1  /* Copyright (C) 1997-2023 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 */