1 # SPDX-License-Identifier: GPL-2.0
2
3 # List of files in the vdso, has to be asm onl
4
5 # Include the generic Makefile to check the bu
6 include $(srctree)/lib/vdso/Makefile
7
8 obj-vdso32 = sigtramp32-32.o gettimeofday-32.o
9 obj-vdso64 = sigtramp64-64.o gettimeofday-64.o
10
11 obj-vdso32 += getrandom-32.o vgetrandom-chacha
12 obj-vdso64 += getrandom-64.o vgetrandom-chacha
13
14 ifneq ($(c-gettimeofday-y),)
15 CFLAGS_vgettimeofday-32.o += -include $(c-ge
16 # Go prior to 1.16.x assumes r30 is not clobbe
17 # by accident when the VDSO was hand-written a
18 # compiler generated. To avoid breaking Go tel
19 # generation is minimal, it will just use r29
20 CFLAGS_vgettimeofday-64.o += -include $(c-ge
21 endif
22
23 ifneq ($(c-getrandom-y),)
24 CFLAGS_vgetrandom-32.o += -include $(c-getra
25 CFLAGS_vgetrandom-64.o += -include $(c-getra
26 endif
27
28 # Build rules
29
30 ifdef CROSS32_COMPILE
31 VDSOCC := $(CROSS32_COMPILE)gcc
32 else
33 VDSOCC := $(CC)
34 endif
35
36 targets := $(obj-vdso32) vdso32.so.dbg vgettim
37 targets += crtsavres-32.o
38 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso3
39 targets += $(obj-vdso64) vdso64.so.dbg vgettim
40 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso6
41
42 ccflags-y := -fno-common -fno-builtin -DBUILD_
43 ccflags-y += $(DISABLE_LATENT_ENTROPY_PLUGIN)
44 ccflags-y += $(call cc-option, -fno-stack-prot
45 ccflags-y += -DDISABLE_BRANCH_PROFILING
46 ccflags-y += -ffreestanding -fasynchronous-unw
47 ccflags-remove-y := $(CC_FLAGS_FTRACE)
48 ldflags-y := -Wl,--hash-style=both -nostdlib -
49 ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-optio
50 ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orph
51
52 # Filter flags that clang will warn are unused
53 ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_Z
54
55 CC32FLAGS := -m32
56 CC32FLAGSREMOVE := -mcmodel=medium -mabi=elfv1
57 # This flag is supported by clang for 64-bit
58 # an unused command line flag warning for th
59 ifdef CONFIG_CC_IS_CLANG
60 CC32FLAGSREMOVE += -fno-stack-clash-protection
61 endif
62 LD32FLAGS := -Wl,-soname=linux-vdso32.so.1
63 AS32FLAGS := -D__VDSO32__
64
65 LD64FLAGS := -Wl,-soname=linux-vdso64.so.1
66 AS64FLAGS := -D__VDSO64__
67
68 targets += vdso32.lds
69 CPPFLAGS_vdso32.lds += -P -C -Upowerpc
70 targets += vdso64.lds
71 CPPFLAGS_vdso64.lds += -P -C
72
73 # link rule for the .so file, .lds has to be f
74 $(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-
75 $(call if_changed,vdso32ld_and_check)
76 $(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-
77 $(call if_changed,vdso64ld_and_check)
78
79 # assembly rules for the .S files
80 $(obj-vdso32): %-32.o: %.S FORCE
81 $(call if_changed_dep,vdso32as)
82 $(obj)/crtsavres-32.o: %-32.o: $(srctree)/arch
83 $(call if_changed_dep,vdso32as)
84 $(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE
85 $(call if_changed_dep,vdso32cc)
86 $(obj)/vgetrandom-32.o: %-32.o: %.c FORCE
87 $(call if_changed_dep,vdso32cc)
88 $(obj-vdso64): %-64.o: %.S FORCE
89 $(call if_changed_dep,vdso64as)
90 $(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE
91 $(call if_changed_dep,cc_o_c)
92 $(obj)/vgetrandom-64.o: %-64.o: %.c FORCE
93 $(call if_changed_dep,cc_o_c)
94
95 # Generate VDSO offsets using helper script
96 gen-vdso32sym := $(src)/gen_vdso32_offsets.sh
97 quiet_cmd_vdso32sym = VDSO32SYM $@
98 cmd_vdso32sym = $(NM) $< | $(gen-vdso32s
99 gen-vdso64sym := $(src)/gen_vdso64_offsets.sh
100 quiet_cmd_vdso64sym = VDSO64SYM $@
101 cmd_vdso64sym = $(NM) $< | $(gen-vdso64s
102
103 include/generated/vdso32-offsets.h: $(obj)/vds
104 $(call if_changed,vdso32sym)
105 include/generated/vdso64-offsets.h: $(obj)/vds
106 $(call if_changed,vdso64sym)
107
108 # actual build commands
109 quiet_cmd_vdso32ld_and_check = VDSO32L $@
110 cmd_vdso32ld_and_check = $(VDSOCC) $(ldf
111 quiet_cmd_vdso32as = VDSO32A $@
112 cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC
113 quiet_cmd_vdso32cc = VDSO32C $@
114 cmd_vdso32cc = $(VDSOCC) $(filter-out $(
115
116 quiet_cmd_vdso64ld_and_check = VDSO64L $@
117 cmd_vdso64ld_and_check = $(VDSOCC) $(ldf
118 quiet_cmd_vdso64as = VDSO64A $@
119 cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS
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