1 # SPDX-License-Identifier: GPL-2.0-only 2 # Copied from arch/tile/kernel/vdso/Makefile 3 4 # Include the generic Makefile to check the built vdso. 5 include $(srctree)/lib/vdso/Makefile 6 # Symbols present in the vdso 7 vdso-syms = rt_sigreturn 8 ifdef CONFIG_64BIT 9 vdso-syms += vgettimeofday 10 endif 11 vdso-syms += getcpu 12 vdso-syms += flush_icache 13 vdso-syms += hwprobe 14 vdso-syms += sys_hwprobe 15 16 # Files to link into the vdso 17 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o 18 19 ccflags-y := -fno-stack-protector 20 ccflags-y += -DDISABLE_BRANCH_PROFILING 21 ccflags-y += -fno-builtin 22 23 ifneq ($(c-gettimeofday-y),) 24 CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) 25 endif 26 27 CFLAGS_hwprobe.o += -fPIC 28 29 # Build rules 30 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds 31 obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 32 33 obj-y += vdso.o 34 CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 35 ifneq ($(filter vgettimeofday, $(vdso-syms)),) 36 CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY 37 endif 38 39 # Disable -pg to prevent insert call site 40 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) 41 CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) 42 43 # Force dependency 44 $(obj)/vdso.o: $(obj)/vdso.so 45 46 # link rule for the .so file, .lds has to be first 47 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 48 $(call if_changed,vdsold) 49 LDFLAGS_vdso.so.dbg = -shared -soname=linux-vdso.so.1 \ 50 --build-id=sha1 --hash-style=both --eh-frame-hdr 51 52 # strip rule for the .so file 53 $(obj)/%.so: OBJCOPYFLAGS := -S 54 $(obj)/%.so: $(obj)/%.so.dbg FORCE 55 $(call if_changed,objcopy) 56 57 # Generate VDSO offsets using helper script 58 gen-vdsosym := $(src)/gen_vdso_offsets.sh 59 quiet_cmd_vdsosym = VDSOSYM $@ 60 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 61 62 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 63 $(call if_changed,vdsosym) 64 65 # actual build commands 66 # The DSO images are built using a special linker script 67 # Make sure only to export the intended __vdso_xxx symbol offsets. 68 quiet_cmd_vdsold = VDSOLD $@ 69 cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \ 70 $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ 71 rm $@.tmp
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.