From: Ali Saidi <saidi@eecs.umich.edu>
Date: Fri, 17 Mar 2006 04:09:01 +0000 (-0500)
Subject: clean up condition codes a little bit
X-Git-Tag: m5_2.0_beta1~162
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cf942425393dbd7ac3d05a9c94aab5140d0bf617;p=gem5.git

clean up condition codes a little bit
put back in Tcc code that was deleted in last merge

arch/sparc/isa/bitfields.isa:
    clean up condition codes a little bit

--HG--
extra : convert_revision : c554fd5c3ee8cfd6643f69f8351124a7a4b5d9fa
---

diff --git a/arch/sparc/isa/bitfields.isa b/arch/sparc/isa/bitfields.isa
index 237f0fa64..988f067c6 100644
--- a/arch/sparc/isa/bitfields.isa
+++ b/arch/sparc/isa/bitfields.isa
@@ -7,13 +7,11 @@
 // simply defined alphabetically
 
 def bitfield A		<29>;
-def bitfield CC02	<20>;
-def bitfield CC03	<25>;
-def bitfield CC04	<11>;
-def bitfield CC12	<21>;
-def bitfield CC13	<26>;
-def bitfield CC14	<12>;
-def bitfield CC2	<18>;
+def bitfield BPCC       <21:20>; // for BPcc & FBPcc
+def bitfield FCMPCC     <26:56>; // for FCMP & FCMPEa
+def bitflied FMOVCC     <13:11>; // for FMOVcc
+def bitfield CC         <12:11>; // for MOVcc & Tcc
+def bitfierd MOVCC3     <18>; // also for MOVcc
 def bitfield CMASK	<6:4>;
 def bitfield COND2	<28:25>;
 def bitfield COND4	<17:14>;
diff --git a/arch/sparc/isa/decoder.isa b/arch/sparc/isa/decoder.isa
index 14280ef12..2b5296eed 100644
--- a/arch/sparc/isa/decoder.isa
+++ b/arch/sparc/isa/decoder.isa
@@ -10,7 +10,7 @@ decode OP default Unknown::unknown()
         //Throw an illegal instruction acception
         0x0: Trap::illtrap({{fault = new IllegalInstruction;}});
         0x1: Branch::bpcc({{
-            switch((CC12 << 1) | CC02)
+            switch(BPCC)
             {
               case 1:
               case 3:
@@ -387,7 +387,7 @@ decode OP default Unknown::unknown()
                 }
                 0x2B: BasicOperate::flushw({{\\window toilet}}); //FLUSHW
                 0x2C: movcc({{
-                        ccBank = (CC24 << 2) | (CC14 << 1) | (CC04 << 0);
+                        ccBank = (MOVCC3 << 2) | CC;
                         switch(ccBank)
                         {
                                 case 0: case 1: case 2: case 3:
@@ -511,20 +511,30 @@ decode OP default Unknown::unknown()
 
                 0x38: Branch::jmpl({{//Stuff}}); //JMPL
                 0x39: Branch::return({{//Other Stuff}}); //RETURN
-                0x3A: decode CC04
+                0x3A: decode CC
                 {
-                    // If CC04 == 1, it's an illegal instruction
-                    0x0: decode CC14
-                    {
-                        0x0: Trap::tcci({{
-                            if(passesCondition(ccr_icc, machInst<25:28>))
-                                fault = new TrapInstruction;
-                        }});
-                        0x1: Trap::tccx({{
-                            if(passesCondition(ccr_xcc, machInst<25:28>))
-                                fault = new TrapInstruction;
-                        }});
-                    }
+                    0x0: Trap::tcci({{
+#if FULL_SYSTEM
+                         fault = new TrapInstruction;
+#else
+                         if(passesCondition(ccr_icc, machInst<25:28>))
+                              // At least glibc only uses trap 0,
+                              // solaris/sunos may use others
+                              assert((I ? Rs1 + Rs2 : Rs1 + SW_TRAP) == 0);
+                              xc->syscall();
+#endif
+                    }});
+                    0x2: Trap::tccx({{
+#if FULL_SYSTEM
+                         fault = new TrapInstruction;
+#else
+                         if(passesCondition(ccr_xcc, machInst<25:28>))
+                              // At least glibc only uses trap 0,
+                              // solaris/sunos may use others
+                              assert((I ? Rs1 + Rs2 : Rs1 + SW_TRAP) == 0);
+                              xc->syscall();
+#endif
+                    }});
                 }
                 0x3B: BasicOperate::flush({{//Lala}}); //FLUSH
                 0x3C: BasicOperate::save({{//leprechauns); //SAVE