Messages in this thread | | | Date | Tue, 6 Aug 2002 00:16:05 +0200 | From | Andi Kleen <> | Subject | Re: context switch vs. signal delivery [was: Re: Accelerating user mode linux] |
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On Mon, Aug 05, 2002 at 11:09:41PM +0100, Jamie Lokier wrote: > Andi Kleen wrote: > > > 2: What happens when the user's signal handler decides it wants to save > > > the FPU state itself (after all) and proceed with some FPU use. Will > > > sigreturn restore the user-saved FPU state? Just curious. > > > > Nope it won't because there is no saved state. The previous context's FPU > > state will be silently corrupted. > > I meant if the user's signal handler decides it wants to save the FPU > state directly into the signal context struct, after deciding to do > that. Won't that work?
In theory yes. The space should be already allocated on the stack, it just has to be filled in.
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