| # List of files in the vdso, has to be asm only for now | |
| obj-vdso64 = note.o sigtramp.o restart_syscall.o | |
| # Build rules | |
| targets := $(obj-vdso64) vdso64.so | |
| obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) | |
| ccflags-y := -shared -fno-common -fno-builtin | |
| ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \ | |
| $(call ld-option, -Wl$(comma)--hash-style=sysv) | |
| asflags-y := -D__VDSO64__ -s | |
| KBUILD_AFLAGS += -DBUILD_VDSO | |
| KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING | |
| VDSO_LIBGCC := $(shell $(CC) -print-libgcc-file-name) | |
| obj-y += vdso64_wrapper.o | |
| extra-y += vdso64.lds | |
| CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) | |
| $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE | |
| # Force dependency (incbin is bad) | |
| # link rule for the .so file, .lds has to be first | |
| $(obj)/vdso64.so: $(src)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC) | |
| $(call if_changed,vdso64ld) | |
| # assembly rules for the .S files | |
| $(obj-vdso64): %.o: %.S FORCE | |
| $(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 $@ $< | |
| # Generate VDSO offsets using helper script | |
| gen-vdsosym := $(srctree)/$(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 FORCE | |
| $(call if_changed,vdsosym) |