1  /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library.  If not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  /* System V/ARM ABI compliant context switching support.  */
      19  
      20  #ifndef _SYS_UCONTEXT_H
      21  #define _SYS_UCONTEXT_H	1
      22  
      23  #include <features.h>
      24  
      25  #include <bits/types/sigset_t.h>
      26  #include <bits/types/stack_t.h>
      27  
      28  
      29  typedef int greg_t;
      30  
      31  /* Number of general registers.  */
      32  #define __NGREG	16
      33  #ifdef __USE_MISC
      34  # define NGREG	__NGREG
      35  #endif
      36  
      37  /* Container for all general registers.  */
      38  typedef greg_t gregset_t[__NGREG];
      39  
      40  #ifdef __USE_MISC
      41  /* Number of each register is the `gregset_t' array.  */
      42  enum
      43  {
      44    R0 = 0,
      45  # define R0	R0
      46    R1 = 1,
      47  # define R1	R1
      48    R2 = 2,
      49  # define R2	R2
      50    R3 = 3,
      51  # define R3	R3
      52    R4 = 4,
      53  # define R4	R4
      54    R5 = 5,
      55  # define R5	R5
      56    R6 = 6,
      57  # define R6	R6
      58    R7 = 7,
      59  # define R7	R7
      60    R8 = 8,
      61  # define R8	R8
      62    R9 = 9,
      63  # define R9	R9
      64    R10 = 10,
      65  # define R10	R10
      66    R11 = 11,
      67  # define R11	R11
      68    R12 = 12,
      69  # define R12	R12
      70    R13 = 13,
      71  # define R13	R13
      72    R14 = 14,
      73  # define R14	R14
      74    R15 = 15,
      75  # define R15	R15
      76  };
      77  #endif
      78  
      79  #ifdef __USE_MISC
      80  # define __ctx(fld) fld
      81  #else
      82  # define __ctx(fld) __ ## fld
      83  #endif
      84  
      85  /* Structure to describe FPU registers.  */
      86  typedef struct
      87    {
      88    } fpregset_t;
      89  
      90  /* Context to describe whole processor state.  */
      91  typedef struct
      92    {
      93      gregset_t __ctx(gregs);
      94      fpregset_t __ctx(fpregs);
      95    } mcontext_t;
      96  
      97  /* Userlevel context.  */
      98  typedef struct ucontext_t
      99    {
     100      unsigned long int __ctx(uc_flags);
     101      struct ucontext_t *uc_link;
     102      sigset_t uc_sigmask;
     103      stack_t uc_stack;
     104      mcontext_t uc_mcontext;
     105      long int __glibc_reserved1[5];
     106    } ucontext_t;
     107  
     108  #undef __ctx
     109  
     110  #endif /* sys/ucontext.h */