lazarus do not know ax

[turunk]

i have lazarus 3.8 and can assembler, but lazarus do not recognize ax or eax or rax or bx

Code: Pascal  [Select][+][-]

1. begin
2.   asm
3.     mov ax,bx;
4.     mov eax,ebx;
5.     mov rax,rbx;
6.   end;
7. end.
8.  

[Khrys]

Did you set  {$asmmode intel}? FPC defaults to AT&T syntax (e.g.  movw %bx, %ax)

[turunk]

thank you very much
but now he do not know LES from LES BX,VarMof5;
and error "Error: Asm: 16 or 32 Bit references not supported" at
mov al,[si];

[PascalDragon]

mov al,[si];

For memory references you need to use the correct size matching your architecture, so mov al, [esi] for 32-bit and mov al, [rsi] for 64-bit. mov al, [si] would only work for 16-bit.

[turunk]

i already have tried it with "byte ptr [si]" and "word ptr [si]" .
and has the compiler a problem with LES?

[Khrys]

but now he do not know LES from LES BX,VarMof5;

What platform are you compiling for? If you're on AMD64 (I assume you are), then the default settings (implied  -Px86_64) will prevent that opcode from being used because the hardware in fact doesn't support it  (#UD  raises a hardware exception):

Code: Text  [Select][+][-]

1. 64-BIT_MODE
2.     IF SS is loaded
3.         [...]
4.     ELSE IF attempt to load DS, or ES
5.         THEN #UD;
6.     ELSE IF FS, or GS is loaded with non-NULL segment selector
7.         [...]
8.  

If you're writing 16-bit code you should pass  -Pi8086  to the compiler. This will also fix you issue with  mov al, [si].

[turunk]

is AMD64 not reproducing Intel386?
i typed it here in Lazarus at it is then normal pentium 64 bit

[Thaddy]

It is LEA, not LES.