1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_EXTABLE_H
3#define __ASM_EXTABLE_H
4
5/*
6 * The exception table consists of pairs of relative offsets: the first
7 * is the relative offset to an instruction that is allowed to fault,
8 * and the second is the relative offset at which the program should
9 * continue. No registers are modified, so it is entirely up to the
10 * continuation code to figure out what to do.
11 *
12 * All the routines below use bits of fixup code that are out of line
13 * with the main instruction path.  This means when everything is well,
14 * we don't even have to jump over them.  Further, they do not intrude
15 * on our cache or tlb entries.
16 */
17
18struct exception_table_entry
19{
20	int insn, fixup;
21};
22
23#define ARCH_HAS_RELATIVE_EXTABLE
24
25static inline bool in_bpf_jit(struct pt_regs *regs)
26{
27	if (!IS_ENABLED(CONFIG_BPF_JIT))
28		return false;
29
30	return regs->pc >= BPF_JIT_REGION_START &&
31	       regs->pc < BPF_JIT_REGION_END;
32}
33
34#ifdef CONFIG_BPF_JIT
35int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
36			      struct pt_regs *regs);
37#else /* !CONFIG_BPF_JIT */
38static inline
39int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
40			      struct pt_regs *regs)
41{
42	return 0;
43}
44#endif /* !CONFIG_BPF_JIT */
45
46extern int fixup_exception(struct pt_regs *regs);
47#endif
48