xref: /openbmc/linux/arch/arm/vdso/Makefile (revision 65ee8aeb)
1hostprogs-y := vdsomunge
2
3obj-vdso := vgettimeofday.o datapage.o
4
5# Build rules
6targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
7obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
8
9ccflags-y := -shared -fPIC -fno-common -fno-builtin -fno-stack-protector
10ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 -DDISABLE_BRANCH_PROFILING
11ccflags-y += -Wl,--no-undefined $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
12
13obj-$(CONFIG_VDSO) += vdso.o
14extra-$(CONFIG_VDSO) += vdso.lds
15CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
16
17CFLAGS_REMOVE_vdso.o = -pg
18
19# Force -O2 to avoid libgcc dependencies
20CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
21CFLAGS_vgettimeofday.o = -O2
22
23# Disable gcov profiling for VDSO code
24GCOV_PROFILE := n
25
26# Force dependency
27$(obj)/vdso.o : $(obj)/vdso.so
28
29# Link rule for the .so file
30$(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE
31	$(call if_changed,vdsold)
32
33$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
34	$(call if_changed,vdsomunge)
35
36# Strip rule for the .so file
37$(obj)/%.so: OBJCOPYFLAGS := -S
38$(obj)/%.so: $(obj)/%.so.dbg FORCE
39	$(call if_changed,objcopy)
40
41# Actual build commands
42quiet_cmd_vdsold = VDSO    $@
43      cmd_vdsold = $(CC) $(c_flags) -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) \
44                   $(call cc-ldoption, -Wl$(comma)--build-id) \
45                   -Wl,-Bsymbolic -Wl,-z,max-page-size=4096 \
46                   -Wl,-z,common-page-size=4096 -o $@
47
48quiet_cmd_vdsomunge = MUNGE   $@
49      cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
50
51#
52# Install the unstripped copy of vdso.so.dbg.  If our toolchain
53# supports build-id, install .build-id links as well.
54#
55# Cribbed from arch/x86/vdso/Makefile.
56#
57quiet_cmd_vdso_install = INSTALL $<
58define cmd_vdso_install
59	cp $< "$(MODLIB)/vdso/vdso.so"; \
60	if readelf -n $< | grep -q 'Build ID'; then \
61	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
62	  first=`echo $$buildid | cut -b-2`; \
63	  last=`echo $$buildid | cut -b3-`; \
64	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
65	  ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
66	fi
67endef
68
69$(MODLIB)/vdso: FORCE
70	@mkdir -p $(MODLIB)/vdso
71
72PHONY += vdso_install
73vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso FORCE
74	$(call cmd,vdso_install)
75