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