Date: Thu, 14 Dec 2017 22:29:28 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 224350] [PATCH] powerpc64: Add handler for Facility Unavailable Message-ID: <bug-224350-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224350 Bug ID: 224350 Summary: [PATCH] powerpc64: Add handler for Facility Unavailable Product: Base System Version: CURRENT Hardware: powerpc OS: Any Status: New Keywords: patch Severity: Affects Some People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: gromero@br.ibm.com Keywords: patch Created attachment 188843 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D188843&action= =3Dedit Patch for this bug Currently Facility Unavailable is absent and once an application tries to use or access a register from a feature disabled in the CPU it causes a kernel panic.=20 A simple test-case is: #include <stdio.h> int main() { asm volatile ("tbegin.;"); } which will use TM (Hardware Transactional Memory) feature which is not supported by the kernel and so I'll trigger the following panic: fatal user trap: exception =3D 0xf60 (unknown) srr0 =3D 0x10000890 srr1 =3D 0x800000000000f032 lr =3D 0x100004e4 curthread =3D 0x5f93000 pid =3D 1021, comm =3D htm panic: unknown trap cpuid =3D 40 KDB: stack backtrace: #0 0x59d1c8 at ??+0 #1 0x59d264 at ??+0 #2 0x959490 at ??+0 #3 0x95a94c at ??+0 #4 0x94ea4c at ??+0 Uptime: 3m18s Dumping 10 MB (3 chunks) chunk 0: 11MB (2648 pages) ... ok chunk 1: 1MB (24 pages) ... ok chunk 2: 1MB (2 pages)panic: IOMMU mapping error: -4 cpuid =3D 40 Uptime: 3m18s This commit fixes that state by adding a handler for Facility Unavailable exception (0xF60), treating the instruction that trigged the exception as an illegal instruction. --=20 You are receiving this mail because: You are the assignee for the bug.=
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