1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_JUMP_LABEL_H
3 #define _ASM_X86_JUMP_LABEL_H
4
5 #define HAVE_JUMP_LABEL_BATCH
6
7 #include <asm/asm.h>
8 #include <asm/nops.h>
9
10 #ifndef __ASSEMBLY__
11
12 #include <linux/stringify.h>
13 #include <linux/types.h>
14
15 #define JUMP_TABLE_ENTRY \
16 ".pushsection __jump_table, \"aw\" \n\t" \
17 _ASM_ALIGN "\n\t" \
18 ".long 1b - . \n\t" \
19 ".long %l[l_yes] - . \n\t" \
20 _ASM_PTR "%c0 + %c1 - .\n\t" \
21 ".popsection \n\t"
22
23 #ifdef CONFIG_HAVE_JUMP_LABEL_HACK
24
25 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
26 {
27 asm goto("1:"
28 "jmp %l[l_yes] # objtool NOPs this \n\t"
29 JUMP_TABLE_ENTRY
30 : : "i" (key), "i" (2 | branch) : : l_yes);
31
32 return false;
33 l_yes:
34 return true;
35 }
36
37 #else /* !CONFIG_HAVE_JUMP_LABEL_HACK */
38
39 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
40 {
41 asm goto("1:"
42 ".byte " __stringify(BYTES_NOP5) "\n\t"
43 JUMP_TABLE_ENTRY
44 : : "i" (key), "i" (branch) : : l_yes);
45
46 return false;
47 l_yes:
48 return true;
49 }
50
51 #endif /* CONFIG_HAVE_JUMP_LABEL_HACK */
52
53 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
54 {
55 asm goto("1:"
56 "jmp %l[l_yes]\n\t"
57 JUMP_TABLE_ENTRY
58 : : "i" (key), "i" (branch) : : l_yes);
59
60 return false;
61 l_yes:
62 return true;
63 }
64
65 extern int arch_jump_entry_size(struct jump_entry *entry);
66
67 #endif /* __ASSEMBLY__ */
68
69 #endif
70
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.