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Fix PR ld/20254
[deliverable/binutils-gdb.git] / bfd / elf32-avr.c
1 /* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999-2016 Free Software Foundation, Inc.
3 Contributed by Denis Chertykov <denisc@overta.ru>
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/avr.h"
27 #include "elf32-avr.h"
28 #include "bfd_stdint.h"
29
30 /* Enable debugging printout at stdout with this variable. */
31 static bfd_boolean debug_relax = FALSE;
32
33 /* Enable debugging printout at stdout with this variable. */
34 static bfd_boolean debug_stubs = FALSE;
35
36 static bfd_reloc_status_type
37 bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *,
38 asection *, bfd *, char **);
39
40 /* Hash table initialization and handling. Code is taken from the hppa port
41 and adapted to the needs of AVR. */
42
43 /* We use two hash tables to hold information for linking avr objects.
44
45 The first is the elf32_avr_link_hash_table which is derived from the
46 stanard ELF linker hash table. We use this as a place to attach the other
47 hash table and some static information.
48
49 The second is the stub hash table which is derived from the base BFD
50 hash table. The stub hash table holds the information on the linker
51 stubs. */
52
53 struct elf32_avr_stub_hash_entry
54 {
55 /* Base hash table entry structure. */
56 struct bfd_hash_entry bh_root;
57
58 /* Offset within stub_sec of the beginning of this stub. */
59 bfd_vma stub_offset;
60
61 /* Given the symbol's value and its section we can determine its final
62 value when building the stubs (so the stub knows where to jump). */
63 bfd_vma target_value;
64
65 /* This way we could mark stubs to be no longer necessary. */
66 bfd_boolean is_actually_needed;
67 };
68
69 struct elf32_avr_link_hash_table
70 {
71 /* The main hash table. */
72 struct elf_link_hash_table etab;
73
74 /* The stub hash table. */
75 struct bfd_hash_table bstab;
76
77 bfd_boolean no_stubs;
78
79 /* Linker stub bfd. */
80 bfd *stub_bfd;
81
82 /* The stub section. */
83 asection *stub_sec;
84
85 /* Usually 0, unless we are generating code for a bootloader. Will
86 be initialized by elf32_avr_size_stubs to the vma offset of the
87 output section associated with the stub section. */
88 bfd_vma vector_base;
89
90 /* Assorted information used by elf32_avr_size_stubs. */
91 unsigned int bfd_count;
92 unsigned int top_index;
93 asection ** input_list;
94 Elf_Internal_Sym ** all_local_syms;
95
96 /* Tables for mapping vma beyond the 128k boundary to the address of the
97 corresponding stub. (AMT)
98 "amt_max_entry_cnt" reflects the number of entries that memory is allocated
99 for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
100 "amt_entry_cnt" informs how many of these entries actually contain
101 useful data. */
102 unsigned int amt_entry_cnt;
103 unsigned int amt_max_entry_cnt;
104 bfd_vma * amt_stub_offsets;
105 bfd_vma * amt_destination_addr;
106 };
107
108 /* Various hash macros and functions. */
109 #define avr_link_hash_table(p) \
110 /* PR 3874: Check that we have an AVR style hash table before using it. */\
111 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
112 == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL)
113
114 #define avr_stub_hash_entry(ent) \
115 ((struct elf32_avr_stub_hash_entry *)(ent))
116
117 #define avr_stub_hash_lookup(table, string, create, copy) \
118 ((struct elf32_avr_stub_hash_entry *) \
119 bfd_hash_lookup ((table), (string), (create), (copy)))
120
121 static reloc_howto_type elf_avr_howto_table[] =
122 {
123 HOWTO (R_AVR_NONE, /* type */
124 0, /* rightshift */
125 3, /* size (0 = byte, 1 = short, 2 = long) */
126 0, /* bitsize */
127 FALSE, /* pc_relative */
128 0, /* bitpos */
129 complain_overflow_dont, /* complain_on_overflow */
130 bfd_elf_generic_reloc, /* special_function */
131 "R_AVR_NONE", /* name */
132 FALSE, /* partial_inplace */
133 0, /* src_mask */
134 0, /* dst_mask */
135 FALSE), /* pcrel_offset */
136
137 HOWTO (R_AVR_32, /* type */
138 0, /* rightshift */
139 2, /* size (0 = byte, 1 = short, 2 = long) */
140 32, /* bitsize */
141 FALSE, /* pc_relative */
142 0, /* bitpos */
143 complain_overflow_bitfield, /* complain_on_overflow */
144 bfd_elf_generic_reloc, /* special_function */
145 "R_AVR_32", /* name */
146 FALSE, /* partial_inplace */
147 0xffffffff, /* src_mask */
148 0xffffffff, /* dst_mask */
149 FALSE), /* pcrel_offset */
150
151 /* A 7 bit PC relative relocation. */
152 HOWTO (R_AVR_7_PCREL, /* type */
153 1, /* rightshift */
154 1, /* size (0 = byte, 1 = short, 2 = long) */
155 7, /* bitsize */
156 TRUE, /* pc_relative */
157 3, /* bitpos */
158 complain_overflow_bitfield, /* complain_on_overflow */
159 bfd_elf_generic_reloc, /* special_function */
160 "R_AVR_7_PCREL", /* name */
161 FALSE, /* partial_inplace */
162 0xffff, /* src_mask */
163 0xffff, /* dst_mask */
164 TRUE), /* pcrel_offset */
165
166 /* A 13 bit PC relative relocation. */
167 HOWTO (R_AVR_13_PCREL, /* type */
168 1, /* rightshift */
169 1, /* size (0 = byte, 1 = short, 2 = long) */
170 13, /* bitsize */
171 TRUE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_bitfield, /* complain_on_overflow */
174 bfd_elf_generic_reloc, /* special_function */
175 "R_AVR_13_PCREL", /* name */
176 FALSE, /* partial_inplace */
177 0xfff, /* src_mask */
178 0xfff, /* dst_mask */
179 TRUE), /* pcrel_offset */
180
181 /* A 16 bit absolute relocation. */
182 HOWTO (R_AVR_16, /* type */
183 0, /* rightshift */
184 1, /* size (0 = byte, 1 = short, 2 = long) */
185 16, /* bitsize */
186 FALSE, /* pc_relative */
187 0, /* bitpos */
188 complain_overflow_dont, /* complain_on_overflow */
189 bfd_elf_generic_reloc, /* special_function */
190 "R_AVR_16", /* name */
191 FALSE, /* partial_inplace */
192 0xffff, /* src_mask */
193 0xffff, /* dst_mask */
194 FALSE), /* pcrel_offset */
195
196 /* A 16 bit absolute relocation for command address
197 Will be changed when linker stubs are needed. */
198 HOWTO (R_AVR_16_PM, /* type */
199 1, /* rightshift */
200 1, /* size (0 = byte, 1 = short, 2 = long) */
201 16, /* bitsize */
202 FALSE, /* pc_relative */
203 0, /* bitpos */
204 complain_overflow_bitfield, /* complain_on_overflow */
205 bfd_elf_generic_reloc, /* special_function */
206 "R_AVR_16_PM", /* name */
207 FALSE, /* partial_inplace */
208 0xffff, /* src_mask */
209 0xffff, /* dst_mask */
210 FALSE), /* pcrel_offset */
211 /* A low 8 bit absolute relocation of 16 bit address.
212 For LDI command. */
213 HOWTO (R_AVR_LO8_LDI, /* type */
214 0, /* rightshift */
215 1, /* size (0 = byte, 1 = short, 2 = long) */
216 8, /* bitsize */
217 FALSE, /* pc_relative */
218 0, /* bitpos */
219 complain_overflow_dont, /* complain_on_overflow */
220 bfd_elf_generic_reloc, /* special_function */
221 "R_AVR_LO8_LDI", /* name */
222 FALSE, /* partial_inplace */
223 0xffff, /* src_mask */
224 0xffff, /* dst_mask */
225 FALSE), /* pcrel_offset */
226 /* A high 8 bit absolute relocation of 16 bit address.
227 For LDI command. */
228 HOWTO (R_AVR_HI8_LDI, /* type */
229 8, /* rightshift */
230 1, /* size (0 = byte, 1 = short, 2 = long) */
231 8, /* bitsize */
232 FALSE, /* pc_relative */
233 0, /* bitpos */
234 complain_overflow_dont, /* complain_on_overflow */
235 bfd_elf_generic_reloc, /* special_function */
236 "R_AVR_HI8_LDI", /* name */
237 FALSE, /* partial_inplace */
238 0xffff, /* src_mask */
239 0xffff, /* dst_mask */
240 FALSE), /* pcrel_offset */
241 /* A high 6 bit absolute relocation of 22 bit address.
242 For LDI command. As well second most significant 8 bit value of
243 a 32 bit link-time constant. */
244 HOWTO (R_AVR_HH8_LDI, /* type */
245 16, /* rightshift */
246 1, /* size (0 = byte, 1 = short, 2 = long) */
247 8, /* bitsize */
248 FALSE, /* pc_relative */
249 0, /* bitpos */
250 complain_overflow_dont, /* complain_on_overflow */
251 bfd_elf_generic_reloc, /* special_function */
252 "R_AVR_HH8_LDI", /* name */
253 FALSE, /* partial_inplace */
254 0xffff, /* src_mask */
255 0xffff, /* dst_mask */
256 FALSE), /* pcrel_offset */
257 /* A negative low 8 bit absolute relocation of 16 bit address.
258 For LDI command. */
259 HOWTO (R_AVR_LO8_LDI_NEG, /* type */
260 0, /* rightshift */
261 1, /* size (0 = byte, 1 = short, 2 = long) */
262 8, /* bitsize */
263 FALSE, /* pc_relative */
264 0, /* bitpos */
265 complain_overflow_dont, /* complain_on_overflow */
266 bfd_elf_generic_reloc, /* special_function */
267 "R_AVR_LO8_LDI_NEG", /* name */
268 FALSE, /* partial_inplace */
269 0xffff, /* src_mask */
270 0xffff, /* dst_mask */
271 FALSE), /* pcrel_offset */
272 /* A negative high 8 bit absolute relocation of 16 bit address.
273 For LDI command. */
274 HOWTO (R_AVR_HI8_LDI_NEG, /* type */
275 8, /* rightshift */
276 1, /* size (0 = byte, 1 = short, 2 = long) */
277 8, /* bitsize */
278 FALSE, /* pc_relative */
279 0, /* bitpos */
280 complain_overflow_dont, /* complain_on_overflow */
281 bfd_elf_generic_reloc, /* special_function */
282 "R_AVR_HI8_LDI_NEG", /* name */
283 FALSE, /* partial_inplace */
284 0xffff, /* src_mask */
285 0xffff, /* dst_mask */
286 FALSE), /* pcrel_offset */
287 /* A negative high 6 bit absolute relocation of 22 bit address.
288 For LDI command. */
289 HOWTO (R_AVR_HH8_LDI_NEG, /* type */
290 16, /* rightshift */
291 1, /* size (0 = byte, 1 = short, 2 = long) */
292 8, /* bitsize */
293 FALSE, /* pc_relative */
294 0, /* bitpos */
295 complain_overflow_dont, /* complain_on_overflow */
296 bfd_elf_generic_reloc, /* special_function */
297 "R_AVR_HH8_LDI_NEG", /* name */
298 FALSE, /* partial_inplace */
299 0xffff, /* src_mask */
300 0xffff, /* dst_mask */
301 FALSE), /* pcrel_offset */
302 /* A low 8 bit absolute relocation of 24 bit program memory address.
303 For LDI command. Will not be changed when linker stubs are needed. */
304 HOWTO (R_AVR_LO8_LDI_PM, /* type */
305 1, /* rightshift */
306 1, /* size (0 = byte, 1 = short, 2 = long) */
307 8, /* bitsize */
308 FALSE, /* pc_relative */
309 0, /* bitpos */
310 complain_overflow_dont, /* complain_on_overflow */
311 bfd_elf_generic_reloc, /* special_function */
312 "R_AVR_LO8_LDI_PM", /* name */
313 FALSE, /* partial_inplace */
314 0xffff, /* src_mask */
315 0xffff, /* dst_mask */
316 FALSE), /* pcrel_offset */
317 /* A low 8 bit absolute relocation of 24 bit program memory address.
318 For LDI command. Will not be changed when linker stubs are needed. */
319 HOWTO (R_AVR_HI8_LDI_PM, /* type */
320 9, /* rightshift */
321 1, /* size (0 = byte, 1 = short, 2 = long) */
322 8, /* bitsize */
323 FALSE, /* pc_relative */
324 0, /* bitpos */
325 complain_overflow_dont, /* complain_on_overflow */
326 bfd_elf_generic_reloc, /* special_function */
327 "R_AVR_HI8_LDI_PM", /* name */
328 FALSE, /* partial_inplace */
329 0xffff, /* src_mask */
330 0xffff, /* dst_mask */
331 FALSE), /* pcrel_offset */
332 /* A low 8 bit absolute relocation of 24 bit program memory address.
333 For LDI command. Will not be changed when linker stubs are needed. */
334 HOWTO (R_AVR_HH8_LDI_PM, /* type */
335 17, /* rightshift */
336 1, /* size (0 = byte, 1 = short, 2 = long) */
337 8, /* bitsize */
338 FALSE, /* pc_relative */
339 0, /* bitpos */
340 complain_overflow_dont, /* complain_on_overflow */
341 bfd_elf_generic_reloc, /* special_function */
342 "R_AVR_HH8_LDI_PM", /* name */
343 FALSE, /* partial_inplace */
344 0xffff, /* src_mask */
345 0xffff, /* dst_mask */
346 FALSE), /* pcrel_offset */
347 /* A low 8 bit absolute relocation of 24 bit program memory address.
348 For LDI command. Will not be changed when linker stubs are needed. */
349 HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */
350 1, /* rightshift */
351 1, /* size (0 = byte, 1 = short, 2 = long) */
352 8, /* bitsize */
353 FALSE, /* pc_relative */
354 0, /* bitpos */
355 complain_overflow_dont, /* complain_on_overflow */
356 bfd_elf_generic_reloc, /* special_function */
357 "R_AVR_LO8_LDI_PM_NEG", /* name */
358 FALSE, /* partial_inplace */
359 0xffff, /* src_mask */
360 0xffff, /* dst_mask */
361 FALSE), /* pcrel_offset */
362 /* A low 8 bit absolute relocation of 24 bit program memory address.
363 For LDI command. Will not be changed when linker stubs are needed. */
364 HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */
365 9, /* rightshift */
366 1, /* size (0 = byte, 1 = short, 2 = long) */
367 8, /* bitsize */
368 FALSE, /* pc_relative */
369 0, /* bitpos */
370 complain_overflow_dont, /* complain_on_overflow */
371 bfd_elf_generic_reloc, /* special_function */
372 "R_AVR_HI8_LDI_PM_NEG", /* name */
373 FALSE, /* partial_inplace */
374 0xffff, /* src_mask */
375 0xffff, /* dst_mask */
376 FALSE), /* pcrel_offset */
377 /* A low 8 bit absolute relocation of 24 bit program memory address.
378 For LDI command. Will not be changed when linker stubs are needed. */
379 HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */
380 17, /* rightshift */
381 1, /* size (0 = byte, 1 = short, 2 = long) */
382 8, /* bitsize */
383 FALSE, /* pc_relative */
384 0, /* bitpos */
385 complain_overflow_dont, /* complain_on_overflow */
386 bfd_elf_generic_reloc, /* special_function */
387 "R_AVR_HH8_LDI_PM_NEG", /* name */
388 FALSE, /* partial_inplace */
389 0xffff, /* src_mask */
390 0xffff, /* dst_mask */
391 FALSE), /* pcrel_offset */
392 /* Relocation for CALL command in ATmega. */
393 HOWTO (R_AVR_CALL, /* type */
394 1, /* rightshift */
395 2, /* size (0 = byte, 1 = short, 2 = long) */
396 23, /* bitsize */
397 FALSE, /* pc_relative */
398 0, /* bitpos */
399 complain_overflow_dont,/* complain_on_overflow */
400 bfd_elf_generic_reloc, /* special_function */
401 "R_AVR_CALL", /* name */
402 FALSE, /* partial_inplace */
403 0xffffffff, /* src_mask */
404 0xffffffff, /* dst_mask */
405 FALSE), /* pcrel_offset */
406 /* A 16 bit absolute relocation of 16 bit address.
407 For LDI command. */
408 HOWTO (R_AVR_LDI, /* type */
409 0, /* rightshift */
410 1, /* size (0 = byte, 1 = short, 2 = long) */
411 16, /* bitsize */
412 FALSE, /* pc_relative */
413 0, /* bitpos */
414 complain_overflow_dont,/* complain_on_overflow */
415 bfd_elf_generic_reloc, /* special_function */
416 "R_AVR_LDI", /* name */
417 FALSE, /* partial_inplace */
418 0xffff, /* src_mask */
419 0xffff, /* dst_mask */
420 FALSE), /* pcrel_offset */
421 /* A 6 bit absolute relocation of 6 bit offset.
422 For ldd/sdd command. */
423 HOWTO (R_AVR_6, /* type */
424 0, /* rightshift */
425 0, /* size (0 = byte, 1 = short, 2 = long) */
426 6, /* bitsize */
427 FALSE, /* pc_relative */
428 0, /* bitpos */
429 complain_overflow_dont,/* complain_on_overflow */
430 bfd_elf_generic_reloc, /* special_function */
431 "R_AVR_6", /* name */
432 FALSE, /* partial_inplace */
433 0xffff, /* src_mask */
434 0xffff, /* dst_mask */
435 FALSE), /* pcrel_offset */
436 /* A 6 bit absolute relocation of 6 bit offset.
