1# SPDX-License-Identifier: GPL-2.0 2# List of files in the vdso 3 4KCOV_INSTRUMENT := n 5 6# Include the generic Makefile to check the built vdso. 7include $(srctree)/lib/vdso/Makefile 8obj-vdso64 = vdso_user_wrapper.o note.o 9obj-cvdso64 = vdso64_generic.o getcpu.o 10VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) 11CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 12CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) 13 14# Build rules 15 16targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg 17obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 18obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) 19 20KBUILD_AFLAGS += -DBUILD_VDSO 21KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 22 23KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 24KBUILD_AFLAGS_64 += -m64 25 26KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 27KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin 28ldflags-y := -fPIC -shared -soname=linux-vdso64.so.1 \ 29 --hash-style=both --build-id=sha1 -T 30 31$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) 32$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) 33 34obj-y += vdso64_wrapper.o 35targets += vdso64.lds 36CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 37 38# Disable gcov profiling, ubsan and kasan for VDSO code 39GCOV_PROFILE := n 40UBSAN_SANITIZE := n 41KASAN_SANITIZE := n 42KCSAN_SANITIZE := n 43 44# Force dependency (incbin is bad) 45$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 46 47# link rule for the .so file, .lds has to be first 48$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE 49 $(call if_changed,ld) 50 51# strip rule for the .so file 52$(obj)/%.so: OBJCOPYFLAGS := -S 53$(obj)/%.so: $(obj)/%.so.dbg FORCE 54 $(call if_changed,objcopy) 55 56# assembly rules for the .S files 57$(obj-vdso64): %.o: %.S FORCE 58 $(call if_changed_dep,vdso64as) 59 60$(obj-cvdso64): %.o: %.c FORCE 61 $(call if_changed_dep,vdso64cc) 62 63# actual build commands 64quiet_cmd_vdso64as = VDSO64A $@ 65 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 66quiet_cmd_vdso64cc = VDSO64C $@ 67 cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $< 68 69# install commands for the unstripped file 70quiet_cmd_vdso_install = INSTALL $@ 71 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 72 73vdso64.so: $(obj)/vdso64.so.dbg 74 @mkdir -p $(MODLIB)/vdso 75 $(call cmd,vdso_install) 76 77vdso_install: vdso64.so 78 79# Generate VDSO offsets using helper script 80gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 81quiet_cmd_vdsosym = VDSOSYM $@ 82 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 83 84include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 85 $(call if_changed,vdsosym) 86