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kbuild: Add gendwarfksyms as an alternative to genksyms

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When MODVERSIONS is enabled, allow selecting gendwarfksyms as the
implementation, but default to genksyms.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Sami Tolvanen
2025-01-03 20:45:39 +00:00
committed by Masahiro Yamada
parent d7476f24c9
commit 9c3681f9b9
3 changed files with 52 additions and 7 deletions
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35
scripts/Makefile.build
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@@ -107,13 +107,24 @@ cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
$(obj)/%.i: $(obj)/%.c FORCE
$(call if_changed_dep,cpp_i_c)
getexportsymbols = $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/$(1)/p'
gendwarfksyms = $(objtree)/scripts/gendwarfksyms/gendwarfksyms \
$(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes)) \
$(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable)
genksyms = $(objtree)/scripts/genksyms/genksyms \
$(if $(KBUILD_SYMTYPES), -T $(@:.o=.symtypes)) \
$(if $(KBUILD_PRESERVE), -p) \
$(addprefix -r , $(wildcard $(@:.o=.symref)))
# These mirror gensymtypes_S and co below, keep them in synch.
ifdef CONFIG_GENDWARFKSYMS
cmd_gensymtypes_c = $(if $(skip_gendwarfksyms),, \
$(call getexportsymbols,\1) | $(gendwarfksyms) $@)
else
cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
endif # CONFIG_GENDWARFKSYMS
# LLVM assembly
# Generate .ll files from .c
@@ -286,14 +297,26 @@ $(obj)/%.rs: $(obj)/%.rs.S FORCE
# This is convoluted. The .S file must first be preprocessed to run guards and
# expand names, then the resulting exports must be constructed into plain
# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
# to make the genksyms input.
# to make the genksyms input or compiled into an object for gendwarfksyms.
#
# These mirror gensymtypes_c and co above, keep them in synch.
cmd_gensymtypes_S = \
{ echo "\#include <linux/kernel.h>" ; \
echo "\#include <asm/asm-prototypes.h>" ; \
$(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
getasmexports = \
{ echo "\#include <linux/kernel.h>" ; \
echo "\#include <linux/string.h>" ; \
echo "\#include <asm/asm-prototypes.h>" ; \
$(call getexportsymbols,EXPORT_SYMBOL(\1);) ; }
ifdef CONFIG_GENDWARFKSYMS
cmd_gensymtypes_S = \
$(getasmexports) | \
$(CC) $(c_flags) -c -o $(@:.o=.gendwarfksyms.o) -xc -; \
$(call getexportsymbols,\1) | \
$(gendwarfksyms) $(@:.o=.gendwarfksyms.o)
else
cmd_gensymtypes_S = \
$(getasmexports) | \
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
endif # CONFIG_GENDWARFKSYMS
quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<