arch/mips/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
   4
   5 # Common compiler flags between ABIs.
   6 ccflags-vdso := \
   7         $(filter -I%,$(KBUILD_CFLAGS)) \
   8         $(filter -E%,$(KBUILD_CFLAGS)) \
   9         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
  10         $(filter -march=%,$(KBUILD_CFLAGS))
  11 cflags-vdso := $(ccflags-vdso) \
  12         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  13         -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
  14         -DDISABLE_BRANCH_PROFILING \
  15         $(call cc-option, -fno-asynchronous-unwind-tables) \
  16         $(call cc-option, -fno-stack-protector)
  17 aflags-vdso := $(ccflags-vdso) \
  18         -D__ASSEMBLY__ -Wa,-gdwarf-2
  19
  20 #
  21 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
  22 # the base address of VDSO, the linker will emit a R_MIPS_PC32
  23 # relocation in binutils > 2.25 but it will fail with older versions
  24 # because that relocation is not supported for that symbol. As a result
  25 # of which we are forced to disable the VDSO symbols when building
  26 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
  27 # can't use other methods to get the base address of VDSO please refer to
  28 # the comments on that file.
  29 #
  30 ifndef CONFIG_CPU_MIPSR6
  31   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
  32     $(warning MIPS VDSO requires binutils >= 2.25)
  33     obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
  34     ccflags-vdso += -DDISABLE_MIPS_VDSO
  35   endif
  36 endif
  37
  38 # VDSO linker flags.
  39 VDSO_LDFLAGS := \
  40         -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
  41         -nostdlib -shared \
  42         $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
  43         $(call cc-ldoption, -Wl$(comma)--build-id)
  44
  45 GCOV_PROFILE := n
  46
  47 #
  48 # Shared build commands.
  49 #
  50
  51 quiet_cmd_vdsold = VDSO    $@
  52       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  53                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  54
  55 quiet_cmd_vdsoas_o_S = AS       $@
  56       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  57
  58 # Strip rule for the raw .so files
  59 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
  60 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
  61         $(call if_changed,objcopy)
  62
  63 hostprogs-y := genvdso
  64
  65 quiet_cmd_genvdso = GENVDSO $@
  66 define cmd_genvdso
  67         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
  68         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
  69 endef
  70
  71 #
  72 # Build native VDSO.
  73 #
  74
  75 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  76
  77 targets += $(obj-vdso-y)
  78 targets += vdso.lds
  79 targets += vdso.so.dbg.raw vdso.so.raw
  80 targets += vdso.so.dbg vdso.so
  81 targets += vdso-image.c
  82
  83 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  84
  85 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  86 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  87
  88 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  89
  90 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  91         $(call if_changed,vdsold)
  92
  93 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
  94                      $(obj)/genvdso FORCE
  95         $(call if_changed,genvdso)
  96
  97 obj-y += vdso-image.o
  98
  99 #
 100 # Build O32 VDSO.
 101 #
 102
 103 # Define these outside the ifdef to ensure they are picked up by clean.
 104 targets += $(obj-vdso-y:%.o=%-o32.o)
 105 targets += vdso-o32.lds
 106 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
 107 targets += vdso-o32.so.dbg vdso-o32.so
 108 targets += vdso-o32-image.c
 109
 110 ifdef CONFIG_MIPS32_O32
 111
 112 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
 113
 114 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
 115 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
 116
 117 $(obj)/%-o32.o: $(src)/%.S FORCE
 118         $(call if_changed_dep,vdsoas_o_S)
 119
 120 $(obj)/%-o32.o: $(src)/%.c FORCE
 121         $(call cmd,force_checksrc)
 122         $(call if_changed_rule,cc_o_c)
 123
 124 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
 125 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 126         $(call if_changed_dep,cpp_lds_S)
 127
 128 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
 129         $(call if_changed,vdsold)
 130
 131 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
 132 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
 133                          $(obj)/genvdso FORCE
 134         $(call if_changed,genvdso)
 135
 136 obj-y += vdso-o32-image.o
 137
 138 endif
 139
 140 #
 141 # Build N32 VDSO.
 142 #
 143
 144 targets += $(obj-vdso-y:%.o=%-n32.o)
 145 targets += vdso-n32.lds
 146 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
 147 targets += vdso-n32.so.dbg vdso-n32.so
 148 targets += vdso-n32-image.c
 149
 150 ifdef CONFIG_MIPS32_N32
 151
 152 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
 153
 154 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
 155 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
 156
 157 $(obj)/%-n32.o: $(src)/%.S FORCE
 158         $(call if_changed_dep,vdsoas_o_S)
 159
 160 $(obj)/%-n32.o: $(src)/%.c FORCE
 161         $(call cmd,force_checksrc)
 162         $(call if_changed_rule,cc_o_c)
 163
 164 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
 165 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 166         $(call if_changed_dep,cpp_lds_S)
 167
 168 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
 169         $(call if_changed,vdsold)
 170
 171 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
 172 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
 173                          $(obj)/genvdso FORCE
 174         $(call if_changed,genvdso)
 175
 176 obj-y += vdso-n32-image.o
 177
 178 endif
 179
 180 # FIXME: Need install rule for debug.
 181 # Needs to deal with dependency for generation of dbg by cmd_genvdso...