| # SPDX-License-Identifier: GPL-2.0 |
| # List of files in the vdso, has to be asm only for now |
| |
| KCOV_INSTRUMENT := n |
| |
| obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o |
| |
| # Build rules |
| |
| targets := $(obj-vdso64) vdso64.so vdso64.so.dbg |
| obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) |
| |
| KBUILD_AFLAGS += -DBUILD_VDSO |
| KBUILD_CFLAGS += -DBUILD_VDSO |
| |
| KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
| KBUILD_AFLAGS_64 += -m64 -s |
| |
| KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
| KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin |
| KBUILD_CFLAGS_64 += -nostdlib -Wl,-soname=linux-vdso64.so.1 \ |
| $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
| |
| $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) |
| $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64) |
| |
| obj-y += vdso64_wrapper.o |
| extra-y += vdso64.lds |
| CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) |
| |
| # Disable gcov profiling and ubsan for VDSO code |
| GCOV_PROFILE := n |
| UBSAN_SANITIZE := n |
| |
| # Force dependency (incbin is bad) |
| $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so |
| |
| # link rule for the .so file, .lds has to be first |
| $(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) |
| $(call if_changed,vdso64ld) |
| |
| # 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 |
| $(call if_changed_dep,vdso64as) |
| |
| # actual build commands |
| quiet_cmd_vdso64ld = VDSO64L $@ |
| cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $^ -o $@ |
| quiet_cmd_vdso64as = VDSO64A $@ |
| cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< |
| |
| # install commands for the unstripped file |
| quiet_cmd_vdso_install = INSTALL $@ |
| cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
| |
| vdso64.so: $(obj)/vdso64.so.dbg |
| @mkdir -p $(MODLIB)/vdso |
| $(call cmd,vdso_install) |
| |
| vdso_install: vdso64.so |
