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
  29 static inline int klp_check_compiler_support(void)
  30 {
  31 #ifndef CC_USING_FENTRY
  32         return 1;
  33 #endif
  34         return 0;
  35 }
  36 int klp_write_module_reloc(struct module *mod, unsigned long type,
  37                            unsigned long loc, unsigned long value);
  38
  39 static 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 */