arch/arm/include/asm/jump_label.h

   1 #ifndef _ASM_ARM_JUMP_LABEL_H
   2 #define _ASM_ARM_JUMP_LABEL_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/types.h>
   7 #include <asm/system.h>
   8
   9 #define JUMP_LABEL_NOP_SIZE 4
  10
  11 #ifdef CONFIG_THUMB2_KERNEL
  12 #define JUMP_LABEL_NOP  "nop.w"
  13 #else
  14 #define JUMP_LABEL_NOP  "nop"
  15 #endif
  16
  17 static __always_inline bool arch_static_branch(struct static_key *key)
  18 {
  19         asm goto("1:\n\t"
  20                  JUMP_LABEL_NOP "\n\t"
  21                  ".pushsection __jump_table,  \"aw\"\n\t"
  22                  ".word 1b, %l[l_yes], %c0\n\t"
  23                  ".popsection\n\t"
  24                  : :  "i" (key) :  : l_yes);
  25
  26         return false;
  27 l_yes:
  28         return true;
  29 }
  30
  31 #endif /* __KERNEL__ */
  32
  33 typedef u32 jump_label_t;
  34
  35 struct jump_entry {
  36         jump_label_t code;
  37         jump_label_t target;
  38         jump_label_t key;
  39 };
  40
  41 #endif