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
arch_static_branch(struct static_key * key,bool branch)18 static __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;
28 l_yes:
29 return true;
30 }
31
arch_static_branch_jump(struct static_key * key,bool branch)32 static __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;
42 l_yes:
43 return true;
44 }
45
46 #ifdef CONFIG_PPC64
47 typedef u64 jump_label_t;
48 #else
49 typedef u32 jump_label_t;
50 #endif
51
52 struct 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) \
60 1098: 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 */
67