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