1  /* Copyright (C) 2000-2023 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  #ifndef _SYS_UCONTEXT_H
      19  #define _SYS_UCONTEXT_H	1
      20  
      21  #include <features.h>
      22  
      23  #include <bits/types/sigset_t.h>
      24  #include <bits/types/stack_t.h>
      25  
      26  
      27  #ifdef __USE_MISC
      28  # define __ctx(fld) fld
      29  #else
      30  # define __ctx(fld) __ ## fld
      31  #endif
      32  
      33  /* Type for a program status word.  */
      34  typedef struct
      35  {
      36    unsigned long __ctx(mask);
      37    unsigned long __ctx(addr);
      38  } __attribute__ ((__aligned__(8))) __psw_t;
      39  
      40  /* Type for a general-purpose register.  */
      41  typedef unsigned long greg_t;
      42  
      43  /* And the whole bunch of them.  We should have used `struct s390_regs',
      44     but to avoid name space pollution and since the tradition says that
      45     the register set is an array, we make gregset_t a simple array
      46     that has the same size as s390_regs.  This is needed for the
      47     elf_prstatus structure.  */
      48  #if __WORDSIZE == 64
      49  # define __NGREG 27
      50  #else
      51  # define __NGREG 36
      52  #endif
      53  #ifdef __USE_MISC
      54  # define NGREG __NGREG
      55  #endif
      56  /* Must match kernels psw_t alignment.  */
      57  typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
      58  
      59  typedef union
      60    {
      61      double  __ctx(d);
      62      float   __ctx(f);
      63    } fpreg_t;
      64  
      65  /* Register set for the floating-point registers.  */
      66  typedef struct
      67    {
      68      unsigned int __ctx(fpc);
      69      fpreg_t __ctx(fprs)[16];
      70    } fpregset_t;
      71  
      72  /* Context to describe whole processor state.  */
      73  typedef struct
      74    {
      75      __psw_t __ctx(psw);
      76      unsigned long __ctx(gregs)[16];
      77      unsigned int __ctx(aregs)[16];
      78      fpregset_t __ctx(fpregs);
      79    } mcontext_t;
      80  
      81  /* Userlevel context.  */
      82  typedef struct ucontext_t
      83    {
      84      unsigned long int __ctx(uc_flags);
      85      struct ucontext_t *uc_link;
      86      stack_t uc_stack;
      87      mcontext_t uc_mcontext;
      88      sigset_t uc_sigmask;
      89    } ucontext_t;
      90  
      91  #undef __ctx
      92  
      93  
      94  #endif /* sys/ucontext.h */