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This commit was manufactured by cvs2svn to create branch 'gdb-
[thirdparty/binutils-gdb.git] / bfd / elf32-avr.c
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adde6300
AM		 1/* AVR-specific support for 32-bit ELF
2 Copyright (C) 1999, 2000 Free Software Foundation, Inc.
3 Contributed by Denis Chertykov <denisc@overta.ru>
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26#include "elf/avr.h"
27
28static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
29 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
30static void avr_info_to_howto_rela
31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
32static asection *elf32_avr_gc_mark_hook
33 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
34 struct elf_link_hash_entry *, Elf_Internal_Sym *));
35static boolean elf32_avr_gc_sweep_hook
36 PARAMS ((bfd *, struct bfd_link_info *, asection *,
37 const Elf_Internal_Rela *));
38static boolean elf32_avr_check_relocs
39 PARAMS ((bfd *, struct bfd_link_info *, asection *,
40 const Elf_Internal_Rela *));
41static bfd_reloc_status_type avr_final_link_relocate
42 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
43 Elf_Internal_Rela *, bfd_vma));
44static boolean elf32_avr_relocate_section
45 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
46 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
47static void bfd_elf_avr_final_write_processing PARAMS ((bfd *, boolean));
48static boolean elf32_avr_object_p PARAMS ((bfd *));
49
50
51/* Use RELA instead of REL */
52#undef USE_REL
53
54static reloc_howto_type elf_avr_howto_table[] =
55{
56 HOWTO (R_AVR_NONE, /* type */
57 0, /* rightshift */
58 2, /* size (0 = byte, 1 = short, 2 = long) */
59 32, /* bitsize */
60 false, /* pc_relative */
61 0, /* bitpos */
62 complain_overflow_bitfield, /* complain_on_overflow */
63 bfd_elf_generic_reloc, /* special_function */
64 "R_AVR_NONE", /* name */
65 false, /* partial_inplace */
66 0, /* src_mask */
67 0, /* dst_mask */
68 false), /* pcrel_offset */
69
70 HOWTO (R_AVR_32, /* type */
71 0, /* rightshift */
72 2, /* size (0 = byte, 1 = short, 2 = long) */
73 32, /* bitsize */
74 false, /* pc_relative */
75 0, /* bitpos */
76 complain_overflow_bitfield, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_AVR_32", /* name */
79 false, /* partial_inplace */
80 0xffffffff, /* src_mask */
81 0xffffffff, /* dst_mask */
82 false), /* pcrel_offset */
83
84 /* A 7 bit PC relative relocation. */
85 HOWTO (R_AVR_7_PCREL, /* type */
86 1, /* rightshift */
87 1, /* size (0 = byte, 1 = short, 2 = long) */
88 7, /* bitsize */
89 true, /* pc_relative */
90 3, /* bitpos */
91 complain_overflow_bitfield, /* complain_on_overflow */
92 bfd_elf_generic_reloc, /* special_function */
93 "R_AVR_7_PCREL", /* name */
94 false, /* partial_inplace */
95 0xffff, /* src_mask */
96 0xffff, /* dst_mask */
97 true), /* pcrel_offset */
98
99 /* A 13 bit PC relative relocation. */
100 HOWTO (R_AVR_13_PCREL, /* type */
101 1, /* rightshift */
102 1, /* size (0 = byte, 1 = short, 2 = long) */
103 13, /* bitsize */
104 true, /* pc_relative */
105 0, /* bitpos */
106 complain_overflow_bitfield, /* complain_on_overflow */
107 bfd_elf_generic_reloc, /* special_function */
108 "R_AVR_13_PCREL", /* name */
109 false, /* partial_inplace */
110 0xfff, /* src_mask */
111 0xfff, /* dst_mask */
112 true), /* pcrel_offset */
113
114 /* A 16 bit absolute relocation. */
115 HOWTO (R_AVR_16, /* type */
116 0, /* rightshift */
117 1, /* size (0 = byte, 1 = short, 2 = long) */
118 16, /* bitsize */
119 false, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_dont, /* complain_on_overflow */
122 bfd_elf_generic_reloc, /* special_function */
123 "R_AVR_16", /* name */
124 false, /* partial_inplace */
125 0xffff, /* src_mask */
126 0xffff, /* dst_mask */
127 false), /* pcrel_offset */
128
129 /* A 16 bit absolute relocation for command address. */
130 HOWTO (R_AVR_16_PM, /* type */
131 1, /* rightshift */
132 1, /* size (0 = byte, 1 = short, 2 = long) */
133 16, /* bitsize */
134 false, /* pc_relative */
135 0, /* bitpos */
136 complain_overflow_bitfield, /* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_AVR_16_PM", /* name */
139 false, /* partial_inplace */
140 0xffff, /* src_mask */
141 0xffff, /* dst_mask */
142 false), /* pcrel_offset */
143 /* A low 8 bit absolute relocation of 16 bit address.
