summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/arcompact/arcompactdasm_ops.cpp
blob: b5d5af50ee2d96989d894b6bb0649135a94d68d0 (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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
// license:BSD-3-Clause
// copyright-holders:David Haywood
/*********************************\
 ARCompact disassembler

\*********************************/

#include "emu.h"
#include "arcompactdasm_internal.h"


/************************************************************************************************************************************
*                                                                                                                                   *
* individual opcode handlers (disassembly)                                                                                          *
*                                                                                                                                   *
************************************************************************************************************************************/


int arcompact_disassembler::handle04_f_a_b_c_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int ignore_dst, int b_reserved)
{
	//           PP
	// 0010 0bbb 00ii iiii FBBB CCCC CCAA AAAA
	int size = 4;
	uint32_t limm = 0;
	int got_limm = 0;

	uint8_t breg = common32_get_breg(op);
	bool F = common32_get_F(op);
	uint8_t creg = common32_get_creg(op);
	uint8_t areg = common32_get_areg(op);

	util::stream_format(stream, "%s%s", optext, flagbit[F ? 1:0]);

	if ((!b_reserved) && (breg == DASM_REG_LIMM))
	{
		limm = dasm_get_limm_32bit_opcode(pc, opcodes);
		size = 8;
		got_limm = 1;
	}

	if (creg == DASM_REG_LIMM)
	{
		if (!got_limm)
		{
			limm = dasm_get_limm_32bit_opcode(pc, opcodes);
			size = 8;
		}
	}

	// areg can be LIMM too, but in that case LIMM indicates 'no destination' rather than an actual LIMM value following

	if (ignore_dst == 0)
	{
		if (areg != DASM_REG_LIMM)  util::stream_format(stream, " %s <-", regnames[areg]);
		else util::stream_format(stream, " <no dst> <-");
	}
	else if (ignore_dst == 1) // certain opcode types ignore the 'a' field entirely, it should be set to 0.
	{
			if (areg) util::stream_format(stream, " <reserved %d> <-", areg);
	}
	else if (ignore_dst == 2) // for multiply operations areg should always be set to LIMM
	{
		if (areg != DASM_REG_LIMM) util::stream_format(stream, " <invalid %d> <-", areg);
		else  util::stream_format(stream, " <mulres> <-");
	}

	if (!b_reserved)
	{
		if (breg == DASM_REG_LIMM)
			util::stream_format(stream, " 0x%08x,", limm);
		else
			util::stream_format(stream, " %s,", regnames[breg]);
	}
	else
	{
		if (breg) util::stream_format(stream, "<reserved %d>,", breg);
	}

	if (creg == DASM_REG_LIMM)
		util::stream_format(stream, " 0x%08x", limm);
	else
		util::stream_format(stream, " %s", regnames[creg]);

	return size;
}

// like p00 but with 'u6' istead of C
int arcompact_disassembler::handle04_f_a_b_u6_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int ignore_dst, int b_reserved)
{
	//           PP
	// 0010 0bbb 01ii iiii FBBB uuuu uuAA AAAA
	int size = 4;
	uint32_t limm = 0;
//  int got_limm = 0;

	uint8_t breg = common32_get_breg(op);
	bool F = common32_get_F(op);
	uint32_t u = common32_get_u6(op);
	uint8_t areg = common32_get_areg(op);

	util::stream_format(stream, "%s%s", optext, flagbit[F ? 1:0]);

	if ((!b_reserved) && (breg == DASM_REG_LIMM))
	{
		limm = dasm_get_limm_32bit_opcode(pc, opcodes);
		size = 8;
//      got_limm = 1;
	}

	// areg can be LIMM too, but in that case LIMM indicates 'no destination' rather than an actual LIMM value following

	if (ignore_dst == 0)
	{
		if (areg != DASM_REG_LIMM)  util::stream_format(stream, " %s <-", regnames[areg]);
		else util::stream_format(stream, " <no dst> <-");
	}
	else if (ignore_dst == 1) // certain opcode types ignore the 'a' field entirely, it should be set to 0.
	{
			if (areg) util::stream_format(stream, " <reserved %d> <-", areg);
	}
	else if (ignore_dst == 2) // for multiply operations areg should always be set to LIMM
	{
		if (areg != DASM_REG_LIMM) util::stream_format(stream, " <invalid %d> <-", areg);
		else  util::stream_format(stream, " <mulres> <-");
	}

	if (!b_reserved)
	{
		if (breg == DASM_REG_LIMM)
			util::stream_format(stream, " 0x%08x,", limm);
		else
			util::stream_format(stream, " %s,", regnames[breg]);
	}
	else
	{
		if (breg) util::stream_format(stream, "<reserved %d>,", breg);
	}

	util::stream_format(stream, " 0x%02x", u);

	return size;
}


int arcompact_disassembler::handle04_f_b_b_s12_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int b_reserved)
{
	int size = 4;
	uint32_t limm;
	//int got_limm = 0;

	uint8_t breg = common32_get_breg(op);
	bool F = common32_get_F(op);
	uint32_t S = common32_get_s12(op);

	util::stream_format(stream, "%s%s", optext, flagbit[F ? 1:0]);

	if (!b_reserved)
	{
		if (breg == DASM_REG_LIMM)
		{
			limm = dasm_get_limm_32bit_opcode(pc, opcodes);
			size = 8;
			//got_limm = 1;
			util::stream_format(stream, " 0x%08x ", limm);

