1 # SPDX-License-Identifier: GPL-2.0 2 # 3 # Building vDSO images for x86. 4 # 5 6 VDSO64-y := y 7 8 vdso-install-$(VDSO64-y) += vdso.so 9 10 11 # files to link into the vdso 12 vobjs-y := vdso-note.o um_vdso.o 13 14 # files to link into kernel 15 obj-$(VDSO64-y) += vdso.o vma.o 16 17 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 18 19 $(obj)/vdso.o: $(obj)/vdso.so 20 21 targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) 22 23 CPPFLAGS_vdso.lds += -P -C 24 25 VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 26 -Wl,-z,max-page-size=4096 27 28 $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so 29 30 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 31 $(call if_changed,vdso) 32 33 $(obj)/%.so: OBJCOPYFLAGS := -S 34 $(obj)/%.so: $(obj)/%.so.dbg FORCE 35 $(call if_changed,objcopy) 36 37 # 38 # Don't omit frame pointers for ease of userspace debugging, but do 39 # optimize sibling calls. 40 # 41 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 42 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 43 -fno-omit-frame-pointer -foptimize-sibling-calls 44 45 $(vobjs): KBUILD_CFLAGS += $(CFL) 46 47 # 48 # vDSO code runs in userspace and -pg doesn't help with profiling anyway. 49 # 50 CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage 51 CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage 52 53 # 54 # The DSO images are built using a special linker script. 55 # 56 quiet_cmd_vdso = VDSO $@ 57 cmd_vdso = $(CC) -nostdlib -o $@ \ 58 $(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 59 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ 60 sh $(src)/checkundef.sh '$(NM)' '$@' 61 62 VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
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