1# SPDX-License-Identifier: GPL-2.0 2# Objects to go into the VDSO. 3obj-vdso-y := elf.o gettimeofday.o sigreturn.o 4 5# Common compiler flags between ABIs. 6ccflags-vdso := \ 7 $(filter -I%,$(KBUILD_CFLAGS)) \ 8 $(filter -E%,$(KBUILD_CFLAGS)) \ 9 $(filter -mmicromips,$(KBUILD_CFLAGS)) \ 10 $(filter -march=%,$(KBUILD_CFLAGS)) \ 11 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 12 -D__VDSO__ 13 14ifdef CONFIG_CC_IS_CLANG 15ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) 16endif 17 18cflags-vdso := $(ccflags-vdso) \ 19 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 20 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ 21 -DDISABLE_BRANCH_PROFILING \ 22 $(call cc-option, -fno-asynchronous-unwind-tables) \ 23 $(call cc-option, -fno-stack-protector) 24aflags-vdso := $(ccflags-vdso) \ 25 -D__ASSEMBLY__ -Wa,-gdwarf-2 26 27# 28# For the pre-R6 code in arch/mips/vdso/vdso.h for locating 29# the base address of VDSO, the linker will emit a R_MIPS_PC32 30# relocation in binutils > 2.25 but it will fail with older versions 31# because that relocation is not supported for that symbol. As a result 32# of which we are forced to disable the VDSO symbols when building 33# with < 2.25 binutils on pre-R6 kernels. For more references on why we 34# can't use other methods to get the base address of VDSO please refer to 35# the comments on that file. 36# 37ifndef CONFIG_CPU_MIPSR6 38 ifeq ($(call ld-ifversion, -lt, 225000000, y),y) 39 $(warning MIPS VDSO requires binutils >= 2.25) 40 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y)) 41 ccflags-vdso += -DDISABLE_MIPS_VDSO 42 endif 43endif 44 45# VDSO linker flags. 46VDSO_LDFLAGS := \ 47 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ 48 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \ 49 -nostdlib -shared \ 50 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 51 $(call cc-ldoption, -Wl$(comma)--build-id) 52 53GCOV_PROFILE := n 54UBSAN_SANITIZE := n 55 56# 57# Shared build commands. 58# 59 60quiet_cmd_vdsold = VDSO $@ 61 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ 62 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ 63 64quiet_cmd_vdsoas_o_S = AS $@ 65 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 66 67# Strip rule for the raw .so files 68$(obj)/%.so.raw: OBJCOPYFLAGS := -S 69$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 70 $(call if_changed,objcopy) 71 72hostprogs-y := genvdso 73 74quiet_cmd_genvdso = GENVDSO $@ 75define cmd_genvdso 76 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ 77 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) 78endef 79 80# 81# Build native VDSO. 82# 83 84native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 85 86targets += $(obj-vdso-y) 87targets += vdso.lds 88targets += vdso.so.dbg.raw vdso.so.raw 89targets += vdso.so.dbg vdso.so 90targets += vdso-image.c 91 92obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 93 94$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 95$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 96 97$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 98 99$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 100 $(call if_changed,vdsold) 101 102$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ 103 $(obj)/genvdso FORCE 104 $(call if_changed,genvdso) 105 106obj-y += vdso-image.o 107 108# 109# Build O32 VDSO. 110# 111 112# Define these outside the ifdef to ensure they are picked up by clean. 113targets += $(obj-vdso-y:%.o=%-o32.o) 114targets += vdso-o32.lds 115targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 116targets += vdso-o32.so.dbg vdso-o32.so 117targets += vdso-o32-image.c 118 119ifdef CONFIG_MIPS32_O32 120 121obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) 122 123$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 124$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 125 126$(obj)/%-o32.o: $(src)/%.S FORCE 127 $(call if_changed_dep,vdsoas_o_S) 128 129$(obj)/%-o32.o: $(src)/%.c FORCE 130 $(call cmd,force_checksrc) 131 $(call if_changed_rule,cc_o_c) 132 133$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 134$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 135 $(call if_changed_dep,cpp_lds_S) 136 137$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE 138 $(call if_changed,vdsold) 139 140$(obj)/vdso-o32-image.c: VDSO_NAME := o32 141$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ 142 $(obj)/genvdso FORCE 143 $(call if_changed,genvdso) 144 145obj-y += vdso-o32-image.o 146 147endif 148 149# 150# Build N32 VDSO. 151# 152 153targets += $(obj-vdso-y:%.o=%-n32.o) 154targets += vdso-n32.lds 155targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 156targets += vdso-n32.so.dbg vdso-n32.so 157targets += vdso-n32-image.c 158 159ifdef CONFIG_MIPS32_N32 160 161obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) 162 163$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 164$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 165 166$(obj)/%-n32.o: $(src)/%.S FORCE 167 $(call if_changed_dep,vdsoas_o_S) 168 169$(obj)/%-n32.o: $(src)/%.c FORCE 170 $(call cmd,force_checksrc) 171 $(call if_changed_rule,cc_o_c) 172 173$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 174$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 175 $(call if_changed_dep,cpp_lds_S) 176 177$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE 178 $(call if_changed,vdsold) 179 180$(obj)/vdso-n32-image.c: VDSO_NAME := n32 181$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ 182 $(obj)/genvdso FORCE 183 $(call if_changed,genvdso) 184 185obj-y += vdso-n32-image.o 186 187endif 188 189# FIXME: Need install rule for debug. 190# Needs to deal with dependency for generation of dbg by cmd_genvdso... 191