| # 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 |
| obj-vdso64 = vdso_user_wrapper.o note.o vgetrandom-chacha.o |
| obj-cvdso64 = vdso64_generic.o getcpu.o vgetrandom.o |
| VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) |
| CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) |
| CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE) |
| CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) |
| |
| ifneq ($(c-getrandom-y),) |
| CFLAGS_vgetrandom.o += -include $(c-getrandom-y) |
| endif |
| |
| # Build rules |
| |
| targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg |
| obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) |
| obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64)) |
| |
| KBUILD_AFLAGS += -DBUILD_VDSO |
| KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING |
| |
| KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
| KBUILD_AFLAGS_64 += -m64 |
| |
| KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
| KBUILD_CFLAGS_64 := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_64)) |
| KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) |
| KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64)) |
| KBUILD_CFLAGS_64 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_64)) |
| KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables |
| ldflags-y := -shared -soname=linux-vdso64.so.1 \ |
| --hash-style=both --build-id=sha1 -T |
| |
| $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) |
| $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) |
| |
| obj-y += vdso64_wrapper.o |
| targets += vdso64.lds |
| CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) |
| |
| # Force dependency (incbin is bad) |
| $(obj)/vdso64_wrapper.o : $(obj)/vdso64.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)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) 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-vdso64): %.o: %.S FORCE |
| $(call if_changed_dep,vdso64as) |
| |
| $(obj-cvdso64): %.o: %.c FORCE |
| $(call if_changed_dep,vdso64cc) |
| |
| # actual build commands |
| quiet_cmd_vdso64as = VDSO64A $@ |
| cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< |
| quiet_cmd_vdso64cc = VDSO64C $@ |
| cmd_vdso64cc = $(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/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE |
| $(call if_changed,vdsosym) |
