1 /* m68hc11-dis.c -- Motorola 68HC11 & 68HC12 disassembly
2 Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
3 Written by Stephane Carrez (stcarrez@worldnet.fr)
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "opcode/m68hc11.h"
25 static const char *const reg_name
[] = {
29 static const char *const reg_src_table
[] = {
30 "A", "B", "CCR", "TMP3", "D", "X", "Y", "SP"
33 static const char *const reg_dst_table
[] = {
34 "A", "B", "CCR", "TMP2", "D", "X", "Y", "SP"
37 #define OP_PAGE_MASK (M6811_OP_PAGE2|M6811_OP_PAGE3|M6811_OP_PAGE4)
39 /* Prototypes for local functions. */
40 static int read_memory
41 PARAMS ((bfd_vma
, bfd_byte
*, int, struct disassemble_info
*));
42 static int print_indexed_operand
43 PARAMS ((bfd_vma
, struct disassemble_info
*, int));
45 PARAMS ((bfd_vma
, struct disassemble_info
*, int));
48 read_memory (memaddr
, buffer
, size
, info
)
52 struct disassemble_info
*info
;
56 /* Get first byte. Only one at a time because we don't know the
58 status
= (*info
->read_memory_func
) (memaddr
, buffer
, size
, info
);
61 (*info
->memory_error_func
) (status
, memaddr
, info
);
68 /* Read the 68HC12 indexed operand byte and print the corresponding mode.
69 Returns the number of bytes read or -1 if failure. */
71 print_indexed_operand (memaddr
, info
, mov_insn
)
73 struct disassemble_info
*info
;
82 status
= read_memory (memaddr
, &buffer
[0], 1, info
);
88 /* n,r with 5-bits signed constant. */
89 if ((buffer
[0] & 0x20) == 0)
91 reg
= (buffer
[0] >> 6) & 3;
92 sval
= (buffer
[0] & 0x1f);
95 (*info
->fprintf_func
) (info
->stream
, "%d,%s",
96 (int) sval
, reg_name
[reg
]);
99 /* Auto pre/post increment/decrement. */
100 else if ((buffer
[0] & 0xc0) != 0xc0)
104 reg
= (buffer
[0] >> 6) & 3;
105 sval
= (buffer
[0] & 0x0f);
117 (*info
->fprintf_func
) (info
->stream
, "%d,%s%s%s",
119 (buffer
[0] & 0x10 ? "" : mode
),
120 reg_name
[reg
], (buffer
[0] & 0x10 ? mode
: ""));
123 /* [n,r] 16-bits offset indexed indirect. */
124 else if ((buffer
[0] & 0x07) == 3)
128 (*info
->fprintf_func
) (info
->stream
, "<invalid op: 0x%x>",
132 reg
= (buffer
[0] >> 3) & 0x03;
133 status
= read_memory (memaddr
+ pos
, &buffer
[0], 2, info
);
140 sval
= ((buffer
[0] << 8) | (buffer
[1] & 0x0FF));
141 (*info
->fprintf_func
) (info
->stream
, "[%u,%s]",
142 sval
& 0x0ffff, reg_name
[reg
]);
144 else if ((buffer
[0] & 0x4) == 0)
148 (*info
->fprintf_func
) (info
->stream
, "<invalid op: 0x%x>",
152 reg
= (buffer
[0] >> 3) & 0x03;
153 status
= read_memory (memaddr
+ pos
,
154 &buffer
[1], (buffer
[0] & 0x2 ? 2 : 1), info
);
161 sval
= ((buffer
[1] << 8) | (buffer
[2] & 0x0FF));
167 sval
= buffer
[1] & 0x00ff;
168 if (buffer
[0] & 0x01)
172 (*info
->fprintf_func
) (info
->stream
, "%d,%s",
173 (int) sval
, reg_name
[reg
]);
177 reg
= (buffer
[0] >> 3) & 0x03;
178 switch (buffer
[0] & 3)
181 (*info
->fprintf_func
) (info
->stream
, "A,%s", reg_name
[reg
]);
184 (*info
->fprintf_func
) (info
->stream
, "B,%s", reg_name
[reg
]);
187 (*info
->fprintf_func
) (info
->stream
, "D,%s", reg_name
[reg
]);
191 (*info
->fprintf_func
) (info
->stream
, "[D,%s]", reg_name
[reg
]);
