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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_ARM_JUMP_LABEL_H
3#define _ASM_ARM_JUMP_LABEL_H
4
5#ifndef __ASSEMBLY__
6
7#include <linux/types.h>
8#include <asm/unified.h>
9
10#define JUMP_LABEL_NOP_SIZE 4
11
12/* This macro is also expanded on the Rust side. */
13#define ARCH_STATIC_BRANCH_ASM(key, label) \
14 "1:\n\t" \
15 WASM(nop) "\n\t" \
16 ".pushsection __jump_table, \"aw\"\n\t" \
17 ".word 1b, " label ", " key "\n\t" \
18 ".popsection\n\t" \
19
20static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
21{
22 asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
23 : : "i" (&((char *)key)[branch]) : : l_yes);
24
25 return false;
26l_yes:
27 return true;
28}
29
30static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
31{
32 asm goto("1:\n\t"
33 WASM(b) " %l[l_yes]\n\t"
34 ".pushsection __jump_table, \"aw\"\n\t"
35 ".word 1b, %l[l_yes], %c0\n\t"
36 ".popsection\n\t"
37 : : "i" (&((char *)key)[branch]) : : l_yes);
38
39 return false;
40l_yes:
41 return true;
42}
43
44typedef u32 jump_label_t;
45
46struct jump_entry {
47 jump_label_t code;
48 jump_label_t target;
49 jump_label_t key;
50};
51
52#endif /* __ASSEMBLY__ */
53#endif