no such instructions: xsave, xsetbv, xrstor

Scot Hetzel swhetzel at
Thu Aug 2 02:07:51 UTC 2012

On Wed, Aug 1, 2012 at 8:35 PM, mike andrews <mikea at> wrote:
> On Sat, Jul 21, 2012 at 07:55:23PM +0200, Arvydas Sidorenko wrote:
>> This is the output I get when building 10-CURRENT from HEAD:
>> /usr/src/sys/amd64/amd64/cpu_switch.S: Assembler messages:
>> /usr/src/sys/amd64/amd64/cpu_switch.S:128: Error: no such instruction:
>> `xsave (%r8)'
>> /usr/src/sys/amd64/amd64/cpu_switch.S:504: Error: no such instruction:
>> `xsetbv'
>> /usr/src/sys/amd64/amd64/cpu_switch.S:505: Error: no such instruction:
>> `xrstor (%rbx)'
> Apologies for not replying into the thread, but I just subscribed and
> don't have that luxury until some listmail arrives for this thread.
> I'm getting the same problem doing a `make buildkernel KERNCONF=GENERIC`
> on an amd64 system (Intel core i5 4-way):
Did you do a `make clean && make buildworld` before your `make buildkernel`?


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