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Commit 42deec6f authored by Suresh Siddha's avatar Suresh Siddha Committed by Ingo Molnar
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x86, xsave: update xsave header bits during ptrace fpregs set 



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: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c37b5efe

arch/x86/kernel/i387.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -214,6 +214,13 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset, 
	 */

	 */

	target->thread.xstate->fxsave.mxcsr &= mxcsr_feature_mask;

	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;

	return ret;

}

}
@@ -414,6 +421,12 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset, 
	if (!ret)

	if (!ret)

		convert_to_fxsr(target, &env);

		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;

	return ret;

}

}