summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/ucom4/ucom4d.cpp
blob: 678c1952dfc0ffc93bec0f8d98fdd3ba1aaf34ff (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
153
154
// license:BSD-3-Clause
// copyright-holders:hap
/*

  NEC uCOM-4 MCU family disassembler

*/

#include "emu.h"
#include "ucom4d.h"

const char *const ucom4_disassembler::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
const u8 ucom4_disassembler::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
};

const u32 ucom4_disassembler::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, STEP_OVER, STEP_OVER, STEP_OUT, STEP_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
};


const u8 ucom4_disassembler::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
};


u32 ucom4_disassembler::opcode_alignment() const
{
	return 1;
}

u32 ucom4_disassembler::interface_flags() const
{
	return PAGED2LEVEL;
}

u32 ucom4_disassembler::page_address_bits() const
{
	return 6;
}

u32 ucom4_disassembler::page2_address_bits() const
{
	return 2;
}


offs_t ucom4_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params)
{
	offs_t pos = pc;
	u8 op = opcodes.r8(pos++);
	u8 instr = ucom4_mnemonic[op];

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

	// opcode parameter
	int bits = s_bits[instr];
	if (bits)
	{
		u16 param = op & ((1 << (bits % 10)) - 1);
		if (bits / 10)
		{
			u8 op2 = opcodes.r8(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 - pc) | s_flags[instr] | SUPPORTED;
}