sysdeps/unix/sysv/linux/s390/sys/ucontext.h

   1 /* Copyright (C) 2000-2017 Free Software Foundation, Inc.
   2    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
   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 #ifndef _SYS_UCONTEXT_H
  20 #define _SYS_UCONTEXT_H 1
  21
  22 #include <features.h>
  23
  24 #include <bits/types/sigset_t.h>
  25 #include <bits/sigcontext.h>
  26 #include <bits/types/stack_t.h>
  27
  28
  29 /* Type for a program status word.  */
  30 typedef struct
  31 {
  32   unsigned long mask;
  33   unsigned long addr;
  34 } __attribute__ ((__aligned__(8))) __psw_t;
  35
  36 /* Type for a general-purpose register.  */
  37 typedef unsigned long greg_t;
  38
  39 /* And the whole bunch of them.  We should have used `struct s390_regs',
  40    but to avoid name space pollution and since the tradition says that
  41    the register set is an array, we make gregset_t a simple array
  42    that has the same size as s390_regs.  This is needed for the
  43    elf_prstatus structure.  */
  44 #if __WORDSIZE == 64
  45 # define NGREG 27
  46 #else
  47 # define NGREG 36
  48 #endif
  49 /* Must match kernels psw_t alignment.  */
  50 typedef greg_t gregset_t[NGREG] __attribute__ ((__aligned__(8)));
  51
  52 typedef union
  53   {
  54     double  d;
  55     float   f;
  56   } fpreg_t;
  57
  58 /* Register set for the floating-point registers.  */
  59 typedef struct
  60   {
  61     unsigned int fpc;
  62     fpreg_t fprs[16];
  63   } fpregset_t;
  64
  65 /* Context to describe whole processor state.  */
  66 typedef struct
  67   {
  68     __psw_t psw;
  69     unsigned long gregs[16];
  70     unsigned int aregs[16];
  71     fpregset_t fpregs;
  72   } mcontext_t;
  73
  74 /* Userlevel context.  */
  75 typedef struct ucontext
  76   {
  77     unsigned long int uc_flags;
  78     struct ucontext *uc_link;
  79     stack_t uc_stack;
  80     mcontext_t uc_mcontext;
  81     sigset_t uc_sigmask;
  82   } ucontext_t;
  83
  84
  85 #endif /* sys/ucontext.h */