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

//

//      fr30_stub.c

//

//      Fujitsu FR30-specific code for remote debugging via gdb

//

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

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

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//

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

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// for more details.                                                        

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//

// As a special exception, if other files instantiate templates or use      

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// General Public License v2.                                               

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):     larsi

// Contributors:  

// Date:          2007-07-09

// Purpose:       

// Description:   Helper functions for gdb stub for FR30 processors

// Usage:         

//

//####DESCRIPTIONEND####

//

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

#include <stddef.h>

#include <pkgconf/hal.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS

#include <cyg/hal/hal_stub.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/infra/cyg_ass.h>          // assertion macros

#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_COPR_NOT_FOUND:

    case CYGNUM_HAL_VECTOR_COPR_ERROR:

        return SIGFPE;

        // step trace TRAP

    case CYGNUM_HAL_VECTOR_DEBUG:

        // INTE

    case CYGNUM_HAL_VECTOR_BREAKPOINT:

        return SIGTRAP;

        /* System call instruction executed */

    case CYGNUM_HAL_VECTOR_SYSTEM_CALL ... CYGNUM_HAL_VECTOR_TRAPLAST:

        return SIGSYS;

        /* External interrupt */

    case CYGNUM_HAL_INTERRUPT_0 ... CYGNUM_HAL_INTERRUPT_DELAYED_IRQ:

      return SIGINT;

      // Illegal or reserved instruction

    case CYGNUM_HAL_VECTOR_OPCODE:

        return SIGILL;

    // Marks port does think to return SIGTRAP as default.

    default:

        return SIGTERM;

    }

}

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

int __get_trap_number (void)

{

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

    // directly from the save context.

    return _hal_registers->last_trap;

}

/* 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. */

void __single_step (void)

{

  /* Trying to use processors single stepping.

     This means to set T flag in PS register. */

    put_register (PS, get_register (PS) | 0x100);

}

/* Clear the single-step state. */

void __clear_single_step (void)

{

    put_register (PS, get_register (PS) & ~0x100);

}

void __install_breakpoints ()

{

  /*  if (instrBuffer.targetAddr != NULL)

    {

      instrBuffer.savedInstr = *instrBuffer.targetAddr;

      *instrBuffer.targetAddr = __break_opcode ();

      } */

  /* Install the breakpoints in the breakpoint list */

  __install_breakpoint_list();

  // No need to flush caches here; Generic stub code will handle this.

}

void __clear_breakpoints (void)

{

  __clear_breakpoint_list();

}

/* 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)&_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 2. */

void __skipinst (void)

{

    put_register (PC, get_register (PC) + 2);

}

/* Get a register out of the GDB register structure */

target_register_t

get_register (regnames_t reg)

{

    GDB_Registers* gdb_regs;

    gdb_regs = (GDB_Registers*)_registers;

    if (reg >= R0 && reg <= MDL)

        return gdb_regs->r[reg];

    return 0xdeadbeef;

}

/* Put a register into the GDB register structure */

void

put_register (regnames_t reg, target_register_t value)

{

    GDB_Registers* gdb_regs;

    gdb_regs = (GDB_Registers*)_registers;

    if (reg >= R0 && reg <= MDL) {

        gdb_regs->r[reg] = value;

    } else {

        CYG_FAIL("Attempt to write to non-existent register ");

    }

}

#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

// EOF openrisc_stub.c