blob: 26ce2e5c0fa8e9b5c8d59028d153522bd07f0f36 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* The exception table consists of pairs of relative addresses: the first is
* the address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out what
* to do.
* All the routines below use bits of fixup code that are out of line with the
* main instruction path. This means when everything is well, we don't even
* have to jump over them. Further, they do not intrude on our cache or tlb
* entries.
#ifndef __ASSEMBLY__
struct exception_table_entry {
int insn;
int fixup;
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
return (unsigned long)&x->fixup + x->fixup;
* Helper macro for exception table entries
#define EX_TABLE(_fault, _target) \
stringify_in_c(.section __ex_table,"a";)\
stringify_in_c(.balign 4;) \
stringify_in_c(.long (_fault) - . ;) \
stringify_in_c(.long (_target) - . ;) \