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| author | Max Filippov <jcmvbkbc@gmail.com> | 2012-11-19 04:30:15 (GMT) |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2012-12-19 05:10:22 (GMT) |
| commit | 28570e8dac5c86ab10ce2a7e9c02d3aaece63760 (patch) | |
| tree | 29a915825b1851c1377d88bdb008a0eb7993d78f | |
| parent | c622b29d1f38021411965b7e0170ab055551b257 (diff) | |
| download | linux-28570e8dac5c86ab10ce2a7e9c02d3aaece63760.tar.xz | |
xtensa: add trap_set_handler function
trap_set_handler sets new C-handler in the exception table and returns
previous handler.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
| -rw-r--r-- | arch/xtensa/include/asm/traps.h | 23 | ||||
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 11 |
2 files changed, 34 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/traps.h b/arch/xtensa/include/asm/traps.h new file mode 100644 index 0000000..54f7044 --- /dev/null +++ b/arch/xtensa/include/asm/traps.h @@ -0,0 +1,23 @@ +/* + * 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 */ diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 5caf2b6..691a792 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -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. * |