📄 fxemu2b.asm
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;Copyright (C) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
;
;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.
%include "macros.mac"
EXTSYM FxTable,FxTableb,FxTablec,SfxB,SfxCPB,SfxCROM,SfxCarry,SfxOverflow
EXTSYM SfxR0,SfxR14,SfxR15,SfxRomBuffer,SfxSignZero,withr15sk
NEWSYM FxEmu2BAsmStart
%include "chips/fxemu2.mac"
%include "chips/fxemu2b.mac"
NEWSYM FxOpb05 ; BRA branch always ; Verified.
movsx eax,byte[ebp]
mov cl,[ebp+1]
inc ebp
add ebp,eax
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb06 ; BGE branch on greater or equals ; Verified.
movsx eax,byte[ebp]
mov ebx,[SfxSignZero]
shr ebx,15
inc ebp
xor bl,[SfxOverflow]
mov cl,[ebp]
test bl,01h
jnz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb07 ; BLT branch on lesss than ; Verified.
movsx eax,byte[ebp]
mov ebx,[SfxSignZero]
shr ebx,15
inc ebp
xor bl,[SfxOverflow]
mov cl,[ebp]
test bl,01h
jz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb08 ; BNE branch on not equal ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],0FFFFh
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb09 ; BEQ branch on equal (z=1) ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],0FFFFh
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0A ; BPL branch on plus ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],088000h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0B ; BMI branch on minus ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],088000h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0C ; BCC branch on carry clear ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxCarry],01h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0D ; BCS branch on carry set ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxCarry],01h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0E ; BVC branch on overflow clear ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxOverflow],01h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb0F ; BVS branch on overflow set ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxOverflow],01h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTableb+ecx*4]
ret
.nojump
inc ebp
call [FxTableb+ecx*4]
ret
NEWSYM FxOpb10 ; TO RN set register n as destination register
TORNb 0
NEWSYM FxOpb11 ; TO RN set register n as destination register
TORNb 1
NEWSYM FxOpb12 ; TO RN set register n as destination register
TORNb 2
NEWSYM FxOpb13 ; TO RN set register n as destination register
TORNb 3
NEWSYM FxOpb14 ; TO RN set register n as destination register
TORNb 4
NEWSYM FxOpb15 ; TO RN set register n as destination register
TORNb 5
NEWSYM FxOpb16 ; TO RN set register n as destination register
TORNb 6
NEWSYM FxOpb17 ; TO RN set register n as destination register
TORNb 7
NEWSYM FxOpb18 ; TO RN set register n as destination register
TORNb 8
NEWSYM FxOpb19 ; TO RN set register n as destination register
TORNb 9
NEWSYM FxOpb1A ; TO RN set register n as destination register
TORNb 10
NEWSYM FxOpb1B ; TO RN set register n as destination register
TORNb 11
NEWSYM FxOpb1C ; TO RN set register n as destination register
TORNb 12
NEWSYM FxOpb1D ; TO RN set register n as destination register
TORNb 13
NEWSYM FxOpb1E ; TO RN set register n as destination register
FETCHPIPE
test dword [SfxB],1
jnz .VersionB
mov edi,SfxR0+14*4
inc ebp
mov eax,ebp
sub eax,[SfxCPB]
mov dword[withr15sk],1
mov [SfxR15],eax
call [FxTableb+ecx*4]
mov edi,SfxR0
UpdateR14
ret
.VersionB
mov eax,[esi] ; Read Source
mov dword[withr15sk],1
mov [SfxR0+14*4],eax ; Write
CLRFLAGS
UpdateR14
inc ebp ; Increase program counter
ret
NEWSYM FxOpb1F ; TO RN set register n as destination register
FETCHPIPE
test dword [SfxB],1
