1 /* Motorola 68HC11-specific support for 32-bit ELF
2 Copyright (C) 1999-2021 Free Software Foundation, Inc.
3 Contributed by Stephane Carrez (stcarrez@nerim.fr)
4 (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
5
6 This file is part of BFD, the Binary File Descriptor library.
7
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.
12
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.
17
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, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf32-m68hc1x.h"
29 #include "elf/m68hc11.h"
30 #include "opcode/m68hc11.h"
31
32 /* Relocation functions. */
33 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
34 (bfd *, bfd_reloc_code_real_type);
35 static bool m68hc11_info_to_howto_rel
36 (bfd *, arelent *, Elf_Internal_Rela *);
37
38 /* Trampoline generation. */
39 static bool m68hc11_elf_size_one_stub
40 (struct bfd_hash_entry *gen_entry, void *in_arg);
41 static bool m68hc11_elf_build_one_stub
42 (struct bfd_hash_entry *gen_entry, void *in_arg);
43 static struct bfd_link_hash_table* m68hc11_elf_bfd_link_hash_table_create
44 (bfd* abfd);
45
46 /* Linker relaxation. */
47 static bool m68hc11_elf_relax_section
48 (bfd *, asection *, struct bfd_link_info *, bool *);
49 static void m68hc11_elf_relax_delete_bytes
50 (bfd *, asection *, bfd_vma, int);
51 static void m68hc11_relax_group
52 (bfd *, asection *, bfd_byte *, unsigned, unsigned long, unsigned long);
53 static int compare_reloc (const void *, const void *);
54
55 /* Use REL instead of RELA to save space */
56 #define USE_REL 1
57
58 /* The Motorola 68HC11 microcontroller only addresses 64Kb but we also
59 support a memory bank switching mechanism similar to 68HC12.
60 We must handle 8 and 16-bit relocations. The 32-bit relocation
61 are used for debugging sections (DWARF2) to represent a virtual
62 address.
63 The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
64 static reloc_howto_type elf_m68hc11_howto_table[] = {
65 /* This reloc does nothing. */
66 HOWTO (R_M68HC11_NONE, /* type */
67 0, /* rightshift */
68 3, /* size (0 = byte, 1 = short, 2 = long) */
69 0, /* bitsize */
70 false, /* pc_relative */
71 0, /* bitpos */
72 complain_overflow_dont,/* complain_on_overflow */
73 bfd_elf_generic_reloc, /* special_function */
74 "R_M68HC11_NONE", /* name */
75 false, /* partial_inplace */
76 0, /* src_mask */
77 0, /* dst_mask */
78 false), /* pcrel_offset */
79
80 /* A 8 bit absolute relocation */
81 HOWTO (R_M68HC11_8, /* type */
82 0, /* rightshift */
83 0, /* size (0 = byte, 1 = short, 2 = long) */
84 8, /* bitsize */
85 false, /* pc_relative */
86 0, /* bitpos */
87 complain_overflow_bitfield, /* complain_on_overflow */
88 bfd_elf_generic_reloc, /* special_function */
89 "R_M68HC11_8", /* name */
90 false, /* partial_inplace */
91 0x00ff, /* src_mask */
92 0x00ff, /* dst_mask */
93 false), /* pcrel_offset */
94
95 /* A 8 bit absolute relocation (upper address) */
96 HOWTO (R_M68HC11_HI8, /* type */
97 8, /* rightshift */
98 0, /* size (0 = byte, 1 = short, 2 = long) */
99 8, /* bitsize */
100 false, /* pc_relative */
101 0, /* bitpos */
102 complain_overflow_bitfield, /* complain_on_overflow */
103 bfd_elf_generic_reloc, /* special_function */
104 "R_M68HC11_HI8", /* name */
105 false, /* partial_inplace */
106 0x00ff, /* src_mask */
107 0x00ff, /* dst_mask */
108 false), /* pcrel_offset */
109
110 /* A 8 bit absolute relocation (upper address) */
111 HOWTO (R_M68HC11_LO8, /* type */
112 0, /* rightshift */
113 0, /* size (0 = byte, 1 = short, 2 = long) */
114 8, /* bitsize */
115 false, /* pc_relative */
116 0, /* bitpos */
117 complain_overflow_dont, /* complain_on_overflow */
118 bfd_elf_generic_reloc, /* special_function */
119 "R_M68HC11_LO8", /* name */
120 false, /* partial_inplace */
121 0x00ff, /* src_mask */
122 0x00ff, /* dst_mask */
123 false), /* pcrel_offset */
124
125 /* A 8 bit PC-rel relocation */
126 HOWTO (R_M68HC11_PCREL_8, /* type */
127 0, /* rightshift */
128 0, /* size (0 = byte, 1 = short, 2 = long) */
129 8, /* bitsize */
130 true, /* pc_relative */
131 0, /* bitpos */
132 complain_overflow_bitfield, /* complain_on_overflow */
133 bfd_elf_generic_reloc, /* special_function */
134 "R_M68HC11_PCREL_8", /* name */
135 false, /* partial_inplace */
136 0x00ff, /* src_mask */
137 0x00ff, /* dst_mask */
138 true), /* pcrel_offset */
139
140 /* A 16 bit absolute relocation */
141 HOWTO (R_M68HC11_16, /* type */
142 0, /* rightshift */
143 1, /* size (0 = byte, 1 = short, 2 = long) */
144 16, /* bitsize */
145 false, /* pc_relative */
146 0, /* bitpos */
147 complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
148 bfd_elf_generic_reloc, /* special_function */
149 "R_M68HC11_16", /* name */
150 false, /* partial_inplace */
151 0xffff, /* src_mask */
152 0xffff, /* dst_mask */
153 false), /* pcrel_offset */
154
155 /* A 32 bit absolute relocation. This one is never used for the
156 code relocation. It's used by gas for -gstabs generation. */
157 HOWTO (R_M68HC11_32, /* type */
158 0, /* rightshift */
159 2, /* size (0 = byte, 1 = short, 2 = long) */
160 32, /* bitsize */
161 false, /* pc_relative */
162 0, /* bitpos */
