📄 cpuops.s

📁 SFC游戏模拟器 snes9x 1.43 的原代码
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/* TSB */Op04M1:	Direct8 TSB MODIFY	Tsb8 DIROp04M0:	Direct8 TSB2 MODIFY	Tsb16 DIROp0CM1:	Absolute8 TSB MODIFY	Tsb8 ABSOp0CM0:	Absolute8 TSB2 MODIFY	Tsb16 ABS/* BCC */Op90:	Relative JUMP	BranchCheck0 BCC	testb $0xff, _Carry	jnz .BCC_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC.BCC_EXIT:	jmp MainAsmLoop/* BCS */OpB0:	Relative JUMP	BranchCheck0 BCS	testb $0xff, _Carry	jz .BCS_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC.BCS_EXIT:	jmp MainAsmLoop/* BEQ */OpF0:	Relative JUMP	BranchCheck2 BEQ	testb $0xff, _Zero	jnz .BEQ_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BEQ.BEQ_EXIT:	jmp MainAsmLoop/* BMI */Op30:	Relative JUMP	BranchCheck1 BMI	testb $0x80, _Negative	jz .BMI_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BMI.BMI_EXIT:	jmp MainAsmLoop/* BNE */OpD0:	Relative JUMP	BranchCheck1 BNE	testb $0xff, _Zero	jz .BNE_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BNE.BNE_EXIT:	jmp MainAsmLoop/* BPL */Op10:	Relative JUMP	BranchCheck1 BPL	testb $0x80, _Negative	jnz .BPL_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BPL.BPL_EXIT:	jmp MainAsmLoop/* BRA */Op80:	Relative JUMP	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	jmp MainAsmLoop/* BVC */Op50:	Relative JUMP	BranchCheck0 BVC	testb $0xff, _Overflow	jnz .BVC_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BVC.BVC_EXIT:	jmp MainAsmLoop/* BVS */Op70:	Relative JUMP	BranchCheck0 BVS	testb $0xff, _Overflow	jz .BVS_EXIT	addl $6, CYCLES	andl $0xffff, %edx	addl PCBase, %edx	movl %edx, PC	CPUShutdown BVS.BVS_EXIT:	jmp MainAsmLoop/* BRL */Op82:	RelativeLong BRL JUMP	andl $0xffff, %edx	orl ShiftedPB, %edx	call S9xSetPCBase	jmp MainAsmLoop/* CLC */Op18:	movb $0, _Carry	addl $6, CYCLES	jmp MainAsmLoop/* CLD */OpD8:	andb $~Decimal, FLAGS	addl $6, CYCLES	jmp MainAsmLoop/* CLI */Op58:	andb $~IRQ, FLAGS	addl $6, CYCLES#if 0 /* C version has this commented out? */	cmpb $0, IRQActive	jz .CLI_EXIT	/* XXX: test for Settings.DisableIRQ */	call S9xOpcode_IRQ#endif.CLI_EXIT:	jmp MainAsmLoop/* CLV */OpB8:	movb $0, _Overflow	addl $6, CYCLES	jmp MainAsmLoop/* DEX */OpCAX1:	addl $6, CYCLES	movb XL, %al	decb %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, XL	SetZN	jmp MainAsmLoopOpCAX0:	addl $6, CYCLES	decw XX	setnz _Zero	movb XH, %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, _Negative	jmp MainAsmLoop/* DEY */Op88X1:	addl $6, CYCLES	movb YL, %al	decb %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, YL	SetZN	jmp MainAsmLoopOp88X0:	addl $6, CYCLES	decw YY	setnz _Zero	movb YH, %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, _Negative	jmp MainAsmLoop/* INX */OpE8X1:	addl $6, CYCLES	movb XL, %al	incb %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, XL	SetZN	jmp MainAsmLoopOpE8X0:	addl $6, CYCLES	incw XX	setnz _Zero	movb