[SPARC]: Add support for *at(), ppoll, and pselect syscalls.

This also includes by necessity _TIF_RESTORE_SIGMASK support,
which actually resulted in a lot of cleanups.

The sparc signal handling code is quite a mess and I should
clean it up some day.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/systbls.S b/arch/sparc/kernel/systbls.S
index e457a40..6877ae4 100644
--- a/arch/sparc/kernel/systbls.S
+++ b/arch/sparc/kernel/systbls.S
@@ -75,7 +75,10 @@
 /*265*/	.long sys_timer_delete, sys_timer_create, sys_nis_syscall, sys_io_setup, sys_io_destroy
 /*270*/	.long sys_io_submit, sys_io_cancel, sys_io_getevents, sys_mq_open, sys_mq_unlink
 /*275*/	.long sys_mq_timedsend, sys_mq_timedreceive, sys_mq_notify, sys_mq_getsetattr, sys_waitid
-/*280*/	.long sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl
+/*280*/	.long sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl, sys_openat
+/*285*/	.long sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, sys_newfstatat
+/*290*/	.long sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
+/*295*/	.long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll
 
 #ifdef CONFIG_SUNOS_EMUL
 	/* Now the SunOS syscall table. */
@@ -181,6 +184,11 @@
 	.long sunos_nosys, sunos_nosys, sunos_nosys
 	.long sunos_nosys
 /*280*/	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
 	.long sunos_nosys
+/*290*/	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
 
 #endif