163 complain_overflow_bitfield, /* complain_on_overflow */
164 bfd_elf_generic_reloc, /* special_function */
165 "R_M68HC11_32", /* name */
166 false, /* partial_inplace */
167 0xffffffff, /* src_mask */
168 0xffffffff, /* dst_mask */
169 false), /* pcrel_offset */
170
171 /* A 3 bit absolute relocation */
172 HOWTO (R_M68HC11_3B, /* type */
173 0, /* rightshift */
174 0, /* size (0 = byte, 1 = short, 2 = long) */
175 3, /* bitsize */
176 false, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_bitfield, /* complain_on_overflow */
179 bfd_elf_generic_reloc, /* special_function */
180 "R_M68HC11_4B", /* name */
181 false, /* partial_inplace */
182 0x003, /* src_mask */
183 0x003, /* dst_mask */
184 false), /* pcrel_offset */
185
186 /* A 16 bit PC-rel relocation */
187 HOWTO (R_M68HC11_PCREL_16, /* type */
188 0, /* rightshift */
189 1, /* size (0 = byte, 1 = short, 2 = long) */
190 16, /* bitsize */
191 true, /* pc_relative */
192 0, /* bitpos */
193 complain_overflow_dont, /* complain_on_overflow */
194 bfd_elf_generic_reloc, /* special_function */
195 "R_M68HC11_PCREL_16", /* name */
196 false, /* partial_inplace */
197 0xffff, /* src_mask */
198 0xffff, /* dst_mask */
199 true), /* pcrel_offset */
200
201 /* GNU extension to record C++ vtable hierarchy */
202 HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
203 0, /* rightshift */
204 1, /* size (0 = byte, 1 = short, 2 = long) */
205 0, /* bitsize */
206 false, /* pc_relative */
207 0, /* bitpos */
208 complain_overflow_dont, /* complain_on_overflow */
209 NULL, /* special_function */
210 "R_M68HC11_GNU_VTINHERIT", /* name */
211 false, /* partial_inplace */
212 0, /* src_mask */
213 0, /* dst_mask */
214 false), /* pcrel_offset */
215
216 /* GNU extension to record C++ vtable member usage */
217 HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
218 0, /* rightshift */
219 1, /* size (0 = byte, 1 = short, 2 = long) */
220 0, /* bitsize */
221 false, /* pc_relative */
222 0, /* bitpos */
223 complain_overflow_dont, /* complain_on_overflow */
224 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
225 "R_M68HC11_GNU_VTENTRY", /* name */
226 false, /* partial_inplace */
227 0, /* src_mask */
228 0, /* dst_mask */
229 false), /* pcrel_offset */
230
231 /* A 24 bit relocation */
232 HOWTO (R_M68HC11_24, /* type */
233 0, /* rightshift */
234 1, /* size (0 = byte, 1 = short, 2 = long) */
235 24, /* bitsize */
236 false, /* pc_relative */
237 0, /* bitpos */
238 complain_overflow_bitfield, /* complain_on_overflow */
239 bfd_elf_generic_reloc, /* special_function */
240 "R_M68HC11_24", /* name */
241 false, /* partial_inplace */
242 0xffffff, /* src_mask */
243 0xffffff, /* dst_mask */
244 false), /* pcrel_offset */
245
246 /* A 16-bit low relocation */
247 HOWTO (R_M68HC11_LO16, /* type */
248 0, /* rightshift */
249 1, /* size (0 = byte, 1 = short, 2 = long) */
250 16, /* bitsize */
251 false, /* pc_relative */
252 0, /* bitpos */
253 complain_overflow_bitfield, /* complain_on_overflow */
254 bfd_elf_generic_reloc, /* special_function */
255 "R_M68HC11_LO16", /* name */
256 false, /* partial_inplace */
257 0xffff, /* src_mask */
258 0xffff, /* dst_mask */
259 false), /* pcrel_offset */
260
261 /* A page relocation */
262 HOWTO (R_M68HC11_PAGE, /* type */
263 0, /* rightshift */
264 0, /* size (0 = byte, 1 = short, 2 = long) */
265 8, /* bitsize */
266 false, /* pc_relative */
267 0, /* bitpos */
268 complain_overflow_bitfield, /* complain_on_overflow */
269 bfd_elf_generic_reloc, /* special_function */
270 "R_M68HC11_PAGE", /* name */
271 false, /* partial_inplace */
272 0x00ff, /* src_mask */
273 0x00ff, /* dst_mask */
274 false), /* pcrel_offset */
275
276 EMPTY_HOWTO (14),
277 EMPTY_HOWTO (15),
278 EMPTY_HOWTO (16),
279 EMPTY_HOWTO (17),
280 EMPTY_HOWTO (18),
281 EMPTY_HOWTO (19),
282
283 /* Mark beginning of a jump instruction (any form). */
284 HOWTO (R_M68HC11_RL_JUMP, /* type */
285 0, /* rightshift */
286 1, /* size (0 = byte, 1 = short, 2 = long) */
287 0, /* bitsize */
288 false, /* pc_relative */
289 0, /* bitpos */
290 complain_overflow_dont, /* complain_on_overflow */
291 m68hc11_elf_ignore_reloc, /* special_function */
292 "R_M68HC11_RL_JUMP", /* name */
293 true, /* partial_inplace */
294 0, /* src_mask */
295 0, /* dst_mask */
296 true), /* pcrel_offset */
297
298 /* Mark beginning of Gcc relaxation group instruction. */
299 HOWTO (R_M68HC11_RL_GROUP, /* type */
300 0, /* rightshift */
301 1, /* size (0 = byte, 1 = short, 2 = long) */
302 0, /* bitsize */
303 false, /* pc_relative */
304 0, /* bitpos */
305 complain_overflow_dont, /* complain_on_overflow */
306 m68hc11_elf_ignore_reloc, /* special_function */
307 "R_M68HC11_RL_GROUP", /* name */
308 true, /* partial_inplace */
309 0, /* src_mask */
310 0, /* dst_mask */
311 true), /* pcrel_offset */
312 };
313
314 /* Map BFD reloc types to M68HC11 ELF reloc types. */
315
316 struct m68hc11_reloc_map
317 {
318 bfd_reloc_code_real_type bfd_reloc_val;
319 unsigned char elf_reloc_val;
320 };
321
322 static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
323 {BFD_RELOC_NONE, R_M68HC11_NONE,},
324 {BFD_RELOC_8, R_M68HC11_8},
325 {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
