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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-10-07 14:04:28 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-10-07 14:36:08 -0700
commit04944b793e18ece23f63c0252646b310c1845940 (patch)
treec8a99e14a910aedcd7147d5ccf2e63be5b26ca0a /arch/arm/mach-at91/clock.c
parentf364eadab59b316ea0bd9f9bc01af0ad89065569 (diff)
x86: xsave: set FP, SSE bits in the xsave header in the user sigcontext
If a processor implementation discern that a processor state component is in its initialized state, it may modify the corresponding bit in the xsave header.xstate_bv as '0'. State in the memory layout setup by 'xsave' will be consistent with the bit values in the header. During signal handling, legacy applications may change the FP/SSE bits in the sigcontext memory layout without touching the FP/SSE header bits in the xsave header. So always set FP/SSE bits in the xsave header while saving the sigcontext state to the user space. During signal return, this will enable the kernel to capture any changes to the FP/SSE bits by the legacy applications which don't touch xsave headers. xsave aware apps can change the xstate_bv in the xsave header aswell as change any contents in the memory layout. xrestor as part of sigreturn will capture all the changes. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/arm/mach-at91/clock.c')
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