h8s_stub.c

eCos操作系统源码

//========================================================================
//
//      h8s_stub.c
//
//      Helper functions for H8S 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
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     Yoshinori Sato
// Contributors:  Yoshinori Sato
// Date:          2002-05-03
// Purpose:       
// Description:   Helper functions for H8S stub
// Usage:         
//
//####DESCRIPTIONEND####
//
//========================================================================

#include <stddef.h>

#include <pkgconf/hal.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#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_TRACE:
    case CYGNUM_HAL_VECTOR_TRAP3:
        return SIGTRAP;
    default:
        return SIGINT;
    }
}

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

int __get_trap_number (void)
{
    extern int CYG_LABEL_NAME(_intvector);
    // The vector is not not part of the GDB register set so get it
    // directly from the save context.
    return CYG_LABEL_NAME(_intvector);
}

/*--------------------------------------------------------------------*/
/* 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. 
 */

/* Clear any single-step breakpoint(s) that may have been set.  */

void __clear_single_step (void)
{
    int exr;
    exr = get_register(EXR);
    exr &= 0x7f;  /* clear T flag */
    put_register(EXR,exr);
}

/* Set breakpoint(s) to simulate a single step from the current PC.  */

void __single_step (void)
{
    int exr;
    exr = get_register(EXR);
    exr |= 0x80;  /* set T flag */
    put_register(EXR,exr);
}

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. */

externC void CYG_LABEL_NAME(breakinst)(void);
int
__is_breakpoint_function ()
{
    return get_register (PC) == (target_register_t)&CYG_LABEL_NAME(breakinst);
}


/* Skip the current instruction. */
/* only TRAPA instruction */

void __skipinst (void)
{
    put_register (PC, get_register(PC) + 2);
}

#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS