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 # Strip rule for the raw .so files
  56 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  57 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  58         $(call if_changed,objcopy)
  59
  60 hostprogs-y := genvdso
  61
  62 quiet_cmd_genvdso = GENVDSO $@
  63 define cmd_genvdso
  64         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  65         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  66 endef
  67
  68 #
  69 # Build native VDSO.
  70 #
  71
  72 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  73
  74 targets += $(obj-vdso-y)
  75 targets += vdso.lds
  76 targets += vdso.so.dbg.raw vdso.so.raw
  77 targets += vdso.so.dbg vdso.so
  78 targets += vdso-image.c
  79
  80 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  81
  82 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  83 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  84
  85 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
  86
  87 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  88         $(call if_changed,vdsold)
  89
  90 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
  91                      $(obj)/genvdso FORCE
  92         $(call if_changed,genvdso)
  93
  94 obj-y += vdso-image.o
  95
  96 #
  97 # Build O32 VDSO.
  98 #
  99
 100 # Define these outside the ifdef to ensure they are picked up by clean.
 101 targets += $(obj-vdso-y:%.o=%-o32.o)
 102 targets += vdso-o32.lds
 103 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 104 targets += vdso-o32.so.dbg vdso-o32.so
 105 targets += vdso-o32-image.c
 106
 107 ifdef CONFIG_MIPS32_O32
 108
 109 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 110
 111 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 112 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 113
 114 $(obj)/%-o32.o: $(src)/%.S FORCE
 115         $(call if_changed_dep,as_o_S)
 116
 117 $(obj)/%-o32.o: $(src)/%.c FORCE
 118         $(call cmd,force_checksrc)
 119         $(call if_changed_rule,cc_o_c)
 120
 121 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
 122 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 123         $(call if_changed_dep,cpp_lds_S)
 124
 125 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 126         $(call if_changed,vdsold)
 127
 128 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 129 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 130                          $(obj)/genvdso FORCE
 131         $(call if_changed,genvdso)
 132
 133 obj-y += vdso-o32-image.o
 134
 135 endif
 136
 137 #
 138 # Build N32 VDSO.
 139 #
 140
 141 targets += $(obj-vdso-y:%.o=%-n32.o)
 142 targets += vdso-n32.lds
 143 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 144 targets += vdso-n32.so.dbg vdso-n32.so
 145 targets += vdso-n32-image.c
 146
 147 ifdef CONFIG_MIPS32_N32
 148
 149 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 150
 151 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 152 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 153
 154 $(obj)/%-n32.o: $(src)/%.S FORCE
 155         $(call if_changed_dep,as_o_S)
 156
 157 $(obj)/%-n32.o: $(src)/%.c FORCE
 158         $(call cmd,force_checksrc)
 159         $(call if_changed_rule,cc_o_c)
 160
 161 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
 162 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 163         $(call if_changed_dep,cpp_lds_S)
 164
 165 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 166         $(call if_changed,vdsold)
 167
 168 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 169 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 170                          $(obj)/genvdso FORCE
 171         $(call if_changed,genvdso)
 172
 173 obj-y += vdso-n32-image.o
 174
 175 endif
 176
 177 # FIXME: Need install rule for debug.
 178 # Needs to deal with dependency for generation of dbg by cmd_genvdso...