1 files changed, 42 insertions, 10 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0e17dcb48720..070e96f1773a 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -70,6 +70,7 @@
 #include <asm/hmi.h>
 #include <sysdev/fsl_pci.h>
 #include <asm/kprobes.h>
+#include <asm/stacktrace.h>
 
 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE)
 int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@ -96,6 +97,19 @@ EXPORT_SYMBOL(__debugger_fault_handler);
 #define TM_DEBUG(x...) do { } while(0)
 #endif
 
+static const char *signame(int signr)
+{
+	switch (signr) {
+	case SIGBUS:	return "bus error";
+	case SIGFPE:	return "floating point exception";
+	case SIGILL:	return "illegal instruction";
+	case SIGSEGV:	return "segfault";
+	case SIGTRAP:	return "unhandled trap";
+	}
+
+	return "unknown signal";
+}
+
 /*
  * Trap & Exception support
  */
@@ -301,26 +315,44 @@ void user_single_step_siginfo(struct task_struct *tsk,
 	info->si_addr = (void __user *)regs->nip;
 }
 
+static bool show_unhandled_signals_ratelimited(void)
+{
+	static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
+				      DEFAULT_RATELIMIT_BURST);
+	return show_unhandled_signals && __ratelimit(&rs);
+}
+
+static void show_signal_msg(int signr, struct pt_regs *regs, int code,
+			    unsigned long addr)
+{
+	if (!show_unhandled_signals_ratelimited())
+		return;
+
+	if (!unhandled_signal(current, signr))
+		return;
+
+	pr_info("%s[%d]: %s (%d) at %lx nip %lx lr %lx code %x",
+		current->comm, current->pid, signame(signr), signr,
+		addr, regs->nip, regs->link, code);
+
+	print_vma_addr(KERN_CONT " in ", regs->nip);
+
+	pr_cont("\n");
+
+	show_user_instructions(regs);
+}
 
 void _exception_pkey(int signr, struct pt_regs *regs, int code,
-		unsigned long addr, int key)
+		     unsigned long addr, int key)
 {
 	siginfo_t info;
-	const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \
-			"at %08lx nip %08lx lr %08lx code %x\n";
-	const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \
-			"at %016lx nip %016lx lr %016lx code %x\n";
 
 	if (!user_mode(regs)) {
 		die("Exception in kernel mode", regs, signr);
 		return;
 	}
 
-	if (show_unhandled_signals && unhandled_signal(current, signr)) {
-		printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
-				   current->comm, current->pid, signr,
-				   addr, regs->nip, regs->link, code);
-	}
+	show_signal_msg(signr, regs, code, addr);
 
 	if (arch_irqs_disabled() && !arch_irq_disabled_regs(regs))
 		local_irq_enable();