1# SPDX-License-Identifier: GPL-2.0 2# List of files in the vdso 3 4# Include the generic Makefile to check the built vdso. 5include $(srctree)/lib/vdso/Makefile 6obj-vdso64 = vdso_user_wrapper.o note.o 7obj-cvdso64 = vdso64_generic.o getcpu.o 8VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) 9CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 10CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) 11 12# Build rules 13 14targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg 15obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 16obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) 17 18KBUILD_AFLAGS += -DBUILD_VDSO 19KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 20 21KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 22KBUILD_AFLAGS_64 += -m64 23 24KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 25KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) 26KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64)) 27KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin 28ldflags-y := -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# Force dependency (incbin is bad) 39$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 40 41quiet_cmd_vdso_and_check = VDSO $@ 42 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 43 44# link rule for the .so file, .lds has to be first 45$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE 46 $(call if_changed,vdso_and_check) 47 48# strip rule for the .so file 49$(obj)/%.so: OBJCOPYFLAGS := -S 50$(obj)/%.so: $(obj)/%.so.dbg FORCE 51 $(call if_changed,objcopy) 52 53# assembly rules for the .S files 54$(obj-vdso64): %.o: %.S FORCE 55 $(call if_changed_dep,vdso64as) 56 57$(obj-cvdso64): %.o: %.c FORCE 58 $(call if_changed_dep,vdso64cc) 59 60# actual build commands 61quiet_cmd_vdso64as = VDSO64A $@ 62 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 63quiet_cmd_vdso64cc = VDSO64C $@ 64 cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $< 65 66# Generate VDSO offsets using helper script 67gen-vdsosym := $(src)/gen_vdso_offsets.sh 68quiet_cmd_vdsosym = VDSOSYM $@ 69 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 70 71include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 72 $(call if_changed,vdsosym) 73