sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h

   1 /* Copyright (C) 1998-2019 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    <http://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 */