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, preceeded 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#if __LINUX_ARM_ARCH__ < 6
63/* For ARM pre-v6, we use fstmiax and fldmiax.  This adds one extra
64 * word after the registers, and a word of padding at the end for
65 * alignment.  */
66#define VFP_MAGIC		0x56465001
67#define VFP_STORAGE_SIZE	152
68#else
69#define VFP_MAGIC		0x56465002
70#define VFP_STORAGE_SIZE	144
71#endif
72
73struct vfp_sigframe
74{
75	unsigned long		magic;
76	unsigned long		size;
77	union vfp_state		storage;
78};
79#endif /* CONFIG_VFP */
80
81/*
82 * Auxiliary signal frame.  This saves stuff like FP state.
83 * The layout of this structure is not part of the user ABI,
84 * because the config options aren't.  uc_regspace is really
85 * one of these.
86 */
87struct aux_sigframe {
88#ifdef CONFIG_CRUNCH
89	struct crunch_sigframe	crunch;
90#endif
91#ifdef CONFIG_IWMMXT
92	struct iwmmxt_sigframe	iwmmxt;
93#endif
94#if 0 CONFIG_VFP     /* Not yet saved.  */
95	struct vfp_sigframe	vfp;
96#endif
97	/* Something that isn't a valid magic number for any coprocessor.  */
98	unsigned long		end_magic;
99} __attribute__((__aligned__(8)));
100
101#endif
102
103#endif /* !_ASMARM_UCONTEXT_H */
104