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/* Native-dependent code for SVR4 Unix running on i386's, for GDB.

   Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000, 2001

   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 "value.h"

#include "inferior.h"

#include "regcache.h"

#ifdef HAVE_SYS_REG_H

#include <sys/reg.h>

#endif

#ifdef HAVE_SYS_PROCFS_H

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc. */

#include "gregset.h"

/*  The /proc interface divides the target machine's register set up into

   two different sets, the general register set (gregset) and the floating

   point register set (fpregset).  For each set, there is an ioctl to get

   the current register set and another ioctl to set the current values.

   The actual structure passed through the ioctl interface is, of course,

   naturally machine dependent, and is different for each set of registers.

   For the i386 for example, the general register set is typically defined

   by:

   typedef int gregset_t[19];           (in <sys/regset.h>)

   #define GS   0                       (in <sys/reg.h>)

   #define FS   1

   ...

   #define UESP 17

   #define SS   18

   and the floating point set by:

   typedef struct fpregset

   {

   union

   {

   struct fpchip_state  // fp extension state //

   {

   int state[27];       // 287/387 saved state //

   int status;          // status word saved at exception //

   } fpchip_state;

   struct fp_emul_space // for emulators //

   {

   char fp_emul[246];

   char fp_epad[2];

   } fp_emul_space;

   int f_fpregs[62];    // union of the above //

   } fp_reg_set;

   long f_wregs[33];            // saved weitek state //

   } fpregset_t;

   These routines provide the packing and unpacking of gregset_t and

   fpregset_t formatted data.

 */

#ifdef HAVE_GREGSET_T

/* This is a duplicate of the table in i386-xdep.c. */

static int regmap[] =

{

  EAX, ECX, EDX, EBX,

  UESP, EBP, ESI, EDI,

  EIP, EFL, CS, SS,

  DS, ES, FS, GS,

};

/* Prototypes for local functions */

void fill_gregset (gregset_t *, int);

void supply_gregset (gregset_t *);

void supply_fpregset (fpregset_t *);

void fill_fpregset (fpregset_t *, int);

/*  FIXME:  These routine absolutely depends upon (NUM_REGS - NUM_FREGS)

   being less than or equal to the number of registers that can be stored

   in a gregset_t.  Note that with the current scheme there will typically

   be more registers actually stored in a gregset_t that what we know

   about.  This is bogus and should be fixed. */

/*  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. */

void

supply_gregset (gregset_t *gregsetp)

{

  register int regi;

  register greg_t *regp = (greg_t *) gregsetp;

  extern int regmap[];

  for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)

    {

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

    }

}

void

fill_gregset (gregset_t *gregsetp, int regno)

{

  int regi;

  register greg_t *regp = (greg_t *) gregsetp;

  extern int regmap[];

  for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)

    {

      if ((regno == -1) || (regno == regi))

        {

          *(regp + regmap[regi]) = *(int *) &registers[REGISTER_BYTE (regi)];

        }

    }

}

#endif /* HAVE_GREGSET_T */

#if defined (HAVE_FPREGSET_T)

/*  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. */

/* FIXME: Assumes that fpregsetp contains an i387 FSAVE area. */

static const int freg_offset_map[] =

{

#if !defined(FPREGSET_FSAVE_OFFSET)

#define FPREGSET_FSAVE_OFFSET   0

#endif

  FPREGSET_FSAVE_OFFSET + 28 + 0 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 1 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 2 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 3 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 4 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 5 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 6 * 10,

  FPREGSET_FSAVE_OFFSET + 28 + 7 * 10,

  FPREGSET_FSAVE_OFFSET + 0,

  FPREGSET_FSAVE_OFFSET + 4,

  FPREGSET_FSAVE_OFFSET + 8,

  FPREGSET_FSAVE_OFFSET + 16,

  FPREGSET_FSAVE_OFFSET + 12,

  FPREGSET_FSAVE_OFFSET + 24,

  FPREGSET_FSAVE_OFFSET + 20,

  FPREGSET_FSAVE_OFFSET + 16

};

void

supply_fpregset (fpregset_t *fpregsetp)

{

  int regi;

  if (NUM_FREGS == 0)

    return;

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

    {

      char tbuf[4];

      ULONGEST tval;

      char *from = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];

      if (regi == FCS_REGNUM)

        {

          tval = extract_unsigned_integer (from, 4) & 0xffff;

          store_unsigned_integer (tbuf, 4, tval);

          supply_register (regi, tbuf);

        }

      else if (regi == FOP_REGNUM)

        {

          tval = (extract_unsigned_integer (from, 4) >> 16) & ((1 << 11) - 1);

          store_unsigned_integer (tbuf, 4, tval);

          supply_register (regi, tbuf);

        }

      else

        supply_register (regi, from);

    }

}

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

   (fpregset_t *), update the register specified by REGNO from gdb's idea

   of the current floating point register set.  If REGNO is -1, update

   them all. */

void

fill_fpregset (fpregset_t *fpregsetp, int regno)

{

  int regi;

  if (NUM_FREGS == 0)

    return;

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

    {

      if ((regno == -1) || (regno == regi))

        {

          char *to = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];

          char *from = (char *) &registers[REGISTER_BYTE (regi)];

          ULONGEST valto;

          ULONGEST valfrom;

          if (regi == FCS_REGNUM)

            {

              valto = extract_unsigned_integer (to, 4);

              valfrom = extract_unsigned_integer (from, 4);

              valto = (valto & ~0xffff) | (valfrom & 0xffff);

              store_unsigned_integer (to, 4, valto);

            }

          else if (regi == FOP_REGNUM)

            {

              valto = extract_unsigned_integer (to, 4);

              valfrom = extract_unsigned_integer (from, 4);

              valto = (valto & 0xffff) | ((valfrom & ((1 << 11) - 1)) << 16);

              store_unsigned_integer (to, 4, valto);

            }

          else

            {

              memcpy (to, from, REGISTER_RAW_SIZE (regi));

            }

        }

    }

}

#endif /* defined (HAVE_FPREGSET_T) */

#endif /* HAVE_SYS_PROCFS_H */