Mercurial > repos > blastem
annotate 68kinst.c @ 2:5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
author | Mike Pavone <pavone@retrodev.com> |
---|---|
date | Sat, 03 Nov 2012 21:38:28 -0700 |
parents | 2432d177e1ac |
children | a4ad0e3e3e0e |
rev | line source |
---|---|
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1 #include "68kinst.h" |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
2 #include <string.h> |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
3 #include <stdio.h> |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
4 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
5 uint32_t sign_extend16(uint32_t val) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
6 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
7 return (val & 0x8000) ? val | 0xFFFF0000 : val; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
8 } |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
9 |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
10 uint32_t sign_extend8(uint32_t val) |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
11 { |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
12 return (val & 0x80) ? val | 0xFFFFFF00 : val; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
13 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
14 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
15 uint16_t *m68k_decode_op_ex(uint16_t *cur, uint8_t mode, uint8_t reg, uint8_t size, m68k_op_info *dst) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
16 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
17 uint16_t ext; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
18 dst->addr_mode = mode; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
19 switch(mode) |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
20 { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
21 case MODE_REG: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
22 case MODE_AREG: |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
23 case MODE_AREG_INDIRECT: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
24 case MODE_AREG_POSTINC: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
25 case MODE_AREG_PREDEC: |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
26 dst->params.regs.pri = reg; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
27 break; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
28 case MODE_AREG_DISPLACE: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
29 ext = *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
30 dst->params.regs.pri = reg; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
31 dst->params.regs.displacement = sign_extend16(ext); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
32 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
33 case MODE_AREG_INDEX_MEM: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
34 //TODO: implement me |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
35 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
36 case MODE_PC_INDIRECT_ABS_IMMED: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
37 switch(reg) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
38 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
39 case 0: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
40 dst->addr_mode = MODE_ABSOLUTE_SHORT; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
41 ext = *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
42 dst->params.u32 = sign_extend16(ext); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
43 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
44 case 1: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
45 dst->addr_mode = MODE_ABSOLUTE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
46 ext = *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
47 dst->params.u32 = ext << 16 | *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
48 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
49 case 2: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
50 dst->addr_mode = MODE_PC_DISPLACE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
51 ext = *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
52 dst->params.regs.displacement = sign_extend16(ext); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
53 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
54 case 4: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
55 dst->addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
56 ext = *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
57 switch (size) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
58 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
59 case OPSIZE_BYTE: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
60 dst->params.u8 = ext; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
61 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
62 case OPSIZE_WORD: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
63 dst->params.u16 = ext; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
64 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
65 case OPSIZE_LONG: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
66 dst->params.u32 = ext << 16 | *(++cur); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
67 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
68 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
69 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
70 //TODO: implement the rest of these |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
71 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
72 break; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
73 } |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
74 return cur; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
75 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
76 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
77 uint16_t *m68k_decode_op(uint16_t *cur, uint8_t size, m68k_op_info *dst) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
78 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
79 uint8_t mode = (*cur >> 3) & 0x7; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
80 uint8_t reg = *cur & 0x7; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
81 return m68k_decode_op_ex(cur, mode, reg, size, dst); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
82 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
83 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
84 void m68k_decode_cond(uint16_t op, m68kinst * decoded) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
85 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
86 decoded->extra.cond = (op >> 0x8) & 0xF; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
87 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
88 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
89 uint8_t m68K_reg_quick_field(uint16_t op) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
90 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
91 return (op >> 9) & 0x7; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
92 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
93 |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
94 uint16_t * m68K_decode(uint16_t * istream, m68kinst * decoded) |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
95 { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
96 uint8_t optype = *istream >> 12; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
97 uint8_t size; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
98 uint32_t immed; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
99 decoded->op = M68K_INVALID; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
100 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_UNUSED; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
101 decoded->variant = VAR_NORMAL; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
102 switch(optype) |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
103 { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
104 case BIT_MOVEP_IMMED: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
105 //TODO: Implement me |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
106 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
107 case MOVE_BYTE: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
108 case MOVE_LONG: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
109 case MOVE_WORD: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
110 decoded->op = M68K_MOVE; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
111 decoded->extra.size = optype == MOVE_BYTE ? OPSIZE_BYTE : (optype == MOVE_WORD ? OPSIZE_WORD : OPSIZE_LONG); |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
112 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
113 istream = m68k_decode_op_ex(istream, (*istream >> 6) & 0x7, m68K_reg_quick_field(*istream), decoded->extra.size, &(decoded->dst)); |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
114 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
115 case MISC: |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
116 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
117 if ((*istream & 0x1C0) == 0x1C0) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
118 decoded->op = M68K_LEA; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
119 decoded->extra.size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
120 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
121 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
