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//========================================================================
//
//      h8s_stub.c
//
//      Helper functions for H8S stub
//
//========================================================================
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// -------------------------------------------                              
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//
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// for more details.                                                        
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//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
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// General Public License v2.                                               
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//========================================================================
//#####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