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Commit ce7faab2 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Avi Kivity
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KVM: x86 emulator: Use opcode::execute for BT family 



BT : 0F A3
BTS: 0F AB
BTR: 0F B3
BTC: 0F BB

Group 8: 0F BA

Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent d7841a4b

arch/x86/kvm/emulate.c

+38 −39
Original line number Diff line number Diff line
@@ -2813,6 +2813,35 @@ static int em_sti(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

}



static int em_bt(struct x86_emulate_ctxt *ctxt)

{

	/* Disable writeback. */

	ctxt->dst.type = OP_NONE;

	/* only subword offset */

	ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;



	emulate_2op_SrcV_nobyte(ctxt, "bt");

	return X86EMUL_CONTINUE;

}



static int em_bts(struct x86_emulate_ctxt *ctxt)

{

	emulate_2op_SrcV_nobyte(ctxt, "bts");

	return X86EMUL_CONTINUE;

}



static int em_btr(struct x86_emulate_ctxt *ctxt)

{

	emulate_2op_SrcV_nobyte(ctxt, "btr");

	return X86EMUL_CONTINUE;

}



static int em_btc(struct x86_emulate_ctxt *ctxt)

{

	emulate_2op_SrcV_nobyte(ctxt, "btc");

	return X86EMUL_CONTINUE;

}



static bool valid_cr(int nr)

{

	switch (nr) {
@@ -3117,10 +3146,10 @@ static struct group_dual group7 = { { 


static struct opcode group8[] = {

	N, N, N, N,

	D(DstMem | SrcImmByte | ModRM),

	D(DstMem | SrcImmByte | ModRM | Lock | PageTable),

	D(DstMem | SrcImmByte | ModRM | Lock),

	D(DstMem | SrcImmByte | ModRM | Lock | PageTable),

	I(DstMem | SrcImmByte | ModRM, em_bt),

	I(DstMem | SrcImmByte | ModRM | Lock | PageTable, em_bts),

	I(DstMem | SrcImmByte | ModRM | Lock, em_btr),

	I(DstMem | SrcImmByte | ModRM | Lock | PageTable, em_btc),

};



static struct group_dual group9 = { {
@@ -3299,26 +3328,27 @@ static struct opcode twobyte_table[256] = { 
	X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),

	/* 0xA0 - 0xA7 */

	I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),

	DI(ImplicitOps, cpuid), D(DstMem | SrcReg | ModRM | BitOp),

	DI(ImplicitOps, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt),

	D(DstMem | SrcReg | Src2ImmByte | ModRM),

	D(DstMem | SrcReg | Src2CL | ModRM), N, N,

	/* 0xA8 - 0xAF */

	I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg),

	DI(ImplicitOps, rsm),

	D(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable),

	I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts),

	D(DstMem | SrcReg | Src2ImmByte | ModRM),

	D(DstMem | SrcReg | Src2CL | ModRM),

	D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),

	/* 0xB0 - 0xB7 */

	D2bv(DstMem | SrcReg | ModRM | Lock | PageTable),

	I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),

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

	I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),

	I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),

	I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg),

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

	/* 0xB8 - 0xBF */

	N, N,

	G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable),

	G(BitOp, group8),

	I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),

	D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),

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

	/* 0xC0 - 0xCF */
@@ -4103,21 +4133,10 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) 
	case 0x90 ... 0x9f:     /* setcc r/m8 */

		ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);

		break;

	case 0xa3:

	      bt:		/* bt */

		ctxt->dst.type = OP_NONE;

		/* only subword offset */

		ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;

		emulate_2op_SrcV_nobyte(ctxt, "bt");

		break;

	case 0xa4: /* shld imm8, r, r/m */

	case 0xa5: /* shld cl, r, r/m */

		emulate_2op_cl(ctxt, "shld");

		break;

	case 0xab:

	      bts:		/* bts */

		emulate_2op_SrcV_nobyte(ctxt, "bts");

		break;

	case 0xac: /* shrd imm8, r, r/m */

	case 0xad: /* shrd cl, r, r/m */

		emulate_2op_cl(ctxt, "shrd");
@@ -4141,31 +4160,11 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) 
			ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX];

		}

		break;

	case 0xb3:

	      btr:		/* btr */

		emulate_2op_SrcV_nobyte(ctxt, "btr");

		break;

	case 0xb6 ... 0xb7:	/* movzx */

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

		ctxt->dst.val = (ctxt->d & ByteOp) ? (u8) ctxt->src.val

						       : (u16) ctxt->src.val;

		break;

	case 0xba:		/* Grp8 */

		switch (ctxt->modrm_reg & 3) {

		case 0:

			goto bt;

		case 1:

			goto bts;

		case 2:

			goto btr;

		case 3:

			goto btc;

		}

		break;

	case 0xbb:

	      btc:		/* btc */

		emulate_2op_SrcV_nobyte(ctxt, "btc");

		break;

	case 0xbc: {		/* bsf */

		u8 zf;

		__asm__ ("bsf %2, %0; setz %1"