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 9 #define JUMP_LABEL_NOP_SIZE 5 10 11 # define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" 12 13 # define JUMP_LABEL(key, label) \ 14 do { \ 15 asm goto("1:" \ 16 JUMP_LABEL_INITIAL_NOP \ 17 ".pushsection __jump_table, \"aw\" \n\t"\ 18 _ASM_PTR "1b, %l[" #label "], %c0 \n\t" \ 19 ".popsection \n\t" \ 20 : : "i" (key) : : label); \ 21 } while (0) 22 23 #endif /* __KERNEL__ */ 24 25 #ifdef CONFIG_X86_64 26 typedef u64 jump_label_t; 27 #else 28 typedef u32 jump_label_t; 29 #endif 30 31 struct jump_entry { 32 jump_label_t code; 33 jump_label_t target; 34 jump_label_t key; 35 }; 36 37 #endif 38