[patch 9/9] x86, xsave: update xsave header bits during ptrace fpregs set

[Suresh Siddha <suresh.b.siddha@intel.com>]

[-- Attachment #1: fix_ptrace_set_fpregs.patch --]
[-- Type: text/plain, Size: 1070 bytes --]

FP/SSE bits may be zero in the xsave header(representing the init state).
Update these bits during the ptrace fpregs set operation, to indicate the
non-init state.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---

Index: tip-0728/arch/x86/kernel/i387.c
===================================================================
--- tip-0728.orig/arch/x86/kernel/i387.c	2008-07-28 18:50:08.000000000 -0700
+++ tip-0728/arch/x86/kernel/i387.c	2008-07-28 18:51:29.000000000 -0700
@@ -214,6 +214,13 @@
 	 */
 	target->thread.xstate->fxsave.mxcsr &= mxcsr_feature_mask;
 
+	/*
+	 * update the header bits in the xsave header, indicating the
+	 * presence of FP and SSE state.
+	 */
+	if (cpu_has_xsave)
+		target->thread.xstate->xsave.xsave_hdr.xstate_bv |= XSTATE_FPSSE;
+
 	return ret;
 }
 
@@ -414,6 +421,12 @@
 	if (!ret)
 		convert_to_fxsr(target, &env);
 
+	/*
+	 * update the header bit in the xsave header, indicating the
+	 * presence of FP.
+	 */
+	if (cpu_has_xsave)
+		target->thread.xstate->xsave.xsave_hdr.xstate_bv |= XSTATE_FP;
 	return ret;
 }
 

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