1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_ARM_JUMP_LABEL_H
3*4882a593Smuzhiyun #define _ASM_ARM_JUMP_LABEL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #ifndef __ASSEMBLY__
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/types.h>
8*4882a593Smuzhiyun #include <asm/unified.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #define JUMP_LABEL_NOP_SIZE 4
11*4882a593Smuzhiyun
arch_static_branch(struct static_key * key,bool branch)12*4882a593Smuzhiyun static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun asm_volatile_goto("1:\n\t"
15*4882a593Smuzhiyun WASM(nop) "\n\t"
16*4882a593Smuzhiyun ".pushsection __jump_table, \"aw\"\n\t"
17*4882a593Smuzhiyun ".word 1b, %l[l_yes], %c0\n\t"
18*4882a593Smuzhiyun ".popsection\n\t"
19*4882a593Smuzhiyun : : "i" (&((char *)key)[branch]) : : l_yes);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun return false;
22*4882a593Smuzhiyun l_yes:
23*4882a593Smuzhiyun return true;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
arch_static_branch_jump(struct static_key * key,bool branch)26*4882a593Smuzhiyun static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun asm_volatile_goto("1:\n\t"
29*4882a593Smuzhiyun WASM(b) " %l[l_yes]\n\t"
30*4882a593Smuzhiyun ".pushsection __jump_table, \"aw\"\n\t"
31*4882a593Smuzhiyun ".word 1b, %l[l_yes], %c0\n\t"
32*4882a593Smuzhiyun ".popsection\n\t"
33*4882a593Smuzhiyun : : "i" (&((char *)key)[branch]) : : l_yes);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return false;
36*4882a593Smuzhiyun l_yes:
37*4882a593Smuzhiyun return true;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun typedef u32 jump_label_t;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun struct jump_entry {
43*4882a593Smuzhiyun jump_label_t code;
44*4882a593Smuzhiyun jump_label_t target;
45*4882a593Smuzhiyun jump_label_t key;
46*4882a593Smuzhiyun };
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
49*4882a593Smuzhiyun #endif
50