1. 根目录:
2. arch
3. sparc
4. include
5. asm
6. jump_label.h

#ifndef _ASM_SPARC_JUMP_LABEL_H
#define _ASM_SPARC_JUMP_LABEL_H

#ifndef __ASSEMBLY__

#include <linux/types.h>

#define JUMP_LABEL_NOP_SIZE 4

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:\n\t"
		 "nop\n\t"
		 "nop\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 ".align 4\n\t"
		 ".word 1b, %l[l_yes], %c0\n\t"
		 ".popsection \n\t"
		 : :  "i" (&((char *)key)[branch]) : : l_yes);

	return false;
l_yes:
	return true;
}

static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:\n\t"
		 "b %l[l_yes]\n\t"
		 "nop\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 ".align 4\n\t"
		 ".word 1b, %l[l_yes], %c0\n\t"
		 ".popsection \n\t"
		 : :  "i" (&((char *)key)[branch]) : : l_yes);

	return false;
l_yes:
	return true;
}

typedef u32 jump_label_t;

struct jump_entry {
	jump_label_t code;
	jump_label_t target;
	jump_label_t key;
};

#endif  /* __ASSEMBLY__ */
#endif