tree a5f098d679e5054bc49edfdc703372212df9d595
parent e51162f4d5928277dc3a429f0e319f85bc97752e
author Anurag Aggarwal <a.anurag@samsung.com> 1393237056 +0100
committer Daniel Mentz <danielmentz@google.com> 1423608032 -0800

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.

Change-Id: I0cc732063c87ab15f08ddbad0231a19d890898ec
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>