Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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_BPF 2
8#define EX_TYPE_UACCESS_ERR_ZERO 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), "0")
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 */