Are we able to move a memory operand to a segment register in these ways using MOV instruction in assembly(x86) language ?
1.
MOV DS,[BX]
2.
MOV DS,[6401H]
Are we able to move a memory operand to a segment register in these
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Are we able to move a memory operand to a segment register in these ways using MOV instruction in assembly(x86) language ?
1.
MOV DS,[BX]
2.
MOV DS,[6401H]
Yes, both addressing modes are valid.
You’ve got this question tagged both Masm and Nasm. They’re not the same, y’know! To convince Masm you want a memory reference, you may need to do
mov ds, ds:[6401h]– strange, I know, but that’s the syntax of the assembler – or was, the last time I used Masm (long time ago!). The redundantds:is optimized away in Masm, Nasm would emit it. If Fasm won’t do this, Fasm is broken (which I doubt! Tomasz is a genius!)… just tried it with Fasm – works fine!Incidentally, 32-bit addresses do involve a segment register – the OS sets ’em up, and it is rare to use ’em in “userland” code, but they’re still there! (64-bit code, no – but I’m less sure of that).