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Commit d06e03ad authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Avi Kivity
Browse files

KVM: x86 emulator: Use opcode::execute for LOOP/JCXZ 



  LOOP/LOOPcc      : E0-E2
  JCXZ/JECXZ/JRCXZ : E3

Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 5c5df76b

arch/x86/kvm/emulate.c

+24 −11
Original line number Diff line number Diff line
@@ -2824,6 +2824,28 @@ static int em_lmsw(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

}



static int em_loop(struct x86_emulate_ctxt *ctxt)

{

	struct decode_cache *c = &ctxt->decode;



	register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);

	if ((address_mask(c, c->regs[VCPU_REGS_RCX]) != 0) &&

	    (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))

		jmp_rel(c, c->src.val);



	return X86EMUL_CONTINUE;

}



static int em_jcxz(struct x86_emulate_ctxt *ctxt)

{

	struct decode_cache *c = &ctxt->decode;



	if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)

		jmp_rel(c, c->src.val);



	return X86EMUL_CONTINUE;

}



static bool valid_cr(int nr)

{

	switch (nr) {
@@ -3240,7 +3262,8 @@ static struct opcode opcode_table[256] = { 
	/* 0xD8 - 0xDF */

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

	/* 0xE0 - 0xE7 */

	X4(D(SrcImmByte)),

	X3(I(SrcImmByte, em_loop)),

	I(SrcImmByte, em_jcxz),

	D2bvIP(SrcImmUByte | DstAcc, in,  check_perm_in),

	D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out),

	/* 0xE8 - 0xEF */
@@ -3978,16 +4001,6 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) 
		c->src.val = c->regs[VCPU_REGS_RCX];

		rc = em_grp2(ctxt);

		break;

	case 0xe0 ... 0xe2:	/* loop/loopz/loopnz */

		register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);

		if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 &&

		    (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))

			jmp_rel(c, c->src.val);

		break;

	case 0xe3:	/* jcxz/jecxz/jrcxz */

		if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)

			jmp_rel(c, c->src.val);

		break;

	case 0xe4: 	/* inb */

	case 0xe5: 	/* in */

		goto do_io_in;