summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/ucom4/ucom4d.cpp
blob: 4b29439b5e987835599e254fbd8562ba97b4ab33 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
// license:BSD-3-Clause
// copyright-holders:hap
/*

  NEC uCOM-4 MCU family disassembler

*/

#include "emu.h"
#include "debugger.h"
#include "ucom4.h"


enum e_mnemonics
{
	mLI, mL, mLM, mLDI, mLDZ, mS, mTAL, mTLA,
	mX, mXI, mXD, mXM, mXMI, mXMD, mAD, mADC, mADS, mDAA, mDAS,
	mEXL, mCLA, mCMA, mCIA, mCLC, mSTC, mTC, mINC, mDEC, mIND, mDED,
	mRMB, mSMB, mREB, mSEB, mRPB, mSPB, mJMP, mJCP, mJPA, mCAL, mCZP, mRT, mRTS,
	mCI, mCM, mCMB, mTAB, mCLI, mTMB, mTPA, mTPB,
	mTIT, mIA, mIP, mOE, mOP, mOCD, mNOP,
	mILL,
	mTAW, mTAZ, mTHX, mTLY, mXAW, mXAZ, mXHR, mXHX, mXLS, mXLY, mXC,
	mSFB, mRFB, mFBT, mFBF, mRAR, mINM, mDEM, mSTM, mTTM, mEI, mDI
};

static const char *const s_mnemonics[] =
{
	"LI", "L", "LM", "LDI", "LDZ", "S", "TAL", "TLA",
	"X", "XI", "XD", "XM", "XMI", "XMD", "AD", "ADC", "ADS", "DAA", "DAS",
	"EXL", "CLA", "CMA", "CIA", "CLC", "STC", "TC", "INC", "DEC", "IND", "DED",
	"RMB", "SMB", "REB", "SEB", "RPB", "SPB", "JMP", "JCP", "JPA", "CAL", "CZP", "RT", "RTS",
	"CI", "CM", "CMB", "TAB", "CLI", "TMB", "TPA", "TPB",
	"TIT", "IA", "IP", "OE", "OP", "OCD", "NOP",
	"?",
	"TAW", "TAZ", "THX", "TLY", "XAW", "XAZ", "XHR", "XHX", "XLS", "XLY", "XC",
	"SFB", "RFB", "FBT", "FBF", "RAR", "INM", "DEM", "STM", "TTM", "EI", "DI"
};

// number of bits per opcode parameter, 2 digits means opcode is 2 bytes
static const uint8_t s_bits[] =
{
	4, 0, 2, 80, 4, 0, 0, 0,
	0, 0, 0, 2, 2, 2, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 2, 2, 83, 6, 0, 83, 4, 0, 0,
	40, 0, 2, 2, 40, 2, 2, 2,
	0, 0, 0, 0, 0, 80, 0,
	0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 0, 0, 0, 80, 0, 0, 0
};

#define _OVER DASMFLAG_STEP_OVER
#define _OUT  DASMFLAG_STEP_OUT

static const uint32_t s_flags[] =
{
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, _OVER, _OVER, _OUT, _OUT,
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0,
	0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};


static const uint8_t ucom4_mnemonic[0x100] =
{
	/* 0x00 */
	mNOP, mDI, mS, mTIT, mTC, mTTM, mDAA, mTAL,
	mAD, mADS, mDAS, mCLC, mCM, mINC, mOP, mDEC,
	mCMA, mCIA, mTLA, mDED, mSTM, mLDI, mCLI, mCI,
	mEXL, mADC, mXC, mSTC, mILL, mINM, mOCD, mDEM,
	/* 0x20 */
	mFBF, mFBF, mFBF, mFBF, mTAB, mTAB, mTAB, mTAB,
	mX, mXM, mXM, mXM, mXD, mXMD, mXMD, mXMD,
	mRAR, mEI, mIP, mIND, mCMB, mCMB, mCMB, mCMB,
	mL, mLM, mLM, mLM, mXI, mXMI, mXMI, mXMI,
	/* 0x40 */
	mIA, mJPA, mTAZ, mTAW, mOE, mILL, mTLY, mTHX,
	mRT, mRTS, mXAZ, mXAW, mXLS, mXHR, mXLY, mXHX,
	mTPB, mTPB, mTPB, mTPB, mTPA, mTPA, mTPA, mTPA,
	mTMB, mTMB, mTMB, mTMB, mFBT, mFBT, mFBT, mFBT,
	/* 0x60 */
	mRPB, mRPB, mRPB, mRPB, mREB, mREB, mREB, mREB,
	mRMB, mRMB, mRMB, mRMB, mRFB, mRFB, mRFB, mRFB,
	mSPB, mSPB, mSPB, mSPB, mSEB, mSEB, mSEB, mSEB,
	mSMB, mSMB, mSMB, mSMB, mSFB, mSFB, mSFB, mSFB,
	/* 0x80 */
	mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ,
	mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ, mLDZ,
	mCLA, mLI, mLI, mLI, mLI, mLI, mLI, mLI,
	mLI, mLI, mLI, mLI, mLI, mLI, mLI, mLI,
	/* 0xa0 */
	mJMP, mJMP, mJMP, mJMP, mJMP, mJMP, mJMP, mJMP,
	mCAL, mCAL, mCAL, mCAL, mCAL, mCAL, mCAL, mCAL,
	mCZP, mCZP, mCZP, mCZP, mCZP, mCZP, mCZP, mCZP,
	mCZP, mCZP, mCZP, mCZP, mCZP, mCZP, mCZP, mCZP,
	/* 0xc0 */
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP,
	mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP, mJCP
};



CPU_DISASSEMBLE(ucom4)
{
	int pos = 0;
	uint8_t op = oprom[pos++];
	uint8_t instr = ucom4_mnemonic[op];

	util::stream_format(stream,"%-4s ", s_mnemonics[instr]);

	// opcode parameter
	int bits = s_bits[instr];
	if (bits)
	{
		uint16_t param = op & ((1 << (bits % 10)) - 1);
		if (bits / 10)
		{
			uint8_t op2 = oprom[pos++];
			param = (param << (bits / 10)) | (op2 & ((1 << (bits / 10)) - 1));
			bits = (bits % 10) + (bits / 10);
		}

		// special case for CZP
		if (instr == mCZP)
		{
			param <<= 2;
			bits += 2;
		}

		if (bits <= 4)
			util::stream_format(stream, "%d", param);
		else if (bits <= 8)
			util::stream_format(stream, "$%02X", param);
		else
			util::stream_format(stream, "$%03X", param);
	}

	return pos | s_flags[instr] | DASMFLAG_SUPPORTED;
}