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-y
:=.so
)
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 # The DSO images are built using a special linker script.
27 quiet_cmd_syscall
= SYSCALL
$@
28 cmd_syscall
= $(CC
) -m elf_x86_64
-nostdlib
$(SYSCFLAGS_
$(@F
)) \
29 -Wl
,-T
,$(filter-out FORCE
,$^
) -o
$@
31 export CPPFLAGS_vdso.lds
+= -P
-C
33 vdso-flags
= -fPIC
-shared
-Wl
,-soname
=linux-vdso.so
.1 \
34 $(call ld-option
, -Wl
$(comma
)--hash-style
=sysv
) \
35 -Wl
,-z
,max-page-size
=4096 -Wl
,-z
,common-page-size
=4096
36 SYSCFLAGS_vdso.so
= $(vdso-flags
)
37 SYSCFLAGS_vdso.so.dbg
= $(vdso-flags
)
39 $(obj
)/vdso.o
: $(src
)/vdso.S
$(obj
)/vdso.so
41 $(obj
)/vdso.so
: $(src
)/vdso.lds
$(vobjs
) FORCE
43 $(obj
)/vdso.so.dbg
: $(src
)/vdso.lds
$(vobjs
) FORCE
44 $(call if_changed
,syscall
)
46 $(obj
)/%.so
: OBJCOPYFLAGS
:= -S
47 $(obj
)/%.so
: $(obj
)/%.so.dbg FORCE
48 $(call if_changed
,objcopy
)
50 CFL
:= $(PROFILING
) -mcmodel
=small
-fPIC
-g0
-O2
-fasynchronous-unwind-tables
-m64
52 $(obj
)/vclock_gettime.o
: KBUILD_CFLAGS
= $(CFL
)
53 $(obj
)/vgetcpu.o
: KBUILD_CFLAGS
= $(CFL
)
55 targets
+= vdso-syms.lds
56 obj-
$(VDSO64-y
) += vdso-syms.lds
59 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
61 sed-vdsosym
:= -e
's/^00*/0/' \
62 -e
's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
63 quiet_cmd_vdsosym
= VDSOSYM
$@
64 cmd_vdsosym
= $(NM
) $< | sed
-n
$(sed-vdsosym
) | LC_ALL
=C
sort > $@
66 $(obj
)/%-syms.lds
: $(obj
)/%.so.dbg FORCE
67 $(call if_changed
,vdsosym
)
70 # Build multiple 32-bit vDSO images to choose from at boot time.
72 obj-
$(VDSO32-y
) += vdso32-syms.lds
73 vdso32.so-
$(CONFIG_X86_32
) += int80
74 vdso32.so-
$(CONFIG_COMPAT
) += syscall
75 vdso32.so-
$(VDSO32-y
) += sysenter
77 CPPFLAGS_vdso32.lds
= $(CPPFLAGS_vdso.lds
)
78 VDSO_LDFLAGS_vdso32.lds
= -m elf_i386
-Wl
,-soname
=linux-gate.so
.1
80 # This makes sure the $(obj) subdirectory exists even though vdso32/
81 # is not a kbuild sub-make subdirectory.
82 override obj-dirs
= $(dir $(obj
)) $(obj
)/vdso32
/
84 targets
+= vdso32
/vdso32.lds
85 targets
+= $(vdso32.so-y
:%=vdso32-
%.so.dbg
) $(vdso32.so-y
:%=vdso32-
%.so
)
86 targets
+= vdso32
/note.o
$(vdso32.so-y
:%=vdso32
/%.o
)
88 extra-y
+= $(vdso32.so-y
:%=vdso32-
%.so
)
90 $(obj
)/vdso32.o
: $(vdso32.so-y
:%=$(obj
)/vdso32-
%.so
)
92 KBUILD_AFLAGS_32
:= $(filter-out -m64
,$(KBUILD_AFLAGS
))
93 $(vdso32.so-y
:%=$(obj
)/vdso32-
%.so.dbg
): KBUILD_AFLAGS
= $(KBUILD_AFLAGS_32
)
94 $(vdso32.so-y
:%=$(obj
)/vdso32-
%.so.dbg
): asflags-
$(CONFIG_X86_64
) += -m32
96 $(vdso32.so-y
:%=$(obj
)/vdso32-
%.so.dbg
): $(obj
)/vdso32-
%.so.dbg
: FORCE \
97 $(obj
)/vdso32
/vdso32.lds \
98 $(obj
)/vdso32
/note.o \
100 $(call if_changed
,vdso
)
102 # Make vdso32-*-syms.lds from each image, and then make sure they match.
103 # The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
105 targets
+= vdso32-syms.lds
$(vdso32.so-y
:%=vdso32-
%-syms.lds
)
107 quiet_cmd_vdso32sym
= VDSOSYM
$@
109 if LC_ALL
=C
sort -u
$(filter-out FORCE
,$^
) > $(@D
)/.tmp_
$(@F
) && \
110 $(foreach H
,$(filter-out FORCE
,$^
),\
111 if grep
-q VDSO32_SYSENTER_RETURN
$H; \
112 then diff
-u
$(@D
)/.tmp_
$(@F
) $H; \
113 else sed
/VDSO32_SYSENTER_RETURN
/d
$(@D
)/.tmp_
$(@F
) | \
114 diff
-u
- $H; fi
&&) : ;\
115 then mv
-f
$(@D
)/.tmp_
$(@F
) $@
; \
116 else rm -f
$(@D
)/.tmp_
$(@F
); exit
1; \
120 $(obj
)/vdso32-syms.lds
: $(vdso32.so-y
:%=$(obj
)/vdso32-
%-syms.lds
) FORCE
121 $(call if_changed
,vdso32sym
)
124 # The DSO images are built using a special linker script.
126 quiet_cmd_vdso
= VDSO
$@
127 cmd_vdso
= $(CC
) -nostdlib
-o
$@ \
128 $(VDSO_LDFLAGS
) $(VDSO_LDFLAGS_
$(filter %.lds
,$(^F
))) \
129 -Wl
,-T
,$(filter %.lds
,$^
) $(filter %.o
,$^
)
131 VDSO_LDFLAGS
= -fPIC
-shared
$(call ld-option
, -Wl
$(comma
)--hash-style
=sysv
)
134 # Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
136 quiet_cmd_vdso_install
= INSTALL
$@
137 cmd_vdso_install
= cp
$(obj
)/$@.dbg
$(MODLIB
)/vdso
/$@
138 $(vdso-install-y
): %.so
: $(obj
)/%.so.dbg FORCE
139 @mkdir
-p
$(MODLIB
)/vdso
140 $(call cmd
,vdso_install
)
142 PHONY
+= vdso_install
$(vdso-install-y
)
143 vdso_install
: $(vdso-install-y
)