1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Makefile for vdso32
4 #
5
6 include $(srctree)/lib/vdso/Makefile
7
8 # Same as cc-*option, but using CC_COMPAT inst
9 ifeq ($(CONFIG_CC_IS_CLANG), y)
10 CC_COMPAT ?= $(CC)
11 CC_COMPAT += --target=arm-linux-gnueabi
12 else
13 CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
14 endif
15
16 ifeq ($(CONFIG_LD_IS_LLD), y)
17 LD_COMPAT ?= $(LD)
18 else
19 LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld
20 endif
21
22 cc32-option = $(call try-run,\
23 $(CC_COMPAT) $(1) -c -x c /dev/null -o
24 cc32-disable-warning = $(call try-run,\
25 $(CC_COMPAT) -W$(strip $(1)) -c -x c /
26
27 # We cannot use the global flags to compile th
28 # being that the 32-bit compiler may be older
29 # and therefore may not understand flags set u
30 # arch-specific options should be taken from t
31 # arm64 one.
32 # As a result we set our own flags here.
33
34 # KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-
35 VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -no
36 VDSO_CPPFLAGS += -isystem $(shell $(CC_COMPAT)
37 VDSO_CPPFLAGS += $(LINUXINCLUDE)
38
39 # Common C and assembly flags
40 # From top-level Makefile
41 VDSO_CAFLAGS := $(VDSO_CPPFLAGS)
42 VDSO_CAFLAGS += $(call cc32-option,-fno-PIE)
43 ifdef CONFIG_DEBUG_INFO
44 VDSO_CAFLAGS += -g
45 endif
46
47 # From arm Makefile
48 VDSO_CAFLAGS += $(call cc32-option,-fno-dwarf2
49 VDSO_CAFLAGS += -mabi=aapcs-linux -mfloat-abi=
50 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
51 VDSO_CAFLAGS += -mbig-endian
52 else
53 VDSO_CAFLAGS += -mlittle-endian
54 endif
55
56 # From arm vDSO Makefile
57 VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-
58 VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
59 VDSO_CAFLAGS += -march=armv8-a
60
61 VDSO_CFLAGS := $(VDSO_CAFLAGS)
62 VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1
63 # KBUILD_CFLAGS from top-level Makefile
64 VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototyp
65 -fno-strict-aliasing -fno-commo
66 -Werror-implicit-function-decla
67 -Wno-format-security \
68 -std=gnu11
69 VDSO_CFLAGS += -O2
70 # Some useful compiler-dependent flags from to
71 VDSO_CFLAGS += $(call cc32-option,-Wno-pointer
72 VDSO_CFLAGS += -fno-strict-overflow
73 VDSO_CFLAGS += $(call cc32-option,-Werror=stri
74 VDSO_CFLAGS += -Werror=date-time
75 VDSO_CFLAGS += $(call cc32-option,-Werror=inco
76
77 # The 32-bit compiler does not provide 128-bit
78 # some headers that are indirectly included fr
79 # This hack makes the compiler happy and shoul
80 # variables of such type are referenced.
81 VDSO_CFLAGS += -D__uint128_t='void*'
82 # Silence some warnings coming from headers th
83 # (on GCC 4.8 or older, there is unfortunately
84 VDSO_CFLAGS += $(call cc32-disable-warning,shi
85 VDSO_CFLAGS += -Wno-int-to-pointer-cast
86
87 # Compile as THUMB2 or ARM. Unwinding via fram
88 # unreliable.
89 ifeq ($(CONFIG_THUMB2_COMPAT_VDSO), y)
90 VDSO_CFLAGS += -mthumb -fomit-frame-pointer
91 else
92 VDSO_CFLAGS += -marm
93 endif
94
95 VDSO_AFLAGS := $(VDSO_CAFLAGS)
96 VDSO_AFLAGS += -D__ASSEMBLY__
97
98 # From arm vDSO Makefile
99 VDSO_LDFLAGS += -Bsymbolic --no-undefined -son
100 VDSO_LDFLAGS += -z max-page-size=4096 -z commo
101 VDSO_LDFLAGS += -shared --build-id=sha1
102 VDSO_LDFLAGS += --orphan-handling=$(CONFIG_LD_
103
104
105 # Borrow vdsomunge.c from the arm vDSO
106 # We have to use a relative path because scrip
107 # $(hostprogs) with $(obj)
108 munge := ../../../arm/vdso/vdsomunge
109 hostprogs := $(munge)
110
111 c-obj-vdso := note.o
112 c-obj-vdso-gettimeofday := vgettimeofday.o
113
114 ifneq ($(c-gettimeofday-y),)
115 VDSO_CFLAGS_gettimeofday_o += -include $(c-get
116 endif
117
118 VDSO_CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAG
119
120 # Build rules
121 targets := $(c-obj-vdso) $(c-obj-vdso-gettimeo
122 c-obj-vdso := $(addprefix $(obj)/, $(c-obj-vds
123 c-obj-vdso-gettimeofday := $(addprefix $(obj)/
124 asm-obj-vdso := $(addprefix $(obj)/, $(asm-obj
125 obj-vdso := $(c-obj-vdso) $(c-obj-vdso-gettime
126
127 targets += vdso.lds
128 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
129
130 # Strip rule for vdso.so
131 $(obj)/vdso.so: OBJCOPYFLAGS := -S
132 $(obj)/vdso.so: $(obj)/vdso32.so.dbg FORCE
133 $(call if_changed,objcopy)
134
135 $(obj)/vdso32.so.dbg: $(obj)/vdso.so.raw $(obj
136 $(call if_changed,vdsomunge)
137
138 # Link rule for the .so file, .lds has to be f
139 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso
140 $(call if_changed,vdsold_and_vdso_chec
141
142 # Compilation rules for the vDSO sources
143 $(c-obj-vdso): %.o: %.c FORCE
144 $(call if_changed_dep,vdsocc)
145 $(c-obj-vdso-gettimeofday): %.o: %.c FORCE
146 $(call if_changed_dep,vdsocc_gettimeof
147 $(asm-obj-vdso): %.o: %.S FORCE
148 $(call if_changed_dep,vdsoas)
149
150 # Actual build commands
151 quiet_cmd_vdsold_and_vdso_check = LD32 $@
152 cmd_vdsold_and_vdso_check = $(cmd_vdsold
153
154 quiet_cmd_vdsold = LD32 $@
155 cmd_vdsold = $(LD_COMPAT) $(VDSO_LDFLAGS
156 -T $(filter %.lds,$^) $(fil
157 quiet_cmd_vdsocc = CC32 $@
158 cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depf
159 quiet_cmd_vdsocc_gettimeofday = CC32 $@
160 cmd_vdsocc_gettimeofday = $(CC_COMPAT) -
161 quiet_cmd_vdsoas = AS32 $@
162 cmd_vdsoas = $(CC_COMPAT) -Wp,-MD,$(depf
163
164 quiet_cmd_vdsomunge = MUNGE $@
165 cmd_vdsomunge = $(obj)/$(munge) $< $@
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