elf32-m68hc12.c
17.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
/* Motorola 68HC12-specific support for 32-bit ELF
Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
Contributed by Stephane Carrez (stcarrez@nerim.fr)
(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf32-m68hc1x.h"
#include "elf/m68hc11.h"
#include "opcode/m68hc11.h"
/* Relocation functions. */
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
PARAMS ((bfd *, bfd_reloc_code_real_type));
static void m68hc11_info_to_howto_rel
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
/* Trampoline generation. */
static bfd_boolean m68hc12_elf_size_one_stub
PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
static bfd_boolean m68hc12_elf_build_one_stub
PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
PARAMS((bfd*));
static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
/* Use REL instead of RELA to save space */
#define USE_REL 1
/* The 68HC12 microcontroler has a memory bank switching system
with a 16Kb window in the 64Kb address space. The extended memory
is mapped in the 16Kb window (at 0x8000). The page register controls
which 16Kb bank is mapped. The call/rtc instructions take care of
bank switching in function calls/returns.
For GNU Binutils to work, we consider there is a physical memory
at 0..0x0ffff and a kind of virtual memory above that. Symbols
in virtual memory have their addresses treated in a special way
when disassembling and when linking.
For the linker to work properly, we must always relocate the virtual
memory as if it is mapped at 0x8000. When a 16-bit relocation is
made in the virtual memory, we check that it does not cross the
memory bank where it is used. This would involve a page change
which would be wrong. The 24-bit relocation is for that and it
treats the address as a physical address + page number.
Banked
Address Space
| | Page n
+---------------+ 0x1010000
| |
| jsr _foo |
| .. | Page 3
| _foo: |
+---------------+ 0x100C000
| |
| call _bar |
| .. | Page 2
| _bar: |
+---------------+ 0x1008000
/------>| |
| | call _foo | Page 1
| | |
| +---------------+ 0x1004000
Physical | | |
Address Space | | | Page 0
| | |
+-----------+ 0x00FFFF | +---------------+ 0x1000000
| | |
| call _foo | |
| | |
+-----------+ 0x00BFFF -+---/
| | |
| | |
| | 16K |
| | |
+-----------+ 0x008000 -+
| |
| |
= =
| |
| |
+-----------+ 0000
The 'call _foo' must be relocated with page 3 and 16-bit address
mapped at 0x8000.
The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
static reloc_howto_type elf_m68hc11_howto_table[] = {
/* This reloc does nothing. */
HOWTO (R_M68HC11_NONE, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit absolute relocation */
HOWTO (R_M68HC11_8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_8", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit absolute relocation (upper address) */
HOWTO (R_M68HC11_HI8, /* type */
8, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_HI8", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit absolute relocation (upper address) */
HOWTO (R_M68HC11_LO8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_LO8", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit PC-rel relocation */
HOWTO (R_M68HC11_PCREL_8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_PCREL_8", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
TRUE), /* pcrel_offset */
/* A 16 bit absolute relocation */
HOWTO (R_M68HC11_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 32 bit absolute relocation. This one is never used for the
code relocation. It's used by gas for -gstabs generation. */
HOWTO (R_M68HC11_32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 3 bit absolute relocation */
HOWTO (R_M68HC11_3B, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
3, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_4B", /* name */
FALSE, /* partial_inplace */
0x003, /* src_mask */
0x003, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16 bit PC-rel relocation */
HOWTO (R_M68HC11_PCREL_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_PCREL_16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_M68HC11_GNU_VTINHERIT", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* GNU extension to record C++ vtable member usage */
HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
_bfd_elf_rel_vtable_reloc_fn, /* special_function */
"R_M68HC11_GNU_VTENTRY", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 24 bit relocation */
HOWTO (R_M68HC11_24, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
m68hc11_elf_special_reloc, /* special_function */
"R_M68HC12_24", /* name */
FALSE, /* partial_inplace */
0xffffff, /* src_mask */
0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16-bit low relocation */
HOWTO (R_M68HC11_LO16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
m68hc11_elf_special_reloc,/* special_function */
"R_M68HC12_LO16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A page relocation */
HOWTO (R_M68HC11_PAGE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
m68hc11_elf_special_reloc,/* special_function */
"R_M68HC12_PAGE", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
EMPTY_HOWTO (14),
EMPTY_HOWTO (15),
EMPTY_HOWTO (16),
EMPTY_HOWTO (17),
EMPTY_HOWTO (18),
EMPTY_HOWTO (19),
/* Mark beginning of a jump instruction (any form). */
HOWTO (R_M68HC11_RL_JUMP, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
m68hc11_elf_ignore_reloc, /* special_function */
