1# SPDX-License-Identifier: GPL-2.0 2# List of files in the vdso 3 4KCOV_INSTRUMENT := n 5 6# Include the generic Makefile to check the built vdso. 7include $(srctree)/lib/vdso/Makefile 8obj-vdso64 = vdso_user_wrapper.o note.o 9obj-cvdso64 = vdso64_generic.o getcpu.o 10VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) 11CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) 12CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) 13 14# Build rules 15 16targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg 17obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 18obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) 19 20KBUILD_AFLAGS += -DBUILD_VDSO 21KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 22 23KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) 24KBUILD_AFLAGS_64 += -m64 25 26KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) 27KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) 28KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64)) 29KBUILD_CFLAGS_64 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_64)) 30KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables 31ldflags-y := -shared -soname=linux-vdso64.so.1 \ 32 --hash-style=both --build-id=sha1 -T 33 34$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) 35$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) 36 37obj-y += vdso64_wrapper.o 38targets += vdso64.lds 39CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 40 41# Disable gcov profiling, ubsan and kasan for VDSO code 42GCOV_PROFILE := n 43UBSAN_SANITIZE := n 44KASAN_SANITIZE := n 45KCSAN_SANITIZE := n 46 47# Force dependency (incbin is bad) 48$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so 49 50quiet_cmd_vdso_and_check = VDSO $@ 51 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 52 53# link rule for the .so file, .lds has to be first 54$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE 55 $(call if_changed,vdso_and_check) 56 57# strip rule for the .so file 58$(obj)/%.so: OBJCOPYFLAGS := -S 59$(obj)/%.so: $(obj)/%.so.dbg FORCE 60 $(call if_changed,objcopy) 61 62# assembly rules for the .S files 63$(obj-vdso64): %.o: %.S FORCE 64 $(call if_changed_dep,vdso64as) 65 66$(obj-cvdso64): %.o: %.c FORCE 67 $(call if_changed_dep,vdso64cc) 68 69# actual build commands 70quiet_cmd_vdso64as = VDSO64A $@ 71 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 72quiet_cmd_vdso64cc = VDSO64C $@ 73 cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $< 74 75# install commands for the unstripped file 76quiet_cmd_vdso_install = INSTALL $@ 77 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 78 79vdso64.so: $(obj)/vdso64.so.dbg 80 @mkdir -p $(MODLIB)/vdso 81 $(call cmd,vdso_install) 82 83vdso_install: vdso64.so 84 85# Generate VDSO offsets using helper script 86gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 87quiet_cmd_vdsosym = VDSOSYM $@ 88 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 89 90include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 91 $(call if_changed,vdsosym) 92