tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2020 Emil Renner Berthing
4 *
5 * Based on arch/arm64/include/asm/jump_label.h
6 */
7#ifndef __ASM_JUMP_LABEL_H
8#define __ASM_JUMP_LABEL_H
9
10#ifndef __ASSEMBLY__
11
12#include <linux/types.h>
13#include <asm/asm.h>
14
15#define HAVE_JUMP_LABEL_BATCH
16
17#define JUMP_LABEL_NOP_SIZE 4
18
19static __always_inline bool arch_static_branch(struct static_key * const key,
20 const bool branch)
21{
22 asm goto(
23 " .align 2 \n\t"
24 " .option push \n\t"
25 " .option norelax \n\t"
26 " .option norvc \n\t"
27 "1: nop \n\t"
28 " .option pop \n\t"
29 " .pushsection __jump_table, \"aw\" \n\t"
30 " .align " RISCV_LGPTR " \n\t"
31 " .long 1b - ., %l[label] - . \n\t"
32 " " RISCV_PTR " %0 - . \n\t"
33 " .popsection \n\t"
34 : : "i"(&((char *)key)[branch]) : : label);
35
36 return false;
37label:
38 return true;
39}
40
41static __always_inline bool arch_static_branch_jump(struct static_key * const key,
42 const bool branch)
43{
44 asm goto(
45 " .align 2 \n\t"
46 " .option push \n\t"
47 " .option norelax \n\t"
48 " .option norvc \n\t"
49 "1: j %l[label] \n\t"
50 " .option pop \n\t"
51 " .pushsection __jump_table, \"aw\" \n\t"
52 " .align " RISCV_LGPTR " \n\t"
53 " .long 1b - ., %l[label] - . \n\t"
54 " " RISCV_PTR " %0 - . \n\t"
55 " .popsection \n\t"
56 : : "i"(&((char *)key)[branch]) : : label);
57
58 return false;
59label:
60 return true;
61}
62
63#endif /* __ASSEMBLY__ */
64#endif /* __ASM_JUMP_LABEL_H */