1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
5 # the inclusion of generic Makefile.
6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
7 include $(srctree)/lib/vdso/Makefile
9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
11 # Common compiler flags between ABIs.
13 $(filter -I%,$(KBUILD_CFLAGS)) \
14 $(filter -E%,$(KBUILD_CFLAGS)) \
15 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
16 $(filter -march=%,$(KBUILD_CFLAGS)) \
17 $(filter -m%-float,$(KBUILD_CFLAGS)) \
18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
23 # The -fno-jump-tables flag only prevents the compiler from generating
24 # jump tables but does not prevent the compiler from emitting absolute
26 cflags-vdso := $(ccflags-vdso) \
27 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
28 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
29 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
30 $(call cc-option, -fno-asynchronous-unwind-tables) \
31 $(call cc-option, -fno-stack-protector)
32 aflags-vdso := $(ccflags-vdso) \
33 -D__ASSEMBLY__ -Wa,-gdwarf-2
35 ifneq ($(c-gettimeofday-y),)
36 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
38 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
39 # library on a 64bit kernel.
40 # Note: Needs to be included before than the generic library.
41 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
42 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45 CFLAGS_REMOVE_vgettimeofday.o = -pg
48 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
49 # the base address of VDSO, the linker will emit a R_MIPS_PC32
50 # relocation in binutils > 2.25 but it will fail with older versions
51 # because that relocation is not supported for that symbol. As a result
52 # of which we are forced to disable the VDSO symbols when building
53 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
54 # can't use other methods to get the base address of VDSO please refer to
55 # the comments on that file.
57 ifndef CONFIG_CPU_MIPSR6
58 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
59 $(warning MIPS VDSO requires binutils >= 2.25)
60 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
61 ccflags-vdso += -DDISABLE_MIPS_VDSO
67 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
68 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
69 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
71 CFLAGS_REMOVE_vdso.o = -pg
77 # Shared build commands.
80 quiet_cmd_vdsold_and_vdso_check = LD $@
81 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
83 quiet_cmd_vdsold = VDSO $@
84 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
85 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
87 quiet_cmd_vdsoas_o_S = AS $@
88 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
90 # Strip rule for the raw .so files
91 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
92 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
93 $(call if_changed,objcopy)
95 hostprogs-y := genvdso
97 quiet_cmd_genvdso = GENVDSO $@
99 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
100 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
107 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
109 targets += $(obj-vdso-y)
111 targets += vdso.so.dbg.raw vdso.so.raw
112 targets += vdso.so.dbg vdso.so
113 targets += vdso-image.c
115 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
117 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
118 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
120 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
122 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
123 $(call if_changed,vdsold_and_vdso_check)
125 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
127 $(call if_changed,genvdso)
129 obj-y += vdso-image.o
135 # Define these outside the ifdef to ensure they are picked up by clean.
136 targets += $(obj-vdso-y:%.o=%-o32.o)
137 targets += vdso-o32.lds
138 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
139 targets += vdso-o32.so.dbg vdso-o32.so
140 targets += vdso-o32-image.c
142 ifdef CONFIG_MIPS32_O32
144 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
146 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
147 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
149 $(obj)/%-o32.o: $(src)/%.S FORCE
150 $(call if_changed_dep,vdsoas_o_S)
152 $(obj)/%-o32.o: $(src)/%.c FORCE
153 $(call cmd,force_checksrc)
154 $(call if_changed_rule,cc_o_c)
156 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
157 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
158 $(call if_changed_dep,cpp_lds_S)
160 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
161 $(call if_changed,vdsold_and_vdso_check)
163 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
164 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
166 $(call if_changed,genvdso)
168 obj-y += vdso-o32-image.o
176 targets += $(obj-vdso-y:%.o=%-n32.o)
177 targets += vdso-n32.lds
178 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
179 targets += vdso-n32.so.dbg vdso-n32.so
180 targets += vdso-n32-image.c
182 ifdef CONFIG_MIPS32_N32
184 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
186 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
187 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
189 $(obj)/%-n32.o: $(src)/%.S FORCE
190 $(call if_changed_dep,vdsoas_o_S)
192 $(obj)/%-n32.o: $(src)/%.c FORCE
193 $(call cmd,force_checksrc)
194 $(call if_changed_rule,cc_o_c)
196 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
197 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
198 $(call if_changed_dep,cpp_lds_S)
200 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
201 $(call if_changed,vdsold_and_vdso_check)
203 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
204 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
206 $(call if_changed,genvdso)
208 obj-y += vdso-n32-image.o
212 # FIXME: Need install rule for debug.
213 # Needs to deal with dependency for generation of dbg by cmd_genvdso...