sysdeps/i386/sys/ucontext.h

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /* System V/i386 ABI compliant context switching support.  */
  20
  21 #ifndef _SYS_UCONTEXT_H
  22 #define _SYS_UCONTEXT_H 1
  23
  24 #include <features.h>
  25 #include <signal.h>
  26
  27 /* Type for general register.  */
  28 typedef int greg_t;
  29
  30 /* Number of general registers.  */
  31 #define NGREG   19
  32
  33 /* Container for all general registers.  */
  34 typedef greg_t gregset_t[NGREG];
  35
  36 /* Number of each register is the `gregset_t' array.  */
  37 enum
  38 {
  39   GS = 0,
  40 #define GS      GS
  41   FS,
  42 #define FS      FS
  43   ES,
  44 #define ES      ES
  45   DS,
  46 #define DS      DS
  47   EDI
  48 #define EDI     EDI
  49   ESI
  50 #define ESI     ESI
  51   EBP,
  52 #define EBP     EBP
  53   ESP,
  54 #define ESP     ESP
  55   EBX,
  56 #define EBX     EBX
  57   EDX,
  58 #define EDX     EDX
  59   ECX,
  60 #define ECX     ECX
  61   EAX,
  62 #define EAX     EAX
  63   TRAPNO,
  64 #define TRAPNO  TRAPNO
  65   ERR,
  66 #define ERR     ERR
  67   EIP,
  68 #define EIP     EIP
  69   CS,
  70 #define CS      CS
  71   EFL,
  72 #define EFL     EFL
  73   UESP,
  74 #define UESP    UESP
  75   SS
  76 #define SS      SS
  77 };
  78
  79 /* Structure to describe FPU registers.  */
  80 typedef struct fpregset
  81   {
  82     union
  83       {
  84         struct fpchip_state
  85           {
  86             int state[27];
  87             int status;
  88           } fpchip_state;
  89
  90         struct fp_emul_space
  91           {
  92             char fp_emul[246];
  93             char fp_epad[2];
  94           } fp_emul_space;
  95
  96         int f_fpregs[62];
  97       } fp_reg_set;
  98
  99     long int f_wregs[33];
 100   } fpregset_t;
 101
 102 /* Context to describe whole processor state.  */
 103 typedef struct
 104   {
 105     gregset_t gregs;
 106     fpregset_t fpregs;
 107   } mcontext_t;
 108
 109 /* Userlevel context.  */
 110 typedef struct ucontext
 111   {
 112     unsigned long int uc_flags;
 113     struct ucontext *uc_links;
 114     __sigset_t uc_sigmask;
 115     stack_t uc_stack;
 116     mcontext_t uc_mcontext;
 117     long int uc_filler[5];
 118   } ucontext_t;
 119
 120 #endif /* sys/ucontext.h */