objtool/arm64: Port klp-build to arm64

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

- https://lore.kernel.org/[email protected]
- https://lore.kernel.org/ed4fe1f95071897859ec7fbe9176246cbd4962bf.1786138806.git.jpoimboe@kernel.org
- https://lore.kernel.org/1b5ccfa8095bdb1277f84af1c2c2e2205aca03ae.1785992188.git.jpoimboe@kernel.org

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/[email protected]
- 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/[email protected]
- 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/[email protected]

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