sysdeps/i386/sys/ucontext.h

   1 /* Copyright (C) 1997-2024 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 /* System V/i386 ABI compliant context switching support.  */
  19
  20 #ifndef _SYS_UCONTEXT_H
  21 #define _SYS_UCONTEXT_H 1
  22
  23 #include <features.h>
  24
  25 #include <bits/types/sigset_t.h>
  26 #include <bits/types/stack_t.h>
  27
  28
  29 /* Type for general register.  */
  30 typedef int greg_t;
  31
  32 /* Number of general registers.  */
  33 #define __NGREG 19
  34 #ifdef __USE_MISC
  35 # define NGREG  __NGREG
  36 #endif
  37
  38 /* Container for all general registers.  */
  39 typedef greg_t gregset_t[__NGREG];
  40
  41 #ifdef __USE_MISC
  42 /* Number of each register is the `gregset_t' array.  */
  43 enum
  44 {
  45   REG_GS = 0,
  46 # define REG_GS REG_GS
  47   REG_FS,
  48 # define REG_FS REG_FS
  49   REG_ES,
  50 # define REG_ES REG_ES
  51   REG_DS,
  52 # define REG_DS REG_DS
  53   REG_EDI,
  54 # define REG_EDI        REG_EDI
  55   REG_ESI,
  56 # define REG_ESI        REG_ESI
  57   REG_EBP,
  58 # define REG_EBP        REG_EBP
  59   REG_ESP,
  60 # define REG_ESP        REG_ESP
  61   REG_EBX,
  62 # define REG_EBX        REG_EBX
  63   REG_EDX,
  64 # define REG_EDX        REG_EDX
  65   REG_ECX,
  66 # define REG_ECX        REG_ECX
  67   REG_EAX,
  68 # define REG_EAX        REG_EAX
  69   REG_TRAPNO,
  70 # define REG_TRAPNO     REG_TRAPNO
  71   REG_ERR,
  72 # define REG_ERR        REG_ERR
  73   REG_EIP,
  74 # define REG_EIP        REG_EIP
  75   REG_CS,
  76 # define REG_CS REG_CS
  77   REG_EFL,
  78 # define REG_EFL        REG_EFL
  79   REG_UESP,
  80 # define REG_UESP       REG_UESP
  81   REG_SS
  82 # define REG_SS REG_SS
  83 };
  84 #endif
  85
  86 #ifdef __USE_MISC
  87 # define __ctx(fld) fld
  88 # define __ctxt(tag) tag
  89 #else
  90 # define __ctx(fld) __ ## fld
  91 # define __ctxt(tag) /* Empty.  */
  92 #endif
  93
  94 /* Structure to describe FPU registers.  */
  95 typedef struct
  96   {
  97     union
  98       {
  99         struct __ctxt(fpchip_state)
 100           {
 101             int __ctx(state)[27];
 102             int __ctx(status);
 103           } __ctx(fpchip_state);
 104
 105         struct __ctxt(fp_emul_space)
 106           {
 107             char __ctx(fp_emul)[246];
 108             char __ctx(fp_epad)[2];
 109           } __ctx(fp_emul_space);
 110
 111         int __ctx(f_fpregs)[62];
 112       } __ctx(fp_reg_set);
 113
 114     long int __ctx(f_wregs)[33];
 115   } fpregset_t;
 116
 117 /* Context to describe whole processor state.  */
 118 typedef struct
 119   {
 120     gregset_t __ctx(gregs);
 121     fpregset_t __ctx(fpregs);
 122   } mcontext_t;
 123
 124 /* Userlevel context.  */
 125 typedef struct ucontext_t
 126   {
 127     unsigned long int __ctx(uc_flags);
 128     struct ucontext_t *uc_link;
 129     sigset_t uc_sigmask;
 130     stack_t uc_stack;
 131     mcontext_t uc_mcontext;
 132     long int __glibc_reserved1[5];
 133   } ucontext_t;
 134
 135 #undef __ctx
 136 #undef __ctxt
 137
 138 #endif /* sys/ucontext.h */