xref: /linux/arch/mips/vdso/Makefile (revision 9a6b55ac) 
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.
6ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
7include $(srctree)/lib/vdso/Makefile
8
9obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
10
11# Common compiler flags between ABIs.
12ccflags-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	$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
19	-D__VDSO__
20
21ifdef CONFIG_CC_IS_CLANG
22ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
23endif
24
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.
29cflags-vdso := $(ccflags-vdso) \
30	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
31	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
32	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
33	$(call cc-option, -fno-asynchronous-unwind-tables) \
34	$(call cc-option, -fno-stack-protector)
35aflags-vdso := $(ccflags-vdso) \
36	-D__ASSEMBLY__ -Wa,-gdwarf-2
37
38ifneq ($(c-gettimeofday-y),)
39CFLAGS_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.
44CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
46endif
47
48CFLAGS_REMOVE_vgettimeofday.o = -pg
49
50#
51# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
52# the base address of VDSO, the linker will emit a R_MIPS_PC32
53# relocation in binutils > 2.25 but it will fail with older versions
54# because that relocation is not supported for that symbol. As a result
55# of which we are forced to disable the VDSO symbols when building
56# with < 2.25 binutils on pre-R6 kernels. For more references on why we
57# can't use other methods to get the base address of VDSO please refer to
58# the comments on that file.
59#
60ifndef CONFIG_CPU_MIPSR6
61  ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
62    $(warning MIPS VDSO requires binutils >= 2.25)
63    obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
64    ccflags-vdso += -DDISABLE_MIPS_VDSO
65  endif
66endif
67
68# VDSO linker flags.
69VDSO_LDFLAGS := \
70	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
71	$(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
72	-nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
73
74CFLAGS_REMOVE_vdso.o = -pg
75
76GCOV_PROFILE := n
77UBSAN_SANITIZE := n
78KCOV_INSTRUMENT := n
79
80#
81# Shared build commands.
82#
83
84quiet_cmd_vdsold_and_vdso_check = LD      $@
85      cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
86
87quiet_cmd_vdsold = VDSO    $@
88      cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
89                   -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
90
91quiet_cmd_vdsoas_o_S = AS      $@
92      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
93
94# Strip rule for the raw .so files
95$(obj)/%.so.raw: OBJCOPYFLAGS := -S
96$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
97	$(call if_changed,objcopy)
98
99hostprogs-y := genvdso
100
101quiet_cmd_genvdso = GENVDSO $@
102define cmd_genvdso
103	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
104	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
105endef
106
107#
108# Build native VDSO.
109#
110
111native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
112
113targets += $(obj-vdso-y)
114targets += vdso.lds
115targets += vdso.so.dbg.raw vdso.so.raw
116targets += vdso.so.dbg vdso.so
117targets += vdso-image.c
118
119obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
120
121$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
122$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
123
124$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
125
126$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
127	$(call if_changed,vdsold_and_vdso_check)
128
129$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
130                     $(obj)/genvdso FORCE
131	$(call if_changed,genvdso)
132
133obj-y += vdso-image.o
134
135#
136# Build O32 VDSO.
137#
138
139# Define these outside the ifdef to ensure they are picked up by clean.
140targets += $(obj-vdso-y:%.o=%-o32.o)
141targets += vdso-o32.lds
142targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
143targets += vdso-o32.so.dbg vdso-o32.so
144targets += vdso-o32-image.c
145
146ifdef CONFIG_MIPS32_O32
147
148obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
149
150$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
151$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
152
153$(obj)/%-o32.o: $(src)/%.S FORCE
154	$(call if_changed_dep,vdsoas_o_S)
155
156$(obj)/%-o32.o: $(src)/%.c FORCE
157	$(call cmd,force_checksrc)
158	$(call if_changed_rule,cc_o_c)
159
160$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
161$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
162	$(call if_changed_dep,cpp_lds_S)
163
164$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
165	$(call if_changed,vdsold_and_vdso_check)
166
167$(obj)/vdso-o32-image.c: VDSO_NAME := o32
168$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
169                         $(obj)/genvdso FORCE
170	$(call if_changed,genvdso)
171
172obj-y += vdso-o32-image.o
173
174endif
175
176#
177# Build N32 VDSO.
178#
179
180targets += $(obj-vdso-y:%.o=%-n32.o)
181targets += vdso-n32.lds
182targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
183targets += vdso-n32.so.dbg vdso-n32.so
184targets += vdso-n32-image.c
185
186ifdef CONFIG_MIPS32_N32
187
188obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
189
190$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
191$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
192
193$(obj)/%-n32.o: $(src)/%.S FORCE
194	$(call if_changed_dep,vdsoas_o_S)
195
196$(obj)/%-n32.o: $(src)/%.c FORCE
197	$(call cmd,force_checksrc)
198	$(call if_changed_rule,cc_o_c)
199
200$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
201$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
202	$(call if_changed_dep,cpp_lds_S)
203
204$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
205	$(call if_changed,vdsold_and_vdso_check)
206
207$(obj)/vdso-n32-image.c: VDSO_NAME := n32
208$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
209                         $(obj)/genvdso FORCE
210	$(call if_changed,genvdso)
211
212obj-y += vdso-n32-image.o
213
214endif
215
216# FIXME: Need install rule for debug.
217# Needs to deal with dependency for generation of dbg by cmd_genvdso...
218