arch-x86: Get rid of the soft int Fault class.

This was never instantiated, and not fully implemented.

Change-Id: I2011e49345e48e194ed9f1540446f0f5a699401d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55689
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>

src/arch/x86/faults.cc

@@ -71,8 +71,7 @@ X86FaultBase::invoke(ThreadContext *tc, const StaticInstPtr &inst)
     HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
     MicroPC entry;
     if (m5reg.mode == LongMode) {
-        entry = isSoft() ? extern_label_longModeSoftInterrupt :
-                           extern_label_longModeInterrupt;
+        entry = extern_label_longModeInterrupt;
     } else {
         if (m5reg.submode == RealMode)
             entry = extern_label_realModeInterrupt;
@@ -88,9 +87,6 @@ X86FaultBase::invoke(ThreadContext *tc, const StaticInstPtr &inst)
             panic("Legacy mode interrupts with error codes "
                     "aren't implemented.");
         }
-        // Software interrupts shouldn't have error codes. If one
-        // does, there would need to be microcode to set it up.
-        assert(!isSoft());
         tc->setIntReg(INTREG_MICRO(15), errorCode);
     }
     pc.upc(romMicroPC(entry));

src/arch/x86/faults.hh

@@ -70,7 +70,6 @@ class X86FaultBase : public FaultBase
     const char *name() const override { return faultName; }
     virtual bool isBenign() { return true; }
     virtual const char *mnemonic() const { return mnem; }
-    virtual bool isSoft() { return false; }
 
     void invoke(ThreadContext *tc, const StaticInstPtr &inst=
                 nullStaticInstPtr) override;
@@ -369,16 +368,6 @@ class StartupInterrupt : public X86Interrupt
                 nullStaticInstPtr) override;
 };
 
-class SoftwareInterrupt : public X86Interrupt
-{
-  public:
-    SoftwareInterrupt(uint8_t _vector) :
-        X86Interrupt("Software Interrupt", "#INTR", _vector)
-    {}
-
-    bool isSoft() override { return true; }
-};
-
 } // namespace X86ISA
 } // namespace gem5