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[thirdparty/binutils-gdb.git] / bfd / elf32-avr.c
1 /* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999-2020 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
29 /* Enable debugging printout at stdout with this variable. */
30 static bfd_boolean debug_relax = FALSE;
31
32 /* Enable debugging printout at stdout with this variable. */
33 static bfd_boolean debug_stubs = FALSE;
34
35 static bfd_reloc_status_type
36 bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *,
37 asection *, bfd *, char **);
38
39 /* Hash table initialization and handling. Code is taken from the hppa port
40 and adapted to the needs of AVR. */
41
42 /* We use two hash tables to hold information for linking avr objects.
43
44 The first is the elf32_avr_link_hash_table which is derived from the
45 stanard ELF linker hash table. We use this as a place to attach the other
46 hash table and some static information.
47
48 The second is the stub hash table which is derived from the base BFD
49 hash table. The stub hash table holds the information on the linker
50 stubs. */
51
52 struct elf32_avr_stub_hash_entry
53 {
54 /* Base hash table entry structure. */
55 struct bfd_hash_entry bh_root;
56
57 /* Offset within stub_sec of the beginning of this stub. */
58 bfd_vma stub_offset;
59
60 /* Given the symbol's value and its section we can determine its final
61 value when building the stubs (so the stub knows where to jump). */
62 bfd_vma target_value;
63
64 /* This way we could mark stubs to be no longer necessary. */
65 bfd_boolean is_actually_needed;
66 };
67
68 struct elf32_avr_link_hash_table
69 {
70 /* The main hash table. */
71 struct elf_link_hash_table etab;
72
73 /* The stub hash table. */
74 struct bfd_hash_table bstab;
75
76 bfd_boolean no_stubs;
77
78 /* Linker stub bfd. */
79 bfd *stub_bfd;
80
81 /* The stub section. */
82 asection *stub_sec;
83
84 /* Usually 0, unless we are generating code for a bootloader. Will
85 be initialized by elf32_avr_size_stubs to the vma offset of the
86 output section associated with the stub section. */
87 bfd_vma vector_base;
88
89 /* Assorted information used by elf32_avr_size_stubs. */
90 unsigned int bfd_count;
91 unsigned int top_index;
92 asection ** input_list;
93 Elf_Internal_Sym ** all_local_syms;
94
95 /* Tables for mapping vma beyond the 128k boundary to the address of the
96 corresponding stub. (AMT)
97 "amt_max_entry_cnt" reflects the number of entries that memory is allocated
98 for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
99 "amt_entry_cnt" informs how many of these entries actually contain
100 useful data. */
101 unsigned int amt_entry_cnt;
102 unsigned int amt_max_entry_cnt;
103 bfd_vma * amt_stub_offsets;
104 bfd_vma * amt_destination_addr;
105 };
106
107 /* Various hash macros and functions. */
108 #define avr_link_hash_table(p) \
109 /* PR 3874: Check that we have an AVR style hash table before using it. */\
110 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
111 == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL)
112
113 #define avr_stub_hash_entry(ent) \
114 ((struct elf32_avr_stub_hash_entry *)(ent))
115
116 #define avr_stub_hash_lookup(table, string, create, copy) \
117 ((struct elf32_avr_stub_hash_entry *) \
118 bfd_hash_lookup ((table), (string), (create), (copy)))
119
120 static reloc_howto_type elf_avr_howto_table[] =
121 {
122 HOWTO (R_AVR_NONE, /* type */
123 0, /* rightshift */
124 3, /* size (0 = byte, 1 = short, 2 = long) */
125 0, /* bitsize */
126 FALSE, /* pc_relative */
127 0, /* bitpos */
128 complain_overflow_dont, /* complain_on_overflow */
129 bfd_elf_generic_reloc, /* special_function */
130 "R_AVR_NONE", /* name */
131 FALSE, /* partial_inplace */
132 0, /* src_mask */
133 0, /* dst_mask */
134 FALSE), /* pcrel_offset */
135
136 HOWTO (R_AVR_32, /* type */
137 0, /* rightshift */
138 2, /* size (0 = byte, 1 = short, 2 = long) */
139 32, /* bitsize */
140 FALSE, /* pc_relative */
141 0, /* bitpos */
142 complain_overflow_bitfield, /* complain_on_overflow */
143 bfd_elf_generic_reloc, /* special_function */
144 "R_AVR_32", /* name */
145 FALSE, /* partial_inplace */
146 0xffffffff, /* src_mask */
147 0xffffffff, /* dst_mask */
148 FALSE), /* pcrel_offset */
149
150 /* A 7 bit PC relative relocation. */
151 HOWTO (R_AVR_7_PCREL, /* type */
152 1, /* rightshift */
153 1, /* size (0 = byte, 1 = short, 2 = long) */
154 7, /* bitsize */
155 TRUE, /* pc_relative */
156 3, /* bitpos */
157 complain_overflow_bitfield, /* complain_on_overflow */
158 bfd_elf_generic_reloc, /* special_function */
159 "R_AVR_7_PCREL", /* name */
160 FALSE, /* partial_inplace */
161 0xffff, /* src_mask */
162 0xffff, /* dst_mask */
163 TRUE), /* pcrel_offset */
164
165 /* A 13 bit PC relative relocation. */
166 HOWTO (R_AVR_13_PCREL, /* type */
167 1, /* rightshift */
168 1, /* size (0 = byte, 1 = short, 2 = long) */
169 13, /* bitsize */
170 TRUE, /* pc_relative */
171 0, /* bitpos */
172 complain_overflow_bitfield, /* complain_on_overflow */
173 bfd_elf_generic_reloc, /* special_function */
174 "R_AVR_13_PCREL", /* name */
175 FALSE, /* partial_inplace */
176 0xfff, /* src_mask */
177 0xfff, /* dst_mask */
178 TRUE), /* pcrel_offset */
179
180 /* A 16 bit absolute relocation. */
181 HOWTO (R_AVR_16, /* type */
182 0, /* rightshift */
183 1, /* size (0 = byte, 1 = short, 2 = long) */
184 16, /* bitsize */
185 FALSE, /* pc_relative */
186 0, /* bitpos */
187 complain_overflow_dont, /* complain_on_overflow */
188 bfd_elf_generic_reloc, /* special_function */
189 "R_AVR_16", /* name */
190 FALSE, /* partial_inplace */
191 0xffff, /* src_mask */
192 0xffff, /* dst_mask */
193 FALSE), /* pcrel_offset */
194
195 /* A 16 bit absolute relocation for command address
196 Will be changed when linker stubs are needed. */
197 HOWTO (R_AVR_16_PM, /* type */
198 1, /* rightshift */
199 1, /* size (0 = byte, 1 = short, 2 = long) */
200 16, /* bitsize */
201 FALSE, /* pc_relative */
202 0, /* bitpos */
203 complain_overflow_bitfield, /* complain_on_overflow */
204 bfd_elf_generic_reloc, /* special_function */
205 "R_AVR_16_PM", /* name */
206 FALSE, /* partial_inplace */
207 0xffff, /* src_mask */
208 0xffff, /* dst_mask */
209 FALSE), /* pcrel_offset */
210 /* A low 8 bit absolute relocation of 16 bit address.
211 For LDI command. */
212 HOWTO (R_AVR_LO8_LDI, /* type */
213 0, /* rightshift */
214 1, /* size (0 = byte, 1 = short, 2 = long) */
215 8, /* bitsize */
216 FALSE, /* pc_relative */
217 0, /* bitpos */
218 complain_overflow_dont, /* complain_on_overflow */
219 bfd_elf_generic_reloc, /* special_function */
220 "R_AVR_LO8_LDI", /* name */
221 FALSE, /* partial_inplace */
222 0xffff, /* src_mask */
223 0xffff, /* dst_mask */
224 FALSE), /* pcrel_offset */
225 /* A high 8 bit absolute relocation of 16 bit address.
226 For LDI command. */
227 HOWTO (R_AVR_HI8_LDI, /* type */
228 8, /* rightshift */
229 1, /* size (0 = byte, 1 = short, 2 = long) */
230 8, /* bitsize */
231 FALSE, /* pc_relative */
232 0, /* bitpos */
233 complain_overflow_dont, /* complain_on_overflow */
234 bfd_elf_generic_reloc, /* special_function */
235 "R_AVR_HI8_LDI", /* name */
236 FALSE, /* partial_inplace */
237 0xffff, /* src_mask */
238 0xffff, /* dst_mask */
239 FALSE), /* pcrel_offset */
240 /* A high 6 bit absolute relocation of 22 bit address.
241 For LDI command. As well second most significant 8 bit value of
242 a 32 bit link-time constant. */
243 HOWTO (R_AVR_HH8_LDI, /* type */
244 16, /* rightshift */
245 1, /* size (0 = byte, 1 = short, 2 = long) */
246 8, /* bitsize */
247 FALSE, /* pc_relative */
248 0, /* bitpos */
249 complain_overflow_dont, /* complain_on_overflow */
250 bfd_elf_generic_reloc, /* special_function */
251 "R_AVR_HH8_LDI", /* name */
252 FALSE, /* partial_inplace */
253 0xffff, /* src_mask */
254 0xffff, /* dst_mask */
255 FALSE), /* pcrel_offset */
256 /* A negative low 8 bit absolute relocation of 16 bit address.
257 For LDI command. */
258 HOWTO (R_AVR_LO8_LDI_NEG, /* type */
259 0, /* rightshift */
260 1, /* size (0 = byte, 1 = short, 2 = long) */
261 8, /* bitsize */
262 FALSE, /* pc_relative */
263 0, /* bitpos */
264 complain_overflow_dont, /* complain_on_overflow */
265 bfd_elf_generic_reloc, /* special_function */
266 "R_AVR_LO8_LDI_NEG", /* name */
267 FALSE, /* partial_inplace */
268 0xffff, /* src_mask */
269 0xffff, /* dst_mask */
270 FALSE), /* pcrel_offset */
271 /* A negative high 8 bit absolute relocation of 16 bit address.
272 For LDI command. */
273 HOWTO (R_AVR_HI8_LDI_NEG, /* type */
274 8, /* rightshift */
275 1, /* size (0 = byte, 1 = short, 2 = long) */
276 8, /* bitsize */
277 FALSE, /* pc_relative */
278 0, /* bitpos */
279 complain_overflow_dont, /* complain_on_overflow */
280 bfd_elf_generic_reloc, /* special_function */
281 "R_AVR_HI8_LDI_NEG", /* name */
282 FALSE, /* partial_inplace */
283 0xffff, /* src_mask */
284 0xffff, /* dst_mask */
285 FALSE), /* pcrel_offset */
286 /* A negative high 6 bit absolute relocation of 22 bit address.
287 For LDI command. */
288 HOWTO (R_AVR_HH8_LDI_NEG, /* type */
289 16, /* rightshift */
290 1, /* size (0 = byte, 1 = short, 2 = long) */
291 8, /* bitsize */
292 FALSE, /* pc_relative */
293 0, /* bitpos */
294 complain_overflow_dont, /* complain_on_overflow */
295 bfd_elf_generic_reloc, /* special_function */
296 "R_AVR_HH8_LDI_NEG", /* name */
297 FALSE, /* partial_inplace */
298 0xffff, /* src_mask */
299 0xffff, /* dst_mask */
300 FALSE), /* pcrel_offset */
301 /* A low 8 bit absolute relocation of 24 bit program memory address.
302 For LDI command. Will not be changed when linker stubs are needed. */
303 HOWTO (R_AVR_LO8_LDI_PM, /* type */
304 1, /* rightshift */
305 1, /* size (0 = byte, 1 = short, 2 = long) */
306 8, /* bitsize */
307 FALSE, /* pc_relative */
308 0, /* bitpos */
309 complain_overflow_dont, /* complain_on_overflow */
310 bfd_elf_generic_reloc, /* special_function */
311 "R_AVR_LO8_LDI_PM", /* name */
312 FALSE, /* partial_inplace */
313 0xffff, /* src_mask */
314 0xffff, /* dst_mask */
315 FALSE), /* pcrel_offset */
316 /* A low 8 bit absolute relocation of 24 bit program memory address.
317 For LDI command. Will not be changed when linker stubs are needed. */
318 HOWTO (R_AVR_HI8_LDI_PM, /* type */
319 9, /* rightshift */
320 1, /* size (0 = byte, 1 = short, 2 = long) */
321 8, /* bitsize */
322 FALSE, /* pc_relative */
323 0, /* bitpos */
324 complain_overflow_dont, /* complain_on_overflow */
325 bfd_elf_generic_reloc, /* special_function */
326 "R_AVR_HI8_LDI_PM", /* name */
327 FALSE, /* partial_inplace */
328 0xffff, /* src_mask */
329 0xffff, /* dst_mask */
330 FALSE), /* pcrel_offset */
331 /* A low 8 bit absolute relocation of 24 bit program memory address.
332 For LDI command. Will not be changed when linker stubs are needed. */
333 HOWTO (R_AVR_HH8_LDI_PM, /* type */
334 17, /* rightshift */
335 1, /* size (0 = byte, 1 = short, 2 = long) */
336 8, /* bitsize */
337 FALSE, /* pc_relative */
338 0, /* bitpos */
339 complain_overflow_dont, /* complain_on_overflow */
340 bfd_elf_generic_reloc, /* special_function */
341 "R_AVR_HH8_LDI_PM", /* name */
342 FALSE, /* partial_inplace */
343 0xffff, /* src_mask */
344 0xffff, /* dst_mask */
345 FALSE), /* pcrel_offset */
346 /* A low 8 bit absolute relocation of 24 bit program memory address.
347 For LDI command. Will not be changed when linker stubs are needed. */
348 HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */
349 1, /* rightshift */
350 1, /* size (0 = byte, 1 = short, 2 = long) */
351 8, /* bitsize */
352 FALSE, /* pc_relative */
353 0, /* bitpos */
354 complain_overflow_dont, /* complain_on_overflow */
355 bfd_elf_generic_reloc, /* special_function */
356 "R_AVR_LO8_LDI_PM_NEG", /* name */
357 FALSE, /* partial_inplace */
358 0xffff, /* src_mask */
359 0xffff, /* dst_mask */
360 FALSE), /* pcrel_offset */
361 /* A low 8 bit absolute relocation of 24 bit program memory address.
362 For LDI command. Will not be changed when linker stubs are needed. */
363 HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */
364 9, /* rightshift */
365 1, /* size (0 = byte, 1 = short, 2 = long) */
366 8, /* bitsize */
367 FALSE, /* pc_relative */
368 0, /* bitpos */
369 complain_overflow_dont, /* complain_on_overflow */
370 bfd_elf_generic_reloc, /* special_function */
371 "R_AVR_HI8_LDI_PM_NEG", /* name */
372 FALSE, /* partial_inplace */
373 0xffff, /* src_mask */
374 0xffff, /* dst_mask */
375 FALSE), /* pcrel_offset */
376 /* A low 8 bit absolute relocation of 24 bit program memory address.
377 For LDI command. Will not be changed when linker stubs are needed. */
378 HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */
379 17, /* rightshift */
380 1, /* size (0 = byte, 1 = short, 2 = long) */
381 8, /* bitsize */
382 FALSE, /* pc_relative */
383 0, /* bitpos */
384 complain_overflow_dont, /* complain_on_overflow */
385 bfd_elf_generic_reloc, /* special_function */
386 "R_AVR_HH8_LDI_PM_NEG", /* name */
387 FALSE, /* partial_inplace */
388 0xffff, /* src_mask */
389 0xffff, /* dst_mask */
390 FALSE), /* pcrel_offset */
391 /* Relocation for CALL command in ATmega. */
392 HOWTO (R_AVR_CALL, /* type */
393 1, /* rightshift */
394 2, /* size (0 = byte, 1 = short, 2 = long) */
395 23, /* bitsize */
396 FALSE, /* pc_relative */
397 0, /* bitpos */
398 complain_overflow_dont,/* complain_on_overflow */
399 bfd_elf_generic_reloc, /* special_function */
400 "R_AVR_CALL", /* name */
401 FALSE, /* partial_inplace */
402 0xffffffff, /* src_mask */
403 0xffffffff, /* dst_mask */
404 FALSE), /* pcrel_offset */
405 /* A 16 bit absolute relocation of 16 bit address.
406 For LDI command. */
407 HOWTO (R_AVR_LDI, /* type */
408 0, /* rightshift */
409 1, /* size (0 = byte, 1 = short, 2 = long) */
410 16, /* bitsize */
411 FALSE, /* pc_relative */
412 0, /* bitpos */
413 complain_overflow_dont,/* complain_on_overflow */
414 bfd_elf_generic_reloc, /* special_function */
415 "R_AVR_LDI", /* name */
416 FALSE, /* partial_inplace */
417 0xffff, /* src_mask */
418 0xffff, /* dst_mask */
419 FALSE), /* pcrel_offset */
420 /* A 6 bit absolute relocation of 6 bit offset.
421 For ldd/sdd command. */
422 HOWTO (R_AVR_6, /* type */
423 0, /* rightshift */
424 0, /* size (0 = byte, 1 = short, 2 = long) */
425 6, /* bitsize */
426 FALSE, /* pc_relative */
427 0, /* bitpos */
428 complain_overflow_dont,/* complain_on_overflow */
429 bfd_elf_generic_reloc, /* special_function */
430 "R_AVR_6", /* name */
431 FALSE, /* partial_inplace */
432 0xffff, /* src_mask */
433 0xffff, /* dst_mask */
434 FALSE), /* pcrel_offset */
435 /* A 6 bit absolute relocation of 6 bit offset.
