fxemu2.mac

著名SFC模拟器Snes9x的源代码。

   adc ax,bx
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   mov [SfxSignZero],eax
   inc ebp                ; Increase program counter
   mov [edi],eax      ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro ADIRN 1  ; V
   mov eax, [esi]    ; Read Source
   FETCHPIPE
   add ax,%1
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   mov [SfxSignZero],eax
   inc ebp                ; Increase program counter
   mov [edi],eax      ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro ADCIRN 1 ; V
   FETCHPIPE
   mov eax, [esi]    ; Read Source
   shr byte[SfxCarry],1
   adc ax,%1
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   mov [SfxSignZero],eax
   inc ebp                ; Increase program counter
   mov [edi],eax      ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro SUBRN 1  ; V
   mov eax,[esi]    ; Read Source
   mov ebx,[SfxR0+%1*4]
   FETCHPIPE
   sub ax,bx
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   xor byte[SfxCarry],1
   inc ebp                   ; Increase program counter
   mov [edi],eax                        ; Write Destination
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro SBCRN 1  ; V
   FETCHPIPE
   mov eax,[esi]    ; Read Source
   mov ebx,[SfxR0+%1*4]
   cmp byte[SfxCarry],1
   sbb ax,bx
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   xor byte[SfxCarry],1
   inc ebp                ; Increase program counter
   mov [edi],eax      ; Write Destination
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro SUBIRN 1 ; V
   mov eax,[esi]    ; Read Source
   FETCHPIPE
   sub ax,%1
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   xor byte[SfxCarry],1
   inc ebp                ; Increase program counter
   mov [edi],eax      ; Write Destination
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro CMPRN 1  ; V
   mov eax,[esi]    ; Read Source
   mov ebx,[SfxR0+%1*4]
   FETCHPIPE
   sub ax,bx
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   xor byte[SfxCarry],1
   mov [SfxSignZero],eax
   CLRFLAGS
   inc ebp                ; Increase program counter
   ret
%endmacro

%macro ANDRN 1  ; V
   mov eax,[esi]            ; Read Source
   mov ebx,[SfxR0+%1*4]             ; Read RN
   FETCHPIPE
   and eax,ebx
   inc ebp
   mov dword [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro BICRN 1  ; V
   mov ebx,[SfxR0+%1*4]             ; Read RN
   mov eax,[esi]            ; Read Source
   xor ebx,0FFFFh
   FETCHPIPE
   and eax,ebx
   inc ebp
   mov dword [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro ANDIRN 1 ; V
   mov eax,[esi]            ; Read Source
   FETCHPIPE
   and eax,%1
   inc ebp
   mov dword [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro BICIRN 1 ; V
   mov eax,[esi]            ; Read Source
   FETCHPIPE
   and eax,%1
   inc ebp
   mov dword [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro MULTRN 1 ; V
   mov al,byte [esi]     ; Read Source
   mov bl,byte [SfxR0+%1*4]      ; Read RN
   FETCHPIPE
   imul bl
   inc ebp
   and eax,0FFFFh
   mov [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro UMULTRN 1        ; V
   mov al,byte [esi]     ; Read Source
   mov bl,byte [SfxR0+%1*4]      ; Read RN
   FETCHPIPE
   mul bl
   inc ebp
   and eax,0FFFFh
   mov [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro MULTIRN 1        ; V
   mov al,byte [esi]     ; Read Source
   mov bl,%1                  ; Read RN
   FETCHPIPE
   imul bl
   inc ebp
   and eax,0FFFFh
   mov [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro UMULTIRN 1       ; V
   mov al,byte [esi]     ; Read Source
   mov bl,%1                  ; Read RN
   FETCHPIPE
   mul bl
   inc ebp
   and eax,0FFFFh
   mov [SfxSignZero],eax
   mov [edi],eax            ; Write Destination
   CLRFLAGS
   ret
%endmacro

%macro LINK 1   ; Verified.
   mov eax,ebp
   sub eax,[SfxCPB]
   add eax,%1
   FETCHPIPE
   mov word [SfxR11],ax
   CLRFLAGS
   inc ebp
   ret
%endmacro

%macro JMPRN 1  ; V
   FETCHPIPE
   mov eax,[SfxR0+%1*4]             ; Read RN
   mov ebp,[SfxCPB]
   add ebp,eax
   CLRFLAGS
   ret
%endmacro

%macro LJMPRN 1 ; V
   FETCHPIPE
   mov eax,[SfxR0+%1*4]
   and eax,07Fh
   mov byte[SfxPBR],al
;   mov byte[fxtrace+eax],1
   mov eax,[SfxMemTable+eax*4]
   mov [SfxCPB],eax
   mov ebp,eax
   add ebp,[esi]             ; Read RN
   mov dword [SfxCacheActive],0
   push ecx
   call FxOp02
   pop ecx
   dec ebp
   ret
%endmacro

