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208 lines
6.0 KiB
208 lines
6.0 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# Objects to go into the VDSO. |
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# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before |
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# the inclusion of generic Makefile. |
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ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT |
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include $(srctree)/lib/vdso/Makefile |
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obj-vdso-y := elf.o vgettimeofday.o sigreturn.o |
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# Common compiler flags between ABIs. |
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ccflags-vdso := \ |
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$(filter -I%,$(KBUILD_CFLAGS)) \ |
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$(filter -E%,$(KBUILD_CFLAGS)) \ |
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$(filter -mmicromips,$(KBUILD_CFLAGS)) \ |
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$(filter -march=%,$(KBUILD_CFLAGS)) \ |
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$(filter -m%-float,$(KBUILD_CFLAGS)) \ |
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$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ |
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$(CLANG_FLAGS) \ |
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-D__VDSO__ |
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ifndef CONFIG_64BIT |
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ccflags-vdso += -DBUILD_VDSO32 |
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endif |
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# |
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# The -fno-jump-tables flag only prevents the compiler from generating |
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# jump tables but does not prevent the compiler from emitting absolute |
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# offsets. |
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cflags-vdso := $(ccflags-vdso) \ |
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$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ |
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-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ |
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-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \ |
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-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ |
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$(call cc-option, -fno-asynchronous-unwind-tables) |
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aflags-vdso := $(ccflags-vdso) \ |
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-D__ASSEMBLY__ -Wa,-gdwarf-2 |
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ifneq ($(c-gettimeofday-y),) |
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CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y) |
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# config-n32-o32-env.c prepares the environment to build a 32bit vDSO |
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# library on a 64bit kernel. |
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# Note: Needs to be included before than the generic library. |
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CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) |
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CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) |
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endif |
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CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) |
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ifdef CONFIG_MIPS_DISABLE_VDSO |
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ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO |
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$(warning MIPS VDSO requires binutils >= 2.25) |
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endif |
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obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) |
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endif |
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# VDSO linker flags. |
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ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ |
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$(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ |
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-G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T |
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CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) |
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GCOV_PROFILE := n |
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UBSAN_SANITIZE := n |
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KCOV_INSTRUMENT := n |
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# Check that we don't have PIC 'jalr t9' calls left |
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quiet_cmd_vdso_mips_check = VDSOCHK $@ |
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cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \ |
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then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \ |
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rm -f $@; /bin/false); fi |
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# |
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# Shared build commands. |
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# |
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quiet_cmd_vdsold_and_vdso_check = LD $@ |
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cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check) |
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quiet_cmd_vdsoas_o_S = AS $@ |
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cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< |
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# Strip rule for the raw .so files |
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$(obj)/%.so.raw: OBJCOPYFLAGS := -S |
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$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE |
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$(call if_changed,objcopy) |
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hostprogs := genvdso |
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quiet_cmd_genvdso = GENVDSO $@ |
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define cmd_genvdso |
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$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ |
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$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) |
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endef |
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# |
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# Build native VDSO. |
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# |
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native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) |
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targets += $(obj-vdso-y) |
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targets += vdso.lds |
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targets += vdso.so.dbg.raw vdso.so.raw |
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targets += vdso.so.dbg vdso.so |
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targets += vdso-image.c |
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obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) |
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$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) |
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$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) |
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$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) |
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$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE |
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$(call if_changed,vdsold_and_vdso_check) |
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$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ |
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$(obj)/genvdso FORCE |
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$(call if_changed,genvdso) |
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obj-y += vdso-image.o |
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# |
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# Build O32 VDSO. |
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# |
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# Define these outside the ifdef to ensure they are picked up by clean. |
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targets += $(obj-vdso-y:%.o=%-o32.o) |
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targets += vdso-o32.lds |
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targets += vdso-o32.so.dbg.raw vdso-o32.so.raw |
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targets += vdso-o32.so.dbg vdso-o32.so |
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targets += vdso-o32-image.c |
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ifdef CONFIG_MIPS32_O32 |
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obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) |
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$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 |
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$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 |
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$(obj)/%-o32.o: $(src)/%.S FORCE |
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$(call if_changed_dep,vdsoas_o_S) |
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$(obj)/%-o32.o: $(src)/%.c FORCE |
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$(call cmd,force_checksrc) |
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$(call if_changed_rule,cc_o_c) |
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$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 |
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$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE |
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$(call if_changed_dep,cpp_lds_S) |
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$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE |
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$(call if_changed,vdsold_and_vdso_check) |
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$(obj)/vdso-o32-image.c: VDSO_NAME := o32 |
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$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ |
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$(obj)/genvdso FORCE |
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$(call if_changed,genvdso) |
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obj-y += vdso-o32-image.o |
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endif |
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# |
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# Build N32 VDSO. |
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# |
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targets += $(obj-vdso-y:%.o=%-n32.o) |
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targets += vdso-n32.lds |
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targets += vdso-n32.so.dbg.raw vdso-n32.so.raw |
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targets += vdso-n32.so.dbg vdso-n32.so |
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targets += vdso-n32-image.c |
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ifdef CONFIG_MIPS32_N32 |
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obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) |
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$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 |
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$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 |
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$(obj)/%-n32.o: $(src)/%.S FORCE |
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$(call if_changed_dep,vdsoas_o_S) |
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$(obj)/%-n32.o: $(src)/%.c FORCE |
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$(call cmd,force_checksrc) |
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$(call if_changed_rule,cc_o_c) |
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$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 |
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$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE |
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$(call if_changed_dep,cpp_lds_S) |
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$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE |
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$(call if_changed,vdsold_and_vdso_check) |
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$(obj)/vdso-n32-image.c: VDSO_NAME := n32 |
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$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ |
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$(obj)/genvdso FORCE |
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$(call if_changed,genvdso) |
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obj-y += vdso-n32-image.o |
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endif |
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# FIXME: Need install rule for debug. |
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# Needs to deal with dependency for generation of dbg by cmd_genvdso...
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