]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
ARM: 7180/1: Change kprobes testcase with unpredictable STRD instruction
authorJon Medhurst (Tixy) <tixy@yxit.co.uk>
Tue, 29 Nov 2011 07:14:35 +0000 (08:14 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Wed, 30 Nov 2011 23:54:53 +0000 (23:54 +0000)
commit14383c295ab48178c449336f5d74e9e615e36723
treed18981956db104fc75fc4212976e6363a094ecc3
parentfe41db7b3aca512e19b8ef4fbd5ad55545005d25
ARM: 7180/1: Change kprobes testcase with unpredictable STRD instruction

There is a kprobes testcase for the instruction "strd r2, [r3], r4".
This has unpredictable behaviour as it uses r3 for register writeback
addressing and also stores it to memory.

On a cortex A9, this testcase would fail because the instruction writes
the updated value of r3 to memory, whereas the kprobes emulation code
writes the original value.

Fix this by changing testcase to used r5 instead of r3.

Reported-by: Leif Lindholm <leif.lindholm@arm.com>
Tested-by: Leif Lindholm <leif.lindholm@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/kernel/kprobes-test-arm.c