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/*
 **************************************************************************
 *
 * Component =   
 * 
 * Synopsis  =   rdbg/powerpc/rdbg_f.c
 *
 * $Id: rdbg_f.c,v 1.2 2001-09-27 12:02:02 chris Exp $
 *
 **************************************************************************
 */
 
#include <assert.h>
#include <errno.h>
#include <rdbg/reg.h>               
#include <rdbg/remdeb.h>
#include <rdbg/rdbg.h>
#include <rtems/score/cpu.h>    
#include <rtems/score/thread.h> 
#include <libcpu/cpu.h>
 
void
CtxToRegs (const CPU_Exception_frame* ctx, xdr_regs* regs)
{
  * ((CPU_Exception_frame*) regs) = *ctx;
}
 
 
    void
RegsToCtx (const xdr_regs* regs, CPU_Exception_frame* ctx)
{
  *ctx = * ((CPU_Exception_frame*) regs);
}
 
void
get_ctx_thread( Thread_Control *thread, CPU_Exception_frame* ctx)
{
  unsigned int *ptr;
  unsigned int i;
 
  ctx->EXC_SRR0	= thread->Registers.pc;
  ctx->EXC_SRR1	= thread->Registers.msr;
  ctx->_EXC_number = 0xdeadbeef;
 
  ctx->GPR1	= thread->Registers.gpr1;
  ctx->GPR2	= thread->Registers.gpr2;
  /*
   * Fill with dummy values...
   */
  ptr = &ctx->GPR3;
  for (i = 0; i < 10; i++)
    ptr [i] = 0xdeadbeef;
 
  ctx->GPR13	= thread->Registers.gpr13;
  ctx->GPR14	= thread->Registers.gpr14;
  ctx->GPR15	= thread->Registers.gpr15;
  ctx->GPR16	= thread->Registers.gpr16;
  ctx->GPR17	= thread->Registers.gpr17;
  ctx->GPR18	= thread->Registers.gpr18;
  ctx->GPR19	= thread->Registers.gpr19;
  ctx->GPR20	= thread->Registers.gpr20;
  ctx->GPR21	= thread->Registers.gpr21;
  ctx->GPR22	= thread->Registers.gpr22;
  ctx->GPR23	= thread->Registers.gpr23;
  ctx->GPR24	= thread->Registers.gpr24;
  ctx->GPR25	= thread->Registers.gpr25;
  ctx->GPR26	= thread->Registers.gpr26;
  ctx->GPR27	= thread->Registers.gpr27;
  ctx->GPR28	= thread->Registers.gpr28;
  ctx->GPR29	= thread->Registers.gpr29;
  ctx->GPR30	= thread->Registers.gpr30;
  ctx->GPR31	= thread->Registers.gpr31;
  ctx->EXC_CR	= thread->Registers.cr;
  ctx->EXC_CTR	= 0xdeadbeef;
  ctx->EXC_XER	= 0xdeadbeef;
  ctx->EXC_LR	= 0xdeadbeef;
  ctx->EXC_MSR	= 0xdeadbeef;
  ctx->EXC_DAR	= 0xdeadbeef;
}
 
void
set_ctx_thread( Thread_Control *thread, CPU_Exception_frame* ctx)
{
  thread->Registers.gpr1	= ctx->GPR1;
  thread->Registers.gpr2	= ctx->GPR2;
 
  thread->Registers.gpr13	= ctx->GPR13;
  thread->Registers.gpr14	= ctx->GPR14;
  thread->Registers.gpr15	= ctx->GPR15;
  thread->Registers.gpr16	= ctx->GPR16;
  thread->Registers.gpr17	= ctx->GPR17;
  thread->Registers.gpr18	= ctx->GPR18;
  thread->Registers.gpr19	= ctx->GPR19;
  thread->Registers.gpr20	= ctx->GPR20;
  thread->Registers.gpr21	= ctx->GPR21;
  thread->Registers.gpr22	= ctx->GPR22;
  thread->Registers.gpr23	= ctx->GPR23;
  thread->Registers.gpr24	= ctx->GPR24;
  thread->Registers.gpr25	= ctx->GPR25;
  thread->Registers.gpr26	= ctx->GPR26;
  thread->Registers.gpr27	= ctx->GPR27;
  thread->Registers.gpr28	= ctx->GPR28;
  thread->Registers.gpr29	= ctx->GPR29;
  thread->Registers.gpr30	= ctx->GPR30;
  thread->Registers.gpr31	= ctx->GPR31;
  thread->Registers.cr		= ctx->EXC_CR;
  thread->Registers.pc		= ctx->EXC_SRR0;
  thread->Registers.msr		= ctx->EXC_SRR1;
}
 
 
 
int
Single_Step(CPU_Exception_frame* ctx)
{
  if ((ctx->EXC_SRR1 & MSR_SE) != 0  ||  ExitForSingleStep != 0) {
    /* Check coherency */
    assert ((ctx->EXC_SRR1 & MSR_SE) != 0);
    assert (ExitForSingleStep != 0);
    return 0;
  }
  ctx->EXC_SRR1 |= MSR_SE;
  ++ExitForSingleStep;
  return 0;
}
 
 int
CheckForSingleStep (CPU_Exception_frame* ctx)
{
    if (ExitForSingleStep) {
	    /*
	     *  This functions can be called both from
	     *  INT1 and INT3 handlers. In case it is
	     *  called from INT3, need to clear TF.
	     */
	ctx->EXC_SRR1 &= ~MSR_SE;
	ExitForSingleStep = 0;
	return 1;
    }
    return 0;
}
 
void
CancelSingleStep (CPU_Exception_frame* ctx)
{
	/* Cancel scheduled SS */
  ctx->EXC_SRR1 &= ~MSR_SE;
  ExitForSingleStep-- ;
}
cpuExcHandlerType oldExcHandler;
 
void connect_rdbg_exception()
{
 oldExcHandler = globalExceptHdl;
 globalExceptHdl = BreakPointExcHdl ;
}