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When returning back to user mode, if the lwp has lost the FPU, not only

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clear PSL_FP bit (to force a FPU Unavailable exception) but clear
PSL_FE0 and PSL_FE1 so that the FP execption mode is changes to ignore.
This will prevent spurious FP exceptions being made when the running lwp
doesn't own the FPU.
This commit is contained in:
matt 2004-04-04 16:47:02 +00:00
parent ee2683e797
commit 0d6bda4d21
1 changed files with 2 additions and 2 deletions
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4
sys/arch/powerpc/include/userret.h
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@ -1,4 +1,4 @@
/* $NetBSD: userret.h,v 1.6 2004/02/13 11:36:17 wiz Exp $ */
/* $NetBSD: userret.h,v 1.7 2004/04/04 16:47:02 matt Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -59,7 +59,7 @@ userret(struct lwp *l, struct trapframe *frame)
#ifdef PPC_HAVE_FPU
if ((pcb->pcb_flags & PCB_FPU) &&
(l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) {
frame->srr1 &= ~PSL_FP;
frame->srr1 &= ~(PSL_FP|PSL_FE0|PSL_FE1);
}
#endif
#ifdef ALTIVEC