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