LXR linux/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.
   6ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
   7include $(srctree)/lib/vdso/Makefile
   8
   9obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
  10
  11# Common compiler flags between ABIs.
  12ccflags-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
  22ifndef CONFIG_64BIT
  23ccflags-vdso += -DBUILD_VDSO32
  24endif
  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.
  30cflags-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)
  36aflags-vdso := $(ccflags-vdso) \
  37        -D__ASSEMBLY__ -Wa,-gdwarf-2
  38
  39ifneq ($(c-gettimeofday-y),)
  40CFLAGS_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.
  45CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  46CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
  47endif
  48
  49CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
  50
  51ifdef 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))
  56endif
  57
  58# VDSO linker flags.
  59ldflags-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
  63CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
  64
  65GCOV_PROFILE := n
  66UBSAN_SANITIZE := n
  67KCOV_INSTRUMENT := n
  68
  69# Check that we don't have PIC 'jalr t9' calls left
  70quiet_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
  79quiet_cmd_vdsold_and_vdso_check = LD      $@
  80      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
  81
  82quiet_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
  90hostprogs := genvdso
  91
  92quiet_cmd_genvdso = GENVDSO $@
  93define cmd_genvdso
  94        $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  95        $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  96endef
  97
  98#
  99# Build native VDSO.
 100#
 101
 102native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
 103
 104targets += $(obj-vdso-y)
 105targets += vdso.lds
 106targets += vdso.so.dbg.raw vdso.so.raw
 107targets += vdso.so.dbg vdso.so
 108targets += vdso-image.c
 109
 110obj-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
 124obj-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.
 131targets += $(obj-vdso-y:%.o=%-o32.o)
 132targets += vdso-o32.lds
 133targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 134targets += vdso-o32.so.dbg vdso-o32.so
 135targets += vdso-o32-image.c
 136
 137ifdef CONFIG_MIPS32_O32
 138
 139obj-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
 163obj-y += vdso-o32-image.o
 164
 165endif
 166
 167#
 168# Build N32 VDSO.
 169#
 170
 171targets += $(obj-vdso-y:%.o=%-n32.o)
 172targets += vdso-n32.lds
 173targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 174targets += vdso-n32.so.dbg vdso-n32.so
 175targets += vdso-n32-image.c
 176
 177ifdef CONFIG_MIPS32_N32
 178
 179obj-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
 203obj-y += vdso-n32-image.o
 204
 205endif
 206
 207# FIXME: Need install rule for debug.
 208# Needs to deal with dependency for generation of dbg by cmd_genvdso...
 209