1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO. 2 # Objects to go into the VDSO.
3 !! 3 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
4 # Include the generic Makefile to check the bu <<
5 include $(srctree)/lib/vdso/Makefile <<
6 <<
7 obj-vdso-y := elf.o vgettimeofday.o sigreturn. <<
8 4
9 # Common compiler flags between ABIs. 5 # Common compiler flags between ABIs.
10 ccflags-vdso := \ 6 ccflags-vdso := \
11 $(filter -I%,$(KBUILD_CFLAGS)) \ 7 $(filter -I%,$(KBUILD_CFLAGS)) \
12 $(filter -E%,$(KBUILD_CFLAGS)) \ 8 $(filter -E%,$(KBUILD_CFLAGS)) \
13 $(filter -mmicromips,$(KBUILD_CFLAGS)) 9 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ !! 10 $(filter -march=%,$(KBUILD_CFLAGS))
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ <<
16 $(filter -mno-loongson-%,$(KBUILD_CFLA <<
17 $(CLANG_FLAGS) \ <<
18 -D__VDSO__ <<
19 <<
20 ifndef CONFIG_64BIT <<
21 ccflags-vdso += -DBUILD_VDSO32 <<
22 endif <<
23 <<
24 # <<
25 # The -fno-jump-tables flag only prevents the <<
26 # jump tables but does not prevent the compile <<
27 # offsets. <<
28 cflags-vdso := $(ccflags-vdso) \ 11 cflags-vdso := $(ccflags-vdso) \
29 $(filter -W%,$(filter-out -Wa$(comma)% 12 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
30 -O3 -g -fPIC -fno-strict-aliasing -fno !! 13 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
31 -mrelax-pic-calls $(call cc-option, -m !! 14 -DDISABLE_BRANCH_PROFILING \
32 -fno-stack-protector -fno-jump-tables !! 15 $(call cc-option, -fno-asynchronous-unwind-tables) \
33 $(call cc-option, -fno-asynchronous-un !! 16 $(call cc-option, -fno-stack-protector)
34 aflags-vdso := $(ccflags-vdso) \ 17 aflags-vdso := $(ccflags-vdso) \
35 -D__ASSEMBLY__ -Wa,-gdwarf-2 18 -D__ASSEMBLY__ -Wa,-gdwarf-2
36 19
37 ifneq ($(c-gettimeofday-y),) !! 20 #
38 CFLAGS_vgettimeofday.o = -include $(c-gettimeo !! 21 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
39 !! 22 # the base address of VDSO, the linker will emit a R_MIPS_PC32
40 # config-n32-o32-env.c prepares the environmen !! 23 # relocation in binutils > 2.25 but it will fail with older versions
41 # library on a 64bit kernel. !! 24 # because that relocation is not supported for that symbol. As a result
42 # Note: Needs to be included before than the g !! 25 # of which we are forced to disable the VDSO symbols when building
43 CFLAGS_vgettimeofday-o32.o = -include $(src)/c !! 26 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
44 CFLAGS_vgettimeofday-n32.o = -include $(src)/c !! 27 # can't use other methods to get the base address of VDSO please refer to
45 endif !! 28 # the comments on that file.
46 !! 29 #
47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTR !! 30 ifndef CONFIG_CPU_MIPSR6
48 !! 31 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
49 ifdef CONFIG_MIPS_DISABLE_VDSO !! 32 $(warning MIPS VDSO requires binutils >= 2.25)
50 obj-vdso-y := $(filter-out vgettimeofday.o, !! 33 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
>> 34 ccflags-vdso += -DDISABLE_MIPS_VDSO
>> 35 endif
51 endif 36 endif
52 37
53 # VDSO linker flags. 38 # VDSO linker flags.
54 ldflags-y := -Bsymbolic --no-undefined -soname !! 39 VDSO_LDFLAGS := \
55 $(filter -E%,$(KBUILD_CFLAGS)) -shared !! 40 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
56 -G 0 --eh-frame-hdr --hash-style=sysv !! 41 -nostdlib -shared \
57 !! 42 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
58 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) !! 43 $(call cc-ldoption, -Wl$(comma)--build-id)
59 !! 44
60 # Check that we don't have PIC 'jalr t9' calls !! 45 GCOV_PROFILE := n
61 quiet_cmd_vdso_mips_check = VDSOCHK $@ <<
62 cmd_vdso_mips_check = if $(OBJDUMP) --di <<
63 then (echo >&2 "$@: PIC <<
64 rm -f $@; /bin/fa <<
65 46
66 # 47 #
67 # Shared build commands. 48 # Shared build commands.
68 # 49 #
69 50
70 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 51 quiet_cmd_vdsold = VDSO $@
71 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 52 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 53 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
72 54
73 quiet_cmd_vdsoas_o_S = AS $@ !! 55 quiet_cmd_vdsoas_o_S = AS $@
74 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 56 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
75 57
76 # Strip rule for the raw .so files 58 # Strip rule for the raw .so files
77 $(obj)/%.so.raw: OBJCOPYFLAGS := -S 59 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
78 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 60 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
79 $(call if_changed,objcopy) 61 $(call if_changed,objcopy)
80 62
81 hostprogs := genvdso !! 63 hostprogs-y := genvdso
82 64
83 quiet_cmd_genvdso = GENVDSO $@ 65 quiet_cmd_genvdso = GENVDSO $@
84 define cmd_genvdso 66 define cmd_genvdso
85 $(foreach file,$(filter %.raw,$^),cp $ 67 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
86 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg. 68 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
87 endef 69 endef
88 70
89 # 71 #
90 # Build native VDSO. 72 # Build native VDSO.
