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, 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 {
  88#ifdef CONFIG_CRUNCH
  89        struct crunch_sigframe  crunch;
  90#endif
  91#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
 103#endif /* !_ASMARM_UCONTEXT_H */
 104