1 /* m68hc11-dis.c -- Motorola 68HC11 & 68HC12 disassembly
2 Copyright 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Written by Stephane Carrez (stcarrez@nerim.fr)
6 This file is part of the GNU opcodes library.
8 This library 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, or (at your option)
13 It is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 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, Boston,
21 MA 02110-1301, USA. */
26 #include "opcode/m68hc11.h"
31 static const char *const reg_name[] = {
35 static const char *const reg_src_table[] = {
36 "A", "B", "CCR", "TMP3", "D", "X", "Y", "SP"
39 static const char *const reg_dst_table[] = {
40 "A", "B", "CCR", "TMP2", "D", "X", "Y", "SP"
43 #define OP_PAGE_MASK (M6811_OP_PAGE2|M6811_OP_PAGE3|M6811_OP_PAGE4)
45 /* Prototypes for local functions. */
46 static int read_memory (bfd_vma, bfd_byte *, int, struct disassemble_info *);
47 static int print_indexed_operand (bfd_vma, struct disassemble_info *,
48 int*, int, int, bfd_vma);
49 static int print_insn (bfd_vma, struct disassemble_info *, int);
52 read_memory (bfd_vma memaddr, bfd_byte* buffer, int size,
53 struct disassemble_info* info)
57 /* Get first byte. Only one at a time because we don't know the
59 status = (*info->read_memory_func) (memaddr, buffer, size, info);
62 (*info->memory_error_func) (status, memaddr, info);
69 /* Read the 68HC12 indexed operand byte and print the corresponding mode.
70 Returns the number of bytes read or -1 if failure. */
72 print_indexed_operand (bfd_vma memaddr, struct disassemble_info* info,
73 int* indirect, int mov_insn, int pc_offset,
85 status = read_memory (memaddr, &buffer[0], 1, info);
91 /* n,r with 5-bits signed constant. */
92 if ((buffer[0] & 0x20) == 0)
94 reg = (buffer[0] >> 6) & 3;
95 sval = (buffer[0] & 0x1f);
98 /* 68HC12 requires an adjustment for movb/movw pc relative modes. */
99 if (reg == PC_REGNUM && info->mach == bfd_mach_m6812 && mov_insn)
101 (*info->fprintf_func) (info->stream, "%d,%s",
102 (int) sval, reg_name[reg]);
104 if (reg == PC_REGNUM)
106 (* info->fprintf_func) (info->stream, " {");
107 (* info->print_address_func) (endaddr + sval, info);
108 (* info->fprintf_func) (info->stream, "}");
112 /* Auto pre/post increment/decrement. */
113 else if ((buffer[0] & 0xc0) != 0xc0)
117 reg = (buffer[0] >> 6) & 3;
118 sval = (buffer[0] & 0x0f);
130 (*info->fprintf_func) (info->stream, "%d,%s%s%s",
132 (buffer[0] & 0x10 ? "" : mode),
133 reg_name[reg], (buffer[0] & 0x10 ? mode : ""));
136 /* [n,r] 16-bits offset indexed indirect. */
137 else if ((buffer[0] & 0x07) == 3)
141 (*info->fprintf_func) (info->stream, "<invalid op: 0x%x>",
145 reg = (buffer[0] >> 3) & 0x03;
146 status = read_memory (memaddr + pos, &buffer[0], 2, info);
153 sval = ((buffer[0] << 8) | (buffer[1] & 0x0FF));
154 (*info->fprintf_func) (info->stream, "[%u,%s]",
155 sval & 0x0ffff, reg_name[reg]);
160 /* n,r with 9 and 16 bit signed constant. */
161 else if ((buffer[0] & 0x4) == 0)
165 (*info->fprintf_func) (info->stream, "<invalid op: 0x%x>",
169 reg = (buffer[0] >> 3) & 0x03;
170 status = read_memory (memaddr + pos,
171 &buffer[1], (buffer[0] & 0x2 ? 2 : 1), info);
178 sval = ((buffer[1] << 8) | (buffer[2] & 0x0FF));
185 sval = buffer[1] & 0x00ff;
186 if (buffer[0] & 0x01)
191 (*info->fprintf_func) (info->stream, "%d,%s",
192 (int) sval, reg_name[reg]);
193 if (reg == PC_REGNUM)
195 (* info->fprintf_func) (info->stream, " {");
