void do_sib(int m)
{
int s, i, b;
s = ss(sib());
i = indx(sib());
b = base(sib());
switch (b)
{
case 0: expand_out("%p:[EAX"); break;
case 1: expand_out("%p:[ECX"); break;
case 2: expand_out("%p:[EDX"); break;
case 3: expand_out("%p:[EBX"); break;
case 4: expand_out("%p:[ESP"); break;
case 5:
if (m == 0)
{
expand_out("%p:[");
ohex('d', 4, 0, addrsize);
}
else
expand_out("%p:[EBP");
break;
case 6: expand_out("%p:[ESI"); break;
case 7: expand_out("%p:[EDI"); break;
}
switch (i)
{
case 0: fprintf(out_fh,"+EAX"); break;
case 1: fprintf(out_fh,"+ECX"); break;
case 2: fprintf(out_fh,"+EDX"); break;
case 3: fprintf(out_fh,"+EBX"); break;
case 4: break;
case 5: fprintf(out_fh,"+EBP"); break;
case 6: fprintf(out_fh,"+ESI"); break;
case 7: fprintf(out_fh,"+EDI"); break;
}
if (i != 4)
switch (s)
{
case 0: break;
case 1: fprintf(out_fh,"*2"); break;
case 2: fprintf(out_fh,"*4"); break;
case 3: fprintf(out_fh,"*8"); break;
}
}
void do_sib(int m)
{
int s, i, b;
s = ss(sib());
i = indx(sib());
b = base(sib());
switch (b)
{
case 0: ua_str("%p:[eax"); break;
case 1: ua_str("%p:[ecx"); break;
case 2: ua_str("%p:[edx"); break;
case 3: ua_str("%p:[ebx"); break;
case 4: ua_str("%p:[esp"); break;
case 5:
if (m == 0)
{
ua_str("%p:[");
ohex('d', 4, 0, addrsize);
}
else
ua_str("%p:[ebp");
break;
case 6: ua_str("%p:[esi"); break;
case 7: ua_str("%p:[edi"); break;
}
switch (i)
{
case 0: uprintf("+eax"); break;
case 1: uprintf("+ecx"); break;
case 2: uprintf("+edx"); break;
case 3: uprintf("+ebx"); break;
case 4: break;
case 5: uprintf("+ebp"); break;
case 6: uprintf("+esi"); break;
case 7: uprintf("+edi"); break;
}
if (i != 4)
switch (s)
{
case 0: uprintf(""); break;
case 1: uprintf("*2"); break;
case 2: uprintf("*4"); break;
case 3: uprintf("*8"); break;
}
}
static void percent(char c, char t)
{
word32 vofs;
long l;
int extend = (addrsize == 32) ? 4 : 2;
switch (c)
{
case 'A':
ohex(t, extend, 0, addrsize);
break;
case 'C':
uprintf("C%d", reg(modrm()));
break;
case 'D':
uprintf("D%d", reg(modrm()));
break;
case 'E':
do_modrm(t);
break;
case 'G':
if (t == 'F')
reg_name(rm(modrm()), t);
else
reg_name(reg(modrm()), t);
break;
case 'I':
ohex(t, 0, 0, opsize);
break;
case 'J':
switch (bytes(t))
{
case 1:
vofs = (int8)getbyte();
break;
case 2:
vofs = getbyte();
vofs += getbyte()<<8;
vofs = (int16)vofs;
break;
case 4:
vofs = (word32)getbyte();
vofs |= (word32)getbyte() << 8;
vofs |= (word32)getbyte() << 16;
vofs |= (word32)getbyte() << 24;
break;
}
l=vofs+codeoff;
if(l<0x10000L)
uprintf("%s%04lx%s %c", hex1, l, hex2,
(vofs & 0x80000000L) ? 0x18 : 0x19);
else
uprintf("%s%08lX%s %c", hex1, l, hex2,
(vofs & 0x80000000L) ? 0x18 : 0x19);
break;
case 'M':
do_modrm(t);
break;
case 'O':
ua_str("%p:[");
ohex(t, extend, 0, addrsize);
uprintf("%c",']');
break;
case 'R':
reg_name(reg(modrm()), t);
//do_modrm(t);
break;
case 'S':
uprintf("%c","ecsdfg"[reg(modrm())]);
uprintf("%c",'s');
break;
case 'T':
uprintf("tr%d", reg(modrm()));
break;
case 'X':
uprintf("ds:[");
if (addrsize == 32)
uprintf("%c",'e');
uprintf("si]");
break;
case 'Y':
uprintf("es:[");
if (addrsize == 32)
uprintf("%c",'e');
uprintf("di]");
break;
case '2':
ua_str(second[getbyte()]);
break;
case 'e':
if (opsize == 32)
{
