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Re: sigaltstack setting and RT signal handlers
Paul Mackerras wrote:
> The reason I asked (about signal handlers changing the saved register
> image) is that I am about to add code to save and restore the altivec
> registers on signal delivery. Since most processes don't use altivec
> instructions, and there are 512 bytes of altivec registers, I want to
> avoid saving and restoring the altivec registers for those processes
> that have never used altivec instructions.
If you don't introduce it, it cannot be used.
> Why would a signal handler need to change the sigaltstack setting?
> Can you give me an example?
People do strange things. For every ABI change you have to expect that
it hits somebody.
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