arch/x86/include/asm/insn.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/insn.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/insn.h
Extension
.h
Size
9881 bytes
Lines
345
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct insn_field {
	union {
		insn_value_t value;
		insn_byte_t bytes[4];
	};
	/* !0 if we've run insn_get_xxx() for this field */
	unsigned char got;
	unsigned char nbytes;
};

static inline void insn_field_set(struct insn_field *p, insn_value_t v,
				  unsigned char n)
{
	p->value = v;
	p->nbytes = n;
}

static inline void insn_set_byte(struct insn_field *p, unsigned char n,
				 insn_byte_t v)
{
	p->bytes[n] = v;
}

#else

struct insn_field {
	insn_value_t value;
	union {
		insn_value_t little;
		insn_byte_t bytes[4];
	};
	/* !0 if we've run insn_get_xxx() for this field */
	unsigned char got;
	unsigned char nbytes;
};

static inline void insn_field_set(struct insn_field *p, insn_value_t v,
				  unsigned char n)
{
	p->value = v;
	p->little = __cpu_to_le32(v);
	p->nbytes = n;
}

static inline void insn_set_byte(struct insn_field *p, unsigned char n,
				 insn_byte_t v)
{
	p->bytes[n] = v;
	p->value = __le32_to_cpu(p->little);
}
#endif

struct insn {
	struct insn_field prefixes;	/*
					 * Prefixes
					 * prefixes.bytes[3]: last prefix
					 */
	struct insn_field rex_prefix;	/* REX prefix */
	union {
		struct insn_field vex_prefix;	/* VEX prefix */
		struct insn_field xop_prefix;	/* XOP prefix */
	};
	struct insn_field opcode;	/*
					 * opcode.bytes[0]: opcode1
					 * opcode.bytes[1]: opcode2
					 * opcode.bytes[2]: opcode3
					 */
	struct insn_field modrm;
	struct insn_field sib;
	struct insn_field displacement;
	union {
		struct insn_field immediate;
		struct insn_field moffset1;	/* for 64bit MOV */
		struct insn_field immediate1;	/* for 64bit imm or off16/32 */
	};
	union {
		struct insn_field moffset2;	/* for 64bit MOV */
		struct insn_field immediate2;	/* for 64bit imm or seg16 */
	};

	int	emulate_prefix_size;
	insn_attr_t attr;
	unsigned char opnd_bytes;
	unsigned char addr_bytes;
	unsigned char length;
	unsigned char x86_64;

	const insn_byte_t *kaddr;	/* kernel address of insn to analyze */
	const insn_byte_t *end_kaddr;	/* kernel address of last insn in buffer */
	const insn_byte_t *next_byte;

Annotation

Implementation Notes