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dozea.asm
executable file
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dozea.asm
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; Doze - Dave's Z80 Emulator - Assembler output
bits 32
section .data
times ($$-$) & 3 db 0
; Z80 Registers
global _Doze
_Doze:
DozeAF dw 0
DozeBC dw 0
DozeDE dw 0
DozeHL dw 0
DozeIX dw 0
DozeIY dw 0
DozePC dw 0
DozeSP dw 0
DozeAF2 dw 0
DozeBC2 dw 0
DozeDE2 dw 0
DozeHL2 dw 0
DozeIR dw 0
DozeIFF dw 0
DozeIM db 0
times ($$-$) & 3 db 0
global _nDozeCycles
_nDozeCycles: dd 0 ; Cycles left (in T-states)
global _nDozeEi
_nDozeEi: dd 0 ; 1 = assembler quit on EI, 2 = assembler did quit on EI
SaveReg: times 6 dd 0
Tmp16: dw 0
TmpFlag: db 0
times ($$-$) & 3 db 0
global _DozeMemFetch
_DozeMemFetch: times 0x100 dd 0
global _DozeMemRead
_DozeMemRead: times 0x100 dd 0
global _DozeMemWrite
_DozeMemWrite: times 0x100 dd 0
section .text
%macro SAVE_REGS 0
push ebx
push ecx
push edx
push esi
push edi
push ebp
%endmacro
%macro RESTORE_REGS 0
pop ebp
pop edi
pop esi
pop edx
pop ecx
pop ebx
%endmacro
%macro DOZE_TO_REG 0
; Load a into al, f into ah
mov ax,word [DozeAF]
ror ax,8
; Load hl into cx
mov cx,word [DozeHL]
mov bl,byte [DozeIR] ; Load bl <- R counter
rol bl,1 ; bl <-- R register bits (65432107)
xor esi,esi
mov si,word [DozePC] ; Load si <- PC
%endmacro
%macro REG_BLANK 0
xor edx,edx ; High 16 bits of edx kept clear
xor edi,edi ; High 16 bits of edi kept clear
%endmacro
%macro REG_TO_DOZE 0
; Save a from al, f from ah
ror ax,8
mov word [DozeAF],ax
; Save hl from cx
mov word [DozeHL],cx
ror bl,1 ; bl --> R register bits 76543210
mov byte [DozeIR],bl ; Save bl -> R counter
mov word [DozePC],si ; Save si -> PC
%endmacro
%macro DAM_FETCH8 0
; Fetch byte (esi) ==> dl
mov dx,si
shr dx,8
mov ebp,dword[_DozeMemFetch+edx*4]
xor edx,edx
mov dl,byte [ebp+esi]
xor ebp,ebp
%endmacro
%macro DAM_FETCH16 0
; Fetch word (esi) ==> dx
mov dx,si
shr dx,8
mov ebp,dword[_DozeMemFetch+edx*4]
xor edx,edx
mov dx,word [ebp+esi]
xor ebp,ebp
%endmacro
%macro DAM_READ8 0
; Read byte (edi) ==> dl
mov ebp,edi
shr bp,8
mov ebp,dword[_DozeMemRead+ebp*4]
test ebp,ebp
jnz %%Direct
call Read
jmp %%Done
%%Direct:
mov dl,byte [ebp+edi]
%%Done:
%endmacro
%macro DAM_WRITE8 0
; Write byte dl ==> (edi)
mov ebp,edi
shr bp,8
mov ebp,dword[_DozeMemWrite+ebp*4]
test ebp,ebp
jnz %%Direct
call Write
jmp %%Done
%%Direct:
mov byte [ebp+edi],dl
%%Done:
%endmacro
%macro DAM_READ16 0
; Read word (edi) ==> dx
inc di
DAM_READ8
dec di
mov dh,dl
DAM_READ8
%endmacro
%macro DAM_WRITE16 0
; Write word dx ==> (edi)
inc di
ror dx,8
DAM_WRITE8
dec di
ror dx,8
DAM_WRITE8
%endmacro
%macro FETCH_OP 0
; Fetch next normal opcode
DAM_FETCH8
inc si
xor dh,dh
jmp [JumpTab+edx*4]
%endmacro
%macro INC_R 0
add bl,2 ; Increase instruction counter R (bit 7 never modified)
%endmacro
times ($$-$) & 3 db 0
extern _DozeRead
Read:
REG_TO_DOZE
push edx
push edi
push edi
call _DozeRead
add esp,4
