[POWERPC] Implement logging of unhandled signals

Implement show_unhandled_signals sysctl + support to print when a process
is killed due to unhandled signals just as i386 and x86_64 does.

Default to having it off, unlike x86 that defaults on.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 2f1857c9819f..bf9e39c6e296 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -172,11 +172,21 @@ int die(const char *str, struct pt_regs *regs, long err)
 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
 {
         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)) {
                 if (die("Exception in kernel mode", regs, signr))
                         return;
-        }
+        } else if (show_unhandled_signals &&
+                    unhandled_signal(current, signr) &&
+                    printk_ratelimit()) {
+                        printk(regs->msr & MSR_SF ? fmt64 : fmt32,
+                                current->comm, current->pid, signr,
+                                addr, regs->nip, regs->link, code);
+                }
 
         memset(&info, 0, sizeof(info));
         info.si_signo = signr;