fxemu2.mac

linux下的任天堂模拟器代码。供大家参考。

;Copyright (C) 1997-2007 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
;
;http://www.zsnes.com
;http://sourceforge.net/projects/zsnes
;https://zsnes.bountysource.com
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;version 2 as published by the Free Software Foundation.
;
;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;GNU General Public License for more details.
;
;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.



%macro FETCHPIPE 0
;    mov edx,[SfxPBR]
;    mov edx,[SfxMemTable+edx*4]
;    mov edx,[SfxCPB]
;    mov edx,[SfxR15]
    mov cl,[ebp]
%endmacro

%macro UpdateR14 0
;    mov edx,[SfxROMBR]
;    mov edx,[SfxMemTable+edx*4]
    mov eax,[SfxCROM]
;    and dword[SfxR14],0FFFFh
    add eax,[SfxR14]
    mov [SfxRomBuffer],eax
%endmacro

%macro CLRFLAGS 0
  ;and dword[SfxSFR],0FFFFh-0100h-0200h-1000h  ; Clear ALT1,ALT2 and B Flags
;  xor ch,ch
;  mov dword[SfxB],0         ; Clear B Flag
;  mov esi,SfxR0
;  mov edi,SfxR0
%endmacro

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

%macro WITH 1  ; Verified.
   FETCHPIPE
   mov esi,SfxR0+%1*4
   mov edi,SfxR0+%1*4
   mov dword[SfxB],1
   inc ebp                ; Increase program counter
   call [FxTablec+ecx*4]
   mov esi,SfxR0
   mov edi,SfxR0
   mov dword[SfxB],0         ; Clear B Flag
   ret
%endmacro

%macro STWRN 1  ; V
   mov eax,[SfxR0+%1*4]             ; Read register
   mov ebx,[SfxRAMMem]
   mov [SfxLastRamAdr],eax    ; Save last ram address
   add dword[SfxLastRamAdr],ebx    ; Save last ram address
   mov edx,[esi]            ; Read Source
   FETCHPIPE
   mov [ebx+eax],dl         ; Store Word
   xor eax,1
   inc ebp                ; Increase program counter
   mov [ebx+eax],dh         ; Store Word
   CLRFLAGS
   ret
%endmacro

%macro STBRN 1  ; V
   mov eax,[SfxR0+%1*4]             ; Read register
   FETCHPIPE
   add eax,[SfxRAMMem]
   mov [SfxLastRamAdr],eax    ; Save last ram address
   mov ebx,[esi]            ; Read Source
   mov [eax],bl         ; Store Byte
   CLRFLAGS
   inc ebp                ; Increase program counter
   ret
%endmacro

%macro LDWRN 1  ; V
   mov eax,[SfxR0+%1*4]             ; Read register
   mov ebx,[SfxRAMMem]
   mov [SfxLastRamAdr],eax    ; Save last ram address
   FETCHPIPE
   mov dl,[ebx+eax]         ; Store Word
   add dword[SfxLastRamAdr],ebx    ; Save last ram address
   xor eax,1
   and edx,0FFFFh
   inc ebp                ; Increase program counter
   mov dh,[ebx+eax]         ; Store Word
   mov [edi],edx            ; Read Source
   CLRFLAGS
   ret
%endmacro

%macro LDBRN 1  ; V
   mov eax,[SfxR0+%1*4]             ; Read register
   FETCHPIPE
   add eax,[SfxRAMMem]
   xor ebx,ebx
   mov [SfxLastRamAdr],eax    ; Save last ram address
   mov bl,[eax]                     ; Read Byte
   inc ebp                ; Increase program counter
   mov [edi],ebx            ; Store Result
   CLRFLAGS
   ret
%endmacro

;   test byte[SfxPOR],01h
;   jnz .nozerocheck
;   test byte[SfxPOR],02h
;   jz .nodither

; **** Can pre-calculate [SfxSCBR] << 10 + [sfxramdata]
; Pre-calculate fxbit values from color register

%macro drawpix4b 0
   and [eax],edx
   and [eax+16],edx
   xor edx,0FFFFFFFFh
   mov ebx,[fxbit01pcal]
   and ebx,edx
   or [eax], ebx
   and edx,[fxbit23pcal]
   or [eax+16], edx
%endmacro

%macro drawpix4bd 0
   and [eax],edx
   and [eax+16],edx
   xor edx,0FFFFFFFFh
   mov ebx,[fxbit45pcal]
   and ebx,edx
   or [eax], ebx
   and edx,[fxbit67pcal]
   or [eax+16], edx
%endmacro

%macro drawpix2b 0
   and [eax],edx
   xor edx,0FFFFFFFFh
   and edx,[fxbit01pcal]
   or [eax], edx
%endmacro

%macro drawpix2bd 0
   and [eax],edx
   xor edx,0FFFFFFFFh
   and edx,[fxbit45pcal]
   or [eax], edx
%endmacro

