arch/powerpc/include/asm/extable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ARCH_POWERPC_EXTABLE_H
   3 #define _ARCH_POWERPC_EXTABLE_H
   4
   5 /*
   6  * The exception table consists of pairs of relative addresses: the first is
   7  * the address of an instruction that is allowed to fault, and the second is
   8  * the address at which the program should continue.  No registers are
   9  * modified, so it is entirely up to the continuation code to figure out what
  10  * to do.
  11  *
  12  * All the routines below use bits of fixup code that are out of line with the
  13  * main instruction path.  This means when everything is well, we don't even
  14  * have to jump over them.  Further, they do not intrude on our cache or tlb
  15  * entries.
  16  */
  17
  18 #define ARCH_HAS_RELATIVE_EXTABLE
  19
  20 struct exception_table_entry {
  21         int insn;
  22         int fixup;
  23 };
  24
  25 static inline unsigned long extable_fixup(const struct exception_table_entry *x)
  26 {
  27         return (unsigned long)&x->fixup + x->fixup;
  28 }
  29
  30 #endif