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[deliverable/binutils-gdb.git] / bfd / elf32-m68hc12.c
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60bcf0fa 1/* Motorola 68HC12-specific support for 32-bit ELF
5efbbc43 2 Copyright 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2012
07adf181 3 Free Software Foundation, Inc.
dae78fb0 4 Contributed by Stephane Carrez (stcarrez@nerim.fr)
60bcf0fa
NC		 5 (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
6
cd123cb7 7 This file is part of BFD, the Binary File Descriptor library.
60bcf0fa 8
cd123cb7
NC		 9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
60bcf0fa 13
cd123cb7
NC		 14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
60bcf0fa 18
cd123cb7
NC		 19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
60bcf0fa 23
60bcf0fa 24#include "sysdep.h"
3db64b00 25#include "bfd.h"
3a65329d 26#include "bfdlink.h"
60bcf0fa
NC		 27#include "libbfd.h"
28#include "elf-bfd.h"
3a65329d 29#include "elf32-m68hc1x.h"
60bcf0fa 30#include "elf/m68hc11.h"
dae78fb0 31#include "opcode/m68hc11.h"
60bcf0fa 32
3a65329d 33/* Relocation functions. */
60bcf0fa 34static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
0a6a3ebe 35 (bfd *, bfd_reloc_code_real_type);
60bcf0fa 36static void m68hc11_info_to_howto_rel
0a6a3ebe 37 (bfd *, arelent *, Elf_Internal_Rela *);
60bcf0fa 38
3a65329d
SC		 39/* Trampoline generation. */
40static bfd_boolean m68hc12_elf_size_one_stub
0a6a3ebe 41 (struct bfd_hash_entry *gen_entry, void *in_arg);
3a65329d 42static bfd_boolean m68hc12_elf_build_one_stub
0a6a3ebe 43 (struct bfd_hash_entry *gen_entry, void *in_arg);
3a65329d 44static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
0a6a3ebe 45 (bfd*);
9b701e44 46
cf3d882d
AM		 47static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
48
60bcf0fa 49/* Use REL instead of RELA to save space */
acf8aed4 50#define USE_REL 1
60bcf0fa 51
3a65329d 52/* The 68HC12 microcontroler has a memory bank switching system
dae78fb0
SC		 53 with a 16Kb window in the 64Kb address space. The extended memory
54 is mapped in the 16Kb window (at 0x8000). The page register controls
55 which 16Kb bank is mapped. The call/rtc instructions take care of
56 bank switching in function calls/returns.
57
58 For GNU Binutils to work, we consider there is a physical memory
59 at 0..0x0ffff and a kind of virtual memory above that. Symbols
60 in virtual memory have their addresses treated in a special way
61 when disassembling and when linking.
62
63 For the linker to work properly, we must always relocate the virtual
64 memory as if it is mapped at 0x8000. When a 16-bit relocation is
65 made in the virtual memory, we check that it does not cross the
66 memory bank where it is used. This would involve a page change
67 which would be wrong. The 24-bit relocation is for that and it
68 treats the address as a physical address + page number.
69
70
71 Banked
72 Address Space
73 | | Page n
74 +---------------+ 0x1010000
75 | |
76 | jsr _foo |
77 | .. | Page 3
78 | _foo: |
79 +---------------+ 0x100C000
80 | |
81 | call _bar |
82 | .. | Page 2
83 | _bar: |
84 +---------------+ 0x1008000
85 /------>| |
86 | | call _foo | Page 1
87 | | |
88 | +---------------+ 0x1004000
89 Physical | | |
90 Address Space | | | Page 0
91 | | |
92 +-----------+ 0x00FFFF | +---------------+ 0x1000000
93 | | |
94 | call _foo | |
95 | | |
96 +-----------+ 0x00BFFF -+---/
97 | | |
98 | | |
99 | | 16K |
100 | | |
101 +-----------+ 0x008000 -+
102 | |
103 | |
104 = =
105 | |
106 | |
107 +-----------+ 0000
108
109
110 The 'call _foo' must be relocated with page 3 and 16-bit address
b34976b6 111 mapped at 0x8000.
