[fpc-pascal] Move with pointers to memory

[Rainer Stratmann]

http://www.freepascal.org/docs-html/rtl/system/move.html

I have a working function in assembler wich copys a memory block from sorce to 
destination.

Now I want it to do with the move function from unit system, but it does not 
work.


procedure wd_copy( s , d : pointer ; l : longint );
begin
 move( s , d , l ); // does not work! Access violation errors
end;


procedure wd_copy( s , d : pointer ; l : longint );
begin
 if l > 0 then begin
  if d < s then begin
   asm
     pushf
     mov   esi,s
     mov   edi,d
     mov   ecx,l
     cld              // vorwärts
     rep   movsb
     popf
   end['EAX','EBX','ECX','EDX','ESI','EDI'];
  end
  else begin
   asm
     pushf
     mov   esi,s
     add   esi,l
     dec   esi
     mov   edi,d
     add   edi,l
     dec   edi
     mov   ecx,l
     std              // rückwärts
     rep   movsb
     popf
   end['EAX','EBX','ECX','EDX','ESI','EDI'];
  end;
 end;
end;