• Suresh Siddha's avatar
    x86, ptrace: regset extensions to support xstate · 5b3efd50
    Suresh Siddha authored
    Add the xstate regset support which helps extend the kernel ptrace and the
    core-dump interfaces to support AVX state etc.
    
    This regset interface is designed to support all the future state that gets
    supported using xsave/xrstor infrastructure.
    
    Looking at the memory layout saved by "xsave", one can't say which state
    is represented in the memory layout. This is because if a particular state is
    in init state, in the xsave hdr it can be represented by bit '0'. And hence
    we can't really say by the xsave header wether a state is in init state or
    the state is not saved in the memory layout.
    
    And hence the xsave memory layout available through this regset
    interface uses SW usable bytes [464..511] to convey what state is represented
    in the memory layout.
    
    First 8 bytes of the sw_usable_bytes[464..467] will be set to OS enabled xstate
    mask(which is same as the 64bit mask returned by the xgetbv's xCR0).
    
    The note NT_X86_XSTATE represents the extended state information in the
    core file, using the above mentioned memory layout.
    Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
    LKML-Reference: <20100211195614.802495327@sbs-t61.sc.intel.com>
    Signed-off-by: default avatarHongjiu Lu <hjl.tools@gmail.com>
    Cc: Roland McGrath <roland@redhat.com>
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
    5b3efd50
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