1# Objects to go into the VDSO.
2obj-vdso-y := elf.o gettimeofday.o sigreturn.o
3
4# Common compiler flags between ABIs.
5ccflags-vdso := \
6	$(filter -I%,$(KBUILD_CFLAGS)) \
7	$(filter -E%,$(KBUILD_CFLAGS)) \
8	$(filter -mmicromips,$(KBUILD_CFLAGS)) \
9	$(filter -march=%,$(KBUILD_CFLAGS))
10cflags-vdso := $(ccflags-vdso) \
11	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
12	-O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
13	-DDISABLE_BRANCH_PROFILING \
14	$(call cc-option, -fno-stack-protector)
15aflags-vdso := $(ccflags-vdso) \
16	$(filter -I%,$(KBUILD_CFLAGS)) \
17	$(filter -E%,$(KBUILD_CFLAGS)) \
18	-D__ASSEMBLY__ -Wa,-gdwarf-2
19
20#
21# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
22# the base address of VDSO, the linker will emit a R_MIPS_PC32
23# relocation in binutils > 2.25 but it will fail with older versions
24# because that relocation is not supported for that symbol. As a result
25# of which we are forced to disable the VDSO symbols when building
26# with < 2.25 binutils on pre-R6 kernels. For more references on why we
27# can't use other methods to get the base address of VDSO please refer to
28# the comments on that file.
29#
30ifndef CONFIG_CPU_MIPSR6
31  ifeq ($(call ld-ifversion, -lt, 22500000, y),y)
32    $(warning MIPS VDSO requires binutils >= 2.25)
33    obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
34    ccflags-vdso += -DDISABLE_MIPS_VDSO
35  endif
36endif
37
38# VDSO linker flags.
39VDSO_LDFLAGS := \
40	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
41	-nostdlib -shared \
42	$(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
43	$(call cc-ldoption, -Wl$(comma)--build-id)
44
45GCOV_PROFILE := n
46
47#
48# Shared build commands.
49#
50
51quiet_cmd_vdsold = VDSO    $@
52      cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
53                   -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
54
55hostprogs-y := genvdso
56
57quiet_cmd_genvdso = GENVDSO $@
58define cmd_genvdso
59	cp $< $(<:%.dbg=%) && \
60	$(OBJCOPY) -S $< $(<:%.dbg=%) && \
61	$(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
62endef
63
64#
65# Build native VDSO.
66#
67
68native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
69
70targets += $(obj-vdso-y)
71targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
72
73obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
74
75$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
76$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
77
78$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
79
80$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
81	$(call if_changed,vdsold)
82
83$(obj)/vdso-image.c: $(obj)/vdso.so.dbg $(obj)/genvdso FORCE
84	$(call if_changed,genvdso)
85
86obj-y += vdso-image.o
87
88#
89# Build O32 VDSO.
90#
91
92# Define these outside the ifdef to ensure they are picked up by clean.
93targets += $(obj-vdso-y:%.o=%-o32.o)
94targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
95
96ifdef CONFIG_MIPS32_O32
97
98obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
99
100$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
101$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
102
103$(obj)/%-o32.o: $(src)/%.S FORCE
104	$(call if_changed_dep,as_o_S)
105
106$(obj)/%-o32.o: $(src)/%.c FORCE
107	$(call cmd,force_checksrc)
108	$(call if_changed_rule,cc_o_c)
109
110$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
111$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
112	$(call if_changed_dep,cpp_lds_S)
113
114$(obj)/vdso-o32.so.dbg: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
115	$(call if_changed,vdsold)
116
117$(obj)/vdso-o32-image.c: VDSO_NAME := o32
118$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg $(obj)/genvdso FORCE
119	$(call if_changed,genvdso)
120
121obj-y += vdso-o32-image.o
122
123endif
124
125#
126# Build N32 VDSO.
127#
128
129targets += $(obj-vdso-y:%.o=%-n32.o)
130targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
131
132ifdef CONFIG_MIPS32_N32
133
134obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
135
136$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
137$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
138
139$(obj)/%-n32.o: $(src)/%.S FORCE
140	$(call if_changed_dep,as_o_S)
141
142$(obj)/%-n32.o: $(src)/%.c FORCE
143	$(call cmd,force_checksrc)
144	$(call if_changed_rule,cc_o_c)
145
146$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
147$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
148	$(call if_changed_dep,cpp_lds_S)
149
150$(obj)/vdso-n32.so.dbg: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
151	$(call if_changed,vdsold)
152
153$(obj)/vdso-n32-image.c: VDSO_NAME := n32
154$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg $(obj)/genvdso FORCE
155	$(call if_changed,genvdso)
156
157obj-y += vdso-n32-image.o
158
159endif
160
161# FIXME: Need install rule for debug.
162# Needs to deal with dependency for generation of dbg by cmd_genvdso...
163