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	$(CLANG_FLAGS) \
20	-D__VDSO__
21
22ifndef CONFIG_64BIT
23ccflags-vdso += -DBUILD_VDSO32
24endif
25
26#
27# The -fno-jump-tables flag only prevents the compiler from generating
28# jump tables but does not prevent the compiler from emitting absolute
29# offsets.
30cflags-vdso := $(ccflags-vdso) \
31	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
32	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
33	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
34	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
35	$(call cc-option, -fno-asynchronous-unwind-tables)
36aflags-vdso := $(ccflags-vdso) \
37	-D__ASSEMBLY__ -Wa,-gdwarf-2
38
39ifneq ($(c-gettimeofday-y),)
40CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
41
42# config-n32-o32-env.c prepares the environment to build a 32bit vDSO
43# library on a 64bit kernel.
44# Note: Needs to be included before than the generic library.
45CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
46CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
47endif
48
49CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
50
51ifdef CONFIG_MIPS_DISABLE_VDSO
52  ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
53    $(warning MIPS VDSO requires binutils >= 2.25)
54  endif
55  obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
56endif
57
58# VDSO linker flags.
59ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
60	$(filter -E%,$(KBUILD_CFLAGS)) -shared \
61	-G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
62
63CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
64
65GCOV_PROFILE := n
66UBSAN_SANITIZE := n
67KCOV_INSTRUMENT := n
68
69# Check that we don't have PIC 'jalr t9' calls left
70quiet_cmd_vdso_mips_check = VDSOCHK $@
71      cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
72		       then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
73			     rm -f $@; /bin/false); fi
74
75#
76# Shared build commands.
77#
78
79quiet_cmd_vdsold_and_vdso_check = LD      $@
80      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
81
82quiet_cmd_vdsoas_o_S = AS      $@
83      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
84
85# Strip rule for the raw .so files
86$(obj)/%.so.raw: OBJCOPYFLAGS := -S
87$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
88	$(call if_changed,objcopy)
89
90hostprogs := genvdso
91
92quiet_cmd_genvdso = GENVDSO $@
93define cmd_genvdso
94	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
95	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
96endef
97
98#
99# Build native VDSO.
100#
101
102native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
103
104targets += $(obj-vdso-y)
105targets += vdso.lds
106targets += vdso.so.dbg.raw vdso.so.raw
107targets += vdso.so.dbg vdso.so
108targets += vdso-image.c
109
110obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
111
112$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
113$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
114
115$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
116
117$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
118	$(call if_changed,vdsold_and_vdso_check)
119
120$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
121                     $(obj)/genvdso FORCE
122	$(call if_changed,genvdso)
123
124obj-y += vdso-image.o
125
126#
127# Build O32 VDSO.
128#
129
130# Define these outside the ifdef to ensure they are picked up by clean.
131targets += $(obj-vdso-y:%.o=%-o32.o)
132targets += vdso-o32.lds
133targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
134targets += vdso-o32.so.dbg vdso-o32.so
135targets += vdso-o32-image.c
136
137ifdef CONFIG_MIPS32_O32
138
139obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
140
141$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
142$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
143
144$(obj)/%-o32.o: $(src)/%.S FORCE
145	$(call if_changed_dep,vdsoas_o_S)
146
147$(obj)/%-o32.o: $(src)/%.c FORCE
148	$(call cmd,force_checksrc)
149	$(call if_changed_rule,cc_o_c)
150
151$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
152$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
153	$(call if_changed_dep,cpp_lds_S)
154
155$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
156	$(call if_changed,vdsold_and_vdso_check)
157
158$(obj)/vdso-o32-image.c: VDSO_NAME := o32
159$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
160                         $(obj)/genvdso FORCE
161	$(call if_changed,genvdso)
162
163obj-y += vdso-o32-image.o
164
165endif
166
167#
168# Build N32 VDSO.
169#
170
171targets += $(obj-vdso-y:%.o=%-n32.o)
172targets += vdso-n32.lds
173targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
174targets += vdso-n32.so.dbg vdso-n32.so
175targets += vdso-n32-image.c
176
177ifdef CONFIG_MIPS32_N32
178
179obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
180
181$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
182$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
183
184$(obj)/%-n32.o: $(src)/%.S FORCE
185	$(call if_changed_dep,vdsoas_o_S)
186
187$(obj)/%-n32.o: $(src)/%.c FORCE
188	$(call cmd,force_checksrc)
189	$(call if_changed_rule,cc_o_c)
190
191$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
192$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
193	$(call if_changed_dep,cpp_lds_S)
194
195$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
196	$(call if_changed,vdsold_and_vdso_check)
197
198$(obj)/vdso-n32-image.c: VDSO_NAME := n32
199$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
200                         $(obj)/genvdso FORCE
201	$(call if_changed,genvdso)
202
203obj-y += vdso-n32-image.o
204
205endif
206
207# FIXME: Need install rule for debug.
208# Needs to deal with dependency for generation of dbg by cmd_genvdso...
209