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