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Use the saved program state register to detect when an exception frame is

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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
This commit is contained in:
Andrew Turner 2016-03-22 08:36:25 +00:00
parent da611c05f0
commit f6c7371c81
1 changed files with 2 additions and 2 deletions
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4
sys/arm64/include/cpu.h
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@ -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 <machine/armreg.h>
#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))