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Subject[ 13/89] ARM: virt: Avoid bx instruction for compatibility with <=ARMv4
Date
3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Martin <dave.martin@linaro.org>

commit a4a12e008e292a81d312659529b71be2026ab355 upstream.

Non-T variants of ARMv4 do not support the bx instruction.

However, __hyp_stub_install is always called from the same
instruction set used to build the bulk of the kernel, so bx should
not be necessary.

This patch uses the traditional "mov pc" instead of bx.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
[will: fixed up remaining bx instruction]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arm/kernel/hyp-stub.S | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -99,7 +99,7 @@ ENTRY(__hyp_stub_install_secondary)
* immediately.
*/
compare_cpu_mode_with_primary r4, r5, r6, r7
- bxne lr
+ movne pc, lr

/*
* Once we have given up on one CPU, we do not try to install the
@@ -111,7 +111,7 @@ ENTRY(__hyp_stub_install_secondary)
*/

cmp r4, #HYP_MODE
- bxne lr @ give up if the CPU is not in HYP mode
+ movne pc, lr @ give up if the CPU is not in HYP mode

/*
* Configure HSCTLR to set correct exception endianness/instruction set
@@ -200,7 +200,7 @@ ENDPROC(__hyp_get_vectors)
@ fall through
ENTRY(__hyp_set_vectors)
__HVC(0)
- bx lr
+ mov pc, lr
ENDPROC(__hyp_set_vectors)

#ifndef ZIMAGE



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