arch/mips/include/asm/jump_label.h

   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 */