svn commit: r326870 - in head/sys/powerpc: include powerpc
Justin Hibbits
jhibbits at freebsd.org
Fri Dec 15 04:17:36 UTC 2017
On Thu, Dec 14, 2017 at 10:11 PM, Justin Hibbits <jhibbits at freebsd.org> wrote:
> Author: jhibbits
> Date: Fri Dec 15 04:11:20 2017
> New Revision: 326870
> URL: https://svnweb.freebsd.org/changeset/base/326870
>
> Log:
> Handle the Facility Unavailable exception as a SIGILL
>
> 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.
>
> A simple test-case is:
>
> int main() { asm volatile ("tbegin.;"); }
>
> which will use TM (Hardware Transactional Memory) feature which
> is not supported by the kernel and so will trigger the following
> kernel panic:
>
> ----
>
> fatal user trap:
>
> exception = 0xf60 (unknown)
> srr0 = 0x10000890
> srr1 = 0x800000000000f032
> lr = 0x100004e4
> curthread = 0x5f93000
> pid = 1021, comm = htm
>
> panic: unknown trap
> cpuid = 40
> KDB: stack backtrace:
> 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 = 40
> Uptime: 3m18s
>
> ----
>
> Since Hardware Transactional Memory is not yet supported by FreeBSD, treat
> this as an illegal instruction.
>
> PR: 224350
> Submitted by: Gustavo Romero <gromero_AT_ibm_DOT_com>
... and of course I can't read... missed part of the email address (br.ibm.com)
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