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 #include <asm/isa-rev.h>
  15
  16 #define JUMP_LABEL_NOP_SIZE 4
  17
  18 #ifdef CONFIG_64BIT
  19 #define WORD_INSN ".dword"
  20 #else
  21 #define WORD_INSN ".word"
  22 #endif
  23
  24 #ifdef CONFIG_CPU_MICROMIPS
  25 # define B_INSN "b32"
  26 # define J_INSN "j32"
  27 #elif MIPS_ISA_REV >= 6
  28 # define B_INSN "bc"
  29 # define J_INSN "bc"
  30 #else
  31 # define B_INSN "b"
  32 # define J_INSN "j"
  33 #endif
  34
  35 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
  36 {
  37         asm_volatile_goto("1:\t" B_INSN " 2f\n\t"
  38                 "2:\t.insn\n\t"
  39                 ".pushsection __jump_table,  \"aw\"\n\t"
  40                 WORD_INSN " 1b, %l[l_yes], %0\n\t"
  41                 ".popsection\n\t"
  42                 : :  "i" (&((char *)key)[branch]) : : l_yes);
  43
  44         return false;
  45 l_yes:
  46         return true;
  47 }
  48
  49 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
  50 {
  51         asm_volatile_goto("1:\t" J_INSN " %l[l_yes]\n\t"
  52                 ".pushsection __jump_table,  \"aw\"\n\t"
  53                 WORD_INSN " 1b, %l[l_yes], %0\n\t"
  54                 ".popsection\n\t"
  55                 : :  "i" (&((char *)key)[branch]) : : l_yes);
  56
  57         return false;
  58 l_yes:
  59         return true;
  60 }
  61
  62 #ifdef CONFIG_64BIT
  63 typedef u64 jump_label_t;
  64 #else
  65 typedef u32 jump_label_t;
  66 #endif
  67
  68 struct jump_entry {
  69         jump_label_t code;
  70         jump_label_t target;
  71         jump_label_t key;
  72 };
  73
  74 #endif  /* __ASSEMBLY__ */
  75 #endif /* _ASM_MIPS_JUMP_LABEL_H */