1 files changed, 45 insertions, 14 deletions

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 318efd784a0b..59eaf6227af1 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -36,6 +36,7 @@
 #include <linux/sysrq.h>
 #include <linux/nmi.h>
 #include <linux/context_tracking.h>
+#include <linux/signal.h>
 
 #include <linux/uaccess.h>
 #include <asm/page.h>
@@ -518,17 +519,15 @@ void synchronize_user_stack(void)
 
 static void stack_unaligned(unsigned long sp)
 {
-	siginfo_t info;
-
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRALN;
-	info.si_addr = (void __user *) sp;
-	info.si_trapno = 0;
-	force_sig_info(SIGBUS, &info, current);
+	force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp, 0, current);
 }
 
-void fault_in_user_windows(void)
+static const char uwfault32[] = KERN_INFO \
+	"%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n";
+static const char uwfault64[] = KERN_INFO \
+	"%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n";
+
+void fault_in_user_windows(struct pt_regs *regs)
 {
 	struct thread_info *t = current_thread_info();
 	unsigned long window;
@@ -541,9 +540,9 @@ void fault_in_user_windows(void)
 		do {
 			struct reg_window *rwin = &t->reg_window[window];
 			int winsize = sizeof(struct reg_window);
-			unsigned long sp;
+			unsigned long sp, orig_sp;
 
-			sp = t->rwbuf_stkptrs[window];
+			orig_sp = sp = t->rwbuf_stkptrs[window];
 
 			if (test_thread_64bit_stack(sp))
 				sp += STACK_BIAS;
@@ -554,8 +553,16 @@ void fault_in_user_windows(void)
 				stack_unaligned(sp);
 
 			if (unlikely(copy_to_user((char __user *)sp,
-						  rwin, winsize)))
+						  rwin, winsize))) {
+				if (show_unhandled_signals)
+					printk_ratelimited(is_compat_task() ?
+							   uwfault32 : uwfault64,
+							   current->comm, current->pid,
+							   sp, orig_sp,
+							   regs->tpc,
+							   regs->u_regs[UREG_I7]);
 				goto barf;
+			}
 		} while (window--);
 	}
 	set_thread_wsaved(0);
@@ -563,8 +570,7 @@ void fault_in_user_windows(void)
 
 barf:
 	set_thread_wsaved(window + 1);
-	user_exit();
-	do_exit(SIGILL);
+	force_sig(SIGSEGV, current);
 }
 
 asmlinkage long sparc_do_fork(unsigned long clone_flags,
@@ -670,6 +676,31 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	return 0;
 }
 
+/* TIF_MCDPER in thread info flags for current task is updated lazily upon
+ * a context switch. Update this flag in current task's thread flags
+ * before dup so the dup'd task will inherit the current TIF_MCDPER flag.
+ */
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+	if (adi_capable()) {
+		register unsigned long tmp_mcdper;
+
+		__asm__ __volatile__(
+			".word 0x83438000\n\t"	/* rd  %mcdper, %g1 */
+			"mov %%g1, %0\n\t"
+			: "=r" (tmp_mcdper)
+			:
+			: "g1");
+		if (tmp_mcdper)
+			set_thread_flag(TIF_MCDPER);
+		else
+			clear_thread_flag(TIF_MCDPER);
+	}
+
+	*dst = *src;
+	return 0;
+}
+
 typedef struct {
 	union {
 		unsigned int	pr_regs[32];