Add np and similar prefixes to instructions that should have them

This adds "np" to a bunch of SSE-style instructions that should have
it, "norep" (which was implemented but unused) on quasi-SSE instructions
that use F2 and F3 as instruction extensions but 66 for operand size,
"nof3" (newly implemented) on a few instructions, "norexw" on some
instructions that have only 32-bit and 64-bit versions, and one NOLONG.

It also removes some incorrect "np"s, changes some "f3"s to "f3i"s,
and fixes the decoding of the XCHG/NOP/PAUSE mess: F390 is always
PAUSE even when rex.b=1 (at least according to XED).

Signed-off-by: Ben Rudiak-Gould <benrudiak@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Ben Rudiak-Gould 2013-02-20 23:25:54 +04:00 committed by Cyrill Gorcunov
parent 71ba1f0e7b
commit d7ab1f9638
4 changed files with 71 additions and 56 deletions

View File

@ -118,6 +118,8 @@
* \323 - indicates fixed 64-bit operand size, REX on extensions only.
* \324 - indicates 64-bit operand size requiring REX prefix.
* \325 - instruction which always uses spl/bpl/sil/dil
* \326 - instruction not valid with 0xF3 REP prefix. Hint for
disassembler only; for SSE instructions.
* \330 - a literal byte follows in the code stream, to be added
* to the condition code value of the instruction.
* \331 - instruction not valid with REP prefix. Hint for
@ -1061,6 +1063,9 @@ static int64_t calcsize(int32_t segment, int64_t offset, int bits,
ins->rex |= REX_NH;
break;
case 0326:
break;
case 0330:
codes++, length++;
break;
@ -1709,6 +1714,9 @@ static void gencode(int32_t segment, int64_t offset, int bits,
case 0325:
break;
case 0326:
break;
case 0330:
*bytes = *codes++ ^ condval[ins->condition];
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);

View File

@ -819,6 +819,11 @@ static int matches(const struct itemplate *t, uint8_t *data,
break;
}
case 0326:
if (prefix->rep == 0xF3)
return false;
break;
case 0331:
if (prefix->rep)
return false;

112
insns.dat
View File

@ -178,18 +178,18 @@ BB0_RESET void [ 0f 3a] PENT,CYRIX,ND
BB1_RESET void [ 0f 3b] PENT,CYRIX,ND
BOUND reg16,mem [rm: o16 62 /r] 186,NOLONG
BOUND reg32,mem [rm: o32 62 /r] 386,NOLONG
BSF reg16,mem [rm: o16 0f bc /r] 386,SM
BSF reg16,reg16 [rm: o16 0f bc /r] 386
BSF reg32,mem [rm: o32 0f bc /r] 386,SM
BSF reg32,reg32 [rm: o32 0f bc /r] 386
BSF reg64,mem [rm: o64 0f bc /r] X64,SM
BSF reg64,reg64 [rm: o64 0f bc /r] X64
