Rabin Vincent | 09f05d8 | 2012-02-18 17:52:41 +0100 | [diff] [blame] | 1 | #ifndef _ASM_ARM_JUMP_LABEL_H |
| 2 | #define _ASM_ARM_JUMP_LABEL_H |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | |
| 6 | #include <linux/types.h> |
Rabin Vincent | 09f05d8 | 2012-02-18 17:52:41 +0100 | [diff] [blame] | 7 | |
| 8 | #define JUMP_LABEL_NOP_SIZE 4 |
| 9 | |
| 10 | #ifdef CONFIG_THUMB2_KERNEL |
| 11 | #define JUMP_LABEL_NOP "nop.w" |
| 12 | #else |
| 13 | #define JUMP_LABEL_NOP "nop" |
| 14 | #endif |
| 15 | |
Rabin Vincent | 708e5978 | 2012-04-14 21:51:32 +0100 | [diff] [blame] | 16 | static __always_inline bool arch_static_branch(struct static_key *key) |
Rabin Vincent | 09f05d8 | 2012-02-18 17:52:41 +0100 | [diff] [blame] | 17 | { |
Ingo Molnar | 3f0116c | 2013-10-10 10:16:30 +0200 | [diff] [blame] | 18 | asm_volatile_goto("1:\n\t" |
Rabin Vincent | 09f05d8 | 2012-02-18 17:52:41 +0100 | [diff] [blame] | 19 | JUMP_LABEL_NOP "\n\t" |
| 20 | ".pushsection __jump_table, \"aw\"\n\t" |
| 21 | ".word 1b, %l[l_yes], %c0\n\t" |
| 22 | ".popsection\n\t" |
| 23 | : : "i" (key) : : l_yes); |
| 24 | |
| 25 | return false; |
| 26 | l_yes: |
| 27 | return true; |
| 28 | } |
| 29 | |
| 30 | #endif /* __KERNEL__ */ |
| 31 | |
| 32 | typedef u32 jump_label_t; |
| 33 | |
| 34 | struct jump_entry { |
| 35 | jump_label_t code; |
| 36 | jump_label_t target; |
| 37 | jump_label_t key; |
| 38 | }; |
| 39 | |
| 40 | #endif |