jnz .VersionB
mov edi,SfxR0+15*4
inc ebp
mov eax,ebp
sub eax,[SfxCPB]
mov [SfxR15],eax
call [FxTableb+ecx*4]
mov ebp,[SfxCPB]
mov dword[withr15sk],1
add ebp,[SfxR15]
mov edi,SfxR0
ret
.VersionB
mov eax,[esi] ; Read Source
mov ebp,[SfxCPB]
mov dword[withr15sk],1
add ebp,eax
CLRFLAGS
ret
NEWSYM FxOpb3D ; ALT1 set alt1 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,01h
inc ebp
mov eax,ebp
sub eax,[SfxCPB]
mov [SfxR15],eax
call [FxTableb+ecx*4]
xor ch,ch
ret
NEWSYM FxOpb3E ; ALT2 set alt1 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,02h
inc ebp
mov eax,ebp
sub eax,[SfxCPB]
mov [SfxR15],eax
call [FxTable+ecx*4]
xor ch,ch
ret
NEWSYM FxOpb3F ; ALT3 set alt3 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,03h
inc ebp
mov eax,ebp
sub eax,[SfxCPB]
mov [SfxR15],eax
call [FxTable+ecx*4]
xor ch,ch
ret
NEWSYM FxOpbB0 ; FROM rn set source register
FROMRNb 0
NEWSYM FxOpbB1 ; FROM rn set source register
FROMRNb 1
NEWSYM FxOpbB2 ; FROM rn set source register
FROMRNb 2
NEWSYM FxOpbB3 ; FROM rn set source register
FROMRNb 3
NEWSYM FxOpbB4 ; FROM rn set source register
FROMRNb 4
NEWSYM FxOpbB5 ; FROM rn set source register
FROMRNb 5
NEWSYM FxOpbB6 ; FROM rn set source register
FROMRNb 6
NEWSYM FxOpbB7 ; FROM rn set source register
FROMRNb 7
NEWSYM FxOpbB8 ; FROM rn set source register
FROMRNb 8
NEWSYM FxOpbB9 ; FROM rn set source register
FROMRNb 9
NEWSYM FxOpbBA ; FROM rn set source register
FROMRNb 10
NEWSYM FxOpbBB ; FROM rn set source register
FROMRNb 11
NEWSYM FxOpbBC ; FROM rn set source register
FROMRNb 12
NEWSYM FxOpbBD ; FROM rn set source register
FROMRNb 13
NEWSYM FxOpbBE ; FROM rn set source register
FROMRNb 14
NEWSYM FxOpbBF ; FROM rn set source register
test dword [SfxB],1
jnz .VersionB
mov esi,SfxR0+15*4
inc ebp ; Increase program counter
mov eax,ebp
sub eax,[SfxCPB]
mov [SfxR15],eax
call [FxTableb+ecx*4]
mov esi,SfxR0
ret
.VersionB
FETCHPIPE
mov eax,ebp
sub eax,[SfxCPB]
inc ebp
mov [edi],eax ; Write Destination
mov [SfxSignZero],eax
shr al,7
mov byte[SfxOverflow],al
CLRFLAGS
ret
NEWSYM FxOpc05 ; BRA branch always ; Verified.
movsx eax,byte[ebp]
mov cl,[ebp+1]
inc ebp
add ebp,eax
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc06 ; BGE branch on greater or equals ; Verified.
movsx eax,byte[ebp]
mov ebx,[SfxSignZero]
shr ebx,15
inc ebp
xor bl,[SfxOverflow]
mov cl,[ebp]
test bl,01h
jnz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc07 ; BLT branch on lesss than ; Verified.
movsx eax,byte[ebp]
mov ebx,[SfxSignZero]
shr ebx,15
inc ebp
xor bl,[SfxOverflow]
mov cl,[ebp]
test bl,01h
jz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc08 ; BNE branch on not equal ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],0FFFFh
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc09 ; BEQ branch on equal (z=1) ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],0FFFFh
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0A ; BPL branch on plus ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],088000h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0B ; BMI branch on minus ; Verified.
movsx eax,byte[ebp]
inc ebp
test dword[SfxSignZero],088000h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0C ; BCC branch on carry clear ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxCarry],01h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0D ; BCS branch on carry set ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxCarry],01h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0E ; BVC branch on overflow clear ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxOverflow],01h
mov cl,[ebp]
jnz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc0F ; BVS branch on overflow set ; Verified.
