xref: /linux/arch/loongarch/vdso/Makefile (revision 4f9786035f9e519db41375818e1d0b5f20da2f10)
1# SPDX-License-Identifier: GPL-2.0
2# Objects to go into the VDSO.
3
4# Include the generic Makefile to check the built vdso.
5include $(srctree)/lib/vdso/Makefile.include
6
7obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o vgetrandom.o \
8              vgetrandom-chacha.o sigreturn.o
9
10# Common compiler flags between ABIs.
11ccflags-vdso := \
12	$(filter -I%,$(KBUILD_CFLAGS)) \
13	$(filter -E%,$(KBUILD_CFLAGS)) \
14	$(filter -march=%,$(KBUILD_CFLAGS)) \
15	$(filter -m%-float,$(KBUILD_CFLAGS)) \
16	$(CLANG_FLAGS) \
17	-D__VDSO__
18
19cflags-vdso := $(ccflags-vdso) \
20	-isystem $(shell $(CC) -print-file-name=include) \
21	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22	-std=gnu11 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
23	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
24	$(call cc-option, -fno-asynchronous-unwind-tables) \
25	$(call cc-option, -fno-stack-protector)
26aflags-vdso := $(ccflags-vdso) \
27	-D__ASSEMBLY__ -Wa,-gdwarf-2
28
29ifneq ($(c-gettimeofday-y),)
30  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
31endif
32
33ifneq ($(c-getrandom-y),)
34  CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
35endif
36
37# VDSO linker flags.
38ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
39	$(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared --build-id -T
40
41#
42# Shared build commands.
43#
44
45quiet_cmd_vdsold_and_vdso_check = LD      $@
46      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
47
48quiet_cmd_vdsoas_o_S = AS       $@
49      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
50
51# Generate VDSO offsets using helper script
52gen-vdsosym := $(src)/gen_vdso_offsets.sh
53quiet_cmd_vdsosym = VDSOSYM $@
54      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
55
56include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
57	$(call if_changed,vdsosym)
58
59#
60# Build native VDSO.
61#
62
63native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
64
65targets += $(obj-vdso-y)
66targets += vdso.lds vdso.so.dbg vdso.so
67
68obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
69
70$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
71$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
72
73$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
74
75$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
76	$(call if_changed,vdsold_and_vdso_check)
77
78$(obj)/vdso.so: OBJCOPYFLAGS := -S
79$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
80	$(call if_changed,objcopy)
81
82obj-y += vdso.o
83
84$(obj)/vdso.o : $(obj)/vdso.so
85