437 For sbiw/adiw command. */
438 HOWTO (R_AVR_6_ADIW, /* type */
439 0, /* rightshift */
440 0, /* size (0 = byte, 1 = short, 2 = long) */
441 6, /* bitsize */
442 FALSE, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_dont,/* complain_on_overflow */
445 bfd_elf_generic_reloc, /* special_function */
446 "R_AVR_6_ADIW", /* name */
447 FALSE, /* partial_inplace */
448 0xffff, /* src_mask */
449 0xffff, /* dst_mask */
450 FALSE), /* pcrel_offset */
451 /* Most significant 8 bit value of a 32 bit link-time constant. */
452 HOWTO (R_AVR_MS8_LDI, /* type */
453 24, /* rightshift */
454 1, /* size (0 = byte, 1 = short, 2 = long) */
455 8, /* bitsize */
456 FALSE, /* pc_relative */
457 0, /* bitpos */
458 complain_overflow_dont, /* complain_on_overflow */
459 bfd_elf_generic_reloc, /* special_function */
460 "R_AVR_MS8_LDI", /* name */
461 FALSE, /* partial_inplace */
462 0xffff, /* src_mask */
463 0xffff, /* dst_mask */
464 FALSE), /* pcrel_offset */
465 /* Negative most significant 8 bit value of a 32 bit link-time constant. */
466 HOWTO (R_AVR_MS8_LDI_NEG, /* type */
467 24, /* rightshift */
468 1, /* size (0 = byte, 1 = short, 2 = long) */
469 8, /* bitsize */
470 FALSE, /* pc_relative */
471 0, /* bitpos */
472 complain_overflow_dont, /* complain_on_overflow */
473 bfd_elf_generic_reloc, /* special_function */
474 "R_AVR_MS8_LDI_NEG", /* name */
475 FALSE, /* partial_inplace */
476 0xffff, /* src_mask */
477 0xffff, /* dst_mask */
478 FALSE), /* pcrel_offset */
479 /* A low 8 bit absolute relocation of 24 bit program memory address.
480 For LDI command. Will be changed when linker stubs are needed. */
481 HOWTO (R_AVR_LO8_LDI_GS, /* type */
482 1, /* rightshift */
483 1, /* size (0 = byte, 1 = short, 2 = long) */
484 8, /* bitsize */
485 FALSE, /* pc_relative */
486 0, /* bitpos */
487 complain_overflow_dont, /* complain_on_overflow */
488 bfd_elf_generic_reloc, /* special_function */
489 "R_AVR_LO8_LDI_GS", /* name */
490 FALSE, /* partial_inplace */
491 0xffff, /* src_mask */
492 0xffff, /* dst_mask */
493 FALSE), /* pcrel_offset */
494 /* A low 8 bit absolute relocation of 24 bit program memory address.
495 For LDI command. Will be changed when linker stubs are needed. */
496 HOWTO (R_AVR_HI8_LDI_GS, /* type */
497 9, /* rightshift */
498 1, /* size (0 = byte, 1 = short, 2 = long) */
499 8, /* bitsize */
500 FALSE, /* pc_relative */
501 0, /* bitpos */
502 complain_overflow_dont, /* complain_on_overflow */
503 bfd_elf_generic_reloc, /* special_function */
504 "R_AVR_HI8_LDI_GS", /* name */
505 FALSE, /* partial_inplace */
506 0xffff, /* src_mask */
507 0xffff, /* dst_mask */
508 FALSE), /* pcrel_offset */
509 /* 8 bit offset. */
510 HOWTO (R_AVR_8, /* type */
511 0, /* rightshift */
512 0, /* size (0 = byte, 1 = short, 2 = long) */
513 8, /* bitsize */
514 FALSE, /* pc_relative */
515 0, /* bitpos */
516 complain_overflow_bitfield,/* complain_on_overflow */
517 bfd_elf_generic_reloc, /* special_function */
518 "R_AVR_8", /* name */
519 FALSE, /* partial_inplace */
520 0x000000ff, /* src_mask */
521 0x000000ff, /* dst_mask */
522 FALSE), /* pcrel_offset */
523 /* lo8-part to use in .byte lo8(sym). */
524 HOWTO (R_AVR_8_LO8, /* type */
525 0, /* rightshift */
526 0, /* size (0 = byte, 1 = short, 2 = long) */
527 8, /* bitsize */
528 FALSE, /* pc_relative */
529 0, /* bitpos */
530 complain_overflow_dont,/* complain_on_overflow */
531 bfd_elf_generic_reloc, /* special_function */
532 "R_AVR_8_LO8", /* name */
533 FALSE, /* partial_inplace */
534 0xffffff, /* src_mask */
535 0xffffff, /* dst_mask */
536 FALSE), /* pcrel_offset */
537 /* hi8-part to use in .byte hi8(sym). */
538 HOWTO (R_AVR_8_HI8, /* type */
539 8, /* rightshift */
540 0, /* size (0 = byte, 1 = short, 2 = long) */
541 8, /* bitsize */
542 FALSE, /* pc_relative */
543 0, /* bitpos */
544 complain_overflow_dont,/* complain_on_overflow */
545 bfd_elf_generic_reloc, /* special_function */
546 "R_AVR_8_HI8", /* name */
547 FALSE, /* partial_inplace */
548 0xffffff, /* src_mask */
549 0xffffff, /* dst_mask */
550 FALSE), /* pcrel_offset */
551 /* hlo8-part to use in .byte hlo8(sym). */
552 HOWTO (R_AVR_8_HLO8, /* type */
553 16, /* rightshift */
554 0, /* size (0 = byte, 1 = short, 2 = long) */
555 8, /* bitsize */
556 FALSE, /* pc_relative */
557 0, /* bitpos */
558 complain_overflow_dont,/* complain_on_overflow */
559 bfd_elf_generic_reloc, /* special_function */
560 "R_AVR_8_HLO8", /* name */
561 FALSE, /* partial_inplace */
562 0xffffff, /* src_mask */
563 0xffffff, /* dst_mask */
564 FALSE), /* pcrel_offset */
565 HOWTO (R_AVR_DIFF8, /* type */
566 0, /* rightshift */
567 0, /* size (0 = byte, 1 = short, 2 = long) */
568 8, /* bitsize */
569 FALSE, /* pc_relative */
570 0, /* bitpos */
571 complain_overflow_bitfield, /* complain_on_overflow */
572 bfd_elf_avr_diff_reloc, /* special_function */
573 "R_AVR_DIFF8", /* name */
574 FALSE, /* partial_inplace */
575 0, /* src_mask */
576 0xff, /* dst_mask */
577 FALSE), /* pcrel_offset */
578 HOWTO (R_AVR_DIFF16, /* type */
579 0, /* rightshift */
580 1, /* size (0 = byte, 1 = short, 2 = long) */
581 16, /* bitsize */
582 FALSE, /* pc_relative */
583 0, /* bitpos */
584 complain_overflow_bitfield, /* complain_on_overflow */
585 bfd_elf_avr_diff_reloc,/* special_function */
586 "R_AVR_DIFF16", /* name */
587 FALSE, /* partial_inplace */
588 0, /* src_mask */
589 0xffff, /* dst_mask */
590 FALSE), /* pcrel_offset */
591 HOWTO (R_AVR_DIFF32, /* type */
592 0, /* rightshift */
593 2, /* size (0 = byte, 1 = short, 2 = long) */
594 32, /* bitsize */
595 FALSE, /* pc_relative */
596 0, /* bitpos */
597 complain_overflow_bitfield, /* complain_on_overflow */
598 bfd_elf_avr_diff_reloc,/* special_function */
599 "R_AVR_DIFF32", /* name */
600 FALSE, /* partial_inplace */
601 0, /* src_mask */
602 0xffffffff, /* dst_mask */
603 FALSE), /* pcrel_offset */
604 /* 7 bit immediate for LDS/STS in Tiny core. */
605 HOWTO (R_AVR_LDS_STS_16, /* type */
606 0, /* rightshift */
607 1, /* size (0 = byte, 1 = short, 2 = long) */
608 7, /* bitsize */
609 FALSE, /* pc_relative */
610 0, /* bitpos */
611 complain_overflow_dont,/* complain_on_overflow */
612 bfd_elf_generic_reloc, /* special_function */
613 "R_AVR_LDS_STS_16", /* name */
614 FALSE, /* partial_inplace */
615 0xffff, /* src_mask */
616 0xffff, /* dst_mask */
617 FALSE), /* pcrel_offset */
618
619 HOWTO (R_AVR_PORT6, /* type */
620 0, /* rightshift */
621 0, /* size (0 = byte, 1 = short, 2 = long) */
622 6, /* bitsize */
623 FALSE, /* pc_relative */
624 0, /* bitpos */
625 complain_overflow_dont,/* complain_on_overflow */
626 bfd_elf_generic_reloc, /* special_function */
627 "R_AVR_PORT6", /* name */
628 FALSE, /* partial_inplace */
629 0xffffff, /* src_mask */
630 0xffffff, /* dst_mask */
631 FALSE), /* pcrel_offset */
632 HOWTO (R_AVR_PORT5, /* type */
633 0, /* rightshift */
634 0, /* size (0 = byte, 1 = short, 2 = long) */
635 5, /* bitsize */
636 FALSE, /* pc_relative */
637 0, /* bitpos */
638 complain_overflow_dont,/* complain_on_overflow */
639 bfd_elf_generic_reloc, /* special_function */
640 "R_AVR_PORT5", /* name */
641 FALSE, /* partial_inplace */
642 0xffffff, /* src_mask */
643 0xffffff, /* dst_mask */
644 FALSE), /* pcrel_offset */
645
646 /* A 32 bit PC relative relocation. */
647 HOWTO (R_AVR_32_PCREL, /* type */
648 0, /* rightshift */
649 2, /* size (0 = byte, 1 = short, 2 = long) */
650 32, /* bitsize */
651 TRUE, /* pc_relative */
652 0, /* bitpos */
653 complain_overflow_bitfield, /* complain_on_overflow */
654 bfd_elf_generic_reloc, /* special_function */
655 "R_AVR_32_PCREL", /* name */
656 FALSE, /* partial_inplace */
657 0xffffffff, /* src_mask */
658 0xffffffff, /* dst_mask */
659 TRUE), /* pcrel_offset */
660 };
661
662 /* Map BFD reloc types to AVR ELF reloc types. */
663
664 struct avr_reloc_map
665 {
666 bfd_reloc_code_real_type bfd_reloc_val;
667 unsigned int elf_reloc_val;
668 };
669
670 static const struct avr_reloc_map avr_reloc_map[] =
671 {
672 { BFD_RELOC_NONE, R_AVR_NONE },
673 { BFD_RELOC_32, R_AVR_32 },
674 { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL },
675 { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL },
676 { BFD_RELOC_16, R_AVR_16 },
677 { BFD_RELOC_AVR_16_PM, R_AVR_16_PM },
678 { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI},
679 { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI },
680 { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI },
681 { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI },
682 { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG },
683 { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG },
684 { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG },
685 { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG },
686 { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM },
687 { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS },
688 { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM },
689 { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS },
690 { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM },
691 { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG },
692 { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG },
693 { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG },
694 { BFD_RELOC_AVR_CALL, R_AVR_CALL },
695 { BFD_RELOC_AVR_LDI, R_AVR_LDI },
696 { BFD_RELOC_AVR_6, R_AVR_6 },
697 { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW },
698 { BFD_RELOC_8, R_AVR_8 },
699 { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 },
700 { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 },
701 { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 },
702 { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 },
703 { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 },
704 { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 },
705 { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16},
706 { BFD_RELOC_AVR_PORT6, R_AVR_PORT6},
707 { BFD_RELOC_AVR_PORT5, R_AVR_PORT5},
708 { BFD_RELOC_32_PCREL, R_AVR_32_PCREL}
709 };
710
711 /* Meant to be filled one day with the wrap around address for the
712 specific device. I.e. should get the value 0x4000 for 16k devices,
713 0x8000 for 32k devices and so on.
714
715 We initialize it here with a value of 0x1000000 resulting in
716 that we will never suggest a wrap-around jump during relaxation.
717 The logic of the source code later on assumes that in
718 avr_pc_wrap_around one single bit is set. */
719 static bfd_vma avr_pc_wrap_around = 0x10000000;
720
721 /* If this variable holds a value different from zero, the linker relaxation
722 machine will try to optimize call/ret sequences by a single jump
723 instruction. This option could be switched off by a linker switch. */
724 static int avr_replace_call_ret_sequences = 1;
725 \f
726
727 /* Per-section relaxation related information for avr. */
728
729 struct avr_relax_info
730 {
731 /* Track the avr property records that apply to this section. */
732
733 struct
734 {
735 /* Number of records in the list. */
736 unsigned count;
737
738 /* How many records worth of space have we allocated. */
739 unsigned allocated;
740
741 /* The records, only COUNT records are initialised. */
742 struct avr_property_record *items;
743 } records;
744 };
745
746 /* Per section data, specialised for avr. */
747
748 struct elf_avr_section_data
749 {
750 /* The standard data must appear first. */
751 struct bfd_elf_section_data elf;
752
753 /* Relaxation related information. */
754 struct avr_relax_info relax_info;
755 };
756
757 /* Possibly initialise avr specific data for new section SEC from ABFD. */
758
759 static bfd_boolean
760 elf_avr_new_section_hook (bfd *abfd, asection *sec)
761 {
762 if (!sec->used_by_bfd)
763 {
764 struct elf_avr_section_data *sdata;
765 bfd_size_type amt = sizeof (*sdata);
766
767 sdata = bfd_zalloc (abfd, amt);
768 if (sdata == NULL)
769 return FALSE;
770 sec->used_by_bfd = sdata;
771 }
772
773 return _bfd_elf_new_section_hook (abfd, sec);
774 }
775
776 /* Return a pointer to the relaxation information for SEC. */
777
778 static struct avr_relax_info *
779 get_avr_relax_info (asection *sec)
780 {
781 struct elf_avr_section_data *section_data;
782
783 /* No info available if no section or if it is an output section. */
784 if (!sec || sec == sec->output_section)
785 return NULL;
786
787 section_data = (struct elf_avr_section_data *) elf_section_data (sec);
788 return &section_data->relax_info;
789 }
790
791 /* Initialise the per section relaxation information for SEC. */
792
793 static void
794 init_avr_relax_info (asection *sec)
795 {
796 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
797
798 relax_info->records.count = 0;
799 relax_info->records.allocated = 0;
800 relax_info->records.items = NULL;
801 }
802
803 /* Initialize an entry in the stub hash table. */
804
805 static struct bfd_hash_entry *
806 stub_hash_newfunc (struct bfd_hash_entry *entry,
807 struct bfd_hash_table *table,
808 const char *string)
809 {
810 /* Allocate the structure if it has not already been allocated by a
811 subclass. */
812 if (entry == NULL)
813 {
814 entry = bfd_hash_allocate (table,
815 sizeof (struct elf32_avr_stub_hash_entry));
816 if (entry == NULL)
817 return entry;
818 }
819
820 /* Call the allocation method of the superclass. */
821 entry = bfd_hash_newfunc (entry, table, string);
822 if (entry != NULL)
823 {
824 struct elf32_avr_stub_hash_entry *hsh;
825
826 /* Initialize the local fields. */
827 hsh = avr_stub_hash_entry (entry);
828 hsh->stub_offset = 0;
829 hsh->target_value = 0;
830 }
831
832 return entry;
833 }
834
835 /* This function is just a straight passthrough to the real
836 function in linker.c. Its prupose is so that its address
837 can be compared inside the avr_link_hash_table macro. */
838
839 static struct bfd_hash_entry *
840 elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry,
841 struct bfd_hash_table * table,
842 const char * string)
843 {
844 return _bfd_elf_link_hash_newfunc (entry, table, string);
845 }
846
847 /* Free the derived linker hash table. */
848
849 static void
850 elf32_avr_link_hash_table_free (bfd *obfd)
851 {
852 struct elf32_avr_link_hash_table *htab
853 = (struct elf32_avr_link_hash_table *) obfd->link.hash;
854
855 /* Free the address mapping table. */
856 if (htab->amt_stub_offsets != NULL)
857 free (htab->amt_stub_offsets);
858 if (htab->amt_destination_addr != NULL)
859 free (htab->amt_destination_addr);
860
861 bfd_hash_table_free (&htab->bstab);
862 _bfd_elf_link_hash_table_free (obfd);
863 }
864
865 /* Create the derived linker hash table. The AVR ELF port uses the derived
866 hash table to keep information specific to the AVR ELF linker (without
867 using static variables). */
868
869 static struct bfd_link_hash_table *
870 elf32_avr_link_hash_table_create (bfd *abfd)
871 {
872 struct elf32_avr_link_hash_table *htab;
873 bfd_size_type amt = sizeof (*htab);
874
875 htab = bfd_zmalloc (amt);
876 if (htab == NULL)
877 return NULL;
878
879 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
880 elf32_avr_link_hash_newfunc,
881 sizeof (struct elf_link_hash_entry),
882 AVR_ELF_DATA))
883 {
884 free (htab);
885 return NULL;
886 }
887
888 /* Init the stub hash table too. */
889 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
890 sizeof (struct elf32_avr_stub_hash_entry)))
891 {
892 _bfd_elf_link_hash_table_free (abfd);
893 return NULL;
894 }
895 htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free;
896
897 return &htab->etab.root;
898 }
899
900 /* Calculates the effective distance of a pc relative jump/call. */
901
902 static int
903 avr_relative_distance_considering_wrap_around (unsigned int distance)
904 {
905 unsigned int wrap_around_mask = avr_pc_wrap_around - 1;
906 int dist_with_wrap_around = distance & wrap_around_mask;
907
908 if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1)))
909 dist_with_wrap_around -= avr_pc_wrap_around;
910
911 return dist_with_wrap_around;
912 }
913
914
915 static reloc_howto_type *
916 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
917 bfd_reloc_code_real_type code)
918 {
919 unsigned int i;
920
921 for (i = 0;
922 i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
923 i++)
924 if (avr_reloc_map[i].bfd_reloc_val == code)
925 return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
926
927 return NULL;
928 }
929
930 static reloc_howto_type *
931 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
932 const char *r_name)
933 {
934 unsigned int i;
935
936 for (i = 0;
937 i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]);
938 i++)
939 if (elf_avr_howto_table[i].name != NULL
940 && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0)
941 return &elf_avr_howto_table[i];
942
943 return NULL;
944 }
945
946 /* Set the howto pointer for an AVR ELF reloc. */
947
948 static void
949 avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
950 arelent *cache_ptr,
951 Elf_Internal_Rela *dst)
952 {
953 unsigned int r_type;
954
955 r_type = ELF32_R_TYPE (dst->r_info);
956 if (r_type >= (unsigned int) R_AVR_max)
957 {
958 _bfd_error_handler (_("%B: invalid AVR reloc number: %d"), abfd, r_type);
959 r_type = 0;
960 }
961 cache_ptr->howto = &elf_avr_howto_table[r_type];
962 }
963
964 static bfd_boolean
965 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
966 {
967 return (relocation >= 0x020000);
968 }
969
970 /* Returns the address of the corresponding stub if there is one.