144 For LDI command. */
145 HOWTO (R_AVR_LO8_LDI, /* type */
146 0, /* rightshift */
147 1, /* size (0 = byte, 1 = short, 2 = long) */
148 8, /* bitsize */
149 false, /* pc_relative */
150 0, /* bitpos */
151 complain_overflow_dont, /* complain_on_overflow */
152 bfd_elf_generic_reloc, /* special_function */
153 "R_AVR_LO8_LDI", /* name */
154 false, /* partial_inplace */
155 0xffff, /* src_mask */
156 0xffff, /* dst_mask */
157 false), /* pcrel_offset */
158 /* A high 8 bit absolute relocation of 16 bit address.
159 For LDI command. */
160 HOWTO (R_AVR_HI8_LDI, /* type */
161 8, /* rightshift */
162 1, /* size (0 = byte, 1 = short, 2 = long) */
163 8, /* bitsize */
164 false, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_dont, /* complain_on_overflow */
167 bfd_elf_generic_reloc, /* special_function */
168 "R_AVR_HI8_LDI", /* name */
169 false, /* partial_inplace */
170 0xffff, /* src_mask */
171 0xffff, /* dst_mask */
172 false), /* pcrel_offset */
173 /* A high 6 bit absolute relocation of 22 bit address.
174 For LDI command. */
175 HOWTO (R_AVR_HH8_LDI, /* type */
176 16, /* rightshift */
177 1, /* size (0 = byte, 1 = short, 2 = long) */
178 8, /* bitsize */
179 false, /* pc_relative */
180 0, /* bitpos */
181 complain_overflow_dont, /* complain_on_overflow */
182 bfd_elf_generic_reloc, /* special_function */
183 "R_AVR_HH8_LDI", /* name */
184 false, /* partial_inplace */
185 0xffff, /* src_mask */
186 0xffff, /* dst_mask */
187 false), /* pcrel_offset */
188 /* A negative low 8 bit absolute relocation of 16 bit address.
189 For LDI command. */
190 HOWTO (R_AVR_LO8_LDI_NEG, /* type */
191 0, /* rightshift */
192 1, /* size (0 = byte, 1 = short, 2 = long) */
193 8, /* bitsize */
194 false, /* pc_relative */
195 0, /* bitpos */
196 complain_overflow_dont, /* complain_on_overflow */
197 bfd_elf_generic_reloc, /* special_function */
198 "R_AVR_LO8_LDI_NEG", /* name */
199 false, /* partial_inplace */
200 0xffff, /* src_mask */
201 0xffff, /* dst_mask */
202 false), /* pcrel_offset */
203 /* A hegative high 8 bit absolute relocation of 16 bit address.
204 For LDI command. */
205 HOWTO (R_AVR_HI8_LDI_NEG, /* type */
206 8, /* rightshift */
207 1, /* size (0 = byte, 1 = short, 2 = long) */
208 8, /* bitsize */
209 false, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_dont, /* complain_on_overflow */
212 bfd_elf_generic_reloc, /* special_function */
213 "R_AVR_HI8_LDI_NEG", /* name */
214 false, /* partial_inplace */
215 0xffff, /* src_mask */
216 0xffff, /* dst_mask */
217 false), /* pcrel_offset */
218 /* A hegative high 6 bit absolute relocation of 22 bit address.
