blob: 16dc4e8a2cd34845042445915f9e9d74d90546c6 [file] [log] [blame]
#include <linux/compiler.h>
#include <linux/types.h>
#define FP_XSTATE_MAGIC1 0x46505853U
#define FP_XSTATE_MAGIC2 0x46505845U
* 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 <>, 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;
__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 */