971 Returns otherwise an address above 0x020000. This function
972 could also be used, if there is no knowledge on the section where
973 the destination is found. */
974
975 static bfd_vma
976 avr_get_stub_addr (bfd_vma srel,
977 struct elf32_avr_link_hash_table *htab)
978 {
979 unsigned int sindex;
980 bfd_vma stub_sec_addr =
981 (htab->stub_sec->output_section->vma +
982 htab->stub_sec->output_offset);
983
984 for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
985 if (htab->amt_destination_addr[sindex] == srel)
986 return htab->amt_stub_offsets[sindex] + stub_sec_addr;
987
988 /* Return an address that could not be reached by 16 bit relocs. */
989 return 0x020000;
990 }
991
992 /* Perform a diff relocation. Nothing to do, as the difference value is already
993 written into the section's contents. */
994
995 static bfd_reloc_status_type
996 bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
997 arelent *reloc_entry ATTRIBUTE_UNUSED,
998 asymbol *symbol ATTRIBUTE_UNUSED,
999 void *data ATTRIBUTE_UNUSED,
1000 asection *input_section ATTRIBUTE_UNUSED,
1001 bfd *output_bfd ATTRIBUTE_UNUSED,
1002 char **error_message ATTRIBUTE_UNUSED)
1003 {
1004 return bfd_reloc_ok;
1005 }
1006
1007
1008 /* Perform a single relocation. By default we use the standard BFD
1009 routines, but a few relocs, we have to do them ourselves. */
1010
1011 static bfd_reloc_status_type
1012 avr_final_link_relocate (reloc_howto_type * howto,
1013 bfd * input_bfd,
1014 asection * input_section,
1015 bfd_byte * contents,
1016 Elf_Internal_Rela * rel,
1017 bfd_vma relocation,
1018 struct elf32_avr_link_hash_table * htab)
1019 {
1020 bfd_reloc_status_type r = bfd_reloc_ok;
1021 bfd_vma x;
1022 bfd_signed_vma srel;
1023 bfd_signed_vma reloc_addr;
1024 bfd_boolean use_stubs = FALSE;
1025 /* Usually is 0, unless we are generating code for a bootloader. */
1026 bfd_signed_vma base_addr = htab->vector_base;
1027
1028 /* Absolute addr of the reloc in the final excecutable. */
1029 reloc_addr = rel->r_offset + input_section->output_section->vma
1030 + input_section->output_offset;
1031
1032 switch (howto->type)
1033 {
1034 case R_AVR_7_PCREL:
1035 contents += rel->r_offset;
1036 srel = (bfd_signed_vma) relocation;
1037 srel += rel->r_addend;
1038 srel -= rel->r_offset;
1039 srel -= 2; /* Branch instructions add 2 to the PC... */
1040 srel -= (input_section->output_section->vma +
1041 input_section->output_offset);
1042
1043 if (srel & 1)
1044 return bfd_reloc_outofrange;
1045 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
1046 return bfd_reloc_overflow;
1047 x = bfd_get_16 (input_bfd, contents);
1048 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
1049 bfd_put_16 (input_bfd, x, contents);
1050 break;
1051
1052 case R_AVR_13_PCREL:
1053 contents += rel->r_offset;
1054 srel = (bfd_signed_vma) relocation;
1055 srel += rel->r_addend;
1056 srel -= rel->r_offset;
1057 srel -= 2; /* Branch instructions add 2 to the PC... */
1058 srel -= (input_section->output_section->vma +
1059 input_section->output_offset);
1060
1061 if (srel & 1)
1062 return bfd_reloc_outofrange;
1063
1064 srel = avr_relative_distance_considering_wrap_around (srel);
1065
1066 /* AVR addresses commands as words. */
1067 srel >>= 1;
1068
1069 /* Check for overflow. */
1070 if (srel < -2048 || srel > 2047)
1071 {
1072 /* Relative distance is too large. */
1073
1074 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1075 switch (bfd_get_mach (input_bfd))
1076 {
1077 case bfd_mach_avr2:
1078 case bfd_mach_avr25:
1079 case bfd_mach_avr4:
1080 break;
1081
1082 default:
1083 return bfd_reloc_overflow;
1084 }
1085 }
1086
1087 x = bfd_get_16 (input_bfd, contents);
1088 x = (x & 0xf000) | (srel & 0xfff);
1089 bfd_put_16 (input_bfd, x, contents);
1090 break;
1091
1092 case R_AVR_LO8_LDI:
1093 contents += rel->r_offset;
1094 srel = (bfd_signed_vma) relocation + rel->r_addend;
1095 x = bfd_get_16 (input_bfd, contents);
1096 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1097 bfd_put_16 (input_bfd, x, contents);
1098 break;
1099
1100 case R_AVR_LDI:
1101 contents += rel->r_offset;
1102 srel = (bfd_signed_vma) relocation + rel->r_addend;
1103 if (((srel > 0) && (srel & 0xffff) > 255)
1104 || ((srel < 0) && ((-srel) & 0xffff) > 128))
1105 /* Remove offset for data/eeprom section. */
1106 return bfd_reloc_overflow;
1107
1108 x = bfd_get_16 (input_bfd, contents);
1109 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1110 bfd_put_16 (input_bfd, x, contents);
1111 break;
1112
1113 case R_AVR_6:
1114 contents += rel->r_offset;
1115 srel = (bfd_signed_vma) relocation + rel->r_addend;
1116 if (((srel & 0xffff) > 63) || (srel < 0))
1117 /* Remove offset for data/eeprom section. */
1118 return bfd_reloc_overflow;
1119 x = bfd_get_16 (input_bfd, contents);
1120 x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
1121 | ((srel & (1 << 5)) << 8));
1122 bfd_put_16 (input_bfd, x, contents);
1123 break;
1124
1125 case R_AVR_6_ADIW:
1126 contents += rel->r_offset;
1127 srel = (bfd_signed_vma) relocation + rel->r_addend;
1128 if (((srel & 0xffff) > 63) || (srel < 0))
1129 /* Remove offset for data/eeprom section. */
1130 return bfd_reloc_overflow;
1131 x = bfd_get_16 (input_bfd, contents);
1132 x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
1133 bfd_put_16 (input_bfd, x, contents);
1134 break;
1135
1136 case R_AVR_HI8_LDI:
1137 contents += rel->r_offset;
1138 srel = (bfd_signed_vma) relocation + rel->r_addend;
1139 srel = (srel >> 8) & 0xff;
1140 x = bfd_get_16 (input_bfd, contents);
1141 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1142 bfd_put_16 (input_bfd, x, contents);
1143 break;
1144
1145 case R_AVR_HH8_LDI:
1146 contents += rel->r_offset;
1147 srel = (bfd_signed_vma) relocation + rel->r_addend;
1148 srel = (srel >> 16) & 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);
1152 break;
1153
1154 case R_AVR_MS8_LDI:
1155 contents += rel->r_offset;
1156 srel = (bfd_signed_vma) relocation + rel->r_addend;
1157 srel = (srel >> 24) & 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);
1161 break;
1162
1163 case R_AVR_LO8_LDI_NEG:
1164 contents += rel->r_offset;
1165 srel = (bfd_signed_vma) relocation + rel->r_addend;
1166 srel = -srel;
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);
1170 break;
1171
1172 case R_AVR_HI8_LDI_NEG:
1173 contents += rel->r_offset;
1174 srel = (bfd_signed_vma) relocation + rel->r_addend;
1175 srel = -srel;
1176 srel = (srel >> 8) & 0xff;
1177 x = bfd_get_16 (input_bfd, contents);
1178 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1179 bfd_put_16 (input_bfd, x, contents);
1180 break;
1181
1182 case R_AVR_HH8_LDI_NEG:
1183 contents += rel->r_offset;
1184 srel = (bfd_signed_vma) relocation + rel->r_addend;
1185 srel = -srel;
1186 srel = (srel >> 16) & 0xff;
1187 x = bfd_get_16 (input_bfd, contents);
1188 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1189 bfd_put_16 (input_bfd, x, contents);
1190 break;
1191
1192 case R_AVR_MS8_LDI_NEG:
1193 contents += rel->r_offset;
1194 srel = (bfd_signed_vma) relocation + rel->r_addend;
1195 srel = -srel;
1196 srel = (srel >> 24) & 0xff;
1197 x = bfd_get_16 (input_bfd, contents);
1198 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1199 bfd_put_16 (input_bfd, x, contents);
1200 break;
1201
1202 case R_AVR_LO8_LDI_GS:
1203 use_stubs = (!htab->no_stubs);
1204 /* Fall through. */
1205 case R_AVR_LO8_LDI_PM:
1206 contents += rel->r_offset;
1207 srel = (bfd_signed_vma) relocation + rel->r_addend;
1208
1209 if (use_stubs
1210 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1211 {
1212 bfd_vma old_srel = srel;
1213
1214 /* We need to use the address of the stub instead. */
1215 srel = avr_get_stub_addr (srel, htab);
1216 if (debug_stubs)
1217 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1218 "reloc at address 0x%x.\n",
1219 (unsigned int) srel,
1220 (unsigned int) old_srel,
1221 (unsigned int) reloc_addr);
1222
1223 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1224 return bfd_reloc_outofrange;
1225 }
1226
1227 if (srel & 1)
1228 return bfd_reloc_outofrange;
1229 srel = srel >> 1;
1230 x = bfd_get_16 (input_bfd, contents);
1231 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1232 bfd_put_16 (input_bfd, x, contents);
1233 break;
1234
1235 case R_AVR_HI8_LDI_GS:
1236 use_stubs = (!htab->no_stubs);
1237 /* Fall through. */
1238 case R_AVR_HI8_LDI_PM:
1239 contents += rel->r_offset;
1240 srel = (bfd_signed_vma) relocation + rel->r_addend;
1241
1242 if (use_stubs
1243 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1244 {
1245 bfd_vma old_srel = srel;
1246
1247 /* We need to use the address of the stub instead. */
1248 srel = avr_get_stub_addr (srel, htab);
1249 if (debug_stubs)
1250 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1251 "reloc at address 0x%x.\n",
1252 (unsigned int) srel,
1253 (unsigned int) old_srel,
1254 (unsigned int) reloc_addr);
1255
1256 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1257 return bfd_reloc_outofrange;
1258 }
1259
1260 if (srel & 1)
1261 return bfd_reloc_outofrange;
1262 srel = srel >> 1;
1263 srel = (srel >> 8) & 0xff;
1264 x = bfd_get_16 (input_bfd, contents);
1265 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1266 bfd_put_16 (input_bfd, x, contents);
1267 break;
1268
1269 case R_AVR_HH8_LDI_PM:
1270 contents += rel->r_offset;
1271 srel = (bfd_signed_vma) relocation + rel->r_addend;
1272 if (srel & 1)
1273 return bfd_reloc_outofrange;
1274 srel = srel >> 1;
1275 srel = (srel >> 16) & 0xff;
1276 x = bfd_get_16 (input_bfd, contents);
1277 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1278 bfd_put_16 (input_bfd, x, contents);
1279 break;
1280
1281 case R_AVR_LO8_LDI_PM_NEG:
1282 contents += rel->r_offset;
1283 srel = (bfd_signed_vma) relocation + rel->r_addend;
1284 srel = -srel;
1285 if (srel & 1)
1286 return bfd_reloc_outofrange;
1287 srel = srel >> 1;
1288 x = bfd_get_16 (input_bfd, contents);
1289 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1290 bfd_put_16 (input_bfd, x, contents);
1291 break;
1292
1293 case R_AVR_HI8_LDI_PM_NEG:
1294 contents += rel->r_offset;
1295 srel = (bfd_signed_vma) relocation + rel->r_addend;
1296 srel = -srel;
1297 if (srel & 1)
1298 return bfd_reloc_outofrange;
1299 srel = srel >> 1;
1300 srel = (srel >> 8) & 0xff;
1301 x = bfd_get_16 (input_bfd, contents);
1302 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1303 bfd_put_16 (input_bfd, x, contents);
1304 break;
1305
1306 case R_AVR_HH8_LDI_PM_NEG:
1307 contents += rel->r_offset;
1308 srel = (bfd_signed_vma) relocation + rel->r_addend;
1309 srel = -srel;
1310 if (srel & 1)
1311 return bfd_reloc_outofrange;
1312 srel = srel >> 1;
1313 srel = (srel >> 16) & 0xff;
1314 x = bfd_get_16 (input_bfd, contents);
1315 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1316 bfd_put_16 (input_bfd, x, contents);
1317 break;
1318
1319 case R_AVR_CALL:
1320 contents += rel->r_offset;
1321 srel = (bfd_signed_vma) relocation + rel->r_addend;
1322 if (srel & 1)
1323 return bfd_reloc_outofrange;
1324 srel = srel >> 1;
1325 x = bfd_get_16 (input_bfd, contents);
1326 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
1327 bfd_put_16 (input_bfd, x, contents);
1328 bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
1329 break;
1330
1331 case R_AVR_16_PM:
1332 use_stubs = (!htab->no_stubs);
1333 contents += rel->r_offset;
1334 srel = (bfd_signed_vma) relocation + rel->r_addend;
1335
1336 if (use_stubs
1337 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1338 {
1339 bfd_vma old_srel = srel;
1340
1341 /* We need to use the address of the stub instead. */
1342 srel = avr_get_stub_addr (srel,htab);
1343 if (debug_stubs)
1344 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1345 "reloc at address 0x%x.\n",
1346 (unsigned int) srel,
1347 (unsigned int) old_srel,
1348 (unsigned int) reloc_addr);
1349
1350 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1351 return bfd_reloc_outofrange;
1352 }
1353
1354 if (srel & 1)
1355 return bfd_reloc_outofrange;
1356 srel = srel >> 1;
1357 bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
1358 break;
1359
1360 case R_AVR_DIFF8:
1361 case R_AVR_DIFF16:
1362 case R_AVR_DIFF32:
1363 /* Nothing to do here, as contents already contains the diff value. */
1364 r = bfd_reloc_ok;
1365 break;
1366
1367 case R_AVR_LDS_STS_16:
1368 contents += rel->r_offset;
1369 srel = (bfd_signed_vma) relocation + rel->r_addend;
1370 if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
1371 return bfd_reloc_outofrange;
1372 srel = srel & 0x7f;
1373 x = bfd_get_16 (input_bfd, contents);
1374 x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
1375 bfd_put_16 (input_bfd, x, contents);
1376 break;
1377
1378 case R_AVR_PORT6:
1379 contents += rel->r_offset;
1380 srel = (bfd_signed_vma) relocation + rel->r_addend;
1381 if ((srel & 0xffff) > 0x3f)
1382 return bfd_reloc_outofrange;
1383 x = bfd_get_16 (input_bfd, contents);
1384 x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
1385 bfd_put_16 (input_bfd, x, contents);
1386 break;
1387
1388 case R_AVR_PORT5:
1389 contents += rel->r_offset;
1390 srel = (bfd_signed_vma) relocation + rel->r_addend;
1391 if ((srel & 0xffff) > 0x1f)
1392 return bfd_reloc_outofrange;
1393 x = bfd_get_16 (input_bfd, contents);
1394 x = (x & 0xff07) | ((srel & 0x1f) << 3);
1395 bfd_put_16 (input_bfd, x, contents);
1396 break;
1397
1398 default:
1399 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1400 contents, rel->r_offset,
1401 relocation, rel->r_addend);
1402 }
1403
1404 return r;
1405 }
1406
1407 /* Relocate an AVR ELF section. */
1408
1409 static bfd_boolean
1410 elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1411 struct bfd_link_info *info,
1412 bfd *input_bfd,
1413 asection *input_section,
1414 bfd_byte *contents,
1415 Elf_Internal_Rela *relocs,
1416 Elf_Internal_Sym *local_syms,
1417 asection **local_sections)
1418 {
1419 Elf_Internal_Shdr * symtab_hdr;
1420 struct elf_link_hash_entry ** sym_hashes;
1421 Elf_Internal_Rela * rel;
1422 Elf_Internal_Rela * relend;
1423 struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
