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-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o 7 8# Build rules 9 10targets := $(obj-vdso32) vdso32.so vdso32.so.dbg 11obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) 12 13KBUILD_AFLAGS_31 := $(filter-out -m64,$(KBUILD_AFLAGS)) 14KBUILD_AFLAGS_31 += -m31 -s 15 16KBUILD_CFLAGS_31 := $(filter-out -m64,$(KBUILD_CFLAGS)) 17KBUILD_CFLAGS_31 += -m31 -fPIC -shared -fno-common -fno-builtin 18KBUILD_CFLAGS_31 += -nostdlib -Wl,-soname=linux-vdso32.so.1 \ 19 $(call cc-ldoption, -Wl$(comma)--hash-style=both) 20 21$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_31) 22$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_31) 23 24obj-y += vdso32_wrapper.o 25extra-y += vdso32.lds 26CPPFLAGS_vdso32.lds += -P -C -U$(ARCH) 27 28# Disable gcov profiling and ubsan for VDSO code 29GCOV_PROFILE := n 30UBSAN_SANITIZE := n 31 32# Force dependency (incbin is bad) 33$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so 34 35# link rule for the .so file, .lds has to be first 36$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) 37 $(call if_changed,vdso32ld) 38 39# strip rule for the .so file 40$(obj)/%.so: OBJCOPYFLAGS := -S 41$(obj)/%.so: $(obj)/%.so.dbg FORCE 42 $(call if_changed,objcopy) 43 44# assembly rules for the .S files 45$(obj-vdso32): %.o: %.S 46 $(call if_changed_dep,vdso32as) 47 48# actual build commands 49quiet_cmd_vdso32ld = VDSO32L $@ 50 cmd_vdso32ld = $(CC) $(c_flags) -Wl,-T $^ -o $@ 51quiet_cmd_vdso32as = VDSO32A $@ 52 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $< 53 54# install commands for the unstripped file 55quiet_cmd_vdso_install = INSTALL $@ 56 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 57 58vdso32.so: $(obj)/vdso32.so.dbg 59 @mkdir -p $(MODLIB)/vdso 60 $(call cmd,vdso_install) 61 62vdso_install: vdso32.so 63