Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
9enum jump_label_type {
10 JUMP_LABEL_ENABLE,
11 JUMP_LABEL_DISABLE
12};
13
14struct module;
15
16#ifdef HAVE_JUMP_LABEL
17
18extern struct jump_entry __start___jump_table[];
19extern struct jump_entry __stop___jump_table[];
20
21extern void jump_label_lock(void);
22extern void jump_label_unlock(void);
23extern void arch_jump_label_transform(struct jump_entry *entry,
24 enum jump_label_type type);
25extern void arch_jump_label_text_poke_early(jump_label_t addr);
26extern void jump_label_update(unsigned long key, enum jump_label_type type);
27extern void jump_label_apply_nops(struct module *mod);
28extern 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) \
39do { \
40 if (unlikely(*key)) \
41 goto label; \
42} while (0)
43
44#define jump_label_enable(cond_var) \
45do { \
46 *(cond_var) = 1; \
47} while (0)
48
49#define jump_label_disable(cond_var) \
50do { \
51 *(cond_var) = 0; \
52} while (0)
53
54static inline int jump_label_apply_nops(struct module *mod)
55{
56 return 0;
57}
58
59static inline int jump_label_text_reserved(void *start, void *end)
60{
61 return 0;
62}
63
64static inline void jump_label_lock(void) {}
65static inline void jump_label_unlock(void) {}
66
67#endif
68
69#define COND_STMT(key, stmt) \
70do { \
71 __label__ jl_enabled; \
72 JUMP_LABEL(key, jl_enabled); \
73 if (0) { \
74jl_enabled: \
75 stmt; \
76 } \
77} while (0)
78
79#endif