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/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* System V/i386 ABI compliant context switching support. */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H 1
#include <features.h>
#include <signal.h>
/* Type for general register. */
typedef int greg_t;
/* Number of general registers. */
#define NGREG 19
/* Container for all general registers. */
typedef greg_t gregset_t[NGREG];
/* Number of each register is the `gregset_t' array. */
enum
{
GS = 0,
#define GS GS
FS,
#define FS FS
ES,
#define ES ES
DS,
#define DS DS
EDI
#define EDI EDI
ESI
#define ESI ESI
EBP,
#define EBP EBP
ESP,
#define ESP ESP
EBX,
#define EBX EBX
EDX,
#define EDX EDX
ECX,
#define ECX ECX
EAX,
#define EAX EAX
TRAPNO,
#define TRAPNO TRAPNO
ERR,
#define ERR ERR
EIP,
#define EIP EIP
CS,
#define CS CS
EFL,
#define EFL EFL
UESP,
#define UESP UESP
SS
#define SS SS
};
/* Structure to describe FPU registers. */
typedef struct fpregset
{
union
{
struct fpchip_state
{
int state[27];
int status;
} fpchip_state;
struct fp_emul_space
{
char fp_emul[246];
char fp_epad[2];
} fp_emul_space;
int f_fpregs[62];
} fp_reg_set;
long int f_wregs[33];
} fpregset_t;
/* Context to describe whole processor state. */
typedef struct
{
gregset_t gregs;
fpregset_t fpregs;
} mcontext_t;
/* Userlevel context. */
typedef struct ucontext
{
unsigned long int uc_flags;
struct ucontext *uc_links;
__sigset_t uc_sigmask;
stack_t uc_stack;
mcontext_t uc_mcontext;
long int uc_filler[5];
} ucontext_t;
#endif /* sys/ucontext.h */
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