From: Julian Seward <jseward@acm.org>
Date: Sat, 8 Nov 2008 15:25:00 +0000 (+0000)
Subject: Support "repe scas" on amd64.  Fixes #168943.
X-Git-Tag: svn/VALGRIND_3_4_1^2~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69d8c756bf84aadb31f463b1db7ccb846e7f1cb2;p=thirdparty%2Fvalgrind.git

Support "repe scas" on amd64.  Fixes #168943.


git-svn-id: svn://svn.valgrind.org/vex/trunk@1872
---

diff --git a/VEX/priv/guest-amd64/toIR.c b/VEX/priv/guest-amd64/toIR.c
index 68066c8c3e..cef973bb57 100644
--- a/VEX/priv/guest-amd64/toIR.c
+++ b/VEX/priv/guest-amd64/toIR.c
@@ -14717,6 +14717,18 @@ DisResult disInstr_AMD64_WRK (
          dres.whatNext = Dis_StopHere;
          break;
       }
+      /* F3 AE/AF: repe scasb/repe scas{w,l,q} */
+      if (haveASO(pfx)) 
+         goto decode_failure;
+      if (!haveF2(pfx) && haveF3(pfx)) {
+         if (opc == 0xAE)
+            sz = 1;
+         dis_REP_op ( AMD64CondZ, dis_SCAS, sz, 
+                      guest_RIP_curr_instr,
+                      guest_RIP_bbstart+delta, "repe scas", pfx );
+         dres.whatNext = Dis_StopHere;
+         break;
+      }
       /* AE/AF: scasb/scas{w,l,q} */
       if (!haveF2(pfx) && !haveF3(pfx)) {
          if (opc == 0xAE)