dae78fb0 112
60bcf0fa
NC		 113 The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
114static reloc_howto_type elf_m68hc11_howto_table[] = {
115 /* This reloc does nothing. */
116 HOWTO (R_M68HC11_NONE, /* type */
117 0, /* rightshift */
118 2, /* size (0 = byte, 1 = short, 2 = long) */
119 32, /* bitsize */
b34976b6 120 FALSE, /* pc_relative */
60bcf0fa 121 0, /* bitpos */
dae78fb0 122 complain_overflow_dont,/* complain_on_overflow */
60bcf0fa 123 bfd_elf_generic_reloc, /* special_function */
dae78fb0 124 "R_M68HC12_NONE", /* name */
b34976b6 125 FALSE, /* partial_inplace */
60bcf0fa
NC		 126 0, /* src_mask */
127 0, /* dst_mask */
b34976b6 128 FALSE), /* pcrel_offset */
60bcf0fa
NC		 129
130 /* A 8 bit absolute relocation */
131 HOWTO (R_M68HC11_8, /* type */
132 0, /* rightshift */
133 0, /* size (0 = byte, 1 = short, 2 = long) */
134 8, /* bitsize */
b34976b6 135 FALSE, /* pc_relative */
60bcf0fa
NC		 136 0, /* bitpos */
137 complain_overflow_bitfield, /* complain_on_overflow */
138 bfd_elf_generic_reloc, /* special_function */
dae78fb0 139 "R_M68HC12_8", /* name */
b34976b6 140 FALSE, /* partial_inplace */
60bcf0fa
NC		 141 0x00ff, /* src_mask */
142 0x00ff, /* dst_mask */
b34976b6 143 FALSE), /* pcrel_offset */
60bcf0fa
NC		 144
145 /* A 8 bit absolute relocation (upper address) */
146 HOWTO (R_M68HC11_HI8, /* type */
147 8, /* rightshift */
148 0, /* size (0 = byte, 1 = short, 2 = long) */
149 8, /* bitsize */
b34976b6 150 FALSE, /* pc_relative */
60bcf0fa
NC		 151 0, /* bitpos */
152 complain_overflow_bitfield, /* complain_on_overflow */
153 bfd_elf_generic_reloc, /* special_function */
dae78fb0 154 "R_M68HC12_HI8", /* name */
b34976b6 155 FALSE, /* partial_inplace */
60bcf0fa
NC		 156 0x00ff, /* src_mask */
157 0x00ff, /* dst_mask */
b34976b6 158 FALSE), /* pcrel_offset */
60bcf0fa
NC		 159
160 /* A 8 bit absolute relocation (upper address) */
161 HOWTO (R_M68HC11_LO8, /* type */
162 0, /* rightshift */
163 0, /* size (0 = byte, 1 = short, 2 = long) */
164 8, /* bitsize */
b34976b6 165 FALSE, /* pc_relative */
60bcf0fa
NC		 166 0, /* bitpos */
167 complain_overflow_dont, /* complain_on_overflow */
168 bfd_elf_generic_reloc, /* special_function */
dae78fb0 169 "R_M68HC12_LO8", /* name */
b34976b6 170 FALSE, /* partial_inplace */
60bcf0fa
NC		 171 0x00ff, /* src_mask */
172 0x00ff, /* dst_mask */
b34976b6 173 FALSE), /* pcrel_offset */
60bcf0fa
NC		 174
175 /* A 8 bit PC-rel relocation */
176 HOWTO (R_M68HC11_PCREL_8, /* type */
177 0, /* rightshift */
178 0, /* size (0 = byte, 1 = short, 2 = long) */
179 8, /* bitsize */
b34976b6 180 TRUE, /* pc_relative */
60bcf0fa
NC		 181 0, /* bitpos */
182 complain_overflow_bitfield, /* complain_on_overflow */
183 bfd_elf_generic_reloc, /* special_function */
dae78fb0 184 "R_M68HC12_PCREL_8", /* name */
b34976b6 185 FALSE, /* partial_inplace */
dae78fb0 186 0x00ff, /* src_mask */
60bcf0fa 187 0x00ff, /* dst_mask */
3a65329d 188 TRUE), /* pcrel_offset */
60bcf0fa
NC		 189
190 /* A 16 bit absolute relocation */
191 HOWTO (R_M68HC11_16, /* type */
192 0, /* rightshift */
193 1, /* size (0 = byte, 1 = short, 2 = long) */
194 16, /* bitsize */
b34976b6 195 FALSE, /* pc_relative */
60bcf0fa
NC		 196 0, /* bitpos */
197 complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
3a65329d 198 bfd_elf_generic_reloc, /* special_function */
dae78fb0 199 "R_M68HC12_16", /* name */
b34976b6 200 FALSE, /* partial_inplace */
60bcf0fa
NC		 201 0xffff, /* src_mask */