BSR reg16,mem [rm: o16 0f bd /r] 386,SM
BSR reg16,reg16 [rm: o16 0f bd /r] 386
BSR reg32,mem [rm: o32 0f bd /r] 386,SM
BSR reg32,reg32 [rm: o32 0f bd /r] 386
BSR reg64,mem [rm: o64 0f bd /r] X64,SM
BSR reg64,reg64 [rm: o64 0f bd /r] X64
BSF reg16,mem [rm: o16 nof3 0f bc /r] 386,SM
BSF reg16,reg16 [rm: o16 nof3 0f bc /r] 386
BSF reg32,mem [rm: o32 nof3 0f bc /r] 386,SM
BSF reg32,reg32 [rm: o32 nof3 0f bc /r] 386
BSF reg64,mem [rm: o64 nof3 0f bc /r] X64,SM
BSF reg64,reg64 [rm: o64 nof3 0f bc /r] X64
BSR reg16,mem [rm: o16 nof3 0f bd /r] 386,SM
BSR reg16,reg16 [rm: o16 nof3 0f bd /r] 386
BSR reg32,mem [rm: o32 nof3 0f bd /r] 386,SM
BSR reg32,reg32 [rm: o32 nof3 0f bd /r] 386
BSR reg64,mem [rm: o64 nof3 0f bd /r] X64,SM
BSR reg64,reg64 [rm: o64 nof3 0f bd /r] X64
BSWAP reg32 [r: o32 0f c8+r] 486
BSWAP reg64 [r: o64 0f c8+r] X64
BT mem,reg16 [mr: o16 0f a3 /r] 386,SM
@ -320,7 +320,7 @@ CMPXCHG486 mem,reg16 [mr: o16 0f a7 /r] 486,SM,UNDOC,ND,LOCK
CMPXCHG486 reg16,reg16 [mr: o16 0f a7 /r] 486,UNDOC,ND
CMPXCHG486 mem,reg32 [mr: o32 0f a7 /r] 486,SM,UNDOC,ND,LOCK
CMPXCHG486 reg32,reg32 [mr: o32 0f a7 /r] 486,UNDOC,ND
CMPXCHG8B mem [m: hle 0f c7 /1] PENT,LOCK
CMPXCHG8B mem [m: hle norexw 0f c7 /1] PENT,LOCK
CMPXCHG16B mem [m: o64 0f c7 /1] X64,LOCK
CPUID void [ 0f a2] PENT
CPU_READ void [ 0f 3d] PENT,CYRIX
@ -715,7 +715,7 @@ LEA reg64,mem [rm: o64 8d /r] X64
LEAVE void [ c9] 186
LES reg16,mem [rm: o16 c4 /r] 8086,NOLONG
LES reg32,mem [rm: o32 c4 /r] 386,NOLONG
LFENCE void [ 0f ae e8] X64,AMD
LFENCE void [ np 0f ae e8] X64,AMD
LFS reg16,mem [rm: o16 0f b4 /r] 386
LFS reg32,mem [rm: o32 0f b4 /r] 386
LFS reg64,mem [rm: o64 0f b4 /r] X64
@ -774,9 +774,9 @@ LSS reg64,mem [rm: o64 0f b2 /r] X64
LTR mem [m: 0f 00 /3] 286,PROT,PRIV
LTR mem16 [m: 0f 00 /3] 286,PROT,PRIV
LTR reg16 [m: 0f 00 /3] 286,PROT,PRIV
MFENCE void [ 0f ae f0] X64,AMD
MFENCE void [ np 0f ae f0] X64,AMD
MONITOR void [ 0f 01 c8] PRESCOTT
MONITOR reg_eax,reg_ecx,reg_edx [---: 0f 01 c8] PRESCOTT,ND
MONITOR reg_eax,reg_ecx,reg_edx [---: 0f 01 c8] PRESCOTT,NOLONG,ND
MONITOR reg_rax,reg_ecx,reg_edx [---: 0f 01 c8] X64,ND
MOV mem,reg_sreg [mr: 8c /r] 8086,SW
MOV reg16,reg_sreg [mr: o16 8c /r] 8086
@ -874,7 +874,7 @@ NEG rm8 [m: hle f6 /3] 8086,LOCK
NEG rm16 [m: hle o16 f7 /3] 8086,LOCK
NEG rm32 [m: hle o32 f7 /3] 386,LOCK
NEG rm64 [m: hle o64 f7 /3] X64,LOCK
NOP void [ norexb 90] 8086
NOP void [ norexb nof3 90] 8086
NOP rm16 [m: o16 0f 1f /0] P6
