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 #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 NOP_INSN "nop32"
  25 #else
  26 #define NOP_INSN "nop"
  27 #endif
  28
  29 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
  30 {
  31         asm_volatile_goto("1:\t" NOP_INSN "\n\t"
  32                 "nop\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
  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 */