1424
1425 if (htab == NULL)
1426 return FALSE;
1427
1428 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1429 sym_hashes = elf_sym_hashes (input_bfd);
1430 relend = relocs + input_section->reloc_count;
1431
1432 for (rel = relocs; rel < relend; rel ++)
1433 {
1434 reloc_howto_type * howto;
1435 unsigned long r_symndx;
1436 Elf_Internal_Sym * sym;
1437 asection * sec;
1438 struct elf_link_hash_entry * h;
1439 bfd_vma relocation;
1440 bfd_reloc_status_type r;
1441 const char * name;
1442 int r_type;
1443
1444 r_type = ELF32_R_TYPE (rel->r_info);
1445 r_symndx = ELF32_R_SYM (rel->r_info);
1446 howto = elf_avr_howto_table + r_type;
1447 h = NULL;
1448 sym = NULL;
1449 sec = NULL;
1450
1451 if (r_symndx < symtab_hdr->sh_info)
1452 {
1453 sym = local_syms + r_symndx;
1454 sec = local_sections [r_symndx];
1455 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1456
1457 name = bfd_elf_string_from_elf_section
1458 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1459 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
1460 }
1461 else
1462 {
1463 bfd_boolean unresolved_reloc, warned, ignored;
1464
1465 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1466 r_symndx, symtab_hdr, sym_hashes,
1467 h, sec, relocation,
1468 unresolved_reloc, warned, ignored);
1469
1470 name = h->root.root.string;
1471 }
1472
1473 if (sec != NULL && discarded_section (sec))
1474 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1475 rel, 1, relend, howto, 0, contents);
1476
1477 if (bfd_link_relocatable (info))
1478 continue;
1479
1480 r = avr_final_link_relocate (howto, input_bfd, input_section,
1481 contents, rel, relocation, htab);
1482
1483 if (r != bfd_reloc_ok)
1484 {
1485 const char * msg = (const char *) NULL;
1486
1487 switch (r)
1488 {
1489 case bfd_reloc_overflow:
1490 (*info->callbacks->reloc_overflow)
1491 (info, (h ? &h->root : NULL), name, howto->name,
1492 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1493 break;
1494
1495 case bfd_reloc_undefined:
1496 (*info->callbacks->undefined_symbol)
1497 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1498 break;
1499
1500 case bfd_reloc_outofrange:
1501 msg = _("internal error: out of range error");
1502 break;
1503
1504 case bfd_reloc_notsupported:
1505 msg = _("internal error: unsupported relocation error");
1506 break;
1507
1508 case bfd_reloc_dangerous:
1509 msg = _("internal error: dangerous relocation");
1510 break;
1511
1512 default:
1513 msg = _("internal error: unknown error");
1514 break;
1515 }
1516
1517 if (msg)
1518 (*info->callbacks->warning) (info, msg, name, input_bfd,
1519 input_section, rel->r_offset);
1520 }
1521 }
1522
1523 return TRUE;
1524 }
1525
1526 /* The final processing done just before writing out a AVR ELF object
1527 file. This gets the AVR architecture right based on the machine
1528 number. */
1529
1530 static void
1531 bfd_elf_avr_final_write_processing (bfd *abfd,
1532 bfd_boolean linker ATTRIBUTE_UNUSED)
1533 {
1534 unsigned long val;
1535
1536 switch (bfd_get_mach (abfd))
1537 {
1538 default:
1539 case bfd_mach_avr2:
1540 val = E_AVR_MACH_AVR2;
1541 break;
1542
1543 case bfd_mach_avr1:
1544 val = E_AVR_MACH_AVR1;
1545 break;
1546
1547 case bfd_mach_avr25:
1548 val = E_AVR_MACH_AVR25;
1549 break;
1550
1551 case bfd_mach_avr3:
1552 val = E_AVR_MACH_AVR3;
1553 break;
1554
1555 case bfd_mach_avr31:
1556 val = E_AVR_MACH_AVR31;
1557 break;
1558
1559 case bfd_mach_avr35:
1560 val = E_AVR_MACH_AVR35;
1561 break;
1562
1563 case bfd_mach_avr4:
1564 val = E_AVR_MACH_AVR4;
1565 break;
1566
1567 case bfd_mach_avr5:
1568 val = E_AVR_MACH_AVR5;
1569 break;
1570
1571 case bfd_mach_avr51:
1572 val = E_AVR_MACH_AVR51;
1573 break;
1574
1575 case bfd_mach_avr6:
1576 val = E_AVR_MACH_AVR6;
1577 break;
1578
1579 case bfd_mach_avrxmega1:
1580 val = E_AVR_MACH_XMEGA1;
1581 break;
1582
1583 case bfd_mach_avrxmega2:
1584 val = E_AVR_MACH_XMEGA2;
1585 break;
1586
1587 case bfd_mach_avrxmega3:
1588 val = E_AVR_MACH_XMEGA3;
1589 break;
1590
1591 case bfd_mach_avrxmega4:
1592 val = E_AVR_MACH_XMEGA4;
1593 break;
1594
1595 case bfd_mach_avrxmega5:
1596 val = E_AVR_MACH_XMEGA5;
1597 break;
1598
1599 case bfd_mach_avrxmega6:
1600 val = E_AVR_MACH_XMEGA6;
1601 break;
1602
1603 case bfd_mach_avrxmega7:
1604 val = E_AVR_MACH_XMEGA7;
1605 break;
1606
1607 case bfd_mach_avrtiny:
1608 val = E_AVR_MACH_AVRTINY;
1609 break;
1610 }
1611
1612 elf_elfheader (abfd)->e_machine = EM_AVR;
1613 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
1614 elf_elfheader (abfd)->e_flags |= val;
1615 }
1616
1617 /* Set the right machine number. */
1618
1619 static bfd_boolean
1620 elf32_avr_object_p (bfd *abfd)
1621 {
1622 unsigned int e_set = bfd_mach_avr2;
1623
1624 if (elf_elfheader (abfd)->e_machine == EM_AVR
1625 || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
1626 {
1627 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
1628
1629 switch (e_mach)
1630 {
1631 default:
1632 case E_AVR_MACH_AVR2:
1633 e_set = bfd_mach_avr2;
1634 break;
1635
1636 case E_AVR_MACH_AVR1:
1637 e_set = bfd_mach_avr1;
1638 break;
1639
1640 case E_AVR_MACH_AVR25:
1641 e_set = bfd_mach_avr25;
1642 break;
1643
1644 case E_AVR_MACH_AVR3:
1645 e_set = bfd_mach_avr3;
1646 break;
1647
1648 case E_AVR_MACH_AVR31:
1649 e_set = bfd_mach_avr31;
1650 break;
1651
1652 case E_AVR_MACH_AVR35:
1653 e_set = bfd_mach_avr35;
1654 break;
1655
1656 case E_AVR_MACH_AVR4:
1657 e_set = bfd_mach_avr4;
1658 break;
1659
1660 case E_AVR_MACH_AVR5:
1661 e_set = bfd_mach_avr5;
1662 break;
1663
1664 case E_AVR_MACH_AVR51:
1665 e_set = bfd_mach_avr51;
1666 break;
1667
1668 case E_AVR_MACH_AVR6:
1669 e_set = bfd_mach_avr6;
1670 break;
1671
1672 case E_AVR_MACH_XMEGA1:
1673 e_set = bfd_mach_avrxmega1;
1674 break;
1675
1676 case E_AVR_MACH_XMEGA2:
1677 e_set = bfd_mach_avrxmega2;
1678 break;
1679
1680 case E_AVR_MACH_XMEGA3:
1681 e_set = bfd_mach_avrxmega3;
1682 break;
1683
1684 case E_AVR_MACH_XMEGA4:
1685 e_set = bfd_mach_avrxmega4;
1686 break;
1687
1688 case E_AVR_MACH_XMEGA5:
1689 e_set = bfd_mach_avrxmega5;
1690 break;
1691
1692 case E_AVR_MACH_XMEGA6:
1693 e_set = bfd_mach_avrxmega6;
1694 break;
1695
1696 case E_AVR_MACH_XMEGA7:
1697 e_set = bfd_mach_avrxmega7;
1698 break;
1699
1700 case E_AVR_MACH_AVRTINY:
1701 e_set = bfd_mach_avrtiny;
1702 break;
1703 }
1704 }
1705 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
1706 e_set);
1707 }
1708
1709 /* Returns whether the relocation type passed is a diff reloc. */
1710
1711 static bfd_boolean
1712 elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
1713 {
1714 return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
1715 ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
1716 || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
1717 }
1718
1719 /* Reduce the diff value written in the section by count if the shrinked
1720 insn address happens to fall between the two symbols for which this
1721 diff reloc was emitted. */
1722
1723 static void
1724 elf32_avr_adjust_diff_reloc_value (bfd *abfd,
1725 struct bfd_section *isec,
1726 Elf_Internal_Rela *irel,
1727 bfd_vma symval,
1728 bfd_vma shrinked_insn_address,
1729 int count)
1730 {
1731 unsigned char *reloc_contents = NULL;
1732 unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
1733 if (isec_contents == NULL)
1734 {
1735 if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
1736 return;
1737
1738 elf_section_data (isec)->this_hdr.contents = isec_contents;
1739 }
1740
1741 reloc_contents = isec_contents + irel->r_offset;
1742
1743 /* Read value written in object file. */
1744 bfd_vma x = 0;
1745 switch (ELF32_R_TYPE (irel->r_info))
1746 {
1747 case R_AVR_DIFF8:
1748 {
1749 x = *reloc_contents;
1750 break;
1751 }
1752 case R_AVR_DIFF16:
1753 {
1754 x = bfd_get_16 (abfd, reloc_contents);
1755 break;
1756 }
1757 case R_AVR_DIFF32:
1758 {
1759 x = bfd_get_32 (abfd, reloc_contents);
1760 break;
1761 }
1762 default:
1763 {
1764 BFD_FAIL();
1765 }
1766 }
1767
1768 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1769 into the object file at the reloc offset. sym2's logical value is
1770 symval (<start_of_section>) + reloc addend. Compute the start and end
1771 addresses and check if the shrinked insn falls between sym1 and sym2. */
1772
1773 bfd_vma end_address = symval + irel->r_addend;
1774 bfd_vma start_address = end_address - x;
1775
1776 /* Reduce the diff value by count bytes and write it back into section
1777 contents. */
1778
1779 if (shrinked_insn_address >= start_address
1780 && shrinked_insn_address <= end_address)
1781 {
1782 switch (ELF32_R_TYPE (irel->r_info))
1783 {
1784 case R_AVR_DIFF8:
1785 {
1786 *reloc_contents = (x - count);
1787 break;
1788 }
1789 case R_AVR_DIFF16:
1790 {
1791 bfd_put_16 (abfd, (x - count) & 0xFFFF, reloc_contents);
1792 break;
1793 }
1794 case R_AVR_DIFF32:
1795 {
1796 bfd_put_32 (abfd, (x - count) & 0xFFFFFFFF, reloc_contents);
1797 break;
1798 }
1799 default:
1800 {
1801 BFD_FAIL();
1802 }
1803 }
1804
1805 }
1806 }
1807
1808 /* Delete some bytes from a section while changing the size of an instruction.
1809 The parameter "addr" denotes the section-relative offset pointing just
1810 behind the shrinked instruction. "addr+count" point at the first
1811 byte just behind the original unshrinked instruction. */
1812
1813 static bfd_boolean
1814 elf32_avr_relax_delete_bytes (bfd *abfd,
1815 asection *sec,
1816 bfd_vma addr,
1817 int count)
1818 {
1819 Elf_Internal_Shdr *symtab_hdr;
1820 unsigned int sec_shndx;
1821 bfd_byte *contents;
1822 Elf_Internal_Rela *irel, *irelend;
1823 Elf_Internal_Sym *isym;
1824 Elf_Internal_Sym *isymbuf = NULL;
1825 bfd_vma toaddr, reloc_toaddr;
1826 struct elf_link_hash_entry **sym_hashes;
1827 struct elf_link_hash_entry **end_hashes;
1828 unsigned int symcount;
1829 struct avr_relax_info *relax_info;
1830 struct avr_property_record *prop_record = NULL;
1831 bfd_boolean did_shrink = FALSE;
1832
1833 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1834 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1835 contents = elf_section_data (sec)->this_hdr.contents;
1836 relax_info = get_avr_relax_info (sec);
1837
1838 toaddr = sec->size;
1839
1840 if (relax_info->records.count > 0)
1841 {
1842 /* There should be no property record within the range of deleted
1843 bytes, however, there might be a property record for ADDR, this is
1844 how we handle alignment directives.
1845 Find the next (if any) property record after the deleted bytes. */
1846 unsigned int i;
1847
1848 for (i = 0; i < relax_info->records.count; ++i)
1849 {
1850 bfd_vma offset = relax_info->records.items [i].offset;
1851
1852 BFD_ASSERT (offset <= addr || offset >= (addr + count));
1853 if (offset >= (addr + count))
1854 {
1855 prop_record = &relax_info->records.items [i];
1856 toaddr = offset;
1857 break;
1858 }
1859 }
1860 }
1861
1862 /* We need to look at all relocs with offsets less than toaddr. prop
1863 records handling adjusts toaddr downwards to avoid moving syms at the
1864 address of the property record, but all relocs with offsets between addr
1865 and the current value of toaddr need to have their offsets adjusted.
1866 Assume addr = 0, toaddr = 4 and count = 2. After prop records handling,
1867 toaddr becomes 2, but relocs with offsets 2 and 3 still need to be
1868 adjusted (to 0 and 1 respectively), as the first 2 bytes are now gone.
1869 So record the current value of toaddr here, and use it when adjusting
1870 reloc offsets. */
1871 reloc_toaddr = toaddr;
1872
1873 irel = elf_section_data (sec)->relocs;
1874 irelend = irel + sec->reloc_count;
1875
1876 /* Actually delete the bytes. */
1877 if (toaddr - addr - count > 0)
1878 {
1879 memmove (contents + addr, contents + addr + count,
1880 (size_t) (toaddr - addr - count));
1881 did_shrink = TRUE;
1882 }
1883 if (prop_record == NULL)
1884 {
1885 sec->size -= count;
1886 did_shrink = TRUE;
1887 }
1888 else
1889 {
1890 /* Use the property record to fill in the bytes we've opened up. */
1891 int fill = 0;
1892 switch (prop_record->type)
1893 {
1894 case RECORD_ORG_AND_FILL:
1895 fill = prop_record->data.org.fill;
1896 /* Fall through. */
1897 case RECORD_ORG:
1898 break;
1899 case RECORD_ALIGN_AND_FILL:
1900 fill = prop_record->data.align.fill;
1901 /* Fall through. */
1902 case RECORD_ALIGN:
1903 prop_record->data.align.preceding_deleted += count;
1904 break;
1905 };
1906 /* If toaddr == (addr + count), then we didn't delete anything, yet
1907 we fill count bytes backwards from toaddr. This is still ok - we
1908 end up overwriting the bytes we would have deleted. We just need
1909 to remember we didn't delete anything i.e. don't set did_shrink,
1910 so that we don't corrupt reloc offsets or symbol values.*/
1911 memset (contents + toaddr - count, fill, count);
1912
1913 /* Adjust the TOADDR to avoid moving symbols located at the address
1914 of the property record, which has not moved. */
1915 toaddr -= count;
1916 }
1917
1918 if (!did_shrink)
1919 return TRUE;
1920
1921 /* Adjust all the reloc addresses. */
1922 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1923 {
1924 bfd_vma old_reloc_address;
1925
1926 old_reloc_address = (sec->output_section->vma
1927 + sec->output_offset + irel->r_offset);
1928
1929 /* Get the new reloc address. */
1930 if ((irel->r_offset > addr
1931 && irel->r_offset < reloc_toaddr))
1932 {
1933 if (debug_relax)
1934 printf ("Relocation at address 0x%x needs to be moved.\n"
1935 "Old section offset: 0x%x, New section offset: 0x%x \n",
1936 (unsigned int) old_reloc_address,
1937 (unsigned int) irel->r_offset,
1938 (unsigned int) ((irel->r_offset) - count));
1939
1940 irel->r_offset -= count;
1941 }
1942
1943 }
1944
1945 /* The reloc's own addresses are now ok. However, we need to readjust
1946 the reloc's addend, i.e. the reloc's value if two conditions are met:
1947 1.) the reloc is relative to a symbol in this section that
1948 is located in front of the shrinked instruction
1949 2.) symbol plus addend end up behind the shrinked instruction.
1950
1951 The most common case where this happens are relocs relative to
1952 the section-start symbol.
