1# SPDX-License-Identifier: GPL-2.0
 2# List of files in the vdso
 3
 4KCOV_INSTRUMENT := n
 5
 6# Include the generic Makefile to check the built vdso.
 7include $(srctree)/lib/vdso/Makefile
 8obj-vdso64 = vdso_user_wrapper.o note.o
 9obj-cvdso64 = vdso64_generic.o getcpu.o
10VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK)
11CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE)
12CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE)
13
14# Build rules
15
16targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg
17obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
18obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64))
19
20KBUILD_AFLAGS += -DBUILD_VDSO
21KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
22
23KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
24KBUILD_AFLAGS_64 += -m64
25
26KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
27KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64))
28KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin
29ldflags-y := -fPIC -shared -soname=linux-vdso64.so.1 \
30	     --hash-style=both --build-id=sha1 -T
31
32$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
33$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
34
35obj-y += vdso64_wrapper.o
36targets += vdso64.lds
37CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
38
39# Disable gcov profiling, ubsan and kasan for VDSO code
40GCOV_PROFILE := n
41UBSAN_SANITIZE := n
42KASAN_SANITIZE := n
43KCSAN_SANITIZE := n
44
45# Force dependency (incbin is bad)
46$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
47
48quiet_cmd_vdso_and_check = VDSO    $@
49      cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
50
51# link rule for the .so file, .lds has to be first
52$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE
53	$(call if_changed,vdso_and_check)
54
55# strip rule for the .so file
56$(obj)/%.so: OBJCOPYFLAGS := -S
57$(obj)/%.so: $(obj)/%.so.dbg FORCE
58	$(call if_changed,objcopy)
59
60# assembly rules for the .S files
61$(obj-vdso64): %.o: %.S FORCE
62	$(call if_changed_dep,vdso64as)
63
64$(obj-cvdso64): %.o: %.c FORCE
65	$(call if_changed_dep,vdso64cc)
66
67# actual build commands
 
 
68quiet_cmd_vdso64as = VDSO64A $@
69      cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
70quiet_cmd_vdso64cc = VDSO64C $@
71      cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $<
72
73# Generate VDSO offsets using helper script
74gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
75quiet_cmd_vdsosym = VDSOSYM $@
76	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
 
 
 
77
78include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
79	$(call if_changed,vdsosym)

 1# List of files in the vdso, has to be asm only for now
 
 2
 3obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o
 
 
 
 
 
 
 
 
 4
 5# Build rules
 6
 7targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
 8obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
 
 
 
 
 9
10KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
11KBUILD_AFLAGS_64 += -m64 -s
12
13KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
14KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
15KBUILD_CFLAGS_64 += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
16			$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
 
17
18$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
19$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
20
21obj-y += vdso64_wrapper.o
22extra-y += vdso64.lds
23CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
24
25# Disable gcov profiling for VDSO code
26GCOV_PROFILE := n
 
 
 
27
28# Force dependency (incbin is bad)
29$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
30
 
 
 
31# link rule for the .so file, .lds has to be first
32$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64)
33	$(call if_changed,vdso64ld)
34
35# strip rule for the .so file
36$(obj)/%.so: OBJCOPYFLAGS := -S
37$(obj)/%.so: $(obj)/%.so.dbg FORCE
38	$(call if_changed,objcopy)
39
40# assembly rules for the .S files
41$(obj-vdso64): %.o: %.S
42	$(call if_changed_dep,vdso64as)
43
 
 
 
44# actual build commands
45quiet_cmd_vdso64ld = VDSO64L $@
46      cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
47quiet_cmd_vdso64as = VDSO64A $@
48      cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
 
 
49
50# install commands for the unstripped file
51quiet_cmd_vdso_install = INSTALL $@
52      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
53
54vdso64.so: $(obj)/vdso64.so.dbg
55	@mkdir -p $(MODLIB)/vdso
56	$(call cmd,vdso_install)
57
58vdso_install: vdso64.so