326 {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
327 {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
328 {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
329 {BFD_RELOC_16, R_M68HC11_16},
330 {BFD_RELOC_32, R_M68HC11_32},
331 {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
332
333 {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
334 {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
335
336 {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
337 {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
338 {BFD_RELOC_M68HC11_24, R_M68HC11_24},
339
340 {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
341 {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
342 };
343
344 static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)345 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
346 bfd_reloc_code_real_type code)
347 {
348 unsigned int i;
349
350 for (i = 0;
351 i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
352 i++)
353 {
354 if (m68hc11_reloc_map[i].bfd_reloc_val == code)
355 return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
356 }
357
358 return NULL;
359 }
360
361 static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)362 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
363 const char *r_name)
364 {
365 unsigned int i;
366
367 for (i = 0;
368 i < (sizeof (elf_m68hc11_howto_table)
369 / sizeof (elf_m68hc11_howto_table[0]));
370 i++)
371 if (elf_m68hc11_howto_table[i].name != NULL
372 && strcasecmp (elf_m68hc11_howto_table[i].name, r_name) == 0)
373 return &elf_m68hc11_howto_table[i];
374
375 return NULL;
376 }
377
378 /* Set the howto pointer for an M68HC11 ELF reloc. */
379
380 static bool
m68hc11_info_to_howto_rel(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)381 m68hc11_info_to_howto_rel (bfd *abfd,
382 arelent *cache_ptr, Elf_Internal_Rela *dst)
383 {
384 unsigned int r_type;
385
386 r_type = ELF32_R_TYPE (dst->r_info);
387 if (r_type >= (unsigned int) R_M68HC11_max)
388 {
389 /* xgettext:c-format */
390 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
391 abfd, r_type);
392 bfd_set_error (bfd_error_bad_value);
393 return false;
394 }
395 cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
396 return true;
397 }
398
399
400 /* Far trampoline generation. */
401
402 /* Build a 68HC11 trampoline stub. */
403 static bool
m68hc11_elf_build_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)404 m68hc11_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
405 {
406 struct elf32_m68hc11_stub_hash_entry *stub_entry;
407 struct bfd_link_info *info;
408 struct m68hc11_elf_link_hash_table *htab;
409 asection *stub_sec;
410 bfd *stub_bfd;
411 bfd_byte *loc;
412 bfd_vma sym_value, phys_page, phys_addr;
413
414 /* Massage our args to the form they really have. */
415 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
416 info = (struct bfd_link_info *) in_arg;
417
418 /* Fail if the target section could not be assigned to an output
419 section. The user should fix his linker script. */
420 if (stub_entry->target_section->output_section == NULL
421 && info->non_contiguous_regions)
422 info->callbacks->einfo (_("%F%P: Could not assign '%pA' to an output section. "
423 "Retry without --enable-non-contiguous-regions.\n"),
424 stub_entry->target_section);
425
426 htab = m68hc11_elf_hash_table (info);
427 if (htab == NULL)
428 return false;
429
430 stub_sec = stub_entry->stub_sec;
431
432 /* Make a note of the offset within the stubs for this entry. */
433 stub_entry->stub_offset = stub_sec->size;
434 stub_sec->size += 10;
435 loc = stub_sec->contents + stub_entry->stub_offset;
436
437 stub_bfd = stub_sec->owner;
438
439 /* Create the trampoline call stub:
440
441 pshb
442 ldab #%page(symbol)
443 ldy #%addr(symbol)
444 jmp __trampoline
445
446 */
447 sym_value = (stub_entry->target_value
448 + stub_entry->target_section->output_offset
449 + stub_entry->target_section->output_section->vma);
450 phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
451 phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
452
453 /* pshb; ldab #%page(sym) */
454 bfd_put_8 (stub_bfd, 0x37, loc);
455 bfd_put_8 (stub_bfd, 0xC6, loc + 1);
456 bfd_put_8 (stub_bfd, phys_page, loc + 2);
457 loc += 3;
458
459 /* ldy #%addr(sym) */
460 bfd_put_8 (stub_bfd, 0x18, loc);
461 bfd_put_8 (stub_bfd, 0xCE, loc + 1);
462 bfd_put_16 (stub_bfd, phys_addr, loc + 2);
463 loc += 4;
464
465 /* jmp __trampoline */
466 bfd_put_8 (stub_bfd, 0x7E, loc);
467 bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
468
469 return true;
470 }
471
472 /* As above, but don't actually build the stub. Just bump offset so
473 we know stub section sizes. */
474
475 static bool
m68hc11_elf_size_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg ATTRIBUTE_UNUSED)476 m68hc11_elf_size_one_stub (struct bfd_hash_entry *gen_entry,
477 void *in_arg ATTRIBUTE_UNUSED)
478 {
479 struct elf32_m68hc11_stub_hash_entry *stub_entry;
480
481 /* Massage our args to the form they really have. */
482 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
483
484 stub_entry->stub_sec->size += 10;
485 return true;
486 }
487
488 /* Create a 68HC11 ELF linker hash table. */
