K 10
svn:author
V 7
bdragon
K 8
svn:date
V 27
2019-08-09T20:16:38.082758Z
K 7
svn:log
V 415
Implement _umtx_op_err.S on powerpc / powerpc64.

As per r177853, we need to avoid using errno inside user mutex code, since
 signal handlers can interfere with it and mess up libthr internal state.

So, implement _umtx_op_err() instead, which makes a raw syscall and
returns the error value directly instead of using errno.

Approved by: jhibbits (mentor)
Differential Revision: https://reviews.freebsd.org/D20946

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