1953
1954 This step needs to be done for all of the sections of the bfd. */
1955
1956 {
1957 struct bfd_section *isec;
1958
1959 for (isec = abfd->sections; isec; isec = isec->next)
1960 {
1961 bfd_vma symval;
1962 bfd_vma shrinked_insn_address;
1963
1964 if (isec->reloc_count == 0)
1965 continue;
1966
1967 shrinked_insn_address = (sec->output_section->vma
1968 + sec->output_offset + addr - count);
1969
1970 irel = elf_section_data (isec)->relocs;
1971 /* PR 12161: Read in the relocs for this section if necessary. */
1972 if (irel == NULL)
1973 irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
1974
1975 for (irelend = irel + isec->reloc_count;
1976 irel < irelend;
1977 irel++)
1978 {
1979 /* Read this BFD's local symbols if we haven't done
1980 so already. */
1981 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
1982 {
1983 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1984 if (isymbuf == NULL)
1985 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1986 symtab_hdr->sh_info, 0,
1987 NULL, NULL, NULL);
1988 if (isymbuf == NULL)
1989 return FALSE;
1990 }
1991
1992 /* Get the value of the symbol referred to by the reloc. */
1993 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1994 {
1995 /* A local symbol. */
1996 asection *sym_sec;
1997
1998 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1999 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2000 symval = isym->st_value;
2001 /* If the reloc is absolute, it will not have
2002 a symbol or section associated with it. */
2003 if (sym_sec == sec)
2004 {
2005 symval += sym_sec->output_section->vma
2006 + sym_sec->output_offset;
2007
2008 if (debug_relax)
2009 printf ("Checking if the relocation's "
2010 "addend needs corrections.\n"
2011 "Address of anchor symbol: 0x%x \n"
2012 "Address of relocation target: 0x%x \n"
2013 "Address of relaxed insn: 0x%x \n",
2014 (unsigned int) symval,
2015 (unsigned int) (symval + irel->r_addend),
2016 (unsigned int) shrinked_insn_address);
2017
2018 if (symval <= shrinked_insn_address
2019 && (symval + irel->r_addend) > shrinked_insn_address)
2020 {
2021 if (elf32_avr_is_diff_reloc (irel))
2022 {
2023 elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
2024 symval,
2025 shrinked_insn_address,
2026 count);
2027 }
2028
2029 irel->r_addend -= count;
2030
2031 if (debug_relax)
2032 printf ("Relocation's addend needed to be fixed \n");
2033 }
2034 }
2035 /* else...Reference symbol is absolute. No adjustment needed. */
2036 }
2037 /* else...Reference symbol is extern. No need for adjusting
2038 the addend. */
2039 }
2040 }
2041 }
2042
2043 /* Adjust the local symbols defined in this section. */
2044 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2045 /* Fix PR 9841, there may be no local symbols. */
2046 if (isym != NULL)
2047 {
2048 Elf_Internal_Sym *isymend;
2049
2050 isymend = isym + symtab_hdr->sh_info;
2051 for (; isym < isymend; isym++)
2052 {
2053 if (isym->st_shndx == sec_shndx)
2054 {
2055 if (isym->st_value > addr
2056 && isym->st_value <= toaddr)
2057 isym->st_value -= count;
2058
2059 if (isym->st_value <= addr
2060 && isym->st_value + isym->st_size > addr)
2061 {
2062 /* If this assert fires then we have a symbol that ends
2063 part way through an instruction. Does that make
2064 sense? */
2065 BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
2066 isym->st_size -= count;
2067 }
2068 }
2069 }
2070 }
2071
2072 /* Now adjust the global symbols defined in this section. */
2073 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2074 - symtab_hdr->sh_info);
2075 sym_hashes = elf_sym_hashes (abfd);
2076 end_hashes = sym_hashes + symcount;
2077 for (; sym_hashes < end_hashes; sym_hashes++)
2078 {
2079 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2080 if ((sym_hash->root.type == bfd_link_hash_defined
2081 || sym_hash->root.type == bfd_link_hash_defweak)
2082 && sym_hash->root.u.def.section == sec)
2083 {
2084 if (sym_hash->root.u.def.value > addr
2085 && sym_hash->root.u.def.value <= toaddr)
2086 sym_hash->root.u.def.value -= count;
2087
2088 if (sym_hash->root.u.def.value <= addr
2089 && (sym_hash->root.u.def.value + sym_hash->size > addr))
2090 {
2091 /* If this assert fires then we have a symbol that ends
2092 part way through an instruction. Does that make
2093 sense? */
2094 BFD_ASSERT (sym_hash->root.u.def.value + sym_hash->size
2095 >= addr + count);
2096 sym_hash->size -= count;
2097 }
2098 }
2099 }
2100
2101 return TRUE;
2102 }
2103
2104 static Elf_Internal_Sym *
2105 retrieve_local_syms (bfd *input_bfd)
2106 {
2107 Elf_Internal_Shdr *symtab_hdr;
2108 Elf_Internal_Sym *isymbuf;
2109 size_t locsymcount;
2110
2111 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2112 locsymcount = symtab_hdr->sh_info;
2113
2114 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2115 if (isymbuf == NULL && locsymcount != 0)
2116 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
2117 NULL, NULL, NULL);
2118
2119 /* Save the symbols for this input file so they won't be read again. */
2120 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
2121 symtab_hdr->contents = (unsigned char *) isymbuf;
2122
2123 return isymbuf;
2124 }
2125
2126 /* Get the input section for a given symbol index.
2127 If the symbol is:
2128 . a section symbol, return the section;
2129 . a common symbol, return the common section;
2130 . an undefined symbol, return the undefined section;
2131 . an indirect symbol, follow the links;
2132 . an absolute value, return the absolute section. */
2133
2134 static asection *
2135 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
2136 {
2137 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2138 asection *target_sec = NULL;
2139 if (r_symndx < symtab_hdr->sh_info)
2140 {
2141 Elf_Internal_Sym *isymbuf;
2142 unsigned int section_index;
2143
2144 isymbuf = retrieve_local_syms (abfd);
2145 section_index = isymbuf[r_symndx].st_shndx;
2146
2147 if (section_index == SHN_UNDEF)
2148 target_sec = bfd_und_section_ptr;
2149 else if (section_index == SHN_ABS)
2150 target_sec = bfd_abs_section_ptr;
2151 else if (section_index == SHN_COMMON)
2152 target_sec = bfd_com_section_ptr;
2153 else
2154 target_sec = bfd_section_from_elf_index (abfd, section_index);
2155 }
2156 else
2157 {
2158 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2159 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
2160
2161 while (h->root.type == bfd_link_hash_indirect
2162 || h->root.type == bfd_link_hash_warning)
2163 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2164
2165 switch (h->root.type)
2166 {
2167 case bfd_link_hash_defined:
2168 case bfd_link_hash_defweak:
2169 target_sec = h->root.u.def.section;
2170 break;
2171 case bfd_link_hash_common:
2172 target_sec = bfd_com_section_ptr;
2173 break;
2174 case bfd_link_hash_undefined:
2175 case bfd_link_hash_undefweak:
2176 target_sec = bfd_und_section_ptr;
2177 break;
2178 default: /* New indirect warning. */
2179 target_sec = bfd_und_section_ptr;
2180 break;
2181 }
2182 }
2183 return target_sec;
2184 }
2185
2186 /* Get the section-relative offset for a symbol number. */
2187
2188 static bfd_vma
2189 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
2190 {
2191 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2192 bfd_vma offset = 0;
2193
2194 if (r_symndx < symtab_hdr->sh_info)
2195 {
2196 Elf_Internal_Sym *isymbuf;
2197 isymbuf = retrieve_local_syms (abfd);
2198 offset = isymbuf[r_symndx].st_value;
2199 }
2200 else
2201 {
2202 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2203 struct elf_link_hash_entry *h =
2204 elf_sym_hashes (abfd)[indx];
2205
2206 while (h->root.type == bfd_link_hash_indirect
2207 || h->root.type == bfd_link_hash_warning)
2208 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2209 if (h->root.type == bfd_link_hash_defined
2210 || h->root.type == bfd_link_hash_defweak)
2211 offset = h->root.u.def.value;
2212 }
2213 return offset;
2214 }
2215
2216 /* Iterate over the property records in R_LIST, and copy each record into
2217 the list of records within the relaxation information for the section to
2218 which the record applies. */
2219
2220 static void
2221 avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
2222 {
2223 unsigned int i;
2224
2225 for (i = 0; i < r_list->record_count; ++i)
2226 {
2227 struct avr_relax_info *relax_info;
2228
2229 relax_info = get_avr_relax_info (r_list->records [i].section);
2230 BFD_ASSERT (relax_info != NULL);
2231
2232 if (relax_info->records.count
2233 == relax_info->records.allocated)
2234 {
2235 /* Allocate more space. */
2236 bfd_size_type size;
2237
2238 relax_info->records.allocated += 10;
2239 size = (sizeof (struct avr_property_record)
2240 * relax_info->records.allocated);
2241 relax_info->records.items
2242 = bfd_realloc (relax_info->records.items, size);
2243 }
2244
2245 memcpy (&relax_info->records.items [relax_info->records.count],
2246 &r_list->records [i],
2247 sizeof (struct avr_property_record));
2248 relax_info->records.count++;
2249 }
2250 }
2251
2252 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2253 ordering callback from QSORT. */
2254
2255 static int
2256 avr_property_record_compare (const void *ap, const void *bp)
2257 {
2258 const struct avr_property_record *a
2259 = (struct avr_property_record *) ap;
2260 const struct avr_property_record *b
2261 = (struct avr_property_record *) bp;
2262
2263 if (a->offset != b->offset)
2264 return (a->offset - b->offset);
2265
2266 if (a->section != b->section)
2267 return (bfd_get_section_vma (a->section->owner, a->section)
2268 - bfd_get_section_vma (b->section->owner, b->section));
2269
2270 return (a->type - b->type);
2271 }
2272
2273 /* Load all of the avr property sections from all of the bfd objects
2274 referenced from LINK_INFO. All of the records within each property
2275 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2276 specific data of the appropriate section. */
2277
2278 static void
2279 avr_load_all_property_sections (struct bfd_link_info *link_info)
2280 {
2281 bfd *abfd;
2282 asection *sec;
2283
2284 /* Initialize the per-section relaxation info. */
2285 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2286 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2287 {
2288 init_avr_relax_info (sec);
2289 }
2290
2291 /* Load the descriptor tables from .avr.prop sections. */
2292 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2293 {
2294 struct avr_property_record_list *r_list;
2295
2296 r_list = avr_elf32_load_property_records (abfd);
2297 if (r_list != NULL)
2298 avr_elf32_assign_records_to_sections (r_list);
2299
2300 free (r_list);
2301 }
2302
2303 /* Now, for every section, ensure that the descriptor list in the
2304 relaxation data is sorted by ascending offset within the section. */
2305 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2306 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2307 {
2308 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
2309 if (relax_info && relax_info->records.count > 0)
2310 {
2311 unsigned int i;
2312
2313 qsort (relax_info->records.items,
2314 relax_info->records.count,
2315 sizeof (struct avr_property_record),
2316 avr_property_record_compare);
2317
2318 /* For debug purposes, list all the descriptors. */
2319 for (i = 0; i < relax_info->records.count; ++i)
2320 {
2321 switch (relax_info->records.items [i].type)
2322 {
2323 case RECORD_ORG:
2324 break;
2325 case RECORD_ORG_AND_FILL:
2326 break;
2327 case RECORD_ALIGN:
2328 break;
2329 case RECORD_ALIGN_AND_FILL:
2330 break;
2331 };
2332 }
2333 }
2334 }
2335 }
2336
2337 /* This function handles relaxing for the avr.
2338 Many important relaxing opportunities within functions are already
2339 realized by the compiler itself.
2340 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2341 and jump -> rjmp (safes also 2 bytes).
2342 As well we now optimize seqences of
2343 - call/rcall function
2344 - ret
2345 to yield
2346 - jmp/rjmp function
2347 - ret
2348 . In case that within a sequence
2349 - jmp/rjmp label
2350 - ret
2351 the ret could no longer be reached it is optimized away. In order
2352 to check if the ret is no longer needed, it is checked that the ret's address
2353 is not the target of a branch or jump within the same section, it is checked
2354 that there is no skip instruction before the jmp/rjmp and that there
2355 is no local or global label place at the address of the ret.
2356
2357 We refrain from relaxing within sections ".vectors" and
2358 ".jumptables" in order to maintain the position of the instructions.
2359 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2360 if possible. (In future one could possibly use the space of the nop
2361 for the first instruction of the irq service function.
2362
2363 The .jumptables sections is meant to be used for a future tablejump variant
2364 for the devices with 3-byte program counter where the table itself
2365 contains 4-byte jump instructions whose relative offset must not
2366 be changed. */
2367
2368 static bfd_boolean
2369 elf32_avr_relax_section (bfd *abfd,
2370 asection *sec,
2371 struct bfd_link_info *link_info,
2372 bfd_boolean *again)
2373 {
2374 Elf_Internal_Shdr *symtab_hdr;
2375 Elf_Internal_Rela *internal_relocs;
2376 Elf_Internal_Rela *irel, *irelend;
2377 bfd_byte *contents = NULL;
2378 Elf_Internal_Sym *isymbuf = NULL;
2379 struct elf32_avr_link_hash_table *htab;
2380 static bfd_boolean relaxation_initialised = FALSE;
2381
2382 if (!relaxation_initialised)
2383 {
2384 relaxation_initialised = TRUE;
2385
2386 /* Load entries from the .avr.prop sections. */
2387 avr_load_all_property_sections (link_info);
2388 }
2389
2390 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2391 relaxing. Such shrinking can cause issues for the sections such
2392 as .vectors and .jumptables. Instead the unused bytes should be
2393 filled with nop instructions. */
2394 bfd_boolean shrinkable = TRUE;
2395
2396 if (!strcmp (sec->name,".vectors")
2397 || !strcmp (sec->name,".jumptables"))
2398 shrinkable = FALSE;
2399
2400 if (bfd_link_relocatable (link_info))
2401 (*link_info->callbacks->einfo)
2402 (_("%P%F: --relax and -r may not be used together\n"));
2403
2404 htab = avr_link_hash_table (link_info);
2405 if (htab == NULL)
2406 return FALSE;
2407
2408 /* Assume nothing changes. */
2409 *again = FALSE;
2410
2411 if ((!htab->no_stubs) && (sec == htab->stub_sec))
2412 {
2413 /* We are just relaxing the stub section.
2414 Let's calculate the size needed again. */
2415 bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
2416
2417 if (debug_relax)
2418 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2419 (int) last_estimated_stub_section_size);
2420
2421 elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
2422 link_info, FALSE);
2423
2424 /* Check if the number of trampolines changed. */
2425 if (last_estimated_stub_section_size != htab->stub_sec->size)
2426 *again = TRUE;
2427
2428 if (debug_relax)
2429 printf ("Size of stub section after this pass: %i\n",
2430 (int) htab->stub_sec->size);
2431
2432 return TRUE;
2433 }
2434
2435 /* We don't have to do anything for a relocatable link, if
2436 this section does not have relocs, or if this is not a
2437 code section. */
2438 if (bfd_link_relocatable (link_info)
2439 || (sec->flags & SEC_RELOC) == 0
2440 || sec->reloc_count == 0
2441 || (sec->flags & SEC_CODE) == 0)
2442 return TRUE;
2443
2444 /* Check if the object file to relax uses internal symbols so that we
2445 could fix up the relocations. */
2446 if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
2447 return TRUE;
2448
2449 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2450
2451 /* Get a copy of the native relocations. */
2452 internal_relocs = (_bfd_elf_link_read_relocs
2453 (abfd, sec, NULL, NULL, link_info->keep_memory));
2454 if (internal_relocs == NULL)
2455 goto error_return;
2456
2457 /* Walk through the relocs looking for relaxing opportunities. */
2458 irelend = internal_relocs + sec->reloc_count;
2459 for (irel = internal_relocs; irel < irelend; irel++)
2460 {
2461 bfd_vma symval;
2462
2463 if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
2464 && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
2465 && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
2466 continue;
2467
2468 /* Get the section contents if we haven't done so already. */
2469 if (contents == NULL)
2470 {
2471 /* Get cached copy if it exists. */
2472 if (elf_section_data (sec)->this_hdr.contents != NULL)
2473 contents = elf_section_data (sec)->this_hdr.contents;
2474 else
2475 {
2476 /* Go get them off disk. */
2477 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2478 goto error_return;
2479 }
2480 }
2481
2482 /* Read this BFD's local symbols if we haven't done so already. */
2483 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2484 {
2485 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2486 if (isymbuf == NULL)
2487 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2488 symtab_hdr->sh_info, 0,
2489 NULL, NULL, NULL);
2490 if (isymbuf == NULL)
2491 goto error_return;
2492 }
2493
2494
2495 /* Get the value of the symbol referred to by the reloc. */
2496 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2497 {
2498 /* A local symbol. */
2499 Elf_Internal_Sym *isym;
2500 asection *sym_sec;
2501
2502 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2503 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2504 symval = isym->st_value;
2505 /* If the reloc is absolute, it will not have
2506 a symbol or section associated with it. */
2507 if (sym_sec)
2508 symval += sym_sec->output_section->vma
2509 + sym_sec->output_offset;
2510 }
2511 else
2512 {
2513 unsigned long indx;
2514 struct elf_link_hash_entry *h;
2515
2516 /* An external symbol. */
2517 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2518 h = elf_sym_hashes (abfd)[indx];
2519 BFD_ASSERT (h != NULL);
2520 if (h->root.type != bfd_link_hash_defined
2521 && h->root.type != bfd_link_hash_defweak)
2522 /* This appears to be a reference to an undefined
2523 symbol. Just ignore it--it will be caught by the
2524 regular reloc processing. */
2525 continue;
2526
2527 symval = (h->root.u.def.value
2528 + h->root.u.def.section->output_section->vma
2529 + h->root.u.def.section->output_offset);
2530 }
2531
2532 /* For simplicity of coding, we are going to modify the section
2533 contents, the section relocs, and the BFD symbol table. We
2534 must tell the rest of the code not to free up this
2535 information. It would be possible to instead create a table
2536 of changes which have to be made, as is done in coff-mips.c;
2537 that would be more work, but would require less memory when
2538 the linker is run. */
2539 switch (ELF32_R_TYPE (irel->r_info))
2540 {
2541 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2542 pc-relative rcall/rjmp. */
2543 case R_AVR_CALL:
2544 {
2545 bfd_vma value = symval + irel->r_addend;
2546 bfd_vma dot, gap;
2547 int distance_short_enough = 0;
2548
2549 /* Get the address of this instruction. */
2550 dot = (sec->output_section->vma
2551 + sec->output_offset + irel->r_offset);
2552
2553 /* Compute the distance from this insn to the branch target. */
2554 gap = value - dot;
2555
2556 /* Check if the gap falls in the range that can be accommodated
2557 in 13bits signed (It is 12bits when encoded, as we deal with
2558 word addressing). */
2559 if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095))
2560 distance_short_enough = 1;
2561 /* If shrinkable, then we can check for a range of distance which
2562 is two bytes farther on both the directions because the call
2563 or jump target will be closer by two bytes after the
2564 relaxation. */
2565 else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097))
2566 distance_short_enough = 1;
2567
2568 /* Here we handle the wrap-around case. E.g. for a 16k device
2569 we could use a rjmp to jump from address 0x100 to 0x3d00!