202 0xffff, /* dst_mask */
b34976b6 203 FALSE), /* pcrel_offset */
60bcf0fa
NC		 204
205 /* A 32 bit absolute relocation. This one is never used for the
206 code relocation. It's used by gas for -gstabs generation. */
207 HOWTO (R_M68HC11_32, /* type */
208 0, /* rightshift */
209 2, /* size (0 = byte, 1 = short, 2 = long) */
210 32, /* bitsize */
b34976b6 211 FALSE, /* pc_relative */
60bcf0fa
NC		 212 0, /* bitpos */
213 complain_overflow_bitfield, /* complain_on_overflow */
214 bfd_elf_generic_reloc, /* special_function */
dae78fb0 215 "R_M68HC12_32", /* name */
b34976b6 216 FALSE, /* partial_inplace */
60bcf0fa
NC		 217 0xffffffff, /* src_mask */
218 0xffffffff, /* dst_mask */
b34976b6 219 FALSE), /* pcrel_offset */
60bcf0fa
NC		 220
221 /* A 3 bit absolute relocation */
222 HOWTO (R_M68HC11_3B, /* type */
223 0, /* rightshift */
224 0, /* size (0 = byte, 1 = short, 2 = long) */
225 3, /* bitsize */
b34976b6 226 FALSE, /* pc_relative */
60bcf0fa
NC		 227 0, /* bitpos */
228 complain_overflow_bitfield, /* complain_on_overflow */
229 bfd_elf_generic_reloc, /* special_function */
dae78fb0 230 "R_M68HC12_4B", /* name */
b34976b6 231 FALSE, /* partial_inplace */
60bcf0fa
NC		 232 0x003, /* src_mask */
233 0x003, /* dst_mask */
b34976b6 234 FALSE), /* pcrel_offset */
60bcf0fa
NC		 235
236 /* A 16 bit PC-rel relocation */
237 HOWTO (R_M68HC11_PCREL_16, /* type */
238 0, /* rightshift */
239 1, /* size (0 = byte, 1 = short, 2 = long) */
240 16, /* bitsize */
b34976b6 241 TRUE, /* pc_relative */
60bcf0fa
NC		 242 0, /* bitpos */
243 complain_overflow_dont, /* complain_on_overflow */
244 bfd_elf_generic_reloc, /* special_function */
dae78fb0 245 "R_M68HC12_PCREL_16", /* name */
b34976b6 246 FALSE, /* partial_inplace */
dae78fb0 247 0xffff, /* src_mask */
60bcf0fa 248 0xffff, /* dst_mask */
3a65329d 249 TRUE), /* pcrel_offset */
60bcf0fa
NC		 250
251 /* GNU extension to record C++ vtable hierarchy */
252 HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
253 0, /* rightshift */
254 1, /* size (0 = byte, 1 = short, 2 = long) */
255 0, /* bitsize */
b34976b6 256 FALSE, /* pc_relative */
60bcf0fa
NC		 257 0, /* bitpos */
258 complain_overflow_dont, /* complain_on_overflow */
259 NULL, /* special_function */
260 "R_M68HC11_GNU_VTINHERIT", /* name */
b34976b6 261 FALSE, /* partial_inplace */
60bcf0fa
NC		 262 0, /* src_mask */
263 0, /* dst_mask */
b34976b6 264 FALSE), /* pcrel_offset */
60bcf0fa
NC		 265
266 /* GNU extension to record C++ vtable member usage */
267 HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
268 0, /* rightshift */
269 1, /* size (0 = byte, 1 = short, 2 = long) */
270 0, /* bitsize */
b34976b6 271 FALSE, /* pc_relative */
60bcf0fa
NC		 272 0, /* bitpos */
273 complain_overflow_dont, /* complain_on_overflow */
274 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
275 "R_M68HC11_GNU_VTENTRY", /* name */
b34976b6 276 FALSE, /* partial_inplace */
60bcf0fa
NC		 277 0, /* src_mask */
278 0, /* dst_mask */
b34976b6 279 FALSE), /* pcrel_offset */
dae78fb0
SC		 280
281 /* A 24 bit relocation */
282 HOWTO (R_M68HC11_24, /* type */
283 0, /* rightshift */
3a65329d 284 2, /* size (0 = byte, 1 = short, 2 = long) */
dae78fb0 285 24, /* bitsize */
b34976b6 286 FALSE, /* pc_relative */
dae78fb0
SC		 287 0, /* bitpos */
288 complain_overflow_dont, /* complain_on_overflow */
3a65329d 289 m68hc11_elf_special_reloc, /* special_function */
dae78fb0 290 "R_M68HC12_24", /* name */
