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         $(call cc-option, -fno-stack-protector)
  40 aflags-vdso := $(ccflags-vdso) \
  41         -D__ASSEMBLY__ -Wa,-gdwarf-2
  42
  43 ifneq ($(c-gettimeofday-y),)
  44 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
  45
  46 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
  47 # library on a 64bit kernel.
  48 # Note: Needs to be included before than the generic library.
  49 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  50 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  51 endif
  52
  53 CFLAGS_REMOVE_vgettimeofday.o = -pg
  54
  55 ifdef CONFIG_MIPS_DISABLE_VDSO
  56   ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
  57     $(warning MIPS VDSO requires binutils >= 2.25)
  58   endif
  59   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  60 endif
  61
  62 # VDSO linker flags.
  63 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  64         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  65         -G 0 --eh-frame-hdr --hash-style=sysv --build-id -T
  66
  67 CFLAGS_REMOVE_vdso.o = -pg
  68
  69 GCOV_PROFILE := n
  70 UBSAN_SANITIZE := n
  71 KCOV_INSTRUMENT := n
  72
  73 # Check that we don't have PIC 'jalr t9' calls left
  74 quiet_cmd_vdso_mips_check = VDSOCHK $@
  75       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
  76                        then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
  77                              rm -f $@; /bin/false); fi
  78
  79 #
  80 # Shared build commands.
  81 #
  82
  83 quiet_cmd_vdsold_and_vdso_check = LD      $@
  84       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  85
  86 quiet_cmd_vdsoas_o_S = AS      $@
  87       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  88
  89 # Strip rule for the raw .so files
  90 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  91 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  92         $(call if_changed,objcopy)
  93
  94 hostprogs := genvdso
  95
  96 quiet_cmd_genvdso = GENVDSO $@
  97 define cmd_genvdso
  98         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  99         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
 100 endef
 101
 102 #
 103 # Build native VDSO.
 104 #
 105
 106 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 107
 108 targets += $(obj-vdso-y)
 109 targets += vdso.lds
 110 targets += vdso.so.dbg.raw vdso.so.raw
 111 targets += vdso.so.dbg vdso.so
 112 targets += vdso-image.c
 113
 114 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 115
 116 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 117 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 118
 119 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 120
 121 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 122         $(call if_changed,vdsold_and_vdso_check)
 123
 124 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 125                      $(obj)/genvdso FORCE
 126         $(call if_changed,genvdso)
 127
 128 obj-y += vdso-image.o
 129
 130 #
 131 # Build O32 VDSO.
 132 #
 133
 134 # Define these outside the ifdef to ensure they are picked up by clean.
 135 targets += $(obj-vdso-y:%.o=%-o32.o)
 136 targets += vdso-o32.lds
 137 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 138 targets += vdso-o32.so.dbg vdso-o32.so
 139 targets += vdso-o32-image.c
 140
 141 ifdef CONFIG_MIPS32_O32
 142
 143 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 144
 145 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 146 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 147
 148 $(obj)/%-o32.o: $(src)/%.S FORCE
 149         $(call if_changed_dep,vdsoas_o_S)
 150
 151 $(obj)/%-o32.o: $(src)/%.c FORCE
 152         $(call cmd,force_checksrc)
 153         $(call if_changed_rule,cc_o_c)
 154
 155 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 156 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 157         $(call if_changed_dep,cpp_lds_S)
 158
 159 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 160         $(call if_changed,vdsold_and_vdso_check)
 161
 162 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 163 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 164                          $(obj)/genvdso FORCE
 165         $(call if_changed,genvdso)
 166
 167 obj-y += vdso-o32-image.o
 168
 169 endif
 170
 171 #
 172 # Build N32 VDSO.
 173 #
 174
 175 targets += $(obj-vdso-y:%.o=%-n32.o)
 176 targets += vdso-n32.lds
 177 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 178 targets += vdso-n32.so.dbg vdso-n32.so
 179 targets += vdso-n32-image.c
 180
 181 ifdef CONFIG_MIPS32_N32
 182
 183 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 184
 185 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 186 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 187
 188 $(obj)/%-n32.o: $(src)/%.S FORCE
 189         $(call if_changed_dep,vdsoas_o_S)
 190
 191 $(obj)/%-n32.o: $(src)/%.c FORCE
 192         $(call cmd,force_checksrc)
 193         $(call if_changed_rule,cc_o_c)
 194
 195 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 196 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 197         $(call if_changed_dep,cpp_lds_S)
 198
 199 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 200         $(call if_changed,vdsold_and_vdso_check)
 201
 202 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 203 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 204                          $(obj)/genvdso FORCE
 205         $(call if_changed,genvdso)
 206
 207 obj-y += vdso-n32-image.o
 208
 209 endif
 210
 211 # FIXME: Need install rule for debug.
 212 # Needs to deal with dependency for generation of dbg by cmd_genvdso...