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/* Target-dependent code for the i387.

   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2007, 2008

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#ifndef I387_TDEP_H

#define I387_TDEP_H

struct gdbarch;

struct frame_info;

struct regcache;

struct type;

struct ui_file;

/* Because the number of general-purpose registers is different for

   AMD64, the floating-point registers and SSE registers get shifted.

   The following definitions are intended to help writing code that

   needs the register numbers of floating-point registers and SSE

   registers.  In order to use these, one should provide a definition

   for I387_ST0_REGNUM, and possibly I387_NUM_XMM_REGS, preferably by

   using a local "#define" in the body of the function that uses this.

   Please "#undef" them before the end of the function.  */

#define I387_FCTRL_REGNUM       (I387_ST0_REGNUM + 8)

#define I387_FSTAT_REGNUM       (I387_FCTRL_REGNUM + 1)

#define I387_FTAG_REGNUM        (I387_FCTRL_REGNUM + 2)

#define I387_FISEG_REGNUM       (I387_FCTRL_REGNUM + 3)

#define I387_FIOFF_REGNUM       (I387_FCTRL_REGNUM + 4)

#define I387_FOSEG_REGNUM       (I387_FCTRL_REGNUM + 5)

#define I387_FOOFF_REGNUM       (I387_FCTRL_REGNUM + 6)

#define I387_FOP_REGNUM         (I387_FCTRL_REGNUM + 7)

#define I387_XMM0_REGNUM        (I387_ST0_REGNUM + 16)

#define I387_MXCSR_REGNUM       (I387_XMM0_REGNUM + I387_NUM_XMM_REGS)

/* Print out the i387 floating point state.  */

extern void i387_print_float_info (struct gdbarch *gdbarch,

                                   struct ui_file *file,

                                   struct frame_info *frame,

                                   const char *args);

/* Return nonzero if a value of type TYPE stored in register REGNUM

   needs any special handling.  */

extern int i387_convert_register_p (struct gdbarch *gdbarch, int regnum,

                                    struct type *type);

/* Read a value of type TYPE from register REGNUM in frame FRAME, and

   return its contents in TO.  */

extern void i387_register_to_value (struct frame_info *frame, int regnum,

                                    struct type *type, gdb_byte *to);

/* Write the contents FROM of a value of type TYPE into register

   REGNUM in frame FRAME.  */

extern void i387_value_to_register (struct frame_info *frame, int regnum,

                                    struct type *type, const gdb_byte *from);

/* Size of the memory area use by the 'fsave' and 'fxsave'

   instructions.  */

#define I387_SIZEOF_FSAVE       108

#define I387_SIZEOF_FXSAVE      512

/* Fill register REGNUM in REGCACHE with the appropriate value from

   *FSAVE.  This function masks off any of the reserved bits in

   *FSAVE.  */

extern void i387_supply_fsave (struct regcache *regcache, int regnum,

                               const void *fsave);

/* Fill register REGNUM (if it is a floating-point register) in *FSAVE

   with the value from REGCACHE.  If REGNUM is -1, do this for all

   registers.  This function doesn't touch any of the reserved bits in

   *FSAVE.  */

extern void i387_collect_fsave (const struct regcache *regcache, int regnum,

                                void *fsave);

/* Fill register REGNUM in REGCACHE with the appropriate

   floating-point or SSE register value from *FXSAVE.  This function

   masks off any of the reserved bits in *FXSAVE.  */

extern void i387_supply_fxsave (struct regcache *regcache, int regnum,

                                const void *fxsave);

/* Fill register REGNUM (if it is a floating-point or SSE register) in

   *FXSAVE with the value from REGCACHE.  If REGNUM is -1, do this for

   all registers.  This function doesn't touch any of the reserved

   bits in *FXSAVE.  */

extern void i387_collect_fxsave (const struct regcache *regcache, int regnum,

                                 void *fxsave);

/* Prepare the FPU stack in REGCACHE for a function return.  */

extern void i387_return_value (struct gdbarch *gdbarch,

                               struct regcache *regcache);

#endif /* i387-tdep.h */