linux-stable.git/arch/arm/kernel/entry-header.S, branch v3.16 Linux kernel stable tree Merge branches 'alignment', 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-06-05T11:35:52+00:00 Russell King rmk+kernel@arm.linux.org.uk 2014-06-05T11:35:52+00:00 1fb333489fb917c704ad43e51b45c12f52215a9c 






ARM: consolidate last remaining open-coded alignment trap enable
2014-06-02T08:20:20+00:00

Russell King
rmk+kernel@arm.linux.org.uk

2014-04-13T19:24:51+00:00

8229c54fa1747765dae1a77875b04e4d69f6ab62

We can use the alignment_trap assembly macro here too.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>





We can use the alignment_trap assembly macro here too.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>







ARM: 8064/1: fix v7-M signal return
2014-05-25T22:44:27+00:00

Rabin Vincent
rabin@rab.in

2014-05-24T16:38:01+00:00

483a6c9d447f625b991fa04a1530493d893984db

According to the ARM ARM, the behaviour is UNPREDICTABLE if the PC read
from the exception return stack is not half word aligned.  See the
pseudo code for ExceptionReturn() and PopStack().

The signal handler's address has the bit 0 set, and setup_return()
directly writes this to regs->ARM_pc.  Current hardware happens to
discard this bit, but QEMU's emulation doesn't and this makes processes
crash.  Mask out bit 0 before the exception return in order to get
predictable behaviour.

Fixes: 19c4d593f0b4 ("ARM: ARMv7-M: Add support for exception handling")

Cc: stable@kernel.org
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>





According to the ARM ARM, the behaviour is UNPREDICTABLE if the PC read
from the exception return stack is not half word aligned.  See the
pseudo code for ExceptionReturn() and PopStack().

The signal handler's address has the bit 0 set, and setup_return()
directly writes this to regs->ARM_pc.  Current hardware happens to
discard this bit, but QEMU's emulation doesn't and this makes processes
crash.  Mask out bit 0 before the exception return in order to get
predictable behaviour.

Fixes: 19c4d593f0b4 ("ARM: ARMv7-M: Add support for exception handling")

Cc: stable@kernel.org
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>







ARM: 8017/1: Move asm macro get_thread_info to asm/assembler.h
2014-04-09T12:08:07+00:00

Catalin Marinas
catalin.marinas@arm.com

2014-04-02T09:57:48+00:00

39ad04ccd6e1b235601e9ac5a7f508d05728a97a

asm/assembler.h is a better place for this macro since it is used by
asm files outside arch/arm/kernel/

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Arun KS <getarunks@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>





asm/assembler.h is a better place for this macro since it is used by
asm files outside arch/arm/kernel/

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Arun KS <getarunks@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>







arm: Fix build error with context tracking calls
2013-09-27T15:59:47+00:00

Frederic Weisbecker
fweisbec@gmail.com

2013-09-09T22:54:17+00:00

0c06a5d4b13cd66c833805a0d1db76b977944aac

ad65782fba50 (context_tracking: Optimize main APIs off case
with static key) converted context tracking main APIs to inline
function and left ARM asm callers behind.

This can be easily fixed by making ARM calling the post static
keys context tracking function. We just need to replicate the
static key checks there. We'll remove these later when ARM will
support the context tracking static keys.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Kevin Hilman <khilman@linaro.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Anil Kumar <anilk4.v@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kevin Hilman <khilman@linaro.org>





ad65782fba50 (context_tracking: Optimize main APIs off case
with static key) converted context tracking main APIs to inline
function and left ARM asm callers behind.

This can be easily fixed by making ARM calling the post static
keys context tracking function. We just need to replicate the
static key checks there. We'll remove these later when ARM will
support the context tracking static keys.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Kevin Hilman <khilman@linaro.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Anil Kumar <anilk4.v@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kevin Hilman <khilman@linaro.org>







Merge branch 'for-next' of git://git.pengutronix.de/git/ukl/linux into devel-stable
2013-05-22T09:52:24+00:00

Russell King
rmk+kernel@arm.linux.org.uk

2013-05-19T00:22:53+00:00

f150abe1012f2fc7d444d33d651db32435038c11

Pull ARM-v7M support from Uwe Kleine-König:
"All but the last patch were in next since next-20130418 without issues.
The last patch fixes a problem in combination with

  8164f7a (ARM: 7680/1: Detect support for SDIV/UDIV from ISAR0 register)

which triggers a WARN_ON without an implemented read_cpuid_ext.

The branch merges fine into v3.10-rc1 and I'd be happy if you pulled it
for 3.11-rc1. The only missing piece to be able to run a Cortex-M3 is
the irqchip driver that will go in via Thomas Gleixner and platform
specific stuff."