122 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
123 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
124 if (*istream & 0x100) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
125 decoded->op = M68K_CHK; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
126 if ((*istream & 0x180) == 0x180) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
127 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
128 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
129 //only on M68020+ |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
130 decoded->extra.size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
131 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
132 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
133 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
134 decoded->dst.addr_mode = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
135 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
136 optype = (*istream >> 9) & 0x7; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
137 switch(optype) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
138 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
139 case 0: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
140 //Move from SR or NEGX |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
141 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
142 case 1: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
143 //MOVE from CCR or CLR |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
144 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
145 case 2: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
146 //MOVE to CCR or NEG |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
147 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
148 case 3: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
149 //MOVE to SR or NOT |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
150 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
151 case 4: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
152 //EXT, EXTB, LINK.l, NBCD, SWAP, BKPT, PEA, MOVEM |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
153 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
154 case 5: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
155 //BGND, ILLEGAL, TAS, TST |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
156 optype = *istream & 0xFF; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
157 if (optype == 0xFA) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
158 //BGND - CPU32 only |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
159 } else if (optype == 0xFC) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
160 decoded->op = M68K_ILLEGAL; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
161 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
162 size = (*istream & 0xC0) >> 6; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
163 if (size == OPSIZE_INVALID) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
164 decoded->op = M68K_TAS; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
165 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
166 decoded->op = M68K_TST; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
167 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
168 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
169 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
170 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
171 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
172 case 6: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
173 //MULU, MULS, DIVU, DIVUL, DIVS, DIVSL, MOVEM |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
174 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
175 case 7: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
176 //TRAP, LINK.w, UNLNK, MOVE USP, RESET, NOP, STOP, RTE, RTD, RTS, TRAPV, RTR, MOVEC, JSR, JMP |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
177 if (*istream & 0x80) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
178 //JSR, JMP |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
179 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
180 //it would appear bit 6 needs to be set for it to be a valid instruction here |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
181 switch((*istream >> 3) & 0x7) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
182 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
183 case 0: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
184 case 1: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
185 //TRAP |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
186 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
187 case 2: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
188 //LINK.w |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
189 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
190 case 3: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
191 //UNLNK |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
192 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
193 case 4: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
194 case 5: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
195 //MOVE USP |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
196 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
197 case 6: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
198 switch(*istream & 0x7) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
199 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
200 case 0: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
201 decoded->op = M68K_RESET; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
202 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
203 case 1: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
204 decoded->op = M68K_NOP; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
205 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
206 case 2: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
207 decoded->op = M68K_STOP; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
208 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
209 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
210 decoded->src.params.u16 =*(++istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
211 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
212 case 3: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
213 decoded->op = M68K_RTE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
214 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
215 case 4: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
216 #ifdef M68010 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
217 decoded->op = M68K_RTD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
218 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
219 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
220 decoded->src.params.u16 =*(++istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
221 #endif |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
222 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
223 case 5: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
224 decoded->op = M68K_RTS; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
225 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
226 case 6: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
227 decoded->op = M68K_TRAPV; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
228 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
229 case 7: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
230 decoded->op = M68K_RTR; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
231 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
232 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
233 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
234 case 7: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
235 //MOVEC |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
236 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
237 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
238 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
239 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
240 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
241 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
242 } |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
243 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
244 case QUICK_ARITH_LOOP: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
245 size = (*istream >> 6) & 3; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
246 if (size == 0x3) { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
247 //DBcc, TRAPcc or Scc |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
248 m68k_decode_cond(*istream, decoded); |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
249 switch ((*istream >> 3) & 0x7) |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
250 { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
251 case 1: //DBcc |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
252 decoded->op = M68K_DBCC; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
253 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
254 decoded->src.params.u16 = *(++istream); |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
255 decoded->dst.addr_mode = MODE_REG; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
