diff options
Diffstat (limited to 'arch/xtensa/include/asm/traps.h')
| -rw-r--r-- | arch/xtensa/include/asm/traps.h | 70 |
1 files changed, 65 insertions, 5 deletions
diff --git a/arch/xtensa/include/asm/traps.h b/arch/xtensa/include/asm/traps.h index 2e69aa4b843f..212c3b9ff407 100644 --- a/arch/xtensa/include/asm/traps.h +++ b/arch/xtensa/include/asm/traps.h @@ -12,17 +12,76 @@ #include <asm/ptrace.h> +typedef void xtensa_exception_handler(struct pt_regs *regs); + /* - * handler must be either of the following: - * void (*)(struct pt_regs *regs); - * void (*)(struct pt_regs *regs, unsigned long exccause); + * Per-CPU exception handling data structure. + * EXCSAVE1 points to it. */ -extern void * __init trap_set_handler(int cause, void *handler); -extern void do_unhandled(struct pt_regs *regs, unsigned long exccause); +struct exc_table { + /* Kernel Stack */ + void *kstk; + /* Double exception save area for a0 */ + unsigned long double_save; + /* Fixup handler */ + void *fixup; + /* For passing a parameter to fixup */ + void *fixup_param; +#if XTENSA_HAVE_COPROCESSORS + /* Pointers to owner struct thread_info */ + struct thread_info *coprocessor_owner[XCHAL_CP_MAX]; +#endif + /* Fast user exception handlers */ + void *fast_user_handler[EXCCAUSE_N]; + /* Fast kernel exception handlers */ + void *fast_kernel_handler[EXCCAUSE_N]; + /* Default C-Handlers */ + xtensa_exception_handler *default_handler[EXCCAUSE_N]; +}; + +DECLARE_PER_CPU(struct exc_table, exc_table); + +xtensa_exception_handler * +__init trap_set_handler(int cause, xtensa_exception_handler *handler); + +asmlinkage void fast_illegal_instruction_user(void); +asmlinkage void fast_syscall_user(void); +asmlinkage void fast_alloca(void); +asmlinkage void fast_load_store(void); +asmlinkage void fast_unaligned(void); +asmlinkage void fast_second_level_miss(void); +asmlinkage void fast_store_prohibited(void); +asmlinkage void fast_coprocessor(void); + +asmlinkage void kernel_exception(void); +asmlinkage void user_exception(void); +asmlinkage void system_call(struct pt_regs *regs); + +void do_IRQ(int hwirq, struct pt_regs *regs); +void do_page_fault(struct pt_regs *regs); +void do_unhandled(struct pt_regs *regs); + +/* Initialize minimal exc_table structure sufficient for basic paging */ +static inline void __init early_trap_init(void) +{ + static struct exc_table init_exc_table __initdata = { +#ifdef CONFIG_XTENSA_LOAD_STORE + .fast_kernel_handler[EXCCAUSE_LOAD_STORE_ERROR] = + fast_load_store, +#endif +#ifdef CONFIG_MMU + .fast_kernel_handler[EXCCAUSE_DTLB_MISS] = + fast_second_level_miss, +#endif + }; + xtensa_set_sr(&init_exc_table, excsave1); +} + void secondary_trap_init(void); static inline void spill_registers(void) { +#if defined(__XTENSA_WINDOWED_ABI__) #if XCHAL_NUM_AREGS > 16 __asm__ __volatile__ ( " call8 1f\n" @@ -63,6 +122,7 @@ static inline void spill_registers(void) " mov a12, a12\n" : : : "memory"); #endif +#endif } struct debug_table { |