[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [V12 1/4] x86/xsaves: using named operand instead numbered operand in xrstor
From: Shuai Ruan <shuai.ruan@xxxxxxxxx> This is pre-req patch for latter xsaves patch. This patch introduce a macro to handle restor fixup, also use named opreand instead of numbered operand in restor fixup code. Signed-off-by: Shuai Ruan <shuai.ruan@xxxxxxxxx> --- xen/arch/x86/xstate.c | 43 +++++++++++++++++++------------------------ 1 file changed, 19 insertions(+), 24 deletions(-) diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c index 827e0e1..bb6d5e11 100644 --- a/xen/arch/x86/xstate.c +++ b/xen/arch/x86/xstate.c @@ -158,6 +158,16 @@ void xsave(struct vcpu *v, uint64_t mask) ptr->fpu_sse.x[FPU_WORD_SIZE_OFFSET] = word_size; } +#define XRSTOR_FIXUP ".section .fixup,\"ax\" \n" \ + "2: mov %[size],%%ecx \n" \ + " xor %[lmask_out],%[lmask_out] \n" \ + " rep stosb \n" \ + " lea %[mem],%[ptr] \n" \ + " mov %[lmask_in],%[lmask_out] \n" \ + " jmp 1b \n" \ + ".previous \n" \ + _ASM_EXTABLE(1b, 2b) + void xrstor(struct vcpu *v, uint64_t mask) { uint32_t hmask = mask >> 32; @@ -188,38 +198,23 @@ void xrstor(struct vcpu *v, uint64_t mask) { default: asm volatile ( "1: .byte 0x48,0x0f,0xae,0x2f\n" - ".section .fixup,\"ax\" \n" - "2: mov %5,%%ecx \n" - " xor %1,%1 \n" - " rep stosb \n" - " lea %2,%0 \n" - " mov %3,%1 \n" - " jmp 1b \n" - ".previous \n" - _ASM_EXTABLE(1b, 2b) - : "+&D" (ptr), "+&a" (lmask) - : "m" (*ptr), "g" (lmask), "d" (hmask), - "m" (xsave_cntxt_size) + XRSTOR_FIXUP + : [ptr] "+&D" (ptr), [lmask_out] "+&a" (lmask) + : [mem] "m" (*ptr), [lmask_in] "g" (lmask), + [hmask] "d" (hmask), [size] "m" (xsave_cntxt_size) : "ecx" ); break; case 4: case 2: asm volatile ( "1: .byte 0x0f,0xae,0x2f\n" - ".section .fixup,\"ax\" \n" - "2: mov %5,%%ecx \n" - " xor %1,%1 \n" - " rep stosb \n" - " lea %2,%0 \n" - " mov %3,%1 \n" - " jmp 1b \n" - ".previous \n" - _ASM_EXTABLE(1b, 2b) - : "+&D" (ptr), "+&a" (lmask) - : "m" (*ptr), "g" (lmask), "d" (hmask), - "m" (xsave_cntxt_size) + XRSTOR_FIXUP + : [ptr] "+&D" (ptr), [lmask_out] "+&a" (lmask) + : [mem] "m" (*ptr), [lmask_in] "g" (lmask), + [hmask] "d" (hmask), [size] "m" (xsave_cntxt_size) : "ecx" ); break; } } +#undef XRSTOR_FIXUP bool_t xsave_enabled(const struct vcpu *v) { -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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