2570 In order to make this work properly, we need to fill the
2571 vaiable avr_pc_wrap_around with the appropriate value.
2572 I.e. 0x4000 for a 16k device. */
2573 {
2574 /* Shrinking the code size makes the gaps larger in the
2575 case of wrap-arounds. So we use a heuristical safety
2576 margin to avoid that during relax the distance gets
2577 again too large for the short jumps. Let's assume
2578 a typical code-size reduction due to relax for a
2579 16k device of 600 bytes. So let's use twice the
2580 typical value as safety margin. */
2581 int rgap;
2582 int safety_margin;
2583
2584 int assumed_shrink = 600;
2585 if (avr_pc_wrap_around > 0x4000)
2586 assumed_shrink = 900;
2587
2588 safety_margin = 2 * assumed_shrink;
2589
2590 rgap = avr_relative_distance_considering_wrap_around (gap);
2591
2592 if (rgap >= (-4092 + safety_margin)
2593 && rgap <= (4094 - safety_margin))
2594 distance_short_enough = 1;
2595 }
2596
2597 if (distance_short_enough)
2598 {
2599 unsigned char code_msb;
2600 unsigned char code_lsb;
2601
2602 if (debug_relax)
2603 printf ("shrinking jump/call instruction at address 0x%x"
2604 " in section %s\n\n",
2605 (int) dot, sec->name);
2606
2607 /* Note that we've changed the relocs, section contents,
2608 etc. */
2609 elf_section_data (sec)->relocs = internal_relocs;
2610 elf_section_data (sec)->this_hdr.contents = contents;
2611 symtab_hdr->contents = (unsigned char *) isymbuf;
2612
2613 /* Get the instruction code for relaxing. */
2614 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
2615 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2616
2617 /* Mask out the relocation bits. */
2618 code_msb &= 0x94;
2619 code_lsb &= 0x0E;
2620 if (code_msb == 0x94 && code_lsb == 0x0E)
2621 {
2622 /* we are changing call -> rcall . */
2623 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2624 bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
2625 }
2626 else if (code_msb == 0x94 && code_lsb == 0x0C)
2627 {
2628 /* we are changeing jump -> rjmp. */
2629 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2630 bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
2631 }
2632 else
2633 abort ();
2634
2635 /* Fix the relocation's type. */
2636 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2637 R_AVR_13_PCREL);
2638
2639 /* We should not modify the ordering if 'shrinkable' is
2640 FALSE. */
2641 if (!shrinkable)
2642 {
2643 /* Let's insert a nop. */
2644 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
2645 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
2646 }
2647 else
2648 {
2649 /* Delete two bytes of data. */
2650 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2651 irel->r_offset + 2, 2))
2652 goto error_return;
2653
2654 /* That will change things, so, we should relax again.
2655 Note that this is not required, and it may be slow. */
2656 *again = TRUE;
2657 }
2658 }
2659 }
2660
2661 default:
2662 {
2663 unsigned char code_msb;
2664 unsigned char code_lsb;
2665 bfd_vma dot;
2666
2667 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2668 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
2669
2670 /* Get the address of this instruction. */
2671 dot = (sec->output_section->vma
2672 + sec->output_offset + irel->r_offset);
2673
2674 /* Here we look for rcall/ret or call/ret sequences that could be
2675 safely replaced by rjmp/ret or jmp/ret. */
2676 if (((code_msb & 0xf0) == 0xd0)
2677 && avr_replace_call_ret_sequences)
2678 {
2679 /* This insn is a rcall. */
2680 unsigned char next_insn_msb = 0;
2681 unsigned char next_insn_lsb = 0;
2682
2683 if (irel->r_offset + 3 < sec->size)
2684 {
2685 next_insn_msb =
2686 bfd_get_8 (abfd, contents + irel->r_offset + 3);
2687 next_insn_lsb =
2688 bfd_get_8 (abfd, contents + irel->r_offset + 2);
2689 }
2690
2691 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2692 {
2693 /* The next insn is a ret. We now convert the rcall insn
2694 into a rjmp instruction. */
2695 code_msb &= 0xef;
2696 bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
2697 if (debug_relax)
2698 printf ("converted rcall/ret sequence at address 0x%x"
2699 " into rjmp/ret sequence. Section is %s\n\n",
2700 (int) dot, sec->name);
2701 *again = TRUE;
2702 break;
2703 }
2704 }
2705 else if ((0x94 == (code_msb & 0xfe))
2706 && (0x0e == (code_lsb & 0x0e))
2707 && avr_replace_call_ret_sequences)
2708 {
2709 /* This insn is a call. */
2710 unsigned char next_insn_msb = 0;
2711 unsigned char next_insn_lsb = 0;
2712
2713 if (irel->r_offset + 5 < sec->size)
2714 {
2715 next_insn_msb =
2716 bfd_get_8 (abfd, contents + irel->r_offset + 5);
2717 next_insn_lsb =
2718 bfd_get_8 (abfd, contents + irel->r_offset + 4);
2719 }
2720
2721 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2722 {
2723 /* The next insn is a ret. We now convert the call insn
2724 into a jmp instruction. */
2725
2726 code_lsb &= 0xfd;
2727 bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
2728 if (debug_relax)
2729 printf ("converted call/ret sequence at address 0x%x"
2730 " into jmp/ret sequence. Section is %s\n\n",
2731 (int) dot, sec->name);
2732 *again = TRUE;
2733 break;
2734 }
2735 }
2736 else if ((0xc0 == (code_msb & 0xf0))
2737 || ((0x94 == (code_msb & 0xfe))
2738 && (0x0c == (code_lsb & 0x0e))))
2739 {
2740 /* This insn is a rjmp or a jmp. */
2741 unsigned char next_insn_msb = 0;
2742 unsigned char next_insn_lsb = 0;
2743 int insn_size;
2744
2745 if (0xc0 == (code_msb & 0xf0))
2746 insn_size = 2; /* rjmp insn */
2747 else
2748 insn_size = 4; /* jmp insn */
2749
2750 if (irel->r_offset + insn_size + 1 < sec->size)
2751 {
2752 next_insn_msb =
2753 bfd_get_8 (abfd, contents + irel->r_offset
2754 + insn_size + 1);
2755 next_insn_lsb =
2756 bfd_get_8 (abfd, contents + irel->r_offset
2757 + insn_size);
2758 }
2759
2760 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2761 {
2762 /* The next insn is a ret. We possibly could delete
2763 this ret. First we need to check for preceding
2764 sbis/sbic/sbrs or cpse "skip" instructions. */
2765
2766 int there_is_preceding_non_skip_insn = 1;
2767 bfd_vma address_of_ret;
2768
2769 address_of_ret = dot + insn_size;
2770
2771 if (debug_relax && (insn_size == 2))
2772 printf ("found rjmp / ret sequence at address 0x%x\n",
2773 (int) dot);
2774 if (debug_relax && (insn_size == 4))
2775 printf ("found jmp / ret sequence at address 0x%x\n",
2776 (int) dot);
2777
2778 /* We have to make sure that there is a preceding insn. */
2779 if (irel->r_offset >= 2)
2780 {
2781 unsigned char preceding_msb;
2782 unsigned char preceding_lsb;
2783
2784 preceding_msb =
2785 bfd_get_8 (abfd, contents + irel->r_offset - 1);
2786 preceding_lsb =
2787 bfd_get_8 (abfd, contents + irel->r_offset - 2);
2788
2789 /* sbic. */
2790 if (0x99 == preceding_msb)
2791 there_is_preceding_non_skip_insn = 0;
2792
2793 /* sbis. */
2794 if (0x9b == preceding_msb)
2795 there_is_preceding_non_skip_insn = 0;
2796
2797 /* sbrc */
2798 if ((0xfc == (preceding_msb & 0xfe)
2799 && (0x00 == (preceding_lsb & 0x08))))
2800 there_is_preceding_non_skip_insn = 0;
2801
2802 /* sbrs */
2803 if ((0xfe == (preceding_msb & 0xfe)
2804 && (0x00 == (preceding_lsb & 0x08))))
2805 there_is_preceding_non_skip_insn = 0;
2806
2807 /* cpse */
2808 if (0x10 == (preceding_msb & 0xfc))
2809 there_is_preceding_non_skip_insn = 0;
2810
2811 if (there_is_preceding_non_skip_insn == 0)
2812 if (debug_relax)
2813 printf ("preceding skip insn prevents deletion of"
2814 " ret insn at Addy 0x%x in section %s\n",
2815 (int) dot + 2, sec->name);
2816 }
2817 else
2818 {
2819 /* There is no previous instruction. */
2820 there_is_preceding_non_skip_insn = 0;
2821 }
2822
2823 if (there_is_preceding_non_skip_insn)
2824 {
2825 /* We now only have to make sure that there is no
2826 local label defined at the address of the ret
2827 instruction and that there is no local relocation
2828 in this section pointing to the ret. */
2829
2830 int deleting_ret_is_safe = 1;
2831 unsigned int section_offset_of_ret_insn =
2832 irel->r_offset + insn_size;
2833 Elf_Internal_Sym *isym, *isymend;
2834 unsigned int sec_shndx;
2835 struct bfd_section *isec;
2836
2837 sec_shndx =
2838 _bfd_elf_section_from_bfd_section (abfd, sec);
2839
2840 /* Check for local symbols. */
2841 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2842 isymend = isym + symtab_hdr->sh_info;
2843 /* PR 6019: There may not be any local symbols. */
2844 for (; isym != NULL && isym < isymend; isym++)
2845 {
2846 if (isym->st_value == section_offset_of_ret_insn
2847 && isym->st_shndx == sec_shndx)
2848 {
2849 deleting_ret_is_safe = 0;
2850 if (debug_relax)
2851 printf ("local label prevents deletion of ret "
2852 "insn at address 0x%x\n",
2853 (int) dot + insn_size);
2854 }
2855 }
2856
2857 /* Now check for global symbols. */
2858 {
2859 int symcount;
2860 struct elf_link_hash_entry **sym_hashes;
2861 struct elf_link_hash_entry **end_hashes;
2862
2863 symcount = (symtab_hdr->sh_size
2864 / sizeof (Elf32_External_Sym)
2865 - symtab_hdr->sh_info);
2866 sym_hashes = elf_sym_hashes (abfd);
2867 end_hashes = sym_hashes + symcount;
2868 for (; sym_hashes < end_hashes; sym_hashes++)
2869 {
2870 struct elf_link_hash_entry *sym_hash =
2871 *sym_hashes;
2872 if ((sym_hash->root.type == bfd_link_hash_defined
2873 || sym_hash->root.type ==
2874 bfd_link_hash_defweak)
2875 && sym_hash->root.u.def.section == sec
2876 && sym_hash->root.u.def.value == section_offset_of_ret_insn)
2877 {
2878 deleting_ret_is_safe = 0;
2879 if (debug_relax)
2880 printf ("global label prevents deletion of "
2881 "ret insn at address 0x%x\n",
2882 (int) dot + insn_size);
2883 }
2884 }
2885 }
2886
2887 /* Now we check for relocations pointing to ret. */
2888 for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
2889 {
2890 Elf_Internal_Rela *rel;
2891 Elf_Internal_Rela *relend;
2892
2893 rel = elf_section_data (isec)->relocs;
2894 if (rel == NULL)
2895 rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2896
2897 relend = rel + isec->reloc_count;
2898
2899 for (; rel && rel < relend; rel++)
2900 {
2901 bfd_vma reloc_target = 0;
2902
2903 /* Read this BFD's local symbols if we haven't
2904 done so already. */
2905 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2906 {
2907 isymbuf = (Elf_Internal_Sym *)
2908 symtab_hdr->contents;
2909 if (isymbuf == NULL)
2910 isymbuf = bfd_elf_get_elf_syms
2911 (abfd,
2912 symtab_hdr,
2913 symtab_hdr->sh_info, 0,
2914 NULL, NULL, NULL);
2915 if (isymbuf == NULL)
2916 break;
2917 }
2918
2919 /* Get the value of the symbol referred to
2920 by the reloc. */
2921 if (ELF32_R_SYM (rel->r_info)
2922 < symtab_hdr->sh_info)
2923 {
2924 /* A local symbol. */
2925 asection *sym_sec;
2926
2927 isym = isymbuf
2928 + ELF32_R_SYM (rel->r_info);
2929 sym_sec = bfd_section_from_elf_index
2930 (abfd, isym->st_shndx);
2931 symval = isym->st_value;
2932
2933 /* If the reloc is absolute, it will not
2934 have a symbol or section associated
2935 with it. */
2936
2937 if (sym_sec)
2938 {
2939 symval +=
2940 sym_sec->output_section->vma
2941 + sym_sec->output_offset;
2942 reloc_target = symval + rel->r_addend;
2943 }
2944 else
2945 {
2946 reloc_target = symval + rel->r_addend;
2947 /* Reference symbol is absolute. */
2948 }
2949 }
2950 /* else ... reference symbol is extern. */
2951
2952 if (address_of_ret == reloc_target)
2953 {
2954 deleting_ret_is_safe = 0;
2955 if (debug_relax)
2956 printf ("ret from "
2957 "rjmp/jmp ret sequence at address"
2958 " 0x%x could not be deleted. ret"
2959 " is target of a relocation.\n",
2960 (int) address_of_ret);
2961 break;
2962 }
2963 }
2964 }
2965
2966 if (deleting_ret_is_safe)
2967 {
2968 if (debug_relax)
2969 printf ("unreachable ret instruction "
2970 "at address 0x%x deleted.\n",
2971 (int) dot + insn_size);
2972
2973 /* Delete two bytes of data. */
2974 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2975 irel->r_offset + insn_size, 2))
2976 goto error_return;
2977
2978 /* That will change things, so, we should relax
2979 again. Note that this is not required, and it
2980 may be slow. */
2981 *again = TRUE;
2982 break;
2983 }
2984 }
2985 }
2986 }
2987 break;
2988 }
2989 }
2990 }
2991
2992 if (!*again)
2993 {
2994 /* Look through all the property records in this section to see if
2995 there's any alignment records that can be moved. */
2996 struct avr_relax_info *relax_info;
2997
2998 relax_info = get_avr_relax_info (sec);
2999 if (relax_info->records.count > 0)
3000 {
3001 unsigned int i;
3002
3003 for (i = 0; i < relax_info->records.count; ++i)
3004 {
3005 switch (relax_info->records.items [i].type)
3006 {
3007 case RECORD_ORG:
3008 case RECORD_ORG_AND_FILL:
3009 break;
3010 case RECORD_ALIGN:
3011 case RECORD_ALIGN_AND_FILL:
3012 {
3013 struct avr_property_record *record;
3014 unsigned long bytes_to_align;
3015 int count = 0;
3016
3017 /* Look for alignment directives that have had enough
3018 bytes deleted before them, such that the directive
3019 can be moved backwards and still maintain the
3020 required alignment. */
3021 record = &relax_info->records.items [i];
3022 bytes_to_align
3023 = (unsigned long) (1 << record->data.align.bytes);
3024 while (record->data.align.preceding_deleted >=
3025 bytes_to_align)
3026 {
3027 record->data.align.preceding_deleted
3028 -= bytes_to_align;
3029 count += bytes_to_align;
3030 }
3031
3032 if (count > 0)
3033 {
3034 bfd_vma addr = record->offset;
3035
3036 /* We can delete COUNT bytes and this alignment
3037 directive will still be correctly aligned.
3038 First move the alignment directive, then delete
3039 the bytes. */
3040 record->offset -= count;
3041 elf32_avr_relax_delete_bytes (abfd, sec,
3042 addr - count,
3043 count);
3044 *again = TRUE;
3045 }
3046 }
3047 break;
3048 }
3049 }
3050 }
3051 }
3052
3053 if (contents != NULL
3054 && elf_section_data (sec)->this_hdr.contents != contents)
3055 {
3056 if (! link_info->keep_memory)
3057 free (contents);
3058 else
3059 {
3060 /* Cache the section contents for elf_link_input_bfd. */
3061 elf_section_data (sec)->this_hdr.contents = contents;
3062 }
3063 }
3064
3065 if (internal_relocs != NULL
3066 && elf_section_data (sec)->relocs != internal_relocs)
3067 free (internal_relocs);
3068
3069 return TRUE;
3070
3071 error_return:
3072 if (isymbuf != NULL
3073 && symtab_hdr->contents != (unsigned char *) isymbuf)
3074 free (isymbuf);
3075 if (contents != NULL
3076 && elf_section_data (sec)->this_hdr.contents != contents)
3077 free (contents);
3078 if (internal_relocs != NULL
3079 && elf_section_data (sec)->relocs != internal_relocs)
3080 free (internal_relocs);
3081
3082 return FALSE;
3083 }
3084
3085 /* This is a version of bfd_generic_get_relocated_section_contents
3086 which uses elf32_avr_relocate_section.
