sfxproc.asm

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.
;
%include "i386/macros.mac"
%include "i386/regs.mac"
%include "i386/regsw.mac"

EXTSYM NumberOfOpcodes,SfxB,SfxBRAMR,SfxCBR,SfxCFGR,SfxCLSR,SfxCPB,SfxCROM
EXTSYM SfxCarry,SfxMemTable,SfxOverflow,SfxPBR,SfxPIPE,SfxR0,SfxR1,SfxR10
EXTSYM SfxR11,SfxR12,SfxR13,SfxR14,SfxR15,SfxR2,SfxR3,SfxR4,SfxR5,SfxR6
EXTSYM SfxR7,SfxR8,SfxR9,SfxRAMBR,SfxRAMMem,SfxROMBR,SfxSCBR,SfxSCMR,SfxSFR
EXTSYM SfxSignZero,SfxnRamBanks,StartSFX,debstop,regptr,regptw,sfxramdata
EXTSYM SfxPOR,sfxclineloc
EXTSYM sfx128lineloc,sfx160lineloc,sfx192lineloc,sfxobjlineloc

%macro AssembleSFXFlags 0
    and word[SfxSFR],8F60h
    test byte[SfxCarry],1
    jz .nosfxcarry
    or word[SfxSFR],04h
.nosfxcarry
    cmp word[SfxSignZero],0
    jne .nozero
    or word[SfxSFR],02h
.nozero
    test word[SfxSignZero],8000h
    jz .noneg
    or word[SfxSFR],08h
.noneg
    cmp byte[SfxOverflow],0
    je .noof
    or word[SfxSFR],10h
.noof
    cmp byte[SfxB],0
    je .bzero
    or word[SfxSFR],1000h
.bzero
%endmacro

SECTION .text

NEWSYM initsfxregsr
    setreg 3000h*4,reg3000r
    setreg 3001h*4,reg3001r
    setreg 3002h*4,reg3002r
    setreg 3003h*4,reg3003r
    setreg 3004h*4,reg3004r
    setreg 3005h*4,reg3005r
    setreg 3006h*4,reg3006r
    setreg 3007h*4,reg3007r
    setreg 3008h*4,reg3008r
    setreg 3009h*4,reg3009r
    setreg 300Ah*4,reg300Ar
    setreg 300Bh*4,reg300Br
    setreg 300Ch*4,reg300Cr
    setreg 300Dh*4,reg300Dr
    setreg 300Eh*4,reg300Er
    setreg 300Fh*4,reg300Fr
    setreg 3010h*4,reg3010r
    setreg 3011h*4,reg3011r
    setreg 3012h*4,reg3012r
    setreg 3013h*4,reg3013r
    setreg 3014h*4,reg3014r
    setreg 3015h*4,reg3015r
    setreg 3016h*4,reg3016r
    setreg 3017h*4,reg3017r
    setreg 3018h*4,reg3018r
    setreg 3019h*4,reg3019r
    setreg 301Ah*4,reg301Ar
    setreg 301Bh*4,reg301Br
    setreg 301Ch*4,reg301Cr
    setreg 301Dh*4,reg301Dr
    setreg 301Eh*4,reg301Er
    setreg 301Fh*4,reg301Fr
    setreg 3030h*4,reg3030r
    setreg 3031h*4,reg3031r
    setreg 3032h*4,reg3032r
    setreg 3033h*4,reg3033r
    setreg 3034h*4,reg3034r
    setreg 3035h*4,reg3035r
    setreg 3036h*4,reg3036r
    setreg 3037h*4,reg3037r
    setreg 3038h*4,reg3038r
    setreg 3039h*4,reg3039r
    setreg 303Ah*4,reg303Ar
    setreg 303Bh*4,reg303Br
    setreg 303Ch*4,reg303Cr
    setreg 303Dh*4,reg303Dr
    setreg 303Eh*4,reg303Er
    setreg 303Fh*4,reg303Fr
    ; set 3100-31FF to cacheregr
    mov edi,3100h*4
    add edi,[regptr]
    mov eax,cacheregr
    mov ecx,200h
.loop
    mov [edi],eax
    add edi,4
    dec ecx
    jnz .loop
    ret

