1# SPDX-License-Identifier: GPL-2.0 2# List of files in the vdso 3 4KCOV_INSTRUMENT := n 5ARCH_REL_TYPE_ABS := R_390_COPY|R_390_GLOB_DAT|R_390_JMP_SLOT|R_390_RELATIVE 6ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT 7 8include $(srctree)/lib/vdso/Makefile 9obj-vdso64 = vdso_user_wrapper.o note.o 10obj-cvdso64 = vdso64_generic.o getcpu.o 11VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) 12CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 13CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) 14 15# Build rules 16 17targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg 18obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 19obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) 20 21KBUILD_AFLAGS += -DBUILD_VDSO 22KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 23 24KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 25KBUILD_AFLAGS_64 += -m64 -s 26 27KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 28KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin 29ldflags-y := -fPIC -shared -soname=linux-vdso64.so.1 \ 30 --hash-style=both --build-id=sha1 -T 31 32$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) 33$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) 34 35obj-y += vdso64_wrapper.o 36targets += vdso64.lds 37CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 38 39# Disable gcov profiling, ubsan and kasan for VDSO code 40GCOV_PROFILE := n 41UBSAN_SANITIZE := n 42KASAN_SANITIZE := n 43KCSAN_SANITIZE := n 44 45# Force dependency (incbin is bad) 46$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 47 48# link rule for the .so file, .lds has to be first 49$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE 50 $(call if_changed,ld) 51 52# strip rule for the .so file 53$(obj)/%.so: OBJCOPYFLAGS := -S 54$(obj)/%.so: $(obj)/%.so.dbg FORCE 55 $(call if_changed,objcopy) 56 57# assembly rules for the .S files 58$(obj-vdso64): %.o: %.S FORCE 59 $(call if_changed_dep,vdso64as) 60 61$(obj-cvdso64): %.o: %.c FORCE 62 $(call if_changed_dep,vdso64cc) 63 64# actual build commands 65quiet_cmd_vdso64as = VDSO64A $@ 66 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 67quiet_cmd_vdso64cc = VDSO64C $@ 68 cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $< 69 70# install commands for the unstripped file 71quiet_cmd_vdso_install = INSTALL $@ 72 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 73 74vdso64.so: $(obj)/vdso64.so.dbg 75 @mkdir -p $(MODLIB)/vdso 76 $(call cmd,vdso_install) 77 78vdso_install: vdso64.so 79 80# Generate VDSO offsets using helper script 81gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 82quiet_cmd_vdsosym = VDSOSYM $@ 83 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 84 85include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 86 $(call if_changed,vdsosym) 87