linux-kernel - [PATCH v2 0/2] powerpc: Emulation support for load/store instructions on LE

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Date:   Tue, 14 Feb 2017 13:32:10 +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,
        chris@...troguy.com, 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 v2 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 v2:
  - Folded 2nd and 3rd patch of v1 into one patch, as suggested by Naveen

v1 link: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg110671.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/include/asm/sstep.h      |   8 +
 arch/powerpc/kernel/kprobes.c         |   2 +
 arch/powerpc/lib/Makefile             |   4 +
 arch/powerpc/lib/sstep.c              |  20 --
 arch/powerpc/lib/test_emulate_step.c  | 439 ++++++++++++++++++++++++++++++++++
 6 files changed, 460 insertions(+), 20 deletions(-)
 create mode 100644 arch/powerpc/lib/test_emulate_step.c

-- 
1.8.3.1