From: Julian Seward <jseward@acm.org>
Date: Sat, 8 Jan 2005 18:25:05 +0000 (+0000)
Subject: Observe the memory fencing properties of CPUID.
X-Git-Tag: svn/VALGRIND_3_0_1^2~632
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=dd57f1a169ead3bee1931ff864c19bacd8b46695;p=thirdparty%2Fvalgrind.git

Observe the memory fencing properties of CPUID.


git-svn-id: svn://svn.valgrind.org/vex/trunk@702
---

diff --git a/VEX/priv/guest-x86/toIR.c b/VEX/priv/guest-x86/toIR.c
index ad4c550076..98cf4039f8 100644
--- a/VEX/priv/guest-x86/toIR.c
+++ b/VEX/priv/guest-x86/toIR.c
@@ -11535,6 +11535,9 @@ DisResult disInstr ( /*IN*/  Bool       resteerOK,
          d->fxState[3].size   = 4;
          /* execute the dirty call, side-effecting guest state */
          stmt( IRStmt_Dirty(d) );
+         /* CPUID is a serialising insn.  So, just in case someone is
+            using it as a memory fence ... */
+         stmt( IRStmt_MFence() );
          DIP("cpuid\n");
          break;
       }