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
