From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Peter Zijlstra <peterz@infradead.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andy Lutomirski <luto@amacapital.net>,
Dave Watson <davejwatson@fb.com>, Paul Turner <pjt@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <linux@arm.linux.org.uk>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi@firstfloor.org>, Chris Lameter <cl@linux.com>,
Ben Maurer <bmaurer@fb.com>, Steven Rostedt <rostedt@goodmis.org>,
Josh Triplett <josh@joshtriplett.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Joel Fernandes <joelaf@google.com>, Shuah Khan <shuah@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Alan Modra <amodra@gmail.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH for 5.2 09/10] rseq/selftests: powerpc code signature: generate valid instructions
Date: Wed, 24 Apr 2019 11:25:01 -0400 [thread overview]
Message-ID: <20190424152502.14246-10-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20190424152502.14246-1-mathieu.desnoyers@efficios.com>
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
---
tools/testing/selftests/rseq/rseq-ppc.h | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/rseq/rseq-ppc.h b/tools/testing/selftests/rseq/rseq-ppc.h
index 9df18487fa9f..76be90196fe4 100644
--- a/tools/testing/selftests/rseq/rseq-ppc.h
+++ b/tools/testing/selftests/rseq/rseq-ppc.h
@@ -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")
--
2.11.0
next prev parent reply other threads:[~2019-04-24 15:26 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-24 15:24 [RFC PATCH for 5.2 00/10] Restartable Sequences selftests updates Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 01/10] rseq/selftests: Add __rseq_exit_point_array section for debuggers Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 02/10] rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to __rseq_cs Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 03/10] rseq/selftests: Use __rseq_handled symbol to coexist with glibc Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 04/10] rseq/selftests: s390: use jg instruction for jumps outside of the asm Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 05/10] rseq/selftests: x86: use ud1 instruction as RSEQ_SIG opcode Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 06/10] rseq/selftests: s390: use trap4 for RSEQ_SIG Mathieu Desnoyers
2019-04-24 15:24 ` [RFC PATCH for 5.2 07/10] rseq/selftests: arm: use udf instruction " Mathieu Desnoyers
2019-04-24 15:25 ` [RFC PATCH for 5.2 08/10] rseq/selftests: aarch64 code signature: handle big-endian environment Mathieu Desnoyers
2019-04-24 16:40 ` Mark Rutland
2019-04-24 16:44 ` Will Deacon
2019-04-24 16:45 ` Mark Rutland
2019-04-24 16:45 ` Will Deacon
2019-04-24 16:51 ` Mark Rutland
2019-04-24 17:00 ` Mathieu Desnoyers
2019-04-24 17:02 ` Mathieu Desnoyers
2019-04-24 15:25 ` Mathieu Desnoyers [this message]
2019-04-24 15:25 ` [RFC PATCH for 5.2 10/10] rseq/selftests: mips: use break instruction for RSEQ_SIG Mathieu Desnoyers
2019-04-24 22:06 ` Paul Burton
2019-04-24 23:12 ` Mathieu Desnoyers
2019-04-24 23:17 ` Paul Burton
2019-04-24 23:22 ` Mathieu Desnoyers
2019-04-25 14:21 ` Mathieu Desnoyers
2019-04-29 22:31 ` Paul Burton
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