489
490 static struct bfd_link_hash_table *
m68hc11_elf_bfd_link_hash_table_create(bfd * abfd)491 m68hc11_elf_bfd_link_hash_table_create (bfd *abfd)
492 {
493 struct m68hc11_elf_link_hash_table *ret;
494
495 ret = m68hc11_elf_hash_table_create (abfd);
496 if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
497 return NULL;
498
499 ret->size_one_stub = m68hc11_elf_size_one_stub;
500 ret->build_one_stub = m68hc11_elf_build_one_stub;
501
502 return &ret->root.root;
503 }
504
505
506 /* 68HC11 Linker Relaxation. */
507
508 const struct m68hc11_direct_relax
509 {
510 const char *name;
511 unsigned char code;
512 unsigned char direct_code;
513 } m68hc11_direct_relax_table[] = {
514 { "adca", 0xB9, 0x99 },
515 { "adcb", 0xF9, 0xD9 },
516 { "adda", 0xBB, 0x9B },
517 { "addb", 0xFB, 0xDB },
518 { "addd", 0xF3, 0xD3 },
519 { "anda", 0xB4, 0x94 },
520 { "andb", 0xF4, 0xD4 },
521 { "cmpa", 0xB1, 0x91 },
522 { "cmpb", 0xF1, 0xD1 },
523 { "cpd", 0xB3, 0x93 },
524 { "cpxy", 0xBC, 0x9C },
525 /* { "cpy", 0xBC, 0x9C }, */
526 { "eora", 0xB8, 0x98 },
527 { "eorb", 0xF8, 0xD8 },
528 { "jsr", 0xBD, 0x9D },
529 { "ldaa", 0xB6, 0x96 },
530 { "ldab", 0xF6, 0xD6 },
531 { "ldd", 0xFC, 0xDC },
532 { "lds", 0xBE, 0x9E },
533 { "ldxy", 0xFE, 0xDE },
534 /* { "ldy", 0xFE, 0xDE },*/
535 { "oraa", 0xBA, 0x9A },
536 { "orab", 0xFA, 0xDA },
537 { "sbca", 0xB2, 0x92 },
538 { "sbcb", 0xF2, 0xD2 },
539 { "staa", 0xB7, 0x97 },
540 { "stab", 0xF7, 0xD7 },
541 { "std", 0xFD, 0xDD },
542 { "sts", 0xBF, 0x9F },
543 { "stxy", 0xFF, 0xDF },
544 /* { "sty", 0xFF, 0xDF },*/
545 { "suba", 0xB0, 0x90 },
546 { "subb", 0xF0, 0xD0 },
547 { "subd", 0xB3, 0x93 },
548 { 0, 0, 0 }
549 };
550
551 static const struct m68hc11_direct_relax *
find_relaxable_insn(unsigned char code)552 find_relaxable_insn (unsigned char code)
553 {
554 int i;
555
556 for (i = 0; m68hc11_direct_relax_table[i].name; i++)
557 if (m68hc11_direct_relax_table[i].code == code)
558 return &m68hc11_direct_relax_table[i];
559
560 return 0;
561 }
562
563 static int
compare_reloc(const void * e1,const void * e2)564 compare_reloc (const void *e1, const void *e2)
565 {
566 const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
567 const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
568
569 if (i1->r_offset == i2->r_offset)
570 return 0;
571 else
572 return i1->r_offset < i2->r_offset ? -1 : 1;
573 }
574
575 #define M6811_OP_LDX_IMMEDIATE (0xCE)
576
577 static void
m68hc11_relax_group(bfd * abfd,asection * sec,bfd_byte * contents,unsigned value,unsigned long offset,unsigned long end_group)578 m68hc11_relax_group (bfd *abfd, asection *sec, bfd_byte *contents,
579 unsigned value, unsigned long offset,
580 unsigned long end_group)
581 {
582 unsigned char code;
583 unsigned long start_offset;
584 unsigned long ldx_offset = offset;
585 unsigned long ldx_size;
586 int can_delete_ldx;
587 int relax_ldy = 0;
588
589 /* First instruction of the relax group must be a
590 LDX #value or LDY #value. If this is not the case,
591 ignore the relax group. */
592 code = bfd_get_8 (abfd, contents + offset);
593 if (code == 0x18)
594 {
595 relax_ldy++;
596 offset++;
597 code = bfd_get_8 (abfd, contents + offset);
598 }
599 ldx_size = offset - ldx_offset + 3;
600 offset += 3;
601 if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group)
602 return;
603
604
605 /* We can remove the LDX/LDY only when all bset/brclr instructions
606 of the relax group have been converted to use direct addressing
607 mode. */
608 can_delete_ldx = 1;
609 while (offset < end_group)
610 {
611 unsigned isize;
612 unsigned new_value;
613 int bset_use_y;
614
615 bset_use_y = 0;
616 start_offset = offset;
617 code = bfd_get_8 (abfd, contents + offset);
618 if (code == 0x18)
619 {
620 bset_use_y++;
621 offset++;
622 code = bfd_get_8 (abfd, contents + offset);
623 }
624
625 /* Check the instruction and translate to use direct addressing mode. */
626 switch (code)
627 {
628 /* bset */
629 case 0x1C:
630 code = 0x14;
631 isize = 3;
632 break;
633
634 /* brclr */
635 case 0x1F:
636 code = 0x13;
637 isize = 4;
638 break;
639
640 /* brset */
641 case 0x1E:
642 code = 0x12;
643 isize = 4;
644 break;
645
646 /* bclr */
647 case 0x1D:
648 code = 0x15;
649 isize = 3;
650 break;
651
652 /* This instruction is not recognized and we are not
653 at end of the relax group. Ignore and don't remove
654 the first LDX (we don't know what it is used for...). */
655 default:
656 return;
657 }
658 new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1);
659 new_value += value;
660 if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy)
661 {
662 bfd_put_8 (abfd, code, contents + offset);
663 bfd_put_8 (abfd, new_value, contents + offset + 1);
664 if (start_offset != offset)
665 {
666 m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset,
667 offset - start_offset);
668 end_group--;
669 }
670 }
671 else
672 {
673 can_delete_ldx = 0;
674 }
675 offset = start_offset + isize;
676 }
677 if (can_delete_ldx)
678 {
679 /* Remove the move instruction (3 or 4 bytes win). */
680 m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size);
681 }
682 }
683
684 /* This function handles relaxing for the 68HC11.
