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2aae950b AK |
1 | # |
2 | # x86-64 vDSO. | |
3 | # | |
4 | ||
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 | |
8 | ||
9 | # files to link into kernel | |
10 | obj-y := vma.o vdso.o vdso-syms.o | |
11 | ||
12 | vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) | |
13 | ||
14 | $(obj)/vdso.o: $(obj)/vdso.so | |
15 | ||
f79eb83b | 16 | targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) vdso-syms.o |
2aae950b AK |
17 | |
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 $@ | |
22 | ||
d746d647 | 23 | export CPPFLAGS_vdso.lds += -P -C |
2aae950b AK |
24 | |
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) | |
f79eb83b | 29 | SYSCFLAGS_vdso.so.dbg = $(vdso-flags) |
2aae950b AK |
30 | |
31 | $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so | |
32 | ||
33 | $(obj)/vdso.so: $(src)/vdso.lds $(vobjs) FORCE | |
f79eb83b RM |
34 | |
35 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE | |
2aae950b AK |
36 | $(call if_changed,syscall) |
37 | ||
f79eb83b RM |
38 | $(obj)/%.so: OBJCOPYFLAGS := -S |
39 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
40 | $(call if_changed,objcopy) | |
41 | ||
037e20a3 | 42 | CFL := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64 |
2aae950b | 43 | |
a0f97e06 SR |
44 | $(obj)/vclock_gettime.o: KBUILD_CFLAGS = $(CFL) |
45 | $(obj)/vgetcpu.o: KBUILD_CFLAGS = $(CFL) | |
2aae950b AK |
46 | |
47 | # We also create a special relocatable object that should mirror the symbol | |
48 | # table and layout of the linked DSO. With ld -R we can then refer to | |
49 | # these symbols in the kernel code rather than hand-coded addresses. | |
50 | extra-y += vdso-syms.o | |
51 | $(obj)/built-in.o: $(obj)/vdso-syms.o | |
52 | $(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o | |
53 | ||
54 | SYSCFLAGS_vdso-syms.o = -r -d | |
55 | $(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE | |
56 | $(call if_changed,syscall) | |
f79eb83b RM |
57 | |
58 | quiet_cmd_vdso_install = INSTALL $@ | |
59 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
60 | vdso.so: | |
61 | @mkdir -p $(MODLIB)/vdso | |
62 | $(call cmd,vdso_install) | |
63 | ||
64 | vdso_install: vdso.so |