#ifndef _ASM_X86_JUMP_LABEL_H | |
#define _ASM_X86_JUMP_LABEL_H | |
#ifdef __KERNEL__ | |
#include <linux/types.h> | |
#include <asm/nops.h> | |
#include <asm/asm.h> | |
#define JUMP_LABEL_NOP_SIZE 5 | |
#define STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" | |
static __always_inline bool arch_static_branch(struct static_key *key) | |
{ | |
asm goto("1:" | |
STATIC_KEY_INITIAL_NOP | |
".pushsection __jump_table, \"aw\" \n\t" | |
_ASM_ALIGN "\n\t" | |
_ASM_PTR "1b, %l[l_yes], %c0 \n\t" | |
".popsection \n\t" | |
: : "i" (key) : : l_yes); | |
return false; | |
l_yes: | |
return true; | |
} | |
#endif /* __KERNEL__ */ | |
#ifdef CONFIG_X86_64 | |
typedef u64 jump_label_t; | |
#else | |
typedef u32 jump_label_t; | |
#endif | |
struct jump_entry { | |
jump_label_t code; | |
jump_label_t target; | |
jump_label_t key; | |
}; | |
#endif |