256 decoded->dst.params.regs.pri = *istream & 0x7; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
257 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
258 case 7: //TRAPcc |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
259 #ifdef M68020 |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
260 decoded->op = M68K_TRAPCC; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
261 decoded->src.addr_mode = MODE_IMMEDIATE; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
262 //TODO: Figure out what to do with OPMODE and optional extention words |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
263 #endif |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
264 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
265 default: //Scc |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
266 decoded->op = M68K_SCC; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
267 istream = m68k_decode_op(istream, OPSIZE_BYTE, &(decoded->dst)); |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
268 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
269 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
270 } else { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
271 //ADDQ, SUBQ |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
272 decoded->variant = VAR_QUICK; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
273 decoded->extra.size = size; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
274 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
275 istream = m68k_decode_op(istream, size, &(decoded->dst)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
276 immed = m68K_reg_quick_field(*istream); |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
277 if (!immed) { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
278 immed = 8; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
279 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
280 switch (size) |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
281 { |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
282 case OPSIZE_BYTE: |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
283 decoded->src.params.u8 = immed; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
284 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
285 case OPSIZE_WORD: |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
286 decoded->src.params.u16 = immed; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
287 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
288 case OPSIZE_LONG: |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
289 decoded->src.params.u32 = immed; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
290 break; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
291 } |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
292 if (*istream & 0x100) { |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
293 decoded->op = M68K_SUB; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
294 } else { |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
295 decoded->op = M68K_ADD; |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
296 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
297 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
298 break; |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
299 case BRANCH: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
300 m68k_decode_cond(*istream, decoded); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
301 decoded->op = decoded->extra.cond == COND_FALSE ? M68K_BSR : M68K_BCC; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
302 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
303 immed = *istream & 0xFF; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
304 if (immed == 0) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
305 decoded->variant = VAR_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
306 immed = *(++istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
307 immed = sign_extend16(immed); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
308 } else if (immed == 0xFF) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
309 decoded->variant = VAR_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
310 immed = *(++istream) << 16; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
311 immed |= *(++istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
312 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
313 decoded->variant = VAR_BYTE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
314 immed = sign_extend8(immed); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
315 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
316 decoded->src.params.u32 = immed; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
317 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
318 case MOVEQ: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
319 decoded->op = M68K_MOVE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
320 decoded->variant = VAR_QUICK; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
321 decoded->src.addr_mode = MODE_IMMEDIATE; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
322 decoded->src.params.u32 = sign_extend8(*istream & 0xFF); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
323 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
324 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
325 immed = *istream & 0xFF; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
326 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
327 case OR_DIV_SBCD: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
328 //TODO: Implement me |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
329 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
330 case SUB_SUBX: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
331 size = *istream >> 6 & 0x3; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
332 decoded->op = M68K_SUB; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
333 if (*istream & 0x100) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
334 //<ea> destination, SUBA.l or SUBX |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
335 if (*istream & 0x6) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
336 if (size == OPSIZE_INVALID) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
337 //SUBA.l |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
338 decoded->extra.size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
339 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
340 istream = m68k_decode_op(istream, OPSIZE_LONG, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
341 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
342 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
343 decoded->src.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
344 istream = m68k_decode_op(istream, size, &(decoded->dst)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
345 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
346 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
347 //SUBX |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
348 decoded->op = M68K_SUBX; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
349 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
350 istream = m68k_decode_op(istream, size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
351 decoded->dst.addr_mode = decoded->src.addr_mode; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
352 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
353 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
354 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
355 if (size == OPSIZE_INVALID) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
356 //SUBA.w |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
357 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
358 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
359 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
360 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
361 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
362 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
363 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
364 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
365 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
366 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
367 case RESERVED: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
368 //TODO: implement me |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
369 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
370 case CMP_XOR: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
371 size = *istream >> 6 & 0x3; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
372 decoded->op = M68K_CMP; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
373 if (*istream & 0x100) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
374 //CMPM or EOR |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
375 istream = m68k_decode_op(istream, size, &(decoded->dst)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
376 if (decoded->src.addr_mode == MODE_AREG) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
377 //CMPM |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
378 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_AREG_POSTINC; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
379 decoded->src.params.regs.pri = decoded->dst.params.regs.pri; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
380 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
