Messages in this thread | | | Date | Mon, 5 Aug 2002 22:30:06 +0100 | From | Jamie Lokier <> | Subject | Re: context switch vs. signal delivery [was: Re: Accelerating user mode linux] |
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A couple of questions.
Andi Kleen wrote: > + err |= setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0], > + (ka->sa.sa_flags&SA_NOFP));
> err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, > - regs, set->sig[0]); > + regs, set->sig[0], !!(ka->sa.sa_flags&SA_NOFP));
1: Why the inconsistency between the two ways the SA_NOFP flag is checked?
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.
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