%macro drawpix8b 0
   and [eax],edx
   and [eax+16],edx
   and [eax+32],edx
   and [eax+48],edx
   xor edx,0FFFFFFFFh
   mov ebx,[fxbit01pcal]
   and ebx,edx
   or [eax], ebx
   mov ebx,[fxbit23pcal]
   and ebx,edx
   or [eax+16], ebx
   mov ebx,[fxbit45pcal]
   and ebx,edx
   or [eax+32], ebx
   and edx,[fxbit67pcal]
   or [eax+48], edx
%endmacro

%macro drawpix8bd 0
   and [eax],edx
   and [eax+16],edx
   and [eax+32],edx
   and [eax+48],edx
   xor edx,0FFFFFFFFh
   mov ebx,[fxbit45pcal]
   and ebx,edx
   or [eax], ebx
   mov ebx,[fxbit67pcal]
   and ebx,edx
   or [eax+16], ebx
   mov ebx,[fxbit01pcal]
   and ebx,edx
   or [eax+32], ebx
   and edx,[fxbit23pcal]
   or [eax+48], edx
%endmacro

%macro plotb 5
   shl eax,%3
   and ebx,07h
   add ebx,ebx
   add eax,ebx
   add eax,[SCBRrel]
   mov bl,[SfxR1]
   mov edx,[fxxand+ebx*4]
   %2
%endmacro

%macro plotbz 5
   shl eax,%3
   and ebx,07h
   add ebx,ebx
   add eax,ebx
   add eax,[SCBRrel]
   mov bl,[SfxR1]
   mov edx,[fxxand+ebx*4]
   test byte[SfxCOLR],%5
   jz .nodraw
   %2
%endmacro

%macro plotbd 5
   shl eax,%3
   and ebx,07h
   add ebx,ebx
   add eax,ebx
   add eax,[SCBRrel]
   mov bl,[SfxR1]
   mov edx,[fxxand+ebx*4]
   mov bl,[SfxR1]
   xor bl,[SfxR2]
   test bl,01h
   jz .nodither4b
   %4
   inc word[SfxR1]
   %1
.nodither4b
   %2
%endmacro

%macro plotbzd 5
   shl eax,%3
   and ebx,07h
   add ebx,ebx
   add eax,ebx
   add eax,[SCBRrel]
   mov bl,[SfxR1]
   mov edx,[fxxand+ebx*4]
   test byte[SfxCOLR],%5
   jz near .nodraw
   mov bl,[SfxR1]
   xor bl,[SfxR2]
   test bl,01h
   jz .nodither4b
   %4
   inc word[SfxR1]
   %1
.nodither4b
   %2
%endmacro

%macro plotlines4b 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je near .nodraw
   %1 ret, drawpix4b, 5, drawpix4bd, 0Fh
.nodraw
   inc word[SfxR1]
   ret
%endmacro

%macro plotlines4bb 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je near .nodraw
   %1 FXReturn, drawpix4b, 5, drawpix4bd, 0Fh
.nodraw
   inc word[SfxR1]
   FXReturn
%endmacro

%macro plotlines2b 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je .nodraw
   %1 ret, drawpix2b, 4, drawpix2bd, 03h
.nodraw
   inc word[SfxR1]
   ret
%endmacro

%macro plotlines2bb 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je near .nodraw
   %1 FXReturn, drawpix2b, 4, drawpix2bd, 03h
.nodraw
   inc word[SfxR1]
   FXReturn
%endmacro

%macro plotlines8b 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je near .nodraw
   %1 ret, drawpix8b, 6, drawpix8bd, 0FFh
.nodraw
   inc word[SfxR1]
   ret
%endmacro

%macro plotlines8bb 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je .nodraw
   %1 FXReturn, drawpix8b, 6, drawpix8bd, 0FFh
.nodraw
   inc word[SfxR1]
   FXReturn
%endmacro

%macro plotlines8bl 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je near .nodraw
   %1 ret, drawpix8b, 6, drawpix8bd, 0Fh
.nodraw
   inc word[SfxR1]
   ret
%endmacro

%macro plotlines8bbl 1
   mov ebx,[SfxR2]
   FETCHPIPE
   mov bh,[SfxR1]
   mov eax,[sfxclineloc]
   inc ebp
   mov eax,[eax+ebx*4]
   cmp eax,0FFFFFFFFh
   je .nodraw
   %1 FXReturn, drawpix8b, 6, drawpix8bd, 0Fh
.nodraw
   inc word[SfxR1]
   FXReturn
%endmacro

%macro ADDRN 1  ; V
   mov eax, [esi]    ; Read Source
   mov ebx, [SfxR0+%1*4]
   FETCHPIPE
   add 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 ADCRN 1  ; V
   FETCHPIPE
   mov eax, [esi]    ; Read Source
   mov ebx, [SfxR0+%1*4]
   shr byte[SfxCarry],1
   adc ax,bx
   seto byte[SfxOverflow]
   setc byte[SfxCarry]
   mov [SfxSignZero],eax
   inc ebp                ; Increase program counter