Re: sigreturn on sparc64

["H. Peter Anvin" <hpa@zytor.com>]

David Miller wrote:
> The stub is "returned to" directly from the signal handler itself
> using the "retl" instruction, which jumps to the value of "register
> %i7 plus 8".  We stick the passed in stub address directly into the
> %i7 register of the signal handler frame, that's why you need to
> subtract 8 for the system call argument.

Yup, there are a lot of things like this in the Linux ABI (something which makes sense on 
one architecture, but not across architectures); sigreturn is obviously the worst.

	-hpa