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 $(filter -I%,$(KBUILD_CFLAGS)) \ 17 $(filter -E%,$(KBUILD_CFLAGS)) \ 18 -D__ASSEMBLY__ -Wa,-gdwarf-2 19 20# 21# For the pre-R6 code in arch/mips/vdso/vdso.h for locating 22# the base address of VDSO, the linker will emit a R_MIPS_PC32 23# relocation in binutils > 2.25 but it will fail with older versions 24# because that relocation is not supported for that symbol. As a result 25# of which we are forced to disable the VDSO symbols when building 26# with < 2.25 binutils on pre-R6 kernels. For more references on why we 27# can't use other methods to get the base address of VDSO please refer to 28# the comments on that file. 29# 30ifndef CONFIG_CPU_MIPSR6 31 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) 32 $(warning MIPS VDSO requires binutils >= 2.25) 33 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y)) 34 ccflags-vdso += -DDISABLE_MIPS_VDSO 35 endif 36endif 37 38# VDSO linker flags. 39VDSO_LDFLAGS := \ 40 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ 41 -nostdlib -shared \ 42 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 43 $(call cc-ldoption, -Wl$(comma)--build-id) 44 45GCOV_PROFILE := n 46 47# 48# Shared build commands. 49# 50 51quiet_cmd_vdsold = VDSO $@ 52 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ 53 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ 54 55# Strip rule for the raw .so files 56$(obj)/%.so.raw: OBJCOPYFLAGS := -S 57$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 58 $(call if_changed,objcopy) 59 60hostprogs-y := genvdso 61 62quiet_cmd_genvdso = GENVDSO $@ 63define cmd_genvdso 64 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 65 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 66endef 67 68# 69# Build native VDSO. 70# 71 72native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 73 74targets += $(obj-vdso-y) 75targets += vdso.lds 76targets += vdso.so.dbg.raw vdso.so.raw 77targets += vdso.so.dbg vdso.so 78targets += vdso-image.c 79 80obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 81 82$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 83$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 84 85$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi) 86 87$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 88 $(call if_changed,vdsold) 89 90$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 91 $(obj)/genvdso FORCE 92 $(call if_changed,genvdso) 93 94obj-y += vdso-image.o 95 96# 97# Build O32 VDSO. 98# 99 100# Define these outside the ifdef to ensure they are picked up by clean. 101targets += $(obj-vdso-y:%.o=%-o32.o) 102targets += vdso-o32.lds 103targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 104targets += vdso-o32.so.dbg vdso-o32.so 105targets += vdso-o32-image.c 106 107ifdef CONFIG_MIPS32_O32 108 109obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 110 111$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 112$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 113 114$(obj)/%-o32.o: $(src)/%.S FORCE 115 $(call if_changed_dep,as_o_S) 116 117$(obj)/%-o32.o: $(src)/%.c FORCE 118 $(call cmd,force_checksrc) 119 $(call if_changed_rule,cc_o_c) 120 121$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32 122$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 123 $(call if_changed_dep,cpp_lds_S) 124 125$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 126 $(call if_changed,vdsold) 127 128$(obj)/vdso-o32-image.c: VDSO_NAME := o32 129$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 130 $(obj)/genvdso FORCE 131 $(call if_changed,genvdso) 132 133obj-y += vdso-o32-image.o 134 135endif 136 137# 138# Build N32 VDSO. 139# 140 141targets += $(obj-vdso-y:%.o=%-n32.o) 142targets += vdso-n32.lds 143targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 144targets += vdso-n32.so.dbg vdso-n32.so 145targets += vdso-n32-image.c 146 147ifdef CONFIG_MIPS32_N32 148 149obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 150 151$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 152$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 153 154$(obj)/%-n32.o: $(src)/%.S FORCE 155 $(call if_changed_dep,as_o_S) 156 157$(obj)/%-n32.o: $(src)/%.c FORCE 158 $(call cmd,force_checksrc) 159 $(call if_changed_rule,cc_o_c) 160 161$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32 162$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 163 $(call if_changed_dep,cpp_lds_S) 164 165$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 166 $(call if_changed,vdsold) 167 168$(obj)/vdso-n32-image.c: VDSO_NAME := n32 169$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 170 $(obj)/genvdso FORCE 171 $(call if_changed,genvdso) 172 173obj-y += vdso-n32-image.o 174 175endif 176 177# FIXME: Need install rule for debug. 178# Needs to deal with dependency for generation of dbg by cmd_genvdso... 179