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Thomas Gleixner1ccea772019-05-19 15:51:43 +02001/* SPDX-License-Identifier: GPL-2.0-or-later */
Michael Ellermanf63e6d82016-03-24 22:04:03 +11002/*
3 * livepatch.h - powerpc-specific Kernel Live Patching Core
4 *
5 * Copyright (C) 2015-2016, SUSE, IBM Corp.
Michael Ellermanf63e6d82016-03-24 22:04:03 +11006 */
7#ifndef _ASM_POWERPC_LIVEPATCH_H
8#define _ASM_POWERPC_LIVEPATCH_H
9
10#include <linux/module.h>
11#include <linux/ftrace.h>
Christophe Leroyed1cd6d2019-01-31 10:08:58 +000012#include <linux/sched/task_stack.h>
Michael Ellermanf63e6d82016-03-24 22:04:03 +110013
14#ifdef CONFIG_LIVEPATCH
Michael Ellermanf63e6d82016-03-24 22:04:03 +110015static 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}
Michael Ellerman5d31a962016-03-24 22:04:04 +110029
Christophe Leroyed1cd6d2019-01-31 10:08:58 +000030static inline void klp_init_thread_info(struct task_struct *p)
Michael Ellerman5d31a962016-03-24 22:04:04 +110031{
32 /* + 1 to account for STACK_END_MAGIC */
Christophe Leroyed1cd6d2019-01-31 10:08:58 +000033 task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1;
Michael Ellerman5d31a962016-03-24 22:04:04 +110034}
35#else
Christophe Leroyed1cd6d2019-01-31 10:08:58 +000036static inline void klp_init_thread_info(struct task_struct *p) { }
Michael Ellermanf63e6d82016-03-24 22:04:03 +110037#endif /* CONFIG_LIVEPATCH */
38
39#endif /* _ASM_POWERPC_LIVEPATCH_H */