linux/arch/x86/vdso/Makefile
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   1#
   2# Building vDSO images for x86.
   3#
   4
   5VDSO64-$(CONFIG_X86_64)         := y
   6VDSO32-$(CONFIG_X86_32)         := y
   7VDSO32-$(CONFIG_COMPAT)         := y
   8
   9vdso-install-$(VDSO64-y)        += vdso.so
  10vdso-install-$(VDSO32-y)        += $(vdso32-images)
  11
  12
  13# files to link into the vdso
  14vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
  15
  16# files to link into kernel
  17obj-$(VDSO64-y)                 += vma.o vdso.o
  18obj-$(VDSO32-y)                 += vdso32.o vdso32-setup.o
  19
  20vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
  21
  22$(obj)/vdso.o: $(obj)/vdso.so
  23
  24targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
  25
  26export CPPFLAGS_vdso.lds += -P -C
  27
  28VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -Wl,-soname=linux-vdso.so.1 \
  29                        -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
  30
  31$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
  32
  33$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
  34        $(call if_changed,vdso)
  35
  36$(obj)/%.so: OBJCOPYFLAGS := -S
  37$(obj)/%.so: $(obj)/%.so.dbg FORCE
  38        $(call if_changed,objcopy)
  39
  40CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
  41       $(filter -g%,$(KBUILD_CFLAGS))
  42
  43$(vobjs): KBUILD_CFLAGS += $(CFL)
  44
  45targets += vdso-syms.lds
  46obj-$(VDSO64-y)                 += vdso-syms.lds
  47
  48#
  49# Match symbols in the DSO that look like VDSO*; produce a file of constants.
  50#
  51sed-vdsosym := -e 's/^00*/0/' \
  52        -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
  53quiet_cmd_vdsosym = VDSOSYM $@
  54define cmd_vdsosym
  55        $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
  56endef
  57
  58$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
  59        $(call if_changed,vdsosym)
  60
  61#
  62# Build multiple 32-bit vDSO images to choose from at boot time.
  63#
  64obj-$(VDSO32-y)                 += vdso32-syms.lds
  65vdso32.so-$(VDSO32-y)           += int80
  66vdso32.so-$(CONFIG_COMPAT)      += syscall
  67vdso32.so-$(VDSO32-y)           += sysenter
  68
  69vdso32-images                   = $(vdso32.so-y:%=vdso32-%.so)
  70
  71CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
  72VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -Wl,-soname=linux-gate.so.1
  73
  74# This makes sure the $(obj) subdirectory exists even though vdso32/
  75# is not a kbuild sub-make subdirectory.
  76override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
  77
  78targets += vdso32/vdso32.lds
  79targets += $(vdso32-images) $(vdso32-images:=.dbg)
  80targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
  81
  82extra-y += $(vdso32-images)
  83
  84$(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
  85
  86KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
  87$(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
  88$(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32
  89
  90$(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
  91                                 $(obj)/vdso32/vdso32.lds \
  92                                 $(obj)/vdso32/note.o \
  93                                 $(obj)/vdso32/%.o
  94        $(call if_changed,vdso)
  95
  96# Make vdso32-*-syms.lds from each image, and then make sure they match.
  97# The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
  98
  99targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds)
 100
 101quiet_cmd_vdso32sym = VDSOSYM $@
 102define cmd_vdso32sym
 103        if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \
 104           $(foreach H,$(filter-out FORCE,$^),\
 105                     if grep -q VDSO32_SYSENTER_RETURN $H; \
 106                     then diff -u $(@D)/.tmp_$(@F) $H; \
 107                     else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \
 108                          diff -u - $H; fi &&) : ;\
 109        then mv -f $(@D)/.tmp_$(@F) $@; \
 110        else rm -f $(@D)/.tmp_$(@F); exit 1; \
 111        fi
 112endef
 113
 114$(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
 115        $(call if_changed,vdso32sym)
 116
 117#
 118# The DSO images are built using a special linker script.
 119#
 120quiet_cmd_vdso = VDSO    $@
 121      cmd_vdso = $(CC) -nostdlib -o $@ \
 122                       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
 123                       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
 124
 125VDSO_LDFLAGS = -fPIC -shared $(call ld-option, -Wl$(comma)--hash-style=sysv)
 126
 127#
 128# Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
 129#
 130quiet_cmd_vdso_install = INSTALL $@
 131      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
 132$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
 133        @mkdir -p $(MODLIB)/vdso
 134        $(call cmd,vdso_install)
 135
 136PHONY += vdso_install $(vdso-install-y)
 137vdso_install: $(vdso-install-y)
 138
 139clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*
 140