Minor Sconscript edit ... mips decoder changes ... initialize NNPC and output fault name in simple cpu

SConscript:
    Separate Alpha EIO from syscall building for other architectures
arch/isa_specific.hh:
    change MIPS constant to 34k
arch/mips/isa/decoder.isa:
    Allow sll,ssnop,nop, and ehb to be determined through decoder using
    the different types of default cases
arch/mips/isa/formats/branch.isa:
    Delete debug code
arch/mips/isa/formats/noop.isa:
    add a Nop format
arch/mips/isa_traits.hh:
    use constants instead of enums
arch/mips/process.cc:
    point to the correct header file
cpu/simple/cpu.cc:
    Output the actual fault name
sim/process.cc:
    Inititalize NNPC

--HG--
extra : convert_revision : adb0026dfad25b14c98fb03c98bfe9c681bba6f8

SConscript

@@ -248,16 +248,21 @@ turbolaser_sources = Split('''
 
 # Syscall emulation (non-full-system) sources
 syscall_emulation_sources = Split('''
-
-	encumbered/eio/exolex.cc
-	encumbered/eio/libexo.cc
-	encumbered/eio/eio.cc
         kern/linux/linux.cc
         kern/tru64/tru64.cc
 	sim/process.cc
 	sim/syscall_emul.cc
         ''')
 
+alpha_eio_sources = Split('''
+	encumbered/eio/exolex.cc
+	encumbered/eio/libexo.cc
+	encumbered/eio/eio.cc
+        ''')
+
+if env['TARGET_ISA'] == 'ALPHA_ISA':
+    syscall_emulation_sources += alpha_eio_sources
+    
 memtest_sources = Split('''
 	cpu/memtest/memtest.cc
         ''')

arch/isa_specific.hh

@@ -45,7 +45,7 @@
 //would treat them as 0 in comparisons.
 #define ALPHA_ISA 21064
 #define SPARC_ISA 42
-#define MIPS_ISA 1337
+#define MIPS_ISA 34000
 
 //These tell the preprocessor where to find the files of a particular
 //ISA, and set the "TheISA" macro for use elsewhere.

arch/mips/isa/decoder.isa

@@ -30,11 +30,17 @@ decode OPCODE_HI default Unknown::unknown() {
                     //Table A-3 Note: "1. Specific encodings of the rt, rd, and sa fields
                     //are used to distinguish among the SLL, NOP, SSNOP and EHB functions."
 
-                    0x0: decode RS {
+                    0x0: decode RS  {
-                        0x0: sll({{ Rd = Rt.uw << SA; }});
+                        0x0: decode RT {
-                        //0x0:nop({{ ; }});  //really sll r0,r0,0
+                                 0x0: decode RD default Nop::nop() {
-                        //	    0x1:ssnop({{ ; }});//really sll r0,r0,1
+                                  0x0: decode SA {
-                        //    0x3:ehb({{ ; }});  //really sll r0,r0,3
+                                      0x1: ssnop({{ ; }});  //really sll r0,r0,1
+                                      0x3: ehb({{ ; }});  //really sll r0,r0,3
+                                  }
+                             }
+                        }
+
+                      default: sll({{ Rd = Rt.uw << SA; }});
                     }
 
                     0x2: decode SRL {

arch/mips/isa/formats/branch.isa

@@ -265,8 +265,6 @@ def format Branch(code,*flags) {{
     code += '  NNPC = NNPC;\n'
     code += '} \n'
 
-    code += 'cout << hex << "NPC: " << NPC << " + " << disp << " = " << NNPC << endl;'
-
     iop = InstObjParams(name, Name, 'Branch', CodeBlock(code),
                         ('IsDirectControl', 'IsCondControl'))
 
@@ -305,8 +303,6 @@ def format Jump(code,*flags) {{
     if strlen > 1 and name[1:] == 'al':
             code = 'r31 = NNPC;\n' + code
 
-    #code += 'if(NNPC == 0x80000638) { NNPC = r31; cout << "SKIPPING JUMP TO SIM_GET_MEM_CONF" << endl;}'
-    #code += 'target = NNPC;'
 
     iop = InstObjParams(name, Name, 'Jump', CodeBlock(code),\
                         ('IsIndirectControl', 'IsUncondControl'))

arch/mips/isa/formats/noop.isa

@@ -88,3 +88,7 @@ def format BasicOperateWithNopCheck(code, *opt_args) {{
     exec_output = BasicExecute.subst(iop)
 }};
 
+def format Nop() {{
+        decode_block = 'return new Nop(\"sll r0,r0,0\",machInst);\n'
+}};
+

arch/mips/isa_traits.hh

@@ -96,46 +96,56 @@ namespace MipsISA
     typedef uint64_t ExtMachInst;
     typedef uint8_t  RegIndex;
 //  typedef uint64_t Addr;
-    enum {
-        MemoryEnd = 0xffffffffffffffffULL,
 
-        NumIntRegs = 32,
+       // Constants Related to the number of registers
-        NumFloatRegs = 32,
-        NumMiscRegs = 258, //account for hi,lo regs
 
