ARM: 7987/1: ARM : unwinder : Prevent data abort due to stack overflow
authorAnurag Aggarwal <a.anurag@samsung.com>
Mon, 24 Feb 2014 10:17:36 +0000 (11:17 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Tue, 25 Feb 2014 11:48:24 +0000 (11:48 +0000)
commita51345770e519552e749ff457a2a9f83171a67b5
tree94b29eee74c40959705274948ad87c90de4797e4
parent8258a9895c99cdaacad8edc4748c0a624c710961
ARM: 7987/1: ARM : unwinder : Prevent data abort due to stack overflow

While unwinding backtrace, stack overflow is possible. This stack
overflow can sometimes lead to data abort in system if the area after
stack is not mapped to physical memory.

To prevent this problem from happening, execute the instructions that
can cause a data abort in separate helper functions, where a check for
feasibility is made before reading each word from the stack.

Signed-off-by: Anurag Aggarwal <a.anurag@samsung.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/kernel/unwind.c