That convention is nowhere near as common as you present it to be. I was working on systems 30 years ago where the first few arguments were passed in registers.

That convention is nowhere near as common as you present it to be. I was working on systems 30 years ago where the first few arguments were passed in registers. Many such systems. "Everything on the stack" was the rule for register-poor x86, which is why people weaned on DOS/Windows remain attached to it, but even back then it was far from a universal standard.