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d9f5ab7b JB |
1 | #ifndef _ASM_X86_JUMP_LABEL_H |
2 | #define _ASM_X86_JUMP_LABEL_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #include <linux/types.h> | |
7 | #include <asm/nops.h> | |
8 | ||
9 | #define JUMP_LABEL_NOP_SIZE 5 | |
10 | ||
11 | # define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" | |
12 | ||
13 | # define JUMP_LABEL(key, label) \ | |
14 | do { \ | |
15 | asm goto("1:" \ | |
16 | JUMP_LABEL_INITIAL_NOP \ | |
17 | ".pushsection __jump_table, \"a\" \n\t"\ | |
18 | _ASM_PTR "1b, %l[" #label "], %c0 \n\t" \ | |
19 | ".popsection \n\t" \ | |
20 | : : "i" (key) : : label); \ | |
21 | } while (0) | |
22 | ||
23 | #endif /* __KERNEL__ */ | |
24 | ||
25 | #ifdef CONFIG_X86_64 | |
26 | ||
27 | typedef u64 jump_label_t; | |
28 | ||
29 | struct jump_entry { | |
30 | jump_label_t code; | |
31 | jump_label_t target; | |
32 | jump_label_t key; | |
33 | }; | |
34 | ||
35 | #else | |
36 | ||
37 | typedef u32 jump_label_t; | |
38 | ||
39 | struct jump_entry { | |
40 | jump_label_t code; | |
41 | jump_label_t target; | |
42 | jump_label_t key; | |
43 | }; | |
44 | ||
45 | #endif | |
46 | ||
47 | #endif |