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 #define arch_jump_label_transform_static arch_jump_label_transform
12
13 #ifndef __ASSEMBLY__
14
15 #include <linux/types.h>
16 #include <asm/isa-rev.h>
17
18 #define JUMP_LABEL_NOP_SIZE 4
19
20 #ifdef CONFIG_64BIT
21 #define WORD_INSN ".dword"
22 #else
23 #define WORD_INSN ".word"
24 #endif
25
26 #ifdef CONFIG_CPU_MICROMIPS
27 # define B_INSN "b32"
28 # define J_INSN "j32"
29 #elif MIPS_ISA_REV >= 6
30 # define B_INSN "bc"
31 # define J_INSN "bc"
32 #else
33 # define B_INSN "b"
34 # define J_INSN "j"
35 #endif
36
arch_static_branch(struct static_key * key,bool branch)37 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
38 {
39 asm goto("1:\t" B_INSN " 2f\n\t"
40 "2:\t.insn\n\t"
41 ".pushsection __jump_table, \"aw\"\n\t"
42 WORD_INSN " 1b, %l[l_yes], %0\n\t"
43 ".popsection\n\t"
44 : : "i" (&((char *)key)[branch]) : : l_yes);
45
46 return false;
47 l_yes:
48 return true;
49 }
50
arch_static_branch_jump(struct static_key * key,bool branch)51 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
52 {
53 asm goto("1:\t" J_INSN " %l[l_yes]\n\t"
54 ".pushsection __jump_table, \"aw\"\n\t"
55 WORD_INSN " 1b, %l[l_yes], %0\n\t"
56 ".popsection\n\t"
57 : : "i" (&((char *)key)[branch]) : : l_yes);
58
59 return false;
60 l_yes:
61 return true;
62 }
63
64 #ifdef CONFIG_64BIT
65 typedef u64 jump_label_t;
66 #else
67 typedef u32 jump_label_t;
68 #endif
69
70 struct jump_entry {
71 jump_label_t code;
72 jump_label_t target;
73 jump_label_t key;
74 };
75
76 #endif /* __ASSEMBLY__ */
77 #endif /* _ASM_MIPS_JUMP_LABEL_H */
78