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         $(filter -march=%,$(KBUILD_CFLAGS))
   9 cflags-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)
  13 aflags-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 #
  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 hostprogs-y := genvdso
  54
  55 quiet_cmd_genvdso = GENVDSO $@
  56 define cmd_genvdso
  57         cp $< $(<:%.dbg=%) && \
  58         $(OBJCOPY) -S $< $(<:%.dbg=%) && \
  59         $(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
  60 endef
  61
  62 #
  63 # Build native VDSO.
  64 #
  65
  66 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  67
  68 targets += $(obj-vdso-y)
  69 targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
  70
  71 obj-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
  84 obj-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.
  91 targets += $(obj-vdso-y:%.o=%-o32.o)
  92 targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
  93
  94 ifdef CONFIG_MIPS32_O32
  95
  96 obj-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
 119 obj-y += vdso-o32-image.o
 120
 121 endif
 122
 123 #
 124 # Build N32 VDSO.
 125 #
 126
 127 targets += $(obj-vdso-y:%.o=%-n32.o)
 128 targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
 129
 130 ifdef CONFIG_MIPS32_N32
 131
 132 obj-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
 155 obj-y += vdso-n32-image.o
 156
 157 endif
 158
 159 # FIXME: Need install rule for debug.
 160 # Needs to deal with dependency for generation of dbg by cmd_genvdso...