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/sched.h>
11#include <linux/sched/task_stack.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12
13#ifdef CONFIG_LIVEPATCH_64
14static inline void klp_init_thread_info(struct task_struct *p)
15{
16	/* + 1 to account for STACK_END_MAGIC */
17	task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1;
18}
19#else
20static inline void klp_init_thread_info(struct task_struct *p) { }
21#endif
22
23#endif /* _ASM_POWERPC_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 int klp_write_module_reloc(struct module *mod, unsigned long
32		type, unsigned long loc, unsigned long value)
33{
34	/* This requires infrastructure changes; we need the loadinfos. */
35	return -ENOSYS;
36}
37
38static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
39{
40	regs->nip = ip;
41}
42
43#define klp_get_ftrace_location klp_get_ftrace_location
44static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
45{
46	/*
47	 * Live patch works only with -mprofile-kernel on PPC. In this case,
48	 * the ftrace location is always within the first 16 bytes.
49	 */
50	return ftrace_location_range(faddr, faddr + 16);
51}
52
53static inline void klp_init_thread_info(struct thread_info *ti)
 
54{
55	/* + 1 to account for STACK_END_MAGIC */
56	ti->livepatch_sp = (unsigned long *)(ti + 1) + 1;
57}
58#else
59static void klp_init_thread_info(struct thread_info *ti) { }
60#endif /* CONFIG_LIVEPATCH */
61
62#endif /* _ASM_POWERPC_LIVEPATCH_H */