XH, %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, _Negative	jmp MainAsmLoop/* INY */OpC8X1:	addl $6, CYCLES	movb YL, %al	incb %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, YL	SetZN	jmp MainAsmLoopOpC8X0:	addl $6, CYCLES	incw YY	setnz _Zero	movb YH, %al#ifdef CPU_SHUTDOWN	movl $0, WaitAddress#endif	movb %al, _Negative	jmp MainAsmLoop/* NOP */OpEA:	addl $6,CYCLES	jmp MainAsmLoop/* PEA */OpF4E1:	Immediate16 PEA NONE	PushWordENew PEA	jmp MainAsmLoopOpF4:	Immediate16 PEA NONE	PushWord PEA	jmp MainAsmLoop/* PEI */OpD4E1:	DirectIndirect8 PEI NONE	movl %edx, %eax	PushWordENew PEI	jmp MainAsmLoopOpD4:	DirectIndirect8 PEI NONE	movl %edx, %eax	PushWord PEI	jmp MainAsmLoop/* PER */Op62E1:	RelativeLong PER NONE	movl %edx, %eax	PushWordENew PER	jmp MainAsmLoop	Op62:	RelativeLong PER NONE	movl %edx, %eax	PushWord PER	jmp MainAsmLoop	/* PHA */Op48E1:	addl $6, CYCLES	movb AL, %al	PushByteE PHA	jmp MainAsmLoopOp48M1:	addl $6, CYCLES	movb AL, %al	PushByte PHA	jmp MainAsmLoopOp48M0:	addl $6, CYCLES	movw AA, %ax	PushWord PHA	jmp MainAsmLoop/* PHB */Op8BE1:	addl $6, CYCLES	movb DB, %al	PushByteE PHB	jmp MainAsmLoopOp8B:	addl $6, CYCLES	movb DB, %al	PushByte PHB	jmp MainAsmLoop/* PHD */Op0BE1:	addl $6, CYCLES	movw DD, %ax	PushWordENew PHD	jmp MainAsmLoopOp0B:	addl $6, CYCLES	movw DD, %ax	PushWord PHD	jmp MainAsmLoop/* PHK */Op4BE1:	addl $6, CYCLES	movb PB, %al	PushByteE PHK	jmp MainAsmLoopOp4B:	addl $6, CYCLES	movb PB, %al	PushByte PHK	jmp MainAsmLoop/* PHP */Op08E1:	addl $6, CYCLES	S9xPackStatus PHP	movb FLAGS, %al	PushByteE PHP	jmp MainAsmLoopOp08:	addl $6, CYCLES	S9xPackStatus PHP	movb FLAGS, %al	PushByte PHP	jmp MainAsmLoop/* PHX */OpDAE1:	addl $6, CYCLES	movb XL, %al	PushByteE PHX	jmp MainAsmLoopOpDAX1:	addl $6, CYCLES	movb XL, %al	PushByte PHX	jmp MainAsmLoopOpDAX0:	addl $6, CYCLES	movw XX, %ax	PushWord PHX	jmp MainAsmLoop/* PHY */Op5AE1:	addl $6, CYCLES	movb YL, %al	PushByteE PHY	jmp MainAsmLoopOp5AX1:	addl $6, CYCLES	movb YL, %al	PushByte PHY	jmp MainAsmLoopOp5AX0:	addl $6, CYCLES	movw YY, %ax	PushWord PHY	jmp MainAsmLoop/* PLA */Op68E1:	addl $12, CYCLES	PullByteE PLA	movb %al, AL	SetZN	jmp MainAsmLoopOp68M1:	addl $12, CYCLES	PullByte PLA	movb %al, AL	SetZN	jmp MainAsmLoopOp68M0:	addl $12, CYCLES	PullWord PLA	movw %ax, AA	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* PLB */OpABE1:	addl $12, CYCLES	PullByteE PLB	movb %al, DB	SetZN	andl $0xff, %eax	sall $16, %eax	movl %eax, ShiftedDB	jmp MainAsmLoopOpAB:	addl $12, CYCLES	PullByte PLB	movb %al, DB	SetZN	andl $0xff, %eax	sall $16, %eax	movl %eax, ShiftedDB	jmp MainAsmLoop/* PLD */Op2BE1:	addl $12, CYCLES	PullWordENew PLD	movw %ax, DD	testw %ax, %ax	Set16ZN	jmp MainAsmLoopOp2B:	addl $12, CYCLES	PullWord PLD	movw %ax, DD	testw %ax, %ax	Set16ZN	jmp MainAsmLoop	/* PLP */Op28E1:	addl $12, CYCLES	PullByteE PLPE	movb %al, FLAGS	testb $IndexFlag, FLAGS	jz .PLP16E	xorb %al, %al	movb %al, XH	