Converting [symbol + constant] Intel syntax addressing mode to AT&T syntax?

Question

I just cant figure out how to add an offset to my destination when moving a value, specifically in Intel syntax I have:

MOV   [gdtr + 2], EAX

a

Answer 1

Simply write

movl %eax, gdtr+2

Base-offset addressing only works when the offset is a register. There's no point in having an addressing mode to add two constants together; the way this works (regardless of syntax) is that the assembler / linker resolve symbol+constant into a a single number for the displacement field of the instruction encoding.