b34976b6 291 FALSE, /* partial_inplace */
3a65329d
SC		 292 0xffffff, /* src_mask */
293 0xffffff, /* dst_mask */
b34976b6
AM		 294 FALSE), /* pcrel_offset */
295
dae78fb0
SC		 296 /* A 16-bit low relocation */
297 HOWTO (R_M68HC11_LO16, /* type */
298 0, /* rightshift */
299 1, /* size (0 = byte, 1 = short, 2 = long) */
300 16, /* bitsize */
b34976b6 301 FALSE, /* pc_relative */
dae78fb0
SC		 302 0, /* bitpos */
303 complain_overflow_dont, /* complain_on_overflow */
3a65329d 304 m68hc11_elf_special_reloc,/* special_function */
dae78fb0 305 "R_M68HC12_LO16", /* name */
b34976b6 306 FALSE, /* partial_inplace */
dae78fb0
SC		 307 0xffff, /* src_mask */
308 0xffff, /* dst_mask */
b34976b6 309 FALSE), /* pcrel_offset */
dae78fb0
SC		 310
311 /* A page relocation */
312 HOWTO (R_M68HC11_PAGE, /* type */
313 0, /* rightshift */
314 0, /* size (0 = byte, 1 = short, 2 = long) */
315 8, /* bitsize */
b34976b6 316 FALSE, /* pc_relative */
dae78fb0
SC		 317 0, /* bitpos */
318 complain_overflow_dont, /* complain_on_overflow */
3a65329d 319 m68hc11_elf_special_reloc,/* special_function */
dae78fb0 320 "R_M68HC12_PAGE", /* name */
b34976b6 321 FALSE, /* partial_inplace */
dae78fb0
SC		 322 0x00ff, /* src_mask */
323 0x00ff, /* dst_mask */
b34976b6 324 FALSE), /* pcrel_offset */
dae78fb0
SC		 325
326 EMPTY_HOWTO (14),
6927f982
NC		 327
328 /* A 16 bit absolute relocation. */
329 HOWTO (R_M68HC12_16B, /* type */
330 0, /* rightshift */
331 1, /* size (0 = byte, 1 = short, 2 = long) */
332 16, /* bitsize */
333 FALSE, /* pc_relative */
334 0, /* bitpos */
335 complain_overflow_bitfield, /* complain_on_overflow */
336 bfd_elf_generic_reloc, /* special_function */
337 "R_M68HC12_16B", /* name */
338 FALSE, /* partial_inplace */
339 0xffff, /* src_mask */
340 0xffff, /* dst_mask */
341 FALSE), /* pcrel_offset */
342
343 /* A 9 bit PC-rel relocation. */
344 HOWTO (R_M68HC12_PCREL_9, /* type */
345 1, /* rightshift */
346 1, /* size (0 = byte, 1 = short, 2 = long) */
347 10, /* bitsize (result is >>1) */
348 TRUE, /* pc_relative */
349 0, /* bitpos */
350 complain_overflow_dont, /* complain_on_overflow */
351 bfd_elf_generic_reloc, /* special_function */
352 "R_M68HC12_PCREL_9", /* name */
353 TRUE, /* partial_inplace */
354 0xfe00, /* src_mask */
355 0x01ff, /* dst_mask */
356 TRUE), /* pcrel_offset */
357
358 /* A 10 bit PC-rel relocation. */
359 HOWTO (R_M68HC12_PCREL_10, /* type */
360 1, /* rightshift */
361 1, /* size (0 = byte, 1 = short, 2 = long) */
362 11, /* bitsize (result is >>1) */
363 TRUE, /* pc_relative */
364 0, /* bitpos */
365 complain_overflow_dont, /* complain_on_overflow */
366 bfd_elf_generic_reloc, /* special_function */
367 "R_M68HC12_PCREL_10", /* name */
368 TRUE, /* partial_inplace */
369 0xfc00, /* src_mask */
370 0x03ff, /* dst_mask */
371 TRUE), /* pcrel_offset */
372
373 /* A 8 bit absolute relocation (upper address). */
374 HOWTO (R_M68HC12_HI8XG, /* type */
375 8, /* rightshift */
376 0, /* size (0 = byte, 1 = short, 2 = long) */
377 8, /* bitsize */
378 FALSE, /* pc_relative */
379 0, /* bitpos */
380 complain_overflow_bitfield, /* complain_on_overflow */
381 bfd_elf_generic_reloc, /* special_function */
382 "R_M68HC12_HI8XG", /* name */
383 FALSE, /* partial_inplace */
384 0x00ff, /* src_mask */
385 0x00ff, /* dst_mask */
386 FALSE), /* pcrel_offset */
387
388 /* A 8 bit absolute relocation (lower address). */
389 HOWTO (R_M68HC12_LO8XG, /* type */
390 8, /* rightshift */
