arch/mips/vdso/Makefile - linux - Git at Google

 # SPDX-License-Identifier: GPL-2.0
 # Objects to go into the VDSO.

 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
 # the inclusion of generic Makefile.
 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
 include $(srctree)/lib/vdso/Makefile

 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o

 # Common compiler flags between ABIs.
 ccflags-vdso := \
 	$(filter -I%,$(KBUILD_CFLAGS)) \
 	$(filter -E%,$(KBUILD_CFLAGS)) \
 	$(filter -mmicromips,$(KBUILD_CFLAGS)) \
 	$(filter -march=%,$(KBUILD_CFLAGS)) \
 	$(filter -m%-float,$(KBUILD_CFLAGS)) \
 	$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
 	-D__VDSO__

 ifndef CONFIG_64BIT
 ccflags-vdso += -DBUILD_VDSO32
 endif

 ifdef CONFIG_CC_IS_CLANG
 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
 endif

 #
 # The -fno-jump-tables flag only prevents the compiler from generating
 # jump tables but does not prevent the compiler from emitting absolute
 # offsets.
 cflags-vdso := $(ccflags-vdso) \
 	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
 	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
 	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
 	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
 	$(call cc-option, -fno-asynchronous-unwind-tables) \
 	$(call cc-option, -fno-stack-protector)
 aflags-vdso := $(ccflags-vdso) \
 	-D__ASSEMBLY__ -Wa,-gdwarf-2

 ifneq ($(c-gettimeofday-y),)
 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)

 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
 # library on a 64bit kernel.
 # Note: Needs to be included before than the generic library.
 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
 endif

 CFLAGS_REMOVE_vgettimeofday.o = -pg

 DISABLE_VDSO := n

 #
 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
 # the base address of VDSO, the linker will emit a R_MIPS_PC32
 # relocation in binutils > 2.25 but it will fail with older versions
 # because that relocation is not supported for that symbol. As a result
 # of which we are forced to disable the VDSO symbols when building
 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
 # can't use other methods to get the base address of VDSO please refer to
 # the comments on that file.
 #
 ifndef CONFIG_CPU_MIPSR6
   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
     $(warning MIPS VDSO requires binutils >= 2.25)
     DISABLE_VDSO := y
   endif
 endif

 #
 # GCC (at least up to version 9.2) appears to emit function calls that make use
 # of the GOT when targeting microMIPS, which we can't use in the VDSO due to
 # the lack of relocations. As such, we disable the VDSO for microMIPS builds.
 #
 ifdef CONFIG_CPU_MICROMIPS
   DISABLE_VDSO := y
 endif

 ifeq ($(DISABLE_VDSO),y)
   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
   ccflags-vdso += -DDISABLE_MIPS_VDSO
 endif

 # VDSO linker flags.
 VDSO_LDFLAGS := \
 	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
 	$(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
 	-nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id

 CFLAGS_REMOVE_vdso.o = -pg

 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
 KCOV_INSTRUMENT := n

 # Check that we don't have PIC 'jalr t9' calls left
 quiet_cmd_vdso_mips_check = VDSOCHK $@
       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
 		       then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
 			     rm -f $@; /bin/false); fi

 #
 # Shared build commands.
 #

 quiet_cmd_vdsold_and_vdso_check = LD      $@
       cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check); $(cmd_vdso_mips_check)

 quiet_cmd_vdsold = VDSO    $@
       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@

 quiet_cmd_vdsoas_o_S = AS      $@
       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<

 # Strip rule for the raw .so files
 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
 	$(call if_changed,objcopy)

 hostprogs := genvdso

 quiet_cmd_genvdso = GENVDSO $@
 define cmd_genvdso
 	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
 	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
 endef

 #
 # Build native VDSO.
 #

 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))

 targets += $(obj-vdso-y)
 targets += vdso.lds
 targets += vdso.so.dbg.raw vdso.so.raw
 targets += vdso.so.dbg vdso.so
 targets += vdso-image.c

 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)

 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)

 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)

 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 	$(call if_changed,vdsold_and_vdso_check)