219 For LDI command. */
220 HOWTO (R_AVR_HH8_LDI_NEG, /* type */
221 16, /* rightshift */
222 1, /* size (0 = byte, 1 = short, 2 = long) */
223 8, /* bitsize */
224 false, /* pc_relative */
225 0, /* bitpos */
226 complain_overflow_dont, /* complain_on_overflow */
227 bfd_elf_generic_reloc, /* special_function */
228 "R_AVR_HH8_LDI_NEG", /* name */
229 false, /* partial_inplace */
230 0xffff, /* src_mask */
231 0xffff, /* dst_mask */
232 false), /* pcrel_offset */
233 /* A low 8 bit absolute relocation of 24 bit program memory address.
234 For LDI command. */
235 HOWTO (R_AVR_LO8_LDI_PM, /* type */
236 1, /* rightshift */
237 1, /* size (0 = byte, 1 = short, 2 = long) */
238 8, /* bitsize */
239 false, /* pc_relative */
240 0, /* bitpos */
241 complain_overflow_dont, /* complain_on_overflow */
242 bfd_elf_generic_reloc, /* special_function */
243 "R_AVR_LO8_LDI_PM", /* name */
244 false, /* partial_inplace */
245 0xffff, /* src_mask */
246 0xffff, /* dst_mask */
247 false), /* pcrel_offset */
248 /* A high 8 bit absolute relocation of 16 bit program memory address.
249 For LDI command. */
250 HOWTO (R_AVR_HI8_LDI_PM, /* type */
251 9, /* rightshift */
252 1, /* size (0 = byte, 1 = short, 2 = long) */
253 8, /* bitsize */
254 false, /* pc_relative */
255 0, /* bitpos */
256 complain_overflow_dont, /* complain_on_overflow */
257 bfd_elf_generic_reloc, /* special_function */
258 "R_AVR_HI8_LDI_PM", /* name */
259 false, /* partial_inplace */
260 0xffff, /* src_mask */
261 0xffff, /* dst_mask */
262 false), /* pcrel_offset */
263 /* A high 8 bit absolute relocation of 24 bit program memory address.
264 For LDI command. */
265 HOWTO (R_AVR_HH8_LDI_PM, /* type */
266 17, /* rightshift */
267 1, /* size (0 = byte, 1 = short, 2 = long) */
268 8, /* bitsize */
269 false, /* pc_relative */
270 0, /* bitpos */
271 complain_overflow_dont, /* complain_on_overflow */
272 bfd_elf_generic_reloc, /* special_function */
273 "R_AVR_HH8_LDI_PM", /* name */
274 false, /* partial_inplace */
275 0xffff, /* src_mask */
276 0xffff, /* dst_mask */
277 false), /* pcrel_offset */
278 /* A low 8 bit absolute relocation of a negative 24 bit
279 program memory address. For LDI command. */
280 HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */
281 1, /* rightshift */
282 1, /* size (0 = byte, 1 = short, 2 = long) */
283 8, /* bitsize */
284 false, /* pc_relative */
285 0, /* bitpos */
286 complain_overflow_dont, /* complain_on_overflow */
287 bfd_elf_generic_reloc, /* special_function */
288 "R_AVR_LO8_LDI_PM_NEG", /* name */
289 false, /* partial_inplace */
290 0xffff, /* src_mask */
291 0xffff, /* dst_mask */
292 false), /* pcrel_offset */
293 /* A high 8 bit absolute relocation of a negative 16 bit
294 program memory address. For LDI command. */
295 HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */
296 9, /* rightshift */
297 1, /* size (0 = byte, 1 = short, 2 = long) */
298 8, /* bitsize */
299 false, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_dont, /* complain_on_overflow */
302 bfd_elf_generic_reloc, /* special_function */
303 "R_AVR_HI8_LDI_PM_NEG", /* name */
304 false, /* partial_inplace */
305 0xffff, /* src_mask */
306 0xffff, /* dst_mask */
307 false), /* pcrel_offset */
308 /* A high 8 bit absolute relocation of a negative 24 bit
309 program memory address. For LDI command. */
310 HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */
311 17, /* rightshift */
312 1, /* size (0 = byte, 1 = short, 2 = long) */
313 8, /* bitsize */
314 false, /* pc_relative */
315 0, /* bitpos */
316 complain_overflow_dont, /* complain_on_overflow */
317 bfd_elf_generic_reloc, /* special_function */
318 "R_AVR_HH8_LDI_PM_NEG", /* name */
319 false, /* partial_inplace */
320 0xffff, /* src_mask */
321 0xffff, /* dst_mask */
