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

   1 /* Copyright (C) 2000-2020 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    <https://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/types/stack_t.h>
  26
  27
  28 #ifdef __USE_MISC
  29 # define __ctx(fld) fld
  30 #else
  31 # define __ctx(fld) __ ## fld
  32 #endif
  33
  34 /* Type for a program status word.  */
  35 typedef struct
  36 {
  37   unsigned long __ctx(mask);
  38   unsigned long __ctx(addr);
  39 } __attribute__ ((__aligned__(8))) __psw_t;
  40
  41 /* Type for a general-purpose register.  */
  42 typedef unsigned long greg_t;
  43
  44 /* And the whole bunch of them.  We should have used `struct s390_regs',
  45    but to avoid name space pollution and since the tradition says that
  46    the register set is an array, we make gregset_t a simple array
  47    that has the same size as s390_regs.  This is needed for the
  48    elf_prstatus structure.  */
  49 #if __WORDSIZE == 64
  50 # define __NGREG 27
  51 #else
  52 # define __NGREG 36
  53 #endif
  54 #ifdef __USE_MISC
  55 # define NGREG __NGREG
  56 #endif
  57 /* Must match kernels psw_t alignment.  */
  58 typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
  59
  60 typedef union
  61   {
  62     double  __ctx(d);
  63     float   __ctx(f);
  64   } fpreg_t;
  65
  66 /* Register set for the floating-point registers.  */
  67 typedef struct
  68   {
  69     unsigned int __ctx(fpc);
  70     fpreg_t __ctx(fprs)[16];
  71   } fpregset_t;
  72
  73 /* Context to describe whole processor state.  */
  74 typedef struct
  75   {
  76     __psw_t __ctx(psw);
  77     unsigned long __ctx(gregs)[16];
  78     unsigned int __ctx(aregs)[16];
  79     fpregset_t __ctx(fpregs);
  80   } mcontext_t;
  81
  82 /* Userlevel context.  */
  83 typedef struct ucontext_t
  84   {
  85     unsigned long int __ctx(uc_flags);
  86     struct ucontext_t *uc_link;
  87     stack_t uc_stack;
  88     mcontext_t uc_mcontext;
  89     sigset_t uc_sigmask;
  90   } ucontext_t;
  91
  92 #undef __ctx
  93
  94
  95 #endif /* sys/ucontext.h */