196 (* info->print_address_func) (endaddr + sval, info);
197 (* info->fprintf_func) (info->stream, "}");
202 reg = (buffer[0] >> 3) & 0x03;
203 switch (buffer[0] & 3)
206 (*info->fprintf_func) (info->stream, "A,%s", reg_name[reg]);
209 (*info->fprintf_func) (info->stream, "B,%s", reg_name[reg]);
212 (*info->fprintf_func) (info->stream, "D,%s", reg_name[reg]);
216 (*info->fprintf_func) (info->stream, "[D,%s]", reg_name[reg]);
226 /* Disassemble one instruction at address 'memaddr'. Returns the number
227 of bytes used by that instruction. */
229 print_insn (bfd_vma memaddr, struct disassemble_info* info, int arch)
236 const struct m68hc11_opcode *opcode;
238 /* Get first byte. Only one at a time because we don't know the
240 status = read_memory (memaddr, buffer, 1, info);
250 /* Look for page2,3,4 opcodes. */
251 if (code == M6811_OPCODE_PAGE2)
254 format = M6811_OP_PAGE2;
256 else if (code == M6811_OPCODE_PAGE3 && arch == cpu6811)
259 format = M6811_OP_PAGE3;
261 else if (code == M6811_OPCODE_PAGE4 && arch == cpu6811)
264 format = M6811_OP_PAGE4;
267 /* We are in page2,3,4; get the real opcode. */
270 status = read_memory (memaddr + pos, &buffer[1], 1, info);
279 /* Look first for a 68HC12 alias. All of them are 2-bytes long and
280 in page 1. There is no operand to print. We read the second byte
281 only when we have a possible match. */
282 if ((arch & cpu6812) && format == 0)
286 /* Walk the alias table to find a code1+code2 match. */
287 for (i = 0; i < m68hc12_num_alias; i++)
289 if (m68hc12_alias[i].code1 == code)
293 status = read_memory (memaddr + pos + 1,
294 &buffer[1], 1, info);
300 if (m68hc12_alias[i].code2 == (unsigned char) buffer[1])
302 (*info->fprintf_func) (info->stream, "%s",
303 m68hc12_alias[i].name);
312 /* Scan the opcode table until we find the opcode
313 with the corresponding page. */
314 opcode = m68hc11_opcodes;
315 for (i = 0; i < m68hc11_num_opcodes; i++, opcode++)
319 int pc_dst_offset = 0;
321 if ((opcode->arch & arch) == 0)
323 if (opcode->opcode != code)
325 if ((opcode->format & OP_PAGE_MASK) != format)
328 if (opcode->format & M6812_OP_REG)
333 if (opcode->format & M6811_OP_JUMP_REL)
338 status = read_memory (memaddr + pos, &buffer[0], 1, info);
343 for (j = 0; i + j < m68hc11_num_opcodes; j++)
345 if ((opcode[j].arch & arch) == 0)
347 if (opcode[j].opcode != code)
351 if (!(opcode[j].format & M6811_OP_JUMP_REL))
354 if ((opcode[j].format & M6812_OP_IBCC_MARKER)
355 && (buffer[0] & 0xc0) != 0x80)
357 if ((opcode[j].format & M6812_OP_TBCC_MARKER)
358 && (buffer[0] & 0xc0) != 0x40)
360 if ((opcode[j].format & M6812_OP_DBCC_MARKER)
361 && (buffer[0] & 0xc0) != 0)
363 if ((opcode[j].format & M6812_OP_EQ_MARKER)
364 && (buffer[0] & 0x20) == 0)
366 if (!(opcode[j].format & M6812_OP_EQ_MARKER)
367 && (buffer[0] & 0x20) != 0)
371 if (opcode[j].format & M6812_OP_EXG_MARKER && buffer[0] & 0x80)
373 if ((opcode[j].format & M6812_OP_SEX_MARKER)
374 && (((buffer[0] & 0x07) >= 3 && (buffer[0] & 7) <= 7))
375 && ((buffer[0] & 0x0f0) <= 0x20))
377 if (opcode[j].format & M6812_OP_TFR_MARKER
378 && !(buffer[0] & 0x80))
381 if (i + j < m68hc11_num_opcodes)
385 /* We have found the opcode. Extract the operand and print it. */
386 (*info->fprintf_func) (info->stream, "%s", opcode->name);
388 format = opcode->format;
389 if (format & (M6811_OP_MASK | M6811_OP_BITMASK
390 | M6811_OP_JUMP_REL | M6812_OP_JUMP_REL16))
392 (*info->fprintf_func) (info->stream, "\t");
395 /* The movb and movw must be handled in a special way...
