Linux kernel mirror (for testing)
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linux
1#ifndef _ARCH_POWERPC_EXTABLE_H
2#define _ARCH_POWERPC_EXTABLE_H
3
4/*
5 * The exception table consists of pairs of relative addresses: the first is
6 * the 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 what
9 * to do.
10 *
11 * All the routines below use bits of fixup code that are out of line with the
12 * main instruction path. This means when everything is well, we don't even
13 * have to jump over them. Further, they do not intrude on our cache or tlb
14 * entries.
15 */
16
17#define ARCH_HAS_RELATIVE_EXTABLE
18
19struct exception_table_entry {
20 int insn;
21 int fixup;
22};
23
24static inline unsigned long extable_fixup(const struct exception_table_entry *x)
25{
26 return (unsigned long)&x->fixup + x->fixup;
27}
28
29#endif