bdd8caba5e
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. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
#ifndef ASM_X86__SIGCONTEXT32_H
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#define ASM_X86__SIGCONTEXT32_H
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/* signal context for 32bit programs. */
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#define X86_FXSR_MAGIC 0x0000
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struct _fpreg {
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unsigned short significand[4];
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unsigned short exponent;
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};
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struct _fpxreg {
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unsigned short significand[4];
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unsigned short exponent;
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unsigned short padding[3];
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};
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struct _xmmreg {
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__u32 element[4];
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};
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/* FSAVE frame with extensions */
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struct _fpstate_ia32 {
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/* Regular FPU environment */
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__u32 cw;
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__u32 sw;
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__u32 tag; /* not compatible to 64bit twd */
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__u32 ipoff;
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__u32 cssel;
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__u32 dataoff;
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__u32 datasel;
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struct _fpreg _st[8];
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unsigned short status;
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unsigned short magic; /* 0xffff = regular FPU data only */
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/* FXSR FPU environment */
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__u32 _fxsr_env[6];
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__u32 mxcsr;
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__u32 reserved;
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struct _fpxreg _fxsr_st[8];
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struct _xmmreg _xmm[8]; /* It's actually 16 */
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__u32 padding[44];
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union {
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__u32 padding2[12];
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struct _fpx_sw_bytes sw_reserved;
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};
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};
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struct sigcontext_ia32 {
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unsigned short gs, __gsh;
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unsigned short fs, __fsh;
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned int di;
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unsigned int si;
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unsigned int bp;
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unsigned int sp;
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unsigned int bx;
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unsigned int dx;
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unsigned int cx;
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unsigned int ax;
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unsigned int trapno;
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unsigned int err;
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unsigned int ip;
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unsigned short cs, __csh;
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unsigned int flags;
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unsigned int sp_at_signal;
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unsigned short ss, __ssh;
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unsigned int fpstate; /* really (struct _fpstate_ia32 *) */
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unsigned int oldmask;
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unsigned int cr2;
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};
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#endif /* ASM_X86__SIGCONTEXT32_H */
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