1 /* AVR-specific support for 32-bit ELF
2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Denis Chertykov <denisc@overta.ru>
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor,
21 Boston, MA 02110-1301, USA. */
28 #include "elf32-avr.h"
30 /* Enable debugging printout at stdout with this variable. */
31 static bfd_boolean debug_relax
= FALSE
;
33 /* Enable debugging printout at stdout with this variable. */
34 static bfd_boolean debug_stubs
= FALSE
;
36 /* Hash table initialization and handling. Code is taken from the hppa port
37 and adapted to the needs of AVR. */
39 /* We use two hash tables to hold information for linking avr objects.
41 The first is the elf32_avr_link_hash_table which is derived from the
42 stanard ELF linker hash table. We use this as a place to attach the other
43 hash table and some static information.
45 The second is the stub hash table which is derived from the base BFD
46 hash table. The stub hash table holds the information on the linker
49 struct elf32_avr_stub_hash_entry
51 /* Base hash table entry structure. */
52 struct bfd_hash_entry bh_root
;
54 /* Offset within stub_sec of the beginning of this stub. */
57 /* Given the symbol's value and its section we can determine its final
58 value when building the stubs (so the stub knows where to jump). */
61 /* This way we could mark stubs to be no longer necessary. */
62 bfd_boolean is_actually_needed
;
65 struct elf32_avr_link_hash_table
67 /* The main hash table. */
68 struct elf_link_hash_table etab
;
70 /* The stub hash table. */
71 struct bfd_hash_table bstab
;
75 /* Linker stub bfd. */
78 /* The stub section. */
81 /* Usually 0, unless we are generating code for a bootloader. Will
82 be initialized by elf32_avr_size_stubs to the vma offset of the
83 output section associated with the stub section. */
86 /* Assorted information used by elf32_avr_size_stubs. */
87 unsigned int bfd_count
;
89 asection
** input_list
;
90 Elf_Internal_Sym
** all_local_syms
;
92 /* Tables for mapping vma beyond the 128k boundary to the address of the
93 corresponding stub. (AMT)
94 "amt_max_entry_cnt" reflects the number of entries that memory is allocated
95 for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
96 "amt_entry_cnt" informs how many of these entries actually contain
98 unsigned int amt_entry_cnt
;
99 unsigned int amt_max_entry_cnt
;
100 bfd_vma
* amt_stub_offsets
;
101 bfd_vma
* amt_destination_addr
;
104 /* Various hash macros and functions. */
105 #define avr_link_hash_table(p) \
106 /* PR 3874: Check that we have an AVR style hash table before using it. */\
107 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
108 == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL)
110 #define avr_stub_hash_entry(ent) \
111 ((struct elf32_avr_stub_hash_entry *)(ent))
113 #define avr_stub_hash_lookup(table, string, create, copy) \
114 ((struct elf32_avr_stub_hash_entry *) \
115 bfd_hash_lookup ((table), (string), (create), (copy)))
117 static reloc_howto_type elf_avr_howto_table
[] =
119 HOWTO (R_AVR_NONE
, /* type */
121 2, /* size (0 = byte, 1 = short, 2 = long) */
123 FALSE
, /* pc_relative */
125 complain_overflow_bitfield
, /* complain_on_overflow */
126 bfd_elf_generic_reloc
, /* special_function */
127 "R_AVR_NONE", /* name */
128 FALSE
, /* partial_inplace */
131 FALSE
), /* pcrel_offset */
133 HOWTO (R_AVR_32
, /* type */
135 2, /* size (0 = byte, 1 = short, 2 = long) */
137 FALSE
, /* pc_relative */
139 complain_overflow_bitfield
, /* complain_on_overflow */
140 bfd_elf_generic_reloc
, /* special_function */
141 "R_AVR_32", /* name */
142 FALSE
, /* partial_inplace */
143 0xffffffff, /* src_mask */
144 0xffffffff, /* dst_mask */
145 FALSE
), /* pcrel_offset */
147 /* A 7 bit PC relative relocation. */
148 HOWTO (R_AVR_7_PCREL
, /* type */
150 1, /* size (0 = byte, 1 = short, 2 = long) */
152 TRUE
, /* pc_relative */
154 complain_overflow_bitfield
, /* complain_on_overflow */
155 bfd_elf_generic_reloc
, /* special_function */
156 "R_AVR_7_PCREL", /* name */
157 FALSE
, /* partial_inplace */
158 0xffff, /* src_mask */
159 0xffff, /* dst_mask */
160 TRUE
), /* pcrel_offset */
162 /* A 13 bit PC relative relocation. */
163 HOWTO (R_AVR_13_PCREL
, /* type */
165 1, /* size (0 = byte, 1 = short, 2 = long) */
167 TRUE
, /* pc_relative */
169 complain_overflow_bitfield
, /* complain_on_overflow */
170 bfd_elf_generic_reloc
, /* special_function */
171 "R_AVR_13_PCREL", /* name */
172 FALSE
, /* partial_inplace */
173 0xfff, /* src_mask */
174 0xfff, /* dst_mask */
175 TRUE
), /* pcrel_offset */
177 /* A 16 bit absolute relocation. */
178 HOWTO (R_AVR_16
, /* type */
180 1, /* size (0 = byte, 1 = short, 2 = long) */
182 FALSE
, /* pc_relative */
184 complain_overflow_dont
, /* complain_on_overflow */
185 bfd_elf_generic_reloc
, /* special_function */
186 "R_AVR_16", /* name */
187 FALSE
, /* partial_inplace */
188 0xffff, /* src_mask */
189 0xffff, /* dst_mask */
190 FALSE
), /* pcrel_offset */
192 /* A 16 bit absolute relocation for command address
193 Will be changed when linker stubs are needed. */
194 HOWTO (R_AVR_16_PM
, /* type */
196 1, /* size (0 = byte, 1 = short, 2 = long) */
198 FALSE
, /* pc_relative */
200 complain_overflow_bitfield
, /* complain_on_overflow */
201 bfd_elf_generic_reloc
, /* special_function */
202 "R_AVR_16_PM", /* name */
203 FALSE
, /* partial_inplace */
204 0xffff, /* src_mask */
205 0xffff, /* dst_mask */
206 FALSE
), /* pcrel_offset */
207 /* A low 8 bit absolute relocation of 16 bit address.
209 HOWTO (R_AVR_LO8_LDI
, /* type */
211 1, /* size (0 = byte, 1 = short, 2 = long) */
213 FALSE
, /* pc_relative */
215 complain_overflow_dont
, /* complain_on_overflow */
216 bfd_elf_generic_reloc
, /* special_function */
217 "R_AVR_LO8_LDI", /* name */
218 FALSE
, /* partial_inplace */
219 0xffff, /* src_mask */
220 0xffff, /* dst_mask */
221 FALSE
), /* pcrel_offset */
222 /* A high 8 bit absolute relocation of 16 bit address.
224 HOWTO (R_AVR_HI8_LDI
, /* type */
226 1, /* size (0 = byte, 1 = short, 2 = long) */
228 FALSE
, /* pc_relative */
230 complain_overflow_dont
, /* complain_on_overflow */
231 bfd_elf_generic_reloc
, /* special_function */
232 "R_AVR_HI8_LDI", /* name */
233 FALSE
, /* partial_inplace */
234 0xffff, /* src_mask */
235 0xffff, /* dst_mask */
236 FALSE
), /* pcrel_offset */
237 /* A high 6 bit absolute relocation of 22 bit address.
238 For LDI command. As well second most significant 8 bit value of
239 a 32 bit link-time constant. */
240 HOWTO (R_AVR_HH8_LDI
, /* type */
242 1, /* size (0 = byte, 1 = short, 2 = long) */
244 FALSE
, /* pc_relative */
246 complain_overflow_dont
, /* complain_on_overflow */
247 bfd_elf_generic_reloc
, /* special_function */
248 "R_AVR_HH8_LDI", /* name */
249 FALSE
, /* partial_inplace */
250 0xffff, /* src_mask */
251 0xffff, /* dst_mask */
252 FALSE
), /* pcrel_offset */
253 /* A negative low 8 bit absolute relocation of 16 bit address.
255 HOWTO (R_AVR_LO8_LDI_NEG
, /* type */
257 1, /* size (0 = byte, 1 = short, 2 = long) */
259 FALSE
, /* pc_relative */
261 complain_overflow_dont
, /* complain_on_overflow */
262 bfd_elf_generic_reloc
, /* special_function */
263 "R_AVR_LO8_LDI_NEG", /* name */
264 FALSE
, /* partial_inplace */
265 0xffff, /* src_mask */
266 0xffff, /* dst_mask */
267 FALSE
), /* pcrel_offset */
268 /* A negative high 8 bit absolute relocation of 16 bit address.
270 HOWTO (R_AVR_HI8_LDI_NEG
, /* type */
272 1, /* size (0 = byte, 1 = short, 2 = long) */
274 FALSE
, /* pc_relative */
276 complain_overflow_dont
, /* complain_on_overflow */
277 bfd_elf_generic_reloc
, /* special_function */
278 "R_AVR_HI8_LDI_NEG", /* name */
279 FALSE
, /* partial_inplace */
280 0xffff, /* src_mask */
281 0xffff, /* dst_mask */
282 FALSE
), /* pcrel_offset */
283 /* A negative high 6 bit absolute relocation of 22 bit address.
285 HOWTO (R_AVR_HH8_LDI_NEG
, /* type */
287 1, /* size (0 = byte, 1 = short, 2 = long) */
289 FALSE
, /* pc_relative */
291 complain_overflow_dont
, /* complain_on_overflow */
292 bfd_elf_generic_reloc
, /* special_function */
293 "R_AVR_HH8_LDI_NEG", /* name */
294 FALSE
, /* partial_inplace */
295 0xffff, /* src_mask */
296 0xffff, /* dst_mask */
297 FALSE
), /* pcrel_offset */
298 /* A low 8 bit absolute relocation of 24 bit program memory address.
299 For LDI command. Will not be changed when linker stubs are needed. */
300 HOWTO (R_AVR_LO8_LDI_PM
, /* type */
302 1, /* size (0 = byte, 1 = short, 2 = long) */
304 FALSE
, /* pc_relative */
306 complain_overflow_dont
, /* complain_on_overflow */
307 bfd_elf_generic_reloc
, /* special_function */
308 "R_AVR_LO8_LDI_PM", /* name */
309 FALSE
, /* partial_inplace */
310 0xffff, /* src_mask */
311 0xffff, /* dst_mask */
312 FALSE
), /* pcrel_offset */
313 /* A low 8 bit absolute relocation of 24 bit program memory address.
314 For LDI command. Will not be changed when linker stubs are needed. */
315 HOWTO (R_AVR_HI8_LDI_PM
, /* type */
317 1, /* size (0 = byte, 1 = short, 2 = long) */
319 FALSE
, /* pc_relative */
321 complain_overflow_dont
, /* complain_on_overflow */
322 bfd_elf_generic_reloc
, /* special_function */
323 "R_AVR_HI8_LDI_PM", /* name */
324 FALSE
, /* partial_inplace */
325 0xffff, /* src_mask */
326 0xffff, /* dst_mask */
327 FALSE
), /* pcrel_offset */
328 /* A low 8 bit absolute relocation of 24 bit program memory address.
329 For LDI command. Will not be changed when linker stubs are needed. */
330 HOWTO (R_AVR_HH8_LDI_PM
, /* type */
332 1, /* size (0 = byte, 1 = short, 2 = long) */
334 FALSE
, /* pc_relative */
336 complain_overflow_dont
, /* complain_on_overflow */
337 bfd_elf_generic_reloc
, /* special_function */
338 "R_AVR_HH8_LDI_PM", /* name */
339 FALSE
, /* partial_inplace */
340 0xffff, /* src_mask */
341 0xffff, /* dst_mask */
342 FALSE
), /* pcrel_offset */
343 /* A low 8 bit absolute relocation of 24 bit program memory address.
