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AltOR32 OpenRisc Simulator

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Details

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- Simple simulator for OpenRisc instructions, where only the essentials have been implemented.

- Compiles under Linux (make) or Windows (VS2003+).

- Able to execute OpenRisc 1000 (ORBIS32) code compiled with the following options:

   -msoft-div -msoft-float -msoft-mul -mno-ror -mno-cmov -mno-sext

Usage

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-f filename.bin = Executable to load (binary)   [Required]

-t              = Enable program trace          [Optional]

-v 0xX          = Trace Mask                    [Optional]

-b 0xnnnn       = Memory base address           [Optional]

-s 0xnnnn       = Memory size                   [Optional]

-l 0xnnnn       = Executable load address       [Optional]

-c nnnn         = Max instructions to execute   [Optional]

Console Output

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This simulator implements some of the basic l.nop extensions such as NOP_PUTC(4).

Example:

void putc(int c)

{

  register char  t1 asm ("r3") = c;

  asm volatile ("\tl.nop\t%0" : : "K" (4), "r" (t1));

}

Implementing Peripherals

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Peripherals can be implemented by creating a new class which inherits from 'Peripheral' and overrides the following functions to provide memory mapped I/O extensions;

    // Peripheral access

    virtual void        Reset(void)

    virtual void        Clock(void)

    virtual TRegister   Access(TAddress addr, TRegister data_in, TRegister wr, TRegister rd)

    virtual bool        Interrupt(void)

    virtual TAddress    GetStartAddress()

    virtual TAddress    GetStopAddress()

The new peripheral can then be attached to the simulator (using AttachPeripheral).