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FROMLIST: arm64: kernel: avoid x18 in __cpu_soft_restart

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The code in __cpu_soft_restart() uses x18 as an arbitrary temp register,
which will shortly be disallowed. So use x8 instead.

Bug: 145210207
Change-Id: Ifeb90566b4e41eb376fd4beaffd55fca8597aa2c
(am from https://lore.kernel.org/patchwork/patch/1149053/)
Link: https://patchwork.kernel.org/patch/9836877/
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
[Sami: updated commit message]
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Ard Biesheuvel
2018-04-03 10:44:32 -07:00
committed by Alistair Delva
parent d514aa4e70
commit 54e1b51f5b
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/cpu-reset.S
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@@ -45,11 +45,11 @@ ENTRY(__cpu_soft_restart)
mov x0, #HVC_SOFT_RESTART mov x0, #HVC_SOFT_RESTART
hvc #0 // no return hvc #0 // no return
1: mov x18, x1 // entry 1: mov x8, x1 // entry
mov x0, x2 // arg0 mov x0, x2 // arg0
mov x1, x3 // arg1 mov x1, x3 // arg1
mov x2, x4 // arg2 mov x2, x4 // arg2
br x18 br x8
ENDPROC(__cpu_soft_restart) ENDPROC(__cpu_soft_restart)
.popsection .popsection