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