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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2010-03-04 15:33:16 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-03-07 10:22:00 +0000
commit51d47999b9452a8dc7ae58a11423c5db28f21ae1 (patch)
tree484851de79079901b8667e9dfbaa389c51a8e73a /arch/arm/kernel/unwind.c
parent1d40ddd10dab332456e3863fed2a6e71aa6635ab (diff)
ARM: 5977/1: arm: Enable backtrace printing on oops when PC is corrupted
If PC points outside kernel text, start printing the backtrace at LR instead. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/unwind.c')
-rw-r--r--arch/arm/kernel/unwind.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 786ac2b6914a..50292cd9c120 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -359,7 +359,9 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
frame.fp = regs->ARM_fp;
frame.sp = regs->ARM_sp;
frame.lr = regs->ARM_lr;
- frame.pc = regs->ARM_pc;
+ /* PC might be corrupted, use LR in that case. */
+ frame.pc = kernel_text_address(regs->ARM_pc)
+ ? regs->ARM_pc : regs->ARM_lr;
} else if (tsk == current) {
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;