1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
5 # the inclusion of generic Makefile.
6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
7 include $(srctree)/lib/vdso/Makefile
9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
11 # Common compiler flags between ABIs.
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)) \
23 ccflags-vdso += -DBUILD_VDSO32
27 # The -fno-jump-tables flag only prevents the compiler from generating
28 # jump tables but does not prevent the compiler from emitting absolute
30 cflags-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)
36 aflags-vdso := $(ccflags-vdso) \
37 -D__ASSEMBLY__ -Wa,-gdwarf-2
39 ifneq ($(c-gettimeofday-y),)
40 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
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.
45 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
46 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
49 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
51 ifdef CONFIG_MIPS_DISABLE_VDSO
52 ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
53 $(warning MIPS VDSO requires binutils >= 2.25)
55 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
59 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
60 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
61 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
63 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
69 # Check that we don't have PIC 'jalr t9' calls left
70 quiet_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
76 # Shared build commands.
79 quiet_cmd_vdsold_and_vdso_check = LD $@
80 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
82 quiet_cmd_vdsoas_o_S = AS $@
83 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
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)
92 quiet_cmd_genvdso = GENVDSO $@
94 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
95 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
102 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
104 targets += $(obj-vdso-y)
106 targets += vdso.so.dbg.raw vdso.so.raw
107 targets += vdso.so.dbg vdso.so
108 targets += vdso-image.c
110 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
112 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
113 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
115 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
117 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
118 $(call if_changed,vdsold_and_vdso_check)
120 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
122 $(call if_changed,genvdso)
124 obj-y += vdso-image.o
130 # Define these outside the ifdef to ensure they are picked up by clean.
131 targets += $(obj-vdso-y:%.o=%-o32.o)
132 targets += vdso-o32.lds
133 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
134 targets += vdso-o32.so.dbg vdso-o32.so
135 targets += vdso-o32-image.c
137 ifdef CONFIG_MIPS32_O32
139 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
141 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
142 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
144 $(obj)/%-o32.o: $(src)/%.S FORCE
145 $(call if_changed_dep,vdsoas_o_S)
147 $(obj)/%-o32.o: $(src)/%.c FORCE
148 $(call cmd,force_checksrc)
149 $(call if_changed_rule,cc_o_c)
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)
155 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
156 $(call if_changed,vdsold_and_vdso_check)
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 \
161 $(call if_changed,genvdso)
163 obj-y += vdso-o32-image.o
171 targets += $(obj-vdso-y:%.o=%-n32.o)
172 targets += vdso-n32.lds
173 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
174 targets += vdso-n32.so.dbg vdso-n32.so
175 targets += vdso-n32-image.c
177 ifdef CONFIG_MIPS32_N32
179 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
181 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
182 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
184 $(obj)/%-n32.o: $(src)/%.S FORCE
185 $(call if_changed_dep,vdsoas_o_S)
187 $(obj)/%-n32.o: $(src)/%.c FORCE
188 $(call cmd,force_checksrc)
189 $(call if_changed_rule,cc_o_c)
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)
195 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
196 $(call if_changed,vdsold_and_vdso_check)
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 \
201 $(call if_changed,genvdso)
203 obj-y += vdso-n32-image.o
207 # FIXME: Need install rule for debug.
208 # Needs to deal with dependency for generation of dbg by cmd_genvdso...