[mirror_ubuntu-kernels.git] / arch / arm / include / asm / ucontext.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASMARM_UCONTEXT_H
#define _ASMARM_UCONTEXT_H

#include <asm/fpstate.h>

/*
 * struct sigcontext only has room for the basic registers, but struct
 * ucontext now has room for all registers which need to be saved and
 * restored.  Coprocessor registers are stored in uc_regspace.  Each
 * coprocessor's saved state should start with a documented 32-bit magic
 * number, followed by a 32-bit word giving the coproccesor's saved size.
 * uc_regspace may be expanded if necessary, although this takes some
 * coordination with glibc.
 */

struct ucontext {
	unsigned long	  uc_flags;
	struct ucontext  *uc_link;
	stack_t		  uc_stack;
	struct sigcontext uc_mcontext;
	sigset_t	  uc_sigmask;
	/* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
	int		  __unused[32 - (sizeof (sigset_t) / sizeof (int))];
	/* Last for extensibility.  Eight byte aligned because some
	   coprocessors require eight byte alignment.  */
 	unsigned long	  uc_regspace[128] __attribute__((__aligned__(8)));
};

#ifdef __KERNEL__

/*
 * Coprocessor save state.  The magic values and specific
 * coprocessor's layouts are part of the userspace ABI.  Each one of
 * these should be a multiple of eight bytes and aligned to eight
 * bytes, to prevent unpredictable padding in the signal frame.
 */

/*
 * Dummy padding block: if this magic is encountered, the block should
 * be skipped using the corresponding size field.
 */
#define DUMMY_MAGIC		0xb0d9ed01

#ifdef CONFIG_CRUNCH
#define CRUNCH_MAGIC		0x5065cf03
#define CRUNCH_STORAGE_SIZE	(CRUNCH_SIZE + 8)

struct crunch_sigframe {
	unsigned long	magic;
	unsigned long	size;
	struct crunch_state	storage;
} __attribute__((__aligned__(8)));
#endif

#ifdef CONFIG_IWMMXT
/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
#define IWMMXT_MAGIC		0x12ef842a
#define IWMMXT_STORAGE_SIZE	(IWMMXT_SIZE + 8)

struct iwmmxt_sigframe {
	unsigned long	magic;
	unsigned long	size;
	struct iwmmxt_struct storage;
} __attribute__((__aligned__(8)));
#endif /* CONFIG_IWMMXT */

#ifdef CONFIG_VFP
#define VFP_MAGIC		0x56465001

struct vfp_sigframe
{
	unsigned long		magic;
	unsigned long		size;
	struct user_vfp		ufp;
	struct user_vfp_exc	ufp_exc;
} __attribute__((__aligned__(8)));

/*
 *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
 *  4 bytes padding.
 */
#define VFP_STORAGE_SIZE	sizeof(struct vfp_sigframe)

#endif /* CONFIG_VFP */

/*
 * Auxiliary signal frame.  This saves stuff like FP state.
 * The layout of this structure is not part of the user ABI,
 * because the config options aren't.  uc_regspace is really
 * one of these.
 */
struct aux_sigframe {
#ifdef CONFIG_CRUNCH
	struct crunch_sigframe	crunch;
#endif
#ifdef CONFIG_IWMMXT
	struct iwmmxt_sigframe	iwmmxt;
#endif
#ifdef CONFIG_VFP
	struct vfp_sigframe	vfp;
#endif
	/* Something that isn't a valid magic number for any coprocessor.  */
	unsigned long		end_magic;
} __attribute__((__aligned__(8)));

#endif

#endif /* !_ASMARM_UCONTEXT_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ASMARM_UCONTEXT_H
	3	#define _ASMARM_UCONTEXT_H
	4
85fe0681 DJ	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
1da177e4 LT	17	struct ucontext {
	18	unsigned long uc_flags;
	19	struct ucontext *uc_link;
	20	stack_t uc_stack;
	21	struct sigcontext uc_mcontext;
85fe0681 DJ	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)));
1da177e4 LT	28	};
1da177e4 LT	29
85fe0681 DJ	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
ce184a0d DM	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
3bec6ded LB	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
85fe0681	56	#ifdef CONFIG_IWMMXT
25985edc	57	/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
85fe0681 DJ	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
85fe0681	69	#define VFP_MAGIC 0x56465001
85fe0681 DJ	70
	71	struct vfp_sigframe
	72	{
	73	unsigned long magic;
	74	unsigned long size;
82c6f5a5 ID	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
85fe0681 DJ	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 {
3bec6ded LB	94	#ifdef CONFIG_CRUNCH
	95	struct crunch_sigframe crunch;
	96	#endif
85fe0681 DJ	97	#ifdef CONFIG_IWMMXT
	98	struct iwmmxt_sigframe iwmmxt;
	99	#endif
82c6f5a5	100	#ifdef CONFIG_VFP
85fe0681 DJ	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
1da177e4	109	#endif /* !_ASMARM_UCONTEXT_H */