Merge branch 'nvme-5.4' of git://git.infradead.org/nvme into for-linus
[linux-2.6-microblaze.git] / arch / mips / vdso / Makefile
1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
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
10
11 # Common compiler flags between ABIs.
12 ccflags-vdso := \
13         $(filter -I%,$(KBUILD_CFLAGS)) \
14         $(filter -E%,$(KBUILD_CFLAGS)) \
15         $(filter -mmicromips,$(KBUILD_CFLAGS)) \
16         $(filter -march=%,$(KBUILD_CFLAGS)) \
17         $(filter -m%-float,$(KBUILD_CFLAGS)) \
18         -D__VDSO__
19
20 ifdef CONFIG_CC_IS_CLANG
21 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
22 endif
23
24 #
25 # The -fno-jump-tables flag only prevents the compiler from generating
26 # jump tables but does not prevent the compiler from emitting absolute
27 # offsets.
28 cflags-vdso := $(ccflags-vdso) \
29         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
30         -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
31         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
32         $(call cc-option, -fno-asynchronous-unwind-tables) \
33         $(call cc-option, -fno-stack-protector)
34 aflags-vdso := $(ccflags-vdso) \
35         -D__ASSEMBLY__ -Wa,-gdwarf-2
36
37 ifneq ($(c-gettimeofday-y),)
38 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
39
40 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
41 # library on a 64bit kernel.
42 # Note: Needs to be included before than the generic library.
43 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
44 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45 endif
46
47 CFLAGS_REMOVE_vgettimeofday.o = -pg
48
49 #
50 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
51 # the base address of VDSO, the linker will emit a R_MIPS_PC32
52 # relocation in binutils > 2.25 but it will fail with older versions
53 # because that relocation is not supported for that symbol. As a result
54 # of which we are forced to disable the VDSO symbols when building
55 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
56 # can't use other methods to get the base address of VDSO please refer to
57 # the comments on that file.
58 #
59 ifndef CONFIG_CPU_MIPSR6
60   ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
61     $(warning MIPS VDSO requires binutils >= 2.25)
62     obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
63     ccflags-vdso += -DDISABLE_MIPS_VDSO
64   endif
65 endif
66
67 # VDSO linker flags.
68 VDSO_LDFLAGS := \
69         -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
70         $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
71         -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
72
73 CFLAGS_REMOVE_vdso.o = -pg
74
75 GCOV_PROFILE := n
76 UBSAN_SANITIZE := n
77
78 #
79 # Shared build commands.
80 #
81
82 quiet_cmd_vdsold_and_vdso_check = LD      $@
83       cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
84
85 quiet_cmd_vdsold = VDSO    $@
86       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
87                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
88
89 quiet_cmd_vdsoas_o_S = AS      $@
90       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
91
92 # Strip rule for the raw .so files
93 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
94 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
95         $(call if_changed,objcopy)
96
97 hostprogs-y := genvdso
98
99 quiet_cmd_genvdso = GENVDSO $@
100 define cmd_genvdso
101         $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
102         $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
103 endef
104
105 #
106 # Build native VDSO.
107 #
108
109 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
110
111 targets += $(obj-vdso-y)
112 targets += vdso.lds
113 targets += vdso.so.dbg.raw vdso.so.raw
114 targets += vdso.so.dbg vdso.so
115 targets += vdso-image.c
116
117 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
118
119 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
120 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
121
122 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
123
124 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
125         $(call if_changed,vdsold_and_vdso_check)
126
127 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
128                      $(obj)/genvdso FORCE
129         $(call if_changed,genvdso)
130
131 obj-y += vdso-image.o
132
133 #
134 # Build O32 VDSO.
135 #
136
137 # Define these outside the ifdef to ensure they are picked up by clean.
138 targets += $(obj-vdso-y:%.o=%-o32.o)
139 targets += vdso-o32.lds
140 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
141 targets += vdso-o32.so.dbg vdso-o32.so
142 targets += vdso-o32-image.c
143
144 ifdef CONFIG_MIPS32_O32
145
146 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
147
148 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
149 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
150
151 $(obj)/%-o32.o: $(src)/%.S FORCE
152         $(call if_changed_dep,vdsoas_o_S)
153
154 $(obj)/%-o32.o: $(src)/%.c FORCE
155         $(call cmd,force_checksrc)
156         $(call if_changed_rule,cc_o_c)
157
158 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
159 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
160         $(call if_changed_dep,cpp_lds_S)
161
162 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
163         $(call if_changed,vdsold_and_vdso_check)
164
165 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
166 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
167                          $(obj)/genvdso FORCE
168         $(call if_changed,genvdso)
169
170 obj-y += vdso-o32-image.o
171
172 endif
173
174 #
175 # Build N32 VDSO.
176 #
177
178 targets += $(obj-vdso-y:%.o=%-n32.o)
179 targets += vdso-n32.lds
180 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
181 targets += vdso-n32.so.dbg vdso-n32.so
182 targets += vdso-n32-image.c
183
184 ifdef CONFIG_MIPS32_N32
185
186 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
187
188 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
189 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
190
191 $(obj)/%-n32.o: $(src)/%.S FORCE
192         $(call if_changed_dep,vdsoas_o_S)
193
194 $(obj)/%-n32.o: $(src)/%.c FORCE
195         $(call cmd,force_checksrc)
196         $(call if_changed_rule,cc_o_c)
197
198 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
199 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
200         $(call if_changed_dep,cpp_lds_S)
201
202 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
203         $(call if_changed,vdsold_and_vdso_check)
204
205 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
206 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
207                          $(obj)/genvdso FORCE
208         $(call if_changed,genvdso)
209
210 obj-y += vdso-n32-image.o
211
212 endif
213
214 # FIXME: Need install rule for debug.
215 # Needs to deal with dependency for generation of dbg by cmd_genvdso...