1 # SPDX-License-Identifier: GPL-2.0
2 hostprogs-y := vdsomunge
4 obj-vdso := vgettimeofday.o datapage.o
7 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
8 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
10 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
11 ccflags-y += -DDISABLE_BRANCH_PROFILING
13 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
14 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
15 -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
16 --hash-style=sysv --build-id \
19 obj-$(CONFIG_VDSO) += vdso.o
20 extra-$(CONFIG_VDSO) += vdso.lds
21 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
23 CFLAGS_REMOVE_vdso.o = -pg
25 # Force -O2 to avoid libgcc dependencies
26 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
27 CFLAGS_vgettimeofday.o = -O2
29 # Disable gcov profiling for VDSO code
32 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
36 $(obj)/vdso.o : $(obj)/vdso.so
38 # Link rule for the .so file
39 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
42 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
43 $(call if_changed,vdsomunge)
45 # Strip rule for the .so file
46 $(obj)/%.so: OBJCOPYFLAGS := -S
47 $(obj)/%.so: $(obj)/%.so.dbg FORCE
48 $(call if_changed,objcopy)
50 quiet_cmd_vdsomunge = MUNGE $@
51 cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
54 # Install the unstripped copy of vdso.so.dbg. If our toolchain
55 # supports build-id, install .build-id links as well.
57 # Cribbed from arch/x86/vdso/Makefile.
59 quiet_cmd_vdso_install = INSTALL $<
60 define cmd_vdso_install
61 cp $< "$(MODLIB)/vdso/vdso.so"; \
62 if readelf -n $< | grep -q 'Build ID'; then \
63 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
64 first=`echo $$buildid | cut -b-2`; \
65 last=`echo $$buildid | cut -b3-`; \
66 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
67 ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
72 @mkdir -p $(MODLIB)/vdso
75 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
76 $(call cmd,vdso_install)