685
686
687 and somewhat more difficult to support. */
688
689 static bool
m68hc11_elf_relax_section(bfd * abfd,asection * sec,struct bfd_link_info * link_info,bool * again)690 m68hc11_elf_relax_section (bfd *abfd, asection *sec,
691 struct bfd_link_info *link_info, bool *again)
692 {
693 Elf_Internal_Shdr *symtab_hdr;
694 Elf_Internal_Rela *internal_relocs;
695 Elf_Internal_Rela *free_relocs = NULL;
696 Elf_Internal_Rela *irel, *irelend;
697 bfd_byte *contents = NULL;
698 bfd_byte *free_contents = NULL;
699 Elf32_External_Sym *free_extsyms = NULL;
700 Elf_Internal_Rela *prev_insn_branch = NULL;
701 Elf_Internal_Rela *prev_insn_group = NULL;
702 unsigned insn_group_value = 0;
703 Elf_Internal_Sym *isymbuf = NULL;
704
705 /* Assume nothing changes. */
706 *again = false;
707
708 /* We don't have to do anything for a relocatable link, if
709 this section does not have relocs, or if this is not a
710 code section. */
711 if (bfd_link_relocatable (link_info)
712 || (sec->flags & SEC_RELOC) == 0
713 || sec->reloc_count == 0
714 || (sec->flags & SEC_CODE) == 0)
715 return true;
716
717 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
718
719 /* Get a copy of the native relocations. */
720 internal_relocs = (_bfd_elf_link_read_relocs
721 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
722 link_info->keep_memory));
723 if (internal_relocs == NULL)
724 goto error_return;
725 if (! link_info->keep_memory)
726 free_relocs = internal_relocs;
727
728 /* Checking for branch relaxation relies on the relocations to
729 be sorted on 'r_offset'. This is not guaranteed so we must sort. */
730 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
731 compare_reloc);
732
733 /* Walk through them looking for relaxing opportunities. */
734 irelend = internal_relocs + sec->reloc_count;
735 for (irel = internal_relocs; irel < irelend; irel++)
736 {
737 bfd_vma symval;
738 bfd_vma value;
739 Elf_Internal_Sym *isym;
740 asection *sym_sec;
741 int is_far = 0;
742
743 /* If this isn't something that can be relaxed, then ignore
744 this reloc. */
745 if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16
746 && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP
747 && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP)
748 {
749 prev_insn_branch = 0;
750 prev_insn_group = 0;
751 continue;
752 }
753
754 /* Get the section contents if we haven't done so already. */
755 if (contents == NULL)
756 {
757 /* Get cached copy if it exists. */
758 if (elf_section_data (sec)->this_hdr.contents != NULL)
759 contents = elf_section_data (sec)->this_hdr.contents;
760 else
761 {
762 /* Go get them off disk. */
763 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
764 goto error_return;
765 }
766 }
767
768 /* Try to eliminate an unconditional 8 bit pc-relative branch
769 which immediately follows a conditional 8 bit pc-relative
770 branch around the unconditional branch.
