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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 */