linux-yocto/arch/mips/vdso/Makefile

SPDX-License-Identifier: GPL-2.0

Objects to go into the VDSO.

Include the generic Makefile to check the built vdso.

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))
$(CLANG_FLAGS)
-D__VDSO__

ifndef CONFIG_64BIT ccflags-vdso += -DBUILD_VDSO32 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) 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 $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) CFLAGS_vgettimeofday-n32.o = -include $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) endif

CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)

ifdef CONFIG_MIPS_DISABLE_VDSO obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) endif

VDSO linker flags.

ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1
$(filter -E%,$(KBUILD_CFLAGS)) -shared
-G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T

CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)

Check that we don't have PIC 'jalr t9' calls left

quiet_cmd_vdso_mips_check = VDSOCHK $@ cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null;
then (echo >&2 "$@: 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_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)

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...