arm64: Use sigsp()

Use sigsp() instead of the open coded variant.
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/arm64/kernel/signal.c

@@ -209,19 +209,13 @@ static int setup_sigframe(struct rt_sigframe __user *sf,
 	return err;
 }
 
-static struct rt_sigframe __user *get_sigframe(struct k_sigaction *ka,
+static struct rt_sigframe __user *get_sigframe(struct ksignal *ksig,
 					       struct pt_regs *regs)
 {
 	unsigned long sp, sp_top;
 	struct rt_sigframe __user *frame;
 
-	sp = sp_top = regs->sp;
-
-	/*
-	 * This is the X/Open sanctioned signal stack switching.
-	 */
-	if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
-		sp = sp_top = current->sas_ss_sp + current->sas_ss_size;
+	sp = sp_top = sigsp(regs->sp, ksig);
 
 	sp = (sp - sizeof(struct rt_sigframe)) & ~15;
 	frame = (struct rt_sigframe __user *)sp;
@@ -259,7 +253,7 @@ static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set,
 	struct rt_sigframe __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs);
+	frame = get_sigframe(ksig, regs);
 	if (!frame)
 		return 1;
 

arch/arm64/kernel/signal32.c

@@ -407,19 +407,13 @@ asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
 	return 0;
 }
 
-static void __user *compat_get_sigframe(struct k_sigaction *ka,
+static void __user *compat_get_sigframe(struct ksignal *ksig,
 					struct pt_regs *regs,
 					int framesize)
 {
-	compat_ulong_t sp = regs->compat_sp;
+	compat_ulong_t sp = sigsp(regs->compat_sp, ksig);
 	void __user *frame;
 
-	/*
-	 * This is the X/Open sanctioned signal stack switching.
-	 */
-	if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
-		sp = current->sas_ss_sp + current->sas_ss_size;
-
 	/*
 	 * ATPCS B01 mandates 8-byte alignment
 	 */
@@ -526,7 +520,7 @@ int compat_setup_rt_frame(int usig, struct ksignal *ksig,
 	struct compat_rt_sigframe __user *frame;
 	int err = 0;
 
-	frame = compat_get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
 
 	if (!frame)
 		return 1;
@@ -555,7 +549,7 @@ int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
 	struct compat_sigframe __user *frame;
 	int err = 0;
 
-	frame = compat_get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
 
 	if (!frame)
 		return 1;