1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
3 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
5 # Common compiler flags between ABIs.
7 $(filter -I%,$(KBUILD_CFLAGS)) \
8 $(filter -E%,$(KBUILD_CFLAGS)) \
9 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
10 $(filter -march=%,$(KBUILD_CFLAGS)) \
11 $(filter -m%-float,$(KBUILD_CFLAGS)) \
12 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
14 cflags-vdso := $(ccflags-vdso) \
15 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
16 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
17 -DDISABLE_BRANCH_PROFILING \
18 $(call cc-option, -fno-asynchronous-unwind-tables) \
19 $(call cc-option, -fno-stack-protector)
20 aflags-vdso := $(ccflags-vdso) \
21 -D__ASSEMBLY__ -Wa,-gdwarf-2
24 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
25 # the base address of VDSO, the linker will emit a R_MIPS_PC32
26 # relocation in binutils > 2.25 but it will fail with older versions
27 # because that relocation is not supported for that symbol. As a result
28 # of which we are forced to disable the VDSO symbols when building
29 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
30 # can't use other methods to get the base address of VDSO please refer to
31 # the comments on that file.
33 ifndef CONFIG_CPU_MIPSR6
34 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
35 $(warning MIPS VDSO requires binutils >= 2.25)
36 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
37 ccflags-vdso += -DDISABLE_MIPS_VDSO
43 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
45 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
46 $(call cc-ldoption, -Wl$(comma)--build-id)
51 # Shared build commands.
54 quiet_cmd_vdsold = VDSO $@
55 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
56 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
58 quiet_cmd_vdsoas_o_S = AS $@
59 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
61 # Strip rule for the raw .so files
62 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
63 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
64 $(call if_changed,objcopy)
66 hostprogs-y := genvdso
68 quiet_cmd_genvdso = GENVDSO $@
70 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
71 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
78 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
80 targets += $(obj-vdso-y)
82 targets += vdso.so.dbg.raw vdso.so.raw
83 targets += vdso.so.dbg vdso.so
84 targets += vdso-image.c
86 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
88 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
89 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
91 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
93 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
94 $(call if_changed,vdsold)
96 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
98 $(call if_changed,genvdso)
100 obj-y += vdso-image.o
106 # Define these outside the ifdef to ensure they are picked up by clean.
107 targets += $(obj-vdso-y:%.o=%-o32.o)
108 targets += vdso-o32.lds
109 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
110 targets += vdso-o32.so.dbg vdso-o32.so
111 targets += vdso-o32-image.c
113 ifdef CONFIG_MIPS32_O32
115 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
117 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
118 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
120 $(obj)/%-o32.o: $(src)/%.S FORCE
121 $(call if_changed_dep,vdsoas_o_S)
123 $(obj)/%-o32.o: $(src)/%.c FORCE
124 $(call cmd,force_checksrc)
125 $(call if_changed_rule,cc_o_c)
127 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
128 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
129 $(call if_changed_dep,cpp_lds_S)
131 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
132 $(call if_changed,vdsold)
134 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
135 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
137 $(call if_changed,genvdso)
139 obj-y += vdso-o32-image.o
147 targets += $(obj-vdso-y:%.o=%-n32.o)
148 targets += vdso-n32.lds
149 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
150 targets += vdso-n32.so.dbg vdso-n32.so
151 targets += vdso-n32-image.c
153 ifdef CONFIG_MIPS32_N32
155 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
157 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
158 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
160 $(obj)/%-n32.o: $(src)/%.S FORCE
161 $(call if_changed_dep,vdsoas_o_S)
163 $(obj)/%-n32.o: $(src)/%.c FORCE
164 $(call cmd,force_checksrc)
165 $(call if_changed_rule,cc_o_c)
167 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
168 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
169 $(call if_changed_dep,cpp_lds_S)
171 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
172 $(call if_changed,vdsold)
174 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
175 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
177 $(call if_changed,genvdso)
179 obj-y += vdso-n32-image.o
183 # FIXME: Need install rule for debug.
184 # Needs to deal with dependency for generation of dbg by cmd_genvdso...