/*
 * Copyright (C) 2014 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _SYS_UCONTEXT_H_
#define _SYS_UCONTEXT_H_

#include <signal.h>
#include <sys/user.h>

__BEGIN_DECLS

#if defined(__arm__)

#error TODO

#elif defined(__arm64__)

#error TODO

#elif defined(__i386__)

enum {
  REG_GS = 0,
  REG_FS,
  REG_ES,
  REG_DS,
  REG_EDI,
  REG_ESI,
  REG_EBP,
  REG_ESP,
  REG_EBX,
  REG_EDX,
  REG_ECX,
  REG_EAX,
  REG_TRAPNO,
  REG_ERR,
  REG_EIP,
  REG_CS,
  REG_EFL,
  REG_UESP,
  REG_SS,
  NGREG
};

typedef int greg_t;
typedef greg_t gregset_t[NGREG];

struct _libc_fpreg {
  unsigned short significand[4];
  unsigned short exponent;
};

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

typedef struct _libc_fpstate* fpregset_t;

typedef struct {
  gregset_t gregs;
  fpregset_t fpregs;
  unsigned long oldmask;
  unsigned long cr2;
} mcontext_t;

typedef struct ucontext {
  unsigned long uc_flags;
  struct ucontext* uc_link;
  stack_t uc_stack;
  mcontext_t uc_mcontext;
  sigset_t uc_sigmask;
  /* TODO: __fpregs_mem? */
} ucontext_t;

#elif defined(__mips__)

#error TODO

#elif defined(__mips64__)

#error TODO

#elif defined(__x86_64__)

enum {
  REG_R8 = 0,
  REG_R9,
  REG_R10,
  REG_R11,
  REG_R12,
  REG_R13,
  REG_R14,
  REG_R15,
  REG_RDI,
  REG_RSI,
  REG_RBP,
  REG_RBX,
  REG_RDX,
  REG_RAX,
  REG_RCX,
  REG_RSP,
  REG_RIP,
  REG_EFL,
  REG_CSGSFS,
  REG_ERR,
  REG_TRAPNO,
  REG_OLDMASK,
  REG_CR2,
  NGREG
};

typedef long greg_t;
typedef greg_t gregset_t[NGREG];

typedef struct user_i387_struct* fpregset_t;

typedef struct {
  gregset_t gregs;
  fpregset_t fpregs;
  /* TODO: reserved space? */
} mcontext_t;

typedef struct ucontext {
  unsigned long uc_flags;
  struct ucontext* uc_link;
  stack_t uc_stack;
  mcontext_t uc_mcontext;
  sigset_t uc_sigmask;
  /* TODO: __fpregs_mem? */
} ucontext_t;

#endif

__END_DECLS

#endif /* _SYS_UCONTEXT_H_ */