396 The source constant 'ii' is not always at the same place.
397 This is the same for the destination for the post-indexed byte.
398 The 'offset' is used to do the appropriate correction.
401 for constant for destination
402 movb 18 OB ii hh ll 0 0
404 18 0C hh ll hh ll 0 0
409 movw 18 03 jj kk hh ll 0 0
411 18 04 hh ll hh ll 0 0
416 After the source operand is read, the position 'pos' is incremented
417 this explains the negative offset for destination.
419 movb/movw above are the only instructions with this matching
421 offset = ((format & M6812_OP_IDX_P2)
422 && (format & (M6811_OP_IMM8 | M6811_OP_IMM16 |
425 /* Operand with one more byte: - immediate, offset,
426 direct-low address. */
428 (M6811_OP_IMM8 | M6811_OP_IX | M6811_OP_IY | M6811_OP_DIRECT))
430 status = read_memory (memaddr + pos + offset, &buffer[0], 1, info);
438 /* This movb/movw is special (see above). */
442 if (format & M6811_OP_IMM8)
444 (*info->fprintf_func) (info->stream, "#%d", (int) buffer[0]);
445 format &= ~M6811_OP_IMM8;
446 /* Set PC destination offset. */
449 else if (format & M6811_OP_IX)
451 /* Offsets are in range 0..255, print them unsigned. */
452 (*info->fprintf_func) (info->stream, "%u,x", buffer[0] & 0x0FF);
453 format &= ~M6811_OP_IX;
455 else if (format & M6811_OP_IY)
457 (*info->fprintf_func) (info->stream, "%u,y", buffer[0] & 0x0FF);
458 format &= ~M6811_OP_IY;
460 else if (format & M6811_OP_DIRECT)
462 (*info->fprintf_func) (info->stream, "*");
463 (*info->print_address_func) (buffer[0] & 0x0FF, info);
464 format &= ~M6811_OP_DIRECT;
468 #define M6812_DST_MOVE (M6812_OP_IND16_P2 | M6812_OP_IDX_P2)
469 #define M6812_INDEXED_FLAGS (M6812_OP_IDX|M6812_OP_IDX_1|M6812_OP_IDX_2)
470 /* Analyze the 68HC12 indexed byte. */
471 if (format & M6812_INDEXED_FLAGS)
476 endaddr = memaddr + pos + 1;
477 if (format & M6811_OP_IND16)
481 status = print_indexed_operand (memaddr + pos, info, &indirect,
482 (format & M6812_DST_MOVE),
483 pc_src_offset, endaddr);
490 /* The indirect addressing mode of the call instruction does
491 not need the page code. */
492 if ((format & M6812_OP_PAGE) && indirect)
493 format &= ~M6812_OP_PAGE;
496 /* 68HC12 dbcc/ibcc/tbcc operands. */
497 if ((format & M6812_OP_REG) && (format & M6811_OP_JUMP_REL))
499 status = read_memory (memaddr + pos, &buffer[0], 2, info);
504 (*info->fprintf_func) (info->stream, "%s,",
505 reg_src_table[buffer[0] & 0x07]);
506 sval = buffer[1] & 0x0ff;
507 if (buffer[0] & 0x10)
511 (*info->print_address_func) (memaddr + pos + sval, info);
512 format &= ~(M6812_OP_REG | M6811_OP_JUMP_REL);
514 else if (format & (M6812_OP_REG | M6812_OP_REG_2))
516 status = read_memory (memaddr + pos, &buffer[0], 1, info);
523 (*info->fprintf_func) (info->stream, "%s,%s",
524 reg_src_table[(buffer[0] >> 4) & 7],
525 reg_dst_table[(buffer[0] & 7)]);
528 if (format & (M6811_OP_IMM16 | M6811_OP_IND16))
534 status = read_memory (memaddr + pos + offset, &buffer[0], 2, info);
539 if (format & M6812_OP_IDX_P2)
545 val = ((buffer[0] << 8) | (buffer[1] & 0x0FF));
549 if (format & M6812_OP_PAGE)
551 status = read_memory (memaddr + pos + offset, buffer, 1, info);
555 page = (unsigned) buffer[0];
556 if (addr >= M68HC12_BANK_BASE && addr < 0x0c000)
557 addr = ((val - M68HC12_BANK_BASE)
558 | (page << M68HC12_BANK_SHIFT))
561 else if ((arch & cpu6812)
562 && addr >= M68HC12_BANK_BASE && addr < 0x0c000)
567 if (memaddr >= M68HC12_BANK_VIRT)
568 cur_page = ((memaddr - M68HC12_BANK_VIRT)
569 >> M68HC12_BANK_SHIFT);
573 vaddr = ((addr - M68HC12_BANK_BASE)
