linux_kernel/arch/s390/include/asm/extable.h

#ifndef __S390_EXTABLE_H
#define __S390_EXTABLE_H
/*
 * The exception table consists of pairs of 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.
 */

struct exception_table_entry
{
	int insn, fixup;
};

static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
	return (unsigned long)&x->fixup + x->fixup;
}

#define ARCH_HAS_RELATIVE_EXTABLE

#endif