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Linux/arch/arm/include/asm/ucontext.h

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  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 */
111 

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