436 For sbiw/adiw command. */
437 HOWTO (R_AVR_6_ADIW, /* type */
438 0, /* rightshift */
439 0, /* size (0 = byte, 1 = short, 2 = long) */
440 6, /* bitsize */
441 FALSE, /* pc_relative */
442 0, /* bitpos */
443 complain_overflow_dont,/* complain_on_overflow */
444 bfd_elf_generic_reloc, /* special_function */
445 "R_AVR_6_ADIW", /* name */
446 FALSE, /* partial_inplace */
447 0xffff, /* src_mask */
448 0xffff, /* dst_mask */
449 FALSE), /* pcrel_offset */
450 /* Most significant 8 bit value of a 32 bit link-time constant. */
451 HOWTO (R_AVR_MS8_LDI, /* type */
452 24, /* rightshift */
453 1, /* size (0 = byte, 1 = short, 2 = long) */
454 8, /* bitsize */
455 FALSE, /* pc_relative */
456 0, /* bitpos */
457 complain_overflow_dont, /* complain_on_overflow */
458 bfd_elf_generic_reloc, /* special_function */
459 "R_AVR_MS8_LDI", /* name */
460 FALSE, /* partial_inplace */
461 0xffff, /* src_mask */
462 0xffff, /* dst_mask */
463 FALSE), /* pcrel_offset */
464 /* Negative most significant 8 bit value of a 32 bit link-time constant. */
465 HOWTO (R_AVR_MS8_LDI_NEG, /* type */
466 24, /* rightshift */
467 1, /* size (0 = byte, 1 = short, 2 = long) */
468 8, /* bitsize */
469 FALSE, /* pc_relative */
470 0, /* bitpos */
471 complain_overflow_dont, /* complain_on_overflow */
472 bfd_elf_generic_reloc, /* special_function */
473 "R_AVR_MS8_LDI_NEG", /* name */
474 FALSE, /* partial_inplace */
475 0xffff, /* src_mask */
476 0xffff, /* dst_mask */
477 FALSE), /* pcrel_offset */
478 /* A low 8 bit absolute relocation of 24 bit program memory address.
479 For LDI command. Will be changed when linker stubs are needed. */
480 HOWTO (R_AVR_LO8_LDI_GS, /* type */
481 1, /* rightshift */
482 1, /* size (0 = byte, 1 = short, 2 = long) */
483 8, /* bitsize */
484 FALSE, /* pc_relative */
485 0, /* bitpos */
486 complain_overflow_dont, /* complain_on_overflow */
487 bfd_elf_generic_reloc, /* special_function */
488 "R_AVR_LO8_LDI_GS", /* name */
489 FALSE, /* partial_inplace */
490 0xffff, /* src_mask */
491 0xffff, /* dst_mask */
492 FALSE), /* pcrel_offset */
493 /* A low 8 bit absolute relocation of 24 bit program memory address.
494 For LDI command. Will be changed when linker stubs are needed. */
495 HOWTO (R_AVR_HI8_LDI_GS, /* type */
496 9, /* rightshift */
497 1, /* size (0 = byte, 1 = short, 2 = long) */
498 8, /* bitsize */
499 FALSE, /* pc_relative */
500 0, /* bitpos */
501 complain_overflow_dont, /* complain_on_overflow */
502 bfd_elf_generic_reloc, /* special_function */
503 "R_AVR_HI8_LDI_GS", /* name */
504 FALSE, /* partial_inplace */
505 0xffff, /* src_mask */
506 0xffff, /* dst_mask */
507 FALSE), /* pcrel_offset */
508 /* 8 bit offset. */
509 HOWTO (R_AVR_8, /* type */
510 0, /* rightshift */
511 0, /* size (0 = byte, 1 = short, 2 = long) */
512 8, /* bitsize */
513 FALSE, /* pc_relative */
514 0, /* bitpos */
515 complain_overflow_bitfield,/* complain_on_overflow */
516 bfd_elf_generic_reloc, /* special_function */
517 "R_AVR_8", /* name */
518 FALSE, /* partial_inplace */
519 0x000000ff, /* src_mask */
520 0x000000ff, /* dst_mask */
521 FALSE), /* pcrel_offset */
522 /* lo8-part to use in .byte lo8(sym). */
523 HOWTO (R_AVR_8_LO8, /* type */
524 0, /* rightshift */
525 0, /* size (0 = byte, 1 = short, 2 = long) */
526 8, /* bitsize */
527 FALSE, /* pc_relative */
528 0, /* bitpos */
529 complain_overflow_dont,/* complain_on_overflow */
530 bfd_elf_generic_reloc, /* special_function */
531 "R_AVR_8_LO8", /* name */
532 FALSE, /* partial_inplace */
533 0xffffff, /* src_mask */
534 0xffffff, /* dst_mask */
535 FALSE), /* pcrel_offset */
536 /* hi8-part to use in .byte hi8(sym). */
537 HOWTO (R_AVR_8_HI8, /* type */
538 8, /* rightshift */
539 0, /* size (0 = byte, 1 = short, 2 = long) */
540 8, /* bitsize */
541 FALSE, /* pc_relative */
542 0, /* bitpos */
543 complain_overflow_dont,/* complain_on_overflow */
544 bfd_elf_generic_reloc, /* special_function */
545 "R_AVR_8_HI8", /* name */
546 FALSE, /* partial_inplace */
547 0xffffff, /* src_mask */
548 0xffffff, /* dst_mask */
549 FALSE), /* pcrel_offset */
550 /* hlo8-part to use in .byte hlo8(sym). */
551 HOWTO (R_AVR_8_HLO8, /* type */
552 16, /* rightshift */
553 0, /* size (0 = byte, 1 = short, 2 = long) */
554 8, /* bitsize */
555 FALSE, /* pc_relative */
556 0, /* bitpos */
557 complain_overflow_dont,/* complain_on_overflow */
558 bfd_elf_generic_reloc, /* special_function */
559 "R_AVR_8_HLO8", /* name */
560 FALSE, /* partial_inplace */
561 0xffffff, /* src_mask */
562 0xffffff, /* dst_mask */
563 FALSE), /* pcrel_offset */
564 HOWTO (R_AVR_DIFF8, /* type */
565 0, /* rightshift */
566 0, /* size (0 = byte, 1 = short, 2 = long) */
567 8, /* bitsize */
568 FALSE, /* pc_relative */
569 0, /* bitpos */
570 complain_overflow_bitfield, /* complain_on_overflow */
571 bfd_elf_avr_diff_reloc, /* special_function */
572 "R_AVR_DIFF8", /* name */
573 FALSE, /* partial_inplace */
574 0, /* src_mask */
575 0xff, /* dst_mask */
576 FALSE), /* pcrel_offset */
577 HOWTO (R_AVR_DIFF16, /* type */
578 0, /* rightshift */
579 1, /* size (0 = byte, 1 = short, 2 = long) */
580 16, /* bitsize */
581 FALSE, /* pc_relative */
582 0, /* bitpos */
583 complain_overflow_bitfield, /* complain_on_overflow */
584 bfd_elf_avr_diff_reloc,/* special_function */
585 "R_AVR_DIFF16", /* name */
586 FALSE, /* partial_inplace */
587 0, /* src_mask */
588 0xffff, /* dst_mask */
589 FALSE), /* pcrel_offset */
590 HOWTO (R_AVR_DIFF32, /* type */
591 0, /* rightshift */
592 2, /* size (0 = byte, 1 = short, 2 = long) */
593 32, /* bitsize */
594 FALSE, /* pc_relative */
595 0, /* bitpos */
596 complain_overflow_bitfield, /* complain_on_overflow */
597 bfd_elf_avr_diff_reloc,/* special_function */
598 "R_AVR_DIFF32", /* name */
599 FALSE, /* partial_inplace */
600 0, /* src_mask */
601 0xffffffff, /* dst_mask */
602 FALSE), /* pcrel_offset */
603 /* 7 bit immediate for LDS/STS in Tiny core. */
604 HOWTO (R_AVR_LDS_STS_16, /* type */
605 0, /* rightshift */
606 1, /* size (0 = byte, 1 = short, 2 = long) */
607 7, /* bitsize */
608 FALSE, /* pc_relative */
609 0, /* bitpos */
610 complain_overflow_dont,/* complain_on_overflow */
611 bfd_elf_generic_reloc, /* special_function */
612 "R_AVR_LDS_STS_16", /* name */
613 FALSE, /* partial_inplace */
614 0xffff, /* src_mask */
615 0xffff, /* dst_mask */
616 FALSE), /* pcrel_offset */
617
618 HOWTO (R_AVR_PORT6, /* type */
619 0, /* rightshift */
620 0, /* size (0 = byte, 1 = short, 2 = long) */
621 6, /* bitsize */
622 FALSE, /* pc_relative */
623 0, /* bitpos */
624 complain_overflow_dont,/* complain_on_overflow */
625 bfd_elf_generic_reloc, /* special_function */
626 "R_AVR_PORT6", /* name */
627 FALSE, /* partial_inplace */
628 0xffffff, /* src_mask */
629 0xffffff, /* dst_mask */
630 FALSE), /* pcrel_offset */
631 HOWTO (R_AVR_PORT5, /* type */
632 0, /* rightshift */
633 0, /* size (0 = byte, 1 = short, 2 = long) */
634 5, /* bitsize */
635 FALSE, /* pc_relative */
636 0, /* bitpos */
637 complain_overflow_dont,/* complain_on_overflow */
638 bfd_elf_generic_reloc, /* special_function */
639 "R_AVR_PORT5", /* name */
640 FALSE, /* partial_inplace */
641 0xffffff, /* src_mask */
642 0xffffff, /* dst_mask */
643 FALSE), /* pcrel_offset */
644
645 /* A 32 bit PC relative relocation. */
646 HOWTO (R_AVR_32_PCREL, /* type */
647 0, /* rightshift */
648 2, /* size (0 = byte, 1 = short, 2 = long) */
649 32, /* bitsize */
650 TRUE, /* pc_relative */
651 0, /* bitpos */
652 complain_overflow_bitfield, /* complain_on_overflow */
653 bfd_elf_generic_reloc, /* special_function */
654 "R_AVR_32_PCREL", /* name */
655 FALSE, /* partial_inplace */
656 0xffffffff, /* src_mask */
657 0xffffffff, /* dst_mask */
658 TRUE), /* pcrel_offset */
659 };
660
661 /* Map BFD reloc types to AVR ELF reloc types. */
662
663 struct avr_reloc_map
664 {
665 bfd_reloc_code_real_type bfd_reloc_val;
666 unsigned int elf_reloc_val;
667 };
668
669 static const struct avr_reloc_map avr_reloc_map[] =
670 {
671 { BFD_RELOC_NONE, R_AVR_NONE },
672 { BFD_RELOC_32, R_AVR_32 },
673 { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL },
674 { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL },
675 { BFD_RELOC_16, R_AVR_16 },
676 { BFD_RELOC_AVR_16_PM, R_AVR_16_PM },
677 { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI},
678 { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI },
679 { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI },
680 { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI },
681 { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG },
682 { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG },
683 { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG },
684 { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG },
685 { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM },
686 { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS },
687 { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM },
688 { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS },
689 { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM },
690 { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG },
691 { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG },
692 { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG },
693 { BFD_RELOC_AVR_CALL, R_AVR_CALL },
694 { BFD_RELOC_AVR_LDI, R_AVR_LDI },
695 { BFD_RELOC_AVR_6, R_AVR_6 },
696 { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW },
697 { BFD_RELOC_8, R_AVR_8 },
698 { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 },
699 { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 },
700 { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 },
701 { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 },
702 { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 },
703 { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 },
704 { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16},
705 { BFD_RELOC_AVR_PORT6, R_AVR_PORT6},
706 { BFD_RELOC_AVR_PORT5, R_AVR_PORT5},
707 { BFD_RELOC_32_PCREL, R_AVR_32_PCREL}
708 };
709
710 static const struct bfd_elf_special_section elf_avr_special_sections[] =
711 {
712 { STRING_COMMA_LEN (".noinit"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
713 { NULL, 0, 0, 0, 0 }
714 };
715
716 /* Meant to be filled one day with the wrap around address for the
717 specific device. I.e. should get the value 0x4000 for 16k devices,
718 0x8000 for 32k devices and so on.
719
720 We initialize it here with a value of 0x1000000 resulting in
721 that we will never suggest a wrap-around jump during relaxation.
722 The logic of the source code later on assumes that in
723 avr_pc_wrap_around one single bit is set. */
724 static bfd_vma avr_pc_wrap_around = 0x10000000;
725
726 /* If this variable holds a value different from zero, the linker relaxation
727 machine will try to optimize call/ret sequences by a single jump
728 instruction. This option could be switched off by a linker switch. */
729 static int avr_replace_call_ret_sequences = 1;
730 \f
731
732 /* Per-section relaxation related information for avr. */
733
734 struct avr_relax_info
735 {
736 /* Track the avr property records that apply to this section. */
737
738 struct
739 {
740 /* Number of records in the list. */
741 unsigned count;
742
743 /* How many records worth of space have we allocated. */
744 unsigned allocated;
745
746 /* The records, only COUNT records are initialised. */
747 struct avr_property_record *items;
748 } records;
749 };
750
751 /* Per section data, specialised for avr. */
752
753 struct elf_avr_section_data
754 {
755 /* The standard data must appear first. */
756 struct bfd_elf_section_data elf;
757
758 /* Relaxation related information. */
759 struct avr_relax_info relax_info;
760 };
761
762 /* Possibly initialise avr specific data for new section SEC from ABFD. */
763
764 static bfd_boolean
765 elf_avr_new_section_hook (bfd *abfd, asection *sec)
766 {
767 if (!sec->used_by_bfd)
768 {
769 struct elf_avr_section_data *sdata;
770 size_t amt = sizeof (*sdata);
771
772 sdata = bfd_zalloc (abfd, amt);
773 if (sdata == NULL)
774 return FALSE;
775 sec->used_by_bfd = sdata;
776 }
777
778 return _bfd_elf_new_section_hook (abfd, sec);
779 }
780
781 /* Return a pointer to the relaxation information for SEC. */
782
783 static struct avr_relax_info *
784 get_avr_relax_info (asection *sec)
785 {
786 struct elf_avr_section_data *section_data;
787
788 /* No info available if no section or if it is an output section. */
789 if (!sec || sec == sec->output_section)
790 return NULL;
791
792 section_data = (struct elf_avr_section_data *) elf_section_data (sec);
793 return &section_data->relax_info;
794 }
795
796 /* Initialise the per section relaxation information for SEC. */
797
798 static void
799 init_avr_relax_info (asection *sec)
800 {
801 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
802
803 relax_info->records.count = 0;
804 relax_info->records.allocated = 0;
805 relax_info->records.items = NULL;
806 }
807
808 /* Initialize an entry in the stub hash table. */
809
810 static struct bfd_hash_entry *
811 stub_hash_newfunc (struct bfd_hash_entry *entry,
812 struct bfd_hash_table *table,
813 const char *string)
814 {
815 /* Allocate the structure if it has not already been allocated by a
816 subclass. */
817 if (entry == NULL)
818 {
819 entry = bfd_hash_allocate (table,
820 sizeof (struct elf32_avr_stub_hash_entry));
821 if (entry == NULL)
822 return entry;
823 }
824
825 /* Call the allocation method of the superclass. */
826 entry = bfd_hash_newfunc (entry, table, string);
827 if (entry != NULL)
828 {
829 struct elf32_avr_stub_hash_entry *hsh;
830
831 /* Initialize the local fields. */
832 hsh = avr_stub_hash_entry (entry);
833 hsh->stub_offset = 0;
834 hsh->target_value = 0;
835 }
836
837 return entry;
838 }
839
840 /* This function is just a straight passthrough to the real
841 function in linker.c. Its prupose is so that its address
842 can be compared inside the avr_link_hash_table macro. */
843
844 static struct bfd_hash_entry *
845 elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry,
846 struct bfd_hash_table * table,
847 const char * string)
848 {
849 return _bfd_elf_link_hash_newfunc (entry, table, string);
850 }
851
852 /* Free the derived linker hash table. */
853
854 static void
855 elf32_avr_link_hash_table_free (bfd *obfd)
856 {
857 struct elf32_avr_link_hash_table *htab
858 = (struct elf32_avr_link_hash_table *) obfd->link.hash;
859
860 /* Free the address mapping table. */
861 free (htab->amt_stub_offsets);
862 free (htab->amt_destination_addr);
863
864 bfd_hash_table_free (&htab->bstab);
865 _bfd_elf_link_hash_table_free (obfd);
866 }
867
868 /* Create the derived linker hash table. The AVR ELF port uses the derived
869 hash table to keep information specific to the AVR ELF linker (without
870 using static variables). */
871
872 static struct bfd_link_hash_table *
873 elf32_avr_link_hash_table_create (bfd *abfd)
874 {
875 struct elf32_avr_link_hash_table *htab;
876 size_t amt = sizeof (*htab);
877
878 htab = bfd_zmalloc (amt);
879 if (htab == NULL)
880 return NULL;
881
882 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
883 elf32_avr_link_hash_newfunc,
884 sizeof (struct elf_link_hash_entry),
885 AVR_ELF_DATA))
886 {
887 free (htab);
888 return NULL;
889 }
890
891 /* Init the stub hash table too. */
892 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
893 sizeof (struct elf32_avr_stub_hash_entry)))
894 {
895 _bfd_elf_link_hash_table_free (abfd);
896 return NULL;
897 }
898 htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free;
899
900 return &htab->etab.root;
901 }
902
903 /* Calculates the effective distance of a pc relative jump/call. */
904
905 static int
906 avr_relative_distance_considering_wrap_around (unsigned int distance)
907 {
908 unsigned int wrap_around_mask = avr_pc_wrap_around - 1;
909 int dist_with_wrap_around = distance & wrap_around_mask;
910
911 if (dist_with_wrap_around >= ((int) (avr_pc_wrap_around >> 1)))
912 dist_with_wrap_around -= avr_pc_wrap_around;
913
914 return dist_with_wrap_around;
915 }
916
917
918 static reloc_howto_type *
919 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
920 bfd_reloc_code_real_type code)
921 {
922 unsigned int i;
923
924 for (i = 0;
925 i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
926 i++)
927 if (avr_reloc_map[i].bfd_reloc_val == code)
928 return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
929
930 return NULL;
931 }
932
933 static reloc_howto_type *
934 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
935 const char *r_name)
936 {
937 unsigned int i;
938
939 for (i = 0;
940 i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]);
941 i++)
942 if (elf_avr_howto_table[i].name != NULL
943 && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0)
944 return &elf_avr_howto_table[i];
945
946 return NULL;
947 }
948
949 /* Set the howto pointer for an AVR ELF reloc. */
950
951 static bfd_boolean
952 avr_info_to_howto_rela (bfd *abfd,
953 arelent *cache_ptr,
954 Elf_Internal_Rela *dst)
955 {
956 unsigned int r_type;
957
958 r_type = ELF32_R_TYPE (dst->r_info);
959 if (r_type >= (unsigned int) R_AVR_max)
960 {
961 /* xgettext:c-format */
962 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
963 abfd, r_type);
964 bfd_set_error (bfd_error_bad_value);
965 return FALSE;
966 }
967 cache_ptr->howto = &elf_avr_howto_table[r_type];
968 return TRUE;
969 }
970
971 static bfd_boolean
972 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
973 {
974 return (relocation >= 0x020000);
975 }
976
977 /* Returns the address of the corresponding stub if there is one.
