From 907ee2945e78c66aaefabaabada4d092fd8e3d58 Mon Sep 17 00:00:00 2001 From: Mark Kettenis Date: Fri, 15 Jun 2018 23:47:11 +0200 Subject: [PATCH] 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 Signed-off-by: Alexander Graf --- arch/arm/cpu/armv7/nonsec_virt.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S index 56bdba1d38..1773fae205 100644 --- a/arch/arm/cpu/armv7/nonsec_virt.S +++ b/arch/arm/cpu/armv7/nonsec_virt.S @@ -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)