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/*
* arch/xtensa/include/asm/traps.h
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2012 Tensilica Inc.
*/
#ifndef _XTENSA_TRAPS_H
#define _XTENSA_TRAPS_H
#include <asm/ptrace.h>
/*
* handler must be either of the following:
* void (*)(struct pt_regs *regs);
* void (*)(struct pt_regs *regs, unsigned long exccause);
*/
extern void * __init trap_set_handler(int cause, void *handler);
extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
static inline void spill_registers(void)
{
#if XCHAL_NUM_AREGS > 16
__asm__ __volatile__ (
" call12 1f\n"
" _j 2f\n"
" retw\n"
" .align 4\n"
"1:\n"
" _entry a1, 48\n"
" addi a12, a0, 3\n"
#if XCHAL_NUM_AREGS > 32
" .rept (" __stringify(XCHAL_NUM_AREGS) " - 32) / 12\n"
" _entry a1, 48\n"
" mov a12, a0\n"
" .endr\n"
#endif
" _entry a1, 48\n"
#if XCHAL_NUM_AREGS % 12 == 0
" mov a8, a8\n"
#elif XCHAL_NUM_AREGS % 12 == 4
" mov a12, a12\n"
#elif XCHAL_NUM_AREGS % 12 == 8
" mov a4, a4\n"
#endif
" retw\n"
"2:\n"
: : : "a12", "a13", "memory");
#else
__asm__ __volatile__ (
" mov a12, a12\n"
: : : "memory");
#endif
}
#endif /* _XTENSA_TRAPS_H */