This patch adds handling of multi-byte NOPs, recent gcc/gas uses them for x86 code padding.
Patch checked with current opensuse-factory x86 guest installation which is built with new gcc/gas tools.
--
Kind Regards,
Igor V. Kovalenko
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 23:23:40 -0000
@@ -5795,6 +5795,49 @@
goto illegal_op;
}
break;
+ case 0x11f:
+ /* multi-byte noop */
+
+ modrm = ldub_code(s->pc++);
+ rm = modrm & 7;
+ mod = (modrm >> 6) & 3;
+ reg = (modrm >> 3) & 7;
+
+ if (reg != 0)
+ {
+ goto illegal_op;
+ }
+
+ if (rm == 0x04)
+ {
+ /* SIB byte follows */
+ s->pc += 1;
+ }
+
+ switch (mod)
+ {
+ case 0x00:
+ if (rm == 0x05)
+ {
+ /* 32bit data follows */
+ s->pc += 4;
+ }
+ /* else register is specified */
+ break;
+ case 0x01:
+ /* 8bit data follows */
+ s->pc += 1;
+ break;
+ case 0x10:
+ /* 32bit data follows */
+ s->pc += 4;
+ break;
+ case 0x11:
+ default:
+ /* register is specified */
+ break;
+ }
+ break;
case 0x120: /* mov reg, crN */
case 0x122: /* mov crN, reg */
if (s->cpl != 0) {
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