linux-kernel - [RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections

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Date:   Thu, 14 Mar 2019 15:03:44 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ben Maurer <bmaurer@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections

Hi,

Those RFC patches improves the rseq selftests to properly expose data
sections helping debuggers to step over rseq critical sections.

* Add a new __rseq_exit_point_array section describing all rseq critical
  section exit points so debuggers can properly step over those. This is
  based on discussions with gdb and DynamoRIO developers.

* The __rseq_table section contains structures that are aligned on 32
  bytes, and in some cases the entries may not be aligned with the
  beginning of the section. Rename this section to __rseq_cs, and create
  a new __rseq_cs_ptr_array section containing packed 64-bit pointers to
  those __rseq_cs entries.

Thanks,

Mathieu


Mathieu Desnoyers (2):
  rseq/selftests: Add __rseq_exit_point_array section for debuggers
  rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to
    __rseq_cs

 tools/testing/selftests/rseq/rseq-arm.h   |  80 +++++++++++++++++++----
 tools/testing/selftests/rseq/rseq-arm64.h |  57 +++++++++++++++-
 tools/testing/selftests/rseq/rseq-mips.h  |  81 +++++++++++++++++++----
 tools/testing/selftests/rseq/rseq-ppc.h   |  80 +++++++++++++++++++++--
 tools/testing/selftests/rseq/rseq-s390.h  |  65 +++++++++++++++++-
 tools/testing/selftests/rseq/rseq-x86.h   | 105 +++++++++++++++++++++++++++++-
 6 files changed, 435 insertions(+), 33 deletions(-)

-- 
2.11.0