--- /dev/null
+#ifndef _UAPI_ASM_X86_SIGCONTEXT_H
+#define _UAPI_ASM_X86_SIGCONTEXT_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#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 512byte layout of fxsave/fxrstor frame
+ * are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
+ * are used to extended the fpstate pointer in the sigcontext, which now
+ * includes the extended state information along with fpstate information.
+ *
+ * Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
+ * area and FP_XSTATE_MAGIC2 at the end of memory layout
+ * (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
+ * extended state information in the memory layout pointed by the fpstate
+ * pointer in sigcontext.
+ */
+struct _fpx_sw_bytes {
+ __u32 magic1; /* FP_XSTATE_MAGIC1 */
+ __u32 extended_size; /* total size of the layout referred by
+ * fpstate pointer in the sigcontext.
+ */
+ __u64 xstate_bv;
+ /* feature bit mask (including fp/sse/extended
+ * state) that is present in the memory
+ * layout.
+ */
+ __u32 xstate_size; /* actual xsave state size, based on the
+ * features saved in the layout.
+ * 'extended_size' will be greater than
+ * 'xstate_size'.
+ */
+ __u32 padding[7]; /* for future use. */
+};
+
+#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 padding1[44];
+
+ union {
+ unsigned long padding2[12];
+ struct _fpx_sw_bytes sw_reserved; /* represents the extended
+ * state info */
+ };
+};
+
+#define X86_FXSR_MAGIC 0x0000
+
+#ifndef __KERNEL__
+/*
+ * User-space might still rely on the old definition:
+ */
+struct sigcontext {
+ unsigned short gs, __gsh;
+ unsigned short fs, __fsh;
+ unsigned short es, __esh;
+ unsigned short ds, __dsh;
+ unsigned long edi;
+ unsigned long esi;
+ unsigned long ebp;
+ unsigned long esp;
+ unsigned long ebx;
+ unsigned long edx;
+ unsigned long ecx;
+ unsigned long eax;
+ unsigned long trapno;
+ unsigned long err;
+ unsigned long eip;
+ unsigned short cs, __csh;
+ unsigned long eflags;
+ unsigned long esp_at_signal;
+ unsigned short ss, __ssh;
+ struct _fpstate __user *fpstate;
+ unsigned long oldmask;
+ unsigned long cr2;
+};
+#endif /* !__KERNEL__ */
+
+#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[12];
+ union {
+ __u32 reserved3[12];
+ struct _fpx_sw_bytes sw_reserved; /* represents the extended
+ * state information */
+ };
+};
+
+#ifndef __KERNEL__
+/*
+ * User-space might still rely on the old definition:
+ */
+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;
+
+ /*
+ * Prior to 2.5.64 ("[PATCH] x86-64 updates for 2.5.64-bk3"),
+ * Linux saved and restored fs and gs in these slots. This
+ * was counterproductive, as fsbase and gsbase were never
+ * saved, so arch_prctl was presumably unreliable.
+ *
+ * If these slots are ever needed for any other purpose, there
+ * is some risk that very old 64-bit binaries could get
+ * confused. I doubt that many such binaries still work,
+ * though, since the same patch in 2.5.64 also removed the
+ * 64-bit set_thread_area syscall, so it appears that there is
+ * no TLS API that works in both pre- and post-2.5.64 kernels.
+ */
+ __u16 __pad2; /* Was gs. */
+ __u16 __pad1; /* Was fs. */
+
+ __u16 ss;
+ __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 /* !__KERNEL__ */
+
+#endif /* !__i386__ */
+
+struct _xsave_hdr {
+ __u64 xstate_bv;
+ __u64 reserved1[2];
+ __u64 reserved2[5];
+};
+
+struct _ymmh_state {
+ /* 16 * 16 bytes for each YMMH-reg */
+ __u32 ymmh_space[64];
+};
+
+/*
+ * Extended state pointed by the fpstate pointer in the sigcontext.
+ * In addition to the fpstate, information encoded in the xstate_hdr
+ * indicates the presence of other extended state information
+ * supported by the processor and OS.
+ */
+struct _xstate {
+ struct _fpstate fpstate;
+ struct _xsave_hdr xstate_hdr;
+ struct _ymmh_state ymmh;
+ /* new processor state extensions go here */
+};
+
+#endif /* _UAPI_ASM_X86_SIGCONTEXT_H */
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