1# SPDX-License-Identifier: GPL-2.0 2# Objects to go into the VDSO. 3 4# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before 5# the inclusion of generic Makefile. 6ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT 7include $(srctree)/lib/vdso/Makefile 8 9obj-vdso-y := elf.o vgettimeofday.o sigreturn.o 10 11# Common compiler flags between ABIs. 12ccflags-vdso := \ 13 $(filter -I%,$(KBUILD_CFLAGS)) \ 14 $(filter -E%,$(KBUILD_CFLAGS)) \ 15 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 16 $(filter -march=%,$(KBUILD_CFLAGS)) \ 17 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ 19 -D__VDSO__ 20 21ifndef CONFIG_64BIT 22ccflags-vdso += -DBUILD_VDSO32 23endif 24 25ifdef CONFIG_CC_IS_CLANG 26ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) 27endif 28 29# 30# The -fno-jump-tables flag only prevents the compiler from generating 31# jump tables but does not prevent the compiler from emitting absolute 32# offsets. 33cflags-vdso := $(ccflags-vdso) \ 34 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 35 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 36 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 37 $(call cc-option, -fno-asynchronous-unwind-tables) \ 38 $(call cc-option, -fno-stack-protector) 39aflags-vdso := $(ccflags-vdso) \ 40 -D__ASSEMBLY__ -Wa,-gdwarf-2 41 42ifneq ($(c-gettimeofday-y),) 43CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y) 44 45# config-n32-o32-env.c prepares the environment to build a 32bit vDSO 46# library on a 64bit kernel. 47# Note: Needs to be included before than the generic library. 48CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 49CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 50endif 51 52CFLAGS_REMOVE_vgettimeofday.o = -pg 53 54# 55# For the pre-R6 code in arch/mips/vdso/vdso.h for locating 56# the base address of VDSO, the linker will emit a R_MIPS_PC32 57# relocation in binutils > 2.25 but it will fail with older versions 58# because that relocation is not supported for that symbol. As a result 59# of which we are forced to disable the VDSO symbols when building 60# with < 2.25 binutils on pre-R6 kernels. For more references on why we 61# can't use other methods to get the base address of VDSO please refer to 62# the comments on that file. 63# 64ifndef CONFIG_CPU_MIPSR6 65 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) 66 $(warning MIPS VDSO requires binutils >= 2.25) 67 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) 68 ccflags-vdso += -DDISABLE_MIPS_VDSO 69 endif 70endif 71 72# VDSO linker flags. 73VDSO_LDFLAGS := \ 74 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ 75 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \ 76 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id 77 78CFLAGS_REMOVE_vdso.o = -pg 79 80GCOV_PROFILE := n 81UBSAN_SANITIZE := n 82KCOV_INSTRUMENT := n 83 84# 85# Shared build commands. 86# 87 88quiet_cmd_vdsold_and_vdso_check = LD $@ 89 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check) 90 91quiet_cmd_vdsold = VDSO $@ 92 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ 93 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ 94 95quiet_cmd_vdsoas_o_S = AS $@ 96 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 97 98# Strip rule for the raw .so files 99$(obj)/%.so.raw: OBJCOPYFLAGS := -S 100$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 101 $(call if_changed,objcopy) 102 103hostprogs := genvdso 104 105quiet_cmd_genvdso = GENVDSO $@ 106define cmd_genvdso 107 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 108 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 109endef 110 111# 112# Build native VDSO. 113# 114 115native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 116 117targets += $(obj-vdso-y) 118targets += vdso.lds 119targets += vdso.so.dbg.raw vdso.so.raw 120targets += vdso.so.dbg vdso.so 121targets += vdso-image.c 122 123obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 124 125$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 126$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 127 128$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 129 130$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 131 $(call if_changed,vdsold_and_vdso_check) 132 133$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 134 $(obj)/genvdso FORCE 135 $(call if_changed,genvdso) 136 137obj-y += vdso-image.o 138 139# 140# Build O32 VDSO. 141# 142 143# Define these outside the ifdef to ensure they are picked up by clean. 144targets += $(obj-vdso-y:%.o=%-o32.o) 145targets += vdso-o32.lds 146targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 147targets += vdso-o32.so.dbg vdso-o32.so 148targets += vdso-o32-image.c 149 150ifdef CONFIG_MIPS32_O32 151 152obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 153 154$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 155$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 156 157$(obj)/%-o32.o: $(src)/%.S FORCE 158 $(call if_changed_dep,vdsoas_o_S) 159 160$(obj)/%-o32.o: $(src)/%.c FORCE 161 $(call cmd,force_checksrc) 162 $(call if_changed_rule,cc_o_c) 163 164$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 165$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 166 $(call if_changed_dep,cpp_lds_S) 167 168$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 169 $(call if_changed,vdsold_and_vdso_check) 170 171$(obj)/vdso-o32-image.c: VDSO_NAME := o32 172$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 173 $(obj)/genvdso FORCE 174 $(call if_changed,genvdso) 175 176obj-y += vdso-o32-image.o 177 178endif 179 180# 181# Build N32 VDSO. 182# 183 184targets += $(obj-vdso-y:%.o=%-n32.o) 185targets += vdso-n32.lds 186targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 187targets += vdso-n32.so.dbg vdso-n32.so 188targets += vdso-n32-image.c 189 190ifdef CONFIG_MIPS32_N32 191 192obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 193 194$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 195$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 196 197$(obj)/%-n32.o: $(src)/%.S FORCE 198 $(call if_changed_dep,vdsoas_o_S) 199 200$(obj)/%-n32.o: $(src)/%.c FORCE 201 $(call cmd,force_checksrc) 202 $(call if_changed_rule,cc_o_c) 203 204$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 205$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 206 $(call if_changed_dep,cpp_lds_S) 207 208$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 209 $(call if_changed,vdsold_and_vdso_check) 210 211$(obj)/vdso-n32-image.c: VDSO_NAME := n32 212$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 213 $(obj)/genvdso FORCE 214 $(call if_changed,genvdso) 215 216obj-y += vdso-n32-image.o 217 218endif 219 220# FIXME: Need install rule for debug. 221# Needs to deal with dependency for generation of dbg by cmd_genvdso... 222