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
19 static __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;
37 label:
38 return true;
39 }
40
41 static __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;
59 label:
60 return true;
61 }
62
63 #endif /* __ASSEMBLY__ */
64 #endif /* __ASM_JUMP_LABEL_H */
65
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