From: kajoljain379 <kajoljain797@gmail.com>
Date: Sat, 12 Jan 2019 08:43:02 +0000 (+0530)
Subject: arch-power: Added SystemCall Interrupt handler
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0cb1d09186e459d199bd7277aadce6d9d6117d12;p=gem5.git

arch-power: Added SystemCall Interrupt handler

Added system call interrupt handler.
Added handler calling in decoder file.

Change-Id: I80b99257fe4b96a1a286f17afcec28bb8a849b83
Signed-off-by: kajoljain379 <kajoljain797@gmail.com>
---

diff --git a/src/arch/power/faults.hh b/src/arch/power/faults.hh
index a6c7f4435..47b46cb8b 100644
--- a/src/arch/power/faults.hh
+++ b/src/arch/power/faults.hh
@@ -139,6 +139,23 @@ class PowerInterrupt : public PowerFaultBase
 };
 
 
+class SystemCallInterrupt : public PowerInterrupt
+{
+  public:
+    SystemCallInterrupt()
+    {
+    }
+    virtual void invoke(ThreadContext * tc, const StaticInstPtr &inst =
+                       StaticInst::nullStaticInstPtr)
+    {
+      //TODO: Right now it not handle case when LEV=0.
+      tc->setIntReg(INTREG_SRR0 , tc->instAddr() + 4);
+      PowerInterrupt::updateSRR1(tc);
+      PowerInterrupt::updateMsr(tc);
+      tc->pcState(SystemCallPCSet);
+    }
+};
+
 class DecrementerInterrupt : public PowerInterrupt
 {
   public:
diff --git a/src/arch/power/isa/decoder.isa b/src/arch/power/isa/decoder.isa
index 799aeb8c6..97ade360b 100644
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -164,9 +164,17 @@ decode PO default Unknown::unknown() {
         }
     }
 
+//TODO:Right now sc instruction not handles LEV=1 case
+
     format IntOp {
-        17: sc({{ xc->syscall(R0, &fault); }},
-               [ IsSyscall, IsNonSpeculative, IsSerializeAfter ]);
+        17: sc({{
+            if (FullSystem) {
+                fault= std::make_shared<SystemCallInterrupt>();
+            } else {
+                xc->syscall(R0, &fault);
+            }
+            }},
+              [ IsSyscall, IsNonSpeculative, IsSerializeAfter ]);
         2: tdi({{ }});
     }