arch/tile/include/asm/jump_label.h

   1 /*
   2  * Copyright 2015 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_JUMP_LABEL_H
  16 #define _ASM_TILE_JUMP_LABEL_H
  17
  18 #include <arch/opcode.h>
  19
  20 #define JUMP_LABEL_NOP_SIZE     TILE_BUNDLE_SIZE_IN_BYTES
  21
  22 static __always_inline bool arch_static_branch(struct static_key *key,
  23                                                bool branch)
  24 {
  25         asm_volatile_goto("1:\n\t"
  26                 "nop" "\n\t"
  27                 ".pushsection __jump_table,  \"aw\"\n\t"
  28                 ".quad 1b, %l[l_yes], %0 + %1 \n\t"
  29                 ".popsection\n\t"
  30                 : :  "i" (key), "i" (branch) : : l_yes);
  31         return false;
  32 l_yes:
  33         return true;
  34 }
  35
  36 static __always_inline bool arch_static_branch_jump(struct static_key *key,
  37                                                     bool branch)
  38 {
  39         asm_volatile_goto("1:\n\t"
  40                 "j %l[l_yes]" "\n\t"
  41                 ".pushsection __jump_table,  \"aw\"\n\t"
  42                 ".quad 1b, %l[l_yes], %0 + %1 \n\t"
  43                 ".popsection\n\t"
  44                 : :  "i" (key), "i" (branch) : : l_yes);
  45         return false;
  46 l_yes:
  47         return true;
  48 }
  49
  50 typedef u64 jump_label_t;
  51
  52 struct jump_entry {
  53         jump_label_t code;
  54         jump_label_t target;
  55         jump_label_t key;
  56 };
  57
  58 #endif /* _ASM_TILE_JUMP_LABEL_H */