1 /* SPDX-License-Identifier: GPL-2.0 */ 1
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
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
26 {
27 asm goto("1:"
28 "jmp %l[l_yes] # objtool NOPs
29 JUMP_TABLE_ENTRY
30 : : "i" (key), "i" (2 | branc
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
40 {
41 asm goto("1:"
42 ".byte " __stringify(BYTES_NOP
43 JUMP_TABLE_ENTRY
44 : : "i" (key), "i" (branch) :
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
54 {
55 asm goto("1:"
56 "jmp %l[l_yes]\n\t"
57 JUMP_TABLE_ENTRY
58 : : "i" (key), "i" (branch) :
59
60 return false;
61 l_yes:
62 return true;
63 }
64
65 extern int arch_jump_entry_size(struct jump_en
66
67 #endif /* __ASSEMBLY__ */
68
69 #endif
70
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