1 /* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999-2019 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"
29 /* Enable debugging printout at stdout with this variable. */
30 static bfd_boolean debug_relax = FALSE;
32 /* Enable debugging printout at stdout with this variable. */
33 static bfd_boolean debug_stubs = FALSE;
35 static bfd_reloc_status_type
36 bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *,
37 asection *, bfd *, char **);
39 /* Hash table initialization and handling. Code is taken from the hppa port
40 and adapted to the needs of AVR. */
42 /* We use two hash tables to hold information for linking avr objects.
44 The first is the elf32_avr_link_hash_table which is derived from the
45 stanard ELF linker hash table. We use this as a place to attach the other
46 hash table and some static information.
48 The second is the stub hash table which is derived from the base BFD
49 hash table. The stub hash table holds the information on the linker
52 struct elf32_avr_stub_hash_entry
54 /* Base hash table entry structure. */
55 struct bfd_hash_entry bh_root;
57 /* Offset within stub_sec of the beginning of this stub. */
60 /* Given the symbol's value and its section we can determine its final
61 value when building the stubs (so the stub knows where to jump). */
64 /* This way we could mark stubs to be no longer necessary. */
65 bfd_boolean is_actually_needed;
68 struct elf32_avr_link_hash_table
70 /* The main hash table. */
71 struct elf_link_hash_table etab;
73 /* The stub hash table. */
74 struct bfd_hash_table bstab;
78 /* Linker stub bfd. */
81 /* The stub section. */
84 /* Usually 0, unless we are generating code for a bootloader. Will
85 be initialized by elf32_avr_size_stubs to the vma offset of the
86 output section associated with the stub section. */
89 /* Assorted information used by elf32_avr_size_stubs. */
90 unsigned int bfd_count;
91 unsigned int top_index;
92 asection ** input_list;
93 Elf_Internal_Sym ** all_local_syms;
95 /* Tables for mapping vma beyond the 128k boundary to the address of the
96 corresponding stub. (AMT)
97 "amt_max_entry_cnt" reflects the number of entries that memory is allocated
98 for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
99 "amt_entry_cnt" informs how many of these entries actually contain
101 unsigned int amt_entry_cnt;
102 unsigned int amt_max_entry_cnt;
103 bfd_vma * amt_stub_offsets;
104 bfd_vma * amt_destination_addr;
107 /* Various hash macros and functions. */
108 #define avr_link_hash_table(p) \
109 /* PR 3874: Check that we have an AVR style hash table before using it. */\
110 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
111 == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL)
113 #define avr_stub_hash_entry(ent) \
114 ((struct elf32_avr_stub_hash_entry *)(ent))
116 #define avr_stub_hash_lookup(table, string, create, copy) \
117 ((struct elf32_avr_stub_hash_entry *) \
118 bfd_hash_lookup ((table), (string), (create), (copy)))
120 static reloc_howto_type elf_avr_howto_table[] =
122 HOWTO (R_AVR_NONE, /* type */
124 3, /* size (0 = byte, 1 = short, 2 = long) */
126 FALSE, /* pc_relative */
128 complain_overflow_dont, /* complain_on_overflow */
129 bfd_elf_generic_reloc, /* special_function */
130 "R_AVR_NONE", /* name */
131 FALSE, /* partial_inplace */
134 FALSE), /* pcrel_offset */
136 HOWTO (R_AVR_32, /* type */
138 2, /* size (0 = byte, 1 = short, 2 = long) */
140 FALSE, /* pc_relative */
142 complain_overflow_bitfield, /* complain_on_overflow */
143 bfd_elf_generic_reloc, /* special_function */
144 "R_AVR_32", /* name */
145 FALSE, /* partial_inplace */
146 0xffffffff, /* src_mask */
147 0xffffffff, /* dst_mask */
148 FALSE), /* pcrel_offset */
150 /* A 7 bit PC relative relocation. */
151 HOWTO (R_AVR_7_PCREL, /* type */
153 1, /* size (0 = byte, 1 = short, 2 = long) */
155 TRUE, /* pc_relative */
157 complain_overflow_bitfield, /* complain_on_overflow */
158 bfd_elf_generic_reloc, /* special_function */
159 "R_AVR_7_PCREL", /* name */
160 FALSE, /* partial_inplace */
161 0xffff, /* src_mask */
162 0xffff, /* dst_mask */
163 TRUE), /* pcrel_offset */
165 /* A 13 bit PC relative relocation. */
166 HOWTO (R_AVR_13_PCREL, /* type */
168 1, /* size (0 = byte, 1 = short, 2 = long) */
170 TRUE, /* pc_relative */
172 complain_overflow_bitfield, /* complain_on_overflow */
173 bfd_elf_generic_reloc, /* special_function */
174 "R_AVR_13_PCREL", /* name */
175 FALSE, /* partial_inplace */
176 0xfff, /* src_mask */
177 0xfff, /* dst_mask */
178 TRUE), /* pcrel_offset */
180 /* A 16 bit absolute relocation. */
181 HOWTO (R_AVR_16, /* type */
183 1, /* size (0 = byte, 1 = short, 2 = long) */
185 FALSE, /* pc_relative */
187 complain_overflow_dont, /* complain_on_overflow */
188 bfd_elf_generic_reloc, /* special_function */
189 "R_AVR_16", /* name */
190 FALSE, /* partial_inplace */
191 0xffff, /* src_mask */
192 0xffff, /* dst_mask */
193 FALSE), /* pcrel_offset */
195 /* A 16 bit absolute relocation for command address
196 Will be changed when linker stubs are needed. */
197 HOWTO (R_AVR_16_PM, /* type */
199 1, /* size (0 = byte, 1 = short, 2 = long) */
201 FALSE, /* pc_relative */
203 complain_overflow_bitfield, /* complain_on_overflow */
204 bfd_elf_generic_reloc, /* special_function */
205 "R_AVR_16_PM", /* name */
206 FALSE, /* partial_inplace */
207 0xffff, /* src_mask */
208 0xffff, /* dst_mask */
209 FALSE), /* pcrel_offset */
210 /* A low 8 bit absolute relocation of 16 bit address.
212 HOWTO (R_AVR_LO8_LDI, /* type */
214 1, /* size (0 = byte, 1 = short, 2 = long) */
216 FALSE, /* pc_relative */
218 complain_overflow_dont, /* complain_on_overflow */
219 bfd_elf_generic_reloc, /* special_function */
220 "R_AVR_LO8_LDI", /* name */
221 FALSE, /* partial_inplace */
222 0xffff, /* src_mask */
223 0xffff, /* dst_mask */
224 FALSE), /* pcrel_offset */
225 /* A high 8 bit absolute relocation of 16 bit address.
227 HOWTO (R_AVR_HI8_LDI, /* type */
229 1, /* size (0 = byte, 1 = short, 2 = long) */
231 FALSE, /* pc_relative */
233 complain_overflow_dont, /* complain_on_overflow */
234 bfd_elf_generic_reloc, /* special_function */
235 "R_AVR_HI8_LDI", /* name */
236 FALSE, /* partial_inplace */
237 0xffff, /* src_mask */
238 0xffff, /* dst_mask */
239 FALSE), /* pcrel_offset */
240 /* A high 6 bit absolute relocation of 22 bit address.
241 For LDI command. As well second most significant 8 bit value of
242 a 32 bit link-time constant. */
243 HOWTO (R_AVR_HH8_LDI, /* type */
245 1, /* size (0 = byte, 1 = short, 2 = long) */
247 FALSE, /* pc_relative */
249 complain_overflow_dont, /* complain_on_overflow */
250 bfd_elf_generic_reloc, /* special_function */
251 "R_AVR_HH8_LDI", /* name */
252 FALSE, /* partial_inplace */
253 0xffff, /* src_mask */
254 0xffff, /* dst_mask */
255 FALSE), /* pcrel_offset */
256 /* A negative low 8 bit absolute relocation of 16 bit address.
258 HOWTO (R_AVR_LO8_LDI_NEG, /* type */
260 1, /* size (0 = byte, 1 = short, 2 = long) */
262 FALSE, /* pc_relative */
264 complain_overflow_dont, /* complain_on_overflow */
265 bfd_elf_generic_reloc, /* special_function */
266 "R_AVR_LO8_LDI_NEG", /* name */
267 FALSE, /* partial_inplace */
268 0xffff, /* src_mask */
269 0xffff, /* dst_mask */
270 FALSE), /* pcrel_offset */
271 /* A negative high 8 bit absolute relocation of 16 bit address.
273 HOWTO (R_AVR_HI8_LDI_NEG, /* type */
275 1, /* size (0 = byte, 1 = short, 2 = long) */
277 FALSE, /* pc_relative */
279 complain_overflow_dont, /* complain_on_overflow */
280 bfd_elf_generic_reloc, /* special_function */
281 "R_AVR_HI8_LDI_NEG", /* name */
282 FALSE, /* partial_inplace */
283 0xffff, /* src_mask */
284 0xffff, /* dst_mask */
285 FALSE), /* pcrel_offset */
286 /* A negative high 6 bit absolute relocation of 22 bit address.
288 HOWTO (R_AVR_HH8_LDI_NEG, /* type */
290 1, /* size (0 = byte, 1 = short, 2 = long) */
292 FALSE, /* pc_relative */
294 complain_overflow_dont, /* complain_on_overflow */
295 bfd_elf_generic_reloc, /* special_function */
296 "R_AVR_HH8_LDI_NEG", /* name */
297 FALSE, /* partial_inplace */
298 0xffff, /* src_mask */
299 0xffff, /* dst_mask */
300 FALSE), /* pcrel_offset */
301 /* A low 8 bit absolute relocation of 24 bit program memory address.
302 For LDI command. Will not be changed when linker stubs are needed. */
303 HOWTO (R_AVR_LO8_LDI_PM, /* type */
305 1, /* size (0 = byte, 1 = short, 2 = long) */
307 FALSE, /* pc_relative */
309 complain_overflow_dont, /* complain_on_overflow */
310 bfd_elf_generic_reloc, /* special_function */
311 "R_AVR_LO8_LDI_PM", /* name */
312 FALSE, /* partial_inplace */
313 0xffff, /* src_mask */
314 0xffff, /* dst_mask */
315 FALSE), /* pcrel_offset */
316 /* A low 8 bit absolute relocation of 24 bit program memory address.
317 For LDI command. Will not be changed when linker stubs are needed. */
318 HOWTO (R_AVR_HI8_LDI_PM, /* type */
320 1, /* size (0 = byte, 1 = short, 2 = long) */
322 FALSE, /* pc_relative */
324 complain_overflow_dont, /* complain_on_overflow */
325 bfd_elf_generic_reloc, /* special_function */
326 "R_AVR_HI8_LDI_PM", /* name */
327 FALSE, /* partial_inplace */
328 0xffff, /* src_mask */
329 0xffff, /* dst_mask */
330 FALSE), /* pcrel_offset */
331 /* A low 8 bit absolute relocation of 24 bit program memory address.
332 For LDI command. Will not be changed when linker stubs are needed. */
333 HOWTO (R_AVR_HH8_LDI_PM, /* type */
335 1, /* size (0 = byte, 1 = short, 2 = long) */
337 FALSE, /* pc_relative */
339 complain_overflow_dont, /* complain_on_overflow */
340 bfd_elf_generic_reloc, /* special_function */
341 "R_AVR_HH8_LDI_PM", /* name */
342 FALSE, /* partial_inplace */
343 0xffff, /* src_mask */
344 0xffff, /* dst_mask */
345 FALSE), /* pcrel_offset */
346 /* A low 8 bit absolute relocation of 24 bit program memory address.
347 For LDI command. Will not be changed when linker stubs are needed. */
348 HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */
350 1, /* size (0 = byte, 1 = short, 2 = long) */
352 FALSE, /* pc_relative */
354 complain_overflow_dont, /* complain_on_overflow */
355 bfd_elf_generic_reloc, /* special_function */
356 "R_AVR_LO8_LDI_PM_NEG", /* name */
357 FALSE, /* partial_inplace */
358 0xffff, /* src_mask */
359 0xffff, /* dst_mask */
360 FALSE), /* pcrel_offset */
361 /* A low 8 bit absolute relocation of 24 bit program memory address.
362 For LDI command. Will not be changed when linker stubs are needed. */
363 HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */
365 1, /* size (0 = byte, 1 = short, 2 = long) */
367 FALSE, /* pc_relative */
369 complain_overflow_dont, /* complain_on_overflow */
370 bfd_elf_generic_reloc, /* special_function */
371 "R_AVR_HI8_LDI_PM_NEG", /* name */
372 FALSE, /* partial_inplace */
373 0xffff, /* src_mask */
374 0xffff, /* dst_mask */
375 FALSE), /* pcrel_offset */
376 /* A low 8 bit absolute relocation of 24 bit program memory address.
377 For LDI command. Will not be changed when linker stubs are needed. */
378 HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */
380 1, /* size (0 = byte, 1 = short, 2 = long) */
382 FALSE, /* pc_relative */
384 complain_overflow_dont, /* complain_on_overflow */
385 bfd_elf_generic_reloc, /* special_function */
386 "R_AVR_HH8_LDI_PM_NEG", /* name */
387 FALSE, /* partial_inplace */
388 0xffff, /* src_mask */
389 0xffff, /* dst_mask */
390 FALSE), /* pcrel_offset */
391 /* Relocation for CALL command in ATmega. */
392 HOWTO (R_AVR_CALL, /* type */
394 2, /* size (0 = byte, 1 = short, 2 = long) */
396 FALSE, /* pc_relative */
398 complain_overflow_dont,/* complain_on_overflow */
399 bfd_elf_generic_reloc, /* special_function */
400 "R_AVR_CALL", /* name */
401 FALSE, /* partial_inplace */
402 0xffffffff, /* src_mask */
403 0xffffffff, /* dst_mask */
404 FALSE), /* pcrel_offset */
405 /* A 16 bit absolute relocation of 16 bit address.
407 HOWTO (R_AVR_LDI, /* type */
409 1, /* size (0 = byte, 1 = short, 2 = long) */
411 FALSE, /* pc_relative */
413 complain_overflow_dont,/* complain_on_overflow */
414 bfd_elf_generic_reloc, /* special_function */
415 "R_AVR_LDI", /* name */
416 FALSE, /* partial_inplace */
417 0xffff, /* src_mask */
418 0xffff, /* dst_mask */
419 FALSE), /* pcrel_offset */
420 /* A 6 bit absolute relocation of 6 bit offset.
