xref: /openbmc/linux/arch/arm/vdso/Makefile (revision dc6a81c3) 
1# SPDX-License-Identifier: GPL-2.0
2
3# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
4# the inclusion of generic Makefile.
5ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
6include $(srctree)/lib/vdso/Makefile
7
8hostprogs := vdsomunge
9
10obj-vdso := vgettimeofday.o datapage.o note.o
11
12# Build rules
13targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
14obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
15
16ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
17ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
18
19ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
20ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
21	    -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
22	    --hash-style=sysv --build-id \
23	    -T
24
25obj-$(CONFIG_VDSO) += vdso.o
26extra-$(CONFIG_VDSO) += vdso.lds
27CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
28
29CFLAGS_REMOVE_vdso.o = -pg
30
31# Force -O2 to avoid libgcc dependencies
32CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
33ifeq ($(c-gettimeofday-y),)
34CFLAGS_vgettimeofday.o = -O2
35else
36CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
37endif
38
39# Disable gcov profiling for VDSO code
40GCOV_PROFILE := n
41
42# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
43KCOV_INSTRUMENT := n
44
45# Force dependency
46$(obj)/vdso.o : $(obj)/vdso.so
47
48# Link rule for the .so file
49$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
50	$(call if_changed,vdsold_and_vdso_check)
51
52$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
53	$(call if_changed,vdsomunge)
54
55# Strip rule for the .so file
56$(obj)/%.so: OBJCOPYFLAGS := -S
57$(obj)/%.so: $(obj)/%.so.dbg FORCE
58	$(call if_changed,objcopy)
59
60# Actual build commands
61quiet_cmd_vdsold_and_vdso_check = LD      $@
62      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
63
64quiet_cmd_vdsomunge = MUNGE   $@
65      cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
66
67#
68# Install the unstripped copy of vdso.so.dbg.  If our toolchain
69# supports build-id, install .build-id links as well.
70#
71# Cribbed from arch/x86/vdso/Makefile.
72#
73quiet_cmd_vdso_install = INSTALL $<
74define cmd_vdso_install
75	cp $< "$(MODLIB)/vdso/vdso.so"; \
76	if readelf -n $< | grep -q 'Build ID'; then \
77	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
78	  first=`echo $$buildid | cut -b-2`; \
79	  last=`echo $$buildid | cut -b3-`; \
80	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
81	  ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
82	fi
83endef
84
85$(MODLIB)/vdso: FORCE
86	@mkdir -p $(MODLIB)/vdso
87
88PHONY += vdso_install
89vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
90	$(call cmd,vdso_install)
91