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.include 6obj-vdso = vdso_user_wrapper.o note.o vgetrandom-chacha.o 7obj-cvdso = vdso_generic.o getcpu.o vgetrandom.o 8VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) 9CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 10CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE) 11CFLAGS_REMOVE_vdso_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-vdso) $(obj-cvdso) vdso.so vdso.so.dbg 20obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 21obj-cvdso := $(addprefix $(obj)/, $(obj-cvdso)) 22 23KBUILD_AFLAGS_VDSO := $(KBUILD_AFLAGS) -DBUILD_VDSO 24 25KBUILD_CFLAGS_VDSO := $(KBUILD_CFLAGS) -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 26KBUILD_CFLAGS_VDSO := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_VDSO)) 27KBUILD_CFLAGS_VDSO := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_VDSO)) 28KBUILD_CFLAGS_VDSO := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_VDSO)) 29KBUILD_CFLAGS_VDSO := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_VDSO)) 30KBUILD_CFLAGS_VDSO += -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables 31KBUILD_CFLAGS_VDSO += -fno-stack-protector $(DISABLE_KSTACK_ERASE) 32KBUILD_CFLAGS_VDSO += $(CONFIG_CC_OPT_INLINE_MEMSET) 33ldflags-y := -shared -soname=linux-vdso.so.1 \ 34 --hash-style=both --build-id=sha1 \ 35 $(call ld-option, --eh-frame-hdr) -T 36 37$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_VDSO) 38$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_VDSO) 39 40obj-y += vdso_wrapper.o 41targets += vdso.lds 42CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 43 44# Force dependency (incbin is bad) 45$(obj)/vdso_wrapper.o : $(obj)/vdso.so 46 47quiet_cmd_vdso_and_check = VDSO $@ 48 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 49 50# link rule for the .so file, .lds has to be first 51$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) $(obj-cvdso) FORCE 52 $(call if_changed,vdso_and_check) 53 54# strip rule for the .so file 55$(obj)/%.so: OBJCOPYFLAGS := -S 56$(obj)/%.so: $(obj)/%.so.dbg FORCE 57 $(call if_changed,objcopy) 58 59# assembly rules for the .S files 60$(obj-vdso): %.o: %.S FORCE 61 $(call if_changed_dep,vdsoas) 62 63$(obj-cvdso): %.o: %.c FORCE 64 $(call if_changed_dep,vdsocc) 65 66# actual build commands 67quiet_cmd_vdsoas = VDSOA $@ 68 cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< 69quiet_cmd_vdsocc = VDSOC $@ 70 cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $< 71 72# Generate VDSO offsets using helper script 73gen-vdsosym := $(src)/gen_vdso_offsets.sh 74quiet_cmd_vdsosym = VDSOSYM $@ 75 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 76 77include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 78 $(call if_changed,vdsosym) 79