arch/x86/entry/vdso/Makefile - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 # SPDX-License-Identifier: GPL-2.0
 #
 # Building vDSO images for x86.
 #

 KBUILD_CFLAGS += $(DISABLE_LTO)
 KASAN_SANITIZE			:= n
 UBSAN_SANITIZE			:= n
 OBJECT_FILES_NON_STANDARD	:= y

 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
 KCOV_INSTRUMENT		:= n

 VDSO64-$(CONFIG_X86_64)		:= y
 VDSOX32-$(CONFIG_X86_X32_ABI)	:= y
 VDSO32-$(CONFIG_X86_32)		:= y
 VDSO32-$(CONFIG_IA32_EMULATION)	:= y

 # files to link into the vdso
 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o

 # files to link into kernel
 obj-y				+= vma.o
 OBJECT_FILES_NON_STANDARD_vma.o	:= n

 # vDSO images to build
 vdso_img-$(VDSO64-y)		+= 64
 vdso_img-$(VDSOX32-y)		+= x32
 vdso_img-$(VDSO32-y)		+= 32

 obj-$(VDSO32-y)			+= vdso32-setup.o

 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)

 $(obj)/vdso.o: $(obj)/vdso.so

 targets += vdso.lds $(vobjs-y)

 # Build the vDSO image C files and link them in.
 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
 obj-y += $(vdso_img_objs)
 targets += $(vdso_img_cfiles)
 targets += $(vdso_img_sodbg)
 .SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
 	$(vdso_img-y:%=$(obj)/vdso%.so)

 export CPPFLAGS_vdso.lds += -P -C

 VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -soname linux-vdso.so.1 --no-undefined \
 			-z max-page-size=4096

 $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
 	$(call if_changed,vdso)

 HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/$(SUBARCH)/include/uapi
 hostprogs-y			+= vdso2c

 quiet_cmd_vdso2c = VDSO2C  $@
 define cmd_vdso2c
 	$(obj)/vdso2c $< $(<:%.dbg=%) $@
 endef

 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
 	$(call if_changed,vdso2c)

 #
 # Don't omit frame pointers for ease of userspace debugging, but do
 # optimize sibling calls.
 #
 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
        $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
        -fno-omit-frame-pointer -foptimize-sibling-calls \
        -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO

 ifdef CONFIG_RETPOLINE
 ifneq ($(RETPOLINE_VDSO_CFLAGS),)
   CFL += $(RETPOLINE_VDSO_CFLAGS)
 endif
 endif

 $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)

 #
 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
 #
 CFLAGS_REMOVE_vdso-note.o = -pg
 CFLAGS_REMOVE_vclock_gettime.o = -pg
 CFLAGS_REMOVE_vgetcpu.o = -pg
 CFLAGS_REMOVE_vvar.o = -pg

 #
 # X32 processes use x32 vDSO to access 64bit kernel data.
 #
 # Build x32 vDSO image:
 # 1. Compile x32 vDSO as 64bit.
 # 2. Convert object files to x32.
 # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
 # so that it can reach 64bit address space with 64bit pointers.
 #

 CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
 VDSO_LDFLAGS_vdsox32.lds = -m elf32_x86_64 -soname linux-vdso.so.1 \
 			   -z max-page-size=4096

 # 64-bit objects to re-brand as x32
 vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))

 # x32-rebranded versions
 vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)

 # same thing, but in the output directory
 vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)

 # Convert 64bit object file to x32 for x32 vDSO.
 quiet_cmd_x32 = X32     $@
       cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@

 $(obj)/%-x32.o: $(obj)/%.o FORCE
 	$(call if_changed,x32)

 targets += vdsox32.lds $(vobjx32s-y)

 $(obj)/%.so: OBJCOPYFLAGS := -S
 $(obj)/%.so: $(obj)/%.so.dbg
 	$(call if_changed,objcopy)

 $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
 	$(call if_changed,vdso)

 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -soname linux-gate.so.1

 # This makes sure the $(obj) subdirectory exists even though vdso32/
 # is not a kbuild sub-make subdirectory.
 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/

 targets += vdso32/vdso32.lds
 targets += vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o
 targets += vdso32/vclock_gettime.o