771
772 original: new:
773 bCC lab1 bCC' lab2
774 bra lab2
775 lab1: lab1:
776
777 This happens when the bCC can't reach lab2 at assembly time,
778 but due to other relaxations it can reach at link time. */
779 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP)
780 {
781 Elf_Internal_Rela *nrel;
782 unsigned char code;
783 unsigned char roffset;
784
785 prev_insn_branch = 0;
786 prev_insn_group = 0;
787
788 /* Do nothing if this reloc is the last byte in the section. */
789 if (irel->r_offset + 2 >= sec->size)
790 continue;
791
792 /* See if the next instruction is an unconditional pc-relative
793 branch, more often than not this test will fail, so we
794 test it first to speed things up. */
795 code = bfd_get_8 (abfd, contents + irel->r_offset + 2);
796 if (code != 0x7e)
797 continue;
798
799 /* Also make sure the next relocation applies to the next
800 instruction and that it's a pc-relative 8 bit branch. */
801 nrel = irel + 1;
802 if (nrel == irelend
803 || irel->r_offset + 3 != nrel->r_offset
804 || ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16)
805 continue;
806
807 /* Make sure our destination immediately follows the
808 unconditional branch. */
809 roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1);
810 if (roffset != 3)
811 continue;
812
813 prev_insn_branch = irel;
814 prev_insn_group = 0;
815 continue;
816 }
817
818 /* Read this BFD's symbols if we haven't done so already. */
819 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
820 {
821 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
822 if (isymbuf == NULL)
823 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
824 symtab_hdr->sh_info, 0,
825 NULL, NULL, NULL);
826 if (isymbuf == NULL)
827 goto error_return;
828 }
829
830 /* Get the value of the symbol referred to by the reloc. */
831 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
832 {
833 /* A local symbol. */
834 isym = isymbuf + ELF32_R_SYM (irel->r_info);
835 is_far = isym->st_other & STO_M68HC12_FAR;
836 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
837 symval = (isym->st_value
838 + sym_sec->output_section->vma
839 + sym_sec->output_offset);
840 }
841 else
842 {
843 unsigned long indx;
844 struct elf_link_hash_entry *h;
845
846 /* An external symbol. */
847 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
848 h = elf_sym_hashes (abfd)[indx];
849 BFD_ASSERT (h != NULL);
850 if (h->root.type != bfd_link_hash_defined
851 && h->root.type != bfd_link_hash_defweak)
852 {
853 /* This appears to be a reference to an undefined
854 symbol. Just ignore it--it will be caught by the
855 regular reloc processing. */
856 prev_insn_branch = 0;
857 prev_insn_group = 0;
858 continue;
859 }
860
861 is_far = h->other & STO_M68HC12_FAR;
862 isym = 0;
863 sym_sec = h->root.u.def.section;
864 symval = (h->root.u.def.value
865 + sym_sec->output_section->vma
866 + sym_sec->output_offset);
867 }
868
869 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP)
870 {
871 prev_insn_branch = 0;
872 prev_insn_group = 0;
873
874 /* Do nothing if this reloc is the last byte in the section. */
875 if (irel->r_offset == sec->size)
876 continue;
877
878 prev_insn_group = irel;
879 insn_group_value = isym->st_value;
880 continue;
881 }
882
883 /* When we relax some bytes, the size of our section changes.
884 This affects the layout of next input sections that go in our
885 output section. When the symbol is part of another section that
886 will go in the same output section as the current one, it's
887 final address may now be incorrect (too far). We must let the
888 linker re-compute all section offsets before processing this
889 reloc. Code example:
890
891 Initial Final
892 .sect .text section size = 6 section size = 4
893 jmp foo
894 jmp bar
895 .sect .text.foo_bar output_offset = 6 output_offset = 4
896 foo: rts
897 bar: rts
898
899 If we process the reloc now, the jmp bar is replaced by a
900 relative branch to the initial bar address (output_offset 6). */
901 if (*again && sym_sec != sec
902 && sym_sec->output_section == sec->output_section)
903 {
904 prev_insn_group = 0;
905 prev_insn_branch = 0;
906 continue;
907 }
908
909 value = symval;
910 /* Try to turn a far branch to a near branch. */
911 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
912 && prev_insn_branch)
913 {
914 bfd_vma offset;
915 unsigned char code;
916
917 offset = value - (prev_insn_branch->r_offset
918 + sec->output_section->vma
919 + sec->output_offset + 2);
920
921 /* If the offset is still out of -128..+127 range,
922 leave that far branch unchanged. */
923 if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80)
924 {
925 prev_insn_branch = 0;
926 continue;
927 }
928
929 /* Shrink the branch. */
930 code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset);
931 if (code == 0x7e)
932 {
933 code = 0x20;
934 bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
935 bfd_put_8 (abfd, 0xff,
936 contents + prev_insn_branch->r_offset + 1);
937 irel->r_offset = prev_insn_branch->r_offset + 1;
938 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
939 R_M68HC11_PCREL_8);
940 m68hc11_elf_relax_delete_bytes (abfd, sec,
941 irel->r_offset + 1, 1);
942 }
943 else
944 {
945 code ^= 0x1;
946 bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
947 bfd_put_8 (abfd, 0xff,
948 contents + prev_insn_branch->r_offset + 1);
949 irel->r_offset = prev_insn_branch->r_offset + 1;
950 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
951 R_M68HC11_PCREL_8);
952 m68hc11_elf_relax_delete_bytes (abfd, sec,
953 irel->r_offset + 1, 3);
954 }
955 prev_insn_branch = 0;
956 *again = true;
957 }
958
959 /* Try to turn a 16 bit address into a 8 bit page0 address. */
960 else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
961 && (value & 0xff00) == 0)
962 {
963 unsigned char code;
964 unsigned short offset;
965 const struct m68hc11_direct_relax *rinfo;
966
967 prev_insn_branch = 0;
968 offset = bfd_get_16 (abfd, contents + irel->r_offset);
969 offset += value;
970 if ((offset & 0xff00) != 0)
971 {
972 prev_insn_group = 0;
973 continue;
974 }
975
976 if (prev_insn_group)
977 {
978 unsigned long old_sec_size = sec->size;
979
980 /* Note that we've changed the relocation contents, etc. */
981 elf_section_data (sec)->relocs = internal_relocs;
982 free_relocs = NULL;
983
