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Commit ea79849d authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: x86 emulator: Implement jmp far opcode ff/5 



Implement jmp far opcode ff/5. It is used by multiboot loader.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e35b7b9c

arch/x86/kvm/emulate.c

+9 −2
Original line number Diff line number Diff line
@@ -346,7 +346,8 @@ static u32 group_table[] = { 
	[Group5*8] =

	DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,

	SrcMem | ModRM | Stack, 0,

	SrcMem | ModRM | Stack, 0, SrcMem | ModRM | Stack, 0,

	SrcMem | ModRM | Stack, SrcMem | ModRM | Src2Mem16 | ImplicitOps,

	SrcMem | ModRM | Stack, 0,

	[Group7*8] =

	0, 0, ModRM | SrcMem | Priv, ModRM | SrcMem | Priv,

	SrcNone | ModRM | DstMem | Mov, 0,
@@ -2322,6 +2323,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
	case 0xe9: /* jmp rel */

		goto jmp;

	case 0xea: /* jmp far */

	jump_far:

		if (kvm_load_segment_descriptor(ctxt->vcpu, c->src2.val,

						VCPU_SREG_CS))

			goto done;
@@ -2397,11 +2399,16 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
		ctxt->eflags |= EFLG_DF;

		c->dst.type = OP_NONE;	/* Disable writeback. */

		break;

	case 0xfe ... 0xff:	/* Grp4/Grp5 */

	case 0xfe: /* Grp4 */

	grp45:

		rc = emulate_grp45(ctxt, ops);

		if (rc != X86EMUL_CONTINUE)

			goto done;

		break;

	case 0xff: /* Grp5 */

		if (c->modrm_reg == 5)

			goto jump_far;

		goto grp45;

	}



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