xref: /openbmc/linux/arch/mips/vdso/Makefile (revision a8fe58ce) 
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	$(filter -march=%,$(KBUILD_CFLAGS))
9cflags-vdso := $(ccflags-vdso) \
10	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
11	-O2 -g -fPIC -fno-common -fno-builtin -G 0 -DDISABLE_BRANCH_PROFILING \
12	$(call cc-option, -fno-stack-protector)
13aflags-vdso := $(ccflags-vdso) \
14	$(filter -I%,$(KBUILD_CFLAGS)) \
15	$(filter -E%,$(KBUILD_CFLAGS)) \
16	-D__ASSEMBLY__ -Wa,-gdwarf-2
17
18#
19# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
20# the base address of VDSO, the linker will emit a R_MIPS_PC32
21# relocation in binutils > 2.25 but it will fail with older versions
22# because that relocation is not supported for that symbol. As a result
23# of which we are forced to disable the VDSO symbols when building
24# with < 2.25 binutils on pre-R6 kernels. For more references on why we
25# can't use other methods to get the base address of VDSO please refer to
26# the comments on that file.
27#
28ifndef CONFIG_CPU_MIPSR6
29  ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
30    $(warning MIPS VDSO requires binutils >= 2.25)
31    obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
32    ccflags-vdso += -DDISABLE_MIPS_VDSO
33  endif
34endif
35
36# VDSO linker flags.
37VDSO_LDFLAGS := \
38	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
39	-nostdlib -shared \
40	$(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
41	$(call cc-ldoption, -Wl$(comma)--build-id)
42
43GCOV_PROFILE := n
44
45#
46# Shared build commands.
47#
48
49quiet_cmd_vdsold = VDSO    $@
50      cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
51                   -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
52
53hostprogs-y := genvdso
54
55quiet_cmd_genvdso = GENVDSO $@
56define cmd_genvdso
57	cp $< $(<:%.dbg=%) && \
58	$(OBJCOPY) -S $< $(<:%.dbg=%) && \
59	$(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
60endef
61
62#
63# Build native VDSO.
64#
65
66native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
67
68targets += $(obj-vdso-y)
69targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
70
71obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
72
73$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
74$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
75
76$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
77
78$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
79	$(call if_changed,vdsold)
80
81$(obj)/vdso-image.c: $(obj)/vdso.so.dbg $(obj)/genvdso FORCE
82	$(call if_changed,genvdso)
83
84obj-y += vdso-image.o
85
86#
87# Build O32 VDSO.
88#
89
90# Define these outside the ifdef to ensure they are picked up by clean.
91targets += $(obj-vdso-y:%.o=%-o32.o)
92targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
93
94ifdef CONFIG_MIPS32_O32
95
96obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
97
98$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
99$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
100
101$(obj)/%-o32.o: $(src)/%.S FORCE
102	$(call if_changed_dep,as_o_S)
103
104$(obj)/%-o32.o: $(src)/%.c FORCE
105	$(call cmd,force_checksrc)
106	$(call if_changed_rule,cc_o_c)
107
108$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
109$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
110	$(call if_changed_dep,cpp_lds_S)
111
112$(obj)/vdso-o32.so.dbg: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
113	$(call if_changed,vdsold)
114
115$(obj)/vdso-o32-image.c: VDSO_NAME := o32
116$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg $(obj)/genvdso FORCE
117	$(call if_changed,genvdso)
118
119obj-y += vdso-o32-image.o
120
121endif
122
123#
124# Build N32 VDSO.
125#
126
127targets += $(obj-vdso-y:%.o=%-n32.o)
128targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
129
130ifdef CONFIG_MIPS32_N32
131
132obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
133
134$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
135$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
136
137$(obj)/%-n32.o: $(src)/%.S FORCE
138	$(call if_changed_dep,as_o_S)
139
140$(obj)/%-n32.o: $(src)/%.c FORCE
141	$(call cmd,force_checksrc)
142	$(call if_changed_rule,cc_o_c)
143
144$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
145$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
146	$(call if_changed_dep,cpp_lds_S)
147
148$(obj)/vdso-n32.so.dbg: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
149	$(call if_changed,vdsold)
150
151$(obj)/vdso-n32-image.c: VDSO_NAME := n32
152$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg $(obj)/genvdso FORCE
153	$(call if_changed,genvdso)
154
155obj-y += vdso-n32-image.o
156
157endif
158
159# FIXME: Need install rule for debug.
160# Needs to deal with dependency for generation of dbg by cmd_genvdso...
161