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 := $(ccflags-vdso) \
  16         -D__ASSEMBLY__ -Wa,-gdwarf-2
  17
  18 #
  19 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
  20 # the base address of VDSO, the linker will emit a R_MIPS_PC32
  21 # relocation in binutils > 2.25 but it will fail with older versions
  22 # because that relocation is not supported for that symbol. As a result
  23 # of which we are forced to disable the VDSO symbols when building
  24 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
  25 # can't use other methods to get the base address of VDSO please refer to
  26 # the comments on that file.
  27 #
  28 ifndef CONFIG_CPU_MIPSR6
  29   ifeq ($(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
  34 endif
  35
  36 # VDSO linker flags.
  37 VDSO_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
  43 GCOV_PROFILE := n
  44
  45 #
  46 # Shared build commands.
  47 #
  48
  49 quiet_cmd_vdsold = VDSO    $@
  50       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  51                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  52
  53 # Strip rule for the raw .so files
  54 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  55 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  56         $(call if_changed,objcopy)
  57
  58 hostprogs-y := genvdso
  59
  60 quiet_cmd_genvdso = GENVDSO $@
  61 define cmd_genvdso
  62         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  63         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  64 endef
  65
  66 #
  67 # Build native VDSO.
  68 #
  69
  70 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  71
  72 targets += $(obj-vdso-y)
  73 targets += vdso.lds
  74 targets += vdso.so.dbg.raw vdso.so.raw
  75 targets += vdso.so.dbg vdso.so
  76 targets += vdso-image.c
  77
  78 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  79
  80 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  81 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  82
  83 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  84
  85 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  86         $(call if_changed,vdsold)
  87
  88 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
  89                      $(obj)/genvdso FORCE
  90         $(call if_changed,genvdso)
  91
  92 obj-y += vdso-image.o
  93
  94 #
  95 # Build O32 VDSO.
  96 #
  97
  98 # Define these outside the ifdef to ensure they are picked up by clean.
  99 targets += $(obj-vdso-y:%.o=%-o32.o)
 100 targets += vdso-o32.lds
 101 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 102 targets += vdso-o32.so.dbg vdso-o32.so
 103 targets += vdso-o32-image.c
 104
 105 ifdef CONFIG_MIPS32_O32
 106
 107 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 108
 109 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 110 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 111
 112 $(obj)/%-o32.o: $(src)/%.S FORCE
 113         $(call if_changed_dep,as_o_S)
 114
 115 $(obj)/%-o32.o: $(src)/%.c FORCE
 116         $(call cmd,force_checksrc)
 117         $(call if_changed_rule,cc_o_c)
 118
 119 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
 120 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 121         $(call if_changed_dep,cpp_lds_S)
 122
 123 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 124         $(call if_changed,vdsold)
 125
 126 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 127 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 128                          $(obj)/genvdso FORCE
 129         $(call if_changed,genvdso)
 130
 131 obj-y += vdso-o32-image.o
 132
 133 endif
 134
 135 #
 136 # Build N32 VDSO.
 137 #
 138
 139 targets += $(obj-vdso-y:%.o=%-n32.o)
 140 targets += vdso-n32.lds
 141 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 142 targets += vdso-n32.so.dbg vdso-n32.so
 143 targets += vdso-n32-image.c
 144
 145 ifdef CONFIG_MIPS32_N32
 146
 147 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 148
 149 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 150 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 151
 152 $(obj)/%-n32.o: $(src)/%.S FORCE
 153         $(call if_changed_dep,as_o_S)
 154
 155 $(obj)/%-n32.o: $(src)/%.c FORCE
 156         $(call cmd,force_checksrc)
 157         $(call if_changed_rule,cc_o_c)
 158
 159 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
 160 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 161         $(call if_changed_dep,cpp_lds_S)
 162
 163 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 164         $(call if_changed,vdsold)
 165
 166 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 167 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 168                          $(obj)/genvdso FORCE
 169         $(call if_changed,genvdso)
 170
 171 obj-y += vdso-n32-image.o
 172
 173 endif
 174
 175 # FIXME: Need install rule for debug.
 176 # Needs to deal with dependency for generation of dbg by cmd_genvdso...