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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
18struct 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
51struct 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
61struct 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 */
83struct 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 */
1#ifndef _ASMARM_UCONTEXT_H
2#define _ASMARM_UCONTEXT_H
3
4#include <asm/fpstate.h>
5
6/*
7 * struct sigcontext only has room for the basic registers, but struct
8 * ucontext now has room for all registers which need to be saved and
9 * restored. Coprocessor registers are stored in uc_regspace. Each
10 * coprocessor's saved state should start with a documented 32-bit magic
11 * number, followed by a 32-bit word giving the coproccesor's saved size.
12 * uc_regspace may be expanded if necessary, although this takes some
13 * coordination with glibc.
14 */
15
16struct ucontext {
17 unsigned long uc_flags;
18 struct ucontext *uc_link;
19 stack_t uc_stack;
20 struct sigcontext uc_mcontext;
21 sigset_t uc_sigmask;
22 /* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */
23 int __unused[32 - (sizeof (sigset_t) / sizeof (int))];
24 /* Last for extensibility. Eight byte aligned because some
25 coprocessors require eight byte alignment. */
26 unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
27};
28
29#ifdef __KERNEL__
30
31/*
32 * Coprocessor save state. The magic values and specific
33 * coprocessor's layouts are part of the userspace ABI. Each one of
34 * these should be a multiple of eight bytes and aligned to eight
35 * bytes, to prevent unpredictable padding in the signal frame.
36 */
37
38#ifdef CONFIG_CRUNCH
39#define CRUNCH_MAGIC 0x5065cf03
40#define CRUNCH_STORAGE_SIZE (CRUNCH_SIZE + 8)
41
42struct crunch_sigframe {
43 unsigned long magic;
44 unsigned long size;
45 struct crunch_state storage;
46} __attribute__((__aligned__(8)));
47#endif
48
49#ifdef CONFIG_IWMMXT
50/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
51#define IWMMXT_MAGIC 0x12ef842a
52#define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8)
53
54struct iwmmxt_sigframe {
55 unsigned long magic;
56 unsigned long size;
57 struct iwmmxt_struct storage;
58} __attribute__((__aligned__(8)));
59#endif /* CONFIG_IWMMXT */
60
61#ifdef CONFIG_VFP
62#define VFP_MAGIC 0x56465001
63
64struct vfp_sigframe
65{
66 unsigned long magic;
67 unsigned long size;
68 struct user_vfp ufp;
69 struct user_vfp_exc ufp_exc;
70} __attribute__((__aligned__(8)));
71
72/*
73 * 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
74 * 4 bytes padding.
75 */
76#define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe)
77
78#endif /* CONFIG_VFP */
79
80/*
81 * Auxiliary signal frame. This saves stuff like FP state.
82 * The layout of this structure is not part of the user ABI,
83 * because the config options aren't. uc_regspace is really
84 * one of these.
85 */
86struct aux_sigframe {
87#ifdef CONFIG_CRUNCH
88 struct crunch_sigframe crunch;
89#endif
90#ifdef CONFIG_IWMMXT
91 struct iwmmxt_sigframe iwmmxt;
92#endif
93#ifdef CONFIG_VFP
94 struct vfp_sigframe vfp;
95#endif
96 /* Something that isn't a valid magic number for any coprocessor. */
97 unsigned long end_magic;
98} __attribute__((__aligned__(8)));
99
100#endif
101
102#endif /* !_ASMARM_UCONTEXT_H */