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_volatile_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