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# Include the generic Makefile to check the built vdso. 8include $(srctree)/lib/vdso/Makefile 9 10obj-vdso-y := elf.o vgettimeofday.o sigreturn.o 11 12# Common compiler flags between ABIs. 13ccflags-vdso := \ 14 $(filter -I%,$(KBUILD_CFLAGS)) \ 15 $(filter -E%,$(KBUILD_CFLAGS)) \ 16 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 17 $(filter -march=%,$(KBUILD_CFLAGS)) \ 18 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 19 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ 20 $(CLANG_FLAGS) \ 21 -D__VDSO__ 22 23ifndef CONFIG_64BIT 24ccflags-vdso += -DBUILD_VDSO32 25endif 26 27# 28# The -fno-jump-tables flag only prevents the compiler from generating 29# jump tables but does not prevent the compiler from emitting absolute 30# offsets. 31cflags-vdso := $(ccflags-vdso) \ 32 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 33 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 34 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \ 35 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 36 $(call cc-option, -fno-asynchronous-unwind-tables) 37aflags-vdso := $(ccflags-vdso) \ 38 -D__ASSEMBLY__ -Wa,-gdwarf-2 39 40ifneq ($(c-gettimeofday-y),) 41CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y) 42 43# config-n32-o32-env.c prepares the environment to build a 32bit vDSO 44# library on a 64bit kernel. 45# Note: Needs to be included before than the generic library. 46CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 47CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) 48endif 49 50CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) 51 52ifdef CONFIG_MIPS_DISABLE_VDSO 53 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) 54endif 55 56# VDSO linker flags. 57ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 58 $(filter -E%,$(KBUILD_CFLAGS)) -shared \ 59 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T 60 61CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) 62 63GCOV_PROFILE := n 64UBSAN_SANITIZE := n 65KCOV_INSTRUMENT := n 66 67# Check that we don't have PIC 'jalr t9' calls left 68quiet_cmd_vdso_mips_check = VDSOCHK $@ 69 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \ 70 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \ 71 rm -f $@; /bin/false); fi 72 73# 74# Shared build commands. 75# 76 77quiet_cmd_vdsold_and_vdso_check = LD $@ 78 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check) 79 80quiet_cmd_vdsoas_o_S = AS $@ 81 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 82 83# Strip rule for the raw .so files 84$(obj)/%.so.raw: OBJCOPYFLAGS := -S 85$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 86 $(call if_changed,objcopy) 87 88hostprogs := genvdso 89 90quiet_cmd_genvdso = GENVDSO $@ 91define cmd_genvdso 92 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 93 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 94endef 95 96# 97# Build native VDSO. 98# 99 100native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 101 102targets += $(obj-vdso-y) 103targets += vdso.lds 104targets += vdso.so.dbg.raw vdso.so.raw 105targets += vdso.so.dbg vdso.so 106targets += vdso-image.c 107 108obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 109 110$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 111$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 112 113$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 114 115$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 116 $(call if_changed,vdsold_and_vdso_check) 117 118$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 119 $(obj)/genvdso FORCE 120 $(call if_changed,genvdso) 121 122obj-y += vdso-image.o 123 124# 125# Build O32 VDSO. 126# 127 128# Define these outside the ifdef to ensure they are picked up by clean. 129targets += $(obj-vdso-y:%.o=%-o32.o) 130targets += vdso-o32.lds 131targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 132targets += vdso-o32.so.dbg vdso-o32.so 133targets += vdso-o32-image.c 134 135ifdef CONFIG_MIPS32_O32 136 137obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 138 139$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 140$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 141 142$(obj)/%-o32.o: $(src)/%.S FORCE 143 $(call if_changed_dep,vdsoas_o_S) 144 145$(obj)/%-o32.o: $(src)/%.c FORCE 146 $(call cmd,force_checksrc) 147 $(call if_changed_rule,cc_o_c) 148 149$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 150$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 151 $(call if_changed_dep,cpp_lds_S) 152 153$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 154 $(call if_changed,vdsold_and_vdso_check) 155 156$(obj)/vdso-o32-image.c: VDSO_NAME := o32 157$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 158 $(obj)/genvdso FORCE 159 $(call if_changed,genvdso) 160 161obj-y += vdso-o32-image.o 162 163endif 164 165# 166# Build N32 VDSO. 167# 168 169targets += $(obj-vdso-y:%.o=%-n32.o) 170targets += vdso-n32.lds 171targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 172targets += vdso-n32.so.dbg vdso-n32.so 173targets += vdso-n32-image.c 174 175ifdef CONFIG_MIPS32_N32 176 177obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 178 179$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 180$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 181 182$(obj)/%-n32.o: $(src)/%.S FORCE 183 $(call if_changed_dep,vdsoas_o_S) 184 185$(obj)/%-n32.o: $(src)/%.c FORCE 186 $(call cmd,force_checksrc) 187 $(call if_changed_rule,cc_o_c) 188 189$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 190$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 191 $(call if_changed_dep,cpp_lds_S) 192 193$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 194 $(call if_changed,vdsold_and_vdso_check) 195 196$(obj)/vdso-n32-image.c: VDSO_NAME := n32 197$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 198 $(obj)/genvdso FORCE 199 $(call if_changed,genvdso) 200 201obj-y += vdso-n32-image.o 202 203endif 204 205# FIXME: Need install rule for debug. 206# Needs to deal with dependency for generation of dbg by cmd_genvdso... 207