199 /* Disassemble one instruction at address 'memaddr'. Returns the number
200 of bytes used by that instruction. */
202 print_insn (memaddr
, info
, arch
)
204 struct disassemble_info
*info
;
212 const struct m68hc11_opcode
*opcode
;
214 /* Get first byte. Only one at a time because we don't know the
216 status
= read_memory (memaddr
, buffer
, 1, info
);
226 /* Look for page2,3,4 opcodes. */
227 if (code
== M6811_OPCODE_PAGE2
)
230 format
= M6811_OP_PAGE2
;
232 else if (code
== M6811_OPCODE_PAGE3
&& arch
== cpu6811
)
235 format
= M6811_OP_PAGE3
;
237 else if (code
== M6811_OPCODE_PAGE4
&& arch
== cpu6811
)
240 format
= M6811_OP_PAGE4
;
243 /* We are in page2,3,4; get the real opcode. */
246 status
= read_memory (memaddr
+ pos
, &buffer
[1], 1, info
);
255 /* Look first for a 68HC12 alias. All of them are 2-bytes long and
256 in page 1. There is no operand to print. We read the second byte
257 only when we have a possible match. */
258 if ((arch
& cpu6812
) && format
== 0)
262 /* Walk the alias table to find a code1+code2 match. */
263 for (i
= 0; i
< m68hc12_num_alias
; i
++)
265 if (m68hc12_alias
[i
].code1
== code
)
269 status
= read_memory (memaddr
+ pos
+ 1,
270 &buffer
[1], 1, info
);
276 if (m68hc12_alias
[i
].code2
== (unsigned char) buffer
[1])
278 (*info
->fprintf_func
) (info
->stream
, "%s",
279 m68hc12_alias
[i
].name
);
288 /* Scan the opcode table until we find the opcode
289 with the corresponding page. */
290 opcode
= m68hc11_opcodes
;
291 for (i
= 0; i
< m68hc11_num_opcodes
; i
++, opcode
++)
295 if ((opcode
->arch
& arch
) == 0)
297 if (opcode
->opcode
!= code
)
299 if ((opcode
->format
& OP_PAGE_MASK
) != format
)
302 if (opcode
->format
& M6812_OP_REG
)
307 if (opcode
->format
& M6811_OP_JUMP_REL
)
312 status
= read_memory (memaddr
+ pos
, &buffer
[0], 1, info
);
317 for (j
= 0; i
+ j
< m68hc11_num_opcodes
; j
++)
319 if ((opcode
[j
].arch
& arch
) == 0)
321 if (opcode
[j
].opcode
!= code
)
325 if (!(opcode
[j
].format
& M6811_OP_JUMP_REL
))
328 if ((opcode
[j
].format
& M6812_OP_IBCC_MARKER
)
329 && (buffer
[0] & 0xc0) != 0x80)
331 if ((opcode
[j
].format
& M6812_OP_TBCC_MARKER
)
332 && (buffer
[0] & 0xc0) != 0x40)
334 if ((opcode
[j
].format
& M6812_OP_DBCC_MARKER
)
335 && (buffer
[0] & 0xc0) != 0)
337 if ((opcode
[j
].format
& M6812_OP_EQ_MARKER
)
338 && (buffer
[0] & 0x20) == 0)
340 if (!(opcode
[j
].format
& M6812_OP_EQ_MARKER
)
341 && (buffer
[0] & 0x20) != 0)
345 if (opcode
[j
].format
& M6812_OP_EXG_MARKER
&& buffer
[0] & 0x80)
347 if ((opcode
[j
].format
& M6812_OP_SEX_MARKER
)
348 && (((buffer
[0] & 0x07) >= 3 && (buffer
[0] & 7) <= 7))
349 && ((buffer
[0] & 0x0f0) <= 0x20))
351 if (opcode
[j
].format
& M6812_OP_TFR_MARKER
352 && !(buffer
[0] & 0x80))
355 if (i
+ j
< m68hc11_num_opcodes
)
359 /* We have found the opcode. Extract the operand and print it. */
360 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
362 format
= opcode
->format
;
363 if (format
& (M6811_OP_MASK
| M6811_OP_BITMASK
364 | M6811_OP_JUMP_REL
| M6812_OP_JUMP_REL16
))
366 (*info
->fprintf_func
) (info
->stream
, "\t");
369 /* The movb and movw must be handled in a special way...
