sysdeps/unix/sysv/linux/ia64/sys/ucontext.h

   1 /* Copyright (C) 1998-2024 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 /*
  34  * These are here mostly for backwards compatibility with older Unices.
  35  * IA-64 Linux does not distinguish between "mcontext_t" and
  36  * "ucontext_t" as all the necessary info is inside the former.
  37  */
  38
  39 struct __ia64_fpreg_mcontext
  40   {
  41     union
  42       {
  43         unsigned long __ctx(bits)[2];
  44       } __ctx(u);
  45   } __attribute__ ((__aligned__ (16)));
  46
  47 typedef struct
  48   {
  49     unsigned long int __ctx(sc_flags);
  50     unsigned long int __ctx(sc_nat);
  51     stack_t __ctx(sc_stack);
  52     unsigned long int __ctx(sc_ip);
  53     unsigned long int __ctx(sc_cfm);
  54     unsigned long int __ctx(sc_um);
  55     unsigned long int __ctx(sc_ar_rsc);
  56     unsigned long int __ctx(sc_ar_bsp);
  57     unsigned long int __ctx(sc_ar_rnat);
  58     unsigned long int __ctx(sc_ar_ccv);
  59     unsigned long int __ctx(sc_ar_unat);
  60     unsigned long int __ctx(sc_ar_fpsr);
  61     unsigned long int __ctx(sc_ar_pfs);
  62     unsigned long int __ctx(sc_ar_lc);
  63     unsigned long int __ctx(sc_pr);
  64     unsigned long int __ctx(sc_br)[8];
  65     unsigned long int __ctx(sc_gr)[32];
  66     struct __ia64_fpreg_mcontext __ctx(sc_fr)[128];
  67     unsigned long int __ctx(sc_rbs_base);
  68     unsigned long int __ctx(sc_loadrs);
  69     unsigned long int __ctx(sc_ar25);
  70     unsigned long int __ctx(sc_ar26);
  71     unsigned long int __ctx(sc_rsvd)[12];
  72     unsigned long int __ctx(sc_mask);
  73   } mcontext_t;
  74
  75 #if __GNUC_PREREQ (3, 5)
  76 # define _SC_GR0_OFFSET \
  77         __builtin_offsetof (mcontext_t, __ctx(sc_gr)[0])
  78 #elif defined __GNUC__
  79 # define _SC_GR0_OFFSET \
  80         (((char *) &((mcontext_t *) 0)->__ctx(sc_gr)[0]) - (char *) 0)
  81 #else
  82 # define _SC_GR0_OFFSET 0xc8    /* pray that this is correct... */
  83 #endif
  84
  85 typedef struct ucontext_t
  86   {
  87     union
  88       {
  89         mcontext_t _mc;
  90         struct
  91           {
  92             unsigned long _pad[_SC_GR0_OFFSET/8];
  93             struct ucontext_t *_link;   /* this should overlay sc_gr[0] */
  94           }
  95         _uc;
  96       }
  97     _u;
  98   }
  99 ucontext_t;
 100
 101 #define uc_mcontext     _u._mc
 102 #define uc_sigmask      _u._mc.__ctx(sc_mask)
 103 #define uc_stack        _u._mc.__ctx(sc_stack)
 104 #define uc_link         _u._uc._link
 105
 106 #endif /* sys/ucontext.h */