From: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
mpe@ellerman.id.au
Cc: benh@kernel.crashing.org, paulus@samba.org,
lsorense@csclub.uwaterloo.ca, oohall@gmail.com,
naveen.n.rao@linux.vnet.ibm.com, ast@kernel.org,
chris@distroguy.com, aneesh.kumar@linux.vnet.ibm.com,
bsingharora@gmail.com, anton@samba.org,
paul.gortmaker@windriver.com, bauerman@linux.vnet.ibm.com,
viro@zeniv.linux.org.uk, christophe.leroy@c-s.fr, duwe@lst.de,
oss@buserror.net,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: [PATCH 0/3] powerpc: Emulation support for load/store instructions on LE
Date: Wed, 2 Nov 2016 14:23:00 +0530 [thread overview]
Message-ID: <1478076783-2872-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com> (raw)
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 w.r.t. RFC:
- Enable emulation support for all types of (Normal, Floating Point,
Vector and Vector Scalar) load/store instructions.
- Introduce selftest to test emulate_step for load/store instructions.
Ravi Bangoria (3):
powerpc: Emulation support for load/store instructions on LE
powerpc: Add encoding for couple of load/store instructions
powerpc: emulate_step test 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
next reply other threads:[~2016-11-02 8:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-02 8:53 Ravi Bangoria [this message]
2016-11-02 8:53 ` [PATCH 1/3] powerpc: Emulation support for load/store instructions on LE Ravi Bangoria
2016-11-02 21:04 ` Anton Blanchard
2016-11-03 5:41 ` Ravi Bangoria
2016-11-03 9:48 ` Michael Ellerman
2016-11-03 10:27 ` Ravi Bangoria
2016-11-04 2:07 ` Andrew Donnellan
2016-11-04 5:31 ` Ravi Bangoria
2016-11-05 19:31 ` Anton Blanchard
2016-11-06 18:59 ` Ravi Bangoria
2016-11-02 8:53 ` [PATCH 2/3] powerpc: Add encoding for couple of load/store instructions Ravi Bangoria
2016-11-02 8:53 ` [PATCH 3/3] powerpc: emulate_step test for " Ravi Bangoria
2016-11-02 10:30 ` Naveen N. Rao
2016-11-03 7:03 ` [PATCH 0/3] powerpc: Emulation support for load/store instructions on LE Naveen N. Rao
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