1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 * The exception table consists of pairs of addresses: the first is the
12 * address of an instruction that is allowed to fault, and the second is
13 * the address at which the program should continue. No registers are
14 * modified, so it is entirely up to the continuation code to figure out
17 * All the routines below use bits of fixup code that are out of line
18 * with the main instruction path. This means when everything is well,
19 * we don't even have to jump over them. Further, they do not intrude
20 * on our cache or tlb entries.
23 struct exception_table_entry
25 unsigned long insn, fixup;
28 extern const struct exception_table_entry __start___ex_table[];
29 extern const struct exception_table_entry __stop___ex_table[];
31 static inline unsigned long
32 search_one_table(const struct exception_table_entry *first,
33 const struct exception_table_entry *last,
37 while (first <= last) {
38 diff = first->insn - value;
48 search_exception_table(unsigned long addr)
52 /* There is only the kernel to search. */
53 ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
54 /* if the serial port does not hang in exception, printf can be used */
55 #if !defined(CONFIG_SYS_SERIAL_HANG_IN_EXCEPTION)
56 debug("Bus Fault @ 0x%08lx, fixup 0x%08lx\n", addr, ret);