421 For ldd/sdd command. */
422 HOWTO (R_AVR_6, /* type */
424 0, /* size (0 = byte, 1 = short, 2 = long) */
426 FALSE, /* pc_relative */
428 complain_overflow_dont,/* complain_on_overflow */
429 bfd_elf_generic_reloc, /* special_function */
430 "R_AVR_6", /* name */
431 FALSE, /* partial_inplace */
432 0xffff, /* src_mask */
433 0xffff, /* dst_mask */
434 FALSE), /* pcrel_offset */
435 /* A 6 bit absolute relocation of 6 bit offset.
436 For sbiw/adiw command. */
437 HOWTO (R_AVR_6_ADIW, /* type */
439 0, /* size (0 = byte, 1 = short, 2 = long) */
441 FALSE, /* pc_relative */
443 complain_overflow_dont,/* complain_on_overflow */
444 bfd_elf_generic_reloc, /* special_function */
445 "R_AVR_6_ADIW", /* name */
446 FALSE, /* partial_inplace */
447 0xffff, /* src_mask */
448 0xffff, /* dst_mask */
449 FALSE), /* pcrel_offset */
450 /* Most significant 8 bit value of a 32 bit link-time constant. */
451 HOWTO (R_AVR_MS8_LDI, /* type */
453 1, /* size (0 = byte, 1 = short, 2 = long) */
455 FALSE, /* pc_relative */
457 complain_overflow_dont, /* complain_on_overflow */
458 bfd_elf_generic_reloc, /* special_function */
459 "R_AVR_MS8_LDI", /* name */
460 FALSE, /* partial_inplace */
461 0xffff, /* src_mask */
462 0xffff, /* dst_mask */
463 FALSE), /* pcrel_offset */
464 /* Negative most significant 8 bit value of a 32 bit link-time constant. */
465 HOWTO (R_AVR_MS8_LDI_NEG, /* type */
467 1, /* size (0 = byte, 1 = short, 2 = long) */
469 FALSE, /* pc_relative */
471 complain_overflow_dont, /* complain_on_overflow */
472 bfd_elf_generic_reloc, /* special_function */
473 "R_AVR_MS8_LDI_NEG", /* name */
474 FALSE, /* partial_inplace */
475 0xffff, /* src_mask */
476 0xffff, /* dst_mask */
477 FALSE), /* pcrel_offset */
478 /* A low 8 bit absolute relocation of 24 bit program memory address.
479 For LDI command. Will be changed when linker stubs are needed. */
480 HOWTO (R_AVR_LO8_LDI_GS, /* type */
482 1, /* size (0 = byte, 1 = short, 2 = long) */
484 FALSE, /* pc_relative */
486 complain_overflow_dont, /* complain_on_overflow */
487 bfd_elf_generic_reloc, /* special_function */
488 "R_AVR_LO8_LDI_GS", /* name */
489 FALSE, /* partial_inplace */
490 0xffff, /* src_mask */
491 0xffff, /* dst_mask */
492 FALSE), /* pcrel_offset */
493 /* A low 8 bit absolute relocation of 24 bit program memory address.
494 For LDI command. Will be changed when linker stubs are needed. */
495 HOWTO (R_AVR_HI8_LDI_GS, /* type */
497 1, /* size (0 = byte, 1 = short, 2 = long) */
499 FALSE, /* pc_relative */
501 complain_overflow_dont, /* complain_on_overflow */
502 bfd_elf_generic_reloc, /* special_function */
503 "R_AVR_HI8_LDI_GS", /* name */
504 FALSE, /* partial_inplace */
505 0xffff, /* src_mask */
506 0xffff, /* dst_mask */
507 FALSE), /* pcrel_offset */
509 HOWTO (R_AVR_8, /* type */
511 0, /* size (0 = byte, 1 = short, 2 = long) */
513 FALSE, /* pc_relative */
515 complain_overflow_bitfield,/* complain_on_overflow */
516 bfd_elf_generic_reloc, /* special_function */
517 "R_AVR_8", /* name */
518 FALSE, /* partial_inplace */
519 0x000000ff, /* src_mask */
520 0x000000ff, /* dst_mask */
521 FALSE), /* pcrel_offset */
522 /* lo8-part to use in .byte lo8(sym). */
523 HOWTO (R_AVR_8_LO8, /* type */
525 0, /* size (0 = byte, 1 = short, 2 = long) */
527 FALSE, /* pc_relative */
529 complain_overflow_dont,/* complain_on_overflow */
530 bfd_elf_generic_reloc, /* special_function */
531 "R_AVR_8_LO8", /* name */
532 FALSE, /* partial_inplace */
533 0xffffff, /* src_mask */
534 0xffffff, /* dst_mask */
535 FALSE), /* pcrel_offset */
536 /* hi8-part to use in .byte hi8(sym). */
537 HOWTO (R_AVR_8_HI8, /* type */
539 0, /* size (0 = byte, 1 = short, 2 = long) */
541 FALSE, /* pc_relative */
543 complain_overflow_dont,/* complain_on_overflow */
544 bfd_elf_generic_reloc, /* special_function */
545 "R_AVR_8_HI8", /* name */
546 FALSE, /* partial_inplace */
547 0xffffff, /* src_mask */
548 0xffffff, /* dst_mask */
549 FALSE), /* pcrel_offset */
550 /* hlo8-part to use in .byte hlo8(sym). */
551 HOWTO (R_AVR_8_HLO8, /* type */
553 0, /* size (0 = byte, 1 = short, 2 = long) */
555 FALSE, /* pc_relative */
557 complain_overflow_dont,/* complain_on_overflow */
558 bfd_elf_generic_reloc, /* special_function */
559 "R_AVR_8_HLO8", /* name */
560 FALSE, /* partial_inplace */
561 0xffffff, /* src_mask */
562 0xffffff, /* dst_mask */
563 FALSE), /* pcrel_offset */
564 HOWTO (R_AVR_DIFF8, /* type */
566 0, /* size (0 = byte, 1 = short, 2 = long) */
568 FALSE, /* pc_relative */
570 complain_overflow_bitfield, /* complain_on_overflow */
571 bfd_elf_avr_diff_reloc, /* special_function */
572 "R_AVR_DIFF8", /* name */
573 FALSE, /* partial_inplace */
576 FALSE), /* pcrel_offset */
577 HOWTO (R_AVR_DIFF16, /* type */
579 1, /* size (0 = byte, 1 = short, 2 = long) */
581 FALSE, /* pc_relative */
583 complain_overflow_bitfield, /* complain_on_overflow */
584 bfd_elf_avr_diff_reloc,/* special_function */
585 "R_AVR_DIFF16", /* name */
586 FALSE, /* partial_inplace */
588 0xffff, /* dst_mask */
589 FALSE), /* pcrel_offset */
590 HOWTO (R_AVR_DIFF32, /* type */
592 2, /* size (0 = byte, 1 = short, 2 = long) */
594 FALSE, /* pc_relative */
596 complain_overflow_bitfield, /* complain_on_overflow */
597 bfd_elf_avr_diff_reloc,/* special_function */
598 "R_AVR_DIFF32", /* name */
599 FALSE, /* partial_inplace */
601 0xffffffff, /* dst_mask */
602 FALSE), /* pcrel_offset */
603 /* 7 bit immediate for LDS/STS in Tiny core. */
604 HOWTO (R_AVR_LDS_STS_16, /* type */
606 1, /* size (0 = byte, 1 = short, 2 = long) */
608 FALSE, /* pc_relative */
610 complain_overflow_dont,/* complain_on_overflow */
611 bfd_elf_generic_reloc, /* special_function */
612 "R_AVR_LDS_STS_16", /* name */
613 FALSE, /* partial_inplace */
614 0xffff, /* src_mask */
615 0xffff, /* dst_mask */
616 FALSE), /* pcrel_offset */
618 HOWTO (R_AVR_PORT6, /* type */
620 0, /* size (0 = byte, 1 = short, 2 = long) */
622 FALSE, /* pc_relative */
624 complain_overflow_dont,/* complain_on_overflow */
625 bfd_elf_generic_reloc, /* special_function */
626 "R_AVR_PORT6", /* name */
627 FALSE, /* partial_inplace */
628 0xffffff, /* src_mask */
629 0xffffff, /* dst_mask */
630 FALSE), /* pcrel_offset */
631 HOWTO (R_AVR_PORT5, /* type */
633 0, /* size (0 = byte, 1 = short, 2 = long) */
635 FALSE, /* pc_relative */
637 complain_overflow_dont,/* complain_on_overflow */
638 bfd_elf_generic_reloc, /* special_function */
639 "R_AVR_PORT5", /* name */
640 FALSE, /* partial_inplace */
641 0xffffff, /* src_mask */
642 0xffffff, /* dst_mask */
643 FALSE), /* pcrel_offset */
645 /* A 32 bit PC relative relocation. */
646 HOWTO (R_AVR_32_PCREL, /* type */
648 2, /* size (0 = byte, 1 = short, 2 = long) */
650 TRUE, /* pc_relative */
652 complain_overflow_bitfield, /* complain_on_overflow */
653 bfd_elf_generic_reloc, /* special_function */
654 "R_AVR_32_PCREL", /* name */
655 FALSE, /* partial_inplace */
656 0xffffffff, /* src_mask */
657 0xffffffff, /* dst_mask */
658 TRUE), /* pcrel_offset */
661 /* Map BFD reloc types to AVR ELF reloc types. */
665 bfd_reloc_code_real_type bfd_reloc_val;
666 unsigned int elf_reloc_val;
669 static const struct avr_reloc_map avr_reloc_map[] =
671 { BFD_RELOC_NONE, R_AVR_NONE },
672 { BFD_RELOC_32, R_AVR_32 },
673 { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL },
674 { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL },
675 { BFD_RELOC_16, R_AVR_16 },
676 { BFD_RELOC_AVR_16_PM, R_AVR_16_PM },
677 { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI},
678 { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI },
679 { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI },
680 { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI },
681 { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG },
682 { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG },
683 { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG },
684 { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG },
685 { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM },
686 { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS },
687 { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM },
688 { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS },
689 { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM },
690 { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG },
691 { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG },
692 { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG },
693 { BFD_RELOC_AVR_CALL, R_AVR_CALL },
694 { BFD_RELOC_AVR_LDI, R_AVR_LDI },
695 { BFD_RELOC_AVR_6, R_AVR_6 },
696 { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW },
697 { BFD_RELOC_8, R_AVR_8 },
698 { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 },
699 { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 },
700 { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 },
701 { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 },
702 { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 },
703 { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 },
704 { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16},
705 { BFD_RELOC_AVR_PORT6, R_AVR_PORT6},
706 { BFD_RELOC_AVR_PORT5, R_AVR_PORT5},
707 { BFD_RELOC_32_PCREL, R_AVR_32_PCREL}
710 static const struct bfd_elf_special_section elf_avr_special_sections[] =
712 { STRING_COMMA_LEN (".noinit"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
716 /* Meant to be filled one day with the wrap around address for the
717 specific device. I.e. should get the value 0x4000 for 16k devices,
718 0x8000 for 32k devices and so on.
720 We initialize it here with a value of 0x1000000 resulting in
721 that we will never suggest a wrap-around jump during relaxation.
