[MIPS] Print more information if we're struck by a machine check exception.

    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 17 insertions, 2 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 35cb08da382..a7564b08eb4 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -819,15 +819,30 @@ asmlinkage void do_watch(struct pt_regs *regs)
 
 asmlinkage void do_mcheck(struct pt_regs *regs)
 {
+        const int field = 2 * sizeof(unsigned long);
+        int multi_match = regs->cp0_status & ST0_TS;
+
         show_regs(regs);
-        dump_tlb_all();
+
+        if (multi_match) {
+                printk("Index   : %0x\n", read_c0_index());
+                printk("Pagemask: %0x\n", read_c0_pagemask());
+                printk("EntryHi : %0*lx\n", field, read_c0_entryhi());
+                printk("EntryLo0: %0*lx\n", field, read_c0_entrylo0());
+                printk("EntryLo1: %0*lx\n", field, read_c0_entrylo1());
+                printk("\n");
+                dump_tlb_all();
+        }
+
+        show_code((unsigned int *) regs->cp0_epc);
+
         /*
          * Some chips may have other causes of machine check (e.g. SB1
          * graduation timer)
          */
         panic("Caught Machine Check exception - %scaused by multiple "
               "matching entries in the TLB.",
-              (regs->cp0_status & ST0_TS) ? "" : "not ");
+              (multi_match) ? "" : "not ");
 }
 
 asmlinkage void do_mt(struct pt_regs *regs)