arch/mips/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 # Include the generic Makefile to check the built vdso.
   5 include $(srctree)/lib/vdso/Makefile
   6
   7 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
   8
   9 # Common compiler flags between ABIs.
  10 ccflags-vdso := \
  11         $(filter -I%,$(KBUILD_CFLAGS)) \
  12         $(filter -E%,$(KBUILD_CFLAGS)) \
  13         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
  14         $(filter -march=%,$(KBUILD_CFLAGS)) \
  15         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  16         $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
  17         $(CLANG_FLAGS) \
  18         -D__VDSO__
  19
  20 ifndef CONFIG_64BIT
  21 ccflags-vdso += -DBUILD_VDSO32
  22 endif
  23
  24 #
  25 # The -fno-jump-tables flag only prevents the compiler from generating
  26 # jump tables but does not prevent the compiler from emitting absolute
  27 # offsets.
  28 cflags-vdso := $(ccflags-vdso) \
  29         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  30         -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  31         -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
  32         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  33         $(call cc-option, -fno-asynchronous-unwind-tables)
  34 aflags-vdso := $(ccflags-vdso) \
  35         -D__ASSEMBLY__ -Wa,-gdwarf-2
  36
  37 ifneq ($(c-gettimeofday-y),)
  38 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
  39
  40 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
  41 # library on a 64bit kernel.
  42 # Note: Needs to be included before than the generic library.
  43 CFLAGS_vgettimeofday-o32.o = -include $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  44 CFLAGS_vgettimeofday-n32.o = -include $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  45 endif
  46
  47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
  48
  49 ifdef CONFIG_MIPS_DISABLE_VDSO
  50   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  51 endif
  52
  53 # VDSO linker flags.
  54 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  55         $(filter -E%,$(KBUILD_CFLAGS)) -shared \
  56         -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
  57
  58 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
  59
  60 # Check that we don't have PIC 'jalr t9' calls left
  61 quiet_cmd_vdso_mips_check = VDSOCHK $@
  62       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
  63                        then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
  64                              rm -f $@; /bin/false); fi
  65
  66 #
  67 # Shared build commands.
  68 #
  69
  70 quiet_cmd_vdsold_and_vdso_check = LD      $@
  71       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  72
  73 quiet_cmd_vdsoas_o_S = AS      $@
  74       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  75
  76 # Strip rule for the raw .so files
  77 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  78 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  79         $(call if_changed,objcopy)
  80
  81 hostprogs := genvdso
  82
  83 quiet_cmd_genvdso = GENVDSO $@
  84 define cmd_genvdso
  85         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  86         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  87 endef
  88
  89 #
  90 # Build native VDSO.
  91 #
  92
  93 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  94
  95 targets += $(obj-vdso-y)
  96 targets += vdso.lds
  97 targets += vdso.so.dbg.raw vdso.so.raw
  98 targets += vdso.so.dbg vdso.so
  99 targets += vdso-image.c
 100
 101 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 102
 103 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 104 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 105
 106 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 107
 108 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 109         $(call if_changed,vdsold_and_vdso_check)
 110
 111 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 112                      $(obj)/genvdso FORCE
 113         $(call if_changed,genvdso)
 114
 115 obj-y += vdso-image.o
 116
 117 #
 118 # Build O32 VDSO.
 119 #
 120
 121 # Define these outside the ifdef to ensure they are picked up by clean.
 122 targets += $(obj-vdso-y:%.o=%-o32.o)
 123 targets += vdso-o32.lds
 124 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 125 targets += vdso-o32.so.dbg vdso-o32.so
 126 targets += vdso-o32-image.c
 127
 128 ifdef CONFIG_MIPS32_O32
 129
 130 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 131
 132 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 133 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 134
 135 $(obj)/%-o32.o: $(src)/%.S FORCE
 136         $(call if_changed_dep,vdsoas_o_S)
 137
 138 $(obj)/%-o32.o: $(src)/%.c FORCE
 139         $(call cmd,force_checksrc)
 140         $(call if_changed_rule,cc_o_c)
 141
 142 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 143 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 144         $(call if_changed_dep,cpp_lds_S)
 145
 146 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 147         $(call if_changed,vdsold_and_vdso_check)
 148
 149 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 150 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 151                          $(obj)/genvdso FORCE
 152         $(call if_changed,genvdso)
 153
 154 obj-y += vdso-o32-image.o
 155
 156 endif
 157
 158 #
 159 # Build N32 VDSO.
 160 #
 161
 162 targets += $(obj-vdso-y:%.o=%-n32.o)
 163 targets += vdso-n32.lds
 164 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 165 targets += vdso-n32.so.dbg vdso-n32.so
 166 targets += vdso-n32-image.c
 167
 168 ifdef CONFIG_MIPS32_N32
 169
 170 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 171
 172 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 173 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 174
 175 $(obj)/%-n32.o: $(src)/%.S FORCE
 176         $(call if_changed_dep,vdsoas_o_S)
 177
 178 $(obj)/%-n32.o: $(src)/%.c FORCE
 179         $(call cmd,force_checksrc)
 180         $(call if_changed_rule,cc_o_c)
 181
 182 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 183 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 184         $(call if_changed_dep,cpp_lds_S)
 185
 186 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 187         $(call if_changed,vdsold_and_vdso_check)
 188
 189 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 190 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 191                          $(obj)/genvdso FORCE
 192         $(call if_changed,genvdso)
 193
 194 obj-y += vdso-n32-image.o
 195
 196 endif
 197
 198 # FIXME: Need install rule for debug.
 199 # Needs to deal with dependency for generation of dbg by cmd_genvdso...