| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| 2 | #ifndef __LOONGARCH_UAPI_ASM_UCONTEXT_H |
| 3 | #define __LOONGARCH_UAPI_ASM_UCONTEXT_H |
| 4 | |
| 5 | /** |
| 6 | * struct ucontext - user context structure |
| 7 | * @uc_flags: |
| 8 | * @uc_link: |
| 9 | * @uc_stack: |
| 10 | * @uc_mcontext: holds basic processor state |
| 11 | * @uc_sigmask: |
| 12 | * @uc_extcontext: holds extended processor state |
| 13 | */ |
| 14 | struct ucontext { |
| 15 | unsigned long uc_flags; |
| 16 | struct ucontext *uc_link; |
| 17 | stack_t uc_stack; |
| 18 | sigset_t uc_sigmask; |
| 19 | /* There's some padding here to allow sigset_t to be expanded in the |
| 20 | * future. Though this is unlikely, other architectures put uc_sigmask |
| 21 | * at the end of this structure and explicitly state it can be |
| 22 | * expanded, so we didn't want to box ourselves in here. */ |
| 23 | __u8 __unused[1024 / 8 - sizeof(sigset_t)]; |
| 24 | /* We can't put uc_sigmask at the end of this structure because we need |
| 25 | * to be able to expand sigcontext in the future. For example, the |
| 26 | * vector ISA extension will almost certainly add ISA state. We want |
| 27 | * to ensure all user-visible ISA state can be saved and restored via a |
| 28 | * ucontext, so we're putting this at the end in order to allow for |
| 29 | * infinite extensibility. Since we know this will be extended and we |
| 30 | * assume sigset_t won't be extended an extreme amount, we're |
| 31 | * prioritizing this. */ |
| 32 | struct sigcontext uc_mcontext; |
| 33 | }; |
| 34 | |
| 35 | #endif /* __LOONGARCH_UAPI_ASM_UCONTEXT_H */ |