505 lines
10 KiB
C
505 lines
10 KiB
C
/********************************************************************************/
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/* */
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/* CZ80 (Z80 CPU emulator) version 0.91 */
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/* Compiled with Dev-C++ */
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/* Copyright 2004-2005 Stephane Dallongeville */
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/* */
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/********************************************************************************/
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//#ifdef CPUZ80_CZ80_CORE
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#include <stdio.h>
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#include <string.h>
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#include <stddef.h>
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#include "cz80.h"
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// include macro file
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//////////////////////
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#include "cz80.inc"
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// shared global variable
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//////////////////////////
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cz80_struc CZ80;
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static uint8_t SZXY[256]; // zero and sign flags
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static uint8_t SZXYP[256]; // zero, sign and parity flags
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static uint8_t SZXY_BIT[256]; // zero, sign and parity/overflow (=zero) flags for BIT opcode
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static uint8_t SZXYHV_inc[256]; // zero, sign, half carry and overflow flags INC R8
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static uint8_t SZXYHV_dec[256]; // zero, sign, half carry and overflow flags DEC R8
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// prototype
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/////////////
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uint8_t FASTCALL Cz80_Read_Dummy(void *ctx, const uint16_t adr);
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void FASTCALL Cz80_Write_Dummy(void *ctx, const uint16_t adr, uint8_t data);
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uint8_t FASTCALL Cz80_Interrupt_Ack_Dummy(void *ctx, uint8_t param);
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void FASTCALL Cz80_RetI_Dummy(void *ctx);
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// core main functions
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///////////////////////
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void Cz80_Init(cz80_struc *cpu)
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{
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unsigned int i, j, p;
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memset(cpu, 0, sizeof(cz80_struc));
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// flags tables initialisation
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for (i = 0; i < 256; i++)
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{
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SZXY[i] = i & (CZ80_SF | CZ80_YF | CZ80_XF);
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if (!i) SZXY[i] |= CZ80_ZF;
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SZXY_BIT[i] = i & (CZ80_SF | CZ80_YF | CZ80_XF);
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if (!i) SZXY_BIT[i] |= CZ80_ZF | CZ80_PF;
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for (j = 0, p = 0; j < 8; j++) if (i & (1 << j)) p++;
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SZXYP[i] = SZXY[i];
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if (!(p & 1)) SZXYP[i] |= CZ80_PF;
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SZXYHV_inc[i] = SZXY[i];
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if(i == 0x80) SZXYHV_inc[i] |= CZ80_VF;
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if((i & 0x0F) == 0x00) SZXYHV_inc[i] |= CZ80_HF;
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SZXYHV_dec[i] = SZXY[i] | CZ80_NF;
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if (i == 0x7F) SZXYHV_dec[i] |= CZ80_VF;
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if ((i & 0x0F) == 0x0F) SZXYHV_dec[i] |= CZ80_HF;
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}
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Cz80_Set_Fetch(cpu, 0x0000, 0xFFFF, NULL);
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Cz80_Set_ReadB(cpu, Cz80_Read_Dummy);
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Cz80_Set_WriteB(cpu, Cz80_Write_Dummy);
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cpu->Interrupt_Ack = Cz80_Interrupt_Ack_Dummy;
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cpu->RetI = Cz80_RetI_Dummy;
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}
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uint8_t Cz80_Reset(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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memset(CPU, 0, offsetof(cz80_struc, CycleSup));
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Cz80_Set_PC(CPU, 0);
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zIX = 0xFFFF;
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zIY = 0xFFFF;
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#if CZ80_DEBUG
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zF = CZ80_ZF;
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#else
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zSP = 0xFFFF;
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zFA = 0xFFFF;
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#endif
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return CPU->Status;
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}
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/////////////////////////////////
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#include "cz80exec.inc"
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/////////////////////////////////
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void FASTCALL Cz80_Set_IRQ(cz80_struc *cpu, uint8_t vector)
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{
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cpu->IntVect = vector;
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cpu->Status |= CZ80_HAS_INT;
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cpu->CycleSup = cpu->CycleIO;
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cpu->CycleIO = 0;
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}
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void FASTCALL Cz80_Set_NMI(cz80_struc *cpu)
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{
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cpu->Status |= CZ80_HAS_NMI;
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cpu->CycleSup = cpu->CycleIO;
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cpu->CycleIO = 0;
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}
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void FASTCALL Cz80_Clear_IRQ(cz80_struc *cpu)
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{
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cpu->Status &= ~CZ80_HAS_INT;
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}
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void FASTCALL Cz80_Clear_NMI(cz80_struc *cpu)
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{
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cpu->Status &= ~CZ80_HAS_NMI;
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}
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/////////////////////////////////
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int FASTCALL Cz80_Get_CycleToDo(cz80_struc *cpu)
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{
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if (!(cpu->Status & CZ80_RUNNING)) return -1;
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return cpu->CycleToDo;
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}
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int FASTCALL Cz80_Get_CycleRemaining(cz80_struc *cpu)
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{
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if (!(cpu->Status & CZ80_RUNNING)) return -1;
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return (cpu->CycleIO + cpu->CycleSup);
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}
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int FASTCALL Cz80_Get_CycleDone(cz80_struc *cpu)
