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powerpc: Fix FPU fsqrt emulation special case results

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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
This commit is contained in:
Justin Hibbits 2019-01-16 03:52:43 +00:00
parent 73f6ccd9e7
commit bd326619e8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=343078
1 changed files with 3 additions and 3 deletions
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6
sys/powerpc/fpu/fpu_sqrt.c
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@ -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);
}
/*