gdb/i386v4-nat.c

   1 /* Native-dependent code for Unix SVR4 running on i386's.
   2
   3    Copyright (C) 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000, 2001,
   4    2002, 2004, 2007 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 #include "defs.h"
  24 #include "value.h"
  25 #include "inferior.h"
  26 #include "regcache.h"
  27
  28 #ifdef HAVE_SYS_REG_H
  29 #include <sys/reg.h>
  30 #endif
  31
  32 #include "i386-tdep.h"
  33 #include "i387-tdep.h"
  34
  35 #ifdef HAVE_SYS_PROCFS_H
  36
  37 #include <sys/procfs.h>
  38
  39 /* We must not compile this code for 64-bit Solaris x86.  */
  40 #if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
  41
  42 #include "gregset.h"
  43
  44 /* The `/proc' interface divides the target machine's register set up
  45    into two different sets, the general purpose register set (gregset)
  46    and the floating-point register set (fpregset).  For each set,
  47    there is an ioctl to get the current register set and another ioctl
  48    to set the current values.
  49
  50    The actual structure passed through the ioctl interface is, of
  51    course, naturally machine dependent, and is different for each set
  52    of registers.  For the i386 for example, the general-purpose
  53    register set is typically defined by:
  54
  55    typedef int gregset_t[19];           (in <sys/regset.h>)
  56
  57    #define GS   0                       (in <sys/reg.h>)
  58    #define FS   1
  59    ...
  60    #define UESP 17
  61    #define SS   18
  62
  63    and the floating-point set by:
  64
  65    typedef struct fpregset   {
  66            union {
  67                    struct fpchip_state            // fp extension state //
  68                    {
  69                            int     state[27];     // 287/387 saved state //
  70                            int     status;        // status word saved at //
  71                                                   // exception //
  72                    } fpchip_state;
  73                    struct fp_emul_space           // for emulators //
  74                    {
  75                            char    fp_emul[246];
  76                            char    fp_epad[2];
  77                    } fp_emul_space;
  78                    int     f_fpregs[62];          // union of the above //
  79            } fp_reg_set;
  80            long            f_wregs[33];           // saved weitek state //
  81    } fpregset_t;
  82
  83    Incidentally fpchip_state contains the FPU state in the same format
  84    as used by the "fsave" instruction, and that's the only thing we
  85    support here.  I don't know how the emulator stores it state.  The
  86    Weitek stuff definitely isn't supported.
  87
  88    The routines defined here, provide the packing and unpacking of
  89    gregset_t and fpregset_t formatted data.  */
  90
  91 #ifdef HAVE_GREGSET_T
  92
  93 /* Mapping between the general-purpose registers in `/proc'
  94    format and GDB's register array layout.  */
  95 static int regmap[] =
  96 {
  97   EAX, ECX, EDX, EBX,
  98   UESP, EBP, ESI, EDI,
  99   EIP, EFL, CS, SS,
 100   DS, ES, FS, GS
 101 };
 102
 103 /* Fill GDB's register array with the general-purpose register values
 104    in *GREGSETP.  */
 105
 106 void
 107 supply_gregset (gregset_t *gregsetp)
 108 {
 109   greg_t *regp = (greg_t *) gregsetp;
 110   int regnum;
 111
 112   for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
 113     regcache_raw_supply (current_regcache, regnum, regp + regmap[regnum]);
 114 }
 115
 116 /* Fill register REGNUM (if it is a general-purpose register) in
 117    *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
 118    do this for all registers.  */
 119
 120 void
 121 fill_gregset (gregset_t *gregsetp, int regnum)
 122 {
 123   greg_t *regp = (greg_t *) gregsetp;
 124   int i;
 125
 126   for (i = 0; i < I386_NUM_GREGS; i++)
 127     if (regnum == -1 || regnum == i)
 128       regcache_raw_collect (current_regcache, i, regp + regmap[i]);
 129 }
 130
 131 #endif /* HAVE_GREGSET_T */
 132
 133 #ifdef HAVE_FPREGSET_T
 134
 135 /* Fill GDB's register array with the floating-point register values in
 136    *FPREGSETP.  */
 137
 138 void
 139 supply_fpregset (fpregset_t *fpregsetp)
 140 {
 141   if (FP0_REGNUM == 0)
 142     return;
 143
 144   i387_supply_fsave (current_regcache, -1, fpregsetp);
 145 }
 146
 147 /* Fill register REGNO (if it is a floating-point register) in
 148    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 149    do this for all registers.  */
 150
 151 void
 152 fill_fpregset (fpregset_t *fpregsetp, int regno)
 153 {
 154   if (FP0_REGNUM == 0)
 155     return;
 156
 157   i387_fill_fsave ((char *) fpregsetp, regno);
 158 }
 159
 160 #endif /* HAVE_FPREGSET_T */
 161
 162 #endif /* not 64-bit.  */
 163
 164 #endif /* HAVE_SYS_PROCFS_H */