49 lines
1.4 KiB
Makefile
49 lines
1.4 KiB
Makefile
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# List of files in the vdso, has to be asm only for now
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obj-vdso64 = note.o sigtramp.o restart_syscall.o
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# Build rules
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targets := $(obj-vdso64) vdso64.so
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obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
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ccflags-y := -shared -fno-common -fno-builtin
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ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
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$(call ld-option, -Wl$(comma)--hash-style=sysv)
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asflags-y := -D__VDSO64__ -s
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KBUILD_AFLAGS += -DBUILD_VDSO
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KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
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VDSO_LIBGCC := $(shell $(CC) -print-libgcc-file-name)
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obj-y += vdso64_wrapper.o
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extra-y += vdso64.lds
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CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
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$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE
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# Force dependency (incbin is bad)
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso64.so: $(src)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC) FORCE
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$(call if_changed,vdso64ld)
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# assembly rules for the .S files
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$(obj-vdso64): %.o: %.S FORCE
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$(call if_changed_dep,vdso64as)
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# actual build commands
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quiet_cmd_vdso64ld = VDSO64L $@
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cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
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quiet_cmd_vdso64as = VDSO64A $@
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cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
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# Generate VDSO offsets using helper script
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gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
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quiet_cmd_vdsosym = VDSOSYM $@
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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include/generated/vdso64-offsets.h: $(obj)/vdso64.so FORCE
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$(call if_changed,vdsosym)
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