From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 05/10] arm64: kernel: avoid x18 as an arbitrary temp register
Date: Wed, 12 Jul 2017 15:44:18 +0100 [thread overview]
Message-ID: <20170712144424.19528-6-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20170712144424.19528-1-ard.biesheuvel@linaro.org>
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@linaro.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
next prev parent reply other threads:[~2017-07-12 14:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-12 14:44 [RFC PATCH 00/10] arm64: allow virtually mapped stacks to be enabled Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 01/10] arm64/lib: copy_page: use consistent prefetch stride Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 02/10] arm64/lib: copy_page: avoid x18 register in assembler code Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 03/10] arm64: crypto: avoid register x18 in scalar AES code Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 04/10] arm64: kvm: stop treating register x18 as caller save Ard Biesheuvel
2017-07-12 14:44 ` Ard Biesheuvel [this message]
2017-07-12 14:44 ` [RFC PATCH 06/10] arm64: kbuild: reserve reg x18 from general allocation by the compiler Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 07/10] arm64: kernel: switch to register x18 as a task struct pointer Ard Biesheuvel
2017-07-13 10:41 ` Dave Martin
2017-07-13 12:27 ` Ard Biesheuvel
2017-07-13 14:11 ` Dave Martin
2017-07-12 14:44 ` [RFC PATCH 08/10] arm64/kernel: dump entire stack if sp points elsewhere Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 09/10] arm64: mm: add C level handling for stack overflows Ard Biesheuvel
2017-07-12 14:44 ` [RFC PATCH 10/10] arm64: kernel: add support for virtually mapped stacks Ard Biesheuvel
2017-07-12 22:59 ` Mark Rutland
2017-07-13 9:12 ` [kernel-hardening] " Mark Rutland
2017-07-13 10:35 ` Dave Martin
2017-07-12 20:12 ` [RFC PATCH 00/10] arm64: allow virtually mapped stacks to be enabled Laura Abbott
2017-07-12 20:49 ` Ard Biesheuvel
2017-07-12 21:32 ` Andy Lutomirski
2017-07-12 22:47 ` Mark Rutland
2017-07-13 6:51 ` Ard Biesheuvel
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