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Message-Id: <20170712144424.19528-6-ard.biesheuvel@linaro.org>
Date: Wed, 12 Jul 2017 15:44:18 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: linux-arm-kernel@...ts.infradead.org,
kernel-hardening@...ts.openwall.com
Cc: mark.rutland@....com,
labbott@...oraproject.org,
will.deacon@....com,
dave.martin@....com,
catalin.marinas@....com,
Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [RFC PATCH 05/10] arm64: kernel: avoid x18 as an arbitrary temp register
The code in __cpu_soft_restart() uses x18 as an arbitrary temp register,
which will shortly be disallowed. So use x8 instead.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
arch/arm64/kernel/cpu-reset.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S
index 65f42d257414..56e637e558c5 100644
--- a/arch/arm64/kernel/cpu-reset.S
+++ b/arch/arm64/kernel/cpu-reset.S
@@ -44,11 +44,11 @@ ENTRY(__cpu_soft_restart)
mov x0, #HVC_SOFT_RESTART
hvc #0 // no return
-1: mov x18, x1 // entry
+1: mov x8, x1 // entry
mov x0, x2 // arg0
mov x1, x3 // arg1
mov x2, x4 // arg2
- br x18
+ br x8
ENDPROC(__cpu_soft_restart)
.popsection
--
2.9.3
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