linux-kernel - [PATCH v2 0/9] Make check implementation arch agnostic

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Date:   Thu, 30 Jul 2020 10:46:43 +0100
From:   Julien Thierry <jthierry@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org, mbenes@...e.cz,
        raphael.gault@....com, benh@...nel.crashing.org,
        Julien Thierry <jthierry@...hat.com>
Subject: [PATCH v2 0/9] Make check implementation arch agnostic

Hi,

The current implementation of the check subcommand has various x86 bits
here and there. In order to prepare objtool to provide check for other
architectures, add some abstraction over the x86 specific bits, relying
on objtool arch specific code to provide some necessary operations.

This is part of the effort to implement check for arm64, initiated [1]
by Raphael. The series is based on top of the separation of check & orc
subcommands series[2].

I've push both series base on top of tip/objtool/core at [3].

- The first two patches make it simpler for new arches to provide their
list of kernel headers, without worrying about modifications in the x86
headers.
- Patch 3 Moves arch specific macros to more suitable location
- Patches 4 and 5 add abstraction to handle alternatives
- Patch 6 adds abstraction to handle jump table
- Patches 7-9 abstracts the use of unwind hints, so some definitions
  can be shared across architectures while keeping arch specific
  semantics

Changes since v1 [4]:
- Rebased on recent tip/objtool/core
- Split the unwind hint rework into multiple patches as suggested by
  Miroslav

[1] https://lkml.org/lkml/2019/8/16/400
[2] https://lkml.org/lkml/2020/7/30/415
[3] https://github.com/julien-thierry/linux/tree/arch-independent-check
[4] https://lkml.org/lkml/2020/6/8/535

Cheers,

Julien

-->

Julien Thierry (8):
  objtool: Group headers to check in a single list
  objtool: Make sync-check consider the target architecture
  objtool: Move macros describing structures to arch-dependent code
  objtool: Abstract alternative special case handling
  objtool: Make relocation in alternative handling arch dependent
  frame: Only include valid definitions depending on source file type
  frame: Make unwind hints definitions available to other architectures
  objtool: Abstract unwind hint reading

Raphael Gault (1):
  objtool: Refactor switch-tables code to support other architectures

 arch/x86/include/asm/orc_types.h              |  13 --
 arch/x86/include/asm/unwind_hints.h           |  44 +----
 include/linux/frame.h                         |  78 ++++++++
 tools/arch/x86/include/asm/orc_types.h        |  13 --
 tools/include/linux/frame.h                   | 113 ++++++++++++
 tools/objtool/Makefile                        |   2 +-
 tools/objtool/arch.h                          |   5 +-
 tools/objtool/arch/x86/Build                  |   1 +
 tools/objtool/arch/x86/arch_special.c         | 145 +++++++++++++++
 tools/objtool/arch/x86/decode.c               |  54 ++++++
 tools/objtool/arch/x86/include/arch_special.h |  20 +++
 tools/objtool/cfi.h                           |   3 +-
 tools/objtool/check.c                         | 166 ++----------------
 tools/objtool/check.h                         |   7 +-
 tools/objtool/objtool.h                       |   2 +
 tools/objtool/orc_gen.c                       |   4 +-
 tools/objtool/special.c                       |  48 +----
 tools/objtool/special.h                       |  10 ++
 tools/objtool/sync-check.sh                   |  27 ++-
 tools/objtool/weak.c                          |   2 -
 20 files changed, 486 insertions(+), 271 deletions(-)
 create mode 100644 tools/include/linux/frame.h
 create mode 100644 tools/objtool/arch/x86/arch_special.c
 create mode 100644 tools/objtool/arch/x86/include/arch_special.h

--
2.21.3