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