K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-04-27T04:47:02.294669Z
K 7
svn:log
V 406
MFC 350012: Always set td_errno to the error value of a system call.

Early errors prior to a system call did not set td_errno.  This commit
sets td_errno for all errors during syscallenter().  As a result,
syscallret() can now always use td_errno without checking TDP_NERRNO.

Compared to the original commit, this change preserves the ABI of
struct thread and instead adds explicit zero'ing of td_errno.

END