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#ifndef _UAPI_ASM_X86_SIGCONTEXT_H

#define _UAPI_ASM_X86_SIGCONTEXT_H

/*

 * Linux signal context definitions. The sigcontext includes a complex

 * hierarchy of CPU and FPU state, available to user-space (on the stack) when

 * a signal handler is executed.

 *

 * As over the years this ABI grew from its very simple roots towards

 * supporting more and more CPU state organically, some of the details (which

 * were rather clever hacks back in the days) became a bit quirky by today.

 *

 * The current ABI includes flexible provisions for future extensions, so we

 * won't have to grow new quirks for quite some time. Promise!

 */

#include 

#include 

#define FP_XSTATE_MAGIC1		0x46505853U

#define FP_XSTATE_MAGIC2		0x46505845U

#define FP_XSTATE_MAGIC2_SIZE		sizeof(FP_XSTATE_MAGIC2)

/*

 * Bytes 464..511 in the current 512-byte layout of the FXSAVE/FXRSTOR frame

 * are reserved for SW usage. On CPUs supporting XSAVE/XRSTOR, these bytes are

 * used to extend the fpstate pointer in the sigcontext, which now includes the

 * extended state information along with fpstate information.

 *

 * If sw_reserved.magic1 == FP_XSTATE_MAGIC1 then there's a

 * sw_reserved.extended_size bytes large extended context area present. (The

 * last 32-bit word of this extended area (at the

 * fpstate+extended_size-FP_XSTATE_MAGIC2_SIZE address) is set to

 * FP_XSTATE_MAGIC2 so that you can sanity check your size calculations.)

 *

 * This extended area typically grows with newer CPUs that have larger and

 * larger XSAVE areas.

 */

struct _fpx_sw_bytes {

	/*

	 * If set to FP_XSTATE_MAGIC1 then this is an xstate context.

	 * 0 if a legacy frame.

	 */

	__u32				magic1;

	/*

	 * Total size of the fpstate area:

	 *

	 *  - if magic1 == 0 then it's sizeof(struct _fpstate)

	 *  - if magic1 == FP_XSTATE_MAGIC1 then it's sizeof(struct _xstate)

	 *    plus extensions (if any)

	 */

	__u32				extended_size;

	/*

	 * Feature bit mask (including FP/SSE/extended state) that is present

	 * in the memory layout:

	 */

	__u64				xfeatures;

	/*

	 * Actual XSAVE state size, based on the xfeatures saved in the layout.

	 * 'extended_size' is greater than 'xstate_size':

	 */

	__u32				xstate_size;

	/* For future use: */

	__u32				padding[7];

};

/*

 * As documented in the iBCS2 standard:

 *

 * The first part of "struct _fpstate" is just the normal i387 hardware setup,

 * the extra "status" word is used to save the coprocessor status word before

 * entering the handler.

 *

 * The FPU state data structure has had to grow to accommodate the extended FPU

 * state required by the Streaming SIMD Extensions.  There is no documented

 * standard to accomplish this at the moment.

 */

/* 10-byte legacy floating point register: */

struct _fpreg {

	__u16				significand[4];

	__u16				exponent;

};

/* 16-byte floating point register: */

struct _fpxreg {

	__u16				significand[4];

	__u16				exponent;

	__u16				padding[3];

};

/* 16-byte XMM register: */

struct _xmmreg {

	__u32				element[4];

};

#define X86_FXSR_MAGIC			0x0000

/*

 * The 32-bit FPU frame:

 */

struct _fpstate_32 {

	/* Legacy FPU environment: */

	__u32				cw;

	__u32				sw;

	__u32				tag;

	__u32				ipoff;

	__u32				cssel;

	__u32				dataoff;

	__u32				datasel;

	struct _fpreg			_st[8];

	__u16				status;

	__u16				magic;		/* 0xffff: regular FPU data only */

							/* 0x0000: FXSR FPU data */

	/* FXSR FPU environment */

	__u32				_fxsr_env[6];	/* FXSR FPU env is ignored */

	__u32				mxcsr;

	__u32				reserved;

	struct _fpxreg			_fxsr_st[8];	/* FXSR FPU reg data is ignored */

	struct _xmmreg			_xmm[8];	/* First 8 XMM registers */

	union {

		__u32			padding1[44];	/* Second 8 XMM registers plus padding */

		__u32			padding[44];	/* Alias name for old user-space */

	};

	union {

		__u32			padding2[12];

		struct _fpx_sw_bytes	sw_reserved;	/* Potential extended state is encoded here */

	};

};

/*

 * The 64-bit FPU frame. (FXSAVE format and later)

 *

 * Note1: If sw_reserved.magic1 == FP_XSTATE_MAGIC1 then the structure is

 *        larger: 'struct _xstate'. Note that 'struct _xstate' embedds

 *        'struct _fpstate' so that you can always assume the _fpstate portion

 *        exists so that you can check the magic value.

 *

 * Note2: Reserved fields may someday contain valuable data. Always

 *	  save/restore them when you change signal frames.

