Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#include <linux/sched/task_stack.h>
25
26#ifdef CONFIG_LIVEPATCH
27static inline int klp_check_compiler_support(void)
28{
29 return 0;
30}
31
32static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
33{
34 regs->nip = ip;
35}
36
37#define klp_get_ftrace_location klp_get_ftrace_location
38static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
39{
40 /*
41 * Live patch works only with -mprofile-kernel on PPC. In this case,
42 * the ftrace location is always within the first 16 bytes.
43 */
44 return ftrace_location_range(faddr, faddr + 16);
45}
46
47static inline void klp_init_thread_info(struct task_struct *p)
48{
49 /* + 1 to account for STACK_END_MAGIC */
50 task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1;
51}
52#else
53static inline void klp_init_thread_info(struct task_struct *p) { }
54#endif /* CONFIG_LIVEPATCH */
55
56#endif /* _ASM_POWERPC_LIVEPATCH_H */