Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PNSZ

--------------------------------

Some fp registers are clobbered in deep-copy_user() because this
function was assumed to be used only in normal task context and to be
safe to clobber caller-save fp registers. However, these assumptions
have been proven wrong.

Since deep-copy_user() is basically a deep-memcpy() with exception
handling, a deep-copy_template() is now used to implement these two
functions. Different macro defines and entry/exit code are used by
deep-copy_user() and deep-memcpy().
Signed-off-by: NMao Minkai <maominkai@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>