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disas.c
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disas.c
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/*
Модуль дизассемблирования.
Панасенко Дмитрий Игоревич, Маткин Илья Александрович 02.05.2020
*/
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include "disas.h"
#include "mz.h"
#include "system.h"
#define GET_VARS \
BYTE opc = *(mz->code + pos); \
BYTE addr = *(mz->code + pos + 1); \
/********/ \
BYTE num1 = *(mz->code + pos + 2); /* byte3 */ \
BYTE num2 = *(mz->code + pos + 1); /* byte2 */ \
WORD result; \
/********/ \
int D_S = (opc & 0b000000010) / 0b10; \
int W = opc & 0b000000001; \
/********/ \
int MOD = (addr & 0b11000000) / 0b1000000; \
int REG = (addr & 0b00111000) / 0b1000; \
int R_M = addr & 0b00000111; \
/********/ \
char* dest = chooseSet(MOD, R_M, W, num1); \
char* reg = get_reg(REG, W);
// массив опкодов (от 00 до FF)
d_func opcodes[] = {
d_add, d_add, d_add, d_add, d_add, d_add, d_push, d_pop,
d_or, d_or, d_or, d_or, d_or, d_or, d_push, d_unk,
d_adc, d_adc, d_adc, d_adc, d_adc, d_adc, d_push, d_pop,
d_sbb, d_sbb, d_sbb, d_sbb, d_sbb, d_sbb, d_push, d_pop,
d_and, d_and, d_and, d_and, d_and, d_and, d_es, d_daa,
d_sub, d_sub, d_sub, d_sub, d_sub, d_sub, d_cs, d_das,
d_xor, d_xor, d_xor, d_xor, d_xor, d_xor, d_ss, d_aaa,
d_cmp, d_cmp, d_cmp, d_cmp, d_cmp, d_cmp, d_ds, d_aas,
d_inc, d_inc, d_inc, d_inc, d_inc, d_inc, d_inc, d_inc,
d_dec, d_dec, d_dec, d_dec, d_dec, d_dec, d_dec, d_dec,
d_push, d_push, d_push, d_push, d_push, d_push, d_push, d_push,
d_pop, d_pop, d_pop, d_pop, d_pop, d_pop, d_pop, d_pop,
d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk,
d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk,
d_jo, d_jno, d_jb, d_jae, d_jz, d_jnz, d_jbe, d_ja,
d_js, d_jns, d_jpe, d_jpo, d_jl, d_jge, d_jle, d_jg,
d_gr80, d_gr80, d_gr80, d_gr80, d_test, d_test, d_xchg, d_xchg,
d_mov, d_mov, d_mov, d_mov, d_mov, d_lea, d_mov, d_pop,
d_nop, d_xchg, d_xchg, d_xchg, d_xchg, d_xchg, d_xchg, d_xchg,
d_cbw, d_cwd, d_call, d_wait, d_pushf, d_popf, d_sahf, d_lahf,
d_mov, d_mov, d_mov, d_mov, d_movsb, d_movsw, d_cmpsb, d_cmpsw,
d_test, d_test, d_stosb, d_stosw, d_lodsb, d_lodsw, d_scasb, d_scasw,
d_mov, d_mov, d_mov, d_mov, d_mov, d_mov, d_mov, d_mov,
d_mov, d_mov, d_mov, d_mov, d_mov, d_mov, d_mov, d_mov,
d_unk, d_unk, d_retn, d_retn, d_les, d_lds, d_mov, d_mov,
d_unk, d_unk, d_retf, d_retf, d_int3, d_int, d_into, d_iret,
d_grd0, d_grd0, d_grd0, d_grd0, d_aam, d_aad, d_unk, d_xlat,
d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk, d_unk,
d_loopnz, d_loopz, d_loop, d_jcxz, d_in, d_in, d_out, d_out,
d_call, d_jmp, d_jmp, d_jmp, d_in, d_in, d_out, d_out,
d_lock, d_unk, d_rep, d_rep, d_hlt, d_cmc, d_grf6, d_grf6,
d_clc, d_stc, d_cli, d_sti, d_cld, d_std, d_grfe, d_grff
};
static int vasprintf(char** strp, const char* fmt, va_list ap)
{
va_list ap_copy;
int formattedLength, actualLength;
size_t requiredSize;
// be paranoid
*strp = NULL;
// copy va_list, as it is used twice
va_copy(ap_copy, ap);
// compute length of formatted string, without NULL terminator
formattedLength = _vscprintf(fmt, ap_copy);
va_end(ap_copy);
// bail out on error
if (formattedLength < 0)
{
return -1;
}
// allocate buffer, with NULL terminator
requiredSize = ((size_t)formattedLength) + 1;
*strp = (char*)malloc(requiredSize);
// bail out on failed memory allocation
if (*strp == NULL)
{
errno = ENOMEM;
return -1;
}
// write formatted string to buffer, use security hardened _s function
actualLength = vsnprintf_s(*strp, requiredSize, requiredSize - 1, fmt, ap);
// again, be paranoid
if (actualLength != formattedLength)
{
free(*strp);
*strp = NULL;
errno = 131; //EOTHER
return -1;
}
return formattedLength;
}
static int asprintf(char** strp, const char* fmt, ...)
