CODEWITHSUNDEEP
assemblynasm
user1013944
user1013944

Reputation:

Same meaning and different outputs

I've been recently studying the 80x86 assembly language with nasm. However, one of those codes that i've been working on pops up an error! Unfortunately, i don't understand why... Would you give me a hand?

.data and .bss

segment .data
minho dd 100
ilseob dd 200

segment .bss
extern _hello
extern _hello2

first .text with no error.

mov eax, [minho]
mov [_hello], eax
mov eax, [ilseob]
mov [_hello2], eax

second .text with an error.

mov dword[_hello], [minho]
mov dword[_hello2], [ilseob]

invalid combination of opcode and operands

Because i'm a newbie in assembly language, there might be a mistake or a mis-understanding...

Upvotes: 0

Views: 46

Answers (1)

Michael
Michael

Reputation: 58437

mem,mem is not a valid combination of operands for MOV. That is, there's no variant of MOV that moves data directly from memory to memory.

Consult the instruction set reference when you're in doubt over which operands you can use.

Upvotes: 2

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