1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Building vDSO images for x86.
4 #
5
6 # Include the generic Makefile to check the bu
7 include $(srctree)/lib/vdso/Makefile
8
9 # Files to link into the vDSO:
10 vobjs-y := vdso-note.o vclock_gettime.o vgetcp
11 vobjs32-y := vdso32/note.o vdso32/system_call.
12 vobjs32-y += vdso32/vclock_gettime.o vdso32/vg
13 vobjs-$(CONFIG_X86_SGX) += vsgx.o
14
15 # Files to link into the kernel:
16 obj-y
17
18 # vDSO images to build:
19 obj-$(CONFIG_X86_64)
20 obj-$(CONFIG_X86_X32_ABI)
21 obj-$(CONFIG_COMPAT_32)
22
23 vobjs := $(addprefix $(obj)/, $(vobjs-y))
24 vobjs32 := $(addprefix $(obj)/, $(vobjs32-y))
25
26 $(obj)/vdso.o: $(obj)/vdso.so
27
28 targets += vdso.lds $(vobjs-y)
29 targets += vdso32/vdso32.lds $(vobjs32-y)
30
31 targets += $(foreach x, 64 x32 32, vdso-image-
32
33 CPPFLAGS_vdso.lds += -P -C
34
35 VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -soname
36 -z max-page-size=4096
37
38 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs)
39 $(call if_changed,vdso_and_check)
40
41 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
42 hostprogs += vdso2c
43
44 quiet_cmd_vdso2c = VDSO2C $@
45 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=
46
47 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(o
48 $(call if_changed,vdso2c)
49
50 #
51 # Don't omit frame pointers for ease of usersp
52 # optimize sibling calls.
53 #
54 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -
55 $(filter -g%,$(KBUILD_CFLAGS)) -fno-sta
56 -fno-omit-frame-pointer -foptimize-sibl
57 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
58
59 ifdef CONFIG_MITIGATION_RETPOLINE
60 ifneq ($(RETPOLINE_VDSO_CFLAGS),)
61 CFL += $(RETPOLINE_VDSO_CFLAGS)
62 endif
63 endif
64
65 $(vobjs): KBUILD_CFLAGS := $(filter-out $(PADD
66 $(vobjs): KBUILD_AFLAGS += -DBUILD_VDSO
67
68 #
69 # vDSO code runs in userspace and -pg doesn't
70 #
71 CFLAGS_REMOVE_vclock_gettime.o = -pg
72 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
73 CFLAGS_REMOVE_vgetcpu.o = -pg
74 CFLAGS_REMOVE_vdso32/vgetcpu.o = -pg
75 CFLAGS_REMOVE_vsgx.o = -pg
76 CFLAGS_REMOVE_vgetrandom.o = -pg
77
78 #
79 # X32 processes use x32 vDSO to access 64bit k
80 #
81 # Build x32 vDSO image:
82 # 1. Compile x32 vDSO as 64bit.
83 # 2. Convert object files to x32.
84 # 3. Build x32 VDSO image with x32 objects, wh
85 # so that it can reach 64bit address space wit
86 #
87
88 CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
89 VDSO_LDFLAGS_vdsox32.lds = -m elf32_x86_64 -so
90 -z max-page-size=40
91
92 # x32-rebranded versions
93 vobjx32s-y := $(vobjs-y:.o=-x32.o)
94
95 # same thing, but in the output directory
96 vobjx32s := $(addprefix $(obj)/, $(vobjx32s-y)
97
98 # Convert 64bit object file to x32 for x32 vDS
99 quiet_cmd_x32 = X32 $@
100 cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $<
101
102 $(obj)/%-x32.o: $(obj)/%.o FORCE
103 $(call if_changed,x32)
104
105 targets += vdsox32.lds $(vobjx32s-y)
106
107 $(obj)/%.so: OBJCOPYFLAGS := -S --remove-secti
108 $(obj)/%.so: $(obj)/%.so.dbg FORCE
109 $(call if_changed,objcopy)
110
111 $(obj)/vdsox32.so.dbg: $(obj)/vdsox32.lds $(vo
112 $(call if_changed,vdso_and_check)
113
114 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.l
115 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -soname
116
117 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD
118 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD
119 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64)
120
121 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD
122 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kern
123 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KB
124 KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KB
125 KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_
126 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS
127 KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_C
128 KBUILD_CFLAGS_32 := $(filter-out $(CC_FLAGS_LT
129 KBUILD_CFLAGS_32 := $(filter-out $(CC_FLAGS_CF
130 KBUILD_CFLAGS_32 := $(filter-out $(PADDING_CFL
131 KBUILD_CFLAGS_32 += -m32 -msoft-float -mregpar
132 KBUILD_CFLAGS_32 += -fno-stack-protector
133 KBUILD_CFLAGS_32 += $(call cc-option, -foptimi
134 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
135 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
136
137 ifdef CONFIG_MITIGATION_RETPOLINE
138 ifneq ($(RETPOLINE_VDSO_CFLAGS),)
139 KBUILD_CFLAGS_32 += $(RETPOLINE_VDSO_CFLAGS)
140 endif
141 endif
142
143 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD
144
145 $(obj)/vdso32.so.dbg: $(obj)/vdso32/vdso32.lds
146 $(call if_changed,vdso_and_check)
147
148 #
149 # The DSO images are built using a special lin
150 #
151 quiet_cmd_vdso = VDSO $@
152 cmd_vdso = $(LD) -o $@ \
153 $(VDSO_LDFLAGS) $(VDSO_
154 -T $(filter %.lds,$^) $
155 sh $(src)/checkundef.sh '$(NM
156
157 VDSO_LDFLAGS = -shared --hash-style=both --bui
158 $(call ld-option, --eh-frame-hdr) -Bsy
159
160 quiet_cmd_vdso_and_check = VDSO $@
161 cmd_vdso_and_check = $(cmd_vdso); $(cmd_
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