[PATCH v4 00/22] objtool/arm64: Port klp-build to arm64

[Josh Poimboeuf]

Based on tip/objtool/core + the following fixes:

- https://lore.kernel.org/cover.1786138493.git.jpoimboe@xxxxxxxxxx
- https://lore.kernel.org/ed4fe1f95071897859ec7fbe9176246cbd4962bf.1786138806.git.jpoimboe@xxxxxxxxxx
- https://lore.kernel.org/1b5ccfa8095bdb1277f84af1c2c2e2205aca03ae.1785992188.git.jpoimboe@xxxxxxxxxx

The full set (including the above fixes) can be found on the following branch:

  git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git klp-build-arm64

v4:
- Replace "objtool: Allow empty alternatives" with "arm64: Remove unnecessary empty alternatives" [Peter]
- Add "objtool/klp: Fix .kcfi_traps special section extraction" [Joe]
- Fix vmlinux.o objtool options leaking in from Makefile.lib [Sashiko]
- Tighten jump-to-end-of-function check [Sashiko]
- Drop unneeded linux/kconfig.h include [Sashiko]
- Fix bisectability issue with is_mapping_sym()/is_data_mapping_sym() [Sashiko]
- Add missing ALLOW_ERROR_INJECTION() to arm64 syscall macro [Sashiko]

v3: https://lore.kernel.org/cover.1778642120.git.jpoimboe@xxxxxxxxxx
- Too many changes to list.  Did a lot of testing and fixed a bunch of
  issues (many of which have already been merged in tip/objtool/core).

v2: https://lore.kernel.org/cover.1773787568.git.jpoimboe@xxxxxxxxxx
- patches 1-2 were merged, rebase on tip/master
- improve commit message for "objtool: Extricate checksum calculation from validate_branch()"
- add review tags

v1: https://lore.kernel.org/cover.1772681234.git.jpoimboe@xxxxxxxxxx

Port objtool and the klp-build tooling (for building livepatch modules)
to arm64.

Note this doesn't bring all the objtool bells and whistles to arm64, nor
any of the CFG reverse engineering.  This only adds the bare minimum
needed for 'objtool --checksum'.

And note that objtool still doesn't get enabled at all for normal arm64
kernel builds, so this doesn't affect any users other than those running
klp-build directly.

Josh Poimboeuf (22):
  objtool/klp: Fix .kcfi_traps special section extraction
  klp-build: Reject patches to init/*.c
  arm64: Annotate intra-function calls
  arm64: Fix EFI linking with -fdata-sections
  arm64: Rename TRAMP_VALIAS -> TRAMP_VALIAS_ASM in asm-offsets
  arm64: vdso: Discard .discard.* sections
  arm64: Annotate special section entries
  arm64: Remove unnecessary empty alternatives
  crypto: arm64: Move data to .rodata
  objtool: Allow setting --mnop without --mcount
  kbuild: Only run objtool if there is at least one command
  objtool: Ignore jumps to the end of the function for checksum runs
  objtool: Refactor elf_add_data() to use a growable data buffer
  objtool: Reuse string references
  objtool: Prevent kCFI hashes from being decoded as instructions
  objtool/klp: Add arm64 support for prefix/PFE detection
  objtool/klp: Filter arm64 mapping symbols in find_symbol_by_offset()
  objtool/klp: Don't correlate arm64 mapping symbols
  objtool/klp: Clone inline alternative replacements
  objtool/klp: Introduce objtool for arm64
  klp-build: Support cross-compilation
  klp-build: Add arm64 syscall patching macro

 arch/arm64/Kconfig                            |   2 +
 arch/arm64/include/asm/alternative-macros.h   |  27 +-
 arch/arm64/include/asm/asm-bug.h              |   2 +
 arch/arm64/include/asm/asm-extable.h          |  21 +-
 arch/arm64/include/asm/assembler.h            |   4 +-
 arch/arm64/include/asm/jump_label.h           |   2 +
 arch/arm64/kernel/asm-offsets.c               |   7 +-
 arch/arm64/kernel/entry.S                     |  10 +-
 arch/arm64/kernel/proton-pack.c               |  12 +-
 arch/arm64/kernel/vdso/vdso.lds.S             |   1 +
 arch/arm64/kernel/vmlinux.lds.S               |   2 +-
 arch/x86/boot/startup/Makefile                |   2 +-
 include/linux/annotate.h                      |  14 +-
 include/linux/livepatch_helpers.h             |  20 ++
 include/linux/objtool_types.h                 |   1 +
 lib/crypto/arm64/sha2-armv8.pl                |  18 +-
 scripts/Makefile.build                        |   4 +-
 scripts/Makefile.lib                          |  52 ++--
 scripts/Makefile.vmlinux_o                    |  18 +-
 scripts/livepatch/klp-build                   |  24 +-
 tools/include/linux/objtool_types.h           |   1 +
 tools/objtool/Makefile                        |   4 +
 tools/objtool/arch/arm64/Build                |   2 +
 tools/objtool/arch/arm64/decode.c             | 177 ++++++++++++
 .../arch/arm64/include/arch/cfi_regs.h        |  11 +
 tools/objtool/arch/arm64/include/arch/elf.h   |  15 ++
 .../objtool/arch/arm64/include/arch/special.h |  21 ++
 tools/objtool/arch/arm64/special.c            |  30 +++
 tools/objtool/arch/x86/include/arch/elf.h     |   2 +
 tools/objtool/builtin-check.c                 |   5 -
 tools/objtool/check.c                         |  52 ++--
 tools/objtool/elf.c                           | 170 +++++++-----
 tools/objtool/include/objtool/elf.h           |  48 +++-
 tools/objtool/klp-diff.c                      | 254 ++++++++++++++++--
 tools/objtool/klp-symid.c                     |   2 +-
 35 files changed, 843 insertions(+), 194 deletions(-)
 create mode 100644 tools/objtool/arch/arm64/Build
 create mode 100644 tools/objtool/arch/arm64/decode.c
 create mode 100644 tools/objtool/arch/arm64/include/arch/cfi_regs.h
 create mode 100644 tools/objtool/arch/arm64/include/arch/elf.h
 create mode 100644 tools/objtool/arch/arm64/include/arch/special.h
 create mode 100644 tools/objtool/arch/arm64/special.c

-- 
2.54.0