a = FFFF8002h
b = 00004321h
The words or bytes contained in the register or effective address are read by movsx. The 16- or 32-bit value is subsequently sign-extended to the operand-size attribute of the instruction via movsx. Movesx stores the outcome in the final register.
A few restrictions apply to the MOV instruction: Directly moving an immediate value into a segment register (moving ds,10) is not possible. Directly copying a segment register is also not possible (i.e. mov es,ds) It is impossible to copy one memory region into another memory location (i.e. mov aNumber,aDigit)
A mnemonic for copying data from one place to another in the x86 assembly language is MOV (x86 instruction).
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