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 #include <linux/types.h>
  12
  13 #ifdef __KERNEL__
  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 #define JUMP_LABEL(key, label)                                          \
  24         do {                                                            \
  25                 asm goto("1:\tnop\n\t"                                  \
  26                         "nop\n\t"                                       \
  27                         ".pushsection __jump_table,  \"a\"\n\t"         \
  28                         WORD_INSN " 1b, %l[" #label "], %0\n\t"         \
  29                         ".popsection\n\t"                               \
  30                         : :  "i" (key) :  : label);                     \
  31         } while (0)
  32
  33
  34 #endif /* __KERNEL__ */
  35
  36 #ifdef CONFIG_64BIT
  37 typedef u64 jump_label_t;
  38 #else
  39 typedef u32 jump_label_t;
  40 #endif
  41
  42 struct jump_entry {
  43         jump_label_t code;
  44         jump_label_t target;
  45         jump_label_t key;
  46 };
  47
  48 #endif /* _ASM_MIPS_JUMP_LABEL_H */