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-rw-r--r--include/asm-arm/ucontext.h79
1 files changed, 78 insertions, 1 deletions
diff --git a/include/asm-arm/ucontext.h b/include/asm-arm/ucontext.h
index f853130137cc..9e6f7ca9f5ae 100644
--- a/include/asm-arm/ucontext.h
+++ b/include/asm-arm/ucontext.h
@@ -1,12 +1,89 @@
1#ifndef _ASMARM_UCONTEXT_H 1#ifndef _ASMARM_UCONTEXT_H
2#define _ASMARM_UCONTEXT_H 2#define _ASMARM_UCONTEXT_H
3 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
4struct ucontext { 16struct ucontext {
5 unsigned long uc_flags; 17 unsigned long uc_flags;
6 struct ucontext *uc_link; 18 struct ucontext *uc_link;
7 stack_t uc_stack; 19 stack_t uc_stack;
8 struct sigcontext uc_mcontext; 20 struct sigcontext uc_mcontext;
9 sigset_t uc_sigmask; /* mask last for extensibility */ 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)));
10}; 27};
11 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_IWMMXT
39/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
40#define IWMMXT_MAGIC 0x12ef842a
41#define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8)
42
43struct iwmmxt_sigframe {
44 unsigned long magic;
45 unsigned long size;
46 struct iwmmxt_struct storage;
47} __attribute__((__aligned__(8)));
48#endif /* CONFIG_IWMMXT */
49
50#ifdef CONFIG_VFP
51#if __LINUX_ARM_ARCH__ < 6
52/* For ARM pre-v6, we use fstmiax and fldmiax. This adds one extra
53 * word after the registers, and a word of padding at the end for
54 * alignment. */
55#define VFP_MAGIC 0x56465001
56#define VFP_STORAGE_SIZE 152
57#else
58#define VFP_MAGIC 0x56465002
59#define VFP_STORAGE_SIZE 144
60#endif
61
62struct vfp_sigframe
63{
64 unsigned long magic;
65 unsigned long size;
66 union vfp_state storage;
67};
68#endif /* CONFIG_VFP */
69
70/*
71 * Auxiliary signal frame. This saves stuff like FP state.
72 * The layout of this structure is not part of the user ABI,
73 * because the config options aren't. uc_regspace is really
74 * one of these.
75 */
76struct aux_sigframe {
77#ifdef CONFIG_IWMMXT
78 struct iwmmxt_sigframe iwmmxt;
79#endif
80#if 0 && defined CONFIG_VFP /* Not yet saved. */
81 struct vfp_sigframe vfp;
82#endif
83 /* Something that isn't a valid magic number for any coprocessor. */
84 unsigned long end_magic;
85} __attribute__((__aligned__(8)));
86
87#endif
88
12#endif /* !_ASMARM_UCONTEXT_H */ 89#endif /* !_ASMARM_UCONTEXT_H */