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 # This flag is supported by clang for 64-bit but not 32-bit so it will cause 20 # an unused command line flag warning for this file. 21 ifdef CONFIG_CC_IS_CLANG 22 CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection 23 endif 24 CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) 25 CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) 26 CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector) 27 CFLAGS_vgettimeofday-64.o += -DDISABLE_BRANCH_PROFILING 28 CFLAGS_vgettimeofday-64.o += -ffreestanding -fasynchronous-unwind-tables 29 CFLAGS_REMOVE_vgettimeofday-64.o = $(CC_FLAGS_FTRACE) 30# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true 31# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is 32# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code 33# generation is minimal, it will just use r29 instead. 34 CFLAGS_vgettimeofday-64.o += $(call cc-option, -ffixed-r30) 35endif 36 37# Build rules 38 39ifdef CROSS32_COMPILE 40 VDSOCC := $(CROSS32_COMPILE)gcc 41else 42 VDSOCC := $(CC) 43endif 44 45targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o 46obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) 47targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o 48obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 49 50GCOV_PROFILE := n 51KCOV_INSTRUMENT := n 52UBSAN_SANITIZE := n 53KASAN_SANITIZE := n 54 55ccflags-y := -fno-common -fno-builtin 56ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack 57ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) 58# Filter flags that clang will warn are unused for linking 59ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS)) 60 61CC32FLAGS := -m32 62LD32FLAGS := -Wl,-soname=linux-vdso32.so.1 63AS32FLAGS := -D__VDSO32__ 64 65LD64FLAGS := -Wl,-soname=linux-vdso64.so.1 66AS64FLAGS := -D__VDSO64__ 67 68targets += vdso32.lds 69CPPFLAGS_vdso32.lds += -P -C -Upowerpc 70targets += vdso64.lds 71CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 72 73# link rule for the .so file, .lds has to be first 74$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o FORCE 75 $(call if_changed,vdso32ld_and_check) 76$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o FORCE 77 $(call if_changed,vdso64ld_and_check) 78 79# assembly rules for the .S files 80$(obj-vdso32): %-32.o: %.S FORCE 81 $(call if_changed_dep,vdso32as) 82$(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE 83 $(call if_changed_dep,vdso32cc) 84$(obj-vdso64): %-64.o: %.S FORCE 85 $(call if_changed_dep,vdso64as) 86$(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE 87 $(call if_changed_dep,cc_o_c) 88 89# Generate VDSO offsets using helper script 90gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh 91quiet_cmd_vdso32sym = VDSO32SYM $@ 92 cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ 93gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh 94quiet_cmd_vdso64sym = VDSO64SYM $@ 95 cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@ 96 97include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE 98 $(call if_changed,vdso32sym) 99include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE 100 $(call if_changed,vdso64sym) 101 102# actual build commands 103quiet_cmd_vdso32ld_and_check = VDSO32L $@ 104 cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) 105quiet_cmd_vdso32as = VDSO32A $@ 106 cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $< 107quiet_cmd_vdso32cc = VDSO32C $@ 108 cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $< 109 110quiet_cmd_vdso64ld_and_check = VDSO64L $@ 111 cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) 112quiet_cmd_vdso64as = VDSO64A $@ 113 cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $< 114 115OBJECT_FILES_NON_STANDARD := y 116