1# SPDX-License-Identifier: GPL-2.0-only 2# Copied from arch/tile/kernel/vdso/Makefile 3 4# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before 5# the inclusion of generic Makefile. 6ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT 7include $(srctree)/lib/vdso/Makefile 8# Symbols present in the vdso 9vdso-syms = rt_sigreturn 10ifdef CONFIG_64BIT 11vdso-syms += vgettimeofday 12endif 13vdso-syms += getcpu 14vdso-syms += flush_icache 15vdso-syms += hwprobe 16vdso-syms += sys_hwprobe 17 18# Files to link into the vdso 19obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o 20 21ccflags-y := -fno-stack-protector 22ccflags-y += -DDISABLE_BRANCH_PROFILING 23 24ifneq ($(c-gettimeofday-y),) 25 CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) 26endif 27 28CFLAGS_hwprobe.o += -fPIC 29 30# Build rules 31targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds 32obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 33 34obj-y += vdso.o 35CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 36ifneq ($(filter vgettimeofday, $(vdso-syms)),) 37CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY 38endif 39 40# Disable -pg to prevent insert call site 41CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) 42 43# Disable profiling and instrumentation for VDSO code 44GCOV_PROFILE := n 45KCOV_INSTRUMENT := n 46KASAN_SANITIZE := n 47UBSAN_SANITIZE := n 48 49# Force dependency 50$(obj)/vdso.o: $(obj)/vdso.so 51 52# link rule for the .so file, .lds has to be first 53$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 54 $(call if_changed,vdsold) 55LDFLAGS_vdso.so.dbg = -shared -S -soname=linux-vdso.so.1 \ 56 --build-id=sha1 --hash-style=both --eh-frame-hdr 57 58# strip rule for the .so file 59$(obj)/%.so: OBJCOPYFLAGS := -S 60$(obj)/%.so: $(obj)/%.so.dbg FORCE 61 $(call if_changed,objcopy) 62 63# Generate VDSO offsets using helper script 64gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 65quiet_cmd_vdsosym = VDSOSYM $@ 66 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 67 68include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 69 $(call if_changed,vdsosym) 70 71# actual build commands 72# The DSO images are built using a special linker script 73# Make sure only to export the intended __vdso_xxx symbol offsets. 74quiet_cmd_vdsold = VDSOLD $@ 75 cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \ 76 $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ 77 rm $@.tmp 78 79# install commands for the unstripped file 80quiet_cmd_vdso_install = INSTALL $@ 81 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 82 83vdso.so: $(obj)/vdso.so.dbg 84 @mkdir -p $(MODLIB)/vdso 85 $(call cmd,vdso_install) 86 87vdso_install: vdso.so 88