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