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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 */