1 # SPDX-License-Identifier: GPL-2.0
3 # List of files in the vdso, has to be asm only for now
5 # Include the generic Makefile to check the built vdso.
6 include $(srctree)/lib/vdso/Makefile
8 obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o
9 obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o
11 ifneq ($(c-gettimeofday-y),)
12 CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y)
13 CFLAGS_vgettimeofday-32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
14 CFLAGS_vgettimeofday-32.o += $(call cc-option, -fno-stack-protector)
15 CFLAGS_vgettimeofday-32.o += -DDISABLE_BRANCH_PROFILING
16 CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables
17 CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE)
18 CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc
19 # This flag is supported by clang for 64-bit but not 32-bit so it will cause
20 # an unused command line flag warning for this file.
21 ifdef CONFIG_CC_IS_CLANG
22 CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection
24 CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y)
25 CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
26 CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector)
27 CFLAGS_vgettimeofday-64.o += -DDISABLE_BRANCH_PROFILING
28 CFLAGS_vgettimeofday-64.o += -ffreestanding -fasynchronous-unwind-tables
29 CFLAGS_REMOVE_vgettimeofday-64.o = $(CC_FLAGS_FTRACE)
30 # Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true
31 # by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is
32 # compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code
33 # generation is minimal, it will just use r29 instead.
34 CFLAGS_vgettimeofday-64.o += $(call cc-option, -ffixed-r30)
40 VDSOCC := $(CROSS32_COMPILE)gcc
45 targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o
46 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
47 targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o
48 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
56 ccflags-y := -fno-common -fno-builtin
57 ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
58 ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
59 ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
61 # Filter flags that clang will warn are unused for linking
62 ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS))
65 LD32FLAGS := -Wl,-soname=linux-vdso32.so.1
66 AS32FLAGS := -D__VDSO32__
68 LD64FLAGS := -Wl,-soname=linux-vdso64.so.1
69 AS64FLAGS := -D__VDSO64__
72 CPPFLAGS_vdso32.lds += -P -C -Upowerpc
74 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
76 # link rule for the .so file, .lds has to be first
77 $(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o FORCE
78 $(call if_changed,vdso32ld_and_check)
79 $(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o FORCE
80 $(call if_changed,vdso64ld_and_check)
82 # assembly rules for the .S files
83 $(obj-vdso32): %-32.o: %.S FORCE
84 $(call if_changed_dep,vdso32as)
85 $(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE
86 $(call if_changed_dep,vdso32cc)
87 $(obj-vdso64): %-64.o: %.S FORCE
88 $(call if_changed_dep,vdso64as)
89 $(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE
90 $(call if_changed_dep,cc_o_c)
92 # Generate VDSO offsets using helper script
93 gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh
94 quiet_cmd_vdso32sym = VDSO32SYM $@
95 cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@
96 gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh
97 quiet_cmd_vdso64sym = VDSO64SYM $@
98 cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@
100 include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
101 $(call if_changed,vdso32sym)
102 include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
103 $(call if_changed,vdso64sym)
105 # actual build commands
106 quiet_cmd_vdso32ld_and_check = VDSO32L $@
107 cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
108 quiet_cmd_vdso32as = VDSO32A $@
109 cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $<
110 quiet_cmd_vdso32cc = VDSO32C $@
111 cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $<
113 quiet_cmd_vdso64ld_and_check = VDSO64L $@
114 cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
115 quiet_cmd_vdso64as = VDSO64A $@
116 cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $<
118 OBJECT_FILES_NON_STANDARD := y