NOP rm32 [m: o32 0f 1f /0] P6
NOP rm64 [m: o64 0f 1f /0] X64
@ -938,7 +938,7 @@ PADDUSW mmxreg,mmxrm [rm: np o64nw 0f dd /r] PENT,MMX,SQ
PADDW mmxreg,mmxrm [rm: np o64nw 0f fd /r] PENT,MMX,SQ
PAND mmxreg,mmxrm [rm: np o64nw 0f db /r] PENT,MMX,SQ
PANDN mmxreg,mmxrm [rm: np o64nw 0f df /r] PENT,MMX,SQ
PAUSE void [ norexb f3i 90] 8086
PAUSE void [ f3i 90] 8086
PAVEB mmxreg,mmxrm [rm: o64nw 0f 50 /r] PENT,MMX,SQ,CYRIX
PAVGUSB mmxreg,mmxrm [rm: o64nw 0f 0f /r bf] PENT,3DNOW,SQ
PCMPEQB mmxreg,mmxrm [rm: np o64nw 0f 74 /r] PENT,MMX,SQ
@ -1177,7 +1177,7 @@ SCASB void [ repe ae] 8086
SCASD void [ repe o32 af] 386
SCASQ void [ repe o64 af] X64
SCASW void [ repe o16 af] 8086
SFENCE void [ 0f ae f8] X64,AMD
SFENCE void [ np 0f ae f8] X64,AMD
SGDT mem [m: 0f 01 /0] 286
SHL rm8,unity [m-: d0 /4] 8086
SHL rm8,reg_cl [m-: d2 /4] 8086
@ -1480,7 +1480,7 @@ CVTTSS2SI reg32,xmmrm [rm: f3 0f 2c /r] KATMAI,SSE,SD,AR1
CVTTSS2SI reg64,xmmrm [rm: o64 f3 0f 2c /r] X64,SSE,SD,AR1
DIVPS xmmreg,xmmrm128 [rm: np 0f 5e /r] KATMAI,SSE
DIVSS xmmreg,xmmrm32 [rm: f3 0f 5e /r] KATMAI,SSE
LDMXCSR mem32 [m: 0f ae /2] KATMAI,SSE
LDMXCSR mem32 [m: np 0f ae /2] KATMAI,SSE
MAXPS xmmreg,xmmrm128 [rm: np 0f 5f /r] KATMAI,SSE
MAXSS xmmreg,xmmrm32 [rm: f3 0f 5f /r] KATMAI,SSE
MINPS xmmreg,xmmrm128 [rm: np 0f 5d /r] KATMAI,SSE
@ -1511,7 +1511,7 @@ RSQRTSS xmmreg,xmmrm32 [rm: f3 0f 52 /r] KATMAI,SSE
SHUFPS xmmreg,xmmrm128,imm8 [rmi: np 0f c6 /r ib,u] KATMAI,SSE
SQRTPS xmmreg,xmmrm128 [rm: np 0f 51 /r] KATMAI,SSE
SQRTSS xmmreg,xmmrm32 [rm: f3 0f 51 /r] KATMAI,SSE
STMXCSR mem32 [m: 0f ae /3] KATMAI,SSE
STMXCSR mem32 [m: np 0f ae /3] KATMAI,SSE
SUBPS xmmreg,xmmrm128 [rm: np 0f 5c /r] KATMAI,SSE
SUBSS xmmreg,xmmrm32 [rm: f3 0f 5c /r] KATMAI,SSE
UCOMISS xmmreg,xmmrm32 [rm: np 0f 2e /r] KATMAI,SSE
@ -1520,22 +1520,22 @@ UNPCKLPS xmmreg,xmmrm128 [rm: np 0f 14 /r] KATMAI,SSE
XORPS xmmreg,xmmrm128 [rm: np 0f 57 /r] KATMAI,SSE
;# Introduced in Deschutes but necessary for SSE support
FXRSTOR mem [m: 0f ae /1] P6,SSE,FPU
FXRSTOR64 mem [m: o64 0f ae /1] X64,SSE,FPU
FXSAVE mem [m: 0f ae /0] P6,SSE,FPU
FXSAVE64 mem [m: o64 0f ae /0] X64,SSE,FPU
FXRSTOR mem [m: np 0f ae /1] P6,SSE,FPU
FXRSTOR64 mem [m: o64 np 0f ae /1] X64,SSE,FPU
FXSAVE mem [m: np 0f ae /0] P6,SSE,FPU
FXSAVE64 mem [m: o64 np 0f ae /0] X64,SSE,FPU
;# XSAVE group (AVX and extended state)
; Introduced in late Penryn ... we really need to clean up the handling
; of CPU feature bits.
