arch/s390/include/asm/extable.h

   1 #ifndef __S390_EXTABLE_H
   2 #define __S390_EXTABLE_H
   3 /*
   4  * The exception table consists of pairs of addresses: the first is the
   5  * address of an instruction that is allowed to fault, and the second is
   6  * the address at which the program should continue.  No registers are
   7  * modified, so it is entirely up to the continuation code to figure out
   8  * what to do.
   9  *
  10  * All the routines below use bits of fixup code that are out of line
  11  * with the main instruction path.  This means when everything is well,
  12  * we don't even have to jump over them.  Further, they do not intrude
  13  * on our cache or tlb entries.
  14  */
  15
  16 struct exception_table_entry
  17 {
  18         int insn, fixup;
  19 };
  20
  21 static inline unsigned long extable_fixup(const struct exception_table_entry *x)
  22 {
  23         return (unsigned long)&x->fixup + x->fixup;
  24 }
  25
  26 #define ARCH_HAS_RELATIVE_EXTABLE
  27
  28 #endif