NEWSYM initsfxregsw
    setregw 3000h*4,reg3000w
    setregw 3001h*4,reg3001w
    setregw 3002h*4,reg3002w
    setregw 3003h*4,reg3003w
    setregw 3004h*4,reg3004w
    setregw 3005h*4,reg3005w
    setregw 3006h*4,reg3006w
    setregw 3007h*4,reg3007w
    setregw 3008h*4,reg3008w
    setregw 3009h*4,reg3009w
    setregw 300Ah*4,reg300Aw
    setregw 300Bh*4,reg300Bw
    setregw 300Ch*4,reg300Cw
    setregw 300Dh*4,reg300Dw
    setregw 300Eh*4,reg300Ew
    setregw 300Fh*4,reg300Fw
    setregw 3010h*4,reg3010w
    setregw 3011h*4,reg3011w
    setregw 3012h*4,reg3012w
    setregw 3013h*4,reg3013w
    setregw 3014h*4,reg3014w
    setregw 3015h*4,reg3015w
    setregw 3016h*4,reg3016w
    setregw 3017h*4,reg3017w
    setregw 3018h*4,reg3018w
    setregw 3019h*4,reg3019w
    setregw 301Ah*4,reg301Aw
    setregw 301Bh*4,reg301Bw
    setregw 301Ch*4,reg301Cw
    setregw 301Dh*4,reg301Dw
    setregw 301Eh*4,reg301Ew
    setregw 301Fh*4,reg301Fw
    setregw 3030h*4,reg3030w
    setregw 3031h*4,reg3031w
    setregw 3032h*4,reg3032w
    setregw 3033h*4,reg3033w
    setregw 3034h*4,reg3034w
    setregw 3035h*4,reg3035w
    setregw 3036h*4,reg3036w
    setregw 3037h*4,reg3037w
    setregw 3038h*4,reg3038w
    setregw 3039h*4,reg3039w
    setregw 303Ah*4,reg303Aw
    setregw 303Bh*4,reg303Bw
    setregw 303Ch*4,reg303Cw
    setregw 303Dh*4,reg303Dw
    setregw 303Eh*4,reg303Ew
    setregw 303Fh*4,reg303Fw
    ; set 3100-31FF to cacheregw
    mov edi,3100h*4
    add edi,[regptw]
    mov eax,cacheregw
    mov ecx,200h
.loop
    mov [edi],eax
    add edi,4
    dec ecx
    jnz .loop
    ret

NEWSYM cacheregr
    or byte[cachewarning],1
    ret

NEWSYM cacheregw
    or byte[cachewarning],2
    ret

SECTION .data
NEWSYM cachewarning, db 0

SECTION .text

; SFX Registers

NEWSYM reg3000r
    mov al,[SfxR0]
    ret
NEWSYM reg3001r
    mov al,[SfxR0+1]
    ret
NEWSYM reg3002r
    mov al,[SfxR1]
    ret
NEWSYM reg3003r
    mov al,[SfxR1+1]
    ret
NEWSYM reg3004r
    mov al,[SfxR2]
    ret
NEWSYM reg3005r
    mov al,[SfxR2+1]
    ret
NEWSYM reg3006r
    mov al,[SfxR3]
    ret
NEWSYM reg3007r
    mov al,[SfxR3+1]
    ret
NEWSYM reg3008r
    mov al,[SfxR4]
    ret
NEWSYM reg3009r
    mov al,[SfxR4+1]
    ret
NEWSYM reg300Ar
    mov al,[SfxR5]
    ret
NEWSYM reg300Br
    mov al,[SfxR5+1]
    ret
NEWSYM reg300Cr
    mov al,[SfxR6]
    ret
NEWSYM reg300Dr
    mov al,[SfxR6+1]
    ret
NEWSYM reg300Er
    mov al,[SfxR7]
    ret
NEWSYM reg300Fr
    mov al,[SfxR7+1]
    ret
NEWSYM reg3010r
    mov al,[SfxR8]
    ret
NEWSYM reg3011r
    mov al,[SfxR8+1]
    ret
NEWSYM reg3012r
    mov al,[SfxR9]
    ret
NEWSYM reg3013r
    mov al,[SfxR9+1]
    ret
NEWSYM reg3014r
    mov al,[SfxR10]
    ret
NEWSYM reg3015r
    mov al,[SfxR10+1]
    ret
NEWSYM reg3016r
    mov al,[SfxR11]
    ret
NEWSYM reg3017r
    mov al,[SfxR11+1]
    ret
NEWSYM reg3018r
    mov al,[SfxR12]
    ret
NEWSYM reg3019r
    mov al,[SfxR12+1]
    ret
NEWSYM reg301Ar
    mov al,[SfxR13]
    ret
NEWSYM reg301Br
    mov al,[SfxR13+1]
    ret
NEWSYM reg301Cr
    mov al,[SfxR14]
    ret
NEWSYM reg301Dr
    mov al,[SfxR14+1]
    ret
NEWSYM reg301Er
    mov al,[SfxR15]
    ret
NEWSYM reg301Fr
    mov al,[SfxR15+1]
    ret

