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94bb0c1a DD |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (c) 2010 Cavium Networks, Inc. | |
7 | */ | |
8 | #ifndef _ASM_MIPS_JUMP_LABEL_H | |
9 | #define _ASM_MIPS_JUMP_LABEL_H | |
10 | ||
55dd0df7 | 11 | #ifndef __ASSEMBLY__ |
94bb0c1a | 12 | |
55dd0df7 | 13 | #include <linux/types.h> |
94bb0c1a DD |
14 | |
15 | #define JUMP_LABEL_NOP_SIZE 4 | |
16 | ||
17 | #ifdef CONFIG_64BIT | |
18 | #define WORD_INSN ".dword" | |
19 | #else | |
20 | #define WORD_INSN ".word" | |
21 | #endif | |
22 | ||
935c2dbe MR |
23 | #ifdef CONFIG_CPU_MICROMIPS |
24 | #define NOP_INSN "nop32" | |
25 | #else | |
26 | #define NOP_INSN "nop" | |
27 | #endif | |
28 | ||
11276d53 | 29 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
d430d3d7 | 30 | { |
935c2dbe | 31 | asm_volatile_goto("1:\t" NOP_INSN "\n\t" |
d430d3d7 JB |
32 | "nop\n\t" |
33 | ".pushsection __jump_table, \"aw\"\n\t" | |
34 | WORD_INSN " 1b, %l[l_yes], %0\n\t" | |
35 | ".popsection\n\t" | |
11276d53 PZ |
36 | : : "i" (&((char *)key)[branch]) : : l_yes); |
37 | ||
38 | return false; | |
39 | l_yes: | |
40 | return true; | |
41 | } | |
42 | ||
43 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) | |
44 | { | |
45 | asm_volatile_goto("1:\tj %l[l_yes]\n\t" | |
46 | "nop\n\t" | |
47 | ".pushsection __jump_table, \"aw\"\n\t" | |
48 | WORD_INSN " 1b, %l[l_yes], %0\n\t" | |
49 | ".popsection\n\t" | |
50 | : : "i" (&((char *)key)[branch]) : : l_yes); | |
51 | ||
d430d3d7 JB |
52 | return false; |
53 | l_yes: | |
54 | return true; | |
55 | } | |
94bb0c1a | 56 | |
94bb0c1a DD |
57 | #ifdef CONFIG_64BIT |
58 | typedef u64 jump_label_t; | |
59 | #else | |
60 | typedef u32 jump_label_t; | |
61 | #endif | |
62 | ||
63 | struct jump_entry { | |
64 | jump_label_t code; | |
65 | jump_label_t target; | |
66 | jump_label_t key; | |
67 | }; | |
68 | ||
55dd0df7 | 69 | #endif /* __ASSEMBLY__ */ |
94bb0c1a | 70 | #endif /* _ASM_MIPS_JUMP_LABEL_H */ |