATA will be set to SECTION. As an optimisation, if
3967 the section field is already non-null then this function does not
3968 perform any checks, and just returns. */
3971 avr_find_section_for_address (bfd *abfd,
3972 asection *section, void *data)
3974 struct avr_find_section_data *fs_data
3975 = (struct avr_find_section_data *) data;
3977 /* Return if already found. */
3978 if (fs_data->section != NULL)
3981 /* If this section isn't part of the addressable code content, skip it. */
3982 if ((bfd_get_section_flags (abfd, section) & SEC_ALLOC) == 0
3983 && (bfd_get_section_flags (abfd, section) & SEC_CODE) == 0)
3986 if (avr_is_section_for_address (abfd, section, fs_data->address))
3987 fs_data->section = section;
3990 /* Load all of the property records from SEC, a section from ABFD. Return
3991 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
3992 memory for the returned structure, and all of the records pointed too by
3993 the structure are allocated with a single call to malloc, so, only the
3994 pointer returned needs to be free'd. */
3996 static struct avr_property_record_list *
3997 avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
3999 char *contents = NULL, *ptr;
4000 bfd_size_type size, mem_size;
4001 bfd_byte version, flags;
4002 uint16_t record_count, i;
4003 struct avr_property_record_list *r_list = NULL;
4004 Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
4005 struct avr_find_section_data fs_data;
4007 fs_data.section = NULL;
4009 size = bfd_get_section_size (sec);
4010 contents = bfd_malloc (size);
4011 bfd_get_section_contents (abfd, sec, contents, 0, size);
4014 /* Load the relocations for the '.avr.prop' section if there are any, and
4016 internal_relocs = (_bfd_elf_link_read_relocs
4017 (abfd, sec, NULL, NULL, FALSE));
4018 if (internal_relocs)
4019 qsort (internal_relocs, sec->reloc_count,
4020 sizeof (Elf_Internal_Rela), internal_reloc_compare);
4022 /* There is a header at the start of the property record section SEC, the
4023 format of this header is:
4024 uint8_t : version number
4026 uint16_t : record counter
4029 /* Check we have at least got a headers worth of bytes. */
4030 if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
4033 version = *((bfd_byte *) ptr);
4035 flags = *((bfd_byte *) ptr);
4037 record_count = *((uint16_t *) ptr);
4039 BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
4041 /* Now allocate space for the list structure, and all of the list
4042 elements in a single block. */
4043 mem_size = sizeof (struct avr_property_record_list)
4044 + sizeof (struct avr_property_record) * record_count;
4045 r_list = bfd_malloc (mem_size);
4049 r_list->version = version;
4050 r_list->flags = flags;
4051 r_list->section = sec;
4052 r_list->record_count = record_count;
4053 r_list->records = (struct avr_property_record *) (&r_list [1]);
4054 size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
4056 /* Check that we understand the version number. There is only one
4057 version number right now, anything else is an error. */
4058 if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
4061 rel = internal_relocs;
4062 rel_end = rel + sec->reloc_count;
4063 for (i = 0; i < record_count; ++i)
4067 /* Each entry is a 32-bit address, followed by a single byte type.
4068 After that is the type specific data. We must take care to
4069 ensure that we don't read beyond the end of the section data. */
4073 r_list->records [i].section = NULL;
4074 r_list->records [i].offset = 0;
4078 /* The offset of the address within the .avr.prop section. */
4079 size_t offset = ptr - contents;
4081 while (rel < rel_end && rel->r_offset < offset)
4086 else if (rel->r_offset == offset)
4088 /* Find section and section offset. */
4089 unsigned long r_symndx;
4094 r_symndx = ELF32_R_SYM (rel->r_info);
4095 rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
4096 sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
4099 r_list->records [i].section = rel_sec;
4100 r_list->records [i].offset = sec_offset;
4104 address = *((uint32_t *) ptr);
4108 if (r_list->records [i].section == NULL)
4110 /* Try to find section and offset from address. */
4111 if (fs_data.section != NULL
4112 && !avr_is_section_for_address (abfd, fs_data.section,
4114 fs_data.section = NULL;
4116 if (fs_data.section == NULL)
4118 fs_data.address = address;
4119 bfd_map_over_sections (abfd, avr_find_section_for_address,
4123 if (fs_data.section == NULL)
4125 fprintf (stderr, "Failed to find matching section.\n");
4129 r_list->records [i].section = fs_data.section;
4130 r_list->records [i].offset
4131 = address - bfd_get_section_vma (abfd, fs_data.section);
4134 r_list->records [i].type = *((bfd_byte *) ptr);
4138 switch (r_list->records [i].type)
4141 /* Nothing else to load. */
4143 case RECORD_ORG_AND_FILL:
4144 /* Just a 4-byte fill to load. */
4147 r_list->records [i].data.org.fill = *((uint32_t *) ptr);
4152 /* Just a 4-byte alignment to load. */
4155 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4158 /* Just initialise PRECEDING_DELETED field, this field is
4159 used during linker relaxation. */
4160 r_list->records [i].data.align.preceding_deleted = 0;
4162 case RECORD_ALIGN_AND_FILL:
4163 /* A 4-byte alignment, and a 4-byte fill to load. */
4166 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4168 r_list->records [i].data.align.fill = *((uint32_t *) ptr);
4171 /* Just initialise PRECEDING_DELETED field, this field is
4172 used during linker relaxation. */
4173 r_list->records [i].data.align.preceding_deleted = 0;
4181 if (elf_section_data (sec)->relocs != internal_relocs)
4182 free (internal_relocs);
4186 if (elf_section_data (sec)->relocs != internal_relocs)
4187 free (internal_relocs);
4193 /* Load all of the property records from ABFD. See
4194 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4196 struct avr_property_record_list *
4197 avr_elf32_load_property_records (bfd *abfd)
4201 /* Find the '.avr.prop' section and load the contents into memory. */
4202 sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
4205 return avr_elf32_load_records_from_section (abfd, sec);
4209 avr_elf32_property_record_name (struct avr_property_record *rec)
4218 case RECORD_ORG_AND_FILL:
4224 case RECORD_ALIGN_AND_FILL:
4235 #define ELF_ARCH bfd_arch_avr
4236 #define ELF_TARGET_ID AVR_ELF_DATA
4237 #define ELF_MACHINE_CODE EM_AVR
4238 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4239 #define ELF_MAXPAGESIZE 1
4241 #define TARGET_LITTLE_SYM avr_elf32_vec
4242 #define TARGET_LITTLE_NAME "elf32-avr"
4244 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4246 #define elf_info_to_howto avr_info_to_howto_rela
4247 #define elf_info_to_howto_rel NULL
4248 #define elf_backend_relocate_section elf32_avr_relocate_section
4249 #define elf_backend_can_gc_sections 1
4250 #define elf_backend_rela_normal 1
4251 #define elf_backend_final_write_processing \
4252 bfd_elf_avr_final_write_processing
4253 #define elf_backend_object_p elf32_avr_object_p
4255 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4256 #define bfd_elf32_bfd_get_relocated_section_contents \
4257 elf32_avr_get_relocated_section_contents
4258 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4260 #include "elf32-target.h"