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Linux/arch/x86/include/asm/jump_label.h

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  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 STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
 13 
 14 static __always_inline bool arch_static_branch(struct static_key *key)
 15 {
 16         asm goto("1:"
 17                 STATIC_KEY_INITIAL_NOP
 18                 ".pushsection __jump_table,  \"aw\" \n\t"
 19                 _ASM_ALIGN "\n\t"
 20                 _ASM_PTR "1b, %l[l_yes], %c0 \n\t"
 21                 ".popsection \n\t"
 22                 : :  "i" (key) : : l_yes);
 23         return false;
 24 l_yes:
 25         return true;
 26 }
 27 
 28 #endif /* __KERNEL__ */
 29 
 30 #ifdef CONFIG_X86_64
 31 typedef u64 jump_label_t;
 32 #else
 33 typedef u32 jump_label_t;
 34 #endif
 35 
 36 struct jump_entry {
 37         jump_label_t code;
 38         jump_label_t target;
 39         jump_label_t key;
 40 };
 41 
 42 #endif
 43 

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