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