 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
                      $(obj)/genvdso FORCE
 	$(call if_changed,genvdso)

 obj-y += vdso-image.o

 #
 # Build O32 VDSO.
 #

 # Define these outside the ifdef to ensure they are picked up by clean.
 targets += $(obj-vdso-y:%.o=%-o32.o)
 targets += vdso-o32.lds
 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 targets += vdso-o32.so.dbg vdso-o32.so
 targets += vdso-o32-image.c

 ifdef CONFIG_MIPS32_O32

 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)

 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32

 $(obj)/%-o32.o: $(src)/%.S FORCE
 	$(call if_changed_dep,vdsoas_o_S)

 $(obj)/%-o32.o: $(src)/%.c FORCE
 	$(call cmd,force_checksrc)
 	$(call if_changed_rule,cc_o_c)

 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 	$(call if_changed_dep,cpp_lds_S)

 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 	$(call if_changed,vdsold_and_vdso_check)

 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
                          $(obj)/genvdso FORCE
 	$(call if_changed,genvdso)

 obj-y += vdso-o32-image.o

 endif

 #
 # Build N32 VDSO.
 #

 targets += $(obj-vdso-y:%.o=%-n32.o)
 targets += vdso-n32.lds
 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 targets += vdso-n32.so.dbg vdso-n32.so
 targets += vdso-n32-image.c

 ifdef CONFIG_MIPS32_N32

 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)

 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32

 $(obj)/%-n32.o: $(src)/%.S FORCE
 	$(call if_changed_dep,vdsoas_o_S)

 $(obj)/%-n32.o: $(src)/%.c FORCE
 	$(call cmd,force_checksrc)
 	$(call if_changed_rule,cc_o_c)

 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 	$(call if_changed_dep,cpp_lds_S)

 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 	$(call if_changed,vdsold_and_vdso_check)

 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
                          $(obj)/genvdso FORCE
 	$(call if_changed,genvdso)

 obj-y += vdso-n32-image.o

 endif

 # FIXME: Need install rule for debug.
 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
	# SPDX-License-Identifier: GPL-2.0
	# Objects to go into the VDSO.

	# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
	# the inclusion of generic Makefile.
	ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT\|R_MIPS_GLOB_DAT
	include $(srctree)/lib/vdso/Makefile

	obj-vdso-y := elf.o vgettimeofday.o sigreturn.o

	# Common compiler flags between ABIs.
	ccflags-vdso := \
	$(filter -I%,$(KBUILD_CFLAGS)) \
	$(filter -E%,$(KBUILD_CFLAGS)) \
	$(filter -mmicromips,$(KBUILD_CFLAGS)) \
	$(filter -march=%,$(KBUILD_CFLAGS)) \
	$(filter -m%-float,$(KBUILD_CFLAGS)) \
	$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
	-D__VDSO__

	ifndef CONFIG_64BIT
	ccflags-vdso += -DBUILD_VDSO32
	endif

	ifdef CONFIG_CC_IS_CLANG
	ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
	endif

	#
	# The -fno-jump-tables flag only prevents the compiler from generating
	# jump tables but does not prevent the compiler from emitting absolute
	# offsets.
	cflags-vdso := $(ccflags-vdso) \
	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
	$(call cc-option, -fno-asynchronous-unwind-tables) \
	$(call cc-option, -fno-stack-protector)
	aflags-vdso := $(ccflags-vdso) \
	-D__ASSEMBLY__ -Wa,-gdwarf-2

	ifneq ($(c-gettimeofday-y),)
	CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)

	# config-n32-o32-env.c prepares the environment to build a 32bit vDSO
	# library on a 64bit kernel.
	# Note: Needs to be included before than the generic library.
	CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
	CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
	endif

	CFLAGS_REMOVE_vgettimeofday.o = -pg

	DISABLE_VDSO := n

	#
	# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
	# the base address of VDSO, the linker will emit a R_MIPS_PC32
	# relocation in binutils > 2.25 but it will fail with older versions
	# because that relocation is not supported for that symbol. As a result
	# of which we are forced to disable the VDSO symbols when building
	# with < 2.25 binutils on pre-R6 kernels. For more references on why we
	# can't use other methods to get the base address of VDSO please refer to
	# the comments on that file.
	#
	ifndef CONFIG_CPU_MIPSR6
	ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
	$(warning MIPS VDSO requires binutils >= 2.25)
	DISABLE_VDSO := y
	endif
	endif

