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