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

   1 /* Copyright (C) 2000, 2001, 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SYS_UCONTEXT_H
  21 #define _SYS_UCONTEXT_H 1
  22 /* Forward definition to avoid parse errors */
  23 struct ucontext;
  24 typedef struct ucontext ucontext_t;
  25 #include <features.h>
  26 #include <signal.h>
  27
  28 /* We need the signal context definitions even if they are not used
  29    included in <signal.h>.  */
  30 #include <bits/sigcontext.h>
  31
  32 /* Type for a program status word.  */
  33 typedef struct
  34 {
  35   unsigned long mask;
  36   unsigned long addr;
  37 } __attribute__ ((aligned(8))) __psw_t;
  38
  39 /* Type for a general-purpose register.  */
  40 typedef unsigned long greg_t;
  41
  42 /* And the whole bunch of them.  We should have used `struct s390_regs',
  43    but to avoid name space pollution and since the tradition says that
  44    the register set is an array, we make gregset_t a simple array
  45    that has the same size as s390_regs.  This is needed for the
  46    elf_prstatus structure.  */
  47 #if __WORDSIZE == 64
  48 # define NGREG 27
  49 #else
  50 # define NGREG 36
  51 #endif
  52 /* Must match kernels psw_t alignment.  */
  53 typedef greg_t gregset_t[NGREG] __attribute__ ((aligned(8)));
  54
  55 typedef union
  56   {
  57     double  d;
  58     float   f;
  59   } fpreg_t;
  60
  61 /* Register set for the floating-point registers.  */
  62 typedef struct
  63   {
  64     unsigned int fpc;
  65     fpreg_t fprs[16];
  66   } fpregset_t;
  67
  68 /* Context to describe whole processor state.  */
  69 typedef struct
  70   {
  71     __psw_t psw;
  72     unsigned long gregs[16];
  73     unsigned int aregs[16];
  74     fpregset_t fpregs;
  75   } mcontext_t;
  76
  77 /* Userlevel context.  */
  78 struct ucontext
  79   {
  80     unsigned long int uc_flags;
  81     struct ucontext *uc_link;
  82     stack_t uc_stack;
  83     mcontext_t uc_mcontext;
  84     __sigset_t uc_sigmask;
  85   };
  86
  87
  88 #endif /* sys/ucontext.h */