From 28570e8dac5c86ab10ce2a7e9c02d3aaece63760 Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Mon, 19 Nov 2012 08:30:15 +0400 Subject: 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 Signed-off-by: Chris Zankel --- arch/xtensa/kernel/traps.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'arch/xtensa/kernel') diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 5caf2b64d43a..691a792b01d3 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. * -- cgit v1.2.3