 */

struct _fpstate_64 {

	__u16				cwd;

	__u16				swd;

	/* Note this is not the same as the 32-bit/x87/FSAVE twd: */

	__u16				twd;

	__u16				fop;

	__u64				rip;

	__u64				rdp;

	__u32				mxcsr;

	__u32				mxcsr_mask;

	__u32				st_space[32];	/*  8x  FP registers, 16 bytes each */

	__u32				xmm_space[64];	/* 16x XMM registers, 16 bytes each */

	__u32				reserved2[12];

	union {

		__u32			reserved3[12];

		struct _fpx_sw_bytes	sw_reserved;	/* Potential extended state is encoded here */

	};

};

#ifdef __i386__

# define _fpstate _fpstate_32

#else

# define _fpstate _fpstate_64

#endif

struct _header {

	__u64				xfeatures;

	__u64				reserved1[2];

	__u64				reserved2[5];

};

struct _ymmh_state {

	/* 16x YMM registers, 16 bytes each: */

	__u32				ymmh_space[64];

};

/*

 * Extended state pointed to by sigcontext::fpstate.

 *

 * In addition to the fpstate, information encoded in _xstate::xstate_hdr

 * indicates the presence of other extended state information supported

 * by the CPU and kernel:

 */

struct _xstate {

	struct _fpstate			fpstate;

	struct _header			xstate_hdr;

	struct _ymmh_state		ymmh;

	/* New processor state extensions go here: */

};

/*

 * The 32-bit signal frame:

 */

struct sigcontext_32 {

	__u16				gs, __gsh;

	__u16				fs, __fsh;

	__u16				es, __esh;

	__u16				ds, __dsh;

	__u32				di;

	__u32				si;

	__u32				bp;

	__u32				sp;

	__u32				bx;

	__u32				dx;

	__u32				cx;

	__u32				ax;

	__u32				trapno;

	__u32				err;

	__u32				ip;

	__u16				cs, __csh;

	__u32				flags;

	__u32				sp_at_signal;

	__u16				ss, __ssh;

	/*

	 * fpstate is really (struct _fpstate *) or (struct _xstate *)

	 * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved

	 * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end

	 * of extended memory layout. See comments at the definition of

	 * (struct _fpx_sw_bytes)

	 */

	__u32				fpstate; /* Zero when no FPU/extended context */

	__u32				oldmask;

	__u32				cr2;

};

/*

 * The 64-bit signal frame:

 */

struct sigcontext_64 {

	__u64				r8;

	__u64				r9;

	__u64				r10;

	__u64				r11;

	__u64				r12;

	__u64				r13;

	__u64				r14;

	__u64				r15;

	__u64				di;

	__u64				si;

	__u64				bp;

	__u64				bx;

	__u64				dx;

	__u64				ax;

	__u64				cx;

	__u64				sp;

	__u64				ip;

	__u64				flags;

	__u16				cs;

	__u16				gs;

	__u16				fs;

	__u16				__pad0;

	__u64				err;

	__u64				trapno;

	__u64				oldmask;

	__u64				cr2;

	/*

	 * fpstate is really (struct _fpstate *) or (struct _xstate *)

	 * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved

	 * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end

	 * of extended memory layout. See comments at the definition of

	 * (struct _fpx_sw_bytes)

	 */

	__u64				fpstate; /* Zero when no FPU/extended context */

	__u64				reserved1[8];

};

/*

 * Create the real 'struct sigcontext' type:

 */

#ifdef __KERNEL__

# ifdef __i386__

#  define sigcontext sigcontext_32

# else

#  define sigcontext sigcontext_64

# endif

#endif

/*

 * The old user-space sigcontext definition, just in case user-space still

 * relies on it. The kernel definition (in asm/sigcontext.h) has unified

 * field names but otherwise the same layout.

 */

#ifndef __KERNEL__

#define _fpstate_ia32			_fpstate_32

#define sigcontext_ia32			sigcontext_32

# ifdef __i386__

struct sigcontext {

	__u16				gs, __gsh;

	__u16				fs, __fsh;

	__u16				es, __esh;

	__u16				ds, __dsh;

	__u32				edi;

	__u32				esi;

	__u32				ebp;

	__u32				esp;

	__u32				ebx;

	__u32				edx;

	__u32				ecx;

	__u32				eax;

	__u32				trapno;

	__u32				err;

	__u32				eip;

	__u16				cs, __csh;

	__u32				eflags;

	__u32				esp_at_signal;

	__u16				ss, __ssh;

	struct _fpstate __user		*fpstate;

	__u32				oldmask;

	__u32				cr2;

};

# else /* __x86_64__: */

struct sigcontext {

	__u64				r8;

	__u64				r9;

	__u64				r10;

	__u64				r11;

	__u64				r12;

	__u64				r13;

	__u64				r14;

	__u64				r15;

	__u64				rdi;

	__u64				rsi;

	__u64				rbp;

	__u64				rbx;

	__u64				rdx;

	__u64				rax;

	__u64				rcx;

	__u64				rsp;

	__u64				rip;

	__u64				eflags;		/* RFLAGS */

	__u16				cs;

	__u16				gs;

	__u16				fs;

	__u16				__pad0;

	__u64				err;

	__u64				trapno;

	__u64				oldmask;

	__u64				cr2;

	struct _fpstate __user		*fpstate;	/* Zero when no FPU context */

#  ifdef __ILP32__

	__u32				__fpstate_pad;

#  endif

	__u64				reserved1[8];

};

# endif /* __x86_64__ */

#endif /* !__KERNEL__ */

#endif /* _UAPI_ASM_X86_SIGCONTEXT_H */