{
int result;
va_list ap;
va_start(ap, fmt);
result = vasprintf(strp, fmt, ap);
va_end(ap);
return result;
}
static char* concatf(const char* fmt, ...) {
va_list args;
char* buf = NULL;
va_start(args, fmt);
int n = vasprintf(&buf, fmt, args);
va_end(args);
if (n < 0) { free(buf); buf = NULL; }
return buf;
}
typedef struct { bool isWord; BYTE word; } WW;
WW def = {.isWord = false, .word = 0};
/*
* ifWord == {false, 0} by default
*/
char* _chooseSet(int MOD, int R_M, int W, BYTE ifByte, WW ifWord) {
WORD num;
if (ifWord.isWord)
num = (ifWord.word * 0x100 + ifByte);
else num = ifByte;
bool flagM = false;
if (ifWord.isWord == false && num > 0x7F) {
flagM = true;
num = ~num;
num = num % 0x80;
num = num + 1;
} else if (ifWord.isWord == true && num > 0x7FFF) {
flagM = true;
num = ~num + 1;
}
char* dest;
switch (MOD) {
case 0b00:
switch (R_M) {
case 0b000:
W ? (dest = "word ptr[BX + SI]") : (dest = "byte ptr[BX + SI]");
return dest;
case 0b001:
W ? (dest = "word ptr[BX + DI]") : (dest = "byte ptr[BX + DI]");
return dest;
case 0b010:
W ? (dest = "word ptr[BP + SI]") : (dest = "byte ptr[BP + SI]");
return dest;
case 0b011:
W ? (dest = "word ptr[BP + DI]") : (dest = "byte ptr[BP + DI]");
return dest;
case 0b100:
W ? (dest = "word ptr[SI]") : (dest = "byte ptr[SI]");
return dest;
case 0b101:
W ? (dest = "word ptr[DI]") : (dest = "byte ptr[DI]");
return dest;
case 0b110:
if (flagM)
{
dest = concatf("-%dh", num);
}
dest = concatf("%dh", num); // D16
return dest;
case 0b111:
W ? (dest = "word ptr[BX]") : (dest = "byte ptr[BX]");
return dest;
default:
exit(-100);
}
break; // 0b00
case 0b01:
switch (R_M) {
case 0b000:
if (flagM)
W ? (dest = concatf("word ptr[BX + SI - %dh]", num)) : (dest = concatf("byte ptr[BX + SI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BX + SI + %dh]", num)) : (dest = concatf("byte ptr[BX + SI + %dh]", num)); // D8
return dest;
case 0b001:
if (flagM)
W ? (dest = concatf("word ptr[BX + DI - %dh]", num)) : (dest = concatf("byte ptr[BX + DI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BX + DI + %dh]", num)) : (dest = concatf("byte ptr[BX + DI + %dh]", num)); // D8
return dest;
case 0b010:
if (flagM)
W ? (dest = concatf("word ptr[BP + SI - %dh]", num)) : (dest = concatf("byte ptr[BP + SI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BP + SI + %dh]", num)) : (dest = concatf("byte ptr[BP + SI + %dh]", num)); // D8
return dest;
case 0b011:
if (flagM)
W ? (dest = concatf("word ptr[BP + DI - %dh]", num)) : (dest = concatf("byte ptr[BP + DI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BP + DI + %dh]", num)) : (dest = concatf("byte ptr[BP + DI + %dh]", num)); // D8
return dest;
case 0b100:
if (flagM)
W ? (dest = concatf("word ptr[SI - %dh]", num)) : (dest = concatf("byte ptr[SI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[SI + %dh]", num)) : (dest = concatf("byte ptr[SI + %dh]", num)); // D8
return dest;
case 0b101:
if (flagM)
W ? (dest = concatf("word ptr[DI - %dh]", num)) : (dest = concatf("byte ptr[DI - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[DI + %dh]", num)) : (dest = concatf("byte ptr[DI + %dh]", num)); // D8
return dest;
case 0b110:
if (flagM)
W ? (dest = concatf("word ptr[BP - %dh]", num)) : (dest = concatf("byte ptr[BP - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BP + %dh]", num)) : (dest = concatf("byte ptr[BP + %dh]", num)); // D8
return dest;
case 0b111:
if (flagM)
W ? (dest = concatf("word ptr[BX - %dh]", num)) : (dest = concatf("byte ptr[BX - %dh]", num)); // D8
else