 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32

 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
 KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING

 ifdef CONFIG_RETPOLINE
 ifneq ($(RETPOLINE_VDSO_CFLAGS),)
   KBUILD_CFLAGS_32 += $(RETPOLINE_VDSO_CFLAGS)
 endif
 endif

 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)

 $(obj)/vdso32.so.dbg: FORCE \
 		      $(obj)/vdso32/vdso32.lds \
 		      $(obj)/vdso32/vclock_gettime.o \
 		      $(obj)/vdso32/note.o \
 		      $(obj)/vdso32/system_call.o \
 		      $(obj)/vdso32/sigreturn.o
 	$(call if_changed,vdso)

 #
 # The DSO images are built using a special linker script.
 #
 quiet_cmd_vdso = VDSO    $@
       cmd_vdso = $(LD) -nostdlib -o $@ \
 		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
 		       -T $(filter %.lds,$^) $(filter %.o,$^) && \
 		 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'

 VDSO_LDFLAGS = -shared $(call ld-option, --hash-style=both) \
 	$(call ld-option, --build-id) $(call ld-option, --eh-frame-hdr) \
 	-Bsymbolic -z noexecstack
 GCOV_PROFILE := n

 #
 # Install the unstripped copies of vdso*.so.  If our toolchain supports
 # build-id, install .build-id links as well.
 #
 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
 define cmd_vdso_install
 	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
 	if readelf -n $< |grep -q 'Build ID'; then \
 	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
 	  first=`echo $$buildid | cut -b-2`; \
 	  last=`echo $$buildid | cut -b3-`; \
 	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
 	  ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
 	fi
 endef

 vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)

 $(MODLIB)/vdso: FORCE
 	@mkdir -p $(MODLIB)/vdso

 $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso
 	$(call cmd,vdso_install)

 PHONY += vdso_install $(vdso_img_insttargets)
 vdso_install: $(vdso_img_insttargets)

 clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so*
	# SPDX-License-Identifier: GPL-2.0
	#
	# Building vDSO images for x86.
	#

	KBUILD_CFLAGS += $(DISABLE_LTO)
	KASAN_SANITIZE := n
	UBSAN_SANITIZE := n
	OBJECT_FILES_NON_STANDARD := y

	# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
	KCOV_INSTRUMENT := n

	VDSO64-$(CONFIG_X86_64) := y
	VDSOX32-$(CONFIG_X86_X32_ABI) := y
	VDSO32-$(CONFIG_X86_32) := y
	VDSO32-$(CONFIG_IA32_EMULATION) := y

	# files to link into the vdso
	vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o

	# files to link into kernel
	obj-y += vma.o
	OBJECT_FILES_NON_STANDARD_vma.o := n

	# vDSO images to build
	vdso_img-$(VDSO64-y) += 64
	vdso_img-$(VDSOX32-y) += x32
	vdso_img-$(VDSO32-y) += 32

	obj-$(VDSO32-y) += vdso32-setup.o

	vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)

	$(obj)/vdso.o: $(obj)/vdso.so

	targets += vdso.lds $(vobjs-y)

	# Build the vDSO image C files and link them in.
	vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
	vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
	vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
	obj-y += $(vdso_img_objs)
	targets += $(vdso_img_cfiles)
	targets += $(vdso_img_sodbg)
	.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
	$(vdso_img-y:%=$(obj)/vdso%.so)

	export CPPFLAGS_vdso.lds += -P -C

	VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -soname linux-vdso.so.1 --no-undefined \
	-z max-page-size=4096

	$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
	$(call if_changed,vdso)

	HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/$(SUBARCH)/include/uapi
	hostprogs-y += vdso2c

	quiet_cmd_vdso2c = VDSO2C $@
	define cmd_vdso2c
	$(obj)/vdso2c $< $(<:%.dbg=%) $@
	endef

	$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
	$(call if_changed,vdso2c)

