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| 1 | /* struct ucontext definition, RISC-V version. |
|---|---|
| 2 | Copyright (C) 1997-2024 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 */ |
| 111 |
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