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