322 false), /* pcrel_offset */
323 /* Relocation for CALL command in ATmega. */
324 HOWTO (R_AVR_CALL, /* type */
325 1, /* rightshift */
326 2, /* size (0 = byte, 1 = short, 2 = long) */
327 23, /* bitsize */
328 false, /* pc_relative */
329 0, /* bitpos */
330 complain_overflow_dont, /* complain_on_overflow */
331 bfd_elf_generic_reloc, /* special_function */
332 "R_AVR_CALL", /* name */
333 false, /* partial_inplace */
334 0xffffffff, /* src_mask */
335 0xffffffff, /* dst_mask */
336 false) /* pcrel_offset */
337};
338
339/* Map BFD reloc types to AVR ELF reloc types. */
340
341struct avr_reloc_map
342{
343 bfd_reloc_code_real_type bfd_reloc_val;
344 unsigned int elf_reloc_val;
345};
346
347 static const struct avr_reloc_map avr_reloc_map[] =
348{
349 { BFD_RELOC_NONE, R_AVR_NONE },
350 { BFD_RELOC_32, R_AVR_32 },
351 { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL },
352 { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL },
353 { BFD_RELOC_16, R_AVR_16 },
354 { BFD_RELOC_AVR_16_PM, R_AVR_16_PM },
355 { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI},
356 { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI },
357 { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI },
358 { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG },
359 { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG },
360 { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG },
361 { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM },
362 { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM },
363 { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM },
364 { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG },
365 { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG },
366 { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG },
367 { BFD_RELOC_AVR_CALL, R_AVR_CALL }
368};
369
370static reloc_howto_type *
371bfd_elf32_bfd_reloc_type_lookup (abfd, code)
372 bfd *abfd;
373 bfd_reloc_code_real_type code;
374{
375 unsigned int i;
376
377 for (i = 0;
378 i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
379 i++)
380 {
381 if (avr_reloc_map[i].bfd_reloc_val == code)
382 return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
383 }
384
385 return NULL;
386}
387
388/* Set the howto pointer for an AVR ELF reloc. */
389
390static void
391avr_info_to_howto_rela (abfd, cache_ptr, dst)
392 bfd *abfd;
393 arelent *cache_ptr;
394 Elf32_Internal_Rela *dst;
395{
396 unsigned int r_type;
397
398 r_type = ELF32_R_TYPE (dst->r_info);
399 BFD_ASSERT (r_type < (unsigned int) R_AVR_max);
400 cache_ptr->howto = &elf_avr_howto_table[r_type];
401}
402
403static asection *
404elf32_avr_gc_mark_hook (abfd, info, rel, h, sym)
405 bfd *abfd;
406 struct bfd_link_info *info;
407 Elf_Internal_Rela *rel;
408 struct elf_link_hash_entry *h;
409 Elf_Internal_Sym *sym;
410{
411 if (h != NULL)
412 {
413 switch (ELF32_R_TYPE (rel->r_info))
414 {
415 default:
416 switch (h->root.type)
417 {
418 case bfd_link_hash_defined:
419 case bfd_link_hash_defweak:
420 return h->root.u.def.section;
421
422 case bfd_link_hash_common:
423 return h->root.u.c.p->section;
424
425 default:
426 break;
427 }
428 }
429 }
430 else
431 {
432 if (!(elf_bad_symtab (abfd)
433 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
434 && !((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
435 && sym->st_shndx != SHN_COMMON))
436 {
437 return bfd_section_from_elf_index (abfd, sym->st_shndx);
438 }
439 }
440 return NULL;
441}
442
443static boolean
444elf32_avr_gc_sweep_hook (abfd, info, sec, relocs)
445 bfd *abfd;
446 struct bfd_link_info *info;
447 asection *sec;
448 const Elf_Internal_Rela *relocs;
449{
450 /* We don't use got and plt entries for avr. */
451 return true;
452}
453
454/* Look through the relocs for a section during the first phase.