pop edi
pop edx
mov dl,al
DOZE_TO_REG
ret
times ($$-$) & 3 db 0
extern _DozeWrite
Write:
REG_TO_DOZE
push edx
push edi
push edx
push edi
call _DozeWrite
add esp,8
pop edi
pop edx
DOZE_TO_REG
ret
times ($$-$) & 3 db 0
extern _DozeIn
PortIn:
REG_TO_DOZE
push edx
push edi
push edi
call _DozeIn
add esp,4
pop edi
pop edx
mov dl,al
DOZE_TO_REG
ret
times ($$-$) & 3 db 0
extern _DozeOut
PortOut:
REG_TO_DOZE
push edx
push edi
push edx
push edi
call _DozeOut
add esp,8
pop edi
pop edx
DOZE_TO_REG
ret
times ($$-$) & 3 db 0
; Call a routine
global _DozeAsmCall
_DozeAsmCall:
mov ax,word[esp+4] ; Get address
mov word[Tmp16],ax
SAVE_REGS
REG_BLANK
DOZE_TO_REG
INC_R
sub word [DozeSP],2
mov dx,si
mov di,word [DozeSP]
DAM_WRITE16
mov dx,word[Tmp16]
mov si,dx
REG_TO_DOZE
RESTORE_REGS
ret
times ($$-$) & 3 db 0
; Read a byte from memory
global _DozeAsmRead
_DozeAsmRead:
mov ax,word[esp+4] ; Get address
mov word[Tmp16],ax
SAVE_REGS
REG_BLANK
DOZE_TO_REG
mov di,word [Tmp16]
DAM_READ8
REG_TO_DOZE
xor eax,eax
mov al,dl
RESTORE_REGS
ret
times ($$-$) & 3 db 0
global _DozeAsmRun
_DozeAsmRun:
SAVE_REGS
REG_BLANK
DOZE_TO_REG
FETCH_OP ; Fetch first opcode
DozeRunEnd: ; After cycles have run out, we come back here
REG_TO_DOZE
RESTORE_REGS
ret
; 00 - nop
;****************************************************************
times ($$-$) & 3 db 0
Op00 : INC_R
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op01 : INC_R
; Load Immediate 16-bit
DAM_FETCH16
add si,2
mov word [DozeBC],dx
sub dword [_nDozeCycles],10
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op02 : INC_R
; 02 - ld (bc),a
; Get Save address:
mov di,word [DozeBC]
mov dl,al
DAM_WRITE8 ; Save to address
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op03 : INC_R
inc word [DozeBC]
; (With 16-bit inc, flags aren't changed)
sub dword [_nDozeCycles],6
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op04 : INC_R
and ah,0x01 ; Keep carry flag
inc byte [DozeBC+1]
mov dl,byte [DozeBC+1]
xor dh,dh
or ah,byte [IncFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op05 : INC_R
and ah,0x01 ; Keep carry flag
dec byte [DozeBC+1]
mov dl,byte [DozeBC+1]
xor dh,dh
or ah,byte [DecFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op06 : INC_R
; Load Value 8-bit
DAM_FETCH8
inc si
mov byte [DozeBC+1],dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op07 : INC_R
mov dl,al
sahf
rol dl,1
setc dh ; ---- ---C
and ah,0xc4 ; ..00 0.00
or ah,dh ; ..00 0.0C
mov al,dl
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op08 : INC_R
; 08 - ex af,af'
rol ax,8
mov dx,ax
mov ax,word [DozeAF2]
mov word [DozeAF2],dx
rol ax,8
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op09 : INC_R
mov bh,ah
and bh,0xc4 ; Remember SZ---P--
mov dx,word [DozeBC]
ror ebx,16 ; Get access to a spare bit of ebx
mov bx,dx
mov dx,cx
; Do operation in two bytes to get the correct z80 flags (for the msb)
add dl,bl
adc dh,bh
lahf
mov cx,dx
ror ebx,16 ; Done with ebx
and ah,0x11 ; ---H---C get flags.
