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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_POWERPC_JUMP_LABEL_H
3#define _ASM_POWERPC_JUMP_LABEL_H
4
5/*
6 * Copyright 2010 Michael Ellerman, IBM Corp.
7 */
8
9#ifndef __ASSEMBLY__
10#include <linux/types.h>
11
12#include <asm/feature-fixups.h>
13#include <asm/asm-const.h>
14
15#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
16#define JUMP_LABEL_NOP_SIZE 4
17
18static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
19{
20 asm_volatile_goto("1:\n\t"
21 "nop # arch_static_branch\n\t"
22 ".pushsection __jump_table, \"aw\"\n\t"
23 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
24 ".popsection \n\t"
25 : : "i" (&((char *)key)[branch]) : : l_yes);
26
27 return false;
28l_yes:
29 return true;
30}
31
32static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
33{
34 asm_volatile_goto("1:\n\t"
35 "b %l[l_yes] # arch_static_branch_jump\n\t"
36 ".pushsection __jump_table, \"aw\"\n\t"
37 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
38 ".popsection \n\t"
39 : : "i" (&((char *)key)[branch]) : : l_yes);
40
41 return false;
42l_yes:
43 return true;
44}
45
46#ifdef CONFIG_PPC64
47typedef u64 jump_label_t;
48#else
49typedef u32 jump_label_t;
50#endif
51
52struct jump_entry {
53 jump_label_t code;
54 jump_label_t target;
55 jump_label_t key;
56};
57
58#else
59#define ARCH_STATIC_BRANCH(LABEL, KEY) \
601098: nop; \
61 .pushsection __jump_table, "aw"; \
62 FTR_ENTRY_LONG 1098b, LABEL, KEY; \
63 .popsection
64#endif
65
66#endif /* _ASM_POWERPC_JUMP_LABEL_H */