fxemu2b.mac

著名SFC模拟器Snes9x的源代码。

; Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
;
; Super FX assembler emulator code
; (c) Copyright 1998, 1999 zsKnight and _Demo_.
;
; Permission to use, copy, modify and distribute Snes9x in both binary and
; source form, for non-commercial purposes, is hereby granted without fee,
; providing that this license information and copyright notice appear with
; all copies and any derived work.
;
; This software is provided 'as-is', without any express or implied
; warranty. In no event shall the authors be held liable for any damages
; arising from the use of this software.
;
; Snes9x is freeware for PERSONAL USE only. Commercial users should
; seek permission of the copyright holders first. Commercial use includes
; charging money for Snes9x or software derived from Snes9x.
;
; The copyright holders request that bug fixes and improvements to the code
; should be forwarded to them so everyone can benefit from the modifications
; in future versions.
;
; Super NES and Super Nintendo Entertainment System are trademarks of
; Nintendo Co., Limited and its subsidiary companies.
;
%macro TORNb 1   ; V
   FETCHPIPE
   test dword [SfxB],1
   jnz .VersionB
   mov edi, SfxR0+%1*4
   inc ebp                ; Increase program counter
   mov eax,ebp
   sub eax,[SfxCPB]
   mov dword[withr15sk],1
   mov [SfxR15],eax
   call [FxTableb+ecx*4]
   mov edi,SfxR0
   ret
.VersionB
   mov eax,[esi]            ; Read Source
   mov dword[withr15sk],1
   inc ebp                ; Increase program counter
   mov [SfxR0+%1*4],eax             ; Write
   CLRFLAGS
   ret
%endmacro

%macro FROMRNb 1 ; V
   FETCHPIPE
   test dword [SfxB],1
   jnz .VersionB
   mov esi,SfxR0+%1*4
   inc ebp                ; Increase program counter
   call [FxTable+ecx*4]
   mov esi,SfxR0
   ret
.VersionB
   mov eax,[SfxR0+%1*4]             ; Read
   inc ebp
   mov [edi],eax        ; Write Destination
   mov [SfxSignZero],eax
   shr al,7
   mov byte[SfxOverflow],al
   CLRFLAGS
   ret
%endmacro

%macro TORNc 1   ; V
   FETCHPIPE
   mov eax,[esi]            ; Read Source
   inc ebp                ; Increase program counter
   mov [SfxR0+%1*4],eax             ; Write
   CLRFLAGS
   ret
%endmacro


%macro FROMRNc 1 ; V
   FETCHPIPE
   mov eax,[SfxR0+%1*4]             ; Read
   inc ebp
   mov [edi],eax        ; Write Destination
   mov [SfxSignZero],eax
   shr al,7
   mov byte[SfxOverflow],al
   CLRFLAGS
   ret
%endmacro