1# SPDX-License-Identifier: GPL-2.0 2# List of files in the vdso, has to be asm only for now 3 4KCOV_INSTRUMENT := n 5 6obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o 7 8# Build rules 9 10targets := $(obj-vdso64) vdso64.so vdso64.so.dbg 11obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 12 13KBUILD_AFLAGS += -DBUILD_VDSO 14KBUILD_CFLAGS += -DBUILD_VDSO 15 16KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 17KBUILD_AFLAGS_64 += -m64 -s 18 19KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 20KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin 21ldflags-y := -fPIC -shared -nostdlib -soname=linux-vdso64.so.1 \ 22 --hash-style=both --build-id -T 23 24$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) 25$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) 26 27obj-y += vdso64_wrapper.o 28extra-y += vdso64.lds 29CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 30 31# Disable gcov profiling, ubsan and kasan for VDSO code 32GCOV_PROFILE := n 33UBSAN_SANITIZE := n 34KASAN_SANITIZE := n 35 36# Force dependency (incbin is bad) 37$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 38 39# link rule for the .so file, .lds has to be first 40$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) FORCE 41 $(call if_changed,ld) 42 43# strip rule for the .so file 44$(obj)/%.so: OBJCOPYFLAGS := -S 45$(obj)/%.so: $(obj)/%.so.dbg FORCE 46 $(call if_changed,objcopy) 47 48# assembly rules for the .S files 49$(obj-vdso64): %.o: %.S FORCE 50 $(call if_changed_dep,vdso64as) 51 52# actual build commands 53quiet_cmd_vdso64as = VDSO64A $@ 54 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 55 56# install commands for the unstripped file 57quiet_cmd_vdso_install = INSTALL $@ 58 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 59 60vdso64.so: $(obj)/vdso64.so.dbg 61 @mkdir -p $(MODLIB)/vdso 62 $(call cmd,vdso_install) 63 64vdso_install: vdso64.so 65