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