arch/mips/vdso/Makefile

   1 # Objects to go into the VDSO.
   2 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
   3
   4 # Common compiler flags between ABIs.
   5 ccflags-vdso := \
   6         $(filter -I%,$(KBUILD_CFLAGS)) \
   7         $(filter -E%,$(KBUILD_CFLAGS)) \
   8         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
   9         $(filter -march=%,$(KBUILD_CFLAGS))
  10 cflags-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-stack-protector)
  15 aflags-vdso := $(ccflags-vdso) \
  16         $(filter -I%,$(KBUILD_CFLAGS)) \
  17         $(filter -E%,$(KBUILD_CFLAGS)) \
  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 #
  30 ifndef 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
  36 endif
  37
  38 # VDSO linker flags.
  39 VDSO_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
  45 GCOV_PROFILE := n
  46
  47 #
  48 # Shared build commands.
  49 #
  50
  51 quiet_cmd_vdsold = VDSO    $@
  52       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  53                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  54
  55 hostprogs-y := genvdso
  56
  57 quiet_cmd_genvdso = GENVDSO $@
  58 define cmd_genvdso
  59         cp $< $(<:%.dbg=%) && \
  60         $(OBJCOPY) -S $< $(<:%.dbg=%) && \
  61         $(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
  62 endef
  63
  64 #
  65 # Build native VDSO.
  66 #
  67
  68 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  69
  70 targets += $(obj-vdso-y)
  71 targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
  72
  73 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  74
  75 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  76 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  77
  78 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
  79
  80 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
  81         $(call if_changed,vdsold)
  82
  83 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg $(obj)/genvdso FORCE
  84         $(call if_changed,genvdso)
  85
  86 obj-y += vdso-image.o
  87
  88 #
  89 # Build O32 VDSO.
  90 #
  91
  92 # Define these outside the ifdef to ensure they are picked up by clean.
  93 targets += $(obj-vdso-y:%.o=%-o32.o)
  94 targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
  95
  96 ifdef CONFIG_MIPS32_O32
  97
  98 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
  99
 100 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 101 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 102
 103 $(obj)/%-o32.o: $(src)/%.S FORCE
 104         $(call if_changed_dep,as_o_S)
 105
 106 $(obj)/%-o32.o: $(src)/%.c FORCE
 107         $(call cmd,force_checksrc)
 108         $(call if_changed_rule,cc_o_c)
 109
 110 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
 111 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 112         $(call if_changed_dep,cpp_lds_S)
 113
 114 $(obj)/vdso-o32.so.dbg: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 115         $(call if_changed,vdsold)
 116
 117 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 118 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg $(obj)/genvdso FORCE
 119         $(call if_changed,genvdso)
 120
 121 obj-y += vdso-o32-image.o
 122
 123 endif
 124
 125 #
 126 # Build N32 VDSO.
 127 #
 128
 129 targets += $(obj-vdso-y:%.o=%-n32.o)
 130 targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
 131
 132 ifdef CONFIG_MIPS32_N32
 133
 134 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 135
 136 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 137 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 138
 139 $(obj)/%-n32.o: $(src)/%.S FORCE
 140         $(call if_changed_dep,as_o_S)
 141
 142 $(obj)/%-n32.o: $(src)/%.c FORCE
 143         $(call cmd,force_checksrc)
 144         $(call if_changed_rule,cc_o_c)
 145
 146 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
 147 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 148         $(call if_changed_dep,cpp_lds_S)
 149
 150 $(obj)/vdso-n32.so.dbg: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 151         $(call if_changed,vdsold)
 152
 153 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 154 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg $(obj)/genvdso FORCE
 155         $(call if_changed,genvdso)
 156
 157 obj-y += vdso-n32-image.o
 158
 159 endif
 160
 161 # FIXME: Need install rule for debug.
 162 # Needs to deal with dependency for generation of dbg by cmd_genvdso...