blob: 3b4538ec0102d5d28b15bc6421db11663fb377ff [file] [log] [blame]
Alex Smithebb5e782015-10-21 09:54:38 +01001# 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)) \
James Hoganbb930782016-05-24 09:35:11 +01008 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
Alex Smithebb5e782015-10-21 09:54:38 +01009 $(filter -march=%,$(KBUILD_CFLAGS))
10cflags-vdso := $(ccflags-vdso) \
11 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
Maciej W. Rozycki94cc36b2016-05-26 12:55:45 +010012 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
13 -DDISABLE_BRANCH_PROFILING \
Alex Smithebb5e782015-10-21 09:54:38 +010014 $(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
James Hogand5ece1c2015-12-26 22:47:52 +000031 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
Qais Yousef2a037f32015-12-08 10:11:43 +000032 $(warning MIPS VDSO requires binutils >= 2.25)
Alex Smithebb5e782015-10-21 09:54:38 +010033 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 $@
54
James Hogan2afb9742016-05-13 19:41:06 +010055# Strip rule for the raw .so files
56$(obj)/%.so.raw: OBJCOPYFLAGS := -S
57$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
58 $(call if_changed,objcopy)
59
Alex Smithebb5e782015-10-21 09:54:38 +010060hostprogs-y := genvdso
61
62quiet_cmd_genvdso = GENVDSO $@
63define cmd_genvdso
James Hogan2afb9742016-05-13 19:41:06 +010064 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
65 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
Alex Smithebb5e782015-10-21 09:54:38 +010066endef
67
68#
69# Build native VDSO.
70#
71
72native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
73
74targets += $(obj-vdso-y)
James Hogan2afb9742016-05-13 19:41:06 +010075targets += vdso.lds
76targets += vdso.so.dbg.raw vdso.so.raw
77targets += vdso.so.dbg vdso.so
78targets += vdso-image.c
Alex Smithebb5e782015-10-21 09:54:38 +010079
80obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
81
82$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
83$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
84
85$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
86
James Hogan2afb9742016-05-13 19:41:06 +010087$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
Alex Smithebb5e782015-10-21 09:54:38 +010088 $(call if_changed,vdsold)
89
James Hogan2afb9742016-05-13 19:41:06 +010090$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
91 $(obj)/genvdso FORCE
Alex Smithebb5e782015-10-21 09:54:38 +010092 $(call if_changed,genvdso)
93
94obj-y += vdso-image.o
95
96#
97# Build O32 VDSO.
98#
99
100# Define these outside the ifdef to ensure they are picked up by clean.
101targets += $(obj-vdso-y:%.o=%-o32.o)
James Hogan2afb9742016-05-13 19:41:06 +0100102targets += vdso-o32.lds
103targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
104targets += vdso-o32.so.dbg vdso-o32.so
105targets += vdso-o32-image.c
Alex Smithebb5e782015-10-21 09:54:38 +0100106
107ifdef CONFIG_MIPS32_O32
108
109obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
110
111$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
112$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
113
114$(obj)/%-o32.o: $(src)/%.S FORCE
115 $(call if_changed_dep,as_o_S)
116
117$(obj)/%-o32.o: $(src)/%.c FORCE
118 $(call cmd,force_checksrc)
119 $(call if_changed_rule,cc_o_c)
120
121$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
122$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
123 $(call if_changed_dep,cpp_lds_S)
124
James Hogan2afb9742016-05-13 19:41:06 +0100125$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
Alex Smithebb5e782015-10-21 09:54:38 +0100126 $(call if_changed,vdsold)
127
128$(obj)/vdso-o32-image.c: VDSO_NAME := o32
James Hogan2afb9742016-05-13 19:41:06 +0100129$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
130 $(obj)/genvdso FORCE
Alex Smithebb5e782015-10-21 09:54:38 +0100131 $(call if_changed,genvdso)
132
133obj-y += vdso-o32-image.o
134
135endif
136
137#
138# Build N32 VDSO.
139#
140
141targets += $(obj-vdso-y:%.o=%-n32.o)
James Hogan2afb9742016-05-13 19:41:06 +0100142targets += vdso-n32.lds
143targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
144targets += vdso-n32.so.dbg vdso-n32.so
145targets += vdso-n32-image.c
Alex Smithebb5e782015-10-21 09:54:38 +0100146
147ifdef CONFIG_MIPS32_N32
148
149obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
150
151$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
152$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
153
154$(obj)/%-n32.o: $(src)/%.S FORCE
155 $(call if_changed_dep,as_o_S)
156
157$(obj)/%-n32.o: $(src)/%.c FORCE
158 $(call cmd,force_checksrc)
159 $(call if_changed_rule,cc_o_c)
160
161$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
162$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
163 $(call if_changed_dep,cpp_lds_S)
164
James Hogan2afb9742016-05-13 19:41:06 +0100165$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
Alex Smithebb5e782015-10-21 09:54:38 +0100166 $(call if_changed,vdsold)
167
168$(obj)/vdso-n32-image.c: VDSO_NAME := n32
James Hogan2afb9742016-05-13 19:41:06 +0100169$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
170 $(obj)/genvdso FORCE
Alex Smithebb5e782015-10-21 09:54:38 +0100171 $(call if_changed,genvdso)
172
173obj-y += vdso-n32-image.o
174
175endif
176
177# FIXME: Need install rule for debug.
178# Needs to deal with dependency for generation of dbg by cmd_genvdso...