1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __ASM_ASM_EXTABLE_H
3 #define __ASM_ASM_EXTABLE_H
4
5 #define EX_TYPE_NONE 0
6 #define EX_TYPE_FIXUP 1
7 #define EX_TYPE_UACCESS_ERR_ZERO 2
8 #define EX_TYPE_BPF 3
9
10 #ifdef __ASSEMBLY__
11
12 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
13 .pushsection __ex_table, "a"; \
14 .balign 4; \
15 .long ((insn) - .); \
16 .long ((fixup) - .); \
17 .short (type); \
18 .short (data); \
19 .popsection;
20
21 .macro _asm_extable, insn, fixup
22 __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
23 .endm
24
25 #else /* __ASSEMBLY__ */
26
27 #include <linux/bits.h>
28 #include <linux/stringify.h>
29 #include <asm/gpr-num.h>
30
31 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
32 ".pushsection __ex_table, \"a\"\n" \
33 ".balign 4\n" \
34 ".long ((" insn ") - .)\n" \
35 ".long ((" fixup ") - .)\n" \
36 ".short (" type ")\n" \
37 ".short (" data ")\n" \
38 ".popsection\n"
39
40 #define _ASM_EXTABLE(insn, fixup) \
41 __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "")
42
43 #define EX_DATA_REG_ERR_SHIFT 0
44 #define EX_DATA_REG_ERR GENMASK(4, 0)
45 #define EX_DATA_REG_ZERO_SHIFT 5
46 #define EX_DATA_REG_ZERO GENMASK(9, 5)
47
48 #define EX_DATA_REG(reg, gpr) \
49 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
50
51 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
52 __DEFINE_ASM_GPR_NUMS \
53 __ASM_EXTABLE_RAW(#insn, #fixup, \
54 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \
55 "(" \
56 EX_DATA_REG(ERR, err) " | " \
57 EX_DATA_REG(ZERO, zero) \
58 ")")
59
60 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
61 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
62
63 #endif /* __ASSEMBLY__ */
64
65 #endif /* __ASM_ASM_EXTABLE_H */
66
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