90 lines
2.8 KiB
Makefile
90 lines
2.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Building vDSO images for x86.
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#
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# Include the generic Makefile to check the built vDSO:
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include $(srctree)/lib/vdso/Makefile.include
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obj-y += $(foreach x,$(vdsos-y),vdso$(x)-image.o)
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targets += $(foreach x,$(vdsos-y),vdso$(x)-image.c vdso$(x).so vdso$(x).so.dbg vdso$(x).lds)
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targets += $(vobjs-y)
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# vobjs-y with $(obj)/ prepended
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vobjs := $(addprefix $(obj)/,$(vobjs-y))
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# Options for vdso*.lds
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CPPFLAGS_VDSO_LDS := -P -C -I$(src)/..
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$(obj)/%.lds : KBUILD_CPPFLAGS += $(CPPFLAGS_VDSO_LDS)
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#
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# Options from KBUILD_[AC]FLAGS that should *NOT* be kept
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#
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flags-remove-y += \
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-D__KERNEL__ -mcmodel=kernel -mregparm=3 \
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-fno-pic -fno-PIC -fno-pie -fno-PIE \
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-mfentry -pg \
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$(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(KSTACK_ERASE_CFLAGS) \
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$(RETPOLINE_CFLAGS) $(CC_FLAGS_LTO) $(CC_FLAGS_CFI) \
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$(PADDING_CFLAGS)
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#
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# Don't omit frame pointers for ease of userspace debugging, but do
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# optimize sibling calls.
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#
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flags-y += -D__DISABLE_EXPORTS
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flags-y += -DDISABLE_BRANCH_PROFILING
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flags-y += -DBUILD_VDSO
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flags-y += -I$(src)/.. -I$(srctree)
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flags-y += -O2 -fpic
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flags-y += -fno-stack-protector
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flags-y += -fno-omit-frame-pointer
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flags-y += -foptimize-sibling-calls
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flags-y += -fasynchronous-unwind-tables
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# Reset cf protections enabled by compiler default
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flags-y += $(call cc-option, -fcf-protection=none)
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flags-$(X86_USER_SHADOW_STACK) += $(call cc-option, -fcf-protection=return)
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# When user space IBT is supported, enable this.
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# flags-$(CONFIG_USER_IBT) += $(call cc-option, -fcf-protection=branch)
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flags-$(CONFIG_MITIGATION_RETPOLINE) += $(RETPOLINE_VDSO_CFLAGS)
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# These need to be conditional on $(vobjs) as they do not apply to
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# the output vdso*-image.o files which are standard kernel objects.
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$(vobjs) : KBUILD_AFLAGS := \
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$(filter-out $(flags-remove-y),$(KBUILD_AFLAGS)) $(flags-y)
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$(vobjs) : KBUILD_CFLAGS := \
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$(filter-out $(flags-remove-y),$(KBUILD_CFLAGS)) $(flags-y)
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#
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# The VDSO images are built using a special linker script.
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#
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VDSO_LDFLAGS := -shared --hash-style=both --build-id=sha1 --no-undefined \
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$(call ld-option, --eh-frame-hdr) -Bsymbolic -z noexecstack
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quiet_cmd_vdso = VDSO $@
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cmd_vdso = $(LD) -o $@ \
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$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$*) \
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-T $(filter %.lds,$^) $(filter %.o,$^)
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quiet_cmd_vdso_and_check = VDSO $@
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cmd_vdso_and_check = $(cmd_vdso); $(cmd_vdso_check)
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$(obj)/vdso%.so.dbg: $(obj)/vdso%.lds FORCE
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$(call if_changed,vdso_and_check)
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$(obj)/%.so: OBJCOPYFLAGS := -S --remove-section __ex_table
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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VDSO2C = $(objtree)/arch/x86/tools/vdso2c
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quiet_cmd_vdso2c = VDSO2C $@
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cmd_vdso2c = $(VDSO2C) $< $(<:%.dbg=%) $@
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$(obj)/%-image.c: $(obj)/%.so.dbg $(obj)/%.so $(VDSO2C) FORCE
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$(call if_changed,vdso2c)
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$(obj)/%-image.o: $(obj)/%-image.c
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