1 # SPDX-License-Identifier: GPL-2.0
2 
3 # List of files in the vdso, has to be asm only for now
4 
5 ARCH_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
6 include $(srctree)/lib/vdso/Makefile
7 
8 obj-vdso32 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o
9 
10 ifneq ($(c-gettimeofday-y),)
11   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
12   CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
13   CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
14   CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
15   CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
16   CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
17 endif
18 
19 # Build rules
20 
21 ifdef CROSS32_COMPILE
22     VDSOCC := $(CROSS32_COMPILE)gcc
23 else
24     VDSOCC := $(CC)
25 endif
26 
27 CC32FLAGS :=
28 ifdef CONFIG_PPC64
29 CC32FLAGS += -m32
30 KBUILD_CFLAGS := $(filter-out -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc,$(KBUILD_CFLAGS))
31 endif
32 
33 targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday.o
34 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
35 
36 GCOV_PROFILE := n
37 KCOV_INSTRUMENT := n
38 UBSAN_SANITIZE := n
39 KASAN_SANITIZE := n
40 
41 ccflags-y := -shared -fno-common -fno-builtin -nostdlib \
42 	-Wl,-soname=linux-vdso32.so.1 -Wl,--hash-style=both
43 asflags-y := -D__VDSO32__ -s
44 
45 obj-y += vdso32_wrapper.o
46 targets += vdso32.lds
47 CPPFLAGS_vdso32.lds += -P -C -Upowerpc
48 
49 # link rule for the .so file, .lds has to be first
50 $(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday.o FORCE
51 	$(call if_changed,vdso32ld_and_check)
52 
53 # assembly rules for the .S files
54 $(obj-vdso32): %.o: %.S FORCE
55 	$(call if_changed_dep,vdso32as)
56 $(obj)/vgettimeofday.o: %.o: %.c FORCE
57 	$(call if_changed_dep,vdso32cc)
58 
59 # Generate VDSO offsets using helper script
60 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
61 quiet_cmd_vdsosym = VDSOSYM $@
62       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
63 
64 include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
65 	$(call if_changed,vdsosym)
66 
67 # actual build commands
68 quiet_cmd_vdso32ld_and_check = VDSO32L $@
69       cmd_vdso32ld_and_check = $(VDSOCC) $(c_flags) $(CC32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) ; $(cmd_vdso_check)
70 quiet_cmd_vdso32as = VDSO32A $@
71       cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) -c -o $@ $<
72 quiet_cmd_vdso32cc = VDSO32C $@
73       cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $<
74