1# SPDX-License-Identifier: GPL-2.0 2# Objects to go into the VDSO. 3obj-vdso-y := elf.o gettimeofday.o sigreturn.o 4 5# Common compiler flags between ABIs. 6ccflags-vdso := \ 7 $(filter -I%,$(KBUILD_CFLAGS)) \ 8 $(filter -E%,$(KBUILD_CFLAGS)) \ 9 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 10 $(filter -march=%,$(KBUILD_CFLAGS)) \ 11 -D__VDSO__ 12 13ifdef CONFIG_CC_IS_CLANG 14ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) 15endif 16 17cflags-vdso := $(ccflags-vdso) \ 18 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 19 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 20 -DDISABLE_BRANCH_PROFILING \ 21 $(call cc-option, -fno-asynchronous-unwind-tables) \ 22 $(call cc-option, -fno-stack-protector) 23aflags-vdso := $(ccflags-vdso) \ 24 -D__ASSEMBLY__ -Wa,-gdwarf-2 25 26# 27# For the pre-R6 code in arch/mips/vdso/vdso.h for locating 28# the base address of VDSO, the linker will emit a R_MIPS_PC32 29# relocation in binutils > 2.25 but it will fail with older versions 30# because that relocation is not supported for that symbol. As a result 31# of which we are forced to disable the VDSO symbols when building 32# with < 2.25 binutils on pre-R6 kernels. For more references on why we 33# can't use other methods to get the base address of VDSO please refer to 34# the comments on that file. 35# 36ifndef CONFIG_CPU_MIPSR6 37 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) 38 $(warning MIPS VDSO requires binutils >= 2.25) 39 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y)) 40 ccflags-vdso += -DDISABLE_MIPS_VDSO 41 endif 42endif 43 44# VDSO linker flags. 45VDSO_LDFLAGS := \ 46 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ 47 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \ 48 -nostdlib -shared \ 49 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 50 $(call cc-ldoption, -Wl$(comma)--build-id) 51 52GCOV_PROFILE := n 53UBSAN_SANITIZE := n 54 55# 56# Shared build commands. 57# 58 59quiet_cmd_vdsold = VDSO $@ 60 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ 61 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ 62 63quiet_cmd_vdsoas_o_S = AS $@ 64 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 65 66# Strip rule for the raw .so files 67$(obj)/%.so.raw: OBJCOPYFLAGS := -S 68$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 69 $(call if_changed,objcopy) 70 71hostprogs-y := genvdso 72 73quiet_cmd_genvdso = GENVDSO $@ 74define cmd_genvdso 75 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 76 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 77endef 78 79# 80# Build native VDSO. 81# 82 83native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 84 85targets += $(obj-vdso-y) 86targets += vdso.lds 87targets += vdso.so.dbg.raw vdso.so.raw 88targets += vdso.so.dbg vdso.so 89targets += vdso-image.c 90 91obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 92 93$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 94$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 95 96$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 97 98$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 99 $(call if_changed,vdsold) 100 101$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 102 $(obj)/genvdso FORCE 103 $(call if_changed,genvdso) 104 105obj-y += vdso-image.o 106 107# 108# Build O32 VDSO. 109# 110 111# Define these outside the ifdef to ensure they are picked up by clean. 112targets += $(obj-vdso-y:%.o=%-o32.o) 113targets += vdso-o32.lds 114targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 115targets += vdso-o32.so.dbg vdso-o32.so 116targets += vdso-o32-image.c 117 118ifdef CONFIG_MIPS32_O32 119 120obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 121 122$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 123$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 124 125$(obj)/%-o32.o: $(src)/%.S FORCE 126 $(call if_changed_dep,vdsoas_o_S) 127 128$(obj)/%-o32.o: $(src)/%.c FORCE 129 $(call cmd,force_checksrc) 130 $(call if_changed_rule,cc_o_c) 131 132$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32 133$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 134 $(call if_changed_dep,cpp_lds_S) 135 136$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 137 $(call if_changed,vdsold) 138 139$(obj)/vdso-o32-image.c: VDSO_NAME := o32 140$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 141 $(obj)/genvdso FORCE 142 $(call if_changed,genvdso) 143 144obj-y += vdso-o32-image.o 145 146endif 147 148# 149# Build N32 VDSO. 150# 151 152targets += $(obj-vdso-y:%.o=%-n32.o) 153targets += vdso-n32.lds 154targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 155targets += vdso-n32.so.dbg vdso-n32.so 156targets += vdso-n32-image.c 157 158ifdef CONFIG_MIPS32_N32 159 160obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 161 162$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 163$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 164 165$(obj)/%-n32.o: $(src)/%.S FORCE 166 $(call if_changed_dep,vdsoas_o_S) 167 168$(obj)/%-n32.o: $(src)/%.c FORCE 169 $(call cmd,force_checksrc) 170 $(call if_changed_rule,cc_o_c) 171 172$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32 173$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 174 $(call if_changed_dep,cpp_lds_S) 175 176$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 177 $(call if_changed,vdsold) 178 179$(obj)/vdso-n32-image.c: VDSO_NAME := n32 180$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 181 $(obj)/genvdso FORCE 182 $(call if_changed,genvdso) 183 184obj-y += vdso-n32-image.o 185 186endif 187 188# FIXME: Need install rule for debug. 189# Needs to deal with dependency for generation of dbg by cmd_genvdso... 190