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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: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-07-26 14:37:47 +03:00
parent 2ce495365f
commit 047a481809
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/emulate.c
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@ -84,6 +84,7 @@
#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */ #define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
#define GroupMask 0x0f /* Group number stored in bits 0:3 */ #define GroupMask 0x0f /* Group number stored in bits 0:3 */
/* Misc flags */ /* Misc flags */
#define Undefined (1<<25) /* No Such Instruction */
#define Lock (1<<26) /* lock prefix is allowed for the instruction */ #define Lock (1<<26) /* lock prefix is allowed for the instruction */
#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */ #define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
#define No64 (1<<28) #define No64 (1<<28)
@ -1065,7 +1066,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
} }
/* Unrecognised? */ /* Unrecognised? */
if (c->d == 0) { if (c->d == 0 || (c->d & Undefined)) {
DPRINTF("Cannot emulate %02x\n", c->b); DPRINTF("Cannot emulate %02x\n", c->b);
return -1; return -1;
} }