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, 2008, 2009, 2010, 2011 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 #include "defs.h"
  22 #include "value.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25
  26 #ifdef HAVE_SYS_REG_H
  27 #include <sys/reg.h>
  28 #endif
  29
  30 #include "i386-tdep.h"
  31 #include "i387-tdep.h"
  32
  33 #ifdef HAVE_SYS_PROCFS_H
  34
  35 #include <sys/procfs.h>
  36
  37 /* We must not compile this code for 64-bit Solaris x86.  */
  38 #if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
  39
  40 #include "gregset.h"
  41
  42 /* The `/proc' interface divides the target machine's register set up
  43    into two different sets, the general purpose register set (gregset)
  44    and the floating-point register set (fpregset).  For each set,
  45    there is an ioctl to get the current register set and another ioctl
  46    to set the current values.
  47
  48    The actual structure passed through the ioctl interface is, of
  49    course, naturally machine dependent, and is different for each set
  50    of registers.  For the i386 for example, the general-purpose
  51    register set is typically defined by:
  52
  53    typedef int gregset_t[19];           (in <sys/regset.h>)
  54
  55    #define GS   0                       (in <sys/reg.h>)
  56    #define FS   1
  57    ...
  58    #define UESP 17
  59    #define SS   18
  60
  61    and the floating-point set by:
  62
  63    typedef struct fpregset   {
  64            union {
  65                    struct fpchip_state            // fp extension state //
  66                    {
  67                            int     state[27];     // 287/387 saved state //
  68                            int     status;        // status word saved at //
  69                                                   // exception //
  70                    } fpchip_state;
  71                    struct fp_emul_space           // for emulators //
  72                    {
  73                            char    fp_emul[246];
  74                            char    fp_epad[2];
  75                    } fp_emul_space;
  76                    int     f_fpregs[62];          // union of the above //
  77            } fp_reg_set;
  78            long            f_wregs[33];           // saved weitek state //
  79    } fpregset_t;
  80
  81    Incidentally fpchip_state contains the FPU state in the same format
  82    as used by the "fsave" instruction, and that's the only thing we
  83    support here.  I don't know how the emulator stores it state.  The
  84    Weitek stuff definitely isn't supported.
  85
  86    The routines defined here, provide the packing and unpacking of
  87    gregset_t and fpregset_t formatted data.  */
  88
  89 #ifdef HAVE_GREGSET_T
  90
  91 /* Mapping between the general-purpose registers in `/proc'
  92    format and GDB's register array layout.  */
  93 static int regmap[] =
  94 {
  95   EAX, ECX, EDX, EBX,
  96   UESP, EBP, ESI, EDI,
  97   EIP, EFL, CS, SS,
  98   DS, ES, FS, GS
  99 };
 100
 101 /* Fill GDB's register array with the general-purpose register values
 102    in *GREGSETP.  */
 103
 104 void
 105 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
 106 {
 107   const greg_t *regp = (const greg_t *) gregsetp;
 108   int regnum;
 109
 110   for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
 111     regcache_raw_supply (regcache, regnum, regp + regmap[regnum]);
 112 }
 113
 114 /* Fill register REGNUM (if it is a general-purpose register) in
 115    *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
 116    do this for all registers.  */
 117
 118 void
 119 fill_gregset (const struct regcache *regcache,
 120               gregset_t *gregsetp, int regnum)
 121 {
 122   greg_t *regp = (greg_t *) gregsetp;
 123   int i;
 124
 125   for (i = 0; i < I386_NUM_GREGS; i++)
 126     if (regnum == -1 || regnum == i)
 127       regcache_raw_collect (regcache, i, regp + regmap[i]);
 128 }
 129
 130 #endif /* HAVE_GREGSET_T */
 131
 132 #ifdef HAVE_FPREGSET_T
 133
 134 /* Fill GDB's register array with the floating-point register values in
 135    *FPREGSETP.  */
 136
 137 void
 138 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 139 {
 140   if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
 141     return;
 142
 143   i387_supply_fsave (regcache, -1, fpregsetp);
 144 }
 145
 146 /* Fill register REGNO (if it is a floating-point register) in
 147    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 148    do this for all registers.  */
 149
 150 void
 151 fill_fpregset (const struct regcache *regcache,
 152                fpregset_t *fpregsetp, int regno)
 153 {
 154   if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
 155     return;
 156
 157   i387_collect_fsave (regcache, regno, fpregsetp);
 158 }
 159
 160 #endif /* HAVE_FPREGSET_T */
 161
 162 #endif /* not 64-bit.  */
 163
 164 #endif /* HAVE_SYS_PROCFS_H */