[PATCH 3.12 104/170] arm64: Bug fix in stack alignment exception

Jiri Slaby
2014-07-18T13:16:51Z

From: ChiaHao <andy.jhshiu@gmail.com>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit 3906c2b53cd23c2ae03e6ce41432c8e7f0a3cbbb upstream.

The value of ESR has been stored into x1, and should be directly pass to
do_sp_pc_abort function, "MOV x1, x25" is an extra operation and do_sp_pc_abort
will get the wrong value of ESR.

Signed-off-by: ChiaHao <andy.jhshiu@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/arm64/kernel/entry.S | 1 -
1 file changed, 1 deletion(-)

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 3881fd115ebb..028a1b91e2b3 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -275,7 +275,6 @@ el1_sp_pc:
* Stack or PC alignment exception handling
*/
mrs x0, far_el1
- mov x1, x25
mov x2, sp
b do_sp_pc_abort
el1_undef:
--
2.0.0