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kbuild: Add generic hook for architectures to use before the final vmlinux link

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On powerpc, we would like to be able to make a pass on vmlinux.o and
generate a new object file to be linked into vmlinux. Add a generic pass
in Makefile.vmlinux that architectures can use for this purpose.

Architectures need to select CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX and must
provide arch/<arch>/tools/Makefile with .arch.vmlinux.o target, which
will be invoked prior to the final vmlinux link step.

Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241030070850.1361304-12-hbathini@linux.ibm.com
This commit is contained in:
Naveen N Rao 2024-10-30 12:38:44 +05:30 committed by Michael Ellerman
parent 782f46cbce
commit 1198c9c689
3 changed files with 19 additions and 1 deletions
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6
arch/Kconfig
View File

@ -1684,4 +1684,10 @@ config CC_HAS_SANE_FUNCTION_ALIGNMENT
config ARCH_NEED_CMPXCHG_1_EMU
bool
config ARCH_WANTS_PRE_LINK_VMLINUX
bool
help
An architecture can select this if it provides arch/<arch>/tools/Makefile
with .arch.vmlinux.o target to be linked into vmlinux.
endmenu

7
scripts/Makefile.vmlinux
View File

@ -22,6 +22,13 @@ targets += .vmlinux.export.o
vmlinux: .vmlinux.export.o
endif
ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX
vmlinux: arch/$(SRCARCH)/tools/vmlinux.arch.o
arch/$(SRCARCH)/tools/vmlinux.arch.o: vmlinux.o FORCE
$(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools $@
endif
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
# Final link of vmlinux with optional arch pass after final link

7
scripts/link-vmlinux.sh
View File

@ -100,7 +100,7 @@ vmlinux_link()
${ld} ${ldflags} -o ${output} \
${wl}--whole-archive ${objs} ${wl}--no-whole-archive \
${wl}--start-group ${libs} ${wl}--end-group \
${kallsymso} ${btf_vmlinux_bin_o} ${ldlibs}
${kallsymso} ${btf_vmlinux_bin_o} ${arch_vmlinux_o} ${ldlibs}
}
# generate .BTF typeinfo from DWARF debuginfo
@ -198,6 +198,11 @@ fi
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o
arch_vmlinux_o=
if is_enabled CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX; then
arch_vmlinux_o=arch/${SRCARCH}/tools/vmlinux.arch.o
fi
btf_vmlinux_bin_o=
kallsymso=
strip_debug=