XGETBV void [ np 0f 01 d0] NEHALEM
XSETBV void [ np 0f 01 d1] NEHALEM,PRIV
XSAVE mem [m: 0f ae /4] NEHALEM
XSAVE64 mem [m: o64 0f ae /4] LONG,NEHALEM
XSAVEOPT mem [m: 0f ae /6] FUTURE
XSAVEOPT64 mem [m: o64 0f ae /6] LONG,FUTURE
XRSTOR mem [m: 0f ae /5] NEHALEM
XRSTOR64 mem [m: o64 0f ae /5] LONG,NEHALEM
XGETBV void [ 0f 01 d0] NEHALEM
XSETBV void [ 0f 01 d1] NEHALEM,PRIV
XSAVE mem [m: np 0f ae /4] NEHALEM
XSAVE64 mem [m: o64 np 0f ae /4] LONG,NEHALEM
XSAVEOPT mem [m: np 0f ae /6] FUTURE
XSAVEOPT64 mem [m: o64 np 0f ae /6] LONG,FUTURE
XRSTOR mem [m: np 0f ae /5] NEHALEM
XRSTOR64 mem [m: o64 np 0f ae /5] LONG,NEHALEM
; These instructions are not SSE-specific; they are
;# Generic memory operations
@ -1544,7 +1544,7 @@ PREFETCHNTA mem [m: 0f 18 /0] KATMAI
PREFETCHT0 mem [m: 0f 18 /1] KATMAI
PREFETCHT1 mem [m: 0f 18 /2] KATMAI
PREFETCHT2 mem [m: 0f 18 /3] KATMAI
SFENCE void [ 0f ae f8] KATMAI
SFENCE void [ np 0f ae f8] KATMAI
;# New MMX instructions introduced in Katmai
MASKMOVQ mmxreg,mmxreg [rm: np 0f f7 /r] KATMAI,MMX
@ -1576,13 +1576,13 @@ PSWAPD mmxreg,mmxrm [rm: o64nw 0f 0f /r bb] PENT,3DNOW,SQ
;# Willamette SSE2 Cacheability Instructions
MASKMOVDQU xmmreg,xmmreg [rm: 66 0f f7 /r] WILLAMETTE,SSE2
; CLFLUSH needs its own feature flag implemented one day
CLFLUSH mem [m: 0f ae /7] WILLAMETTE,SSE2
CLFLUSH mem [m: np 0f ae /7] WILLAMETTE,SSE2
MOVNTDQ mem,xmmreg [mr: 66 0f e7 /r] WILLAMETTE,SSE2,SO
MOVNTI mem,reg32 [mr: np 0f c3 /r] WILLAMETTE,SD
MOVNTI mem,reg64 [mr: o64 np 0f c3 /r] X64,SQ
MOVNTPD mem,xmmreg [mr: 66 0f 2b /r] WILLAMETTE,SSE2,SO
LFENCE void [ 0f ae e8] WILLAMETTE,SSE2
MFENCE void [ 0f ae f0] WILLAMETTE,SSE2
LFENCE void [ np 0f ae e8] WILLAMETTE,SSE2
MFENCE void [ np 0f ae f0] WILLAMETTE,SSE2
;# Willamette MMX instructions (SSE2 SIMD Integer Instructions)
MOVD mem,xmmreg [mr: 66 norexw 0f 7e /r] WILLAMETTE,SSE2,SD
@ -1722,20 +1722,20 @@ CVTPD2PS xmmreg,xmmrm [rm: 66 0f 5a /r] WILLAMETTE,SSE2,SO
CVTPI2PD xmmreg,mmxrm [rm: 66 0f 2a /r] WILLAMETTE,SSE2,SQ
CVTPS2DQ xmmreg,xmmrm [rm: 66 0f 5b /r] WILLAMETTE,SSE2,SO
CVTPS2PD xmmreg,xmmrm [rm: np 0f 5a /r] WILLAMETTE,SSE2,SQ
CVTSD2SI reg32,xmmreg [rm: f2 0f 2d /r] WILLAMETTE,SSE2,SQ,AR1
CVTSD2SI reg32,mem [rm: f2 0f 2d /r] WILLAMETTE,SSE2,SQ,AR1
CVTSD2SI reg32,xmmreg [rm: norexw f2 0f 2d /r] WILLAMETTE,SSE2,SQ,AR1
CVTSD2SI reg32,mem [rm: norexw f2 0f 2d /r] WILLAMETTE,SSE2,SQ,AR1
CVTSD2SI reg64,xmmreg [rm: o64 f2 0f 2d /r] X64,SSE2,SQ,AR1
CVTSD2SI reg64,mem [rm: o64 f2 0f 2d /r] X64,SSE2,SQ,AR1
CVTSD2SS xmmreg,xmmrm [rm: f2 0f 5a /r] WILLAMETTE,SSE2,SQ
CVTSI2SD xmmreg,mem [rm: f2 0f 2a /r] WILLAMETTE,SSE2,SD,AR1,ND
