1 # SPDX-License-Identifier: GPL-2.0
3 # Include the generic Makefile to check the built vdso.
4 include $(srctree)/lib/vdso/Makefile
8 obj-vdso := vgettimeofday.o datapage.o note.o
11 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
12 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
14 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
15 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
17 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
18 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
19 -z max-page-size=4096 -shared $(ldflags-y) \
20 --hash-style=sysv --build-id=sha1 \
23 obj-$(CONFIG_VDSO) += vdso.o
24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
26 CFLAGS_REMOVE_vdso.o = -pg
28 # Force -O2 to avoid libgcc dependencies
29 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
30 ifeq ($(c-gettimeofday-y),)
31 CFLAGS_vgettimeofday.o = -O2
33 CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
36 # Disable gcov profiling for VDSO code
40 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
46 $(obj)/vdso.o : $(obj)/vdso.so
48 # Link rule for the .so file
49 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
50 $(call if_changed,vdsold_and_vdso_check)
52 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
53 $(call if_changed,vdsomunge)
55 # Strip rule for the .so file
56 $(obj)/%.so: OBJCOPYFLAGS := -S
57 $(obj)/%.so: $(obj)/%.so.dbg FORCE
58 $(call if_changed,objcopy)
60 # Actual build commands
61 quiet_cmd_vdsold_and_vdso_check = LD $@
62 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
64 quiet_cmd_vdsomunge = MUNGE $@
65 cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@