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