xref: /linux/arch/powerpc/kernel/vdso/Makefile (revision 5f60d5f6bbc12e782fac78110b0ee62698f3b576)
1# SPDX-License-Identifier: GPL-2.0
2
3# List of files in the vdso, has to be asm only for now
4
5# Include the generic Makefile to check the built vdso.
6include $(srctree)/lib/vdso/Makefile
7
8obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o
9obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o
10
11obj-vdso32 += getrandom-32.o vgetrandom-chacha-32.o
12obj-vdso64 += getrandom-64.o vgetrandom-chacha-64.o
13
14ifneq ($(c-gettimeofday-y),)
15  CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y)
16# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true
17# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is
18# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code
19# generation is minimal, it will just use r29 instead.
20  CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) $(call cc-option, -ffixed-r30)
21endif
22
23ifneq ($(c-getrandom-y),)
24  CFLAGS_vgetrandom-32.o += -include $(c-getrandom-y)
25  CFLAGS_vgetrandom-64.o += -include $(c-getrandom-y) $(call cc-option, -ffixed-r30)
26endif
27
28# Build rules
29
30ifdef CROSS32_COMPILE
31    VDSOCC := $(CROSS32_COMPILE)gcc
32else
33    VDSOCC := $(CC)
34endif
35
36targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o vgetrandom-32.o
37targets += crtsavres-32.o
38obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
39targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o vgetrandom-64.o
40obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
41
42ccflags-y := -fno-common -fno-builtin -DBUILD_VDSO
43ccflags-y += $(DISABLE_LATENT_ENTROPY_PLUGIN)
44ccflags-y += $(call cc-option, -fno-stack-protector)
45ccflags-y += -DDISABLE_BRANCH_PROFILING
46ccflags-y += -ffreestanding -fasynchronous-unwind-tables
47ccflags-remove-y := $(CC_FLAGS_FTRACE)
48ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
49ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
50ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
51
52# Filter flags that clang will warn are unused for linking
53ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS))
54
55CC32FLAGS := -m32
56CC32FLAGSREMOVE := -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc
57  # This flag is supported by clang for 64-bit but not 32-bit so it will cause
58  # an unused command line flag warning for this file.
59ifdef CONFIG_CC_IS_CLANG
60CC32FLAGSREMOVE += -fno-stack-clash-protection
61endif
62LD32FLAGS := -Wl,-soname=linux-vdso32.so.1
63AS32FLAGS := -D__VDSO32__
64
65LD64FLAGS := -Wl,-soname=linux-vdso64.so.1
66AS64FLAGS := -D__VDSO64__
67
68targets += vdso32.lds
69CPPFLAGS_vdso32.lds += -P -C -Upowerpc
70targets += vdso64.lds
71CPPFLAGS_vdso64.lds += -P -C
72
73# link rule for the .so file, .lds has to be first
74$(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o $(obj)/vgetrandom-32.o $(obj)/crtsavres-32.o FORCE
75	$(call if_changed,vdso32ld_and_check)
76$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o $(obj)/vgetrandom-64.o FORCE
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/powerpc/lib/crtsavres.S FORCE
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
96gen-vdso32sym := $(src)/gen_vdso32_offsets.sh
97quiet_cmd_vdso32sym = VDSO32SYM $@
98      cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@
99gen-vdso64sym := $(src)/gen_vdso64_offsets.sh
100quiet_cmd_vdso64sym = VDSO64SYM $@
101      cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@
102
103include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
104	$(call if_changed,vdso32sym)
105include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
106	$(call if_changed,vdso64sym)
107
108# actual build commands
109quiet_cmd_vdso32ld_and_check = VDSO32L $@
110      cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
111quiet_cmd_vdso32as = VDSO32A $@
112      cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $<
113quiet_cmd_vdso32cc = VDSO32C $@
114      cmd_vdso32cc = $(VDSOCC) $(filter-out $(CC32FLAGSREMOVE), $(c_flags)) $(CC32FLAGS) -c -o $@ $<
115
116quiet_cmd_vdso64ld_and_check = VDSO64L $@
117      cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
118quiet_cmd_vdso64as = VDSO64A $@
119      cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $<
120