arch/loongarch/include/asm/jump_label.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2023 Loongson Technology Corporation Limited
   4  *
   5  * Based on arch/arm64/include/asm/jump_label.h
   6  */
   7 #ifndef __ASM_JUMP_LABEL_H
   8 #define __ASM_JUMP_LABEL_H
   9
  10 #ifndef __ASSEMBLY__
  11
  12 #include <linux/types.h>
  13
  14 #define JUMP_LABEL_NOP_SIZE     4
  15
  16 #define JUMP_TABLE_ENTRY                                \
  17          ".pushsection  __jump_table, \"aw\"    \n\t"   \
  18          ".align        3                       \n\t"   \
  19          ".long         1b - ., %l[l_yes] - .   \n\t"   \
  20          ".quad         %0 - .                  \n\t"   \
  21          ".popsection                           \n\t"
  22
  23 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
  24 {
  25         asm_volatile_goto(
  26                 "1:     nop                     \n\t"
  27                 JUMP_TABLE_ENTRY
  28                 :  :  "i"(&((char *)key)[branch]) :  : l_yes);
  29
  30         return false;
  31
  32 l_yes:
  33         return true;
  34 }
  35
  36 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
  37 {
  38         asm_volatile_goto(
  39                 "1:     b       %l[l_yes]       \n\t"
  40                 JUMP_TABLE_ENTRY
  41                 :  :  "i"(&((char *)key)[branch]) :  : l_yes);
  42
  43         return false;
  44
  45 l_yes:
  46         return true;
  47 }
  48
  49 #endif  /* __ASSEMBLY__ */
  50 #endif  /* __ASM_JUMP_LABEL_H */