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Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
ebb5e78c | 2 | # Objects to go into the VDSO. |
24640f23 VF |
3 | |
4 | # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before | |
5 | # the inclusion of generic Makefile. | |
6 | ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT | |
7 | include $(srctree)/lib/vdso/Makefile | |
8 | ||
9 | obj-vdso-y := elf.o vgettimeofday.o sigreturn.o | |
ebb5e78c AS |
10 | |
11 | # Common compiler flags between ABIs. | |
12 | ccflags-vdso := \ | |
13 | $(filter -I%,$(KBUILD_CFLAGS)) \ | |
14 | $(filter -E%,$(KBUILD_CFLAGS)) \ | |
bb93078e | 15 | $(filter -mmicromips,$(KBUILD_CFLAGS)) \ |
351fdddd | 16 | $(filter -march=%,$(KBUILD_CFLAGS)) \ |
0648e50e | 17 | $(filter -m%-float,$(KBUILD_CFLAGS)) \ |
2f2b4fd6 | 18 | $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \ |
351fdddd | 19 | -D__VDSO__ |
ee67855e | 20 | |
076f421d | 21 | ifdef CONFIG_CC_IS_CLANG |
ee67855e PB |
22 | ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) |
23 | endif | |
24 | ||
24640f23 VF |
25 | # |
26 | # The -fno-jump-tables flag only prevents the compiler from generating | |
27 | # jump tables but does not prevent the compiler from emitting absolute | |
28 | # offsets. | |
ebb5e78c AS |
29 | cflags-vdso := $(ccflags-vdso) \ |
30 | $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ | |
24640f23 VF |
31 | -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ |
32 | -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ | |
cfd75c2d | 33 | $(call cc-option, -fno-asynchronous-unwind-tables) \ |
ebb5e78c AS |
34 | $(call cc-option, -fno-stack-protector) |
35 | aflags-vdso := $(ccflags-vdso) \ | |
ebb5e78c AS |
36 | -D__ASSEMBLY__ -Wa,-gdwarf-2 |
37 | ||
24640f23 VF |
38 | ifneq ($(c-gettimeofday-y),) |
39 | CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y) | |
40 | ||
41 | # config-n32-o32-env.c prepares the environment to build a 32bit vDSO | |
42 | # library on a 64bit kernel. | |
43 | # Note: Needs to be included before than the generic library. | |
b4c0f7fa VF |
44 | CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) |
45 | CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y) | |
24640f23 VF |
46 | endif |
47 | ||
48 | CFLAGS_REMOVE_vgettimeofday.o = -pg | |
49 | ||
ebb5e78c AS |
50 | # |
51 | # For the pre-R6 code in arch/mips/vdso/vdso.h for locating | |
52 | # the base address of VDSO, the linker will emit a R_MIPS_PC32 | |
53 | # relocation in binutils > 2.25 but it will fail with older versions | |
54 | # because that relocation is not supported for that symbol. As a result | |
55 | # of which we are forced to disable the VDSO symbols when building | |
56 | # with < 2.25 binutils on pre-R6 kernels. For more references on why we | |
57 | # can't use other methods to get the base address of VDSO please refer to | |
58 | # the comments on that file. | |
59 | # | |
60 | ifndef CONFIG_CPU_MIPSR6 | |
d5ece1cb | 61 | ifeq ($(call ld-ifversion, -lt, 225000000, y),y) |
2a037f31 | 62 | $(warning MIPS VDSO requires binutils >= 2.25) |
8919975b | 63 | obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y)) |
ebb5e78c AS |
64 | ccflags-vdso += -DDISABLE_MIPS_VDSO |
65 | endif | |
66 | endif | |
67 | ||
68 | # VDSO linker flags. | |
69 | VDSO_LDFLAGS := \ | |
70 | -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \ | |
2f002567 | 71 | $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \ |
1e022137 | 72 | -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id |
ebb5e78c | 73 | |
24640f23 VF |
74 | CFLAGS_REMOVE_vdso.o = -pg |
75 | ||
ebb5e78c | 76 | GCOV_PROFILE := n |
1e35918a | 77 | UBSAN_SANITIZE := n |
ebb5e78c AS |
78 | |
79 | # | |
80 | # Shared build commands. | |
81 | # | |
82 | ||
cdab7e2c VF |
83 | quiet_cmd_vdsold_and_vdso_check = LD $@ |
84 | cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check) | |
85 | ||
ebb5e78c AS |
86 | quiet_cmd_vdsold = VDSO $@ |
87 | cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ | |
88 | -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ | |
89 | ||
cdab7e2c | 90 | quiet_cmd_vdsoas_o_S = AS $@ |
b668970e AB |
91 | cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< |
92 | ||
2afb9745 JH |
93 | # Strip rule for the raw .so files |
94 | $(obj)/%.so.raw: OBJCOPYFLAGS := -S | |
95 | $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE | |
96 | $(call if_changed,objcopy) | |
97 | ||
ebb5e78c AS |
98 | hostprogs-y := genvdso |
