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On cpu's supporting xsave/xrstor, fpstate pointer in the sigcontext, will include the extended state information along with fpstate information. Presence of extended state information is indicated by the presence of FP_XSTATE_MAGIC1 at fpstate.sw_reserved.magic1 and FP_XSTATE_MAGIC2 at fpstate + (fpstate.sw_reserved.extended_size - FP_XSTATE_MAGIC2_SIZE). Extended feature bit mask that is saved in the memory layout is represented by the fpstate.sw_reserved.xstate_bv For RT signal frames, UC_FP_XSTATE in the uc_flags also indicate the presence of extended state information in the sigcontext's fpstate pointer. 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>
18 lines
493 B
C
18 lines
493 B
C
#ifndef ASM_X86__UCONTEXT_H
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#define ASM_X86__UCONTEXT_H
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#define UC_FP_XSTATE 0x1 /* indicates the presence of extended state
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* information in the memory layout pointed
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* by the fpstate pointer in the ucontext's
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* sigcontext struct (uc_mcontext).
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*/
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struct ucontext {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask; /* mask last for extensibility */
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};
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#endif /* ASM_X86__UCONTEXT_H */
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