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Filename Latest commit message Latest commit date
Matt Redfearn 11887ed172 MIPS: Handle non word sized instructions when examining frame 
Commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
added fairly broken support for handling 16bit microMIPS instructions in
get_frame_info(). It adjusts the instruction pointer by 16bits in the
case of a 16bit sp move instruction, but not any other 16bit
instruction.

Commit b6c7a324df ("MIPS: Fix get_frame_info() handling of microMIPS
function size") goes some way to fixing get_frame_info() to iterate over
microMIPS instuctions, but the instruction pointer is still manipulated
using a postincrement, and is of union mips_instruction type. Since the
union is sized to the largest member (a word), but microMIPS
instructions are a mix of halfword and word sizes, the function does not
always iterate correctly, ending up misaligned with the instruction
stream and interpreting it incorrectly.

Since the instruction modifying the stack pointer is usually the first
in the function, that one is usually handled correctly. But the
instruction which saves the return address to the sp is some variable
number of instructions into the frame and is frequently missed due to
not being on a word boundary, leading to incomplete walking of the
stack.

Fix this by incrementing the instruction pointer based on the size of
the previously decoded instruction (& remove the hack introduced by
commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
which adjusts the instruction pointer in the case of a 16bit sp move
instruction, but not any other).

Fixes: 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16953/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-09-06 13:17:52 +02:00
arch MIPS: Handle non word sized instructions when examining frame 2017-09-06 13:17:52 +02:00
block
certs
crypto
Documentation phy: Add an USB PHY driver for the Lantiq SoCs using the RCU module 2017-09-04 21:19:02 +02:00
drivers watchdog: octeon-wdt: Add support for 78XX SOCs. 2017-09-04 21:19:03 +02:00
firmware
fs Merge branch 'akpm' (patches from Andrew) 2017-08-25 18:02:27 -07:00
include MIPS: lantiq: Add a GPHY driver which uses the RCU syscon-mfd 2017-09-04 21:19:02 +02:00
init
ipc
kernel Minor page waitqueue cleanups 2017-08-27 13:55:12 -07:00
lib
mm Avoid page waitqueue race leaving possible page locker waiting 2017-08-27 16:25:09 -07:00
net
samples
scripts
security
sound
tools NTB bug fixes to address an incorrect ntb_mw_count reference in the NTB 2017-08-27 17:01:54 -07:00
usr
virt
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MIPS: lantiq: Convert the fpi bus driver to a platform_driver 2017-09-04 21:19:02 +02:00
Makefile Linux 4.13-rc7 2017-08-27 17:20:40 -07:00
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.