summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/cpu/arcompact/arcompact.c
blob: 5527830be1b5586ded24041633f74c246e24cd10 (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
/*********************************\

 ARCompact Core

 The following procesors use the ARCompact instruction set

  - ARCtangent-A5
  - ARC 600
  - ARC 700

 (this is a skeleton core)

 ARCompact is a 32-bit CPU that freely mixes 32-bit and 16-bit instructions
 various user customizations could be made as with the ARC A4 based processors
 these include custom instructions and registers.

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

#include "emu.h"
#include "debugger.h"
#include "arcompact.h"
#include "arcompact_common.h"


const device_type ARCA5 = &device_creator<arcompact_device>;

static ADDRESS_MAP_START( arcompact_auxreg_map, AS_IO, 32, arcompact_device )
ADDRESS_MAP_END


arcompact_device::arcompact_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
	: cpu_device(mconfig, ARCA5, "ARCtangent-A5", tag, owner, clock, "arca5", __FILE__)
	, m_program_config("program", ENDIANNESS_LITTLE, 32, 32, 0) // some docs describe these as 'middle endian'?!
	, m_io_config( "io", ENDIANNESS_LITTLE, 32, 34, 0, ADDRESS_MAP_NAME( arcompact_auxreg_map ) ) // IO space is 32 bits of dwords, so 34-bits
{
}


offs_t arcompact_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
{
	extern CPU_DISASSEMBLE( arcompact );
	return CPU_DISASSEMBLE_NAME(arcompact)(this, buffer, pc, oprom, opram, options);
}


/*****************************************************************************/

/*****************************************************************************/

void arcompact_device::unimplemented_opcode(UINT16 op)
{
	fatalerror("ARCOMPACT: unknown opcode %04x at %04x\n", op, m_pc << 2);
}

/*****************************************************************************/


/*****************************************************************************/

void arcompact_device::device_start()
{
	m_pc = 0;

	m_debugger_temp = 0;

	m_program = &space(AS_PROGRAM);
	m_io = &space(AS_IO);

	state_add( 0,  "PC", m_debugger_temp).callimport().callexport().formatstr("%08X");

	state_add( 0x10,  "STATUS32", m_debugger_temp).callimport().callexport().formatstr("%08X");
	state_add( 0x11,  "LP_START", m_debugger_temp).callimport().callexport().formatstr("%08X");
	state_add( 0x12,  "LP_END", m_debugger_temp).callimport().callexport().formatstr("%08X");

	state_add(STATE_GENPC, "GENPC", m_debugger_temp).callexport().noshow();

	for (int i = 0x100; i < 0x140; i++)
	{
		state_add(i, regnames[i-0x100], m_debugger_temp).callimport().callexport().formatstr("%08X");
	}


	m_icountptr = &m_icount;
}

void arcompact_device::state_export(const device_state_entry &entry)
{
	int index = entry.index();

	switch (index)
	{
		case 0:
			m_debugger_temp = m_pc;
			break;

		case 0x10:
			m_debugger_temp = m_status32;
			break;
		case 0x11:
			m_debugger_temp = m_LP_START;
			break;
		case 0x12:
			m_debugger_temp = m_LP_END;
			break;

		case STATE_GENPC:
			m_debugger_temp = m_pc;
			break;

		default:
			if ((index >= 0x100) && (index < 0x140))
			{
				m_debugger_temp = m_regs[index - 0x100];
			}
			break;

	}
}

void arcompact_device::state_import(const device_state_entry &entry)
{
	int index = entry.index();

	switch (index)
	{
		case 0:
			m_pc = (m_debugger_temp & 0xfffffffe);
			break;

		case 0x10:
			m_status32 = m_debugger_temp;
			break;
		case 0x11:
			m_LP_START = m_debugger_temp;
			break;
		case 0x12:
			m_LP_END = m_debugger_temp;
			break;

		default:
			if ((index >= 0x100) && (index < 0x140))
			{
				m_regs[index - 0x100] = m_debugger_temp;
			}
			break;
	}
}

void arcompact_device::device_reset()
{
	m_pc = 0x00000000;

	m_delayactive = 0;
	m_delayjump = 0x00000000;

	for (int i = 0; i < 0x40; i++)
		m_regs[i] = 0;

	m_status32 = 0;
	m_LP_START = 0;
	m_LP_END = 0;

}


/*****************************************************************************/


void arcompact_device::execute_set_input(int irqline, int state)
{
}