gdb/i387-tdep.h

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