| # SPDX-License-Identifier: GPL-2.0 |
| # List of files in the vdso |
| |
| # Include the generic Makefile to check the built vdso. |
| include $(srctree)/lib/vdso/Makefile.include |
| obj-vdso = vdso_user_wrapper.o note.o vgetrandom-chacha.o |
| obj-cvdso = vdso_generic.o getcpu.o vgetrandom.o |
| VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) |
| CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) |
| CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE) |
| CFLAGS_REMOVE_vdso_generic.o = $(VDSO_CFLAGS_REMOVE) |
| |
| ifneq ($(c-getrandom-y),) |
| CFLAGS_vgetrandom.o += -include $(c-getrandom-y) |
| endif |
| |
| # Build rules |
| |
| targets := $(obj-vdso) $(obj-cvdso) vdso.so vdso.so.dbg |
| obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
| obj-cvdso := $(addprefix $(obj)/, $(obj-cvdso)) |
| |
| KBUILD_AFLAGS_VDSO := $(KBUILD_AFLAGS) -DBUILD_VDSO |
| |
| KBUILD_CFLAGS_VDSO := $(KBUILD_CFLAGS) -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING |
| KBUILD_CFLAGS_VDSO := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_VDSO)) |
| KBUILD_CFLAGS_VDSO := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_VDSO)) |
| KBUILD_CFLAGS_VDSO := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_VDSO)) |
| KBUILD_CFLAGS_VDSO := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_VDSO)) |
| KBUILD_CFLAGS_VDSO += -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables |
| KBUILD_CFLAGS_VDSO += -fno-stack-protector $(DISABLE_KSTACK_ERASE) |
| ldflags-y := -shared -soname=linux-vdso.so.1 \ |
| --hash-style=both --build-id=sha1 -T |
| |
| $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_VDSO) |
| $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_VDSO) |
| |
| obj-y += vdso_wrapper.o |
| targets += vdso.lds |
| CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
| |
| # Force dependency (incbin is bad) |
| $(obj)/vdso_wrapper.o : $(obj)/vdso.so |
| |
| quiet_cmd_vdso_and_check = VDSO $@ |
| cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check) |
| |
| # link rule for the .so file, .lds has to be first |
| $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) $(obj-cvdso) FORCE |
| $(call if_changed,vdso_and_check) |
| |
| # strip rule for the .so file |
| $(obj)/%.so: OBJCOPYFLAGS := -S |
| $(obj)/%.so: $(obj)/%.so.dbg FORCE |
| $(call if_changed,objcopy) |
| |
| # assembly rules for the .S files |
| $(obj-vdso): %.o: %.S FORCE |
| $(call if_changed_dep,vdsoas) |
| |
| $(obj-cvdso): %.o: %.c FORCE |
| $(call if_changed_dep,vdsocc) |
| |
| # actual build commands |
| quiet_cmd_vdsoas = VDSOA $@ |
| cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< |
| quiet_cmd_vdsocc = VDSOC $@ |
| cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $< |
| |
| # Generate VDSO offsets using helper script |
| gen-vdsosym := $(src)/gen_vdso_offsets.sh |
| quiet_cmd_vdsosym = VDSOSYM $@ |
| cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ |
| |
| include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE |
| $(call if_changed,vdsosym) |
