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Commit | Line | Data |
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4a556f4f CM |
1 | # Symbols present in the vdso |
2 | vdso-syms = rt_sigreturn gettimeofday | |
3 | ||
4 | # Files to link into the vdso | |
5 | obj-vdso = $(patsubst %, v%.o, $(vdso-syms)) | |
6 | ||
7 | # Build rules | |
8 | targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds | |
9 | obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
10 | ||
11 | # vdso32 is only for tilegx -m32 compat task. | |
12 | VDSO32-$(CONFIG_COMPAT) := y | |
13 | ||
14 | obj-y += vdso.o | |
15 | obj-$(VDSO32-y) += vdso32.o | |
16 | extra-y += vdso.lds | |
17 | CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
18 | ||
19 | # vDSO code runs in userspace and -pg doesn't help with profiling anyway. | |
20 | CFLAGS_REMOVE_vdso.o = -pg | |
21 | CFLAGS_REMOVE_vdso32.o = -pg | |
22 | CFLAGS_REMOVE_vrt_sigreturn.o = -pg | |
23 | CFLAGS_REMOVE_vrt_sigreturn32.o = -pg | |
24 | CFLAGS_REMOVE_vgettimeofday.o = -pg | |
25 | CFLAGS_REMOVE_vgettimeofday32.o = -pg | |
26 | ||
27 | ifdef CONFIG_FEEDBACK_COLLECT | |
28 | # vDSO code runs in userspace, not collecting feedback data. | |
29 | CFLAGS_REMOVE_vdso.o = -ffeedback-generate | |
30 | CFLAGS_REMOVE_vdso32.o = -ffeedback-generate | |
31 | CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate | |
32 | CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate | |
33 | CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate | |
34 | CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate | |
35 | endif | |
36 | ||
37 | # Disable gcov profiling for VDSO code | |
38 | GCOV_PROFILE := n | |
39 | ||
40 | # Force dependency | |
41 | $(obj)/vdso.o: $(obj)/vdso.so | |
42 | ||
43 | # link rule for the .so file, .lds has to be first | |
44 | SYSCFLAGS_vdso.so.dbg = $(c_flags) | |
45 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) | |
46 | $(call if_changed,vdsold) | |
47 | ||
48 | ||
49 | # We also create a special relocatable object that should mirror the symbol | |
50 | # table and layout of the linked DSO. With ld -R we can then refer to | |
51 | # these symbols in the kernel code rather than hand-coded addresses. | |
52 | extra-y += vdso-syms.o | |
53 | $(obj)/built-in.o: $(obj)/vdso-syms.o | |
54 | $(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o | |
55 | ||
56 | SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ | |
57 | $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) | |
58 | SYSCFLAGS_vdso_syms.o = -r | |
59 | $(obj)/vdso-syms.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE | |
60 | $(call if_changed,vdsold) | |
61 | ||
62 | ||
63 | # strip rule for the .so file | |
64 | $(obj)/%.so: OBJCOPYFLAGS := -S | |
65 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
66 | $(call if_changed,objcopy) | |
67 | ||
68 | # actual build commands | |
69 | # The DSO images are built using a special linker script | |
70 | # Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions. | |
71 | # Make sure only to export the intended __vdso_xxx symbol offsets. | |
72 | quiet_cmd_vdsold = VDSOLD $@ | |
73 | cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \ | |
74 | -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \ | |
75 | $(CROSS_COMPILE)objcopy \ | |
76 | $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ | |
77 | ||
78 | # install commands for the unstripped file | |
79 | quiet_cmd_vdso_install = INSTALL $@ | |
80 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
81 | ||
82 | vdso.so: $(obj)/vdso.so.dbg | |
83 | @mkdir -p $(MODLIB)/vdso | |
84 | $(call cmd,vdso_install) | |
85 | ||
86 | vdso32.so: $(obj)/vdso32.so.dbg | |
87 | $(call cmd,vdso_install) | |
88 | ||
89 | vdso_install: vdso.so | |
90 | vdso32_install: vdso32.so | |
91 | ||
92 | ||
93 | KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) | |
94 | KBUILD_AFLAGS_32 += -m32 -s | |
95 | KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) | |
96 | KBUILD_CFLAGS_32 += -m32 -fPIC -shared | |
97 | ||
98 | obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms)) | |
99 | obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) | |
100 | ||
101 | targets += $(obj-vdso32) vdso32.so vdso32.so.dbg | |
102 | ||
103 | $(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) | |
104 | $(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) | |
105 | ||
106 | $(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c | |
603eb2cd | 107 | $(call if_changed_rule,cc_o_c) |
4a556f4f CM |
108 | |
109 | $(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S | |
110 | $(call if_changed,as_o_S) | |
111 | ||
112 | # Force dependency | |
113 | $(obj)/vdso32.o: $(obj)/vdso32.so | |
114 | ||
115 | SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \ | |
116 | $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) | |
117 | $(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32) | |
118 | $(call if_changed,vdsold) |