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

   1 /* Copyright (C) 2000-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_UCONTEXT_H
  19 #define _SYS_UCONTEXT_H 1
  20
  21 #include <features.h>
  22
  23 #include <bits/types/sigset_t.h>
  24 #include <bits/types/stack_t.h>
  25
  26
  27 #ifdef __USE_MISC
  28 # define __ctx(fld) fld
  29 #else
  30 # define __ctx(fld) __ ## fld
  31 #endif
  32
  33 /* Type for a program status word.  */
  34 typedef struct
  35 {
  36   unsigned long __ctx(mask);
  37   unsigned long __ctx(addr);
  38 } __attribute__ ((__aligned__(8))) __psw_t;
  39
  40 /* Type for a general-purpose register.  */
  41 typedef unsigned long greg_t;
  42
  43 /* And the whole bunch of them.  We should have used `struct s390_regs',
  44    but to avoid name space pollution and since the tradition says that
  45    the register set is an array, we make gregset_t a simple array
  46    that has the same size as s390_regs.  This is needed for the
  47    elf_prstatus structure.  */
  48 #if __WORDSIZE == 64
  49 # define __NGREG 27
  50 #else
  51 # define __NGREG 36
  52 #endif
  53 #ifdef __USE_MISC
  54 # define NGREG __NGREG
  55 #endif
  56 /* Must match kernels psw_t alignment.  */
  57 typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
  58
  59 typedef union
  60   {
  61     double  __ctx(d);
  62     float   __ctx(f);
  63   } fpreg_t;
  64
  65 /* Register set for the floating-point registers.  */
  66 typedef struct
  67   {
  68     unsigned int __ctx(fpc);
  69     fpreg_t __ctx(fprs)[16];
  70   } fpregset_t;
  71
  72 /* Context to describe whole processor state.  */
  73 typedef struct
  74   {
  75     __psw_t __ctx(psw);
  76     unsigned long __ctx(gregs)[16];
  77     unsigned int __ctx(aregs)[16];
  78     fpregset_t __ctx(fpregs);
  79   } mcontext_t;
  80
  81 /* Userlevel context.  */
  82 typedef struct ucontext_t
  83   {
  84     unsigned long int __ctx(uc_flags);
  85     struct ucontext_t *uc_link;
  86     stack_t uc_stack;
  87     mcontext_t uc_mcontext;
  88     sigset_t uc_sigmask;
  89   } ucontext_t;
  90
  91 #undef __ctx
  92
  93
  94 #endif /* sys/ucontext.h */