Commit 047a4818 authored by Avi Kivity's avatar Avi Kivity
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KVM: x86 emulator: add Undefined decode flag 



Add a decode flag to indicate the instruction is invalid.  Will come in useful
later, when we mix decode bits from the opcode and group table.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 2ce49536

arch/x86/kvm/emulate.c

+2 −1
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ 
#define GroupDual   (1<<15)     /* Alternate decoding of mod == 3 */

#define GroupMask   0x0f        /* Group number stored in bits 0:3 */

/* Misc flags */

#define Undefined   (1<<25) /* No Such Instruction */

#define Lock        (1<<26) /* lock prefix is allowed for the instruction */

#define Priv        (1<<27) /* instruction generates #GP if current CPL != 0 */

#define No64	    (1<<28)
@@ -1065,7 +1066,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
	}



	/* Unrecognised? */

	if (c->d == 0) {

	if (c->d == 0 || (c->d & Undefined)) {

		DPRINTF("Cannot emulate %02x\n", c->b);

		return -1;

	}