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ld32.h
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ld32.h
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/*
x86 Length Disassembler.
Copyright (C) 2013 Byron Platt
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __LD32_H__
#define __LD32_H__
// https://github.com/greenbender/lend/blob/master/
#include <stdint.h>
/* implemented tables */
#define PREFIX_T 1
#define MODRM2_T 2
#define MODRM_T 4
#define DATA1_T 8
#define DATA2_T 16
#define DATA66_T 32
/* configure tables */
#ifndef USE_T
#define USE_T (MODRM2_T|MODRM_T|DATA1_T|DATA66_T)
#endif
/* length_disasm */
uint32_t get_instruction_length (uint8_t* start);
/* table macros */
#ifdef USE_T
#define BITMASK32( \
b00,b01,b02,b03,b04,b05,b06,b07, \
b08,b09,b0a,b0b,b0c,b0d,b0e,b0f, \
b10,b11,b12,b13,b14,b15,b16,b17, \
b18,b19,b1a,b1b,b1c,b1d,b1e,b1f \
) ( \
(b00<<0x00)|(b01<<0x01)|(b02<<0x02)|(b03<<0x03)| \
(b04<<0x04)|(b05<<0x05)|(b06<<0x06)|(b07<<0x07)| \
(b08<<0x08)|(b09<<0x09)|(b0a<<0x0a)|(b0b<<0x0b)| \
(b0c<<0x0c)|(b0d<<0x0d)|(b0e<<0x0e)|(b0f<<0x0f)| \
(b10<<0x10)|(b11<<0x11)|(b12<<0x12)|(b13<<0x13)| \
(b14<<0x14)|(b15<<0x15)|(b16<<0x16)|(b17<<0x17)| \
(b18<<0x18)|(b19<<0x19)|(b1a<<0x1a)|(b1b<<0x1b)| \
(b1c<<0x1c)|(b1d<<0x1d)|(b1e<<0x1e)|(b1f<<0x1f) \
)
#define CHECK_TABLE(t, v) ((t[(v)>>5]>>((v)&0x1f))&1)
#endif
/* CHECK_PREFIX */
#if defined(USE_T) && (USE_T & PREFIX_T)
const static unsigned int prefix_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 0 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 1 */
BITMASK32 (0,0,0,0,0,0,1,0, 0,0,0,0,0,0,1,0, /* 2 */
0,0,0,0,0,0,1,0, 0,0,0,0,0,0,1,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,0,0,1,1,1,1, 0,0,0,0,0,0,0,0, /* 6 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 7 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 8 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 9 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* a */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* b */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* c */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* d */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* e */
1,0,1,1,0,0,0,0, 0,0,0,0,0,0,0,0) /* f */
};
#define CHECK_PREFIX(v) CHECK_TABLE(prefix_t, v)
#else
#define CHECK_PREFIX(v) \
(((v)&0xe7)==0x26||((v)&0xfc)==0x64||(v)==0xf0||(v)==0xf2||(v)==0xf3)
#endif
/* CHECK_PREFIX_66 */
#define CHECK_PREFIX_66(v) ((v)==0x66)
/* CHECK_PREFIX_67 */
#define CHECK_PREFIX_67(v) ((v)==0x67)
/* CHECK_0F */
#define CHECK_0F(v) ((v)==0x0f)
/* CHECK_MODRM2 */
#if defined(USE_T) && (USE_T & MODRM2_T)
const static unsigned int modrm2_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (1,1,1,1,0,0,0,0, 0,0,0,0,0,0,0,0, /* 0 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 1 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 2 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 6 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 7 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 8 */
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1), /* 9 */
BITMASK32 (0,0,0,1,1,1,0,0, 0,0,0,1,1,1,0,1, /* a */
1,1,1,1,1,1,1,1, 0,0,1,1,1,1,1,1), /* b */
BITMASK32 (1,1,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* c */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* d */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* e */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0) /* f */
};
#define CHECK_MODRM2(v) CHECK_TABLE(modrm2_t, v)
#else
#define CHECK_MODRM2(v) (__extension__ ({ \
register BYTE __a=(v)&0xfc, __b=(v)&0xfe; \
((v)&0xf0)==0x90||((v)&0xf8)==0xb0||((v)&0xf6)==0xa4|| \
__a==0x00||__a==0xbc||__b==0xba||__b==0xc0|| \
(v)==0xa3||(v)==0xab||(v)==0xaf; \
}))
#endif
/* CHECK_DATA12 */
#define CHECK_DATA12(v) ((v)==0xa4||(v)==0xac||(v)==0xba)
/* CHECK_DATA662 */
#define CHECK_DATA662(v) (((v)&0xf0)==0x80)
/* CHECK_MODRM */
#if defined(USE_T) && (USE_T & MODRM_T)
const static unsigned int modrm_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (1,1,1,1,0,0,0,0, 1,1,1,1,0,0,0,0, /* 0 */
1,1,1,1,0,0,0,0, 1,1,1,1,0,0,0,0), /* 1 */
BITMASK32 (1,1,1,1,0,0,0,0, 1,1,1,1,0,0,0,0, /* 2 */
1,1,1,1,0,0,0,0, 1,1,1,1,0,0,0,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,1,1,0,0,0,0, 0,1,0,1,0,0,0,0, /* 6 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 7 */
