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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_UCONTEXT_H
  20 #define _SYS_UCONTEXT_H 1
  21
  22 #include <features.h>
  23 #include <signal.h>
  24
  25 /* We need the signal context definitions even if they are not used
  26    included in <signal.h>.  */
  27 #include <bits/sigcontext.h>
  28
  29
  30 /* Type for general register.  */
  31 typedef int greg_t;
  32
  33 /* Number of general registers.  */
  34 #define NGREG   19
  35
  36 /* Container for all general registers.  */
  37 typedef greg_t gregset_t[NGREG];
  38
  39 #ifdef __USE_GNU
  40 /* Number of each register is the `gregset_t' array.  */
  41 enum
  42 {
  43   REG_GS = 0,
  44 # define REG_GS         REG_GS
  45   REG_FS,
  46 # define REG_FS         REG_FS
  47   REG_ES,
  48 # define REG_ES         REG_ES
  49   REG_DS,
  50 # define REG_DS         REG_DS
  51   REG_EDI,
  52 # define REG_EDI        REG_EDI
  53   REG_ESI,
  54 # define REG_ESI        REG_ESI
  55   REG_EBP,
  56 # define REG_EBP        REG_EBP
  57   REG_ESP,
  58 # define REG_ESP        REG_ESP
  59   REG_EBX,
  60 # define REG_EBX        REG_EBX
  61   REG_EDX,
  62 # define REG_EDX        REG_EDX
  63   REG_ECX,
  64 # define REG_ECX        REG_ECX
  65   REG_EAX,
  66 # define REG_EAX        REG_EAX
  67   REG_TRAPNO,
  68 # define REG_TRAPNO     REG_TRAPNO
  69   REG_ERR,
  70 # define REG_ERR        REG_ERR
  71   REG_EIP,
  72 # define REG_EIP        REG_EIP
  73   REG_CS,
  74 # define REG_CS         REG_CS
  75   REG_EFL,
  76 # define REG_EFL        REG_EFL
  77   REG_UESP,
  78 # define REG_UESP       REG_UESP
  79   REG_SS
  80 # define REG_SS REG_SS
  81 };
  82 #endif
  83
  84 /* Definitions taken from the kernel headers.  */
  85 struct _libc_fpreg
  86 {
  87   unsigned short int significand[4];
  88   unsigned short int exponent;
  89 };
  90
  91 struct _libc_fpstate
  92 {
  93   unsigned long int cw;
  94   unsigned long int sw;
  95   unsigned long int tag;
  96   unsigned long int ipoff;
  97   unsigned long int cssel;
  98   unsigned long int dataoff;
  99   unsigned long int datasel;
 100   struct _libc_fpreg _st[8];
 101   unsigned long int status;
 102 };
 103
 104 /* Structure to describe FPU registers.  */
 105 typedef struct _libc_fpstate *fpregset_t;
 106
 107 /* Context to describe whole processor state.  */
 108 typedef struct
 109   {
 110     gregset_t gregs;
 111     /* Due to Linux's history we have to use a pointer here.  The SysV/i386
 112        ABI requires a struct with the values.  */
 113     fpregset_t fpregs;
 114     unsigned long int oldmask;
 115     unsigned long int cr2;
 116   } mcontext_t;
 117
 118 /* Userlevel context.  */
 119 typedef struct ucontext
 120   {
 121     unsigned long int uc_flags;
 122     struct ucontext *uc_link;
 123     stack_t uc_stack;
 124     mcontext_t uc_mcontext;
 125     __sigset_t uc_sigmask;
 126     struct _libc_fpstate __fpregs_mem;
 127   } ucontext_t;
 128
 129 #endif /* sys/ucontext.h */