1 # Objects to go into the VDSO.
2 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
4 # Common compiler flags between ABIs.
6 $(filter -I%,$(KBUILD_CFLAGS)) \
7 $(filter -E%,$(KBUILD_CFLAGS)) \
8 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
9 $(filter -march=%,$(KBUILD_CFLAGS)) \
10 $(filter -m%-float,$(KBUILD_CFLAGS)) \
12 cflags-vdso := $(ccflags-vdso) \
13 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
14 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
15 -DDISABLE_BRANCH_PROFILING \
16 $(call cc-option, -fno-stack-protector)
17 aflags-vdso := $(ccflags-vdso) \
18 $(filter -I%,$(KBUILD_CFLAGS)) \
19 $(filter -E%,$(KBUILD_CFLAGS)) \
20 -D__ASSEMBLY__ -Wa,-gdwarf-2
23 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
24 # the base address of VDSO, the linker will emit a R_MIPS_PC32
25 # relocation in binutils > 2.25 but it will fail with older versions
26 # because that relocation is not supported for that symbol. As a result
27 # of which we are forced to disable the VDSO symbols when building
28 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
29 # can't use other methods to get the base address of VDSO please refer to
30 # the comments on that file.
32 ifndef CONFIG_CPU_MIPSR6
33 ifeq ($(call ld-ifversion, -lt, 22500000, y),y)
34 $(warning MIPS VDSO requires binutils >= 2.25)
35 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
36 ccflags-vdso += -DDISABLE_MIPS_VDSO
42 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
44 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
45 $(call cc-ldoption, -Wl$(comma)--build-id)
50 # Shared build commands.
53 quiet_cmd_vdsold = VDSO $@
54 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
55 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
57 hostprogs-y := genvdso
59 quiet_cmd_genvdso = GENVDSO $@
61 cp $< $(<:%.dbg=%) && \
62 $(OBJCOPY) -S $< $(<:%.dbg=%) && \
63 $(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
70 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
72 targets += $(obj-vdso-y)
73 targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
75 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
77 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
78 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
80 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
82 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
83 $(call if_changed,vdsold)
85 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg $(obj)/genvdso FORCE
86 $(call if_changed,genvdso)
94 # Define these outside the ifdef to ensure they are picked up by clean.
95 targets += $(obj-vdso-y:%.o=%-o32.o)
96 targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
98 ifdef CONFIG_MIPS32_O32
100 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
102 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
103 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
105 $(obj)/%-o32.o: $(src)/%.S FORCE
106 $(call if_changed_dep,as_o_S)
108 $(obj)/%-o32.o: $(src)/%.c FORCE
109 $(call cmd,force_checksrc)
110 $(call if_changed_rule,cc_o_c)
112 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
113 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
114 $(call if_changed_dep,cpp_lds_S)
116 $(obj)/vdso-o32.so.dbg: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
117 $(call if_changed,vdsold)
119 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
120 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg $(obj)/genvdso FORCE
121 $(call if_changed,genvdso)
123 obj-y += vdso-o32-image.o
131 targets += $(obj-vdso-y:%.o=%-n32.o)
132 targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
134 ifdef CONFIG_MIPS32_N32
136 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
138 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
139 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
141 $(obj)/%-n32.o: $(src)/%.S FORCE
142 $(call if_changed_dep,as_o_S)
144 $(obj)/%-n32.o: $(src)/%.c FORCE
145 $(call cmd,force_checksrc)
146 $(call if_changed_rule,cc_o_c)
148 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
149 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
150 $(call if_changed_dep,cpp_lds_S)
152 $(obj)/vdso-n32.so.dbg: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
153 $(call if_changed,vdsold)
155 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
156 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg $(obj)/genvdso FORCE
157 $(call if_changed,genvdso)
159 obj-y += vdso-n32-image.o
163 # FIXME: Need install rule for debug.
164 # Needs to deal with dependency for generation of dbg by cmd_genvdso...