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         -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
  37         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  38         $(call cc-option, -fno-asynchronous-unwind-tables)
  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 ifdef CONFIG_MIPS_DISABLE_VDSO
  55   ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
  56     $(warning MIPS VDSO requires binutils >= 2.25)
  57   endif
  58   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  59 endif
  60
  61 # VDSO linker flags.
  62 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  63         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  64         -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
  65
  66 CFLAGS_REMOVE_vdso.o = -pg
  67
  68 GCOV_PROFILE := n
  69 UBSAN_SANITIZE := n
  70 KCOV_INSTRUMENT := n
  71
  72 # Check that we don't have PIC 'jalr t9' calls left
  73 quiet_cmd_vdso_mips_check = VDSOCHK $@
  74       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
  75                        then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
  76                              rm -f $@; /bin/false); fi
  77
  78 #
  79 # Shared build commands.
  80 #
  81
  82 quiet_cmd_vdsold_and_vdso_check = LD      $@
  83       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  84
  85 quiet_cmd_vdsoas_o_S = AS      $@
  86       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  87
  88 # Strip rule for the raw .so files
  89 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  90 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  91         $(call if_changed,objcopy)
  92
  93 hostprogs := genvdso
  94
  95 quiet_cmd_genvdso = GENVDSO $@
  96 define cmd_genvdso
  97         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  98         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  99 endef
 100
 101 #
 102 # Build native VDSO.
 103 #
 104
 105 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 106
 107 targets += $(obj-vdso-y)
 108 targets += vdso.lds
 109 targets += vdso.so.dbg.raw vdso.so.raw
 110 targets += vdso.so.dbg vdso.so
 111 targets += vdso-image.c
 112
 113 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 114
 115 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 116 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 117
 118 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 119
 120 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 121         $(call if_changed,vdsold_and_vdso_check)
 122
 123 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 124                      $(obj)/genvdso FORCE
 125         $(call if_changed,genvdso)
 126
 127 obj-y += vdso-image.o
 128
 129 #
 130 # Build O32 VDSO.
 131 #
 132
 133 # Define these outside the ifdef to ensure they are picked up by clean.
 134 targets += $(obj-vdso-y:%.o=%-o32.o)
 135 targets += vdso-o32.lds
 136 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 137 targets += vdso-o32.so.dbg vdso-o32.so
 138 targets += vdso-o32-image.c
 139
 140 ifdef CONFIG_MIPS32_O32
 141
 142 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 143
 144 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 145 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 146
 147 $(obj)/%-o32.o: $(src)/%.S FORCE
 148         $(call if_changed_dep,vdsoas_o_S)
 149
 150 $(obj)/%-o32.o: $(src)/%.c FORCE
 151         $(call cmd,force_checksrc)
 152         $(call if_changed_rule,cc_o_c)
 153
 154 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 155 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 156         $(call if_changed_dep,cpp_lds_S)
 157
 158 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 159         $(call if_changed,vdsold_and_vdso_check)
 160
 161 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 162 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 163                          $(obj)/genvdso FORCE
 164         $(call if_changed,genvdso)
 165
 166 obj-y += vdso-o32-image.o
 167
 168 endif
 169
 170 #
 171 # Build N32 VDSO.
 172 #
 173
 174 targets += $(obj-vdso-y:%.o=%-n32.o)
 175 targets += vdso-n32.lds
 176 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 177 targets += vdso-n32.so.dbg vdso-n32.so
 178 targets += vdso-n32-image.c
 179
 180 ifdef CONFIG_MIPS32_N32
 181
 182 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 183
 184 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 185 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 186
 187 $(obj)/%-n32.o: $(src)/%.S FORCE
 188         $(call if_changed_dep,vdsoas_o_S)
 189
 190 $(obj)/%-n32.o: $(src)/%.c FORCE
 191         $(call cmd,force_checksrc)
 192         $(call if_changed_rule,cc_o_c)
 193
 194 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 195 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 196         $(call if_changed_dep,cpp_lds_S)
 197
 198 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 199         $(call if_changed,vdsold_and_vdso_check)
 200
 201 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 202 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 203                          $(obj)/genvdso FORCE
 204         $(call if_changed,genvdso)
 205
 206 obj-y += vdso-n32-image.o
 207
 208 endif
 209
 210 # FIXME: Need install rule for debug.
 211 # Needs to deal with dependency for generation of dbg by cmd_genvdso...