diff options
| -rw-r--r-- | arch/mips/kernel/genex.S | 4 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 24 |
2 files changed, 23 insertions, 5 deletions
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S index 01dcbe38fa0..757d48f0d80 100644 --- a/arch/mips/kernel/genex.S +++ b/arch/mips/kernel/genex.S @@ -453,7 +453,11 @@ NESTED(nmi_handler, PT_SIZE, sp) BUILD_HANDLER tr tr sti silent /* #13 */ BUILD_HANDLER fpe fpe fpe silent /* #15 */ BUILD_HANDLER mdmx mdmx sti silent /* #22 */ +#ifdef CONFIG_HARDWARE_WATCHPOINTS + BUILD_HANDLER watch watch sti silent /* #23 */ +#else BUILD_HANDLER watch watch sti verbose /* #23 */ +#endif BUILD_HANDLER mcheck mcheck cli verbose /* #24 */ BUILD_HANDLER mt mt sti silent /* #25 */ BUILD_HANDLER dsp dsp sti silent /* #26 */ diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index b602ac6eb47..80b9e070c20 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -42,6 +42,7 @@ #include <asm/tlbdebug.h> #include <asm/traps.h> #include <asm/uaccess.h> +#include <asm/watch.h> #include <asm/mmu_context.h> #include <asm/types.h> #include <asm/stacktrace.h> @@ -912,13 +913,26 @@ asmlinkage void do_mdmx(struct pt_regs *regs) asmlinkage void do_watch(struct pt_regs *regs) { + u32 cause; + /* - * We use the watch exception where available to detect stack - * overflows. + * Clear WP (bit 22) bit of cause register so we don't loop + * forever. */ - dump_tlb_all(); - show_regs(regs); - panic("Caught WATCH exception - probably caused by stack overflow."); + cause = read_c0_cause(); + cause &= ~(1 << 22); + write_c0_cause(cause); + + /* + * If the current thread has the watch registers loaded, save + * their values and send SIGTRAP. Otherwise another thread + * left the registers set, clear them and continue. + */ + if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) { + mips_read_watch_registers(); + force_sig(SIGTRAP, current); + } else + mips_clear_watch_registers(); } asmlinkage void do_mcheck(struct pt_regs *regs) |