path: root/arch/arm/mm
diff options
authorDave Martin <dave.martin@linaro.org>2012-10-16 11:54:00 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-10-18 11:03:34 +0100
commit153cd8e839b5729358d4e5c3371e7509ee5ac96a (patch)
tree627a7dae9d293350f7147b111e657929d75926bd /arch/arm/mm
parentddffeb8c4d0331609ef2581d84de4d763607bd37 (diff)
ARM: 7553/1: proc-v7: Ensure correct instruction set after cpu_reset
Because mov pc,<Rn> never switches instruction set when executed in Thumb code, Thumb-2 kernels will silently execute the target code after cpu_reset as Thumb code, even if the passed code pointer denotes ARM (bit 0 clear). This patch uses bx instead, ensuring the correct instruction set for the target code. Thumb code in the kernel is not supported prior to ARMv7, so other CPUs are not affected. Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 846d279f317..42cc833aa02 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -57,7 +57,7 @@ ENTRY(cpu_v7_reset)
THUMB( bic r1, r1, #1 << 30 ) @ SCTLR.TE (Thumb exceptions)
mcr p15, 0, r1, c1, c0, 0 @ disable MMU
- mov pc, r0
+ bx r0