W ? (dest = concatf("word ptr[BX + %dh]", num)) : (dest = concatf("byte ptr[BX + %dh]", num)); // D8
return dest;
default:
exit(-101);
}
break; // 0b01
case 0b10:
switch (R_M) {
case 0b000:
if (flagM)
W ? (dest = concatf("word ptr[BX + SI - %dh]", num)) : (dest = concatf("byte ptr[BX + SI - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[BX + SI + %dh]", num)) : (dest = concatf("byte ptr[BX + SI + %dh]", num)); // D16
return dest;
case 0b001:
if (flagM)
W ? (dest = concatf("word ptr[BX + SI - %dh]", num)) : (dest = concatf("byte ptr[BX + SI - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[BX + DI + %dh]", num)) : (dest = concatf("byte ptr[BX + DI + %dh]", num)); // D16
return dest;
case 0b010:
case 0b011:
if (flagM)
W ? (dest = concatf("word ptr[BP + SI - %dh]", num)) : (dest = concatf("byte ptr[BP + SI - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[BP + SI + %dh]", num)) : (dest = concatf("byte ptr[BP + SI + %dh]", num)); // D16
return dest;
case 0b100:
if (flagM)
W ? (dest = concatf("word ptr[SI - %dh]", num)) : (dest = concatf("byte ptr[SI - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[SI + %dh]", num)) : (dest = concatf("byte ptr[SI + %dh]", num)); // D16
return dest;
case 0b101:
if (flagM)
W ? (dest = concatf("word ptr[DI - %dh]", num)) : (dest = concatf("byte ptr[DI - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[DI + %dh]", num)) : (dest = concatf("byte ptr[DI + %dh]", num)); // D16
return dest;
case 0b110:
if (flagM)
W ? (dest = concatf("word ptr[BP - %dh]", num)) : (dest = concatf("byte ptr[BP - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[BP + %dh]", num)) : (dest = concatf("byte ptr[BP + %dh]", num)); // D16
return dest;
case 0b111:
if (flagM)
W ? (dest = concatf("word ptr[BX - %dh]", num)) : (dest = concatf("byte ptr[BX - %dh]", num)); // D16
else
W ? (dest = concatf("word ptr[BX + %dh]", num)) : (dest = concatf("byte ptr[BX + %dh]", num)); // D16
return dest;
default:
exit(-102);
}
break; // 0b10
case 0b11:
switch (R_M) {
case 0b000:
W ? (dest = "ax") : (dest = "al");
return dest;
case 0b001:
W ? (dest = "cx") : (dest = "cl");
return dest;
case 0b010:
W ? (dest = "dx") : (dest = "dl");
return dest;
case 0b011:
W ? (dest = "bx") : (dest = "bl");
return dest;
case 0b100:
W ? (dest = "sp") : (dest = "ah");
return dest;
case 0b101:
W ? (dest = "bp") : (dest = "ch");
return dest;
case 0b110:
W ? (dest = "si") : (dest = "dh");
return dest;
case 0b111:
W ? (dest = "di") : (dest = "dh");
return dest;
default:
exit(-103);
}
break; // 0b11
default:
exit(-104);
}
}
#define DEF_OR_ARG(value,...) value
#define chooseSet(MOD,R_M,W,num,...) _chooseSet(MOD,R_M,W,num, DEF_OR_ARG(__VA_ARGS__ __VA_OPT__(,) def))
char* chooseSegmentReg(int REG) {
switch (REG) {
case 0b00:
return "es";
case 0b01:
return "cs";
case 0b10:
return "ss";
case 0b11:
return "ds";
default:
exit(-400);
}
}
char* chooseBaseReg(int R_M) {
switch (R_M) {
case 0b000:
return "ax";
case 0b001:
return "cx";
case 0b010:
return "dx";
case 0b011:
return "bx";
case 0b100:
return "sp";
case 0b101:
return "bp";
case 0b110:
return "si";
case 0b111:
return "di";
default:
exit(-500);
}
}
char* get_reg(int REG, int W) {
switch (W) {
case 0:
switch (REG) {
case 0b000:
return "al";
case 0b001:
return "cl";
case 0b010:
return "dl";
case 0b011:
return "bl";
case 0b100:
return "ah";
case 0b101:
return "ch";
case 0b110:
return "dh";
case 0b111:
return "bh";
default:
exit(-200);
}
break; // byte
case 1:
switch (REG) {
case 0b000:
return "ax";
case 0b001:
return "cx";