978 Returns otherwise an address above 0x020000. This function
979 could also be used, if there is no knowledge on the section where
980 the destination is found. */
981
982 static bfd_vma
983 avr_get_stub_addr (bfd_vma srel,
984 struct elf32_avr_link_hash_table *htab)
985 {
986 unsigned int sindex;
987 bfd_vma stub_sec_addr =
988 (htab->stub_sec->output_section->vma +
989 htab->stub_sec->output_offset);
990
991 for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
992 if (htab->amt_destination_addr[sindex] == srel)
993 return htab->amt_stub_offsets[sindex] + stub_sec_addr;
994
995 /* Return an address that could not be reached by 16 bit relocs. */
996 return 0x020000;
997 }
998
999 /* Perform a diff relocation. Nothing to do, as the difference value is already
1000 written into the section's contents. */
1001
1002 static bfd_reloc_status_type
1003 bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
1004 arelent *reloc_entry ATTRIBUTE_UNUSED,
1005 asymbol *symbol ATTRIBUTE_UNUSED,
1006 void *data ATTRIBUTE_UNUSED,
1007 asection *input_section ATTRIBUTE_UNUSED,
1008 bfd *output_bfd ATTRIBUTE_UNUSED,
1009 char **error_message ATTRIBUTE_UNUSED)
1010 {
1011 return bfd_reloc_ok;
1012 }
1013
1014
1015 /* Perform a single relocation. By default we use the standard BFD
1016 routines, but a few relocs, we have to do them ourselves. */
1017
1018 static bfd_reloc_status_type
1019 avr_final_link_relocate (reloc_howto_type * howto,
1020 bfd * input_bfd,
1021 asection * input_section,
1022 bfd_byte * contents,
1023 Elf_Internal_Rela * rel,
1024 bfd_vma relocation,
1025 struct elf32_avr_link_hash_table * htab)
1026 {
1027 bfd_reloc_status_type r = bfd_reloc_ok;
1028 bfd_vma x;
1029 bfd_signed_vma srel;
1030 bfd_signed_vma reloc_addr;
1031 bfd_boolean use_stubs = FALSE;
1032 /* Usually is 0, unless we are generating code for a bootloader. */
1033 bfd_signed_vma base_addr = htab->vector_base;
1034
1035 /* Absolute addr of the reloc in the final excecutable. */
1036 reloc_addr = rel->r_offset + input_section->output_section->vma
1037 + input_section->output_offset;
1038
1039 switch (howto->type)
1040 {
1041 case R_AVR_7_PCREL:
1042 contents += rel->r_offset;
1043 srel = (bfd_signed_vma) relocation;
1044 srel += rel->r_addend;
1045 srel -= rel->r_offset;
1046 srel -= 2; /* Branch instructions add 2 to the PC... */
1047 srel -= (input_section->output_section->vma +
1048 input_section->output_offset);
1049
1050 if (srel & 1)
1051 return bfd_reloc_outofrange;
1052 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
1053 return bfd_reloc_overflow;
1054 x = bfd_get_16 (input_bfd, contents);
1055 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
1056 bfd_put_16 (input_bfd, x, contents);
1057 break;
1058
1059 case R_AVR_13_PCREL:
1060 contents += rel->r_offset;
1061 srel = (bfd_signed_vma) relocation;
1062 srel += rel->r_addend;
1063 srel -= rel->r_offset;
1064 srel -= 2; /* Branch instructions add 2 to the PC... */
1065 srel -= (input_section->output_section->vma +
1066 input_section->output_offset);
1067
1068 if (srel & 1)
1069 return bfd_reloc_outofrange;
1070
1071 srel = avr_relative_distance_considering_wrap_around (srel);
1072
1073 /* AVR addresses commands as words. */
1074 srel >>= 1;
1075
1076 /* Check for overflow. */
1077 if (srel < -2048 || srel > 2047)
1078 {
1079 /* Relative distance is too large. */
1080
1081 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
1082 switch (bfd_get_mach (input_bfd))
1083 {
1084 case bfd_mach_avr2:
1085 case bfd_mach_avr25:
1086 case bfd_mach_avr4:
1087 break;
1088
1089 default:
1090 return bfd_reloc_overflow;
1091 }
1092 }
1093
1094 x = bfd_get_16 (input_bfd, contents);
1095 x = (x & 0xf000) | (srel & 0xfff);
1096 bfd_put_16 (input_bfd, x, contents);
1097 break;
1098
1099 case R_AVR_LO8_LDI:
1100 contents += rel->r_offset;
1101 srel = (bfd_signed_vma) relocation + rel->r_addend;
1102 x = bfd_get_16 (input_bfd, contents);
1103 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1104 bfd_put_16 (input_bfd, x, contents);
1105 break;
1106
1107 case R_AVR_LDI:
1108 contents += rel->r_offset;
1109 srel = (bfd_signed_vma) relocation + rel->r_addend;
1110 if (((srel > 0) && (srel & 0xffff) > 255)
1111 || ((srel < 0) && ((-srel) & 0xffff) > 128))
1112 /* Remove offset for data/eeprom section. */
1113 return bfd_reloc_overflow;
1114
1115 x = bfd_get_16 (input_bfd, contents);
1116 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1117 bfd_put_16 (input_bfd, x, contents);
1118 break;
1119
1120 case R_AVR_6:
1121 contents += rel->r_offset;
1122 srel = (bfd_signed_vma) relocation + rel->r_addend;
1123 if (((srel & 0xffff) > 63) || (srel < 0))
1124 /* Remove offset for data/eeprom section. */
1125 return bfd_reloc_overflow;
1126 x = bfd_get_16 (input_bfd, contents);
1127 x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
1128 | ((srel & (1 << 5)) << 8));
1129 bfd_put_16 (input_bfd, x, contents);
1130 break;
1131
1132 case R_AVR_6_ADIW:
1133 contents += rel->r_offset;
1134 srel = (bfd_signed_vma) relocation + rel->r_addend;
1135 if (((srel & 0xffff) > 63) || (srel < 0))
1136 /* Remove offset for data/eeprom section. */
1137 return bfd_reloc_overflow;
1138 x = bfd_get_16 (input_bfd, contents);
1139 x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
1140 bfd_put_16 (input_bfd, x, contents);
1141 break;
1142
1143 case R_AVR_HI8_LDI:
1144 contents += rel->r_offset;
1145 srel = (bfd_signed_vma) relocation + rel->r_addend;
1146 srel = (srel >> 8) & 0xff;
1147 x = bfd_get_16 (input_bfd, contents);
1148 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1149 bfd_put_16 (input_bfd, x, contents);
1150 break;
1151
1152 case R_AVR_HH8_LDI:
1153 contents += rel->r_offset;
1154 srel = (bfd_signed_vma) relocation + rel->r_addend;
1155 srel = (srel >> 16) & 0xff;
1156 x = bfd_get_16 (input_bfd, contents);
1157 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1158 bfd_put_16 (input_bfd, x, contents);
1159 break;
1160
1161 case R_AVR_MS8_LDI:
1162 contents += rel->r_offset;
1163 srel = (bfd_signed_vma) relocation + rel->r_addend;
1164 srel = (srel >> 24) & 0xff;
1165 x = bfd_get_16 (input_bfd, contents);
1166 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1167 bfd_put_16 (input_bfd, x, contents);
1168 break;
1169
1170 case R_AVR_LO8_LDI_NEG:
1171 contents += rel->r_offset;
1172 srel = (bfd_signed_vma) relocation + rel->r_addend;
1173 srel = -srel;
1174 x = bfd_get_16 (input_bfd, contents);
1175 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1176 bfd_put_16 (input_bfd, x, contents);
1177 break;
1178
1179 case R_AVR_HI8_LDI_NEG:
1180 contents += rel->r_offset;
1181 srel = (bfd_signed_vma) relocation + rel->r_addend;
1182 srel = -srel;
1183 srel = (srel >> 8) & 0xff;
1184 x = bfd_get_16 (input_bfd, contents);
1185 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1186 bfd_put_16 (input_bfd, x, contents);
1187 break;
1188
1189 case R_AVR_HH8_LDI_NEG:
1190 contents += rel->r_offset;
1191 srel = (bfd_signed_vma) relocation + rel->r_addend;
1192 srel = -srel;
1193 srel = (srel >> 16) & 0xff;
1194 x = bfd_get_16 (input_bfd, contents);
1195 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1196 bfd_put_16 (input_bfd, x, contents);
1197 break;
1198
1199 case R_AVR_MS8_LDI_NEG:
1200 contents += rel->r_offset;
1201 srel = (bfd_signed_vma) relocation + rel->r_addend;
1202 srel = -srel;
1203 srel = (srel >> 24) & 0xff;
1204 x = bfd_get_16 (input_bfd, contents);
1205 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1206 bfd_put_16 (input_bfd, x, contents);
1207 break;
1208
1209 case R_AVR_LO8_LDI_GS:
1210 use_stubs = (!htab->no_stubs);
1211 /* Fall through. */
1212 case R_AVR_LO8_LDI_PM:
1213 contents += rel->r_offset;
1214 srel = (bfd_signed_vma) relocation + rel->r_addend;
1215
1216 if (use_stubs
1217 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1218 {
1219 bfd_vma old_srel = srel;
1220
1221 /* We need to use the address of the stub instead. */
1222 srel = avr_get_stub_addr (srel, htab);
1223 if (debug_stubs)
1224 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1225 "reloc at address 0x%x.\n",
1226 (unsigned int) srel,
1227 (unsigned int) old_srel,
1228 (unsigned int) reloc_addr);
1229
1230 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1231 return bfd_reloc_outofrange;
1232 }
1233
1234 if (srel & 1)
1235 return bfd_reloc_outofrange;
1236 srel = srel >> 1;
1237 x = bfd_get_16 (input_bfd, contents);
1238 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1239 bfd_put_16 (input_bfd, x, contents);
1240 break;
1241
1242 case R_AVR_HI8_LDI_GS:
1243 use_stubs = (!htab->no_stubs);
1244 /* Fall through. */
1245 case R_AVR_HI8_LDI_PM:
1246 contents += rel->r_offset;
1247 srel = (bfd_signed_vma) relocation + rel->r_addend;
1248
1249 if (use_stubs
1250 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1251 {
1252 bfd_vma old_srel = srel;
1253
1254 /* We need to use the address of the stub instead. */
1255 srel = avr_get_stub_addr (srel, htab);
1256 if (debug_stubs)
1257 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1258 "reloc at address 0x%x.\n",
1259 (unsigned int) srel,
1260 (unsigned int) old_srel,
1261 (unsigned int) reloc_addr);
1262
1263 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1264 return bfd_reloc_outofrange;
1265 }
1266
1267 if (srel & 1)
1268 return bfd_reloc_outofrange;
1269 srel = srel >> 1;
1270 srel = (srel >> 8) & 0xff;
1271 x = bfd_get_16 (input_bfd, contents);
1272 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1273 bfd_put_16 (input_bfd, x, contents);
1274 break;
1275
1276 case R_AVR_HH8_LDI_PM:
1277 contents += rel->r_offset;
1278 srel = (bfd_signed_vma) relocation + rel->r_addend;
1279 if (srel & 1)
1280 return bfd_reloc_outofrange;
1281 srel = srel >> 1;
1282 srel = (srel >> 16) & 0xff;
1283 x = bfd_get_16 (input_bfd, contents);
1284 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1285 bfd_put_16 (input_bfd, x, contents);
1286 break;
1287
1288 case R_AVR_LO8_LDI_PM_NEG:
1289 contents += rel->r_offset;
1290 srel = (bfd_signed_vma) relocation + rel->r_addend;
1291 srel = -srel;
1292 if (srel & 1)
1293 return bfd_reloc_outofrange;
1294 srel = srel >> 1;
1295 x = bfd_get_16 (input_bfd, contents);
1296 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1297 bfd_put_16 (input_bfd, x, contents);
1298 break;
1299
1300 case R_AVR_HI8_LDI_PM_NEG:
1301 contents += rel->r_offset;
1302 srel = (bfd_signed_vma) relocation + rel->r_addend;
1303 srel = -srel;
1304 if (srel & 1)
1305 return bfd_reloc_outofrange;
1306 srel = srel >> 1;
1307 srel = (srel >> 8) & 0xff;
1308 x = bfd_get_16 (input_bfd, contents);
1309 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1310 bfd_put_16 (input_bfd, x, contents);
1311 break;
1312
1313 case R_AVR_HH8_LDI_PM_NEG:
1314 contents += rel->r_offset;
1315 srel = (bfd_signed_vma) relocation + rel->r_addend;
1316 srel = -srel;
1317 if (srel & 1)
1318 return bfd_reloc_outofrange;
1319 srel = srel >> 1;
1320 srel = (srel >> 16) & 0xff;
1321 x = bfd_get_16 (input_bfd, contents);
1322 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
1323 bfd_put_16 (input_bfd, x, contents);
1324 break;
1325
1326 case R_AVR_CALL:
1327 contents += rel->r_offset;
1328 srel = (bfd_signed_vma) relocation + rel->r_addend;
1329 if (srel & 1)
1330 return bfd_reloc_outofrange;
1331 srel = srel >> 1;
1332 x = bfd_get_16 (input_bfd, contents);
1333 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
1334 bfd_put_16 (input_bfd, x, contents);
1335 bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
1336 break;
1337
1338 case R_AVR_16_PM:
1339 use_stubs = (!htab->no_stubs);
1340 contents += rel->r_offset;
1341 srel = (bfd_signed_vma) relocation + rel->r_addend;
1342
1343 if (use_stubs
1344 && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1345 {
1346 bfd_vma old_srel = srel;
1347
1348 /* We need to use the address of the stub instead. */
1349 srel = avr_get_stub_addr (srel,htab);
1350 if (debug_stubs)
1351 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1352 "reloc at address 0x%x.\n",
1353 (unsigned int) srel,
1354 (unsigned int) old_srel,
1355 (unsigned int) reloc_addr);
1356
1357 if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
1358 return bfd_reloc_outofrange;
1359 }
1360
1361 if (srel & 1)
1362 return bfd_reloc_outofrange;
1363 srel = srel >> 1;
1364 bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
1365 break;
1366
1367 case R_AVR_DIFF8:
1368 case R_AVR_DIFF16:
1369 case R_AVR_DIFF32:
1370 /* Nothing to do here, as contents already contains the diff value. */
1371 r = bfd_reloc_ok;
1372 break;
1373
1374 case R_AVR_LDS_STS_16:
1375 contents += rel->r_offset;
1376 srel = (bfd_signed_vma) relocation + rel->r_addend;
1377 if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
1378 return bfd_reloc_outofrange;
1379 srel = srel & 0x7f;
1380 x = bfd_get_16 (input_bfd, contents);
1381 x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
1382 bfd_put_16 (input_bfd, x, contents);
1383 break;
1384
1385 case R_AVR_PORT6:
1386 contents += rel->r_offset;
1387 srel = (bfd_signed_vma) relocation + rel->r_addend;
1388 if ((srel & 0xffff) > 0x3f)
1389 return bfd_reloc_outofrange;
1390 x = bfd_get_16 (input_bfd, contents);
1391 x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
1392 bfd_put_16 (input_bfd, x, contents);
1393 break;
1394
1395 case R_AVR_PORT5:
1396 contents += rel->r_offset;
1397 srel = (bfd_signed_vma) relocation + rel->r_addend;
1398 if ((srel & 0xffff) > 0x1f)
1399 return bfd_reloc_outofrange;
1400 x = bfd_get_16 (input_bfd, contents);
1401 x = (x & 0xff07) | ((srel & 0x1f) << 3);
1402 bfd_put_16 (input_bfd, x, contents);
1403 break;
1404
1405 default:
1406 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1407 contents, rel->r_offset,
1408 relocation, rel->r_addend);
1409 }
1410
1411 return r;
1412 }
1413
1414 /* Relocate an AVR ELF section. */
1415
1416 static bfd_boolean
1417 elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1418 struct bfd_link_info *info,
1419 bfd *input_bfd,
1420 asection *input_section,
1421 bfd_byte *contents,
1422 Elf_Internal_Rela *relocs,
1423 Elf_Internal_Sym *local_syms,
1424 asection **local_sections)
1425 {
1426 Elf_Internal_Shdr * symtab_hdr;
1427 struct elf_link_hash_entry ** sym_hashes;
1428 Elf_Internal_Rela * rel;
1429 Elf_Internal_Rela * relend;
1430 struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
1431
1432 if (htab == NULL)
1433 return FALSE;
1434
1435 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1436 sym_hashes = elf_sym_hashes (input_bfd);
1437 relend = relocs + input_section->reloc_count;
1438
1439 for (rel = relocs; rel < relend; rel ++)
1440 {
1441 reloc_howto_type * howto;
1442 unsigned long r_symndx;
1443 Elf_Internal_Sym * sym;
1444 asection * sec;
1445 struct elf_link_hash_entry * h;
1446 bfd_vma relocation;
1447 bfd_reloc_status_type r;
1448 const char * name;
1449 int r_type;
1450
1451 r_type = ELF32_R_TYPE (rel->r_info);
1452 r_symndx = ELF32_R_SYM (rel->r_info);
1453 howto = elf_avr_howto_table + r_type;
1454 h = NULL;
1455 sym = NULL;
1456 sec = NULL;
1457
1458 if (r_symndx < symtab_hdr->sh_info)
1459 {
1460 sym = local_syms + r_symndx;
