xref: /openbmc/linux/arch/mips/vdso/Makefile (revision 547840bd) 
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	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
37	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
38	$(call cc-option, -fno-asynchronous-unwind-tables) \
39	$(call cc-option, -fno-stack-protector)
40aflags-vdso := $(ccflags-vdso) \
41	-D__ASSEMBLY__ -Wa,-gdwarf-2
42
43ifneq ($(c-gettimeofday-y),)
44CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
45
46# config-n32-o32-env.c prepares the environment to build a 32bit vDSO
47# library on a 64bit kernel.
48# Note: Needs to be included before than the generic library.
49CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
50CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
51endif
52
53CFLAGS_REMOVE_vgettimeofday.o = -pg
54
55ifdef CONFIG_MIPS_DISABLE_VDSO
56  ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
57    $(warning MIPS VDSO requires binutils >= 2.25)
58  endif
59  obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
60endif
61
62# VDSO linker flags.
63ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
64	$(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
65	-G 0 --eh-frame-hdr --hash-style=sysv --build-id -T
66
67CFLAGS_REMOVE_vdso.o = -pg
68
69GCOV_PROFILE := n
70UBSAN_SANITIZE := n
71KCOV_INSTRUMENT := n
72
73# Check that we don't have PIC 'jalr t9' calls left
74quiet_cmd_vdso_mips_check = VDSOCHK $@
75      cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
76		       then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
77			     rm -f $@; /bin/false); fi
78
79#
80# Shared build commands.
81#
82
83quiet_cmd_vdsold_and_vdso_check = LD      $@
84      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
85
86quiet_cmd_vdsoas_o_S = AS      $@
87      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
88
89# Strip rule for the raw .so files
90$(obj)/%.so.raw: OBJCOPYFLAGS := -S
91$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
92	$(call if_changed,objcopy)
93
94hostprogs := genvdso
95
96quiet_cmd_genvdso = GENVDSO $@
97define cmd_genvdso
98	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
99	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
100endef
101
102#
103# Build native VDSO.
104#
105
106native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
107
108targets += $(obj-vdso-y)
109targets += vdso.lds
110targets += vdso.so.dbg.raw vdso.so.raw
111targets += vdso.so.dbg vdso.so
112targets += vdso-image.c
113
114obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
115
116$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
117$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
118
119$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
120
121$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
122	$(call if_changed,vdsold_and_vdso_check)
123
124$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
125                     $(obj)/genvdso FORCE
126	$(call if_changed,genvdso)
127
128obj-y += vdso-image.o
129
130#
131# Build O32 VDSO.
132#
133
134# Define these outside the ifdef to ensure they are picked up by clean.
135targets += $(obj-vdso-y:%.o=%-o32.o)
136targets += vdso-o32.lds
137targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
138targets += vdso-o32.so.dbg vdso-o32.so
139targets += vdso-o32-image.c
140
141ifdef CONFIG_MIPS32_O32
142
143obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
144
145$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
146$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
147
148$(obj)/%-o32.o: $(src)/%.S FORCE
149	$(call if_changed_dep,vdsoas_o_S)
150
151$(obj)/%-o32.o: $(src)/%.c FORCE
152	$(call cmd,force_checksrc)
153	$(call if_changed_rule,cc_o_c)
154
155$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
156$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
157	$(call if_changed_dep,cpp_lds_S)
158
159$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
160	$(call if_changed,vdsold_and_vdso_check)
161
162$(obj)/vdso-o32-image.c: VDSO_NAME := o32
163$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
164                         $(obj)/genvdso FORCE
165	$(call if_changed,genvdso)
166
167obj-y += vdso-o32-image.o
168
169endif
170
171#
172# Build N32 VDSO.
173#
174
175targets += $(obj-vdso-y:%.o=%-n32.o)
176targets += vdso-n32.lds
177targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
178targets += vdso-n32.so.dbg vdso-n32.so
179targets += vdso-n32-image.c
180
181ifdef CONFIG_MIPS32_N32
182
183obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
184
185$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
186$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
187
188$(obj)/%-n32.o: $(src)/%.S FORCE
189	$(call if_changed_dep,vdsoas_o_S)
190
191$(obj)/%-n32.o: $(src)/%.c FORCE
192	$(call cmd,force_checksrc)
193	$(call if_changed_rule,cc_o_c)
194
195$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
196$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
197	$(call if_changed_dep,cpp_lds_S)
198
199$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
200	$(call if_changed,vdsold_and_vdso_check)
201
202$(obj)/vdso-n32-image.c: VDSO_NAME := n32
203$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
204                         $(obj)/genvdso FORCE
205	$(call if_changed,genvdso)
206
207obj-y += vdso-n32-image.o
208
209endif
210
211# FIXME: Need install rule for debug.
212# Needs to deal with dependency for generation of dbg by cmd_genvdso...
213