Re: [GXemul-users] MIPS 4KEc Coprocessor

[Thomas M. <mai...@gm...>]

I am running the current SVN version.  The command line is the following 
and the error occurs at step 4.
Maybe I did not initialize the cpu right. The first

./gxemul -V amazon.gxemul
GXemul (unknown version)      Copyright (C) 2003-2011  Anders Gavare

amazon.gxemul loaded

GXemul> step
step 2: cpu0: 0xbfc00000    10000007   b   0xffffffffbfc00020
         => cpu0.inDelaySlot: false -> true
         => cpu0.pc: 0xffffffffbfc00000 -> 0xffffffffbfc00004
GXemul> step
step 3: cpu0: 0xbfc00004    00000000 (delayslot)   nop
         => cpu0.inDelaySlot: true -> false
         => cpu0.pc: 0xffffffffbfc00004 -> 0xffffffffbfc00020
GXemul> step
step 4: cpu0: 0xbfc00020    40809000   unimplemented: cop0
         cpu0: unimplemented opcode 0x10
         cpu0: instruction translation failed
         Single-stepping aborted.
GXemul> root
   root
   \-- mainbus0
       |-- cpu0  (4KEc, 100 MHz)
       \-- rom0  (16 MB at offset 0x1fc00000)

   accuracy = cycle
   step     = 0x4


The beginning of the configuration file for the cpu is the following:

component root
{
     string accuracy "cycle"
     string name "root"
     uint64 step 0x2
     string template ""
     component mainbus
     {
         string name "mainbus0"
         uint64 step 0
         string template ""
         component mips_cpu
         {
             uint64 a0 0
             uint64 a1 0
             uint64 a2 0
             uint64 a3 0
             uint64 a4 0
             uint64 a5 0
             uint64 a6 0
             uint64 a7 0
             string abi "n64"
             string architecture "MIPS"
             uint64 at 0
             bool bigendian true
             uint64 delaySlotTarget 0xffffffffbfc00020
             uint64 fp 0
             double frequency 1e+08
             sint32 functionCallTraceDepth 0
             uint64 gp 0
             bool hasUsedUnassemble false
             uint64 hi 0
             bool inDelaySlot false
             uint64 k0 0
             uint64 k1 0
             uint64 lastDumpAddr 0
             uint64 lastUnassembleVaddr 0
             uint64 lo 0
             string model "4KEc"
             string name "cpu0"
             sint64 nrOfTracedFunctionCalls 0
             bool paused false
             uint64 pc 0xffffffffbfc00000
             uint64 ra 0
             uint64 s0 0
             uint64 s1 0
             uint64 s2 0
             uint64 s3 0
             uint64 s4 0
             uint64 s5 0
             uint64 s6 0
             uint64 s7 0
             bool showFunctionTraceCall false
             bool showFunctionTraceReturn false
             uint64 sp 0xffffffffa0007f00
             uint64 step 0x2
             uint64 t4 0
             uint64 t5 0
             uint64 t6 0
             uint64 t7 0
             uint64 t8 0
             uint64 t9 0
             string template ""
             uint64 v0 0
             uint64 v1 0
             uint64 zr 0
         }
         component ram

I hope that this information is useful for troubleshooting.

Thomas


On 08/17/2011 06:43 PM, Anders Gavare wrote:
> Ons 2011-08-17 klockan 10:48 +0200 skrev Thomas Mair:
>> i am trying to run an image file on a MIPS 4KEc processor. Unfortunately
>> the execution of the image stops, when trying to acess the coprocessor
>> with a mtc0 instruction. I tried to read the source code and came to the
>> conclusion that the coprocessor access is missing.
> What version of GXemul are you running, and how does the complete
> command line look when you are starting up the emulation? And what is
> the exact error?
>
> (The standard system coprocessor 0 is implemented in cpu_mips_coproc.cc,
> but maybe your command line arguments cause the coprocessor to not be
> initialized properly.)
>
>
> Anders
>
>