| # SPDX-License-Identifier: GPL-2.0 |
| hostprogs-y := vdsomunge |
| |
| obj-vdso := vgettimeofday.o datapage.o |
| |
| # Build rules |
| targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds |
| obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
| |
| ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector |
| ccflags-y += -DDISABLE_BRANCH_PROFILING |
| |
| VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 |
| VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 |
| VDSO_LDFLAGS += -nostdlib -shared |
| VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
| VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id) |
| VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd) |
| |
| obj-$(CONFIG_VDSO) += vdso.o |
| extra-$(CONFIG_VDSO) += vdso.lds |
| CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
| |
| CFLAGS_REMOVE_vdso.o = -pg |
| |
| # Force -O2 to avoid libgcc dependencies |
| CFLAGS_REMOVE_vgettimeofday.o = -pg -Os |
| CFLAGS_vgettimeofday.o = -O2 |
| |
| # Disable gcov profiling for VDSO code |
| GCOV_PROFILE := n |
| |
| # Force dependency |
| $(obj)/vdso.o : $(obj)/vdso.so |
| |
| # Link rule for the .so file |
| $(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE |
| $(call if_changed,vdsold) |
| |
| $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE |
| $(call if_changed,vdsomunge) |
| |
| # Strip rule for the .so file |
| $(obj)/%.so: OBJCOPYFLAGS := -S |
| $(obj)/%.so: $(obj)/%.so.dbg FORCE |
| $(call if_changed,objcopy) |
| |
| # Actual build commands |
| quiet_cmd_vdsold = VDSO $@ |
| cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ |
| -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ |
| |
| quiet_cmd_vdsomunge = MUNGE $@ |
| cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@ |
| |
| # |
| # Install the unstripped copy of vdso.so.dbg. If our toolchain |
| # supports build-id, install .build-id links as well. |
| # |
| # Cribbed from arch/x86/vdso/Makefile. |
| # |
| quiet_cmd_vdso_install = INSTALL $< |
| define cmd_vdso_install |
| cp $< "$(MODLIB)/vdso/vdso.so"; \ |
| if readelf -n $< | grep -q 'Build ID'; then \ |
| buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ |
| first=`echo $$buildid | cut -b-2`; \ |
| last=`echo $$buildid | cut -b3-`; \ |
| mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ |
| ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ |
| fi |
| endef |
| |
| $(MODLIB)/vdso: FORCE |
| @mkdir -p $(MODLIB)/vdso |
| |
| PHONY += vdso_install |
| vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso |
| $(call cmd,vdso_install) |