91 # 73 #
92 74
93 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 75 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
94 76
95 targets += $(obj-vdso-y) 77 targets += $(obj-vdso-y)
96 targets += vdso.lds 78 targets += vdso.lds
97 targets += vdso.so.dbg.raw vdso.so.raw 79 targets += vdso.so.dbg.raw vdso.so.raw
98 targets += vdso.so.dbg vdso.so 80 targets += vdso.so.dbg vdso.so
99 targets += vdso-image.c 81 targets += vdso-image.c
100 82
101 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 83 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
102 84
103 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 85 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
104 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 86 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
105 87
106 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 88 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
107 89
108 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj- 90 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
109 $(call if_changed,vdsold_and_vdso_chec !! 91 $(call if_changed,vdsold)
110 92
111 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $( 93 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
112 $(obj)/genvdso FORCE 94 $(obj)/genvdso FORCE
113 $(call if_changed,genvdso) 95 $(call if_changed,genvdso)
114 96
115 obj-y += vdso-image.o 97 obj-y += vdso-image.o
116 98
117 # 99 #
118 # Build O32 VDSO. 100 # Build O32 VDSO.
119 # 101 #
120 102
121 # Define these outside the ifdef to ensure the 103 # Define these outside the ifdef to ensure they are picked up by clean.
122 targets += $(obj-vdso-y:%.o=%-o32.o) 104 targets += $(obj-vdso-y:%.o=%-o32.o)
123 targets += vdso-o32.lds 105 targets += vdso-o32.lds
124 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 106 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
125 targets += vdso-o32.so.dbg vdso-o32.so 107 targets += vdso-o32.so.dbg vdso-o32.so
126 targets += vdso-o32-image.c 108 targets += vdso-o32-image.c
127 109
128 ifdef CONFIG_MIPS32_O32 110 ifdef CONFIG_MIPS32_O32
129 111
130 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32. 112 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
131 113
132 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vds 114 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
133 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vds 115 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
134 116
135 $(obj)/%-o32.o: $(src)/%.S FORCE 117 $(obj)/%-o32.o: $(src)/%.S FORCE
136 $(call if_changed_dep,vdsoas_o_S) 118 $(call if_changed_dep,vdsoas_o_S)
137 119
138 $(obj)/%-o32.o: $(src)/%.c FORCE 120 $(obj)/%-o32.o: $(src)/%.c FORCE
139 $(call cmd,force_checksrc) 121 $(call cmd,force_checksrc)
140 $(call if_changed_rule,cc_o_c) 122 $(call if_changed_rule,cc_o_c)
141 123
142 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccfl !! 124 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
143 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 125 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
144 $(call if_changed_dep,cpp_lds_S) 126 $(call if_changed_dep,cpp_lds_S)
145 127
146 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.ld 128 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
147 $(call if_changed,vdsold_and_vdso_chec !! 129 $(call if_changed,vdsold)
148 130
149 $(obj)/vdso-o32-image.c: VDSO_NAME := o32 131 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
150 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.db 132 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
151 $(obj)/genvdso FORCE 133 $(obj)/genvdso FORCE
152 $(call if_changed,genvdso) 134 $(call if_changed,genvdso)
153 135
154 obj-y += vdso-o32-image.o 136 obj-y += vdso-o32-image.o
155 137
156 endif 138 endif
157 139
158 # 140 #
159 # Build N32 VDSO. 141 # Build N32 VDSO.
160 # 142 #
161 143
162 targets += $(obj-vdso-y:%.o=%-n32.o) 144 targets += $(obj-vdso-y:%.o=%-n32.o)
163 targets += vdso-n32.lds 145 targets += vdso-n32.lds
164 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 146 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
165 targets += vdso-n32.so.dbg vdso-n32.so 147 targets += vdso-n32.so.dbg vdso-n32.so
166 targets += vdso-n32-image.c 148 targets += vdso-n32-image.c
167 149
168 ifdef CONFIG_MIPS32_N32 150 ifdef CONFIG_MIPS32_N32
169 151
170 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32. 152 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
171 153
172 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vds 154 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
173 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vds 155 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
174 156
175 $(obj)/%-n32.o: $(src)/%.S FORCE 157 $(obj)/%-n32.o: $(src)/%.S FORCE
176 $(call if_changed_dep,vdsoas_o_S) 158 $(call if_changed_dep,vdsoas_o_S)
177 159
178 $(obj)/%-n32.o: $(src)/%.c FORCE 160 $(obj)/%-n32.o: $(src)/%.c FORCE
179 $(call cmd,force_checksrc) 161 $(call cmd,force_checksrc)
180 $(call if_changed_rule,cc_o_c) 162 $(call if_changed_rule,cc_o_c)
181 163
182 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccfl !! 164 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
183 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 165 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
184 $(call if_changed_dep,cpp_lds_S) 166 $(call if_changed_dep,cpp_lds_S)
185 167
186 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.ld 168 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
187 $(call if_changed,vdsold_and_vdso_chec !! 169 $(call if_changed,vdsold)
188 170
189 $(obj)/vdso-n32-image.c: VDSO_NAME := n32 171 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
190 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.db 172 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
191 $(obj)/genvdso FORCE 173 $(obj)/genvdso FORCE
192 $(call if_changed,genvdso) 174 $(call if_changed,genvdso)
193 175
194 obj-y += vdso-n32-image.o 176 obj-y += vdso-n32-image.o
195 177
196 endif 178 endif
197 179
198 # FIXME: Need install rule for debug. 180 # FIXME: Need install rule for debug.
199 # Needs to deal with dependency for generation 181 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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