1461 sec = local_sections [r_symndx];
1462 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1463
1464 name = bfd_elf_string_from_elf_section
1465 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1466 name = name == NULL ? bfd_section_name (sec) : name;
1467 }
1468 else
1469 {
1470 bfd_boolean unresolved_reloc, warned, ignored;
1471
1472 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1473 r_symndx, symtab_hdr, sym_hashes,
1474 h, sec, relocation,
1475 unresolved_reloc, warned, ignored);
1476
1477 name = h->root.root.string;
1478 }
1479
1480 if (sec != NULL && discarded_section (sec))
1481 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1482 rel, 1, relend, howto, 0, contents);
1483
1484 if (bfd_link_relocatable (info))
1485 continue;
1486
1487 r = avr_final_link_relocate (howto, input_bfd, input_section,
1488 contents, rel, relocation, htab);
1489
1490 if (r != bfd_reloc_ok)
1491 {
1492 const char * msg = (const char *) NULL;
1493
1494 switch (r)
1495 {
1496 case bfd_reloc_overflow:
1497 (*info->callbacks->reloc_overflow)
1498 (info, (h ? &h->root : NULL), name, howto->name,
1499 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1500 break;
1501
1502 case bfd_reloc_undefined:
1503 (*info->callbacks->undefined_symbol)
1504 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1505 break;
1506
1507 case bfd_reloc_outofrange:
1508 msg = _("internal error: out of range error");
1509 break;
1510
1511 case bfd_reloc_notsupported:
1512 msg = _("internal error: unsupported relocation error");
1513 break;
1514
1515 case bfd_reloc_dangerous:
1516 msg = _("internal error: dangerous relocation");
1517 break;
1518
1519 default:
1520 msg = _("internal error: unknown error");
1521 break;
1522 }
1523
1524 if (msg)
1525 (*info->callbacks->warning) (info, msg, name, input_bfd,
1526 input_section, rel->r_offset);
1527 }
1528 }
1529
1530 return TRUE;
1531 }
1532
1533 /* The final processing done just before writing out a AVR ELF object
1534 file. This gets the AVR architecture right based on the machine
1535 number. */
1536
1537 static bfd_boolean
1538 bfd_elf_avr_final_write_processing (bfd *abfd)
1539 {
1540 unsigned long val;
1541
1542 switch (bfd_get_mach (abfd))
1543 {
1544 default:
1545 case bfd_mach_avr2:
1546 val = E_AVR_MACH_AVR2;
1547 break;
1548
1549 case bfd_mach_avr1:
1550 val = E_AVR_MACH_AVR1;
1551 break;
1552
1553 case bfd_mach_avr25:
1554 val = E_AVR_MACH_AVR25;
1555 break;
1556
1557 case bfd_mach_avr3:
1558 val = E_AVR_MACH_AVR3;
1559 break;
1560
1561 case bfd_mach_avr31:
1562 val = E_AVR_MACH_AVR31;
1563 break;
1564
1565 case bfd_mach_avr35:
1566 val = E_AVR_MACH_AVR35;
1567 break;
1568
1569 case bfd_mach_avr4:
1570 val = E_AVR_MACH_AVR4;
1571 break;
1572
1573 case bfd_mach_avr5:
1574 val = E_AVR_MACH_AVR5;
1575 break;
1576
1577 case bfd_mach_avr51:
1578 val = E_AVR_MACH_AVR51;
1579 break;
1580
1581 case bfd_mach_avr6:
1582 val = E_AVR_MACH_AVR6;
1583 break;
1584
1585 case bfd_mach_avrxmega1:
1586 val = E_AVR_MACH_XMEGA1;
1587 break;
1588
1589 case bfd_mach_avrxmega2:
1590 val = E_AVR_MACH_XMEGA2;
1591 break;
1592
1593 case bfd_mach_avrxmega3:
1594 val = E_AVR_MACH_XMEGA3;
1595 break;
1596
1597 case bfd_mach_avrxmega4:
1598 val = E_AVR_MACH_XMEGA4;
1599 break;
1600
1601 case bfd_mach_avrxmega5:
1602 val = E_AVR_MACH_XMEGA5;
1603 break;
1604
1605 case bfd_mach_avrxmega6:
1606 val = E_AVR_MACH_XMEGA6;
1607 break;
1608
1609 case bfd_mach_avrxmega7:
1610 val = E_AVR_MACH_XMEGA7;
1611 break;
1612
1613 case bfd_mach_avrtiny:
1614 val = E_AVR_MACH_AVRTINY;
1615 break;
1616 }
1617
1618 elf_elfheader (abfd)->e_machine = EM_AVR;
1619 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
1620 elf_elfheader (abfd)->e_flags |= val;
1621 return _bfd_elf_final_write_processing (abfd);
1622 }
1623
1624 /* Set the right machine number. */
1625
1626 static bfd_boolean
1627 elf32_avr_object_p (bfd *abfd)
1628 {
1629 unsigned int e_set = bfd_mach_avr2;
1630
1631 if (elf_elfheader (abfd)->e_machine == EM_AVR
1632 || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
1633 {
1634 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
1635
1636 switch (e_mach)
1637 {
1638 default:
1639 case E_AVR_MACH_AVR2:
1640 e_set = bfd_mach_avr2;
1641 break;
1642
1643 case E_AVR_MACH_AVR1:
1644 e_set = bfd_mach_avr1;
1645 break;
1646
1647 case E_AVR_MACH_AVR25:
1648 e_set = bfd_mach_avr25;
1649 break;
1650
1651 case E_AVR_MACH_AVR3:
1652 e_set = bfd_mach_avr3;
1653 break;
1654
1655 case E_AVR_MACH_AVR31:
1656 e_set = bfd_mach_avr31;
1657 break;
1658
1659 case E_AVR_MACH_AVR35:
1660 e_set = bfd_mach_avr35;
1661 break;
1662
1663 case E_AVR_MACH_AVR4:
1664 e_set = bfd_mach_avr4;
1665 break;
1666
1667 case E_AVR_MACH_AVR5:
1668 e_set = bfd_mach_avr5;
1669 break;
1670
1671 case E_AVR_MACH_AVR51:
1672 e_set = bfd_mach_avr51;
1673 break;
1674
1675 case E_AVR_MACH_AVR6:
1676 e_set = bfd_mach_avr6;
1677 break;
1678
1679 case E_AVR_MACH_XMEGA1:
1680 e_set = bfd_mach_avrxmega1;
1681 break;
1682
1683 case E_AVR_MACH_XMEGA2:
1684 e_set = bfd_mach_avrxmega2;
1685 break;
1686
1687 case E_AVR_MACH_XMEGA3:
1688 e_set = bfd_mach_avrxmega3;
1689 break;
1690
1691 case E_AVR_MACH_XMEGA4:
1692 e_set = bfd_mach_avrxmega4;
1693 break;
1694
1695 case E_AVR_MACH_XMEGA5:
1696 e_set = bfd_mach_avrxmega5;
1697 break;
1698
1699 case E_AVR_MACH_XMEGA6:
1700 e_set = bfd_mach_avrxmega6;
1701 break;
1702
1703 case E_AVR_MACH_XMEGA7:
1704 e_set = bfd_mach_avrxmega7;
1705 break;
1706
1707 case E_AVR_MACH_AVRTINY:
1708 e_set = bfd_mach_avrtiny;
1709 break;
1710 }
1711 }
1712 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
1713 e_set);
1714 }
1715
1716 /* Returns whether the relocation type passed is a diff reloc. */
1717
1718 static bfd_boolean
1719 elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
1720 {
1721 return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
1722 ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
1723 || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
1724 }
1725
1726 /* Reduce the diff value written in the section by count if the shrinked
1727 insn address happens to fall between the two symbols for which this
1728 diff reloc was emitted. */
1729
1730 static void
1731 elf32_avr_adjust_diff_reloc_value (bfd *abfd,
1732 struct bfd_section *isec,
1733 Elf_Internal_Rela *irel,
1734 bfd_vma symval,
1735 bfd_vma shrinked_insn_address,
1736 int count)
1737 {
1738 unsigned char *reloc_contents = NULL;
1739 unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
1740 if (isec_contents == NULL)
1741 {
1742 if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
1743 return;
1744
1745 elf_section_data (isec)->this_hdr.contents = isec_contents;
1746 }
1747
1748 reloc_contents = isec_contents + irel->r_offset;
1749
1750 /* Read value written in object file. */
1751 bfd_signed_vma x = 0;
1752 switch (ELF32_R_TYPE (irel->r_info))
1753 {
1754 case R_AVR_DIFF8:
1755 {
1756 x = bfd_get_signed_8 (abfd, reloc_contents);
1757 break;
1758 }
1759 case R_AVR_DIFF16:
1760 {
1761 x = bfd_get_signed_16 (abfd, reloc_contents);
1762 break;
1763 }
1764 case R_AVR_DIFF32:
1765 {
1766 x = bfd_get_signed_32 (abfd, reloc_contents);
1767 break;
1768 }
1769 default:
1770 {
1771 BFD_FAIL();
1772 }
1773 }
1774
1775 /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
1776 into the object file at the reloc offset. sym2's logical value is
1777 symval (<start_of_section>) + reloc addend. Compute the start and end
1778 addresses and check if the shrinked insn falls between sym1 and sym2. */
1779
1780 bfd_vma sym2_address = symval + irel->r_addend;
1781 bfd_vma sym1_address = sym2_address - x;
1782
1783 /* Don't assume sym2 is bigger than sym1 - the difference
1784 could be negative. Compute start and end addresses, and
1785 use those to see if they span shrinked_insn_address. */
1786
1787 bfd_vma start_address = sym1_address < sym2_address
1788 ? sym1_address : sym2_address;
1789 bfd_vma end_address = sym1_address > sym2_address
1790 ? sym1_address : sym2_address;
1791
1792
1793 if (shrinked_insn_address >= start_address
1794 && shrinked_insn_address < end_address)
1795 {
1796 /* Reduce the diff value by count bytes and write it back into section
1797 contents. */
1798 bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
1799
1800 if (sym2_address > shrinked_insn_address)
1801 irel->r_addend -= count;
1802
1803 switch (ELF32_R_TYPE (irel->r_info))
1804 {
1805 case R_AVR_DIFF8:
1806 {
1807 bfd_put_signed_8 (abfd, new_diff, reloc_contents);
1808 break;
1809 }
1810 case R_AVR_DIFF16:
1811 {
1812 bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents);
1813 break;
1814 }
1815 case R_AVR_DIFF32:
1816 {
1817 bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
1818 break;
1819 }
1820 default:
1821 {
1822 BFD_FAIL();
1823 }
1824 }
1825
1826 }
1827 }
1828
1829 static void
1830 elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd,
1831 asection *isec,
1832 Elf_Internal_Rela *irel, bfd_vma symval,
1833 bfd_vma shrinked_insn_address,
1834 bfd_vma shrink_boundary,
1835 int count)
1836 {
1837
1838 if (elf32_avr_is_diff_reloc (irel))
1839 {
1840 elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
1841 symval,
1842 shrinked_insn_address,
1843 count);
1844 }
1845 else
1846 {
1847 bfd_vma reloc_value = symval + irel->r_addend;
1848 bfd_boolean addend_within_shrink_boundary =
1849 (reloc_value <= shrink_boundary);
1850
1851 bfd_boolean reloc_spans_insn =
1852 (symval <= shrinked_insn_address
1853 && reloc_value > shrinked_insn_address
1854 && addend_within_shrink_boundary);
1855
1856 if (! reloc_spans_insn)
1857 return;
1858
1859 irel->r_addend -= count;
1860
1861 if (debug_relax)
1862 printf ("Relocation's addend needed to be fixed \n");
1863 }
1864 }
1865
1866 static bfd_boolean
1867 avr_should_move_sym (symvalue symval,
1868 bfd_vma start,
1869 bfd_vma end,
1870 bfd_boolean did_pad)
1871 {
1872 bfd_boolean sym_within_boundary =
1873 did_pad ? symval < end : symval <= end;
1874 return (symval > start && sym_within_boundary);
1875 }
1876
1877 static bfd_boolean
1878 avr_should_reduce_sym_size (symvalue symval,
1879 symvalue symend,
1880 bfd_vma start,
1881 bfd_vma end,
1882 bfd_boolean did_pad)
1883 {
1884 bfd_boolean sym_end_within_boundary =
1885 did_pad ? symend < end : symend <= end;
1886 return (symval <= start && symend > start && sym_end_within_boundary);
1887 }
1888
1889 static bfd_boolean
1890 avr_should_increase_sym_size (symvalue symval,
1891 symvalue symend,
1892 bfd_vma start,
1893 bfd_vma end,
1894 bfd_boolean did_pad)
1895 {
1896 return avr_should_move_sym (symval, start, end, did_pad)
1897 && symend >= end && did_pad;
1898 }
1899
1900 /* Delete some bytes from a section while changing the size of an instruction.
1901 The parameter "addr" denotes the section-relative offset pointing just
1902 behind the shrinked instruction. "addr+count" point at the first
1903 byte just behind the original unshrinked instruction. If delete_shrinks_insn
1904 is FALSE, we are deleting redundant padding bytes from relax_info prop
1905 record handling. In that case, addr is section-relative offset of start
1906 of padding, and count is the number of padding bytes to delete. */
1907
1908 static bfd_boolean
1909 elf32_avr_relax_delete_bytes (bfd *abfd,
1910 asection *sec,
1911 bfd_vma addr,
1912 int count,
1913 bfd_boolean delete_shrinks_insn)
1914 {
1915 Elf_Internal_Shdr *symtab_hdr;
1916 unsigned int sec_shndx;
1917 bfd_byte *contents;
1918 Elf_Internal_Rela *irel, *irelend;
1919 Elf_Internal_Sym *isym;
1920 Elf_Internal_Sym *isymbuf = NULL;
1921 bfd_vma toaddr;
1922 struct elf_link_hash_entry **sym_hashes;
1923 struct elf_link_hash_entry **end_hashes;
1924 unsigned int symcount;
1925 struct avr_relax_info *relax_info;
1926 struct avr_property_record *prop_record = NULL;
1927 bfd_boolean did_shrink = FALSE;
1928 bfd_boolean did_pad = FALSE;
1929
1930 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1931 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1932 contents = elf_section_data (sec)->this_hdr.contents;
1933 relax_info = get_avr_relax_info (sec);
1934
1935 toaddr = sec->size;
1936
1937 if (relax_info->records.count > 0)
1938 {
1939 /* There should be no property record within the range of deleted
1940 bytes, however, there might be a property record for ADDR, this is
1941 how we handle alignment directives.
1942 Find the next (if any) property record after the deleted bytes. */
1943 unsigned int i;
1944
1945 for (i = 0; i < relax_info->records.count; ++i)
1946 {
1947 bfd_vma offset = relax_info->records.items [i].offset;
1948
1949 BFD_ASSERT (offset <= addr || offset >= (addr + count));
1950 if (offset >= (addr + count))
1951 {
1952 prop_record = &relax_info->records.items [i];
1953 toaddr = offset;
1954 break;
1955 }
1956 }
1957 }
1958
1959 irel = elf_section_data (sec)->relocs;
1960 irelend = irel + sec->reloc_count;
1961
1962 /* Actually delete the bytes. */
1963 if (toaddr - addr - count > 0)
1964 {
1965 memmove (contents + addr, contents + addr + count,
1966 (size_t) (toaddr - addr - count));
1967 did_shrink = TRUE;
1968 }
1969 if (prop_record == NULL)
1970 {
1971 sec->size -= count;
1972 did_shrink = TRUE;
1973 }
1974 else
1975 {
1976 /* Use the property record to fill in the bytes we've opened up. */
1977 int fill = 0;
1978 switch (prop_record->type)
1979 {
1980 case RECORD_ORG_AND_FILL:
1981 fill = prop_record->data.org.fill;
1982 /* Fall through. */
1983 case RECORD_ORG:
1984 break;
1985 case RECORD_ALIGN_AND_FILL:
1986 fill = prop_record->data.align.fill;
1987 /* Fall through. */
1988 case RECORD_ALIGN:
1989 prop_record->data.align.preceding_deleted += count;
1990 break;
1991 };
1992 /* If toaddr == (addr + count), then we didn't delete anything, yet
1993 we fill count bytes backwards from toaddr. This is still ok - we
1994 end up overwriting the bytes we would have deleted. We just need
1995 to remember we didn't delete anything i.e. don't set did_shrink,
1996 so that we don't corrupt reloc offsets or symbol values.*/
1997 memset (contents + toaddr - count, fill, count);
1998 did_pad = TRUE;
1999 }
2000
2001 if (!did_shrink)
2002 return TRUE;
2003
2004 /* Adjust all the reloc addresses. */
2005 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
2006 {
2007 bfd_vma old_reloc_address;
2008
2009 old_reloc_address = (sec->output_section->vma
2010 + sec->output_offset + irel->r_offset);
2011
2012 /* Get the new reloc address. */
2013 if ((irel->r_offset > addr
2014 && irel->r_offset < toaddr))
2015 {
2016 if (debug_relax)
2017 printf ("Relocation at address 0x%x needs to be moved.\n"
2018 "Old section offset: 0x%x, New section offset: 0x%x \n",
2019 (unsigned int) old_reloc_address,
2020 (unsigned int) irel->r_offset,
2021 (unsigned int) ((irel->r_offset) - count));
2022
2023 irel->r_offset -= count;
2024 }
2025
2026 }
2027
2028 /* The reloc's own addresses are now ok. However, we need to readjust
2029 the reloc's addend, i.e. the reloc's value if two conditions are met:
2030 1.) the reloc is relative to a symbol in this section that
2031 is located in front of the shrinked instruction
2032 2.) symbol plus addend end up behind the shrinked instruction.