574 + (cur_page << M68HC12_BANK_SHIFT))
576 if (!info->symbol_at_address_func (addr, info)
577 && info->symbol_at_address_func (vaddr, info))
580 if (format & M6811_OP_IMM16)
582 format &= ~M6811_OP_IMM16;
583 (*info->fprintf_func) (info->stream, "#");
586 format &= ~M6811_OP_IND16;
588 (*info->print_address_func) (addr, info);
589 if (format & M6812_OP_PAGE)
591 (* info->fprintf_func) (info->stream, " {");
592 (* info->print_address_func) (val, info);
593 (* info->fprintf_func) (info->stream, ", %d}", page);
594 format &= ~M6812_OP_PAGE;
599 if (format & M6812_OP_IDX_P2)
601 (*info->fprintf_func) (info->stream, ", ");
602 status = print_indexed_operand (memaddr + pos + offset, info,
604 memaddr + pos + offset + 1);
610 if (format & M6812_OP_IND16_P2)
614 (*info->fprintf_func) (info->stream, ", ");
616 status = read_memory (memaddr + pos + offset, &buffer[0], 2, info);
623 val = ((buffer[0] << 8) | (buffer[1] & 0x0FF));
625 (*info->print_address_func) (val, info);
628 /* M6811_OP_BITMASK and M6811_OP_JUMP_REL must be treated separately
629 and in that order. The brset/brclr insn have a bitmask and then
630 a relative branch offset. */
631 if (format & M6811_OP_BITMASK)
633 status = read_memory (memaddr + pos, &buffer[0], 1, info);
639 (*info->fprintf_func) (info->stream, " #$%02x%s",
641 (format & M6811_OP_JUMP_REL ? " " : ""));
642 format &= ~M6811_OP_BITMASK;
644 if (format & M6811_OP_JUMP_REL)
648 status = read_memory (memaddr + pos, &buffer[0], 1, info);
655 val = (buffer[0] & 0x80) ? buffer[0] | 0xFFFFFF00 : buffer[0];
656 (*info->print_address_func) (memaddr + pos + val, info);
657 format &= ~M6811_OP_JUMP_REL;
659 else if (format & M6812_OP_JUMP_REL16)
663 status = read_memory (memaddr + pos, &buffer[0], 2, info);
670 val = ((buffer[0] << 8) | (buffer[1] & 0x0FF));
674 (*info->print_address_func) (memaddr + pos + val, info);
675 format &= ~M6812_OP_JUMP_REL16;
678 if (format & M6812_OP_PAGE)
682 status = read_memory (memaddr + pos + offset, &buffer[0], 1, info);
689 val = buffer[0] & 0x0ff;
690 (*info->fprintf_func) (info->stream, ", %d", val);
694 /* Consistency check. 'format' must be 0, so that we have handled
695 all formats; and the computed size of the insn must match the
696 opcode table content. */
697 if (format & ~(M6811_OP_PAGE4 | M6811_OP_PAGE3 | M6811_OP_PAGE2))
699 (*info->fprintf_func) (info->stream, "; Error, format: %lx", format);
701 if (pos != opcode->size)
703 (*info->fprintf_func) (info->stream, "; Error, size: %ld expect %d",
710 /* Opcode not recognized. */
711 if (format == M6811_OP_PAGE2 && arch & cpu6812
712 && ((code >= 0x30 && code <= 0x39) || (code >= 0x40)))
713 (*info->fprintf_func) (info->stream, "trap\t#%d", code & 0x0ff);
715 else if (format == M6811_OP_PAGE2)
716 (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
717 M6811_OPCODE_PAGE2, code);
718 else if (format == M6811_OP_PAGE3)
719 (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
720 M6811_OPCODE_PAGE3, code);
721 else if (format == M6811_OP_PAGE4)
722 (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
723 M6811_OPCODE_PAGE4, code);
725 (*info->fprintf_func) (info->stream, ".byte\t0x%02x", code);
730 /* Disassemble one instruction at address 'memaddr'. Returns the number
731 of bytes used by that instruction. */
733 print_insn_m68hc11 (bfd_vma memaddr, struct disassemble_info* info)
735 return print_insn (memaddr, info, cpu6811);
739 print_insn_m68hc12 (bfd_vma memaddr, struct disassemble_info* info)
741 return print_insn (memaddr, info, cpu6812);