linux.git/arch/arm/lib/backtrace.S, branch v5.6

ARM: 8897/1: check stmfd instruction using right shift

2019-08-23T10:32:37+00:00

In the commit ef41b5c92498 ("ARM: make kernel oops easier to read"),
-               .word   0xe92d0000 >> 10        @ stmfd sp!, {}
+               .word   0xe92d0000 >> 11        @ stmfd sp!, {}
then the shift need to change to 11.

Signed-off-by: Lvqiang Huang 
Signed-off-by: Chunyan Zhang 
Signed-off-by: Russell King

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55+00:00

Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Kate Stewart 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman

ARM: fix backtrace

2016-11-15T15:25:39+00:00

Recent kernels have changed their behaviour to be more inconsistent
when handling printk continuations.  With todays kernels, the output
looks sane on the console, but dmesg splits individual printk()s which
do not have the KERN_CONT prefix into separate lines.

Since the assembly code is not trivial to add the KERN_CONT, and we
ideally want to avoid using KERN_CONT (as multiple printk()s can race
between different threads), convert the assembly dumping the register
values to C code, and have the C code build the output a line at a
time before dumping to the console.

This avoids the KERN_CONT issue, and also avoids situations where the
output is intermixed with other console activity.

Signed-off-by: Russell King

ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+

2014-07-18T11:29:04+00:00

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 
Tested-by: Stephen Warren  # Tegra Jetson TK1
Tested-by: Robert Jarzmik  # mioa701_bootresume.S
Tested-by: Andrew Lunn  # Kirkwood
Tested-by: Shawn Guo 
Tested-by: Tony Lindgren  # OMAPs
Tested-by: Gregory CLEMENT  # Armada XP, 375, 385
Acked-by: Sekhar Nori  # DaVinci
Acked-by: Christoffer Dall  # kvm/hyp
Acked-by: Haojian Zhuang  # PXA3xx
Acked-by: Stefano Stabellini  # Xen
Tested-by: Uwe Kleine-König  # ARMv7M
Tested-by: Simon Horman  # Shmobile
Signed-off-by: Russell King

ARM: make kernel oops easier to read

2013-12-29T12:32:30+00:00

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

ARM: 7068/1: process: change from __backtrace to dump_stack in show_regs

2011-10-17T08:12:41+00:00

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 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: fix build error in arch/arm/kernel/process.c

2010-04-21T07:45:21+00:00

/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

Thumb-2: Implement the unified arch/arm/lib functions

2009-07-24T11:32:57+00:00

This patch adds the ARM/Thumb-2 unified support for the arch/arm/lib/*
files.

Signed-off-by: Catalin Marinas

[ARM] 5227/1: Add the ENDPROC declarations to the .S files

2008-09-01T11:06:34+00:00

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 
Signed-off-by: Russell King

[ARM] Add ability to dump exception stacks to kernel backtraces

2007-04-21T19:34:34+00:00

Signed-off-by: Russell King