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