if (t == 'w')
uprintf("%c",'d');
else
{
uprintf("%c",'e');
uprintf("%c",t);
}
}
else
uprintf("%c",t);
break;
case 'f':
floating_point(t-'0');
break;
case 'g':
ua_str(groups[t-'0'][reg(modrm())]);
break;
case 'p':
switch (t)
{
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 's':
prefix = t;
ua_str(opmap1[getbyte()]);
break;
case ':':
if (prefix)
uprintf("%cs:", prefix);
break;
case ' ':
ua_str(opmap1[getbyte()]);
break;
}
break;
case 's':
switch (t)
{
case 'a':
addrsize = 48 - addrsize;
ua_str(opmap1[getbyte()]);
break;
case 'o':
opsize = 48 - opsize;
ua_str(opmap1[getbyte()]);
break;
}
break;
}
}
void do_modrm(char t)
{
int m = mod(modrm());
int r = rm(modrm());
int extend = (addrsize == 32) ? 4 : 2;
if (m == 3)
{
reg_name(r, t);
return;
}
switch(bytes(t))
{
case 1 : ua_str("byte ptr "); break;
case 2 : ua_str("word ptr "); break;
case 4 : ua_str("dword ptr "); break;
default : ua_str("?word ptr "); break;
}
if ((m == 0) && (r == 5) && (addrsize == 32))
{
ua_str("%p:[");
ohex('d', extend, 0, addrsize);
uprintf("%c",']');
return;
}
if ((m == 0) && (r == 6) && (addrsize == 16))
{
ua_str("%p:[");
ohex('w', extend, 0, addrsize);
uprintf("%c",']');
return;
}
if ((addrsize != 32) || (r != 4))
ua_str("%p:[");
if (addrsize == 16)
{
switch (r)
{
case 0: uprintf("bx+si"); break;
case 1: uprintf("bx+di"); break;
case 2: uprintf("bp+si"); break;
case 3: uprintf("bp+di"); break;
case 4: uprintf("si"); break;
case 5: uprintf("di"); break;
case 6: uprintf("bp"); break;
case 7: uprintf("bx"); break;
}
}
else
{
switch (r)
{
case 0: uprintf("eax"); break;
case 1: uprintf("ecx"); break;
case 2: uprintf("edx"); break;
case 3: uprintf("ebx"); break;
case 4: do_sib(m); break;
case 5: uprintf("ebp"); break;
case 6: uprintf("esi"); break;
case 7: uprintf("edi"); break;
}
}
switch (m)
{
case 1:
ohex('b', extend, 1, addrsize);
break;
case 2:
uprintf("+");
ohex('v', extend, 1, addrsize);
break;
}
uprintf("%c",']');
}
/*------------------------------------------------------------------------*/
void do_modrm(char t)
{
int m;
int r;
int extend;
m = mod(modrm());
r = rm(modrm());
extend = (addrsize == 32) ? 4 : 2;
if (m == 3)
{
reg_name(r, t);
return;
}
if ((m == 0) && (r == 5) && (addrsize == 32))
{
expand_out("%p:[");
ohex('d', extend, 0, addrsize);
fprintf(out_fh,"]");
return;
}
if ((m == 0) && (r == 6) && (addrsize == 16))
{
expand_out("%p:[");
ohex('w', extend, 0, addrsize);
fprintf(out_fh,"]");
return;
}
if ((addrsize != 32) || (r != 4))
expand_out("%p:[");
if (addrsize == 16)
{
switch (r)
{
case 0: fprintf(out_fh,"BX+SI"); break;
case 1: fprintf(out_fh,"BX+DI"); break;
case 2: fprintf(out_fh,"BP+SI"); break;
case 3: fprintf(out_fh,"BP+DI"); break;
case 4: fprintf(out_fh,"SI"); break;
case 5: fprintf(out_fh,"DI"); break;
case 6: fprintf(out_fh,"BP"); break;
case 7: fprintf(out_fh,"BX"); break;
}
}
else
{
switch (r)
{
case 0: fprintf(out_fh,"EAX"); break;
case 1: fprintf(out_fh,"ECX"); break;
case 2: fprintf(out_fh,"EDX"); break;
case 3: fprintf(out_fh,"EBX"); break;
case 4: do_sib(m); break;
case 5: fprintf(out_fh,"EBP"); break;
case 6: fprintf(out_fh,"ESI"); break;
case 7: fprintf(out_fh,"EDI"); break;
}
}
switch (m)
{
case 1:
ohex('b', extend, 0, addrsize); /* was 1 */