CVTSI2SD xmmreg,rm32 [rm: f2 0f 2a /r] WILLAMETTE,SSE2,SD,AR1
CVTSI2SD xmmreg,rm32 [rm: norexw f2 0f 2a /r] WILLAMETTE,SSE2,SD,AR1
CVTSI2SD xmmreg,rm64 [rm: o64 f2 0f 2a /r] X64,SSE2,SQ,AR1
CVTSS2SD xmmreg,xmmrm [rm: f3 0f 5a /r] WILLAMETTE,SSE2,SD
CVTTPD2PI mmxreg,xmmrm [rm: 66 0f 2c /r] WILLAMETTE,SSE2,SO
CVTTPD2DQ xmmreg,xmmrm [rm: 66 0f e6 /r] WILLAMETTE,SSE2,SO
CVTTPS2DQ xmmreg,xmmrm [rm: f3 0f 5b /r] WILLAMETTE,SSE2,SO
CVTTSD2SI reg32,xmmreg [rm: f2 0f 2c /r] WILLAMETTE,SSE2,SQ,AR1
CVTTSD2SI reg32,mem [rm: f2 0f 2c /r] WILLAMETTE,SSE2,SQ,AR1
CVTTSD2SI reg32,xmmreg [rm: norexw f2 0f 2c /r] WILLAMETTE,SSE2,SQ,AR1
CVTTSD2SI reg32,mem [rm: norexw f2 0f 2c /r] WILLAMETTE,SSE2,SQ,AR1
CVTTSD2SI reg64,xmmreg [rm: o64 f2 0f 2c /r] X64,SSE2,SQ,AR1
CVTTSD2SI reg64,mem [rm: o64 f2 0f 2c /r] X64,SSE2,SQ,AR1
DIVPD xmmreg,xmmrm [rm: 66 0f 5e /r] WILLAMETTE,SSE2,SO
@ -1795,8 +1795,8 @@ VMFUNC void [ 0f 01 d4] VMX
VMLAUNCH void [ 0f 01 c2] VMX
VMLOAD void [ 0f 01 da] X64,VMX
VMMCALL void [ 0f 01 d9] X64,VMX
VMPTRLD mem [m: 0f c7 /6] VMX
VMPTRST mem [m: 0f c7 /7] VMX
VMPTRLD mem [m: np 0f c7 /6] VMX
VMPTRST mem [m: np 0f c7 /7] VMX
VMREAD rm32,reg32 [mr: np 0f 78 /r] VMX,NOLONG,SD
VMREAD rm64,reg64 [mr: o64nw np 0f 78 /r] X64,VMX,SQ
VMRESUME void [ 0f 01 c3] VMX
@ -1878,7 +1878,7 @@ PCMPEQQ xmmreg,xmmrm [rm: 66 0f 38 29 /r] SSE41
PEXTRB reg32,xmmreg,imm [mri: 66 0f 3a 14 /r ib,u] SSE41
PEXTRB mem8,xmmreg,imm [mri: 66 0f 3a 14 /r ib,u] SSE41
PEXTRB reg64,xmmreg,imm [mri: o64 66 0f 3a 14 /r ib,u] SSE41,X64
PEXTRD rm32,xmmreg,imm [mri: 66 0f 3a 16 /r ib,u] SSE41
PEXTRD rm32,xmmreg,imm [mri: norexw 66 0f 3a 16 /r ib,u] SSE41
PEXTRQ rm64,xmmreg,imm [mri: o64 66 0f 3a 16 /r ib,u] SSE41,X64
PEXTRW reg32,xmmreg,imm [mri: 66 0f 3a 15 /r ib,u] SSE41
PEXTRW mem16,xmmreg,imm [mri: 66 0f 3a 15 /r ib,u] SSE41
@ -1887,8 +1887,8 @@ PHMINPOSUW xmmreg,xmmrm [rm: 66 0f 38 41 /r] SSE41
PINSRB xmmreg,mem,imm [rmi: 66 0f 3a 20 /r ib,u] SSE41,SB,AR2
PINSRB xmmreg,rm8,imm [rmi: nohi 66 0f 3a 20 /r ib,u] SSE41,SB,AR2
PINSRB xmmreg,reg32,imm [rmi: 66 0f 3a 20 /r ib,u] SSE41,SB,AR2
PINSRD xmmreg,mem,imm [rmi: 66 0f 3a 22 /r ib,u] SSE41,SB,AR2
PINSRD xmmreg,rm32,imm [rmi: 66 0f 3a 22 /r ib,u] SSE41,SB,AR2
PINSRD xmmreg,mem,imm [rmi: norexw 66 0f 3a 22 /r ib,u] SSE41,SB,AR2
PINSRD xmmreg,rm32,imm [rmi: norexw 66 0f 3a 22 /r ib,u] SSE41,SB,AR2
PINSRQ xmmreg,mem,imm [rmi: o64 66 0f 3a 22 /r ib,u] SSE41,X64,SB,AR2
PINSRQ xmmreg,rm64,imm [rmi: o64 66 0f 3a 22 /r ib,u] SSE41,X64,SB,AR2
PMAXSB xmmreg,xmmrm [rm: 66 0f 38 3c /r] SSE41
@ -1943,12 +1943,12 @@ PFRSQRTV mmxreg,mmxrm [rm: o64nw 0f 0f /r 87] PENT,3DNOW,SQ,CYRIX
;# Intel new instructions in ???
