Commit b84e7055 authored May 29, 2014 by Fenghua Yu Committed by H. Peter Anvin May 29, 2014

x86/xsaves: Define a macro for handling xsave/xrstor instruction fault

Define a macro to handle fault generated by xsave, xsaveopt, xsaves, xrstor,
and xrstors instructions. It is used in functions like xsave_state() etc.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-8-git-send-email-fenghua.yu@intel.com

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

parent 200b08a9

arch/x86/include/asm/xsave.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,13 @@ extern int init_fpu(struct task_struct *child);
		#define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f"
		#define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f"

		#define xstate_fault ".section .fixup,\"ax\"\n" \
		"3: movl $-1,%[err]\n" \
		" jmp 2b\n" \
		".previous\n" \
		_ASM_EXTABLE(1b, 3b) \
		: [err] "=r" (err)

		static inline int fpu_xrstor_checking(struct xsave_struct *fx)
		{
		int err;