[RFC,v2,0/8] arm64: Prepare instruction decoder for objtool

Message

Julien Thierry March 3, 2021, 5:05 p.m. UTC

To support arm64, objtool will need to be able to decode aarch64
instructions. This patch series adds some instruction definitions needed
by objtool and moves out encoding/decoding functionalities that do not
rely on kernel code in order.

Changes since v1[1]:
- Split the isolation of instruction encoder/decoder capabilities in
  several steps as suggested by Mark R.
- Exclude dsb encoding where CRm != 0b0x00
- Support dsb FEAT_XS encoding
- Support previously missing barriers

[1] https://lkml.org/lkml/2021/1/20/791

Thanks,

Julien

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Julien Thierry (8):
  arm64: Move patching utilities out of instruction encoding/decoding
  arm64: Move aarch32 condition check functions
  arm64: insn: Reduce header dependencies of instruction decoder
  arm64: Move instruction encoder/decoder under lib/
  arm64: insn: Add SVE instruction class
  arm64: insn: Add barrier encodings
  arm64: insn: Add some opcodes to instruction decoder
  arm64: insn: Add load/store decoding helpers

 arch/arm64/include/asm/alternative-macros.h |   3 -
 arch/arm64/include/asm/insn.h               |  70 +++++-
 arch/arm64/include/asm/patching.h           |  13 +
 arch/arm64/include/asm/probes.h             |   2 +-
 arch/arm64/include/asm/traps.h              |   3 +
 arch/arm64/kernel/Makefile                  |   4 +-
 arch/arm64/kernel/ftrace.c                  |   1 +
 arch/arm64/kernel/jump_label.c              |   1 +
 arch/arm64/kernel/patching.c                | 148 ++++++++++++
 arch/arm64/kernel/probes/simulate-insn.c    |   1 +
 arch/arm64/kernel/traps.c                   | 100 +++++++-
 arch/arm64/lib/Makefile                     |   6 +-
 arch/arm64/{kernel => lib}/insn.c           | 249 +-------------------
 13 files changed, 338 insertions(+), 263 deletions(-)
 create mode 100644 arch/arm64/include/asm/patching.h
 create mode 100644 arch/arm64/kernel/patching.c
 rename arch/arm64/{kernel => lib}/insn.c (86%)

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2.25.4