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#define EX_TYPE_LOAD_UNALIGNED_ZEROPAD	4
10
11#ifdef CONFIG_MMU
12
13#ifdef __ASSEMBLY__
14
15#define __ASM_EXTABLE_RAW(insn, fixup, type, data)	\
16	.pushsection	__ex_table, "a";		\
17	.balign		4;				\
18	.long		((insn) - .);			\
19	.long		((fixup) - .);			\
20	.short		(type);				\
21	.short		(data);				\
22	.popsection;
23
24	.macro		_asm_extable, insn, fixup
25	__ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
26	.endm
27
28#else /* __ASSEMBLY__ */
29
30#include <linux/bits.h>
31#include <linux/stringify.h>
32#include <asm/gpr-num.h>
33
34#define __ASM_EXTABLE_RAW(insn, fixup, type, data)	\
35	".pushsection	__ex_table, \"a\"\n"		\
36	".balign	4\n"				\
37	".long		((" insn ") - .)\n"		\
38	".long		((" fixup ") - .)\n"		\
39	".short		(" type ")\n"			\
40	".short		(" data ")\n"			\
41	".popsection\n"
42
43#define _ASM_EXTABLE(insn, fixup)	\
44	__ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0")
45
46#define EX_DATA_REG_ERR_SHIFT	0
47#define EX_DATA_REG_ERR		GENMASK(4, 0)
48#define EX_DATA_REG_ZERO_SHIFT	5
49#define EX_DATA_REG_ZERO	GENMASK(9, 5)
50
51#define EX_DATA_REG_DATA_SHIFT	0
52#define EX_DATA_REG_DATA	GENMASK(4, 0)
53#define EX_DATA_REG_ADDR_SHIFT	5
54#define EX_DATA_REG_ADDR	GENMASK(9, 5)
55
56#define EX_DATA_REG(reg, gpr)						\
57	"((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
58
59#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)		\
60	__DEFINE_ASM_GPR_NUMS						\
61	__ASM_EXTABLE_RAW(#insn, #fixup, 				\
62			  __stringify(EX_TYPE_UACCESS_ERR_ZERO),	\
63			  "("						\
64			    EX_DATA_REG(ERR, err) " | "			\
65			    EX_DATA_REG(ZERO, zero)			\
66			  ")")
67
68#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)			\
69	_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
70
71#define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr)		\
72	__DEFINE_ASM_GPR_NUMS							\
73	__ASM_EXTABLE_RAW(#insn, #fixup,					\
74			  __stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD),		\
75			  "("							\
76			    EX_DATA_REG(DATA, data) " | "			\
77			    EX_DATA_REG(ADDR, addr)				\
78			  ")")
79
80#endif /* __ASSEMBLY__ */
81
82#else /* CONFIG_MMU */
83	#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)
84#endif /* CONFIG_MMU */
85
86#endif /* __ASM_ASM_EXTABLE_H */
87