2033
2034 The most common case where this happens are relocs relative to
2035 the section-start symbol.
2036
2037 This step needs to be done for all of the sections of the bfd. */
2038
2039 {
2040 struct bfd_section *isec;
2041
2042 for (isec = abfd->sections; isec; isec = isec->next)
2043 {
2044 bfd_vma symval;
2045 bfd_vma shrinked_insn_address;
2046
2047 if (isec->reloc_count == 0)
2048 continue;
2049
2050 shrinked_insn_address = (sec->output_section->vma
2051 + sec->output_offset + addr);
2052 if (delete_shrinks_insn)
2053 shrinked_insn_address -= count;
2054
2055 irel = elf_section_data (isec)->relocs;
2056 /* PR 12161: Read in the relocs for this section if necessary. */
2057 if (irel == NULL)
2058 irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2059
2060 for (irelend = irel + isec->reloc_count;
2061 irel < irelend;
2062 irel++)
2063 {
2064 /* Read this BFD's local symbols if we haven't done
2065 so already. */
2066 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2067 {
2068 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2069 if (isymbuf == NULL)
2070 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2071 symtab_hdr->sh_info, 0,
2072 NULL, NULL, NULL);
2073 if (isymbuf == NULL)
2074 return FALSE;
2075 }
2076
2077 /* Get the value of the symbol referred to by the reloc. */
2078 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2079 {
2080 /* A local symbol. */
2081 asection *sym_sec;
2082
2083 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2084 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2085 symval = isym->st_value;
2086 /* If the reloc is absolute, it will not have
2087 a symbol or section associated with it. */
2088 if (sym_sec == sec)
2089 {
2090 /* If there is an alignment boundary, we only need to
2091 adjust addends that end up below the boundary. */
2092 bfd_vma shrink_boundary = (toaddr
2093 + sec->output_section->vma
2094 + sec->output_offset);
2095
2096 symval += sym_sec->output_section->vma
2097 + sym_sec->output_offset;
2098
2099 if (debug_relax)
2100 printf ("Checking if the relocation's "
2101 "addend needs corrections.\n"
2102 "Address of anchor symbol: 0x%x \n"
2103 "Address of relocation target: 0x%x \n"
2104 "Address of relaxed insn: 0x%x \n",
2105 (unsigned int) symval,
2106 (unsigned int) (symval + irel->r_addend),
2107 (unsigned int) shrinked_insn_address);
2108
2109 elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel,
2110 symval,
2111 shrinked_insn_address,
2112 shrink_boundary,
2113 count);
2114 }
2115 /* else...Reference symbol is absolute. No adjustment needed. */
2116 }
2117 /* else...Reference symbol is extern. No need for adjusting
2118 the addend. */
2119 }
2120 }
2121 }
2122
2123 /* Adjust the local symbols defined in this section. */
2124 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2125 /* Fix PR 9841, there may be no local symbols. */
2126 if (isym != NULL)
2127 {
2128 Elf_Internal_Sym *isymend;
2129
2130 isymend = isym + symtab_hdr->sh_info;
2131 for (; isym < isymend; isym++)
2132 {
2133 if (isym->st_shndx == sec_shndx)
2134 {
2135 symvalue symval = isym->st_value;
2136 symvalue symend = symval + isym->st_size;
2137 if (avr_should_reduce_sym_size (symval, symend,
2138 addr, toaddr, did_pad))
2139 {
2140 /* If this assert fires then we have a symbol that ends
2141 part way through an instruction. Does that make
2142 sense? */
2143 BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
2144 isym->st_size -= count;
2145 }
2146 else if (avr_should_increase_sym_size (symval, symend,
2147 addr, toaddr, did_pad))
2148 isym->st_size += count;
2149
2150 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2151 isym->st_value -= count;
2152 }
2153 }
2154 }
2155
2156 /* Now adjust the global symbols defined in this section. */
2157 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2158 - symtab_hdr->sh_info);
2159 sym_hashes = elf_sym_hashes (abfd);
2160 end_hashes = sym_hashes + symcount;
2161 for (; sym_hashes < end_hashes; sym_hashes++)
2162 {
2163 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2164 if ((sym_hash->root.type == bfd_link_hash_defined
2165 || sym_hash->root.type == bfd_link_hash_defweak)
2166 && sym_hash->root.u.def.section == sec)
2167 {
2168 symvalue symval = sym_hash->root.u.def.value;
2169 symvalue symend = symval + sym_hash->size;
2170
2171 if (avr_should_reduce_sym_size (symval, symend,
2172 addr, toaddr, did_pad))
2173 {
2174 /* If this assert fires then we have a symbol that ends
2175 part way through an instruction. Does that make
2176 sense? */
2177 BFD_ASSERT (symend >= addr + count);
2178 sym_hash->size -= count;
2179 }
2180 else if (avr_should_increase_sym_size (symval, symend,
2181 addr, toaddr, did_pad))
2182 sym_hash->size += count;
2183
2184 if (avr_should_move_sym (symval, addr, toaddr, did_pad))
2185 sym_hash->root.u.def.value -= count;
2186 }
2187 }
2188
2189 return TRUE;
2190 }
2191
2192 static Elf_Internal_Sym *
2193 retrieve_local_syms (bfd *input_bfd)
2194 {
2195 Elf_Internal_Shdr *symtab_hdr;
2196 Elf_Internal_Sym *isymbuf;
2197 size_t locsymcount;
2198
2199 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2200 locsymcount = symtab_hdr->sh_info;
2201
2202 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2203 if (isymbuf == NULL && locsymcount != 0)
2204 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
2205 NULL, NULL, NULL);
2206
2207 /* Save the symbols for this input file so they won't be read again. */
2208 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
2209 symtab_hdr->contents = (unsigned char *) isymbuf;
2210
2211 return isymbuf;
2212 }
2213
2214 /* Get the input section for a given symbol index.
2215 If the symbol is:
2216 . a section symbol, return the section;
2217 . a common symbol, return the common section;
2218 . an undefined symbol, return the undefined section;
2219 . an indirect symbol, follow the links;
2220 . an absolute value, return the absolute section. */
2221
2222 static asection *
2223 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
2224 {
2225 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2226 asection *target_sec = NULL;
2227 if (r_symndx < symtab_hdr->sh_info)
2228 {
2229 Elf_Internal_Sym *isymbuf;
2230 unsigned int section_index;
2231
2232 isymbuf = retrieve_local_syms (abfd);
2233 section_index = isymbuf[r_symndx].st_shndx;
2234
2235 if (section_index == SHN_UNDEF)
2236 target_sec = bfd_und_section_ptr;
2237 else if (section_index == SHN_ABS)
2238 target_sec = bfd_abs_section_ptr;
2239 else if (section_index == SHN_COMMON)
2240 target_sec = bfd_com_section_ptr;
2241 else
2242 target_sec = bfd_section_from_elf_index (abfd, section_index);
2243 }
2244 else
2245 {
2246 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2247 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
2248
2249 while (h->root.type == bfd_link_hash_indirect
2250 || h->root.type == bfd_link_hash_warning)
2251 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2252
2253 switch (h->root.type)
2254 {
2255 case bfd_link_hash_defined:
2256 case bfd_link_hash_defweak:
2257 target_sec = h->root.u.def.section;
2258 break;
2259 case bfd_link_hash_common:
2260 target_sec = bfd_com_section_ptr;
2261 break;
2262 case bfd_link_hash_undefined:
2263 case bfd_link_hash_undefweak:
2264 target_sec = bfd_und_section_ptr;
2265 break;
2266 default: /* New indirect warning. */
2267 target_sec = bfd_und_section_ptr;
2268 break;
2269 }
2270 }
2271 return target_sec;
2272 }
2273
2274 /* Get the section-relative offset for a symbol number. */
2275
2276 static bfd_vma
2277 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
2278 {
2279 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2280 bfd_vma offset = 0;
2281
2282 if (r_symndx < symtab_hdr->sh_info)
2283 {
2284 Elf_Internal_Sym *isymbuf;
2285 isymbuf = retrieve_local_syms (abfd);
2286 offset = isymbuf[r_symndx].st_value;
2287 }
2288 else
2289 {
2290 unsigned long indx = r_symndx - symtab_hdr->sh_info;
2291 struct elf_link_hash_entry *h =
2292 elf_sym_hashes (abfd)[indx];
2293
2294 while (h->root.type == bfd_link_hash_indirect
2295 || h->root.type == bfd_link_hash_warning)
2296 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2297 if (h->root.type == bfd_link_hash_defined
2298 || h->root.type == bfd_link_hash_defweak)
2299 offset = h->root.u.def.value;
2300 }
2301 return offset;
2302 }
2303
2304 /* Iterate over the property records in R_LIST, and copy each record into
2305 the list of records within the relaxation information for the section to
2306 which the record applies. */
2307
2308 static void
2309 avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
2310 {
2311 unsigned int i;
2312
2313 for (i = 0; i < r_list->record_count; ++i)
2314 {
2315 struct avr_relax_info *relax_info;
2316
2317 relax_info = get_avr_relax_info (r_list->records [i].section);
2318 BFD_ASSERT (relax_info != NULL);
2319
2320 if (relax_info->records.count
2321 == relax_info->records.allocated)
2322 {
2323 /* Allocate more space. */
2324 bfd_size_type size;
2325
2326 relax_info->records.allocated += 10;
2327 size = (sizeof (struct avr_property_record)
2328 * relax_info->records.allocated);
2329 relax_info->records.items
2330 = bfd_realloc (relax_info->records.items, size);
2331 }
2332
2333 memcpy (&relax_info->records.items [relax_info->records.count],
2334 &r_list->records [i],
2335 sizeof (struct avr_property_record));
2336 relax_info->records.count++;
2337 }
2338 }
2339
2340 /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
2341 ordering callback from QSORT. */
2342
2343 static int
2344 avr_property_record_compare (const void *ap, const void *bp)
2345 {
2346 const struct avr_property_record *a
2347 = (struct avr_property_record *) ap;
2348 const struct avr_property_record *b
2349 = (struct avr_property_record *) bp;
2350
2351 if (a->offset != b->offset)
2352 return (a->offset - b->offset);
2353
2354 if (a->section != b->section)
2355 return bfd_section_vma (a->section) - bfd_section_vma (b->section);
2356
2357 return (a->type - b->type);
2358 }
2359
2360 /* Load all of the avr property sections from all of the bfd objects
2361 referenced from LINK_INFO. All of the records within each property
2362 section are assigned to the STRUCT AVR_RELAX_INFO within the section
2363 specific data of the appropriate section. */
2364
2365 static void
2366 avr_load_all_property_sections (struct bfd_link_info *link_info)
2367 {
2368 bfd *abfd;
2369 asection *sec;
2370
2371 /* Initialize the per-section relaxation info. */
2372 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2373 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2374 {
2375 init_avr_relax_info (sec);
2376 }
2377
2378 /* Load the descriptor tables from .avr.prop sections. */
2379 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2380 {
2381 struct avr_property_record_list *r_list;
2382
2383 r_list = avr_elf32_load_property_records (abfd);
2384 if (r_list != NULL)
2385 avr_elf32_assign_records_to_sections (r_list);
2386
2387 free (r_list);
2388 }
2389
2390 /* Now, for every section, ensure that the descriptor list in the
2391 relaxation data is sorted by ascending offset within the section. */
2392 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
2393 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2394 {
2395 struct avr_relax_info *relax_info = get_avr_relax_info (sec);
2396 if (relax_info && relax_info->records.count > 0)
2397 {
2398 unsigned int i;
2399
2400 qsort (relax_info->records.items,
2401 relax_info->records.count,
2402 sizeof (struct avr_property_record),
2403 avr_property_record_compare);
2404
2405 /* For debug purposes, list all the descriptors. */
2406 for (i = 0; i < relax_info->records.count; ++i)
2407 {
2408 switch (relax_info->records.items [i].type)
2409 {
2410 case RECORD_ORG:
2411 break;
2412 case RECORD_ORG_AND_FILL:
2413 break;
2414 case RECORD_ALIGN:
2415 break;
2416 case RECORD_ALIGN_AND_FILL:
2417 break;
2418 };
2419 }
2420 }
2421 }
2422 }
2423
2424 /* This function handles relaxing for the avr.
2425 Many important relaxing opportunities within functions are already
2426 realized by the compiler itself.
2427 Here we try to replace call (4 bytes) -> rcall (2 bytes)
2428 and jump -> rjmp (safes also 2 bytes).
2429 As well we now optimize seqences of
2430 - call/rcall function
2431 - ret
2432 to yield
2433 - jmp/rjmp function
2434 - ret
2435 . In case that within a sequence
2436 - jmp/rjmp label
2437 - ret
2438 the ret could no longer be reached it is optimized away. In order
2439 to check if the ret is no longer needed, it is checked that the ret's address
2440 is not the target of a branch or jump within the same section, it is checked
2441 that there is no skip instruction before the jmp/rjmp and that there
2442 is no local or global label place at the address of the ret.
2443
2444 We refrain from relaxing within sections ".vectors" and
2445 ".jumptables" in order to maintain the position of the instructions.
2446 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
2447 if possible. (In future one could possibly use the space of the nop
2448 for the first instruction of the irq service function.
2449
2450 The .jumptables sections is meant to be used for a future tablejump variant
2451 for the devices with 3-byte program counter where the table itself
2452 contains 4-byte jump instructions whose relative offset must not
2453 be changed. */
2454
2455 static bfd_boolean
2456 elf32_avr_relax_section (bfd *abfd,
2457 asection *sec,
2458 struct bfd_link_info *link_info,
2459 bfd_boolean *again)
2460 {
2461 Elf_Internal_Shdr *symtab_hdr;
2462 Elf_Internal_Rela *internal_relocs;
2463 Elf_Internal_Rela *irel, *irelend;
2464 bfd_byte *contents = NULL;
2465 Elf_Internal_Sym *isymbuf = NULL;
2466 struct elf32_avr_link_hash_table *htab;
2467 static bfd_boolean relaxation_initialised = FALSE;
2468
2469 if (!relaxation_initialised)
2470 {
2471 relaxation_initialised = TRUE;
2472
2473 /* Load entries from the .avr.prop sections. */
2474 avr_load_all_property_sections (link_info);
2475 }
2476
2477 /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
2478 relaxing. Such shrinking can cause issues for the sections such
2479 as .vectors and .jumptables. Instead the unused bytes should be
2480 filled with nop instructions. */
2481 bfd_boolean shrinkable = TRUE;
2482
2483 if (!strcmp (sec->name,".vectors")
2484 || !strcmp (sec->name,".jumptables"))
2485 shrinkable = FALSE;
2486
2487 if (bfd_link_relocatable (link_info))
2488 (*link_info->callbacks->einfo)
2489 (_("%P%F: --relax and -r may not be used together\n"));
2490
2491 htab = avr_link_hash_table (link_info);
2492 if (htab == NULL)
2493 return FALSE;
2494
2495 /* Assume nothing changes. */
2496 *again = FALSE;
2497
2498 if ((!htab->no_stubs) && (sec == htab->stub_sec))
2499 {
2500 /* We are just relaxing the stub section.
2501 Let's calculate the size needed again. */
2502 bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
2503
2504 if (debug_relax)
2505 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
2506 (int) last_estimated_stub_section_size);
2507
2508 elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
2509 link_info, FALSE);
2510
2511 /* Check if the number of trampolines changed. */
2512 if (last_estimated_stub_section_size != htab->stub_sec->size)
2513 *again = TRUE;
2514
2515 if (debug_relax)
2516 printf ("Size of stub section after this pass: %i\n",
2517 (int) htab->stub_sec->size);
2518
2519 return TRUE;
2520 }
2521
2522 /* We don't have to do anything for a relocatable link, if
2523 this section does not have relocs, or if this is not a
2524 code section. */
2525 if (bfd_link_relocatable (link_info)
2526 || (sec->flags & SEC_RELOC) == 0
2527 || sec->reloc_count == 0
2528 || (sec->flags & SEC_CODE) == 0)
2529 return TRUE;
2530
2531 /* Check if the object file to relax uses internal symbols so that we
2532 could fix up the relocations. */
2533 if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
2534 return TRUE;
2535
2536 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2537
2538 /* Get a copy of the native relocations. */
2539 internal_relocs = (_bfd_elf_link_read_relocs
2540 (abfd, sec, NULL, NULL, link_info->keep_memory));
2541 if (internal_relocs == NULL)
2542 goto error_return;
2543
2544 /* Walk through the relocs looking for relaxing opportunities. */
2545 irelend = internal_relocs + sec->reloc_count;
2546 for (irel = internal_relocs; irel < irelend; irel++)
2547 {
2548 bfd_vma symval;
2549
2550 if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
2551 && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
2552 && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
2553 continue;
2554
2555 /* Get the section contents if we haven't done so already. */
2556 if (contents == NULL)
2557 {
2558 /* Get cached copy if it exists. */
2559 if (elf_section_data (sec)->this_hdr.contents != NULL)
2560 contents = elf_section_data (sec)->this_hdr.contents;
2561 else
2562 {
2563 /* Go get them off disk. */
2564 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2565 goto error_return;
2566 }
2567 }
2568
2569 /* Read this BFD's local symbols if we haven't done so already. */
2570 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2571 {
2572 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2573 if (isymbuf == NULL)
2574 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2575 symtab_hdr->sh_info, 0,
2576 NULL, NULL, NULL);
2577 if (isymbuf == NULL)
2578 goto error_return;
2579 }
2580
2581
2582 /* Get the value of the symbol referred to by the reloc. */
2583 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2584 {
2585 /* A local symbol. */
2586 Elf_Internal_Sym *isym;
2587 asection *sym_sec;
2588
2589 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2590 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2591 symval = isym->st_value;
2592 /* If the reloc is absolute, it will not have
2593 a symbol or section associated with it. */
2594 if (sym_sec)
2595 symval += sym_sec->output_section->vma
2596 + sym_sec->output_offset;
2597 }
2598 else
2599 {
2600 unsigned long indx;
2601 struct elf_link_hash_entry *h;
2602
2603 /* An external symbol. */
2604 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2605 h = elf_sym_hashes (abfd)[indx];
2606 BFD_ASSERT (h != NULL);
2607 if (h->root.type != bfd_link_hash_defined
2608 && h->root.type != bfd_link_hash_defweak)
2609 /* This appears to be a reference to an undefined
2610 symbol. Just ignore it--it will be caught by the
2611 regular reloc processing. */
2612 continue;
2613
2614 symval = (h->root.u.def.value
2615 + h->root.u.def.section->output_section->vma
2616 + h->root.u.def.section->output_offset);
2617 }
2618
2619 /* For simplicity of coding, we are going to modify the section
2620 contents, the section relocs, and the BFD symbol table. We
2621 must tell the rest of the code not to free up this
2622 information. It would be possible to instead create a table
2623 of changes which have to be made, as is done in coff-mips.c;
2624 that would be more work, but would require less memory when
2625 the linker is run. */
2626 switch (ELF32_R_TYPE (irel->r_info))
2627 {
2628 /* Try to turn a 22-bit absolute call/jump into an 13-bit
2629 pc-relative rcall/rjmp. */
2630 case R_AVR_CALL:
2631 {
2632 bfd_vma value = symval + irel->r_addend;
2633 bfd_vma dot, gap;
2634 int distance_short_enough = 0;
2635
2636 /* Get the address of this instruction. */
2637 dot = (sec->output_section->vma
2638 + sec->output_offset + irel->r_offset);
2639
2640 /* Compute the distance from this insn to the branch target. */
2641 gap = value - dot;
2642
2643 /* The ISA manual states that addressable range is PC - 2k + 1 to
2644 PC + 2k. In bytes, that would be -4094 <= PC <= 4096. The range
2645 is shifted one word to the right, because pc-relative instructions
2646 implicitly add one word i.e. rjmp 0 jumps to next insn, not the
2647 current one.
