xref: /linux/arch/arm/include/asm/jump_label.h (revision 0d456bad36d42d16022be045c8a53ddbb59ee478)
1 #ifndef _ASM_ARM_JUMP_LABEL_H
2 #define _ASM_ARM_JUMP_LABEL_H
3 
4 #ifdef __KERNEL__
5 
6 #include <linux/types.h>
7 #include <asm/system.h>
8 
9 #define JUMP_LABEL_NOP_SIZE 4
10 
11 #ifdef CONFIG_THUMB2_KERNEL
12 #define JUMP_LABEL_NOP	"nop.w"
13 #else
14 #define JUMP_LABEL_NOP	"nop"
15 #endif
16 
17 static __always_inline bool arch_static_branch(struct static_key *key)
18 {
19 	asm goto("1:\n\t"
20 		 JUMP_LABEL_NOP "\n\t"
21 		 ".pushsection __jump_table,  \"aw\"\n\t"
22 		 ".word 1b, %l[l_yes], %c0\n\t"
23 		 ".popsection\n\t"
24 		 : :  "i" (key) :  : l_yes);
25 
26 	return false;
27 l_yes:
28 	return true;
29 }
30 
31 #endif /* __KERNEL__ */
32 
33 typedef u32 jump_label_t;
34 
35 struct jump_entry {
36 	jump_label_t code;
37 	jump_label_t target;
38 	jump_label_t key;
39 };
40 
41 #endif
42