3087
3088 For avr it's essentially a cut and paste taken from the H8300 port.
3089 The author of the relaxation support patch for avr had absolutely no
3090 clue what is happening here but found out that this part of the code
3091 seems to be important. */
3092
3093 static bfd_byte *
3094 elf32_avr_get_relocated_section_contents (bfd *output_bfd,
3095 struct bfd_link_info *link_info,
3096 struct bfd_link_order *link_order,
3097 bfd_byte *data,
3098 bfd_boolean relocatable,
3099 asymbol **symbols)
3100 {
3101 Elf_Internal_Shdr *symtab_hdr;
3102 asection *input_section = link_order->u.indirect.section;
3103 bfd *input_bfd = input_section->owner;
3104 asection **sections = NULL;
3105 Elf_Internal_Rela *internal_relocs = NULL;
3106 Elf_Internal_Sym *isymbuf = NULL;
3107
3108 /* We only need to handle the case of relaxing, or of having a
3109 particular set of section contents, specially. */
3110 if (relocatable
3111 || elf_section_data (input_section)->this_hdr.contents == NULL)
3112 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3113 link_order, data,
3114 relocatable,
3115 symbols);
3116 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3117
3118 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3119 (size_t) input_section->size);
3120
3121 if ((input_section->flags & SEC_RELOC) != 0
3122 && input_section->reloc_count > 0)
3123 {
3124 asection **secpp;
3125 Elf_Internal_Sym *isym, *isymend;
3126 bfd_size_type amt;
3127
3128 internal_relocs = (_bfd_elf_link_read_relocs
3129 (input_bfd, input_section, NULL, NULL, FALSE));
3130 if (internal_relocs == NULL)
3131 goto error_return;
3132
3133 if (symtab_hdr->sh_info != 0)
3134 {
3135 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3136 if (isymbuf == NULL)
3137 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3138 symtab_hdr->sh_info, 0,
3139 NULL, NULL, NULL);
3140 if (isymbuf == NULL)
3141 goto error_return;
3142 }
3143
3144 amt = symtab_hdr->sh_info;
3145 amt *= sizeof (asection *);
3146 sections = bfd_malloc (amt);
3147 if (sections == NULL && amt != 0)
3148 goto error_return;
3149
3150 isymend = isymbuf + symtab_hdr->sh_info;
3151 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3152 {
3153 asection *isec;
3154
3155 if (isym->st_shndx == SHN_UNDEF)
3156 isec = bfd_und_section_ptr;
3157 else if (isym->st_shndx == SHN_ABS)
3158 isec = bfd_abs_section_ptr;
3159 else if (isym->st_shndx == SHN_COMMON)
3160 isec = bfd_com_section_ptr;
3161 else
3162 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3163
3164 *secpp = isec;
3165 }
3166
3167 if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
3168 input_section, data, internal_relocs,
3169 isymbuf, sections))
3170 goto error_return;
3171
3172 if (sections != NULL)
3173 free (sections);
3174 if (isymbuf != NULL
3175 && symtab_hdr->contents != (unsigned char *) isymbuf)
3176 free (isymbuf);
3177 if (elf_section_data (input_section)->relocs != internal_relocs)
3178 free (internal_relocs);
3179 }
3180
3181 return data;
3182
3183 error_return:
3184 if (sections != NULL)
3185 free (sections);
3186 if (isymbuf != NULL
3187 && symtab_hdr->contents != (unsigned char *) isymbuf)
3188 free (isymbuf);
3189 if (internal_relocs != NULL
3190 && elf_section_data (input_section)->relocs != internal_relocs)
3191 free (internal_relocs);
3192 return NULL;
3193 }
3194
3195
3196 /* Determines the hash entry name for a particular reloc. It consists of
3197 the identifier of the symbol section and the added reloc addend and
3198 symbol offset relative to the section the symbol is attached to. */
3199
3200 static char *
3201 avr_stub_name (const asection *symbol_section,
3202 const bfd_vma symbol_offset,
3203 const Elf_Internal_Rela *rela)
3204 {
3205 char *stub_name;
3206 bfd_size_type len;
3207
3208 len = 8 + 1 + 8 + 1 + 1;
3209 stub_name = bfd_malloc (len);
3210
3211 sprintf (stub_name, "%08x+%08x",
3212 symbol_section->id & 0xffffffff,
3213 (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
3214
3215 return stub_name;
3216 }
3217
3218
3219 /* Add a new stub entry to the stub hash. Not all fields of the new
3220 stub entry are initialised. */
3221
3222 static struct elf32_avr_stub_hash_entry *
3223 avr_add_stub (const char *stub_name,
3224 struct elf32_avr_link_hash_table *htab)
3225 {
3226 struct elf32_avr_stub_hash_entry *hsh;
3227
3228 /* Enter this entry into the linker stub hash table. */
3229 hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);
3230
3231 if (hsh == NULL)
3232 {
3233 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"),
3234 NULL, stub_name);
3235 return NULL;
3236 }
3237
3238 hsh->stub_offset = 0;
3239 return hsh;
3240 }
3241
3242 /* We assume that there is already space allocated for the stub section
3243 contents and that before building the stubs the section size is
3244 initialized to 0. We assume that within the stub hash table entry,
3245 the absolute position of the jmp target has been written in the
3246 target_value field. We write here the offset of the generated jmp insn
3247 relative to the trampoline section start to the stub_offset entry in
3248 the stub hash table entry. */
3249
3250 static bfd_boolean
3251 avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3252 {
3253 struct elf32_avr_stub_hash_entry *hsh;
3254 struct bfd_link_info *info;
3255 struct elf32_avr_link_hash_table *htab;
3256 bfd *stub_bfd;
3257 bfd_byte *loc;
3258 bfd_vma target;
3259 bfd_vma starget;
3260
3261 /* Basic opcode */
3262 bfd_vma jmp_insn = 0x0000940c;
3263
3264 /* Massage our args to the form they really have. */
3265 hsh = avr_stub_hash_entry (bh);
3266
3267 if (!hsh->is_actually_needed)
3268 return TRUE;
3269
3270 info = (struct bfd_link_info *) in_arg;
3271
3272 htab = avr_link_hash_table (info);
3273 if (htab == NULL)
3274 return FALSE;
3275
3276 target = hsh->target_value;
3277
3278 /* Make a note of the offset within the stubs for this entry. */
3279 hsh->stub_offset = htab->stub_sec->size;
3280 loc = htab->stub_sec->contents + hsh->stub_offset;
3281
3282 stub_bfd = htab->stub_sec->owner;
3283
3284 if (debug_stubs)
3285 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3286 (unsigned int) target,
3287 (unsigned int) hsh->stub_offset);
3288
3289 /* We now have to add the information on the jump target to the bare
3290 opcode bits already set in jmp_insn. */
3291
3292 /* Check for the alignment of the address. */
3293 if (target & 1)
3294 return FALSE;
3295
3296 starget = target >> 1;
3297 jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
3298 bfd_put_16 (stub_bfd, jmp_insn, loc);
3299 bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
3300
3301 htab->stub_sec->size += 4;
3302
3303 /* Now add the entries in the address mapping table if there is still
3304 space left. */
3305 {
3306 unsigned int nr;
3307
3308 nr = htab->amt_entry_cnt + 1;
3309 if (nr <= htab->amt_max_entry_cnt)
3310 {
3311 htab->amt_entry_cnt = nr;
3312
3313 htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
3314 htab->amt_destination_addr[nr - 1] = target;
3315 }
3316 }
3317
3318 return TRUE;
3319 }
3320
3321 static bfd_boolean
3322 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
3323 void *in_arg ATTRIBUTE_UNUSED)
3324 {
3325 struct elf32_avr_stub_hash_entry *hsh;
3326
3327 hsh = avr_stub_hash_entry (bh);
3328 hsh->is_actually_needed = FALSE;
3329
3330 return TRUE;
3331 }
3332
3333 static bfd_boolean
3334 avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3335 {
3336 struct elf32_avr_stub_hash_entry *hsh;
3337 struct elf32_avr_link_hash_table *htab;
3338 int size;
3339
3340 /* Massage our args to the form they really have. */
3341 hsh = avr_stub_hash_entry (bh);
3342 htab = in_arg;
3343
3344 if (hsh->is_actually_needed)
3345 size = 4;
3346 else
3347 size = 0;
3348
3349 htab->stub_sec->size += size;
3350 return TRUE;
3351 }
3352
3353 void
3354 elf32_avr_setup_params (struct bfd_link_info *info,
3355 bfd *avr_stub_bfd,
3356 asection *avr_stub_section,
3357 bfd_boolean no_stubs,
3358 bfd_boolean deb_stubs,
3359 bfd_boolean deb_relax,
3360 bfd_vma pc_wrap_around,
3361 bfd_boolean call_ret_replacement)
3362 {
3363 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3364
3365 if (htab == NULL)
3366 return;
3367 htab->stub_sec = avr_stub_section;
3368 htab->stub_bfd = avr_stub_bfd;
3369 htab->no_stubs = no_stubs;
3370
3371 debug_relax = deb_relax;
3372 debug_stubs = deb_stubs;
3373 avr_pc_wrap_around = pc_wrap_around;
3374 avr_replace_call_ret_sequences = call_ret_replacement;
3375 }
3376
3377
3378 /* Set up various things so that we can make a list of input sections
3379 for each output section included in the link. Returns -1 on error,
3380 0 when no stubs will be needed, and 1 on success. It also sets
3381 information on the stubs bfd and the stub section in the info
3382 struct. */
3383
3384 int
3385 elf32_avr_setup_section_lists (bfd *output_bfd,
3386 struct bfd_link_info *info)
3387 {
3388 bfd *input_bfd;
3389 unsigned int bfd_count;
3390 unsigned int top_id, top_index;
3391 asection *section;
3392 asection **input_list, **list;
3393 bfd_size_type amt;
3394 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3395
3396 if (htab == NULL || htab->no_stubs)
3397 return 0;
3398
3399 /* Count the number of input BFDs and find the top input section id. */
3400 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3401 input_bfd != NULL;
3402 input_bfd = input_bfd->link.next)
3403 {
3404 bfd_count += 1;
3405 for (section = input_bfd->sections;
3406 section != NULL;
3407 section = section->next)
3408 if (top_id < section->id)
3409 top_id = section->id;
3410 }
3411
3412 htab->bfd_count = bfd_count;
3413
3414 /* We can't use output_bfd->section_count here to find the top output
3415 section index as some sections may have been removed, and
3416 strip_excluded_output_sections doesn't renumber the indices. */
3417 for (section = output_bfd->sections, top_index = 0;
3418 section != NULL;
3419 section = section->next)
3420 if (top_index < section->index)
3421 top_index = section->index;
3422
3423 htab->top_index = top_index;
3424 amt = sizeof (asection *) * (top_index + 1);
3425 input_list = bfd_malloc (amt);
3426 htab->input_list = input_list;
3427 if (input_list == NULL)
3428 return -1;
3429
3430 /* For sections we aren't interested in, mark their entries with a
3431 value we can check later. */
3432 list = input_list + top_index;
3433 do
3434 *list = bfd_abs_section_ptr;
3435 while (list-- != input_list);
3436
3437 for (section = output_bfd->sections;
3438 section != NULL;
3439 section = section->next)
3440 if ((section->flags & SEC_CODE) != 0)
3441 input_list[section->index] = NULL;
3442
3443 return 1;
3444 }
3445
3446
3447 /* Read in all local syms for all input bfds, and create hash entries
3448 for export stubs if we are building a multi-subspace shared lib.
3449 Returns -1 on error, 0 otherwise. */
3450
3451 static int
3452 get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
3453 {
3454 unsigned int bfd_indx;
3455 Elf_Internal_Sym *local_syms, **all_local_syms;
3456 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3457 bfd_size_type amt;
3458
3459 if (htab == NULL)
3460 return -1;
3461
3462 /* We want to read in symbol extension records only once. To do this
3463 we need to read in the local symbols in parallel and save them for
3464 later use; so hold pointers to the local symbols in an array. */
3465 amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3466 all_local_syms = bfd_zmalloc (amt);
3467 htab->all_local_syms = all_local_syms;
3468 if (all_local_syms == NULL)
3469 return -1;
3470
3471 /* Walk over all the input BFDs, swapping in local symbols.
3472 If we are creating a shared library, create hash entries for the
3473 export stubs. */
3474 for (bfd_indx = 0;
3475 input_bfd != NULL;
3476 input_bfd = input_bfd->link.next, bfd_indx++)
3477 {
3478 Elf_Internal_Shdr *symtab_hdr;
3479
3480 /* We'll need the symbol table in a second. */
3481 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3482 if (symtab_hdr->sh_info == 0)
3483 continue;
3484
3485 /* We need an array of the local symbols attached to the input bfd. */
3486 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3487 if (local_syms == NULL)
3488 {
3489 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3490 symtab_hdr->sh_info, 0,
3491 NULL, NULL, NULL);
3492 /* Cache them for elf_link_input_bfd. */
3493 symtab_hdr->contents = (unsigned char *) local_syms;
3494 }
3495 if (local_syms == NULL)
3496 return -1;
3497
3498 all_local_syms[bfd_indx] = local_syms;
3499 }
3500
3501 return 0;
3502 }
3503
3504 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3505
3506 bfd_boolean
3507 elf32_avr_size_stubs (bfd *output_bfd,
3508 struct bfd_link_info *info,
3509 bfd_boolean is_prealloc_run)
3510 {
3511 struct elf32_avr_link_hash_table *htab;
3512 int stub_changed = 0;
3513
3514 htab = avr_link_hash_table (info);
3515 if (htab == NULL)
3516 return FALSE;
3517
3518 /* At this point we initialize htab->vector_base
3519 To the start of the text output section. */
3520 htab->vector_base = htab->stub_sec->output_section->vma;
3521
3522 if (get_local_syms (info->input_bfds, info))
3523 {
3524 if (htab->all_local_syms)
3525 goto error_ret_free_local;
3526 return FALSE;
3527 }
3528
3529 if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
3530 {
3531 struct elf32_avr_stub_hash_entry *test;
3532
3533 test = avr_add_stub ("Hugo",htab);
3534 test->target_value = 0x123456;
3535 test->stub_offset = 13;
3536
3537 test = avr_add_stub ("Hugo2",htab);
3538 test->target_value = 0x84210;
3539 test->stub_offset = 14;
3540 }
3541
3542 while (1)
3543 {
3544 bfd *input_bfd;
3545 unsigned int bfd_indx;
3546
3547 /* We will have to re-generate the stub hash table each time anything
3548 in memory has changed. */
3549
3550 bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
3551 for (input_bfd = info->input_bfds, bfd_indx = 0;
3552 input_bfd != NULL;
3553 input_bfd = input_bfd->link.next, bfd_indx++)
3554 {
3555 Elf_Internal_Shdr *symtab_hdr;
3556 asection *section;
3557 Elf_Internal_Sym *local_syms;
3558
3559 /* We'll need the symbol table in a second. */
3560 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3561 if (symtab_hdr->sh_info == 0)
3562 continue;
3563
3564 local_syms = htab->all_local_syms[bfd_indx];
3565
3566 /* Walk over each section attached to the input bfd. */
3567 for (section = input_bfd->sections;
3568 section != NULL;
3569 section = section->next)
3570 {
3571 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3572
3573 /* If there aren't any relocs, then there's nothing more
3574 to do. */
3575 if ((section->flags & SEC_RELOC) == 0
3576 || section->reloc_count == 0)
3577 continue;
3578
3579 /* If this section is a link-once section that will be
3580 discarded, then don't create any stubs. */
3581 if (section->output_section == NULL
3582 || section->output_section->owner != output_bfd)
3583 continue;
3584
3585 /* Get the relocs. */
3586 internal_relocs
3587 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3588 info->keep_memory);
3589 if (internal_relocs == NULL)
3590 goto error_ret_free_local;
3591
3592 /* Now examine each relocation. */
3593 irela = internal_relocs;
3594 irelaend = irela + section->reloc_count;
3595 for (; irela < irelaend; irela++)
3596 {
3597 unsigned int r_type, r_indx;
3598 struct elf32_avr_stub_hash_entry *hsh;
3599 asection *sym_sec;
3600 bfd_vma sym_value;
3601 bfd_vma destination;
3602 struct elf_link_hash_entry *hh;
3603 char *stub_name;
3604
3605 r_type = ELF32_R_TYPE (irela->r_info);
3606 r_indx = ELF32_R_SYM (irela->r_info);
3607
3608 /* Only look for 16 bit GS relocs. No other reloc will need a
3609 stub. */
3610 if (!((r_type == R_AVR_16_PM)
3611 || (r_type == R_AVR_LO8_LDI_GS)
3612 || (r_type == R_AVR_HI8_LDI_GS)))
3613 continue;
3614
3615 /* Now determine the call target, its name, value,
3616 section. */
3617 sym_sec = NULL;
3618 sym_value = 0;
3619 destination = 0;
3620 hh = NULL;
3621 if (r_indx < symtab_hdr->sh_info)
3622 {
3623 /* It's a local symbol. */
3624 Elf_Internal_Sym *sym;
3625 Elf_Internal_Shdr *hdr;
3626 unsigned int shndx;
3627
3628 sym = local_syms + r_indx;
3629 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3630 sym_value = sym->st_value;
3631 shndx = sym->st_shndx;
3632 if (shndx < elf_numsections (input_bfd))
3633 {
3634 hdr = elf_elfsections (input_bfd)[shndx];
3635 sym_sec = hdr->bfd_section;
3636 destination = (sym_value + irela->r_addend
3637 + sym_sec->output_offset
3638 + sym_sec->output_section->vma);
3639 }
3640 }
3641 else
3642 {
3643 /* It's an external symbol. */
3644 int e_indx;
3645
3646 e_indx = r_indx - symtab_hdr->sh_info;
3647 hh = elf_sym_hashes (input_bfd)[e_indx];
3648
3649 while (hh->root.type == bfd_link_hash_indirect
3650 || hh->root.type == bfd_link_hash_warning)
3651 hh = (struct elf_link_hash_entry *)
3652 (hh->root.u.i.link);
3653
3654 if (hh->root.type == bfd_link_hash_defined
3655 || hh->root.type == bfd_link_hash_defweak)
3656 {
3657 sym_sec = hh->root.u.def.section;
3658 sym_value = hh->root.u.def.value;
3659 if (sym_sec->output_section != NULL)
3660 destination = (sym_value + irela->r_addend
3661 + sym_sec->output_offset
3662 + sym_sec->output_section->vma);
3663 }
3664 else if (hh->root.type == bfd_link_hash_undefweak)
3665 {
3666 if (! bfd_link_pic (info))
3667 continue;
3668 }
3669 else if (hh->root.type == bfd_link_hash_undefined)
3670 {
3671 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3672 && (ELF_ST_VISIBILITY (hh->other)
3673 == STV_DEFAULT)))
3674 continue;
3675 }
3676 else
3677 {
3678 bfd_set_error (bfd_error_bad_value);
3679
3680 error_ret_free_internal:
3681 if (elf_section_data (section)->relocs == NULL)
3682 free (internal_relocs);
3683 goto error_ret_free_local;
3684 }
3685 }
3686
3687 if (! avr_stub_is_required_for_16_bit_reloc
3688 (destination - htab->vector_base))
3689 {
3690 if (!is_prealloc_run)
3691 /* We are having a reloc that does't need a stub. */
3692 continue;
3693
3694 /* We don't right now know if a stub will be needed.