movb %al, YH.PLP16E:	S9xUnpackStatus PLPE	S9xFixCycles PLPE/*	CheckForIrq PLP */	jmp MainAsmLoopOp28:	addl $12, CYCLES	PullByte PLP	movb %al, FLAGS	testb $IndexFlag, FLAGS	jz .PLP16	xorb %al, %al	movb %al, XH	movb %al, YH.PLP16:	S9xUnpackStatus PLP	S9xFixCycles PLP/*	CheckForIrq PLP */	jmp MainAsmLoop/* PLX */OpFAE1:	addl $12, CYCLES	PullByteE PLX	movb %al, XL	SetZN	jmp MainAsmLoopOpFAX1:	addl $12, CYCLES	PullByte PLX	movb %al, XL	SetZN	jmp MainAsmLoopOpFAX0:	addl $12, CYCLES	PullWord PLX	movw %ax, XX	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* PLY */Op7AE1:	addl $12, CYCLES	PullByteE PLY	movb %al, YL	SetZN	jmp MainAsmLoopOp7AX1:	addl $12, CYCLES	PullByte PLY	movb %al, YL	SetZN	jmp MainAsmLoopOp7AX0:	addl $12, CYCLES	PullWord PLY	movw %ax, YY	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* SEC */Op38:	movb $1, _Carry	addl $6, CYCLES	jmp MainAsmLoop/* SED */OpF8:		orb $Decimal, FLAGS	addl $6, CYCLES	jmp MainAsmLoop/* SEI */Op78:	orb $IRQ, FLAGS	addl $6, CYCLES	jmp MainAsmLoop/* TAX */OpAAX1:	addl $6, CYCLES	movb AL, %al	movb %al, XL	SetZN	jmp MainAsmLoopOpAAX0:	addl $6, CYCLES	movw AA, %ax	movw %ax, XX	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TAY */OpA8X1:	addl $6, CYCLES	movb AL, %al	movb %al, YL	SetZN	jmp MainAsmLoopOpA8X0:	addl $6, CYCLES	movw AA, %ax	movw %ax, YY	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TCD */Op5B:	addl $6, CYCLES	movw AA, %ax	movw %ax, DD	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TCS */Op1B:	addl $6, CYCLES	movw AA, %ax	movw %ax, SS	testw $Emulation, FLAGS16	jz .TCS_EXIT	movb $1, SH.TCS_EXIT:	jmp MainAsmLoop/* TDC */Op7B:	addl $6, CYCLES	movw DD, %ax	movw %ax, AA	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TSC */Op3B:	addl $6, CYCLES	movw SS, %ax	movw %ax, AA	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TSX */OpBAX1:	addl $6, CYCLES	movb SL, %al	movb %al, XL	SetZN	jmp MainAsmLoopOpBAX0:	addl $6, CYCLES	movw SS, %ax	movw %ax, XX	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TXA */Op8AM1:	addl $6, CYCLES	movb XL, %al	movb %al, AL	SetZN	jmp MainAsmLoopOp8AM0:	addl $6, CYCLES	movw XX, %ax	movw %ax, AA	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TXS */Op9A:	addl $6, CYCLES	movw XX, %ax	movw %ax, SS	testw $Emulation, FLAGS16	jz .TXS_EXIT	movb $1, SH.TXS_EXIT:	jmp MainAsmLoop/* TXY */Op9BX1:	addl $6, CYCLES	movb XL, %al	movb %al, YL	SetZN	jmp MainAsmLoopOp9BX0:	addl $6, CYCLES	movw XX, %ax	movw %ax, YY	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TYA */Op98M1:	addl $6, CYCLES	movb YL, %al	movb %al, AL	SetZN	jmp MainAsmLoopOp98M0:	addl $6, CYCLES	movw YY, %ax	movw %ax, AA	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* TYX */OpBBX1:	addl $6, CYCLES	movb YL, %al	movb %al, XL	SetZN	jmp MainAsmLoopOpBBX0:	addl $6, CYCLES	movw YY, %ax	movw %ax, XX	testw %ax, %ax	Set16ZN	jmp MainAsmLoop/* XCE */OpFB:	addl $6, CYCLES	