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assemblers.pas
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(******************************************************************************)
(* This file contans the implementations of the low level procedures and *)
(* functions. Those includes Little-Big endian converter, sign extension *)
(* Bit swappers and low level memory access. *)
(******************************************************************************)
//## 8086 FLAGS LAYOUT
//## F E D C B A 9 8 7 6 5 4 3 2 1 0
//##|_|_|_|_|O|D|I|T|S|Z|_|A|_|P|_|C|
//## 68030 FLAGS LAYOUT
//## |X|N|Z|V|C|
(******************************************************************************)
function cpu68k.lo16(data:longword):word; assembler;
asm
mov eax,data
end;
(******************************************************************************)
function cpu68k.bfGETu(data:longword;offs,dep:byte):longword; assembler;
asm
mov eax,data
mov cl,offs
shl eax,cl
mov ch,$20
sub ch,cl
sub ch,dep
add cl,ch
shr eax,cl
end;
(******************************************************************************)
function cpu68k.bfGETs(data:longword;offs,dep:byte):longword; assembler;
asm
mov eax,data
mov cl,offs
shl eax,cl
mov ch,$20
sub ch,cl
sub ch,dep
add cl,ch
sar eax,cl
end;
function cpu68k.addrcalc(addr1,addr2:pointer):longword; assembler;
asm
push ebx
mov eax,addr1
mov ebx,addr2
sub eax,ebx
pop ebx
end;
Procedure cpu68k.divu64(op1hig,op1low,op2low,op2hig:longword;var reslow,reshig:longword);assembler;
asm
push ebx
push esi
push edi
push ebp
mov ebx, op2low
mov ebp, op2hig
mov ecx, 40h
xor edi, edi
xor esi, esi
@loc_4: shl eax, 1
rcl edx, 1
rcl esi, 1
rcl edi, 1
cmp edi, ebp
jb @loc_2
ja @loc_1
cmp esi, ebx
jb @loc_2
@loc_1: sub esi, ebx
sbb edi, ebp
inc eax
@loc_2: loop @loc_4
@loc_3: pop ebp
mov edi,reslow
mov longword ptr[edi], eax
mov edi,reshig
mov longword ptr[edi], edx
pop edi
pop esi
pop ebx
end;
(******************************************************************************)
function cpu68k.ror8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
ror al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.ror16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
ror ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.ror32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
ror eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rol8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
rol al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rol16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
rol ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rol32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
rol eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shr8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
shr al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shr16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
shr ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shr32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
shr eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shl8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
shl al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shl16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
shl ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.shl32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
shl eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sar8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
sar al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sar16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
sar ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sar32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
sar eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sal8(var b:byte;count:byte):boolean;assembler;
asm
push cx
mov al,byte ptr [b]
mov cl,count
sal al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sal16(var b:word;count:byte):boolean;assembler;
asm
push cx
mov ax,word ptr [b]
mov cl,count
sal ax,cl
mov word ptr[b],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.sal32(var b:longword;count:byte):boolean;assembler;
asm
push cx
mov eax,longword ptr [b]
mov cl,count
sal eax,cl
mov longword ptr[b],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcr8(var b:byte;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov al,byte ptr [b]
mov cl,count
rcr al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcr16(var w:word;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov ax,word ptr [w]
mov cl,count
rcr al,cl
mov word ptr[w],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcr32(var l:longword;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov eax,longword ptr [l]
mov cl,count
rcr al,cl
mov longword ptr[l],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcl8(var b:byte;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov al,byte ptr [b]
mov cl,count
rcl al,cl
mov byte ptr[b],al
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcl16(var w:word;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov ax,word ptr [w]
mov cl,count
rcl al,cl
mov word ptr[w],ax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(******************************************************************************)
function cpu68k.rcl32(var l:longword;count,carry:byte):boolean;assembler;
asm
push cx
mov al,carry
or al,al
clc
jnz @NoCarry
stc
@NoCarry: mov eax,longword ptr [l]
mov cl,count
rcl al,cl
mov longword ptr[l],eax
mov al,0
jnc @fin
inc al
@fin: pop cx
end;
(***********************************************************)
function cpu68k.signext16(w:word):longword;assembler;
asm
push edx
and edx,$0000ffff
or dx,dx
jns @no
or edx,$ffff0000
@no: mov eax,edx
pop edx
end;
(***********************************************************)
function cpu68k.signext8(w:byte):longword;assembler;
asm
push edx
and edx,$000000ff
or dl,dl
jns @no
or edx,$ffffff00
@no: mov eax,edx
pop edx
end;
(***********************************************************)
function cpu68k.LBW(l:longword):longword;assembler;
asm
mov eax,l
xchg al,ah
end;
(***********************************************************)
function cpu68k.LBL(l:longword):longword;assembler;
asm
push ecx
mov eax,l
mov ecx,eax
xchg al,ah
shl eax,16
shr ecx,16
xchg cl,ch
add eax,ecx
pop ecx
end;
(***********************************************************)
function cpu68k.regModSwap(n:byte):byte;assembler;
asm
mov al,n
mov ah,al
and al,$7
and ah,$38
shl al,3
shr ah,3
or al,ah
end;
(***********************************************************)
function cpu68k.getbyte(address:longword;var page):byte;assembler;
asm
push esi
push ecx
mov esi,page
mov ecx,address
add esi,ecx
lodsb
pop ecx
pop esi
end;
(***********************************************************)
function cpu68k.getword(address:longword;var page):word;assembler;
asm
push esi
push ecx
cld
mov esi,page
mov ecx,address
add esi,ecx
lodsw
xchg al,ah
pop ecx
pop esi
end;
(***********************************************************)
function cpu68k.getlongword(address:longword;var page):longword;assembler;
asm
push esi
push ecx
cld
mov esi,page
mov ecx,address
add esi,ecx
lodsw
xchg al,ah
mov cx,ax
shl ecx,16
lodsw
xchg al,ah
and eax,$ffff
add eax,ecx
pop ecx
pop esi
end;
(***********************************************************)
procedure cpu68k.putbyte(address:longword;val:byte;var page);assembler;
asm
push edi
push ecx
push eax
mov al,val
mov edi,page
mov ecx,address
add edi,ecx
stosb
pop eax
pop ecx
pop edi
end;
(***********************************************************)
procedure cpu68k.putword(address:longword;val:word;var page);assembler;
asm
push edi
push ecx
push eax
mov ax,val
mov edi,page
mov ecx,address
add edi,ecx
xchg al,ah
stosw
pop eax
pop ecx
pop edi
end;
(***********************************************************)
procedure cpu68k.putlongword(address,val:longword;var page);assembler;
asm
push edi
push ecx
push eax
mov eax,val
mov edi,page
mov ecx,address
add edi,ecx
mov cx,ax
xchg cl,ch
shl ecx,16
shr eax,16
xchg al,ah
add eax,ecx
stosd
pop eax
pop ecx
pop edi
end;