455 Since we don't do .gots or .plts, we just need to consider the
456 virtual table relocs for gc. */
457
458static boolean
459elf32_avr_check_relocs (abfd, info, sec, relocs)
460 bfd *abfd;
461 struct bfd_link_info *info;
462 asection *sec;
463 const Elf_Internal_Rela *relocs;
464{
465 Elf_Internal_Shdr *symtab_hdr;
466 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
467 const Elf_Internal_Rela *rel;
468 const Elf_Internal_Rela *rel_end;
469
470 if (info->relocateable)
471 return true;
472
473 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
474 sym_hashes = elf_sym_hashes (abfd);
475 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
476 if (!elf_bad_symtab (abfd))
477 sym_hashes_end -= symtab_hdr->sh_info;
478
479 rel_end = relocs + sec->reloc_count;
480 for (rel = relocs; rel < rel_end; rel++)
481 {
482 struct elf_link_hash_entry *h;
483 unsigned long r_symndx;
484
485 r_symndx = ELF32_R_SYM (rel->r_info);
486 if (r_symndx < symtab_hdr->sh_info)
487 h = NULL;
488 else
489 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
490 }
491
492 return true;
493}
494
495/* Perform a single relocation. By default we use the standard BFD
496 routines, but a few relocs, we have to do them ourselves. */
497
498static bfd_reloc_status_type
499avr_final_link_relocate (howto, input_bfd, input_section,
500 contents, rel, relocation)
501 reloc_howto_type * howto;
502 bfd * input_bfd;
503 asection * input_section;
504 bfd_byte * contents;
505 Elf_Internal_Rela * rel;
506 bfd_vma relocation;
507{
508 bfd_reloc_status_type r = bfd_reloc_ok;
509 bfd_vma x;
510 bfd_signed_vma srel;
511
512 switch (howto->type)
513 {
514 case R_AVR_7_PCREL:
515 contents += rel->r_offset;
516 srel = (bfd_signed_vma) relocation;
517 srel += rel->r_addend;
518 srel -= rel->r_offset;
519 srel -= 2; /* Branch instructions add 2 to the PC... */
520 srel -= (input_section->output_section->vma +
521 input_section->output_offset);
522
523 if (srel & 1)
524 return bfd_reloc_outofrange;
525 if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
526 return bfd_reloc_overflow;
527 x = bfd_get_16 (input_bfd, contents);
528 x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
529 bfd_put_16 (input_bfd, x, contents);
530 break;
531
532 case R_AVR_13_PCREL:
533 contents += rel->r_offset;
534 srel = (bfd_signed_vma) relocation;
535 srel += rel->r_addend;
536 srel -= rel->r_offset;
537 srel -= 2; /* Branch instructions add 2 to the PC... */
538 srel -= (input_section->output_section->vma +
539 input_section->output_offset);
540
541 if (srel & 1)
542 return bfd_reloc_outofrange;
543
544 /* AVR addresses commands as words. */
545 srel >>= 1;
546
547 /* Check for overflow. */
548 if (srel < -2048 || srel > 2047)
549 {
550 /* Apply WRAPAROUND if possible. */
551 if (bfd_get_mach (input_bfd) == bfd_mach_avr2)
552 {
553 if (srel > 2047)
554 srel -= 4096;
555 else
556 srel += 4096;
557 }
558 else
559 return bfd_reloc_overflow;
560 }
561
562 x = bfd_get_16 (input_bfd, contents);
563 x = (x & 0xf000) | (srel & 0xfff);
564 bfd_put_16 (input_bfd, x, contents);
565 break;
566
567 case R_AVR_LO8_LDI:
568 contents += rel->r_offset;
569 srel = (bfd_signed_vma) relocation + rel->r_addend;
570 x = bfd_get_16 (input_bfd, contents);
571 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
572 bfd_put_16 (input_bfd, x, contents);
573 break;
574
575 case R_AVR_HI8_LDI:
576 contents += rel->r_offset;
577 srel = (bfd_signed_vma) relocation + rel->r_addend;
578 srel = (srel >> 8) & 0xff;