344 For LDI command. Will not be changed when linker stubs are needed. */
345 HOWTO (R_AVR_LO8_LDI_PM_NEG
, /* type */
347 1, /* size (0 = byte, 1 = short, 2 = long) */
349 FALSE
, /* pc_relative */
351 complain_overflow_dont
, /* complain_on_overflow */
352 bfd_elf_generic_reloc
, /* special_function */
353 "R_AVR_LO8_LDI_PM_NEG", /* name */
354 FALSE
, /* partial_inplace */
355 0xffff, /* src_mask */
356 0xffff, /* dst_mask */
357 FALSE
), /* pcrel_offset */
358 /* A low 8 bit absolute relocation of 24 bit program memory address.
359 For LDI command. Will not be changed when linker stubs are needed. */
360 HOWTO (R_AVR_HI8_LDI_PM_NEG
, /* type */
362 1, /* size (0 = byte, 1 = short, 2 = long) */
364 FALSE
, /* pc_relative */
366 complain_overflow_dont
, /* complain_on_overflow */
367 bfd_elf_generic_reloc
, /* special_function */
368 "R_AVR_HI8_LDI_PM_NEG", /* name */
369 FALSE
, /* partial_inplace */
370 0xffff, /* src_mask */
371 0xffff, /* dst_mask */
372 FALSE
), /* pcrel_offset */
373 /* A low 8 bit absolute relocation of 24 bit program memory address.
374 For LDI command. Will not be changed when linker stubs are needed. */
375 HOWTO (R_AVR_HH8_LDI_PM_NEG
, /* type */
377 1, /* size (0 = byte, 1 = short, 2 = long) */
379 FALSE
, /* pc_relative */
381 complain_overflow_dont
, /* complain_on_overflow */
382 bfd_elf_generic_reloc
, /* special_function */
383 "R_AVR_HH8_LDI_PM_NEG", /* name */
384 FALSE
, /* partial_inplace */
385 0xffff, /* src_mask */
386 0xffff, /* dst_mask */
387 FALSE
), /* pcrel_offset */
388 /* Relocation for CALL command in ATmega. */
389 HOWTO (R_AVR_CALL
, /* type */
391 2, /* size (0 = byte, 1 = short, 2 = long) */
393 FALSE
, /* pc_relative */
395 complain_overflow_dont
,/* complain_on_overflow */
396 bfd_elf_generic_reloc
, /* special_function */
397 "R_AVR_CALL", /* name */
398 FALSE
, /* partial_inplace */
399 0xffffffff, /* src_mask */
400 0xffffffff, /* dst_mask */
401 FALSE
), /* pcrel_offset */
402 /* A 16 bit absolute relocation of 16 bit address.
404 HOWTO (R_AVR_LDI
, /* type */
406 1, /* size (0 = byte, 1 = short, 2 = long) */
408 FALSE
, /* pc_relative */
410 complain_overflow_dont
,/* complain_on_overflow */
411 bfd_elf_generic_reloc
, /* special_function */
412 "R_AVR_LDI", /* name */
413 FALSE
, /* partial_inplace */
414 0xffff, /* src_mask */
415 0xffff, /* dst_mask */
416 FALSE
), /* pcrel_offset */
417 /* A 6 bit absolute relocation of 6 bit offset.
418 For ldd/sdd command. */
419 HOWTO (R_AVR_6
, /* type */
421 0, /* size (0 = byte, 1 = short, 2 = long) */
423 FALSE
, /* pc_relative */
425 complain_overflow_dont
,/* complain_on_overflow */
426 bfd_elf_generic_reloc
, /* special_function */
427 "R_AVR_6", /* name */
428 FALSE
, /* partial_inplace */
429 0xffff, /* src_mask */
430 0xffff, /* dst_mask */
431 FALSE
), /* pcrel_offset */
432 /* A 6 bit absolute relocation of 6 bit offset.
433 For sbiw/adiw command. */
434 HOWTO (R_AVR_6_ADIW
, /* type */
436 0, /* size (0 = byte, 1 = short, 2 = long) */
438 FALSE
, /* pc_relative */
440 complain_overflow_dont
,/* complain_on_overflow */
441 bfd_elf_generic_reloc
, /* special_function */
442 "R_AVR_6_ADIW", /* name */
443 FALSE
, /* partial_inplace */
444 0xffff, /* src_mask */
445 0xffff, /* dst_mask */
446 FALSE
), /* pcrel_offset */
447 /* Most significant 8 bit value of a 32 bit link-time constant. */
448 HOWTO (R_AVR_MS8_LDI
, /* type */
450 1, /* size (0 = byte, 1 = short, 2 = long) */
452 FALSE
, /* pc_relative */
454 complain_overflow_dont
, /* complain_on_overflow */
455 bfd_elf_generic_reloc
, /* special_function */
456 "R_AVR_MS8_LDI", /* name */
457 FALSE
, /* partial_inplace */
458 0xffff, /* src_mask */
459 0xffff, /* dst_mask */
460 FALSE
), /* pcrel_offset */
461 /* Negative most significant 8 bit value of a 32 bit link-time constant. */
462 HOWTO (R_AVR_MS8_LDI_NEG
, /* type */
464 1, /* size (0 = byte, 1 = short, 2 = long) */
466 FALSE
, /* pc_relative */
468 complain_overflow_dont
, /* complain_on_overflow */
469 bfd_elf_generic_reloc
, /* special_function */
470 "R_AVR_MS8_LDI_NEG", /* name */
471 FALSE
, /* partial_inplace */
472 0xffff, /* src_mask */
473 0xffff, /* dst_mask */
474 FALSE
), /* pcrel_offset */
475 /* A low 8 bit absolute relocation of 24 bit program memory address.
476 For LDI command. Will be changed when linker stubs are needed. */
477 HOWTO (R_AVR_LO8_LDI_GS
, /* type */
479 1, /* size (0 = byte, 1 = short, 2 = long) */
481 FALSE
, /* pc_relative */
483 complain_overflow_dont
, /* complain_on_overflow */
484 bfd_elf_generic_reloc
, /* special_function */
485 "R_AVR_LO8_LDI_GS", /* name */
486 FALSE
, /* partial_inplace */
487 0xffff, /* src_mask */
488 0xffff, /* dst_mask */
489 FALSE
), /* pcrel_offset */
490 /* A low 8 bit absolute relocation of 24 bit program memory address.
491 For LDI command. Will be changed when linker stubs are needed. */
492 HOWTO (R_AVR_HI8_LDI_GS
, /* type */
494 1, /* size (0 = byte, 1 = short, 2 = long) */
496 FALSE
, /* pc_relative */
498 complain_overflow_dont
, /* complain_on_overflow */
499 bfd_elf_generic_reloc
, /* special_function */
500 "R_AVR_HI8_LDI_GS", /* name */
501 FALSE
, /* partial_inplace */
502 0xffff, /* src_mask */
503 0xffff, /* dst_mask */
504 FALSE
), /* pcrel_offset */
506 HOWTO (R_AVR_8
, /* type */
508 0, /* size (0 = byte, 1 = short, 2 = long) */
510 FALSE
, /* pc_relative */
512 complain_overflow_bitfield
,/* complain_on_overflow */
513 bfd_elf_generic_reloc
, /* special_function */
514 "R_AVR_8", /* name */
515 FALSE
, /* partial_inplace */
516 0x000000ff, /* src_mask */
517 0x000000ff, /* dst_mask */
518 FALSE
), /* pcrel_offset */
521 /* Map BFD reloc types to AVR ELF reloc types. */
525 bfd_reloc_code_real_type bfd_reloc_val
;
526 unsigned int elf_reloc_val
;
529 static const struct avr_reloc_map avr_reloc_map
[] =
531 { BFD_RELOC_NONE
, R_AVR_NONE
},
532 { BFD_RELOC_32
, R_AVR_32
},
533 { BFD_RELOC_AVR_7_PCREL
, R_AVR_7_PCREL
},
534 { BFD_RELOC_AVR_13_PCREL
, R_AVR_13_PCREL
},
535 { BFD_RELOC_16
, R_AVR_16
},
536 { BFD_RELOC_AVR_16_PM
, R_AVR_16_PM
},
537 { BFD_RELOC_AVR_LO8_LDI
, R_AVR_LO8_LDI
},
538 { BFD_RELOC_AVR_HI8_LDI
, R_AVR_HI8_LDI
},
539 { BFD_RELOC_AVR_HH8_LDI
, R_AVR_HH8_LDI
},
540 { BFD_RELOC_AVR_MS8_LDI
, R_AVR_MS8_LDI
},
541 { BFD_RELOC_AVR_LO8_LDI_NEG
, R_AVR_LO8_LDI_NEG
},
542 { BFD_RELOC_AVR_HI8_LDI_NEG
, R_AVR_HI8_LDI_NEG
},
543 { BFD_RELOC_AVR_HH8_LDI_NEG
, R_AVR_HH8_LDI_NEG
},
544 { BFD_RELOC_AVR_MS8_LDI_NEG
, R_AVR_MS8_LDI_NEG
},
545 { BFD_RELOC_AVR_LO8_LDI_PM
, R_AVR_LO8_LDI_PM
},
546 { BFD_RELOC_AVR_LO8_LDI_GS
, R_AVR_LO8_LDI_GS
},
547 { BFD_RELOC_AVR_HI8_LDI_PM
, R_AVR_HI8_LDI_PM
},
548 { BFD_RELOC_AVR_HI8_LDI_GS
, R_AVR_HI8_LDI_GS
},
549 { BFD_RELOC_AVR_HH8_LDI_PM
, R_AVR_HH8_LDI_PM
},
550 { BFD_RELOC_AVR_LO8_LDI_PM_NEG
, R_AVR_LO8_LDI_PM_NEG
},
551 { BFD_RELOC_AVR_HI8_LDI_PM_NEG
, R_AVR_HI8_LDI_PM_NEG
},
552 { BFD_RELOC_AVR_HH8_LDI_PM_NEG
, R_AVR_HH8_LDI_PM_NEG
},
553 { BFD_RELOC_AVR_CALL
, R_AVR_CALL
},
554 { BFD_RELOC_AVR_LDI
, R_AVR_LDI
},
555 { BFD_RELOC_AVR_6
, R_AVR_6
},
556 { BFD_RELOC_AVR_6_ADIW
, R_AVR_6_ADIW
},
557 { BFD_RELOC_8
, R_AVR_8
}
560 /* Meant to be filled one day with the wrap around address for the
561 specific device. I.e. should get the value 0x4000 for 16k devices,
562 0x8000 for 32k devices and so on.
564 We initialize it here with a value of 0x1000000 resulting in
565 that we will never suggest a wrap-around jump during relaxation.
