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-vdso32 = vdso_user_wrapper-32.o note-32.o 9 10# Build rules 11 12targets := $(obj-vdso32) vdso32.so vdso32.so.dbg 13obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) 14 15KBUILD_AFLAGS += -DBUILD_VDSO 16KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 17 18KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) 19KBUILD_AFLAGS_32 += -m31 -s 20 21KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 22KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32)) 23KBUILD_CFLAGS_32 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_32)) 24KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin -fasynchronous-unwind-tables 25 26LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \ 27 --hash-style=both --build-id=sha1 -melf_s390 -T 28 29$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 30$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 31 32obj-y += vdso32_wrapper.o 33targets += vdso32.lds 34CPPFLAGS_vdso32.lds += -P -C -U$(ARCH) 35 36# Disable gcov profiling, ubsan and kasan for VDSO code 37GCOV_PROFILE := n 38UBSAN_SANITIZE := n 39KASAN_SANITIZE := n 40KCSAN_SANITIZE := n 41 42# Force dependency (incbin is bad) 43$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so 44 45quiet_cmd_vdso_and_check = VDSO $@ 46 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 47 48$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE 49 $(call if_changed,vdso_and_check) 50 51# strip rule for the .so file 52$(obj)/%.so: OBJCOPYFLAGS := -S 53$(obj)/%.so: $(obj)/%.so.dbg FORCE 54 $(call if_changed,objcopy) 55 56$(obj-vdso32): %-32.o: %.S FORCE 57 $(call if_changed_dep,vdso32as) 58 59# actual build commands 60quiet_cmd_vdso32as = VDSO32A $@ 61 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $< 62quiet_cmd_vdso32cc = VDSO32C $@ 63 cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $< 64 65# Generate VDSO offsets using helper script 66gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 67quiet_cmd_vdsosym = VDSOSYM $@ 68 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 69 70include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE 71 $(call if_changed,vdsosym) 72