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# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before 8# the inclusion of generic Makefile. 9ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT 10include $(srctree)/lib/vdso/Makefile 11 12obj-vdso-y := elf.o vgettimeofday.o sigreturn.o 13 14# Common compiler flags between ABIs. 15ccflags-vdso := \ 16 $(filter -I%,$(KBUILD_CFLAGS)) \ 17 $(filter -E%,$(KBUILD_CFLAGS)) \ 18 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 19 $(filter -march=%,$(KBUILD_CFLAGS)) \ 20 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 21 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ 22 $(CLANG_FLAGS) \ 23 -D__VDSO__ 24 25ifndef CONFIG_64BIT 26ccflags-vdso += -DBUILD_VDSO32 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 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \ 37 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 38 $(call cc-option, -fno-asynchronous-unwind-tables) 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 = $(CC_FLAGS_FTRACE) 53 54ifdef CONFIG_MIPS_DISABLE_VDSO 55 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) 56endif 57 58# VDSO linker flags. 59ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 60 $(filter -E%,$(KBUILD_CFLAGS)) -shared \ 61 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T 62 63CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) 64 65GCOV_PROFILE := n 66UBSAN_SANITIZE := n 67KCOV_INSTRUMENT := n 68 69# Check that we don't have PIC 'jalr t9' calls left 70quiet_cmd_vdso_mips_check = VDSOCHK $@ 71 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \ 72 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \ 73 rm -f $@; /bin/false); fi 74 75# 76# Shared build commands. 77# 78 79quiet_cmd_vdsold_and_vdso_check = LD $@ 80 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check) 81 82quiet_cmd_vdsoas_o_S = AS $@ 83 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 84 85# Strip rule for the raw .so files 86$(obj)/%.so.raw: OBJCOPYFLAGS := -S 87$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 88 $(call if_changed,objcopy) 89 90hostprogs := genvdso 91 92quiet_cmd_genvdso = GENVDSO $@ 93define cmd_genvdso 94 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 95 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 96endef 97 98# 99# Build native VDSO. 100# 101 102native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 103 104targets += $(obj-vdso-y) 105targets += vdso.lds 106targets += vdso.so.dbg.raw vdso.so.raw 107targets += vdso.so.dbg vdso.so 108targets += vdso-image.c 109 110obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 111 112$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 113$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 114 115$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 116 117$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 118 $(call if_changed,vdsold_and_vdso_check) 119 120$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 121 $(obj)/genvdso FORCE 122 $(call if_changed,genvdso) 123 124obj-y += vdso-image.o 125 126# 127# Build O32 VDSO. 128# 129 130# Define these outside the ifdef to ensure they are picked up by clean. 131targets += $(obj-vdso-y:%.o=%-o32.o) 132targets += vdso-o32.lds 133targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 134targets += vdso-o32.so.dbg vdso-o32.so 135targets += vdso-o32-image.c 136 137ifdef CONFIG_MIPS32_O32 138 139obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 140 141$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 142$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 143 144$(obj)/%-o32.o: $(src)/%.S FORCE 145 $(call if_changed_dep,vdsoas_o_S) 146 147$(obj)/%-o32.o: $(src)/%.c FORCE 148 $(call cmd,force_checksrc) 149 $(call if_changed_rule,cc_o_c) 150 151$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 152$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 153 $(call if_changed_dep,cpp_lds_S) 154 155$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 156 $(call if_changed,vdsold_and_vdso_check) 157 158$(obj)/vdso-o32-image.c: VDSO_NAME := o32 159$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 160 $(obj)/genvdso FORCE 161 $(call if_changed,genvdso) 162 163obj-y += vdso-o32-image.o 164 165endif 166 167# 168# Build N32 VDSO. 169# 170 171targets += $(obj-vdso-y:%.o=%-n32.o) 172targets += vdso-n32.lds 173targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 174targets += vdso-n32.so.dbg vdso-n32.so 175targets += vdso-n32-image.c 176 177ifdef CONFIG_MIPS32_N32 178 179obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 180 181$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 182$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 183 184$(obj)/%-n32.o: $(src)/%.S FORCE 185 $(call if_changed_dep,vdsoas_o_S) 186 187$(obj)/%-n32.o: $(src)/%.c FORCE 188 $(call cmd,force_checksrc) 189 $(call if_changed_rule,cc_o_c) 190 191$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 192$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 193 $(call if_changed_dep,cpp_lds_S) 194 195$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 196 $(call if_changed,vdsold_and_vdso_check) 197 198$(obj)/vdso-n32-image.c: VDSO_NAME := n32 199$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 200 $(obj)/genvdso FORCE 201 $(call if_changed,genvdso) 202 203obj-y += vdso-n32-image.o 204 205endif 206 207# FIXME: Need install rule for debug. 208# Needs to deal with dependency for generation of dbg by cmd_genvdso... 209