arch/mips/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
   5 # the inclusion of generic Makefile.
   6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
   7 include $(srctree)/lib/vdso/Makefile
   8
   9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
  10
  11 # Common compiler flags between ABIs.
  12 ccflags-vdso := \
  13         $(filter -I%,$(KBUILD_CFLAGS)) \
  14         $(filter -E%,$(KBUILD_CFLAGS)) \
  15         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
  16         $(filter -march=%,$(KBUILD_CFLAGS)) \
  17         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  18         $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
  19         -D__VDSO__
  20
  21 ifndef CONFIG_64BIT
  22 ccflags-vdso += -DBUILD_VDSO32
  23 endif
  24
  25 ifdef CONFIG_CC_IS_CLANG
  26 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
  27 endif
  28
  29 #
  30 # The -fno-jump-tables flag only prevents the compiler from generating
  31 # jump tables but does not prevent the compiler from emitting absolute
  32 # offsets.
  33 cflags-vdso := $(ccflags-vdso) \
  34         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  35         -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  36         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  37         $(call cc-option, -fno-asynchronous-unwind-tables) \
  38         $(call cc-option, -fno-stack-protector)
  39 aflags-vdso := $(ccflags-vdso) \
  40         -D__ASSEMBLY__ -Wa,-gdwarf-2
  41
  42 ifneq ($(c-gettimeofday-y),)
  43 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
  44
  45 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
  46 # library on a 64bit kernel.
  47 # Note: Needs to be included before than the generic library.
  48 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  49 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  50 endif
  51
  52 CFLAGS_REMOVE_vgettimeofday.o = -pg
  53
  54 #
  55 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
  56 # the base address of VDSO, the linker will emit a R_MIPS_PC32
  57 # relocation in binutils > 2.25 but it will fail with older versions
  58 # because that relocation is not supported for that symbol. As a result
  59 # of which we are forced to disable the VDSO symbols when building
  60 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
  61 # can't use other methods to get the base address of VDSO please refer to
  62 # the comments on that file.
  63 #
  64 ifndef CONFIG_CPU_MIPSR6
  65   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
  66     $(warning MIPS VDSO requires binutils >= 2.25)
  67     obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  68     ccflags-vdso += -DDISABLE_MIPS_VDSO
  69   endif
  70 endif
  71
  72 # VDSO linker flags.
  73 VDSO_LDFLAGS := \
  74         -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
  75         $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
  76         -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
  77
  78 CFLAGS_REMOVE_vdso.o = -pg
  79
  80 GCOV_PROFILE := n
  81 UBSAN_SANITIZE := n
  82 KCOV_INSTRUMENT := n
  83
  84 #
  85 # Shared build commands.
  86 #
  87
  88 quiet_cmd_vdsold_and_vdso_check = LD      $@
  89       cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
  90
  91 quiet_cmd_vdsold = VDSO    $@
  92       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  93                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  94
  95 quiet_cmd_vdsoas_o_S = AS      $@
  96       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  97
  98 # Strip rule for the raw .so files
  99 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
 100 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
 101         $(call if_changed,objcopy)
 102
 103 hostprogs := genvdso
 104
 105 quiet_cmd_genvdso = GENVDSO $@
 106 define cmd_genvdso
 107         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
 108         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
 109 endef
 110
 111 #
 112 # Build native VDSO.
 113 #
 114
 115 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 116
 117 targets += $(obj-vdso-y)
 118 targets += vdso.lds
 119 targets += vdso.so.dbg.raw vdso.so.raw
 120 targets += vdso.so.dbg vdso.so
 121 targets += vdso-image.c
 122
 123 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 124
 125 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 126 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 127
 128 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 129
 130 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 131         $(call if_changed,vdsold_and_vdso_check)
 132
 133 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 134                      $(obj)/genvdso FORCE
 135         $(call if_changed,genvdso)
 136
 137 obj-y += vdso-image.o
 138
 139 #
 140 # Build O32 VDSO.
 141 #
 142
 143 # Define these outside the ifdef to ensure they are picked up by clean.
 144 targets += $(obj-vdso-y:%.o=%-o32.o)
 145 targets += vdso-o32.lds
 146 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 147 targets += vdso-o32.so.dbg vdso-o32.so
 148 targets += vdso-o32-image.c
 149
 150 ifdef CONFIG_MIPS32_O32
 151
 152 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 153
 154 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 155 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 156
 157 $(obj)/%-o32.o: $(src)/%.S FORCE
 158         $(call if_changed_dep,vdsoas_o_S)
 159
 160 $(obj)/%-o32.o: $(src)/%.c FORCE
 161         $(call cmd,force_checksrc)
 162         $(call if_changed_rule,cc_o_c)
 163
 164 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 165 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 166         $(call if_changed_dep,cpp_lds_S)
 167
 168 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 169         $(call if_changed,vdsold_and_vdso_check)
 170
 171 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 172 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 173                          $(obj)/genvdso FORCE
 174         $(call if_changed,genvdso)
 175
 176 obj-y += vdso-o32-image.o
 177
 178 endif
 179
 180 #
 181 # Build N32 VDSO.
 182 #
 183
 184 targets += $(obj-vdso-y:%.o=%-n32.o)
 185 targets += vdso-n32.lds
 186 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 187 targets += vdso-n32.so.dbg vdso-n32.so
 188 targets += vdso-n32-image.c
 189
 190 ifdef CONFIG_MIPS32_N32
 191
 192 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 193
 194 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 195 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 196
 197 $(obj)/%-n32.o: $(src)/%.S FORCE
 198         $(call if_changed_dep,vdsoas_o_S)
 199
 200 $(obj)/%-n32.o: $(src)/%.c FORCE
 201         $(call cmd,force_checksrc)
 202         $(call if_changed_rule,cc_o_c)
 203
 204 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 205 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 206         $(call if_changed_dep,cpp_lds_S)
 207
 208 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 209         $(call if_changed,vdsold_and_vdso_check)
 210
 211 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 212 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 213                          $(obj)/genvdso FORCE
 214         $(call if_changed,genvdso)
 215
 216 obj-y += vdso-n32-image.o
 217
 218 endif
 219
 220 # FIXME: Need install rule for debug.
 221 # Needs to deal with dependency for generation of dbg by cmd_genvdso...