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 */