1# SPDX-License-Identifier: GPL-2.0
2# List of files in the vdso
3
4# Include the generic Makefile to check the built vdso.
5include $(srctree)/lib/vdso/Makefile
6obj-vdso32 = vdso_user_wrapper-32.o note-32.o
7
8# Build rules
9
10targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
11obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
12
13KBUILD_AFLAGS += -DBUILD_VDSO
14KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
15
16KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
17KBUILD_AFLAGS_32 += -m31 -s
18
19KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
20KBUILD_CFLAGS_32 := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS))
21KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32))
22KBUILD_CFLAGS_32 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_32))
23KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin -fasynchronous-unwind-tables
24
25LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \
26	--hash-style=both --build-id=sha1 -melf_s390 -T
27
28$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
29$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
30
31obj-y += vdso32_wrapper.o
32targets += vdso32.lds
33CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
34
35# Force dependency (incbin is bad)
36$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
37
38quiet_cmd_vdso_and_check = VDSO    $@
39      cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
40
41$(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-vdso32) FORCE
42	$(call if_changed,vdso_and_check)
43
44# strip rule for the .so file
45$(obj)/%.so: OBJCOPYFLAGS := -S
46$(obj)/%.so: $(obj)/%.so.dbg FORCE
47	$(call if_changed,objcopy)
48
49$(obj-vdso32): %-32.o: %.S FORCE
50	$(call if_changed_dep,vdso32as)
51
52# actual build commands
53quiet_cmd_vdso32as = VDSO32A $@
54      cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
55quiet_cmd_vdso32cc = VDSO32C $@
56      cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $<
57
58# Generate VDSO offsets using helper script
59gen-vdsosym := $(src)/gen_vdso_offsets.sh
60quiet_cmd_vdsosym = VDSOSYM $@
61	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
62
63include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
64	$(call if_changed,vdsosym)
65