From 67d18be2a5bddbd8ee9ef144b34ccaeba08a1db2 Mon Sep 17 00:00:00 2001
From: Mark Mendell <mark.p.mendell@intel.com>
Date: Fri, 30 May 2014 15:05:09 -0400
Subject: Support disassembly of 16-bit immediates

Change-Id: I66f5ce93077241204311e52c547599f5287bae04
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>
---
 disassembler/disassembler_x86.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'disassembler/disassembler_x86.cc')

diff --git a/disassembler/disassembler_x86.cc b/disassembler/disassembler_x86.cc
index cba4ebf4e8..614eca1710 100644
--- a/disassembler/disassembler_x86.cc
+++ b/disassembler/disassembler_x86.cc
@@ -1040,8 +1040,13 @@ DISASSEMBLER_ENTRY(cmp,
       instr++;
     } else {
       CHECK_EQ(immediate_bytes, 4u);
-      args << StringPrintf("%d", *reinterpret_cast<const int32_t*>(instr));
-      instr += 4;
+      if (prefix[2] == 0x66) {  // Operand size override from 32-bit to 16-bit.
+        args << StringPrintf("%d", *reinterpret_cast<const int16_t*>(instr));
+        instr += 2;
+      } else {
+        args << StringPrintf("%d", *reinterpret_cast<const int32_t*>(instr));
+        instr += 4;
+      }
     }
   } else if (branch_bytes > 0) {
     DCHECK(!has_modrm);
-- 
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