[PATCH] powerpc: Nicer printing of address at oops

Add nicer printing of faulting address on unresolvable kernel faults.

Makes life a little easier for those who don't know how to decode our
register contents at oops time.

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

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 841d8b6323a8..93d4fbfdb724 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -389,5 +389,22 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
         }
 
         /* kernel has accessed a bad area */
+
+        printk(KERN_ALERT "Unable to handle kernel paging request for ");
+        switch (regs->trap) {
+                case 0x300:
+                case 0x380:
+                        printk("data at address 0x%08lx\n", regs->dar);
+                        break;
+                case 0x400:
+                case 0x480:
+                        printk("instruction fetch\n");
+                        break;
+                default:
+                        printk("unknown fault\n");
+        }
+        printk(KERN_ALERT "Faulting instruction address: 0x%08lx\n",
+                regs->nip);
+
         die("Kernel access of bad area", regs, sig);
 }