Commit | Line | Data |
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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 | ||
16 | targets += vdso.so vdso.lds $(vobjs-y) vdso-syms.o | |
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 $@ | |
22 | ||
23 | export CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
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) | |
29 | ||
30 | $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so | |
31 | ||
32 | $(obj)/vdso.so: $(src)/vdso.lds $(vobjs) FORCE | |
33 | $(call if_changed,syscall) | |
34 | ||
037e20a3 | 35 | CFL := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64 |
2aae950b | 36 | |
037e20a3 AK |
37 | $(obj)/vclock_gettime.o: CFLAGS = $(CFL) |
38 | $(obj)/vgetcpu.o: CFLAGS = $(CFL) | |
2aae950b AK |
39 | |
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 | |
46 | ||
47 | SYSCFLAGS_vdso-syms.o = -r -d | |
48 | $(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE | |
49 | $(call if_changed,syscall) |