linux-kernel - [PATCH v4 0/2] powerpc: Emulation support for load/store instructions on LE

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Date:   Tue, 14 Feb 2017 19:58:06 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        mpe@...erman.id.au
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        lsorense@...lub.uwaterloo.ca, oohall@...il.com,
        naveen.n.rao@...ux.vnet.ibm.com, ast@...nel.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        anton@...ba.org, paul.gortmaker@...driver.com,
        bauerman@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
        christophe.leroy@....fr, duwe@....de, oss@...error.net,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH v4 0/2] powerpc: Emulation support for load/store instructions on LE

emulate_step is the basic infrastructure which is used by number of other
kernel infrastructures like kprobe, hw-breakpoint(data breakpoint) etc.
In case of kprobe, enabling emulation of load/store instructions will
speedup the execution of probed instruction. In case of kernel-space
breakpoint, causative instruction is first get emulated before executing
user registered handler. If emulation fails, hw-breakpoint is disabled
with error. As emulate_step does not support load/store instructions on
LE, kernel-space hw-breakpoint infrastructure is broken on LE.

emulate_step() uses a number of underlying kernel functions that were
initially not enabled for LE. This has been rectified since. So, fix
emulate_step() for LE for the corresponding instructions.

Also add selftest which will run at boot if CONFIG_KPROBES_SANITY_TEST
and CONFIG_PPC64 is set.

Changes in v4:
  - Used late_initcall() for selftest
  - Makefile changes

v3 link: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1332686.html

Ravi Bangoria (2):
  powerpc: Emulation support for load/store instructions on LE
  powerpc: emulate_step tests for load/store instructions

 arch/powerpc/include/asm/ppc-opcode.h |   7 +
 arch/powerpc/lib/Makefile             |   2 +
 arch/powerpc/lib/sstep.c              |  20 --
 arch/powerpc/lib/test_emulate_step.c  | 443 ++++++++++++++++++++++++++++++++++
 4 files changed, 452 insertions(+), 20 deletions(-)
 create mode 100644 arch/powerpc/lib/test_emulate_step.c

-- 
1.8.3.1