/* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
   Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.

This file is part of GDB.

GDB 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 1, or (at your option)
any later version.

GDB 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 GDB; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#if defined (GDB_TARGET_IS_MACH386)

#include <stdio.h>
#include "defs.h"
#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "signame.h"
#include "gdbcore.h"

#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>

#include <sys/ptrace.h>
#include <machine/reg.h>

#include <sys/file.h>
#include <sys/stat.h>
#include <sys/core.h>

void
fetch_inferior_registers ()
{
  struct regs inferior_registers;
  struct fp_state inferior_fp_registers;
  extern char registers[];

  registers_fetched ();

  ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
  ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);

  bcopy (&inferior_registers, registers, sizeof inferior_registers);

  bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
	 sizeof inferior_fp_registers.f_st);
  bcopy (&inferior_fp_registers.f_ctrl,
	 &registers[REGISTER_BYTE (FPC_REGNUM)],
	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
}

/* 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;
  struct fp_state inferior_fp_registers;
  extern char registers[];

  bcopy (registers, &inferior_registers, 20 * 4);

  bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
	 sizeof inferior_fp_registers.f_st);
  bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	 &inferior_fp_registers.f_ctrl,
	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  
#ifdef PTRACE_FP_BUG
  if (regno == FP_REGNUM || regno == -1)
    /* Storing the frame pointer requires a gross hack, in which an
       instruction that moves eax into ebp gets single-stepped.  */
    {
      int stack = inferior_registers.r_reg[SP_REGNUM];
      int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
      int reg = inferior_registers.r_reg[EAX];
      inferior_registers.r_reg[EAX] =
	inferior_registers.r_reg[FP_REGNUM];
      ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
      ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
      ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
      wait (0);
      ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
      inferior_registers.r_reg[EAX] = reg;
    }
#endif
  ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
  ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
}

/* Machine-dependent code which would otherwise be in core.c */
/* Work with core files, for GDB. */

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

  switch (which) {
  case 0:
  case 1:
    bcopy (core_reg_sect, registers, core_reg_size);
    break;

  case 2:
    bcopy (core_reg_sect,
	   &registers[REGISTER_BYTE (FP0_REGNUM)],
	   core_reg_size);		/* FIXME, probably bogus */
#if 0
    bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
	   &registers[REGISTER_BYTE (FPC_REGNUM)],
	   sizeof corestr.c_fpu.f_fpstatus -
	   sizeof corestr.c_fpu.f_fpstatus.f_st);
#endif
    break;
  }
}
#else /* Not mach386 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 mach386 target.  */