x86/cpu: Use XGETBV and XSETBV mnemonics in fpu/internal.h (86109813) · Commits · 戴 / test

Current minimum required version of binutils is 2.23, which supports XGETBV and XSETBV instruction mnemonics. Replace the byte-wise specification of XGETBV and XSETBV with these proper mnemonics. Signed-off-by:

Uros Bizjak <ubizjak@gmail.com> Signed-off-by:

Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200707174722.58651-1-ubizjak@gmail.com

arch/x86/include/asm/fpu/internal.h

+2 −5

Original line number	Diff line number	Diff line
		@@ -602,9 +602,7 @@ static inline u64 xgetbv(u32 index)
		{
		u32 eax, edx;

		asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
		: "=a" (eax), "=d" (edx)
		: "c" (index));
		asm volatile("xgetbv" : "=a" (eax), "=d" (edx) : "c" (index));
		return eax + ((u64)edx << 32);
		}

		@@ -613,8 +611,7 @@ static inline void xsetbv(u32 index, u64 value)
		u32 eax = value;
		u32 edx = value >> 32;

		asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */
		: : "a" (eax), "d" (edx), "c" (index));
		asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
		}

		#endif /* _ASM_X86_FPU_INTERNAL_H */

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