ucontext.h

ucLinux is a very good embeded sytem. Most of company use this as their development OS.

/* Copyright (C) 2001, 2002 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H	1

#include <features.h>
#include <signal.h>
#include <bits/wordsize.h>

/* We need the signal context definitions even if they are not used
   included in <signal.h>.  */
#include <bits/sigcontext.h>

#if __WORDSIZE == 64

/* Type for general register.  */
typedef long int greg_t;

/* Number of general registers.  */
#define NGREG	23

/* Container for all general registers.  */
typedef greg_t gregset_t[NGREG];

#ifdef __USE_GNU
/* Number of each register in the `gregset_t' array.  */
enum
{
  REG_R8 = 0,
# define REG_R8		REG_R8
  REG_R9,
# define REG_R9		REG_R9
  REG_R10,
# define REG_R10	REG_R10
  REG_R11,
# define REG_R11	REG_R11
  REG_R12,
# define REG_R12	REG_R12
  REG_R13,
# define REG_R13	REG_R13
  REG_R14,
# define REG_R14	REG_R14
  REG_R15,
# define REG_R15	REG_R15
  REG_RDI,
# define REG_RDI	REG_RDI
  REG_RSI,
# define REG_RSI	REG_RSI
  REG_RBP,
# define REG_RBP	REG_RBP
  REG_RBX,
# define REG_RBX	REG_RBX
  REG_RDX,
# define REG_RDX	REG_RDX
  REG_RAX,
# define REG_RAX	REG_RAX
  REG_RCX,
# define REG_RCX	REG_RCX
  REG_RSP,
# define REG_RSP	REG_RSP
  REG_RIP,
# define REG_RIP	REG_RIP
  REG_EFL,
# define REG_EFL	REG_EFL
  REG_CSGSFS,		/* Actually short cs, gs, fs, __pad0.  */
# define REG_CSGSFS	REG_CSGSFS
  REG_ERR,
# define REG_ERR	REG_ERR
  REG_TRAPNO,
# define REG_TRAPNO	REG_TRAPNO
  REG_OLDMASK,
# define REG_OLDMASK	REG_OLDMASK
  REG_CR2
# define REG_CR2	REG_CR2
};
#endif

struct _libc_fpxreg
{
  unsigned short int significand[4];
  unsigned short int exponent;
  unsigned short int padding[3];
};

struct _libc_xmmreg
{
  __uint32_t	element[4];
};

struct _libc_fpstate
{
  /* 64-bit FXSAVE format.  */
  __uint16_t		cwd;
  __uint16_t		swd;
  __uint16_t		ftw;
  __uint16_t		fop;
  __uint64_t		rip;
  __uint64_t		rdp;
  __uint32_t		mxcsr;
  __uint32_t		mxcr_mask;
  struct _libc_fpxreg	_st[8];
  struct _libc_xmmreg	_xmm[16];
  __uint32_t		padding[24];
};

/* Structure to describe FPU registers.  */
typedef struct _libc_fpstate *fpregset_t;

/* Context to describe whole processor state.  */
typedef struct
  {
    gregset_t gregs;
    /* Note that fpregs is a pointer.  */
    fpregset_t fpregs;
    unsigned long __reserved1 [8];
} mcontext_t;

/* Userlevel context.  */
typedef struct ucontext
  {
    unsigned long int uc_flags;
    struct ucontext *uc_link;
    stack_t uc_stack;
    mcontext_t uc_mcontext;
    __sigset_t uc_sigmask;
    struct _libc_fpstate __fpregs_mem;
  } ucontext_t;

#else /* __WORDSIZE == 32 */

/* 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];

#ifdef __USE_GNU
/* 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
};
#endif

/* Definitions taken from the kernel headers.  */
struct _libc_fpreg
{
  unsigned short int significand[4];
  unsigned short int exponent;
};

struct _libc_fpstate
{
  unsigned long int cw;
  unsigned long int sw;
  unsigned long int tag;
  unsigned long int ipoff;
  unsigned long int cssel;
  unsigned long int dataoff;
  unsigned long int datasel;
  struct _libc_fpreg _st[8];
  unsigned long int status;
};

/* Structure to describe FPU registers.  */
typedef struct _libc_fpstate *fpregset_t;

/* Context to describe whole processor state.  */
typedef struct
  {
    gregset_t gregs;
    /* Due to Linux's history we have to use a pointer here.  The SysV/i386
       ABI requires a struct with the values.  */
    fpregset_t fpregs;
    unsigned long int oldmask;
    unsigned long int cr2;
  } mcontext_t;

/* Userlevel context.  */
typedef struct ucontext
  {
    unsigned long int uc_flags;
    struct ucontext *uc_link;
    stack_t uc_stack;
    mcontext_t uc_mcontext;
    __sigset_t uc_sigmask;
    struct _libc_fpstate __fpregs_mem;
  } ucontext_t;

#endif /* __WORDSIZE == 32 */

#endif /* sys/ucontext.h */