| # SPDX-License-Identifier: GPL-2.0 | |
| # List of files in the vdso, has to be asm only for now | |
| ARCH_REL_TYPE_ABS := R_PPC_JUMP_SLOT|R_PPC_GLOB_DAT|R_PPC_ADDR32|R_PPC_ADDR24|R_PPC_ADDR16|R_PPC_ADDR16_LO|R_PPC_ADDR16_HI|R_PPC_ADDR16_HA|R_PPC_ADDR14|R_PPC_ADDR14_BRTAKEN|R_PPC_ADDR14_BRNTAKEN|R_PPC_REL24 | |
| include $(srctree)/lib/vdso/Makefile | |
| obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o | |
| ifneq ($(c-gettimeofday-y),) | |
| CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) | |
| CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) | |
| CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector) | |
| CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING | |
| CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables | |
| CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) | |
| endif | |
| # Build rules | |
| targets := $(obj-vdso64) vdso64.so.dbg vgettimeofday.o | |
| obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) | |
| GCOV_PROFILE := n | |
| KCOV_INSTRUMENT := n | |
| UBSAN_SANITIZE := n | |
| KASAN_SANITIZE := n | |
| ccflags-y := -shared -fno-common -fno-builtin -nostdlib \ | |
| -Wl,-soname=linux-vdso64.so.1 -Wl,--hash-style=both | |
| # Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true | |
| # by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is | |
| # compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code | |
| # generation is minimal, it will just use r29 instead. | |
| ccflags-y += $(call cc-option, -ffixed-r30) | |
| asflags-y := -D__VDSO64__ -s | |
| targets += vdso64.lds | |
| CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) | |
| # link rule for the .so file, .lds has to be first | |
| $(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday.o FORCE | |
| $(call if_changed,vdso64ld_and_check) | |
| # 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.dbg FORCE | |
| $(call if_changed,vdsosym) | |
| # actual build commands | |
| quiet_cmd_vdso64ld_and_check = VDSO64L $@ | |
| cmd_vdso64ld_and_check = $(CC) $(c_flags) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) |