722 The logic of the source code later on assumes that in
723 avr_pc_wrap_around one single bit is set. */
724 static bfd_vma avr_pc_wrap_around = 0x10000000;
726 /* If this variable holds a value different from zero, the linker relaxation
727 machine will try to optimize call/ret sequences by a single jump
728 instruction. This option could be switched off by a linker switch. */
729 static int avr_replace_call_ret_sequences = 1;
732 /* Per-section relaxation related information for avr. */
734 struct avr_relax_info
736 /* Track the avr property records that apply to this section. */
740 /* Number of records in the list. */
743 /* How many records worth of space have we allocated. */
746 /* The records, only COUNT records are initialised. */
747 struct avr_property_record *items;
751 /* Per section data, specialised for avr. */
753 struct elf_avr_section_data
755 /* The standard data must appear first. */
756 struct bfd_elf_section_data elf;
758 /* Relaxation related information. */
759 struct avr_relax_info relax_info;
762 /* Possibly initialise avr specific data for new section SEC from ABFD. */
765 elf_avr_new_section_hook (bfd *abfd, asection *sec)
767 if (!sec->used_by_bfd)
769 struct elf_avr_section_data *sdata;
770 bfd_size_type amt = sizeof (*sdata);
772 sdata = bfd_zalloc (abfd, amt);
775 sec->used_by_bfd = sdata;
778 return _bfd_elf_new_section_hook (abfd, sec);
781 /* Return a pointer to the relaxation information for SEC. */
783 static struct avr_relax_info *
784 get_avr_relax_info (asection *sec)
786 struct elf_avr_section_data *section_data;
788 /* No info available if no section or if it is an output section. */
789 if (!sec || sec == sec->output_section)
792 section_data = (struct elf_avr_section_data *) elf_section_data (sec);
793 return §ion_data->relax_info;
796 /* Initialise the per section relaxation information for SEC. */
799 init_avr_relax_info (asection *sec)
801 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
803 relax_info->records.count = 0;
804 relax_info->records.allocated = 0;
805 relax_info->records.items = NULL;
808 /* Initialize an entry in the stub hash table. */
810 static struct bfd_hash_entry *
811 stub_hash_newfunc (struct bfd_hash_entry *entry,
812 struct bfd_hash_table *table,
815 /* Allocate the structure if it has not already been allocated by a
819 entry = bfd_hash_allocate (table,
820 sizeof (struct elf32_avr_stub_hash_entry));
825 /* Call the allocation method of the superclass. */
826 entry = bfd_hash_newfunc (entry, table, string);
829 struct elf32_avr_stub_hash_entry *hsh;
831 /* Initialize the local fields. */
832 hsh = avr_stub_hash_entry (entry);
833 hsh->stub_offset = 0;
834 hsh->target_value = 0;
840 /* This function is just a straight passthrough to the real
841 function in linker.c. Its prupose is so that its address
842 can be compared inside the avr_link_hash_table macro. */
844 static struct bfd_hash_entry *
845 elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry,
846 struct bfd_hash_table * table,
849 return _bfd_elf_link_hash_newfunc (entry, table, string);
852 /* Free the derived linker hash table. */
855 elf32_avr_link_hash_table_free (bfd *obfd)
857 struct elf32_avr_link_hash_table *htab
858 = (struct elf32_avr_link_hash_table *) obfd->link.hash;
860 /* Free the address mapping table. */
861 if (htab->amt_stub_offsets != NULL)
862 free (htab->amt_stub_offsets);
863 if (htab->amt_destination_addr != NULL)
864 free (htab->amt_destination_addr);
866 bfd_hash_table_free (&htab->bstab);
867 _bfd_elf_link_hash_table_free (obfd);
870 /* Create the derived linker hash table. The AVR ELF port uses the derived
871 hash table to keep information specific to the AVR ELF linker (without
872 using static variables). */
874 static struct bfd_link_hash_table *
875 elf32_avr_link_hash_table_create (bfd *abfd)
877 struct elf32_avr_link_hash_table *htab;
878 bfd_size_type amt = sizeof (*htab);
880 htab = bfd_zmalloc (amt);
884 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
885 elf32_avr_link_hash_newfunc,
886 sizeof (struct elf_link_hash_entry),
893 /* Init the stub hash table too. */
894 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
895 sizeof (struct elf32_avr_stub_hash_entry)))
897 _bfd_elf_link_hash_table_free (abfd);
900 htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free;
902 return &htab->etab.root;
905 /* Calculates the effective distance of a pc relative jump/call. */
908 avr_relative_distance_considering_wrap_around (unsigned int distance)
910 unsigned int wrap_around_mask = avr_pc_wrap_around - 1;
911 int dist_with_wrap_around = distance & wrap_around_mask;
913 if (dist_with_wrap_around >= ((int) (avr_pc_wrap_around >> 1)))
914 dist_with_wrap_around -= avr_pc_wrap_around;
916 return dist_with_wrap_around;
920 static reloc_howto_type *
921 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
922 bfd_reloc_code_real_type code)
927 i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
929 if (avr_reloc_map[i].bfd_reloc_val == code)
930 return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
935 static reloc_howto_type *
936 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
942 i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]);
944 if (elf_avr_howto_table[i].name != NULL
945 && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0)
946 return &elf_avr_howto_table[i];
951 /* Set the howto pointer for an AVR ELF reloc. */
954 avr_info_to_howto_rela (bfd *abfd,
956 Elf_Internal_Rela *dst)
960 r_type = ELF32_R_TYPE (dst->r_info);
961 if (r_type >= (unsigned int) R_AVR_max)
963 /* xgettext:c-format */
964 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
966 bfd_set_error (bfd_error_bad_value);
969 cache_ptr->howto = &elf_avr_howto_table[r_type];
974 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
976 return (relocation >= 0x020000);
979 /* Returns the address of the corresponding stub if there is one.
980 Returns otherwise an address above 0x020000. This function
981 could also be used, if there is no knowledge on the section where
982 the destination is found. */
985 avr_get_stub_addr (bfd_vma srel,
986 struct elf32_avr_link_hash_table *htab)
989 bfd_vma stub_sec_addr =
990 (htab->stub_sec->output_section->vma +
991 htab->stub_sec->output_offset);
993 for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
994 if (htab->amt_destination_addr[sindex] == srel)
995 return htab->amt_stub_offsets[sindex] + stub_sec_addr;
997 /* Return an address that could not be reached by 16 bit relocs. */
1001 /* Perform a diff relocation. Nothing to do, as the difference value is already
1002 written into the section's contents. */
1004 static bfd_reloc_status_type
1005 bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
1006 arelent *reloc_entry ATTRIBUTE_UNUSED,
1007 asymbol *symbol ATTRIBUTE_UNUSED,
1008 void *data ATTRIBUTE_UNUSED,
1009 asection *input_section ATTRIBUTE_UNUSED,
1010 bfd *output_bfd ATTRIBUTE_UNUSED,
1011 char **error_message ATTRIBUTE_UNUSED)
1013 return bfd_reloc_ok;
1017 /* Perform a single relocation. By default we use the standard BFD
1018 routines, but a few relocs, we have to do them ourselves. */
1020 static bfd_reloc_status_type
1021 avr_final_link_relocate (reloc_howto_type * howto,
1023 asection * input_section,
1024 bfd_byte * contents,
1025 Elf_Internal_Rela * rel,
1027 struct elf32_avr_link_hash_table * htab)
1029 bfd_reloc_status_type r = bfd_reloc_ok;
1031 bfd_signed_vma srel;
1032 bfd_signed_vma reloc_addr;
1033 bfd_boolean use_stubs = FALSE;
1034 /* Usually is 0, unless we are generating code for a bootloader. */
1035 bfd_signed_vma base_addr = htab->vector_base;
1037 /* Absolute addr of the reloc in the final excecutable. */
1038 reloc_addr = rel->r_offset + input_section->output_section->vma
1039 + input_section->output_offset;
1041 switch (howto->type)
1044 contents += rel->r_offset;
1045 srel = (bfd_signed_vma) relocation;
1046 srel += rel->r_addend;
1047 srel -= rel->r_offset;
1048 srel -= 2; /* Branch instructions add 2 to the PC... */
1049 srel -= (input_section->output_section->vma +
1050 input_section->output_offset);
1053 return bfd_reloc_outofrange;
1054 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
1055 return bfd_reloc_overflow;
1056 x = bfd_get_16 (input_bfd, contents);
1057 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
1058 bfd_put_16 (input_bfd, x, contents);
1061 case R_AVR_13_PCREL:
1062 contents += rel->r_offset;
1063 srel = (bfd_signed_vma) relocation;
1064 srel += rel->r_addend;
1065 srel -= rel->r_offset;
1066 srel -= 2; /* Branch instructions add 2 to the PC... */
1067 srel -= (input_section->output_section->vma +
1068 input_section->output_offset);
1071 return bfd_reloc_outofrange;
1073 srel = avr_relative_distance_considering_wrap_around (srel);
1075 /* AVR addresses commands as words. */
1078 /* Check for overflow. */
1079 if (srel < -2048 || srel > 2047)
1081 /* Relative distance is too large. */
1083 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1084 switch (bfd_get_mach (input_bfd))
1087 case bfd_mach_avr25:
1092 return bfd_reloc_overflow;
1096 x = bfd_get_16 (input_bfd, contents);
1097 x = (x & 0xf000) | (srel & 0xfff);
1098 bfd_put_16 (input_bfd, x, contents);
1102 contents += rel->r_offset;
1103 srel = (bfd_signed_vma) relocation + rel->r_addend;
1104 x = bfd_get_16 (input_bfd, contents);
1105 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1106 bfd_put_16 (input_bfd, x, contents);
1110 contents += rel->r_offset;
1111 srel = (bfd_signed_vma) relocation + rel->r_addend;
1112 if (((srel > 0) && (srel & 0xffff) > 255)
1113 || ((srel < 0) && ((-srel) & 0xffff) > 128))
1114 /* Remove offset for data/eeprom section. */
1115 return bfd_reloc_overflow;
1117 x = bfd_get_16 (input_bfd, contents);
1118 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1119 bfd_put_16 (input_bfd, x, contents);
1123 contents += rel->r_offset;
1124 srel = (bfd_signed_vma) relocation + rel->r_addend;
1125 if (((srel & 0xffff) > 63) || (srel < 0))
1126 /* Remove offset for data/eeprom section. */
1127 return bfd_reloc_overflow;
1128 x = bfd_get_16 (input_bfd, contents);
1129 x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
1130 | ((srel & (1 << 5)) << 8));
1131 bfd_put_16 (input_bfd, x, contents);
1135 contents += rel->r_offset;
1136 srel = (bfd_signed_vma) relocation + rel->r_addend;
1137 if (((srel & 0xffff) > 63) || (srel < 0))
1138 /* Remove offset for data/eeprom section. */
1139 return bfd_reloc_overflow;
1140 x = bfd_get_16 (input_bfd, contents);
1141 x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
1142 bfd_put_16 (input_bfd, x, contents);
1146 contents += rel->r_offset;
1147 srel = (bfd_signed_vma) relocation + rel->r_addend;
1148 srel = (srel >> 8) & 0xff;
1149 x = bfd_get_16 (input_bfd, contents);
1150 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1151 bfd_put_16 (input_bfd, x, contents);
1155 contents += rel->r_offset;
1156 srel = (bfd_signed_vma) relocation + rel->r_addend;
1157 srel = (srel >> 16) & 0xff;
1158 x = bfd_get_16 (input_bfd, contents);
1159 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1160 bfd_put_16 (input_bfd, x, contents);
1164 contents += rel->r_offset;
1165 srel = (bfd_signed_vma) relocation + rel->r_addend;
1166 srel = (srel >> 24) & 0xff;
1167 x = bfd_get_16 (input_bfd, contents);
1168 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1169 bfd_put_16 (input_bfd, x, contents);
1172 case R_AVR_LO8_LDI_NEG:
1173 contents += rel->r_offset;
1174 srel = (bfd_signed_vma) relocation + rel->r_addend;
1176 x = bfd_get_16 (input_bfd, contents);
1177 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1178 bfd_put_16 (input_bfd, x, contents);
1181 case R_AVR_HI8_LDI_NEG:
1182 contents += rel->r_offset;
1183 srel = (bfd_signed_vma) relocation + rel->r_addend;
1185 srel = (srel >> 8) & 0xff;
1186 x = bfd_get_16 (input_bfd, contents);
1187 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1188 bfd_put_16 (input_bfd, x, contents);
1191 case R_AVR_HH8_LDI_NEG:
1192 contents += rel->r_offset;
1193 srel = (bfd_signed_vma) relocation + rel->r_addend;
1195 srel = (srel >> 16) & 0xff;
1196 x = bfd_get_16 (input_bfd, contents);
1197 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1198 bfd_put_16 (input_bfd, x, contents);
1201 case R_AVR_MS8_LDI_NEG:
1202 contents += rel->r_offset;
1203 srel = (bfd_signed_vma) relocation + rel->r_addend;
1205 srel = (srel >> 24) & 0xff;
1206 x = bfd_get_16 (input_bfd, contents);
1207 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1208 bfd_put_16 (input_bfd, x, contents);
1211 case R_AVR_LO8_LDI_GS:
1212 use_stubs = (!htab->no_stubs);
1214 case R_AVR_LO8_LDI_PM:
1215 contents += rel->r_offset;
1216 srel = (bfd_signed_vma) relocation + rel->r_addend;
1219 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1221 bfd_vma old_srel = srel;
1223 /* We need to use the address of the stub instead. */
1224 srel = avr_get_stub_addr (srel, htab);
1226 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1227 "reloc at address 0x%x.\n",
1228 (unsigned int) srel,
1229 (unsigned int) old_srel,
1230 (unsigned int) reloc_addr);
1232 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1233 return bfd_reloc_outofrange;
1237 return bfd_reloc_outofrange;
1239 x = bfd_get_16 (input_bfd, contents);
1240 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1241 bfd_put_16 (input_bfd, x, contents);
1244 case R_AVR_HI8_LDI_GS:
1245 use_stubs = (!htab->no_stubs);
1247 case R_AVR_HI8_LDI_PM:
1248 contents += rel->r_offset;
1249 srel = (bfd_signed_vma) relocation + rel->r_addend;
1252 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1254 bfd_vma old_srel = srel;
1256 /* We need to use the address of the stub instead. */
1257 srel = avr_get_stub_addr (srel, htab);
1259 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1260 "reloc at address 0x%x.\n",
1261 (unsigned int) srel,
1262 (unsigned int) old_srel,
1263 (unsigned int) reloc_addr);
1265 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1266 return bfd_reloc_outofrange;
1270 return bfd_reloc_outofrange;
1272 srel = (srel >> 8) & 0xff;
1273 x = bfd_get_16 (input_bfd, contents);
