Commit 496fd0fc authored Apr 29, 2019 by Mathieu Desnoyers Committed by Shuah Khan May 07, 2019

rseq/selftests: powerpc code signature: generate valid instructions



Use "twui" as the guard instruction for the restartable sequence abort
handler.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
CC: Michael Ellerman <mpe@ellerman.id.au>
CC: Boqun Feng <boqun.feng@gmail.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
CC: Alan Modra <amodra@gmail.com>
CC: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

parent 7cd4ce2e

tools/testing/selftests/rseq/rseq-ppc.h

+9 −1

Original line number	Diff line number	Diff line
		@@ -6,7 +6,15 @@
		* (C) Copyright 2016-2018 - Boqun Feng <boqun.feng@gmail.com>
		*/

		#define RSEQ_SIG 0x53053053
		/*
		* RSEQ_SIG is used with the following trap instruction:
		*
		* powerpc-be: 0f e5 00 0b twui r5,11
		* powerpc64-le: 0b 00 e5 0f twui r5,11
		* powerpc64-be: 0f e5 00 0b twui r5,11
		*/

		#define RSEQ_SIG 0x0fe5000b

		#define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory", "cc")
		#define rseq_smp_lwsync() __asm__ __volatile__ ("lwsync" ::: "memory", "cc")

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