579 x = bfd_get_16 (input_bfd, contents);
580 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
581 bfd_put_16 (input_bfd, x, contents);
582 break;
583
584 case R_AVR_HH8_LDI:
585 contents += rel->r_offset;
586 srel = (bfd_signed_vma) relocation + rel->r_addend;
587 srel = (srel >> 16) & 0xff;
588 x = bfd_get_16 (input_bfd, contents);
589 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
590 bfd_put_16 (input_bfd, x, contents);
591 break;
592
593 case R_AVR_LO8_LDI_NEG:
594 contents += rel->r_offset;
595 srel = (bfd_signed_vma) relocation + rel->r_addend;
596 srel = -srel;
597 x = bfd_get_16 (input_bfd, contents);
598 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
599 bfd_put_16 (input_bfd, x, contents);
600 break;
601
602 case R_AVR_HI8_LDI_NEG:
603 contents += rel->r_offset;
604 srel = (bfd_signed_vma) relocation + rel->r_addend;
605 srel = -srel;
606 srel = (srel >> 8) & 0xff;
607 x = bfd_get_16 (input_bfd, contents);
608 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
609 bfd_put_16 (input_bfd, x, contents);
610 break;
611
612 case R_AVR_HH8_LDI_NEG:
613 contents += rel->r_offset;
614 srel = (bfd_signed_vma) relocation + rel->r_addend;
615 srel = -srel;
616 srel = (srel >> 16) & 0xff;
617 x = bfd_get_16 (input_bfd, contents);
618 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
619 bfd_put_16 (input_bfd, x, contents);
620 break;
621
622 case R_AVR_LO8_LDI_PM:
623 contents += rel->r_offset;
624 srel = (bfd_signed_vma) relocation + rel->r_addend;
625 if (srel & 1)
626 return bfd_reloc_outofrange;
627 srel = srel >> 1;
628 x = bfd_get_16 (input_bfd, contents);
629 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
630 bfd_put_16 (input_bfd, x, contents);
631 break;
632
633 case R_AVR_HI8_LDI_PM:
634 contents += rel->r_offset;
635 srel = (bfd_signed_vma) relocation + rel->r_addend;
636 if (srel & 1)
637 return bfd_reloc_outofrange;
638 srel = srel >> 1;
639 srel = (srel >> 8) & 0xff;
640 x = bfd_get_16 (input_bfd, contents);
641 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
642 bfd_put_16 (input_bfd, x, contents);
643 break;
644
645 case R_AVR_HH8_LDI_PM:
646 contents += rel->r_offset;
647 srel = (bfd_signed_vma) relocation + rel->r_addend;
648 if (srel & 1)
649 return bfd_reloc_outofrange;
650 srel = srel >> 1;
651 srel = (srel >> 16) & 0xff;
652 x = bfd_get_16 (input_bfd, contents);
653 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
654 bfd_put_16 (input_bfd, x, contents);
655 break;
656
657 case R_AVR_LO8_LDI_PM_NEG:
658 contents += rel->r_offset;
659 srel = (bfd_signed_vma) relocation + rel->r_addend;
660 srel = -srel;
661 if (srel & 1)
662 return bfd_reloc_outofrange;
663 srel = srel >> 1;
664 x = bfd_get_16 (input_bfd, contents);
665 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
666 bfd_put_16 (input_bfd, x, contents);
667 break;
668
669 case R_AVR_HI8_LDI_PM_NEG:
670 contents += rel->r_offset;
671 srel = (bfd_signed_vma) relocation + rel->r_addend;
672 srel = -srel;
673 if (srel & 1)
674 return bfd_reloc_outofrange;
675 srel = srel >> 1;
676 srel = (srel >> 8) & 0xff;
677 x = bfd_get_16 (input_bfd, contents);
678 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
679 bfd_put_16 (input_bfd, x, contents);
680 break;
681
682 case R_AVR_HH8_LDI_PM_NEG:
683 contents += rel->r_offset;
684 srel = (bfd_signed_vma) relocation + rel->r_addend;
685 srel = -srel;
686 if (srel & 1)
687 return bfd_reloc_outofrange;
688 srel = srel >> 1;
689 srel = (srel >> 16) & 0xff;
690 x = bfd_get_16 (input_bfd, contents);
