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 */ 36