984 elf_section_data (sec)->this_hdr.contents = contents;
985 free_contents = NULL;
986
987 symtab_hdr->contents = (bfd_byte *) isymbuf;
988 free_extsyms = NULL;
989
990 m68hc11_relax_group (abfd, sec, contents, offset,
991 prev_insn_group->r_offset,
992 insn_group_value);
993 irel = prev_insn_group;
994 prev_insn_group = 0;
995 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
996 R_M68HC11_NONE);
997 if (sec->size != old_sec_size)
998 *again = true;
999 continue;
1000 }
1001
1002 /* Get the opcode. */
1003 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1004 rinfo = find_relaxable_insn (code);
1005 if (rinfo == 0)
1006 {
1007 prev_insn_group = 0;
1008 continue;
1009 }
1010
1011 /* Note that we've changed the relocation contents, etc. */
1012 elf_section_data (sec)->relocs = internal_relocs;
1013 free_relocs = NULL;
1014
1015 elf_section_data (sec)->this_hdr.contents = contents;
1016 free_contents = NULL;
1017
1018 symtab_hdr->contents = (bfd_byte *) isymbuf;
1019 free_extsyms = NULL;
1020
1021 /* Fix the opcode. */
1022 /* printf ("A relaxable case : 0x%02x (%s)\n",
1023 code, rinfo->name); */
1024 bfd_put_8 (abfd, rinfo->direct_code,
1025 contents + irel->r_offset - 1);
1026
1027 /* Delete one byte of data (upper byte of address). */
1028 m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1);
1029
1030 /* Fix the relocation's type. */
1031 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1032 R_M68HC11_8);
1033
1034 /* That will change things, so, we should relax again. */
1035 *again = true;
1036 }
1037 else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16 && !is_far)
1038 {
1039 unsigned char code;
1040 bfd_vma offset;
1041
1042 prev_insn_branch = 0;
1043 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1044 if (code == 0x7e || code == 0xbd)
1045 {
1046 offset = value - (irel->r_offset
1047 + sec->output_section->vma
1048 + sec->output_offset + 1);
1049 offset += bfd_get_16 (abfd, contents + irel->r_offset);
1050
1051 /* If the offset is still out of -128..+127 range,
1052 leave that far branch unchanged. */
1053 if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80)
1054 {
1055
1056 /* Note that we've changed the relocation contents, etc. */
1057 elf_section_data (sec)->relocs = internal_relocs;
1058 free_relocs = NULL;
1059
1060 elf_section_data (sec)->this_hdr.contents = contents;
1061 free_contents = NULL;
1062
1063 symtab_hdr->contents = (bfd_byte *) isymbuf;
1064 free_extsyms = NULL;
1065
1066 /* Shrink the branch. */
1067 code = (code == 0x7e) ? 0x20 : 0x8d;
1068 bfd_put_8 (abfd, code,
1069 contents + irel->r_offset - 1);
1070 bfd_put_8 (abfd, 0xff,
1071 contents + irel->r_offset);
1072 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1073 R_M68HC11_PCREL_8);
1074 m68hc11_elf_relax_delete_bytes (abfd, sec,
1075 irel->r_offset + 1, 1);
1076 /* That will change things, so, we should relax again. */
1077 *again = true;
1078 }
1079 }
1080 }
1081 prev_insn_branch = 0;
1082 prev_insn_group = 0;
1083 }
1084
1085 free (free_relocs);
1086 free_relocs = NULL;
1087
1088 if (free_contents != NULL)
1089 {
1090 if (! link_info->keep_memory)
1091 free (free_contents);
1092 else
1093 {
1094 /* Cache the section contents for elf_link_input_bfd. */
1095 elf_section_data (sec)->this_hdr.contents = contents;
1096 }
1097 free_contents = NULL;
1098 }
1099
1100 if (free_extsyms != NULL)
1101 {
1102 if (! link_info->keep_memory)
1103 free (free_extsyms);
1104 else
1105 {
1106 /* Cache the symbols for elf_link_input_bfd. */
1107 symtab_hdr->contents = (unsigned char *) isymbuf;
1108 }
1109 free_extsyms = NULL;
1110 }
1111
1112 return true;
1113
1114 error_return:
1115 free (free_relocs);
1116 free (free_contents);
1117 free (free_extsyms);
1118 return false;
1119 }
1120
1121 /* Delete some bytes from a section while relaxing. */
1122
1123 static void
m68hc11_elf_relax_delete_bytes(bfd * abfd,asection * sec,bfd_vma addr,int count)1124 m68hc11_elf_relax_delete_bytes (bfd *abfd, asection *sec,
1125 bfd_vma addr, int count)
1126 {
1127 Elf_Internal_Shdr *symtab_hdr;
1128 unsigned int sec_shndx;
1129 bfd_byte *contents;
1130 Elf_Internal_Rela *irel, *irelend;
1131 bfd_vma toaddr;
1132 Elf_Internal_Sym *isymbuf, *isym, *isymend;
1133 struct elf_link_hash_entry **sym_hashes;
1134 struct elf_link_hash_entry **end_hashes;
1135 unsigned int symcount;
1136
1137 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1138 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1139
1140 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1141
1142 contents = elf_section_data (sec)->this_hdr.contents;
1143
1144 toaddr = sec->size;
1145
1146 irel = elf_section_data (sec)->relocs;
1147 irelend = irel + sec->reloc_count;
1148
1149 /* Actually delete the bytes. */
1150 memmove (contents + addr, contents + addr + count,
1151 (size_t) (toaddr - addr - count));
1152
1153 sec->size -= count;
1154
1155 /* Adjust all the relocs. */
1156 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1157 {
1158 unsigned char code;
1159 unsigned char offset;
1160 unsigned short raddr;
1161 unsigned long old_offset;
1162 int branch_pos;
1163
1164 old_offset = irel->r_offset;
1165
1166 /* See if this reloc was for the bytes we have deleted, in which
1167 case we no longer care about it. Don't delete relocs which
1168 represent addresses, though. */
1169 if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP
1170 && irel->r_offset >= addr && irel->r_offset < addr + count)
1171 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1172 R_M68HC11_NONE);
1173
1174 if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE)
1175 continue;
1176
1177 /* Get the new reloc address. */
1178 if ((irel->r_offset > addr
1179 && irel->r_offset < toaddr))
1180 irel->r_offset -= count;
1181
1182 /* If this is a PC relative reloc, see if the range it covers
1183 includes the bytes we have deleted. */
1184 switch (ELF32_R_TYPE (irel->r_info))
1185 {
1186 default:
1187 break;
1188
1189 case R_M68HC11_RL_JUMP:
1190 code = bfd_get_8 (abfd, contents + irel->r_offset);
1191 switch (code)
1192 {
1193 /* jsr and jmp instruction are also marked with RL_JUMP
1194 relocs but no adjustment must be made. */
1195 case 0x7e:
1196 case 0x9d:
1197 case 0xbd:
1198 continue;
1199
1200 case 0x12:
1201 case 0x13:
1202 branch_pos = 3;
1203 raddr = 4;
