1 # SPDX-License-Identifier: GPL-2.0-only
2 # Copied from arch/tile/kernel/vdso/Makefile
4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
5 # the inclusion of generic Makefile.
6 ARCH_REL_TYPE_ABS
:= R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT
7 include $(srctree
)/lib
/vdso
/Makefile
8 # Symbols present in the vdso
9 vdso-syms
= rt_sigreturn
11 vdso-syms
+= vgettimeofday
14 vdso-syms
+= flush_icache
16 # Files to link into the vdso
17 obj-vdso
= $(patsubst %, %.o
, $(vdso-syms
)) note.o
19 ccflags-y
:= -fno-stack-protector
21 ifneq ($(c-gettimeofday-y
),)
22 CFLAGS_vgettimeofday.o
+= -fPIC
-include $(c-gettimeofday-y
)
26 targets
:= $(obj-vdso
) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o
27 obj-vdso
:= $(addprefix $(obj
)/, $(obj-vdso
))
29 obj-y
+= vdso.o vdso-syms.o
30 CPPFLAGS_vdso.lds
+= -P
-C
-U
$(ARCH
)
32 # Disable -pg to prevent insert call site
33 CFLAGS_REMOVE_vgettimeofday.o
= $(CC_FLAGS_FTRACE
) -Os
35 # Disable profiling and instrumentation for VDSO code
41 $(obj
)/vdso.o
: $(obj
)/vdso.so
43 # link rule for the .so file, .lds has to be first
44 $(obj
)/vdso.so.dbg
: $(src
)/vdso.lds
$(obj-vdso
) FORCE
45 $(call if_changed
,vdsold
)
46 LDFLAGS_vdso.so.dbg
= -shared
-s
-soname
=linux-vdso.so
.1 \
47 --build-id
=sha1
--hash-style
=both
--eh-frame-hdr
49 # We also create a special relocatable object that should mirror the symbol
50 # table and layout of the linked DSO. With ld --just-symbols we can then
51 # refer to these symbols in the kernel code rather than hand-coded addresses.
52 $(obj
)/vdso-syms.S
: $(obj
)/vdso.so FORCE
53 $(call if_changed
,so2s
)
55 # strip rule for the .so file
56 $(obj
)/%.so
: OBJCOPYFLAGS
:= -S
57 $(obj
)/%.so
: $(obj
)/%.so.dbg FORCE
58 $(call if_changed
,objcopy
)
60 # actual build commands
61 # The DSO images are built using a special linker script
62 # Make sure only to export the intended __vdso_xxx symbol offsets.
63 quiet_cmd_vdsold
= VDSOLD
$@
64 cmd_vdsold
= $(LD
) $(ld_flags
) -T
$(filter-out FORCE
,$^
) -o
$@.tmp
&& \
65 $(OBJCOPY
) $(patsubst %, -G __vdso_
%, $(vdso-syms
)) $@.tmp
$@
&& \
68 # Extracts symbol offsets from the VDSO, converting them into an assembly file
69 # that contains the same symbols at the same offsets.
70 quiet_cmd_so2s
= SO2S
$@
71 cmd_so2s
= $(NM
) -D
$< |
$(srctree
)/$(src
)/so2s.sh
> $@
73 # install commands for the unstripped file
74 quiet_cmd_vdso_install
= INSTALL
$@
75 cmd_vdso_install
= cp
$(obj
)/$@.dbg
$(MODLIB
)/vdso
/$@
77 vdso.so
: $(obj
)/vdso.so.dbg
78 @mkdir
-p
$(MODLIB
)/vdso
79 $(call cmd
,vdso_install
)