1# 2# Building vDSO images for x86. 3# 4 5# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 6KCOV_INSTRUMENT := n 7 8VDSO64-y := y 9 10vdso-install-$(VDSO64-y) += vdso.so 11 12 13# files to link into the vdso 14vobjs-y := vdso-note.o um_vdso.o 15 16# files to link into kernel 17obj-$(VDSO64-y) += vdso.o vma.o 18 19vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 20 21$(obj)/vdso.o: $(obj)/vdso.so 22 23targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) 24 25export CPPFLAGS_vdso.lds += -P -C 26 27VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 28 -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 29 30$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so 31 32$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE 33 $(call if_changed,vdso) 34 35$(obj)/%.so: OBJCOPYFLAGS := -S 36$(obj)/%.so: $(obj)/%.so.dbg FORCE 37 $(call if_changed,objcopy) 38 39# 40# Don't omit frame pointers for ease of userspace debugging, but do 41# optimize sibling calls. 42# 43CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 44 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ 45 -fno-omit-frame-pointer -foptimize-sibling-calls 46 47$(vobjs): KBUILD_CFLAGS += $(CFL) 48 49# 50# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 51# 52CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage 53CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage 54 55targets += vdso-syms.lds 56obj-$(VDSO64-y) += vdso-syms.lds 57 58# 59# Match symbols in the DSO that look like VDSO*; produce a file of constants. 60# 61sed-vdsosym := -e 's/^00*/0/' \ 62 -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' 63quiet_cmd_vdsosym = VDSOSYM $@ 64define cmd_vdsosym 65 $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ 66endef 67 68$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE 69 $(call if_changed,vdsosym) 70 71# 72# The DSO images are built using a special linker script. 73# 74quiet_cmd_vdso = VDSO $@ 75 cmd_vdso = $(CC) -nostdlib -o $@ \ 76 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 77 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ 78 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' 79 80VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) 81GCOV_PROFILE := n 82 83# 84# Install the unstripped copy of vdso*.so listed in $(vdso-install-y). 85# 86quiet_cmd_vdso_install = INSTALL $@ 87 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 88$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE 89 @mkdir -p $(MODLIB)/vdso 90 $(call cmd,vdso_install) 91 92PHONY += vdso_install $(vdso-install-y) 93vdso_install: $(vdso-install-y) 94