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