Re: libcrypto: Illegal instruction ``pshufb'' on non-sse3 CPU

[Masanobu SAITOH <msaitoh%execsw.org@localhost>]

Hi.

On 2015/05/19 10:45, Timo Buhrmester wrote:
> As of late, when building (and installing) -head I end up with a libcrypto causing SIGILL, apparently due to using the ``pshufb'' instruction (which I believe is part of the SSE3 extension).
>
> My CPU is, according to /proc/cpuinfo:

 For x86, /proc/cpuinfo have not maintained for many years...
To avoid this problem, use "cpuctl identify 0" instead of /proc/cpuinfo
to check cpu features (PR#49246).

 Regards.



> > processor	: 0
> > vendor_id	: AuthenticAMD
> > cpu family	: 15
> > model		: 6
> > model name	: AMD Athlon(tm) II X2 265 Processor
> > stepping	: 3
> > cpu MHz		: 3311.46
> > fdiv_bug	: no
> > fpu		: yes
> > fpu_exception	: yes
> > cpuid level	: 5
> > wp		: yes
> > flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht
> >
> > processor	: 1
> > [another core]
>
> (No sse3)
>
>
> As far as gdb is concerned, in libcrypto.so.8.4, this is the point where it blows up:
>     [...]
>    >0x7f7ff6f3ba87  pshufb %xmm6,%xmm0   ;bang
>     0x7f7ff6f3ba8c  add    $0x40,%r9     ;for context
>     0x7f7ff6f3ba90  pshufb %xmm6,%xmm1
>     0x7f7ff6f3ba95  pshufb %xmm6,%xmm2
>     0x7f7ff6f3ba9a  pshufb %xmm6,%xmm3
>     0x7f7ff6f3ba9f  paddd  %xmm9,%xmm0
>
> (Core dump available on request)
>
> The assembly code originates from crypto/external/bsd/openssl/dist/crypto/sha/asm/sha1-x86_64.pl (around line 346), but seems to have been untouched for too long to be the culprit (a -head build in March didn't provoke the problem yet).
>
> Any ideas?


--
-----------------------------------------------
                SAITOH Masanobu (msaitoh%execsw.org@localhost
                                 msaitoh%netbsd.org@localhost)