From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Shuah Khan <shuah@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
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>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [PATCH for 5.2 07/12] rseq/selftests: s390: use trap4 for RSEQ_SIG
Date: Mon, 29 Apr 2019 11:27:58 -0400 [thread overview]
Message-ID: <20190429152803.7719-8-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20190429152803.7719-1-mathieu.desnoyers@efficios.com>
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Use trap4 as the guard instruction for the restartable sequence abort
handler.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
tools/testing/selftests/rseq/rseq-s390.h | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/rseq/rseq-s390.h b/tools/testing/selftests/rseq/rseq-s390.h
index 7c4f3a70b6c7..1d05c5187ae6 100644
--- a/tools/testing/selftests/rseq/rseq-s390.h
+++ b/tools/testing/selftests/rseq/rseq-s390.h
@@ -1,6 +1,13 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
-#define RSEQ_SIG 0x53053053
+/*
+ * RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the
+ * access-register mode nor the linkage stack this instruction will always
+ * cause a special-operation exception (the trap-enabled bit in the DUCT
+ * is and will stay 0). The instruction pattern is
+ * b2 ff 0f ff trap4 4095(%r0)
+ */
+#define RSEQ_SIG 0xB2FF0FFF
#define rseq_smp_mb() __asm__ __volatile__ ("bcr 15,0" ::: "memory")
#define rseq_smp_rmb() rseq_smp_mb()
--
2.11.0
next prev parent reply other threads:[~2019-04-29 15:30 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-29 15:27 [PATCH for 5.2 00/12] Restartable Sequences selftests updates Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 01/12] rseq/selftests: x86: Work-around bogus gcc-8 optimisation Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 02/12] rseq/selftests: Add __rseq_exit_point_array section for debuggers Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 03/12] rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to __rseq_cs Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 04/12] rseq/selftests: Use __rseq_handled symbol to coexist with glibc Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 05/12] rseq/selftests: s390: use jg instruction for jumps outside of the asm Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 06/12] rseq/selftests: x86: use ud1 instruction as RSEQ_SIG opcode Mathieu Desnoyers
2019-04-29 15:27 ` Mathieu Desnoyers [this message]
2019-05-16 20:39 ` [PATCH for 5.2 07/12] rseq/selftests: s390: use trap4 for RSEQ_SIG shuah
2019-05-16 20:49 ` Mathieu Desnoyers
2019-04-29 15:27 ` [PATCH for 5.2 08/12] rseq/selftests: arm: use udf instruction " Mathieu Desnoyers
2019-05-03 19:38 ` [PATCH v2 " Mathieu Desnoyers
2019-06-06 18:02 ` Mathieu Desnoyers
2019-06-08 15:52 ` Mathieu Desnoyers
2019-04-29 15:28 ` [PATCH for 5.2 09/12] rseq/selftests: aarch64 code signature: handle big-endian environment Mathieu Desnoyers
2019-04-29 15:28 ` [PATCH for 5.2 10/12] rseq/selftests: powerpc code signature: generate valid instructions Mathieu Desnoyers
2019-04-29 15:28 ` [PATCH for 5.2 11/12] rseq/selftests: mips: use break instruction for RSEQ_SIG Mathieu Desnoyers
2019-04-29 15:28 ` [PATCH for 5.2 12/12] rseq/selftests: add -no-integrated-as for clang Mathieu Desnoyers
2019-04-29 17:03 ` Nick Desaulniers
2019-04-29 20:28 ` Mathieu Desnoyers
2019-04-29 20:30 ` Nick Desaulniers
2019-05-03 18:36 ` [PATCH for 5.2 00/12] Restartable Sequences selftests updates Mathieu Desnoyers
2019-05-03 18:53 ` shuah
2019-05-03 19:22 ` Mathieu Desnoyers
2019-05-03 21:46 ` Joe Perches
2019-05-03 22:59 ` shuah
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