1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_EXTABLE_H
3#define __ASM_EXTABLE_H
4
5#include <linux/stringify.h>
6#include <linux/bits.h>
7#include <asm/asm-const.h>
8
9#define EX_TYPE_NONE		0
10#define EX_TYPE_FIXUP		1
11#define EX_TYPE_BPF		2
12#define EX_TYPE_UA_STORE	3
13#define EX_TYPE_UA_LOAD_MEM	4
14#define EX_TYPE_UA_LOAD_REG	5
15#define EX_TYPE_UA_LOAD_REGPAIR	6
16
17#define EX_DATA_REG_ERR_SHIFT	0
18#define EX_DATA_REG_ERR		GENMASK(3, 0)
19
20#define EX_DATA_REG_ADDR_SHIFT	4
21#define EX_DATA_REG_ADDR	GENMASK(7, 4)
22
23#define EX_DATA_LEN_SHIFT	8
24#define EX_DATA_LEN		GENMASK(11, 8)
25
26#define __EX_TABLE(_section, _fault, _target, _type)			\
27	stringify_in_c(.section	_section,"a";)				\
28	stringify_in_c(.balign	4;)					\
29	stringify_in_c(.long	(_fault) - .;)				\
30	stringify_in_c(.long	(_target) - .;)				\
31	stringify_in_c(.short	(_type);)				\
32	stringify_in_c(.short	0;)					\
33	stringify_in_c(.previous)
34
35#define __EX_TABLE_UA(_section, _fault, _target, _type, _regerr, _regaddr, _len)\
36	stringify_in_c(.section _section,"a";)					\
37	stringify_in_c(.balign	4;)						\
38	stringify_in_c(.long	(_fault) - .;)					\
39	stringify_in_c(.long	(_target) - .;)					\
40	stringify_in_c(.short	(_type);)					\
41	stringify_in_c(.macro	extable_reg regerr, regaddr;)			\
42	stringify_in_c(.set	.Lfound, 0;)					\
43	stringify_in_c(.set	.Lcurr, 0;)					\
44	stringify_in_c(.irp	rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;)	\
45	stringify_in_c(		.ifc	"\regerr", "%%r\rs";)			\
46	stringify_in_c(			.set	.Lfound, 1;)			\
47	stringify_in_c(			.set	.Lregerr, .Lcurr;)		\
48	stringify_in_c(		.endif;)					\
49	stringify_in_c(		.set	.Lcurr, .Lcurr+1;)			\
50	stringify_in_c(.endr;)							\
51	stringify_in_c(.ifne	(.Lfound != 1);)				\
52	stringify_in_c(		.error	"extable_reg: bad register argument1";)	\
53	stringify_in_c(.endif;)							\
54	stringify_in_c(.set	.Lfound, 0;)					\
55	stringify_in_c(.set	.Lcurr, 0;)					\
56	stringify_in_c(.irp	rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;)	\
57	stringify_in_c(		.ifc	"\regaddr", "%%r\rs";)			\
58	stringify_in_c(			.set	.Lfound, 1;)			\
59	stringify_in_c(			.set	.Lregaddr, .Lcurr;)		\
60	stringify_in_c(		.endif;)					\
61	stringify_in_c(		.set	.Lcurr, .Lcurr+1;)			\
62	stringify_in_c(.endr;)							\
63	stringify_in_c(.ifne	(.Lfound != 1);)				\
64	stringify_in_c(		.error	"extable_reg: bad register argument2";)	\
65	stringify_in_c(.endif;)							\
66	stringify_in_c(.short	.Lregerr << EX_DATA_REG_ERR_SHIFT |		\
67				.Lregaddr << EX_DATA_REG_ADDR_SHIFT |		\
68				_len << EX_DATA_LEN_SHIFT;)			\
69	stringify_in_c(.endm;)							\
70	stringify_in_c(extable_reg _regerr,_regaddr;)				\
71	stringify_in_c(.purgem	extable_reg;)					\
72	stringify_in_c(.previous)
73
74#define EX_TABLE(_fault, _target)					\
75	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP)
76
77#define EX_TABLE_AMODE31(_fault, _target)				\
78	__EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP)
79
80#define EX_TABLE_UA_STORE(_fault, _target, _regerr)			\
81	__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_STORE, _regerr, _regerr, 0)
82
83#define EX_TABLE_UA_LOAD_MEM(_fault, _target, _regerr, _regmem, _len)	\
84	__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_MEM, _regerr, _regmem, _len)
85
86#define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero)	\
87	__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
88
89#define EX_TABLE_UA_LOAD_REGPAIR(_fault, _target, _regerr, _regzero)	\
90	__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REGPAIR, _regerr, _regzero, 0)
91
92#endif /* __ASM_EXTABLE_H */
93