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1 | #ifndef _LINUX_JUMP_LABEL_H |
2 | #define _LINUX_JUMP_LABEL_H |
3 | |
4 | #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) |
5 | # include <asm/jump_label.h> |
6 | # define HAVE_JUMP_LABEL |
7 | #endif |
8 | |
9 | enum jump_label_type { |
10 | JUMP_LABEL_ENABLE, |
11 | JUMP_LABEL_DISABLE |
12 | }; |
13 | |
14 | struct module; |
15 | |
16 | #ifdef HAVE_JUMP_LABEL |
17 | |
18 | extern struct jump_entry __start___jump_table[]; |
19 | extern struct jump_entry __stop___jump_table[]; |
20 | |
21 | extern void jump_label_lock(void); |
22 | extern void jump_label_unlock(void); |
23 | extern void arch_jump_label_transform(struct jump_entry *entry, |
24 | enum jump_label_type type); |
25 | extern void arch_jump_label_text_poke_early(jump_label_t addr); |
26 | extern void jump_label_update(unsigned long key, enum jump_label_type type); |
27 | extern void jump_label_apply_nops(struct module *mod); |
28 | extern int jump_label_text_reserved(void *start, void *end); |
29 | |
30 | #define jump_label_enable(key) \ |
31 | jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE); |
32 | |
33 | #define jump_label_disable(key) \ |
34 | jump_label_update((unsigned long)key, JUMP_LABEL_DISABLE); |
35 | |
36 | #else |
37 | |
38 | #define JUMP_LABEL(key, label) \ |
39 | do { \ |
40 | if (unlikely(*key)) \ |
41 | goto label; \ |
42 | } while (0) |
43 | |
44 | #define jump_label_enable(cond_var) \ |
45 | do { \ |
46 | *(cond_var) = 1; \ |
47 | } while (0) |
48 | |
49 | #define jump_label_disable(cond_var) \ |
50 | do { \ |
51 | *(cond_var) = 0; \ |
52 | } while (0) |
53 | |
54 | static inline int jump_label_apply_nops(struct module *mod) |
55 | { |
56 | return 0; |
57 | } |
58 | |
59 | static inline int jump_label_text_reserved(void *start, void *end) |
60 | { |
61 | return 0; |
62 | } |
63 | |
64 | static inline void jump_label_lock(void) {} |
65 | static inline void jump_label_unlock(void) {} |
66 | |
67 | #endif |
68 | |
69 | #define COND_STMT(key, stmt) \ |
70 | do { \ |
71 | __label__ jl_enabled; \ |
72 | JUMP_LABEL(key, jl_enabled); \ |
73 | if (0) { \ |
74 | jl_enabled: \ |
75 | stmt; \ |
76 | } \ |
77 | } while (0) |
78 | |
79 | #endif |
80 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9