1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Building a vDSO image for AArch64.
4#
5# Author: Will Deacon <will.deacon@arm.com>
6# Heavily based on the vDSO Makefiles for other archs.
7#
8
9obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o
10
11# Build rules
12targets := $(obj-vdso) vdso.so vdso.so.dbg
13obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
14
15ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \
16	-Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv
17
18# Disable gcov profiling for VDSO code
19GCOV_PROFILE := n
20
21
22obj-y += vdso.o
23targets += vdso.lds
24CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
25
26# Force dependency
27$(obj)/vdso.o : $(obj)/vdso.so
28
29# Link rule for the .so file, .lds has to be first
30$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
31	$(call if_changed,vdsold)
32
33
34# Strip rule for the .so file
35$(obj)/%.so: OBJCOPYFLAGS := -S
36$(obj)/%.so: $(obj)/%.so.dbg FORCE
37	$(call if_changed,objcopy)
38
39# Generate VDSO offsets using helper script
40gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
41quiet_cmd_vdsosym = VDSOSYM $@
42      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
43
44include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
45	$(call if_changed,vdsosym)
46
47
48
49# Assembly rules for the .S files
50
51sigreturn.o : sigreturn.S
52	$(call if_changed_dep,vdsoas)
53
54note.o : note.S
55	$(call if_changed_dep,vdsoas)
56
57datapage.o : datapage.S
58	$(call if_changed_dep,vdsoas)
59
60gettimeofday.o : gettimeofday.c FORCE
61	$(call if_changed_dep,vdsocc)
62
63# Actual build commands
64quiet_cmd_vdsold = VDSOL   $@
65      cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $(real-prereqs) -o $@
66quiet_cmd_vdsoas = VDSOA   $@
67      cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
68quiet_cmd_vdsocc = VDSOA   $@
69      cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
70
71# Install commands for the unstripped file
72quiet_cmd_vdso_install = INSTALL $@
73      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
74
75vdso.so: $(obj)/vdso.so.dbg
76	@mkdir -p $(MODLIB)/vdso
77	$(call cmd,vdso_install)
78
79vdso_install: vdso.so
80