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)) \
20 ifdef CONFIG_CC_IS_CLANG
21 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
25 # The -fno-jump-tables flag only prevents the compiler from generating
26 # jump tables but does not prevent the compiler from emitting absolute
28 cflags-vdso := $(ccflags-vdso) \
29 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
30 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
31 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
32 $(call cc-option, -fno-asynchronous-unwind-tables) \
33 $(call cc-option, -fno-stack-protector)
34 aflags-vdso := $(ccflags-vdso) \
35 -D__ASSEMBLY__ -Wa,-gdwarf-2
37 ifneq ($(c-gettimeofday-y),)
38 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
40 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
41 # library on a 64bit kernel.
42 # Note: Needs to be included before than the generic library.
43 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
44 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
47 CFLAGS_REMOVE_vgettimeofday.o = -pg
50 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
51 # the base address of VDSO, the linker will emit a R_MIPS_PC32
52 # relocation in binutils > 2.25 but it will fail with older versions
53 # because that relocation is not supported for that symbol. As a result
54 # of which we are forced to disable the VDSO symbols when building
55 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
56 # can't use other methods to get the base address of VDSO please refer to
57 # the comments on that file.
59 ifndef CONFIG_CPU_MIPSR6
60 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
61 $(warning MIPS VDSO requires binutils >= 2.25)
62 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
63 ccflags-vdso += -DDISABLE_MIPS_VDSO
69 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
70 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
71 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
73 CFLAGS_REMOVE_vdso.o = -pg
79 # Shared build commands.
82 quiet_cmd_vdsold_and_vdso_check = LD $@
83 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
85 quiet_cmd_vdsold = VDSO $@
86 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
87 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
89 quiet_cmd_vdsoas_o_S = AS $@
90 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
92 # Strip rule for the raw .so files
93 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
94 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
95 $(call if_changed,objcopy)
97 hostprogs-y := genvdso
99 quiet_cmd_genvdso = GENVDSO $@
101 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
102 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
109 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
111 targets += $(obj-vdso-y)
113 targets += vdso.so.dbg.raw vdso.so.raw
114 targets += vdso.so.dbg vdso.so
115 targets += vdso-image.c
117 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
119 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
120 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
122 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
124 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
125 $(call if_changed,vdsold_and_vdso_check)
127 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
129 $(call if_changed,genvdso)
131 obj-y += vdso-image.o
137 # Define these outside the ifdef to ensure they are picked up by clean.
138 targets += $(obj-vdso-y:%.o=%-o32.o)
139 targets += vdso-o32.lds
140 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
141 targets += vdso-o32.so.dbg vdso-o32.so
142 targets += vdso-o32-image.c
144 ifdef CONFIG_MIPS32_O32
146 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
148 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
149 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
151 $(obj)/%-o32.o: $(src)/%.S FORCE
152 $(call if_changed_dep,vdsoas_o_S)
154 $(obj)/%-o32.o: $(src)/%.c FORCE
155 $(call cmd,force_checksrc)
156 $(call if_changed_rule,cc_o_c)
158 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
159 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
160 $(call if_changed_dep,cpp_lds_S)
162 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
163 $(call if_changed,vdsold_and_vdso_check)
165 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
166 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
168 $(call if_changed,genvdso)
170 obj-y += vdso-o32-image.o
178 targets += $(obj-vdso-y:%.o=%-n32.o)
179 targets += vdso-n32.lds
180 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
181 targets += vdso-n32.so.dbg vdso-n32.so
182 targets += vdso-n32-image.c
184 ifdef CONFIG_MIPS32_N32
186 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
188 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
189 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
191 $(obj)/%-n32.o: $(src)/%.S FORCE
192 $(call if_changed_dep,vdsoas_o_S)
194 $(obj)/%-n32.o: $(src)/%.c FORCE
195 $(call cmd,force_checksrc)
196 $(call if_changed_rule,cc_o_c)
198 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
199 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
200 $(call if_changed_dep,cpp_lds_S)
202 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
203 $(call if_changed,vdsold_and_vdso_check)
205 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
206 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
208 $(call if_changed,genvdso)
210 obj-y += vdso-n32-image.o
214 # FIXME: Need install rule for debug.
215 # Needs to deal with dependency for generation of dbg by cmd_genvdso...