1  /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
       2  
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* System V/AArch64 ABI compliant context switching support.  */
      20  
      21  #ifndef _SYS_UCONTEXT_H
      22  #define _SYS_UCONTEXT_H	1
      23  
      24  #include <features.h>
      25  
      26  #include <bits/types/sigset_t.h>
      27  #include <bits/types/stack_t.h>
      28  
      29  #ifdef __USE_MISC
      30  # define __ctx(fld) fld
      31  #else
      32  # define __ctx(fld) __ ## fld
      33  #endif
      34  
      35  #ifdef __USE_MISC
      36  # include <sys/procfs.h>
      37  
      38  
      39  typedef elf_greg_t greg_t;
      40  
      41  /* Container for all general registers.  */
      42  typedef elf_gregset_t gregset_t;
      43  
      44  /* Structure to describe FPU registers.  */
      45  typedef elf_fpregset_t	fpregset_t;
      46  #endif
      47  
      48  /* Context to describe whole processor state.  This only describes
      49     the core registers; coprocessor registers get saved elsewhere
      50     (e.g. in uc_regspace, or somewhere unspecified on the stack
      51     during non-RT signal handlers).  */
      52  typedef struct
      53    {
      54      unsigned long long int __ctx(fault_address);
      55      unsigned long long int __ctx(regs)[31];
      56      unsigned long long int __ctx(sp);
      57      unsigned long long int __ctx(pc);
      58      unsigned long long int __ctx(pstate);
      59      /* This field contains extension records for additional processor
      60         state such as the FP/SIMD state.  It has to match the definition
      61         of the corresponding field in the sigcontext struct, see the
      62         arch/arm64/include/uapi/asm/sigcontext.h linux header for details.  */
      63      unsigned char __reserved[4096] __attribute__ ((__aligned__ (16)));
      64    } mcontext_t;
      65  
      66  /* Userlevel context.  */
      67  typedef struct ucontext_t
      68    {
      69      unsigned long __ctx(uc_flags);
      70      struct ucontext_t *uc_link;
      71      stack_t uc_stack;
      72      sigset_t uc_sigmask;
      73      mcontext_t uc_mcontext;
      74    } ucontext_t;
      75  
      76  #undef __ctx
      77  
      78  #endif /* sys/ucontext.h */