forked from mirrors/linux
kbuild: modversions for EXPORT_SYMBOL() for asm
Allow architectures to create asm/asm-prototypes.h file that provides C prototypes for exported asm functions, which enables proper CRC versions to be generated for them. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.com>
This commit is contained in:
Nicholas Piggin
Michal Marek
parent
989cea5c14
commit
4efca4ed05
1 changed files with 72 additions and 6 deletions
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@ -159,7 +159,8 @@ cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(src)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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cmd_gensymtypes = \
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# These mirror gensymtypes_S and co below, keep them in synch.
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cmd_gensymtypes_c = \
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$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
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$(GENKSYMS) $(if $(1), -T $(2)) \
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$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
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@ -169,7 +170,7 @@ cmd_gensymtypes = \
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = \
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set -e; \
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$(call cmd_gensymtypes,true,$@) >/dev/null; \
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$(call cmd_gensymtypes_c,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.c FORCE
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@ -198,9 +199,10 @@ else
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# the actual value of the checksum generated by genksyms
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
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cmd_modversions = \
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cmd_modversions_c = \
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if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
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$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
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@ -268,13 +270,14 @@ endif # CONFIG_STACK_VALIDATION
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define rule_cc_o_c
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$(call echo-cmd,checksrc) $(cmd_checksrc) \
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$(call cmd_and_fixdep,cc_o_c) \
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$(cmd_modversions) \
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$(cmd_modversions_c) \
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$(cmd_objtool) \
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$(call echo-cmd,record_mcount) $(cmd_record_mcount)
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endef
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S) \
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$(cmd_modversions_S) \
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$(cmd_objtool)
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endef
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@ -314,6 +317,39 @@ modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
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$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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# or a file that it includes, in order to get versioned symbols. We build a
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# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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#
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# This is convoluted. The .S file must first be preprocessed to run guards and
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# expand names, then the resulting exports must be constructed into plain
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# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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# to make the genksyms input.
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#
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# These mirror gensymtypes_c and co above, keep them in synch.
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cmd_gensymtypes_S = \
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(echo "\#include <linux/kernel.h>" ; \
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echo "\#include <asm/asm-prototypes.h>" ; \
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$(CPP) $(a_flags) $< | \
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grep ^___EXPORT_SYMBOL | \
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sed 's/___EXPORT_SYMBOL \([a-zA-Z0-9_]*\),.*/EXPORT_SYMBOL(\1);/' ) | \
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$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
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$(GENKSYMS) $(if $(1), -T $(2)) \
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$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
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$(if $(KBUILD_PRESERVE),-p) \
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-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = \
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set -e; \
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$(call cmd_gensymtypes_S,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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@ -321,8 +357,38 @@ $(obj)/%.s: $(src)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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ifndef CONFIG_MODVERSIONS
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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else
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ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
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ifeq ($(ASM_PROTOTYPES),)
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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else
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# versioning matches the C process described above, with difference that
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# we parse asm-prototypes.h C header to get function definitions.
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cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
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cmd_modversions_S = \
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if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
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else \
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mv -f $(@D)/.tmp_$(@F) $@; \
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fi;
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endif
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endif
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$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
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$(call if_changed_rule,as_o_S)
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