On 01/08/2012 10:47 AM, Nadav Amit wrote: > On Sun, Jan 8, 2012 at 3:26 AM, Takuya Yoshikawa > <takuya.yoshikawa@xxxxxxxxx> wrote: > > Hi, > > > > Nadav Amit <nadav.amit@xxxxxxxxx> wrote: > >> On Jan 7, 2012, at 10:25 PM, H. Peter Anvin wrote: > >> > >> > On 01/07/2012 12:21 PM, Nadav Amit wrote: > >> >> MOV immediate instruction (opcodes 0xB8-0xBF) may take 64-bit operand. > >> >> The previous emulation implementation assumes the operand is no longer than 32. > >> >> > >> >> Signed-off-by: Nadav Amit <nadav.amit@xxxxxxxxx> > >> > > >> > There are exactly two such instructions: MOV immediate (B8-BF) and MOV > >> > moff (A0-A3); you may want to check the latter too. > >> > > >> > -hpa > >> > > >> > >> These instructions (A0-A3) seem to be already covered by the decode_abs function. > > > > Like these how about introducing a new flag and change the following entries in the > > decode table to indicate possible 64bit immediate: > > > > /* 0xB8 - 0xBF */ > > X8(I(DstReg | SrcImm | Mov, em_mov)), > > > > Checking the opcode byte at the operand decoding stage, like below, does not look nice: > > (IMO so better ask Avi) > > > > + if (size == 8 && ((ctxt->b & 0xF8) != 0xB8 || ctxt->twobyte)) > > size = 4; > > > > I agree. I remembered these flags are expensive (from the time flags > were set in u32). > I guess I can add OpImm64. > Another less preferable alternative is to add a misc. flag or reuse > another flag. > > Avi, please acknowledge adding OpImm64. Yes, OpImm64 is the cleanest IMO. Note it doesn't even cost us a bit. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
