sysdeps/unix/sysv/linux/i386/sys/ucontext.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_UCONTEXT_H
  19 #define _SYS_UCONTEXT_H 1
  20
  21 #include <features.h>
  22 #include <signal.h>
  23
  24 /* We need the signal context definitions even if they are not used
  25    included in <signal.h>.  */
  26 #include <bits/sigcontext.h>
  27
  28
  29 /* Type for general register.  */
  30 typedef int greg_t;
  31
  32 /* Number of general registers.  */
  33 #define NGREG   19
  34
  35 /* Container for all general registers.  */
  36 typedef greg_t gregset_t[NGREG];
  37
  38 #ifdef __USE_GNU
  39 /* Number of each register is the `gregset_t' array.  */
  40 enum
  41 {
  42   REG_GS = 0,
  43 # define REG_GS         REG_GS
  44   REG_FS,
  45 # define REG_FS         REG_FS
  46   REG_ES,
  47 # define REG_ES         REG_ES
  48   REG_DS,
  49 # define REG_DS         REG_DS
  50   REG_EDI,
  51 # define REG_EDI        REG_EDI
  52   REG_ESI,
  53 # define REG_ESI        REG_ESI
  54   REG_EBP,
  55 # define REG_EBP        REG_EBP
  56   REG_ESP,
  57 # define REG_ESP        REG_ESP
  58   REG_EBX,
  59 # define REG_EBX        REG_EBX
  60   REG_EDX,
  61 # define REG_EDX        REG_EDX
  62   REG_ECX,
  63 # define REG_ECX        REG_ECX
  64   REG_EAX,
  65 # define REG_EAX        REG_EAX
  66   REG_TRAPNO,
  67 # define REG_TRAPNO     REG_TRAPNO
  68   REG_ERR,
  69 # define REG_ERR        REG_ERR
  70   REG_EIP,
  71 # define REG_EIP        REG_EIP
  72   REG_CS,
  73 # define REG_CS         REG_CS
  74   REG_EFL,
  75 # define REG_EFL        REG_EFL
  76   REG_UESP,
  77 # define REG_UESP       REG_UESP
  78   REG_SS
  79 # define REG_SS REG_SS
  80 };
  81 #endif
  82
  83 /* Definitions taken from the kernel headers.  */
  84 struct _libc_fpreg
  85 {
  86   unsigned short int significand[4];
  87   unsigned short int exponent;
  88 };
  89
  90 struct _libc_fpstate
  91 {
  92   unsigned long int cw;
  93   unsigned long int sw;
  94   unsigned long int tag;
  95   unsigned long int ipoff;
  96   unsigned long int cssel;
  97   unsigned long int dataoff;
  98   unsigned long int datasel;
  99   struct _libc_fpreg _st[8];
 100   unsigned long int status;
 101 };
 102
 103 /* Structure to describe FPU registers.  */
 104 typedef struct _libc_fpstate *fpregset_t;
 105
 106 /* Context to describe whole processor state.  */
 107 typedef struct
 108   {
 109     gregset_t gregs;
 110     /* Due to Linux's history we have to use a pointer here.  The SysV/i386
 111        ABI requires a struct with the values.  */
 112     fpregset_t fpregs;
 113     unsigned long int oldmask;
 114     unsigned long int cr2;
 115   } mcontext_t;
 116
 117 /* Userlevel context.  */
 118 typedef struct ucontext
 119   {
 120     unsigned long int uc_flags;
 121     struct ucontext *uc_link;
 122     stack_t uc_stack;
 123     mcontext_t uc_mcontext;
 124     __sigset_t uc_sigmask;
 125     struct _libc_fpstate __fpregs_mem;
 126   } ucontext_t;
 127
 128 #endif /* sys/ucontext.h */