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

   1 /* Copyright (C) 2000-2015 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 /* Forward definition to avoid parse errors */
  22 struct ucontext;
  23 typedef struct ucontext ucontext_t;
  24 #include <features.h>
  25 #include <signal.h>
  26
  27 /* We need the signal context definitions even if they are not used
  28    included in <signal.h>.  */
  29 #include <bits/sigcontext.h>
  30
  31 /* Type for a program status word.  */
  32 typedef struct
  33 {
  34   unsigned long mask;
  35   unsigned long addr;
  36 } __attribute__ ((__aligned__(8))) __psw_t;
  37
  38 /* Type for a general-purpose register.  */
  39 typedef unsigned long greg_t;
  40
  41 /* And the whole bunch of them.  We should have used `struct s390_regs',
  42    but to avoid name space pollution and since the tradition says that
  43    the register set is an array, we make gregset_t a simple array
  44    that has the same size as s390_regs.  This is needed for the
  45    elf_prstatus structure.  */
  46 #if __WORDSIZE == 64
  47 # define NGREG 27
  48 #else
  49 # define NGREG 36
  50 #endif
  51 /* Must match kernels psw_t alignment.  */
  52 typedef greg_t gregset_t[NGREG] __attribute__ ((__aligned__(8)));
  53
  54 typedef union
  55   {
  56     double  d;
  57     float   f;
  58   } fpreg_t;
  59
  60 /* Register set for the floating-point registers.  */
  61 typedef struct
  62   {
  63     unsigned int fpc;
  64     fpreg_t fprs[16];
  65   } fpregset_t;
  66
  67 /* Context to describe whole processor state.  */
  68 typedef struct
  69   {
  70     __psw_t psw;
  71     unsigned long gregs[16];
  72     unsigned int aregs[16];
  73     fpregset_t fpregs;
  74   } mcontext_t;
  75
  76 /* Userlevel context.  */
  77 struct ucontext
  78   {
  79     unsigned long int uc_flags;
  80     struct ucontext *uc_link;
  81     stack_t uc_stack;
  82     mcontext_t uc_mcontext;
  83     __sigset_t uc_sigmask;
  84   };
  85
  86
  87 #endif /* sys/ucontext.h */