LEDiS/op_f7.c at master · urxp/LEDiS · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
#include"bin2inc.h"

boolean op_f7(void){

    char * mod_rm_str;
    char * o_size;
    char * mnems[8] = { "test", 0, "not", "neg", "mul", "imul", "div", "idiv" };
    char * mnemonic;
    char * imm_str;

    address_mode = read_byte();
    mod_rm_str = mod_rm();


    mnemonic = mnems[(address_mode >> 3) & 7];

    if(!mnemonic) return boolean(0);

    if(operand_size == 32){
        o_size = "dword ";
    }
    else if(operand_size == 16){
        o_size = "word ";
    }
    else return boolean(0);

    if(((address_mode >> 6) & 3) == 3) o_size = "";

    switch((address_mode >> 3)&7){
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
        sprintf(ibuffer, iFORMAT"%s%s",
            mnemonic, o_size, mod_rm_str);
        break;
    case 0:
        if(operand_size == 32){
            fx = le_checkFixup(current_va.obj_n, current_va.offset);
            if((fx->type == 7)&&(fx->size == 4)){
                read_dword();
                imm_str = getLabel(fx->object_n, fx->target);
            }
            else{
                imm_str = hexbyte(read_dword());
            }
        }
        else if(operand_size == 16){
            fx = le_checkFixup(current_va.obj_n, current_va.offset);
            if(fx->size != 0){
                printf("[DISASM] ::: %s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
                printf("[DISASM] [TODO] 16-bit offset fixup\n");
                return boolean(0);
            }
            else{
                imm_str = hexbyte(read_word());
            }
        }
        else return boolean(0);

        sprintf(ibuffer, iFORMAT"%s%s, %s",
        mnemonic, o_size, mod_rm_str, imm_str);
        break;
    default:
        return boolean(0);
    }

    mark_instruction();// comment_instruction();
    // push next instruction offset to stack
    IDisasm.pushAddress(&current_va);

    return boolean(1);
}