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