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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 9837 | turbocat | 1 | /********************************************************************************/ |
| 2 | /* */ |
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| 3 | /* CZ80 exec include source file */ |
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| 4 | /* C Z80 emulator version 0.91 */ |
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| 5 | /* Copyright 2004-2005 Stephane Dallongeville */ |
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| 6 | /* */ |
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| 7 | /********************************************************************************/ |
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| 8 | |||
| 9 | int FASTCALL Cz80_Exec(cz80_struc *cpu, int cycles) |
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| 10 | { |
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| 11 | #if CZ80_USE_JUMPTABLE |
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| 12 | #include "cz80jmp.inc" |
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| 13 | #endif |
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| 14 | |||
| 15 | cz80_struc *CPU; |
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| 16 | uint16_t PC; |
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| 17 | int CCnt; |
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| 18 | uint8_t Opcode; |
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| 19 | |||
| 20 | CPU = cpu; |
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| 21 | PC = CPU->PC; |
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| 22 | |||
| 23 | if (CPU->Status & (CZ80_RUNNING | CZ80_DISABLE | CZ80_FAULTED)) |
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| 24 | { |
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| 25 | return -(CPU->Status); |
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| 26 | } |
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| 27 | |||
| 28 | #if CZ80_SIZE_OPT |
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| 29 | CPU->CycleToDo = CPU->CycleSup = cycles; |
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| 30 | CCnt = 0; |
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| 31 | #else |
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| 32 | CPU->CycleToDo = CCnt = cycles; |
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| 33 | CPU->CycleSup = 0; |
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| 34 | #endif |
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| 35 | CPU->Status |= CZ80_RUNNING; |
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| 36 | |||
| 37 | #if CZ80_SIZE_OPT |
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| 38 | Cz80_Exec_Check: |
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| 39 | if (CCnt <= 0) goto Cz80_Exec_End; |
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| 40 | #else |
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| 41 | goto Cz80_Exec_End; |
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| 42 | #endif |
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| 43 | |||
| 44 | Cz80_Exec: |
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| 45 | { |
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| 46 | Opcode = FETCH_BYTE; |
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| 47 | Cz80_Exec_IM0: |
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| 48 | { |
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| 49 | union16 *data = pzHL; |
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| 50 | |||
| 51 | #include "cz80_op.inc" |
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| 52 | } |
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| 53 | } |
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| 54 | |||
| 55 | Cz80_Exec_End: |
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| 56 | CHECK_INT |
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| 57 | if ((CCnt += CPU->CycleSup) > 0) |
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| 58 | { |
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| 59 | CPU->CycleSup = 0; |
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| 60 | if (!(CPU->Status & CZ80_HALTED)) goto Cz80_Exec; |
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| 61 | |||
| 62 | // CPU halted |
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| 63 | CCnt = 0; |
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| 64 | } |
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| 65 | |||
| 66 | Cz80_Exec_Really_End: |
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| 67 | CPU->Status &= ~CZ80_RUNNING; |
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| 68 | CPU->PC = PC; |
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| 69 | |||
| 70 | // number of executed cycles |
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| 71 | CCnt = CPU->CycleToDo - CCnt; |
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| 72 | |||
| 73 | // update R register |
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| 74 | zR = (zR + (CCnt >> 2)) & 0x7F; |
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| 75 | |||
| 76 | return CCnt; |
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| 77 | } |
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| 78 |