"R_M68HC12_RL_JUMP", /* name */
TRUE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
TRUE), /* pcrel_offset */
/* Mark beginning of Gcc relaxation group instruction. */
HOWTO (R_M68HC11_RL_GROUP, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
m68hc11_elf_ignore_reloc, /* special_function */
"R_M68HC12_RL_GROUP", /* name */
TRUE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
TRUE), /* pcrel_offset */
};
/* Map BFD reloc types to M68HC11 ELF reloc types. */
struct m68hc11_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
{BFD_RELOC_NONE, R_M68HC11_NONE,},
{BFD_RELOC_8, R_M68HC11_8},
{BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
{BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
{BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
{BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
{BFD_RELOC_16, R_M68HC11_16},
{BFD_RELOC_32, R_M68HC11_32},
{BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
{BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
{BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
{BFD_RELOC_M68HC11_24, R_M68HC11_24},
{BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
{BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0;
i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
i++)
{
if (m68hc11_reloc_map[i].bfd_reloc_val == code)
return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
}
return NULL;
}
/* Set the howto pointer for an M68HC11 ELF reloc. */
static void
m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *cache_ptr;
Elf_Internal_Rela *dst;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
}
/* Far trampoline generation. */
/* Build a 68HC12 trampoline stub. */
static bfd_boolean
m68hc12_elf_build_one_stub (gen_entry, in_arg)
struct bfd_hash_entry *gen_entry;
PTR in_arg;
{
struct elf32_m68hc11_stub_hash_entry *stub_entry;
struct bfd_link_info *info;
struct m68hc11_elf_link_hash_table *htab;
asection *stub_sec;
bfd *stub_bfd;
bfd_byte *loc;
bfd_vma sym_value, phys_page, phys_addr;
/* Massage our args to the form they really have. */
stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
info = (struct bfd_link_info *) in_arg;
htab = m68hc11_elf_hash_table (info);
stub_sec = stub_entry->stub_sec;
/* Make a note of the offset within the stubs for this entry. */
stub_entry->stub_offset = stub_sec->_raw_size;
stub_sec->_raw_size += 7;
loc = stub_sec->contents + stub_entry->stub_offset;
stub_bfd = stub_sec->owner;
/* Create the trampoline call stub:
ldy #%addr(symbol)
call %page(symbol), __trampoline
*/
sym_value = (stub_entry->target_value
+ stub_entry->target_section->output_offset
+ stub_entry->target_section->output_section->vma);
phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
/* ldy #%page(sym) */
bfd_put_8 (stub_bfd, 0xCD, loc);
bfd_put_16 (stub_bfd, phys_addr, loc + 1);
loc += 3;
/* call %page(sym), __trampoline */
bfd_put_8 (stub_bfd, 0x4a, loc);
bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
bfd_put_8 (stub_bfd, phys_page, loc + 3);
return TRUE;
}
/* As above, but don't actually build the stub. Just bump offset so
we know stub section sizes. */
static bfd_boolean
m68hc12_elf_size_one_stub (gen_entry, in_arg)
struct bfd_hash_entry *gen_entry;
PTR in_arg ATTRIBUTE_UNUSED;
{
struct elf32_m68hc11_stub_hash_entry *stub_entry;
/* Massage our args to the form they really have. */
stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
stub_entry->stub_sec->_raw_size += 7;
return TRUE;
}
/* Create a 68HC12 ELF linker hash table. */
static struct bfd_link_hash_table *
m68hc12_elf_bfd_link_hash_table_create (abfd)
bfd *abfd;
{
struct m68hc11_elf_link_hash_table *ret;
ret = m68hc11_elf_hash_table_create (abfd);
if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
return NULL;
ret->size_one_stub = m68hc12_elf_size_one_stub;
ret->build_one_stub = m68hc12_elf_build_one_stub;
return &ret->root.root;
}
static bfd_boolean
m68hc12_elf_set_mach_from_flags (abfd)
bfd *abfd;
{
flagword flags = elf_elfheader (abfd)->e_flags;
switch (flags & EF_M68HC11_MACH_MASK)
{
case EF_M68HC12_MACH:
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812);
break;
case EF_M68HCS12_MACH:
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s);
break;
case EF_M68HC11_GENERIC:
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12,
bfd_mach_m6812_default);
break;
default:
return FALSE;
}
return TRUE;
}
#define ELF_ARCH bfd_arch_m68hc12
#define ELF_MACHINE_CODE EM_68HC12
#define ELF_MAXPAGESIZE 0x1000
#define TARGET_BIG_SYM bfd_elf32_m68hc12_vec
#define TARGET_BIG_NAME "elf32-m68hc12"
#define elf_info_to_howto 0
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
#define elf_backend_check_relocs elf32_m68hc11_check_relocs
#define elf_backend_relocate_section elf32_m68hc11_relocate_section
#define elf_backend_object_p m68hc12_elf_set_mach_from_flags
#define elf_backend_final_write_processing 0
#define elf_backend_can_gc_sections 1
#define elf_backend_post_process_headers elf32_m68hc11_post_process_headers
#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
#define bfd_elf32_bfd_link_hash_table_create \
m68hc12_elf_bfd_link_hash_table_create
#define bfd_elf32_bfd_link_hash_table_free \
m68hc11_elf_bfd_link_hash_table_free
#define bfd_elf32_bfd_merge_private_bfd_data \
_bfd_m68hc11_elf_merge_private_bfd_data
#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
#define bfd_elf32_bfd_print_private_bfd_data \
_bfd_m68hc11_elf_print_private_bfd_data
#include "elf32-target.h"