1#ifndef _ASM_S390_JUMP_LABEL_H
2#define _ASM_S390_JUMP_LABEL_H
3
4#ifndef __ASSEMBLY__
5
6#include <linux/types.h>
7
8#define JUMP_LABEL_NOP_SIZE 6
9#define JUMP_LABEL_NOP_OFFSET 2
10
11/*
12 * We use a brcl 0,2 instruction for jump labels at compile time so it
13 * can be easily distinguished from a hotpatch generated instruction.
14 */
15static __always_inline bool arch_static_branch(struct static_key *key)
16{
17	asm_volatile_goto("0:	brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
18		".pushsection __jump_table, \"aw\"\n"
19		".balign 8\n"
20		".quad 0b, %l[label], %0\n"
21		".popsection\n"
22		: : "X" (key) : : label);
23	return false;
24label:
25	return true;
26}
27
28typedef unsigned long jump_label_t;
29
30struct jump_entry {
31	jump_label_t code;
32	jump_label_t target;
33	jump_label_t key;
34};
35
36#endif  /* __ASSEMBLY__ */
37#endif
38