arch/arm/include/asm/ucontext.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASMARM_UCONTEXT_H
   3 #define _ASMARM_UCONTEXT_H
   4
   5 #include <asm/fpstate.h>
   6
   7 /*
   8  * struct sigcontext only has room for the basic registers, but struct
   9  * ucontext now has room for all registers which need to be saved and
  10  * restored.  Coprocessor registers are stored in uc_regspace.  Each
  11  * coprocessor's saved state should start with a documented 32-bit magic
  12  * number, followed by a 32-bit word giving the coproccesor's saved size.
  13  * uc_regspace may be expanded if necessary, although this takes some
  14  * coordination with glibc.
  15  */
  16
  17 struct ucontext {
  18         unsigned long     uc_flags;
  19         struct ucontext  *uc_link;
  20         stack_t           uc_stack;
  21         struct sigcontext uc_mcontext;
  22         sigset_t          uc_sigmask;
  23         /* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
  24         int               __unused[32 - (sizeof (sigset_t) / sizeof (int))];
  25         /* Last for extensibility.  Eight byte aligned because some
  26            coprocessors require eight byte alignment.  */
  27         unsigned long     uc_regspace[128] __attribute__((__aligned__(8)));
  28 };
  29
  30 #ifdef __KERNEL__
  31
  32 /*
  33  * Coprocessor save state.  The magic values and specific
  34  * coprocessor's layouts are part of the userspace ABI.  Each one of
  35  * these should be a multiple of eight bytes and aligned to eight
  36  * bytes, to prevent unpredictable padding in the signal frame.
  37  */
  38
  39 /*
  40  * Dummy padding block: if this magic is encountered, the block should
  41  * be skipped using the corresponding size field.
  42  */
  43 #define DUMMY_MAGIC             0xb0d9ed01
  44
  45 #ifdef CONFIG_CRUNCH
  46 #define CRUNCH_MAGIC            0x5065cf03
  47 #define CRUNCH_STORAGE_SIZE     (CRUNCH_SIZE + 8)
  48
  49 struct crunch_sigframe {
  50         unsigned long   magic;
  51         unsigned long   size;
  52         struct crunch_state     storage;
  53 } __attribute__((__aligned__(8)));
  54 #endif
  55
  56 #ifdef CONFIG_IWMMXT
  57 /* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
  58 #define IWMMXT_MAGIC            0x12ef842a
  59 #define IWMMXT_STORAGE_SIZE     (IWMMXT_SIZE + 8)
  60
  61 struct iwmmxt_sigframe {
  62         unsigned long   magic;
  63         unsigned long   size;
  64         struct iwmmxt_struct storage;
  65 } __attribute__((__aligned__(8)));
  66 #endif /* CONFIG_IWMMXT */
  67
  68 #ifdef CONFIG_VFP
  69 #define VFP_MAGIC               0x56465001
  70
  71 struct vfp_sigframe
  72 {
  73         unsigned long           magic;
  74         unsigned long           size;
  75         struct user_vfp         ufp;
  76         struct user_vfp_exc     ufp_exc;
  77 } __attribute__((__aligned__(8)));
  78
  79 /*
  80  *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
  81  *  4 bytes padding.
  82  */
  83 #define VFP_STORAGE_SIZE        sizeof(struct vfp_sigframe)
  84
  85 #endif /* CONFIG_VFP */
  86
  87 /*
  88  * Auxiliary signal frame.  This saves stuff like FP state.
  89  * The layout of this structure is not part of the user ABI,
  90  * because the config options aren't.  uc_regspace is really
  91  * one of these.
  92  */
  93 struct aux_sigframe {
  94 #ifdef CONFIG_CRUNCH
  95         struct crunch_sigframe  crunch;
  96 #endif
  97 #ifdef CONFIG_IWMMXT
  98         struct iwmmxt_sigframe  iwmmxt;
  99 #endif
 100 #ifdef CONFIG_VFP
 101         struct vfp_sigframe     vfp;
 102 #endif
 103         /* Something that isn't a valid magic number for any coprocessor.  */
 104         unsigned long           end_magic;
 105 } __attribute__((__aligned__(8)));
 106
 107 #endif
 108
 109 #endif /* !_ASMARM_UCONTEXT_H */