1*b74baf4aSHuacai Chen /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*b74baf4aSHuacai Chen #ifndef __LOONGARCH_UAPI_ASM_UCONTEXT_H 3*b74baf4aSHuacai Chen #define __LOONGARCH_UAPI_ASM_UCONTEXT_H 4*b74baf4aSHuacai Chen 5*b74baf4aSHuacai Chen /** 6*b74baf4aSHuacai Chen * struct ucontext - user context structure 7*b74baf4aSHuacai Chen * @uc_flags: 8*b74baf4aSHuacai Chen * @uc_link: 9*b74baf4aSHuacai Chen * @uc_stack: 10*b74baf4aSHuacai Chen * @uc_mcontext: holds basic processor state 11*b74baf4aSHuacai Chen * @uc_sigmask: 12*b74baf4aSHuacai Chen * @uc_extcontext: holds extended processor state 13*b74baf4aSHuacai Chen */ 14*b74baf4aSHuacai Chen struct ucontext { 15*b74baf4aSHuacai Chen unsigned long uc_flags; 16*b74baf4aSHuacai Chen struct ucontext *uc_link; 17*b74baf4aSHuacai Chen stack_t uc_stack; 18*b74baf4aSHuacai Chen sigset_t uc_sigmask; 19*b74baf4aSHuacai Chen /* There's some padding here to allow sigset_t to be expanded in the 20*b74baf4aSHuacai Chen * future. Though this is unlikely, other architectures put uc_sigmask 21*b74baf4aSHuacai Chen * at the end of this structure and explicitly state it can be 22*b74baf4aSHuacai Chen * expanded, so we didn't want to box ourselves in here. */ 23*b74baf4aSHuacai Chen __u8 __unused[1024 / 8 - sizeof(sigset_t)]; 24*b74baf4aSHuacai Chen /* We can't put uc_sigmask at the end of this structure because we need 25*b74baf4aSHuacai Chen * to be able to expand sigcontext in the future. For example, the 26*b74baf4aSHuacai Chen * vector ISA extension will almost certainly add ISA state. We want 27*b74baf4aSHuacai Chen * to ensure all user-visible ISA state can be saved and restored via a 28*b74baf4aSHuacai Chen * ucontext, so we're putting this at the end in order to allow for 29*b74baf4aSHuacai Chen * infinite extensibility. Since we know this will be extended and we 30*b74baf4aSHuacai Chen * assume sigset_t won't be extended an extreme amount, we're 31*b74baf4aSHuacai Chen * prioritizing this. */ 32*b74baf4aSHuacai Chen struct sigcontext uc_mcontext; 33*b74baf4aSHuacai Chen }; 34*b74baf4aSHuacai Chen 35*b74baf4aSHuacai Chen #endif /* __LOONGARCH_UAPI_ASM_UCONTEXT_H */ 36