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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
78
79#
80# Shared build commands.
81#
82
83quiet_cmd_vdsold_and_vdso_check = LD $@
84 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
85
86quiet_cmd_vdsold = VDSO $@
87 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
88 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
89
90quiet_cmd_vdsoas_o_S = AS $@
91 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
92
93# Strip rule for the raw .so files
94$(obj)/%.so.raw: OBJCOPYFLAGS := -S
95$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
96 $(call if_changed,objcopy)
97
98hostprogs-y := genvdso
99
100quiet_cmd_genvdso = GENVDSO $@
101define cmd_genvdso
102 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
103 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
104endef
105
106#
107# Build native VDSO.
108#
109
110native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
111
112targets += $(obj-vdso-y)
113targets += vdso.lds
114targets += vdso.so.dbg.raw vdso.so.raw
115targets += vdso.so.dbg vdso.so
116targets += vdso-image.c
117
118obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
119
120$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
121$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
122
123$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
124
125$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
126 $(call if_changed,vdsold_and_vdso_check)
127
128$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
129 $(obj)/genvdso FORCE
130 $(call if_changed,genvdso)
131
132obj-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.
139targets += $(obj-vdso-y:%.o=%-o32.o)
140targets += vdso-o32.lds
141targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
142targets += vdso-o32.so.dbg vdso-o32.so
143targets += vdso-o32-image.c
144
145ifdef CONFIG_MIPS32_O32
146
147obj-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
153 $(call if_changed_dep,vdsoas_o_S)
154
155$(obj)/%-o32.o: $(src)/%.c FORCE
156 $(call cmd,force_checksrc)
157 $(call if_changed_rule,cc_o_c)
158
159$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
160$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
161 $(call if_changed_dep,cpp_lds_S)
162
163$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
164 $(call if_changed,vdsold_and_vdso_check)
165
166$(obj)/vdso-o32-image.c: VDSO_NAME := o32
167$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
168 $(obj)/genvdso FORCE
169 $(call if_changed,genvdso)
170
171obj-y += vdso-o32-image.o
172
173endif
174
175#
176# Build N32 VDSO.
177#
178
179targets += $(obj-vdso-y:%.o=%-n32.o)
180targets += vdso-n32.lds
181targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
182targets += vdso-n32.so.dbg vdso-n32.so
183targets += vdso-n32-image.c
184
185ifdef CONFIG_MIPS32_N32
186
187obj-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
193 $(call if_changed_dep,vdsoas_o_S)
194
195$(obj)/%-n32.o: $(src)/%.c FORCE
196 $(call cmd,force_checksrc)
197 $(call if_changed_rule,cc_o_c)
198
199$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
200$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
201 $(call if_changed_dep,cpp_lds_S)
202
203$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
204 $(call if_changed,vdsold_and_vdso_check)
205
206$(obj)/vdso-n32-image.c: VDSO_NAME := n32
207$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
208 $(obj)/genvdso FORCE
209 $(call if_changed,genvdso)
210
211obj-y += vdso-n32-image.o
212
213endif
214
215# FIXME: Need install rule for debug.
216# Needs to deal with dependency for generation of dbg by cmd_genvdso...