xref: /openbmc/linux/arch/s390/kernel/vdso32/Makefile (revision 6f2bde9b) 
1# SPDX-License-Identifier: GPL-2.0
2# List of files in the vdso
3
4KCOV_INSTRUMENT := n
5
6# Include the generic Makefile to check the built vdso.
7include $(srctree)/lib/vdso/Makefile
8obj-vdso32 = vdso_user_wrapper-32.o note-32.o
9
10# Build rules
11
12targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
13obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
14
15KBUILD_AFLAGS += -DBUILD_VDSO
16KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
17
18KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
19KBUILD_AFLAGS_32 += -m31 -s
20
21KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
22KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin
23
24LDFLAGS_vdso32.so.dbg += -fPIC -shared -soname=linux-vdso32.so.1 \
25	--hash-style=both --build-id=sha1 -melf_s390 -T
26
27$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
28$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
29
30obj-y += vdso32_wrapper.o
31targets += vdso32.lds
32CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
33
34# Disable gcov profiling, ubsan and kasan for VDSO code
35GCOV_PROFILE := n
36UBSAN_SANITIZE := n
37KASAN_SANITIZE := n
38KCSAN_SANITIZE := n
39
40# Force dependency (incbin is bad)
41$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
42
43$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
44	$(call if_changed,ld)
45
46# strip rule for the .so file
47$(obj)/%.so: OBJCOPYFLAGS := -S
48$(obj)/%.so: $(obj)/%.so.dbg FORCE
49	$(call if_changed,objcopy)
50
51$(obj-vdso32): %-32.o: %.S FORCE
52	$(call if_changed_dep,vdso32as)
53
54# actual build commands
55quiet_cmd_vdso32as = VDSO32A $@
56      cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
57quiet_cmd_vdso32cc = VDSO32C $@
58      cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $<
59
60# install commands for the unstripped file
61quiet_cmd_vdso_install = INSTALL $@
62      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
63
64vdso32.so: $(obj)/vdso32.so.dbg
65	@mkdir -p $(MODLIB)/vdso
66	$(call cmd,vdso_install)
67
68vdso_install: vdso32.so
69
70# Generate VDSO offsets using helper script
71gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
72quiet_cmd_vdsosym = VDSOSYM $@
73	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
74
75include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
76	$(call if_changed,vdsosym)
77