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/* Copyright (C) 1997-2017 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* System V/i386 ABI compliant context switching support. */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H 1
#include <features.h>
#include <signal.h>
/* We need the signal context definitions even if they are not exposed
by <signal.h>. */
#include <bits/sigcontext.h>
#include <bits/sigstack.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
{
REG_GS = 0,
#define REG_GS REG_GS
REG_FS,
#define REG_FS REG_FS
REG_ES,
#define REG_ES REG_ES
REG_DS,
#define REG_DS REG_DS
REG_EDI,
#define REG_EDI REG_EDI
REG_ESI,
#define REG_ESI REG_ESI
REG_EBP,
#define REG_EBP REG_EBP
REG_ESP,
#define REG_ESP REG_ESP
REG_EBX,
#define REG_EBX REG_EBX
REG_EDX,
#define REG_EDX REG_EDX
REG_ECX,
#define REG_ECX REG_ECX
REG_EAX,
#define REG_EAX REG_EAX
REG_TRAPNO,
#define REG_TRAPNO REG_TRAPNO
REG_ERR,
#define REG_ERR REG_ERR
REG_EIP,
#define REG_EIP REG_EIP
REG_CS,
#define REG_CS REG_CS
REG_EFL,
#define REG_EFL REG_EFL
REG_UESP,
#define REG_UESP REG_UESP
REG_SS
#define REG_SS REG_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_link;
__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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