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-asynchronous-unwind-tables) \
  15         $(call cc-option, -fno-stack-protector)
  16 aflags-vdso := $(ccflags-vdso) \
  17         -D__ASSEMBLY__ -Wa,-gdwarf-2
  18
  19 #
  20 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
  21 # the base address of VDSO, the linker will emit a R_MIPS_PC32
  22 # relocation in binutils > 2.25 but it will fail with older versions
  23 # because that relocation is not supported for that symbol. As a result
  24 # of which we are forced to disable the VDSO symbols when building
  25 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
  26 # can't use other methods to get the base address of VDSO please refer to
  27 # the comments on that file.
  28 #
  29 ifndef CONFIG_CPU_MIPSR6
  30   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
  31     $(warning MIPS VDSO requires binutils >= 2.25)
  32     obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
  33     ccflags-vdso += -DDISABLE_MIPS_VDSO
  34   endif
  35 endif
  36
  37 # VDSO linker flags.
  38 VDSO_LDFLAGS := \
  39         -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
  40         -nostdlib -shared \
  41         $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
  42         $(call cc-ldoption, -Wl$(comma)--build-id)
  43
  44 GCOV_PROFILE := n
  45
  46 #
  47 # Shared build commands.
  48 #
  49
  50 quiet_cmd_vdsold = VDSO    $@
  51       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  52                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  53
  54 quiet_cmd_vdsoas_o_S = AS       $@
  55       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  56
  57 # Strip rule for the raw .so files
  58 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  59 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  60         $(call if_changed,objcopy)
  61
  62 hostprogs-y := genvdso
  63
  64 quiet_cmd_genvdso = GENVDSO $@
  65 define cmd_genvdso
  66         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  67         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  68 endef
  69
  70 #
  71 # Build native VDSO.
  72 #
  73
  74 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  75
  76 targets += $(obj-vdso-y)
  77 targets += vdso.lds
  78 targets += vdso.so.dbg.raw vdso.so.raw
  79 targets += vdso.so.dbg vdso.so
  80 targets += vdso-image.c
  81
  82 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  83
  84 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  85 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  86
  87 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  88
  89 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  90         $(call if_changed,vdsold)
  91
  92 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
  93                      $(obj)/genvdso FORCE
  94         $(call if_changed,genvdso)
  95
  96 obj-y += vdso-image.o
  97
  98 #
  99 # Build O32 VDSO.
 100 #
 101
 102 # Define these outside the ifdef to ensure they are picked up by clean.
 103 targets += $(obj-vdso-y:%.o=%-o32.o)
 104 targets += vdso-o32.lds
 105 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 106 targets += vdso-o32.so.dbg vdso-o32.so
 107 targets += vdso-o32-image.c
 108
 109 ifdef CONFIG_MIPS32_O32
 110
 111 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 112
 113 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 114 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 115
 116 $(obj)/%-o32.o: $(src)/%.S FORCE
 117         $(call if_changed_dep,vdsoas_o_S)
 118
 119 $(obj)/%-o32.o: $(src)/%.c FORCE
 120         $(call cmd,force_checksrc)
 121         $(call if_changed_rule,cc_o_c)
 122
 123 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
 124 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 125         $(call if_changed_dep,cpp_lds_S)
 126
 127 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 128         $(call if_changed,vdsold)
 129
 130 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 131 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 132                          $(obj)/genvdso FORCE
 133         $(call if_changed,genvdso)
 134
 135 obj-y += vdso-o32-image.o
 136
 137 endif
 138
 139 #
 140 # Build N32 VDSO.
 141 #
 142
 143 targets += $(obj-vdso-y:%.o=%-n32.o)
 144 targets += vdso-n32.lds
 145 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 146 targets += vdso-n32.so.dbg vdso-n32.so
 147 targets += vdso-n32-image.c
 148
 149 ifdef CONFIG_MIPS32_N32
 150
 151 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 152
 153 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 154 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 155
 156 $(obj)/%-n32.o: $(src)/%.S FORCE
 157         $(call if_changed_dep,vdsoas_o_S)
 158
 159 $(obj)/%-n32.o: $(src)/%.c FORCE
 160         $(call cmd,force_checksrc)
 161         $(call if_changed_rule,cc_o_c)
 162
 163 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
 164 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 165         $(call if_changed_dep,cpp_lds_S)
 166
 167 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 168         $(call if_changed,vdsold)
 169
 170 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 171 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 172                          $(obj)/genvdso FORCE
 173         $(call if_changed,genvdso)
 174
 175 obj-y += vdso-n32-image.o
 176
 177 endif
 178
 179 # FIXME: Need install rule for debug.
 180 # Needs to deal with dependency for generation of dbg by cmd_genvdso...