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 vgetrandom-chacha.o 7obj-cvdso64 = vdso64_generic.o getcpu.o vgetrandom.o 8VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) 9CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 10CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE) 11CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) 12 13ifneq ($(c-getrandom-y),) 14 CFLAGS_vgetrandom.o += -include $(c-getrandom-y) 15endif 16 17# Build rules 18 19targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg 20obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 21obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) 22 23KBUILD_AFLAGS += -DBUILD_VDSO 24KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 25 26KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 27KBUILD_AFLAGS_64 += -m64 28 29KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 30KBUILD_CFLAGS_64 := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_64)) 31KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) 32KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64)) 33KBUILD_CFLAGS_64 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_64)) 34KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables 35ldflags-y := -shared -soname=linux-vdso64.so.1 \ 36 --hash-style=both --build-id=sha1 -T 37 38$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) 39$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) 40 41obj-y += vdso64_wrapper.o 42targets += vdso64.lds 43CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 44 45# Force dependency (incbin is bad) 46$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 47 48quiet_cmd_vdso_and_check = VDSO $@ 49 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 50 51# link rule for the .so file, .lds has to be first 52$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE 53 $(call if_changed,vdso_and_check) 54 55# strip rule for the .so file 56$(obj)/%.so: OBJCOPYFLAGS := -S 57$(obj)/%.so: $(obj)/%.so.dbg FORCE 58 $(call if_changed,objcopy) 59 60# assembly rules for the .S files 61$(obj-vdso64): %.o: %.S FORCE 62 $(call if_changed_dep,vdso64as) 63 64$(obj-cvdso64): %.o: %.c FORCE 65 $(call if_changed_dep,vdso64cc) 66 67# actual build commands 68quiet_cmd_vdso64as = VDSO64A $@ 69 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 70quiet_cmd_vdso64cc = VDSO64C $@ 71 cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $< 72 73# Generate VDSO offsets using helper script 74gen-vdsosym := $(src)/gen_vdso_offsets.sh 75quiet_cmd_vdsosym = VDSOSYM $@ 76 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 77 78include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 79 $(call if_changed,vdsosym) 80