1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 25c48b108SAl Viro# 35c48b108SAl Viro# Building vDSO images for x86. 45c48b108SAl Viro# 55c48b108SAl Viro 6915eed20SVegard Nossum# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 7915eed20SVegard NossumKCOV_INSTRUMENT := n 8915eed20SVegard Nossum 95c48b108SAl ViroVDSO64-y := y 105c48b108SAl Viro 115c48b108SAl Virovdso-install-$(VDSO64-y) += vdso.so 125c48b108SAl Viro 135c48b108SAl Viro 145c48b108SAl Viro# files to link into the vdso 155c48b108SAl Virovobjs-y := vdso-note.o um_vdso.o 165c48b108SAl Viro 175c48b108SAl Viro# files to link into kernel 185c48b108SAl Viroobj-$(VDSO64-y) += vdso.o vma.o 195c48b108SAl Viro 205c48b108SAl Virovobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 215c48b108SAl Viro 225c48b108SAl Viro$(obj)/vdso.o: $(obj)/vdso.so 235c48b108SAl Viro 245c48b108SAl Virotargets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) 255c48b108SAl Viro 2661615fafSMasahiro YamadaCPPFLAGS_vdso.lds += -P -C 275c48b108SAl Viro 285c48b108SAl ViroVDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 29e4f752ddSNick Desaulniers -Wl,-z,max-page-size=4096 305c48b108SAl Viro 315c48b108SAl Viro$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so 325c48b108SAl Viro 331742ed20SMasahiro Yamada$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 345c48b108SAl Viro $(call if_changed,vdso) 355c48b108SAl Viro 365c48b108SAl Viro$(obj)/%.so: OBJCOPYFLAGS := -S 375c48b108SAl Viro$(obj)/%.so: $(obj)/%.so.dbg FORCE 385c48b108SAl Viro $(call if_changed,objcopy) 395c48b108SAl Viro 405c48b108SAl Viro# 415c48b108SAl Viro# Don't omit frame pointers for ease of userspace debugging, but do 425c48b108SAl Viro# optimize sibling calls. 435c48b108SAl Viro# 445c48b108SAl ViroCFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 45*893ab004SMasahiro Yamada $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 465c48b108SAl Viro -fno-omit-frame-pointer -foptimize-sibling-calls 475c48b108SAl Viro 485c48b108SAl Viro$(vobjs): KBUILD_CFLAGS += $(CFL) 495c48b108SAl Viro 505c48b108SAl Viro# 515c48b108SAl Viro# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 525c48b108SAl Viro# 534d211093SAl ViroCFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage 544d211093SAl ViroCFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage 555c48b108SAl Viro 565c48b108SAl Viro# 575c48b108SAl Viro# The DSO images are built using a special linker script. 585c48b108SAl Viro# 595c48b108SAl Viroquiet_cmd_vdso = VDSO $@ 605c48b108SAl Viro cmd_vdso = $(CC) -nostdlib -o $@ \ 615c48b108SAl Viro $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 625c48b108SAl Viro -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ 635c48b108SAl Viro sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' 645c48b108SAl Viro 653855f11dSNick DesaulniersVDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv 665c48b108SAl ViroGCOV_PROFILE := n 675c48b108SAl Viro 685c48b108SAl Viro# 695c48b108SAl Viro# Install the unstripped copy of vdso*.so listed in $(vdso-install-y). 705c48b108SAl Viro# 715c48b108SAl Viroquiet_cmd_vdso_install = INSTALL $@ 725c48b108SAl Viro cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 735c48b108SAl Viro$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE 745c48b108SAl Viro @mkdir -p $(MODLIB)/vdso 755c48b108SAl Viro $(call cmd,vdso_install) 765c48b108SAl Viro 775c48b108SAl ViroPHONY += vdso_install $(vdso-install-y) 785c48b108SAl Virovdso_install: $(vdso-install-y) 79