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ARM: HYP/non-sec: migrate stack

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The current code that switches into HYP mode doesn't bother to set
up a stack for HYP mode.  This doesn't work for EFI applications
as they expect a usable stack.  Fix this by migrating the stack
pointer from SP_svc to SP_hyp while in Monitor mode.
This restores the stack pointer when we drop into HYP mode.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Mark Kettenis 2018-06-15 23:47:11 +02:00 committed by Alexander Graf
parent f260bd30e8
commit 907ee2945e
1 changed files with 2 additions and 0 deletions
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arch/arm/cpu/armv7/nonsec_virt.S
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@ -80,6 +80,8 @@ _secure_monitor:
#ifdef CONFIG_ARMV7_VIRT
orreq r5, r5, #0x100 @ allow HVC instruction
moveq r6, #HYP_MODE @ Enter the kernel as HYP
mrseq r3, sp_svc
msreq sp_hyp, r3 @ migrate SP
#endif
mcr p15, 0, r5, c1, c1, 0 @ write SCR (with NS bit set)