1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun #ifndef __MIPS_UAPI_ASM_UCONTEXT_H 3*4882a593Smuzhiyun #define __MIPS_UAPI_ASM_UCONTEXT_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /** 6*4882a593Smuzhiyun * struct extcontext - extended context header structure 7*4882a593Smuzhiyun * @magic: magic value identifying the type of extended context 8*4882a593Smuzhiyun * @size: the size in bytes of the enclosing structure 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * Extended context structures provide context which does not fit within struct 11*4882a593Smuzhiyun * sigcontext. They are placed sequentially in memory at the end of struct 12*4882a593Smuzhiyun * ucontext and struct sigframe, with each extended context structure beginning 13*4882a593Smuzhiyun * with a header defined by this struct. The type of context represented is 14*4882a593Smuzhiyun * indicated by the magic field. Userland may check each extended context 15*4882a593Smuzhiyun * structure against magic values that it recognises. The size field allows any 16*4882a593Smuzhiyun * unrecognised context to be skipped, allowing for future expansion. The end 17*4882a593Smuzhiyun * of the extended context data is indicated by the magic value 18*4882a593Smuzhiyun * END_EXTCONTEXT_MAGIC. 19*4882a593Smuzhiyun */ 20*4882a593Smuzhiyun struct extcontext { 21*4882a593Smuzhiyun unsigned int magic; 22*4882a593Smuzhiyun unsigned int size; 23*4882a593Smuzhiyun }; 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /** 26*4882a593Smuzhiyun * struct msa_extcontext - MSA extended context structure 27*4882a593Smuzhiyun * @ext: the extended context header, with magic == MSA_EXTCONTEXT_MAGIC 28*4882a593Smuzhiyun * @wr: the most significant 64 bits of each MSA vector register 29*4882a593Smuzhiyun * @csr: the value of the MSA control & status register 30*4882a593Smuzhiyun * 31*4882a593Smuzhiyun * If MSA context is live for a task at the time a signal is delivered to it, 32*4882a593Smuzhiyun * this structure will hold the MSA context of the task as it was prior to the 33*4882a593Smuzhiyun * signal delivery. 34*4882a593Smuzhiyun */ 35*4882a593Smuzhiyun struct msa_extcontext { 36*4882a593Smuzhiyun struct extcontext ext; 37*4882a593Smuzhiyun #define MSA_EXTCONTEXT_MAGIC 0x784d5341 /* xMSA */ 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun unsigned long long wr[32]; 40*4882a593Smuzhiyun unsigned int csr; 41*4882a593Smuzhiyun }; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun #define END_EXTCONTEXT_MAGIC 0x78454e44 /* xEND */ 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /** 46*4882a593Smuzhiyun * struct ucontext - user context structure 47*4882a593Smuzhiyun * @uc_flags: 48*4882a593Smuzhiyun * @uc_link: 49*4882a593Smuzhiyun * @uc_stack: 50*4882a593Smuzhiyun * @uc_mcontext: holds basic processor state 51*4882a593Smuzhiyun * @uc_sigmask: 52*4882a593Smuzhiyun * @uc_extcontext: holds extended processor state 53*4882a593Smuzhiyun */ 54*4882a593Smuzhiyun struct ucontext { 55*4882a593Smuzhiyun /* Historic fields matching asm-generic */ 56*4882a593Smuzhiyun unsigned long uc_flags; 57*4882a593Smuzhiyun struct ucontext *uc_link; 58*4882a593Smuzhiyun stack_t uc_stack; 59*4882a593Smuzhiyun struct sigcontext uc_mcontext; 60*4882a593Smuzhiyun sigset_t uc_sigmask; 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun /* Extended context structures may follow ucontext */ 63*4882a593Smuzhiyun unsigned long long uc_extcontext[0]; 64*4882a593Smuzhiyun }; 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun #endif /* __MIPS_UAPI_ASM_UCONTEXT_H */ 67