1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef __MIPS_UAPI_ASM_UCONTEXT_H 3 #define __MIPS_UAPI_ASM_UCONTEXT_H 4 5 /** 6 * struct extcontext - extended context header structure 7 * @magic: magic value identifying the type of extended context 8 * @size: the size in bytes of the enclosing structure 9 * 10 * Extended context structures provide context which does not fit within struct 11 * sigcontext. They are placed sequentially in memory at the end of struct 12 * ucontext and struct sigframe, with each extended context structure beginning 13 * with a header defined by this struct. The type of context represented is 14 * indicated by the magic field. Userland may check each extended context 15 * structure against magic values that it recognises. The size field allows any 16 * unrecognised context to be skipped, allowing for future expansion. The end 17 * of the extended context data is indicated by the magic value 18 * END_EXTCONTEXT_MAGIC. 19 */ 20 struct extcontext { 21 unsigned int magic; 22 unsigned int size; 23 }; 24 25 /** 26 * struct msa_extcontext - MSA extended context structure 27 * @ext: the extended context header, with magic == MSA_EXTCONTEXT_MAGIC 28 * @wr: the most significant 64 bits of each MSA vector register 29 * @csr: the value of the MSA control & status register 30 * 31 * If MSA context is live for a task at the time a signal is delivered to it, 32 * this structure will hold the MSA context of the task as it was prior to the 33 * signal delivery. 34 */ 35 struct msa_extcontext { 36 struct extcontext ext; 37 #define MSA_EXTCONTEXT_MAGIC 0x784d5341 /* xMSA */ 38 39 unsigned long long wr[32]; 40 unsigned int csr; 41 }; 42 43 #define END_EXTCONTEXT_MAGIC 0x78454e44 /* xEND */ 44 45 /** 46 * struct ucontext - user context structure 47 * @uc_flags: 48 * @uc_link: 49 * @uc_stack: 50 * @uc_mcontext: holds basic processor state 51 * @uc_sigmask: 52 * @uc_extcontext: holds extended processor state 53 */ 54 struct ucontext { 55 /* Historic fields matching asm-generic */ 56 unsigned long uc_flags; 57 struct ucontext *uc_link; 58 stack_t uc_stack; 59 struct sigcontext uc_mcontext; 60 sigset_t uc_sigmask; 61 62 /* Extended context structures may follow ucontext */ 63 unsigned long long uc_extcontext[0]; 64 }; 65 66 #endif /* __MIPS_UAPI_ASM_UCONTEXT_H */ 67