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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef __MIPS_UAPI_ASM_UCONTEXT_H #define __MIPS_UAPI_ASM_UCONTEXT_H /** * struct extcontext - extended context header structure * @magic: magic value identifying the type of extended context * @size: the size in bytes of the enclosing structure * * Extended context structures provide context which does not fit within struct * sigcontext. They are placed sequentially in memory at the end of struct * ucontext and struct sigframe, with each extended context structure beginning * with a header defined by this struct. The type of context represented is * indicated by the magic field. Userland may check each extended context * structure against magic values that it recognises. The size field allows any * unrecognised context to be skipped, allowing for future expansion. The end * of the extended context data is indicated by the magic value * END_EXTCONTEXT_MAGIC. */ struct extcontext { unsigned int magic; unsigned int size; }; /** * struct msa_extcontext - MSA extended context structure * @ext: the extended context header, with magic == MSA_EXTCONTEXT_MAGIC * @wr: the most significant 64 bits of each MSA vector register * @csr: the value of the MSA control & status register * * If MSA context is live for a task at the time a signal is delivered to it, * this structure will hold the MSA context of the task as it was prior to the * signal delivery. */ struct msa_extcontext { struct extcontext ext; #define MSA_EXTCONTEXT_MAGIC 0x784d5341 /* xMSA */ unsigned long long wr[32]; unsigned int csr; }; #define END_EXTCONTEXT_MAGIC 0x78454e44 /* xEND */ /** * struct ucontext - user context structure * @uc_flags: * @uc_link: * @uc_stack: * @uc_mcontext: holds basic processor state * @uc_sigmask: * @uc_extcontext: holds extended processor state */ struct ucontext { /* Historic fields matching asm-generic */ unsigned long uc_flags; struct ucontext *uc_link; stack_t uc_stack; struct sigcontext uc_mcontext; sigset_t uc_sigmask; /* Extended context structures may follow ucontext */ unsigned long long uc_extcontext[0]; }; #endif /* __MIPS_UAPI_ASM_UCONTEXT_H */
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