/* Host-dependent code for Sun-3 for GDB, the GNU debugger.
   Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc.

This file is part of GDB.

This program 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 of the License, or
(at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"

#include <sys/ptrace.h>
#define KERNEL		/* To get floating point reg definitions */
#include <machine/reg.h>

extern int errno;

#if defined (GDB_TARGET_IS_SUN3)
/* All of this stuff is only relevant if both host and target are sun3.  */
void
fetch_inferior_registers ()
{
  struct regs inferior_registers;
#ifdef FP0_REGNUM
  struct fp_status inferior_fp_registers;
#endif
  extern char registers[];

  registers_fetched ();
  
  ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
#ifdef FP0_REGNUM
  ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
#endif 
  
  bcopy (&inferior_registers, registers, 16 * 4);
#ifdef FP0_REGNUM
  bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
	 sizeof inferior_fp_registers.fps_regs);
#endif 
  *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
#ifdef FP0_REGNUM
  bcopy (&inferior_fp_registers.fps_control,
	 &registers[REGISTER_BYTE (FPC_REGNUM)],
	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
#endif 
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */

store_inferior_registers (regno)
     int regno;
{
  struct regs inferior_registers;
#ifdef FP0_REGNUM
  struct fp_status inferior_fp_registers;
#endif
  extern char registers[];

  bcopy (registers, &inferior_registers, 16 * 4);
#ifdef FP0_REGNUM
  bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
	 sizeof inferior_fp_registers.fps_regs);
#endif
  inferior_registers.r_ps = *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
  inferior_registers.r_pc = *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];

#ifdef FP0_REGNUM
  bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	 &inferior_fp_registers.fps_control,
	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
#endif

  ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
#if FP0_REGNUM
  ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
#endif
}

/* Machine-dependent code for pulling registers out of a Sun-3 core file. */

void
fetch_core_registers (core_reg_sect, core_reg_size, which)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
{
  extern char registers[];
  struct regs *regs = (struct regs *) core_reg_sect;

  if (which == 0) {
    if (core_reg_size < sizeof (struct regs))
      error ("Can't find registers in core file");

    bcopy ((char *)regs, registers, 16 * 4);
    supply_register (PS_REGNUM, &regs->r_ps);
    supply_register (PC_REGNUM, &regs->r_pc);

  } else if (which == 2) {

#define fpustruct  ((struct fpu *) core_reg_sect)

    if (core_reg_size >= sizeof (struct fpu))
      {
#ifdef FP0_REGNUM
	bcopy (fpustruct->f_fpstatus.fps_regs,
	      &registers[REGISTER_BYTE (FP0_REGNUM)],
	      sizeof fpustruct->f_fpstatus.fps_regs);
	bcopy (&fpustruct->f_fpstatus.fps_control,
	      &registers[REGISTER_BYTE (FPC_REGNUM)],
	      sizeof fpustruct->f_fpstatus - 
		sizeof fpustruct->f_fpstatus.fps_regs);
#endif
      }
    else
      fprintf (stderr, "Couldn't read float regs from core file\n");
  }
}
#else /* Not sun3 target.  */
/* These functions shouldn't be called when we're cross-debugging.  */

void
fetch_inferior_registers ()
{
}

/* ARGSUSED */
store_inferior_registers (regno)
     int regno;
{
}

/* ARGSUSED */
void
fetch_core_registers (core_reg_sect, core_reg_size, which)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
{
}
#endif /* Not sun3 target.  */