-        MaxRegsOfAnyType = 32,
+    const int NumIntArchRegs = 32;
-        // Static instruction parameters
+    const int NumPALShadowRegs = 8;
-        MaxInstSrcRegs = 3,
+    const int NumFloatArchRegs = 32;
-        MaxInstDestRegs = 2,
+    // @todo: Figure out what this number really should be.
+    const int NumMiscArchRegs = 32;
 
-        // semantically meaningful register indices
+    const int NumIntRegs = NumIntArchRegs + NumPALShadowRegs;
-        ZeroReg = 0,	// architecturally meaningful
+    const int NumFloatRegs = NumFloatArchRegs;
-        // the rest of these depend on the ABI
+    const int NumMiscRegs = NumMiscArchRegs;
-        StackPointerReg = 30,
-        GlobalPointerReg = 29,
-        ProcedureValueReg = 27,
-        ReturnAddressReg = 26,
-        ReturnValueReg = 0,
-        FramePointerReg = 15,
-        ArgumentReg0 = 16,
-        ArgumentReg1 = 17,
-        ArgumentReg2 = 18,
-        ArgumentReg3 = 19,
-        ArgumentReg4 = 20,
-        ArgumentReg5 = 21,
-        SyscallNumReg = ReturnValueReg,
-        SyscallPseudoReturnReg = ArgumentReg4,
-        SyscallSuccessReg = 19,
-        LogVMPageSize = 13,	// 8K bytes
-        VMPageSize = (1 << LogVMPageSize),
 
-        BranchPredAddrShiftAmt = 2, // instructions are 4-byte aligned
+    const int TotalNumRegs = NumIntRegs + NumFloatRegs +
+    NumMiscRegs + 0/*NumInternalProcRegs*/;
+
+    const int TotalDataRegs = NumIntRegs + NumFloatRegs;
+
+    // Static instruction parameters
+    const int MaxInstSrcRegs = 3;
+    const int MaxInstDestRegs = 2;
+
+    // semantically meaningful register indices
+    const int ZeroReg = 31;	// architecturally meaningful
+    // the rest of these depend on the ABI
+    const int StackPointerReg = 30;
+    const int GlobalPointerReg = 29;
+    const int ProcedureValueReg = 27;
+    const int ReturnAddressReg = 26;
+    const int ReturnValueReg = 0;
+    const int FramePointerReg = 15;
+    const int ArgumentReg0 = 16;
+    const int ArgumentReg1 = 17;
+    const int ArgumentReg2 = 18;
+    const int ArgumentReg3 = 19;
+    const int ArgumentReg4 = 20;
+    const int ArgumentReg5 = 21;
+    const int SyscallNumReg = ReturnValueReg;
+    const int SyscallPseudoReturnReg = ArgumentReg4;
+    const int SyscallSuccessReg = 19;
+
+    const int LogVMPageSize = 13;	// 8K bytes
+    const int VMPageSize = (1 << LogVMPageSize);
+
+    const int BranchPredAddrShiftAmt = 2; // instructions are 4-byte aligned
+
+    const int WordBytes = 4;
+    const int HalfwordBytes = 2;
+    const int ByteBytes = 1;
 
-        WordBytes = 4,
-        HalfwordBytes = 2,
-        ByteBytes = 1,
-        DepNA = 0,
-    };
 
     // These enumerate all the registers for dependence tracking.
     enum DependenceTags {
@@ -402,15 +412,6 @@ extern const Addr PageOffset;
     };
 #endif
 
-    enum {
-        TotalNumRegs =
-        NumIntRegs + NumFloatRegs + NumMiscRegs + NumInternalProcRegs
-    };
-
-    enum {
-        TotalDataRegs = NumIntRegs + NumFloatRegs
-    };
-
     typedef union {
         IntReg  intreg;
         FloatReg   fpreg;

arch/mips/process.cc

@@ -27,7 +27,7 @@
  */
 
 #include "arch/mips/process.hh"
-#include "arch/mips/linux/process.hh"
+#include "arch/mips/linux_process.hh"
 #include "base/loader/object_file.hh"
 #include "base/misc.hh"
 

cpu/simple/cpu.cc

@@ -961,6 +961,9 @@ SimpleCPU::tick()
 #define IFETCH_FLAGS(pc)	0
 #endif
 
+        DPRINTF(Fetch,"Fetching PC:%08p NPC:%08p NNPC:%08p\n",cpuXC->readPC(),
+                cpuXC->readNextPC(),cpuXC->readNextNPC());
+
 #if SIMPLE_CPU_MEM_TIMING
         CpuRequest *ifetch_req = new CpuRequest();
         ifetch_req->size = sizeof(MachInst);
@@ -1077,7 +1080,7 @@ SimpleCPU::tick()
 #if FULL_SYSTEM
         fault->invoke(xcProxy);
 #else // !FULL_SYSTEM
-        fatal("fault (%d) detected @ PC %08p", fault, cpuXC->readPC());
+        fatal("fault (%s) detected @ PC %08p", fault->name(), cpuXC->readPC());
 #endif // FULL_SYSTEM
     }
     else {

sim/process.cc

@@ -363,6 +363,7 @@ LiveProcess::startup()
     Addr prog_entry = objFile->entryPoint();
     execContexts[0]->setPC(prog_entry);
     execContexts[0]->setNextPC(prog_entry + sizeof(MachInst));
+    execContexts[0]->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
 
     num_processes++;
 }