1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # Makefile for compat_vdso
4 #
5
6 # Symbols present in the compat_vdso
7 compat_vdso-syms = rt_sigreturn
8 compat_vdso-syms += getcpu
9 compat_vdso-syms += flush_icache
10
11 COMPAT_CC := $(CC)
12 COMPAT_LD := $(LD)
13
14 # binutils 2.35 does not support the zifencei
15 # spec 20191213, G stands for IMAFD_ZICSR_ZIFE
16 ifdef CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZI
17 COMPAT_CC_FLAGS := -march=rv32g -mabi=
18 else
19 COMPAT_CC_FLAGS := -march=rv32imafd -m
20 endif
21 COMPAT_LD_FLAGS := -melf32lriscv
22
23 # Disable attributes, as they're useless and b
24 COMPAT_CC_FLAGS += $(call cc-option,-mno-riscv
25 COMPAT_CC_FLAGS += $(call as-option,-Wa$(comma
26
27 # Files to link into the compat_vdso
28 obj-compat_vdso = $(patsubst %, %.o, $(compat_
29
30 # Build rules
31 targets := $(obj-compat_vdso) compat_vdso.so c
32 obj-compat_vdso := $(addprefix $(obj)/, $(obj-
33
34 obj-y += compat_vdso.o
35 CPPFLAGS_compat_vdso.lds += -P -C -DCOMPAT_VDS
36
37 # Force dependency
38 $(obj)/compat_vdso.o: $(obj)/compat_vdso.so
39
40 # link rule for the .so file, .lds has to be f
41 $(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.
42 $(call if_changed,compat_vdsold)
43 LDFLAGS_compat_vdso.so.dbg = -shared -S -sonam
44 --build-id=sha1 --hash-style=both --eh
45
46 $(obj-compat_vdso): %.o: %.S FORCE
47 $(call if_changed_dep,compat_vdsoas)
48
49 # strip rule for the .so file
50 $(obj)/%.so: OBJCOPYFLAGS := -S
51 $(obj)/%.so: $(obj)/%.so.dbg FORCE
52 $(call if_changed,objcopy)
53
54 # Generate VDSO offsets using helper script
55 gen-compat_vdsosym := $(src)/gen_compat_vdso_o
56 quiet_cmd_compat_vdsosym = VDSOSYM $@
57 cmd_compat_vdsosym = $(NM) $< | $(gen-
58
59 include/generated/compat_vdso-offsets.h: $(obj
60 $(call if_changed,compat_vdsosym)
61
62 # actual build commands
63 # The DSO images are built using a special lin
64 # Make sure only to export the intended __comp
65 quiet_cmd_compat_vdsold = VDSOLD $@
66 cmd_compat_vdsold = $(COMPAT_LD) $(ld_fl
67 $(OBJCOPY) $(patsubst %, -G
68 rm $@.tmp
69
70 # actual build commands
71 quiet_cmd_compat_vdsoas = VDSOAS $@
72 cmd_compat_vdsoas = $(COMPAT_CC) $(a_fla
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