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

   1/*
   2 * livepatch.h - x86-specific Kernel Live Patching Core
   3 *
   4 * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
   5 * Copyright (C) 2014 SUSE
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * as published by the Free Software Foundation; either version 2
  10 * of the License, or (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21#ifndef _ASM_X86_LIVEPATCH_H
  22#define _ASM_X86_LIVEPATCH_H
  23
  24#include <asm/setup.h>
  25#include <linux/module.h>
  26#include <linux/ftrace.h>
  27
  28#ifdef CONFIG_LIVEPATCH
  29static inline int klp_check_compiler_support(void)
  30{
  31#ifndef CC_USING_FENTRY
  32        return 1;
  33#endif
  34        return 0;
  35}
  36int klp_write_module_reloc(struct module *mod, unsigned long type,
  37                           unsigned long loc, unsigned long value);
  38
  39static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
  40{
  41        regs->ip = ip;
  42}
  43#else
  44#error Live patching support is disabled; check CONFIG_LIVEPATCH
  45#endif
  46
  47#endif /* _ASM_X86_LIVEPATCH_H */
  48