xref: /linux/arch/mips/vdso/Makefile (revision 71e2f4dd5a65bd8dbca0b77661e75eea471168f8) 
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	-D__VDSO__
19
20ifdef CONFIG_CC_IS_CLANG
21ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
22endif
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.
28cflags-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)
34aflags-vdso := $(ccflags-vdso) \
35	-D__ASSEMBLY__ -Wa,-gdwarf-2
36
37ifneq ($(c-gettimeofday-y),)
38CFLAGS_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.
43CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
44CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45endif
46
47CFLAGS_REMOVE_vgettimeofday.o = -pg
48
49#
50# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
51# the base address of VDSO, the linker will emit a R_MIPS_PC32
52# relocation in binutils > 2.25 but it will fail with older versions
53# because that relocation is not supported for that symbol. As a result
54# of which we are forced to disable the VDSO symbols when building
55# with < 2.25 binutils on pre-R6 kernels. For more references on why we
56# can't use other methods to get the base address of VDSO please refer to
57# the comments on that file.
58#
59ifndef CONFIG_CPU_MIPSR6
60  ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
61    $(warning MIPS VDSO requires binutils >= 2.25)
62    obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
63    ccflags-vdso += -DDISABLE_MIPS_VDSO
64  endif
65endif
66
67# VDSO linker flags.
68VDSO_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
73CFLAGS_REMOVE_vdso.o = -pg
74
75GCOV_PROFILE := n
76UBSAN_SANITIZE := n
77
78#
79# Shared build commands.
80#
81
82quiet_cmd_vdsold_and_vdso_check = LD      $@
83      cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
84
85quiet_cmd_vdsold = VDSO    $@
86      cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
87                   -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
88
89quiet_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
97hostprogs-y := genvdso
98
99quiet_cmd_genvdso = GENVDSO $@
100define cmd_genvdso
101	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
102	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
103endef
104
105#
106# Build native VDSO.
107#
108
109native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
110
111targets += $(obj-vdso-y)
112targets += vdso.lds
113targets += vdso.so.dbg.raw vdso.so.raw
114targets += vdso.so.dbg vdso.so
115targets += vdso-image.c
116
117obj-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
131obj-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.
138targets += $(obj-vdso-y:%.o=%-o32.o)
139targets += vdso-o32.lds
140targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
141targets += vdso-o32.so.dbg vdso-o32.so
142targets += vdso-o32-image.c
143
144ifdef CONFIG_MIPS32_O32
145
146obj-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
170obj-y += vdso-o32-image.o
171
172endif
173
174#
175# Build N32 VDSO.
176#
177
178targets += $(obj-vdso-y:%.o=%-n32.o)
179targets += vdso-n32.lds
180targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
181targets += vdso-n32.so.dbg vdso-n32.so
182targets += vdso-n32-image.c
183
184ifdef CONFIG_MIPS32_N32
185
186obj-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
210obj-y += vdso-n32-image.o
211
212endif
213
214# FIXME: Need install rule for debug.
215# Needs to deal with dependency for generation of dbg by cmd_genvdso...
216