arch/arm/include/asm/jump_label.h

   1 #ifndef _ASM_ARM_JUMP_LABEL_H
   2 #define _ASM_ARM_JUMP_LABEL_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 #include <linux/types.h>
   7 #include <asm/unified.h>
   8
   9 #define JUMP_LABEL_NOP_SIZE 4
  10
  11 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
  12 {
  13         asm_volatile_goto("1:\n\t"
  14                  WASM(nop) "\n\t"
  15                  ".pushsection __jump_table,  \"aw\"\n\t"
  16                  ".word 1b, %l[l_yes], %c0\n\t"
  17                  ".popsection\n\t"
  18                  : :  "i" (&((char *)key)[branch]) :  : l_yes);
  19
  20         return false;
  21 l_yes:
  22         return true;
  23 }
  24
  25 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
  26 {
  27         asm_volatile_goto("1:\n\t"
  28                  WASM(b) " %l[l_yes]\n\t"
  29                  ".pushsection __jump_table,  \"aw\"\n\t"
  30                  ".word 1b, %l[l_yes], %c0\n\t"
  31                  ".popsection\n\t"
  32                  : :  "i" (&((char *)key)[branch]) :  : l_yes);
  33
  34         return false;
  35 l_yes:
  36         return true;
  37 }
  38
  39 typedef u32 jump_label_t;
  40
  41 struct jump_entry {
  42         jump_label_t code;
  43         jump_label_t target;
  44         jump_label_t key;
  45 };
  46
  47 #endif  /* __ASSEMBLY__ */
  48 #endif