1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef __ASM_EXTABLE_H
3 #define __ASM_EXTABLE_H
4
5 /*
6 * The exception table consists of pairs of re
7 * is the relative offset to an instruction th
8 * and the second is the relative offset at wh
9 * continue. No registers are modified, so it
10 * continuation code to figure out what to do.
11 *
12 * All the routines below use bits of fixup co
13 * with the main instruction path. This means
14 * we don't even have to jump over them. Furt
15 * on our cache or tlb entries.
16 */
17
18 struct exception_table_entry
19 {
20 int insn, fixup;
21 short type, data;
22 };
23
24 #define ARCH_HAS_RELATIVE_EXTABLE
25
26 #define swap_ex_entry_fixup(a, b, tmp, delta)
27 do {
28 (a)->fixup = (b)->fixup + (delta);
29 (b)->fixup = (tmp).fixup - (delta);
30 (a)->type = (b)->type;
31 (b)->type = (tmp).type;
32 (a)->data = (b)->data;
33 (b)->data = (tmp).data;
34 } while (0)
35
36 #ifdef CONFIG_BPF_JIT
37 bool ex_handler_bpf(const struct exception_tab
38 struct pt_regs *regs);
39 #else /* !CONFIG_BPF_JIT */
40 static inline
41 bool ex_handler_bpf(const struct exception_tab
42 struct pt_regs *regs)
43 {
44 return false;
45 }
46 #endif /* !CONFIG_BPF_JIT */
47
48 bool fixup_exception(struct pt_regs *regs);
49 #endif
50
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