381 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
382 //EOR |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
383 decoded->op = M68K_EOR; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
384 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
385 decoded->src.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
386 decoded->src.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
387 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
388 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
389 //CMP |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
390 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
391 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
392 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
393 istream = m68k_decode_op(istream, size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
394 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
395 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
396 case AND_MUL_ABCD_EXG: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
397 //page 575 for summary |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
398 //EXG opmodes: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
399 //01000 -data regs |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
400 //01001 -addr regs |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
401 //10001 -one of each |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
402 //AND opmodes: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
403 //operand order bit + 2 size bits (00 - 10) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
404 //no address register direct addressing |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
405 //data register direct not allowed when <ea> is the source (operand order bit of 1) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
406 if (*istream & 0x100) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
407 if ((*istream & 0xC0) == 0xC0) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
408 decoded->op = M68K_MULS; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
409 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
410 istream = m68k_decode_op(istream, OPSIZE_WORD, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
411 } else if(!(*istream & 0xF0)) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
412 decoded->op = M68K_ABCD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
413 } else if(!(*istream & 0x30)) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
414 decoded->op = M68K_EXG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
415 decoded->extra.size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
416 decoded->src.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
417 decoded->dst.params.regs.pri = *istream & 0x7; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
418 if (*istream & 0x8) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
419 if (*istream & 0x80) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
420 decoded->src.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
421 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
422 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
423 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
424 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
425 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
426 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
427 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
428 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
429 decoded->op = M68K_AND; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
430 decoded->extra.size = (*istream >> 6); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
431 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
432 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
433 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
434 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
435 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
436 if ((*istream & 0xC0) == 0xC0) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
437 decoded->op = M68K_MULU; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
438 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
439 istream = m68k_decode_op(istream, OPSIZE_WORD, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
440 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
441 decoded->op = M68K_AND; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
442 decoded->extra.size = (*istream >> 6); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
443 decoded->src.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
444 decoded->src.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
445 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->dst)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
446 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
447 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
448 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
449 case ADD_ADDX: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
450 size = *istream >> 6 & 0x3; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
451 decoded->op = M68K_ADD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
452 if (*istream & 0x100) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
453 //<ea> destination, ADDA.l or ADDX |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
454 if (*istream & 0x6) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
455 if (size == OPSIZE_INVALID) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
456 //ADDA.l |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
457 decoded->extra.size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
458 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
459 istream = m68k_decode_op(istream, OPSIZE_LONG, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
460 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
461 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
462 decoded->src.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
463 istream = m68k_decode_op(istream, size, &(decoded->dst)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
464 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
465 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
466 //ADDX |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
467 decoded->op = M68K_ADDX; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
468 //FIXME: Size is not technically correct |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
469 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
470 istream = m68k_decode_op(istream, size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
471 decoded->dst.addr_mode = decoded->src.addr_mode; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
472 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
473 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
474 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
475 if (size == OPSIZE_INVALID) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
476 //ADDA.w |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
477 decoded->extra.size = OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
478 decoded->dst.addr_mode = MODE_AREG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
479 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
480 decoded->extra.size = size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
481 decoded->dst.addr_mode = MODE_REG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
482 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
483 decoded->dst.params.regs.pri = m68K_reg_quick_field(*istream); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
484 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
485 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
486 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
487 case SHIFT_ROTATE: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
488 //TODO: Implement me |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
489 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
490 case COPROC: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
491 //TODO: Implement me |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
492 break; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
493 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
494 return istream+1; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
495 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
496 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
497 char * mnemonics[] = { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
498 "abcd", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
499 "add", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
500 "addx", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
501 "and", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
502 "andi_ccr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
503 "andi_sr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
504 "asl", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
505 "asr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
506 "bcc", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
507 "bchg", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
508 "bclr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
509 "bset", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
510 "bsr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