and dh,0x28
or ah,dh ; --5H3--C
or ah,bh
sub dword [_nDozeCycles],11
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0A : INC_R
; 0a - ld a,(bc)
; Get Load address:
mov di,word [DozeBC]
DAM_READ8 ; Load from address
mov al,dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0B : INC_R
dec word [DozeBC]
; (With 16-bit inc, flags aren't changed)
sub dword [_nDozeCycles],6
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0C : INC_R
and ah,0x01 ; Keep carry flag
inc byte [DozeBC]
mov dl,byte [DozeBC]
xor dh,dh
or ah,byte [IncFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0D : INC_R
and ah,0x01 ; Keep carry flag
dec byte [DozeBC]
mov dl,byte [DozeBC]
xor dh,dh
or ah,byte [DecFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0E : INC_R
; Load Value 8-bit
DAM_FETCH8
inc si
mov byte [DozeBC],dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op0F : INC_R
mov dl,al
sahf
ror dl,1
setc dh ; ---- ---C
and ah,0xc4 ; ..00 0.00
or ah,dh ; ..00 0.0C
mov al,dl
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op10 : INC_R
inc si
; 10 nn - djnz +nn
mov dl,byte [DozeBC+1]
dec dl
jnz BNotZero0
mov byte [DozeBC+1],dl
sub dword [_nDozeCycles],8
jle near DozeRunEnd
FETCH_OP
BNotZero0:
mov byte [DozeBC+1],dl
; Get Jump offset:
dec si
DAM_FETCH8
inc si
xor dh,dh
xor dl,0x80
sub dx,0x80
add si,dx
sub dword [_nDozeCycles],13
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op11 : INC_R
; Load Immediate 16-bit
DAM_FETCH16
add si,2
mov word [DozeDE],dx
sub dword [_nDozeCycles],10
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op12 : INC_R
; 02 - ld (de),a
; Get Save address:
mov di,word [DozeDE]
mov dl,al
DAM_WRITE8 ; Save to address
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op13 : INC_R
inc word [DozeDE]
; (With 16-bit inc, flags aren't changed)
sub dword [_nDozeCycles],6
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op14 : INC_R
and ah,0x01 ; Keep carry flag
inc byte [DozeDE+1]
mov dl,byte [DozeDE+1]
xor dh,dh
or ah,byte [IncFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op15 : INC_R
and ah,0x01 ; Keep carry flag
dec byte [DozeDE+1]
mov dl,byte [DozeDE+1]
xor dh,dh
or ah,byte [DecFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op16 : INC_R
; Load Value 8-bit
DAM_FETCH8
inc si
mov byte [DozeDE+1],dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op17 : INC_R
mov dl,al
sahf
rcl dl,1
setc dh ; ---- ---C
and ah,0xc4 ; ..00 0.00
or ah,dh ; ..00 0.0C
mov al,dl
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
; 18 nn - jr +nn
;****************************************************************
times ($$-$) & 3 db 0
Op18 : INC_R
; Get Jump offset:
DAM_FETCH8
inc si
xor dh,dh
xor dl,0x80
sub dx,0x80
add si,dx
sub dword [_nDozeCycles],12
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op19 : INC_R
mov bh,ah
and bh,0xc4 ; Remember SZ---P--
mov dx,word [DozeDE]
ror ebx,16 ; Get access to a spare bit of ebx
mov bx,dx
mov dx,cx
; Do operation in two bytes to get the correct z80 flags (for the msb)
add dl,bl
adc dh,bh
lahf
mov cx,dx
ror ebx,16 ; Done with ebx
and ah,0x11 ; ---H---C get flags.