1274 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1275 bfd_put_16 (input_bfd, x, contents);
1278 case R_AVR_HH8_LDI_PM:
1279 contents += rel->r_offset;
1280 srel = (bfd_signed_vma) relocation + rel->r_addend;
1282 return bfd_reloc_outofrange;
1284 srel = (srel >> 16) & 0xff;
1285 x = bfd_get_16 (input_bfd, contents);
1286 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1287 bfd_put_16 (input_bfd, x, contents);
1290 case R_AVR_LO8_LDI_PM_NEG:
1291 contents += rel->r_offset;
1292 srel = (bfd_signed_vma) relocation + rel->r_addend;
1295 return bfd_reloc_outofrange;
1297 x = bfd_get_16 (input_bfd, contents);
1298 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1299 bfd_put_16 (input_bfd, x, contents);
1302 case R_AVR_HI8_LDI_PM_NEG:
1303 contents += rel->r_offset;
1304 srel = (bfd_signed_vma) relocation + rel->r_addend;
1307 return bfd_reloc_outofrange;
1309 srel = (srel >> 8) & 0xff;
1310 x = bfd_get_16 (input_bfd, contents);
1311 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1312 bfd_put_16 (input_bfd, x, contents);
1315 case R_AVR_HH8_LDI_PM_NEG:
1316 contents += rel->r_offset;
1317 srel = (bfd_signed_vma) relocation + rel->r_addend;
1320 return bfd_reloc_outofrange;
1322 srel = (srel >> 16) & 0xff;
1323 x = bfd_get_16 (input_bfd, contents);
1324 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1325 bfd_put_16 (input_bfd, x, contents);
1329 contents += rel->r_offset;
1330 srel = (bfd_signed_vma) relocation + rel->r_addend;
1332 return bfd_reloc_outofrange;
1334 x = bfd_get_16 (input_bfd, contents);
1335 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
1336 bfd_put_16 (input_bfd, x, contents);
1337 bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
1341 use_stubs = (!htab->no_stubs);
1342 contents += rel->r_offset;
1343 srel = (bfd_signed_vma) relocation + rel->r_addend;
1346 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1348 bfd_vma old_srel = srel;
1350 /* We need to use the address of the stub instead. */
1351 srel = avr_get_stub_addr (srel,htab);
1353 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1354 "reloc at address 0x%x.\n",
1355 (unsigned int) srel,
1356 (unsigned int) old_srel,
1357 (unsigned int) reloc_addr);
1359 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1360 return bfd_reloc_outofrange;
1364 return bfd_reloc_outofrange;
1366 bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
1372 /* Nothing to do here, as contents already contains the diff value. */
1376 case R_AVR_LDS_STS_16:
1377 contents += rel->r_offset;
1378 srel = (bfd_signed_vma) relocation + rel->r_addend;
1379 if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
1380 return bfd_reloc_outofrange;
1382 x = bfd_get_16 (input_bfd, contents);
1383 x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
1384 bfd_put_16 (input_bfd, x, contents);
1388 contents += rel->r_offset;
1389 srel = (bfd_signed_vma) relocation + rel->r_addend;
1390 if ((srel & 0xffff) > 0x3f)
1391 return bfd_reloc_outofrange;
1392 x = bfd_get_16 (input_bfd, contents);
1393 x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
1394 bfd_put_16 (input_bfd, x, contents);
1398 contents += rel->r_offset;
1399 srel = (bfd_signed_vma) relocation + rel->r_addend;
1400 if ((srel & 0xffff) > 0x1f)
1401 return bfd_reloc_outofrange;
1402 x = bfd_get_16 (input_bfd, contents);
1403 x = (x & 0xff07) | ((srel & 0x1f) << 3);
1404 bfd_put_16 (input_bfd, x, contents);
1408 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1409 contents, rel->r_offset,
1410 relocation, rel->r_addend);
1416 /* Relocate an AVR ELF section. */
1419 elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1420 struct bfd_link_info *info,
1422 asection *input_section,
1424 Elf_Internal_Rela *relocs,
1425 Elf_Internal_Sym *local_syms,
1426 asection **local_sections)
1428 Elf_Internal_Shdr * symtab_hdr;
1429 struct elf_link_hash_entry ** sym_hashes;
1430 Elf_Internal_Rela * rel;
1431 Elf_Internal_Rela * relend;
1432 struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
1437 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1438 sym_hashes = elf_sym_hashes (input_bfd);
1439 relend = relocs + input_section->reloc_count;
1441 for (rel = relocs; rel < relend; rel ++)
1443 reloc_howto_type * howto;
1444 unsigned long r_symndx;
1445 Elf_Internal_Sym * sym;
1447 struct elf_link_hash_entry * h;
1449 bfd_reloc_status_type r;
1453 r_type = ELF32_R_TYPE (rel->r_info);
1454 r_symndx = ELF32_R_SYM (rel->r_info);
1455 howto = elf_avr_howto_table + r_type;
1460 if (r_symndx < symtab_hdr->sh_info)
1462 sym = local_syms + r_symndx;
1463 sec = local_sections [r_symndx];
1464 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1466 name = bfd_elf_string_from_elf_section
1467 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1468 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
1472 bfd_boolean unresolved_reloc, warned, ignored;
1474 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1475 r_symndx, symtab_hdr, sym_hashes,
1477 unresolved_reloc, warned, ignored);
1479 name = h->root.root.string;
1482 if (sec != NULL && discarded_section (sec))
1483 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1484 rel, 1, relend, howto, 0, contents);
1486 if (bfd_link_relocatable (info))
1489 r = avr_final_link_relocate (howto, input_bfd, input_section,
1490 contents, rel, relocation, htab);
1492 if (r != bfd_reloc_ok)
1494 const char * msg = (const char *) NULL;
1498 case bfd_reloc_overflow:
1499 (*info->callbacks->reloc_overflow)
1500 (info, (h ? &h->root : NULL), name, howto->name,
1501 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1504 case bfd_reloc_undefined:
1505 (*info->callbacks->undefined_symbol)
1506 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1509 case bfd_reloc_outofrange:
1510 msg = _("internal error: out of range error");
1513 case bfd_reloc_notsupported:
1514 msg = _("internal error: unsupported relocation error");
1517 case bfd_reloc_dangerous:
1518 msg = _("internal error: dangerous relocation");
1522 msg = _("internal error: unknown error");
1527 (*info->callbacks->warning) (info, msg, name, input_bfd,
1528 input_section, rel->r_offset);
1535 /* The final processing done just before writing out a AVR ELF object
1536 file. This gets the AVR architecture right based on the machine
1540 bfd_elf_avr_final_write_processing (bfd *abfd,
1541 bfd_boolean linker ATTRIBUTE_UNUSED)
1545 switch (bfd_get_mach (abfd))
1549 val = E_AVR_MACH_AVR2;
1553 val = E_AVR_MACH_AVR1;
1556 case bfd_mach_avr25:
1557 val = E_AVR_MACH_AVR25;
1561 val = E_AVR_MACH_AVR3;
1564 case bfd_mach_avr31:
1565 val = E_AVR_MACH_AVR31;
1568 case bfd_mach_avr35:
1569 val = E_AVR_MACH_AVR35;
1573 val = E_AVR_MACH_AVR4;
1577 val = E_AVR_MACH_AVR5;
1580 case bfd_mach_avr51:
1581 val = E_AVR_MACH_AVR51;
1585 val = E_AVR_MACH_AVR6;
1588 case bfd_mach_avrxmega1:
1589 val = E_AVR_MACH_XMEGA1;
1592 case bfd_mach_avrxmega2:
1593 val = E_AVR_MACH_XMEGA2;
1596 case bfd_mach_avrxmega3:
1597 val = E_AVR_MACH_XMEGA3;
1600 case bfd_mach_avrxmega4:
1601 val = E_AVR_MACH_XMEGA4;
1604 case bfd_mach_avrxmega5:
1605 val = E_AVR_MACH_XMEGA5;
1608 case bfd_mach_avrxmega6:
1609 val = E_AVR_MACH_XMEGA6;
1612 case bfd_mach_avrxmega7:
1613 val = E_AVR_MACH_XMEGA7;
1616 case bfd_mach_avrtiny:
1617 val = E_AVR_MACH_AVRTINY;
1621 elf_elfheader (abfd)->e_machine = EM_AVR;
1622 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
1623 elf_elfheader (abfd)->e_flags |= val;
1626 /* Set the right machine number. */
1629 elf32_avr_object_p (bfd *abfd)
1631 unsigned int e_set = bfd_mach_avr2;
1633 if (elf_elfheader (abfd)->e_machine == EM_AVR
1634 || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
1636 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
1641 case E_AVR_MACH_AVR2:
1642 e_set = bfd_mach_avr2;
1645 case E_AVR_MACH_AVR1:
1646 e_set = bfd_mach_avr1;
1649 case E_AVR_MACH_AVR25:
1650 e_set = bfd_mach_avr25;
1653 case E_AVR_MACH_AVR3:
1654 e_set = bfd_mach_avr3;
1657 case E_AVR_MACH_AVR31:
1658 e_set = bfd_mach_avr31;
1661 case E_AVR_MACH_AVR35:
1662 e_set = bfd_mach_avr35;
1665 case E_AVR_MACH_AVR4:
1666 e_set = bfd_mach_avr4;
1669 case E_AVR_MACH_AVR5:
1670 e_set = bfd_mach_avr5;
1673 case E_AVR_MACH_AVR51:
1674 e_set = bfd_mach_avr51;
1677 case E_AVR_MACH_AVR6:
1678 e_set = bfd_mach_avr6;
1681 case E_AVR_MACH_XMEGA1:
1682 e_set = bfd_mach_avrxmega1;
1685 case E_AVR_MACH_XMEGA2:
1686 e_set = bfd_mach_avrxmega2;
1689 case E_AVR_MACH_XMEGA3:
1690 e_set = bfd_mach_avrxmega3;
1693 case E_AVR_MACH_XMEGA4:
1694 e_set = bfd_mach_avrxmega4;
1697 case E_AVR_MACH_XMEGA5:
1698 e_set = bfd_mach_avrxmega5;
1701 case E_AVR_MACH_XMEGA6:
1702 e_set = bfd_mach_avrxmega6;
1705 case E_AVR_MACH_XMEGA7:
1706 e_set = bfd_mach_avrxmega7;
1709 case E_AVR_MACH_AVRTINY:
1710 e_set = bfd_mach_avrtiny;
1714 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
1718 /* Returns whether the relocation type passed is a diff reloc. */
1721 elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
1723 return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
1724 ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
1725 || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
1728 /* Reduce the diff value written in the section by count if the shrinked
1729 insn address happens to fall between the two symbols for which this
1730 diff reloc was emitted. */
1733 elf32_avr_adjust_diff_reloc_value (bfd *abfd,
1734 struct bfd_section *isec,
1735 Elf_Internal_Rela *irel,
1737 bfd_vma shrinked_insn_address,
1740 unsigned char *reloc_contents = NULL;
1741 unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
1742 if (isec_contents == NULL)
1744 if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
1747 elf_section_data (isec)->this_hdr.contents = isec_contents;
1750 reloc_contents = isec_contents + irel->r_offset;
1752 /* Read value written in object file. */
1753 bfd_signed_vma x = 0;
1754 switch (ELF32_R_TYPE (irel->r_info))
1758 x = bfd_get_signed_8 (abfd, reloc_contents);
1763 x = bfd_get_signed_16 (abfd, reloc_contents);
1768 x = bfd_get_signed_32 (abfd, reloc_contents);
1777 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1778 into the object file at the reloc offset. sym2's logical value is
1779 symval (<start_of_section>) + reloc addend. Compute the start and end
1780 addresses and check if the shrinked insn falls between sym1 and sym2. */
1782 bfd_vma sym2_address = symval + irel->r_addend;
1783 bfd_vma sym1_address = sym2_address - x;
1785 /* Don't assume sym2 is bigger than sym1 - the difference
1786 could be negative. Compute start and end addresses, and
1787 use those to see if they span shrinked_insn_address. */
1789 bfd_vma start_address = sym1_address < sym2_address
1790 ? sym1_address : sym2_address;
1791 bfd_vma end_address = sym1_address > sym2_address
1792 ? sym1_address : sym2_address;
1795 if (shrinked_insn_address >= start_address
1796 && shrinked_insn_address < end_address)
1798 /* Reduce the diff value by count bytes and write it back into section
1800 bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
1802 if (sym2_address > shrinked_insn_address)
1803 irel->r_addend -= count;
1805 switch (ELF32_R_TYPE (irel->r_info))
1809 bfd_put_signed_8 (abfd, new_diff, reloc_contents);
1814 bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents);
1819 bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
1832 elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd,
1834 Elf_Internal_Rela *irel, bfd_vma symval,
1835 bfd_vma shrinked_insn_address,
1836 bfd_vma shrink_boundary,
1840 if (elf32_avr_is_diff_reloc (irel))
1842 elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
1844 shrinked_insn_address,
1849 bfd_vma reloc_value = symval + irel->r_addend;
1850 bfd_boolean addend_within_shrink_boundary =
1851 (reloc_value <= shrink_boundary);
1853 bfd_boolean reloc_spans_insn =
1854 (symval <= shrinked_insn_address
1855 && reloc_value > shrinked_insn_address
1856 && addend_within_shrink_boundary);
1858 if (! reloc_spans_insn)
1861 irel->r_addend -= count;
1864 printf ("Relocation's addend needed to be fixed \n");
1869 avr_should_move_sym (symvalue symval,
1872 bfd_boolean did_pad)
1874 bfd_boolean sym_within_boundary =
1875 did_pad ? symval < end : symval <= end;
1876 return (symval > start && sym_within_boundary);
1880 avr_should_reduce_sym_size (symvalue symval,
1884 bfd_boolean did_pad)
1886 bfd_boolean sym_end_within_boundary =
1887 did_pad ? symend < end : symend <= end;
1888 return (symval <= start && symend > start && sym_end_within_boundary);
1892 avr_should_increase_sym_size (symvalue symval,
1896 bfd_boolean did_pad)
1898 return avr_should_move_sym (symval, start, end, did_pad)
1899 && symend >= end && did_pad;
1902 /* Delete some bytes from a section while changing the size of an instruction.
1903 The parameter "addr" denotes the section-relative offset pointing just
1904 behind the shrinked instruction. "addr+count" point at the first
1905 byte just behind the original unshrinked instruction. If delete_shrinks_insn
1906 is FALSE, we are deleting redundant padding bytes from relax_info prop
1907 record handling. In that case, addr is section-relative offset of start
1908 of padding, and count is the number of padding bytes to delete. */
1911 elf32_avr_relax_delete_bytes (bfd *abfd,
1915 bfd_boolean delete_shrinks_insn)
1917 Elf_Internal_Shdr *symtab_hdr;
1918 unsigned int sec_shndx;
1920 Elf_Internal_Rela *irel, *irelend;
1921 Elf_Internal_Sym *isym;
1922 Elf_Internal_Sym *isymbuf = NULL;
1924 struct elf_link_hash_entry **sym_hashes;
1925 struct elf_link_hash_entry **end_hashes;
1926 unsigned int symcount;
1927 struct avr_relax_info *relax_info;
1928 struct avr_property_record *prop_record = NULL;
1929 bfd_boolean did_shrink = FALSE;
1930 bfd_boolean did_pad = FALSE;
1932 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1933 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1934 contents = elf_section_data (sec)->this_hdr.contents;
1935 relax_info = get_avr_relax_info (sec);
1939 if (relax_info->records.count > 0)
1941 /* There should be no property record within the range of deleted
1942 bytes, however, there might be a property record for ADDR, this is
1943 how we handle alignment directives.
