93 lines
2.6 KiB
Makefile
93 lines
2.6 KiB
Makefile
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# SPDX-License-Identifier: GPL-2.0
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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_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
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include $(srctree)/lib/vdso/Makefile
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hostprogs := vdsomunge
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obj-vdso := vgettimeofday.o datapage.o note.o
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# Build rules
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targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
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ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
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ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
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ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
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-z max-page-size=4096 -shared $(ldflags-y) \
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--hash-style=sysv --build-id=sha1 \
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-T
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obj-$(CONFIG_VDSO) += vdso.o
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
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CFLAGS_REMOVE_vdso.o = -pg
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# Force -O2 to avoid libgcc dependencies
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CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
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ifeq ($(c-gettimeofday-y),)
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CFLAGS_vgettimeofday.o = -O2
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else
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CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
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endif
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# Disable gcov profiling for VDSO code
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GCOV_PROFILE := n
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UBSAN_SANITIZE := n
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# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
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KCOV_INSTRUMENT := n
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KASAN_SANITIZE := n
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# Force dependency
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$(obj)/vdso.o : $(obj)/vdso.so
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# Link rule for the .so file
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$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
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$(call if_changed,vdsold_and_vdso_check)
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$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
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$(call if_changed,vdsomunge)
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# Strip rule for the .so file
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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# Actual build commands
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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_vdsomunge = MUNGE $@
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cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
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#
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# Install the unstripped copy of vdso.so.dbg. If our toolchain
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# supports build-id, install .build-id links as well.
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#
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# Cribbed from arch/x86/vdso/Makefile.
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#
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quiet_cmd_vdso_install = INSTALL $<
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define cmd_vdso_install
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cp $< "$(MODLIB)/vdso/vdso.so"; \
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if readelf -n $< | grep -q 'Build ID'; then \
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buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
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first=`echo $$buildid | cut -b-2`; \
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last=`echo $$buildid | cut -b3-`; \
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mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
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ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
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fi
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endef
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$(MODLIB)/vdso: FORCE
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@mkdir -p $(MODLIB)/vdso
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PHONY += vdso_install
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vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
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$(call cmd,vdso_install)
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