1204
1205 /* Special case when we translate a brclr N,y into brclr *<addr>
1206 In this case, the 0x18 page2 prefix is removed.
1207 The reloc offset is not modified but the instruction
1208 size is reduced by 1. */
1209 if (old_offset == addr)
1210 raddr++;
1211 break;
1212
1213 case 0x1e:
1214 case 0x1f:
1215 branch_pos = 3;
1216 raddr = 4;
1217 break;
1218
1219 case 0x18:
1220 branch_pos = 4;
1221 raddr = 5;
1222 break;
1223
1224 default:
1225 branch_pos = 1;
1226 raddr = 2;
1227 break;
1228 }
1229 offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos);
1230 raddr += old_offset;
1231 raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0));
1232 if (irel->r_offset < addr && raddr > addr)
1233 {
1234 offset -= count;
1235 bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
1236 }
1237 else if (irel->r_offset >= addr && raddr <= addr)
1238 {
1239 offset += count;
1240 bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
1241 }
1242 else
1243 {
1244 /*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr,
1245 irel->r_offset, addr);*/
1246 }
1247
1248 break;
1249 }
1250 }
1251
1252 /* Adjust the local symbols defined in this section. */
1253 isymend = isymbuf + symtab_hdr->sh_info;
1254 for (isym = isymbuf; isym < isymend; isym++)
1255 {
1256 if (isym->st_shndx == sec_shndx
1257 && isym->st_value > addr
1258 && isym->st_value <= toaddr)
1259 isym->st_value -= count;
1260 }
1261
1262 /* Now adjust the global symbols defined in this section. */
1263 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1264 - symtab_hdr->sh_info);
1265 sym_hashes = elf_sym_hashes (abfd);
1266 end_hashes = sym_hashes + symcount;
1267 for (; sym_hashes < end_hashes; sym_hashes++)
1268 {
1269 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1270 if ((sym_hash->root.type == bfd_link_hash_defined
1271 || sym_hash->root.type == bfd_link_hash_defweak)
1272 && sym_hash->root.u.def.section == sec
1273 && sym_hash->root.u.def.value > addr
1274 && sym_hash->root.u.def.value <= toaddr)
1275 {
1276 sym_hash->root.u.def.value -= count;
1277 }
1278 }
1279 }
1280
1281 /* Specific sections:
1282 - The .page0 is a data section that is mapped in [0x0000..0x00FF].
1283 Page0 accesses are faster on the M68HC11. Soft registers used by GCC-m6811
1284 are located in .page0.
1285 - The .vectors is the section that represents the interrupt
1286 vectors. */
1287 static const struct bfd_elf_special_section elf32_m68hc11_special_sections[] =
1288 {
1289 { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
1290 { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
1291 { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
1292 { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC },
1293 { NULL, 0, 0, 0, 0 }
1294 };
1295
1296 #define ELF_ARCH bfd_arch_m68hc11
1297 #define ELF_TARGET_ID M68HC11_ELF_DATA
1298 #define ELF_MACHINE_CODE EM_68HC11
1299 #define ELF_MAXPAGESIZE 0x1000
1300
1301 #define TARGET_BIG_SYM m68hc11_elf32_vec
1302 #define TARGET_BIG_NAME "elf32-m68hc11"
1303
1304 #define elf_info_to_howto NULL
1305 #define elf_info_to_howto_rel m68hc11_info_to_howto_rel
1306 #define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section
1307 #define elf_backend_check_relocs elf32_m68hc11_check_relocs
1308 #define elf_backend_relocate_section elf32_m68hc11_relocate_section
1309 #define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
1310 #define elf_backend_object_p 0
1311 #define elf_backend_can_gc_sections 1
1312 #define elf_backend_special_sections elf32_m68hc11_special_sections
1313 #define elf_backend_merge_symbol_attribute elf32_m68hc11_merge_symbol_attribute
1314
1315 #define bfd_elf32_bfd_link_hash_table_create \
1316 m68hc11_elf_bfd_link_hash_table_create
1317 #define bfd_elf32_bfd_merge_private_bfd_data \
1318 _bfd_m68hc11_elf_merge_private_bfd_data
1319 #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
1320 #define bfd_elf32_bfd_print_private_bfd_data \
1321 _bfd_m68hc11_elf_print_private_bfd_data
1322
1323 #include "elf32-target.h"
1324