391 0, /* size (0 = byte, 1 = short, 2 = long) */
392 8, /* bitsize */
393 FALSE, /* pc_relative */
394 0, /* bitpos */
395 complain_overflow_bitfield, /* complain_on_overflow */
396 bfd_elf_generic_reloc, /* special_function */
397 "R_M68HC12_LO8XG", /* name */
398 FALSE, /* partial_inplace */
399 0x00ff, /* src_mask */
400 0x00ff, /* dst_mask */
401 FALSE), /* pcrel_offset */
b34976b6 402
dae78fb0
SC		 403 /* Mark beginning of a jump instruction (any form). */
404 HOWTO (R_M68HC11_RL_JUMP, /* type */
405 0, /* rightshift */
406 1, /* size (0 = byte, 1 = short, 2 = long) */
407 0, /* bitsize */
b34976b6 408 FALSE, /* pc_relative */
dae78fb0
SC		 409 0, /* bitpos */
410 complain_overflow_dont, /* complain_on_overflow */
411 m68hc11_elf_ignore_reloc, /* special_function */
412 "R_M68HC12_RL_JUMP", /* name */
b34976b6 413 TRUE, /* partial_inplace */
dae78fb0
SC		 414 0, /* src_mask */
415 0, /* dst_mask */
b34976b6 416 TRUE), /* pcrel_offset */
dae78fb0
SC		 417
418 /* Mark beginning of Gcc relaxation group instruction. */
419 HOWTO (R_M68HC11_RL_GROUP, /* type */
420 0, /* rightshift */
421 1, /* size (0 = byte, 1 = short, 2 = long) */
422 0, /* bitsize */
b34976b6 423 FALSE, /* pc_relative */
dae78fb0
SC		 424 0, /* bitpos */
425 complain_overflow_dont, /* complain_on_overflow */
426 m68hc11_elf_ignore_reloc, /* special_function */
427 "R_M68HC12_RL_GROUP", /* name */
b34976b6 428 TRUE, /* partial_inplace */
dae78fb0
SC		 429 0, /* src_mask */
430 0, /* dst_mask */
b34976b6 431 TRUE), /* pcrel_offset */
60bcf0fa
NC		 432};
433
434/* Map BFD reloc types to M68HC11 ELF reloc types. */
435
436struct m68hc11_reloc_map
437{
438 bfd_reloc_code_real_type bfd_reloc_val;
439 unsigned char elf_reloc_val;
440};
441
6927f982
NC		 442static const struct m68hc11_reloc_map m68hc11_reloc_map[] =
443{
60bcf0fa
NC		 444 {BFD_RELOC_NONE, R_M68HC11_NONE,},
445 {BFD_RELOC_8, R_M68HC11_8},
446 {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
447 {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
448 {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
449 {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
450 {BFD_RELOC_16, R_M68HC11_16},
451 {BFD_RELOC_32, R_M68HC11_32},
452 {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
453
60bcf0fa
NC		 454 {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
455 {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
dae78fb0
SC		 456
457 {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
458 {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
459 {BFD_RELOC_M68HC11_24, R_M68HC11_24},
460
461 {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
462 {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
6927f982
NC		 463
464 {BFD_RELOC_M68HC12_16B, R_M68HC12_16B},
465
466 {BFD_RELOC_M68HC12_9_PCREL, R_M68HC12_PCREL_9},
467 {BFD_RELOC_M68HC12_10_PCREL, R_M68HC12_PCREL_10},
468 {BFD_RELOC_M68HC12_HI8XG, R_M68HC12_HI8XG},
469 {BFD_RELOC_M68HC12_LO8XG, R_M68HC12_LO8XG},
60bcf0fa
NC		 470};
471
472static reloc_howto_type *
0a6a3ebe
SC		 473bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
474 bfd_reloc_code_real_type code)
60bcf0fa
NC		 475{
476 unsigned int i;
477
478 for (i = 0;
479 i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
480 i++)
481 {
482 if (m68hc11_reloc_map[i].bfd_reloc_val == code)
483 return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
484 }
485
486 return NULL;
487}
488
157090f7
AM		 489static reloc_howto_type *
490bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
491 const char *r_name)
492{
493 unsigned int i;
494
495 for (i = 0;
496 i < (sizeof (elf_m68hc11_howto_table)
497 / sizeof (elf_m68hc11_howto_table[0]));
498 i++)
499 if (elf_m68hc11_howto_table[i].name != NULL
500 && strcasecmp (elf_m68hc11_howto_table[i].name, r_name) == 0)
501 return &elf_m68hc11_howto_table[i];
502
503 return NULL;
504}
505
3a65329d 506/* Set the howto pointer for an M68HC11 ELF reloc. */
dae78fb0 507
3a65329d 508static void
0a6a3ebe
SC		 509m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
510 arelent *cache_ptr, Elf_Internal_Rela *dst)
dae78fb0 511{
3a65329d 512 unsigned int r_type;
dae78fb0 513
3a65329d
SC		 514 r_type = ELF32_R_TYPE (dst->r_info);
515 BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
516 cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
dae78fb0
SC		 517}
518
3a65329d
SC		 519\f
520/* Far trampoline generation. */
dae78fb0 521
3a65329d
SC		 522/* Build a 68HC12 trampoline stub. */
523static bfd_boolean
0a6a3ebe 524m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
dae78fb0 525{
3a65329d
SC		 526 struct elf32_m68hc11_stub_hash_entry *stub_entry;
527 struct bfd_link_info *info;
528 struct m68hc11_elf_link_hash_table *htab;
529 asection *stub_sec;
530 bfd *stub_bfd;
531 bfd_byte *loc;
532 bfd_vma sym_value, phys_page, phys_addr;
dae78fb0 533
3a65329d
SC		 534 /* Massage our args to the form they really have. */
535 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
536 info = (struct bfd_link_info *) in_arg;
dae78fb0 537
3a65329d 538 htab = m68hc11_elf_hash_table (info);
dae78fb0 539
3a65329d 540 stub_sec = stub_entry->stub_sec;
dae78fb0 541
3a65329d 542 /* Make a note of the offset within the stubs for this entry. */
eea6121a
AM		 543 stub_entry->stub_offset = stub_sec->size;
544 stub_sec->size += 7;
3a65329d 545 loc = stub_sec->contents + stub_entry->stub_offset;
dae78fb0 546
3a65329d 547 stub_bfd = stub_sec->owner;
dae78fb0 548
3a65329d 549 /* Create the trampoline call stub:
dae78fb0 550
3a65329d
SC		 551 ldy #%addr(symbol)
552 call %page(symbol), __trampoline
dae78fb0 553
3a65329d
SC		 554 */
555 sym_value = (stub_entry->target_value
556 + stub_entry->target_section->output_offset
557 + stub_entry->target_section->output_section->vma);
558 phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
559 phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
dae78fb0 560
3a65329d
SC		 561 /* ldy #%page(sym) */
562 bfd_put_8 (stub_bfd, 0xCD, loc);
563 bfd_put_16 (stub_bfd, phys_addr, loc + 1);
564 loc += 3;
dae78fb0 565
3a65329d
SC		 566 /* call %page(sym), __trampoline */
567 bfd_put_8 (stub_bfd, 0x4a, loc);
568 bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
569 bfd_put_8 (stub_bfd, phys_page, loc + 3);
b34976b6 570
3a65329d 571 return TRUE;
dae78fb0
SC		 572}
573
3a65329d
SC		 574/* As above, but don't actually build the stub. Just bump offset so
575 we know stub section sizes. */
60bcf0fa 576
3a65329d 577static bfd_boolean
0a6a3ebe
SC		 578m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry,
579 void *in_arg ATTRIBUTE_UNUSED)
60bcf0fa 580{
3a65329d 581 struct elf32_m68hc11_stub_hash_entry *stub_entry;
60bcf0fa 582
3a65329d
SC		 583 /* Massage our args to the form they really have. */
584 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
585
eea6121a 586 stub_entry->stub_sec->size += 7;
3a65329d 587 return TRUE;
60bcf0fa
NC		 588}
589
3a65329d