break;
case 2:
fprintf(out_fh,"+");
ohex('v', extend, 0, addrsize); /* was 1 */
break;
}
fprintf(out_fh,"]");
}
void escape(char c, char t)
{
U32 v;
S32 delta, vofs, tmp;
S8 vofsb;
S16 vofsw;
char *name;
int extend;
U8 b2, w;
extend = (addrsize == 32) ? 4 : 2;
switch (c)
{
case 'A': /* Direct Address */
ohex(t, extend, 0, addrsize);
break;
case 'C': /* Reg of R/M picks control reg */
fprintf(out_fh, "CR%d",reg(modrm()));
break;
case 'D': /* Reg of R/M pick debug reg */
fprintf(out_fh, "DR%d",modrm());
break;
case 'E': /* R/M picks operand */
do_modrm(t);
break;
case 'G': /* Reg of R/M picks general reg */
if (t == 'F')
reg_name(rm(modrm()), t);
else
reg_name(reg(modrm()), t);
break;
case 'I': /* Immediate data */
ohex(t, 0, 0, opsize);
break;
case 'J': /* Relative IP offset */
switch (bytes(t))
{
case 1:
vofsb = getbyte(); /* must remian signed! */
vofs = vofsb;
break;
case 2:
vofsb = getbyte(); /*Must be Signed bytes/Words */
vofsw = getbyte()<<8;
vofs = vofsw + vofsb;
break;
case 4:
vofs = getbyte();
tmp = getbyte();
vofs |= tmp << 8;
tmp = getbyte();
vofs |= tmp << 16;
tmp = getbyte();
vofs |= tmp << 24;
break;
}
delta = addrIn + vofs;
fprintf(out_fh, "%08lX", delta);
break;
case 'M': /* R/M picks memory */
do_modrm(t);
break;
case 'O': /* NO R/M, Offset only */
expand_out("%p:[");
ohex(t, extend, 0, addrsize);
fprintf(out_fh,"]");
break;
case 'R': /* Mod of R/M pick REG only */
do_modrm(t);
break;
case 'S': /* Reg of R/M picks seg reg */
fprintf(out_fh, "%s", seg_names[reg(modrm())]);
break;
case 'T': /* Reg of R/M picks test reg */
fprintf(out_fh, "TR%d",modrm());
break;
case 'X': /* DS:ESI */
fprintf(out_fh,"DS:[");
if (addrsize == 32)
fprintf(out_fh,"E");
fprintf(out_fh,"SI]");
break;
case 'Y': /* ES:EDI */
fprintf(out_fh,"ES:[");
if (addrsize == 32)
fprintf(out_fh,"E");
fprintf(out_fh,"DI]");
break;
case '2': /* Prefix of 2 byte opcode */
b2 = getbyte();
if (b2 < 0x10)
expand_out(SecOp00[b2]);
else if ((b2 > 0x1F) && (b2 < 0x30))
expand_out(SecOp20[b2-0x20]);
else if ((b2 > 0x7F) && (b2 < 0xC0))
expand_out(SecOp80[b2-0x80]);
else
fprintf(out_fh, "<invalid>");
break;
case 'e': /* If "USE32" t is part of reg name */
if (opsize == 32)
{
if (t == 'w') /* put out "d" if t is "w" on USE32 segs*/
fprintf(out_fh,"D");
else
{
fprintf(out_fh,"E"); /* put out "E" if not t <> "w" then put t */
fputc(t, out_fh);
}
}
else {
fputc(t, out_fh); /* when USE16 just put out esc char */
}
break;
case 'f': /* floating point */
fprintf(out_fh,"<Float Op>");
/* floating_point(t-'0'); */
break;
case 'g': /* do R/M group 'n' */
expand_out(groups[t-'0'][reg(modrm())]);
break;
case 'p': /* Segment prefix */
switch (t)
{
case 'C': /* CS */
case 'D': /* DS */
case 'E': /* ES */
case 'F': /* FS */
case 'G': /* GS */
case 'S': /* SS */
prefix = t;
expand_out(opmap1[getbyte()]);
break;
case ':':
if (prefix) {
fputc(prefix, out_fh);
fprintf(out_fh,"S:");
}
break;
case ' ':
expand_out(opmap1[getbyte()]);
break;
}
break;
case 's': /* Size override */
switch (t)
{
case 'a':
addrsize = 48 - addrsize; /* a is address */
expand_out(opmap1[getbyte()]);
break;
case 'o': /* o is operand */
opsize = 48 - opsize;
expand_out(opmap1[getbyte()]);
break;
}
break;
}
}