1944 Find the next (if any) property record after the deleted bytes. */
1947 for (i = 0; i < relax_info->records.count; ++i)
1949 bfd_vma offset = relax_info->records.items [i].offset;
1951 BFD_ASSERT (offset <= addr || offset >= (addr + count));
1952 if (offset >= (addr + count))
1954 prop_record = &relax_info->records.items [i];
1961 irel = elf_section_data (sec)->relocs;
1962 irelend = irel + sec->reloc_count;
1964 /* Actually delete the bytes. */
1965 if (toaddr - addr - count > 0)
1967 memmove (contents + addr, contents + addr + count,
1968 (size_t) (toaddr - addr - count));
1971 if (prop_record == NULL)
1978 /* Use the property record to fill in the bytes we've opened up. */
1980 switch (prop_record->type)
1982 case RECORD_ORG_AND_FILL:
1983 fill = prop_record->data.org.fill;
1987 case RECORD_ALIGN_AND_FILL:
1988 fill = prop_record->data.align.fill;
1991 prop_record->data.align.preceding_deleted += count;
1994 /* If toaddr == (addr + count), then we didn't delete anything, yet
1995 we fill count bytes backwards from toaddr. This is still ok - we
1996 end up overwriting the bytes we would have deleted. We just need
1997 to remember we didn't delete anything i.e. don't set did_shrink,
1998 so that we don't corrupt reloc offsets or symbol values.*/
1999 memset (contents + toaddr - count, fill, count);
2006 /* Adjust all the reloc addresses. */
2007 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
2009 bfd_vma old_reloc_address;
2011 old_reloc_address = (sec->output_section->vma
2012 + sec->output_offset + irel->r_offset);
2014 /* Get the new reloc address. */
2015 if ((irel->r_offset > addr
2016 && irel->r_offset < toaddr))
2019 printf ("Relocation at address 0x%x needs to be moved.\n"
2020 "Old section offset: 0x%x, New section offset: 0x%x \n",
2021 (unsigned int) old_reloc_address,
2022 (unsigned int) irel->r_offset,
2023 (unsigned int) ((irel->r_offset) - count));
2025 irel->r_offset -= count;
2030 /* The reloc's own addresses are now ok. However, we need to readjust
2031 the reloc's addend, i.e. the reloc's value if two conditions are met:
2032 1.) the reloc is relative to a symbol in this section that
2033 is located in front of the shrinked instruction
2034 2.) symbol plus addend end up behind the shrinked instruction.
2036 The most common case where this happens are relocs relative to
2037 the section-start symbol.
2039 This step needs to be done for all of the sections of the bfd. */
2042 struct bfd_section *isec;
2044 for (isec = abfd->sections; isec; isec = isec->next)
2047 bfd_vma shrinked_insn_address;
2049 if (isec->reloc_count == 0)
2052 shrinked_insn_address = (sec->output_section->vma
2053 + sec->output_offset + addr);
2054 if (delete_shrinks_insn)
2055 shrinked_insn_address -= count;
2057 irel = elf_section_data (isec)->relocs;
2058 /* PR 12161: Read in the relocs for this section if necessary. */
2060 irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2062 for (irelend = irel + isec->reloc_count;
2066 /* Read this BFD's local symbols if we haven't done
2068 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2070 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2071 if (isymbuf == NULL)
2072 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2073 symtab_hdr->sh_info, 0,
2075 if (isymbuf == NULL)
2079 /* Get the value of the symbol referred to by the reloc. */
2080 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2082 /* A local symbol. */
2085 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2086 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2087 symval = isym->st_value;
2088 /* If the reloc is absolute, it will not have
2089 a symbol or section associated with it. */
2092 /* If there is an alignment boundary, we only need to
2093 adjust addends that end up below the boundary. */
2094 bfd_vma shrink_boundary = (toaddr
2095 + sec->output_section->vma
2096 + sec->output_offset);
2098 symval += sym_sec->output_section->vma
2099 + sym_sec->output_offset;
2102 printf ("Checking if the relocation's "
2103 "addend needs corrections.\n"
2104 "Address of anchor symbol: 0x%x \n"
2105 "Address of relocation target: 0x%x \n"
2106 "Address of relaxed insn: 0x%x \n",
2107 (unsigned int) symval,
2108 (unsigned int) (symval + irel->r_addend),
2109 (unsigned int) shrinked_insn_address);
2111 elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel,
2113 shrinked_insn_address,
2117 /* else...Reference symbol is absolute. No adjustment needed. */
2119 /* else...Reference symbol is extern. No need for adjusting
2125 /* Adjust the local symbols defined in this section. */
2126 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2127 /* Fix PR 9841, there may be no local symbols. */
2130 Elf_Internal_Sym *isymend;
2132 isymend = isym + symtab_hdr->sh_info;
2133 for (; isym < isymend; isym++)
2135 if (isym->st_shndx == sec_shndx)
2137 symvalue symval = isym->st_value;
2138 symvalue symend = symval + isym->st_size;
2139 if (avr_should_reduce_sym_size (symval, symend,
2140 addr, toaddr, did_pad))
2142 /* If this assert fires then we have a symbol that ends
2143 part way through an instruction. Does that make
2145 BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
2146 isym->st_size -= count;
2148 else if (avr_should_increase_sym_size (symval, symend,
2149 addr, toaddr, did_pad))
2150 isym->st_size += count;
2152 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2153 isym->st_value -= count;
2158 /* Now adjust the global symbols defined in this section. */
2159 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2160 - symtab_hdr->sh_info);
2161 sym_hashes = elf_sym_hashes (abfd);
2162 end_hashes = sym_hashes + symcount;
2163 for (; sym_hashes < end_hashes; sym_hashes++)
2165 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2166 if ((sym_hash->root.type == bfd_link_hash_defined
2167 || sym_hash->root.type == bfd_link_hash_defweak)
2168 && sym_hash->root.u.def.section == sec)
2170 symvalue symval = sym_hash->root.u.def.value;
2171 symvalue symend = symval + sym_hash->size;
2173 if (avr_should_reduce_sym_size (symval, symend,
2174 addr, toaddr, did_pad))
2176 /* If this assert fires then we have a symbol that ends
2177 part way through an instruction. Does that make
2179 BFD_ASSERT (symend >= addr + count);
2180 sym_hash->size -= count;
2182 else if (avr_should_increase_sym_size (symval, symend,
2183 addr, toaddr, did_pad))
2184 sym_hash->size += count;
2186 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2187 sym_hash->root.u.def.value -= count;
2194 static Elf_Internal_Sym *
2195 retrieve_local_syms (bfd *input_bfd)
2197 Elf_Internal_Shdr *symtab_hdr;
2198 Elf_Internal_Sym *isymbuf;
2201 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2202 locsymcount = symtab_hdr->sh_info;
2204 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2205 if (isymbuf == NULL && locsymcount != 0)
2206 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
2209 /* Save the symbols for this input file so they won't be read again. */
2210 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
2211 symtab_hdr->contents = (unsigned char *) isymbuf;
2216 /* Get the input section for a given symbol index.
2218 . a section symbol, return the section;
2219 . a common symbol, return the common section;
2220 . an undefined symbol, return the undefined section;
2221 . an indirect symbol, follow the links;
2222 . an absolute value, return the absolute section. */
2225 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
2227 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2228 asection *target_sec = NULL;
2229 if (r_symndx < symtab_hdr->sh_info)
2231 Elf_Internal_Sym *isymbuf;
2232 unsigned int section_index;
2234 isymbuf = retrieve_local_syms (abfd);
2235 section_index = isymbuf[r_symndx].st_shndx;
2237 if (section_index == SHN_UNDEF)
2238 target_sec = bfd_und_section_ptr;
2239 else if (section_index == SHN_ABS)
2240 target_sec = bfd_abs_section_ptr;
2241 else if (section_index == SHN_COMMON)
2242 target_sec = bfd_com_section_ptr;
2244 target_sec = bfd_section_from_elf_index (abfd, section_index);
2248 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2249 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
2251 while (h->root.type == bfd_link_hash_indirect
2252 || h->root.type == bfd_link_hash_warning)
2253 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2255 switch (h->root.type)
2257 case bfd_link_hash_defined:
2258 case bfd_link_hash_defweak:
2259 target_sec = h->root.u.def.section;
2261 case bfd_link_hash_common:
2262 target_sec = bfd_com_section_ptr;
2264 case bfd_link_hash_undefined:
2265 case bfd_link_hash_undefweak:
2266 target_sec = bfd_und_section_ptr;
2268 default: /* New indirect warning. */
2269 target_sec = bfd_und_section_ptr;
2276 /* Get the section-relative offset for a symbol number. */
2279 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
2281 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2284 if (r_symndx < symtab_hdr->sh_info)
2286 Elf_Internal_Sym *isymbuf;
2287 isymbuf = retrieve_local_syms (abfd);
2288 offset = isymbuf[r_symndx].st_value;
2292 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2293 struct elf_link_hash_entry *h =
2294 elf_sym_hashes (abfd)[indx];
2296 while (h->root.type == bfd_link_hash_indirect
2297 || h->root.type == bfd_link_hash_warning)
2298 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2299 if (h->root.type == bfd_link_hash_defined
2300 || h->root.type == bfd_link_hash_defweak)
2301 offset = h->root.u.def.value;
2306 /* Iterate over the property records in R_LIST, and copy each record into
2307 the list of records within the relaxation information for the section to
2308 which the record applies. */
2311 avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
2315 for (i = 0; i < r_list->record_count; ++i)
2317 struct avr_relax_info *relax_info;
2319 relax_info = get_avr_relax_info (r_list->records [i].section);
2320 BFD_ASSERT (relax_info != NULL);
2322 if (relax_info->records.count
2323 == relax_info->records.allocated)
2325 /* Allocate more space. */
2328 relax_info->records.allocated += 10;
2329 size = (sizeof (struct avr_property_record)
2330 * relax_info->records.allocated);
2331 relax_info->records.items
2332 = bfd_realloc (relax_info->records.items, size);
2335 memcpy (&relax_info->records.items [relax_info->records.count],
2336 &r_list->records [i],
2337 sizeof (struct avr_property_record));
2338 relax_info->records.count++;
2342 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2343 ordering callback from QSORT. */
2346 avr_property_record_compare (const void *ap, const void *bp)
2348 const struct avr_property_record *a
2349 = (struct avr_property_record *) ap;
2350 const struct avr_property_record *b
2351 = (struct avr_property_record *) bp;
2353 if (a->offset != b->offset)
2354 return (a->offset - b->offset);
2356 if (a->section != b->section)
2357 return (bfd_get_section_vma (a->section->owner, a->section)
2358 - bfd_get_section_vma (b->section->owner, b->section));
2360 return (a->type - b->type);
2363 /* Load all of the avr property sections from all of the bfd objects
2364 referenced from LINK_INFO. All of the records within each property
2365 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2366 specific data of the appropriate section. */
2369 avr_load_all_property_sections (struct bfd_link_info *link_info)
2374 /* Initialize the per-section relaxation info. */
2375 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2376 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2378 init_avr_relax_info (sec);
2381 /* Load the descriptor tables from .avr.prop sections. */
2382 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2384 struct avr_property_record_list *r_list;
2386 r_list = avr_elf32_load_property_records (abfd);
2388 avr_elf32_assign_records_to_sections (r_list);
2393 /* Now, for every section, ensure that the descriptor list in the
2394 relaxation data is sorted by ascending offset within the section. */
2395 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2396 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2398 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
2399 if (relax_info && relax_info->records.count > 0)
2403 qsort (relax_info->records.items,
2404 relax_info->records.count,
2405 sizeof (struct avr_property_record),
2406 avr_property_record_compare);
2408 /* For debug purposes, list all the descriptors. */
2409 for (i = 0; i < relax_info->records.count; ++i)
2411 switch (relax_info->records.items [i].type)
2415 case RECORD_ORG_AND_FILL:
2419 case RECORD_ALIGN_AND_FILL:
2427 /* This function handles relaxing for the avr.
2428 Many important relaxing opportunities within functions are already
2429 realized by the compiler itself.
2430 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2431 and jump -> rjmp (safes also 2 bytes).
2432 As well we now optimize seqences of
2433 - call/rcall function
2438 . In case that within a sequence
2441 the ret could no longer be reached it is optimized away. In order
2442 to check if the ret is no longer needed, it is checked that the ret's address
2443 is not the target of a branch or jump within the same section, it is checked
2444 that there is no skip instruction before the jmp/rjmp and that there
2445 is no local or global label place at the address of the ret.
2447 We refrain from relaxing within sections ".vectors" and
2448 ".jumptables" in order to maintain the position of the instructions.
2449 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2450 if possible. (In future one could possibly use the space of the nop
2451 for the first instruction of the irq service function.
2453 The .jumptables sections is meant to be used for a future tablejump variant
2454 for the devices with 3-byte program counter where the table itself
2455 contains 4-byte jump instructions whose relative offset must not
2459 elf32_avr_relax_section (bfd *abfd,
2461 struct bfd_link_info *link_info,
2464 Elf_Internal_Shdr *symtab_hdr;
2465 Elf_Internal_Rela *internal_relocs;
2466 Elf_Internal_Rela *irel, *irelend;
2467 bfd_byte *contents = NULL;
2468 Elf_Internal_Sym *isymbuf = NULL;
2469 struct elf32_avr_link_hash_table *htab;
2470 static bfd_boolean relaxation_initialised = FALSE;
2472 if (!relaxation_initialised)
2474 relaxation_initialised = TRUE;
2476 /* Load entries from the .avr.prop sections. */
2477 avr_load_all_property_sections (link_info);
2480 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2481 relaxing. Such shrinking can cause issues for the sections such
2482 as .vectors and .jumptables. Instead the unused bytes should be
2483 filled with nop instructions. */
2484 bfd_boolean shrinkable = TRUE;
2486 if (!strcmp (sec->name,".vectors")
2487 || !strcmp (sec->name,".jumptables"))
2490 if (bfd_link_relocatable (link_info))
2491 (*link_info->callbacks->einfo)
2492 (_("%P%F: --relax and -r may not be used together\n"));
2494 htab = avr_link_hash_table (link_info);
2498 /* Assume nothing changes. */
2501 if ((!htab->no_stubs) && (sec == htab->stub_sec))
2503 /* We are just relaxing the stub section.