370 The source constant 'ii' is not always at the same place.
371 This is the same for the destination for the post-indexed byte.
372 The 'offset' is used to do the appropriate correction.
375 for constant for destination
376 movb 18 OB ii hh ll 0 0
378 18 0C hh ll hh ll 0 0
383 movw 18 03 jj kk hh ll 0 0
385 18 04 hh ll hh ll 0 0
390 After the source operand is read, the position 'pos' is incremented
391 this explains the negative offset for destination.
393 movb/movw above are the only instructions with this matching
395 offset
= ((format
& M6812_OP_IDX_P2
)
396 && (format
& (M6811_OP_IMM8
| M6811_OP_IMM16
|
399 /* Operand with one more byte: - immediate, offset,
400 direct-low address. */
402 (M6811_OP_IMM8
| M6811_OP_IX
| M6811_OP_IY
| M6811_OP_DIRECT
))
404 status
= read_memory (memaddr
+ pos
+ offset
, &buffer
[0], 1, info
);
412 /* This movb/movw is special (see above). */
415 if (format
& M6811_OP_IMM8
)
417 (*info
->fprintf_func
) (info
->stream
, "#%d", (int) buffer
[0]);
418 format
&= ~M6811_OP_IMM8
;
420 else if (format
& M6811_OP_IX
)
422 /* Offsets are in range 0..255, print them unsigned. */
423 (*info
->fprintf_func
) (info
->stream
, "%u,x", buffer
[0] & 0x0FF);
424 format
&= ~M6811_OP_IX
;
426 else if (format
& M6811_OP_IY
)
428 (*info
->fprintf_func
) (info
->stream
, "%u,y", buffer
[0] & 0x0FF);
429 format
&= ~M6811_OP_IY
;
431 else if (format
& M6811_OP_DIRECT
)
433 (*info
->fprintf_func
) (info
->stream
, "*");
434 (*info
->print_address_func
) (buffer
[0] & 0x0FF, info
);
435 format
&= ~M6811_OP_DIRECT
;
439 #define M6812_INDEXED_FLAGS (M6812_OP_IDX|M6812_OP_IDX_1|M6812_OP_IDX_2)
440 /* Analyze the 68HC12 indexed byte. */
441 if (format
& M6812_INDEXED_FLAGS
)
443 status
= print_indexed_operand (memaddr
+ pos
, info
, 0);
451 /* 68HC12 dbcc/ibcc/tbcc operands. */
452 if ((format
& M6812_OP_REG
) && (format
& M6811_OP_JUMP_REL
))
454 status
= read_memory (memaddr
+ pos
, &buffer
[0], 2, info
);
459 (*info
->fprintf_func
) (info
->stream
, "%s,",
460 reg_src_table
[buffer
[0] & 0x07]);
461 sval
= buffer
[1] & 0x0ff;
462 if (buffer
[0] & 0x10)
466 (*info
->print_address_func
) (memaddr
+ pos
+ sval
, info
);
467 format
&= ~(M6812_OP_REG
| M6811_OP_JUMP_REL
);
469 else if (format
& (M6812_OP_REG
| M6812_OP_REG_2
))
471 status
= read_memory (memaddr
+ pos
, &buffer
[0], 1, info
);
478 (*info
->fprintf_func
) (info
->stream
, "%s,%s",
479 reg_src_table
[(buffer
[0] >> 4) & 7],
480 reg_dst_table
[(buffer
[0] & 7)]);
483 /* M6811_OP_BITMASK and M6811_OP_JUMP_REL must be treated separately
484 and in that order. The brset/brclr insn have a bitmask and then
485 a relative branch offset. */
486 if (format
& M6811_OP_BITMASK
)
488 status
= read_memory (memaddr
+ pos
, &buffer
[0], 1, info
);
494 (*info
->fprintf_func
) (info
->stream
, " #$%02x%s",
496 (format
& M6811_OP_JUMP_REL
? " " : ""));
497 format
&= ~M6811_OP_BITMASK
;
499 if (format
& M6811_OP_JUMP_REL
