MIPS: traps: Dump the HTW registers on a MC exception

The HTW registers can be useful to debug a MC exception.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8400/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index dde5d8f..807def5 100644 (file)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1432,6 +1432,11 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
                pr_err("EntryHi : %0*lx\n", field, read_c0_entryhi());
                pr_err("EntryLo0: %0*lx\n", field, read_c0_entrylo0());
                pr_err("EntryLo1: %0*lx\n", field, read_c0_entrylo1());
+               if (cpu_has_htw) {
+                       pr_err("PWField : %0*lx\n", field, read_c0_pwfield());
+                       pr_err("PWSize  : %0*lx\n", field, read_c0_pwsize());
+                       pr_err("PWCtl   : %0x\n", read_c0_pwctl());
+               }
                pr_err("\n");
                dump_tlb_all();
        }