LXR linux/arch/arm/include/asm/jump

   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
  12static __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;
  22l_yes:
  23        return true;
  24}
  25
  26static __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;
  36l_yes:
  37        return true;
  38}
  39
  40typedef u32 jump_label_t;
  41
  42struct jump_entry {
  43        jump_label_t code;
  44        jump_label_t target;
  45        jump_label_t key;
  46};
  47
  48#endif  /* __ASSEMBLY__ */
  49#endif
  50