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.
Links and History:
[1] Original PowerPC tool approach:
http://patchwork.ozlabs.org/project/linuxppc-dev/patch/[email protected]/
[2] Initial RFC v1:
https://lore.kernel.org/linuxppc-dev/[email protected]/T/#t
[3] PowerPC instruction decoder borrowed from:
https://lore.kernel.org/linuxppc-dev/bfa8364da047d8610a09458a1cd924a0566aedbb.1736955567.git.christophe.le...@csgroup.eu/#Z31tools:objtool:arch:powerpc:decode.c
Testing:
Build and Boot tested on ppc64le, ppc64be, and ppc32be configs.
Changes in V3:
- Split code into individual patches
- Put objtool call into cmd_link_vmlinux
- Move HAVE_OBJTOOL_FEATURE_FIXUP from arch/Kconfig to
arch/powerpc/Kconfig
Changes in V2:
- Added implementation support for ppc64 LE, BE, ppc32 BE.
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 | 8 +-
tools/objtool/arch/powerpc/decode.c | 15 +-
tools/objtool/arch/powerpc/special.c | 437 ++++++++++++++++++++++
tools/objtool/builtin-check.c | 2 +
tools/objtool/check.c | 42 ++-
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, 611 insertions(+), 24 deletions(-)
--
2.43.0
