Commit 92f738a5 authored by Wei Yongjun's avatar Wei Yongjun Committed by Avi Kivity
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KVM: x86 emulator: add XADD instruction emulation 



Add XADD instruction emulation (opcode 0x0f 0xc0~0xc1)

Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 31be40b3

arch/x86/kvm/emulate.c

+8 −1
Original line number Diff line number Diff line
@@ -2385,7 +2385,8 @@ static struct opcode twobyte_table[256] = { 
	D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),

	D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),

	/* 0xC0 - 0xCF */

	N, N, N, D(DstMem | SrcReg | ModRM | Mov),

	D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),

	N, D(DstMem | SrcReg | ModRM | Mov),

	N, N, N, GD(0, &group9),

	N, N, N, N, N, N, N, N,

	/* 0xD0 - 0xDF */
@@ -3531,6 +3532,12 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt) 
		c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :

							(s16) c->src.val;

		break;

	case 0xc0 ... 0xc1:	/* xadd */

		emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);

		/* Write back the register source. */

		c->src.val = c->dst.orig_val;

		write_register_operand(&c->src);

		break;

	case 0xc3:		/* movnti */

		c->dst.bytes = c->op_bytes;

		c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :