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
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
= -m64
-Wl
,-soname
=linux-vdso.so
.1 \
30 -Wl
,-z
,max-page-size
=4096 -Wl
,-z
,common-page-size
=4096
32 $(obj
)/vdso.o
: $(src
)/vdso.S
$(obj
)/vdso.so
34 $(obj
)/vdso.so.dbg
: $(src
)/vdso.lds
$(vobjs
) FORCE
35 $(call if_changed
,vdso
)
37 $(obj
)/%.so
: OBJCOPYFLAGS
:= -S
38 $(obj
)/%.so
: $(obj
)/%.so.dbg FORCE
39 $(call if_changed
,objcopy
)
42 # Don't omit frame pointers for ease of userspace debugging, but do
43 # optimize sibling calls.
45 CFL
:= $(PROFILING
) -mcmodel
=small
-fPIC
-O2
-fasynchronous-unwind-tables
-m64 \
46 $(filter -g
%,$(KBUILD_CFLAGS
)) $(call cc-option
, -fno-stack-protector
) \
47 -fno-omit-frame-pointer
-foptimize-sibling-calls
49 $(vobjs
): KBUILD_CFLAGS
+= $(CFL
)
52 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
54 CFLAGS_REMOVE_vdso-note.o
= -pg
55 CFLAGS_REMOVE_vclock_gettime.o
= -pg
56 CFLAGS_REMOVE_vgetcpu.o
= -pg
57 CFLAGS_REMOVE_vvar.o
= -pg
59 targets
+= vdso-syms.lds
60 obj-
$(VDSO64-y
) += vdso-syms.lds
63 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
65 sed-vdsosym
:= -e
's/^00*/0/' \
66 -e
's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
67 quiet_cmd_vdsosym
= VDSOSYM
$@
69 $(NM
) $< | LC_ALL
=C sed
-n
$(sed-vdsosym
) | LC_ALL
=C
sort > $@
72 $(obj
)/%-syms.lds
: $(obj
)/%.so.dbg FORCE
73 $(call if_changed
,vdsosym
)
76 # Build multiple 32-bit vDSO images to choose from at boot time.
78 obj-
$(VDSO32-y
) += vdso32-syms.lds
79 vdso32.so-
$(VDSO32-y
) += int80
80 vdso32.so-
$(CONFIG_COMPAT
) += syscall
81 vdso32.so-
$(VDSO32-y
) += sysenter
83 vdso32-images
= $(vdso32.so-y
:%=vdso32-
%.so
)
85 CPPFLAGS_vdso32.lds
= $(CPPFLAGS_vdso.lds
)
86 VDSO_LDFLAGS_vdso32.lds
= -m32
-Wl
,-soname
=linux-gate.so
.1
88 # This makes sure the $(obj) subdirectory exists even though vdso32/
89 # is not a kbuild sub-make subdirectory.
90 override obj-dirs
= $(dir $(obj
)) $(obj
)/vdso32
/
92 targets
+= vdso32
/vdso32.lds
93 targets
+= $(vdso32-images
) $(vdso32-images
:=.dbg
)
94 targets
+= vdso32
/note.o
$(vdso32.so-y
:%=vdso32
/%.o
)
96 extra-y
+= $(vdso32-images
)
98 $(obj
)/vdso32.o
: $(vdso32-images
:%=$(obj
)/%)
100 KBUILD_AFLAGS_32
:= $(filter-out -m64
,$(KBUILD_AFLAGS
))
101 $(vdso32-images
:%=$(obj
)/%.dbg
): KBUILD_AFLAGS
= $(KBUILD_AFLAGS_32
)
102 $(vdso32-images
:%=$(obj
)/%.dbg
): asflags-
$(CONFIG_X86_64
) += -m32
104 $(vdso32-images
:%=$(obj
)/%.dbg
): $(obj
)/vdso32-
%.so.dbg
: FORCE \
105 $(obj
)/vdso32
/vdso32.lds \
106 $(obj
)/vdso32
/note.o \
108 $(call if_changed
,vdso
)
110 # Make vdso32-*-syms.lds from each image, and then make sure they match.
111 # The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
113 targets
+= vdso32-syms.lds
$(vdso32.so-y
:%=vdso32-
%-syms.lds
)
115 quiet_cmd_vdso32sym
= VDSOSYM
$@
117 if LC_ALL
=C
sort -u
$(filter-out FORCE
,$^
) > $(@D
)/.tmp_
$(@F
) && \
118 $(foreach H
,$(filter-out FORCE
,$^
),\
119 if grep
-q VDSO32_SYSENTER_RETURN
$H; \
120 then diff
-u
$(@D
)/.tmp_
$(@F
) $H; \
121 else sed
/VDSO32_SYSENTER_RETURN
/d
$(@D
)/.tmp_
$(@F
) | \
122 diff
-u
- $H; fi
&&) : ;\
123 then mv
-f
$(@D
)/.tmp_
$(@F
) $@
; \
124 else rm -f
$(@D
)/.tmp_
$(@F
); exit
1; \
128 $(obj
)/vdso32-syms.lds
: $(vdso32.so-y
:%=$(obj
)/vdso32-
%-syms.lds
) FORCE
129 $(call if_changed
,vdso32sym
)
132 # The DSO images are built using a special linker script.
134 quiet_cmd_vdso
= VDSO
$@
135 cmd_vdso
= $(CC
) -nostdlib
-o
$@ \
136 $(VDSO_LDFLAGS
) $(VDSO_LDFLAGS_
$(filter %.lds
,$(^F
))) \
137 -Wl
,-T
,$(filter %.lds
,$^
) $(filter %.o
,$^
) && \
138 sh
$(srctree
)/$(src
)/checkundef.sh
'$(NM)' '$@'
140 VDSO_LDFLAGS
= -fPIC
-shared
$(call cc-ldoption
, -Wl
$(comma
)--hash-style
=sysv
)
144 # Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
146 quiet_cmd_vdso_install
= INSTALL
$@
147 cmd_vdso_install
= cp
$(obj
)/$@.dbg
$(MODLIB
)/vdso
/$@
148 $(vdso-install-y
): %.so
: $(obj
)/%.so.dbg FORCE
149 @mkdir
-p
$(MODLIB
)/vdso
150 $(call cmd
,vdso_install
)
152 PHONY
+= vdso_install
$(vdso-install-y
)
153 vdso_install
: $(vdso-install-y
)
155 clean-files
:= vdso32-syscall
* vdso32-sysenter
* vdso32-int80
*