ARM: HYP/non-sec: migrate stack
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>
diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S
index 56bdba1..1773fae 100644
--- a/arch/arm/cpu/armv7/nonsec_virt.S
+++ b/arch/arm/cpu/armv7/nonsec_virt.S
@@ -80,6 +80,8 @@
#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)