2648 Therefore, for the !shrinkable case, the range is as above.
2649 If shrinkable, then the current code only deletes bytes 3 and
2650 4 of the absolute call/jmp, so the forward jump range increases
2651 by 2 bytes, but the backward (negative) jump range remains
2652 the same. */
2653
2654
2655 /* Check if the gap falls in the range that can be accommodated
2656 in 13bits signed (It is 12bits when encoded, as we deal with
2657 word addressing). */
2658 if (!shrinkable && ((int) gap >= -4094 && (int) gap <= 4096))
2659 distance_short_enough = 1;
2660 /* If shrinkable, then we can check for a range of distance which
2661 is two bytes farther on the positive direction because the call
2662 or jump target will be closer by two bytes after the
2663 relaxation. */
2664 else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4098))
2665 distance_short_enough = 1;
2666
2667 /* Here we handle the wrap-around case. E.g. for a 16k device
2668 we could use a rjmp to jump from address 0x100 to 0x3d00!
2669 In order to make this work properly, we need to fill the
2670 vaiable avr_pc_wrap_around with the appropriate value.
2671 I.e. 0x4000 for a 16k device. */
2672 {
2673 /* Shrinking the code size makes the gaps larger in the
2674 case of wrap-arounds. So we use a heuristical safety
2675 margin to avoid that during relax the distance gets
2676 again too large for the short jumps. Let's assume
2677 a typical code-size reduction due to relax for a
2678 16k device of 600 bytes. So let's use twice the
2679 typical value as safety margin. */
2680 int rgap;
2681 int safety_margin;
2682
2683 int assumed_shrink = 600;
2684 if (avr_pc_wrap_around > 0x4000)
2685 assumed_shrink = 900;
2686
2687 safety_margin = 2 * assumed_shrink;
2688
2689 rgap = avr_relative_distance_considering_wrap_around (gap);
2690
2691 if (rgap >= (-4092 + safety_margin)
2692 && rgap <= (4094 - safety_margin))
2693 distance_short_enough = 1;
2694 }
2695
2696 if (distance_short_enough)
2697 {
2698 unsigned char code_msb;
2699 unsigned char code_lsb;
2700
2701 if (debug_relax)
2702 printf ("shrinking jump/call instruction at address 0x%x"
2703 " in section %s\n\n",
2704 (int) dot, sec->name);
2705
2706 /* Note that we've changed the relocs, section contents,
2707 etc. */
2708 elf_section_data (sec)->relocs = internal_relocs;
2709 elf_section_data (sec)->this_hdr.contents = contents;
2710 symtab_hdr->contents = (unsigned char *) isymbuf;
2711
2712 /* Get the instruction code for relaxing. */
2713 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
2714 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2715
2716 /* Mask out the relocation bits. */
2717 code_msb &= 0x94;
2718 code_lsb &= 0x0E;
2719 if (code_msb == 0x94 && code_lsb == 0x0E)
2720 {
2721 /* we are changing call -> rcall . */
2722 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2723 bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
2724 }
2725 else if (code_msb == 0x94 && code_lsb == 0x0C)
2726 {
2727 /* we are changeing jump -> rjmp. */
2728 bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
2729 bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
2730 }
2731 else
2732 abort ();
2733
2734 /* Fix the relocation's type. */
2735 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2736 R_AVR_13_PCREL);
2737
2738 /* We should not modify the ordering if 'shrinkable' is
2739 FALSE. */
2740 if (!shrinkable)
2741 {
2742 /* Let's insert a nop. */
2743 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
2744 bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
2745 }
2746 else
2747 {
2748 /* Delete two bytes of data. */
2749 if (!elf32_avr_relax_delete_bytes (abfd, sec,
2750 irel->r_offset + 2, 2,
2751 TRUE))
2752 goto error_return;
2753
2754 /* That will change things, so, we should relax again.
2755 Note that this is not required, and it may be slow. */
2756 *again = TRUE;
2757 }
2758 }
2759 }
2760 /* Fall through. */
2761
2762 default:
2763 {
2764 unsigned char code_msb;
2765 unsigned char code_lsb;
2766 bfd_vma dot;
2767
2768 code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
2769 code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
2770
2771 /* Get the address of this instruction. */
2772 dot = (sec->output_section->vma
2773 + sec->output_offset + irel->r_offset);
2774
2775 /* Here we look for rcall/ret or call/ret sequences that could be
2776 safely replaced by rjmp/ret or jmp/ret. */
2777 if (((code_msb & 0xf0) == 0xd0)
2778 && avr_replace_call_ret_sequences)
2779 {
2780 /* This insn is a rcall. */
2781 unsigned char next_insn_msb = 0;
2782 unsigned char next_insn_lsb = 0;
2783
2784 if (irel->r_offset + 3 < sec->size)
2785 {
2786 next_insn_msb =
2787 bfd_get_8 (abfd, contents + irel->r_offset + 3);
2788 next_insn_lsb =
2789 bfd_get_8 (abfd, contents + irel->r_offset + 2);
2790 }
2791
2792 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2793 {
2794 /* The next insn is a ret. We now convert the rcall insn
2795 into a rjmp instruction. */
2796 code_msb &= 0xef;
2797 bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
2798 if (debug_relax)
2799 printf ("converted rcall/ret sequence at address 0x%x"
2800 " into rjmp/ret sequence. Section is %s\n\n",
2801 (int) dot, sec->name);
2802 *again = TRUE;
2803 break;
2804 }
2805 }
2806 else if ((0x94 == (code_msb & 0xfe))
2807 && (0x0e == (code_lsb & 0x0e))
2808 && avr_replace_call_ret_sequences)
2809 {
2810 /* This insn is a call. */
2811 unsigned char next_insn_msb = 0;
2812 unsigned char next_insn_lsb = 0;
2813
2814 if (irel->r_offset + 5 < sec->size)
2815 {
2816 next_insn_msb =
2817 bfd_get_8 (abfd, contents + irel->r_offset + 5);
2818 next_insn_lsb =
2819 bfd_get_8 (abfd, contents + irel->r_offset + 4);
2820 }
2821
2822 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2823 {
2824 /* The next insn is a ret. We now convert the call insn
2825 into a jmp instruction. */
2826
2827 code_lsb &= 0xfd;
2828 bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
2829 if (debug_relax)
2830 printf ("converted call/ret sequence at address 0x%x"
2831 " into jmp/ret sequence. Section is %s\n\n",
2832 (int) dot, sec->name);
2833 *again = TRUE;
2834 break;
2835 }
2836 }
2837 else if ((0xc0 == (code_msb & 0xf0))
2838 || ((0x94 == (code_msb & 0xfe))
2839 && (0x0c == (code_lsb & 0x0e))))
2840 {
2841 /* This insn is a rjmp or a jmp. */
2842 unsigned char next_insn_msb = 0;
2843 unsigned char next_insn_lsb = 0;
2844 int insn_size;
2845
2846 if (0xc0 == (code_msb & 0xf0))
2847 insn_size = 2; /* rjmp insn */
2848 else
2849 insn_size = 4; /* jmp insn */
2850
2851 if (irel->r_offset + insn_size + 1 < sec->size)
2852 {
2853 next_insn_msb =
2854 bfd_get_8 (abfd, contents + irel->r_offset
2855 + insn_size + 1);
2856 next_insn_lsb =
2857 bfd_get_8 (abfd, contents + irel->r_offset
2858 + insn_size);
2859 }
2860
2861 if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
2862 {
2863 /* The next insn is a ret. We possibly could delete
2864 this ret. First we need to check for preceding
2865 sbis/sbic/sbrs or cpse "skip" instructions. */
2866
2867 int there_is_preceding_non_skip_insn = 1;
2868 bfd_vma address_of_ret;
2869
2870 address_of_ret = dot + insn_size;
2871
2872 if (debug_relax && (insn_size == 2))
2873 printf ("found rjmp / ret sequence at address 0x%x\n",
2874 (int) dot);
2875 if (debug_relax && (insn_size == 4))
2876 printf ("found jmp / ret sequence at address 0x%x\n",
2877 (int) dot);
2878
2879 /* We have to make sure that there is a preceding insn. */
2880 if (irel->r_offset >= 2)
2881 {
2882 unsigned char preceding_msb;
2883 unsigned char preceding_lsb;
2884
2885 preceding_msb =
2886 bfd_get_8 (abfd, contents + irel->r_offset - 1);
2887 preceding_lsb =
2888 bfd_get_8 (abfd, contents + irel->r_offset - 2);
2889
2890 /* sbic. */
2891 if (0x99 == preceding_msb)
2892 there_is_preceding_non_skip_insn = 0;
2893
2894 /* sbis. */
2895 if (0x9b == preceding_msb)
2896 there_is_preceding_non_skip_insn = 0;
2897
2898 /* sbrc */
2899 if ((0xfc == (preceding_msb & 0xfe)
2900 && (0x00 == (preceding_lsb & 0x08))))
2901 there_is_preceding_non_skip_insn = 0;
2902
2903 /* sbrs */
2904 if ((0xfe == (preceding_msb & 0xfe)
2905 && (0x00 == (preceding_lsb & 0x08))))
2906 there_is_preceding_non_skip_insn = 0;
2907
2908 /* cpse */
2909 if (0x10 == (preceding_msb & 0xfc))
2910 there_is_preceding_non_skip_insn = 0;
2911
2912 if (there_is_preceding_non_skip_insn == 0)
2913 if (debug_relax)
2914 printf ("preceding skip insn prevents deletion of"
2915 " ret insn at Addy 0x%x in section %s\n",
2916 (int) dot + 2, sec->name);
2917 }
2918 else
2919 {
2920 /* There is no previous instruction. */
2921 there_is_preceding_non_skip_insn = 0;
2922 }
2923
2924 if (there_is_preceding_non_skip_insn)
2925 {
2926 /* We now only have to make sure that there is no
2927 local label defined at the address of the ret
2928 instruction and that there is no local relocation
2929 in this section pointing to the ret. */
2930
2931 int deleting_ret_is_safe = 1;
2932 unsigned int section_offset_of_ret_insn =
2933 irel->r_offset + insn_size;
2934 Elf_Internal_Sym *isym, *isymend;
2935 unsigned int sec_shndx;
2936 struct bfd_section *isec;
2937
2938 sec_shndx =
2939 _bfd_elf_section_from_bfd_section (abfd, sec);
2940
2941 /* Check for local symbols. */
2942 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
2943 isymend = isym + symtab_hdr->sh_info;
2944 /* PR 6019: There may not be any local symbols. */
2945 for (; isym != NULL && isym < isymend; isym++)
2946 {
2947 if (isym->st_value == section_offset_of_ret_insn
2948 && isym->st_shndx == sec_shndx)
2949 {
2950 deleting_ret_is_safe = 0;
2951 if (debug_relax)
2952 printf ("local label prevents deletion of ret "
2953 "insn at address 0x%x\n",
2954 (int) dot + insn_size);
2955 }
2956 }
2957
2958 /* Now check for global symbols. */
2959 {
2960 int symcount;
2961 struct elf_link_hash_entry **sym_hashes;
2962 struct elf_link_hash_entry **end_hashes;
2963
2964 symcount = (symtab_hdr->sh_size
2965 / sizeof (Elf32_External_Sym)
2966 - symtab_hdr->sh_info);
2967 sym_hashes = elf_sym_hashes (abfd);
2968 end_hashes = sym_hashes + symcount;
2969 for (; sym_hashes < end_hashes; sym_hashes++)
2970 {
2971 struct elf_link_hash_entry *sym_hash =
2972 *sym_hashes;
2973 if ((sym_hash->root.type == bfd_link_hash_defined
2974 || sym_hash->root.type ==
2975 bfd_link_hash_defweak)
2976 && sym_hash->root.u.def.section == sec
2977 && sym_hash->root.u.def.value == section_offset_of_ret_insn)
2978 {
2979 deleting_ret_is_safe = 0;
2980 if (debug_relax)
2981 printf ("global label prevents deletion of "
2982 "ret insn at address 0x%x\n",
2983 (int) dot + insn_size);
2984 }
2985 }
2986 }
2987
2988 /* Now we check for relocations pointing to ret. */
2989 for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
2990 {
2991 Elf_Internal_Rela *rel;
2992 Elf_Internal_Rela *relend;
2993
2994 rel = elf_section_data (isec)->relocs;
2995 if (rel == NULL)
2996 rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
2997
2998 relend = rel + isec->reloc_count;
2999
3000 for (; rel && rel < relend; rel++)
3001 {
3002 bfd_vma reloc_target = 0;
3003
3004 /* Read this BFD's local symbols if we haven't
3005 done so already. */
3006 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
3007 {
3008 isymbuf = (Elf_Internal_Sym *)
3009 symtab_hdr->contents;
3010 if (isymbuf == NULL)
3011 isymbuf = bfd_elf_get_elf_syms
3012 (abfd,
3013 symtab_hdr,
3014 symtab_hdr->sh_info, 0,
3015 NULL, NULL, NULL);
3016 if (isymbuf == NULL)
3017 break;
3018 }
3019
3020 /* Get the value of the symbol referred to
3021 by the reloc. */
3022 if (ELF32_R_SYM (rel->r_info)
3023 < symtab_hdr->sh_info)
3024 {
3025 /* A local symbol. */
3026 asection *sym_sec;
3027
3028 isym = isymbuf
3029 + ELF32_R_SYM (rel->r_info);
3030 sym_sec = bfd_section_from_elf_index
3031 (abfd, isym->st_shndx);
3032 symval = isym->st_value;
3033
3034 /* If the reloc is absolute, it will not
3035 have a symbol or section associated
3036 with it. */
3037
3038 if (sym_sec)
3039 {
3040 symval +=
3041 sym_sec->output_section->vma
3042 + sym_sec->output_offset;
3043 reloc_target = symval + rel->r_addend;
3044 }
3045 else
3046 {
3047 reloc_target = symval + rel->r_addend;
3048 /* Reference symbol is absolute. */
3049 }
3050 }
3051 /* else ... reference symbol is extern. */
3052
3053 if (address_of_ret == reloc_target)
3054 {
3055 deleting_ret_is_safe = 0;
3056 if (debug_relax)
3057 printf ("ret from "
3058 "rjmp/jmp ret sequence at address"
3059 " 0x%x could not be deleted. ret"
3060 " is target of a relocation.\n",
3061 (int) address_of_ret);
3062 break;
3063 }
3064 }
3065 }
3066
3067 if (deleting_ret_is_safe)
3068 {
3069 if (debug_relax)
3070 printf ("unreachable ret instruction "
3071 "at address 0x%x deleted.\n",
3072 (int) dot + insn_size);
3073
3074 /* Delete two bytes of data. */
3075 if (!elf32_avr_relax_delete_bytes (abfd, sec,
3076 irel->r_offset + insn_size, 2,
3077 TRUE))
3078 goto error_return;
3079
3080 /* That will change things, so, we should relax
3081 again. Note that this is not required, and it
3082 may be slow. */
3083 *again = TRUE;
3084 break;
3085 }
3086 }
3087 }
3088 }
3089 break;
3090 }
3091 }
3092 }
3093
3094 if (!*again)
3095 {
3096 /* Look through all the property records in this section to see if
3097 there's any alignment records that can be moved. */
3098 struct avr_relax_info *relax_info;
3099
3100 relax_info = get_avr_relax_info (sec);
3101 if (relax_info->records.count > 0)
3102 {
3103 unsigned int i;
3104
3105 for (i = 0; i < relax_info->records.count; ++i)
3106 {
3107 switch (relax_info->records.items [i].type)
3108 {
3109 case RECORD_ORG:
3110 case RECORD_ORG_AND_FILL:
3111 break;
3112 case RECORD_ALIGN:
3113 case RECORD_ALIGN_AND_FILL:
3114 {
3115 struct avr_property_record *record;
3116 unsigned long bytes_to_align;
3117 int count = 0;
3118
3119 /* Look for alignment directives that have had enough
3120 bytes deleted before them, such that the directive
3121 can be moved backwards and still maintain the
3122 required alignment. */
3123 record = &relax_info->records.items [i];
3124 bytes_to_align
3125 = (unsigned long) (1 << record->data.align.bytes);
3126 while (record->data.align.preceding_deleted >=
3127 bytes_to_align)
3128 {
3129 record->data.align.preceding_deleted
3130 -= bytes_to_align;
3131 count += bytes_to_align;
3132 }
3133
3134 if (count > 0)
3135 {
3136 bfd_vma addr = record->offset;
3137
3138 /* We can delete COUNT bytes and this alignment
3139 directive will still be correctly aligned.
