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KVM: x86 emulator: introduce Op3264 for mov cr and mov dr instructions

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The operands for these instructions are 32 bits or 64 bits, depending on
long mode, and ignoring REX prefixes, or the operand size prefix.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-01 14:46:54 +03:00
parent 1e87e3efe7
commit 7f9b4b75be
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/emulate.c
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@ -83,6 +83,7 @@
#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
/* Misc flags */
#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
#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 */
@ -2406,6 +2407,13 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt)
if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
c->op_bytes = 8;
if (c->d & Op3264) {
if (mode == X86EMUL_MODE_PROT64)
c->op_bytes = 8;
else
c->op_bytes = 4;
}
/* ModRM and SIB bytes. */
if (c->d & ModRM) {
rc = decode_modrm(ctxt, ops);