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f63e6d89 ME |
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 | |
26 | static inline int klp_check_compiler_support(void) | |
27 | { | |
28 | return 0; | |
29 | } | |
30 | ||
f63e6d89 ME |
31 | static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
32 | { | |
33 | regs->nip = ip; | |
34 | } | |
35 | ||
36 | #define klp_get_ftrace_location klp_get_ftrace_location | |
37 | static inline unsigned long klp_get_ftrace_location(unsigned long faddr) | |
38 | { | |
39 | /* | |
40 | * Live patch works only with -mprofile-kernel on PPC. In this case, | |
41 | * the ftrace location is always within the first 16 bytes. | |
42 | */ | |
43 | return ftrace_location_range(faddr, faddr + 16); | |
44 | } | |
5d31a96e ME |
45 | |
46 | static inline void klp_init_thread_info(struct thread_info *ti) | |
47 | { | |
48 | /* + 1 to account for STACK_END_MAGIC */ | |
49 | ti->livepatch_sp = (unsigned long *)(ti + 1) + 1; | |
50 | } | |
51 | #else | |
52 | static void klp_init_thread_info(struct thread_info *ti) { } | |
f63e6d89 ME |
53 | #endif /* CONFIG_LIVEPATCH */ |
54 | ||
55 | #endif /* _ASM_POWERPC_LIVEPATCH_H */ |