1# SPDX-License-Identifier: GPL-2.0 2 3# List of files in the vdso, has to be asm only for now 4 5ARCH_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 6include $(srctree)/lib/vdso/Makefile 7 8obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o 9obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o 10 11ifneq ($(c-gettimeofday-y),) 12 CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y) 13 CFLAGS_vgettimeofday-32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) 14 CFLAGS_vgettimeofday-32.o += $(call cc-option, -fno-stack-protector) 15 CFLAGS_vgettimeofday-32.o += -DDISABLE_BRANCH_PROFILING 16 CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables 17 CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE) 18 CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc 19 CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) 20 CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) 21 CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector) 22 CFLAGS_vgettimeofday-64.o += -DDISABLE_BRANCH_PROFILING 23 CFLAGS_vgettimeofday-64.o += -ffreestanding -fasynchronous-unwind-tables 24 CFLAGS_REMOVE_vgettimeofday-64.o = $(CC_FLAGS_FTRACE) 25# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true 26# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is 27# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code 28# generation is minimal, it will just use r29 instead. 29 CFLAGS_vgettimeofday-64.o += $(call cc-option, -ffixed-r30) 30endif 31 32# Build rules 33 34ifdef CROSS32_COMPILE 35 VDSOCC := $(CROSS32_COMPILE)gcc 36else 37 VDSOCC := $(CC) 38endif 39 40targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o 41obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) 42targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o 43obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 44 45GCOV_PROFILE := n 46KCOV_INSTRUMENT := n 47UBSAN_SANITIZE := n 48KASAN_SANITIZE := n 49 50ccflags-y := -fno-common -fno-builtin 51ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack 52ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) 53# Filter flags that clang will warn are unused for linking 54ldflags-y += $(filter-out $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS)) 55 56CC32FLAGS := -m32 57LD32FLAGS := -Wl,-soname=linux-vdso32.so.1 58AS32FLAGS := -D__VDSO32__ 59 60LD64FLAGS := -Wl,-soname=linux-vdso64.so.1 61AS64FLAGS := -D__VDSO64__ 62 63targets += vdso32.lds 64CPPFLAGS_vdso32.lds += -P -C -Upowerpc 65targets += vdso64.lds 66CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 67 68# link rule for the .so file, .lds has to be first 69$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o FORCE 70 $(call if_changed,vdso32ld_and_check) 71$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o FORCE 72 $(call if_changed,vdso64ld_and_check) 73 74# assembly rules for the .S files 75$(obj-vdso32): %-32.o: %.S FORCE 76 $(call if_changed_dep,vdso32as) 77$(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE 78 $(call if_changed_dep,vdso32cc) 79$(obj-vdso64): %-64.o: %.S FORCE 80 $(call if_changed_dep,vdso64as) 81$(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE 82 $(call if_changed_dep,cc_o_c) 83 84# Generate VDSO offsets using helper script 85gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh 86quiet_cmd_vdso32sym = VDSO32SYM $@ 87 cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ 88gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh 89quiet_cmd_vdso64sym = VDSO64SYM $@ 90 cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@ 91 92include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE 93 $(call if_changed,vdso32sym) 94include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 95 $(call if_changed,vdso64sym) 96 97# actual build commands 98quiet_cmd_vdso32ld_and_check = VDSO32L $@ 99 cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) 100quiet_cmd_vdso32as = VDSO32A $@ 101 cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $< 102quiet_cmd_vdso32cc = VDSO32C $@ 103 cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $< 104 105quiet_cmd_vdso64ld_and_check = VDSO64L $@ 106 cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) 107quiet_cmd_vdso64as = VDSO64A $@ 108 cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $< 109 110OBJECT_FILES_NON_STANDARD := y 111