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/* Motorola m68k native support for Linux

   Copyright (C) 1996,1998 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 "language.h"

#include "gdbcore.h"

#ifdef USG

#include <sys/types.h>

#endif

#include <sys/param.h>

#include <sys/dir.h>

#include <signal.h>

#include <sys/user.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#include <sys/procfs.h>

#include <sys/file.h>

#include "gdb_stat.h"

#include "floatformat.h"

#include "target.h"

/* This table must line up with REGISTER_NAMES in tm-m68k.h */

static const int regmap[] =

{

  PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,

  PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,

  PT_SR, PT_PC,

  /* PT_FP0, ..., PT_FP7 */

  21, 24, 27, 30, 33, 36, 39, 42,

  /* PT_FPCR, PT_FPSR, PT_FPIAR */

  45, 46, 47

};

/* BLOCKEND is the value of u.u_ar0, and points to the place where GS

   is stored.  */

int

m68k_linux_register_u_addr (blockend, regnum)

     int blockend;

     int regnum;

{

  return (blockend + 4 * regmap[regnum]);

}

/*  Given a pointer to a general register set in /proc format (gregset_t *),

   unpack the register contents and supply them as gdb's idea of the current

   register values. */

/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions

   for supply_gregset and supply_fpregset. The definitions

   in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,

   the definitions in m68klinux-nat.c will be used. This is a

   bit of a hack. The supply_* routines do not belong in

   *_tdep.c files. But, there are several lynx ports that currently

   depend on these definitions. */

#ifndef USE_PROC_FS

void

supply_gregset (gregsetp)

     gregset_t *gregsetp;

{

  int regi;

  for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)

    supply_register (regi, (char *) (*gregsetp + regmap[regi]));

  supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));

  supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));

}

/*  Given a pointer to a floating point register set in /proc format

   (fpregset_t *), unpack the register contents and supply them as gdb's

   idea of the current floating point register values. */

void

supply_fpregset (fpregsetp)

     fpregset_t *fpregsetp;

{

  int regi;

  for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)

    supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);

  supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);

  supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);

  supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);

}

#endif

int

kernel_u_size ()

{

  return (sizeof (struct user));

}

/* Return non-zero if PC points into the signal trampoline.  */

int

in_sigtramp (pc)

     CORE_ADDR pc;

{

  CORE_ADDR sp;

  char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];

  int insn;

  sp = read_register (SP_REGNUM);

  if (pc - 2 < sp)

    return 0;

  if (read_memory_nobpt (pc, buf, sizeof (buf)))

    return 0;

  insn = extract_unsigned_integer (buf, sizeof (buf));

  if (insn == 0xdefc            /* addaw #,sp */

      || insn == 0x7077         /* moveq #119,d0 */

      || insn == 0x4e40         /* trap #0 */

      || insn == 0x203c /* movel #,d0 */ )

    return 1;

  if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))

    return 0;

  insn = extract_unsigned_integer (buf, sizeof (buf));

  if (insn == 0xdefc            /* addaw #,sp */

      || insn == 0x7077         /* moveq #119,d0 */

      || insn == 0x4e40         /* trap #0 */

      || insn == 0x203c /* movel #,d0 */ )

    return 1;

  return 0;

}