linux-stable.git/arch/arm/lib/backtrace.S, branch linux-4.3.y Linux kernel stable tree ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18T11:29:04+00:00 Russell King rmk+kernel@arm.linux.org.uk 2014-06-30T15:29:12+00:00 6ebbf2ce437b33022d30badd49dc94d33ecfa498 ARMv6 and greater introduced a new instruction ("bx") which can be used to return from function calls. Recent CPUs perform better when the "bx lr" instruction is used rather than the "mov pc, lr" instruction, and this sequence is strongly recommended to be used by the ARM architecture manual (section A.4.1.1). We provide a new macro "ret" with all its variants for the condition code which will resolve to the appropriate instruction. Rather than doing this piecemeal, and miss some instances, change all the "mov pc" instances to use the new macro, with the exception of the "movs" instruction and the kprobes code. This allows us to detect the "mov pc, lr" case and fix it up - and also gives us the possibility of deploying this for other registers depending on the CPU selection. Reported-by: Will Deacon <will.deacon@arm.com> Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1 Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood Tested-by: Shawn Guo <shawn.guo@freescale.com> Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385 Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
ARMv6 and greater introduced a new instruction ("bx") which can be used
to return from function calls.  Recent CPUs perform better when the
"bx lr" instruction is used rather than the "mov pc, lr" instruction,
and this sequence is strongly recommended to be used by the ARM
architecture manual (section A.4.1.1).

We provide a new macro "ret" with all its variants for the condition
code which will resolve to the appropriate instruction.

Rather than doing this piecemeal, and miss some instances, change all
the "mov pc" instances to use the new macro, with the exception of
the "movs" instruction and the kprobes code.  This allows us to detect
the "mov pc, lr" case and fix it up - and also gives us the possibility
of deploying this for other registers depending on the CPU selection.

Reported-by: Will Deacon <will.deacon@arm.com>
Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S
Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385
Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci
Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen
Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M
Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: make kernel oops easier to read 2013-12-29T12:32:30+00:00 Russell King rmk+kernel@arm.linux.org.uk 2013-10-20T14:34:10+00:00 ef41b5c924984b34d9c2830185295b2a9ae78e13 We don't need the offset for the first function name in each backtrace entry; this needlessly consumes screen space. This is virtually always the first or second instruction in the called function. Also, recognise stmfd instructions which include r10 as a valid stack saving instruction, and when dumping the registers, dump six registers per line rather than five, and fix the wrapping. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
We don't need the offset for the first function name in each backtrace
entry; this needlessly consumes screen space.  This is virtually always
the first or second instruction in the called function.

Also, recognise stmfd instructions which include r10 as a valid stack
saving instruction, and when dumping the registers, dump six registers
per line rather than five, and fix the wrapping.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 7068/1: process: change from __backtrace to dump_stack in show_regs 2011-10-17T08:12:41+00:00 Laura Abbott lauraa@codeaurora.org 2011-08-31T01:04:06+00:00 b380ab4f85d641574d91b12b333848a0731a497c Currently, show_regs calls __backtrace which does nothing if CONFIG_FRAME_POINTER is not set. Switch to dump_stack which handles both CONFIG_FRAME_POINTER and CONFIG_ARM_UNWIND correctly. __backtrace is now superseded by dump_stack in general and show_regs was the last caller so remove __backtrace as well. Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Currently, show_regs calls __backtrace which does
nothing if CONFIG_FRAME_POINTER is not set. Switch to
dump_stack which handles both CONFIG_FRAME_POINTER and
CONFIG_ARM_UNWIND correctly.

__backtrace is now superseded by dump_stack in general
and show_regs was the last caller so remove __backtrace
as well.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: fix build error in arch/arm/kernel/process.c 2010-04-21T07:45:21+00:00 Russell King rmk+kernel@arm.linux.org.uk 2010-04-19T09:15:03+00:00 4260415f6a3b92c5c986398d96c314df37a4ccbf /tmp/ccJ3ssZW.s: Assembler messages: /tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077' This is caused because: .section .data .section .text .section .text .previous does not return us to the .text section, but the .data section; this makes use of .previous dangerous if the ordering of previous sections is not known. Fix up the other users of .previous; .pushsection and .popsection are a safer pairing to use than .section and .previous. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
/tmp/ccJ3ssZW.s: Assembler messages:
/tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077'

This is caused because:

	.section .data
	.section .text
	.section .text
	.previous

does not return us to the .text section, but the .data section; this
makes use of .previous dangerous if the ordering of previous sections
is not known.

Fix up the other users of .previous; .pushsection and .popsection are
a safer pairing to use than .section and .previous.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24T11:32:57+00:00 Catalin Marinas catalin.marinas@arm.com 2009-07-24T11:32:57+00:00 8b592783a2e8b7721a99730bd549aab5208f36af This patch adds the ARM/Thumb-2 unified support for the arch/arm/lib/* files. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
This patch adds the ARM/Thumb-2 unified support for the arch/arm/lib/*
files.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01T11:06:34+00:00 Catalin Marinas catalin.marinas@arm.com 2008-08-28T10:22:32+00:00 93ed3970114983543bbebd195bef65db84444ea2 This declaration specifies the "function" type and size for various assembly functions, mainly needed for generating the correct branch instructions in Thumb-2. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
This declaration specifies the "function" type and size for various
assembly functions, mainly needed for generating the correct branch
instructions in Thumb-2.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] Add ability to dump exception stacks to kernel backtraces 2007-04-21T19:34:34+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2007-03-02T15:01:36+00:00 7ab3f8d595a1b1e5cf8d726b72fd476fe0d0226c Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Remove obsolete #include <linux/config.h> 2006-06-30T17:25:36+00:00 Jörn Engel joern@wohnheim.fh-wedel.de 2006-06-30T17:25:36+00:00 6ab3d5624e172c553004ecc862bfeac16d9d68b7 Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de> 
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
[ARM] nommu: backtrace code must not reference a discarded section 2006-06-28T16:59:57+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2006-06-21T19:43:55+00:00 583e7f5d36547f0d84caf71d43b71f0530a47766 The code in "1007:" is in the .fixup section, which in the mmuless case is discarded. Since this code is referenced from the .text section, it causes an link error. Move this code into the .text section instead. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
The code in "1007:" is in the .fixup section, which in the mmuless
case is discarded.  Since this code is referenced from the .text
section, it causes an link error.  Move this code into the .text
section instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] Remove LOADREGS macro 2006-06-25T10:23:45+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2006-06-25T10:23:45+00:00 1b93a71755f2b15450b3e3045dab58a633e37b18 As for RETINSTR, LOADREGS is a left-over from the 26-bit days. Remove it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
As for RETINSTR, LOADREGS is a left-over from the 26-bit days.
Remove it.

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