Commit 153cd8e8 authored by Dave Martin's avatar Dave Martin Committed by Russell King
Browse files

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: default avatarDave Martin <dave.martin@linaro.org>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Acked-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ddffeb8c
......@@ -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
isb
mov pc, r0
bx r0
ENDPROC(cpu_v7_reset)
.popsection
......
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