3140 First move the alignment directive, then delete
3141 the bytes. */
3142 record->offset -= count;
3143 elf32_avr_relax_delete_bytes (abfd, sec,
3144 addr - count,
3145 count, FALSE);
3146 *again = TRUE;
3147 }
3148 }
3149 break;
3150 }
3151 }
3152 }
3153 }
3154
3155 if (contents != NULL
3156 && elf_section_data (sec)->this_hdr.contents != contents)
3157 {
3158 if (! link_info->keep_memory)
3159 free (contents);
3160 else
3161 {
3162 /* Cache the section contents for elf_link_input_bfd. */
3163 elf_section_data (sec)->this_hdr.contents = contents;
3164 }
3165 }
3166
3167 if (elf_section_data (sec)->relocs != internal_relocs)
3168 free (internal_relocs);
3169
3170 return TRUE;
3171
3172 error_return:
3173 if (symtab_hdr->contents != (unsigned char *) isymbuf)
3174 free (isymbuf);
3175 if (elf_section_data (sec)->this_hdr.contents != contents)
3176 free (contents);
3177 if (elf_section_data (sec)->relocs != internal_relocs)
3178 free (internal_relocs);
3179
3180 return FALSE;
3181 }
3182
3183 /* This is a version of bfd_generic_get_relocated_section_contents
3184 which uses elf32_avr_relocate_section.
3185
3186 For avr it's essentially a cut and paste taken from the H8300 port.
3187 The author of the relaxation support patch for avr had absolutely no
3188 clue what is happening here but found out that this part of the code
3189 seems to be important. */
3190
3191 static bfd_byte *
3192 elf32_avr_get_relocated_section_contents (bfd *output_bfd,
3193 struct bfd_link_info *link_info,
3194 struct bfd_link_order *link_order,
3195 bfd_byte *data,
3196 bfd_boolean relocatable,
3197 asymbol **symbols)
3198 {
3199 Elf_Internal_Shdr *symtab_hdr;
3200 asection *input_section = link_order->u.indirect.section;
3201 bfd *input_bfd = input_section->owner;
3202 asection **sections = NULL;
3203 Elf_Internal_Rela *internal_relocs = NULL;
3204 Elf_Internal_Sym *isymbuf = NULL;
3205
3206 /* We only need to handle the case of relaxing, or of having a
3207 particular set of section contents, specially. */
3208 if (relocatable
3209 || elf_section_data (input_section)->this_hdr.contents == NULL)
3210 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3211 link_order, data,
3212 relocatable,
3213 symbols);
3214 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3215
3216 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3217 (size_t) input_section->size);
3218
3219 if ((input_section->flags & SEC_RELOC) != 0
3220 && input_section->reloc_count > 0)
3221 {
3222 asection **secpp;
3223 Elf_Internal_Sym *isym, *isymend;
3224 bfd_size_type amt;
3225
3226 internal_relocs = (_bfd_elf_link_read_relocs
3227 (input_bfd, input_section, NULL, NULL, FALSE));
3228 if (internal_relocs == NULL)
3229 goto error_return;
3230
3231 if (symtab_hdr->sh_info != 0)
3232 {
3233 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3234 if (isymbuf == NULL)
3235 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3236 symtab_hdr->sh_info, 0,
3237 NULL, NULL, NULL);
3238 if (isymbuf == NULL)
3239 goto error_return;
3240 }
3241
3242 amt = symtab_hdr->sh_info;
3243 amt *= sizeof (asection *);
3244 sections = bfd_malloc (amt);
3245 if (sections == NULL && amt != 0)
3246 goto error_return;
3247
3248 isymend = isymbuf + symtab_hdr->sh_info;
3249 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3250 {
3251 asection *isec;
3252
3253 if (isym->st_shndx == SHN_UNDEF)
3254 isec = bfd_und_section_ptr;
3255 else if (isym->st_shndx == SHN_ABS)
3256 isec = bfd_abs_section_ptr;
3257 else if (isym->st_shndx == SHN_COMMON)
3258 isec = bfd_com_section_ptr;
3259 else
3260 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3261
3262 *secpp = isec;
3263 }
3264
3265 if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
3266 input_section, data, internal_relocs,
3267 isymbuf, sections))
3268 goto error_return;
3269
3270 free (sections);
3271 if (symtab_hdr->contents != (unsigned char *) isymbuf)
3272 free (isymbuf);
3273 if (elf_section_data (input_section)->relocs != internal_relocs)
3274 free (internal_relocs);
3275 }
3276
3277 return data;
3278
3279 error_return:
3280 free (sections);
3281 if (symtab_hdr->contents != (unsigned char *) isymbuf)
3282 free (isymbuf);
3283 if (elf_section_data (input_section)->relocs != internal_relocs)
3284 free (internal_relocs);
3285 return NULL;
3286 }
3287
3288
3289 /* Determines the hash entry name for a particular reloc. It consists of
3290 the identifier of the symbol section and the added reloc addend and
3291 symbol offset relative to the section the symbol is attached to. */
3292
3293 static char *
3294 avr_stub_name (const asection *symbol_section,
3295 const bfd_vma symbol_offset,
3296 const Elf_Internal_Rela *rela)
3297 {
3298 char *stub_name;
3299 bfd_size_type len;
3300
3301 len = 8 + 1 + 8 + 1 + 1;
3302 stub_name = bfd_malloc (len);
3303 if (stub_name != NULL)
3304 sprintf (stub_name, "%08x+%08x",
3305 symbol_section->id & 0xffffffff,
3306 (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
3307
3308 return stub_name;
3309 }
3310
3311
3312 /* Add a new stub entry to the stub hash. Not all fields of the new
3313 stub entry are initialised. */
3314
3315 static struct elf32_avr_stub_hash_entry *
3316 avr_add_stub (const char *stub_name,
3317 struct elf32_avr_link_hash_table *htab)
3318 {
3319 struct elf32_avr_stub_hash_entry *hsh;
3320
3321 /* Enter this entry into the linker stub hash table. */
3322 hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);
3323
3324 if (hsh == NULL)
3325 {
3326 /* xgettext:c-format */
3327 _bfd_error_handler (_("cannot create stub entry %s"), stub_name);
3328 return NULL;
3329 }
3330
3331 hsh->stub_offset = 0;
3332 return hsh;
3333 }
3334
3335 /* We assume that there is already space allocated for the stub section
3336 contents and that before building the stubs the section size is
3337 initialized to 0. We assume that within the stub hash table entry,
3338 the absolute position of the jmp target has been written in the
3339 target_value field. We write here the offset of the generated jmp insn
3340 relative to the trampoline section start to the stub_offset entry in
3341 the stub hash table entry. */
3342
3343 static bfd_boolean
3344 avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3345 {
3346 struct elf32_avr_stub_hash_entry *hsh;
3347 struct bfd_link_info *info;
3348 struct elf32_avr_link_hash_table *htab;
3349 bfd *stub_bfd;
3350 bfd_byte *loc;
3351 bfd_vma target;
3352 bfd_vma starget;
3353
3354 /* Basic opcode */
3355 bfd_vma jmp_insn = 0x0000940c;
3356
3357 /* Massage our args to the form they really have. */
3358 hsh = avr_stub_hash_entry (bh);
3359
3360 if (!hsh->is_actually_needed)
3361 return TRUE;
3362
3363 info = (struct bfd_link_info *) in_arg;
3364
3365 htab = avr_link_hash_table (info);
3366 if (htab == NULL)
3367 return FALSE;
3368
3369 target = hsh->target_value;
3370
3371 /* Make a note of the offset within the stubs for this entry. */
3372 hsh->stub_offset = htab->stub_sec->size;
3373 loc = htab->stub_sec->contents + hsh->stub_offset;
3374
3375 stub_bfd = htab->stub_sec->owner;
3376
3377 if (debug_stubs)
3378 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
3379 (unsigned int) target,
3380 (unsigned int) hsh->stub_offset);
3381
3382 /* We now have to add the information on the jump target to the bare
3383 opcode bits already set in jmp_insn. */
3384
3385 /* Check for the alignment of the address. */
3386 if (target & 1)
3387 return FALSE;
3388
3389 starget = target >> 1;
3390 jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
3391 bfd_put_16 (stub_bfd, jmp_insn, loc);
3392 bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
3393
3394 htab->stub_sec->size += 4;
3395
3396 /* Now add the entries in the address mapping table if there is still
3397 space left. */
3398 {
3399 unsigned int nr;
3400
3401 nr = htab->amt_entry_cnt + 1;
3402 if (nr <= htab->amt_max_entry_cnt)
3403 {
3404 htab->amt_entry_cnt = nr;
3405
3406 htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
3407 htab->amt_destination_addr[nr - 1] = target;
3408 }
3409 }
3410
3411 return TRUE;
3412 }
3413
3414 static bfd_boolean
3415 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
3416 void *in_arg ATTRIBUTE_UNUSED)
3417 {
3418 struct elf32_avr_stub_hash_entry *hsh;
3419
3420 hsh = avr_stub_hash_entry (bh);
3421 hsh->is_actually_needed = FALSE;
3422
3423 return TRUE;
3424 }
3425
3426 static bfd_boolean
3427 avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
3428 {
3429 struct elf32_avr_stub_hash_entry *hsh;
3430 struct elf32_avr_link_hash_table *htab;
3431 int size;
3432
3433 /* Massage our args to the form they really have. */
3434 hsh = avr_stub_hash_entry (bh);
3435 htab = in_arg;
3436
3437 if (hsh->is_actually_needed)
3438 size = 4;
3439 else
3440 size = 0;
3441
3442 htab->stub_sec->size += size;
3443 return TRUE;
3444 }
3445
3446 void
3447 elf32_avr_setup_params (struct bfd_link_info *info,
3448 bfd *avr_stub_bfd,
3449 asection *avr_stub_section,
3450 bfd_boolean no_stubs,
3451 bfd_boolean deb_stubs,
3452 bfd_boolean deb_relax,
3453 bfd_vma pc_wrap_around,
3454 bfd_boolean call_ret_replacement)
3455 {
3456 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3457
3458 if (htab == NULL)
3459 return;
3460 htab->stub_sec = avr_stub_section;
3461 htab->stub_bfd = avr_stub_bfd;
3462 htab->no_stubs = no_stubs;
3463
3464 debug_relax = deb_relax;
3465 debug_stubs = deb_stubs;
3466 avr_pc_wrap_around = pc_wrap_around;
3467 avr_replace_call_ret_sequences = call_ret_replacement;
3468 }
3469
3470
3471 /* Set up various things so that we can make a list of input sections
3472 for each output section included in the link. Returns -1 on error,
3473 0 when no stubs will be needed, and 1 on success. It also sets
3474 information on the stubs bfd and the stub section in the info
3475 struct. */
3476
3477 int
3478 elf32_avr_setup_section_lists (bfd *output_bfd,
3479 struct bfd_link_info *info)
3480 {
3481 bfd *input_bfd;
3482 unsigned int bfd_count;
3483 unsigned int top_id, top_index;
3484 asection *section;
3485 asection **input_list, **list;
3486 size_t amt;
3487 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3488
3489 if (htab == NULL || htab->no_stubs)
3490 return 0;
3491
3492 /* Count the number of input BFDs and find the top input section id. */
3493 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3494 input_bfd != NULL;
3495 input_bfd = input_bfd->link.next)
3496 {
3497 bfd_count += 1;
3498 for (section = input_bfd->sections;
3499 section != NULL;
3500 section = section->next)
3501 if (top_id < section->id)
3502 top_id = section->id;
3503 }
3504
3505 htab->bfd_count = bfd_count;
3506
3507 /* We can't use output_bfd->section_count here to find the top output
3508 section index as some sections may have been removed, and
3509 strip_excluded_output_sections doesn't renumber the indices. */
3510 for (section = output_bfd->sections, top_index = 0;
3511 section != NULL;
3512 section = section->next)
3513 if (top_index < section->index)
3514 top_index = section->index;
3515
3516 htab->top_index = top_index;
3517 amt = sizeof (asection *) * (top_index + 1);
3518 input_list = bfd_malloc (amt);
3519 htab->input_list = input_list;
3520 if (input_list == NULL)
3521 return -1;
3522
3523 /* For sections we aren't interested in, mark their entries with a
3524 value we can check later. */
3525 list = input_list + top_index;
3526 do
3527 *list = bfd_abs_section_ptr;
3528 while (list-- != input_list);
3529
3530 for (section = output_bfd->sections;
3531 section != NULL;
3532 section = section->next)
3533 if ((section->flags & SEC_CODE) != 0)
3534 input_list[section->index] = NULL;
3535
3536 return 1;
3537 }
3538
3539
3540 /* Read in all local syms for all input bfds, and create hash entries
3541 for export stubs if we are building a multi-subspace shared lib.
3542 Returns -1 on error, 0 otherwise. */
3543
3544 static int
3545 get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
3546 {
3547 unsigned int bfd_indx;
3548 Elf_Internal_Sym *local_syms, **all_local_syms;
3549 struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
3550 size_t amt;
3551
3552 if (htab == NULL)
3553 return -1;
3554
3555 /* We want to read in symbol extension records only once. To do this
3556 we need to read in the local symbols in parallel and save them for
3557 later use; so hold pointers to the local symbols in an array. */
3558 amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3559 all_local_syms = bfd_zmalloc (amt);
3560 htab->all_local_syms = all_local_syms;
3561 if (all_local_syms == NULL)
3562 return -1;
3563
3564 /* Walk over all the input BFDs, swapping in local symbols.
3565 If we are creating a shared library, create hash entries for the
3566 export stubs. */
3567 for (bfd_indx = 0;
3568 input_bfd != NULL;
3569 input_bfd = input_bfd->link.next, bfd_indx++)
3570 {
3571 Elf_Internal_Shdr *symtab_hdr;
3572
3573 /* We'll need the symbol table in a second. */
3574 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3575 if (symtab_hdr->sh_info == 0)
3576 continue;
3577
3578 /* We need an array of the local symbols attached to the input bfd. */
3579 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3580 if (local_syms == NULL)
3581 {
3582 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3583 symtab_hdr->sh_info, 0,
3584 NULL, NULL, NULL);
3585 /* Cache them for elf_link_input_bfd. */
3586 symtab_hdr->contents = (unsigned char *) local_syms;
3587 }
3588 if (local_syms == NULL)
3589 return -1;
3590
3591 all_local_syms[bfd_indx] = local_syms;
3592 }
3593
3594 return 0;
3595 }
3596
3597 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
3598
3599 bfd_boolean
3600 elf32_avr_size_stubs (bfd *output_bfd,
3601 struct bfd_link_info *info,
3602 bfd_boolean is_prealloc_run)
3603 {
3604 struct elf32_avr_link_hash_table *htab;
3605 int stub_changed = 0;
3606
3607 htab = avr_link_hash_table (info);
3608 if (htab == NULL)
3609 return FALSE;
3610
3611 /* At this point we initialize htab->vector_base
3612 To the start of the text output section. */
3613 htab->vector_base = htab->stub_sec->output_section->vma;
3614
3615 if (get_local_syms (info->input_bfds, info))
3616 {
3617 if (htab->all_local_syms)
3618 goto error_ret_free_local;
3619 return FALSE;
3620 }
3621
3622 if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
3623 {
3624 struct elf32_avr_stub_hash_entry *test;
3625
3626 test = avr_add_stub ("Hugo",htab);
3627 test->target_value = 0x123456;
3628 test->stub_offset = 13;
3629
3630 test = avr_add_stub ("Hugo2",htab);
3631 test->target_value = 0x84210;
3632 test->stub_offset = 14;
3633 }
3634
3635 while (1)
3636 {
3637 bfd *input_bfd;
3638 unsigned int bfd_indx;
3639
3640 /* We will have to re-generate the stub hash table each time anything
3641 in memory has changed. */
3642
3643 bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
3644 for (input_bfd = info->input_bfds, bfd_indx = 0;
3645 input_bfd != NULL;
3646 input_bfd = input_bfd->link.next, bfd_indx++)
3647 {
3648 Elf_Internal_Shdr *symtab_hdr;
3649 asection *section;
3650 Elf_Internal_Sym *local_syms;
3651
3652 /* We'll need the symbol table in a second. */
3653 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3654 if (symtab_hdr->sh_info == 0)
3655 continue;
3656
3657 local_syms = htab->all_local_syms[bfd_indx];
3658
3659 /* Walk over each section attached to the input bfd. */
3660 for (section = input_bfd->sections;
3661 section != NULL;
3662 section = section->next)
3663 {
3664 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3665
3666 /* If there aren't any relocs, then there's nothing more
3667 to do. */
3668 if ((section->flags & SEC_RELOC) == 0
3669 || section->reloc_count == 0)
3670 continue;
3671
3672 /* If this section is a link-once section that will be
3673 discarded, then don't create any stubs. */
3674 if (section->output_section == NULL
3675 || section->output_section->owner != output_bfd)
3676 continue;
3677
3678 /* Get the relocs. */
3679 internal_relocs
3680 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3681 info->keep_memory);
3682 if (internal_relocs == NULL)
3683 goto error_ret_free_local;
3684
3685 /* Now examine each relocation. */
3686 irela = internal_relocs;
3687 irelaend = irela + section->reloc_count;
3688 for (; irela < irelaend; irela++)
3689 {
3690 unsigned int r_type, r_indx;
3691 struct elf32_avr_stub_hash_entry *hsh;
3692 asection *sym_sec;
3693 bfd_vma sym_value;
3694 bfd_vma destination;
3695 struct elf_link_hash_entry *hh;
3696 char *stub_name;
3697
3698 r_type = ELF32_R_TYPE (irela->r_info);
3699 r_indx = ELF32_R_SYM (irela->r_info);
3700
3701 /* Only look for 16 bit GS relocs. No other reloc will need a
3702 stub. */
3703 if (!((r_type == R_AVR_16_PM)
3704 || (r_type == R_AVR_LO8_LDI_GS)
3705 || (r_type == R_AVR_HI8_LDI_GS)))
3706 continue;
3707
3708 /* Now determine the call target, its name, value,
3709 section. */
3710 sym_sec = NULL;
3711 sym_value = 0;
3712 destination = 0;
3713 hh = NULL;
3714 if (r_indx < symtab_hdr->sh_info)
3715 {
3716 /* It's a local symbol. */
3717 Elf_Internal_Sym *sym;
3718 Elf_Internal_Shdr *hdr;
3719 unsigned int shndx;
3720
3721 sym = local_syms + r_indx;
3722 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3723 sym_value = sym->st_value;
3724 shndx = sym->st_shndx;
3725 if (shndx < elf_numsections (input_bfd))
3726 {
3727 hdr = elf_elfsections (input_bfd)[shndx];
3728 sym_sec = hdr->bfd_section;
3729 destination = (sym_value + irela->r_addend
3730 + sym_sec->output_offset
3731 + sym_sec->output_section->vma);
3732 }
3733 }
3734 else
3735 {
3736 /* It's an external symbol. */
3737 int e_indx;
3738
3739 e_indx = r_indx - symtab_hdr->sh_info;
3740 hh = elf_sym_hashes (input_bfd)[e_indx];
3741
3742 while (hh->root.type == bfd_link_hash_indirect
3743 || hh->root.type == bfd_link_hash_warning)
3744 hh = (struct elf_link_hash_entry *)
3745 (hh->root.u.i.link);
3746
3747 if (hh->root.type == bfd_link_hash_defined
3748 || hh->root.type == bfd_link_hash_defweak)
3749 {
3750 sym_sec = hh->root.u.def.section;
3751 sym_value = hh->root.u.def.value;
3752 if (sym_sec->output_section != NULL)
3753 destination = (sym_value + irela->r_addend
3754 + sym_sec->output_offset
3755 + sym_sec->output_section->vma);
3756 }
3757 else if (hh->root.type == bfd_link_hash_undefweak)
3758 {
3759 if (! bfd_link_pic (info))
3760 continue;
3761 }
3762 else if (hh->root.type == bfd_link_hash_undefined)
3763 {
3764 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3765 && (ELF_ST_VISIBILITY (hh->other)
3766 == STV_DEFAULT)))
3767 continue;
3768 }
3769 else
3770 {
3771 bfd_set_error (bfd_error_bad_value);
3772
3773 error_ret_free_internal:
3774 if (elf_section_data (section)->relocs == NULL)
3775 free (internal_relocs);
3776 goto error_ret_free_local;
3777 }
3778 }
3779
3780 if (! avr_stub_is_required_for_16_bit_reloc
3781 (destination - htab->vector_base))
3782 {
3783 if (!is_prealloc_run)
3784 /* We are having a reloc that does't need a stub. */
3785 continue;
3786
3787 /* We don't right now know if a stub will be needed.
