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[/] [scarts/] [trunk/] [toolchain/] [scarts-gdb/] [gdb-6.8/] [gdb/] [i386v4-nat.c] - Blame information for rev 25

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1 25 jlechner
/* Native-dependent code for Unix SVR4 running on i386's.
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   Copyright (C) 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000, 2001,
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   2002, 2004, 2007, 2008 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "value.h"
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#include "inferior.h"
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#include "regcache.h"
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#ifdef HAVE_SYS_PROCFS_H
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#include <sys/procfs.h>
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/* We must not compile this code for 64-bit Solaris x86.  */
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#if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
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#include "gregset.h"
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/* The `/proc' interface divides the target machine's register set up
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   into two different sets, the general purpose register set (gregset)
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   and the floating-point register set (fpregset).  For each set,
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   there is an ioctl to get the current register set and another ioctl
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   to set the current values.
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   The actual structure passed through the ioctl interface is, of
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   course, naturally machine dependent, and is different for each set
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   of registers.  For the i386 for example, the general-purpose
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   register set is typically defined by:
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   typedef int gregset_t[19];           (in <sys/regset.h>)
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   #define GS   0                       (in <sys/reg.h>)
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   #define FS   1
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   ...
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   #define UESP 17
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   #define SS   18
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   and the floating-point set by:
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   typedef struct fpregset   {
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           union {
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                   struct fpchip_state            // fp extension state //
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                   {
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                           int     state[27];     // 287/387 saved state //
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                           int     status;        // status word saved at //
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                                                  // exception //
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                   } fpchip_state;
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                   struct fp_emul_space           // for emulators //
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                   {
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                           char    fp_emul[246];
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                           char    fp_epad[2];
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                   } fp_emul_space;
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                   int     f_fpregs[62];          // union of the above //
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           } fp_reg_set;
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           long            f_wregs[33];           // saved weitek state //
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   } fpregset_t;
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   Incidentally fpchip_state contains the FPU state in the same format
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   as used by the "fsave" instruction, and that's the only thing we
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   support here.  I don't know how the emulator stores it state.  The
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   Weitek stuff definitely isn't supported.
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   The routines defined here, provide the packing and unpacking of
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   gregset_t and fpregset_t formatted data.  */
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#ifdef HAVE_GREGSET_T
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/* Mapping between the general-purpose registers in `/proc'
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   format and GDB's register array layout.  */
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static int regmap[] =
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{
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  EAX, ECX, EDX, EBX,
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  UESP, EBP, ESI, EDI,
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  EIP, EFL, CS, SS,
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  DS, ES, FS, GS
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};
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/* Fill GDB's register array with the general-purpose register values
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   in *GREGSETP.  */
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void
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supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
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{
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  const greg_t *regp = (const greg_t *) gregsetp;
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  int regnum;
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  for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
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    regcache_raw_supply (regcache, regnum, regp + regmap[regnum]);
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}
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/* Fill register REGNUM (if it is a general-purpose register) in
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   *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
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   do this for all registers.  */
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void
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fill_gregset (const struct regcache *regcache,
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              gregset_t *gregsetp, int regnum)
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{
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  greg_t *regp = (greg_t *) gregsetp;
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  int i;
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  for (i = 0; i < I386_NUM_GREGS; i++)
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    if (regnum == -1 || regnum == i)
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      regcache_raw_collect (regcache, i, regp + regmap[i]);
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}
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#endif /* HAVE_GREGSET_T */
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#ifdef HAVE_FPREGSET_T
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/* Fill GDB's register array with the floating-point register values in
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   *FPREGSETP.  */
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void
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supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
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{
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  if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
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    return;
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  i387_supply_fsave (regcache, -1, fpregsetp);
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}
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/* Fill register REGNO (if it is a floating-point register) in
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   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
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   do this for all registers.  */
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void
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fill_fpregset (const struct regcache *regcache,
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               fpregset_t *fpregsetp, int regno)
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{
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  if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
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    return;
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  i387_collect_fsave (regcache, regno, fpregsetp);
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}
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#endif /* HAVE_FPREGSET_T */
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#endif /* not 64-bit.  */
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#endif /* HAVE_SYS_PROCFS_H */

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