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//========================================================================

//

//      m68k_stub.c

//

//      Helper functions for stub

//

//========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

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//

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// or inline functions from this file, or you compile this file and link it

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//####ECOSGPLCOPYRIGHTEND####

//========================================================================

#include <stddef.h>

#include <pkgconf/hal.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#include <cyg/hal/hal_stub.h>

#include <cyg/hal/hal_stub.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT

#include <cyg/hal/dbg-threads-api.h>    // dbg_currthread_id

#endif

/* Given a trap value TRAP, return the corresponding signal. */

int __computeSignal (unsigned int trap_number)

{

    switch (trap_number)

    {

    case CYGNUM_HAL_VECTOR_BUSERR:

    case CYGNUM_HAL_VECTOR_ADDERR:

        return SIGBUS;

    case CYGNUM_HAL_VECTOR_ILLINST:

        return SIGILL;

    case CYGNUM_HAL_VECTOR_ZERODIV:

        /* This isn't quite accurate: this is integer division only. */

        return SIGFPE;

    case CYGNUM_HAL_VECTOR_CHKINST:

    case CYGNUM_HAL_VECTOR_TRAPVINST:

        return SIGTRAP;

    case CYGNUM_HAL_VECTOR_PRIVVIOLATION:

        return SIGILL;

    case CYGNUM_HAL_VECTOR_TRACE:

        /* Instruction trace */

        return SIGTRAP;

    case CYGNUM_HAL_VECTOR_L1010:

    case CYGNUM_HAL_VECTOR_L1111:

    case CYGNUM_HAL_VECTOR_UNINITINT:

    case CYGNUM_HAL_VECTOR_SPURINT:

        return SIGTRAP;

    case CYGNUM_HAL_VECTOR_TRAPFIRST ... CYGNUM_HAL_VECTOR_TRAPLAST:

        return SIGTRAP;

    case CYGNUM_HAL_VECTOR_AUTOVEC1 ... CYGNUM_HAL_VECTOR_AUTOVEC7:

    case CYGNUM_HAL_VECTOR_INTRFIRST ... CYGNUM_HAL_VECTOR_INTRLAST:

        /* External interrupt */

        return SIGINT;

    default:

        return SIGTERM;

    }

}

/* Return the trap number corresponding to the last-taken trap. */

int __get_trap_number (void)

{

        //extern int hal_m68k_trap_number;

    // The vector is not not part of the GDB register set so get it

    // directly from the save context.

    //return hal_m68k_trap_number;

    return 1;

}

/* Set the currently-saved pc register value to PC. This also updates NPC

   as needed. */

void set_pc (target_register_t pc)

{

    put_register (PC, pc);

}

/*----------------------------------------------------------------------

 * Single-step support

 */

/* Set things up so that the next user resume will execute one instruction.

   This may be done by setting breakpoints or setting a single step flag

   in the saved user registers, for example. */

#define SR_TRACE 0x8000

void __single_step (void)

{

    target_register_t sr = get_register (PS);

    // Set trace flag in the exception context.

    sr |= SR_TRACE;

    put_register (PS, sr);

}

/* Clear the single-step state. */

void __clear_single_step (void)

{

    target_register_t sr = get_register (PS);

    // Clear single-step flag in the exception context.

    sr &= ~SR_TRACE;

    put_register (PS, sr);

}

void __install_breakpoints (void)

{

    /* NOP since single-step HW exceptions are used instead of

       breakpoints. */

}

void __clear_breakpoints (void)

{

}

/* If the breakpoint we hit is in the breakpoint() instruction, return a

   non-zero value. */

int

__is_breakpoint_function ()

{

    return get_register (PC) == (target_register_t)&CYG_LABEL_NAME(breakinst);

}

/* Skip the current instruction.  Since this is only called by the

   stub when the PC points to a breakpoint or trap instruction,

   we can safely just skip 4. */

void __skipinst (void)

{

    put_register (PC, get_register (PC) + 4);

}

#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS