arch/mips/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 # Sanitizer runtimes are unavailable and cannot be linked here.
   5  KCSAN_SANITIZE                 := n
   6
   7 # Include the generic Makefile to check the built vdso.
   8 include $(srctree)/lib/vdso/Makefile
   9
  10 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
  11
  12 # Common compiler flags between ABIs.
  13 ccflags-vdso := \
  14         $(filter -I%,$(KBUILD_CFLAGS)) \
  15         $(filter -E%,$(KBUILD_CFLAGS)) \
  16         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
  17         $(filter -march=%,$(KBUILD_CFLAGS)) \
  18         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  19         $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
  20         $(CLANG_FLAGS) \
  21         -D__VDSO__
  22
  23 ifndef CONFIG_64BIT
  24 ccflags-vdso += -DBUILD_VDSO32
  25 endif
  26
  27 #
  28 # The -fno-jump-tables flag only prevents the compiler from generating
  29 # jump tables but does not prevent the compiler from emitting absolute
  30 # offsets.
  31 cflags-vdso := $(ccflags-vdso) \
  32         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  33         -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  34         -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
  35         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  36         $(call cc-option, -fno-asynchronous-unwind-tables)
  37 aflags-vdso := $(ccflags-vdso) \
  38         -D__ASSEMBLY__ -Wa,-gdwarf-2
  39
  40 ifneq ($(c-gettimeofday-y),)
  41 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
  42
  43 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
  44 # library on a 64bit kernel.
  45 # Note: Needs to be included before than the generic library.
  46 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  47 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  48 endif
  49
  50 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
  51
  52 ifdef CONFIG_MIPS_DISABLE_VDSO
  53   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
  54 endif
  55
  56 # VDSO linker flags.
  57 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  58         $(filter -E%,$(KBUILD_CFLAGS)) -shared \
  59         -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
  60
  61 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
  62
  63 GCOV_PROFILE := n
  64 UBSAN_SANITIZE := n
  65 KCOV_INSTRUMENT := n
  66
  67 # Check that we don't have PIC 'jalr t9' calls left
  68 quiet_cmd_vdso_mips_check = VDSOCHK $@
  69       cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
  70                        then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
  71                              rm -f $@; /bin/false); fi
  72
  73 #
  74 # Shared build commands.
  75 #
  76
  77 quiet_cmd_vdsold_and_vdso_check = LD      $@
  78       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  79
  80 quiet_cmd_vdsoas_o_S = AS      $@
  81       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  82
  83 # Strip rule for the raw .so files
  84 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  85 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  86         $(call if_changed,objcopy)
  87
  88 hostprogs := genvdso
  89
  90 quiet_cmd_genvdso = GENVDSO $@
  91 define cmd_genvdso
  92         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  93         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  94 endef
  95
  96 #
  97 # Build native VDSO.
  98 #
  99
 100 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 101
 102 targets += $(obj-vdso-y)
 103 targets += vdso.lds
 104 targets += vdso.so.dbg.raw vdso.so.raw
 105 targets += vdso.so.dbg vdso.so
 106 targets += vdso-image.c
 107
 108 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
 109
 110 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
 111 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 112
 113 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 114
 115 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
 116         $(call if_changed,vdsold_and_vdso_check)
 117
 118 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
 119                      $(obj)/genvdso FORCE
 120         $(call if_changed,genvdso)
 121
 122 obj-y += vdso-image.o
 123
 124 #
 125 # Build O32 VDSO.
 126 #
 127
 128 # Define these outside the ifdef to ensure they are picked up by clean.
 129 targets += $(obj-vdso-y:%.o=%-o32.o)
 130 targets += vdso-o32.lds
 131 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 132 targets += vdso-o32.so.dbg vdso-o32.so
 133 targets += vdso-o32-image.c
 134
 135 ifdef CONFIG_MIPS32_O32
 136
 137 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 138
 139 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 140 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 141
 142 $(obj)/%-o32.o: $(src)/%.S FORCE
 143         $(call if_changed_dep,vdsoas_o_S)
 144
 145 $(obj)/%-o32.o: $(src)/%.c FORCE
 146         $(call cmd,force_checksrc)
 147         $(call if_changed_rule,cc_o_c)
 148
 149 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 150 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 151         $(call if_changed_dep,cpp_lds_S)
 152
 153 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 154         $(call if_changed,vdsold_and_vdso_check)
 155
 156 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 157 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 158                          $(obj)/genvdso FORCE
 159         $(call if_changed,genvdso)
 160
 161 obj-y += vdso-o32-image.o
 162
 163 endif
 164
 165 #
 166 # Build N32 VDSO.
 167 #
 168
 169 targets += $(obj-vdso-y:%.o=%-n32.o)
 170 targets += vdso-n32.lds
 171 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 172 targets += vdso-n32.so.dbg vdso-n32.so
 173 targets += vdso-n32-image.c
 174
 175 ifdef CONFIG_MIPS32_N32
 176
 177 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 178
 179 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 180 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 181
 182 $(obj)/%-n32.o: $(src)/%.S FORCE
 183         $(call if_changed_dep,vdsoas_o_S)
 184
 185 $(obj)/%-n32.o: $(src)/%.c FORCE
 186         $(call cmd,force_checksrc)
 187         $(call if_changed_rule,cc_o_c)
 188
 189 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 190 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 191         $(call if_changed_dep,cpp_lds_S)
 192
 193 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 194         $(call if_changed,vdsold_and_vdso_check)
 195
 196 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 197 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 198                          $(obj)/genvdso FORCE
 199         $(call if_changed,genvdso)
 200
 201 obj-y += vdso-n32-image.o
 202
 203 endif
 204
 205 # FIXME: Need install rule for debug.
 206 # Needs to deal with dependency for generation of dbg by cmd_genvdso...