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/* Native dependent code for Mach 386's for GDB, the GNU debugger.

   Copyright (C) 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 "frame.h"

#include "inferior.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 "gdb_stat.h"

#include <sys/core.h>

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

void

fetch_inferior_registers (regno)

     int regno;                 /* Original value discarded */

{

  struct regs inferior_registers;

  struct fp_state inferior_fp_registers;

  registers_fetched ();

  ptrace (PTRACE_GETREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_registers);

  ptrace (PTRACE_GETFPREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_fp_registers);

  memcpy (registers, &inferior_registers, sizeof inferior_registers);

  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],

          inferior_fp_registers.f_st,

          sizeof inferior_fp_registers.f_st);

  memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],

          &inferior_fp_registers.f_ctrl,

          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).  */

void

store_inferior_registers (regno)

     int regno;

{

  struct regs inferior_registers;

  struct fp_state inferior_fp_registers;

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

  memcpy (inferior_fp_registers.f_st, &registers[REGISTER_BYTE (FP0_REGNUM)],

          sizeof inferior_fp_registers.f_st);

  memcpy (&inferior_fp_registers.f_ctrl,

          &registers[REGISTER_BYTE (FPC_REGNUM)],

          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,

                          (PTRACE_ARG3_TYPE) stack);

      int reg = inferior_registers.r_reg[EAX];

      inferior_registers.r_reg[EAX] =

        inferior_registers.r_reg[FP_REGNUM];

      ptrace (PTRACE_SETREGS, inferior_pid,

              (PTRACE_ARG3_TYPE) & inferior_registers);

      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589);

      ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0);

      wait (0);

      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff);

      inferior_registers.r_reg[EAX] = reg;

    }

#endif

  ptrace (PTRACE_SETREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_registers);

  ptrace (PTRACE_SETFPREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_fp_registers);

}

/* Work with core files, for GDB. */

static void

fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)

     char *core_reg_sect;

     unsigned core_reg_size;

     int which;

     CORE_ADDR reg_addr;        /* Unused in this version */

{

  int val;

  switch (which)

    {

    case 0:

    case 1:

      memcpy (registers, core_reg_sect, core_reg_size);

      break;

    case 2:

#ifdef FP0_REGNUM

      memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],

              core_reg_sect,

              core_reg_size);   /* FIXME, probably bogus */

#endif

#ifdef FPC_REGNUM

      memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],

              &corestr.c_fpu.f_fpstatus.f_ctrl,

              sizeof corestr.c_fpu.f_fpstatus -

              sizeof corestr.c_fpu.f_fpstatus.f_st);

#endif

      break;

    }

}

/* Register that we are able to handle i386mach core file formats.

   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns i386mach_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_i386mach ()

{

  add_core_fns (&i386mach_core_fns);

}