arch/xtensa/include/asm/traps.h

   1 /*
   2  * arch/xtensa/include/asm/traps.h
   3  *
   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
   6  * for more details.
   7  *
   8  * Copyright (C) 2012 Tensilica Inc.
   9  */
  10 #ifndef _XTENSA_TRAPS_H
  11 #define _XTENSA_TRAPS_H
  12
  13 #include <asm/ptrace.h>
  14
  15 /*
  16  * handler must be either of the following:
  17  *  void (*)(struct pt_regs *regs);
  18  *  void (*)(struct pt_regs *regs, unsigned long exccause);
  19  */
  20 extern void * __init trap_set_handler(int cause, void *handler);
  21 extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
  22
  23 static inline void spill_registers(void)
  24 {
  25
  26         __asm__ __volatile__ (
  27                 "movi   a14, "__stringify((1 << PS_EXCM_BIT) | LOCKLEVEL)"\n\t"
  28                 "mov    a12, a0\n\t"
  29                 "rsr    a13, sar\n\t"
  30                 "xsr    a14, ps\n\t"
  31                 "movi   a0, _spill_registers\n\t"
  32                 "rsync\n\t"
  33                 "callx0 a0\n\t"
  34                 "mov    a0, a12\n\t"
  35                 "wsr    a13, sar\n\t"
  36                 "wsr    a14, ps\n\t"
  37                 : :
  38 #if defined(CONFIG_FRAME_POINTER)
  39                 : "a2", "a3", "a4",       "a11", "a12", "a13", "a14", "a15",
  40 #else
  41                 : "a2", "a3", "a4", "a7", "a11", "a12", "a13", "a14", "a15",
  42 #endif
  43                   "memory");
  44 }
  45
  46 #endif /* _XTENSA_TRAPS_H */