)
503 status
= read_memory (memaddr
+ pos
, &buffer
[0], 1, info
);
510 val
= (buffer
[0] & 0x80) ? buffer
[0] | 0xFFFFFF00 : buffer
[0];
511 (*info
->print_address_func
) (memaddr
+ pos
+ val
, info
);
512 format
&= ~M6811_OP_JUMP_REL
;
514 else if (format
& M6812_OP_JUMP_REL16
)
518 status
= read_memory (memaddr
+ pos
, &buffer
[0], 2, info
);
525 val
= ((buffer
[0] << 8) | (buffer
[1] & 0x0FF));
529 (*info
->print_address_func
) (memaddr
+ pos
+ val
, info
);
530 format
&= ~M6812_OP_JUMP_REL16
;
532 if (format
& (M6811_OP_IMM16
| M6811_OP_IND16
))
536 status
= read_memory (memaddr
+ pos
+ offset
, &buffer
[0], 2, info
);
541 if (format
& M6812_OP_IDX_P2
)
547 val
= ((buffer
[0] << 8) | (buffer
[1] & 0x0FF));
549 if (format
& M6811_OP_IMM16
)
551 format
&= ~M6811_OP_IMM16
;
552 (*info
->fprintf_func
) (info
->stream
, "#");
555 format
&= ~M6811_OP_IND16
;
557 (*info
->print_address_func
) (val
, info
);
560 if (format
& M6812_OP_IDX_P2
)
562 (*info
->fprintf_func
) (info
->stream
, ", ");
563 status
= print_indexed_operand (memaddr
+ pos
+ offset
, info
, 1);
569 if (format
& M6812_OP_IND16_P2
)
573 (*info
->fprintf_func
) (info
->stream
, ", ");
575 status
= read_memory (memaddr
+ pos
+ offset
, &buffer
[0], 2, info
);
582 val
= ((buffer
[0] << 8) | (buffer
[1] & 0x0FF));
584 (*info
->print_address_func
) (val
, info
);
588 /* Consistency check. 'format' must be 0, so that we have handled
589 all formats; and the computed size of the insn must match the
590 opcode table content. */
591 if (format
& ~(M6811_OP_PAGE4
| M6811_OP_PAGE3
| M6811_OP_PAGE2
))
593 (*info
->fprintf_func
) (info
->stream
, "; Error, format: %x", format
);
595 if (pos
!= opcode
->size
)
597 (*info
->fprintf_func
) (info
->stream
, "; Error, size: %d expect %d",
604 /* Opcode not recognized. */
605 if (format
== M6811_OP_PAGE2
&& arch
& cpu6812
606 && ((code
>= 0x30 && code
<= 0x39) || (code
>= 0x40 && code
<= 0xff)))
607 (*info
->fprintf_func
) (info
->stream
, "trap\t#%d", code
& 0x0ff);
609 else if (format
== M6811_OP_PAGE2
)
610 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x, 0x%02x",
611 M6811_OPCODE_PAGE2
, code
);
612 else if (format
== M6811_OP_PAGE3
)
613 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x, 0x%02x",
614 M6811_OPCODE_PAGE3
, code
);
615 else if (format
== M6811_OP_PAGE4
)
616 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x, 0x%02x",
617 M6811_OPCODE_PAGE4
, code
);
619 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x", code
);
624 /* Disassemble one instruction at address 'memaddr'. Returns the number
625 of bytes used by that instruction. */
627 print_insn_m68hc11 (memaddr
, info
)
629 struct disassemble_info
*info
;
631 return print_insn (memaddr
, info
, cpu6811
);
635 print_insn_m68hc12 (memaddr
, info
)
637 struct disassemble_info
*info
;
639 return print_insn (memaddr
, info
, cpu6812
);
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