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ac5f89c7 ME |
1 | #ifndef _ASM_POWERPC_JUMP_LABEL_H |
2 | #define _ASM_POWERPC_JUMP_LABEL_H | |
3 | ||
4 | /* | |
5 | * Copyright 2010 Michael Ellerman, IBM Corp. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
cc1adb5f | 13 | #ifndef __ASSEMBLY__ |
ac5f89c7 ME |
14 | #include <linux/types.h> |
15 | ||
16 | #include <asm/feature-fixups.h> | |
17 | ||
18 | #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) | |
19 | #define JUMP_LABEL_NOP_SIZE 4 | |
20 | ||
11276d53 | 21 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
ac5f89c7 | 22 | { |
3f0116c3 | 23 | asm_volatile_goto("1:\n\t" |
ac5f89c7 ME |
24 | "nop\n\t" |
25 | ".pushsection __jump_table, \"aw\"\n\t" | |
ac5f89c7 ME |
26 | JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" |
27 | ".popsection \n\t" | |
11276d53 PZ |
28 | : : "i" (&((char *)key)[branch]) : : l_yes); |
29 | ||
30 | return false; | |
31 | l_yes: | |
32 | return true; | |
33 | } | |
34 | ||
35 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) | |
36 | { | |
37 | asm_volatile_goto("1:\n\t" | |
38 | "b %l[l_yes]\n\t" | |
39 | ".pushsection __jump_table, \"aw\"\n\t" | |
40 | JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" | |
41 | ".popsection \n\t" | |
42 | : : "i" (&((char *)key)[branch]) : : l_yes); | |
43 | ||
ac5f89c7 ME |
44 | return false; |
45 | l_yes: | |
46 | return true; | |
47 | } | |
48 | ||
49 | #ifdef CONFIG_PPC64 | |
50 | typedef u64 jump_label_t; | |
51 | #else | |
52 | typedef u32 jump_label_t; | |
53 | #endif | |
54 | ||
55 | struct jump_entry { | |
56 | jump_label_t code; | |
57 | jump_label_t target; | |
58 | jump_label_t key; | |
ac5f89c7 ME |
59 | }; |
60 | ||
cc1adb5f AB |
61 | #else |
62 | #define ARCH_STATIC_BRANCH(LABEL, KEY) \ | |
63 | 1098: nop; \ | |
64 | .pushsection __jump_table, "aw"; \ | |
65 | FTR_ENTRY_LONG 1098b, LABEL, KEY; \ | |
66 | .popsection | |
67 | #endif | |
68 | ||
ac5f89c7 | 69 | #endif /* _ASM_POWERPC_JUMP_LABEL_H */ |