gdb/i386v4-nat.c

   1 /* Native-dependent code for Unix SVR4 running on i386's.
   2
   3    Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000,
   4    2001, 2002, 2004
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #include "defs.h"
  25 #include "value.h"
  26 #include "inferior.h"
  27 #include "regcache.h"
  28
  29 #ifdef HAVE_SYS_REG_H
  30 #include <sys/reg.h>
  31 #endif
  32
  33 #include "i386-tdep.h"
  34 #include "i387-tdep.h"
  35
  36 #ifdef HAVE_SYS_PROCFS_H
  37
  38 #include <sys/procfs.h>
  39
  40 /* We must not compile this code for 64-bit Solaris x86.  */
  41 #if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
  42
  43 #include "gregset.h"
  44
  45 /* The `/proc' interface divides the target machine's register set up
  46    into two different sets, the general purpose register set (gregset)
  47    and the floating-point register set (fpregset).  For each set,
  48    there is an ioctl to get the current register set and another ioctl
  49    to set the current values.
  50
  51    The actual structure passed through the ioctl interface is, of
  52    course, naturally machine dependent, and is different for each set
  53    of registers.  For the i386 for example, the general-purpose
  54    register set is typically defined by:
  55
  56    typedef int gregset_t[19];           (in <sys/regset.h>)
  57
  58    #define GS   0                       (in <sys/reg.h>)
  59    #define FS   1
  60    ...
  61    #define UESP 17
  62    #define SS   18
  63
  64    and the floating-point set by:
  65
  66    typedef struct fpregset   {
  67            union {
  68                    struct fpchip_state            // fp extension state //
  69                    {
  70                            int     state[27];     // 287/387 saved state //
  71                            int     status;        // status word saved at //
  72                                                   // exception //
  73                    } fpchip_state;
  74                    struct fp_emul_space           // for emulators //
  75                    {
  76                            char    fp_emul[246];
  77                            char    fp_epad[2];
  78                    } fp_emul_space;
  79                    int     f_fpregs[62];          // union of the above //
  80            } fp_reg_set;
  81            long            f_wregs[33];           // saved weitek state //
  82    } fpregset_t;
  83
  84    Incidentally fpchip_state contains the FPU state in the same format
  85    as used by the "fsave" instruction, and that's the only thing we
  86    support here.  I don't know how the emulator stores it state.  The
  87    Weitek stuff definitely isn't supported.
  88
  89    The routines defined here, provide the packing and unpacking of
  90    gregset_t and fpregset_t formatted data.  */
  91
  92 #ifdef HAVE_GREGSET_T
  93
  94 /* Mapping between the general-purpose registers in `/proc'
  95    format and GDB's register array layout.  */
  96 static int regmap[] =
  97 {
  98   EAX, ECX, EDX, EBX,
  99   UESP, EBP, ESI, EDI,
 100   EIP, EFL, CS, SS,
 101   DS, ES, FS, GS
 102 };
 103
 104 /* Fill GDB's register array with the general-purpose register values
 105    in *GREGSETP.  */
 106
 107 void
 108 supply_gregset (gregset_t *gregsetp)
 109 {
 110   greg_t *regp = (greg_t *) gregsetp;
 111   int regnum;
 112
 113   for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
 114     regcache_raw_supply (current_regcache, regnum, regp + regmap[regnum]);
 115 }
 116
 117 /* Fill register REGNUM (if it is a general-purpose register) in
 118    *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
 119    do this for all registers.  */
 120
 121 void
 122 fill_gregset (gregset_t *gregsetp, int regnum)
 123 {
 124   greg_t *regp = (greg_t *) gregsetp;
 125   int i;
 126
 127   for (i = 0; i < I386_NUM_GREGS; i++)
 128     if (regnum == -1 || regnum == i)
 129       regcache_raw_collect (current_regcache, i, regp + regmap[i]);
 130 }
 131
 132 #endif /* HAVE_GREGSET_T */
 133
 134 #ifdef HAVE_FPREGSET_T
 135
 136 /* Fill GDB's register array with the floating-point register values in
 137    *FPREGSETP.  */
 138
 139 void
 140 supply_fpregset (fpregset_t *fpregsetp)
 141 {
 142   if (FP0_REGNUM == 0)
 143     return;
 144
 145   i387_supply_fsave (current_regcache, -1, fpregsetp);
 146 }
 147
 148 /* Fill register REGNO (if it is a floating-point register) in
 149    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 150    do this for all registers.  */
 151
 152 void
 153 fill_fpregset (fpregset_t *fpregsetp, int regno)
 154 {
 155   if (FP0_REGNUM == 0)
 156     return;
 157
 158   i387_fill_fsave ((char *) fpregsetp, regno);
 159 }
 160
 161 #endif /* HAVE_FPREGSET_T */
 162
 163 #endif /* not 64-bit.  */
 164
 165 #endif /* HAVE_SYS_PROCFS_H */