qemu multibyte noops

Index: target-i386/translate.c
===================================================================
RCS file: /cvsroot/qemu/qemu/target-i386/translate.c,v
retrieving revision 1.59
diff -u -r1.59 translate.c
--- target-i386/translate.c	10 Jul 2006 19:53:04 -0000	1.59
+++ target-i386/translate.c	18 Aug 2006 22:59:56 -0000
@@ -5795,6 +5795,78 @@
             goto illegal_op;
         }
         break;
+#if 1
+    case 0x119 ... 0x11e:
+        /* noop */
+        printf("reserved %04X %s\n", b, (prefixes & PREFIX_DATA) ? ": 0x66" : "");
+        goto illegal_op;
+        break;
+    case 0x11f:
+        {
+            /* multi-byte noop */
+            /* NOOP patterns */
+            /*
+             * 3 1    0F 1F 00
+             * 4 2    0F 1F 40 00
+             * 5 2    0F 1F 44 00 00
+             * 6 2 66 0F 1F 44 00 00
+             * 7 4    0F 1F 80 00 00 00 00
+             * 8 5    0F 1F 84 00 00 00 00 00
+             * 9 5 66 0F 1F 84 00 00 00 00 00
+             */
+            int noop_displ = 0;
+
+            modrm = ldub_code(s->pc++);
+            rm  = modrm & 7;
+            mod = (modrm >> 6) & 3;
+            reg = (modrm >> 3) & 7;
+
+            printf("+++ multibyte nop %04X %04X %04X\n", mod, reg, rm);
+
+            if (reg != 0)
+            {
+                printf("multibyte nop %04X %s illegal reg %d\n", b, (prefixes & PREFIX_DATA) ? ": 0x66" : "", reg);
+                goto illegal_op;
+            }
+
+            if (rm == 0x04)
+            {
+                /* 8bit SIB follows */
+                noop_displ += 1;
+            }
+
+            switch (mod)
+            {
+                case 0x00:
+                    if (rm == 0x05)
+                    {
+                        /* 32bit data follows */
+                        noop_displ += 4;
+                    }
+                    /* else register is specified */
+                    break;
+                case 0x01:
+                    /* 8bit data follows */
+                    noop_displ += 1;
+                    break;
+                case 0x10:
+                    /* 32bit data follows */
+                    noop_displ += 4;
+                    break;
+                case 0x11:
+                default:
+                    /* register is specified */
+                    break;
+            }
+
+            printf("nop %04X %s + %d-byte IM\n", b, (prefixes & PREFIX_DATA) ? ": 0x66" : "", noop_displ);
+
+            /* skip the remainder */
+            s->pc += noop_displ;
+        }
+        break;
+#endif
+
     case 0x120: /* mov reg, crN */
     case 0x122: /* mov crN, reg */
         if (s->cpl != 0) {