gdb/i386v4-nat.c

   1 /* Native-dependent code for SVR4 Unix running on i386's, for GDB.
   2    Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include <sys/procfs.h>
  22
  23 /*  The /proc interface divides the target machine's register set up into
  24     two different sets, the general register set (gregset) and the floating
  25     point register set (fpregset).  For each set, there is an ioctl to get
  26     the current register set and another ioctl to set the current values.
  27
  28     The actual structure passed through the ioctl interface is, of course,
  29     naturally machine dependent, and is different for each set of registers.
  30     For the i386 for example, the general register set is typically defined
  31     by:
  32
  33         typedef int gregset_t[19];              (in <sys/regset.h>)
  34
  35         #define GS      0                       (in <sys/reg.h>)
  36         #define FS      1
  37         ...
  38         #define UESP    17
  39         #define SS      18
  40
  41     and the floating point set by:
  42
  43         typedef struct fpregset
  44           {
  45             union
  46               {
  47                 struct fpchip_state     // fp extension state //
  48                 {
  49                   int state[27];        // 287/387 saved state //
  50                   int status;           // status word saved at exception //
  51                 } fpchip_state;
  52                 struct fp_emul_space    // for emulators //
  53                 {
  54                   char fp_emul[246];
  55                   char fp_epad[2];
  56                 } fp_emul_space;
  57                 int f_fpregs[62];       // union of the above //
  58               } fp_reg_set;
  59             long f_wregs[33];           // saved weitek state //
  60         } fpregset_t;
  61
  62     These routines provide the packing and unpacking of gregset_t and
  63     fpregset_t formatted data.
  64
  65  */
  66
  67 /* This is a duplicate of the table in i386-xdep.c. */
  68
  69 static int regmap[] =
  70 {
  71   EAX, ECX, EDX, EBX,
  72   UESP, EBP, ESI, EDI,
  73   EIP, EFL, CS, SS,
  74   DS, ES, FS, GS,
  75 };
  76
  77
  78 /*  Given a pointer to a general register set in /proc format (gregset_t *),
  79     unpack the register contents and supply them as gdb's idea of the current
  80     register values. */
  81
  82 void
  83 supply_gregset (gregsetp)
  84      gregset_t *gregsetp;
  85 {
  86   register int regi;
  87   register greg_t *regp = (greg_t *) gregsetp;
  88   extern int regmap[];
  89
  90   for (regi = 0 ; regi < NUM_REGS ; regi++)
  91     {
  92       supply_register (regi, (char *) (regp + regmap[regi]));
  93     }
  94 }
  95
  96 void
  97 fill_gregset (gregsetp, regno)
  98      gregset_t *gregsetp;
  99      int regno;
 100 {
 101   int regi;
 102   register greg_t *regp = (greg_t *) gregsetp;
 103   extern char registers[];
 104   extern int regmap[];
 105
 106   for (regi = 0 ; regi < NUM_REGS ; regi++)
 107     {
 108       if ((regno == -1) || (regno == regi))
 109         {
 110           *(regp + regmap[regi]) = *(int *) &registers[REGISTER_BYTE (regi)];
 111         }
 112     }
 113 }
 114
 115 #if defined (FP0_REGNUM)
 116
 117 /*  Given a pointer to a floating point register set in /proc format
 118     (fpregset_t *), unpack the register contents and supply them as gdb's
 119     idea of the current floating point register values. */
 120
 121 void
 122 supply_fpregset (fpregsetp)
 123      fpregset_t *fpregsetp;
 124 {
 125   register int regi;
 126
 127   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
 128 }
 129
 130 /*  Given a pointer to a floating point register set in /proc format
 131     (fpregset_t *), update the register specified by REGNO from gdb's idea
 132     of the current floating point register set.  If REGNO is -1, update
 133     them all. */
 134
 135 void
 136 fill_fpregset (fpregsetp, regno)
 137      fpregset_t *fpregsetp;
 138      int regno;
 139 {
 140   int regi;
 141   char *to;
 142   char *from;
 143   extern char registers[];
 144
 145   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
 146 }
 147
 148 #endif  /* defined (FP0_REGNUM) */