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 pt_regs *regs, unsigned long ip) 16{ 17 regs->nip = ip; 18} 19 20#define klp_get_ftrace_location klp_get_ftrace_location 21static inline unsigned long klp_get_ftrace_location(unsigned long faddr) 22{ 23 /* 24 * Live patch works only with -mprofile-kernel on PPC. In this case, 25 * the ftrace location is always within the first 16 bytes. 26 */ 27 return ftrace_location_range(faddr, faddr + 16); 28} 29 30static inline void klp_init_thread_info(struct task_struct *p) 31{ 32 /* + 1 to account for STACK_END_MAGIC */ 33 task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1; 34} 35#else 36static inline void klp_init_thread_info(struct task_struct *p) { } 37#endif /* CONFIG_LIVEPATCH */ 38 39#endif /* _ASM_POWERPC_LIVEPATCH_H */ 40