forked from KolibriOS/kolibrios
171 lines
6.3 KiB
C++
171 lines
6.3 KiB
C++
/********************************************************************************/
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/* */
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/* CZ80 macro 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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#if CZ80_USE_JUMPTABLE
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#define _SSOP(A,B) A##B
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#define OP(A) _SSOP(OP,A)
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#define OPCB(A) _SSOP(OPCB,A)
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#define OPED(A) _SSOP(OPED,A)
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#define OPXY(A) _SSOP(OPXY,A)
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#define OPXYCB(A) _SSOP(OPXYCB,A)
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#else
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#define OP(A) case A
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#define OPCB(A) case A
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#define OPED(A) case A
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#define OPXY(A) case A
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#define OPXYCB(A) case A
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#endif
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#define GET_BYTE \
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(((uint8_t *)CPU->BasePC)[PC])
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#define GET_BYTE_S \
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(((int8_t *)CPU->BasePC)[PC])
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#define GET_WORD \
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(((uint8_t *)CPU->BasePC)[PC] | \
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(((uint8_t *)CPU->BasePC)[((PC + 1) & 0xffff)] << 8))
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#define FETCH_BYTE \
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(((uint8_t *)CPU->BasePC)[PC++])
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#define FETCH_BYTE_S \
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(((int8_t *)CPU->BasePC)[PC++])
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#define FETCH_WORD(A) \
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A = GET_WORD; \
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PC += 2;
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#if CZ80_SIZE_OPT
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#define RET(A) \
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CCnt -= A; \
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goto Cz80_Exec_Check;
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#else
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#define RET(A) \
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if ((CCnt -= A) <= 0) goto Cz80_Exec_End; \
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goto Cz80_Exec;
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#endif
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#define SET_PC(A) \
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CPU->BasePC = (uintptr_t) CPU->Fetch[(A) >> CZ80_FETCH_SFT]; \
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PC = ((A) & 0xffff);
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#define PRE_IO \
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CPU->CycleIO = CCnt;
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#define POST_IO \
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CCnt = CPU->CycleIO;
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#define READ_BYTE(A, D) \
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D = CPU->Read_Byte(CPU->ctx, (A));
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#if CZ80_USE_WORD_HANDLER
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#define READ_WORD(A, D) \
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D = CPU->Read_Word(CPU->ctx, (A));
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#define READ_WORD_LE(A, D) READ_WORD(A, D)
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#elif CZ80_LITTLE_ENDIAN
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#define READ_WORD(A, D) \
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D = CPU->Read_Byte(CPU->ctx, (A)) | (CPU->Read_Byte(CPU->ctx, ((A) + 1)) << 8);
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#define READ_WORD_LE(A, D) READ_WORD(A, D)
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#else
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#define READ_WORD(A, D) \
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D = (CPU->Read_Byte(CPU->ctx, (A)) << 8) | CPU->Read_Byte(CPU->ctx, ((A) + 1));
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#define READ_WORD_LE(A, D) \
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D = CPU->Read_Byte(CPU->ctx, (A)) | (CPU->Read_Byte(CPU->ctx, ((A) + 1)) << 8);
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#endif
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#define READSX_BYTE(A, D) \
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D = CPU->Read_Byte(CPU->ctx, (A));
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#define WRITE_BYTE(A, D) \
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CPU->Write_Byte(CPU->ctx, (A), (D));
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#if CZ80_USE_WORD_HANDLER
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#define WRITE_WORD(A, D) \
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CPU->Write_Word(CPU->ctx, (A), (D));
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#define WRITE_WORD_LE(A, D) WRITE_WORD(A, D);
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#elif CZ80_LITTLE_ENDIAN
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#define WRITE_WORD(A, D) \
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CPU->Write_Byte(CPU->ctx, (A), (D)); \
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CPU->Write_Byte(CPU->ctx, ((A) + 1), ((D) >> 8));
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#define WRITE_WORD_LE(A, D) WRITE_WORD(A, D);
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#else
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#define WRITE_WORD(A, D) \
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CPU->Write_Byte(CPU->ctx, (A), ((D) >> 8)); \
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CPU->Write_Byte(CPU->ctx, ((A) + 1), (D));
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#define WRITE_WORD_LE(A, D) \
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CPU->Write_Byte(CPU->ctx, (A), (D)); \
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CPU->Write_Byte(CPU->ctx, ((A) + 1), ((D) >> 8));
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#endif
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#define PUSH_16(A) \
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{ \
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uint16_t sp; \
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\
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zSP -= 2; \
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sp = zSP; \
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WRITE_WORD_LE(sp, A); \
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}
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#define POP_16(A) \
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{ \
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uint16_t sp; \
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\
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sp = zSP; \
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READ_WORD_LE(sp, A);\
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zSP = sp + 2; \
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}
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#define IN(A, D) \
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D = CPU->IN_Port(CPU->ctx, (A));
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#define OUT(A, D) \
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CPU->OUT_Port(CPU->ctx, (A), (D));
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#define CHECK_INT \
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if (CPU->Status & (zIFF1 | CZ80_HAS_NMI)) \
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{ \
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uint16_t newPC; \
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\
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if (CPU->Status & CZ80_HAS_NMI) \
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{ \
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/* NMI */ \
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CPU->Status &= ~(CZ80_HALTED | CZ80_HAS_NMI); \
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zIFF1 = 0; \
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newPC = 0x66; \
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} \
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else \
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{ \
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/* MI */ \
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CPU->Status &= ~(CZ80_HALTED | CZ80_HAS_INT); \
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zIFF= 0; \
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\
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if (zIM == 1) newPC = 0x38; \
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else \
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{ \
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uint16_t adr; \
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\
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Opcode = CPU->Interrupt_Ack(CPU->ctx, CPU->IntVect) & 0xFF; \
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if (zIM == 0) goto Cz80_Exec_IM0; \
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\
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adr = Opcode | (zI << 8); \
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READ_WORD(adr, newPC) \
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CCnt -= 8; \
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} \
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} \
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\
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{ \
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uint16_t src = PC; \
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\
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PUSH_16(src) \
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SET_PC(newPC) \
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CCnt -= 11; \
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} \
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}
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