diff options
Diffstat (limited to 'arch/xtensa/kernel/traps.c')
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 69 |
1 files changed, 52 insertions, 17 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 42d441f7898b..d02fc304b31c 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -39,11 +39,7 @@ #include <asm/pgtable.h> #include <asm/processor.h> #include <asm/traps.h> - -#ifdef CONFIG_KGDB -extern int gdb_enter; -extern int return_from_debug_flag; -#endif +#include <asm/hw_breakpoint.h> /* * Machine specific interrupt handlers @@ -162,6 +158,8 @@ COPROCESSOR(7), DEFINE_PER_CPU(unsigned long, exc_table[EXC_TABLE_SIZE/4]); +DEFINE_PER_CPU(struct debug_table, debug_table); + void die(const char*, struct pt_regs*, long); static inline void @@ -205,6 +203,32 @@ extern void do_IRQ(int, struct pt_regs *); #if XTENSA_FAKE_NMI +#define IS_POW2(v) (((v) & ((v) - 1)) == 0) + +#if !(PROFILING_INTLEVEL == XCHAL_EXCM_LEVEL && \ + IS_POW2(XTENSA_INTLEVEL_MASK(PROFILING_INTLEVEL))) +#warning "Fake NMI is requested for PMM, but there are other IRQs at or above its level." +#warning "Fake NMI will be used, but there will be a bugcheck if one of those IRQs fire." + +static inline void check_valid_nmi(void) +{ + unsigned intread = get_sr(interrupt); + unsigned intenable = get_sr(intenable); + + BUG_ON(intread & intenable & + ~(XTENSA_INTLEVEL_ANDBELOW_MASK(PROFILING_INTLEVEL) ^ + XTENSA_INTLEVEL_MASK(PROFILING_INTLEVEL) ^ + BIT(XCHAL_PROFILING_INTERRUPT))); +} + +#else + +static inline void check_valid_nmi(void) +{ +} + +#endif + irqreturn_t xtensa_pmu_irq_handler(int irq, void *dev_id); DEFINE_PER_CPU(unsigned long, nmi_count); @@ -219,6 +243,7 @@ void do_nmi(struct pt_regs *regs) old_regs = set_irq_regs(regs); nmi_enter(); ++*this_cpu_ptr(&nmi_count); + check_valid_nmi(); xtensa_pmu_irq_handler(0, NULL); nmi_exit(); set_irq_regs(old_regs); @@ -314,23 +339,22 @@ do_unaligned_user (struct pt_regs *regs) } #endif +/* Handle debug events. + * When CONFIG_HAVE_HW_BREAKPOINT is on this handler is called with + * preemption disabled to avoid rescheduling and keep mapping of hardware + * breakpoint structures to debug registers intact, so that + * DEBUGCAUSE.DBNUM could be used in case of data breakpoint hit. + */ void do_debug(struct pt_regs *regs) { -#ifdef CONFIG_KGDB - /* If remote debugging is configured AND enabled, we give control to - * kgdb. Otherwise, we fall through, perhaps giving control to the - * native debugger. - */ - - if (gdb_enter) { - extern void gdb_handle_exception(struct pt_regs *); - gdb_handle_exception(regs); - return_from_debug_flag = 1; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int ret = check_hw_breakpoint(regs); + + preempt_enable(); + if (ret == 0) return; - } #endif - __die_if_kernel("Breakpoint in kernel", regs, SIGKILL); /* If in user mode, send SIGTRAP signal to current process */ @@ -364,6 +388,15 @@ static void trap_init_excsave(void) __asm__ __volatile__("wsr %0, excsave1\n" : : "a" (excsave1)); } +static void trap_init_debug(void) +{ + unsigned long debugsave = (unsigned long)this_cpu_ptr(&debug_table); + + this_cpu_ptr(&debug_table)->debug_exception = debug_exception; + __asm__ __volatile__("wsr %0, excsave" __stringify(XCHAL_DEBUGLEVEL) + :: "a"(debugsave)); +} + /* * Initialize dispatch tables. * @@ -407,12 +440,14 @@ void __init trap_init(void) /* Initialize EXCSAVE_1 to hold the address of the exception table. */ trap_init_excsave(); + trap_init_debug(); } #ifdef CONFIG_SMP void secondary_trap_init(void) { trap_init_excsave(); + trap_init_debug(); } #endif |