1# Objects to go into the VDSO. 2obj-vdso-y := elf.o gettimeofday.o sigreturn.o 3 4# Common compiler flags between ABIs. 5ccflags-vdso := \ 6 $(filter -I%,$(KBUILD_CFLAGS)) \ 7 $(filter -E%,$(KBUILD_CFLAGS)) \ 8 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 9 $(filter -march=%,$(KBUILD_CFLAGS)) 10cflags-vdso := $(ccflags-vdso) \ 11 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 12 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 13 -DDISABLE_BRANCH_PROFILING \ 14 $(call cc-option, -fno-stack-protector) 15aflags-vdso := $(ccflags-vdso) \ 16 -D__ASSEMBLY__ -Wa,-gdwarf-2 17 18# 19# For the pre-R6 code in arch/mips/vdso/vdso.h for locating 20# the base address of VDSO, the linker will emit a R_MIPS_PC32 21# relocation in binutils > 2.25 but it will fail with older versions 22# because that relocation is not supported for that symbol. As a result 23# of which we are forced to disable the VDSO symbols when building 24# with < 2.25 binutils on pre-R6 kernels. For more references on why we 25# can't use other methods to get the base address of VDSO please refer to 26# the comments on that file. 27# 28ifndef CONFIG_CPU_MIPSR6 29 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) 30 $(warning MIPS VDSO requires binutils >= 2.25) 31 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y)) 32 ccflags-vdso += -DDISABLE_MIPS_VDSO 33 endif 34endif 35 36# VDSO linker flags. 37VDSO_LDFLAGS := \ 38 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ 39 -nostdlib -shared \ 40 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 41 $(call cc-ldoption, -Wl$(comma)--build-id) 42 43GCOV_PROFILE := n 44 45# 46# Shared build commands. 47# 48 49quiet_cmd_vdsold = VDSO $@ 50 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ 51 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ 52 53# Strip rule for the raw .so files 54$(obj)/%.so.raw: OBJCOPYFLAGS := -S 55$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 56 $(call if_changed,objcopy) 57 58hostprogs-y := genvdso 59 60quiet_cmd_genvdso = GENVDSO $@ 61define cmd_genvdso 62 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 63 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 64endef 65 66# 67# Build native VDSO. 68# 69 70native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 71 72targets += $(obj-vdso-y) 73targets += vdso.lds 74targets += vdso.so.dbg.raw vdso.so.raw 75targets += vdso.so.dbg vdso.so 76targets += vdso-image.c 77 78obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 79 80$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 81$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 82 83$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 84 85$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 86 $(call if_changed,vdsold) 87 88$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 89 $(obj)/genvdso FORCE 90 $(call if_changed,genvdso) 91 92obj-y += vdso-image.o 93 94# 95# Build O32 VDSO. 96# 97 98# Define these outside the ifdef to ensure they are picked up by clean. 99targets += $(obj-vdso-y:%.o=%-o32.o) 100targets += vdso-o32.lds 101targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 102targets += vdso-o32.so.dbg vdso-o32.so 103targets += vdso-o32-image.c 104 105ifdef CONFIG_MIPS32_O32 106 107obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 108 109$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 110$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 111 112$(obj)/%-o32.o: $(src)/%.S FORCE 113 $(call if_changed_dep,as_o_S) 114 115$(obj)/%-o32.o: $(src)/%.c FORCE 116 $(call cmd,force_checksrc) 117 $(call if_changed_rule,cc_o_c) 118 119$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32 120$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 121 $(call if_changed_dep,cpp_lds_S) 122 123$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 124 $(call if_changed,vdsold) 125 126$(obj)/vdso-o32-image.c: VDSO_NAME := o32 127$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 128 $(obj)/genvdso FORCE 129 $(call if_changed,genvdso) 130 131obj-y += vdso-o32-image.o 132 133endif 134 135# 136# Build N32 VDSO. 137# 138 139targets += $(obj-vdso-y:%.o=%-n32.o) 140targets += vdso-n32.lds 141targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 142targets += vdso-n32.so.dbg vdso-n32.so 143targets += vdso-n32-image.c 144 145ifdef CONFIG_MIPS32_N32 146 147obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 148 149$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 150$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 151 152$(obj)/%-n32.o: $(src)/%.S FORCE 153 $(call if_changed_dep,as_o_S) 154 155$(obj)/%-n32.o: $(src)/%.c FORCE 156 $(call cmd,force_checksrc) 157 $(call if_changed_rule,cc_o_c) 158 159$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32 160$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 161 $(call if_changed_dep,cpp_lds_S) 162 163$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 164 $(call if_changed,vdsold) 165 166$(obj)/vdso-n32-image.c: VDSO_NAME := n32 167$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 168 $(obj)/genvdso FORCE 169 $(call if_changed,genvdso) 170 171obj-y += vdso-n32-image.o 172 173endif 174 175# FIXME: Need install rule for debug. 176# Needs to deal with dependency for generation of dbg by cmd_genvdso... 177