arch/powerpc/include/asm/extable.h

   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
  19 struct exception_table_entry {
  20         int insn;
  21         int fixup;
  22 };
  23
  24 static inline unsigned long extable_fixup(const struct exception_table_entry *x)
  25 {
  26         return (unsigned long)&x->fixup + x->fixup;
  27 }
  28
  29 #endif