From: Gabe Black <gblack@eecs.umich.edu>
Date: Thu, 2 Aug 2007 22:09:12 +0000 (-0700)
Subject: X86: Fix special case with SIB index register and REX prefix.
X-Git-Tag: m5_2.0_beta4~208
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=85b661e35d82cea3c5edd27f111cffbd4ee47f4b;p=gem5.git

X86: Fix special case with SIB index register and REX prefix.

--HG--
extra : convert_revision : b305708a722f2a08cb55c4548c5616fcbe6c5d68
---

diff --git a/src/arch/x86/emulenv.cc b/src/arch/x86/emulenv.cc
index 3a54d7365..28282dc7a 100644
--- a/src/arch/x86/emulenv.cc
+++ b/src/arch/x86/emulenv.cc
@@ -73,7 +73,7 @@ void EmulEnv::doModRM(const ExtMachInst & machInst)
         if (machInst.sib.base == INTREG_RBP && machInst.modRM.mod == 0)
             base = NUM_INTREGS;
         //In -this- special case, we don't use an index.
-        if (machInst.sib.index == INTREG_RSP)
+        if (index == INTREG_RSP)
             index = NUM_INTREGS;
     } else {
         if (machInst.addrSize == 2) {
@@ -82,11 +82,9 @@ void EmulEnv::doModRM(const ExtMachInst & machInst)
             scale = 0;
             base = machInst.modRM.rm | (machInst.rex.b << 3);
             if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) {
-                base = NUM_INTREGS;
                 //Since we need to use a different encoding of this
                 //instruction anyway, just ignore the base in those cases
-//                if (machInst.mode.submode == SixtyFourBitMode)
-//                    base = NUM_INTREGS+7;
+                base = NUM_INTREGS;
             }
         }
     }