gdb/i387-tdep.h

   1 /* Target-dependent code for the i387.
   2
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2007
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #ifndef I387_TDEP_H
  24 #define I387_TDEP_H
  25
  26 struct gdbarch;
  27 struct frame_info;
  28 struct regcache;
  29 struct type;
  30 struct ui_file;
  31
  32 /* Because the number of general-purpose registers is different for
  33    AMD64, the floating-point registers and SSE registers get shifted.
  34    The following definitions are intended to help writing code that
  35    needs the register numbers of floating-point registers and SSE
  36    registers.  In order to use these, one should provide a definition
  37    for I387_ST0_REGNUM, and possibly I387_NUM_XMM_REGS, preferably by
  38    using a local "#define" in the body of the function that uses this.
  39    Please "#undef" them before the end of the function.  */
  40
  41 #define I387_FCTRL_REGNUM       (I387_ST0_REGNUM + 8)
  42 #define I387_FSTAT_REGNUM       (I387_FCTRL_REGNUM + 1)
  43 #define I387_FTAG_REGNUM        (I387_FCTRL_REGNUM + 2)
  44 #define I387_FISEG_REGNUM       (I387_FCTRL_REGNUM + 3)
  45 #define I387_FIOFF_REGNUM       (I387_FCTRL_REGNUM + 4)
  46 #define I387_FOSEG_REGNUM       (I387_FCTRL_REGNUM + 5)
  47 #define I387_FOOFF_REGNUM       (I387_FCTRL_REGNUM + 6)
  48 #define I387_FOP_REGNUM         (I387_FCTRL_REGNUM + 7)
  49 #define I387_XMM0_REGNUM        (I387_ST0_REGNUM + 16)
  50 #define I387_MXCSR_REGNUM       (I387_XMM0_REGNUM + I387_NUM_XMM_REGS)
  51 \f
  52
  53 /* Print out the i387 floating point state.  */
  54
  55 extern void i387_print_float_info (struct gdbarch *gdbarch,
  56                                    struct ui_file *file,
  57                                    struct frame_info *frame,
  58                                    const char *args);
  59
  60 /* Read a value of type TYPE from register REGNUM in frame FRAME, and
  61    return its contents in TO.  */
  62
  63 extern void i387_register_to_value (struct frame_info *frame, int regnum,
  64                                     struct type *type, gdb_byte *to);
  65
  66 /* Write the contents FROM of a value of type TYPE into register
  67    REGNUM in frame FRAME.  */
  68
  69 extern void i387_value_to_register (struct frame_info *frame, int regnum,
  70                                     struct type *type, const gdb_byte *from);
  71 \f
  72
  73 /* Size of the memory area use by the 'fsave' and 'fxsave'
  74    instructions.  */
  75 #define I387_SIZEOF_FSAVE       108
  76 #define I387_SIZEOF_FXSAVE      512
  77
  78 /* Fill register REGNUM in REGCACHE with the appropriate value from
  79    *FSAVE.  This function masks off any of the reserved bits in
  80    *FSAVE.  */
  81
  82 extern void i387_supply_fsave (struct regcache *regcache, int regnum,
  83                                const void *fsave);
  84
  85 /* Fill register REGNUM (if it is a floating-point register) in *FSAVE
  86    with the value from REGCACHE.  If REGNUM is -1, do this for all
  87    registers.  This function doesn't touch any of the reserved bits in
  88    *FSAVE.  */
  89
  90 extern void i387_collect_fsave (const struct regcache *regcache, int regnum,
  91                                 void *fsave);
  92
  93 /* Fill register REGNUM (if it is a floating-point register) in *FSAVE
  94    with the value in GDB's register cache.  If REGNUM is -1, do this
  95    for all registers.  This function doesn't touch any of the reserved
  96    bits in *FSAVE.  */
  97
  98 extern void i387_fill_fsave (void *fsave, int regnum);
  99
 100 /* Fill register REGNUM in REGCACHE with the appropriate
 101    floating-point or SSE register value from *FXSAVE.  This function
 102    masks off any of the reserved bits in *FXSAVE.  */
 103
 104 extern void i387_supply_fxsave (struct regcache *regcache, int regnum,
 105                                 const void *fxsave);
 106
 107 /* Fill register REGNUM (if it is a floating-point or SSE register) in
 108    *FXSAVE with the value from REGCACHE.  If REGNUM is -1, do this for
 109    all registers.  This function doesn't touch any of the reserved
 110    bits in *FXSAVE.  */
 111
 112 extern void i387_collect_fxsave (const struct regcache *regcache, int regnum,
 113                                  void *fxsave);
 114
 115 /* Fill register REGNUM (if it is a floating-point or SSE register) in
 116    *FXSAVE with the value in GDB's register cache.  If REGNUM is -1, do
 117    this for all registers.  This function doesn't touch any of the
 118    reserved bits in *FXSAVE.  */
 119
 120 extern void i387_fill_fxsave (void *fxsave, int regnum);
 121
 122 /* Prepare the FPU stack in REGCACHE for a function return.  */
 123
 124 extern void i387_return_value (struct gdbarch *gdbarch,
 125                                struct regcache *regcache);
 126
 127 #endif /* i387-tdep.h */