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 := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS)) 23KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32)) 24KBUILD_CFLAGS_32 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_32)) 25KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin -fasynchronous-unwind-tables 26 27LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \ 28 --hash-style=both --build-id=sha1 -melf_s390 -T 29 30$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 31$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 32 33obj-y += vdso32_wrapper.o 34targets += vdso32.lds 35CPPFLAGS_vdso32.lds += -P -C -U$(ARCH) 36 37# Disable gcov profiling, ubsan and kasan for VDSO code 38GCOV_PROFILE := n 39UBSAN_SANITIZE := n 40KASAN_SANITIZE := n 41KCSAN_SANITIZE := n 42 43# Force dependency (incbin is bad) 44$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so 45 46quiet_cmd_vdso_and_check = VDSO $@ 47 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 48 49$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE 50 $(call if_changed,vdso_and_check) 51 52# strip rule for the .so file 53$(obj)/%.so: OBJCOPYFLAGS := -S 54$(obj)/%.so: $(obj)/%.so.dbg FORCE 55 $(call if_changed,objcopy) 56 57$(obj-vdso32): %-32.o: %.S FORCE 58 $(call if_changed_dep,vdso32as) 59 60# actual build commands 61quiet_cmd_vdso32as = VDSO32A $@ 62 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $< 63quiet_cmd_vdso32cc = VDSO32C $@ 64 cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $< 65 66# Generate VDSO offsets using helper script 67gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 68quiet_cmd_vdsosym = VDSOSYM $@ 69 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 70 71include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE 72 $(call if_changed,vdsosym) 73