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1 | #include <string.h> |
2 | |
3 | // MAME types |
4 | typedef signed char INT8; |
5 | typedef signed short INT16; |
6 | typedef signed int INT32; |
7 | typedef unsigned int UINT32; |
8 | typedef unsigned short UINT16; |
9 | typedef unsigned char UINT8; |
10 | |
11 | // pico memhandlers |
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12 | unsigned int p32x_sh2_read8(unsigned int a, int id); |
13 | unsigned int p32x_sh2_read16(unsigned int a, int id); |
14 | unsigned int p32x_sh2_read32(unsigned int a, int id); |
15 | void p32x_sh2_write8(unsigned int a, unsigned int d, int id); |
16 | void p32x_sh2_write16(unsigned int a, unsigned int d, int id); |
17 | void p32x_sh2_write32(unsigned int a, unsigned int d, int id); |
18 | |
19 | #define RB(a) p32x_sh2_read8(a,sh2->is_slave) |
20 | #define RW(a) p32x_sh2_read16(a,sh2->is_slave) |
21 | #define RL(a) p32x_sh2_read32(a,sh2->is_slave) |
22 | #define WB(a,d) p32x_sh2_write8(a,d,sh2->is_slave) |
23 | #define WW(a,d) p32x_sh2_write16(a,d,sh2->is_slave) |
24 | #define WL(a,d) p32x_sh2_write32(a,d,sh2->is_slave) |
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25 | |
26 | // some stuff from sh2comn.h |
27 | #define T 0x00000001 |
28 | #define S 0x00000002 |
29 | #define I 0x000000f0 |
30 | #define Q 0x00000100 |
31 | #define M 0x00000200 |
32 | |
33 | #define AM 0xc7ffffff |
34 | |
35 | #define FLAGS (M|Q|I|S|T) |
36 | |
37 | #define Rn ((opcode>>8)&15) |
38 | #define Rm ((opcode>>4)&15) |
39 | |
40 | #include "sh2.c" |
41 | |
42 | void sh2_reset(SH2 *sh2) |
43 | { |
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44 | sh2->pc = RL(0); |
45 | sh2->r[15] = RL(4); |
46 | sh2->sr = I; |
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47 | sh2->vbr = 0; |
48 | sh2->pending_int_irq = 0; |
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49 | } |
50 | |
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51 | static void sh2_do_irq(SH2 *sh2, int level, int vector) |
52 | { |
53 | sh2->irq_callback(sh2->is_slave, level); |
54 | |
55 | sh2->r[15] -= 4; |
56 | WL(sh2->r[15], sh2->sr); /* push SR onto stack */ |
57 | sh2->r[15] -= 4; |
58 | WL(sh2->r[15], sh2->pc); /* push PC onto stack */ |
59 | |
60 | /* set I flags in SR */ |
61 | sh2->sr = (sh2->sr & ~I) | (level << 4); |
62 | |
63 | /* fetch PC */ |
64 | sh2->pc = RL(sh2->vbr + vector * 4); |
65 | |
66 | /* 13 cycles at best */ |
67 | sh2_icount -= 13; |
68 | } |
69 | |
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70 | /* Execute cycles - returns number of cycles actually run */ |
71 | int sh2_execute(SH2 *sh2_, int cycles) |
72 | { |
73 | sh2 = sh2_; |
74 | sh2_icount = cycles; |
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75 | sh2->cycles_aim += cycles; |
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76 | |
77 | do |
78 | { |
79 | UINT32 opcode; |
80 | |
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81 | if (sh2->delay) |
82 | { |
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83 | sh2->ppc = sh2->delay; |
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84 | opcode = RW(sh2->delay); |
85 | sh2->pc -= 2; |
86 | } |
87 | else |
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88 | { |
89 | sh2->ppc = sh2->pc; |
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90 | opcode = RW(sh2->pc); |
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91 | } |
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92 | |
93 | sh2->delay = 0; |
94 | sh2->pc += 2; |
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95 | |
96 | switch (opcode & ( 15 << 12)) |
97 | { |
98 | case 0<<12: op0000(opcode); break; |
99 | case 1<<12: op0001(opcode); break; |
100 | case 2<<12: op0010(opcode); break; |
101 | case 3<<12: op0011(opcode); break; |
102 | case 4<<12: op0100(opcode); break; |
103 | case 5<<12: op0101(opcode); break; |
104 | case 6<<12: op0110(opcode); break; |
105 | case 7<<12: op0111(opcode); break; |
106 | case 8<<12: op1000(opcode); break; |
107 | case 9<<12: op1001(opcode); break; |
108 | case 10<<12: op1010(opcode); break; |
109 | case 11<<12: op1011(opcode); break; |
110 | case 12<<12: op1100(opcode); break; |
111 | case 13<<12: op1101(opcode); break; |
112 | case 14<<12: op1110(opcode); break; |
113 | default: op1111(opcode); break; |
114 | } |
115 | |
116 | if (sh2->test_irq && !sh2->delay) |
117 | { |
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118 | if (sh2->pending_irl > sh2->pending_int_irq) |
119 | sh2_irl_irq(sh2, sh2->pending_irl); |
120 | else |
121 | sh2_internal_irq(sh2, sh2->pending_int_irq, sh2->pending_int_vector); |
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122 | sh2->test_irq = 0; |
123 | } |
124 | sh2_icount--; |
125 | } |
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126 | while (sh2_icount > 0 || sh2->delay); /* can't interrupt before delay */ |
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127 | |
128 | return cycles - sh2_icount; |
129 | } |
130 | |
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131 | void sh2_init(SH2 *sh2, int is_slave) |
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132 | { |
133 | memset(sh2, 0, sizeof(*sh2)); |
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134 | sh2->is_slave = is_slave; |
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135 | } |
136 | |
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137 | void sh2_irl_irq(SH2 *sh2, int level) |
138 | { |
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139 | sh2->pending_irl = level; |
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140 | if (level <= ((sh2->sr >> 4) & 0x0f)) |
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141 | return; |
142 | |
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143 | sh2_do_irq(sh2, level, 64 + level/2); |
144 | } |
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145 | |
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146 | void sh2_internal_irq(SH2 *sh2, int level, int vector) |
147 | { |
148 | sh2->pending_int_irq = level; |
149 | sh2->pending_int_vector = vector; |
150 | if (level <= ((sh2->sr >> 4) & 0x0f)) |
151 | return; |
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152 | |
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153 | sh2_do_irq(sh2, level, vector); |
154 | sh2->pending_int_irq = 0; // auto-clear |
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155 | } |
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156 | |