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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASMARM_UCONTEXT_H
2#define _ASMARM_UCONTEXT_H
3
Daniel Jacobowitz85fe0682006-06-24 23:46:21 +01004#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070016struct ucontext {
17 unsigned long uc_flags;
18 struct ucontext *uc_link;
19 stack_t uc_stack;
20 struct sigcontext uc_mcontext;
Daniel Jacobowitz85fe0682006-06-24 23:46:21 +010021 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)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070027};
28
Daniel Jacobowitz85fe0682006-06-24 23:46:21 +010029#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
Lennert Buytenhek3bec6ded2006-06-27 22:56:18 +010038#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
Daniel Jacobowitz85fe0682006-06-24 23:46:21 +010049#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 {
Lennert Buytenhek3bec6ded2006-06-27 22:56:18 +010088#ifdef CONFIG_CRUNCH
89 struct crunch_sigframe crunch;
90#endif
Daniel Jacobowitz85fe0682006-06-24 23:46:21 +010091#ifdef CONFIG_IWMMXT
92 struct iwmmxt_sigframe iwmmxt;
93#endif
94#if 0 && defined 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#endif /* !_ASMARM_UCONTEXT_H */