566 The logic of the source code later on assumes that in
567 avr_pc_wrap_around one single bit is set. */
568 static bfd_vma avr_pc_wrap_around
= 0x10000000;
570 /* If this variable holds a value different from zero, the linker relaxation
571 machine will try to optimize call/ret sequences by a single jump
572 instruction. This option could be switched off by a linker switch. */
573 static int avr_replace_call_ret_sequences
= 1;
575 /* Initialize an entry in the stub hash table. */
577 static struct bfd_hash_entry
*
578 stub_hash_newfunc (struct bfd_hash_entry
*entry
,
579 struct bfd_hash_table
*table
,
582 /* Allocate the structure if it has not already been allocated by a
586 entry
= bfd_hash_allocate (table
,
587 sizeof (struct elf32_avr_stub_hash_entry
));
592 /* Call the allocation method of the superclass. */
593 entry
= bfd_hash_newfunc (entry
, table
, string
);
596 struct elf32_avr_stub_hash_entry
*hsh
;
598 /* Initialize the local fields. */
599 hsh
= avr_stub_hash_entry (entry
);
600 hsh
->stub_offset
= 0;
601 hsh
->target_value
= 0;
607 /* This function is just a straight passthrough to the real
608 function in linker.c. Its prupose is so that its address
609 can be compared inside the avr_link_hash_table macro. */
611 static struct bfd_hash_entry
*
612 elf32_avr_link_hash_newfunc (struct bfd_hash_entry
* entry
,
613 struct bfd_hash_table
* table
,
616 return _bfd_elf_link_hash_newfunc (entry
, table
, string
);
619 /* Create the derived linker hash table. The AVR ELF port uses the derived
620 hash table to keep information specific to the AVR ELF linker (without
621 using static variables). */
623 static struct bfd_link_hash_table
*
624 elf32_avr_link_hash_table_create (bfd
*abfd
)
626 struct elf32_avr_link_hash_table
*htab
;
627 bfd_size_type amt
= sizeof (*htab
);
629 htab
= bfd_malloc (amt
);
633 if (!_bfd_elf_link_hash_table_init (&htab
->etab
, abfd
,
634 elf32_avr_link_hash_newfunc
,
635 sizeof (struct elf_link_hash_entry
),
642 /* Init the stub hash table too. */
643 if (!bfd_hash_table_init (&htab
->bstab
, stub_hash_newfunc
,
644 sizeof (struct elf32_avr_stub_hash_entry
)))
647 htab
->stub_bfd
= NULL
;
648 htab
->stub_sec
= NULL
;
650 /* Initialize the address mapping table. */
651 htab
->amt_stub_offsets
= NULL
;
652 htab
->amt_destination_addr
= NULL
;
653 htab
->amt_entry_cnt
= 0;
654 htab
->amt_max_entry_cnt
= 0;
656 return &htab
->etab
.root
;
659 /* Free the derived linker hash table. */
662 elf32_avr_link_hash_table_free (struct bfd_link_hash_table
*btab
)
664 struct elf32_avr_link_hash_table
*htab
665 = (struct elf32_avr_link_hash_table
*) btab
;
667 /* Free the address mapping table. */
668 if (htab
->amt_stub_offsets
!= NULL
)
669 free (htab
->amt_stub_offsets
);
670 if (htab
->amt_destination_addr
!= NULL
)
671 free (htab
->amt_destination_addr
);
673 bfd_hash_table_free (&htab
->bstab
);
674 _bfd_generic_link_hash_table_free (btab
);
677 /* Calculates the effective distance of a pc relative jump/call. */
680 avr_relative_distance_considering_wrap_around (unsigned int distance
)
682 unsigned int wrap_around_mask
= avr_pc_wrap_around
- 1;
683 int dist_with_wrap_around
= distance
& wrap_around_mask
;
685 if (dist_with_wrap_around
> ((int) (avr_pc_wrap_around
>> 1)))
686 dist_with_wrap_around
-= avr_pc_wrap_around
;
688 return dist_with_wrap_around
;
692 static reloc_howto_type
*
693 bfd_elf32_bfd_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
694 bfd_reloc_code_real_type code
)
699 i
< sizeof (avr_reloc_map
) / sizeof (struct avr_reloc_map
);
701 if (avr_reloc_map
[i
].bfd_reloc_val
== code
)
702 return &elf_avr_howto_table
[avr_reloc_map
[i
].elf_reloc_val
];
707 static reloc_howto_type
*
708 bfd_elf32_bfd_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
714 i
< sizeof (elf_avr_howto_table
) / sizeof (elf_avr_howto_table
[0]);
716 if (elf_avr_howto_table
[i
].name
!= NULL
717 && strcasecmp (elf_avr_howto_table
[i
].name
, r_name
) == 0)
718 return &elf_avr_howto_table
[i
];
723 /* Set the howto pointer for an AVR ELF reloc. */
726 avr_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
728 Elf_Internal_Rela
*dst
)
732 r_type
= ELF32_R_TYPE (dst
->r_info
);
733 BFD_ASSERT (r_type
< (unsigned int) R_AVR_max
);
734 cache_ptr
->howto
= &elf_avr_howto_table
[r_type
];
738 avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation
)
740 return (relocation
>= 0x020000);
743 /* Returns the address of the corresponding stub if there is one.
744 Returns otherwise an address above 0x020000. This function
745 could also be used, if there is no knowledge on the section where
746 the destination is found. */
749 avr_get_stub_addr (bfd_vma srel
,
750 struct elf32_avr_link_hash_table
*htab
)
753 bfd_vma stub_sec_addr
=
754 (htab
->stub_sec
->output_section
->vma
+
755 htab
->stub_sec
->output_offset
);
757 for (sindex
= 0; sindex
< htab
->amt_max_entry_cnt
; sindex
++)
758 if (htab
->amt_destination_addr
[sindex
] == srel
)
759 return htab
->amt_stub_offsets
[sindex
] + stub_sec_addr
;
761 /* Return an address that could not be reached by 16 bit relocs. */
765 /* Perform a single relocation. By default we use the standard BFD
766 routines, but a few relocs, we have to do them ourselves. */
768 static bfd_reloc_status_type
769 avr_final_link_relocate (reloc_howto_type
* howto
,
771 asection
* input_section
,
773 Elf_Internal_Rela
* rel
,
775 struct elf32_avr_link_hash_table
* htab
)
777 bfd_reloc_status_type r
= bfd_reloc_ok
;
780 bfd_signed_vma reloc_addr
;
781 bfd_boolean use_stubs
= FALSE
;
782 /* Usually is 0, unless we are generating code for a bootloader. */
783 bfd_signed_vma base_addr
= htab
->vector_base
;
785 /* Absolute addr of the reloc in the final excecutable. */
786 reloc_addr
= rel
->r_offset
+ input_section
->output_section
->vma
787 + input_section
->output_offset
;
792 contents
+= rel
->r_offset
;
793 srel
= (bfd_signed_vma
) relocation
;
794 srel
+= rel
->r_addend
;
795 srel
-= rel
->r_offset
;
796 srel
-= 2; /* Branch instructions add 2 to the PC... */
797 srel
-= (input_section
->output_section
->vma
+
798 input_section
->output_offset
);
801 return bfd_reloc_outofrange
;
802 if (srel
> ((1 << 7) - 1) || (srel
< - (1 << 7)))
803 return bfd_reloc_overflow
;
804 x
= bfd_get_16 (input_bfd
, contents
);
805 x
= (x
& 0xfc07) | (((srel
>> 1) << 3) & 0x3f8);
806 bfd_put_16 (input_bfd
, x
, contents
);
810 contents
+= rel
->r_offset
;
811 srel
= (bfd_signed_vma
) relocation
;
812 srel
+= rel
->r_addend
;
813 srel
-= rel
->r_offset
;
814 srel
-= 2; /* Branch instructions add 2 to the PC... */
815 srel
-= (input_section
->output_section
->vma
+
816 input_section
->output_offset
);
819 return bfd_reloc_outofrange
;
821 srel
= avr_relative_distance_considering_wrap_around (srel
);
823 /* AVR addresses commands as words. */
826 /* Check for overflow. */
827 if (srel
< -2048 || srel
> 2047)
829 /* Relative distance is too large. */
831 /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
832 switch (bfd_get_mach (input_bfd
))
840 return bfd_reloc_overflow
;
844 x
= bfd_get_16 (input_bfd
, contents
);
845 x
= (x
& 0xf000) | (srel
& 0xfff);
846 bfd_put_16 (input_bfd
, x
, contents
);
850 contents
+= rel
->r_offset
;
851 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
852 x
= bfd_get_16 (input_bfd
, contents
);
853 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
854 bfd_put_16 (input_bfd
, x
, contents
);
858 contents
+= rel
->r_offset
;
859 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
860 if (((srel
> 0) && (srel
& 0xffff) > 255)
861 || ((srel
< 0) && ((-srel
) & 0xffff) > 128))
862 /* Remove offset for data/eeprom section. */
863 return bfd_reloc_overflow
;
865 x
= bfd_get_16 (input_bfd
, contents
);
866 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
867 bfd_put_16 (input_bfd
, x
, contents
);
871 contents
+= rel
->r_offset
;
872 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
873 if (((srel
& 0xffff) > 63) || (srel
< 0))
874 /* Remove offset for data/eeprom section. */
875 return bfd_reloc_overflow
;
876 x
= bfd_get_16 (input_bfd
, contents
);
877 x
= (x
& 0xd3f8) | ((srel
& 7) | ((srel
& (3 << 3)) << 7)
878 | ((srel
& (1 << 5)) << 8));
879 bfd_put_16 (input_bfd
, x
, contents
);
883 contents
+= rel
->r_offset
;
884 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
885 if (((srel
& 0xffff) > 63) || (srel
< 0))
886 /* Remove offset for data/eeprom section. */
887 return bfd_reloc_overflow
;
888 x
= bfd_get_16 (input_bfd
, contents
);
889 x
= (x
& 0xff30) | (srel
& 0xf) | ((srel
& 0x30) << 2);
890 bfd_put_16 (input_bfd
, x
, contents
);
894 contents
+= rel
->r_offset
;
895 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
896 srel
= (srel
>> 8) & 0xff;
897 x
= bfd_get_16 (input_bfd
, contents
);
898 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
899 bfd_put_16 (input_bfd
, x
, contents
);
903 contents
+= rel
->r_offset
;
904 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
905 srel
= (srel
>> 16) & 0xff;
906 x
= bfd_get_16 (input_bfd
, contents
);
907 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
908 bfd_put_16 (input_bfd
, x
, contents
);
912 contents
+= rel
->r_offset
;
913 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
914 srel
= (srel
>> 24) & 0xff;
915 x
= bfd_get_16 (input_bfd
, contents
);
916 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
917 bfd_put_16 (input_bfd
, x
, contents
);
920 case R_AVR_LO8_LDI_NEG
:
921 contents
+= rel
->r_offset
;
922 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
924 x
= bfd_get_16 (input_bfd
, contents
);
925 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
926 bfd_put_16 (input_bfd
, x
, contents
);
929 case R_AVR_HI8_LDI_NEG
:
930 contents
+= rel
->r_offset
;
931 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
933 srel
= (srel
>> 8) & 0xff;
934 x
= bfd_get_16 (input_bfd
, contents
);
935 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
936 bfd_put_16 (input_bfd
, x
, contents
);
939 case R_AVR_HH8_LDI_NEG
:
940 contents
+= rel
->r_offset
;
941 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
943 srel
= (srel
>> 16) & 0xff;
944 x
= bfd_get_16 (input_bfd
, contents
);
