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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASMARM_UCONTEXT_H
#define _ASMARM_UCONTEXT_H
#include <asm/fpstate.h>
#include <asm/user.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_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_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 */
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