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multi byte nop support

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2145 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-09-03 17:09:02 +00:00
parent 03c1847584
commit e17a36ce41
1 changed files with 57 additions and 2 deletions
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59
target-i386/translate.c
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@ -1615,6 +1615,56 @@ static void gen_lea_modrm(DisasContext *s, int modrm, int *reg_ptr, int *offset_
*offset_ptr = disp;
}
static void gen_nop_modrm(DisasContext *s, int modrm)
{
int mod, rm, base, code;
mod = (modrm >> 6) & 3;
if (mod == 3)
return;
rm = modrm & 7;
if (s->aflag) {
base = rm;
if (base == 4) {
code = ldub_code(s->pc++);
base = (code & 7);
}
switch (mod) {
case 0:
if (base == 5) {
s->pc += 4;
}
break;
case 1:
s->pc++;
break;
default:
case 2:
s->pc += 4;
break;
}
} else {
switch (mod) {
case 0:
if (rm == 6) {
s->pc += 2;
}
break;
case 1:
s->pc++;
break;
default:
case 2:
s->pc += 2;
break;
}
}
}
/* used for LEA and MOV AX, mem */
static void gen_add_A0_ds_seg(DisasContext *s)
{
@ -5791,10 +5841,15 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
gen_lea_modrm(s, modrm, &reg_addr, &offset_addr);
/* nothing more to do */
break;
default:
goto illegal_op;
default: /* nop (multi byte) */
gen_nop_modrm(s, modrm);
break;
}
break;
case 0x119 ... 0x11f: /* nop (multi byte) */
modrm = ldub_code(s->pc++);
gen_nop_modrm(s, modrm);
break;
case 0x120: /* mov reg, crN */
case 0x122: /* mov crN, reg */
if (s->cpl != 0) {