SC		 590/* Create a 68HC12 ELF linker hash table. */
591
592static struct bfd_link_hash_table *
0a6a3ebe 593m68hc12_elf_bfd_link_hash_table_create (bfd *abfd)
9b701e44 594{
3a65329d 595 struct m68hc11_elf_link_hash_table *ret;
56780f18 596
3a65329d
SC		 597 ret = m68hc11_elf_hash_table_create (abfd);
598 if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
599 return NULL;
9b701e44 600
3a65329d
SC		 601 ret->size_one_stub = m68hc12_elf_size_one_stub;
602 ret->build_one_stub = m68hc12_elf_build_one_stub;
9b701e44 603
3a65329d
SC		 604 return &ret->root.root;
605}
96405e3c 606\f
bc7c6a90 607static bfd_boolean
0a6a3ebe 608m68hc12_elf_set_mach_from_flags (bfd *abfd)
bc7c6a90
SC		 609{
610 flagword flags = elf_elfheader (abfd)->e_flags;
611
612 switch (flags & EF_M68HC11_MACH_MASK)
613 {
614 case EF_M68HC12_MACH:
615 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812);
616 break;
617 case EF_M68HCS12_MACH:
618 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s);
619 break;
620 case EF_M68HC11_GENERIC:
621 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12,
622 bfd_mach_m6812_default);
623 break;
624 default:
625 return FALSE;
626 }
627 return TRUE;
628}
629
3f533aa9
SC		 630/* Specific sections:
631 - The .page0 is a data section that is mapped in [0x0000..0x00FF].
632 Page0 accesses are faster on the M68HC12.
633 - The .vectors is the section that represents the interrupt
634 vectors. */
b35d266b 635static const struct bfd_elf_special_section elf32_m68hc12_special_sections[] =
3f533aa9 636{
0112cd26
NC		 637 { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
638 { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
639 { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
640 { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC },
641 { NULL, 0, 0, 0, 0 }
7f4d3958 642};
3f533aa9 643\f
60bcf0fa 644#define ELF_ARCH bfd_arch_m68hc12
ae95ffa6 645#define ELF_TARGET_ID M68HC11_ELF_DATA
60bcf0fa
NC		 646#define ELF_MACHINE_CODE EM_68HC12
647#define ELF_MAXPAGESIZE 0x1000
648
649#define TARGET_BIG_SYM bfd_elf32_m68hc12_vec
650#define TARGET_BIG_NAME "elf32-m68hc12"
651
652#define elf_info_to_howto 0
653#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
3a65329d
SC		 654#define elf_backend_check_relocs elf32_m68hc11_check_relocs
655#define elf_backend_relocate_section elf32_m68hc11_relocate_section
bc7c6a90 656#define elf_backend_object_p m68hc12_elf_set_mach_from_flags
60bcf0fa 657#define elf_backend_final_write_processing 0
3a65329d 658#define elf_backend_can_gc_sections 1
29ef7005 659#define elf_backend_special_sections elf32_m68hc12_special_sections
3a65329d
SC		 660#define elf_backend_post_process_headers elf32_m68hc11_post_process_headers
661#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
5efbbc43 662#define elf_backend_merge_symbol_attribute elf32_m68hc11_merge_symbol_attribute
3a65329d
SC		 663
664#define bfd_elf32_bfd_link_hash_table_create \
665 m68hc12_elf_bfd_link_hash_table_create
666#define bfd_elf32_bfd_link_hash_table_free \
667 m68hc11_elf_bfd_link_hash_table_free
96405e3c 668#define bfd_elf32_bfd_merge_private_bfd_data \
3a65329d
SC		 669 _bfd_m68hc11_elf_merge_private_bfd_data
670#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
96405e3c 671#define bfd_elf32_bfd_print_private_bfd_data \
3a65329d 672 _bfd_m68hc11_elf_print_private_bfd_data
96405e3c 673
60bcf0fa 674#include "elf32-target.h"
GDB Binutils - Deliverables
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