xref: /openbmc/linux/arch/arm/vdso/Makefile (revision cbdf59ad) 
1# SPDX-License-Identifier: GPL-2.0
2hostprogs-y := vdsomunge
3
4obj-vdso := vgettimeofday.o datapage.o
5
6# Build rules
7targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
8obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
9
10ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
11ccflags-y += -DDISABLE_BRANCH_PROFILING
12
13ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
14ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
15	    -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
16	    --hash-style=sysv --build-id \
17	    -T
18
19obj-$(CONFIG_VDSO) += vdso.o
20extra-$(CONFIG_VDSO) += vdso.lds
21CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
22
23CFLAGS_REMOVE_vdso.o = -pg
24
25# Force -O2 to avoid libgcc dependencies
26CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
27CFLAGS_vgettimeofday.o = -O2
28
29# Disable gcov profiling for VDSO code
30GCOV_PROFILE := n
31
32# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
33KCOV_INSTRUMENT := n
34
35# Force dependency
36$(obj)/vdso.o : $(obj)/vdso.so
37
38# Link rule for the .so file
39$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
40	$(call if_changed,ld)
41
42$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
43	$(call if_changed,vdsomunge)
44
45# Strip rule for the .so file
46$(obj)/%.so: OBJCOPYFLAGS := -S
47$(obj)/%.so: $(obj)/%.so.dbg FORCE
48	$(call if_changed,objcopy)
49
50quiet_cmd_vdsomunge = MUNGE   $@
51      cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
52
53#
54# Install the unstripped copy of vdso.so.dbg.  If our toolchain
55# supports build-id, install .build-id links as well.
56#
57# Cribbed from arch/x86/vdso/Makefile.
58#
59quiet_cmd_vdso_install = INSTALL $<
60define 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"; \
68	fi
69endef
70
71$(MODLIB)/vdso: FORCE
72	@mkdir -p $(MODLIB)/vdso
73
74PHONY += vdso_install
75vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
76	$(call cmd,vdso_install)
77