1# SPDX-License-Identifier: GPL-2.0
2
3# Include the generic Makefile to check the built vdso.
4include $(srctree)/lib/vdso/Makefile
5
6hostprogs := vdsomunge
7
8obj-vdso := vgettimeofday.o datapage.o note.o
9
10# Build rules
11targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
12obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
13
14ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
15ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
16
17ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
18ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
19	    -z max-page-size=4096 -shared $(ldflags-y) \
20	    --hash-style=sysv --build-id=sha1 \
21	    -T
22
23obj-$(CONFIG_VDSO) += vdso.o
24CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
25
26CFLAGS_REMOVE_vdso.o = -pg
27
28# Force -O2 to avoid libgcc dependencies
29CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
30ifeq ($(c-gettimeofday-y),)
31CFLAGS_vgettimeofday.o = -O2
32else
33CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
34endif
35
36# Force dependency
37$(obj)/vdso.o : $(obj)/vdso.so
38
39# Link rule for the .so file
40$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
41	$(call if_changed,vdsold_and_vdso_check)
42
43$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
44	$(call if_changed,vdsomunge)
45
46# Strip rule for the .so file
47$(obj)/%.so: OBJCOPYFLAGS := -S
48$(obj)/%.so: $(obj)/%.so.dbg FORCE
49	$(call if_changed,objcopy)
50
51# Actual build commands
52quiet_cmd_vdsold_and_vdso_check = LD      $@
53      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
54
55quiet_cmd_vdsomunge = MUNGE   $@
56      cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
57