1# SPDX-License-Identifier: GPL-2.0
2# List of files in the vdso, has to be asm only for now
3
4ARCH_REL_TYPE_ABS := R_PPC_JUMP_SLOT|R_PPC_GLOB_DAT|R_PPC_ADDR32|R_PPC_ADDR24|R_PPC_ADDR16|R_PPC_ADDR16_LO|R_PPC_ADDR16_HI|R_PPC_ADDR16_HA|R_PPC_ADDR14|R_PPC_ADDR14_BRTAKEN|R_PPC_ADDR14_BRNTAKEN|R_PPC_REL24
5include $(srctree)/lib/vdso/Makefile
6
7obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o
8
9ifneq ($(c-gettimeofday-y),)
10  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
11  CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
12  CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
13  CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
14  CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
15  CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
16endif
17
18# Build rules
19
20targets := $(obj-vdso64) vdso64.so.dbg vgettimeofday.o
21obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
22
23GCOV_PROFILE := n
24KCOV_INSTRUMENT := n
25UBSAN_SANITIZE := n
26KASAN_SANITIZE := n
27
28ccflags-y := -shared -fno-common -fno-builtin -nostdlib \
29	-Wl,-soname=linux-vdso64.so.1 -Wl,--hash-style=both
30
31# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true
32# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is
33# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code
34# generation is minimal, it will just use r29 instead.
35ccflags-y += $(call cc-option, -ffixed-r30)
36
37asflags-y := -D__VDSO64__ -s
38
39targets += vdso64.lds
40CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
41
42# link rule for the .so file, .lds has to be first
43$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday.o FORCE
44	$(call if_changed,vdso64ld_and_check)
45
46# Generate VDSO offsets using helper script
47gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
48quiet_cmd_vdsosym = VDSOSYM $@
49      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
50
51include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
52	$(call if_changed,vdsosym)
53
54# actual build commands
55quiet_cmd_vdso64ld_and_check = VDSO64L $@
56      cmd_vdso64ld_and_check = $(CC) $(c_flags) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
57