--- zzzz-none-000/linux-3.10.107/arch/hexagon/kernel/signal.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/hexagon/kernel/signal.c	2021-02-04 17:41:59.000000000 +0000
@@ -36,18 +36,10 @@
 	struct ucontext uc;
 };
 
-static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
 			  size_t frame_size)
 {
-	unsigned long sp = regs->r29;
-
-	/* check if we would overflow the alt stack */
-	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
-		return (void __user __force *)-1UL;
-
-	/* Switch to signal stack if appropriate */
-	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
-		sp = current->sas_ss_sp + current->sas_ss_size;
+	unsigned long sp = sigsp(regs->r29, ksig);
 
 	return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
 }
@@ -112,20 +104,20 @@
 /*
  * Setup signal stack frame with siginfo structure
  */
-static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
-			  sigset_t *set,  struct pt_regs *regs)
+static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+			  struct pt_regs *regs)
 {
 	int err = 0;
 	struct rt_sigframe __user *frame;
 	struct hexagon_vdso *vdso = current->mm->context.vdso;
 
-	frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe));
+	frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(struct rt_sigframe)))
-		goto	sigsegv;
+		return -EFAULT;
 
-	if (copy_siginfo_to_user(&frame->info, info))
-		goto	sigsegv;
+	if (copy_siginfo_to_user(&frame->info, &ksig->info))
+		return -EFAULT;
 
 	/* The on-stack signal trampoline is no longer executed;
 	 * however, the libgcc signal frame unwinding code checks for
@@ -137,29 +129,26 @@
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 	err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
 	if (err)
-		goto sigsegv;
+		return -EFAULT;
 
 	/* Load r0/r1 pair with signumber/siginfo pointer... */
 	regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
-		| (unsigned long long)signr;
+		| (unsigned long long)ksig->sig;
 	regs->r02 = (unsigned long) &frame->uc;
 	regs->r31 = (unsigned long) vdso->rt_signal_trampoline;
 	pt_psp(regs) = (unsigned long) frame;
-	pt_set_elr(regs, (unsigned long)ka->sa.sa_handler);
+	pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
 
 	return 0;
-
-sigsegv:
-	force_sigsegv(signr, current);
-	return -EFAULT;
 }
 
 /*
  * Setup invocation of signal handler
  */
-static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
-			 struct pt_regs *regs)
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 {
+	int ret;
+
 	/*
 	 * If we're handling a signal that aborted a system call,
 	 * set up the error return value before adding the signal
@@ -173,7 +162,7 @@
 			regs->r00 = -EINTR;
 			break;
 		case -ERESTARTSYS:
-			if (!(ka->sa.sa_flags & SA_RESTART)) {
+			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
 				regs->r00 = -EINTR;
 				break;
 			}
@@ -193,11 +182,9 @@
 	 * only set up the rt_frame flavor.
 	 */
 	/* If there was an error on setup, no signal was delivered. */
-	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
-		return;
+	ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
 
-	signal_delivered(sig, info, ka, regs,
-			test_thread_flag(TIF_SINGLESTEP));
+	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
 }
 
 /*
@@ -205,17 +192,13 @@
  */
 void do_signal(struct pt_regs *regs)
 {
-	struct k_sigaction sigact;
-	siginfo_t info;
-	int signo;
+	struct ksignal ksig;
 
 	if (!user_mode(regs))
 		return;
 
-	signo = get_signal_to_deliver(&info, &sigact, regs, NULL);
-
-	if (signo > 0) {
-		handle_signal(signo, &info, &sigact, regs);
+	if (get_signal(&ksig)) {
+		handle_signal(&ksig, regs);
 		return;
 	}
 
@@ -256,7 +239,7 @@
 	sigset_t blocked;
 
 	/* Always make any pending restarted system calls return -EINTR */
-	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+	current->restart_block.fn = do_no_restart_syscall;
 
 	frame = (struct rt_sigframe __user *)pt_psp(regs);
 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))