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