945 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
946 bfd_put_16 (input_bfd
, x
, contents
);
949 case R_AVR_MS8_LDI_NEG
:
950 contents
+= rel
->r_offset
;
951 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
953 srel
= (srel
>> 24) & 0xff;
954 x
= bfd_get_16 (input_bfd
, contents
);
955 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
956 bfd_put_16 (input_bfd
, x
, contents
);
959 case R_AVR_LO8_LDI_GS
:
960 use_stubs
= (!htab
->no_stubs
);
962 case R_AVR_LO8_LDI_PM
:
963 contents
+= rel
->r_offset
;
964 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
967 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
969 bfd_vma old_srel
= srel
;
971 /* We need to use the address of the stub instead. */
972 srel
= avr_get_stub_addr (srel
, htab
);
974 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
975 "reloc at address 0x%x.\n",
977 (unsigned int) old_srel
,
978 (unsigned int) reloc_addr
);
980 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
981 return bfd_reloc_outofrange
;
985 return bfd_reloc_outofrange
;
987 x
= bfd_get_16 (input_bfd
, contents
);
988 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
989 bfd_put_16 (input_bfd
, x
, contents
);
992 case R_AVR_HI8_LDI_GS
:
993 use_stubs
= (!htab
->no_stubs
);
995 case R_AVR_HI8_LDI_PM
:
996 contents
+= rel
->r_offset
;
997 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1000 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1002 bfd_vma old_srel
= srel
;
1004 /* We need to use the address of the stub instead. */
1005 srel
= avr_get_stub_addr (srel
, htab
);
1007 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1008 "reloc at address 0x%x.\n",
1009 (unsigned int) srel
,
1010 (unsigned int) old_srel
,
1011 (unsigned int) reloc_addr
);
1013 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1014 return bfd_reloc_outofrange
;
1018 return bfd_reloc_outofrange
;
1020 srel
= (srel
>> 8) & 0xff;
1021 x
= bfd_get_16 (input_bfd
, contents
);
1022 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1023 bfd_put_16 (input_bfd
, x
, contents
);
1026 case R_AVR_HH8_LDI_PM
:
1027 contents
+= rel
->r_offset
;
1028 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1030 return bfd_reloc_outofrange
;
1032 srel
= (srel
>> 16) & 0xff;
1033 x
= bfd_get_16 (input_bfd
, contents
);
1034 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1035 bfd_put_16 (input_bfd
, x
, contents
);
1038 case R_AVR_LO8_LDI_PM_NEG
:
1039 contents
+= rel
->r_offset
;
1040 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1043 return bfd_reloc_outofrange
;
1045 x
= bfd_get_16 (input_bfd
, contents
);
1046 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1047 bfd_put_16 (input_bfd
, x
, contents
);
1050 case R_AVR_HI8_LDI_PM_NEG
:
1051 contents
+= rel
->r_offset
;
1052 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1055 return bfd_reloc_outofrange
;
1057 srel
= (srel
>> 8) & 0xff;
1058 x
= bfd_get_16 (input_bfd
, contents
);
1059 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1060 bfd_put_16 (input_bfd
, x
, contents
);
1063 case R_AVR_HH8_LDI_PM_NEG
:
1064 contents
+= rel
->r_offset
;
1065 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1068 return bfd_reloc_outofrange
;
1070 srel
= (srel
>> 16) & 0xff;
1071 x
= bfd_get_16 (input_bfd
, contents
);
1072 x
= (x
& 0xf0f0) | (srel
& 0xf) | ((srel
<< 4) & 0xf00);
1073 bfd_put_16 (input_bfd
, x
, contents
);
1077 contents
+= rel
->r_offset
;
1078 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1080 return bfd_reloc_outofrange
;
1082 x
= bfd_get_16 (input_bfd
, contents
);
1083 x
|= ((srel
& 0x10000) | ((srel
<< 3) & 0x1f00000)) >> 16;
1084 bfd_put_16 (input_bfd
, x
, contents
);
1085 bfd_put_16 (input_bfd
, (bfd_vma
) srel
& 0xffff, contents
+2);
1089 use_stubs
= (!htab
->no_stubs
);
1090 contents
+= rel
->r_offset
;
1091 srel
= (bfd_signed_vma
) relocation
+ rel
->r_addend
;
1094 && avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1096 bfd_vma old_srel
= srel
;
1098 /* We need to use the address of the stub instead. */
1099 srel
= avr_get_stub_addr (srel
,htab
);
1101 printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
1102 "reloc at address 0x%x.\n",
1103 (unsigned int) srel
,
1104 (unsigned int) old_srel
,
1105 (unsigned int) reloc_addr
);
1107 if (avr_stub_is_required_for_16_bit_reloc (srel
- base_addr
))
1108 return bfd_reloc_outofrange
;
1112 return bfd_reloc_outofrange
;
1114 bfd_put_16 (input_bfd
, (bfd_vma
) srel
&0x00ffff, contents
);
1118 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1119 contents
, rel
->r_offset
,
1120 relocation
, rel
->r_addend
);
1126 /* Relocate an AVR ELF section. */
1129 elf32_avr_relocate_section (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1130 struct bfd_link_info
*info
,
1132 asection
*input_section
,
1134 Elf_Internal_Rela
*relocs
,
1135 Elf_Internal_Sym
*local_syms
,
1136 asection
**local_sections
)
1138 Elf_Internal_Shdr
* symtab_hdr
;
1139 struct elf_link_hash_entry
** sym_hashes
;
1140 Elf_Internal_Rela
* rel
;
1141 Elf_Internal_Rela
* relend
;
1142 struct elf32_avr_link_hash_table
* htab
= avr_link_hash_table (info
);
1147 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1148 sym_hashes
= elf_sym_hashes (input_bfd
);
1149 relend
= relocs
+ input_section
->reloc_count
;
1151 for (rel
= relocs
; rel
< relend
; rel
++)
1153 reloc_howto_type
* howto
;
1154 unsigned long r_symndx
;
1155 Elf_Internal_Sym
* sym
;
1157 struct elf_link_hash_entry
* h
;
1159 bfd_reloc_status_type r
;
1163 r_type
= ELF32_R_TYPE (rel
->r_info
);
1164 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1165 howto
= elf_avr_howto_table
+ r_type
;
1170 if (r_symndx
< symtab_hdr
->sh_info
)
1172 sym
= local_syms
+ r_symndx
;
1173 sec
= local_sections
[r_symndx
];
1174 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
1176 name
= bfd_elf_string_from_elf_section
1177 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
1178 name
= (name
== NULL
) ? bfd_section_name (input_bfd
, sec
) : name
;
1182 bfd_boolean unresolved_reloc
, warned
;
1184 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
1185 r_symndx
, symtab_hdr
, sym_hashes
,
1187 unresolved_reloc
, warned
);
1189 name
= h
->root
.root
.string
;
1192 if (sec
!= NULL
&& elf_discarded_section (sec
))
1193 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
1194 rel
, relend
, howto
, contents
);
1196 if (info
->relocatable
)
1199 r
= avr_final_link_relocate (howto
, input_bfd
, input_section
,
1200 contents
, rel
, relocation
, htab
);
1202 if (r
!= bfd_reloc_ok
)
1204 const char * msg
= (const char *) NULL
;
1208 case bfd_reloc_overflow
:
1209 r
= info
->callbacks
->reloc_overflow
1210 (info
, (h
? &h
->root
: NULL
),
1211 name
, howto
->name
, (bfd_vma
) 0,
1212 input_bfd
, input_section
, rel
->r_offset
);
1215 case bfd_reloc_undefined
:
1216 r
= info
->callbacks
->undefined_symbol
1217 (info
, name
, input_bfd
, input_section
, rel
->r_offset
, TRUE
);
1220 case bfd_reloc_outofrange
:
1221 msg
= _("internal error: out of range error");
1224 case bfd_reloc_notsupported
:
1225 msg
= _("internal error: unsupported relocation error");
1228 case bfd_reloc_dangerous
:
1229 msg
= _("internal error: dangerous relocation");
1233 msg
= _("internal error: unknown error");
1238 r
= info
->callbacks
->warning
1239 (info
, msg
, name
, input_bfd
, input_section
, rel
->r_offset
);
1249 /* The final processing done just before writing out a AVR ELF object
1250 file. This gets the AVR architecture right based on the machine
1254 bfd_elf_avr_final_write_processing (bfd
*abfd
,
1255 bfd_boolean linker ATTRIBUTE_UNUSED
)
1259 switch (bfd_get_mach (abfd
))
1263 val
= E_AVR_MACH_AVR2
;
1267 val
= E_AVR_MACH_AVR1
;
1270 case bfd_mach_avr25
:
1271 val
= E_AVR_MACH_AVR25
;
1275 val
= E_AVR_MACH_AVR3
;
1278 case bfd_mach_avr31
:
1279 val
= E_AVR_MACH_AVR31
;
1282 case bfd_mach_avr35
:
1283 val
= E_AVR_MACH_AVR35
;
1287 val
= E_AVR_MACH_AVR4
;
1291 val
= E_AVR_MACH_AVR5
;
1294 case bfd_mach_avr51
:
1295 val
= E_AVR_MACH_AVR51
;
1299 val
= E_AVR_MACH_AVR6
;
1302 case bfd_mach_avrxmega1
:
1303 val
= E_AVR_MACH_XMEGA1
;
1306 case bfd_mach_avrxmega2
:
1307 val
= E_AVR_MACH_XMEGA2
;
1310 case bfd_mach_avrxmega3
:
1311 val
= E_AVR_MACH_XMEGA3
;
1314 case bfd_mach_avrxmega4
:
1315 val
= E_AVR_MACH_XMEGA4
;
1318 case bfd_mach_avrxmega5
:
1319 val
= E_AVR_MACH_XMEGA5
;
1322 case bfd_mach_avrxmega6
:
1323 val
= E_AVR_MACH_XMEGA6
;
1326 case bfd_mach_avrxmega7
:
1327 val
= E_AVR_MACH_XMEGA7
;
1331 elf_elfheader (abfd
)->e_machine
= EM_AVR
;
1332 elf_elfheader (abfd
)->e_flags
&= ~ EF_AVR_MACH
;
1333 elf_elfheader (abfd
)->e_flags
|= val
;
1334 elf_elfheader (abfd
)->e_flags
|= EF_AVR_LINKRELAX_PREPARED
;
1337 /* Set the right machine number. */
1340 elf32_avr_object_p (bfd
*abfd
)
1342 unsigned int e_set
= bfd_mach_avr2
;
1344 if (elf_elfheader (abfd
)->e_machine
== EM_AVR
1345 || elf_elfheader (abfd
)->e_machine
== EM_AVR_OLD
)
1347 int e_mach
= elf_elfheader (abfd
)->e_flags
& EF_AVR_MACH
;
1352 case E_AVR_MACH_AVR2
:
1353 e_set
= bfd_mach_avr2
;
1356 case E_AVR_MACH_AVR1
:
1357 e_set
= bfd_mach_avr1
;
1360 case E_AVR_MACH_AVR25
:
1361 e_set
= bfd_mach_avr25
;
1364 case E_AVR_MACH_AVR3
:
1365 e_set
= bfd_mach_avr3
;
1368 case E_AVR_MACH_AVR31
:
1369 e_set
= bfd_mach_avr31
;
1372 case E_AVR_MACH_AVR35
:
1373 e_set
= bfd_mach_avr35
;
1376 case E_AVR_MACH_AVR4
:
1377 e_set
= bfd_mach_avr4
;
1380 case E_AVR_MACH_AVR5
:
1381 e_set
= bfd_mach_avr5
;
1384 case E_AVR_MACH_AVR51
:
1385 e_set
= bfd_mach_avr51
;
1388 case E_AVR_MACH_AVR6
:
1389 e_set
= bfd_mach_avr6
;
1392 case E_AVR_MACH_XMEGA1
:
1393 e_set
= bfd_mach_avrxmega1
;
1396 case E_AVR_MACH_XMEGA2
:
1397 e_set
= bfd_mach_avrxmega2
;
1400 case E_AVR_MACH_XMEGA3
:
1401 e_set
= bfd_mach_avrxmega3
;
1404 case E_AVR_MACH_XMEGA4
:
1405 e_set
= bfd_mach_avrxmega4
;
1408 case E_AVR_MACH_XMEGA5
:
1409 e_set
= bfd_mach_avrxmega5
;
1412 case E_AVR_MACH_XMEGA6
:
1413 e_set
= bfd_mach_avrxmega6
;
1416 case E_AVR_MACH_XMEGA7
:
1417 e_set
= bfd_mach_avrxmega7
;
1421 return bfd_default_set_arch_mach (abfd
, bfd_arch_avr
,
1426 /* Delete some bytes from a section while changing the size of an instruction.
