1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 25c48b108SAl Viro# 35c48b108SAl Viro# Building vDSO images for x86. 45c48b108SAl Viro# 55c48b108SAl Viro 65c48b108SAl ViroVDSO64-y := y 75c48b108SAl Viro 85c48b108SAl Virovdso-install-$(VDSO64-y) += vdso.so 95c48b108SAl Viro 105c48b108SAl Viro 115c48b108SAl Viro# files to link into the vdso 125c48b108SAl Virovobjs-y := vdso-note.o um_vdso.o 135c48b108SAl Viro 145c48b108SAl Viro# files to link into kernel 155c48b108SAl Viroobj-$(VDSO64-y) += vdso.o vma.o 165c48b108SAl Viro 175c48b108SAl Virovobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 185c48b108SAl Viro 195c48b108SAl Viro$(obj)/vdso.o: $(obj)/vdso.so 205c48b108SAl Viro 215c48b108SAl Virotargets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) 225c48b108SAl Viro 2361615fafSMasahiro YamadaCPPFLAGS_vdso.lds += -P -C 245c48b108SAl Viro 255c48b108SAl ViroVDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 26e4f752ddSNick Desaulniers -Wl,-z,max-page-size=4096 275c48b108SAl Viro 285c48b108SAl Viro$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so 295c48b108SAl Viro 301742ed20SMasahiro Yamada$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 315c48b108SAl Viro $(call if_changed,vdso) 325c48b108SAl Viro 335c48b108SAl Viro$(obj)/%.so: OBJCOPYFLAGS := -S 345c48b108SAl Viro$(obj)/%.so: $(obj)/%.so.dbg FORCE 355c48b108SAl Viro $(call if_changed,objcopy) 365c48b108SAl Viro 375c48b108SAl Viro# 385c48b108SAl Viro# Don't omit frame pointers for ease of userspace debugging, but do 395c48b108SAl Viro# optimize sibling calls. 405c48b108SAl Viro# 415c48b108SAl ViroCFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 42893ab004SMasahiro Yamada $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 435c48b108SAl Viro -fno-omit-frame-pointer -foptimize-sibling-calls 445c48b108SAl Viro 455c48b108SAl Viro$(vobjs): KBUILD_CFLAGS += $(CFL) 465c48b108SAl Viro 475c48b108SAl Viro# 485c48b108SAl Viro# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 495c48b108SAl Viro# 504d211093SAl ViroCFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage 514d211093SAl ViroCFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage 525c48b108SAl Viro 535c48b108SAl Viro# 545c48b108SAl Viro# The DSO images are built using a special linker script. 555c48b108SAl Viro# 565c48b108SAl Viroquiet_cmd_vdso = VDSO $@ 575c48b108SAl Viro cmd_vdso = $(CC) -nostdlib -o $@ \ 5883e913f5SPeter Foley $(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 59*90daca7cSThomas Weißschuh -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) 605c48b108SAl Viro 61*90daca7cSThomas WeißschuhVDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack -Wl,--no-undefined 62