; Other SFX stuff

NEWSYM reg3030r
    AssembleSFXFlags
    mov al,[SfxSFR]
    ret
NEWSYM reg3031r
    mov al,[SfxSFR+1]
    and byte[SfxSFR+1],07Fh        ; clear IRQ flag
    ret
NEWSYM reg3032r       ; Unused
    xor al,al
    ret
NEWSYM reg3033r       ; BRAMR Backup Ram Read only on/off (bits 1-15 unused)
    mov al,[SfxBRAMR]
    ret
NEWSYM reg3034r       ; PBR (Program Bank)
    mov al,[SfxPBR]
    ret
NEWSYM reg3035r       ; Unused
    xor al,al
    ret
NEWSYM reg3036r       ; ROMBR (Gamepak Rom Bank Register)
    mov al,[SfxROMBR]
    ret
NEWSYM reg3037r       ; CFGR (Control Flags Register)
    mov al,[SfxCFGR]
    ret
NEWSYM reg3038r       ; SCBR (Screen Bank Register)
    mov al,[SfxSCBR]
    ret
NEWSYM reg3039r       ; CLSR (Clock Speed Register)
    mov al,[SfxCLSR]
    ret
NEWSYM reg303Ar       ; SCMR (Screen Mode Register)
    mov al,[SfxSCMR]
    test byte[SfxPOR],10h
    jnz .objmode
    mov al,[SfxSCMR]
    and al,00100100b     ; 4 + 32
    cmp al,4
    je .lines160
    cmp al,32
    je .lines192
    cmp al,36
    je .objmode
    mov eax,[sfx128lineloc]
    jmp .donelines
.lines160
    mov eax,[sfx160lineloc]
    jmp .donelines
.lines192
    mov eax,[sfx192lineloc]
    jmp .donelines
.objmode
    mov eax,[sfxobjlineloc]
.donelines
    mov [sfxclineloc],eax
    ret
NEWSYM reg303Br       ; VCR (Version Code Register)
    mov al,20h
    ret
NEWSYM reg303Cr       ; RAMBR (Ram bank register)
    mov al,[SfxRAMBR]
    ret
NEWSYM reg303Dr       ; Unused
    xor al,al
    ret
NEWSYM reg303Er       ; CBR (Cache Base Register), lower byte
    mov al,[SfxCBR]
    ret
NEWSYM reg303Fr       ; CBR (Cache Base Register), upper byte
    mov al,[SfxCBR+1]
    ret

; SFX Write Registers

NEWSYM reg3000w
    mov [SfxR0],al
    ret
NEWSYM reg3001w
    mov [SfxR0+1],al
    ret
NEWSYM reg3002w
    mov [SfxR1],al
    ret
NEWSYM reg3003w
    mov [SfxR1+1],al
    ret
NEWSYM reg3004w
    mov [SfxR2],al
    ret
NEWSYM reg3005w
    mov [SfxR2+1],al
    ret
NEWSYM reg3006w
    mov [SfxR3],al
    ret
NEWSYM reg3007w
    mov [SfxR3+1],al
    ret
NEWSYM reg3008w
    mov [SfxR4],al
    ret
NEWSYM reg3009w
    mov [SfxR4+1],al
    ret
NEWSYM reg300Aw
    mov [SfxR5],al
    ret
NEWSYM reg300Bw
    mov [SfxR5+1],al
    ret
NEWSYM reg300Cw
    mov [SfxR6],al
    ret
NEWSYM reg300Dw
    mov [SfxR6+1],al
    ret
NEWSYM reg300Ew
    mov [SfxR7],al
    ret
NEWSYM reg300Fw
    mov [SfxR7+1],al
    ret
NEWSYM reg3010w
    mov [SfxR8],al
    ret
NEWSYM reg3011w
    mov [SfxR8+1],al
    ret       
NEWSYM reg3012w
    mov [SfxR9],al
    ret
NEWSYM reg3013w
    mov [SfxR9+1],al
    ret
NEWSYM reg3014w
    mov [SfxR10],al
    ret
NEWSYM reg3015w
    mov [SfxR10+1],al
    ret
NEWSYM reg3016w
    mov [SfxR11],al
    ret
NEWSYM reg3017w
    mov [SfxR11+1],al
    ret
NEWSYM reg3018w
    mov [SfxR12],al
    ret
NEWSYM reg3019w
    mov [SfxR12+1],al
    ret
NEWSYM reg301Aw
    mov [SfxR13],al
    ret
NEWSYM reg301Bw
    mov [SfxR13+1],al
    ret
NEWSYM reg301Cw
    mov [SfxR14],al
    ret
NEWSYM reg301Dw
    mov [SfxR14+1],al
    ret
NEWSYM reg301Ew
    mov [SfxR15],al
    ret
NEWSYM reg301Fw
    mov [SfxR15+1],al
    mov byte[debstop],1
    ; start execution
    push edx
    mov edx,[SfxPBR]
    mov edx,[SfxMemTable+edx*4]
    add edx,[SfxR15]
    mov dl,[edx]
    mov [SfxPIPE],dl
    pop edx
    inc word[SfxR15]
    or byte[SfxSFR],20h
;    call StartSFXret
    ret