	#
	# GCC (at least up to version 9.2) appears to emit function calls that make use
	# of the GOT when targeting microMIPS, which we can't use in the VDSO due to
	# the lack of relocations. As such, we disable the VDSO for microMIPS builds.
	#
	ifdef CONFIG_CPU_MICROMIPS
	DISABLE_VDSO := y
	endif

	ifeq ($(DISABLE_VDSO),y)
	obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
	ccflags-vdso += -DDISABLE_MIPS_VDSO
	endif

	# VDSO linker flags.
	VDSO_LDFLAGS := \
	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
	$(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
	-nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id

	CFLAGS_REMOVE_vdso.o = -pg

	GCOV_PROFILE := n
	UBSAN_SANITIZE := n
	KCOV_INSTRUMENT := n

	# Check that we don't have PIC 'jalr t9' calls left
	quiet_cmd_vdso_mips_check = VDSOCHK $@
	cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ \| egrep -h "jalr.*t9" > /dev/null; \
	then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
	rm -f $@; /bin/false); fi

	#
	# Shared build commands.
	#

	quiet_cmd_vdsold_and_vdso_check = LD $@
	cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check); $(cmd_vdso_mips_check)

	quiet_cmd_vdsold = VDSO $@
	cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
	-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@

	quiet_cmd_vdsoas_o_S = AS $@
	cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<

	# Strip rule for the raw .so files
	$(obj)/%.so.raw: OBJCOPYFLAGS := -S
	$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
	$(call if_changed,objcopy)

	hostprogs := genvdso

	quiet_cmd_genvdso = GENVDSO $@
	define cmd_genvdso
	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
	endef

	#
	# Build native VDSO.
	#

	native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))

	targets += $(obj-vdso-y)
	targets += vdso.lds
	targets += vdso.so.dbg.raw vdso.so.raw
	targets += vdso.so.dbg vdso.so
	targets += vdso-image.c

	obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)

	$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
	$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)

	$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)

	$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
	$(call if_changed,vdsold_and_vdso_check)

	$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
	$(obj)/genvdso FORCE
	$(call if_changed,genvdso)

	obj-y += vdso-image.o

	#
	# Build O32 VDSO.
	#

	# Define these outside the ifdef to ensure they are picked up by clean.
	targets += $(obj-vdso-y:%.o=%-o32.o)
	targets += vdso-o32.lds
	targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
	targets += vdso-o32.so.dbg vdso-o32.so
	targets += vdso-o32-image.c

	ifdef CONFIG_MIPS32_O32

	obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)

	$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
	$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32

	$(obj)/%-o32.o: $(src)/%.S FORCE
	$(call if_changed_dep,vdsoas_o_S)

	$(obj)/%-o32.o: $(src)/%.c FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)

	$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
	$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
	$(call if_changed_dep,cpp_lds_S)

	$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
	$(call if_changed,vdsold_and_vdso_check)

	$(obj)/vdso-o32-image.c: VDSO_NAME := o32
	$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
	$(obj)/genvdso FORCE
	$(call if_changed,genvdso)

	obj-y += vdso-o32-image.o

	endif

	#
	# Build N32 VDSO.
	#

	targets += $(obj-vdso-y:%.o=%-n32.o)
	targets += vdso-n32.lds
	targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
	targets += vdso-n32.so.dbg vdso-n32.so
	targets += vdso-n32-image.c

	ifdef CONFIG_MIPS32_N32

	obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)

	$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
	$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32

	$(obj)/%-n32.o: $(src)/%.S FORCE
	$(call if_changed_dep,vdsoas_o_S)

	$(obj)/%-n32.o: $(src)/%.c FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)

	$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
	$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
	$(call if_changed_dep,cpp_lds_S)

	$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
	$(call if_changed,vdsold_and_vdso_check)

	$(obj)/vdso-n32-image.c: VDSO_NAME := n32
	$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
	$(obj)/genvdso FORCE
	$(call if_changed,genvdso)

	obj-y += vdso-n32-image.o

	endif

	# FIXME: Need install rule for debug.
	# Needs to deal with dependency for generation of dbg by cmd_genvdso...