case 0b010:
return "dx";
case 0b011:
return "bx";
case 0b100:
return "sp";
case 0b101:
return "bp";
case 0b110:
return "si";
case 0b111:
return "di";
default:
exit(-201);
}
break; // word
default:
exit(-202);
}
}
//
// функция вывода одной дизассемблиованной инструкции на экран
//
void PrintInstruction(MZHeaders* mz, DWORD pos, DWORD inst_len, char* inst) {
unsigned int i;
printf("%04X:%04X ", mz->doshead->e_cs + (SIZE_OF_SEG_P * (pos / SIZE_OF_SEG_B)) + 0x1000, pos % SIZE_OF_SEG_B);
for (i = 0; i < inst_len; i++) {
printf("%02X", (mz->code + pos)[i]);
}
for (i = inst_len; i < INSTRUCTION_LEN; i++) {
printf(" ");
}
printf(" %s\n", inst);
}
DWORD g_pos = 0, g_inst_len;
//
// функция дизассембли ования сегмента кода
//
void DisasCodeSeg(MZHeaders* mz) {
DWORD pos = 0, inst_len;
char inst[256];
printf("Disassembled code segment\n");
ApplyRelocs(mz, IMAGE_BASE_SEG);
while (pos < mz->code_size) {
inst_len = opcodes[*(mz->code + pos)](mz, pos, inst);
PrintInstruction(mz, pos, inst_len, inst);
pos += inst_len;
g_pos = pos;
g_inst_len = inst_len;
}
RemoveRelocs(mz, IMAGE_BASE_SEG);
}
//
// функции обработки команд
//
DWORD d_aaa(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "aaa");
return 1;
}
DWORD d_aad(MZHeaders* mz, DWORD pos, char* inst) {
if (*(mz->code + pos + 1) == 10) {
strcpy(inst, "aad");
} else {
sprintf(inst, "aad %u", *(mz->code + pos + 1));
}
return 2;
}
DWORD d_aam(MZHeaders* mz, DWORD pos, char* inst) {
if (*(mz->code + pos + 1) == 10) {
strcpy(inst, "aam");
} else {
sprintf(inst, "aam %u", *(mz->code + pos + 1));
}
return 2;
}
DWORD d_aas(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "aas");
return 1;
}
DWORD d_adc(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc) {
case 0x10:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
sprintf(inst, "adc %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x11:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
sprintf(inst, "adc %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x12:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("byte ptr[%s]", dest);
sprintf(inst, "adc %s, %s", reg, dest);
if (MOD != 0b11) return 4; else return 2;
case 0x13:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("word ptr[%s]", dest);
sprintf(inst, "adc %s, %s", reg, dest);
if (MOD == 0) return 4; else return 2;
case 0x14:
result = num2;
sprintf(inst, "adc al, %2Xh", result);
return 2;
case 0x15:
result = num1 * 0x100 + num2;
sprintf(inst, "adc ax, %4Xh", result);
return 3;
case 0x80:
//D_S ? dest : (dest = concatf("byte ptr[%s]", dest), num2 = mz->code+pos+3);
if (MOD != 0b11) {
dest = concatf("byte ptr[%s]", dest);
num1 = *(mz->code + pos + 4);
}
sprintf(inst, "adc %s, %2Xh", dest, num1);
if (MOD != 0b11) return 5; else return 3;
case 0x81:
//D_S ? dest : (dest = concatf("word ptr[%s]", dest), num2 = mz->code + pos + 3, num1 = mz->code+pos+4);
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
num1 = *(mz->code + pos + 5);
} else {
num2 = *(mz->code + pos + 2);
num1 = *(mz->code + pos + 3);
}
result = num1 * 0x100 + num2;
sprintf(inst, "adc %s, %4Xh", dest, result);
if (MOD != 0b11) return 6; else return 4;
case 0x83:
//D_S ? dest : (dest = concatf("word ptr[%s]", dest), num2 = mz->code + pos + 3);
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
} else {
num2 = *(mz->code + pos + 2);
}
sprintf(inst, "adc %s, %2Xh", dest, num2);
if (MOD != 0b11) return 5; else return 3;
default:
break;
}
return 1;
}
DWORD d_add(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc) {