511 "btst", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
512 "chk", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
513 "clr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
514 "cmp", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
515 "dbcc", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
516 "divs", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
517 "divu", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
518 "eor", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
519 "eori_ccr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
520 "eori_sr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
521 "exg", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
522 "ext", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
523 "illegal", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
524 "jmp", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
525 "jsr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
526 "lea", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
527 "link", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
528 "lsl", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
529 "lsr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
530 "move", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
531 "move_ccr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
532 "move_from_sr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
533 "move_sr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
534 "move_usp", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
535 "movem", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
536 "movep", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
537 "muls", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
538 "mulu", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
539 "nbcd", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
540 "neg", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
541 "negx", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
542 "nop", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
543 "not", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
544 "or", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
545 "ori_ccr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
546 "ori_sr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
547 "pea", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
548 "reset", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
549 "rol", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
550 "ror", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
551 "roxl", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
552 "roxr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
553 "rte", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
554 "rtr", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
555 "rts", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
556 "sbcd", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
557 "scc", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
558 "stop", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
559 "sub", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
560 "subx", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
561 "swap", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
562 "tas", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
563 "trap", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
564 "trapv", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
565 "tst", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
566 "unlnk", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
567 "invalid" |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
568 }; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
569 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
570 char * cond_mnem[] = { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
571 "ra", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
572 "f", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
573 "hi", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
574 "ls", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
575 "cc", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
576 "cs", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
577 "ne", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
578 "eq", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
579 "vc", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
580 "vs", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
581 "pl", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
582 "mi", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
583 "ge", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
584 "lt", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
585 "gt", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
586 "le" |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
587 }; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
588 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
589 int m68K_disasm_op(m68k_op_info *decoded, uint8_t size, char *dst, int need_comma) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
590 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
591 char * c = need_comma ? "," : ""; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
592 switch(decoded->addr_mode) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
593 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
594 case MODE_REG: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
595 return sprintf(dst, "%s d%d", c, decoded->params.regs.pri); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
596 case MODE_AREG: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
597 return sprintf(dst, "%s a%d", c, decoded->params.regs.pri); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
598 case MODE_AREG_INDIRECT: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
599 return sprintf(dst, "%s (a%d)", c, decoded->params.regs.pri); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
600 case MODE_AREG_POSTINC: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
601 return sprintf(dst, "%s (a%d)+", c, decoded->params.regs.pri); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
602 case MODE_AREG_PREDEC: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
603 return sprintf(dst, "%s -(a%d)", c, decoded->params.regs.pri); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
604 case MODE_IMMEDIATE: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
605 return sprintf(dst, "%s #%d", c, size == OPSIZE_LONG ? decoded->params.u32 : (size == OPSIZE_WORD ? decoded->params.u16 : decoded->params.u8)); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
606 default: |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
607 return 0; |
0
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
608 } |
2432d177e1ac
Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
609 } |
2
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
610 |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
611 int m68k_disasm(m68kinst * decoded, char * dst) |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
612 { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
613 int ret,op1len; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
614 uint8_t size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
615 if (decoded->op == M68K_BCC || decoded->op == M68K_DBCC || decoded->op == M68K_SCC) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
616 ret = strlen(mnemonics[decoded->op]) - 2; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
617 memcpy(dst, mnemonics[decoded->op], ret); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
618 dst[ret] = 0; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
619 strcat(dst, cond_mnem[decoded->extra.cond]); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
620 ret = strlen(dst); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
621 size = decoded->op = M68K_BCC ? OPSIZE_LONG : OPSIZE_WORD; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
622 } else if (decoded->op == M68K_BSR) { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
623 size = OPSIZE_LONG; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
624 ret = sprintf(dst, "bsr%s", decoded->variant == VAR_BYTE ? ".s" : ""); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
625 } else { |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
626 size = decoded->extra.size; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
627 ret = sprintf(dst, "%s%s.%c", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
628 mnemonics[decoded->op], |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
629 decoded->variant == VAR_QUICK ? "q" : "", |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
630 decoded->extra.size == OPSIZE_BYTE ? 'b' : (size == OPSIZE_WORD ? 'w' : 'l')); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
631 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
632 op1len = m68K_disasm_op(&(decoded->src), size, dst + ret, 0); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
633 ret += op1len; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
634 ret += m68K_disasm_op(&(decoded->dst), size, dst + ret, op1len); |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
635 return ret; |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
636 } |
5df303bf72e6
Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
0
diff
changeset
|
637 |