2504 Let's calculate the size needed again. */
2505 bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
2508 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2509 (int) last_estimated_stub_section_size);
2511 elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
2514 /* Check if the number of trampolines changed. */
2515 if (last_estimated_stub_section_size != htab->stub_sec->size)
2519 printf ("Size of stub section after this pass: %i\n",
2520 (int) htab->stub_sec->size);
2525 /* We don't have to do anything for a relocatable link, if
2526 this section does not have relocs, or if this is not a
2528 if (bfd_link_relocatable (link_info)
2529 || (sec->flags & SEC_RELOC) == 0
2530 || sec->reloc_count == 0
2531 || (sec->flags & SEC_CODE) == 0)
2534 /* Check if the object file to relax uses internal symbols so that we
2535 could fix up the relocations. */
2536 if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
2539 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2541 /* Get a copy of the native relocations. */
2542 internal_relocs = (_bfd_elf_link_read_relocs
2543 (abfd, sec, NULL, NULL, link_info->keep_memory));
2544 if (internal_relocs == NULL)
2547 /* Walk through the relocs looking for relaxing opportunities. */
2548 irelend = internal_relocs + sec->reloc_count;
2549 for (irel = internal_relocs; irel < irelend; irel++)
2553 if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
2554 && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
2555 && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
2558 /* Get the section contents if we haven't done so already. */
2559 if (contents == NULL)
2561 /* Get cached copy if it exists. */
2562 if (elf_section_data (sec)->this_hdr.contents != NULL)
2563 contents = elf_section_data (sec)->this_hdr.contents;
2566 /* Go get them off disk. */
2567 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2572 /* Read this BFD's local symbols if we haven't done so already. */
2573 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2575 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2576 if (isymbuf == NULL)
2577 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2578 symtab_hdr->sh_info, 0,
2580 if (isymbuf == NULL)
2585 /* Get the value of the symbol referred to by the reloc. */
2586 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2588 /* A local symbol. */
2589 Elf_Internal_Sym *isym;
2592 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2593 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2594 symval = isym->st_value;
2595 /* If the reloc is absolute, it will not have
2596 a symbol or section associated with it. */
2598 symval += sym_sec->output_section->vma
2599 + sym_sec->output_offset;
2604 struct elf_link_hash_entry *h;
2606 /* An external symbol. */
2607 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2608 h = elf_sym_hashes (abfd)[indx];
2609 BFD_ASSERT (h != NULL);
2610 if (h->root.type != bfd_link_hash_defined
2611 && h->root.type != bfd_link_hash_defweak)
2612 /* This appears to be a reference to an undefined
2613 symbol. Just ignore it--it will be caught by the
2614 regular reloc processing. */
2617 symval = (h->root.u.def.value
2618 + h->root.u.def.section->output_section->vma
2619 + h->root.u.def.section->output_offset);
2622 /* For simplicity of coding, we are going to modify the section
2623 contents, the section relocs, and the BFD symbol table. We
2624 must tell the rest of the code not to free up this
2625 information. It would be possible to instead create a table
2626 of changes which have to be made, as is done in coff-mips.c;
2627 that would be more work, but would require less memory when
2628 the linker is run. */
2629 switch (ELF32_R_TYPE (irel->r_info))
2631 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2632 pc-relative rcall/rjmp. */
2635 bfd_vma value = symval + irel->r_addend;
2637 int distance_short_enough = 0;
2639 /* Get the address of this instruction. */
2640 dot = (sec->output_section->vma
2641 + sec->output_offset + irel->r_offset);
2643 /* Compute the distance from this insn to the branch target. */
2646 /* The ISA manual states that addressable range is PC - 2k + 1 to
2647 PC + 2k. In bytes, that would be -4094 <= PC <= 4096. The range
2648 is shifted one word to the right, because pc-relative instructions
2649 implicitly add one word i.e. rjmp 0 jumps to next insn, not the
2651 Therefore, for the !shrinkable case, the range is as above.
2652 If shrinkable, then the current code only deletes bytes 3 and
2653 4 of the absolute call/jmp, so the forward jump range increases
2654 by 2 bytes, but the backward (negative) jump range remains
2658 /* Check if the gap falls in the range that can be accommodated
2659 in 13bits signed (It is 12bits when encoded, as we deal with
2660 word addressing). */
2661 if (!shrinkable && ((int) gap >= -4094 && (int) gap <= 4096))
2662 distance_short_enough = 1;
2663 /* If shrinkable, then we can check for a range of distance which
2664 is two bytes farther on the positive direction because the call
2665 or jump target will be closer by two bytes after the
2667 else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4098))
2668 distance_short_enough = 1;
2670 /* Here we handle the wrap-around case. E.g. for a 16k device
2671 we could use a rjmp to jump from address 0x100 to 0x3d00!
2672 In order to make this work properly, we need to fill the
2673 vaiable avr_pc_wrap_around with the appropriate value.
2674 I.e. 0x4000 for a 16k device. */
2676 /* Shrinking the code size makes the gaps larger in the
2677 case of wrap-arounds. So we use a heuristical safety
2678 margin to avoid that during relax the distance gets
2679 again too large for the short jumps. Let's assume
2680 a typical code-size reduction due to relax for a
2681 16k device of 600 bytes. So let's use twice the
2682 typical value as safety margin. */
2686 int assumed_shrink = 600;
2687 if (avr_pc_wrap_around > 0x4000)
2688 assumed_shrink = 900;
2690 safety_margin = 2 * assumed_shrink;
2692 rgap = avr_relative_distance_considering_wrap_around (gap);
2694 if (rgap >= (-4092 + safety_margin)
2695 && rgap <= (4094 - safety_margin))
2696 distance_short_enough = 1;
2699 if (distance_short_enough)
2701 unsigned char code_msb;
2702 unsigned char code_lsb;
2705 printf ("shrinking jump/call instruction at address 0x%x"
2706 " in section %s\n\n",
2707 (int) dot, sec->name);
2709 /* Note that we've changed the relocs, section contents,
2711 elf_section_data (sec)->relocs = internal_relocs;
2712 elf_section_data (sec)->this_hdr.contents = contents;
2713 symtab_hdr->contents = (unsigned char *) isymbuf;
2715 /* Get the instruction code for relaxing. */
2716 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
2717 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2719 /* Mask out the relocation bits. */
2722 if (code_msb == 0x94 && code_lsb == 0x0E)
2724 /* we are changing call -> rcall . */
2725 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2726 bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
2728 else if (code_msb == 0x94 && code_lsb == 0x0C)
2730 /* we are changeing jump -> rjmp. */
2731 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2732 bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
2737 /* Fix the relocation's type. */
2738 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2741 /* We should not modify the ordering if 'shrinkable' is
2745 /* Let's insert a nop. */
2746 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
2747 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
2751 /* Delete two bytes of data. */
2752 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2753 irel->r_offset + 2, 2,
2757 /* That will change things, so, we should relax again.
2758 Note that this is not required, and it may be slow. */
2767 unsigned char code_msb;
2768 unsigned char code_lsb;
2771 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2772 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
2774 /* Get the address of this instruction. */
2775 dot = (sec->output_section->vma
2776 + sec->output_offset + irel->r_offset);
2778 /* Here we look for rcall/ret or call/ret sequences that could be
2779 safely replaced by rjmp/ret or jmp/ret. */
2780 if (((code_msb & 0xf0) == 0xd0)
2781 && avr_replace_call_ret_sequences)
2783 /* This insn is a rcall. */
2784 unsigned char next_insn_msb = 0;
2785 unsigned char next_insn_lsb = 0;
2787 if (irel->r_offset + 3 < sec->size)
2790 bfd_get_8 (abfd, contents + irel->r_offset + 3);
2792 bfd_get_8 (abfd, contents + irel->r_offset + 2);
2795 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2797 /* The next insn is a ret. We now convert the rcall insn
2798 into a rjmp instruction. */
2800 bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
2802 printf ("converted rcall/ret sequence at address 0x%x"
2803 " into rjmp/ret sequence. Section is %s\n\n",
2804 (int) dot, sec->name);
2809 else if ((0x94 == (code_msb & 0xfe))
2810 && (0x0e == (code_lsb & 0x0e))
2811 && avr_replace_call_ret_sequences)
2813 /* This insn is a call. */
2814 unsigned char next_insn_msb = 0;
2815 unsigned char next_insn_lsb = 0;
2817 if (irel->r_offset + 5 < sec->size)
2820 bfd_get_8 (abfd, contents + irel->r_offset + 5);
2822 bfd_get_8 (abfd, contents + irel->r_offset + 4);
2825 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2827 /* The next insn is a ret. We now convert the call insn
2828 into a jmp instruction. */
2831 bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
2833 printf ("converted call/ret sequence at address 0x%x"
2834 " into jmp/ret sequence. Section is %s\n\n",
2835 (int) dot, sec->name);
2840 else if ((0xc0 == (code_msb & 0xf0))
2841 || ((0x94 == (code_msb & 0xfe))
2842 && (0x0c == (code_lsb & 0x0e))))
2844 /* This insn is a rjmp or a jmp. */
2845 unsigned char next_insn_msb = 0;
2846 unsigned char next_insn_lsb = 0;
2849 if (0xc0 == (code_msb & 0xf0))
2850 insn_size = 2; /* rjmp insn */
2852 insn_size = 4; /* jmp insn */
2854 if (irel->r_offset + insn_size + 1 < sec->size)
2857 bfd_get_8 (abfd, contents + irel->r_offset
2860 bfd_get_8 (abfd, contents + irel->r_offset
2864 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2866 /* The next insn is a ret. We possibly could delete
2867 this ret. First we need to check for preceding
2868 sbis/sbic/sbrs or cpse "skip" instructions. */
2870 int there_is_preceding_non_skip_insn = 1;
2871 bfd_vma address_of_ret;
2873 address_of_ret = dot + insn_size;
2875 if (debug_relax && (insn_size == 2))
2876 printf ("found rjmp / ret sequence at address 0x%x\n",
2878 if (debug_relax && (insn_size == 4))
2879 printf ("found jmp / ret sequence at address 0x%x\n",
2882 /* We have to make sure that there is a preceding insn. */
2883 if (irel->r_offset >= 2)
2885 unsigned char preceding_msb;
2886 unsigned char preceding_lsb;
2889 bfd_get_8 (abfd, contents + irel->r_offset - 1);
2891 bfd_get_8 (abfd, contents + irel->r_offset - 2);
2894 if (0x99 == preceding_msb)
2895 there_is_preceding_non_skip_insn = 0;
2898 if (0x9b == preceding_msb)
2899 there_is_preceding_non_skip_insn = 0;
2902 if ((0xfc == (preceding_msb & 0xfe)
2903 && (0x00 == (preceding_lsb & 0x08))))
2904 there_is_preceding_non_skip_insn = 0;
2907 if ((0xfe == (preceding_msb & 0xfe)
2908 && (0x00 == (preceding_lsb & 0x08))))
2909 there_is_preceding_non_skip_insn = 0;
2912 if (0x10 == (preceding_msb & 0xfc))
2913 there_is_preceding_non_skip_insn = 0;
2915 if (there_is_preceding_non_skip_insn == 0)
2917 printf ("preceding skip insn prevents deletion of"
2918 " ret insn at Addy 0x%x in section %s\n",
2919 (int) dot + 2, sec->name);
2923 /* There is no previous instruction. */
2924 there_is_preceding_non_skip_insn = 0;
2927 if (there_is_preceding_non_skip_insn)
2929 /* We now only have to make sure that there is no
2930 local label defined at the address of the ret
2931 instruction and that there is no local relocation
2932 in this section pointing to the ret. */
2934 int deleting_ret_is_safe = 1;
2935 unsigned int section_offset_of_ret_insn =
2936 irel->r_offset + insn_size;
2937 Elf_Internal_Sym *isym, *isymend;
2938 unsigned int sec_shndx;
2939 struct bfd_section *isec;
2942 _bfd_elf_section_from_bfd_section (abfd, sec);
2944 /* Check for local symbols. */
2945 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2946 isymend = isym + symtab_hdr->sh_info;
2947 /* PR 6019: There may not be any local symbols. */
2948 for (; isym != NULL && isym < isymend; isym++)
2950 if (isym->st_value == section_offset_of_ret_insn
2951 && isym->st_shndx == sec_shndx)
2953 deleting_ret_is_safe = 0;
2955 printf ("local label prevents deletion of ret "
2956 "insn at address 0x%x\n",
2957 (int) dot + insn_size);
2961 /* Now check for global symbols. */
2964 struct elf_link_hash_entry **sym_hashes;
2965 struct elf_link_hash_entry **end_hashes;
2967 symcount = (symtab_hdr->sh_size
2968 / sizeof (Elf32_External_Sym)
2969 - symtab_hdr->sh_info);
2970 sym_hashes = elf_sym_hashes (abfd);
2971 end_hashes = sym_hashes + symcount;
2972 for (; sym_hashes < end_hashes; sym_hashes++)
2974 struct elf_link_hash_entry *sym_hash =
2976 if ((sym_hash->root.type == bfd_link_hash_defined
2977 || sym_hash->root.type ==
2978 bfd_link_hash_defweak)
2979 && sym_hash->root.u.def.section == sec
2980 && sym_hash->root.u.def.value == section_offset_of_ret_insn)
2982 deleting_ret_is_safe = 0;
2984 printf ("global label prevents deletion of "
2985 "ret insn at address 0x%x\n",
2986 (int) dot + insn_size);
2991 /* Now we check for relocations pointing to ret. */
2992 for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
2994 Elf_Internal_Rela *rel;
2995 Elf_Internal_Rela *relend;
2997 rel = elf_section_data (isec)->relocs;
2999 rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
3001 relend = rel + isec->reloc_count;
3003 for (; rel && rel < relend; rel++)
3005 bfd_vma reloc_target = 0;
3007 /* Read this BFD's local symbols if we haven't
3009 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
3011 isymbuf = (Elf_Internal_Sym *)
3012 symtab_hdr->contents;
3013 if (isymbuf == NULL)
3014 isymbuf = bfd_elf_get_elf_syms
3017 symtab_hdr->sh_info, 0,
3019 if (isymbuf == NULL)
3023 /* Get the value of the symbol referred to
3025 if (ELF32_R_SYM (rel->r_info)
3026 < symtab_hdr->sh_info)
3028 /* A local symbol. */
3032 + ELF32_R_SYM (rel->r_info);
3033 sym_sec = bfd_section_from_elf_index
3034 (abfd, isym->st_shndx);
3035 symval = isym->st_value;
3037 /* If the reloc is absolute, it will not
3038 have a symbol or section associated
3044 sym_sec->output_section->vma
3045 + sym_sec->output_offset;
3046 reloc_target = symval + rel->r_addend;
3050 reloc_target = symval + rel->r_addend;
3051 /* Reference symbol is absolute. */
3054 /* else ... reference symbol is extern. */
3056 if (address_of_ret == reloc_target)
3058 deleting_ret_is_safe = 0;
3061 "rjmp/jmp ret sequence at address"
3062 " 0x%x could not be deleted. ret"
3063 " is target of a relocation.\n",
3064 (int) address_of_ret);
3070 if (deleting_ret_is_safe)
3073 printf ("unreachable ret instruction "
3074 "at address 0x%x deleted.\n",
3075 (int) dot + insn_size);
3077 /* Delete two bytes of data. */
3078 if (!elf32_avr_relax_delete_bytes (abfd, sec,
3079 irel->r_offset + insn_size, 2,
3083 /* That will change things, so, we should relax
3084 again. Note that this is not required, and it
3099 /* Look through all the property records in this section to see if
3100 there's any alignment records that can be moved. */
3101 struct avr_relax_info *relax_info;
3103 relax_info = get_avr_relax_info (sec);
3104 if (relax_info->records.count > 0)
3108 for (i = 0; i < relax_info->records.count; ++i)
3110 switch (relax_info->records.items [i].type)
3113 case RECORD_ORG_AND_FILL:
3116 case RECORD_ALIGN_AND_FILL:
3118 struct avr_property_record *record;
3119 unsigned long bytes_to_align;
3122 /* Look for alignment directives that have had enough
3123 bytes deleted before them, such that the directive
3124 can be moved backwards and still maintain the
3125 required alignment. */
3126 record = &relax_info->records.items [i];
3128 = (unsigned long) (1 << record->data.align.bytes);
3129 while (record->data.align.preceding_deleted >=
3132 record->data.align.preceding_deleted
3134 count += bytes_to_align;
3139 bfd_vma addr = record->offset;
3141 /* We can delete COUNT bytes and this alignment
3142 directive will still be correctly aligned.