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{
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if (!(cpu->Status & CZ80_RUNNING)) return -1;
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return (cpu->CycleToDo - (cpu->CycleIO + cpu->CycleSup));
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}
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void FASTCALL Cz80_Release_Cycle(cz80_struc *cpu)
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{
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if (cpu->Status & CZ80_RUNNING) cpu->CycleIO = cpu->CycleSup = 0;
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}
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void FASTCALL Cz80_Add_Cycle(cz80_struc *cpu, unsigned int cycle)
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{
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if (cpu->Status & CZ80_RUNNING) cpu->CycleIO -= cycle;
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}
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// Read / Write dummy functions
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////////////////////////////////
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uint8_t FASTCALL Cz80_Read_Dummy(void *ctx, const uint16_t adr)
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{
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(void)ctx;
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(void)adr;
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return 0;
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}
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void FASTCALL Cz80_Write_Dummy(void *ctx, const uint16_t adr, uint8_t data)
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{
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(void)ctx;
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(void)adr;
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(void)data;
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}
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uint8_t FASTCALL Cz80_Interrupt_Ack_Dummy(void *ctx, uint8_t param)
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{
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(void)ctx;
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(void)param;
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// return vector
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return -1;
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}
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void FASTCALL Cz80_RetI_Dummy(void *ctx)
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{
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(void)ctx;
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}
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// Read / Write core functions
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///////////////////////////////
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void Cz80_Set_Ctx(cz80_struc *cpu, void *ctx)
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{
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cpu->ctx = ctx;
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}
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uint8_t Cz80_Read_Byte(cz80_struc *cpu, uint16_t adr)
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{
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return cpu->Read_Byte(cpu->ctx, adr);
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}
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uint16_t Cz80_Read_Word(cz80_struc *cpu, uint16_t adr)
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{
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#if CZ80_USE_WORD_HANDLER
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return cpu->Read_Word(cpu->ctx, adr);
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#elif CZ80_LITTLE_ENDIAN
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return (cpu->Read_Byte(cpu->ctx, adr) |
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(cpu->Read_Byte(cpu->ctx, (adr + 1)) << 8));
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#else
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return ((cpu->Read_Byte(cpu->ctx, adr) << 8) |
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cpu->Read_Byte(cpu->ctx, (adr + 1)));
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#endif
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}
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void Cz80_Write_Byte(cz80_struc *cpu, uint16_t adr, uint8_t data)
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{
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cpu->Write_Byte(cpu->ctx, adr, data);
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}
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void Cz80_Write_Word(cz80_struc *cpu, uint16_t adr, uint16_t data)
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{
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#if CZ80_USE_WORD_HANDLER
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cpu->Write_Word(cpu->ctx, adr, data);
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#elif CZ80_LITTLE_ENDIAN
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cpu->Write_Byte(cpu->ctx, adr, (data & 0xFF));
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cpu->Write_Byte(cpu->ctx, (adr + 1), (data >> 8));
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#else
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cpu->Write_Byte(cpu->ctx, adr, (data >> 8));
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cpu->Write_Byte(cpu->ctx, (adr + 1), (data & 0xFF));
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#endif
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}
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// setting core functions
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//////////////////////////
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void Cz80_Set_Fetch(cz80_struc *cpu, uint16_t low_adr, uint16_t high_adr, void *fetch_adr)
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{
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uint16_t i, j;
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i = low_adr >> CZ80_FETCH_SFT;
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j = high_adr >> CZ80_FETCH_SFT;
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fetch_adr = (void *)((uintptr_t)fetch_adr - (i << CZ80_FETCH_SFT));
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while (i <= j) cpu->Fetch[i++] = (uint8_t*) fetch_adr;
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}
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void Cz80_Set_ReadB(cz80_struc *cpu, CZ80_READ *Func)
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{
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cpu->Read_Byte = Func;
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}
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void Cz80_Set_WriteB(cz80_struc *cpu, CZ80_WRITE *Func)
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{
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cpu->Write_Byte = Func;
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}
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#if CZ80_USE_WORD_HANDLER
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void Cz80_Set_ReadW(cz80_struc *cpu, CZ80_READ_WORD *Func)
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{
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cpu->Read_Word = Func;
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}
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void Cz80_Set_WriteW(cz80_struc *cpu, CZ80_WRITE_WORD *Func)
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{
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cpu->Write_Word = Func;
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}
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#endif
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void Cz80_Set_INPort(cz80_struc *cpu, CZ80_READ *Func)
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{
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cpu->IN_Port = Func;
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}
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void Cz80_Set_OUTPort(cz80_struc *cpu, CZ80_WRITE *Func)
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{
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cpu->OUT_Port = Func;
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}
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void Cz80_Set_IRQ_Callback(cz80_struc *cpu, CZ80_INT_CALLBACK *Func)
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{
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cpu->Interrupt_Ack = Func;
