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 -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 = -pg 53 54ifdef CONFIG_MIPS_DISABLE_VDSO 55 ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO 56 $(warning MIPS VDSO requires binutils >= 2.25) 57 endif 58 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) 59endif 60 61# VDSO linker flags. 62ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 63 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ 64 -G 0 --eh-frame-hdr --hash-style=sysv --build-id -T 65 66CFLAGS_REMOVE_vdso.o = -pg 67 68GCOV_PROFILE := n 69UBSAN_SANITIZE := n 70KCOV_INSTRUMENT := n 71 72# Check that we don't have PIC 'jalr t9' calls left 73quiet_cmd_vdso_mips_check = VDSOCHK $@ 74 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \ 75 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \ 76 rm -f $@; /bin/false); fi 77 78# 79# Shared build commands. 80# 81 82quiet_cmd_vdsold_and_vdso_check = LD $@ 83 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check) 84 85quiet_cmd_vdsoas_o_S = AS $@ 86 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 87 88# Strip rule for the raw .so files 89$(obj)/%.so.raw: OBJCOPYFLAGS := -S 90$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 91 $(call if_changed,objcopy) 92 93hostprogs := genvdso 94 95quiet_cmd_genvdso = GENVDSO $@ 96define cmd_genvdso 97 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 98 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 99endef 100 101# 102# Build native VDSO. 103# 104 105native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 106 107targets += $(obj-vdso-y) 108targets += vdso.lds 109targets += vdso.so.dbg.raw vdso.so.raw 110targets += vdso.so.dbg vdso.so 111targets += vdso-image.c 112 113obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 114 115$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 116$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 117 118$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 119 120$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 121 $(call if_changed,vdsold_and_vdso_check) 122 123$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 124 $(obj)/genvdso FORCE 125 $(call if_changed,genvdso) 126 127obj-y += vdso-image.o 128 129# 130# Build O32 VDSO. 131# 132 133# Define these outside the ifdef to ensure they are picked up by clean. 134targets += $(obj-vdso-y:%.o=%-o32.o) 135targets += vdso-o32.lds 136targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 137targets += vdso-o32.so.dbg vdso-o32.so 138targets += vdso-o32-image.c 139 140ifdef CONFIG_MIPS32_O32 141 142obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 143 144$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 145$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 146 147$(obj)/%-o32.o: $(src)/%.S FORCE 148 $(call if_changed_dep,vdsoas_o_S) 149 150$(obj)/%-o32.o: $(src)/%.c FORCE 151 $(call cmd,force_checksrc) 152 $(call if_changed_rule,cc_o_c) 153 154$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 155$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 156 $(call if_changed_dep,cpp_lds_S) 157 158$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 159 $(call if_changed,vdsold_and_vdso_check) 160 161$(obj)/vdso-o32-image.c: VDSO_NAME := o32 162$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 163 $(obj)/genvdso FORCE 164 $(call if_changed,genvdso) 165 166obj-y += vdso-o32-image.o 167 168endif 169 170# 171# Build N32 VDSO. 172# 173 174targets += $(obj-vdso-y:%.o=%-n32.o) 175targets += vdso-n32.lds 176targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 177targets += vdso-n32.so.dbg vdso-n32.so 178targets += vdso-n32-image.c 179 180ifdef CONFIG_MIPS32_N32 181 182obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 183 184$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 185$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 186 187$(obj)/%-n32.o: $(src)/%.S FORCE 188 $(call if_changed_dep,vdsoas_o_S) 189 190$(obj)/%-n32.o: $(src)/%.c FORCE 191 $(call cmd,force_checksrc) 192 $(call if_changed_rule,cc_o_c) 193 194$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 195$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 196 $(call if_changed_dep,cpp_lds_S) 197 198$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 199 $(call if_changed,vdsold_and_vdso_check) 200 201$(obj)/vdso-n32-image.c: VDSO_NAME := n32 202$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 203 $(obj)/genvdso FORCE 204 $(call if_changed,genvdso) 205 206obj-y += vdso-n32-image.o 207 208endif 209 210# FIXME: Need install rule for debug. 211# Needs to deal with dependency for generation of dbg by cmd_genvdso... 212