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 struct module;
19 extern void jump_label_apply_nops(struct module *mod);
20
21 #define JUMP_LABEL_NOP_SIZE 4
22
23 #ifdef CONFIG_64BIT
24 #define WORD_INSN ".dword"
25 #else
26 #define WORD_INSN ".word"
27 #endif
28
29 #ifdef CONFIG_CPU_MICROMIPS
30 # define B_INSN "b32"
31 # define J_INSN "j32"
32 #elif MIPS_ISA_REV >= 6
33 # define B_INSN "bc"
34 # define J_INSN "bc"
35 #else
36 # define B_INSN "b"
37 # define J_INSN "j"
38 #endif
39
40 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
41 {
42 asm goto("1:\t" B_INSN " 2f\n\t"
43 "2:\t.insn\n\t"
44 ".pushsection __jump_table, \"aw\"\n\t"
45 WORD_INSN " 1b, %l[l_yes], %0\n\t"
46 ".popsection\n\t"
47 : : "i" (&((char *)key)[branch]) : : l_yes);
48
49 return false;
50 l_yes:
51 return true;
52 }
53
54 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
55 {
56 asm goto("1:\t" J_INSN " %l[l_yes]\n\t"
57 ".pushsection __jump_table, \"aw\"\n\t"
58 WORD_INSN " 1b, %l[l_yes], %0\n\t"
59 ".popsection\n\t"
60 : : "i" (&((char *)key)[branch]) : : l_yes);
61
62 return false;
63 l_yes:
64 return true;
65 }
66
67 #ifdef CONFIG_64BIT
68 typedef u64 jump_label_t;
69 #else
70 typedef u32 jump_label_t;
71 #endif
72
73 struct jump_entry {
74 jump_label_t code;
75 jump_label_t target;
76 jump_label_t key;
77 };
78
79 #endif /* __ASSEMBLY__ */
80 #endif /* _ASM_MIPS_JUMP_LABEL_H */
81
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