BITMASK32 (1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, /* 8 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 9 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* a */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* b */
BITMASK32 (1,1,0,0,1,1,1,1, 0,0,0,0,0,0,0,0, /* c */
1,1,1,1,0,0,0,0, 1,1,1,1,1,1,1,1), /* d */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* e */
0,0,0,0,0,0,1,1, 0,0,0,0,0,0,1,1) /* f */
};
#define CHECK_MODRM(v) CHECK_TABLE(modrm_t, v)
#else
#define CHECK_MODRM(v) (__extension__ ({ \
register BYTE __a=(v)&0xfc, __b=(v)&0xfe; \
((v)&0xc4)==0x00||((v)&0xf0)==0x80||((v)&0xf8)==0xd8||((v)&0xf6)==0xf6|| \
__a==0xc4||__a==0xd0||__b==0x62||__b==0xc0|| \
(v)==0x69||(v)==0x6b; \
}))
#endif
/* CHECK_TEST */
#define CHECK_TEST(v) ((v)==0xf6||(v)==0xf7)
/* CHECK_DATA1 */
#if defined(USE_T) && (USE_T & DATA1_T)
const static unsigned int data1_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (0,0,0,0,1,0,0,0, 0,0,0,0,1,0,0,0, /* 0 */
0,0,0,0,1,0,0,0, 0,0,0,0,1,0,0,0), /* 1 */
BITMASK32 (0,0,0,0,1,0,0,0, 0,0,0,0,1,0,0,0, /* 2 */
0,0,0,0,1,0,0,0, 0,0,0,0,1,0,0,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,1,1,0,0,0,0, /* 6 */
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1), /* 7 */
BITMASK32 (1,0,1,1,0,0,0,0, 0,0,0,0,0,0,0,0, /* 8 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 9 */
BITMASK32 (0,0,0,0,0,0,0,0, 1,0,0,0,0,0,0,0, /* a */
1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0), /* b */
BITMASK32 (1,1,0,0,0,0,1,0, 1,0,0,0,0,1,0,0, /* c */
0,0,0,0,1,1,0,0, 0,0,0,0,0,0,0,0), /* d */
BITMASK32 (1,1,1,1,1,1,1,1, 0,0,0,1,0,0,0,0, /* e */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0) /* f */
};
#define CHECK_DATA1(v) CHECK_TABLE(data1_t, v)
#else
#define CHECK_DATA1(v) (__extension__ ({ \
register BYTE __a=(v)&0xf8, __b=(v)&0xfe; \
((v)&0xf0)==0x70||((v)&0xc7)==0x04|| \
__a==0xb0||__a==0xe0||__b==0x6a||__b==0x82||__b==0xc0||__b==0xd4|| \
(v)==0x80||(v)==0xa8||(v)==0xc6||(v)==0xc8||(v)==0xcd||(v)==0xeb; \
}))
#endif
/* CHECK_DATA2 */
#if defined(USE_T) && (USE_T & DATA2_T)
const static unsigned int data2_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 0 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 1 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 2 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 6 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 7 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 8 */
0,0,0,0,0,0,0,0, 0,0,1,0,0,0,0,0), /* 9 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* a */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* b */
BITMASK32 (0,0,1,0,0,0,0,0, 1,0,1,0,0,0,0,0, /* c */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* d */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,1,0,0,0,0,0, /* e */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0) /* f */
};
#define CHECK_DATA2(v) CHECK_TABLE(data2_t, v)
#else
#define CHECK_DATA2(v) \
((v)==0x9a||(v)==0xc2||(v)==0xc8||(v)==0xca||(v)==0xea)
#endif
/* CHECK_DATA66 */
#if defined(USE_T) && (USE_T & DATA66_T)
const static unsigned int data66_t[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
BITMASK32 (0,0,0,0,0,1,0,0, 0,0,0,0,0,1,0,0, /* 0 */
0,0,0,0,0,1,0,0, 0,0,0,0,0,1,0,0), /* 1 */
BITMASK32 (0,0,0,0,0,1,0,0, 0,0,0,0,0,1,0,0, /* 2 */
0,0,0,0,0,1,0,0, 0,0,0,0,0,1,0,0), /* 3 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 4 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 5 */
BITMASK32 (0,0,0,0,0,0,0,0, 1,1,0,0,0,0,0,0, /* 6 */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* 7 */
BITMASK32 (0,1,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, /* 8 */
0,0,0,0,0,0,0,0, 0,0,1,0,0,0,0,0), /* 9 */
BITMASK32 (0,0,0,0,0,0,0,0, 0,1,0,0,0,0,0,0, /* a */
0,0,0,0,0,0,0,0, 1,1,1,1,1,1,1,1), /* b */
BITMASK32 (0,0,0,0,0,0,0,1, 0,0,0,0,0,0,0,0, /* c */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0), /* d */
BITMASK32 (0,0,0,0,0,0,0,0, 1,1,1,0,0,0,0,0, /* e */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0) /* f */
};
#define CHECK_DATA66(v) CHECK_TABLE(data66_t, v)
#else
#define CHECK_DATA66(v) \
(((v)&0xc7)==0x05||((v)&0xf8)==0xb8||((v)&0x7e)==0x68|| \
(v)==0x81||(v)==0x9a||(v)==0xa9||(v)==0xc7||(v)==0xea)
#endif
/* CHECK_MEM67 */
#define CHECK_MEM67(v) (((v)&0xfc)==0xa0)
#endif