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97 lines
2.7 KiB
97 lines
2.7 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_LARCH_32|R_LARCH_64|R_LARCH_MARK_LA|R_LARCH_JUMP_SLOT |
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include $(srctree)/lib/vdso/Makefile |
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obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o |
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# Common compiler flags between ABIs. |
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ccflags-vdso := \ |
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$(filter -I%,$(KBUILD_CFLAGS)) \ |
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$(filter -E%,$(KBUILD_CFLAGS)) \ |
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$(filter -march=%,$(KBUILD_CFLAGS)) \ |
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$(filter -m%-float,$(KBUILD_CFLAGS)) \ |
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-D__VDSO__ |
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ifeq ($(cc-name),clang) |
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ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) |
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endif |
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cflags-vdso := $(ccflags-vdso) \ |
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-isystem $(shell $(CC) -print-file-name=include) \ |
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$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ |
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-O2 -g -fno-strict-aliasing -fno-common -fno-builtin -G0 \ |
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-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ |
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$(call cc-option, -fno-asynchronous-unwind-tables) \ |
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$(call cc-option, -fno-stack-protector) |
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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 $(c-gettimeofday-y) |
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endif |
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# VDSO linker flags. |
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ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ |
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$(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ |
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--hash-style=sysv --build-id -T |
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GCOV_PROFILE := n |
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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) |
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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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# Generate VDSO offsets using helper script |
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gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh |
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quiet_cmd_vdsosym = VDSOSYM $@ |
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ |
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include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE |
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$(call if_changed,vdsosym) |
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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 vdso.so.dbg vdso.so |
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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: $(obj)/vdso.lds $(obj-vdso) FORCE |
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$(call if_changed,vdsold_and_vdso_check) |
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$(obj)/vdso.so: OBJCOPYFLAGS := -S |
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$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE |
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$(call if_changed,objcopy) |
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obj-y += vdso.o |
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$(obj)/vdso.o : $(obj)/vdso.so |
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# install commands for the unstripped file |
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quiet_cmd_vdso_install = INSTALL $@ |
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
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vdso.so: $(obj)/vdso.so.dbg |
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@mkdir -p $(MODLIB)/vdso |
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$(call cmd,vdso_install) |
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vdso_install: vdso.so
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