diff options
| -rw-r--r-- | arch/mips/kernel/genex.S | 14 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 13 |
2 files changed, 22 insertions, 5 deletions
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S index 31fa856829cb..47d7583cd67f 100644 --- a/arch/mips/kernel/genex.S +++ b/arch/mips/kernel/genex.S @@ -374,12 +374,20 @@ NESTED(except_vec_nmi, 0, sp) NESTED(nmi_handler, PT_SIZE, sp) .set push .set noat + /* + * Clear ERL - restore segment mapping + * Clear BEV - required for page fault exception handler to work + */ + mfc0 k0, CP0_STATUS + ori k0, k0, ST0_EXL + li k1, ~(ST0_BEV | ST0_ERL) + and k0, k0, k1 + mtc0 k0, CP0_STATUS + _ehb SAVE_ALL move a0, sp jal nmi_exception_handler - RESTORE_ALL - .set mips3 - eret + /* nmi_exception_handler never returns */ .set pop END(nmi_handler) diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index f2ae9cb57ff0..a17b6efb8bfe 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -330,6 +330,7 @@ void show_regs(struct pt_regs *regs) void show_registers(struct pt_regs *regs) { const int field = 2 * sizeof(unsigned long); + mm_segment_t old_fs = get_fs(); __show_regs(regs); print_modules(); @@ -344,9 +345,13 @@ void show_registers(struct pt_regs *regs) printk("*HwTLS: %0*lx\n", field, tls); } + if (!user_mode(regs)) + /* Necessary for getting the correct stack content */ + set_fs(KERNEL_DS); show_stacktrace(current, regs); show_code((unsigned int __user *) regs->cp0_epc); printk("\n"); + set_fs(old_fs); } static int regs_to_trapnr(struct pt_regs *regs) @@ -1488,10 +1493,14 @@ int register_nmi_notifier(struct notifier_block *nb) void __noreturn nmi_exception_handler(struct pt_regs *regs) { + char str[100]; + raw_notifier_call_chain(&nmi_chain, 0, regs); bust_spinlocks(1); - printk("NMI taken!!!!\n"); - die("NMI", regs); + snprintf(str, 100, "CPU%d NMI taken, CP0_EPC=%lx\n", + smp_processor_id(), regs->cp0_epc); + regs->cp0_epc = read_c0_errorepc(); + die(str, regs); } #define VECTORSPACING 0x100 /* for EI/VI mode */ |