1  /* Copyright (C) 1998-2023 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/ARM 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  #ifdef __USE_MISC
      30  # define __ctx(fld) fld
      31  #else
      32  # define __ctx(fld) __ ## fld
      33  #endif
      34  
      35  #ifdef __USE_MISC
      36  typedef int greg_t;
      37  
      38  /* Number of general registers.  */
      39  # define NGREG	18
      40  
      41  /* Container for all general registers.  */
      42  typedef greg_t gregset_t[NGREG];
      43  
      44  /* Number of each register is the `gregset_t' array.  */
      45  enum
      46  {
      47    REG_R0 = 0,
      48  # define REG_R0	REG_R0
      49    REG_R1 = 1,
      50  # define REG_R1	REG_R1
      51    REG_R2 = 2,
      52  # define REG_R2	REG_R2
      53    REG_R3 = 3,
      54  # define REG_R3	REG_R3
      55    REG_R4 = 4,
      56  # define REG_R4	REG_R4
      57    REG_R5 = 5,
      58  # define REG_R5	REG_R5
      59    REG_R6 = 6,
      60  # define REG_R6	REG_R6
      61    REG_R7 = 7,
      62  # define REG_R7	REG_R7
      63    REG_R8 = 8,
      64  # define REG_R8	REG_R8
      65    REG_R9 = 9,
      66  # define REG_R9	REG_R9
      67    REG_R10 = 10,
      68  # define REG_R10	REG_R10
      69    REG_R11 = 11,
      70  # define REG_R11	REG_R11
      71    REG_R12 = 12,
      72  # define REG_R12	REG_R12
      73    REG_R13 = 13,
      74  # define REG_R13	REG_R13
      75    REG_R14 = 14,
      76  # define REG_R14	REG_R14
      77    REG_R15 = 15
      78  # define REG_R15	REG_R15
      79  };
      80  
      81  struct _libc_fpstate
      82  {
      83    struct
      84    {
      85      unsigned int sign1:1;
      86      unsigned int unused:15;
      87      unsigned int sign2:1;
      88      unsigned int exponent:14;
      89      unsigned int j:1;
      90      unsigned int mantissa1:31;
      91      unsigned int mantissa0:32;
      92    } fpregs[8];
      93    unsigned int fpsr:32;
      94    unsigned int fpcr:32;
      95    unsigned char ftype[8];
      96    unsigned int init_flag;
      97  };
      98  /* Structure to describe FPU registers.  */
      99  typedef struct _libc_fpstate fpregset_t;
     100  #endif
     101  
     102  /* Context to describe whole processor state.  This only describes
     103     the core registers; coprocessor registers get saved elsewhere
     104     (e.g. in uc_regspace, or somewhere unspecified on the stack
     105     during non-RT signal handlers).  */
     106  typedef struct
     107    {
     108      unsigned long int __ctx(trap_no);
     109      unsigned long int __ctx(error_code);
     110      unsigned long int __ctx(oldmask);
     111      unsigned long int __ctx(arm_r0);
     112      unsigned long int __ctx(arm_r1);
     113      unsigned long int __ctx(arm_r2);
     114      unsigned long int __ctx(arm_r3);
     115      unsigned long int __ctx(arm_r4);
     116      unsigned long int __ctx(arm_r5);
     117      unsigned long int __ctx(arm_r6);
     118      unsigned long int __ctx(arm_r7);
     119      unsigned long int __ctx(arm_r8);
     120      unsigned long int __ctx(arm_r9);
     121      unsigned long int __ctx(arm_r10);
     122      unsigned long int __ctx(arm_fp);
     123      unsigned long int __ctx(arm_ip);
     124      unsigned long int __ctx(arm_sp);
     125      unsigned long int __ctx(arm_lr);
     126      unsigned long int __ctx(arm_pc);
     127      unsigned long int __ctx(arm_cpsr);
     128      unsigned long int __ctx(fault_address);
     129    } mcontext_t;
     130  
     131  /* Userlevel context.  */
     132  typedef struct ucontext_t
     133    {
     134      unsigned long __ctx(uc_flags);
     135      struct ucontext_t *uc_link;
     136      stack_t uc_stack;
     137      mcontext_t uc_mcontext;
     138      sigset_t uc_sigmask;
     139      unsigned long __ctx(uc_regspace)[128] __attribute__((__aligned__(8)));
     140    } ucontext_t;
     141  
     142  #undef __ctx
     143  
     144  #endif /* sys/ucontext.h */