3788 Let's rather be on the safe side. */
3789 }
3790
3791 /* Get the name of this stub. */
3792 stub_name = avr_stub_name (sym_sec, sym_value, irela);
3793
3794 if (!stub_name)
3795 goto error_ret_free_internal;
3796
3797
3798 hsh = avr_stub_hash_lookup (&htab->bstab,
3799 stub_name,
3800 FALSE, FALSE);
3801 if (hsh != NULL)
3802 {
3803 /* The proper stub has already been created. Mark it
3804 to be used and write the possibly changed destination
3805 value. */
3806 hsh->is_actually_needed = TRUE;
3807 hsh->target_value = destination;
3808 free (stub_name);
3809 continue;
3810 }
3811
3812 hsh = avr_add_stub (stub_name, htab);
3813 if (hsh == NULL)
3814 {
3815 free (stub_name);
3816 goto error_ret_free_internal;
3817 }
3818
3819 hsh->is_actually_needed = TRUE;
3820 hsh->target_value = destination;
3821
3822 if (debug_stubs)
3823 printf ("Adding stub with destination 0x%x to the"
3824 " hash table.\n", (unsigned int) destination);
3825 if (debug_stubs)
3826 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
3827
3828 stub_changed = TRUE;
3829 }
3830
3831 /* We're done with the internal relocs, free them. */
3832 if (elf_section_data (section)->relocs == NULL)
3833 free (internal_relocs);
3834 }
3835 }
3836
3837 /* Re-Calculate the number of needed stubs. */
3838 htab->stub_sec->size = 0;
3839 bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
3840
3841 if (!stub_changed)
3842 break;
3843
3844 stub_changed = FALSE;
3845 }
3846
3847 free (htab->all_local_syms);
3848 return TRUE;
3849
3850 error_ret_free_local:
3851 free (htab->all_local_syms);
3852 return FALSE;
3853 }
3854
3855
3856 /* Build all the stubs associated with the current output file. The
3857 stubs are kept in a hash table attached to the main linker hash
3858 table. We also set up the .plt entries for statically linked PIC
3859 functions here. This function is called via hppaelf_finish in the
3860 linker. */
3861
3862 bfd_boolean
3863 elf32_avr_build_stubs (struct bfd_link_info *info)
3864 {
3865 asection *stub_sec;
3866 struct bfd_hash_table *table;
3867 struct elf32_avr_link_hash_table *htab;
3868 bfd_size_type total_size = 0;
3869
3870 htab = avr_link_hash_table (info);
3871 if (htab == NULL)
3872 return FALSE;
3873
3874 /* In case that there were several stub sections: */
3875 for (stub_sec = htab->stub_bfd->sections;
3876 stub_sec != NULL;
3877 stub_sec = stub_sec->next)
3878 {
3879 bfd_size_type size;
3880
3881 /* Allocate memory to hold the linker stubs. */
3882 size = stub_sec->size;
3883 total_size += size;
3884
3885 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3886 if (stub_sec->contents == NULL && size != 0)
3887 return FALSE;
3888 stub_sec->size = 0;
3889 }
3890
3891 /* Allocate memory for the adress mapping table. */
3892 htab->amt_entry_cnt = 0;
3893 htab->amt_max_entry_cnt = total_size / 4;
3894 htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
3895 * htab->amt_max_entry_cnt);
3896 htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
3897 * htab->amt_max_entry_cnt );
3898
3899 if (debug_stubs)
3900 printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
3901
3902 /* Build the stubs as directed by the stub hash table. */
3903 table = &htab->bstab;
3904 bfd_hash_traverse (table, avr_build_one_stub, info);
3905
3906 if (debug_stubs)
3907 printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
3908
3909 return TRUE;
3910 }
3911
3912 /* Callback used by QSORT to order relocations AP and BP. */
3913
3914 static int
3915 internal_reloc_compare (const void *ap, const void *bp)
3916 {
3917 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
3918 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
3919
3920 if (a->r_offset != b->r_offset)
3921 return (a->r_offset - b->r_offset);
3922
3923 /* We don't need to sort on these criteria for correctness,
3924 but enforcing a more strict ordering prevents unstable qsort
3925 from behaving differently with different implementations.
3926 Without the code below we get correct but different results
3927 on Solaris 2.7 and 2.8. We would like to always produce the
3928 same results no matter the host. */
3929
3930 if (a->r_info != b->r_info)
3931 return (a->r_info - b->r_info);
3932
3933 return (a->r_addend - b->r_addend);
3934 }
3935
3936 /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
3937
3938 static bfd_boolean
3939 avr_is_section_for_address (asection *section, bfd_vma address)
3940 {
3941 bfd_vma vma;
3942 bfd_size_type size;
3943
3944 vma = bfd_section_vma (section);
3945 if (address < vma)
3946 return FALSE;
3947
3948 size = section->size;
3949 if (address >= vma + size)
3950 return FALSE;
3951
3952 return TRUE;
3953 }
3954
3955 /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
3956
3957 struct avr_find_section_data
3958 {
3959 /* The address we're looking for. */
3960 bfd_vma address;
3961
3962 /* The section we've found. */
3963 asection *section;
3964 };
3965
3966 /* Helper function to locate the section holding a certain virtual memory
3967 address. This is called via bfd_map_over_sections. The DATA is an
3968 instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
3969 has been set to the address to search for, and the section field has
3970 been set to NULL. If SECTION from ABFD contains ADDRESS then the
3971 section field in DATA will be set to SECTION. As an optimisation, if
3972 the section field is already non-null then this function does not
3973 perform any checks, and just returns. */
3974
3975 static void
3976 avr_find_section_for_address (bfd *abfd ATTRIBUTE_UNUSED,
3977 asection *section, void *data)
3978 {
3979 struct avr_find_section_data *fs_data
3980 = (struct avr_find_section_data *) data;
3981
3982 /* Return if already found. */
3983 if (fs_data->section != NULL)
3984 return;
3985
3986 /* If this section isn't part of the addressable code content, skip it. */
3987 if ((bfd_section_flags (section) & SEC_ALLOC) == 0
3988 && (bfd_section_flags (section) & SEC_CODE) == 0)
3989 return;
3990
3991 if (avr_is_section_for_address (section, fs_data->address))
3992 fs_data->section = section;
3993 }
3994
3995 /* Load all of the property records from SEC, a section from ABFD. Return
3996 a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
3997 memory for the returned structure, and all of the records pointed too by
3998 the structure are allocated with a single call to malloc, so, only the
3999 pointer returned needs to be free'd. */
4000
4001 static struct avr_property_record_list *
4002 avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
4003 {
4004 char *contents = NULL, *ptr;
4005 bfd_size_type size, mem_size;
4006 bfd_byte version, flags;
4007 uint16_t record_count, i;
4008 struct avr_property_record_list *r_list = NULL;
4009 Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
4010 struct avr_find_section_data fs_data;
4011
4012 fs_data.section = NULL;
4013
4014 size = bfd_section_size (sec);
4015 contents = bfd_malloc (size);
4016 bfd_get_section_contents (abfd, sec, contents, 0, size);
4017 ptr = contents;
4018
4019 /* Load the relocations for the '.avr.prop' section if there are any, and
4020 sort them. */
4021 internal_relocs = (_bfd_elf_link_read_relocs
4022 (abfd, sec, NULL, NULL, FALSE));
4023 if (internal_relocs)
4024 qsort (internal_relocs, sec->reloc_count,
4025 sizeof (Elf_Internal_Rela), internal_reloc_compare);
4026
4027 /* There is a header at the start of the property record section SEC, the
4028 format of this header is:
4029 uint8_t : version number
4030 uint8_t : flags
4031 uint16_t : record counter
4032 */
4033
4034 /* Check we have at least got a headers worth of bytes. */
4035 if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
4036 goto load_failed;
4037
4038 version = *((bfd_byte *) ptr);
4039 ptr++;
4040 flags = *((bfd_byte *) ptr);
4041 ptr++;
4042 record_count = *((uint16_t *) ptr);
4043 ptr+=2;
4044 BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
4045
4046 /* Now allocate space for the list structure, and all of the list
4047 elements in a single block. */
4048 mem_size = sizeof (struct avr_property_record_list)
4049 + sizeof (struct avr_property_record) * record_count;
4050 r_list = bfd_malloc (mem_size);
4051 if (r_list == NULL)
4052 goto load_failed;
4053
4054 r_list->version = version;
4055 r_list->flags = flags;
4056 r_list->section = sec;
4057 r_list->record_count = record_count;
4058 r_list->records = (struct avr_property_record *) (&r_list [1]);
4059 size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
4060
4061 /* Check that we understand the version number. There is only one
4062 version number right now, anything else is an error. */
4063 if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
4064 goto load_failed;
4065
4066 rel = internal_relocs;
4067 rel_end = rel + sec->reloc_count;
4068 for (i = 0; i < record_count; ++i)
4069 {
4070 bfd_vma address;
4071
4072 /* Each entry is a 32-bit address, followed by a single byte type.
4073 After that is the type specific data. We must take care to
4074 ensure that we don't read beyond the end of the section data. */
4075 if (size < 5)
4076 goto load_failed;
4077
4078 r_list->records [i].section = NULL;
4079 r_list->records [i].offset = 0;
4080
4081 if (rel)
4082 {
4083 /* The offset of the address within the .avr.prop section. */
4084 size_t offset = ptr - contents;
4085
4086 while (rel < rel_end && rel->r_offset < offset)
4087 ++rel;
4088
4089 if (rel == rel_end)
4090 rel = NULL;
4091 else if (rel->r_offset == offset)
4092 {
4093 /* Find section and section offset. */
4094 unsigned long r_symndx;
4095
4096 asection * rel_sec;
4097 bfd_vma sec_offset;
4098
4099 r_symndx = ELF32_R_SYM (rel->r_info);
4100 rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
4101 sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
4102 + rel->r_addend;
4103
4104 r_list->records [i].section = rel_sec;
4105 r_list->records [i].offset = sec_offset;
4106 }
4107 }
4108
4109 address = *((uint32_t *) ptr);
4110 ptr += 4;
4111 size -= 4;
4112
4113 if (r_list->records [i].section == NULL)
4114 {
4115 /* Try to find section and offset from address. */
4116 if (fs_data.section != NULL
4117 && !avr_is_section_for_address (fs_data.section, address))
4118 fs_data.section = NULL;
4119
4120 if (fs_data.section == NULL)
4121 {
4122 fs_data.address = address;
4123 bfd_map_over_sections (abfd, avr_find_section_for_address,
4124 &fs_data);
4125 }
4126
4127 if (fs_data.section == NULL)
4128 {
4129 fprintf (stderr, "Failed to find matching section.\n");
4130 goto load_failed;
4131 }
4132
4133 r_list->records [i].section = fs_data.section;
4134 r_list->records [i].offset
4135 = address - bfd_section_vma (fs_data.section);
4136 }
4137
4138 r_list->records [i].type = *((bfd_byte *) ptr);
4139 ptr += 1;
4140 size -= 1;
4141
4142 switch (r_list->records [i].type)
4143 {
4144 case RECORD_ORG:
4145 /* Nothing else to load. */
4146 break;
4147 case RECORD_ORG_AND_FILL:
4148 /* Just a 4-byte fill to load. */
4149 if (size < 4)
4150 goto load_failed;
4151 r_list->records [i].data.org.fill = *((uint32_t *) ptr);
4152 ptr += 4;
4153 size -= 4;
4154 break;
4155 case RECORD_ALIGN:
4156 /* Just a 4-byte alignment to load. */
4157 if (size < 4)
4158 goto load_failed;
4159 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4160 ptr += 4;
4161 size -= 4;
4162 /* Just initialise PRECEDING_DELETED field, this field is
4163 used during linker relaxation. */
4164 r_list->records [i].data.align.preceding_deleted = 0;
4165 break;
4166 case RECORD_ALIGN_AND_FILL:
4167 /* A 4-byte alignment, and a 4-byte fill to load. */
4168 if (size < 8)
4169 goto load_failed;
4170 r_list->records [i].data.align.bytes = *((uint32_t *) ptr);
4171 ptr += 4;
4172 r_list->records [i].data.align.fill = *((uint32_t *) ptr);
4173 ptr += 4;
4174 size -= 8;
4175 /* Just initialise PRECEDING_DELETED field, this field is
4176 used during linker relaxation. */
4177 r_list->records [i].data.align.preceding_deleted = 0;
4178 break;
4179 default:
4180 goto load_failed;
4181 }
4182 }
4183
4184 free (contents);
4185 if (elf_section_data (sec)->relocs != internal_relocs)
4186 free (internal_relocs);
4187 return r_list;
4188
4189 load_failed:
4190 if (elf_section_data (sec)->relocs != internal_relocs)
4191 free (internal_relocs);
4192 free (contents);
4193 free (r_list);
4194 return NULL;
4195 }
4196
4197 /* Load all of the property records from ABFD. See
4198 AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
4199
4200 struct avr_property_record_list *
4201 avr_elf32_load_property_records (bfd *abfd)
4202 {
4203 asection *sec;
4204
4205 /* Find the '.avr.prop' section and load the contents into memory. */
4206 sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
4207 if (sec == NULL)
4208 return NULL;
4209 return avr_elf32_load_records_from_section (abfd, sec);
4210 }
4211
4212 const char *
4213 avr_elf32_property_record_name (struct avr_property_record *rec)
4214 {
4215 const char *str;
4216
4217 switch (rec->type)
4218 {
4219 case RECORD_ORG:
4220 str = "ORG";
4221 break;
4222 case RECORD_ORG_AND_FILL:
4223 str = "ORG+FILL";
4224 break;
4225 case RECORD_ALIGN:
4226 str = "ALIGN";
4227 break;
4228 case RECORD_ALIGN_AND_FILL:
4229 str = "ALIGN+FILL";
4230 break;
4231 default:
4232 str = "unknown";
4233 }
4234
4235 return str;
4236 }
4237
4238
4239 #define ELF_ARCH bfd_arch_avr
4240 #define ELF_TARGET_ID AVR_ELF_DATA
4241 #define ELF_MACHINE_CODE EM_AVR
4242 #define ELF_MACHINE_ALT1 EM_AVR_OLD
4243 #define ELF_MAXPAGESIZE 1
4244
4245 #define TARGET_LITTLE_SYM avr_elf32_vec
4246 #define TARGET_LITTLE_NAME "elf32-avr"
4247
4248 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
4249
4250 #define elf_info_to_howto avr_info_to_howto_rela
4251 #define elf_info_to_howto_rel NULL
4252 #define elf_backend_relocate_section elf32_avr_relocate_section
4253 #define elf_backend_can_gc_sections 1
4254 #define elf_backend_rela_normal 1
4255 #define elf_backend_final_write_processing \
4256 bfd_elf_avr_final_write_processing
4257 #define elf_backend_object_p elf32_avr_object_p
4258
4259 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
4260 #define bfd_elf32_bfd_get_relocated_section_contents \
4261 elf32_avr_get_relocated_section_contents
4262 #define bfd_elf32_new_section_hook elf_avr_new_section_hook
4263 #define elf_backend_special_sections elf_avr_special_sections
4264
4265 #include "elf32-target.h"
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