; Is NEHALEM right here?
MOVBE reg16,mem16 [rm: o16 0f 38 f0 /r] NEHALEM,SM
MOVBE reg32,mem32 [rm: o32 0f 38 f0 /r] NEHALEM,SM
MOVBE reg64,mem64 [rm: o64 0f 38 f0 /r] NEHALEM,SM
MOVBE mem16,reg16 [mr: o16 0f 38 f1 /r] NEHALEM,SM
MOVBE mem32,reg32 [mr: o32 0f 38 f1 /r] NEHALEM,SM
MOVBE mem64,reg64 [mr: o64 0f 38 f1 /r] NEHALEM,SM
MOVBE reg16,mem16 [rm: o16 norep 0f 38 f0 /r] NEHALEM,SM
MOVBE reg32,mem32 [rm: o32 norep 0f 38 f0 /r] NEHALEM,SM
MOVBE reg64,mem64 [rm: o64 norep 0f 38 f0 /r] NEHALEM,SM
MOVBE mem16,reg16 [mr: o16 norep 0f 38 f1 /r] NEHALEM,SM
MOVBE mem32,reg32 [mr: o32 norep 0f 38 f1 /r] NEHALEM,SM
MOVBE mem64,reg64 [mr: o64 norep 0f 38 f1 /r] NEHALEM,SM
;# Intel AES instructions
AESENC xmmreg,xmmrm128 [rm: 66 0f 38 dc /r] SSE,WESTMERE
@ -3356,9 +3356,9 @@ XTEST void [ 0f 01 d6] FUTURE,HLE,RTM
;
; based on pub number 319433-011 dated July 2011
;
TZCNT reg16,rm16 [rm: o16 f3 0f bc /r] FUTURE,BMI1
TZCNT reg32,rm32 [rm: o32 f3 0f bc /r] FUTURE,BMI1
TZCNT reg64,rm64 [rm: o64 f3 0f bc /r] LONG,FUTURE,BMI1
TZCNT reg16,rm16 [rm: o16 f3i 0f bc /r] FUTURE,BMI1
TZCNT reg32,rm32 [rm: o32 f3i 0f bc /r] FUTURE,BMI1
TZCNT reg64,rm64 [rm: o64 f3i 0f bc /r] LONG,FUTURE,BMI1
ANDN reg32,reg32,rm32 [rvm: vex.nds.lz.0f38.w0 f2 /r] FUTURE,BMI1
ANDN reg64,reg64,rm64 [rvm: vex.nds.lz.0f38.w1 f2 /r] LONG,FUTURE,BMI1
BEXTR reg32,rm32,reg32 [rmv: vex.nds.lz.0f38.w0 f7 /r] FUTURE,BMI1

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@ -721,6 +721,8 @@ sub byte_code_compile($$) {
'norexw' => 0317,
'repe' => 0335,
'nohi' => 0325, # Use spl/bpl/sil/dil even without REX
'nof3' => 0326, # No REP 0xF3 prefix permitted
'norep' => 0331, # No REP prefix permitted
'wait' => 0341, # Needs a wait prefix
'resb' => 0340,
'jcc8' => 0370, # Match only if Jcc possible with single byte