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
11 #ifndef __ASSEMBLY__
12
13 #include <linux/types.h>
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
23 #ifdef CONFIG_CPU_MICROMIPS
24 #define B_INSN "b32"
25 #else
26 #define B_INSN "b"
27 #endif
28
arch_static_branch(struct static_key * key,bool branch)29 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
30 {
31 asm_volatile_goto("1:\t" B_INSN " 2f\n\t"
32 "2:\tnop\n\t"
33 ".pushsection __jump_table, \"aw\"\n\t"
34 WORD_INSN " 1b, %l[l_yes], %0\n\t"
35 ".popsection\n\t"
36 : : "i" (&((char *)key)[branch]) : : l_yes);
37
38 return false;
39 l_yes:
40 return true;
41 }
42
arch_static_branch_jump(struct static_key * key,bool branch)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
52 return false;
53 l_yes:
54 return true;
55 }
56
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
69 #endif /* __ASSEMBLY__ */
70 #endif /* _ASM_MIPS_JUMP_LABEL_H */
71