3143 First move the alignment directive, then delete
3145 record->offset -= count;
3146 elf32_avr_relax_delete_bytes (abfd, sec,
3158 if (contents != NULL
3159 && elf_section_data (sec)->this_hdr.contents != contents)
3161 if (! link_info->keep_memory)
3165 /* Cache the section contents for elf_link_input_bfd. */
3166 elf_section_data (sec)->this_hdr.contents = contents;
3170 if (internal_relocs != NULL
3171 && elf_section_data (sec)->relocs != internal_relocs)
3172 free (internal_relocs);
3178 && symtab_hdr->contents != (unsigned char *) isymbuf)
3180 if (contents != NULL
3181 && elf_section_data (sec)->this_hdr.contents != contents)
3183 if (internal_relocs != NULL
3184 && elf_section_data (sec)->relocs != internal_relocs)
3185 free (internal_relocs);
3190 /* This is a version of bfd_generic_get_relocated_section_contents
3191 which uses elf32_avr_relocate_section.
3193 For avr it's essentially a cut and paste taken from the H8300 port.
3194 The author of the relaxation support patch for avr had absolutely no
3195 clue what is happening here but found out that this part of the code
3196 seems to be important. */
3199 elf32_avr_get_relocated_section_contents (bfd *output_bfd,
3200 struct bfd_link_info *link_info,
3201 struct bfd_link_order *link_order,
3203 bfd_boolean relocatable,
3206 Elf_Internal_Shdr *symtab_hdr;
3207 asection *input_section = link_order->u.indirect.section;
3208 bfd *input_bfd = input_section->owner;
3209 asection **sections = NULL;
3210 Elf_Internal_Rela *internal_relocs = NULL;
3211 Elf_Internal_Sym *isymbuf = NULL;
3213 /* We only need to handle the case of relaxing, or of having a
3214 particular set of section contents, specially. */
3216 || elf_section_data (input_section)->this_hdr.contents == NULL)
3217 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3221 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3223 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3224 (size_t) input_section->size);
3226 if ((input_section->flags & SEC_RELOC) != 0
3227 && input_section->reloc_count > 0)
3230 Elf_Internal_Sym *isym, *isymend;
3233 internal_relocs = (_bfd_elf_link_read_relocs
3234 (input_bfd, input_section, NULL, NULL, FALSE));
3235 if (internal_relocs == NULL)
3238 if (symtab_hdr->sh_info != 0)
3240 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3241 if (isymbuf == NULL)
3242 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3243 symtab_hdr->sh_info, 0,
3245 if (isymbuf == NULL)
3249 amt = symtab_hdr->sh_info;
3250 amt *= sizeof (asection *);
3251 sections = bfd_malloc (amt);
3252 if (sections == NULL && amt != 0)
3255 isymend = isymbuf + symtab_hdr->sh_info;
3256 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3260 if (isym->st_shndx == SHN_UNDEF)
3261 isec = bfd_und_section_ptr;
3262 else if (isym->st_shndx == SHN_ABS)
3263 isec = bfd_abs_section_ptr;
3264 else if (isym->st_shndx == SHN_COMMON)
3265 isec = bfd_com_section_ptr;
3267 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3272 if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
3273 input_section, data, internal_relocs,
3277 if (sections != NULL)
3280 && symtab_hdr->contents != (unsigned char *) isymbuf)
3282 if (elf_section_data (input_section)->relocs != internal_relocs)
3283 free (internal_relocs);
3289 if (sections != NULL)
3292 && symtab_hdr->contents != (unsigned char *) isymbuf)
3294 if (internal_relocs != NULL
3295 && elf_section_data (input_section)->relocs != internal_relocs)
3296 free (internal_relocs);
3301 /* Determines the hash entry name for a particular reloc. It consists of
3302 the identifier of the symbol section and the added reloc addend and
3303 symbol offset relative to the section the symbol is attached to. */
3306 avr_stub_name (const asection *symbol_section,
3307 const bfd_vma symbol_offset,
3308 const Elf_Internal_Rela *rela)
3313 len = 8 + 1 + 8 + 1 + 1;
3314 stub_name = bfd_malloc (len);
3315 if (stub_name != NULL)
3316 sprintf (stub_name, "%08x+%08x",
3317 symbol_section->id & 0xffffffff,
3318 (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
3324 /* Add a new stub entry to the stub hash. Not all fields of the new
3325 stub entry are initialised. */
3327 static struct elf32_avr_stub_hash_entry *
3328 avr_add_stub (const char *stub_name,
3329 struct elf32_avr_link_hash_table *htab)
3331 struct elf32_avr_stub_hash_entry *hsh;
3333 /* Enter this entry into the linker stub hash table. */
3334 hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);
3338 /* xgettext:c-format */
3339 _bfd_error_handler (_("cannot create stub entry %s"), stub_name);
3343 hsh->stub_offset = 0;
3347 /* We assume that there is already space allocated for the stub section
3348 contents and that before building the stubs the section size is
3349 initialized to 0. We assume that within the stub hash table entry,
3350 the absolute position of the jmp target has been written in the
3351 target_value field. We write here the offset of the generated jmp insn
3352 relative to the trampoline section start to the stub_offset entry in
3353 the stub hash table entry. */
3356 avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3358 struct elf32_avr_stub_hash_entry *hsh;
3359 struct bfd_link_info *info;
3360 struct elf32_avr_link_hash_table *htab;
3367 bfd_vma jmp_insn = 0x0000940c;
3369 /* Massage our args to the form they really have. */
3370 hsh = avr_stub_hash_entry (bh);
3372 if (!hsh->is_actually_needed)
3375 info = (struct bfd_link_info *) in_arg;
3377 htab = avr_link_hash_table (info);
3381 target = hsh->target_value;
3383 /* Make a note of the offset within the stubs for this entry. */
3384 hsh->stub_offset = htab->stub_sec->size;
3385 loc = htab->stub_sec->contents + hsh->stub_offset;
3387 stub_bfd = htab->stub_sec->owner;
3390 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3391 (unsigned int) target,
3392 (unsigned int) hsh->stub_offset);
3394 /* We now have to add the information on the jump target to the bare
3395 opcode bits already set in jmp_insn. */
3397 /* Check for the alignment of the address. */
3401 starget = target >> 1;
3402 jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
3403 bfd_put_16 (stub_bfd, jmp_insn, loc);
3404 bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
3406 htab->stub_sec->size += 4;
3408 /* Now add the entries in the address mapping table if there is still
3413 nr = htab->amt_entry_cnt + 1;
3414 if (nr <= htab->amt_max_entry_cnt)
3416 htab->amt_entry_cnt = nr;
3418 htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
3419 htab->amt_destination_addr[nr - 1] = target;
3427 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
3428 void *in_arg ATTRIBUTE_UNUSED)
3430 struct elf32_avr_stub_hash_entry *hsh;
3432 hsh = avr_stub_hash_entry (bh);
3433 hsh->is_actually_needed = FALSE;
3439 avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3441 struct elf32_avr_stub_hash_entry *hsh;
3442 struct elf32_avr_link_hash_table *htab;
3445 /* Massage our args to the form they really have. */
3446 hsh = avr_stub_hash_entry (bh);
3449 if (hsh->is_actually_needed)
3454 htab->stub_sec->size += size;
3459 elf32_avr_setup_params (struct bfd_link_info *info,
3461 asection *avr_stub_section,
3462 bfd_boolean no_stubs,
3463 bfd_boolean deb_stubs,
3464 bfd_boolean deb_relax,
3465 bfd_vma pc_wrap_around,
3466 bfd_boolean call_ret_replacement)
3468 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3472 htab->stub_sec = avr_stub_section;
3473 htab->stub_bfd = avr_stub_bfd;
3474 htab->no_stubs = no_stubs;
3476 debug_relax = deb_relax;
3477 debug_stubs = deb_stubs;
3478 avr_pc_wrap_around = pc_wrap_around;
3479 avr_replace_call_ret_sequences = call_ret_replacement;
3483 /* Set up various things so that we can make a list of input sections
3484 for each output section included in the link. Returns -1 on error,
3485 0 when no stubs will be needed, and 1 on success. It also sets
3486 information on the stubs bfd and the stub section in the info
3490 elf32_avr_setup_section_lists (bfd *output_bfd,
3491 struct bfd_link_info *info)
3494 unsigned int bfd_count;
3495 unsigned int top_id, top_index;
3497 asection **input_list, **list;
3499 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3501 if (htab == NULL || htab->no_stubs)
3504 /* Count the number of input BFDs and find the top input section id. */
3505 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3507 input_bfd = input_bfd->link.next)
3510 for (section = input_bfd->sections;
3512 section = section->next)
3513 if (top_id < section->id)
3514 top_id = section->id;
3517 htab->bfd_count = bfd_count;
3519 /* We can't use output_bfd->section_count here to find the top output
3520 section index as some sections may have been removed, and
3521 strip_excluded_output_sections doesn't renumber the indices. */
3522 for (section = output_bfd->sections, top_index = 0;
3524 section = section->next)
3525 if (top_index < section->index)
3526 top_index = section->index;
3528 htab->top_index = top_index;
3529 amt = sizeof (asection *) * (top_index + 1);
3530 input_list = bfd_malloc (amt);
3531 htab->input_list = input_list;
3532 if (input_list == NULL)
3535 /* For sections we aren't interested in, mark their entries with a
3536 value we can check later. */
3537 list = input_list + top_index;
3539 *list = bfd_abs_section_ptr;
3540 while (list-- != input_list);
3542 for (section = output_bfd->sections;
3544 section = section->next)
3545 if ((section->flags & SEC_CODE) != 0)
3546 input_list[section->index] = NULL;
3552 /* Read in all local syms for all input bfds, and create hash entries
3553 for export stubs if we are building a multi-subspace shared lib.
3554 Returns -1 on error, 0 otherwise. */
3557 get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
3559 unsigned int bfd_indx;
3560 Elf_Internal_Sym *local_syms, **all_local_syms;
3561 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3567 /* We want to read in symbol extension records only once. To do this
3568 we need to read in the local symbols in parallel and save them for
3569 later use; so hold pointers to the local symbols in an array. */
3570 amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3571 all_local_syms = bfd_zmalloc (amt);
3572 htab->all_local_syms = all_local_syms;
3573 if (all_local_syms == NULL)
3576 /* Walk over all the input BFDs, swapping in local symbols.