movw FLAGS16, %ax	andw $~(Emulation | Carry), FLAGS16	GetCarry	jnc .XCE_NO_CARRY	orw $Emulation, FLAGS16.XCE_NO_CARRY:	testw $Emulation, %ax	setnz _Carry	testw $Emulation, FLAGS16	jz .XCE_NO_EMULATION2	orw $(MemoryFlag | IndexFlag), FLAGS16	movb $1, SH.XCE_NO_EMULATION2:	testw $IndexFlag, FLAGS16	jz .XCE_NO_INDEX	xorl %eax, %eax	movb %al, XH	movb %al, YH.XCE_NO_INDEX:	S9xFixCycles XCE	jmp MainAsmLoop		.data.LC0:	.string	"*** BRK".textOp00:#ifdef DEBUGGER	testb $TRACE_FLAG, Flags	je .BRK_NO_TRACE	pushl $.LC0	ccall S9xTraceMessage	addl $4,%esp.BRK_NO_TRACE:#endif	movb $1, BRKTriggered	testw $Emulation, FLAGS16	jnz .BRK_EMULATION	movb PB, %al	PushByte BRK1	movl PC, %eax	subl PCBase, %eax	incl %eax	PushWord BRK2		S9xPackStatus BRK	movb FLAGS, %al	movb %al, OpenBus	andb $~Decimal, FLAGS	orb $IRQ, FLAGS		PushByte BRK3	xorl %ecx, %ecx	movl %ecx, ShiftedPB	movb %cl, PB	addl $12, CYCLES	movl $0xFFE6, %edx	call S9xGetWord	movl %eax, %edx	andl $0xffff, %edx	call S9xSetPCBase	jmp MainAsmLoop.BRK_EMULATION:	movl PC, %eax	subl PCBase, %eax	incl %eax	PushWord BRK2		S9xPackStatus BRK2	movb FLAGS, %al	movb %al, OpenBus	andb $~Decimal, FLAGS	orb $IRQ, FLAGS		PushByte BRK3	xorl %ecx, %ecx	movl %ecx, ShiftedPB	movb %cl, PB	addl $6, CYCLES	movl $0xFFFE, %edx	call S9xGetWord	movl %eax, %edx	andl $0xffff, %edx	call S9xSetPCBase	jmp MainAsmLoop.data.LC1:	.string	"*** IRQ".text.globl S9xOpcode_IRQS9xOpcode_IRQ:#ifdef DEBUGGER	testb $TRACE_FLAG, Flags	je .IRQ_NO_TRACE	pushl $.LC1	ccall S9xTraceMessage	addl $4, %esp.IRQ_NO_TRACE:#endif	testw $Emulation, FLAGS16	jnz .IRQ_EMULATION	movb PB, %al	PushByte IRQ1	movl PC, %eax	subl PCBase, %eax	PushWord IRQ2		S9xPackStatus IRQ	movb FLAGS, %al	movb %al, OpenBus	andb $~Decimal, FLAGS	orb $IRQ, FLAGS		PushByte IRQ3	xorl %ecx, %ecx	movl %ecx, ShiftedPB	movb %cl, PB	addl $12, CYCLES	testb $0xff, SA1Enabled	jz .noirqsa1vector	movl FillRAM, %eax	movb 0x2209(%eax), %dl	testb $0x40, %dl	jz .noirqsa1vector	xorl %edx, %edx	movw 0x220e(%eax), %dx	jmp S9xSetPCBase.noirqsa1vector:	movl $0xFFEE, %edx	call S9xGetWord	movl %eax, %edx	andl $0xffff, %edx	jmp S9xSetPCBase.IRQ_EMULATION:	movl PC, %eax	subl PCBase, %eax	PushWord IRQ4		S9xPackStatus IRQ2	movb FLAGS, %al	movb %al, OpenBus	andb $~Decimal, FLAGS	orb $IRQ, FLAGS		PushByte IRQ5	xorl %ecx, %ecx	movl %ecx, ShiftedPB	movb %cl, PB	addl $6, CYCLES	movl $0xFFFE, %edx	call S9xGetWord	movl %eax, %edx	andl $0xffff, %edx	jmp S9xSetPCBase.data.LC2:	.string	"*** NMI".text.globl S9xOpcode_NMIS9xOpcode_NMI:#ifdef DEBUGGER	testb $TRACE_FLAG, Flags	je .NMI_NO_TRACE	pushl $.LC2	ccall S9xTraceMessage	addl $4, %esp.NMI_NO_TRACE:#endif	testw $Emulation, FLAGS16	jnz .NMI_EMULATION	movb PB, %al	PushByte NMI1	movl PC, %eax	subl PCBase, %eax	PushWord NMI2		S9xPackStatus NMI	movb FLAGS, %al	movb %al, OpenBus	andb $~Decimal, FLAGS	orb $IRQ, FLAGS
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