Author: jhibbits
Date: Wed Jan 16 03:52:43 2019
New Revision: 343078
URL: https://svnweb.freebsd.org/changeset/base/343078
Log:
powerpc: Fix FPU fsqrt emulation special case results
If fsqrts is emulated with +INF as its argument, the 0 return value causes a
NULL pointer dereference, panicking the system. Follow the PowerISA and
return +INF with no FP exception.
MFC after: 1 week
Modified:
head/sys/powerpc/fpu/fpu_sqrt.c
Modified: head/sys/powerpc/fpu/fpu_sqrt.c
==============================================================================
--- head/sys/powerpc/fpu/fpu_sqrt.c Wed Jan 16 03:46:27 2019
(r343077)
+++ head/sys/powerpc/fpu/fpu_sqrt.c Wed Jan 16 03:52:43 2019
(r343078)
@@ -226,12 +226,12 @@ fpu_sqrt(struct fpemu *fe)
return (x);
}
if (x->fp_sign) {
+ fe->fe_cx |= FPSCR_VXSQRT;
return (fpu_newnan(fe));
}
if (ISINF(x)) {
- fe->fe_cx |= FPSCR_VXSQRT;
- DUMPFPN(FPE_REG, 0);
- return (0);
+ DUMPFPN(FPE_REG, x);
+ return (x);
}
/*
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