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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef I387_TDEP_H
  22 #define I387_TDEP_H
  23
  24 struct gdbarch;
  25 struct frame_info;
  26 struct regcache;
  27 struct type;
  28 struct ui_file;
  29
  30 /* Because the number of general-purpose registers is different for
  31    AMD64, the floating-point registers and SSE registers get shifted.
  32    The following definitions are intended to help writing code that
  33    needs the register numbers of floating-point registers and SSE
  34    registers.  In order to use these, one should provide a definition
  35    for I387_ST0_REGNUM, and possibly I387_NUM_XMM_REGS, preferably by
  36    using a local "#define" in the body of the function that uses this.
  37    Please "#undef" them before the end of the function.  */
  38
  39 #define I387_FCTRL_REGNUM       (I387_ST0_REGNUM + 8)
  40 #define I387_FSTAT_REGNUM       (I387_FCTRL_REGNUM + 1)
  41 #define I387_FTAG_REGNUM        (I387_FCTRL_REGNUM + 2)
  42 #define I387_FISEG_REGNUM       (I387_FCTRL_REGNUM + 3)
  43 #define I387_FIOFF_REGNUM       (I387_FCTRL_REGNUM + 4)
  44 #define I387_FOSEG_REGNUM       (I387_FCTRL_REGNUM + 5)
  45 #define I387_FOOFF_REGNUM       (I387_FCTRL_REGNUM + 6)
  46 #define I387_FOP_REGNUM         (I387_FCTRL_REGNUM + 7)
  47 #define I387_XMM0_REGNUM        (I387_ST0_REGNUM + 16)
  48 #define I387_MXCSR_REGNUM       (I387_XMM0_REGNUM + I387_NUM_XMM_REGS)
  49 \f
  50
  51 /* Print out the i387 floating point state.  */
  52
  53 extern void i387_print_float_info (struct gdbarch *gdbarch,
  54                                    struct ui_file *file,
  55                                    struct frame_info *frame,
  56                                    const char *args);
  57
  58 /* Return nonzero if a value of type TYPE stored in register REGNUM
  59    needs any special handling.  */
  60
  61 extern int i387_convert_register_p (struct gdbarch *gdbarch, int regnum,
  62                                     struct type *type);
  63
  64 /* Read a value of type TYPE from register REGNUM in frame FRAME, and
  65    return its contents in TO.  */
  66
  67 extern void i387_register_to_value (struct frame_info *frame, int regnum,
  68                                     struct type *type, gdb_byte *to);
  69
  70 /* Write the contents FROM of a value of type TYPE into register
  71    REGNUM in frame FRAME.  */
  72
  73 extern void i387_value_to_register (struct frame_info *frame, int regnum,
  74                                     struct type *type, const gdb_byte *from);
  75 \f
  76
  77 /* Size of the memory area use by the 'fsave' and 'fxsave'
  78    instructions.  */
  79 #define I387_SIZEOF_FSAVE       108
  80 #define I387_SIZEOF_FXSAVE      512
  81
  82 /* Fill register REGNUM in REGCACHE with the appropriate value from
  83    *FSAVE.  This function masks off any of the reserved bits in
  84    *FSAVE.  */
  85
  86 extern void i387_supply_fsave (struct regcache *regcache, int regnum,
  87                                const void *fsave);
  88
  89 /* Fill register REGNUM (if it is a floating-point register) in *FSAVE
  90    with the value from REGCACHE.  If REGNUM is -1, do this for all
  91    registers.  This function doesn't touch any of the reserved bits in
  92    *FSAVE.  */
  93
  94 extern void i387_collect_fsave (const struct regcache *regcache, int regnum,
  95                                 void *fsave);
  96
  97 /* Fill register REGNUM in REGCACHE with the appropriate
  98    floating-point or SSE register value from *FXSAVE.  This function
  99    masks off any of the reserved bits in *FXSAVE.  */
 100
 101 extern void i387_supply_fxsave (struct regcache *regcache, int regnum,
 102                                 const void *fxsave);
 103
 104 /* Fill register REGNUM (if it is a floating-point or SSE register) in
 105    *FXSAVE with the value from REGCACHE.  If REGNUM is -1, do this for
 106    all registers.  This function doesn't touch any of the reserved
 107    bits in *FXSAVE.  */
 108
 109 extern void i387_collect_fxsave (const struct regcache *regcache, int regnum,
 110                                  void *fxsave);
 111
 112 /* Prepare the FPU stack in REGCACHE for a function return.  */
 113
 114 extern void i387_return_value (struct gdbarch *gdbarch,
 115                                struct regcache *regcache);
 116
 117 #endif /* i387-tdep.h */