Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 CONFIG_MMU
11
12#ifdef __ASSEMBLY__
13
14#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
15 .pushsection __ex_table, "a"; \
16 .balign 4; \
17 .long ((insn) - .); \
18 .long ((fixup) - .); \
19 .short (type); \
20 .short (data); \
21 .popsection;
22
23 .macro _asm_extable, insn, fixup
24 __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
25 .endm
26
27#else /* __ASSEMBLY__ */
28
29#include <linux/bits.h>
30#include <linux/stringify.h>
31#include <asm/gpr-num.h>
32
33#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
34 ".pushsection __ex_table, \"a\"\n" \
35 ".balign 4\n" \
36 ".long ((" insn ") - .)\n" \
37 ".long ((" fixup ") - .)\n" \
38 ".short (" type ")\n" \
39 ".short (" data ")\n" \
40 ".popsection\n"
41
42#define _ASM_EXTABLE(insn, fixup) \
43 __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0")
44
45#define EX_DATA_REG_ERR_SHIFT 0
46#define EX_DATA_REG_ERR GENMASK(4, 0)
47#define EX_DATA_REG_ZERO_SHIFT 5
48#define EX_DATA_REG_ZERO GENMASK(9, 5)
49
50#define EX_DATA_REG(reg, gpr) \
51 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
52
53#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
54 __DEFINE_ASM_GPR_NUMS \
55 __ASM_EXTABLE_RAW(#insn, #fixup, \
56 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \
57 "(" \
58 EX_DATA_REG(ERR, err) " | " \
59 EX_DATA_REG(ZERO, zero) \
60 ")")
61
62#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
63 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
64
65#endif /* __ASSEMBLY__ */
66
67#else /* CONFIG_MMU */
68 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)
69#endif /* CONFIG_MMU */
70
71#endif /* __ASM_ASM_EXTABLE_H */