Pull ARM-v7M support from Uwe Kleine-König:
"All but the last patch were in next since next-20130418 without issues.
The last patch fixes a problem in combination with

  8164f7a (ARM: 7680/1: Detect support for SDIV/UDIV from ISAR0 register)

which triggers a WARN_ON without an implemented read_cpuid_ext.

The branch merges fine into v3.10-rc1 and I'd be happy if you pulled it
for 3.11-rc1. The only missing piece to be able to run a Cortex-M3 is
the irqchip driver that will go in via Thomas Gleixner and platform
specific stuff."







Merge branches 'devel-stable', 'entry', 'fixes', 'mach-types', 'misc' and 'smp-hotplug' into for-linus
2013-05-02T20:30:36+00:00

Russell King
rmk+kernel@arm.linux.org.uk

2013-05-02T20:30:36+00:00

946342d03ec4e8367bba7bb99e7155e97f69058a












ARM: ARMv7-M: Add support for exception handling
2013-04-17T19:44:46+00:00

Uwe Kleine-König
u.kleine-koenig@pengutronix.de

2010-05-21T17:06:42+00:00

19c4d593f0b4bd46f6d923a3e514719982a22058

This patch implements the exception handling for the ARMv7-M
architecture (pretty different from the A or R profiles).

It bases on work done earlier by Catalin for 2.6.33 but was nearly
completely rewritten to use a pt_regs layout compatible to the A
profile.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Jonathan Austin <jonathan.austin@arm.com>
Tested-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>





This patch implements the exception handling for the ARMv7-M
architecture (pretty different from the A or R profiles).

It bases on work done earlier by Catalin for 2.6.33 but was nearly
completely rewritten to use a pt_regs layout compatible to the A
profile.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Jonathan Austin <jonathan.austin@arm.com>
Tested-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>







ARM: 7688/1: add support for context tracking subsystem
2013-04-03T16:00:01+00:00

Kevin Hilman
khilman@deeprootsystems.com

2013-03-28T21:54:40+00:00

b00884802043d9102ecc2abfdc37a7b35b30e52a

commit 91d1aa43 (context_tracking: New context tracking susbsystem)
generalized parts of the RCU userspace extended quiescent state into
the context tracking subsystem.  Context tracking is then used
to implement adaptive tickless (a.k.a extended nohz)

To support the new context tracking subsystem on ARM, the user/kernel
boundary transtions need to be instrumented.

For exceptions and IRQs in usermode, the existing usr_entry macro is
used to instrument the user->kernel transition.  For the return to
usermode path, the ret_to_user* path is instrumented.  Using the
usr_entry macro, this covers interrupts in userspace, data abort and
prefetch abort exceptions in userspace as well as undefined exceptions
in userspace (which is where FP emulation and VFP are handled.)

For syscalls, the slow return path is covered by instrumenting the
ret_to_user path.  In addition, the syscall entry point is
instrumented which covers the user->kernel transition for both fast
and slow syscalls, and an additional instrumentation point is added
for the fast syscall return path (ret_fast_syscall).

Cc: Mats Liljegren <mats.liljegren@enea.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>





commit 91d1aa43 (context_tracking: New context tracking susbsystem)
generalized parts of the RCU userspace extended quiescent state into
the context tracking subsystem.  Context tracking is then used
to implement adaptive tickless (a.k.a extended nohz)

To support the new context tracking subsystem on ARM, the user/kernel
boundary transtions need to be instrumented.

For exceptions and IRQs in usermode, the existing usr_entry macro is
used to instrument the user->kernel transition.  For the return to
usermode path, the ret_to_user* path is instrumented.  Using the
usr_entry macro, this covers interrupts in userspace, data abort and
prefetch abort exceptions in userspace as well as undefined exceptions
in userspace (which is where FP emulation and VFP are handled.)

For syscalls, the slow return path is covered by instrumenting the
ret_to_user path.  In addition, the syscall entry point is
instrumented which covers the user->kernel transition for both fast
and slow syscalls, and an additional instrumentation point is added
for the fast syscall return path (ret_fast_syscall).

Cc: Mats Liljegren <mats.liljegren@enea.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>







ARM: entry: move disable_irq_notrace into svc_exit
2013-04-03T15:50:23+00:00

Russell King
rmk+kernel@arm.linux.org.uk

2013-03-28T14:36:05+00:00

f8f02ec25ce3eafb049feeb3abf34fcd6e338241

All svc exit paths need IRQs off.  Rather than placing this before
every user of svc_exit, combine it into this macro.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>





All svc exit paths need IRQs off.  Rather than placing this before
every user of svc_exit, combine it into this macro.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>