[IA64] align signal-frame even when not using alternate signal-stack

At the moment, attempting to invoke a signal-handler on the normal
stack is guaranteed to fail if the stack-pointer happens not to be
16-byte aligned.  This is because the signal-trampoline will attempt
to store fp-regs with stf.spill instructions, which will trap for
misaligned addresses.  This isn't terribly useful behavior.  It's
better to just always align the signal frame to the next lower 16-byte
boundary.

Signed-off-by: David Mosberger-Tang <David.Mosberger@acm.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/signal.c

@@ -387,15 +387,14 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 	     struct sigscratch *scr)
 {
 	extern char __kernel_sigtramp[];
-	unsigned long tramp_addr, new_rbs = 0;
+	unsigned long tramp_addr, new_rbs = 0, new_sp;
 	struct sigframe __user *frame;
 	long err;
 
-	frame = (void __user *) scr->pt.r12;
+	new_sp = scr->pt.r12;
 	tramp_addr = (unsigned long) __kernel_sigtramp;
-	if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags((unsigned long) frame) == 0) {
-		frame = (void __user *) ((current->sas_ss_sp + current->sas_ss_size)
-					 & ~(STACK_ALIGN - 1));
+	if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(new_sp) == 0) {
+		new_sp = current->sas_ss_sp + current->sas_ss_size;
 		/*
 		 * We need to check for the register stack being on the signal stack
 		 * separately, because it's switched separately (memory stack is switched
@@ -404,7 +403,7 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 		if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
 			new_rbs = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1);
 	}
-	frame = (void __user *) frame - ((sizeof(*frame) + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1));
+	frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return force_sigsegv_info(sig, frame);