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)) \
16 cflags-vdso := $(ccflags-vdso) \
17 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
18 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
19 -DDISABLE_BRANCH_PROFILING \
20 $(call cc-option, -fno-asynchronous-unwind-tables) \
21 $(call cc-option, -fno-stack-protector)
22 aflags-vdso := $(ccflags-vdso) \
23 -D__ASSEMBLY__ -Wa,-gdwarf-2
26 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
27 # the base address of VDSO, the linker will emit a R_MIPS_PC32
28 # relocation in binutils > 2.25 but it will fail with older versions
29 # because that relocation is not supported for that symbol. As a result
30 # of which we are forced to disable the VDSO symbols when building
31 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
32 # can't use other methods to get the base address of VDSO please refer to
33 # the comments on that file.
35 ifndef CONFIG_CPU_MIPSR6
36 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
37 $(warning MIPS VDSO requires binutils >= 2.25)
38 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
39 ccflags-vdso += -DDISABLE_MIPS_VDSO
45 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
46 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
48 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
49 $(call cc-ldoption, -Wl$(comma)--build-id)
54 # Shared build commands.
57 quiet_cmd_vdsold = VDSO $@
58 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
59 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
61 quiet_cmd_vdsoas_o_S = AS $@
62 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
64 # Strip rule for the raw .so files
65 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
66 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
67 $(call if_changed,objcopy)
69 hostprogs-y := genvdso
71 quiet_cmd_genvdso = GENVDSO $@
73 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
74 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
81 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
83 targets += $(obj-vdso-y)
85 targets += vdso.so.dbg.raw vdso.so.raw
86 targets += vdso.so.dbg vdso.so
87 targets += vdso-image.c
89 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
91 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
92 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
94 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
96 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
97 $(call if_changed,vdsold)
99 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
101 $(call if_changed,genvdso)
103 obj-y += vdso-image.o
109 # Define these outside the ifdef to ensure they are picked up by clean.
110 targets += $(obj-vdso-y:%.o=%-o32.o)
111 targets += vdso-o32.lds
112 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
113 targets += vdso-o32.so.dbg vdso-o32.so
114 targets += vdso-o32-image.c
116 ifdef CONFIG_MIPS32_O32
118 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
120 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
121 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
123 $(obj)/%-o32.o: $(src)/%.S FORCE
124 $(call if_changed_dep,vdsoas_o_S)
126 $(obj)/%-o32.o: $(src)/%.c FORCE
127 $(call cmd,force_checksrc)
128 $(call if_changed_rule,cc_o_c)
130 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
131 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
132 $(call if_changed_dep,cpp_lds_S)
134 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
135 $(call if_changed,vdsold)
137 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
138 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
140 $(call if_changed,genvdso)
142 obj-y += vdso-o32-image.o
150 targets += $(obj-vdso-y:%.o=%-n32.o)
151 targets += vdso-n32.lds
152 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
153 targets += vdso-n32.so.dbg vdso-n32.so
154 targets += vdso-n32-image.c
156 ifdef CONFIG_MIPS32_N32
158 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
160 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
161 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
163 $(obj)/%-n32.o: $(src)/%.S FORCE
164 $(call if_changed_dep,vdsoas_o_S)
166 $(obj)/%-n32.o: $(src)/%.c FORCE
167 $(call cmd,force_checksrc)
168 $(call if_changed_rule,cc_o_c)
170 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
171 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
172 $(call if_changed_dep,cpp_lds_S)
174 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
175 $(call if_changed,vdsold)
177 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
178 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
180 $(call if_changed,genvdso)
182 obj-y += vdso-n32-image.o
186 # FIXME: Need install rule for debug.
187 # Needs to deal with dependency for generation of dbg by cmd_genvdso...