From acaab8fb107cfe1d09dafbf09733594df2459be1 Mon Sep 17 00:00:00 2001 From: andrew Date: Tue, 22 Mar 2016 08:36:25 +0000 Subject: Use the saved program state register to detect when an exception frame is from userpsace. Previously we could have triggered a panic by trying to jump to a kernel address from userland as the trap handling code thought we received an ast in kernel mode. Obtained from: ABT Systems Ltd Sponsored by: The FreeBSD Foundation --- sys/arm64/include/cpu.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'sys/arm64') diff --git a/sys/arm64/include/cpu.h b/sys/arm64/include/cpu.h index 8f14e82..520729c 100644 --- a/sys/arm64/include/cpu.h +++ b/sys/arm64/include/cpu.h @@ -1,6 +1,6 @@ /*- * Copyright (c) 1990 The Regents of the University of California. - * Copyright (c) 2014 The FreeBSD Foundation + * Copyright (c) 2014-2016 The FreeBSD Foundation * All rights reserved. * * This code is derived from software contributed to Berkeley by @@ -46,7 +46,7 @@ #include #define TRAPF_PC(tfp) ((tfp)->tf_lr) -#define TRAPF_USERMODE(tfp) (((tfp)->tf_elr & (1ul << 63)) == 0) +#define TRAPF_USERMODE(tfp) (((tfp)->tf_spsr & PSR_M_MASK) == PSR_M_EL0t) #define cpu_getstack(td) ((td)->td_frame->tf_sp) #define cpu_setstack(td, sp) ((td)->td_frame->tf_sp = (sp)) -- cgit v1.1