Commit 28570e8d authored by Max Filippov's avatar Max Filippov Committed by Chris Zankel
Browse files

xtensa: add trap_set_handler function 



trap_set_handler sets new C-handler in the exception table and returns
previous handler.

Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent c622b29d

arch/xtensa/include/asm/traps.h

0 → 100644
+23 −0
Original line number Diff line number Diff line 
/*

 * 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);



#endif /* _XTENSA_TRAPS_H */

arch/xtensa/kernel/traps.c

+11 −0
Original line number Diff line number Diff line
@@ -293,6 +293,17 @@ do_debug(struct pt_regs *regs) 
}





/* Set exception C handler - for temporary use when probing exceptions */



void * __init trap_set_handler(int cause, void *handler)

{

	unsigned long *entry = &exc_table[EXC_TABLE_DEFAULT / 4 + cause];

	void *previous = (void *)*entry;

	*entry = (unsigned long)handler;

	return previous;

}





/*

 * Initialize dispatch tables.

 *