ASM: operand size mismatch for 'out' error

StackOverflow https://stackoverflow.com/questions/21942562

  •  14-10-2022
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Question

I'm a beginner in ASM programming and I'm trying to read the PIT count. However the following code generates the error: "operand size mismatch for 'out'". (I'm using AT&T syntax) 

movb $0b00000100, %al
outb %al, 0x43

How can I solve it? Thanks for your help!

Was it helpful?

Solution

The following code works:

outb %al, $0x43

Thanks.

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