2 * arch/xtensa/include/asm/traps.h
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 2012 Tensilica Inc.
10 #ifndef _XTENSA_TRAPS_H
11 #define _XTENSA_TRAPS_H
13 #include <asm/ptrace.h>
16 * Per-CPU exception handling data structure.
17 * EXCSAVE1 points to it.
22 /* Double exception save area for a0 */
23 unsigned long double_save;
26 /* For passing a parameter to fixup */
28 /* Fast user exception handlers */
29 void *fast_user_handler[EXCCAUSE_N];
30 /* Fast kernel exception handlers */
31 void *fast_kernel_handler[EXCCAUSE_N];
32 /* Default C-Handlers */
33 void *default_handler[EXCCAUSE_N];
37 * handler must be either of the following:
38 * void (*)(struct pt_regs *regs);
39 * void (*)(struct pt_regs *regs, unsigned long exccause);
41 extern void * __init trap_set_handler(int cause, void *handler);
42 extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
43 void fast_second_level_miss(void);
45 /* Initialize minimal exc_table structure sufficient for basic paging */
46 static inline void __init early_trap_init(void)
48 static struct exc_table exc_table __initdata = {
49 .fast_kernel_handler[EXCCAUSE_DTLB_MISS] =
50 fast_second_level_miss,
52 __asm__ __volatile__("wsr %0, excsave1\n" : : "a" (&exc_table));
55 void secondary_trap_init(void);
57 static inline void spill_registers(void)
59 #if XCHAL_NUM_AREGS > 16
60 __asm__ __volatile__ (
66 #if XCHAL_NUM_AREGS == 32
78 " .rept (" __stringify(XCHAL_NUM_AREGS) " - 16) / 12\n"
83 #if XCHAL_NUM_AREGS % 12 == 0
85 #elif XCHAL_NUM_AREGS % 12 == 4
87 #elif XCHAL_NUM_AREGS % 12 == 8
93 : : : "a8", "a9", "memory");
95 __asm__ __volatile__ (
102 /* Pointer to debug exception handler */
103 void (*debug_exception)(void);
104 /* Temporary register save area */
105 unsigned long debug_save[1];
106 #ifdef CONFIG_HAVE_HW_BREAKPOINT
107 /* Save area for DBREAKC registers */
108 unsigned long dbreakc_save[XCHAL_NUM_DBREAK];
109 /* Saved ICOUNT register */
110 unsigned long icount_save;
111 /* Saved ICOUNTLEVEL register */
112 unsigned long icount_level_save;
116 void debug_exception(void);
118 #endif /* _XTENSA_TRAPS_H */