linux/include/asm-x86/sigcontext.h

#ifndef _ASM_X86_SIGCONTEXT_H
#define _ASM_X86_SIGCONTEXT_H

#include <linux/compiler.h>
#include <asm/types.h>

#ifdef __i386__
/*
 * 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.
 *
 * Pentium III FXSR, SSE support
 *	Gareth Hughes <gareth@valinux.com>, May 2000
 *
 * 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.
 */
struct _fpreg {
	unsigned short significand[4];
	unsigned short exponent;
};

struct _fpxreg {
	unsigned short significand[4];
	unsigned short exponent;
	unsigned short padding[3];
};

struct _xmmreg {
	unsigned long element[4];
};

struct _fpstate {
	/* Regular FPU environment */
	unsigned long	cw;
	unsigned long	sw;
	unsigned long	tag;
	unsigned long	ipoff;
	unsigned long	cssel;
	unsigned long	dataoff;
	unsigned long	datasel;
	struct _fpreg	_st[8];
	unsigned short	status;
	unsigned short	magic;		/* 0xffff = regular FPU data only */

	/* FXSR FPU environment */
	unsigned long	_fxsr_env[6];	/* FXSR FPU env is ignored */
	unsigned long	mxcsr;
	unsigned long	reserved;
	struct _fpxreg	_fxsr_st[8];	/* FXSR FPU reg data is ignored */
	struct _xmmreg	_xmm[8];
	unsigned long	padding[56];
};

#define X86_FXSR_MAGIC		0x0000

struct sigcontext {
	unsigned short gs, __gsh;
	unsigned short fs, __fsh;
	unsigned short es, __esh;
	unsigned short ds, __dsh;
	unsigned long di;
	unsigned long si;
	unsigned long bp;
	unsigned long sp;
	unsigned long bx;
	unsigned long dx;
	unsigned long cx;
	unsigned long ax;
	unsigned long trapno;
	unsigned long err;
	unsigned long ip;
	unsigned short cs, __csh;
	unsigned long flags;
	unsigned long sp_at_signal;
	unsigned short ss, __ssh;
	struct _fpstate __user * fpstate;
	unsigned long oldmask;
	unsigned long cr2;
};

#else /* __i386__ */

/* FXSAVE frame */
/* Note: reserved1/2 may someday contain valuable data. Always save/restore
   them when you change signal frames. */
struct _fpstate {
	__u16	cwd;
	__u16	swd;
	__u16	twd;	/* Note this is not the same as the 32bit/x87/FSAVE twd */
	__u16	fop;
	__u64	rip;
	__u64	rdp;
	__u32	mxcsr;
	__u32	mxcsr_mask;
	__u32	st_space[32];	/* 8*16 bytes for each FP-reg */
	__u32	xmm_space[64];	/* 16*16 bytes for each XMM-reg  */
	__u32	reserved2[24];
};

struct sigcontext {
	unsigned long r8;
	unsigned long r9;
	unsigned long r10;
	unsigned long r11;
	unsigned long r12;
	unsigned long r13;
	unsigned long r14;
	unsigned long r15;
	unsigned long di;
	unsigned long si;
	unsigned long bp;
	unsigned long bx;
	unsigned long dx;
	unsigned long ax;
	unsigned long cx;
	unsigned long sp;
	unsigned long ip;
	unsigned long flags;
	unsigned short cs;
	unsigned short gs;
	unsigned short fs;
	unsigned short __pad0;
	unsigned long err;
	unsigned long trapno;
	unsigned long oldmask;
	unsigned long cr2;
	struct _fpstate __user *fpstate;	/* zero when no FPU context */
	unsigned long reserved1[8];
};

#endif /* !__i386__ */

#endif