79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/********************************************************************************/
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/* */
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/* CZ80 exec include source file */
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/* C Z80 emulator version 0.91 */
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/* Copyright 2004-2005 Stephane Dallongeville */
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/* */
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/********************************************************************************/
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int FASTCALL Cz80_Exec(cz80_struc *cpu, int cycles)
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{
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#if CZ80_USE_JUMPTABLE
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#include "cz80jmp.inc"
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#endif
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cz80_struc *CPU;
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uint16_t PC;
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int CCnt;
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uint8_t Opcode;
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CPU = cpu;
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PC = CPU->PC;
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if (CPU->Status & (CZ80_RUNNING | CZ80_DISABLE | CZ80_FAULTED))
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{
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return -(CPU->Status);
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}
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#if CZ80_SIZE_OPT
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CPU->CycleToDo = CPU->CycleSup = cycles;
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CCnt = 0;
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#else
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CPU->CycleToDo = CCnt = cycles;
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CPU->CycleSup = 0;
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#endif
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CPU->Status |= CZ80_RUNNING;
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#if CZ80_SIZE_OPT
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Cz80_Exec_Check:
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if (CCnt <= 0) goto Cz80_Exec_End;
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#else
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goto Cz80_Exec_End;
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#endif
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Cz80_Exec:
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{
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Opcode = FETCH_BYTE;
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Cz80_Exec_IM0:
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{
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union16 *data = pzHL;
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#include "cz80_op.inc"
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}
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}
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Cz80_Exec_End:
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CHECK_INT
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if ((CCnt += CPU->CycleSup) > 0)
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{
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CPU->CycleSup = 0;
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if (!(CPU->Status & CZ80_HALTED)) goto Cz80_Exec;
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// CPU halted
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CCnt = 0;
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}
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Cz80_Exec_Really_End:
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CPU->Status &= ~CZ80_RUNNING;
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CPU->PC = PC;
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// number of executed cycles
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CCnt = CPU->CycleToDo - CCnt;
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// update R register
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zR = (zR + (CCnt >> 2)) & 0x7F;
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return CCnt;
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}
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