	#
	# Don't omit frame pointers for ease of userspace debugging, but do
	# optimize sibling calls.
	#
	CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
	$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
	-fno-omit-frame-pointer -foptimize-sibling-calls \
	-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO

	ifdef CONFIG_RETPOLINE
	ifneq ($(RETPOLINE_VDSO_CFLAGS),)
	CFL += $(RETPOLINE_VDSO_CFLAGS)
	endif
	endif

	$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)

	#
	# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
	#
	CFLAGS_REMOVE_vdso-note.o = -pg
	CFLAGS_REMOVE_vclock_gettime.o = -pg
	CFLAGS_REMOVE_vgetcpu.o = -pg
	CFLAGS_REMOVE_vvar.o = -pg

	#
	# X32 processes use x32 vDSO to access 64bit kernel data.
	#
	# Build x32 vDSO image:
	# 1. Compile x32 vDSO as 64bit.
	# 2. Convert object files to x32.
	# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
	# so that it can reach 64bit address space with 64bit pointers.
	#

	CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
	VDSO_LDFLAGS_vdsox32.lds = -m elf32_x86_64 -soname linux-vdso.so.1 \
	-z max-page-size=4096

	# 64-bit objects to re-brand as x32
	vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))

	# x32-rebranded versions
	vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)

	# same thing, but in the output directory
	vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)

	# Convert 64bit object file to x32 for x32 vDSO.
	quiet_cmd_x32 = X32 $@
	cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@

	$(obj)/%-x32.o: $(obj)/%.o FORCE
	$(call if_changed,x32)

	targets += vdsox32.lds $(vobjx32s-y)

	$(obj)/%.so: OBJCOPYFLAGS := -S
	$(obj)/%.so: $(obj)/%.so.dbg
	$(call if_changed,objcopy)

	$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
	$(call if_changed,vdso)

	CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
	VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -soname linux-gate.so.1

	# This makes sure the $(obj) subdirectory exists even though vdso32/
	# is not a kbuild sub-make subdirectory.
	override obj-dirs = $(dir $(obj)) $(obj)/vdso32/

	targets += vdso32/vdso32.lds
	targets += vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o
	targets += vdso32/vclock_gettime.o

	KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
	$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
	$(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32

	KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
	KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
	KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
	KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
	KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
	KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32))
	KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
	KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
	KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
	KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
	KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING

	ifdef CONFIG_RETPOLINE
	ifneq ($(RETPOLINE_VDSO_CFLAGS),)
	KBUILD_CFLAGS_32 += $(RETPOLINE_VDSO_CFLAGS)
	endif
	endif

	$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)

	$(obj)/vdso32.so.dbg: FORCE \
	$(obj)/vdso32/vdso32.lds \
	$(obj)/vdso32/vclock_gettime.o \
	$(obj)/vdso32/note.o \
	$(obj)/vdso32/system_call.o \
	$(obj)/vdso32/sigreturn.o
	$(call if_changed,vdso)

	#
	# The DSO images are built using a special linker script.
	#
	quiet_cmd_vdso = VDSO $@
	cmd_vdso = $(LD) -nostdlib -o $@ \
	$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
	-T $(filter %.lds,$^) $(filter %.o,$^) && \
	sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'

	VDSO_LDFLAGS = -shared $(call ld-option, --hash-style=both) \
	$(call ld-option, --build-id) $(call ld-option, --eh-frame-hdr) \
	-Bsymbolic -z noexecstack
	GCOV_PROFILE := n

	#
	# Install the unstripped copies of vdso*.so. If our toolchain supports
	# build-id, install .build-id links as well.
	#
	quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
	define cmd_vdso_install
	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
	if readelf -n $< \|grep -q 'Build ID'; then \
	buildid=`readelf -n $< \|grep 'Build ID' \|sed -e 's/^.Build ID: \(.\)$$/\1/'`; \
	first=`echo $$buildid \| cut -b-2`; \
	last=`echo $$buildid \| cut -b3-`; \
	mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
	ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
	fi
	endef

	vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)

	$(MODLIB)/vdso: FORCE
	@mkdir -p $(MODLIB)/vdso

	$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso
	$(call cmd,vdso_install)

	PHONY += vdso_install $(vdso_img_insttargets)
	vdso_install: $(vdso_img_insttargets)

	clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-.c vdsox32.so