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}
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void Cz80_Set_RETI_Callback(cz80_struc *cpu, CZ80_RETI_CALLBACK *Func)
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{
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cpu->RetI = Func;
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}
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// externals main functions
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////////////////////////////
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uint16_t FASTCALL Cz80_Get_BC(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zBC;
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}
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uint16_t FASTCALL Cz80_Get_DE(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zDE;
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}
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uint16_t FASTCALL Cz80_Get_HL(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zHL;
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}
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uint16_t FASTCALL Cz80_Get_AF(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return (zF | (zA << 8));
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}
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uint16_t FASTCALL Cz80_Get_BC2(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zBC2;
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}
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uint16_t FASTCALL Cz80_Get_DE2(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zDE2;
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}
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uint16_t FASTCALL Cz80_Get_HL2(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zHL2;
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}
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uint16_t FASTCALL Cz80_Get_AF2(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return (zF2 | (zA2 << 8));
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}
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uint16_t FASTCALL Cz80_Get_IX(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zIX;
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}
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uint16_t FASTCALL Cz80_Get_IY(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zIY;
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}
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uint16_t FASTCALL Cz80_Get_SP(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zSP;
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}
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uint16_t FASTCALL Cz80_Get_PC(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return CPU->PC;
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}
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uint16_t FASTCALL Cz80_Get_R(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zR;
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}
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uint16_t FASTCALL Cz80_Get_IFF(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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uint16_t value = 0;
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if (zIFF1 & CZ80_IFF) value |= 1;
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if (zIFF2 & CZ80_IFF) value |= 2;
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return value;
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}
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uint8_t FASTCALL Cz80_Get_IM(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zIM;
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}
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uint8_t FASTCALL Cz80_Get_I(cz80_struc *cpu)
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{
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cz80_struc *CPU = cpu;
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return zI;
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}
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void FASTCALL Cz80_Set_BC(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zBC = value;
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}
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void FASTCALL Cz80_Set_DE(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zDE = value;
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}
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void FASTCALL Cz80_Set_HL(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zHL = value;
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}
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void FASTCALL Cz80_Set_AF(cz80_struc *cpu, uint16_t val)
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{
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cz80_struc *CPU = cpu;
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zF = val;
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zA = val >> 8;
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}
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void FASTCALL Cz80_Set_BC2(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zBC2 = value;
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}
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void FASTCALL Cz80_Set_DE2(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zDE2 = value;
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}
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void FASTCALL Cz80_Set_HL2(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zHL2 = value;
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}
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void FASTCALL Cz80_Set_AF2(cz80_struc *cpu, uint16_t val)
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{
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cz80_struc *CPU = cpu;
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zF2 = val;
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zA2 = val >> 8;
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}
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void FASTCALL Cz80_Set_IX(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zIX = value;
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}
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void FASTCALL Cz80_Set_IY(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zIY = value;
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}
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void FASTCALL Cz80_Set_SP(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zSP = value;
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}
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void FASTCALL Cz80_Set_PC(cz80_struc *cpu, uint16_t val)
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{
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cpu->BasePC = (uintptr_t) cpu->Fetch[val >> CZ80_FETCH_SFT];
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cpu->PC = val;
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}
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void FASTCALL Cz80_Set_R(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zR = value & 0xFF;
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zR2 = value & 0x80;
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}
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void FASTCALL Cz80_Set_IFF(cz80_struc *cpu, uint16_t value)
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{
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cz80_struc *CPU = cpu;
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zIFF = 0;
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if (value & 1) zIFF1 = CZ80_IFF;
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if (value & 2) zIFF2 = CZ80_IFF;
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}
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void FASTCALL Cz80_Set_IM(cz80_struc *cpu, uint8_t value)
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{
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cz80_struc *CPU = cpu;
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zIM = value & 3;
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}
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void FASTCALL Cz80_Set_I(cz80_struc *cpu, uint8_t value)
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{
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cz80_struc *CPU = cpu;
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zI = value & 0xFF;
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}
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//#endif // CPUZ80_CZ80_CORE
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