arch/arm/include/asm/jump_label.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_ARM_JUMP_LABEL_H
   3 #define _ASM_ARM_JUMP_LABEL_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #include <linux/types.h>
   8 #include <asm/unified.h>
   9
  10 #define JUMP_LABEL_NOP_SIZE 4
  11
  12 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
  13 {
  14         asm_volatile_goto("1:\n\t"
  15                  WASM(nop) "\n\t"
  16                  ".pushsection __jump_table,  \"aw\"\n\t"
  17                  ".word 1b, %l[l_yes], %c0\n\t"
  18                  ".popsection\n\t"
  19                  : :  "i" (&((char *)key)[branch]) :  : l_yes);
  20
  21         return false;
  22 l_yes:
  23         return true;
  24 }
  25
  26 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
  27 {
  28         asm_volatile_goto("1:\n\t"
  29                  WASM(b) " %l[l_yes]\n\t"
  30                  ".pushsection __jump_table,  \"aw\"\n\t"
  31                  ".word 1b, %l[l_yes], %c0\n\t"
  32                  ".popsection\n\t"
  33                  : :  "i" (&((char *)key)[branch]) :  : l_yes);
  34
  35         return false;
  36 l_yes:
  37         return true;
  38 }
  39
  40 typedef u32 jump_label_t;
  41
  42 struct jump_entry {
  43         jump_label_t code;
  44         jump_label_t target;
  45         jump_label_t key;
  46 };
  47
  48 #endif  /* __ASSEMBLY__ */
  49 #endif