3.6 Data transfer Instructions

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Presentation transcript:

3.6 Data transfer Instructions The XCHG instruction Supposing AX=1234H, BX=5678H XCHG AX, BX After execution of XCHG, BX=1234H, AX=5678H The BSWAP instruction (386+ only) …and after execution of BSWAP EAX EAX before...

3.6 Data transfer Instructions The XLAT instruction Example: Supposing BX=200H, AL=4, DS=100H, Mem(1204H)=55H. XLAT After XLAT, AL=55H The LEA instruction Examples: LEA SI, [200H] The second operand specifies the memory location at the address 200H, so value 200H is loaded into SI MOV SI, [200H] The second operand specifies the memory location at the address 200H, so the content of memory locations at address 200H and 201H is loaded into SI Supposing (BX=20H, DI=1000H): LEA SI, [DI+BX+5H] Value 1025H is loaded into SI.

3.6 Data transfer Instructions The LDS, LES, LFS, LGS, LSS instructions Example: LDS SI, [200H] The content of memory 200H and 201H is loaded into SI, and the content of memory 202H and 203H is loaded into DS. Example: LSS ESP,FWORD PTR NEWSTACK The content of memory from address NEWSTACK to NEWSTACK+5 is loaded into ESP and SS.

3.6 Data transfer Instructions Assembler directives BYTE PTR, WORD PTR, DWORD PTR, FWORD PTR, OFFSET, SEG and DF BYTE PTR = byte pointer => the operand is a byte at the specified address in memory WORD PTR = word pointer => the operand is a word at the specified address in memory DWORD PTR = double word pointer => the operand is a double word at the specified address in memory FWORD PTR = far word pointer => the operand is a far word pointer at the specified address in memory (the four bytes at lower addresses specifying the offset and the other two bytes specifying the segment) When the operand in memory was defined using DB, DW, DD or DF the directives above are useless. DF =define far word => reserves memory space and define such a far word pointer (similar to DB) OFFSET => the operand the offset of the specified address in memory SEG = segment => the operand the value of the segment used to declare the specified data Examples: MOV WORD PTR [SI],5 The value 5 is completed at 16 bits and is loaded into memory at the address specified by DS:SI. LEA DX, MESSAGE MOV DX, OFFSET MESSAGE The same effect , but MOV instruction is faster and shorter MOV AX, SEG MESSAGE MOV DS, AX Identify the segment used when declared data MESSAGE, and load its value in DS (in two steps).