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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>
This commit is contained in:
Mathieu Desnoyers 2019-04-29 11:28:01 -04:00 committed by Shuah Khan
parent 7cd4ce2e46
commit 496fd0fc9f
1 changed files with 9 additions and 1 deletions
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10
tools/testing/selftests/rseq/rseq-ppc.h
View File

@ -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")