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 += -m31 -fPIC -shared -fno-common -fno-builtin 24 25LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \ 26 --hash-style=both --build-id=sha1 -melf_s390 -T 27 28$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 29$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 30 31obj-y += vdso32_wrapper.o 32targets += vdso32.lds 33CPPFLAGS_vdso32.lds += -P -C -U$(ARCH) 34 35# Disable gcov profiling, ubsan and kasan for VDSO code 36GCOV_PROFILE := n 37UBSAN_SANITIZE := n 38KASAN_SANITIZE := n 39KCSAN_SANITIZE := n 40 41# Force dependency (incbin is bad) 42$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so 43 44quiet_cmd_vdso_and_check = VDSO $@ 45 cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) 46 47$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE 48 $(call if_changed,vdso_and_check) 49 50# strip rule for the .so file 51$(obj)/%.so: OBJCOPYFLAGS := -S 52$(obj)/%.so: $(obj)/%.so.dbg FORCE 53 $(call if_changed,objcopy) 54 55$(obj-vdso32): %-32.o: %.S FORCE 56 $(call if_changed_dep,vdso32as) 57 58# actual build commands 59quiet_cmd_vdso32as = VDSO32A $@ 60 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $< 61quiet_cmd_vdso32cc = VDSO32C $@ 62 cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $< 63 64# install commands for the unstripped file 65quiet_cmd_vdso_install = INSTALL $@ 66 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 67 68vdso32.so: $(obj)/vdso32.so.dbg 69 @mkdir -p $(MODLIB)/vdso 70 $(call cmd,vdso_install) 71 72vdso_install: vdso32.so 73 74# Generate VDSO offsets using helper script 75gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 76quiet_cmd_vdsosym = VDSOSYM $@ 77 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 78 79include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE 80 $(call if_changed,vdsosym) 81