[PATCH v2 10/18] arm64: entry: Add exception trampoline page for exceptions from EL0

On Thu, Nov 30, 2017 at 04:39:38PM +0000, Will Deacon wrote:

+	.macro tramp_ventry, regsize = 64
+	.align	7
+1:
+	.if	\regsize == 64
+	msr	tpidrro_el0, x30
+	.endif
+	tramp_map_kernel	x30
+	ldr	x30, =vectors
+	prfm	plil1strm, [x30, #(1b - tramp_vectors)]
+	msr	vbar_el1, x30
+	add	x30, x30, #(1b - tramp_vectors)
+	isb
+	br	x30
+	.endm

It might be worth a comment that the real vectors will restore x30 from
tpiddro_el0, since as-is, it looks like we're corrupting the value.

Otherwise, this looks good to me.

Thanks,
Mark.