1  /* struct ucontext definition, RISC-V version.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* Don't rely on this, the interface is currently messed up and may need to
      20     be broken to be fixed.  */
      21  #ifndef _SYS_UCONTEXT_H
      22  #define _SYS_UCONTEXT_H	1
      23  
      24  #include <features.h>
      25  
      26  #include <bits/types/sigset_t.h>
      27  #include <bits/types/stack_t.h>
      28  
      29  typedef unsigned long int __riscv_mc_gp_state[32];
      30  
      31  #ifdef __USE_MISC
      32  # define NGREG	32
      33  
      34  # define REG_PC 0
      35  # define REG_RA 1
      36  # define REG_SP 2
      37  # define REG_TP 4
      38  # define REG_S0 8
      39  # define REG_S1 9
      40  # define REG_A0 10
      41  # define REG_S2 18
      42  # define REG_NARGS 8
      43  
      44  typedef unsigned long int greg_t;
      45  
      46  /* Container for all general registers.  */
      47  typedef __riscv_mc_gp_state gregset_t;
      48  
      49  /* Container for floating-point state.  */
      50  typedef union __riscv_mc_fp_state fpregset_t;
      51  #endif
      52  
      53  struct __riscv_mc_f_ext_state
      54    {
      55      unsigned int __f[32];
      56      unsigned int __fcsr;
      57    };
      58  
      59  struct __riscv_mc_d_ext_state
      60    {
      61      unsigned long long int __f[32];
      62      unsigned int __fcsr;
      63    };
      64  
      65  struct __riscv_mc_q_ext_state
      66    {
      67      unsigned long long int __f[64] __attribute__ ((__aligned__ (16)));
      68      unsigned int __fcsr;
      69      /* Reserved for expansion of sigcontext structure.  Currently zeroed
      70         upon signal, and must be zero upon sigreturn.  */
      71      unsigned int __glibc_reserved[3];
      72    };
      73  
      74  union __riscv_mc_fp_state
      75    {
      76      struct __riscv_mc_f_ext_state __f;
      77      struct __riscv_mc_d_ext_state __d;
      78      struct __riscv_mc_q_ext_state __q;
      79    };
      80  
      81  typedef struct mcontext_t
      82    {
      83      __riscv_mc_gp_state __gregs;
      84      union  __riscv_mc_fp_state __fpregs;
      85    } mcontext_t;
      86  
      87  /* Userlevel context.  */
      88  typedef struct ucontext_t
      89    {
      90      unsigned long int  __uc_flags;
      91      struct ucontext_t *uc_link;
      92      stack_t            uc_stack;
      93      sigset_t           uc_sigmask;
      94      /* There's some padding here to allow sigset_t to be expanded in the
      95         future.  Though this is unlikely, other architectures put uc_sigmask
      96         at the end of this structure and explicitly state it can be
      97         expanded, so we didn't want to box ourselves in here.  */
      98      char               __glibc_reserved[1024 / 8 - sizeof (sigset_t)];
      99      /* We can't put uc_sigmask at the end of this structure because we need
     100         to be able to expand sigcontext in the future.  For example, the
     101         vector ISA extension will almost certainly add ISA state.  We want
     102         to ensure all user-visible ISA state can be saved and restored via a
     103         ucontext, so we're putting this at the end in order to allow for
     104         infinite extensibility.  Since we know this will be extended and we
     105         assume sigset_t won't be extended an extreme amount, we're
     106         prioritizing this.  */
     107      mcontext_t uc_mcontext;
     108    } ucontext_t;
     109  
     110  #endif /* sys/ucontext.h */