Messages in this thread |  | | From | Sathvika Vasireddy <> | | Subject | [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses | | Date | Tue, 5 May 2026 14:16:22 +0530 |
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This patch series implements build-time fixup of alternate feature relative addresses for powerpc.
Previously, Nicholas Piggin proposed a build-time solution using a custom PowerPC tool [1], which provided the foundation for this approach. The current implementation leverages objtool's existing ELF parsing infrastructure to do the same.
This patchset applies atop powerpc/merge branch.
[1] Original PowerPC tool approach: http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170521010130.13552-1-npiggin@gmail.com/
Testing: Build and Boot tested on ppc64le, ppc64be, and ppc32be configs.
Sathvika Vasireddy (6): objtool/powerpc: Add build-time fixup of alternate feature branch targets objtool: Set ELF_F_LAYOUT flag to preserve vmlinux segment layout objtool: Fix "can't find starting instruction" warnings on vmlinux objtool/powerpc: Skip jump destination analysis and unnanotated intra-function call warnings for --ftr-fixup kbuild: Add objtool integration for PowerPC feature fixups powerpc: Enable build-time feature fixup processing by default
Makefile | 7 + arch/powerpc/Kconfig | 3 + arch/powerpc/Makefile | 5 + arch/powerpc/include/asm/feature-fixups.h | 2 +- arch/powerpc/kernel/vmlinux.lds.S | 8 +- arch/powerpc/lib/feature-fixups.c | 12 - scripts/Makefile.lib | 4 +- scripts/Makefile.vmlinux | 11 +- tools/objtool/arch/powerpc/decode.c | 15 +- tools/objtool/arch/powerpc/special.c | 451 ++++++++++++++++++++++ tools/objtool/builtin-check.c | 2 + tools/objtool/check.c | 57 ++- tools/objtool/elf.c | 4 + tools/objtool/include/objtool/builtin.h | 1 + tools/objtool/include/objtool/special.h | 56 +++ tools/objtool/special.c | 29 ++ 16 files changed, 637 insertions(+), 30 deletions(-)
-- 2.43.0
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