From bd96f10f997de75d31192cb232f50c37b4a11eac Mon Sep 17 00:00:00 2001
From: Gabe Black <gabeblack@google.com>
Date: Mon, 6 Nov 2017 19:25:21 -0800
Subject: [PATCH] sparc: Return debug faults from unimplemented instructions.

These had been marked as non-speculative so that their execute
functions would only be called if the instruction should really be
executed. Instead, we can return faults which will cause the same
behavior when the instruction is committed and let the instruction
execute as normal.

Change-Id: I39fa5073e93399424144724b99bdc12070e42286
Reviewed-on: https://gem5-review.googlesource.com/5465
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
---
 src/arch/sparc/insts/unimp.hh | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/src/arch/sparc/insts/unimp.hh b/src/arch/sparc/insts/unimp.hh
index c0d97858f..a63443a4c 100644
--- a/src/arch/sparc/insts/unimp.hh
+++ b/src/arch/sparc/insts/unimp.hh
@@ -31,6 +31,9 @@
 #ifndef __ARCH_SPARC_INSTS_UNIMP_HH__
 #define __ARCH_SPARC_INSTS_UNIMP_HH__
 
+#include <memory>
+
+#include "arch/generic/debugfaults.hh"
 #include "arch/sparc/insts/static_inst.hh"
 #include "base/cprintf.hh"
 
@@ -55,17 +58,14 @@ class FailUnimplemented : public SparcStaticInst
     /// Constructor
     FailUnimplemented(const char *_mnemonic, ExtMachInst _machInst) :
             SparcStaticInst(_mnemonic, _machInst, No_OpClass)
-    {
-        // don't call execute() (which panics) if we're on a
-        // speculative path
-        flags[IsNonSpeculative] = true;
-    }
+    {}
 
     Fault
     execute(ExecContext *xc, Trace::InstRecord *traceData) const override
     {
-        panic("attempt to execute unimplemented instruction '%s' "
-              "(inst 0x%08x)", mnemonic, machInst);
+        return std::make_shared<GenericISA::M5PanicFault>(
+            "attempt to execute unimplemented instruction '%s' (inst %#08x)",
+            mnemonic, machInst);
     }
 
     std::string
@@ -94,17 +94,14 @@ class WarnUnimplemented : public SparcStaticInst
     /// Constructor
     WarnUnimplemented(const char *_mnemonic, ExtMachInst _machInst) :
             SparcStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
-    {
-        // don't call execute() (which panics) if we're on a
-        // speculative path
-        flags[IsNonSpeculative] = true;
-    }
+    {}
 
     Fault
     execute(ExecContext *xc, Trace::InstRecord *traceData) const override
     {
         if (!warned) {
-            warn("instruction '%s' unimplemented\n", mnemonic);
+            return std::make_shared<GenericISA::M5WarnFault>(
+                "instruction '%s' unimplemented\n", mnemonic);
             warned = true;
         }
         return NoFault;
-- 
2.30.2