and dh,0x28
or ah,dh ; --5H3--C
or ah,bh
sub dword [_nDozeCycles],11
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1A : INC_R
; 0a - ld a,(de)
; Get Load address:
mov di,word [DozeDE]
DAM_READ8 ; Load from address
mov al,dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1B : INC_R
dec word [DozeDE]
; (With 16-bit inc, flags aren't changed)
sub dword [_nDozeCycles],6
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1C : INC_R
and ah,0x01 ; Keep carry flag
inc byte [DozeDE]
mov dl,byte [DozeDE]
xor dh,dh
or ah,byte [IncFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1D : INC_R
and ah,0x01 ; Keep carry flag
dec byte [DozeDE]
mov dl,byte [DozeDE]
xor dh,dh
or ah,byte [DecFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1E : INC_R
; Load Value 8-bit
DAM_FETCH8
inc si
mov byte [DozeDE],dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op1F : INC_R
mov dl,al
sahf
rcr dl,1
setc dh ; ---- ---C
and ah,0xc4 ; ..00 0.00
or ah,dh ; ..00 0.0C
mov al,dl
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op20 : INC_R
inc si
sahf ; Get flags so we can test for the condition
jz ConditionFalse0
; Get Jump offset:
dec si
DAM_FETCH8
inc si
xor dl,0x80
xor dh,dh
sub dx,0x80
add si,dx
sub dword [_nDozeCycles],12
jle near DozeRunEnd
FETCH_OP
ConditionFalse0:
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op21 : INC_R
; Load Immediate 16-bit
DAM_FETCH16
add si,2
mov cx,dx
sub dword [_nDozeCycles],10
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op22 : INC_R
; Direct access to a memory location
DAM_FETCH16
add si,2
mov di,dx
mov dx,cx
DAM_WRITE16
sub dword [_nDozeCycles],16
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op23 : INC_R
inc cx
; (With 16-bit inc, flags aren't changed)
sub dword [_nDozeCycles],6
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op24 : INC_R
and ah,0x01 ; Keep carry flag
inc ch
mov dl,ch
xor dh,dh
or ah,byte [IncFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op25 : INC_R
and ah,0x01 ; Keep carry flag
dec ch
mov dl,ch
xor dh,dh
or ah,byte [DecFlag+edx]
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op26 : INC_R
; Load Value 8-bit
DAM_FETCH8
inc si
mov ch,dl
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op27 : INC_R
; 27 - daa
mov dh,ah
ror dh,2 ;H-- ---- ----
and dx,0x400
and ax,0x3ff
or dx,ax ; HNC nnnn nnnn
mov ax,word[DaaTable+edx*2] ; Get flags and value in one go
sub dword [_nDozeCycles],4
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op28 : INC_R
inc si
sahf ; Get flags so we can test for the condition
jnz ConditionFalse1
; Get Jump offset:
dec si
DAM_FETCH8
inc si
xor dl,0x80
xor dh,dh
sub dx,0x80
add si,dx
sub dword [_nDozeCycles],12
jle near DozeRunEnd
FETCH_OP
ConditionFalse1:
sub dword [_nDozeCycles],7
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op29 : INC_R
mov bh,ah
and bh,0xc4 ; Remember SZ---P--
mov dx,cx
ror ebx,16 ; Get access to a spare bit of ebx
mov bx,dx
mov dx,cx
; Do operation in two bytes to get the correct z80 flags (for the msb)
add dl,bl
adc dh,bh
lahf
mov cx,dx
ror ebx,16 ; Done with ebx
and ah,0x11 ; ---H---C get flags.
and dh,0x28
or ah,dh ; --5H3--C
or ah,bh
sub dword [_nDozeCycles],11
jle near DozeRunEnd
FETCH_OP
;****************************************************************
times ($$-$) & 3 db 0
Op2A : INC_R
; Direct access to a memory location