Re: [regression] x86/signal/64: Fix SS handling for signals delivered to 64-bit programs breaks dosemu

[Stas Sergeev]

14.08.2015 01:01, Raymond Jennings ÐÐÑÐÑ:
> On 08/13/15 14:46, Linus Torvalds wrote:
> > On Thu, Aug 13, 2015 at 2:42 PM, Raymond Jennings 
> > <shentino@xxxxxxxxx> wrote:
> > > I am curious about what's supposed to happen normally on signal 
> > > delivery.
> > >
> > > Is SS a register that's supposed to be preserved like EIP/RIP and CS 
> > > when a
> > > signal is delivered?
> > What exactly does "supposed" mean?
> Basically, when a process/thread receives a signal, what happens to 
> its registers?
> > So clearly, we're not "supposed" to save/restore it. Because reality
> > matters a hell of a lot more than any theoretical arguments.
> So it still counts as a regression if the kernel pulls the rug out 
> from under someone that was relying on undocumented or buggy behavior?
You probably want to read the whole thread...
Or start from here:
https://lkml.org/lkml/2015/8/12/800
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