text: /* Copyright (C) 1998-2017 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/ARM 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>
  
  
  typedef int greg_t;
  
  /* Number of general registers.  */
  #define NGREG	18
  
  /* Container for all general registers.  */
  typedef greg_t gregset_t[NGREG];
  
  /* Number of each register is the `gregset_t' array.  */
  enum
  {
    REG_R0 = 0,
  #define REG_R0	REG_R0
    REG_R1 = 1,
  #define REG_R1	REG_R1
    REG_R2 = 2,
  #define REG_R2	REG_R2
    REG_R3 = 3,
  #define REG_R3	REG_R3
    REG_R4 = 4,
  #define REG_R4	REG_R4
    REG_R5 = 5,
  #define REG_R5	REG_R5
    REG_R6 = 6,
  #define REG_R6	REG_R6
    REG_R7 = 7,
  #define REG_R7	REG_R7
    REG_R8 = 8,
  #define REG_R8	REG_R8
    REG_R9 = 9,
  #define REG_R9	REG_R9
    REG_R10 = 10,
  #define REG_R10	REG_R10
    REG_R11 = 11,
  #define REG_R11	REG_R11
    REG_R12 = 12,
  #define REG_R12	REG_R12
    REG_R13 = 13,
  #define REG_R13	REG_R13
    REG_R14 = 14,
  #define REG_R14	REG_R14
    REG_R15 = 15
  #define REG_R15	REG_R15
  };
  
  struct _libc_fpstate
  {
    struct
    {
      unsigned int sign1:1;
      unsigned int unused:15;
      unsigned int sign2:1;
      unsigned int exponent:14;
      unsigned int j:1;
      unsigned int mantissa1:31;
      unsigned int mantissa0:32;
    } fpregs[8];
    unsigned int fpsr:32;
    unsigned int fpcr:32;
    unsigned char ftype[8];
    unsigned int init_flag;
  };
  /* Structure to describe FPU registers.  */
  typedef struct _libc_fpstate fpregset_t;
  
  /* Context to describe whole processor state.  This only describes
     the core registers; coprocessor registers get saved elsewhere
     (e.g. in uc_regspace, or somewhere unspecified on the stack
     during non-RT signal handlers).  */
  typedef struct sigcontext mcontext_t;
  
  /* Userlevel context.  */
  typedef struct ucontext
    {
      unsigned long uc_flags;
      struct ucontext *uc_link;
      stack_t uc_stack;
      mcontext_t uc_mcontext;
      __sigset_t uc_sigmask;
      unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
    } ucontext_t;
  
  #endif /* sys/ucontext.h */
  