1427 The parameter "addr" denotes the section-relative offset pointing just
1428 behind the shrinked instruction. "addr+count" point at the first
1429 byte just behind the original unshrinked instruction. */
1432 elf32_avr_relax_delete_bytes (bfd
*abfd
,
1437 Elf_Internal_Shdr
*symtab_hdr
;
1438 unsigned int sec_shndx
;
1440 Elf_Internal_Rela
*irel
, *irelend
;
1441 Elf_Internal_Sym
*isym
;
1442 Elf_Internal_Sym
*isymbuf
= NULL
;
1444 struct elf_link_hash_entry
**sym_hashes
;
1445 struct elf_link_hash_entry
**end_hashes
;
1446 unsigned int symcount
;
1448 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1449 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
1450 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1454 irel
= elf_section_data (sec
)->relocs
;
1455 irelend
= irel
+ sec
->reloc_count
;
1457 /* Actually delete the bytes. */
1458 if (toaddr
- addr
- count
> 0)
1459 memmove (contents
+ addr
, contents
+ addr
+ count
,
1460 (size_t) (toaddr
- addr
- count
));
1463 /* Adjust all the reloc addresses. */
1464 for (irel
= elf_section_data (sec
)->relocs
; irel
< irelend
; irel
++)
1466 bfd_vma old_reloc_address
;
1468 old_reloc_address
= (sec
->output_section
->vma
1469 + sec
->output_offset
+ irel
->r_offset
);
1471 /* Get the new reloc address. */
1472 if ((irel
->r_offset
> addr
1473 && irel
->r_offset
< toaddr
))
1476 printf ("Relocation at address 0x%x needs to be moved.\n"
1477 "Old section offset: 0x%x, New section offset: 0x%x \n",
1478 (unsigned int) old_reloc_address
,
1479 (unsigned int) irel
->r_offset
,
1480 (unsigned int) ((irel
->r_offset
) - count
));
1482 irel
->r_offset
-= count
;
1487 /* The reloc's own addresses are now ok. However, we need to readjust
1488 the reloc's addend, i.e. the reloc's value if two conditions are met:
1489 1.) the reloc is relative to a symbol in this section that
1490 is located in front of the shrinked instruction
1491 2.) symbol plus addend end up behind the shrinked instruction.
1493 The most common case where this happens are relocs relative to
1494 the section-start symbol.
1496 This step needs to be done for all of the sections of the bfd. */
1499 struct bfd_section
*isec
;
1501 for (isec
= abfd
->sections
; isec
; isec
= isec
->next
)
1504 bfd_vma shrinked_insn_address
;
1506 shrinked_insn_address
= (sec
->output_section
->vma
1507 + sec
->output_offset
+ addr
- count
);
1509 irelend
= elf_section_data (isec
)->relocs
+ isec
->reloc_count
;
1510 for (irel
= elf_section_data (isec
)->relocs
;
1514 /* Read this BFD's local symbols if we haven't done
1516 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
1518 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1519 if (isymbuf
== NULL
)
1520 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1521 symtab_hdr
->sh_info
, 0,
1523 if (isymbuf
== NULL
)
1527 /* Get the value of the symbol referred to by the reloc. */
1528 if (ELF32_R_SYM (irel
->r_info
) < symtab_hdr
->sh_info
)
1530 /* A local symbol. */
1533 isym
= isymbuf
+ ELF32_R_SYM (irel
->r_info
);
1534 sym_sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1535 symval
= isym
->st_value
;
1536 /* If the reloc is absolute, it will not have
1537 a symbol or section associated with it. */
1540 symval
+= sym_sec
->output_section
->vma
1541 + sym_sec
->output_offset
;
1544 printf ("Checking if the relocation's "
1545 "addend needs corrections.\n"
1546 "Address of anchor symbol: 0x%x \n"
1547 "Address of relocation target: 0x%x \n"
1548 "Address of relaxed insn: 0x%x \n",
1549 (unsigned int) symval
,
1550 (unsigned int) (symval
+ irel
->r_addend
),
1551 (unsigned int) shrinked_insn_address
);
1553 if (symval
<= shrinked_insn_address
1554 && (symval
+ irel
->r_addend
) > shrinked_insn_address
)
1556 irel
->r_addend
-= count
;
1559 printf ("Relocation's addend needed to be fixed \n");
1562 /* else...Reference symbol is absolute. No adjustment needed. */
1564 /* else...Reference symbol is extern. No need for adjusting
1570 /* Adjust the local symbols defined in this section. */
1571 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1572 /* Fix PR 9841, there may be no local symbols. */
1575 Elf_Internal_Sym
*isymend
;
1577 isymend
= isym
+ symtab_hdr
->sh_info
;
1578 for (; isym
< isymend
; isym
++)
1580 if (isym
->st_shndx
== sec_shndx
1581 && isym
->st_value
> addr
1582 && isym
->st_value
< toaddr
)
1583 isym
->st_value
-= count
;
1587 /* Now adjust the global symbols defined in this section. */
1588 symcount
= (symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
)
1589 - symtab_hdr
->sh_info
);
1590 sym_hashes
= elf_sym_hashes (abfd
);
1591 end_hashes
= sym_hashes
+ symcount
;
1592 for (; sym_hashes
< end_hashes
; sym_hashes
++)
1594 struct elf_link_hash_entry
*sym_hash
= *sym_hashes
;
1595 if ((sym_hash
->root
.type
== bfd_link_hash_defined
1596 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
1597 && sym_hash
->root
.u
.def
.section
== sec
1598 && sym_hash
->root
.u
.def
.value
> addr
1599 && sym_hash
->root
.u
.def
.value
< toaddr
)
1601 sym_hash
->root
.u
.def
.value
-= count
;
1608 /* This function handles relaxing for the avr.
1609 Many important relaxing opportunities within functions are already
1610 realized by the compiler itself.
1611 Here we try to replace call (4 bytes) -> rcall (2 bytes)
1612 and jump -> rjmp (safes also 2 bytes).
1613 As well we now optimize seqences of
1614 - call/rcall function
1619 . In case that within a sequence
1622 the ret could no longer be reached it is optimized away. In order
1623 to check if the ret is no longer needed, it is checked that the ret's address
1624 is not the target of a branch or jump within the same section, it is checked
1625 that there is no skip instruction before the jmp/rjmp and that there
1626 is no local or global label place at the address of the ret.
1628 We refrain from relaxing within sections ".vectors" and
1629 ".jumptables" in order to maintain the position of the instructions.
1630 There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
1631 if possible. (In future one could possibly use the space of the nop
1632 for the first instruction of the irq service function.
1634 The .jumptables sections is meant to be used for a future tablejump variant
1635 for the devices with 3-byte program counter where the table itself
1636 contains 4-byte jump instructions whose relative offset must not
1640 elf32_avr_relax_section (bfd
*abfd
,
1642 struct bfd_link_info
*link_info
,
1645 Elf_Internal_Shdr
*symtab_hdr
;
1646 Elf_Internal_Rela
*internal_relocs
;
1647 Elf_Internal_Rela
*irel
, *irelend
;
1648 bfd_byte
*contents
= NULL
;
1649 Elf_Internal_Sym
*isymbuf
= NULL
;
1650 struct elf32_avr_link_hash_table
*htab
;
1652 if (link_info
->relocatable
)
1653 (*link_info
->callbacks
->einfo
)
1654 (_("%P%F: --relax and -r may not be used together\n"));
1656 htab
= avr_link_hash_table (link_info
);
1660 /* Assume nothing changes. */
1663 if ((!htab
->no_stubs
) && (sec
== htab
->stub_sec
))
1665 /* We are just relaxing the stub section.
1666 Let's calculate the size needed again. */
1667 bfd_size_type last_estimated_stub_section_size
= htab
->stub_sec
->size
;
1670 printf ("Relaxing the stub section. Size prior to this pass: %i\n",
1671 (int) last_estimated_stub_section_size
);
1673 elf32_avr_size_stubs (htab
->stub_sec
->output_section
->owner
,
1676 /* Check if the number of trampolines changed. */
1677 if (last_estimated_stub_section_size
!= htab
->stub_sec
->size
)
1681 printf ("Size of stub section after this pass: %i\n",
1682 (int) htab
->stub_sec
->size
);
1687 /* We don't have to do anything for a relocatable link, if
1688 this section does not have relocs, or if this is not a
1690 if (link_info
->relocatable
1691 || (sec
->flags
& SEC_RELOC
) == 0
1692 || sec
->reloc_count
== 0
1693 || (sec
->flags
& SEC_CODE
) == 0)
1696 /* Check if the object file to relax uses internal symbols so that we
1697 could fix up the relocations. */
1698 if (!(elf_elfheader (abfd
)->e_flags
& EF_AVR_LINKRELAX_PREPARED
))
1701 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1703 /* Get a copy of the native relocations. */
1704 internal_relocs
= (_bfd_elf_link_read_relocs
1705 (abfd
, sec
, NULL
, NULL
, link_info
->keep_memory
));
1706 if (internal_relocs
== NULL
)
1709 /* Walk through the relocs looking for relaxing opportunities. */
1710 irelend
= internal_relocs
+ sec
->reloc_count
;
1711 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
1715 if ( ELF32_R_TYPE (irel
->r_info
) != R_AVR_13_PCREL
1716 && ELF32_R_TYPE (irel
->r_info
) != R_AVR_7_PCREL
1717 && ELF32_R_TYPE (irel
->r_info
) != R_AVR_CALL
)
1720 /* Get the section contents if we haven't done so already. */
1721 if (contents
== NULL
)
1723 /* Get cached copy if it exists. */
1724 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1725 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1728 /* Go get them off disk. */
1729 if (! bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1734 /* Read this BFD's local symbols if we haven't done so already. */
1735 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
1737 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1738 if (isymbuf
== NULL
)
1739 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1740 symtab_hdr
->sh_info
, 0,
1742 if (isymbuf
== NULL
)
1747 /* Get the value of the symbol referred to by the reloc. */
1748 if (ELF32_R_SYM (irel
->r_info
) < symtab_hdr
->sh_info
)
1750 /* A local symbol. */
1751 Elf_Internal_Sym
*isym
;
1754 isym
= isymbuf
+ ELF32_R_SYM (irel
->r_info
);
1755 sym_sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1756 symval
= isym
->st_value
;
1757 /* If the reloc is absolute, it will not have
1758 a symbol or section associated with it. */
1760 symval
+= sym_sec
->output_section
->vma
1761 + sym_sec
->output_offset
;
1766 struct elf_link_hash_entry
*h
;
1768 /* An external symbol. */
1769 indx
= ELF32_R_SYM (irel
->r_info
) - symtab_hdr
->sh_info
;
1770 h
= elf_sym_hashes (abfd
)[indx
];
1771 BFD_ASSERT (h
!= NULL
);
1772 if (h
->root
.type
!= bfd_link_hash_defined
1773 && h
->root
.type
!= bfd_link_hash_defweak
)
1774 /* This appears to be a reference to an undefined
1775 symbol. Just ignore it--it will be caught by the
1776 regular reloc processing. */
1779 symval
= (h
->root
.u
.def
.value
1780 + h
->root
.u
.def
.section
->output_section
->vma
1781 + h
->root
.u
.def
.section
->output_offset
);
1784 /* For simplicity of coding, we are going to modify the section
1785 contents, the section relocs, and the BFD symbol table. We
1786 must tell the rest of the code not to free up this
1787 information. It would be possible to instead create a table
1788 of changes which have to be made, as is done in coff-mips.c;
1789 that would be more work, but would require less memory when
1790 the linker is run. */
1791 switch (ELF32_R_TYPE (irel
->r_info
))
1793 /* Try to turn a 22-bit absolute call/jump into an 13-bit
1794 pc-relative rcall/rjmp. */
1797 bfd_vma value
= symval
+ irel
->r_addend
;
1799 int distance_short_enough
= 0;
1801 /* Get the address of this instruction. */
1802 dot
= (sec
->output_section
->vma
1803 + sec
->output_offset
+ irel
->r_offset
);
1805 /* Compute the distance from this insn to the branch target. */
1808 /* If the distance is within -4094..+4098 inclusive, then we can
1809 relax this jump/call. +4098 because the call/jump target
1810 will be closer after the relaxation. */
1811 if ((int) gap
>= -4094 && (int) gap
<= 4098)
1812 distance_short_enough
= 1;
1814 /* Here we handle the wrap-around case. E.g. for a 16k device
1815 we could use a rjmp to jump from address 0x100 to 0x3d00!
