Changeset 21186 in vbox for trunk/src/recompiler

Timestamp:

Jul 3, 2009 9:48:09 AM (16 years ago)

Author:

vboxsync

Message:

recompiler: Fixed mov to/from CRx/DRx decoding to match reality (mod bits must be ignored).

File:

• trunk/src/recompiler/target-i386/translate.c (modified) (2 diffs)

trunk/src/recompiler/target-i386/translate.c

@@ -8079 +8079 @@
         } else {
             modrm = ldub_code(s->pc++);
+#ifndef VBOX    /* mod bits are always understood to be 11 (0xc0) regardless of actual content; see AMD manuals */
             if ((modrm & 0xc0) != 0xc0)
                 goto illegal_op;
+#endif
             rm = (modrm & 7) | REX_B(s);
             reg = ((modrm >> 3) & 7) | rex_r;
@@ -8119 +8121 @@
         } else {
             modrm = ldub_code(s->pc++);
+#ifndef VBOX    /* mod bits are always understood to be 11 (0xc0) regardless of actual content; see AMD manuals */
             if ((modrm & 0xc0) != 0xc0)
                 goto illegal_op;
+#endif
             rm = (modrm & 7) | REX_B(s);
             reg = ((modrm >> 3) & 7) | rex_r;