case 0x00:
//D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
sprintf(inst, "add %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x01:
//D_S ? dest : (dest = concatf("word ptr[%s]", dest));
sprintf(inst, "add %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x02:
//D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("byte ptr[%s]", dest);
sprintf(inst, "add %s, %s", reg, dest);
if (MOD != 0b11) return 4; else return 2;
case 0x03:
//D_S ? dest : (dest = concatf("word ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("word ptr[%s]", dest);
sprintf(inst, "add %s, %s", reg, dest);
if (MOD == 0) return 4; else return 2;
case 0x04:
result = num2;
sprintf(inst, "add al, %2Xh", result);
return 2;
case 0x05:
result = num1 * 0x100 + num2;
sprintf(inst, "add ax, %4Xh", result);
return 3;
case 0x80:
if (MOD != 0b11) {
dest = concatf("byte ptr[%s]", dest);
num1 = *(mz->code + pos + 4);
}
sprintf(inst, "add %s, %2Xh", dest, num1);
if (MOD != 0b11) return 5; else return 3;
case 0x81:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
num1 = *(mz->code + pos + 5);
} else {
num2 = *(mz->code + pos + 2);
num1 = *(mz->code + pos + 3);
}
result = num1 * 0x100 + num2;
sprintf(inst, "add %s, %4Xh", dest, result);
if (MOD != 0b11) return 6; else return 4;
case 0x83:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
} else {
num2 = *(mz->code + pos + 2);
}
sprintf(inst, "add %s, %2Xh", dest, num2);
if (MOD != 0b11) return 5; else return 3;
default:
break;
}
return 1;
}
DWORD d_and(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc) {
case 0x20:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
sprintf(inst, "adc %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x21:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
sprintf(inst, "adc %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x22:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("byte ptr[%s]", dest);
sprintf(inst, "adc %s, %s", reg, dest);
if (MOD != 0b11) return 4; else return 2;
case 0x23:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("word ptr[%s]", dest);
sprintf(inst, "adc %s, %s", reg, dest);
if (MOD == 0) return 4; else return 2;
case 0x24:
result = num2;
sprintf(inst, "adc al, %2Xh", result);
return 2;
case 0x25:
result = num1 * 0x100 + num2;
sprintf(inst, "adc ax, %4Xh", result);
return 3;
case 0x80:
if (MOD != 0b11) {
dest = concatf("byte ptr[%s]", dest);
num1 = *(mz->code + pos + 4);
}
sprintf(inst, "adc %s, %2Xh", dest, num1);
if (MOD != 0b11) return 5; else return 3;
case 0x81:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
num1 = *(mz->code + pos + 5);
} else {
num2 = *(mz->code + pos + 2);
num1 = *(mz->code + pos + 3);
}
result = num1 * 0x100 + num2;
sprintf(inst, "adc %s, %4Xh", dest, result);
if (MOD != 0b11) return 6; else return 4;
case 0x83:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
} else {
num2 = *(mz->code + pos + 2);
}
sprintf(inst, "adc %s, %2Xh", dest, num2);
if (MOD != 0b11) return 5; else return 3;
default:
break;
}
return 1;
}
DWORD d_call(MZHeaders* mz, DWORD pos, char* inst) {
BYTE opc = *(mz->code + pos);
WORD tmp = 0, result = 0;
WORD offs1 = *(mz->code + pos + 2),
offs2 = *(mz->code + pos + 1);
switch (opc)
{
case 0xE8:
offs1 = offs1 * 0x100 + offs2;
result = (g_pos + 3) + offs1;
tmp = mz->doshead->e_cs + 0x1000;
sprintf(inst, "call %X:%04X", tmp, result);
return 3;
case 0xFF:
offs1 = *(mz->code + pos + 3);
offs2 = *(mz->code + pos + 2);
tmp = offs1 * 0x100 + offs2;
sprintf(inst, "call dword ptr[%X]", result, tmp);