691 x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
692 bfd_put_16 (input_bfd, x, contents);
693 break;
694
695 case R_AVR_CALL:
696 contents += rel->r_offset;
697 srel = (bfd_signed_vma) relocation + rel->r_addend;
698 if (srel & 1)
699 return bfd_reloc_outofrange;
700 srel = srel >> 1;
701 x = bfd_get_16 (input_bfd, contents);
702 x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
703 bfd_put_16 (input_bfd, x, contents);
704 bfd_put_16 (input_bfd, srel & 0xffff, contents+2);
705 break;
706
707 default:
708 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
709 contents, rel->r_offset,
710 relocation, rel->r_addend);
711 }
712
713 return r;
714}
715
716/* Relocate an AVR ELF section. */
717static boolean
718elf32_avr_relocate_section (output_bfd, info, input_bfd, input_section,
719 contents, relocs, local_syms, local_sections)
720 bfd *output_bfd;
721 struct bfd_link_info *info;
722 bfd *input_bfd;
723 asection *input_section;
724 bfd_byte *contents;
725 Elf_Internal_Rela *relocs;
726 Elf_Internal_Sym *local_syms;
727 asection **local_sections;
728{
729 Elf_Internal_Shdr * symtab_hdr;
730 struct elf_link_hash_entry ** sym_hashes;
731 Elf_Internal_Rela * rel;
732 Elf_Internal_Rela * relend;
733
734 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
735 sym_hashes = elf_sym_hashes (input_bfd);
736 relend = relocs + input_section->reloc_count;
737
738 for (rel = relocs; rel < relend; rel ++)
739 {
740 reloc_howto_type * howto;
741 unsigned long r_symndx;
742 Elf_Internal_Sym * sym;
743 asection * sec;
744 struct elf_link_hash_entry * h;
745 bfd_vma relocation;
746 bfd_reloc_status_type r;
747 const char * name = NULL;
748 int r_type;
749
750 r_type = ELF32_R_TYPE (rel->r_info);
751 r_symndx = ELF32_R_SYM (rel->r_info);
752
753 if (info->relocateable)
754 {
755 /* This is a relocateable link. We don't have to change
756 anything, unless the reloc is against a section symbol,
757 in which case we have to adjust according to where the
758 section symbol winds up in the output section. */
759 if (r_symndx < symtab_hdr->sh_info)
760 {
761 sym = local_syms + r_symndx;
762
763 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
764 {
765 sec = local_sections [r_symndx];
766 rel->r_addend += sec->output_offset + sym->st_value;
767 }
768 }
769
770 continue;
771 }
772
773 /* This is a final link. */
774 howto = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info);
775 h = NULL;
776 sym = NULL;
777 sec = NULL;
778
779 if (r_symndx < symtab_hdr->sh_info)
780 {
781 sym = local_syms + r_symndx;
782 sec = local_sections [r_symndx];
783 relocation = (sec->output_section->vma
784 + sec->output_offset
785 + sym->st_value);
786
787 name = bfd_elf_string_from_elf_section
788 (input_bfd, symtab_hdr->sh_link, sym->st_name);
789 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
790 }
791 else
792 {
793 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
794
795 while (h->root.type == bfd_link_hash_indirect
796 || h->root.type == bfd_link_hash_warning)
797 h = (struct elf_link_hash_entry *) h->root.u.i.link;
798
799 name = h->root.root.string;
800
801 if (h->root.type == bfd_link_hash_defined
802 || h->root.type == bfd_link_hash_defweak)
803 {
804 sec = h->root.u.def.section;
805 relocation = (h->root.u.def.value
806 + sec->output_section->vma
807 + sec->output_offset);
808 }
809 else if (h->root.type == bfd_link_hash_undefweak)
810 {
811 relocation = 0;
812 }
813 else
814 {
815 if (! ((*info->callbacks->undefined_symbol)
