From 047a4818094217a1323d8f31f9318ea2e142f745 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 26 Jul 2010 14:37:47 +0300 Subject: [PATCH] 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 Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/emulate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 61139e20b899..b1e3e8c2aff5 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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 @@ done_prefixes: } /* Unrecognised? */ - if (c->d == 0) { + if (c->d == 0 || (c->d & Undefined)) { DPRINTF("Cannot emulate %02x\n", c->b); return -1; } -- 2.20.1