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If you test it under OS X you need to use the OpenBSD/NetBSD instructions using the FreeBSD code but you will use a 'macho' object file.

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Yep, "nasm -f macho hello.s && ld -e _start -o hello hello.o" did the trick for me on Mac OS X 10.6

I take it you mean Mach-O?

Mach-O is mach microkernel object format.

http://en.wikipedia.org/wiki/Mach-O

In general, BSD assembler tends to be pretty stack heavy for cultural/engineering reasons. I don't think it ultimately matters all that much if you're fiddling around on your personal machine.

In general, BSD assembler tends to be pretty stack heavy for cultural/engineering reasons. I don't think it ultimately matters all that much if you're fiddling around on your personal machine.

I'm not sure I follow?

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