xref: /openbmc/linux/arch/mips/vdso/Makefile (revision f8e17c17) 
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
21ifndef CONFIG_64BIT
22ccflags-vdso += -DBUILD_VDSO32
23endif
24
25ifdef CONFIG_CC_IS_CLANG
26ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
27endif
28
29#
30# The -fno-jump-tables flag only prevents the compiler from generating
31# jump tables but does not prevent the compiler from emitting absolute
32# offsets.
33cflags-vdso := $(ccflags-vdso) \
34	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
35	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
36	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
37	$(call cc-option, -fno-asynchronous-unwind-tables) \
38	$(call cc-option, -fno-stack-protector)
39aflags-vdso := $(ccflags-vdso) \
40	-D__ASSEMBLY__ -Wa,-gdwarf-2
41
42ifneq ($(c-gettimeofday-y),)
43CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
44
45# config-n32-o32-env.c prepares the environment to build a 32bit vDSO
46# library on a 64bit kernel.
47# Note: Needs to be included before than the generic library.
48CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
49CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
50endif
51
52CFLAGS_REMOVE_vgettimeofday.o = -pg
53
54#
55# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
56# the base address of VDSO, the linker will emit a R_MIPS_PC32
57# relocation in binutils > 2.25 but it will fail with older versions
58# because that relocation is not supported for that symbol. As a result
59# of which we are forced to disable the VDSO symbols when building
60# with < 2.25 binutils on pre-R6 kernels. For more references on why we
61# can't use other methods to get the base address of VDSO please refer to
62# the comments on that file.
63#
64ifndef CONFIG_CPU_MIPSR6
65  ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
66    $(warning MIPS VDSO requires binutils >= 2.25)
67    obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
68    ccflags-vdso += -DDISABLE_MIPS_VDSO
69  endif
70endif
71
72# VDSO linker flags.
73VDSO_LDFLAGS := \
74	-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
75	$(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
76	-nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
77
78CFLAGS_REMOVE_vdso.o = -pg
79
80GCOV_PROFILE := n
81UBSAN_SANITIZE := n
82KCOV_INSTRUMENT := n
83
84#
85# Shared build commands.
86#
87
88quiet_cmd_vdsold_and_vdso_check = LD      $@
89      cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
90
91quiet_cmd_vdsold = VDSO    $@
92      cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
93                   -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
94
95quiet_cmd_vdsoas_o_S = AS      $@
96      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
97
98# Strip rule for the raw .so files
99$(obj)/%.so.raw: OBJCOPYFLAGS := -S
100$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
101	$(call if_changed,objcopy)
102
103hostprogs := genvdso
104
105quiet_cmd_genvdso = GENVDSO $@
106define cmd_genvdso
107	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
108	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
109endef
110
111#
112# Build native VDSO.
113#
114
115native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
116
117targets += $(obj-vdso-y)
118targets += vdso.lds
119targets += vdso.so.dbg.raw vdso.so.raw
120targets += vdso.so.dbg vdso.so
121targets += vdso-image.c
122
123obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
124
125$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
126$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
127
128$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
129
130$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
131	$(call if_changed,vdsold_and_vdso_check)
132
133$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
134                     $(obj)/genvdso FORCE
135	$(call if_changed,genvdso)
136
137obj-y += vdso-image.o
138
139#
140# Build O32 VDSO.
141#
142
143# Define these outside the ifdef to ensure they are picked up by clean.
144targets += $(obj-vdso-y:%.o=%-o32.o)
145targets += vdso-o32.lds
146targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
147targets += vdso-o32.so.dbg vdso-o32.so
148targets += vdso-o32-image.c
149
150ifdef CONFIG_MIPS32_O32
151
152obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
153
154$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
155$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
156
157$(obj)/%-o32.o: $(src)/%.S FORCE
158	$(call if_changed_dep,vdsoas_o_S)
159
160$(obj)/%-o32.o: $(src)/%.c FORCE
161	$(call cmd,force_checksrc)
162	$(call if_changed_rule,cc_o_c)
163
164$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
165$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
166	$(call if_changed_dep,cpp_lds_S)
167
168$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
169	$(call if_changed,vdsold_and_vdso_check)
170
171$(obj)/vdso-o32-image.c: VDSO_NAME := o32
172$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
173                         $(obj)/genvdso FORCE
174	$(call if_changed,genvdso)
175
176obj-y += vdso-o32-image.o
177
178endif
179
180#
181# Build N32 VDSO.
182#
183
184targets += $(obj-vdso-y:%.o=%-n32.o)
185targets += vdso-n32.lds
186targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
187targets += vdso-n32.so.dbg vdso-n32.so
188targets += vdso-n32-image.c
189
190ifdef CONFIG_MIPS32_N32
191
192obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
193
194$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
195$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
196
197$(obj)/%-n32.o: $(src)/%.S FORCE
198	$(call if_changed_dep,vdsoas_o_S)
199
200$(obj)/%-n32.o: $(src)/%.c FORCE
201	$(call cmd,force_checksrc)
202	$(call if_changed_rule,cc_o_c)
203
204$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
205$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
206	$(call if_changed_dep,cpp_lds_S)
207
208$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
209	$(call if_changed,vdsold_and_vdso_check)
210
211$(obj)/vdso-n32-image.c: VDSO_NAME := n32
212$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
213                         $(obj)/genvdso FORCE
214	$(call if_changed,genvdso)
215
216obj-y += vdso-n32-image.o
217
218endif
219
220# FIXME: Need install rule for debug.
221# Needs to deal with dependency for generation of dbg by cmd_genvdso...
222