1816 In order to make this work properly, we need to fill the
1817 vaiable avr_pc_wrap_around with the appropriate value.
1818 I.e. 0x4000 for a 16k device. */
1820 /* Shrinking the code size makes the gaps larger in the
1821 case of wrap-arounds. So we use a heuristical safety
1822 margin to avoid that during relax the distance gets
1823 again too large for the short jumps. Let's assume
1824 a typical code-size reduction due to relax for a
1825 16k device of 600 bytes. So let's use twice the
1826 typical value as safety margin. */
1830 int assumed_shrink
= 600;
1831 if (avr_pc_wrap_around
> 0x4000)
1832 assumed_shrink
= 900;
1834 safety_margin
= 2 * assumed_shrink
;
1836 rgap
= avr_relative_distance_considering_wrap_around (gap
);
1838 if (rgap
>= (-4092 + safety_margin
)
1839 && rgap
<= (4094 - safety_margin
))
1840 distance_short_enough
= 1;
1843 if (distance_short_enough
)
1845 unsigned char code_msb
;
1846 unsigned char code_lsb
;
1849 printf ("shrinking jump/call instruction at address 0x%x"
1850 " in section %s\n\n",
1851 (int) dot
, sec
->name
);
1853 /* Note that we've changed the relocs, section contents,
1855 elf_section_data (sec
)->relocs
= internal_relocs
;
1856 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1857 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
1859 /* Get the instruction code for relaxing. */
1860 code_lsb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
);
1861 code_msb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 1);
1863 /* Mask out the relocation bits. */
1866 if (code_msb
== 0x94 && code_lsb
== 0x0E)
1868 /* we are changing call -> rcall . */
1869 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
);
1870 bfd_put_8 (abfd
, 0xD0, contents
+ irel
->r_offset
+ 1);
1872 else if (code_msb
== 0x94 && code_lsb
== 0x0C)
1874 /* we are changeing jump -> rjmp. */
1875 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
);
1876 bfd_put_8 (abfd
, 0xC0, contents
+ irel
->r_offset
+ 1);
1881 /* Fix the relocation's type. */
1882 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
1885 /* Check for the vector section. There we don't want to
1886 modify the ordering! */
1888 if (!strcmp (sec
->name
,".vectors")
1889 || !strcmp (sec
->name
,".jumptables"))
1891 /* Let's insert a nop. */
1892 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
+ 2);
1893 bfd_put_8 (abfd
, 0x00, contents
+ irel
->r_offset
+ 3);
1897 /* Delete two bytes of data. */
1898 if (!elf32_avr_relax_delete_bytes (abfd
, sec
,
1899 irel
->r_offset
+ 2, 2))
1902 /* That will change things, so, we should relax again.
1903 Note that this is not required, and it may be slow. */
1911 unsigned char code_msb
;
1912 unsigned char code_lsb
;
1915 code_msb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 1);
1916 code_lsb
= bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 0);
1918 /* Get the address of this instruction. */
1919 dot
= (sec
->output_section
->vma
1920 + sec
->output_offset
+ irel
->r_offset
);
1922 /* Here we look for rcall/ret or call/ret sequences that could be
1923 safely replaced by rjmp/ret or jmp/ret. */
1924 if (((code_msb
& 0xf0) == 0xd0)
1925 && avr_replace_call_ret_sequences
)
1927 /* This insn is a rcall. */
1928 unsigned char next_insn_msb
= 0;
1929 unsigned char next_insn_lsb
= 0;
1931 if (irel
->r_offset
+ 3 < sec
->size
)
1934 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 3);
1936 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 2);
1939 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
1941 /* The next insn is a ret. We now convert the rcall insn
1942 into a rjmp instruction. */
1944 bfd_put_8 (abfd
, code_msb
, contents
+ irel
->r_offset
+ 1);
1946 printf ("converted rcall/ret sequence at address 0x%x"
1947 " into rjmp/ret sequence. Section is %s\n\n",
1948 (int) dot
, sec
->name
);
1953 else if ((0x94 == (code_msb
& 0xfe))
1954 && (0x0e == (code_lsb
& 0x0e))
1955 && avr_replace_call_ret_sequences
)
1957 /* This insn is a call. */
1958 unsigned char next_insn_msb
= 0;
1959 unsigned char next_insn_lsb
= 0;
1961 if (irel
->r_offset
+ 5 < sec
->size
)
1964 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 5);
1966 bfd_get_8 (abfd
, contents
+ irel
->r_offset
+ 4);
1969 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
1971 /* The next insn is a ret. We now convert the call insn
1972 into a jmp instruction. */
1975 bfd_put_8 (abfd
, code_lsb
, contents
+ irel
->r_offset
);
1977 printf ("converted call/ret sequence at address 0x%x"
1978 " into jmp/ret sequence. Section is %s\n\n",
1979 (int) dot
, sec
->name
);
1984 else if ((0xc0 == (code_msb
& 0xf0))
1985 || ((0x94 == (code_msb
& 0xfe))
1986 && (0x0c == (code_lsb
& 0x0e))))
1988 /* This insn is a rjmp or a jmp. */
1989 unsigned char next_insn_msb
= 0;
1990 unsigned char next_insn_lsb
= 0;
1993 if (0xc0 == (code_msb
& 0xf0))
1994 insn_size
= 2; /* rjmp insn */
1996 insn_size
= 4; /* jmp insn */
1998 if (irel
->r_offset
+ insn_size
+ 1 < sec
->size
)
2001 bfd_get_8 (abfd
, contents
+ irel
->r_offset
2004 bfd_get_8 (abfd
, contents
+ irel
->r_offset
2008 if ((0x95 == next_insn_msb
) && (0x08 == next_insn_lsb
))
2010 /* The next insn is a ret. We possibly could delete
2011 this ret. First we need to check for preceeding
2012 sbis/sbic/sbrs or cpse "skip" instructions. */
2014 int there_is_preceeding_non_skip_insn
= 1;
2015 bfd_vma address_of_ret
;
2017 address_of_ret
= dot
+ insn_size
;
2019 if (debug_relax
&& (insn_size
== 2))
2020 printf ("found rjmp / ret sequence at address 0x%x\n",
2022 if (debug_relax
&& (insn_size
== 4))
2023 printf ("found jmp / ret sequence at address 0x%x\n",
2026 /* We have to make sure that there is a preceeding insn. */
2027 if (irel
->r_offset
>= 2)
2029 unsigned char preceeding_msb
;
2030 unsigned char preceeding_lsb
;
2032 bfd_get_8 (abfd
, contents
+ irel
->r_offset
- 1);
2034 bfd_get_8 (abfd
, contents
+ irel
->r_offset
- 2);
2037 if (0x99 == preceeding_msb
)
2038 there_is_preceeding_non_skip_insn
= 0;
2041 if (0x9b == preceeding_msb
)
2042 there_is_preceeding_non_skip_insn
= 0;
2045 if ((0xfc == (preceeding_msb
& 0xfe)
2046 && (0x00 == (preceeding_lsb
& 0x08))))
2047 there_is_preceeding_non_skip_insn
= 0;
2050 if ((0xfe == (preceeding_msb
& 0xfe)
2051 && (0x00 == (preceeding_lsb
& 0x08))))
2052 there_is_preceeding_non_skip_insn
= 0;
2055 if (0x10 == (preceeding_msb
& 0xfc))
2056 there_is_preceeding_non_skip_insn
= 0;
2058 if (there_is_preceeding_non_skip_insn
== 0)
2060 printf ("preceeding skip insn prevents deletion of"
2061 " ret insn at addr 0x%x in section %s\n",
2062 (int) dot
+ 2, sec
->name
);
2066 /* There is no previous instruction. */
2067 there_is_preceeding_non_skip_insn
= 0;
2070 if (there_is_preceeding_non_skip_insn
)
2072 /* We now only have to make sure that there is no
2073 local label defined at the address of the ret
2074 instruction and that there is no local relocation
2075 in this section pointing to the ret. */
2077 int deleting_ret_is_safe
= 1;
2078 unsigned int section_offset_of_ret_insn
=
2079 irel
->r_offset
+ insn_size
;
2080 Elf_Internal_Sym
*isym
, *isymend
;
2081 unsigned int sec_shndx
;
2084 _bfd_elf_section_from_bfd_section (abfd
, sec
);
2086 /* Check for local symbols. */
2087 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2088 isymend
= isym
+ symtab_hdr
->sh_info
;
2089 /* PR 6019: There may not be any local symbols. */
2090 for (; isym
!= NULL
&& isym
< isymend
; isym
++)
2092 if (isym
->st_value
== section_offset_of_ret_insn
2093 && isym
->st_shndx
== sec_shndx
)
2095 deleting_ret_is_safe
= 0;
2097 printf ("local label prevents deletion of ret "
2098 "insn at address 0x%x\n",
2099 (int) dot
+ insn_size
);
2103 /* Now check for global symbols. */
2106 struct elf_link_hash_entry
**sym_hashes
;
2107 struct elf_link_hash_entry
**end_hashes
;
2109 symcount
= (symtab_hdr
->sh_size
2110 / sizeof (Elf32_External_Sym
)
2111 - symtab_hdr
->sh_info
);
2112 sym_hashes
= elf_sym_hashes (abfd
);
2113 end_hashes
= sym_hashes
+ symcount
;
2114 for (; sym_hashes
< end_hashes
; sym_hashes
++)
2116 struct elf_link_hash_entry
*sym_hash
=
2118 if ((sym_hash
->root
.type
== bfd_link_hash_defined
2119 || sym_hash
->root
.type
==
2120 bfd_link_hash_defweak
)
2121 && sym_hash
->root
.u
.def
.section
== sec
2122 && sym_hash
->root
.u
.def
.value
== section_offset_of_ret_insn
)
2124 deleting_ret_is_safe
= 0;
2126 printf ("global label prevents deletion of "
2127 "ret insn at address 0x%x\n",
2128 (int) dot
+ insn_size
);
2132 /* Now we check for relocations pointing to ret. */
2134 Elf_Internal_Rela
*rel
;
2135 Elf_Internal_Rela
*relend
;
2137 relend
= elf_section_data (sec
)->relocs
2140 for (rel
= elf_section_data (sec
)->relocs
;
2141 rel
< relend
; rel
++)
2143 bfd_vma reloc_target
= 0;
2145 /* Read this BFD's local symbols if we haven't
2147 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
2149 isymbuf
= (Elf_Internal_Sym
*)
2150 symtab_hdr
->contents
;
2151 if (isymbuf
== NULL
)
2152 isymbuf
= bfd_elf_get_elf_syms
2155 symtab_hdr
->sh_info
, 0,
2157 if (isymbuf
== NULL
)
2161 /* Get the value of the symbol referred to
2163 if (ELF32_R_SYM (rel
->r_info
)
2164 < symtab_hdr
->sh_info
)
2166 /* A local symbol. */
2170 + ELF32_R_SYM (rel
->r_info
);
2171 sym_sec
= bfd_section_from_elf_index
2172 (abfd
, isym
->st_shndx
);
2173 symval
= isym
->st_value
;
2175 /* If the reloc is absolute, it will not
2176 have a symbol or section associated
2182 sym_sec
->output_section
->vma
2183 + sym_sec
->output_offset
;
2184 reloc_target
= symval
+ rel
->r_addend
;
2188 reloc_target
= symval
+ rel
->r_addend
;
2189 /* Reference symbol is absolute. */
2192 /* else ... reference symbol is extern. */
2194 if (address_of_ret
== reloc_target
)
2196 deleting_ret_is_safe
= 0;
2199 "rjmp/jmp ret sequence at address"
2200 " 0x%x could not be deleted. ret"
2201 " is target of a relocation.\n",
2202 (int) address_of_ret
);
2207 if (deleting_ret_is_safe
)
2210 printf ("unreachable ret instruction "
2211 "at address 0x%x deleted.\n",
2212 (int) dot
+ insn_size
);
2214 /* Delete two bytes of data. */
2215 if (!elf32_avr_relax_delete_bytes (abfd
, sec
,
2216 irel
->r_offset
+ insn_size
, 2))
2219 /* That will change things, so, we should relax
2220 again. Note that this is not required, and it
2234 if (contents
!= NULL
2235 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2237 if (! link_info
->keep_memory
)
2241 /* Cache the section contents for elf_link_input_bfd. */
2242 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2246 if (internal_relocs
!= NULL
2247 && elf_section_data (sec
)->relocs
!= internal_relocs
)
2248 free (internal_relocs
);
2254 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
2256 if (contents
!= NULL
2257 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2259 if (internal_relocs
!= NULL
2260 && elf_section_data (sec
)->relocs
!= internal_relocs
)
2261 free (internal_relocs
);
2266 /* This is a version of bfd_generic_get_relocated_section_contents
2267 which uses elf32_avr_relocate_section.
