/* Host-dependent code for Sun-3 for GDB, the GNU debugger.
   Copyright 1986, 1987, 1989, 1991, 1992 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, 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>

static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);

void
fetch_inferior_registers (int regno)
{
  struct regs inferior_registers;
  struct fp_status inferior_fp_registers;

  registers_fetched ();

  ptrace (PTRACE_GETREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) & inferior_registers);

  if (FP0_REGNUM >= 0)
    ptrace (PTRACE_GETFPREGS, inferior_pid,
	    (PTRACE_ARG3_TYPE) & inferior_fp_registers);

  memcpy (registers, &inferior_registers, 16 * 4);
  if (FP0_REGNUM >= 0)
    memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
	    sizeof inferior_fp_registers.fps_regs);

  *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  if (FP0_REGNUM >= 0)
    memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	    &inferior_fp_registers.fps_control,
	    sizeof inferior_fp_registers - 
	    sizeof inferior_fp_registers.fps_regs);
}

/* 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).  */

void
store_inferior_registers (int regno)
{
  struct regs inferior_registers;
  struct fp_status inferior_fp_registers;

  memcpy (&inferior_registers, registers, 16 * 4);
  if (FP0_REGNUM >= 0)
    memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
	    sizeof inferior_fp_registers.fps_regs);

  inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
  inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];

  if (FP0_REGNUM >= 0)
    memcpy (&inferior_fp_registers.fps_control,
	    &registers[REGISTER_BYTE (FPC_REGNUM)],
	    sizeof inferior_fp_registers - 
	    sizeof inferior_fp_registers.fps_regs);

  ptrace (PTRACE_SETREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) & inferior_registers);
  if (FP0_REGNUM >= 0)
    ptrace (PTRACE_SETFPREGS, inferior_pid,
	    (PTRACE_ARG3_TYPE) & inferior_fp_registers);
}


/* All of this stuff is only relevant if both host and target are sun3.  */

/* Provide registers to GDB from a core file.

   CORE_REG_SECT points to an array of bytes, which were obtained from
   a core file which BFD thinks might contain register contents. 
   CORE_REG_SIZE is its size.

   WHICH says which register set corelow suspects this is:
     0 --- the general-purpose register set
     2 --- the floating-point register set

   REG_ADDR isn't used.  */

static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
		      int which, CORE_ADDR reg_addr)
{
  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");

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

    }
  else if (which == 2)
    {

#define fpustruct  ((struct fpu *) core_reg_sect)

      if (core_reg_size >= sizeof (struct fpu))
	{
	  if (FP0_REGNUM >= 0)
	    {
	      memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
		      fpustruct->f_fpstatus.fps_regs,
		      sizeof fpustruct->f_fpstatus.fps_regs);
	      memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
		      &fpustruct->f_fpstatus.fps_control,
		      sizeof fpustruct->f_fpstatus -
		      sizeof fpustruct->f_fpstatus.fps_regs);
	    }
	}
      else
	fprintf_unfiltered (gdb_stderr, 
			    "Couldn't read float regs from core file\n");
    }
}


/* Register that we are able to handle sun3 core file formats.
   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns sun3_core_fns =
{
  bfd_target_unknown_flavour,		/* core_flavour */
  default_check_format,			/* check_format */
  default_core_sniffer,			/* core_sniffer */
  fetch_core_registers,			/* core_read_registers */
  NULL					/* next */
};

void
_initialize_core_sun3 (void)
{
  add_core_fns (&sun3_core_fns);
}
