| 1 | #ifndef _ASM_X86_JUMP_LABEL_H |
| 2 | #define _ASM_X86_JUMP_LABEL_H |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | |
| 6 | #include <linux/types.h> |
| 7 | #include <asm/nops.h> |
| 8 | #include <asm/asm.h> |
| 9 | |
| 10 | #define JUMP_LABEL_NOP_SIZE 5 |
| 11 | |
| 12 | #define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" |
| 13 | |
| 14 | static __always_inline bool arch_static_branch(struct jump_label_key *key) |
| 15 | { |
| 16 | asm goto("1:" |
| 17 | JUMP_LABEL_INITIAL_NOP |
| 18 | ".pushsection __jump_table, \"aw\" \n\t" |
| 19 | _ASM_PTR "1b, %l[l_yes], %c0 \n\t" |
| 20 | ".popsection \n\t" |
| 21 | : : "i" (key) : : l_yes); |
| 22 | return false; |
| 23 | l_yes: |
| 24 | return true; |
| 25 | } |
| 26 | |
| 27 | #endif /* __KERNEL__ */ |
| 28 | |
| 29 | #ifdef CONFIG_X86_64 |
| 30 | typedef u64 jump_label_t; |
| 31 | #else |
| 32 | typedef u32 jump_label_t; |
| 33 | #endif |
| 34 | |
| 35 | struct jump_entry { |
| 36 | jump_label_t code; |
| 37 | jump_label_t target; |
| 38 | jump_label_t key; |
| 39 | }; |
| 40 | |
| 41 | #endif |