2269 For avr it's essentially a cut and paste taken from the H8300 port.
2270 The author of the relaxation support patch for avr had absolutely no
2271 clue what is happening here but found out that this part of the code
2272 seems to be important. */
2275 elf32_avr_get_relocated_section_contents (bfd
*output_bfd
,
2276 struct bfd_link_info
*link_info
,
2277 struct bfd_link_order
*link_order
,
2279 bfd_boolean relocatable
,
2282 Elf_Internal_Shdr
*symtab_hdr
;
2283 asection
*input_section
= link_order
->u
.indirect
.section
;
2284 bfd
*input_bfd
= input_section
->owner
;
2285 asection
**sections
= NULL
;
2286 Elf_Internal_Rela
*internal_relocs
= NULL
;
2287 Elf_Internal_Sym
*isymbuf
= NULL
;
2289 /* We only need to handle the case of relaxing, or of having a
2290 particular set of section contents, specially. */
2292 || elf_section_data (input_section
)->this_hdr
.contents
== NULL
)
2293 return bfd_generic_get_relocated_section_contents (output_bfd
, link_info
,
2297 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2299 memcpy (data
, elf_section_data (input_section
)->this_hdr
.contents
,
2300 (size_t) input_section
->size
);
2302 if ((input_section
->flags
& SEC_RELOC
) != 0
2303 && input_section
->reloc_count
> 0)
2306 Elf_Internal_Sym
*isym
, *isymend
;
2309 internal_relocs
= (_bfd_elf_link_read_relocs
2310 (input_bfd
, input_section
, NULL
, NULL
, FALSE
));
2311 if (internal_relocs
== NULL
)
2314 if (symtab_hdr
->sh_info
!= 0)
2316 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2317 if (isymbuf
== NULL
)
2318 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
,
2319 symtab_hdr
->sh_info
, 0,
2321 if (isymbuf
== NULL
)
2325 amt
= symtab_hdr
->sh_info
;
2326 amt
*= sizeof (asection
*);
2327 sections
= bfd_malloc (amt
);
2328 if (sections
== NULL
&& amt
!= 0)
2331 isymend
= isymbuf
+ symtab_hdr
->sh_info
;
2332 for (isym
= isymbuf
, secpp
= sections
; isym
< isymend
; ++isym
, ++secpp
)
2336 if (isym
->st_shndx
== SHN_UNDEF
)
2337 isec
= bfd_und_section_ptr
;
2338 else if (isym
->st_shndx
== SHN_ABS
)
2339 isec
= bfd_abs_section_ptr
;
2340 else if (isym
->st_shndx
== SHN_COMMON
)
2341 isec
= bfd_com_section_ptr
;
2343 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
2348 if (! elf32_avr_relocate_section (output_bfd
, link_info
, input_bfd
,
2349 input_section
, data
, internal_relocs
,
2353 if (sections
!= NULL
)
2356 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
2358 if (elf_section_data (input_section
)->relocs
!= internal_relocs
)
2359 free (internal_relocs
);
2365 if (sections
!= NULL
)
2368 && symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
2370 if (internal_relocs
!= NULL
2371 && elf_section_data (input_section
)->relocs
!= internal_relocs
)
2372 free (internal_relocs
);
2377 /* Determines the hash entry name for a particular reloc. It consists of
2378 the identifier of the symbol section and the added reloc addend and
2379 symbol offset relative to the section the symbol is attached to. */
2382 avr_stub_name (const asection
*symbol_section
,
2383 const bfd_vma symbol_offset
,
2384 const Elf_Internal_Rela
*rela
)
2389 len
= 8 + 1 + 8 + 1 + 1;
2390 stub_name
= bfd_malloc (len
);
2392 sprintf (stub_name
, "%08x+%08x",
2393 symbol_section
->id
& 0xffffffff,
2394 (unsigned int) ((rela
->r_addend
& 0xffffffff) + symbol_offset
));
2400 /* Add a new stub entry to the stub hash. Not all fields of the new
2401 stub entry are initialised. */
2403 static struct elf32_avr_stub_hash_entry
*
2404 avr_add_stub (const char *stub_name
,
2405 struct elf32_avr_link_hash_table
*htab
)
2407 struct elf32_avr_stub_hash_entry
*hsh
;
2409 /* Enter this entry into the linker stub hash table. */
2410 hsh
= avr_stub_hash_lookup (&htab
->bstab
, stub_name
, TRUE
, FALSE
);
2414 (*_bfd_error_handler
) (_("%B: cannot create stub entry %s"),
2419 hsh
->stub_offset
= 0;
2423 /* We assume that there is already space allocated for the stub section
2424 contents and that before building the stubs the section size is
2425 initialized to 0. We assume that within the stub hash table entry,
2426 the absolute position of the jmp target has been written in the
2427 target_value field. We write here the offset of the generated jmp insn
2428 relative to the trampoline section start to the stub_offset entry in
2429 the stub hash table entry. */
2432 avr_build_one_stub (struct bfd_hash_entry
*bh
, void *in_arg
)
2434 struct elf32_avr_stub_hash_entry
*hsh
;
2435 struct bfd_link_info
*info
;
2436 struct elf32_avr_link_hash_table
*htab
;
2443 bfd_vma jmp_insn
= 0x0000940c;
2445 /* Massage our args to the form they really have. */
2446 hsh
= avr_stub_hash_entry (bh
);
2448 if (!hsh
->is_actually_needed
)
2451 info
= (struct bfd_link_info
*) in_arg
;
2453 htab
= avr_link_hash_table (info
);
2457 target
= hsh
->target_value
;
2459 /* Make a note of the offset within the stubs for this entry. */
2460 hsh
->stub_offset
= htab
->stub_sec
->size
;
2461 loc
= htab
->stub_sec
->contents
+ hsh
->stub_offset
;
2463 stub_bfd
= htab
->stub_sec
->owner
;
2466 printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
2467 (unsigned int) target
,
2468 (unsigned int) hsh
->stub_offset
);
2470 /* We now have to add the information on the jump target to the bare
2471 opcode bits already set in jmp_insn. */
2473 /* Check for the alignment of the address. */
2477 starget
= target
>> 1;
2478 jmp_insn
|= ((starget
& 0x10000) | ((starget
<< 3) & 0x1f00000)) >> 16;
2479 bfd_put_16 (stub_bfd
, jmp_insn
, loc
);
2480 bfd_put_16 (stub_bfd
, (bfd_vma
) starget
& 0xffff, loc
+ 2);
2482 htab
->stub_sec
->size
+= 4;
2484 /* Now add the entries in the address mapping table if there is still
2489 nr
= htab
->amt_entry_cnt
+ 1;
2490 if (nr
<= htab
->amt_max_entry_cnt
)
2492 htab
->amt_entry_cnt
= nr
;
2494 htab
->amt_stub_offsets
[nr
- 1] = hsh
->stub_offset
;
2495 htab
->amt_destination_addr
[nr
- 1] = target
;
2503 avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry
*bh
,
2504 void *in_arg ATTRIBUTE_UNUSED
)
2506 struct elf32_avr_stub_hash_entry
*hsh
;
2508 hsh
= avr_stub_hash_entry (bh
);
2509 hsh
->is_actually_needed
= FALSE
;
2515 avr_size_one_stub (struct bfd_hash_entry
*bh
, void *in_arg
)
2517 struct elf32_avr_stub_hash_entry
*hsh
;
2518 struct elf32_avr_link_hash_table
*htab
;
2521 /* Massage our args to the form they really have. */
2522 hsh
= avr_stub_hash_entry (bh
);
2525 if (hsh
->is_actually_needed
)
2530 htab
->stub_sec
->size
+= size
;
2535 elf32_avr_setup_params (struct bfd_link_info
*info
,
2537 asection
*avr_stub_section
,
2538 bfd_boolean no_stubs
,
2539 bfd_boolean deb_stubs
,
2540 bfd_boolean deb_relax
,
2541 bfd_vma pc_wrap_around
,
2542 bfd_boolean call_ret_replacement
)
2544 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
2548 htab
->stub_sec
= avr_stub_section
;
2549 htab
->stub_bfd
= avr_stub_bfd
;
2550 htab
->no_stubs
= no_stubs
;
2552 debug_relax
= deb_relax
;
2553 debug_stubs
= deb_stubs
;
2554 avr_pc_wrap_around
= pc_wrap_around
;
2555 avr_replace_call_ret_sequences
= call_ret_replacement
;
2559 /* Set up various things so that we can make a list of input sections
2560 for each output section included in the link. Returns -1 on error,
2561 0 when no stubs will be needed, and 1 on success. It also sets
2562 information on the stubs bfd and the stub section in the info
2566 elf32_avr_setup_section_lists (bfd
*output_bfd
,
2567 struct bfd_link_info
*info
)
2570 unsigned int bfd_count
;
2571 int top_id
, top_index
;
2573 asection
**input_list
, **list
;
2575 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
2577 if (htab
== NULL
|| htab
->no_stubs
)
2580 /* Count the number of input BFDs and find the top input section id. */
2581 for (input_bfd
= info
->input_bfds
, bfd_count
= 0, top_id
= 0;
2583 input_bfd
= input_bfd
->link_next
)
2586 for (section
= input_bfd
->sections
;
2588 section
= section
->next
)
2589 if (top_id
< section
->id
)
2590 top_id
= section
->id
;
2593 htab
->bfd_count
= bfd_count
;
2595 /* We can't use output_bfd->section_count here to find the top output
2596 section index as some sections may have been removed, and
2597 strip_excluded_output_sections doesn't renumber the indices. */
2598 for (section
= output_bfd
->sections
, top_index
= 0;
2600 section
= section
->next
)
2601 if (top_index
< section
->index
)
2602 top_index
= section
->index
;
2604 htab
->top_index
= top_index
;
2605 amt
= sizeof (asection
*) * (top_index
+ 1);
2606 input_list
= bfd_malloc (amt
);
2607 htab
->input_list
= input_list
;
2608 if (input_list
== NULL
)
2611 /* For sections we aren't interested in, mark their entries with a
2612 value we can check later. */
2613 list
= input_list
+ top_index
;
2615 *list
= bfd_abs_section_ptr
;
2616 while (list
-- != input_list
);
2618 for (section
= output_bfd
->sections
;
2620 section
= section
->next
)
2621 if ((section
->flags
& SEC_CODE
) != 0)
2622 input_list
[section
->index
] = NULL
;
2628 /* Read in all local syms for all input bfds, and create hash entries
2629 for export stubs if we are building a multi-subspace shared lib.