		}
		else
		{
			util::stream_format(stream, " %s, ", regnames[breg]);
		}
	}

	util::stream_format(stream, "0x%02x", S);
	return size;
}

int arcompact_disassembler::handle04_cc_f_b_b_c_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int b_reserved)
{
	int size = 4;
	uint32_t limm = 0;
	int got_limm = 0;

	uint8_t breg = common32_get_breg(op);
	bool F = common32_get_F(op);
	uint8_t condition = common32_get_condition(op);
	uint8_t creg = common32_get_creg(op);

	util::stream_format(stream, "%s%s%s", optext, conditions[condition], flagbit[F ? 1:0]);

	if (!b_reserved)
	{
		if (breg == DASM_REG_LIMM)
		{
			limm = dasm_get_limm_32bit_opcode(pc, opcodes);
			size = 8;
			got_limm = 1;
			util::stream_format(stream, " 0x%08x ", limm);

		}
		else
		{
			util::stream_format(stream, " %s, ", regnames[breg]);
		}
	}

	if (creg == DASM_REG_LIMM)
	{
		if (!got_limm)
		{
			limm = dasm_get_limm_32bit_opcode(pc, opcodes);
			size = 8;
		}
		util::stream_format(stream, "0x%08x", limm);
	}
	else
	{
		util::stream_format(stream, "%s", regnames[creg]);
	}

	return size;
}

int arcompact_disassembler::handle04_cc_f_b_b_u6_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int b_reserved)
{
	int size = 4;
	uint32_t limm;
	//int got_limm = 0;

	uint8_t breg = common32_get_breg(op);
	bool F = common32_get_F(op);
	uint8_t condition = common32_get_condition(op);
	uint32_t u = common32_get_u6(op);

	util::stream_format(stream, "%s%s%s", optext, conditions[condition], flagbit[F ? 1:0]);

	if (!b_reserved)
	{
		if (breg == DASM_REG_LIMM)
		{
			limm = dasm_get_limm_32bit_opcode(pc, opcodes);
			size = 8;
			//got_limm = 1;
			util::stream_format(stream, " 0x%08x ", limm);

		}
		else
		{
			util::stream_format(stream, " %s, ", regnames[breg]);
		}
	}

	util::stream_format(stream, "0x%02x", u);

	return size;
}

int arcompact_disassembler::handle04_p11_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int b_reserved)
{
	int M = (op & 0x00000020) >> 5;

	switch (M)
	{
		case 0x00: return handle04_cc_f_b_b_c_helper_dasm(stream, pc, op, opcodes, optext, b_reserved);
		case 0x01: return handle04_cc_f_b_b_u6_helper_dasm(stream, pc, op, opcodes, optext, b_reserved);
	}
	return 0;
}


int arcompact_disassembler::handle04_helper_dasm(std::ostream &stream, offs_t pc, uint32_t op, const data_buffer &opcodes, const char* optext, int ignore_dst, int b_reserved)
{
	uint8_t p = common32_get_p(op);

	switch (p)
	{
		case 0x00: return handle04_f_a_b_c_helper_dasm(stream, pc, op, opcodes, optext, ignore_dst, b_reserved);
		case 0x01: return handle04_f_a_b_u6_helper_dasm(stream, pc, op, opcodes, optext, ignore_dst, b_reserved);
		case 0x02: return handle04_f_b_b_s12_helper_dasm(stream, pc, op, opcodes, optext, b_reserved);
		case 0x03: return handle04_p11_helper_dasm(stream, pc, op, opcodes, optext, b_reserved);
	}

	return 0;
}


int arcompact_disassembler::handle::dasm_illegal(std::ostream& stream, offs_t pc, uint8_t param1, uint8_t param2, uint32_t op, const data_buffer& opcodes)
{
	util::stream_format(stream, "<illegal 0x%02x_%02x> (%08x)\n", param1, param2, op);
	return 4;
}

int arcompact_disassembler::handle::dasm_illegal(std::ostream& stream, offs_t pc, uint8_t param1, uint8_t param2, uint8_t param3, uint32_t op, const data_buffer& opcodes)
{
	util::stream_format(stream, "<illegal 0x%02x_%02x_%02x> (%08x)\n", param1, param2, param3, op);
	return 4;
}

int arcompact_disassembler::handle::dasm_illegal(std::ostream& stream, offs_t pc, uint8_t param1, uint8_t param2, uint8_t param3, uint8_t param4, uint32_t op, const data_buffer& opcodes)
{
	util::stream_format(stream, "<illegal 0x%02x_%02x_%02x_%02x> (%08x)\n", param1, param2, param3, param4, op);
	return 4;
}

int arcompact_disassembler::handle::dasm_reserved(std::ostream& stream, offs_t pc, uint8_t param1, uint8_t param2, uint8_t param3, uint8_t param4, uint32_t op, const data_buffer& opcodes)
{
	util::stream_format(stream, "<reserved 0x%02x_%02x_%02x_%02x> (%08x)\n", param1, param2, param3, param4, op);
	return 4;
}