2 # Building vDSO images for x86.
5 VDSO64-$(CONFIG_X86_64) := y
6 VDSO32-$(CONFIG_X86_32) := y
7 VDSO32-$(CONFIG_COMPAT) := y
9 vdso-install-$(VDSO64-y) += vdso.so
10 vdso-install-$(VDSO32-y) += $(vdso32-images)
13 # files to link into the vdso
14 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
16 # files to link into kernel
17 obj-$(VDSO64-y) += vma.o vdso.o
18 obj-$(VDSO32-y) += vdso32.o vdso32-setup.o
20 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
22 $(obj)/vdso.o: $(obj)/vdso.so
24 targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
26 export CPPFLAGS_vdso.lds += -P -C
28 VDSO_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
31 $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
33 $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
34 $(call if_changed,vdso)
36 $(obj)/%.so: OBJCOPYFLAGS := -S
37 $(obj)/%.so: $(obj)/%.so.dbg FORCE
38 $(call if_changed,objcopy)
40 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
41 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector)
43 $(vobjs): KBUILD_CFLAGS += $(CFL)
45 targets += vdso-syms.lds
46 obj-$(VDSO64-y) += vdso-syms.lds
49 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
51 sed-vdsosym := -e 's/^00*/0/' \
52 -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
53 quiet_cmd_vdsosym = VDSOSYM $@
55 $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
58 $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
59 $(call if_changed,vdsosym)
62 # Build multiple 32-bit vDSO images to choose from at boot time.
64 obj-$(VDSO32-y) += vdso32-syms.lds
65 vdso32.so-$(VDSO32-y) += int80
66 vdso32.so-$(CONFIG_COMPAT) += syscall
67 vdso32.so-$(VDSO32-y) += sysenter
69 vdso32-images = $(vdso32.so-y:%=vdso32-%.so)
71 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
72 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -Wl,-soname=linux-gate.so.1
74 # This makes sure the $(obj) subdirectory exists even though vdso32/
75 # is not a kbuild sub-make subdirectory.
76 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
78 targets += vdso32/vdso32.lds
79 targets += $(vdso32-images) $(vdso32-images:=.dbg)
80 targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
82 extra-y += $(vdso32-images)
84 $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
86 KBUILD_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
90 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
91 $(obj)/vdso32/vdso32.lds \
92 $(obj)/vdso32/note.o \
94 $(call if_changed,vdso)
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.
99 targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds)
101 quiet_cmd_vdso32sym = VDSOSYM $@
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; \
114 $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
115 $(call if_changed,vdso32sym)
118 # The DSO images are built using a special linker script.
120 quiet_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 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
126 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
130 # Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
132 quiet_cmd_vdso_install = INSTALL $@
133 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
134 $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
135 @mkdir -p $(MODLIB)/vdso
136 $(call cmd,vdso_install)
138 PHONY += vdso_install $(vdso-install-y)
139 vdso_install: $(vdso-install-y)
141 clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*