1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __S390_EXTABLE_H
 3#define __S390_EXTABLE_H
 4
 5#include <asm/ptrace.h>
 6#include <linux/compiler.h>
 7
 8/*
 9 * The exception table consists of three addresses:
10 *
11 * - Address of an instruction that is allowed to fault.
12 * - Address at which the program should continue.
13 * - Optional address of handler that takes pt_regs * argument and runs in
14 *   interrupt context.
15 *
16 * No registers are modified, so it is entirely up to the continuation code
17 * to figure out what to do.
18 *
19 * All the routines below use bits of fixup code that are out of line
20 * with the main instruction path.  This means when everything is well,
21 * we don't even have to jump over them.  Further, they do not intrude
22 * on our cache or tlb entries.
23 */
24
25struct exception_table_entry
26{
27	int insn, fixup;
28	short type, data;
29};
30
31extern struct exception_table_entry *__start_amode31_ex_table;
32extern struct exception_table_entry *__stop_amode31_ex_table;
33
34const struct exception_table_entry *s390_search_extables(unsigned long addr);
35
36static inline unsigned long extable_fixup(const struct exception_table_entry *x)
37{
38	return (unsigned long)&x->fixup + x->fixup;
39}
40
41#define ARCH_HAS_RELATIVE_EXTABLE
42
43static inline void swap_ex_entry_fixup(struct exception_table_entry *a,
44				       struct exception_table_entry *b,
45				       struct exception_table_entry tmp,
46				       int delta)
47{
48	a->fixup = b->fixup + delta;
49	b->fixup = tmp.fixup - delta;
50	a->type = b->type;
51	b->type = tmp.type;
52	a->data = b->data;
53	b->data = tmp.data;
54}
55#define swap_ex_entry_fixup swap_ex_entry_fixup
56
57#ifdef CONFIG_BPF_JIT
58
59bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs);
60
61#else /* !CONFIG_BPF_JIT */
62
63static inline bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs)
64{
65	return false;
66}
67
68#endif /* CONFIG_BPF_JIT */
69
70bool fixup_exception(struct pt_regs *regs);
71
72#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __S390_EXTABLE_H
 3#define __S390_EXTABLE_H
 
 
 
 
 4/*
 5 * The exception table consists of pairs of addresses: the first is the
 6 * address of an instruction that is allowed to fault, and the second is
 7 * the address at which the program should continue.  No registers are
 8 * modified, so it is entirely up to the continuation code to figure out
 9 * what to do.
 
 
 
 
10 *
11 * All the routines below use bits of fixup code that are out of line
12 * with the main instruction path.  This means when everything is well,
13 * we don't even have to jump over them.  Further, they do not intrude
14 * on our cache or tlb entries.
15 */
16
17struct exception_table_entry
18{
19	int insn, fixup;
 
20};
21
 
 
 
 
 
22static inline unsigned long extable_fixup(const struct exception_table_entry *x)
23{
24	return (unsigned long)&x->fixup + x->fixup;
25}
26
27#define ARCH_HAS_RELATIVE_EXTABLE
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
28
29#endif