return 4;
case 0x9A:
offs1 = *(mz->code + pos + 4);
offs2 = *(mz->code + pos + 3);
result = offs1 * 0x100 + offs2;
offs1 = *(mz->code + pos + 2);
offs2 = *(mz->code + pos + 1);
tmp = offs1 * 0x100 + offs2;
sprintf(inst, "call far ptr %X:%X", result, tmp);
return 5;
default:
exit(-100000);
}
}
DWORD d_cbw(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cbw");
return 1;
}
DWORD d_clc(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "clc");
return 1;
}
DWORD d_cld(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cld");
return 1;
}
DWORD d_cli(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cli");
return 1;
}
DWORD d_cmc(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cmc");
return 1;
}
DWORD d_cmp(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc) {
case 0x38:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
sprintf(inst, "cmp %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x39:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
sprintf(inst, "cmp %s, %s", dest, reg);
if (D_S == 0) return 4; else return 2;
case 0x3A:
D_S ? dest : (dest = concatf("byte ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("byte ptr[%s]", dest);
sprintf(inst, "cmp %s, %s", reg, dest);
if (MOD != 0b11) return 4; else return 2;
case 0x3B:
D_S ? dest : (dest = concatf("word ptr[%s]", dest));
if (MOD != 0b11) dest = concatf("word ptr[%s]", dest);
sprintf(inst, "cmp %s, %s", reg, dest);
if (MOD == 0) return 4; else return 2;
case 0x3C:
result = num2;
sprintf(inst, "cmp al, %2Xh", result);
return 2;
case 0x3D:
result = num1 * 0x100 + num2;
sprintf(inst, "cmp ax, %4Xh", result);
return 3;
case 0x80:
if (MOD != 0b11) {
dest = concatf("byte ptr[%s]", dest);
num1 = *(mz->code + pos + 4);
}
sprintf(inst, "cmp %s, %2Xh", dest, num1);
if (MOD != 0b11) return 5; else return 3;
case 0x81:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
num1 = *(mz->code + pos + 5);
} else {
num2 = *(mz->code + pos + 2);
num1 = *(mz->code + pos + 3);
}
result = num1 * 0x100 + num2;
sprintf(inst, "cmp %s, %4Xh", dest, result);
if (MOD != 0b11) return 6; else return 4;
case 0x83:
if (MOD != 0b11) {
dest = concatf("word ptr[%s]", dest);
num2 = *(mz->code + pos + 4);
} else {
num2 = *(mz->code + pos + 2);
}
sprintf(inst, "cmp %s, %2Xh", dest, num2);
if (MOD != 0b11) return 5; else return 3;
default:
break;
}
return 1;
}
DWORD d_cmpsb(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cmpsb");
return 1;
}
DWORD d_cmpsw(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cmpsw");
return 1;
}
DWORD d_cwd(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "cwd");
return 1;
}
DWORD d_daa(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "das");
return 1;
}
DWORD d_das(MZHeaders* mz, DWORD pos, char* inst) {
strcpy(inst, "das");
return 1;
}
DWORD d_dec(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc) {
case 0x48:
strcpy(inst, "dec ax");
return 2;
case 0x49:
strcpy(inst, "dec cx");
return 2;
case 0x4A:
strcpy(inst, "dec dx");
return 2;
case 0x4B:
strcpy(inst, "dec bx");
return 2;
case 0x4C:
strcpy(inst, "dec sp");
return 2;
case 0x4D:
strcpy(inst, "dec bp");
return 2;
case 0x4E:
strcpy(inst, "dec si");
return 2;
case 0x4F:
strcpy(inst, "dec di");
return 2;
case 0xFE:
result = num1 * 0x100 + num2;
sprintf(inst, "dec byte ptr[%04Xh]", result);
return 4;
case 0xFF:
result = num1 * 0x100 + num2;
sprintf(inst, "dec word ptr[%04Xh]", result);
return 4;
default:
exit(-1900);
}
}
DWORD d_div(MZHeaders* mz, DWORD pos, char* inst) {
GET_VARS
switch (opc)