1 # List of files in the vdso, has to be asm only for now
2 
3 obj-vdso64 = note.o sigtramp.o restart_syscall.o
4 
5 # Build rules
6 
7 targets := $(obj-vdso64) vdso64.so
8 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
9 
10 
11 ccflags-y := -shared -fno-common -fno-builtin
12 ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
13 		$(call ld-option, -Wl$(comma)--hash-style=sysv)
14 asflags-y := -D__VDSO64__ -s
15 
16 KBUILD_AFLAGS += -DBUILD_VDSO
17 KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
18 
19 VDSO_LIBGCC := $(shell $(CC) -print-libgcc-file-name)
20 
21 obj-y += vdso64_wrapper.o
22 extra-y += vdso64.lds
23 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
24 
25 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE
26 
27 # Force dependency (incbin is bad)
28 # link rule for the .so file, .lds has to be first
29 $(obj)/vdso64.so: $(src)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC)
30 	$(call if_changed,vdso64ld)
31 
32 # assembly rules for the .S files
33 $(obj-vdso64): %.o: %.S FORCE
34 	$(call if_changed_dep,vdso64as)
35 
36 # actual build commands
37 quiet_cmd_vdso64ld = VDSO64L $@
38       cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
39 quiet_cmd_vdso64as = VDSO64A $@
40       cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
41 
42 # Generate VDSO offsets using helper script
43 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
44 quiet_cmd_vdsosym = VDSOSYM $@
45 	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
46 
47 include/generated/vdso64-offsets.h: $(obj)/vdso64.so FORCE
48 	$(call if_changed,vdsosym)
49