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

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * livepatch.h - powerpc-specific Kernel Live Patching Core
   4 *
   5 * Copyright (C) 2015-2016, SUSE, IBM Corp.
   6 */
   7#ifndef _ASM_POWERPC_LIVEPATCH_H
   8#define _ASM_POWERPC_LIVEPATCH_H
   9
  10#include <linux/module.h>
  11#include <linux/ftrace.h>
  12#include <linux/sched/task_stack.h>
  13
  14#ifdef CONFIG_LIVEPATCH
  15static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
  16{
  17        struct pt_regs *regs = ftrace_get_regs(fregs);
  18
  19        regs_set_return_ip(regs, ip);
  20}
  21
  22#define klp_get_ftrace_location klp_get_ftrace_location
  23static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
  24{
  25        /*
  26         * Live patch works only with -mprofile-kernel on PPC. In this case,
  27         * the ftrace location is always within the first 16 bytes.
  28         */
  29        return ftrace_location_range(faddr, faddr + 16);
  30}
  31
  32static inline void klp_init_thread_info(struct task_struct *p)
  33{
  34        /* + 1 to account for STACK_END_MAGIC */
  35        task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1;
  36}
  37#else
  38static inline void klp_init_thread_info(struct task_struct *p) { }
  39#endif /* CONFIG_LIVEPATCH */
  40
  41#endif /* _ASM_POWERPC_LIVEPATCH_H */
  42