99 | ||
100 | quiet_cmd_genvdso = GENVDSO $@ | |
101 | define cmd_genvdso | |
2afb9745 JH |
102 | $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \ |
103 | $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME) | |
ebb5e78c AS |
104 | endef |
105 | ||
106 | # | |
107 | # Build native VDSO. | |
108 | # | |
109 | ||
110 | native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) | |
111 | ||
112 | targets += $(obj-vdso-y) | |
2afb9745 JH |
113 | targets += vdso.lds |
114 | targets += vdso.so.dbg.raw vdso.so.raw | |
115 | targets += vdso.so.dbg vdso.so | |
116 | targets += vdso-image.c | |
ebb5e78c AS |
117 | |
118 | obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) | |
119 | ||
120 | $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) | |
121 | $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) | |
122 | ||
034827c7 | 123 | $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) |
ebb5e78c | 124 | |
2afb9745 | 125 | $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE |
cdab7e2c | 126 | $(call if_changed,vdsold_and_vdso_check) |
ebb5e78c | 127 | |
2afb9745 JH |
128 | $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \ |
129 | $(obj)/genvdso FORCE | |
ebb5e78c AS |
130 | $(call if_changed,genvdso) |
131 | ||
132 | obj-y += vdso-image.o | |
133 | ||
134 | # | |
135 | # Build O32 VDSO. | |
136 | # | |
137 | ||
138 | # Define these outside the ifdef to ensure they are picked up by clean. | |
139 | targets += $(obj-vdso-y:%.o=%-o32.o) | |
2afb9745 JH |
140 | targets += vdso-o32.lds |
141 | targets += vdso-o32.so.dbg.raw vdso-o32.so.raw | |
142 | targets += vdso-o32.so.dbg vdso-o32.so | |
143 | targets += vdso-o32-image.c | |
ebb5e78c AS |
144 | |
145 | ifdef CONFIG_MIPS32_O32 | |
146 | ||
147 | obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o) | |
148 | ||
149 | $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32 | |
150 | $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32 | |
151 | ||
152 | $(obj)/%-o32.o: $(src)/%.S FORCE | |
b668970e | 153 | $(call if_changed_dep,vdsoas_o_S) |
ebb5e78c AS |
154 | |
155 | $(obj)/%-o32.o: $(src)/%.c FORCE | |
156 | $(call cmd,force_checksrc) | |
157 | $(call if_changed_rule,cc_o_c) | |
158 | ||
67fc5dc8 | 159 | $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32 |
ebb5e78c AS |
160 | $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE |
161 | $(call if_changed_dep,cpp_lds_S) | |
162 | ||
2afb9745 | 163 | $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE |
cdab7e2c | 164 | $(call if_changed,vdsold_and_vdso_check) |
ebb5e78c AS |
165 | |
166 | $(obj)/vdso-o32-image.c: VDSO_NAME := o32 | |
2afb9745 JH |
167 | $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \ |
168 | $(obj)/genvdso FORCE | |
ebb5e78c AS |
169 | $(call if_changed,genvdso) |
170 | ||
171 | obj-y += vdso-o32-image.o | |
172 | ||
173 | endif | |
174 | ||
175 | # | |
176 | # Build N32 VDSO. | |
177 | # | |
178 | ||
179 | targets += $(obj-vdso-y:%.o=%-n32.o) | |
2afb9745 JH |
180 | targets += vdso-n32.lds |
181 | targets += vdso-n32.so.dbg.raw vdso-n32.so.raw | |
182 | targets += vdso-n32.so.dbg vdso-n32.so | |
183 | targets += vdso-n32-image.c | |
ebb5e78c AS |
184 | |
185 | ifdef CONFIG_MIPS32_N32 | |
186 | ||
187 | obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o) | |
188 | ||
189 | $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32 | |
190 | $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32 | |
191 | ||
192 | $(obj)/%-n32.o: $(src)/%.S FORCE | |
b668970e | 193 | $(call if_changed_dep,vdsoas_o_S) |
ebb5e78c AS |
194 | |
195 | $(obj)/%-n32.o: $(src)/%.c FORCE | |
196 | $(call cmd,force_checksrc) | |
197 | $(call if_changed_rule,cc_o_c) | |
198 | ||
67fc5dc8 | 199 | $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32 |
ebb5e78c AS |
200 | $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE |
201 | $(call if_changed_dep,cpp_lds_S) | |
202 | ||
2afb9745 | 203 | $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE |
cdab7e2c | 204 | $(call if_changed,vdsold_and_vdso_check) |
ebb5e78c AS |
205 | |
206 | $(obj)/vdso-n32-image.c: VDSO_NAME := n32 | |
2afb9745 JH |
207 | $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \ |
208 | $(obj)/genvdso FORCE | |
ebb5e78c AS |
209 | $(call if_changed,genvdso) |
210 | ||
211 | obj-y += vdso-n32-image.o | |
212 | ||
213 | endif | |
214 | ||
215 | # FIXME: Need install rule for debug. | |
216 | # Needs to deal with dependency for generation of dbg by cmd_genvdso... |