insn.c File Reference

#include <string.h>
#include <asm/inat.h>
#include <asm/insn.h>

Go to the source code of this file.

Macros
#define	validate_next(t, insn, n)   ((insn)->next_byte + sizeof(t) + n - (insn)->kaddr <= MAX_INSN_SIZE)
#define	__get_next(t, insn)   ({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); r; })
#define	__peek_nbyte_next(t, insn, n)   ({ t r = *(t*)((insn)->next_byte + n); r; })
#define	get_next(t, insn)   ({ if (unlikely(!validate_next(t, insn, 0))) goto err_out; __get_next(t, insn); })
#define	peek_nbyte_next(t, insn, n)   ({ if (unlikely(!validate_next(t, insn, n))) goto err_out; __peek_nbyte_next(t, insn, n); })
#define	peek_next(t, insn)   peek_nbyte_next(t, insn, 0)

Functions
void	insn_init (struct insn *insn, const void *kaddr, int x86_64)
void	insn_get_prefixes (struct insn *insn)
void	insn_get_opcode (struct insn *insn)
void	insn_get_modrm (struct insn *insn)
int	insn_rip_relative (struct insn *insn)
void	insn_get_sib (struct insn *insn)
void	insn_get_displacement (struct insn *insn)
void	insn_get_immediate (struct insn *insn)
void	insn_get_length (struct insn *insn)

Macro Definition Documentation

#define __get_next	(		t,
			insn
	)		({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); r; })

Definition at line 33 of file insn.c.

#define __peek_nbyte_next	(		t,
			insn,
			n
	)		({ t r = *(t*)((insn)->next_byte + n); r; })

Definition at line 36 of file insn.c.

#define get_next	(		t,
			insn
	)		({ if (unlikely(!validate_next(t, insn, 0))) goto err_out; __get_next(t, insn); })

Definition at line 39 of file insn.c.

#define peek_nbyte_next	(		t,
			insn,
			n
	)		({ if (unlikely(!validate_next(t, insn, n))) goto err_out; __peek_nbyte_next(t, insn, n); })

Definition at line 42 of file insn.c.

#define peek_next	(		t,
			insn
	)		peek_nbyte_next(t, insn, 0)

Definition at line 45 of file insn.c.

#define validate_next	(		t,
			insn,
			n
	)		((insn)->next_byte + sizeof(t) + n - (insn)->kaddr <= MAX_INSN_SIZE)

Definition at line 30 of file insn.c.

Function Documentation

void insn_get_displacement

(

struct insn *

insn

)

insn_get_displacement() - Get the displacement of instruction : &struct insn containing instruction

If necessary, first collects the instruction up to and including the SIB byte. Displacement value is sign-expanded.

Definition at line 331 of file insn.c.

void insn_get_immediate

(

struct insn *

insn

)

insn_get_immediate() - Get the immediates of instruction : &struct insn containing instruction

If necessary, first collects the instruction up to and including the displacement bytes. Basically, most of immediates are sign-expanded. Unsigned-value can be get by bit masking with ((1 << (nbytes * 8)) - 1)

Definition at line 502 of file insn.c.

void insn_get_length

(

struct insn *

insn

)

insn_get_length() - Get the length of instruction : &struct insn containing instruction

If necessary, first collects the instruction up to and including the immediates bytes.

Definition at line 572 of file insn.c.

void insn_get_modrm

(

struct insn *

insn

)

insn_get_modrm - collect ModRM byte, if any : &struct insn containing instruction

Populates ->modrm and updates ->next_byte to point past the ModRM byte, if any. If necessary, first collects the preceding bytes (prefixes and opcode(s)). No effect if ->modrm.got is already 1.

Definition at line 240 of file insn.c.

void insn_get_opcode

(

struct insn *

insn

)

insn_get_opcode - collect opcode(s) : &struct insn containing instruction

Populates ->opcode, updates ->next_byte to point past the opcode byte(s), and set ->attr (except for groups). If necessary, first collects any preceding (prefix) bytes. Sets ->opcode.value = opcode1. No effect if ->opcode.got is already 1.

Definition at line 189 of file insn.c.

void insn_get_prefixes

(

struct insn *

insn

)

insn_get_prefixes - scan x86 instruction prefix bytes : &struct insn containing instruction

Populates the ->prefixes bitmap, and updates ->next_byte to point to the (first) opcode. No effect if ->prefixes.got is already set.

Definition at line 74 of file insn.c.

void insn_get_sib

(

struct insn *

insn

)

insn_get_sib() - Get the SIB byte of instruction : &struct insn containing instruction

If necessary, first collects the instruction up to and including the ModRM byte.

Definition at line 300 of file insn.c.

void insn_init	(	struct insn *	insn,
		const void *	kaddr,
		int	x86_64
	)

insn_init() - initialize struct insn : &struct insn to be initialized : address (in kernel memory) of instruction (or copy thereof) : !0 for 64-bit kernel or 64-bit app

Definition at line 53 of file insn.c.

int insn_rip_relative

(

struct insn *

insn

)

insn_rip_relative() - Does instruction use RIP-relative addressing mode? : &struct insn containing instruction

If necessary, first collects the instruction up to and including the ModRM byte. No effect if ->x86_64 is 0.

Definition at line 278 of file insn.c.