rt_sigaction.h: ARC: Provide default sa_restorer

LTP tests the raw (non libc) sigaction ABI to kernel such as validation
of various params.

sigaction on ARC relies on default userspace sa restorer to invoke a
sigreturn syscall when returning from a signal handler. Thus libc provides
a default sa restorer.

LTP tests the raw sigaction syscall ABI (w/o libc) hence needs the
restorer userspace infrastructure, which this patch provides for ARC.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
1 file changed