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