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
18 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
19 {
20 asm goto("1:\n\t"
21 "nop # arch_static_branch\n\t"
22 ".pushsection __jump_table, \"aw\"\n\t"
23 ".long 1b - ., %l[l_yes] - .\n\t"
24 JUMP_ENTRY_TYPE "%c0 - .\n\t"
25 ".popsection \n\t"
26 : : "i" (&((char *)key)[branch]) : : l_yes);
27
28 return false;
29 l_yes:
30 return true;
31 }
32
33 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
34 {
35 asm goto("1:\n\t"
36 "b %l[l_yes] # arch_static_branch_jump\n\t"
37 ".pushsection __jump_table, \"aw\"\n\t"
38 ".long 1b - ., %l[l_yes] - .\n\t"
39 JUMP_ENTRY_TYPE "%c0 - .\n\t"
40 ".popsection \n\t"
41 : : "i" (&((char *)key)[branch]) : : l_yes);
42
43 return false;
44 l_yes:
45 return true;
46 }
47
48 #else
49 #define ARCH_STATIC_BRANCH(LABEL, KEY) \
50 1098: nop; \
51 .pushsection __jump_table, "aw"; \
52 .long 1098b - ., LABEL - .; \
53 FTR_ENTRY_LONG KEY - .; \
54 .popsection
55 #endif
56
57 #endif /* _ASM_POWERPC_JUMP_LABEL_H */
58
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.