5 # files to link into the vdso
6 # vdso-start.o has to be first
7 vobjs-y
:= vdso-start.o vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
9 # files to link into kernel
10 obj-y
:= vma.o vdso.o vdso-syms.o
12 vobjs
:= $(foreach F
,$(vobjs-y
),$(obj
)/$F)
14 $(obj
)/vdso.o
: $(obj
)/vdso.so
16 targets
+= vdso.so vdso.lds
$(vobjs-y
) vdso-syms.o
18 # The DSO images are built using a special linker script.
19 quiet_cmd_syscall
= SYSCALL
$@
20 cmd_syscall
= $(CC
) -m elf_x86_64
-nostdlib
$(SYSCFLAGS_
$(@F
)) \
21 -Wl
,-T
,$(filter-out FORCE
,$^
) -o
$@
23 export CPPFLAGS_vdso.lds
+= -P
-C
-U
$(ARCH
)
25 vdso-flags
= -fPIC
-shared
-Wl
,-soname
=linux-vdso.so
.1 \
26 $(call ld-option
, -Wl
$(comma
)--hash-style
=sysv
) \
27 -Wl
,-z
,max-page-size
=4096 -Wl
,-z
,common-page-size
=4096
28 SYSCFLAGS_vdso.so
= $(vdso-flags
)
30 $(obj
)/vdso.o
: $(src
)/vdso.S
$(obj
)/vdso.so
32 $(obj
)/vdso.so
: $(src
)/vdso.lds
$(vobjs
) FORCE
33 $(call if_changed
,syscall
)
35 CFL
:= $(PROFILING
) -mcmodel
=small
-fPIC
-g0
-O2
-fasynchronous-unwind-tables
-m64
37 $(obj
)/vclock_gettime.o
: CFLAGS
= $(CFL
)
38 $(obj
)/vgetcpu.o
: CFLAGS
= $(CFL
)
40 # We also create a special relocatable object that should mirror the symbol
41 # table and layout of the linked DSO. With ld -R we can then refer to
42 # these symbols in the kernel code rather than hand-coded addresses.
43 extra-y
+= vdso-syms.o
44 $(obj
)/built-in.o
: $(obj
)/vdso-syms.o
45 $(obj
)/built-in.o
: ld_flags
+= -R
$(obj
)/vdso-syms.o
47 SYSCFLAGS_vdso-syms.o
= -r
-d
48 $(obj
)/vdso-syms.o
: $(src
)/vdso.lds
$(vobjs
) FORCE
49 $(call if_changed
,syscall
)
