methods to set taint

4 files changed, 38 insertions, 0 deletions

diff --git a/src/cpu/base_dyn_inst.hh b/src/cpu/base_dyn_inst.hh
index 6301864b7..4d8014445 100644
--- a/src/cpu/base_dyn_inst.hh
+++ b/src/cpu/base_dyn_inst.hh
@@ -478,6 +478,13 @@ class BaseDynInst : public ExecContext, public RefCounted
         _prevDestRegIdx[idx] = previous_rename;
     }
 
+    void taintDestRegs(void)
+    {
+        for (auto dstreg: _destRegIdx) {
+            cpu->setTaint(dstreg);
+        }
+    }
+
     /** Renames a source logical register to the physical register which
      *  has/will produce that logical register's result.
      *  @todo: add in whether or not the source register is ready.
diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index b298b9baa..2566cf12a 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -1279,6 +1279,13 @@ FullO3CPU<Impl>::setMiscReg(int misc_reg,
 }
 
 template <class Impl>
+void
+FullO3CPU<Impl>::setTaint(PhysRegIdPtr phys_reg)
+{
+    regFile.setTaint(phys_reg);
+}
+
+template <class Impl>
 uint64_t
 FullO3CPU<Impl>::readIntReg(PhysRegIdPtr phys_reg)
 {
diff --git a/src/cpu/o3/cpu.hh b/src/cpu/o3/cpu.hh
index 19b9a34e0..23e6f7434 100644
--- a/src/cpu/o3/cpu.hh
+++ b/src/cpu/o3/cpu.hh
@@ -399,6 +399,9 @@ class FullO3CPU : public BaseO3CPU
     void setMiscReg(int misc_reg, const TheISA::MiscReg &val,
             ThreadID tid);
 
+    /** taint a register */
+    void setTaint(PhysRegIdPtr phys_reg);
+
     uint64_t readIntReg(PhysRegIdPtr phys_reg);
 
     TheISA::FloatReg readFloatReg(PhysRegIdPtr phys_reg);
diff --git a/src/cpu/o3/regfile.hh b/src/cpu/o3/regfile.hh
index 943df35b9..00b4ef045 100644
--- a/src/cpu/o3/regfile.hh
+++ b/src/cpu/o3/regfile.hh
@@ -182,6 +182,27 @@ class PhysRegFile
         return &miscRegIds[reg_idx];
     }
 
+    /** Set a physical register as tainted */
+    void setTaint(PhysRegIdPtr phys_reg) {
+      RegIndex idx = phys_reg->index();
+      switch (phys_reg->classValue()) {
+      case IntRegClass:
+        intTaintMap[idx] = true;
+        break;
+      case FloatRegClass:
+        floatTaintMap[idx] = true;
+        break;
+      case CCRegClass:
+        ccTaintMap[idx] = true;
+        break;
+      case MiscRegClass:
+        miscTaintMap[idx] = true;
+        break;
+      default:
+        break;
+      }
+    }
+
     /** Reads an integer register. */
     uint64_t readIntReg(PhysRegIdPtr phys_reg) const
     {