3695 Let's rather be on the safe side. */
3696 }
3697
3698 /* Get the name of this stub. */
3699 stub_name = avr_stub_name (sym_sec, sym_value, irela);
3700
3701 if (!stub_name)
3702 goto error_ret_free_internal;
3703
3704
3705 hsh = avr_stub_hash_lookup (&htab->bstab,
3706 stub_name,
3707 FALSE, FALSE);
3708 if (hsh != NULL)
3709 {
3710 /* The proper stub has already been created. Mark it
3711 to be used and write the possibly changed destination
3712 value. */
3713 hsh->is_actually_needed = TRUE;
3714 hsh->target_value = destination;
3715 free (stub_name);
3716 continue;
3717 }
3718
3719 hsh = avr_add_stub (stub_name, htab);
3720 if (hsh == NULL)
3721 {
3722 free (stub_name);
3723 goto error_ret_free_internal;
3724 }
3725
3726 hsh->is_actually_needed = TRUE;
3727 hsh->target_value = destination;
3728
3729 if (debug_stubs)
3730 printf ("Adding stub with destination 0x%x to the"
3731 " hash table.\n", (unsigned int) destination);
3732 if (debug_stubs)
3733 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
3734
3735 stub_changed = TRUE;
3736 }
3737
3738 /* We're done with the internal relocs, free them. */
3739 if (elf_section_data (section)->relocs == NULL)
3740 free (internal_relocs);
3741 }
3742 }
3743
3744 /* Re-Calculate the number of needed stubs. */
3745 htab->stub_sec->size = 0;
3746 bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
3747
3748 if (!stub_changed)
3749 break;
3750
3751 stub_changed = FALSE;
3752 }
3753
3754 free (htab->all_local_syms);
3755 return TRUE;
3756
3757 error_ret_free_local:
3758 free (htab->all_local_syms);
3759 return FALSE;
3760 }
3761
3762
3763 /* Build all the stubs associated with the current output file. The
3764 stubs are kept in a hash table attached to the main linker hash
3765 table. We also set up the .plt entries for statically linked PIC
3766 functions here. This function is called via hppaelf_finish in the
3767 linker. */
3768
3769 bfd_boolean
3770 elf32_avr_build_stubs (struct bfd_link_info *info)
3771 {
3772 asection *stub_sec;
3773 struct bfd_hash_table *table;
3774 struct elf32_avr_link_hash_table *htab;
3775 bfd_size_type total_size = 0;
3776
3777 htab = avr_link_hash_table (info);
3778 if (htab == NULL)
3779 return FALSE;
3780
3781 /* In case that there were several stub sections: */
3782 for (stub_sec = htab->stub_bfd->sections;
3783 stub_sec != NULL;
3784 stub_sec = stub_sec->next)
3785 {
3786 bfd_size_type size;
3787
3788 /* Allocate memory to hold the linker stubs. */
3789 size = stub_sec->size;
3790 total_size += size;
3791
3792 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3793 if (stub_sec->contents == NULL && size != 0)
3794 return FALSE;
3795 stub_sec->size = 0;
3796 }
3797
3798 /* Allocate memory for the adress mapping table. */
3799 htab->amt_entry_cnt = 0;
3800 htab->amt_max_entry_cnt = total_size / 4;
3801 htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
3802 * htab->amt_max_entry_cnt);
3803 htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
3804 * htab->amt_max_entry_cnt );
3805
3806 if (debug_stubs)
3807 printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
3808
3809 /* Build the stubs as directed by the stub hash table. */
3810 table = &htab->bstab;
3811 bfd_hash_traverse (table, avr_build_one_stub, info);
3812
3813 if (debug_stubs)
3814 printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
3815
3816 return TRUE;
3817 }
3818
3819 /* Callback used by QSORT to order relocations AP and BP. */
3820
3821 static int
3822 internal_reloc_compare (const void *ap, const void *bp)
3823 {
3824 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
3825 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
3826
3827 if (a->r_offset != b->r_offset)
3828 return (a->r_offset - b->r_offset);
3829
3830 /* We don't need to sort on these criteria for correctness,
3831 but enforcing a more strict ordering prevents unstable qsort
3832 from behaving differently with different implementations.
3833 Without the code below we get correct but different results
3834 on Solaris 2.7 and 2.8. We would like to always produce the
3835 same results no matter the host. */
3836
3837 if (a->r_info != b->r_info)
3838 return (a->r_info - b->r_info);
3839
3840 return (a->r_addend - b->r_addend);
3841 }
3842
3843 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3844
3845 static bfd_boolean
3846 avr_is_section_for_address (bfd *abfd, asection *section, bfd_vma address)
3847 {
3848 bfd_vma vma;
3849 bfd_size_type size;
3850
3851 vma = bfd_get_section_vma (abfd, section);
3852 if (address < vma)
3853 return FALSE;
3854
3855 size = section->size;
3856 if (address >= vma + size)
3857 return FALSE;
3858
3859 return TRUE;
3860 }
3861
3862 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3863
3864 struct avr_find_section_data
3865 {
3866 /* The address we're looking for. */
3867 bfd_vma address;
3868
3869 /* The section we've found. */
3870 asection *section;
3871 };
3872
3873 /* Helper function to locate the section holding a certain virtual memory
3874 address. This is called via bfd_map_over_sections. The DATA is an
3875 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3876 has been set to the address to search for, and the section field has
3877 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3878 section field in DATA will be set to SECTION. As an optimisation, if
3879 the section field is already non-null then this function does not
3880 perform any checks, and just returns. */
3881
3882 static void
3883 avr_find_section_for_address (bfd *abfd,
3884 asection *section, void *data)
3885 {
3886 struct avr_find_section_data *fs_data
3887 = (struct avr_find_section_data *) data;
3888
3889 /* Return if already found. */
3890 if (fs_data->section != NULL)
3891 return;
3892
3893 /* If this section isn't part of the addressable code content, skip it. */
3894 if ((bfd_get_section_flags (abfd, section) & SEC_ALLOC) == 0
3895 && (bfd_get_section_flags (abfd, section) & SEC_CODE) == 0)
3896 return;
3897
3898 if (avr_is_section_for_address (abfd, section, fs_data->address))
3899 fs_data->section = section;
3900 }
3901
3902 /* Load all of the property records from SEC, a section from ABFD. Return
3903 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
3904 memory for the returned structure, and all of the records pointed too by
3905 the structure are allocated with a single call to malloc, so, only the
3906 pointer returned needs to be free'd. */
3907
3908 static struct avr_property_record_list *
3909 avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
3910 {
3911 char *contents = NULL, *ptr;
3912 bfd_size_type size, mem_size;
3913 bfd_byte version, flags;
3914 uint16_t record_count, i;
3915 struct avr_property_record_list *r_list = NULL;
3916 Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
3917 struct avr_find_section_data fs_data;
3918
3919 fs_data.section = NULL;
3920
3921 size = bfd_get_section_size (sec);
3922 contents = bfd_malloc (size);
3923 bfd_get_section_contents (abfd, sec, contents, 0, size);
3924 ptr = contents;
3925
3926 /* Load the relocations for the '.avr.prop' section if there are any, and
3927 sort them. */
3928 internal_relocs = (_bfd_elf_link_read_relocs
3929 (abfd, sec, NULL, NULL, FALSE));
3930 if (internal_relocs)
3931 qsort (internal_relocs, sec->reloc_count,
3932 sizeof (Elf_Internal_Rela), internal_reloc_compare);
3933
3934 /* There is a header at the start of the property record section SEC, the
3935 format of this header is:
3936 uint8_t : version number
3937 uint8_t : flags
3938 uint16_t : record counter
3939 */
3940
3941 /* Check we have at least got a headers worth of bytes. */
3942 if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
3943 goto load_failed;
3944
3945 version = *((bfd_byte *) ptr);
3946 ptr++;
3947 flags = *((bfd_byte *) ptr);
3948 ptr++;
3949 record_count = *((uint16_t *) ptr);
3950 ptr+=2;
3951 BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
3952
3953 /* Now allocate space for the list structure, and all of the list
3954 elements in a single block. */
3955 mem_size = sizeof (struct avr_property_record_list)
3956 + sizeof (struct avr_property_record) * record_count;
3957 r_list = bfd_malloc (mem_size);
3958 if (r_list == NULL)
3959 goto load_failed;
3960
3961 r_list->version = version;
3962 r_list->flags = flags;
3963 r_list->section = sec;
3964 r_list->record_count = record_count;
3965 r_list->records = (struct avr_property_record *) (&r_list [1]);
3966 size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
3967
3968 /* Check that we understand the version number. There is only one
3969 version number right now, anything else is an error. */
3970 if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
3971 goto load_failed;
3972
3973 rel = internal_relocs;
3974 rel_end = rel + sec->reloc_count;
3975 for (i = 0; i < record_count; ++i)
3976 {
3977 bfd_vma address;
3978
3979 /* Each entry is a 32-bit address, followed by a single byte type.
3980 After that is the type specific data. We must take care to
3981 ensure that we don't read beyond the end of the section data. */
3982 if (size < 5)
3983 goto load_failed;
3984
3985 r_list->records [i].section = NULL;
3986 r_list->records [i].offset = 0;
3987
3988 if (rel)
3989 {
3990 /* The offset of the address within the .avr.prop section. */
3991 size_t offset = ptr - contents;
3992
3993 while (rel < rel_end && rel->r_offset < offset)
3994 ++rel;
3995
3996 if (rel == rel_end)
3997 rel = NULL;
3998 else if (rel->r_offset == offset)
3999 {
4000 /* Find section and section offset. */
4001 unsigned long r_symndx;
4002
4003 asection * rel_sec;
4004 bfd_vma sec_offset;
4005
4006 r_symndx = ELF32_R_SYM (rel->r_info);
4007 rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
4008 sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
4009 + rel->r_addend;
4010
4011 r_list->records [i].section = rel_sec;
4012 r_list->records [i].offset = sec_offset;
4013 }
4014 }
4015
4016 address = *((uint32_t *) ptr);
4017 ptr += 4;
4018 size -= 4;
4019
4020 if (r_list->records [i].section == NULL)
4021 {
4022 /* Try to find section and offset from address. */
4023 if (fs_data.section != NULL
4024 && !avr_is_section_for_address (abfd, fs_data.section,
4025 address))
4026 fs_data.section = NULL;
4027
4028 if (fs_data.section == NULL)
4029 {
4030 fs_data.address = address;
4031 bfd_map_over_sections (abfd, avr_find_section_for_address,
4032 &fs_data);
4033 }
4034
4035 if (fs_data.section == NULL)
4036 {
4037 fprintf (stderr, "Failed to find matching section.\n");
4038 goto load_failed;
4039 }
4040
4041 r_list->records [i].section = fs_data.section;
4042 r_list->records [i].offset
4043 = address - bfd_get_section_vma (abfd, fs_data.section);
4044 }
4045
4046 r_list->records [i].type = *((bfd_byte *) ptr);
4047 ptr += 1;
4048 size -= 1;
4049
4050 switch (r_list->records [i].type)
4051 {
4052 case RECORD_ORG:
4053 /* Nothing else to load. */
4054 break;
4055 case RECORD_ORG_AND_FILL:
4056 /* Just a 4-byte fill to load. */
4057 if (size < 4)
4058 goto load_failed;
4059 r_list->records [i].data.org.fill = *((uint32_t *) ptr);
4060 ptr += 4;
4061 size -= 4;
4062 break;
4063 case RECORD_ALIGN:
4064 /* Just a 4-byte alignment to load. */
4065 if (size < 4)
4066 goto load_failed;
4067 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4068 ptr += 4;
4069 size -= 4;
4070 /* Just initialise PRECEDING_DELETED field, this field is
4071 used during linker relaxation. */
4072 r_list->records [i].data.align.preceding_deleted = 0;
4073 break;
4074 case RECORD_ALIGN_AND_FILL:
4075 /* A 4-byte alignment, and a 4-byte fill to load. */
4076 if (size < 8)
4077 goto load_failed;
4078 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4079 ptr += 4;
4080 r_list->records [i].data.align.fill = *((uint32_t *) ptr);
4081 ptr += 4;
4082 size -= 8;
4083 /* Just initialise PRECEDING_DELETED field, this field is
4084 used during linker relaxation. */
4085 r_list->records [i].data.align.preceding_deleted = 0;
4086 break;
4087 default:
4088 goto load_failed;
4089 }
4090 }
4091
4092 free (contents);
4093 if (elf_section_data (sec)->relocs != internal_relocs)
4094 free (internal_relocs);
4095 return r_list;
4096
4097 load_failed:
4098 if (elf_section_data (sec)->relocs != internal_relocs)
4099 free (internal_relocs);
4100 free (contents);
4101 free (r_list);
4102 return NULL;
4103 }
4104
4105 /* Load all of the property records from ABFD. See
4106 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4107
4108 struct avr_property_record_list *
4109 avr_elf32_load_property_records (bfd *abfd)
4110 {
4111 asection *sec;
4112
4113 /* Find the '.avr.prop' section and load the contents into memory. */
4114 sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
4115 if (sec == NULL)
4116 return NULL;
4117 return avr_elf32_load_records_from_section (abfd, sec);
4118 }
4119
4120 const char *
4121 avr_elf32_property_record_name (struct avr_property_record *rec)
4122 {
4123 const char *str;
4124
4125 switch (rec->type)
4126 {
4127 case RECORD_ORG:
4128 str = "ORG";
4129 break;
4130 case RECORD_ORG_AND_FILL:
4131 str = "ORG+FILL";
4132 break;
4133 case RECORD_ALIGN:
4134 str = "ALIGN";
4135 break;
4136 case RECORD_ALIGN_AND_FILL:
4137 str = "ALIGN+FILL";
4138 break;
4139 default:
4140 str = "unknown";
4141 }
4142
4143 return str;
4144 }
4145
4146
4147 #define ELF_ARCH bfd_arch_avr
4148 #define ELF_TARGET_ID AVR_ELF_DATA
4149 #define ELF_MACHINE_CODE EM_AVR
4150 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4151 #define ELF_MAXPAGESIZE 1
4152
4153 #define TARGET_LITTLE_SYM avr_elf32_vec
4154 #define TARGET_LITTLE_NAME "elf32-avr"
4155
4156 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4157
4158 #define elf_info_to_howto avr_info_to_howto_rela
4159 #define elf_info_to_howto_rel NULL
4160 #define elf_backend_relocate_section elf32_avr_relocate_section
4161 #define elf_backend_can_gc_sections 1
4162 #define elf_backend_rela_normal 1
4163 #define elf_backend_final_write_processing \
4164 bfd_elf_avr_final_write_processing
4165 #define elf_backend_object_p elf32_avr_object_p
4166
4167 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4168 #define bfd_elf32_bfd_get_relocated_section_contents \
4169 elf32_avr_get_relocated_section_contents
4170 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4171
4172 #include "elf32-target.h"
GDB Binutils - Deliverables
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