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