816 (info, h->root.root.string, input_bfd,
817 input_section, rel->r_offset, true)))
818 return false;
819 relocation = 0;
820 }
821 }
822
823 r = avr_final_link_relocate (howto, input_bfd, input_section,
824 contents, rel, relocation);
825
826 if (r != bfd_reloc_ok)
827 {
828 const char * msg = (const char *) NULL;
829
830 switch (r)
831 {
832 case bfd_reloc_overflow:
833 r = info->callbacks->reloc_overflow
834 (info, name, howto->name, (bfd_vma) 0,
835 input_bfd, input_section, rel->r_offset);
836 break;
837
838 case bfd_reloc_undefined:
839 r = info->callbacks->undefined_symbol
840 (info, name, input_bfd, input_section, rel->r_offset, true);
841 break;
842
843 case bfd_reloc_outofrange:
844 msg = _("internal error: out of range error");
845 break;
846
847 case bfd_reloc_notsupported:
848 msg = _("internal error: unsupported relocation error");
849 break;
850
851 case bfd_reloc_dangerous:
852 msg = _("internal error: dangerous relocation");
853 break;
854
855 default:
856 msg = _("internal error: unknown error");
857 break;
858 }
859
860 if (msg)
861 r = info->callbacks->warning
862 (info, msg, name, input_bfd, input_section, rel->r_offset);
863
864 if (! r)
865 return false;
866 }
867 }
868
869 return true;
870}
871
872/* The final processing done just before writing out a AVR ELF object
873 file. This gets the AVR architecture right based on the machine
874 number. */
875
876static void
877bfd_elf_avr_final_write_processing (abfd, linker)
878 bfd *abfd;
879 boolean linker ATTRIBUTE_UNUSED;
880{
881 unsigned long val;
882
883 switch (bfd_get_mach (abfd))
884 {
885 default:
886 case bfd_mach_avr2:
887 val = E_AVR_MACH_AVR2;
888 break;
889
890 case bfd_mach_avr1:
891 val = E_AVR_MACH_AVR1;
892 break;
893
894 case bfd_mach_avr3:
895 val = E_AVR_MACH_AVR3;
896 break;
897
898 case bfd_mach_avr4:
899 val = E_AVR_MACH_AVR4;
900 break;
901
902 }
903
904 elf_elfheader (abfd)->e_machine = EM_AVR;
905 elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
906 elf_elfheader (abfd)->e_flags |= val;
907}
908
909/* Set the right machine number. */
910
911static boolean
912elf32_avr_object_p (abfd)
913 bfd *abfd;
914{
915 int e_set = bfd_mach_avr2;
916 if (elf_elfheader (abfd)->e_machine == EM_AVR)
917 {
918 int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
919 switch (e_mach)
920 {
921 default:
922 case E_AVR_MACH_AVR2:
923 e_set = bfd_mach_avr2;
924 break;
925
926 case E_AVR_MACH_AVR1:
927 e_set = bfd_mach_avr1;
928 break;
929
930 case E_AVR_MACH_AVR3:
931 e_set = bfd_mach_avr3;
932 break;
933
934 case E_AVR_MACH_AVR4:
935 e_set = bfd_mach_avr4;
936 break;
937 }
938 }
939 return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
940 e_set);
941}
942
943
944#define ELF_ARCH bfd_arch_avr
945#define ELF_MACHINE_CODE EM_AVR
946#define ELF_MAXPAGESIZE 1
947
948#define TARGET_LITTLE_SYM bfd_elf32_avr_vec
949#define TARGET_LITTLE_NAME "elf32-avr"
950
951#define elf_info_to_howto avr_info_to_howto_rela
952#define elf_info_to_howto_rel NULL
953#define elf_backend_relocate_section elf32_avr_relocate_section
954#define elf_backend_gc_mark_hook elf32_avr_gc_mark_hook
955#define elf_backend_gc_sweep_hook elf32_avr_gc_sweep_hook
956#define elf_backend_check_relocs elf32_avr_check_relocs
957#define elf_backend_can_gc_sections 1
958#define elf_backend_final_write_processing \
959 bfd_elf_avr_final_write_processing
960#define elf_backend_object_p elf32_avr_object_p
961
962
963#include "elf32-target.h"
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