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Will Deacon a4eb355a3f arm64: vdso: Fix CFI directives in sigreturn trampoline
Daniel reports that the .cfi_startproc is misplaced for the sigreturn
trampoline, which causes LLVM's unwinder to misbehave:

  | I run into this with LLVM’s unwinder.
  | This combination was always broken.

This prompted Dave to question our use of CFI directives more generally,
and I ended up going down a rabbit hole trying to figure out how this
very poorly documented stuff gets used.

Move the CFI directives so that the "mysterious NOP" is included in
the .cfi_{start,end}proc block and add a bunch of comments so that I
can save myself another headache in future.

Cc: Tamas Zsoldos <tamas.zsoldos@arm.com>
Reported-by: Dave Martin <dave.martin@arm.com>
Reported-by: Daniel Kiss <daniel.kiss@arm.com>
Tested-by: Daniel Kiss <daniel.kiss@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
2020-05-21 12:59:26 +01:00
arch arm64: vdso: Fix CFI directives in sigreturn trampoline 2020-05-21 12:59:26 +01:00
block
certs
crypto
Documentation Merge branch 'for-next/bti-user' into for-next/bti 2020-05-05 15:15:58 +01:00
drivers
fs Merge branch 'for-next/bti-user' into for-next/bti 2020-05-05 15:15:58 +01:00
include Merge branches 'for-next/asm' and 'for-next/insn' into for-next/bti 2020-05-05 15:19:09 +01:00
init
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lib Merge branch 'x86/asm' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-next/asm 2020-04-30 17:39:42 +01:00
LICENSES
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tools Merge branch 'x86/asm' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-next/asm 2020-04-30 17:39:42 +01:00
usr
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Makefile Linux 5.7-rc3 2020-04-26 13:51:02 -07:00
README

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

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.