movsx eax,byte[ebp]
inc ebp
test byte[SfxOverflow],01h
mov cl,[ebp]
jz .nojump
add ebp,eax
call [FxTablec+ecx*4]
ret
.nojump
inc ebp
call [FxTablec+ecx*4]
ret
NEWSYM FxOpc10 ; TO RN set register n as destination register
TORNc 0
NEWSYM FxOpc11 ; TO RN set register n as destination register
TORNc 1
NEWSYM FxOpc12 ; TO RN set register n as destination register
TORNc 2
NEWSYM FxOpc13 ; TO RN set register n as destination register
TORNc 3
NEWSYM FxOpc14 ; TO RN set register n as destination register
TORNc 4
NEWSYM FxOpc15 ; TO RN set register n as destination register
TORNc 5
NEWSYM FxOpc16 ; TO RN set register n as destination register
TORNc 6
NEWSYM FxOpc17 ; TO RN set register n as destination register
TORNc 7
NEWSYM FxOpc18 ; TO RN set register n as destination register
TORNc 8
NEWSYM FxOpc19 ; TO RN set register n as destination register
TORNc 9
NEWSYM FxOpc1A ; TO RN set register n as destination register
TORNc 10
NEWSYM FxOpc1B ; TO RN set register n as destination register
TORNc 11
NEWSYM FxOpc1C ; TO RN set register n as destination register
TORNc 12
NEWSYM FxOpc1D ; TO RN set register n as destination register
TORNc 13
NEWSYM FxOpc1E ; TO RN set register n as destination register
FETCHPIPE
mov eax,[esi] ; Read Source
mov [SfxR0+14*4],eax ; Write
CLRFLAGS
UpdateR14
inc ebp ; Increase program counter
ret
NEWSYM FxOpc1F ; TO RN set register n as destination register
FETCHPIPE
mov eax,[esi] ; Read Source
mov ebp,[SfxCPB]
mov [SfxR15],eax
add ebp,eax
CLRFLAGS
ret
NEWSYM FxOpc3D ; ALT1 set alt1 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,01h
inc ebp
call [FxTablec+ecx*4]
xor ch,ch
ret
NEWSYM FxOpc3E ; ALT2 set alt1 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,02h
inc ebp
call [FxTablec+ecx*4]
xor ch,ch
ret
NEWSYM FxOpc3F ; ALT3 set alt3 mode ; Verified.
FETCHPIPE
mov dword [SfxB],0
or ch,03h
inc ebp
call [FxTablec+ecx*4]
xor ch,ch
ret
NEWSYM FxOpcB0 ; FROM rn set source register
FROMRNc 0
NEWSYM FxOpcB1 ; FROM rn set source register
FROMRNc 1
NEWSYM FxOpcB2 ; FROM rn set source register
FROMRNc 2
NEWSYM FxOpcB3 ; FROM rn set source register
FROMRNc 3
NEWSYM FxOpcB4 ; FROM rn set source register
FROMRNc 4
NEWSYM FxOpcB5 ; FROM rn set source register
FROMRNc 5
NEWSYM FxOpcB6 ; FROM rn set source register
FROMRNc 6
NEWSYM FxOpcB7 ; FROM rn set source register
FROMRNc 7
NEWSYM FxOpcB8 ; FROM rn set source register
FROMRNc 8
NEWSYM FxOpcB9 ; FROM rn set source register
FROMRNc 9
NEWSYM FxOpcBA ; FROM rn set source register
FROMRNc 10
NEWSYM FxOpcBB ; FROM rn set source register
FROMRNc 11
NEWSYM FxOpcBC ; FROM rn set source register
FROMRNc 12
NEWSYM FxOpcBD ; FROM rn set source register
FROMRNc 13
NEWSYM FxOpcBE ; FROM rn set source register
FROMRNc 14
NEWSYM FxOpcBF ; FROM rn set source register
FETCHPIPE
mov eax,ebp
sub eax,[SfxCPB]
inc ebp
mov [edi],eax ; Write Destination
mov [SfxSignZero],eax
shr al,7
mov byte[SfxOverflow],al
CLRFLAGS
ret
NEWSYM FxEmu2BAsmEnd
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