arch/mips/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
   4
   5 # Common compiler flags between ABIs.
   6 ccflags-vdso := \
   7         $(filter -I%,$(KBUILD_CFLAGS)) \
   8         $(filter -E%,$(KBUILD_CFLAGS)) \
   9         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
  10         $(filter -march=%,$(KBUILD_CFLAGS)) \
  11         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  12         -D__VDSO__
  13
  14 ifdef CONFIG_CC_IS_CLANG
  15 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
  16 endif
  17
  18 cflags-vdso := $(ccflags-vdso) \
  19         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  20         -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  21         -DDISABLE_BRANCH_PROFILING \
  22         $(call cc-option, -fno-asynchronous-unwind-tables) \
  23         $(call cc-option, -fno-stack-protector)
  24 aflags-vdso := $(ccflags-vdso) \
  25         -D__ASSEMBLY__ -Wa,-gdwarf-2
  26
  27 #
  28 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
  29 # the base address of VDSO, the linker will emit a R_MIPS_PC32
  30 # relocation in binutils > 2.25 but it will fail with older versions
  31 # because that relocation is not supported for that symbol. As a result
  32 # of which we are forced to disable the VDSO symbols when building
  33 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
  34 # can't use other methods to get the base address of VDSO please refer to
  35 # the comments on that file.
  36 #
  37 ifndef CONFIG_CPU_MIPSR6
  38   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
  39     $(warning MIPS VDSO requires binutils >= 2.25)
  40     obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
  41     ccflags-vdso += -DDISABLE_MIPS_VDSO
  42   endif
  43 endif
  44
  45 # VDSO linker flags.
  46 VDSO_LDFLAGS := \
  47         -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
  48         $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
  49         -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
  50
  51 GCOV_PROFILE := n
  52 UBSAN_SANITIZE := n
  53
  54 #
  55 # Shared build commands.
  56 #
  57
  58 quiet_cmd_vdsold = VDSO    $@
  59       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  60                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  61
  62 quiet_cmd_vdsoas_o_S = AS       $@
  63       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  64
  65 # Strip rule for the raw .so files
  66 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  67 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  68         $(call if_changed,objcopy)
  69
  70 hostprogs-y := genvdso
  71
  72 quiet_cmd_genvdso = GENVDSO $@
  73 define cmd_genvdso
  74         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  75         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  76 endef
  77
  78 #
  79 # Build native VDSO.
  80 #
  81
  82 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  83
  84 targets += $(obj-vdso-y)
  85 targets += vdso.lds
  86 targets += vdso.so.dbg.raw vdso.so.raw
  87 targets += vdso.so.dbg vdso.so
  88 targets += vdso-image.c
  89
  90 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  91
  92 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  93 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  94
  95 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  96
  97 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  98         $(call if_changed,vdsold)
  99
 100 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 101                      $(obj)/genvdso FORCE
 102         $(call if_changed,genvdso)
 103
 104 obj-y += vdso-image.o
 105
 106 #
 107 # Build O32 VDSO.
 108 #
 109
 110 # Define these outside the ifdef to ensure they are picked up by clean.
 111 targets += $(obj-vdso-y:%.o=%-o32.o)
 112 targets += vdso-o32.lds
 113 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 114 targets += vdso-o32.so.dbg vdso-o32.so
 115 targets += vdso-o32-image.c
 116
 117 ifdef CONFIG_MIPS32_O32
 118
 119 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 120
 121 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 122 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 123
 124 $(obj)/%-o32.o: $(src)/%.S FORCE
 125         $(call if_changed_dep,vdsoas_o_S)
 126
 127 $(obj)/%-o32.o: $(src)/%.c FORCE
 128         $(call cmd,force_checksrc)
 129         $(call if_changed_rule,cc_o_c)
 130
 131 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 132 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 133         $(call if_changed_dep,cpp_lds_S)
 134
 135 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 136         $(call if_changed,vdsold)
 137
 138 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 139 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 140                          $(obj)/genvdso FORCE
 141         $(call if_changed,genvdso)
 142
 143 obj-y += vdso-o32-image.o
 144
 145 endif
 146
 147 #
 148 # Build N32 VDSO.
 149 #
 150
 151 targets += $(obj-vdso-y:%.o=%-n32.o)
 152 targets += vdso-n32.lds
 153 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 154 targets += vdso-n32.so.dbg vdso-n32.so
 155 targets += vdso-n32-image.c
 156
 157 ifdef CONFIG_MIPS32_N32
 158
 159 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 160
 161 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 162 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 163
 164 $(obj)/%-n32.o: $(src)/%.S FORCE
 165         $(call if_changed_dep,vdsoas_o_S)
 166
 167 $(obj)/%-n32.o: $(src)/%.c FORCE
 168         $(call cmd,force_checksrc)
 169         $(call if_changed_rule,cc_o_c)
 170
 171 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 172 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 173         $(call if_changed_dep,cpp_lds_S)
 174
 175 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 176         $(call if_changed,vdsold)
 177
 178 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 179 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 180                          $(obj)/genvdso FORCE
 181         $(call if_changed,genvdso)
 182
 183 obj-y += vdso-n32-image.o
 184
 185 endif
 186
 187 # FIXME: Need install rule for debug.
 188 # Needs to deal with dependency for generation of dbg by cmd_genvdso...