LXR linux/arch/x86/include/asm/extable.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_EXTABLE_H
   3#define _ASM_X86_EXTABLE_H
   4/*
   5 * The exception table consists of triples of addresses relative to the
   6 * exception table entry itself. The first address is of an instruction
   7 * that is allowed to fault, the second is the target at which the program
   8 * should continue. The third is a handler function to deal with the fault
   9 * caused by the instruction in the first field.
  10 *
  11 * All the routines below use bits of fixup code that are out of line
  12 * with the main instruction path.  This means when everything is well,
  13 * we don't even have to jump over them.  Further, they do not intrude
  14 * on our cache or tlb entries.
  15 */
  16
  17struct exception_table_entry {
  18        int insn, fixup, handler;
  19};
  20struct pt_regs;
  21
  22#define ARCH_HAS_RELATIVE_EXTABLE
  23
  24#define swap_ex_entry_fixup(a, b, tmp, delta)                   \
  25        do {                                                    \
  26                (a)->fixup = (b)->fixup + (delta);              \
  27                (b)->fixup = (tmp).fixup - (delta);             \
  28                (a)->handler = (b)->handler + (delta);          \
  29                (b)->handler = (tmp).handler - (delta);         \
  30        } while (0)
  31
  32extern int fixup_exception(struct pt_regs *regs, int trapnr,
  33                           unsigned long error_code, unsigned long fault_addr);
  34extern int fixup_bug(struct pt_regs *regs, int trapnr);
  35extern bool ex_has_fault_handler(unsigned long ip);
  36extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
  37
  38#endif
  39