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

   1/*
   2 * livepatch.h - powerpc-specific Kernel Live Patching Core
   3 *
   4 * Copyright (C) 2015-2016, SUSE, IBM Corp.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19#ifndef _ASM_POWERPC_LIVEPATCH_H
  20#define _ASM_POWERPC_LIVEPATCH_H
  21
  22#include <linux/module.h>
  23#include <linux/ftrace.h>
  24
  25#ifdef CONFIG_LIVEPATCH
  26static inline int klp_check_compiler_support(void)
  27{
  28        return 0;
  29}
  30
  31static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
  32{
  33        regs->nip = ip;
  34}
  35
  36#define klp_get_ftrace_location klp_get_ftrace_location
  37static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
  38{
  39        /*
  40         * Live patch works only with -mprofile-kernel on PPC. In this case,
  41         * the ftrace location is always within the first 16 bytes.
  42         */
  43        return ftrace_location_range(faddr, faddr + 16);
  44}
  45
  46static inline void klp_init_thread_info(struct thread_info *ti)
  47{
  48        /* + 1 to account for STACK_END_MAGIC */
  49        ti->livepatch_sp = (unsigned long *)(ti + 1) + 1;
  50}
  51#else
  52static void klp_init_thread_info(struct thread_info *ti) { }
  53#endif /* CONFIG_LIVEPATCH */
  54
  55#endif /* _ASM_POWERPC_LIVEPATCH_H */
  56