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#include <asm/fpstate.h>

 * struct sigcontext only has room for the basic registers, but struct
 * ucontext now has room for all registers which need to be saved and
 * restored.  Coprocessor registers are stored in uc_regspace.  Each
 * coprocessor's saved state should start with a documented 32-bit magic
 * number, followed by a 32-bit word giving the coproccesor's saved size.
 * uc_regspace may be expanded if necessary, although this takes some
 * coordination with glibc.

struct ucontext {
      unsigned long       uc_flags;
      struct ucontext  *uc_link;
      stack_t             uc_stack;
      struct sigcontext uc_mcontext;
      sigset_t      uc_sigmask;
      /* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
      int           __unused[32 - (sizeof (sigset_t) / sizeof (int))];
      /* Last for extensibility.  Eight byte aligned because some
         coprocessors require eight byte alignment.  */
      unsigned long       uc_regspace[128] __attribute__((__aligned__(8)));

#ifdef __KERNEL__

 * Coprocessor save state.  The magic values and specific
 * coprocessor's layouts are part of the userspace ABI.  Each one of
 * these should be a multiple of eight bytes and aligned to eight
 * bytes, to prevent unpredictable padding in the signal frame.

#define CRUNCH_MAGIC          0x5065cf03

struct crunch_sigframe {
      unsigned long     magic;
      unsigned long     size;
      struct crunch_state     storage;
} __attribute__((__aligned__(8)));

/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
#define IWMMXT_MAGIC          0x12ef842a

struct iwmmxt_sigframe {
      unsigned long     magic;
      unsigned long     size;
      struct iwmmxt_struct storage;
} __attribute__((__aligned__(8)));
#endif /* CONFIG_IWMMXT */

#define VFP_MAGIC       0x56465001

struct vfp_sigframe
      unsigned long           magic;
      unsigned long           size;
      struct user_vfp         ufp;
      struct user_vfp_exc     ufp_exc;
} __attribute__((__aligned__(8)));

 *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
 *  4 bytes padding.
#define VFP_STORAGE_SIZE      sizeof(struct vfp_sigframe)

#endif /* CONFIG_VFP */

 * Auxiliary signal frame.  This saves stuff like FP state.
 * The layout of this structure is not part of the user ABI,
 * because the config options aren't.  uc_regspace is really
 * one of these.
struct aux_sigframe {
      struct crunch_sigframe  crunch;
      struct iwmmxt_sigframe  iwmmxt;
      struct vfp_sigframe     vfp;
      /* Something that isn't a valid magic number for any coprocessor.  */
      unsigned long           end_magic;
} __attribute__((__aligned__(8)));


#endif /* !_ASMARM_UCONTEXT_H */

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