fxemu2b.mac

十七种模拟器源代码 非常有用的作课程设计不可缺少的

;Copyright (C) 1997-2001 ZSNES Team ( [e-mail] / [e-mail] )
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;as published by the Free Software Foundation; either
;version 2 of the License, or (at your option) any later
;version.
;
;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 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