2630 Returns -1 on error, 0 otherwise. */
2633 get_local_syms (bfd
*input_bfd
, struct bfd_link_info
*info
)
2635 unsigned int bfd_indx
;
2636 Elf_Internal_Sym
*local_syms
, **all_local_syms
;
2637 struct elf32_avr_link_hash_table
*htab
= avr_link_hash_table (info
);
2643 /* We want to read in symbol extension records only once. To do this
2644 we need to read in the local symbols in parallel and save them for
2645 later use; so hold pointers to the local symbols in an array. */
2646 amt
= sizeof (Elf_Internal_Sym
*) * htab
->bfd_count
;
2647 all_local_syms
= bfd_zmalloc (amt
);
2648 htab
->all_local_syms
= all_local_syms
;
2649 if (all_local_syms
== NULL
)
2652 /* Walk over all the input BFDs, swapping in local symbols.
2653 If we are creating a shared library, create hash entries for the
2657 input_bfd
= input_bfd
->link_next
, bfd_indx
++)
2659 Elf_Internal_Shdr
*symtab_hdr
;
2661 /* We'll need the symbol table in a second. */
2662 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2663 if (symtab_hdr
->sh_info
== 0)
2666 /* We need an array of the local symbols attached to the input bfd. */
2667 local_syms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
2668 if (local_syms
== NULL
)
2670 local_syms
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
,
2671 symtab_hdr
->sh_info
, 0,
2673 /* Cache them for elf_link_input_bfd. */
2674 symtab_hdr
->contents
= (unsigned char *) local_syms
;
2676 if (local_syms
== NULL
)
2679 all_local_syms
[bfd_indx
] = local_syms
;
2685 #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
2688 elf32_avr_size_stubs (bfd
*output_bfd
,
2689 struct bfd_link_info
*info
,
2690 bfd_boolean is_prealloc_run
)
2692 struct elf32_avr_link_hash_table
*htab
;
2693 int stub_changed
= 0;
2695 htab
= avr_link_hash_table (info
);
2699 /* At this point we initialize htab->vector_base
2700 To the start of the text output section. */
2701 htab
->vector_base
= htab
->stub_sec
->output_section
->vma
;
2703 if (get_local_syms (info
->input_bfds
, info
))
2705 if (htab
->all_local_syms
)
2706 goto error_ret_free_local
;
2710 if (ADD_DUMMY_STUBS_FOR_DEBUGGING
)
2712 struct elf32_avr_stub_hash_entry
*test
;
2714 test
= avr_add_stub ("Hugo",htab
);
2715 test
->target_value
= 0x123456;
2716 test
->stub_offset
= 13;
2718 test
= avr_add_stub ("Hugo2",htab
);
2719 test
->target_value
= 0x84210;
2720 test
->stub_offset
= 14;
2726 unsigned int bfd_indx
;
2728 /* We will have to re-generate the stub hash table each time anything
2729 in memory has changed. */
2731 bfd_hash_traverse (&htab
->bstab
, avr_mark_stub_not_to_be_necessary
, htab
);
2732 for (input_bfd
= info
->input_bfds
, bfd_indx
= 0;
2734 input_bfd
= input_bfd
->link_next
, bfd_indx
++)
2736 Elf_Internal_Shdr
*symtab_hdr
;
2738 Elf_Internal_Sym
*local_syms
;
2740 /* We'll need the symbol table in a second. */
2741 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2742 if (symtab_hdr
->sh_info
== 0)
2745 local_syms
= htab
->all_local_syms
[bfd_indx
];
2747 /* Walk over each section attached to the input bfd. */
2748 for (section
= input_bfd
->sections
;
2750 section
= section
->next
)
2752 Elf_Internal_Rela
*internal_relocs
, *irelaend
, *irela
;
2754 /* If there aren't any relocs, then there's nothing more
2756 if ((section
->flags
& SEC_RELOC
) == 0
2757 || section
->reloc_count
== 0)
2760 /* If this section is a link-once section that will be
2761 discarded, then don't create any stubs. */
2762 if (section
->output_section
== NULL
2763 || section
->output_section
->owner
!= output_bfd
)
2766 /* Get the relocs. */
2768 = _bfd_elf_link_read_relocs (input_bfd
, section
, NULL
, NULL
,
2770 if (internal_relocs
== NULL
)
2771 goto error_ret_free_local
;
2773 /* Now examine each relocation. */
2774 irela
= internal_relocs
;
2775 irelaend
= irela
+ section
->reloc_count
;
2776 for (; irela
< irelaend
; irela
++)
2778 unsigned int r_type
, r_indx
;
2779 struct elf32_avr_stub_hash_entry
*hsh
;
2782 bfd_vma destination
;
2783 struct elf_link_hash_entry
*hh
;
2786 r_type
= ELF32_R_TYPE (irela
->r_info
);
2787 r_indx
= ELF32_R_SYM (irela
->r_info
);
2789 /* Only look for 16 bit GS relocs. No other reloc will need a
2791 if (!((r_type
== R_AVR_16_PM
)
2792 || (r_type
== R_AVR_LO8_LDI_GS
)
2793 || (r_type
== R_AVR_HI8_LDI_GS
)))
2796 /* Now determine the call target, its name, value,
2802 if (r_indx
< symtab_hdr
->sh_info
)
2804 /* It's a local symbol. */
2805 Elf_Internal_Sym
*sym
;
2806 Elf_Internal_Shdr
*hdr
;
2809 sym
= local_syms
+ r_indx
;
2810 if (ELF_ST_TYPE (sym
->st_info
) != STT_SECTION
)
2811 sym_value
= sym
->st_value
;
2812 shndx
= sym
->st_shndx
;
2813 if (shndx
< elf_numsections (input_bfd
))
2815 hdr
= elf_elfsections (input_bfd
)[shndx
];
2816 sym_sec
= hdr
->bfd_section
;
2817 destination
= (sym_value
+ irela
->r_addend
2818 + sym_sec
->output_offset
2819 + sym_sec
->output_section
->vma
);
2824 /* It's an external symbol. */
2827 e_indx
= r_indx
- symtab_hdr
->sh_info
;
2828 hh
= elf_sym_hashes (input_bfd
)[e_indx
];
2830 while (hh
->root
.type
== bfd_link_hash_indirect
2831 || hh
->root
.type
== bfd_link_hash_warning
)
2832 hh
= (struct elf_link_hash_entry
*)
2833 (hh
->root
.u
.i
.link
);
2835 if (hh
->root
.type
== bfd_link_hash_defined
2836 || hh
->root
.type
== bfd_link_hash_defweak
)
2838 sym_sec
= hh
->root
.u
.def
.section
;
2839 sym_value
= hh
->root
.u
.def
.value
;
2840 if (sym_sec
->output_section
!= NULL
)
2841 destination
= (sym_value
+ irela
->r_addend
2842 + sym_sec
->output_offset
2843 + sym_sec
->output_section
->vma
);
2845 else if (hh
->root
.type
== bfd_link_hash_undefweak
)
2850 else if (hh
->root
.type
== bfd_link_hash_undefined
)
2852 if (! (info
->unresolved_syms_in_objects
== RM_IGNORE
2853 && (ELF_ST_VISIBILITY (hh
->other
)
2859 bfd_set_error (bfd_error_bad_value
);
2861 error_ret_free_internal
:
2862 if (elf_section_data (section
)->relocs
== NULL
)
2863 free (internal_relocs
);
2864 goto error_ret_free_local
;
2868 if (! avr_stub_is_required_for_16_bit_reloc
2869 (destination
- htab
->vector_base
))
2871 if (!is_prealloc_run
)
2872 /* We are having a reloc that does't need a stub. */
2875 /* We don't right now know if a stub will be needed.
2876 Let's rather be on the safe side. */
2879 /* Get the name of this stub. */
2880 stub_name
= avr_stub_name (sym_sec
, sym_value
, irela
);
2883 goto error_ret_free_internal
;
2886 hsh
= avr_stub_hash_lookup (&htab
->bstab
,
2891 /* The proper stub has already been created. Mark it
2892 to be used and write the possibly changed destination
2894 hsh
->is_actually_needed
= TRUE
;
2895 hsh
->target_value
= destination
;
2900 hsh
= avr_add_stub (stub_name
, htab
);
2904 goto error_ret_free_internal
;
2907 hsh
->is_actually_needed
= TRUE
;
2908 hsh
->target_value
= destination
;
2911 printf ("Adding stub with destination 0x%x to the"
2912 " hash table.\n", (unsigned int) destination
);
2914 printf ("(Pre-Alloc run: %i)\n", is_prealloc_run
);
2916 stub_changed
= TRUE
;
2919 /* We're done with the internal relocs, free them. */
2920 if (elf_section_data (section
)->relocs
== NULL
)
2921 free (internal_relocs
);
2925 /* Re-Calculate the number of needed stubs. */
2926 htab
->stub_sec
->size
= 0;
2927 bfd_hash_traverse (&htab
->bstab
, avr_size_one_stub
, htab
);
2932 stub_changed
= FALSE
;
2935 free (htab
->all_local_syms
);
2938 error_ret_free_local
:
2939 free (htab
->all_local_syms
);
2944 /* Build all the stubs associated with the current output file. The
2945 stubs are kept in a hash table attached to the main linker hash
2946 table. We also set up the .plt entries for statically linked PIC
2947 functions here. This function is called via hppaelf_finish in the
2951 elf32_avr_build_stubs (struct bfd_link_info
*info
)
2954 struct bfd_hash_table
*table
;
2955 struct elf32_avr_link_hash_table
*htab
;
2956 bfd_size_type total_size
= 0;
2958 htab
= avr_link_hash_table (info
);
2962 /* In case that there were several stub sections: */
2963 for (stub_sec
= htab
->stub_bfd
->sections
;
2965 stub_sec
= stub_sec
->next
)
2969 /* Allocate memory to hold the linker stubs. */
2970 size
= stub_sec
->size
;
2973 stub_sec
->contents
= bfd_zalloc (htab
->stub_bfd
, size
);
2974 if (stub_sec
->contents
== NULL
&& size
!= 0)
2979 /* Allocate memory for the adress mapping table. */
2980 htab
->amt_entry_cnt
= 0;
2981 htab
->amt_max_entry_cnt
= total_size
/ 4;
2982 htab
->amt_stub_offsets
= bfd_malloc (sizeof (bfd_vma
)
2983 * htab
->amt_max_entry_cnt
);
2984 htab
->amt_destination_addr
= bfd_malloc (sizeof (bfd_vma
)
2985 * htab
->amt_max_entry_cnt
);
2988 printf ("Allocating %i entries in the AMT\n", htab
->amt_max_entry_cnt
);
2990 /* Build the stubs as directed by the stub hash table. */
2991 table
= &htab
->bstab
;
2992 bfd_hash_traverse (table
, avr_build_one_stub
, info
);
2995 printf ("Final Stub section Size: %i\n", (int) htab
->stub_sec
->size
);
3000 #define ELF_ARCH bfd_arch_avr
3001 #define ELF_TARGET_ID AVR_ELF_DATA
3002 #define ELF_MACHINE_CODE EM_AVR
3003 #define ELF_MACHINE_ALT1 EM_AVR_OLD
3004 #define ELF_MAXPAGESIZE 1
3006 #define TARGET_LITTLE_SYM bfd_elf32_avr_vec
3007 #define TARGET_LITTLE_NAME "elf32-avr"
3009 #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
3010 #define bfd_elf32_bfd_link_hash_table_free elf32_avr_link_hash_table_free
3012 #define elf_info_to_howto avr_info_to_howto_rela
3013 #define elf_info_to_howto_rel NULL
3014 #define elf_backend_relocate_section elf32_avr_relocate_section
3015 #define elf_backend_can_gc_sections 1
3016 #define elf_backend_rela_normal 1
3017 #define elf_backend_final_write_processing \
3018 bfd_elf_avr_final_write_processing
3019 #define elf_backend_object_p elf32_avr_object_p
3021 #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
3022 #define bfd_elf32_bfd_get_relocated_section_contents \
3023 elf32_avr_get_relocated_section_contents
3025 #include "elf32-target.h"