I have some NASM files that generally have the structure: [BITS 64] [ORG 0x0000000000200000] start: ... ret I'm assembling them like so: nasm -f bin abc.asm I'd like to write some of these using GAS instead. Two questions: What directives should I use in GAS? I've found the '.org' directive but GAS doesn't seem to have a '.bits' directive. What should I pass to gcc or as to generate a plain binary file? I.e. what the -f bin option does with NASM.

How to generate plain binaries like nasm -f bin with the GNU GAS assembler?

I have some NASM files that generally have the structure:

        [BITS 64]
        [ORG 0x0000000000200000]

start:
        ...

        ret

I'm assembling them like so:

nasm -f bin abc.asm

I'd like to write some of these using GAS instead. Two questions:

What directives should I use in GAS? I've found the '.org' directive but GAS doesn't seem to have a '.bits' directive.
What should I pass to gcc or as to generate a plain binary file? I.e. what the -f bin option does with NASM.