tree c6bce9558522694ec5fd28582b53d6b80b026fad
parent c5e70965e2b0e89dbd619885819979beb9510730
author Nikolay Borisov <Nikolay.Borisov@arm.com> 1399560866 +0100
committer Daniel Mentz <danielmentz@google.com> 1423608033 -0800

ARM: 8052/1: unwind: Fix handling of "Pop r4-r[4+nnn],r14" opcode

The arm EABI states that unwind opcode 10100nnn means pop register r4-4[4+nnn],aditionally there is a similar unwind opcode: 10101nnn which means the same thing plus popping r14. Those two cases are handled by the unwind_exec_pop_r4_to_rN function which checks whether the 4th bit is set and does r14 popping.

However, up until now it has been checking whether the 8th bit was set (mask & 0x80) instead of the 4th (mask & 0x8), a simple to make typo but this meant that we were always popping r14 even if we had the former opcode.

This patch changes the mask so that the 2 unwind opcodes are being handled correctly.

Change-Id: I9018a63d62c5b163a8aa49187cdf1a67804658b6
Signed-off-by: Nikolay Borisov <Nikolay.Borisov@arm.com>
Reviewed-by: Anurag Aggarwal <anurag19aggarwal@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>