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         $(CLANG_FLAGS) \
  20         -D__VDSO__
  21
  22 ifndef CONFIG_64BIT
  23 ccflags-vdso += -DBUILD_VDSO32
  24 endif
  25
  26 #
  27 # The -fno-jump-tables flag only prevents the compiler from generating
  28 # jump tables but does not prevent the compiler from emitting absolute
  29 # offsets.
  30 cflags-vdso := $(ccflags-vdso) \
  31         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  32         -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  33         -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
  34         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  35         $(call cc-option, -fno-asynchronous-unwind-tables)
  36 aflags-vdso := $(ccflags-vdso) \
  37         -D__ASSEMBLY__ -Wa,-gdwarf-2
  38
  39 ifneq ($(c-gettimeofday-y),)
  40 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
  41
  42 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
  43 # library on a 64bit kernel.
  44 # Note: Needs to be included before than the generic library.
  45 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  46 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  47 endif
  48
  49 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
  50
  51 ifdef CONFIG_MIPS_DISABLE_VDSO
  52   ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
  53     $(warning MIPS VDSO requires binutils >= 2.25)
  54   endif
  55   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  56 endif
  57
  58 # VDSO linker flags.
  59 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  60         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  61         -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
  62
  63 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
  64
  65 GCOV_PROFILE := n
  66 UBSAN_SANITIZE := n
  67 KCOV_INSTRUMENT := n
  68
  69 # Check that we don't have PIC 'jalr t9' calls left
  70 quiet_cmd_vdso_mips_check = VDSOCHK $@
  71       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
  72                        then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
  73                              rm -f $@; /bin/false); fi
  74
  75 #
  76 # Shared build commands.
  77 #
  78
  79 quiet_cmd_vdsold_and_vdso_check = LD      $@
  80       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  81
  82 quiet_cmd_vdsoas_o_S = AS      $@
  83       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  84
  85 # Strip rule for the raw .so files
  86 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  87 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  88         $(call if_changed,objcopy)
  89
  90 hostprogs := genvdso
  91
  92 quiet_cmd_genvdso = GENVDSO $@
  93 define cmd_genvdso
  94         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  95         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  96 endef
  97
  98 #
  99 # Build native VDSO.
 100 #
 101
 102 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 103
 104 targets += $(obj-vdso-y)
 105 targets += vdso.lds
 106 targets += vdso.so.dbg.raw vdso.so.raw
 107 targets += vdso.so.dbg vdso.so
 108 targets += vdso-image.c
 109
 110 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 111
 112 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 113 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 114
 115 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 116
 117 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 118         $(call if_changed,vdsold_and_vdso_check)
 119
 120 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 121                      $(obj)/genvdso FORCE
 122         $(call if_changed,genvdso)
 123
 124 obj-y += vdso-image.o
 125
 126 #
 127 # Build O32 VDSO.
 128 #
 129
 130 # Define these outside the ifdef to ensure they are picked up by clean.
 131 targets += $(obj-vdso-y:%.o=%-o32.o)
 132 targets += vdso-o32.lds
 133 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 134 targets += vdso-o32.so.dbg vdso-o32.so
 135 targets += vdso-o32-image.c
 136
 137 ifdef CONFIG_MIPS32_O32
 138
 139 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 140
 141 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 142 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 143
 144 $(obj)/%-o32.o: $(src)/%.S FORCE
 145         $(call if_changed_dep,vdsoas_o_S)
 146
 147 $(obj)/%-o32.o: $(src)/%.c FORCE
 148         $(call cmd,force_checksrc)
 149         $(call if_changed_rule,cc_o_c)
 150
 151 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 152 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 153         $(call if_changed_dep,cpp_lds_S)
 154
 155 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 156         $(call if_changed,vdsold_and_vdso_check)
 157
 158 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 159 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 160                          $(obj)/genvdso FORCE
 161         $(call if_changed,genvdso)
 162
 163 obj-y += vdso-o32-image.o
 164
 165 endif
 166
 167 #
 168 # Build N32 VDSO.
 169 #
 170
 171 targets += $(obj-vdso-y:%.o=%-n32.o)
 172 targets += vdso-n32.lds
 173 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 174 targets += vdso-n32.so.dbg vdso-n32.so
 175 targets += vdso-n32-image.c
 176
 177 ifdef CONFIG_MIPS32_N32
 178
 179 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 180
 181 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 182 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 183
 184 $(obj)/%-n32.o: $(src)/%.S FORCE
 185         $(call if_changed_dep,vdsoas_o_S)
 186
 187 $(obj)/%-n32.o: $(src)/%.c FORCE
 188         $(call cmd,force_checksrc)
 189         $(call if_changed_rule,cc_o_c)
 190
 191 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 192 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 193         $(call if_changed_dep,cpp_lds_S)
 194
 195 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 196         $(call if_changed,vdsold_and_vdso_check)
 197
 198 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 199 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 200                          $(obj)/genvdso FORCE
 201         $(call if_changed,genvdso)
 202
 203 obj-y += vdso-n32-image.o
 204
 205 endif
 206
 207 # FIXME: Need install rule for debug.
 208 # Needs to deal with dependency for generation of dbg by cmd_genvdso...