LXR linux/arch/arm/include/asm/ucontext.h

   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, preceded 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#define VFP_MAGIC               0x56465001
  63
  64struct vfp_sigframe
  65{
  66        unsigned long           magic;
  67        unsigned long           size;
  68        struct user_vfp         ufp;
  69        struct user_vfp_exc     ufp_exc;
  70} __attribute__((__aligned__(8)));
  71
  72/*
  73 *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
  74 *  4 bytes padding.
  75 */
  76#define VFP_STORAGE_SIZE        sizeof(struct vfp_sigframe)
  77
  78#endif /* CONFIG_VFP */
  79
  80/*
  81 * Auxiliary signal frame.  This saves stuff like FP state.
  82 * The layout of this structure is not part of the user ABI,
  83 * because the config options aren't.  uc_regspace is really
  84 * one of these.
  85 */
  86struct aux_sigframe {
  87#ifdef CONFIG_CRUNCH
  88        struct crunch_sigframe  crunch;
  89#endif
  90#ifdef CONFIG_IWMMXT
  91        struct iwmmxt_sigframe  iwmmxt;
  92#endif
  93#ifdef CONFIG_VFP
  94        struct vfp_sigframe     vfp;
  95#endif
  96        /* Something that isn't a valid magic number for any coprocessor.  */
  97        unsigned long           end_magic;
  98} __attribute__((__aligned__(8)));
  99
 100#endif
 101
 102#endif /* !_ASMARM_UCONTEXT_H */
 103