1# SPDX-License-Identifier: GPL-2.0 2# Objects to go into the VDSO. 3 4# Sanitizer runtimes are unavailable and cannot be linked here. 5 KCSAN_SANITIZE := n 6 7# Include the generic Makefile to check the built vdso. 8include $(srctree)/lib/vdso/Makefile 9 10obj-vdso-y := elf.o vgettimeofday.o sigreturn.o 11 12# Common compiler flags between ABIs. 13ccflags-vdso := \ 14 $(filter -I%,$(KBUILD_CFLAGS)) \ 15 $(filter -E%,$(KBUILD_CFLAGS)) \ 16 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 17 $(filter -march=%,$(KBUILD_CFLAGS)) \ 18 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 19 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ 20 $(CLANG_FLAGS) \ 21 -D__VDSO__ 22 23ifndef CONFIG_64BIT 24ccflags-vdso += -DBUILD_VDSO32 25endif 26 27# 28# The -fno-jump-tables flag only prevents the compiler from generating 29# jump tables but does not prevent the compiler from emitting absolute 30# offsets. 31cflags-vdso := $(ccflags-vdso) \ 32 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 33 $(filter -std=%,$(KBUILD_CFLAGS)) \ 34 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 35 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \ 36 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 37 $(call cc-option, -fno-asynchronous-unwind-tables) 38aflags-vdso := $(ccflags-vdso) \ 39 -D__ASSEMBLY__ -Wa,-gdwarf-2 40 41ifneq ($(c-gettimeofday-y),) 42CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y) 43 44# config-n32-o32-env.c prepares the environment to build a 32bit vDSO 45# library on a 64bit kernel. 46# Note: Needs to be included before than the generic library. 47CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 48CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 49endif 50 51CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) 52 53ifdef CONFIG_MIPS_DISABLE_VDSO 54 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) 55endif 56 57# VDSO linker flags. 58ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 59 $(filter -E%,$(KBUILD_CFLAGS)) -shared \ 60 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T 61 62CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) 63 64GCOV_PROFILE := n 65UBSAN_SANITIZE := n 66KCOV_INSTRUMENT := n 67 68# Check that we don't have PIC 'jalr t9' calls left 69quiet_cmd_vdso_mips_check = VDSOCHK $@ 70 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \ 71 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \ 72 rm -f $@; /bin/false); fi 73 74# 75# Shared build commands. 76# 77 78quiet_cmd_vdsold_and_vdso_check = LD $@ 79 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check) 80 81quiet_cmd_vdsoas_o_S = AS $@ 82 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 83 84# Strip rule for the raw .so files 85$(obj)/%.so.raw: OBJCOPYFLAGS := -S 86$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 87 $(call if_changed,objcopy) 88 89hostprogs := genvdso 90 91quiet_cmd_genvdso = GENVDSO $@ 92define cmd_genvdso 93 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 94 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 95endef 96 97# 98# Build native VDSO. 99# 100 101native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 102 103targets += $(obj-vdso-y) 104targets += vdso.lds 105targets += vdso.so.dbg.raw vdso.so.raw 106targets += vdso.so.dbg vdso.so 107targets += vdso-image.c 108 109obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 110 111$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 112$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 113 114$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 115 116$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 117 $(call if_changed,vdsold_and_vdso_check) 118 119$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 120 $(obj)/genvdso FORCE 121 $(call if_changed,genvdso) 122 123obj-y += vdso-image.o 124 125# 126# Build O32 VDSO. 127# 128 129# Define these outside the ifdef to ensure they are picked up by clean. 130targets += $(obj-vdso-y:%.o=%-o32.o) 131targets += vdso-o32.lds 132targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 133targets += vdso-o32.so.dbg vdso-o32.so 134targets += vdso-o32-image.c 135 136ifdef CONFIG_MIPS32_O32 137 138obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 139 140$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 141$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 142 143$(obj)/%-o32.o: $(src)/%.S FORCE 144 $(call if_changed_dep,vdsoas_o_S) 145 146$(obj)/%-o32.o: $(src)/%.c FORCE 147 $(call cmd,force_checksrc) 148 $(call if_changed_rule,cc_o_c) 149 150$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 151$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 152 $(call if_changed_dep,cpp_lds_S) 153 154$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 155 $(call if_changed,vdsold_and_vdso_check) 156 157$(obj)/vdso-o32-image.c: VDSO_NAME := o32 158$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 159 $(obj)/genvdso FORCE 160 $(call if_changed,genvdso) 161 162obj-y += vdso-o32-image.o 163 164endif 165 166# 167# Build N32 VDSO. 168# 169 170targets += $(obj-vdso-y:%.o=%-n32.o) 171targets += vdso-n32.lds 172targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 173targets += vdso-n32.so.dbg vdso-n32.so 174targets += vdso-n32-image.c 175 176ifdef CONFIG_MIPS32_N32 177 178obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 179 180$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 181$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 182 183$(obj)/%-n32.o: $(src)/%.S FORCE 184 $(call if_changed_dep,vdsoas_o_S) 185 186$(obj)/%-n32.o: $(src)/%.c FORCE 187 $(call cmd,force_checksrc) 188 $(call if_changed_rule,cc_o_c) 189 190$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 191$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 192 $(call if_changed_dep,cpp_lds_S) 193 194$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 195 $(call if_changed,vdsold_and_vdso_check) 196 197$(obj)/vdso-n32-image.c: VDSO_NAME := n32 198$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 199 $(obj)/genvdso FORCE 200 $(call if_changed,genvdso) 201 202obj-y += vdso-n32-image.o 203 204endif 205 206# FIXME: Need install rule for debug. 207# Needs to deal with dependency for generation of dbg by cmd_genvdso... 208