| # SPDX-License-Identifier: GPL-2.0 |
| # Objects to go into the VDSO. |
| |
| KASAN_SANITIZE := n |
| KCOV_INSTRUMENT := n |
| |
| # Include the generic Makefile to check the built vdso. |
| include $(srctree)/lib/vdso/Makefile |
| |
| obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o |
| |
| # Common compiler flags between ABIs. |
| ccflags-vdso := \ |
| $(filter -I%,$(KBUILD_CFLAGS)) \ |
| $(filter -E%,$(KBUILD_CFLAGS)) \ |
| $(filter -march=%,$(KBUILD_CFLAGS)) \ |
| $(filter -m%-float,$(KBUILD_CFLAGS)) \ |
| $(CLANG_FLAGS) \ |
| -D__VDSO__ |
| |
| cflags-vdso := $(ccflags-vdso) \ |
| -isystem $(shell $(CC) -print-file-name=include) \ |
| $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ |
| -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ |
| -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ |
| $(call cc-option, -fno-asynchronous-unwind-tables) \ |
| $(call cc-option, -fno-stack-protector) |
| aflags-vdso := $(ccflags-vdso) \ |
| -D__ASSEMBLY__ -Wa,-gdwarf-2 |
| |
| ifneq ($(c-gettimeofday-y),) |
| CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) |
| endif |
| |
| # VDSO linker flags. |
| ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ |
| $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ |
| --hash-style=sysv --build-id -T |
| |
| GCOV_PROFILE := n |
| |
| # |
| # Shared build commands. |
| # |
| |
| quiet_cmd_vdsold_and_vdso_check = LD $@ |
| cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) |
| |
| quiet_cmd_vdsoas_o_S = AS $@ |
| cmd_vdsoas_o_S = $(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/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE |
| $(call if_changed,vdsosym) |
| |
| # |
| # Build native VDSO. |
| # |
| |
| native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) |
| |
| targets += $(obj-vdso-y) |
| targets += vdso.lds vdso.so.dbg vdso.so |
| |
| obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) |
| |
| $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) |
| $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) |
| |
| $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) |
| |
| $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE |
| $(call if_changed,vdsold_and_vdso_check) |
| |
| $(obj)/vdso.so: OBJCOPYFLAGS := -S |
| $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE |
| $(call if_changed,objcopy) |
| |
| obj-y += vdso.o |
| |
| $(obj)/vdso.o : $(obj)/vdso.so |
| |
| # install commands for the unstripped file |
| quiet_cmd_vdso_install = INSTALL $@ |
| cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
| |
| vdso.so: $(obj)/vdso.so.dbg |
| @mkdir -p $(MODLIB)/vdso |
| $(call cmd,vdso_install) |
| |
| vdso_install: vdso.so |