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, $(vdso-syms)) note.o 18 19ccflags-y := -fno-stack-protector 20ccflags-y += -DDISABLE_BRANCH_PROFILING 21 22ifneq ($(c-gettimeofday-y),) 23 CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) 24endif 25 26# Build rules 27targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds 28obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 29 30obj-y += vdso.o 31CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 32ifneq ($(filter vgettimeofday, $(vdso-syms)),) 33CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY 34endif 35 36# Disable -pg to prevent insert call site 37CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) 38 39# Disable profiling and instrumentation for VDSO code 40GCOV_PROFILE := n 41KCOV_INSTRUMENT := n 42KASAN_SANITIZE := n 43UBSAN_SANITIZE := n 44 45# Force dependency 46$(obj)/vdso.o: $(obj)/vdso.so 47 48# link rule for the .so file, .lds has to be first 49$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 50 $(call if_changed,vdsold) 51LDFLAGS_vdso.so.dbg = -shared -S -soname=linux-vdso.so.1 \ 52 --build-id=sha1 --hash-style=both --eh-frame-hdr 53 54# strip rule for the .so file 55$(obj)/%.so: OBJCOPYFLAGS := -S 56$(obj)/%.so: $(obj)/%.so.dbg FORCE 57 $(call if_changed,objcopy) 58 59# Generate VDSO offsets using helper script 60gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 61quiet_cmd_vdsosym = VDSOSYM $@ 62 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 63 64include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 65 $(call if_changed,vdsosym) 66 67# actual build commands 68# The DSO images are built using a special linker script 69# Make sure only to export the intended __vdso_xxx symbol offsets. 70quiet_cmd_vdsold = VDSOLD $@ 71 cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \ 72 $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ 73 rm $@.tmp 74 75# install commands for the unstripped file 76quiet_cmd_vdso_install = INSTALL $@ 77 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 78 79vdso.so: $(obj)/vdso.so.dbg 80 @mkdir -p $(MODLIB)/vdso 81 $(call cmd,vdso_install) 82 83vdso_install: vdso.so 84