; Other SFX stuff

NEWSYM reg3030w
    mov [SfxSFR],al
;    mov dh,10
    ; Disassemble Flags
    test al,20h
    jz .noexec
    pushad
    mov dword [NumberOfOpcodes],100
    call StartSFX
    popad
.noexec
    ret
NEWSYM reg3031w
    mov [SfxSFR+1],al
    ret
NEWSYM reg3032w       ; Unused
    ret
NEWSYM reg3033w       ; BRAMR Backup Ram Read only on/off (bits 1-15 unused)
    and al,0FEh
    mov [SfxBRAMR],al
    ret
NEWSYM reg3034w       ; PBR (Program Bank)
    mov [SfxPBR],al
    xor ebx,ebx
    mov bl,al
    mov ebx,[SfxMemTable+ebx*4]
    mov [SfxCPB],ebx
    ret
NEWSYM reg3035w       ; Unused
    ret
NEWSYM reg3036w       ; ROMBR (Gamepak Rom Bank Register)
    mov [SfxROMBR],al
    xor ebx,ebx
    mov bl,al
    mov ebx,[SfxMemTable+ebx*4]
    mov [SfxCROM],ebx
    ret
NEWSYM reg3037w       ; CFGR (Control Flags Register)
    mov [SfxCFGR],al
    ret
NEWSYM reg3038w       ; SCBR (Screen Bank Register)
    mov [SfxSCBR],al
    ret
NEWSYM reg3039w       ; CLSR (Clock Speed Register)
    and al,0FEh
    mov [SfxCLSR],al
    ret
NEWSYM reg303Aw       ; SCMR (Screen Mode Register)
    mov [SfxSCMR],al
    ret
NEWSYM reg303Bw       ; VCR (Version Code Register)
    ret
NEWSYM reg303Cw       ; RAMBR (Ram bank register)
    mov bl,[SfxnRamBanks]
    dec bl
    and al,bl
    mov ebx,[SfxnRamBanks]
    dec ebx
    and eax,ebx
    mov [SfxRAMBR],eax
    xor ebx,ebx
    mov bl,al
    shl ebx,16
    add ebx,[sfxramdata]
    mov dword [SfxRAMMem],ebx
    ret
NEWSYM reg303Dw       ; Unused
    ret
NEWSYM reg303Ew       ; CBR (Cache Base Register), lower byte
    mov [SfxCBR],al
    ret
NEWSYM reg303Fw       ; CBR (Cache Base Register), upper byte
    mov [SfxCBR+1],al
    ret

NEWSYM sfxaccessbankr8
    mov ebx,[sfxramdata]
    mov al,[ebx+ecx]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw8
    mov ebx,[sfxramdata]
    mov [ebx+ecx],al
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr16
    mov ebx,[sfxramdata]
    mov ax,[ebx+ecx]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw16
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx],ax
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr8b
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov al,[ebx+ecx+65536]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw8b
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536],al
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr16b
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov ax,[ebx+ecx+65536]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw16b
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536],ax
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr8c
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov al,[ebx+ecx+65536*2]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw8c
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536*2],al
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr16c
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov ax,[ebx+ecx+65536*2]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw16c
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536*2],ax
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr8d
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov al,[ebx+ecx+65536*3]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw8d
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536*3],al
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankr16d
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov ax,[ebx+ecx+65536*3]
    xor ebx,ebx
    ret

NEWSYM sfxaccessbankw16d
    mov byte[debstop],1
    mov ebx,[sfxramdata]
    mov [ebx+ecx+65536*3],ax
    xor ebx,ebx
    ret