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x86, xsave: save/restore the extended state context in sigframe

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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>
This commit is contained in:
Suresh Siddha
2008-07-29 10:29:25 -07:00
committed by Ingo Molnar
parent bdd8caba5e
commit c37b5efea4
8 changed files with 264 additions and 22 deletions
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6
include/asm-x86/ucontext.h
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@@ -1,6 +1,12 @@
#ifndef ASM_X86__UCONTEXT_H
#define ASM_X86__UCONTEXT_H
#define UC_FP_XSTATE 0x1 /* indicates the presence of extended state
* information in the memory layout pointed
* by the fpstate pointer in the ucontext's
* sigcontext struct (uc_mcontext).
*/
struct ucontext {
unsigned long uc_flags;
struct ucontext *uc_link;