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78 lines
2.3 KiB
78 lines
2.3 KiB
hostprogs-y := vdsomunge |
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obj-vdso := vgettimeofday.o datapage.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 |
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VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 |
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VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 |
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VDSO_LDFLAGS += -nostdlib -shared |
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VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
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VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id) |
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VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd) |
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obj-$(CONFIG_VDSO) += vdso.o |
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extra-$(CONFIG_VDSO) += vdso.lds |
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CPPFLAGS_vdso.lds += -P -C -U$(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 |
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CFLAGS_vgettimeofday.o = -O2 |
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# Disable gcov profiling for VDSO code |
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GCOV_PROFILE := 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: $(src)/vdso.lds $(obj-vdso) FORCE |
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$(call if_changed,vdsold) |
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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 = VDSO $@ |
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cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ |
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-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ |
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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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