1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASMARM_UCONTEXT_H
3 #define _ASMARM_UCONTEXT_H
4
5 #include <asm/fpstate.h>
6 #include <asm/user.h>
7
8 /*
9 * struct sigcontext only has room for the basic registers, but struct
10 * ucontext now has room for all registers which need to be saved and
11 * restored. Coprocessor registers are stored in uc_regspace. Each
12 * coprocessor's saved state should start with a documented 32-bit magic
13 * number, followed by a 32-bit word giving the coproccesor's saved size.
14 * uc_regspace may be expanded if necessary, although this takes some
15 * coordination with glibc.
16 */
17
18 struct ucontext {
19 unsigned long uc_flags;
20 struct ucontext *uc_link;
21 stack_t uc_stack;
22 struct sigcontext uc_mcontext;
23 sigset_t uc_sigmask;
24 /* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */
25 int __unused[32 - (sizeof (sigset_t) / sizeof (int))];
26 /* Last for extensibility. Eight byte aligned because some
27 coprocessors require eight byte alignment. */
28 unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
29 };
30
31 #ifdef __KERNEL__
32
33 /*
34 * Coprocessor save state. The magic values and specific
35 * coprocessor's layouts are part of the userspace ABI. Each one of
36 * these should be a multiple of eight bytes and aligned to eight
37 * bytes, to prevent unpredictable padding in the signal frame.
38 */
39
40 /*
41 * Dummy padding block: if this magic is encountered, the block should
42 * be skipped using the corresponding size field.
43 */
44 #define DUMMY_MAGIC 0xb0d9ed01
45
46 #ifdef CONFIG_IWMMXT
47 /* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
48 #define IWMMXT_MAGIC 0x12ef842a
49 #define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8)
50
51 struct iwmmxt_sigframe {
52 unsigned long magic;
53 unsigned long size;
54 struct iwmmxt_struct storage;
55 } __attribute__((__aligned__(8)));
56 #endif /* CONFIG_IWMMXT */
57
58 #ifdef CONFIG_VFP
59 #define VFP_MAGIC 0x56465001
60
61 struct vfp_sigframe
62 {
63 unsigned long magic;
64 unsigned long size;
65 struct user_vfp ufp;
66 struct user_vfp_exc ufp_exc;
67 } __attribute__((__aligned__(8)));
68
69 /*
70 * 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
71 * 4 bytes padding.
72 */
73 #define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe)
74
75 #endif /* CONFIG_VFP */
76
77 /*
78 * Auxiliary signal frame. This saves stuff like FP state.
79 * The layout of this structure is not part of the user ABI,
80 * because the config options aren't. uc_regspace is really
81 * one of these.
82 */
83 struct aux_sigframe {
84 #ifdef CONFIG_IWMMXT
85 struct iwmmxt_sigframe iwmmxt;
86 #endif
87 #ifdef CONFIG_VFP
88 struct vfp_sigframe vfp;
89 #endif
90 /* Something that isn't a valid magic number for any coprocessor. */
91 unsigned long end_magic;
92 } __attribute__((__aligned__(8)));
93
94 #endif
95
96 #endif /* !_ASMARM_UCONTEXT_H */
97
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