Content-Length: 1314 | pFad | https://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/021_fpuinit.patch.sig

untrusted comment: signature from openbsd 6.2 base secret key RWRVWzAMgtyg7iwDDKzr8jqGQilhX2Jb/xXpH/XOwX31dwge3F31LAXborc7cF/t+DJnU9R2a4+D6uz9r484QxtYMHm8qKoRzQc= OpenBSD 6.2 errata 021, August 4, 2018: Incorrect initialization of the FPU caused floating point exceptions when running on Xen. Apply by doing: signify -Vep /etc/signify/openbsd-62-base.pub -x 021_fpuinit.patch.sig \ -m - | (cd /usr/src && patch -p0) And then rebuild and install a new kernel: KK=`sysctl -n kern.osversion | cut -d# -f1` cd /usr/src/sys/arch/`machine`/compile/$KK make obj make config make make install Index: sys/arch/amd64/amd64/cpu.c =================================================================== RCS file: /cvs/src/sys/arch/amd64/amd64/cpu.c,v retrieving revision 1.107.2.2 diff -u -p -r1.107.2.2 cpu.c --- sys/arch/amd64/amd64/cpu.c 22 Jun 2018 13:05:33 -0000 1.107.2.2 +++ sys/arch/amd64/amd64/cpu.c 2 Aug 2018 23:14:56 -0000 @@ -568,6 +568,9 @@ cpu_init(struct cpu_info *ci) /* Give proc0 a clean FPU save area */ sfp = &proc0.p_addr->u_pcb.pcb_savefpu; memset(sfp, 0, fpu_save_len); + sfp->fp_fxsave.fx_fcw = __INITIAL_NPXCW__; + sfp->fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; + fpureset(); if (xsave_mask) { /* must not use xsaveopt here */ xsave(sfp, xsave_mask);

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