%macro IBTRN 1  ; V
   movsx eax,byte[ebp]
   mov cl,[ebp+1]
   add ebp,2
   mov [SfxR0+%1*4],ax
   CLRFLAGS
   ret
%endmacro

%macro LMSRN 1  ; Verified.
   xor eax,eax
   mov al,[ebp]
   add eax,eax
   inc ebp
   add eax,[SfxRAMMem]
   mov cl,[ebp]
   mov dword [SfxLastRamAdr],eax
   mov ebx,[eax]              ; Read word from ram
   inc ebp
   mov [SfxR0+%1*4],bx              ; Write data
   CLRFLAGS
   ret
%endmacro

%macro SMSRN 1  ; Verified.
   xor eax,eax
   mov al,[ebp]
   inc ebp
   add eax,eax
   mov cl,[ebp]
   add eax,[SfxRAMMem]
   mov ebx,[SfxR0+%1*4]              ; Read data
   mov dword [SfxLastRamAdr],eax
   inc ebp
   mov [eax],bx              ; Write word to ram
   CLRFLAGS
   ret
%endmacro

%macro FROMRN 1 ; V
   FETCHPIPE
   mov esi,SfxR0+%1*4
   inc ebp                ; Increase program counter
   call [FxTable+ecx*4]
   mov esi,SfxR0
   ret
%endmacro

%macro ORRN 1   ; V
   mov eax,[esi]            ; Read Source
   mov ebx,[SfxR0+%1*4]             ; Read
   FETCHPIPE
   or eax,ebx
   inc ebp
   mov [edi],eax            ; Write DREG
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro XORRN 1  ; V
   mov eax,[esi]            ; Read Source
   mov ebx,[SfxR0+%1*4]             ; Read
   FETCHPIPE
   xor eax,ebx
   inc ebp
   mov [edi],eax            ; Write DREG
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro ORI 1    ; V
   mov eax,[esi]            ; Read Source
   FETCHPIPE
   or eax,%1
   inc ebp
   mov [edi],eax            ; Write DREG
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro XORI 1   ; V
   mov eax,[esi]            ; Read Source
   FETCHPIPE
   xor eax,%1
   inc ebp
   mov [edi],eax            ; Write DREG
   mov [SfxSignZero],eax
   CLRFLAGS
   ret
%endmacro

%macro INCRN 1  ; Verified
   inc word[SfxR0+%1*4]
   FETCHPIPE
   mov eax,[SfxR0+%1*4]            ; Read Source
   mov [SfxSignZero],eax
   CLRFLAGS
   inc ebp
   ret
%endmacro

%macro DECRN 1  ; Verified
   dec word[SfxR0+%1*4]
   FETCHPIPE
   mov eax,[SfxR0+%1*4]            ; Read Source
   mov [SfxR0+%1*4],eax
   mov [SfxSignZero],eax
   CLRFLAGS
   inc ebp
   ret
%endmacro

%macro IWTRN 1  ; aka LEA       ; Verified.
   mov eax,[ebp]
   mov cl,[ebp+2]
   and eax,0FFFFh
   add ebp,3
   mov [SfxR0+%1*4],eax
   CLRFLAGS
   ret
%endmacro

%macro LMRN 1   ; Verified!
   xor eax,eax
   mov cl,[ebp+2]
   mov ax,[ebp]
   mov ebx,[SfxRAMMem]
   mov [SfxLastRamAdr],eax
   add [SfxLastRamAdr],ebx
   mov dl,[eax+ebx]
   xor eax,1
   add ebp,3
   mov dh,[eax+ebx]
   mov word [SfxR0+%1*4],dx         ; Store Word
   CLRFLAGS
   ret
%endmacro

%macro SMRN 1   ; Verified
   mov ebx,[SfxR0+%1*4]
   mov eax,[ebp]
   mov cl,[ebp+2]
   and eax,0FFFFh
   mov dx,bx
   mov ebx,[SfxRAMMem]
   mov [SfxLastRamAdr],eax
   add [SfxLastRamAdr],ebx
   mov [eax+ebx],dl
   xor eax,1
   add ebp,3
   mov [eax+ebx],dh
   CLRFLAGS
   ret
%endmacro

%macro PackEsiEdi 0
   mov eax,[SfxSREG]
   shl eax,2
   add eax,SfxR0
   mov esi,eax
   mov eax,[SfxDREG]
   shl eax,2
   add eax,SfxR0
   mov edi,eax
   mov eax,[SfxRAMBR]
   shl eax,16
   add eax,[sfxramdata]
   mov dword [SfxRAMMem],eax
%endmacro

%macro UnPackEsiEdi 0
   mov eax,esi
   sub eax,SfxR0
   shr eax,2
   mov [SfxSREG],eax
   mov eax,edi
   sub eax,SfxR0
   shr eax,2
   mov [SfxDREG],eax
%endmacro