tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef _ASM_ARM_JUMP_LABEL_H
2#define _ASM_ARM_JUMP_LABEL_H
3
4#ifdef __KERNEL__
5
6#include <linux/types.h>
7#include <asm/system.h>
8
9#define JUMP_LABEL_NOP_SIZE 4
10
11#ifdef CONFIG_THUMB2_KERNEL
12#define JUMP_LABEL_NOP "nop.w"
13#else
14#define JUMP_LABEL_NOP "nop"
15#endif
16
17static __always_inline bool arch_static_branch(struct static_key *key)
18{
19 asm goto("1:\n\t"
20 JUMP_LABEL_NOP "\n\t"
21 ".pushsection __jump_table, \"aw\"\n\t"
22 ".word 1b, %l[l_yes], %c0\n\t"
23 ".popsection\n\t"
24 : : "i" (key) : : l_yes);
25
26 return false;
27l_yes:
28 return true;
29}
30
31#endif /* __KERNEL__ */
32
33typedef u32 jump_label_t;
34
35struct jump_entry {
36 jump_label_t code;
37 jump_label_t target;
38 jump_label_t key;
39};
40
41#endif