3577 If we are creating a shared library, create hash entries for the
3581 input_bfd = input_bfd->link.next, bfd_indx++)
3583 Elf_Internal_Shdr *symtab_hdr;
3585 /* We'll need the symbol table in a second. */
3586 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3587 if (symtab_hdr->sh_info == 0)
3590 /* We need an array of the local symbols attached to the input bfd. */
3591 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3592 if (local_syms == NULL)
3594 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3595 symtab_hdr->sh_info, 0,
3597 /* Cache them for elf_link_input_bfd. */
3598 symtab_hdr->contents = (unsigned char *) local_syms;
3600 if (local_syms == NULL)
3603 all_local_syms[bfd_indx] = local_syms;
3609 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3612 elf32_avr_size_stubs (bfd *output_bfd,
3613 struct bfd_link_info *info,
3614 bfd_boolean is_prealloc_run)
3616 struct elf32_avr_link_hash_table *htab;
3617 int stub_changed = 0;
3619 htab = avr_link_hash_table (info);
3623 /* At this point we initialize htab->vector_base
3624 To the start of the text output section. */
3625 htab->vector_base = htab->stub_sec->output_section->vma;
3627 if (get_local_syms (info->input_bfds, info))
3629 if (htab->all_local_syms)
3630 goto error_ret_free_local;
3634 if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
3636 struct elf32_avr_stub_hash_entry *test;
3638 test = avr_add_stub ("Hugo",htab);
3639 test->target_value = 0x123456;
3640 test->stub_offset = 13;
3642 test = avr_add_stub ("Hugo2",htab);
3643 test->target_value = 0x84210;
3644 test->stub_offset = 14;
3650 unsigned int bfd_indx;
3652 /* We will have to re-generate the stub hash table each time anything
3653 in memory has changed. */
3655 bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
3656 for (input_bfd = info->input_bfds, bfd_indx = 0;
3658 input_bfd = input_bfd->link.next, bfd_indx++)
3660 Elf_Internal_Shdr *symtab_hdr;
3662 Elf_Internal_Sym *local_syms;
3664 /* We'll need the symbol table in a second. */
3665 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3666 if (symtab_hdr->sh_info == 0)
3669 local_syms = htab->all_local_syms[bfd_indx];
3671 /* Walk over each section attached to the input bfd. */
3672 for (section = input_bfd->sections;
3674 section = section->next)
3676 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3678 /* If there aren't any relocs, then there's nothing more
3680 if ((section->flags & SEC_RELOC) == 0
3681 || section->reloc_count == 0)
3684 /* If this section is a link-once section that will be
3685 discarded, then don't create any stubs. */
3686 if (section->output_section == NULL
3687 || section->output_section->owner != output_bfd)
3690 /* Get the relocs. */
3692 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3694 if (internal_relocs == NULL)
3695 goto error_ret_free_local;
3697 /* Now examine each relocation. */
3698 irela = internal_relocs;
3699 irelaend = irela + section->reloc_count;
3700 for (; irela < irelaend; irela++)
3702 unsigned int r_type, r_indx;
3703 struct elf32_avr_stub_hash_entry *hsh;
3706 bfd_vma destination;
3707 struct elf_link_hash_entry *hh;
3710 r_type = ELF32_R_TYPE (irela->r_info);
3711 r_indx = ELF32_R_SYM (irela->r_info);
3713 /* Only look for 16 bit GS relocs. No other reloc will need a
3715 if (!((r_type == R_AVR_16_PM)
3716 || (r_type == R_AVR_LO8_LDI_GS)
3717 || (r_type == R_AVR_HI8_LDI_GS)))
3720 /* Now determine the call target, its name, value,
3726 if (r_indx < symtab_hdr->sh_info)
3728 /* It's a local symbol. */
3729 Elf_Internal_Sym *sym;
3730 Elf_Internal_Shdr *hdr;
3733 sym = local_syms + r_indx;
3734 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3735 sym_value = sym->st_value;
3736 shndx = sym->st_shndx;
3737 if (shndx < elf_numsections (input_bfd))
3739 hdr = elf_elfsections (input_bfd)[shndx];
3740 sym_sec = hdr->bfd_section;
3741 destination = (sym_value + irela->r_addend
3742 + sym_sec->output_offset
3743 + sym_sec->output_section->vma);
3748 /* It's an external symbol. */
3751 e_indx = r_indx - symtab_hdr->sh_info;
3752 hh = elf_sym_hashes (input_bfd)[e_indx];
3754 while (hh->root.type == bfd_link_hash_indirect
3755 || hh->root.type == bfd_link_hash_warning)
3756 hh = (struct elf_link_hash_entry *)
3757 (hh->root.u.i.link);
3759 if (hh->root.type == bfd_link_hash_defined
3760 || hh->root.type == bfd_link_hash_defweak)
3762 sym_sec = hh->root.u.def.section;
3763 sym_value = hh->root.u.def.value;
3764 if (sym_sec->output_section != NULL)
3765 destination = (sym_value + irela->r_addend
3766 + sym_sec->output_offset
3767 + sym_sec->output_section->vma);
3769 else if (hh->root.type == bfd_link_hash_undefweak)
3771 if (! bfd_link_pic (info))
3774 else if (hh->root.type == bfd_link_hash_undefined)
3776 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3777 && (ELF_ST_VISIBILITY (hh->other)
3783 bfd_set_error (bfd_error_bad_value);
3785 error_ret_free_internal:
3786 if (elf_section_data (section)->relocs == NULL)
3787 free (internal_relocs);
3788 goto error_ret_free_local;
3792 if (! avr_stub_is_required_for_16_bit_reloc
3793 (destination - htab->vector_base))
3795 if (!is_prealloc_run)
3796 /* We are having a reloc that does't need a stub. */
3799 /* We don't right now know if a stub will be needed.
3800 Let's rather be on the safe side. */
3803 /* Get the name of this stub. */
3804 stub_name = avr_stub_name (sym_sec, sym_value, irela);
3807 goto error_ret_free_internal;
3810 hsh = avr_stub_hash_lookup (&htab->bstab,
3815 /* The proper stub has already been created. Mark it
3816 to be used and write the possibly changed destination
3818 hsh->is_actually_needed = TRUE;
3819 hsh->target_value = destination;
3824 hsh = avr_add_stub (stub_name, htab);
3828 goto error_ret_free_internal;
3831 hsh->is_actually_needed = TRUE;
3832 hsh->target_value = destination;
3835 printf ("Adding stub with destination 0x%x to the"
3836 " hash table.\n", (unsigned int) destination);
3838 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
3840 stub_changed = TRUE;
3843 /* We're done with the internal relocs, free them. */
3844 if (elf_section_data (section)->relocs == NULL)
3845 free (internal_relocs);
3849 /* Re-Calculate the number of needed stubs. */
3850 htab->stub_sec->size = 0;
3851 bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
3856 stub_changed = FALSE;
3859 free (htab->all_local_syms);
3862 error_ret_free_local:
3863 free (htab->all_local_syms);
3868 /* Build all the stubs associated with the current output file. The
3869 stubs are kept in a hash table attached to the main linker hash
3870 table. We also set up the .plt entries for statically linked PIC
3871 functions here. This function is called via hppaelf_finish in the
3875 elf32_avr_build_stubs (struct bfd_link_info *info)
3878 struct bfd_hash_table *table;
3879 struct elf32_avr_link_hash_table *htab;
3880 bfd_size_type total_size = 0;
3882 htab = avr_link_hash_table (info);
3886 /* In case that there were several stub sections: */
3887 for (stub_sec = htab->stub_bfd->sections;
3889 stub_sec = stub_sec->next)
3893 /* Allocate memory to hold the linker stubs. */
3894 size = stub_sec->size;
3897 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3898 if (stub_sec->contents == NULL && size != 0)
3903 /* Allocate memory for the adress mapping table. */
3904 htab->amt_entry_cnt = 0;
3905 htab->amt_max_entry_cnt = total_size / 4;
3906 htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
3907 * htab->amt_max_entry_cnt);
3908 htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
3909 * htab->amt_max_entry_cnt );
3912 printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
3914 /* Build the stubs as directed by the stub hash table. */
3915 table = &htab->bstab;
3916 bfd_hash_traverse (table, avr_build_one_stub, info);
3919 printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
3924 /* Callback used by QSORT to order relocations AP and BP. */
3927 internal_reloc_compare (const void *ap, const void *bp)
3929 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
3930 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
3932 if (a->r_offset != b->r_offset)
3933 return (a->r_offset - b->r_offset);
3935 /* We don't need to sort on these criteria for correctness,
3936 but enforcing a more strict ordering prevents unstable qsort
3937 from behaving differently with different implementations.
3938 Without the code below we get correct but different results
3939 on Solaris 2.7 and 2.8. We would like to always produce the
3940 same results no matter the host. */
3942 if (a->r_info != b->r_info)
3943 return (a->r_info - b->r_info);
3945 return (a->r_addend - b->r_addend);
3948 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3951 avr_is_section_for_address (bfd *abfd, asection *section, bfd_vma address)
3956 vma = bfd_get_section_vma (abfd, section);
3960 size = section->size;
3961 if (address >= vma + size)
3967 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3969 struct avr_find_section_data
3971 /* The address we're looking for. */
3974 /* The section we've found. */
3978 /* Helper function to locate the section holding a certain virtual memory
3979 address. This is called via bfd_map_over_sections. The DATA is an
3980 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3981 has been set to the address to search for, and the section field has
3982 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3983 section field in DATA will be set to SECTION. As an optimisation, if
3984 the section field is already non-null then this function does not
3985 perform any checks, and just returns. */
3988 avr_find_section_for_address (bfd *abfd,
3989 asection *section, void *data)
3991 struct avr_find_section_data *fs_data
3992 = (struct avr_find_section_data *) data;
3994 /* Return if already found. */
3995 if (fs_data->section != NULL)
3998 /* If this section isn't part of the addressable code content, skip it. */
3999 if ((bfd_get_section_flags (abfd, section) & SEC_ALLOC) == 0
4000 && (bfd_get_section_flags (abfd, section) & SEC_CODE) == 0)
4003 if (avr_is_section_for_address (abfd, section, fs_data->address))
4004 fs_data->section = section;
4007 /* Load all of the property records from SEC, a section from ABFD. Return
4008 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
4009 memory for the returned structure, and all of the records pointed too by
4010 the structure are allocated with a single call to malloc, so, only the
4011 pointer returned needs to be free'd. */
4013 static struct avr_property_record_list *
4014 avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
4016 char *contents = NULL, *ptr;
4017 bfd_size_type size, mem_size;
4018 bfd_byte version, flags;
4019 uint16_t record_count, i;
4020 struct avr_property_record_list *r_list = NULL;
4021 Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
4022 struct avr_find_section_data fs_data;
4024 fs_data.section = NULL;
4026 size = bfd_get_section_size (sec);
4027 contents = bfd_malloc (size);
4028 bfd_get_section_contents (abfd, sec, contents, 0, size);
4031 /* Load the relocations for the '.avr.prop' section if there are any, and
4033 internal_relocs = (_bfd_elf_link_read_relocs
4034 (abfd, sec, NULL, NULL, FALSE));
4035 if (internal_relocs)
4036 qsort (internal_relocs, sec->reloc_count,
4037 sizeof (Elf_Internal_Rela), internal_reloc_compare);
4039 /* There is a header at the start of the property record section SEC, the
4040 format of this header is:
4041 uint8_t : version number
4043 uint16_t : record counter
4046 /* Check we have at least got a headers worth of bytes. */
4047 if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
4050 version = *((bfd_byte *) ptr);
4052 flags = *((bfd_byte *) ptr);
4054 record_count = *((uint16_t *) ptr);
4056 BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
4058 /* Now allocate space for the list structure, and all of the list
4059 elements in a single block. */
4060 mem_size = sizeof (struct avr_property_record_list)
4061 + sizeof (struct avr_property_record) * record_count;
4062 r_list = bfd_malloc (mem_size);
4066 r_list->version = version;
4067 r_list->flags = flags;
4068 r_list->section = sec;
4069 r_list->record_count = record_count;
4070 r_list->records = (struct avr_property_record *) (&r_list [1]);
4071 size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
4073 /* Check that we understand the version number. There is only one
4074 version number right now, anything else is an error. */
4075 if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
4078 rel = internal_relocs;
4079 rel_end = rel + sec->reloc_count;
4080 for (i = 0; i < record_count; ++i)
4084 /* Each entry is a 32-bit address, followed by a single byte type.
4085 After that is the type specific data. We must take care to
4086 ensure that we don't read beyond the end of the section data. */
4090 r_list->records [i].section = NULL;
4091 r_list->records [i].offset = 0;
4095 /* The offset of the address within the .avr.prop section. */
4096 size_t offset = ptr - contents;
4098 while (rel < rel_end && rel->r_offset < offset)
4103 else if (rel->r_offset == offset)
4105 /* Find section and section offset. */
4106 unsigned long r_symndx;
4111 r_symndx = ELF32_R_SYM (rel->r_info);
4112 rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
4113 sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
4116 r_list->records [i].section = rel_sec;
4117 r_list->records [i].offset = sec_offset;
4121 address = *((uint32_t *) ptr);
4125 if (r_list->records [i].section == NULL)
4127 /* Try to find section and offset from address. */
4128 if (fs_data.section != NULL
4129 && !avr_is_section_for_address (abfd, fs_data.section,
4131 fs_data.section = NULL;
4133 if (fs_data.section == NULL)
4135 fs_data.address = address;
4136 bfd_map_over_sections (abfd, avr_find_section_for_address,
4140 if (fs_data.section == NULL)
4142 fprintf (stderr, "Failed to find matching section.\n");
4146 r_list->records [i].section = fs_data.section;
4147 r_list->records [i].offset
4148 = address - bfd_get_section_vma (abfd, fs_data.section);
4151 r_list->records [i].type = *((bfd_byte *) ptr);
4155 switch (r_list->records [i].type)
4158 /* Nothing else to load. */
4160 case RECORD_ORG_AND_FILL:
4161 /* Just a 4-byte fill to load. */
4164 r_list->records [i].data.org.fill = *((uint32_t *) ptr);
4169 /* Just a 4-byte alignment to load. */
4172 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4175 /* Just initialise PRECEDING_DELETED field, this field is
4176 used during linker relaxation. */
4177 r_list->records [i].data.align.preceding_deleted = 0;
4179 case RECORD_ALIGN_AND_FILL:
4180 /* A 4-byte alignment, and a 4-byte fill to load. */
4183 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4185 r_list->records [i].data.align.fill = *((uint32_t *) ptr);
4188 /* Just initialise PRECEDING_DELETED field, this field is
4189 used during linker relaxation. */
4190 r_list->records [i].data.align.preceding_deleted = 0;
4198 if (elf_section_data (sec)->relocs != internal_relocs)
4199 free (internal_relocs);
4203 if (elf_section_data (sec)->relocs != internal_relocs)
4204 free (internal_relocs);
4210 /* Load all of the property records from ABFD. See
4211 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4213 struct avr_property_record_list *
4214 avr_elf32_load_property_records (bfd *abfd)
4218 /* Find the '.avr.prop' section and load the contents into memory. */
4219 sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
4222 return avr_elf32_load_records_from_section (abfd, sec);
4226 avr_elf32_property_record_name (struct avr_property_record *rec)
4235 case RECORD_ORG_AND_FILL:
4241 case RECORD_ALIGN_AND_FILL:
4252 #define ELF_ARCH bfd_arch_avr
4253 #define ELF_TARGET_ID AVR_ELF_DATA
4254 #define ELF_MACHINE_CODE EM_AVR
4255 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4256 #define ELF_MAXPAGESIZE 1
4258 #define TARGET_LITTLE_SYM avr_elf32_vec
4259 #define TARGET_LITTLE_NAME "elf32-avr"
4261 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4263 #define elf_info_to_howto avr_info_to_howto_rela
4264 #define elf_info_to_howto_rel NULL
4265 #define elf_backend_relocate_section elf32_avr_relocate_section
4266 #define elf_backend_can_gc_sections 1
4267 #define elf_backend_rela_normal 1
4268 #define elf_backend_final_write_processing \
4269 bfd_elf_avr_final_write_processing
4270 #define elf_backend_object_p elf32_avr_object_p
4272 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4273 #define bfd_elf32_bfd_get_relocated_section_contents \
4274 elf32_avr_get_relocated_section_contents
4275 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4276 #define elf_backend_special_sections elf_avr_special_sections
4278 #include "elf32-target.h"